drivers/net/vxlan.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VXLAN: Virtual eXtensible Local Area Network
   4  *
   5  * Copyright (c) 2012-2013 Vyatta Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/slab.h>
  14 #include <linux/udp.h>
  15 #include <linux/igmp.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/ethtool.h>
  18 #include <net/arp.h>
  19 #include <net/ndisc.h>
  20 #include <net/ipv6_stubs.h>
  21 #include <net/ip.h>
  22 #include <net/icmp.h>
  23 #include <net/rtnetlink.h>
  24 #include <net/inet_ecn.h>
  25 #include <net/net_namespace.h>
  26 #include <net/netns/generic.h>
  27 #include <net/tun_proto.h>
  28 #include <net/vxlan.h>
  29 #include <net/nexthop.h>
  30
  31 #if IS_ENABLED(CONFIG_IPV6)
  32 #include <net/ip6_tunnel.h>
  33 #include <net/ip6_checksum.h>
  34 #endif
  35
  36 #define VXLAN_VERSION   "0.1"
  37
  38 #define PORT_HASH_BITS  8
  39 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  40 #define FDB_AGE_DEFAULT 300 /* 5 min */
  41 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  42
  43 /* UDP port for VXLAN traffic.
  44  * The IANA assigned port is 4789, but the Linux default is 8472
  45  * for compatibility with early adopters.
  46  */
  47 static unsigned short vxlan_port __read_mostly = 8472;
  48 module_param_named(udp_port, vxlan_port, ushort, 0444);
  49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  50
  51 static bool log_ecn_error = true;
  52 module_param(log_ecn_error, bool, 0644);
  53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  54
  55 static unsigned int vxlan_net_id;
  56 static struct rtnl_link_ops vxlan_link_ops;
  57
  58 static const u8 all_zeros_mac[ETH_ALEN + 2];
  59
  60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  61
  62 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  63
  64 /* per-network namespace private data for this module */
  65 struct vxlan_net {
  66         struct list_head  vxlan_list;
  67         struct hlist_head sock_list[PORT_HASH_SIZE];
  68         spinlock_t        sock_lock;
  69 };
  70
  71 /* Forwarding table entry */
  72 struct vxlan_fdb {
  73         struct hlist_node hlist;        /* linked list of entries */
  74         struct rcu_head   rcu;
  75         unsigned long     updated;      /* jiffies */
  76         unsigned long     used;
  77         struct list_head  remotes;
  78         u8                eth_addr[ETH_ALEN];
  79         u16               state;        /* see ndm_state */
  80         __be32            vni;
  81         u16               flags;        /* see ndm_flags and below */
  82         struct list_head  nh_list;
  83         struct nexthop __rcu *nh;
  84         struct vxlan_dev  __rcu *vdev;
  85 };
  86
  87 #define NTF_VXLAN_ADDED_BY_USER 0x100
  88
  89 /* salt for hash table */
  90 static u32 vxlan_salt __read_mostly;
  91
  92 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  93 {
  94         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  95                ip_tunnel_collect_metadata();
  96 }
  97
  98 #if IS_ENABLED(CONFIG_IPV6)
  99 static inline
 100 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 101 {
 102         if (a->sa.sa_family != b->sa.sa_family)
 103                 return false;
 104         if (a->sa.sa_family == AF_INET6)
 105                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 106         else
 107                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 108 }
 109
 110 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 111 {
 112         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 113                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 114                 ip->sa.sa_family = AF_INET6;
 115                 return 0;
 116         } else if (nla_len(nla) >= sizeof(__be32)) {
 117                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 118                 ip->sa.sa_family = AF_INET;
 119                 return 0;
 120         } else {
 121                 return -EAFNOSUPPORT;
 122         }
 123 }
 124
 125 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 126                               const union vxlan_addr *ip)
 127 {
 128         if (ip->sa.sa_family == AF_INET6)
 129                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 130         else
 131                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 132 }
 133
 134 #else /* !CONFIG_IPV6 */
 135
 136 static inline
 137 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 138 {
 139         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 140 }
 141
 142 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 143 {
 144         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 145                 return -EAFNOSUPPORT;
 146         } else if (nla_len(nla) >= sizeof(__be32)) {
 147                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 148                 ip->sa.sa_family = AF_INET;
 149                 return 0;
 150         } else {
 151                 return -EAFNOSUPPORT;
 152         }
 153 }
 154
 155 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 156                               const union vxlan_addr *ip)
 157 {
 158         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 159 }
 160 #endif
 161
 162 /* Virtual Network hash table head */
 163 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 164 {
 165         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 166 }
 167
 168 /* Socket hash table head */
 169 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 170 {
 171         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 172
 173         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 174 }
 175
 176 /* First remote destination for a forwarding entry.
 177  * Guaranteed to be non-NULL because remotes are never deleted.
 178  */
 179 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 180 {
 181         if (rcu_access_pointer(fdb->nh))
 182                 return NULL;
 183         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 184 }
 185
 186 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 187 {
 188         if (rcu_access_pointer(fdb->nh))
 189                 return NULL;
 190         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 191 }
 192
 193 /* Find VXLAN socket based on network namespace, address family and UDP port
 194  * and enabled unshareable flags.
 195  */
 196 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 197                                           __be16 port, u32 flags, int ifindex)
 198 {
 199         struct vxlan_sock *vs;
 200
 201         flags &= VXLAN_F_RCV_FLAGS;
 202
 203         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 204                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 205                     vxlan_get_sk_family(vs) == family &&
 206                     vs->flags == flags &&
 207                     vs->sock->sk->sk_bound_dev_if == ifindex)
 208                         return vs;
 209         }
 210         return NULL;
 211 }
 212
 213 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
 214                                            __be32 vni)
 215 {
 216         struct vxlan_dev_node *node;
 217
 218         /* For flow based devices, map all packets to VNI 0 */
 219         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 220                 vni = 0;
 221
 222         hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 223                 if (node->vxlan->default_dst.remote_vni != vni)
 224                         continue;
 225
 226                 if (IS_ENABLED(CONFIG_IPV6)) {
 227                         const struct vxlan_config *cfg = &node->vxlan->cfg;
 228
 229                         if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 230                             cfg->remote_ifindex != ifindex)
 231                                 continue;
 232                 }
 233
 234                 return node->vxlan;
 235         }
 236
 237         return NULL;
 238 }
 239
 240 /* Look up VNI in a per net namespace table */
 241 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 242                                         __be32 vni, sa_family_t family,
 243                                         __be16 port, u32 flags)
 244 {
 245         struct vxlan_sock *vs;
 246
 247         vs = vxlan_find_sock(net, family, port, flags, ifindex);
 248         if (!vs)
 249                 return NULL;
 250
 251         return vxlan_vs_find_vni(vs, ifindex, vni);
 252 }
 253
 254 /* Fill in neighbour message in skbuff. */
 255 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 256                           const struct vxlan_fdb *fdb,
 257                           u32 portid, u32 seq, int type, unsigned int flags,
 258                           const struct vxlan_rdst *rdst)
 259 {
 260         unsigned long now = jiffies;
 261         struct nda_cacheinfo ci;
 262         bool send_ip, send_eth;
 263         struct nlmsghdr *nlh;
 264         struct nexthop *nh;
 265         struct ndmsg *ndm;
 266         int nh_family;
 267         u32 nh_id;
 268
 269         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 270         if (nlh == NULL)
 271                 return -EMSGSIZE;
 272
 273         ndm = nlmsg_data(nlh);
 274         memset(ndm, 0, sizeof(*ndm));
 275
 276         send_eth = send_ip = true;
 277
 278         rcu_read_lock();
 279         nh = rcu_dereference(fdb->nh);
 280         if (nh) {
 281                 nh_family = nexthop_get_family(nh);
 282                 nh_id = nh->id;
 283         }
 284         rcu_read_unlock();
 285
 286         if (type == RTM_GETNEIGH) {
 287                 if (rdst) {
 288                         send_ip = !vxlan_addr_any(&rdst->remote_ip);
 289                         ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 290                 } else if (nh) {
 291                         ndm->ndm_family = nh_family;
 292                 }
 293                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 294         } else
 295                 ndm->ndm_family = AF_BRIDGE;
 296         ndm->ndm_state = fdb->state;
 297         ndm->ndm_ifindex = vxlan->dev->ifindex;
 298         ndm->ndm_flags = fdb->flags;
 299         if (rdst && rdst->offloaded)
 300                 ndm->ndm_flags |= NTF_OFFLOADED;
 301         ndm->ndm_type = RTN_UNICAST;
 302
 303         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 304             nla_put_s32(skb, NDA_LINK_NETNSID,
 305                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 306                 goto nla_put_failure;
 307
 308         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 309                 goto nla_put_failure;
 310         if (nh) {
 311                 if (nla_put_u32(skb, NDA_NH_ID, nh_id))
 312                         goto nla_put_failure;
 313         } else if (rdst) {
 314                 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
 315                                                   &rdst->remote_ip))
 316                         goto nla_put_failure;
 317
 318                 if (rdst->remote_port &&
 319                     rdst->remote_port != vxlan->cfg.dst_port &&
 320                     nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 321                         goto nla_put_failure;
 322                 if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 323                     nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 324                         goto nla_put_failure;
 325                 if (rdst->remote_ifindex &&
 326                     nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 327                         goto nla_put_failure;
 328         }
 329
 330         if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 331             nla_put_u32(skb, NDA_SRC_VNI,
 332                         be32_to_cpu(fdb->vni)))
 333                 goto nla_put_failure;
 334
 335         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 336         ci.ndm_confirmed = 0;
 337         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 338         ci.ndm_refcnt    = 0;
 339
 340         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 341                 goto nla_put_failure;
 342
 343         nlmsg_end(skb, nlh);
 344         return 0;
 345
 346 nla_put_failure:
 347         nlmsg_cancel(skb, nlh);
 348         return -EMSGSIZE;
 349 }
 350
 351 static inline size_t vxlan_nlmsg_size(void)
 352 {
 353         return NLMSG_ALIGN(sizeof(struct ndmsg))
 354                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 355                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 356                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 357                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 358                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 359                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 360                 + nla_total_size(sizeof(struct nda_cacheinfo));
 361 }
 362
 363 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 364                                struct vxlan_rdst *rd, int type)
 365 {
 366         struct net *net = dev_net(vxlan->dev);
 367         struct sk_buff *skb;
 368         int err = -ENOBUFS;
 369
 370         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 371         if (skb == NULL)
 372                 goto errout;
 373
 374         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 375         if (err < 0) {
 376                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 377                 WARN_ON(err == -EMSGSIZE);
 378                 kfree_skb(skb);
 379                 goto errout;
 380         }
 381
 382         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 383         return;
 384 errout:
 385         if (err < 0)
 386                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 387 }
 388
 389 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
 390                             const struct vxlan_fdb *fdb,
 391                             const struct vxlan_rdst *rd,
 392                             struct netlink_ext_ack *extack,
 393                             struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 394 {
 395         fdb_info->info.dev = vxlan->dev;
 396         fdb_info->info.extack = extack;
 397         fdb_info->remote_ip = rd->remote_ip;
 398         fdb_info->remote_port = rd->remote_port;
 399         fdb_info->remote_vni = rd->remote_vni;
 400         fdb_info->remote_ifindex = rd->remote_ifindex;
 401         memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
 402         fdb_info->vni = fdb->vni;
 403         fdb_info->offloaded = rd->offloaded;
 404         fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
 405 }
 406
 407 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
 408                                               struct vxlan_fdb *fdb,
 409                                               struct vxlan_rdst *rd,
 410                                               bool adding,
 411                                               struct netlink_ext_ack *extack)
 412 {
 413         struct switchdev_notifier_vxlan_fdb_info info;
 414         enum switchdev_notifier_type notifier_type;
 415         int ret;
 416
 417         if (WARN_ON(!rd))
 418                 return 0;
 419
 420         notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
 421                                : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
 422         vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
 423         ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
 424                                        &info.info, extack);
 425         return notifier_to_errno(ret);
 426 }
 427
 428 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 429                             struct vxlan_rdst *rd, int type, bool swdev_notify,
 430                             struct netlink_ext_ack *extack)
 431 {
 432         int err;
 433
 434         if (swdev_notify && rd) {
 435                 switch (type) {
 436                 case RTM_NEWNEIGH:
 437                         err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 438                                                                  true, extack);
 439                         if (err)
 440                                 return err;
 441                         break;
 442                 case RTM_DELNEIGH:
 443                         vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
 444                                                            false, extack);
 445                         break;
 446                 }
 447         }
 448
 449         __vxlan_fdb_notify(vxlan, fdb, rd, type);
 450         return 0;
 451 }
 452
 453 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 454 {
 455         struct vxlan_dev *vxlan = netdev_priv(dev);
 456         struct vxlan_fdb f = {
 457                 .state = NUD_STALE,
 458         };
 459         struct vxlan_rdst remote = {
 460                 .remote_ip = *ipa, /* goes to NDA_DST */
 461                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 462         };
 463
 464         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 465 }
 466
 467 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 468 {
 469         struct vxlan_fdb f = {
 470                 .state = NUD_STALE,
 471         };
 472         struct vxlan_rdst remote = { };
 473
 474         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 475
 476         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
 477 }
 478
 479 /* Hash Ethernet address */
 480 static u32 eth_hash(const unsigned char *addr)
 481 {
 482         u64 value = get_unaligned((u64 *)addr);
 483
 484         /* only want 6 bytes */
 485 #ifdef __BIG_ENDIAN
 486         value >>= 16;
 487 #else
 488         value <<= 16;
 489 #endif
 490         return hash_64(value, FDB_HASH_BITS);
 491 }
 492
 493 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 494 {
 495         /* use 1 byte of OUI and 3 bytes of NIC */
 496         u32 key = get_unaligned((u32 *)(addr + 2));
 497
 498         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 499 }
 500
 501 static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
 502 {
 503         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 504                 return eth_vni_hash(mac, vni);
 505         else
 506                 return eth_hash(mac);
 507 }
 508
 509 /* Hash chain to use given mac address */
 510 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 511                                                 const u8 *mac, __be32 vni)
 512 {
 513         return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
 514 }
 515
 516 /* Look up Ethernet address in forwarding table */
 517 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 518                                           const u8 *mac, __be32 vni)
 519 {
 520         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 521         struct vxlan_fdb *f;
 522
 523         hlist_for_each_entry_rcu(f, head, hlist) {
 524                 if (ether_addr_equal(mac, f->eth_addr)) {
 525                         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 526                                 if (vni == f->vni)
 527                                         return f;
 528                         } else {
 529                                 return f;
 530                         }
 531                 }
 532         }
 533
 534         return NULL;
 535 }
 536
 537 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 538                                         const u8 *mac, __be32 vni)
 539 {
 540         struct vxlan_fdb *f;
 541
 542         f = __vxlan_find_mac(vxlan, mac, vni);
 543         if (f && f->used != jiffies)
 544                 f->used = jiffies;
 545
 546         return f;
 547 }
 548
 549 /* caller should hold vxlan->hash_lock */
 550 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 551                                               union vxlan_addr *ip, __be16 port,
 552                                               __be32 vni, __u32 ifindex)
 553 {
 554         struct vxlan_rdst *rd;
 555
 556         list_for_each_entry(rd, &f->remotes, list) {
 557                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 558                     rd->remote_port == port &&
 559                     rd->remote_vni == vni &&
 560                     rd->remote_ifindex == ifindex)
 561                         return rd;
 562         }
 563
 564         return NULL;
 565 }
 566
 567 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
 568                       struct switchdev_notifier_vxlan_fdb_info *fdb_info)
 569 {
 570         struct vxlan_dev *vxlan = netdev_priv(dev);
 571         u8 eth_addr[ETH_ALEN + 2] = { 0 };
 572         struct vxlan_rdst *rdst;
 573         struct vxlan_fdb *f;
 574         int rc = 0;
 575
 576         if (is_multicast_ether_addr(mac) ||
 577             is_zero_ether_addr(mac))
 578                 return -EINVAL;
 579
 580         ether_addr_copy(eth_addr, mac);
 581
 582         rcu_read_lock();
 583
 584         f = __vxlan_find_mac(vxlan, eth_addr, vni);
 585         if (!f) {
 586                 rc = -ENOENT;
 587                 goto out;
 588         }
 589
 590         rdst = first_remote_rcu(f);
 591         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
 592
 593 out:
 594         rcu_read_unlock();
 595         return rc;
 596 }
 597 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
 598
 599 static int vxlan_fdb_notify_one(struct notifier_block *nb,
 600                                 const struct vxlan_dev *vxlan,
 601                                 const struct vxlan_fdb *f,
 602                                 const struct vxlan_rdst *rdst,
 603                                 struct netlink_ext_ack *extack)
 604 {
 605         struct switchdev_notifier_vxlan_fdb_info fdb_info;
 606         int rc;
 607
 608         vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
 609         rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
 610                                &fdb_info);
 611         return notifier_to_errno(rc);
 612 }
 613
 614 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
 615                      struct notifier_block *nb,
 616                      struct netlink_ext_ack *extack)
 617 {
 618         struct vxlan_dev *vxlan;
 619         struct vxlan_rdst *rdst;
 620         struct vxlan_fdb *f;
 621         unsigned int h;
 622         int rc = 0;
 623
 624         if (!netif_is_vxlan(dev))
 625                 return -EINVAL;
 626         vxlan = netdev_priv(dev);
 627
 628         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 629                 spin_lock_bh(&vxlan->hash_lock[h]);
 630                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
 631                         if (f->vni == vni) {
 632                                 list_for_each_entry(rdst, &f->remotes, list) {
 633                                         rc = vxlan_fdb_notify_one(nb, vxlan,
 634                                                                   f, rdst,
 635                                                                   extack);
 636                                         if (rc)
 637                                                 goto unlock;
 638                                 }
 639                         }
 640                 }
 641                 spin_unlock_bh(&vxlan->hash_lock[h]);
 642         }
 643         return 0;
 644
 645 unlock:
 646         spin_unlock_bh(&vxlan->hash_lock[h]);
 647         return rc;
 648 }
 649 EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
 650
 651 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
 652 {
 653         struct vxlan_dev *vxlan;
 654         struct vxlan_rdst *rdst;
 655         struct vxlan_fdb *f;
 656         unsigned int h;
 657
 658         if (!netif_is_vxlan(dev))
 659                 return;
 660         vxlan = netdev_priv(dev);
 661
 662         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 663                 spin_lock_bh(&vxlan->hash_lock[h]);
 664                 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
 665                         if (f->vni == vni)
 666                                 list_for_each_entry(rdst, &f->remotes, list)
 667                                         rdst->offloaded = false;
 668                 spin_unlock_bh(&vxlan->hash_lock[h]);
 669         }
 670
 671 }
 672 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
 673
 674 /* Replace destination of unicast mac */
 675 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 676                              union vxlan_addr *ip, __be16 port, __be32 vni,
 677                              __u32 ifindex, struct vxlan_rdst *oldrd)
 678 {
 679         struct vxlan_rdst *rd;
 680
 681         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 682         if (rd)
 683                 return 0;
 684
 685         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 686         if (!rd)
 687                 return 0;
 688
 689         *oldrd = *rd;
 690         dst_cache_reset(&rd->dst_cache);
 691         rd->remote_ip = *ip;
 692         rd->remote_port = port;
 693         rd->remote_vni = vni;
 694         rd->remote_ifindex = ifindex;
 695         rd->offloaded = false;
 696         return 1;
 697 }
 698
 699 /* Add/update destinations for multicast */
 700 static int vxlan_fdb_append(struct vxlan_fdb *f,
 701                             union vxlan_addr *ip, __be16 port, __be32 vni,
 702                             __u32 ifindex, struct vxlan_rdst **rdp)
 703 {
 704         struct vxlan_rdst *rd;
 705
 706         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 707         if (rd)
 708                 return 0;
 709
 710         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 711         if (rd == NULL)
 712                 return -ENOBUFS;
 713
 714         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 715                 kfree(rd);
 716                 return -ENOBUFS;
 717         }
 718
 719         rd->remote_ip = *ip;
 720         rd->remote_port = port;
 721         rd->offloaded = false;
 722         rd->remote_vni = vni;
 723         rd->remote_ifindex = ifindex;
 724
 725         list_add_tail_rcu(&rd->list, &f->remotes);
 726
 727         *rdp = rd;
 728         return 1;
 729 }
 730
 731 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 732                                           unsigned int off,
 733                                           struct vxlanhdr *vh, size_t hdrlen,
 734                                           __be32 vni_field,
 735                                           struct gro_remcsum *grc,
 736                                           bool nopartial)
 737 {
 738         size_t start, offset;
 739
 740         if (skb->remcsum_offload)
 741                 return vh;
 742
 743         if (!NAPI_GRO_CB(skb)->csum_valid)
 744                 return NULL;
 745
 746         start = vxlan_rco_start(vni_field);
 747         offset = start + vxlan_rco_offset(vni_field);
 748
 749         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 750                                      start, offset, grc, nopartial);
 751
 752         skb->remcsum_offload = 1;
 753
 754         return vh;
 755 }
 756
 757 static struct sk_buff *vxlan_gro_receive(struct sock *sk,
 758                                          struct list_head *head,
 759                                          struct sk_buff *skb)
 760 {
 761         struct sk_buff *pp = NULL;
 762         struct sk_buff *p;
 763         struct vxlanhdr *vh, *vh2;
 764         unsigned int hlen, off_vx;
 765         int flush = 1;
 766         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 767         __be32 flags;
 768         struct gro_remcsum grc;
 769
 770         skb_gro_remcsum_init(&grc);
 771
 772         off_vx = skb_gro_offset(skb);
 773         hlen = off_vx + sizeof(*vh);
 774         vh   = skb_gro_header_fast(skb, off_vx);
 775         if (skb_gro_header_hard(skb, hlen)) {
 776                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 777                 if (unlikely(!vh))
 778                         goto out;
 779         }
 780
 781         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 782
 783         flags = vh->vx_flags;
 784
 785         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 786                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 787                                        vh->vx_vni, &grc,
 788                                        !!(vs->flags &
 789                                           VXLAN_F_REMCSUM_NOPARTIAL));
 790
 791                 if (!vh)
 792                         goto out;
 793         }
 794
 795         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 796
 797         list_for_each_entry(p, head, list) {
 798                 if (!NAPI_GRO_CB(p)->same_flow)
 799                         continue;
 800
 801                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 802                 if (vh->vx_flags != vh2->vx_flags ||
 803                     vh->vx_vni != vh2->vx_vni) {
 804                         NAPI_GRO_CB(p)->same_flow = 0;
 805                         continue;
 806                 }
 807         }
 808
 809         pp = call_gro_receive(eth_gro_receive, head, skb);
 810         flush = 0;
 811
 812 out:
 813         skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
 814
 815         return pp;
 816 }
 817
 818 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 819 {
 820         /* Sets 'skb->inner_mac_header' since we are always called with
 821          * 'skb->encapsulation' set.
 822          */
 823         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 824 }
 825
 826 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
 827                                          __u16 state, __be32 src_vni,
 828                                          __u16 ndm_flags)
 829 {
 830         struct vxlan_fdb *f;
 831
 832         f = kmalloc(sizeof(*f), GFP_ATOMIC);
 833         if (!f)
 834                 return NULL;
 835         f->state = state;
 836         f->flags = ndm_flags;
 837         f->updated = f->used = jiffies;
 838         f->vni = src_vni;
 839         f->nh = NULL;
 840         RCU_INIT_POINTER(f->vdev, vxlan);
 841         INIT_LIST_HEAD(&f->nh_list);
 842         INIT_LIST_HEAD(&f->remotes);
 843         memcpy(f->eth_addr, mac, ETH_ALEN);
 844
 845         return f;
 846 }
 847
 848 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
 849                              __be32 src_vni, struct vxlan_fdb *f)
 850 {
 851         ++vxlan->addrcnt;
 852         hlist_add_head_rcu(&f->hlist,
 853                            vxlan_fdb_head(vxlan, mac, src_vni));
 854 }
 855
 856 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 857                                u32 nhid, struct netlink_ext_ack *extack)
 858 {
 859         struct nexthop *old_nh = rtnl_dereference(fdb->nh);
 860         struct nh_group *nhg;
 861         struct nexthop *nh;
 862         int err = -EINVAL;
 863
 864         if (old_nh && old_nh->id == nhid)
 865                 return 0;
 866
 867         nh = nexthop_find_by_id(vxlan->net, nhid);
 868         if (!nh) {
 869                 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
 870                 goto err_inval;
 871         }
 872
 873         if (nh) {
 874                 if (!nexthop_get(nh)) {
 875                         NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
 876                         nh = NULL;
 877                         goto err_inval;
 878                 }
 879                 if (!nh->is_fdb_nh) {
 880                         NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
 881                         goto err_inval;
 882                 }
 883
 884                 nhg = rtnl_dereference(nh->nh_grp);
 885                 if (!nh->is_group || !nhg->mpath) {
 886                         NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
 887                         goto err_inval;
 888                 }
 889
 890                 /* check nexthop group family */
 891                 switch (vxlan->default_dst.remote_ip.sa.sa_family) {
 892                 case AF_INET:
 893                         if (!nhg->has_v4) {
 894                                 err = -EAFNOSUPPORT;
 895                                 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 896                                 goto err_inval;
 897                         }
 898                         break;
 899                 case AF_INET6:
 900                         if (nhg->has_v4) {
 901                                 err = -EAFNOSUPPORT;
 902                                 NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
 903                                 goto err_inval;
 904                         }
 905                 }
 906         }
 907
 908         if (old_nh) {
 909                 list_del_rcu(&fdb->nh_list);
 910                 nexthop_put(old_nh);
 911         }
 912         rcu_assign_pointer(fdb->nh, nh);
 913         list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
 914         return 1;
 915
 916 err_inval:
 917         if (nh)
 918                 nexthop_put(nh);
 919         return err;
 920 }
 921
 922 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 923                             const u8 *mac, union vxlan_addr *ip,
 924                             __u16 state, __be16 port, __be32 src_vni,
 925                             __be32 vni, __u32 ifindex, __u16 ndm_flags,
 926                             u32 nhid, struct vxlan_fdb **fdb,
 927                             struct netlink_ext_ack *extack)
 928 {
 929         struct vxlan_rdst *rd = NULL;
 930         struct vxlan_fdb *f;
 931         int rc;
 932
 933         if (vxlan->cfg.addrmax &&
 934             vxlan->addrcnt >= vxlan->cfg.addrmax)
 935                 return -ENOSPC;
 936
 937         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 938         f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
 939         if (!f)
 940                 return -ENOMEM;
 941
 942         if (nhid)
 943                 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
 944         else
 945                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 946         if (rc < 0)
 947                 goto errout;
 948
 949         *fdb = f;
 950
 951         return 0;
 952
 953 errout:
 954         kfree(f);
 955         return rc;
 956 }
 957
 958 static void __vxlan_fdb_free(struct vxlan_fdb *f)
 959 {
 960         struct vxlan_rdst *rd, *nd;
 961         struct nexthop *nh;
 962
 963         nh = rcu_dereference_raw(f->nh);
 964         if (nh) {
 965                 rcu_assign_pointer(f->nh, NULL);
 966                 rcu_assign_pointer(f->vdev, NULL);
 967                 nexthop_put(nh);
 968         }
 969
 970         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 971                 dst_cache_destroy(&rd->dst_cache);
 972                 kfree(rd);
 973         }
 974         kfree(f);
 975 }
 976
 977 static void vxlan_fdb_free(struct rcu_head *head)
 978 {
 979         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 980
 981         __vxlan_fdb_free(f);
 982 }
 983
 984 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 985                               bool do_notify, bool swdev_notify)
 986 {
 987         struct vxlan_rdst *rd;
 988
 989         netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
 990
 991         --vxlan->addrcnt;
 992         if (do_notify) {
 993                 if (rcu_access_pointer(f->nh))
 994                         vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
 995                                          swdev_notify, NULL);
 996                 else
 997                         list_for_each_entry(rd, &f->remotes, list)
 998                                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
 999                                                  swdev_notify, NULL);
1000         }
1001
1002         hlist_del_rcu(&f->hlist);
1003         list_del_rcu(&f->nh_list);
1004         call_rcu(&f->rcu, vxlan_fdb_free);
1005 }
1006
1007 static void vxlan_dst_free(struct rcu_head *head)
1008 {
1009         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
1010
1011         dst_cache_destroy(&rd->dst_cache);
1012         kfree(rd);
1013 }
1014
1015 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
1016                                      union vxlan_addr *ip,
1017                                      __u16 state, __u16 flags,
1018                                      __be16 port, __be32 vni,
1019                                      __u32 ifindex, __u16 ndm_flags,
1020                                      struct vxlan_fdb *f, u32 nhid,
1021                                      bool swdev_notify,
1022                                      struct netlink_ext_ack *extack)
1023 {
1024         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1025         struct vxlan_rdst *rd = NULL;
1026         struct vxlan_rdst oldrd;
1027         int notify = 0;
1028         int rc = 0;
1029         int err;
1030
1031         if (nhid && !rcu_access_pointer(f->nh)) {
1032                 NL_SET_ERR_MSG(extack,
1033                                "Cannot replace an existing non nexthop fdb with a nexthop");
1034                 return -EOPNOTSUPP;
1035         }
1036
1037         if (nhid && (flags & NLM_F_APPEND)) {
1038                 NL_SET_ERR_MSG(extack,
1039                                "Cannot append to a nexthop fdb");
1040                 return -EOPNOTSUPP;
1041         }
1042
1043         /* Do not allow an externally learned entry to take over an entry added
1044          * by the user.
1045          */
1046         if (!(fdb_flags & NTF_EXT_LEARNED) ||
1047             !(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
1048                 if (f->state != state) {
1049                         f->state = state;
1050                         f->updated = jiffies;
1051                         notify = 1;
1052                 }
1053                 if (f->flags != fdb_flags) {
1054                         f->flags = fdb_flags;
1055                         f->updated = jiffies;
1056                         notify = 1;
1057                 }
1058         }
1059
1060         if ((flags & NLM_F_REPLACE)) {
1061                 /* Only change unicasts */
1062                 if (!(is_multicast_ether_addr(f->eth_addr) ||
1063                       is_zero_ether_addr(f->eth_addr))) {
1064                         if (nhid) {
1065                                 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
1066                                 if (rc < 0)
1067                                         return rc;
1068                         } else {
1069                                 rc = vxlan_fdb_replace(f, ip, port, vni,
1070                                                        ifindex, &oldrd);
1071                         }
1072                         notify |= rc;
1073                 } else {
1074                         NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
1075                         return -EOPNOTSUPP;
1076                 }
1077         }
1078         if ((flags & NLM_F_APPEND) &&
1079             (is_multicast_ether_addr(f->eth_addr) ||
1080              is_zero_ether_addr(f->eth_addr))) {
1081                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
1082
1083                 if (rc < 0)
1084                         return rc;
1085                 notify |= rc;
1086         }
1087
1088         if (ndm_flags & NTF_USE)
1089                 f->used = jiffies;
1090
1091         if (notify) {
1092                 if (rd == NULL)
1093                         rd = first_remote_rtnl(f);
1094
1095                 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
1096                                        swdev_notify, extack);
1097                 if (err)
1098                         goto err_notify;
1099         }
1100
1101         return 0;
1102
1103 err_notify:
1104         if (nhid)
1105                 return err;
1106         if ((flags & NLM_F_REPLACE) && rc)
1107                 *rd = oldrd;
1108         else if ((flags & NLM_F_APPEND) && rc) {
1109                 list_del_rcu(&rd->list);
1110                 call_rcu(&rd->rcu, vxlan_dst_free);
1111         }
1112         return err;
1113 }
1114
1115 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
1116                                    const u8 *mac, union vxlan_addr *ip,
1117                                    __u16 state, __u16 flags,
1118                                    __be16 port, __be32 src_vni, __be32 vni,
1119                                    __u32 ifindex, __u16 ndm_flags, u32 nhid,
1120                                    bool swdev_notify,
1121                                    struct netlink_ext_ack *extack)
1122 {
1123         __u16 fdb_flags = (ndm_flags & ~NTF_USE);
1124         struct vxlan_fdb *f;
1125         int rc;
1126
1127         /* Disallow replace to add a multicast entry */
1128         if ((flags & NLM_F_REPLACE) &&
1129             (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
1130                 return -EOPNOTSUPP;
1131
1132         netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
1133         rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
1134                               vni, ifindex, fdb_flags, nhid, &f, extack);
1135         if (rc < 0)
1136                 return rc;
1137
1138         vxlan_fdb_insert(vxlan, mac, src_vni, f);
1139         rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
1140                               swdev_notify, extack);
1141         if (rc)
1142                 goto err_notify;
1143
1144         return 0;
1145
1146 err_notify:
1147         vxlan_fdb_destroy(vxlan, f, false, false);
1148         return rc;
1149 }
1150
1151 /* Add new entry to forwarding table -- assumes lock held */
1152 static int vxlan_fdb_update(struct vxlan_dev *vxlan,
1153                             const u8 *mac, union vxlan_addr *ip,
1154                             __u16 state, __u16 flags,
1155                             __be16 port, __be32 src_vni, __be32 vni,
1156                             __u32 ifindex, __u16 ndm_flags, u32 nhid,
1157                             bool swdev_notify,
1158                             struct netlink_ext_ack *extack)
1159 {
1160         struct vxlan_fdb *f;
1161
1162         f = __vxlan_find_mac(vxlan, mac, src_vni);
1163         if (f) {
1164                 if (flags & NLM_F_EXCL) {
1165                         netdev_dbg(vxlan->dev,
1166                                    "lost race to create %pM\n", mac);
1167                         return -EEXIST;
1168                 }
1169
1170                 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
1171                                                  vni, ifindex, ndm_flags, f,
1172                                                  nhid, swdev_notify, extack);
1173         } else {
1174                 if (!(flags & NLM_F_CREATE))
1175                         return -ENOENT;
1176
1177                 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
1178                                                port, src_vni, vni, ifindex,
1179                                                ndm_flags, nhid, swdev_notify,
1180                                                extack);
1181         }
1182 }
1183
1184 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
1185                                   struct vxlan_rdst *rd, bool swdev_notify)
1186 {
1187         list_del_rcu(&rd->list);
1188         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
1189         call_rcu(&rd->rcu, vxlan_dst_free);
1190 }
1191
1192 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
1193                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
1194                            __be32 *vni, u32 *ifindex, u32 *nhid)
1195 {
1196         struct net *net = dev_net(vxlan->dev);
1197         int err;
1198
1199         if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
1200             tb[NDA_PORT]))
1201                 return -EINVAL;
1202
1203         if (tb[NDA_DST]) {
1204                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
1205                 if (err)
1206                         return err;
1207         } else {
1208                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
1209
1210                 if (remote->sa.sa_family == AF_INET) {
1211                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
1212                         ip->sa.sa_family = AF_INET;
1213 #if IS_ENABLED(CONFIG_IPV6)
1214                 } else {
1215                         ip->sin6.sin6_addr = in6addr_any;
1216                         ip->sa.sa_family = AF_INET6;
1217 #endif
1218                 }
1219         }
1220
1221         if (tb[NDA_PORT]) {
1222                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
1223                         return -EINVAL;
1224                 *port = nla_get_be16(tb[NDA_PORT]);
1225         } else {
1226                 *port = vxlan->cfg.dst_port;
1227         }
1228
1229         if (tb[NDA_VNI]) {
1230                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
1231                         return -EINVAL;
1232                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1233         } else {
1234                 *vni = vxlan->default_dst.remote_vni;
1235         }
1236
1237         if (tb[NDA_SRC_VNI]) {
1238                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
1239                         return -EINVAL;
1240                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
1241         } else {
1242                 *src_vni = vxlan->default_dst.remote_vni;
1243         }
1244
1245         if (tb[NDA_IFINDEX]) {
1246                 struct net_device *tdev;
1247
1248                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
1249                         return -EINVAL;
1250                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
1251                 tdev = __dev_get_by_index(net, *ifindex);
1252                 if (!tdev)
1253                         return -EADDRNOTAVAIL;
1254         } else {
1255                 *ifindex = 0;
1256         }
1257
1258         if (tb[NDA_NH_ID])
1259                 *nhid = nla_get_u32(tb[NDA_NH_ID]);
1260         else
1261                 *nhid = 0;
1262
1263         return 0;
1264 }
1265
1266 /* Add static entry (via netlink) */
1267 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1268                          struct net_device *dev,
1269                          const unsigned char *addr, u16 vid, u16 flags,
1270                          struct netlink_ext_ack *extack)
1271 {
1272         struct vxlan_dev *vxlan = netdev_priv(dev);
1273         /* struct net *net = dev_net(vxlan->dev); */
1274         union vxlan_addr ip;
1275         __be16 port;
1276         __be32 src_vni, vni;
1277         u32 ifindex, nhid;
1278         u32 hash_index;
1279         int err;
1280
1281         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
1282                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
1283                         ndm->ndm_state);
1284                 return -EINVAL;
1285         }
1286
1287         if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
1288                 return -EINVAL;
1289
1290         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1291                               &nhid);
1292         if (err)
1293                 return err;
1294
1295         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
1296                 return -EAFNOSUPPORT;
1297
1298         hash_index = fdb_head_index(vxlan, addr, src_vni);
1299         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1300         err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
1301                                port, src_vni, vni, ifindex,
1302                                ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
1303                                nhid, true, extack);
1304         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1305
1306         return err;
1307 }
1308
1309 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
1310                               const unsigned char *addr, union vxlan_addr ip,
1311                               __be16 port, __be32 src_vni, __be32 vni,
1312                               u32 ifindex, bool swdev_notify)
1313 {
1314         struct vxlan_rdst *rd = NULL;
1315         struct vxlan_fdb *f;
1316         int err = -ENOENT;
1317
1318         f = vxlan_find_mac(vxlan, addr, src_vni);
1319         if (!f)
1320                 return err;
1321
1322         if (!vxlan_addr_any(&ip)) {
1323                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
1324                 if (!rd)
1325                         goto out;
1326         }
1327
1328         /* remove a destination if it's not the only one on the list,
1329          * otherwise destroy the fdb entry
1330          */
1331         if (rd && !list_is_singular(&f->remotes)) {
1332                 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
1333                 goto out;
1334         }
1335
1336         vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
1337
1338 out:
1339         return 0;
1340 }
1341
1342 /* Delete entry (via netlink) */
1343 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1344                             struct net_device *dev,
1345                             const unsigned char *addr, u16 vid)
1346 {
1347         struct vxlan_dev *vxlan = netdev_priv(dev);
1348         union vxlan_addr ip;
1349         __be32 src_vni, vni;
1350         u32 ifindex, nhid;
1351         u32 hash_index;
1352         __be16 port;
1353         int err;
1354
1355         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
1356                               &nhid);
1357         if (err)
1358                 return err;
1359
1360         hash_index = fdb_head_index(vxlan, addr, src_vni);
1361         spin_lock_bh(&vxlan->hash_lock[hash_index]);
1362         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
1363                                  true);
1364         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
1365
1366         return err;
1367 }
1368
1369 /* Dump forwarding table */
1370 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1371                           struct net_device *dev,
1372                           struct net_device *filter_dev, int *idx)
1373 {
1374         struct vxlan_dev *vxlan = netdev_priv(dev);
1375         unsigned int h;
1376         int err = 0;
1377
1378         for (h = 0; h < FDB_HASH_SIZE; ++h) {
1379                 struct vxlan_fdb *f;
1380
1381                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
1382                         struct vxlan_rdst *rd;
1383
1384                         if (rcu_access_pointer(f->nh)) {
1385                                 err = vxlan_fdb_info(skb, vxlan, f,
1386                                                      NETLINK_CB(cb->skb).portid,
1387                                                      cb->nlh->nlmsg_seq,
1388                                                      RTM_NEWNEIGH,
1389                                                      NLM_F_MULTI, NULL);
1390                                 if (err < 0)
1391                                         goto out;
1392                                 continue;
1393                         }
1394
1395                         list_for_each_entry_rcu(rd, &f->remotes, list) {
1396                                 if (*idx < cb->args[2])
1397                                         goto skip;
1398
1399                                 err = vxlan_fdb_info(skb, vxlan, f,
1400                                                      NETLINK_CB(cb->skb).portid,
1401                                                      cb->nlh->nlmsg_seq,
1402                                                      RTM_NEWNEIGH,
1403                                                      NLM_F_MULTI, rd);
1404                                 if (err < 0)
1405                                         goto out;
1406 skip:
1407                                 *idx += 1;
1408                         }
1409                 }
1410         }
1411 out:
1412         return err;
1413 }
1414
1415 static int vxlan_fdb_get(struct sk_buff *skb,
1416                          struct nlattr *tb[],
1417                          struct net_device *dev,
1418                          const unsigned char *addr,
1419                          u16 vid, u32 portid, u32 seq,
1420                          struct netlink_ext_ack *extack)
1421 {
1422         struct vxlan_dev *vxlan = netdev_priv(dev);
1423         struct vxlan_fdb *f;
1424         __be32 vni;
1425         int err;
1426
1427         if (tb[NDA_VNI])
1428                 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
1429         else
1430                 vni = vxlan->default_dst.remote_vni;
1431
1432         rcu_read_lock();
1433
1434         f = __vxlan_find_mac(vxlan, addr, vni);
1435         if (!f) {
1436                 NL_SET_ERR_MSG(extack, "Fdb entry not found");
1437                 err = -ENOENT;
1438                 goto errout;
1439         }
1440
1441         err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
1442                              RTM_NEWNEIGH, 0, first_remote_rcu(f));
1443 errout:
1444         rcu_read_unlock();
1445         return err;
1446 }
1447
1448 /* Watch incoming packets to learn mapping between Ethernet address
1449  * and Tunnel endpoint.
1450  * Return true if packet is bogus and should be dropped.
1451  */
1452 static bool vxlan_snoop(struct net_device *dev,
1453                         union vxlan_addr *src_ip, const u8 *src_mac,
1454                         u32 src_ifindex, __be32 vni)
1455 {
1456         struct vxlan_dev *vxlan = netdev_priv(dev);
1457         struct vxlan_fdb *f;
1458         u32 ifindex = 0;
1459
1460 #if IS_ENABLED(CONFIG_IPV6)
1461         if (src_ip->sa.sa_family == AF_INET6 &&
1462             (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
1463                 ifindex = src_ifindex;
1464 #endif
1465
1466         f = vxlan_find_mac(vxlan, src_mac, vni);
1467         if (likely(f)) {
1468                 struct vxlan_rdst *rdst = first_remote_rcu(f);
1469
1470                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
1471                            rdst->remote_ifindex == ifindex))
1472                         return false;
1473
1474                 /* Don't migrate static entries, drop packets */
1475                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
1476                         return true;
1477
1478                 /* Don't override an fdb with nexthop with a learnt entry */
1479                 if (rcu_access_pointer(f->nh))
1480                         return true;
1481
1482                 if (net_ratelimit())
1483                         netdev_info(dev,
1484                                     "%pM migrated from %pIS to %pIS\n",
1485                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1486
1487                 rdst->remote_ip = *src_ip;
1488                 f->updated = jiffies;
1489                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
1490         } else {
1491                 u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
1492
1493                 /* learned new entry */
1494                 spin_lock(&vxlan->hash_lock[hash_index]);
1495
1496                 /* close off race between vxlan_flush and incoming packets */
1497                 if (netif_running(dev))
1498                         vxlan_fdb_update(vxlan, src_mac, src_ip,
1499                                          NUD_REACHABLE,
1500                                          NLM_F_EXCL|NLM_F_CREATE,
1501                                          vxlan->cfg.dst_port,
1502                                          vni,
1503                                          vxlan->default_dst.remote_vni,
1504                                          ifindex, NTF_SELF, 0, true, NULL);
1505                 spin_unlock(&vxlan->hash_lock[hash_index]);
1506         }
1507
1508         return false;
1509 }
1510
1511 /* See if multicast group is already in use by other ID */
1512 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1513 {
1514         struct vxlan_dev *vxlan;
1515         struct vxlan_sock *sock4;
1516 #if IS_ENABLED(CONFIG_IPV6)
1517         struct vxlan_sock *sock6;
1518 #endif
1519         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1520
1521         sock4 = rtnl_dereference(dev->vn4_sock);
1522
1523         /* The vxlan_sock is only used by dev, leaving group has
1524          * no effect on other vxlan devices.
1525          */
1526         if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1527                 return false;
1528 #if IS_ENABLED(CONFIG_IPV6)
1529         sock6 = rtnl_dereference(dev->vn6_sock);
1530         if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1531                 return false;
1532 #endif
1533
1534         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1535                 if (!netif_running(vxlan->dev) || vxlan == dev)
1536                         continue;
1537
1538                 if (family == AF_INET &&
1539                     rtnl_dereference(vxlan->vn4_sock) != sock4)
1540                         continue;
1541 #if IS_ENABLED(CONFIG_IPV6)
1542                 if (family == AF_INET6 &&
1543                     rtnl_dereference(vxlan->vn6_sock) != sock6)
1544                         continue;
1545 #endif
1546
1547                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1548                                       &dev->default_dst.remote_ip))
1549                         continue;
1550
1551                 if (vxlan->default_dst.remote_ifindex !=
1552                     dev->default_dst.remote_ifindex)
1553                         continue;
1554
1555                 return true;
1556         }
1557
1558         return false;
1559 }
1560
1561 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1562 {
1563         struct vxlan_net *vn;
1564
1565         if (!vs)
1566                 return false;
1567         if (!refcount_dec_and_test(&vs->refcnt))
1568                 return false;
1569
1570         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1571         spin_lock(&vn->sock_lock);
1572         hlist_del_rcu(&vs->hlist);
1573         udp_tunnel_notify_del_rx_port(vs->sock,
1574                                       (vs->flags & VXLAN_F_GPE) ?
1575                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1576                                       UDP_TUNNEL_TYPE_VXLAN);
1577         spin_unlock(&vn->sock_lock);
1578
1579         return true;
1580 }
1581
1582 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1583 {
1584         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1585 #if IS_ENABLED(CONFIG_IPV6)
1586         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1587
1588         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1589 #endif
1590
1591         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1592         synchronize_net();
1593
1594         vxlan_vs_del_dev(vxlan);
1595
1596         if (__vxlan_sock_release_prep(sock4)) {
1597                 udp_tunnel_sock_release(sock4->sock);
1598                 kfree(sock4);
1599         }
1600
1601 #if IS_ENABLED(CONFIG_IPV6)
1602         if (__vxlan_sock_release_prep(sock6)) {
1603                 udp_tunnel_sock_release(sock6->sock);
1604                 kfree(sock6);
1605         }
1606 #endif
1607 }
1608
1609 /* Update multicast group membership when first VNI on
1610  * multicast address is brought up
1611  */
1612 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1613 {
1614         struct sock *sk;
1615         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1616         int ifindex = vxlan->default_dst.remote_ifindex;
1617         int ret = -EINVAL;
1618
1619         if (ip->sa.sa_family == AF_INET) {
1620                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1621                 struct ip_mreqn mreq = {
1622                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1623                         .imr_ifindex            = ifindex,
1624                 };
1625
1626                 sk = sock4->sock->sk;
1627                 lock_sock(sk);
1628                 ret = ip_mc_join_group(sk, &mreq);
1629                 release_sock(sk);
1630 #if IS_ENABLED(CONFIG_IPV6)
1631         } else {
1632                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1633
1634                 sk = sock6->sock->sk;
1635                 lock_sock(sk);
1636                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1637                                                    &ip->sin6.sin6_addr);
1638                 release_sock(sk);
1639 #endif
1640         }
1641
1642         return ret;
1643 }
1644
1645 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1646 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1647 {
1648         struct sock *sk;
1649         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1650         int ifindex = vxlan->default_dst.remote_ifindex;
1651         int ret = -EINVAL;
1652
1653         if (ip->sa.sa_family == AF_INET) {
1654                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1655                 struct ip_mreqn mreq = {
1656                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1657                         .imr_ifindex            = ifindex,
1658                 };
1659
1660                 sk = sock4->sock->sk;
1661                 lock_sock(sk);
1662                 ret = ip_mc_leave_group(sk, &mreq);
1663                 release_sock(sk);
1664 #if IS_ENABLED(CONFIG_IPV6)
1665         } else {
1666                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1667
1668                 sk = sock6->sock->sk;
1669                 lock_sock(sk);
1670                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1671                                                    &ip->sin6.sin6_addr);
1672                 release_sock(sk);
1673 #endif
1674         }
1675
1676         return ret;
1677 }
1678
1679 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1680                           struct sk_buff *skb, u32 vxflags)
1681 {
1682         size_t start, offset;
1683
1684         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1685                 goto out;
1686
1687         start = vxlan_rco_start(unparsed->vx_vni);
1688         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1689
1690         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1691                 return false;
1692
1693         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1694                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1695 out:
1696         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1697         unparsed->vx_vni &= VXLAN_VNI_MASK;
1698         return true;
1699 }
1700
1701 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1702                                 struct sk_buff *skb, u32 vxflags,
1703                                 struct vxlan_metadata *md)
1704 {
1705         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1706         struct metadata_dst *tun_dst;
1707
1708         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1709                 goto out;
1710
1711         md->gbp = ntohs(gbp->policy_id);
1712
1713         tun_dst = (struct metadata_dst *)skb_dst(skb);
1714         if (tun_dst) {
1715                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1716                 tun_dst->u.tun_info.options_len = sizeof(*md);
1717         }
1718         if (gbp->dont_learn)
1719                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1720
1721         if (gbp->policy_applied)
1722                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1723
1724         /* In flow-based mode, GBP is carried in dst_metadata */
1725         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1726                 skb->mark = md->gbp;
1727 out:
1728         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1729 }
1730
1731 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1732                                 __be16 *protocol,
1733                                 struct sk_buff *skb, u32 vxflags)
1734 {
1735         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1736
1737         /* Need to have Next Protocol set for interfaces in GPE mode. */
1738         if (!gpe->np_applied)
1739                 return false;
1740         /* "The initial version is 0. If a receiver does not support the
1741          * version indicated it MUST drop the packet.
1742          */
1743         if (gpe->version != 0)
1744                 return false;
1745         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1746          * processing MUST occur." However, we don't implement OAM
1747          * processing, thus drop the packet.
1748          */
1749         if (gpe->oam_flag)
1750                 return false;
1751
1752         *protocol = tun_p_to_eth_p(gpe->next_protocol);
1753         if (!*protocol)
1754                 return false;
1755
1756         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1757         return true;
1758 }
1759
1760 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1761                           struct vxlan_sock *vs,
1762                           struct sk_buff *skb, __be32 vni)
1763 {
1764         union vxlan_addr saddr;
1765         u32 ifindex = skb->dev->ifindex;
1766
1767         skb_reset_mac_header(skb);
1768         skb->protocol = eth_type_trans(skb, vxlan->dev);
1769         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1770
1771         /* Ignore packet loops (and multicast echo) */
1772         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1773                 return false;
1774
1775         /* Get address from the outer IP header */
1776         if (vxlan_get_sk_family(vs) == AF_INET) {
1777                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1778                 saddr.sa.sa_family = AF_INET;
1779 #if IS_ENABLED(CONFIG_IPV6)
1780         } else {
1781                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1782                 saddr.sa.sa_family = AF_INET6;
1783 #endif
1784         }
1785
1786         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1787             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1788                 return false;
1789
1790         return true;
1791 }
1792
1793 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1794                                   struct sk_buff *skb)
1795 {
1796         int err = 0;
1797
1798         if (vxlan_get_sk_family(vs) == AF_INET)
1799                 err = IP_ECN_decapsulate(oiph, skb);
1800 #if IS_ENABLED(CONFIG_IPV6)
1801         else
1802                 err = IP6_ECN_decapsulate(oiph, skb);
1803 #endif
1804
1805         if (unlikely(err) && log_ecn_error) {
1806                 if (vxlan_get_sk_family(vs) == AF_INET)
1807                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1808                                              &((struct iphdr *)oiph)->saddr,
1809                                              ((struct iphdr *)oiph)->tos);
1810                 else
1811                         net_info_ratelimited("non-ECT from %pI6\n",
1812                                              &((struct ipv6hdr *)oiph)->saddr);
1813         }
1814         return err <= 1;
1815 }
1816
1817 /* Callback from net/ipv4/udp.c to receive packets */
1818 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1819 {
1820         struct pcpu_sw_netstats *stats;
1821         struct vxlan_dev *vxlan;
1822         struct vxlan_sock *vs;
1823         struct vxlanhdr unparsed;
1824         struct vxlan_metadata _md;
1825         struct vxlan_metadata *md = &_md;
1826         __be16 protocol = htons(ETH_P_TEB);
1827         bool raw_proto = false;
1828         void *oiph;
1829         __be32 vni = 0;
1830
1831         /* Need UDP and VXLAN header to be present */
1832         if (!pskb_may_pull(skb, VXLAN_HLEN))
1833                 goto drop;
1834
1835         unparsed = *vxlan_hdr(skb);
1836         /* VNI flag always required to be set */
1837         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1838                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1839                            ntohl(vxlan_hdr(skb)->vx_flags),
1840                            ntohl(vxlan_hdr(skb)->vx_vni));
1841                 /* Return non vxlan pkt */
1842                 goto drop;
1843         }
1844         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1845         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1846
1847         vs = rcu_dereference_sk_user_data(sk);
1848         if (!vs)
1849                 goto drop;
1850
1851         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1852
1853         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1854         if (!vxlan)
1855                 goto drop;
1856
1857         /* For backwards compatibility, only allow reserved fields to be
1858          * used by VXLAN extensions if explicitly requested.
1859          */
1860         if (vs->flags & VXLAN_F_GPE) {
1861                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1862                         goto drop;
1863                 raw_proto = true;
1864         }
1865
1866         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1867                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1868                 goto drop;
1869
1870         if (vxlan_collect_metadata(vs)) {
1871                 struct metadata_dst *tun_dst;
1872
1873                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1874                                          key32_to_tunnel_id(vni), sizeof(*md));
1875
1876                 if (!tun_dst)
1877                         goto drop;
1878
1879                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1880
1881                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1882         } else {
1883                 memset(md, 0, sizeof(*md));
1884         }
1885
1886         if (vs->flags & VXLAN_F_REMCSUM_RX)
1887                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1888                         goto drop;
1889         if (vs->flags & VXLAN_F_GBP)
1890                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1891         /* Note that GBP and GPE can never be active together. This is
1892          * ensured in vxlan_dev_configure.
1893          */
1894
1895         if (unparsed.vx_flags || unparsed.vx_vni) {
1896                 /* If there are any unprocessed flags remaining treat
1897                  * this as a malformed packet. This behavior diverges from
1898                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1899                  * in reserved fields are to be ignored. The approach here
1900                  * maintains compatibility with previous stack code, and also
1901                  * is more robust and provides a little more security in
1902                  * adding extensions to VXLAN.
1903                  */
1904                 goto drop;
1905         }
1906
1907         if (!raw_proto) {
1908                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1909                         goto drop;
1910         } else {
1911                 skb_reset_mac_header(skb);
1912                 skb->dev = vxlan->dev;
1913                 skb->pkt_type = PACKET_HOST;
1914         }
1915
1916         oiph = skb_network_header(skb);
1917         skb_reset_network_header(skb);
1918
1919         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1920                 ++vxlan->dev->stats.rx_frame_errors;
1921                 ++vxlan->dev->stats.rx_errors;
1922                 goto drop;
1923         }
1924
1925         rcu_read_lock();
1926
1927         if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
1928                 rcu_read_unlock();
1929                 atomic_long_inc(&vxlan->dev->rx_dropped);
1930                 goto drop;
1931         }
1932
1933         stats = this_cpu_ptr(vxlan->dev->tstats);
1934         u64_stats_update_begin(&stats->syncp);
1935         stats->rx_packets++;
1936         stats->rx_bytes += skb->len;
1937         u64_stats_update_end(&stats->syncp);
1938
1939         gro_cells_receive(&vxlan->gro_cells, skb);
1940
1941         rcu_read_unlock();
1942
1943         return 0;
1944
1945 drop:
1946         /* Consume bad packet */
1947         kfree_skb(skb);
1948         return 0;
1949 }
1950
1951 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
1952 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
1953 {
1954         struct vxlan_dev *vxlan;
1955         struct vxlan_sock *vs;
1956         struct vxlanhdr *hdr;
1957         __be32 vni;
1958
1959         if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
1960                 return -EINVAL;
1961
1962         hdr = vxlan_hdr(skb);
1963
1964         if (!(hdr->vx_flags & VXLAN_HF_VNI))
1965                 return -EINVAL;
1966
1967         vs = rcu_dereference_sk_user_data(sk);
1968         if (!vs)
1969                 return -ENOENT;
1970
1971         vni = vxlan_vni(hdr->vx_vni);
1972         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1973         if (!vxlan)
1974                 return -ENOENT;
1975
1976         return 0;
1977 }
1978
1979 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1980 {
1981         struct vxlan_dev *vxlan = netdev_priv(dev);
1982         struct arphdr *parp;
1983         u8 *arpptr, *sha;
1984         __be32 sip, tip;
1985         struct neighbour *n;
1986
1987         if (dev->flags & IFF_NOARP)
1988                 goto out;
1989
1990         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1991                 dev->stats.tx_dropped++;
1992                 goto out;
1993         }
1994         parp = arp_hdr(skb);
1995
1996         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1997              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1998             parp->ar_pro != htons(ETH_P_IP) ||
1999             parp->ar_op != htons(ARPOP_REQUEST) ||
2000             parp->ar_hln != dev->addr_len ||
2001             parp->ar_pln != 4)
2002                 goto out;
2003         arpptr = (u8 *)parp + sizeof(struct arphdr);
2004         sha = arpptr;
2005         arpptr += dev->addr_len;        /* sha */
2006         memcpy(&sip, arpptr, sizeof(sip));
2007         arpptr += sizeof(sip);
2008         arpptr += dev->addr_len;        /* tha */
2009         memcpy(&tip, arpptr, sizeof(tip));
2010
2011         if (ipv4_is_loopback(tip) ||
2012             ipv4_is_multicast(tip))
2013                 goto out;
2014
2015         n = neigh_lookup(&arp_tbl, &tip, dev);
2016
2017         if (n) {
2018                 struct vxlan_fdb *f;
2019                 struct sk_buff  *reply;
2020
2021                 if (!(n->nud_state & NUD_CONNECTED)) {
2022                         neigh_release(n);
2023                         goto out;
2024                 }
2025
2026                 f = vxlan_find_mac(vxlan, n->ha, vni);
2027                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2028                         /* bridge-local neighbor */
2029                         neigh_release(n);
2030                         goto out;
2031                 }
2032
2033                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
2034                                 n->ha, sha);
2035
2036                 neigh_release(n);
2037
2038                 if (reply == NULL)
2039                         goto out;
2040
2041                 skb_reset_mac_header(reply);
2042                 __skb_pull(reply, skb_network_offset(reply));
2043                 reply->ip_summed = CHECKSUM_UNNECESSARY;
2044                 reply->pkt_type = PACKET_HOST;
2045
2046                 if (netif_rx_ni(reply) == NET_RX_DROP)
2047                         dev->stats.rx_dropped++;
2048         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2049                 union vxlan_addr ipa = {
2050                         .sin.sin_addr.s_addr = tip,
2051                         .sin.sin_family = AF_INET,
2052                 };
2053
2054                 vxlan_ip_miss(dev, &ipa);
2055         }
2056 out:
2057         consume_skb(skb);
2058         return NETDEV_TX_OK;
2059 }
2060
2061 #if IS_ENABLED(CONFIG_IPV6)
2062 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
2063         struct neighbour *n, bool isrouter)
2064 {
2065         struct net_device *dev = request->dev;
2066         struct sk_buff *reply;
2067         struct nd_msg *ns, *na;
2068         struct ipv6hdr *pip6;
2069         u8 *daddr;
2070         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
2071         int ns_olen;
2072         int i, len;
2073
2074         if (dev == NULL || !pskb_may_pull(request, request->len))
2075                 return NULL;
2076
2077         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
2078                 sizeof(*na) + na_olen + dev->needed_tailroom;
2079         reply = alloc_skb(len, GFP_ATOMIC);
2080         if (reply == NULL)
2081                 return NULL;
2082
2083         reply->protocol = htons(ETH_P_IPV6);
2084         reply->dev = dev;
2085         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
2086         skb_push(reply, sizeof(struct ethhdr));
2087         skb_reset_mac_header(reply);
2088
2089         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
2090
2091         daddr = eth_hdr(request)->h_source;
2092         ns_olen = request->len - skb_network_offset(request) -
2093                 sizeof(struct ipv6hdr) - sizeof(*ns);
2094         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
2095                 if (!ns->opt[i + 1]) {
2096                         kfree_skb(reply);
2097                         return NULL;
2098                 }
2099                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
2100                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
2101                         break;
2102                 }
2103         }
2104
2105         /* Ethernet header */
2106         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
2107         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
2108         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
2109         reply->protocol = htons(ETH_P_IPV6);
2110
2111         skb_pull(reply, sizeof(struct ethhdr));
2112         skb_reset_network_header(reply);
2113         skb_put(reply, sizeof(struct ipv6hdr));
2114
2115         /* IPv6 header */
2116
2117         pip6 = ipv6_hdr(reply);
2118         memset(pip6, 0, sizeof(struct ipv6hdr));
2119         pip6->version = 6;
2120         pip6->priority = ipv6_hdr(request)->priority;
2121         pip6->nexthdr = IPPROTO_ICMPV6;
2122         pip6->hop_limit = 255;
2123         pip6->daddr = ipv6_hdr(request)->saddr;
2124         pip6->saddr = *(struct in6_addr *)n->primary_key;
2125
2126         skb_pull(reply, sizeof(struct ipv6hdr));
2127         skb_reset_transport_header(reply);
2128
2129         /* Neighbor Advertisement */
2130         na = skb_put_zero(reply, sizeof(*na) + na_olen);
2131         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
2132         na->icmph.icmp6_router = isrouter;
2133         na->icmph.icmp6_override = 1;
2134         na->icmph.icmp6_solicited = 1;
2135         na->target = ns->target;
2136         ether_addr_copy(&na->opt[2], n->ha);
2137         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
2138         na->opt[1] = na_olen >> 3;
2139
2140         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
2141                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
2142                 csum_partial(na, sizeof(*na)+na_olen, 0));
2143
2144         pip6->payload_len = htons(sizeof(*na)+na_olen);
2145
2146         skb_push(reply, sizeof(struct ipv6hdr));
2147
2148         reply->ip_summed = CHECKSUM_UNNECESSARY;
2149
2150         return reply;
2151 }
2152
2153 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
2154 {
2155         struct vxlan_dev *vxlan = netdev_priv(dev);
2156         const struct in6_addr *daddr;
2157         const struct ipv6hdr *iphdr;
2158         struct inet6_dev *in6_dev;
2159         struct neighbour *n;
2160         struct nd_msg *msg;
2161
2162         in6_dev = __in6_dev_get(dev);
2163         if (!in6_dev)
2164                 goto out;
2165
2166         iphdr = ipv6_hdr(skb);
2167         daddr = &iphdr->daddr;
2168         msg = (struct nd_msg *)(iphdr + 1);
2169
2170         if (ipv6_addr_loopback(daddr) ||
2171             ipv6_addr_is_multicast(&msg->target))
2172                 goto out;
2173
2174         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
2175
2176         if (n) {
2177                 struct vxlan_fdb *f;
2178                 struct sk_buff *reply;
2179
2180                 if (!(n->nud_state & NUD_CONNECTED)) {
2181                         neigh_release(n);
2182                         goto out;
2183                 }
2184
2185                 f = vxlan_find_mac(vxlan, n->ha, vni);
2186                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
2187                         /* bridge-local neighbor */
2188                         neigh_release(n);
2189                         goto out;
2190                 }
2191
2192                 reply = vxlan_na_create(skb, n,
2193                                         !!(f ? f->flags & NTF_ROUTER : 0));
2194
2195                 neigh_release(n);
2196
2197                 if (reply == NULL)
2198                         goto out;
2199
2200                 if (netif_rx_ni(reply) == NET_RX_DROP)
2201                         dev->stats.rx_dropped++;
2202
2203         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
2204                 union vxlan_addr ipa = {
2205                         .sin6.sin6_addr = msg->target,
2206                         .sin6.sin6_family = AF_INET6,
2207                 };
2208
2209                 vxlan_ip_miss(dev, &ipa);
2210         }
2211
2212 out:
2213         consume_skb(skb);
2214         return NETDEV_TX_OK;
2215 }
2216 #endif
2217
2218 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
2219 {
2220         struct vxlan_dev *vxlan = netdev_priv(dev);
2221         struct neighbour *n;
2222
2223         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
2224                 return false;
2225
2226         n = NULL;
2227         switch (ntohs(eth_hdr(skb)->h_proto)) {
2228         case ETH_P_IP:
2229         {
2230                 struct iphdr *pip;
2231
2232                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
2233                         return false;
2234                 pip = ip_hdr(skb);
2235                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
2236                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2237                         union vxlan_addr ipa = {
2238                                 .sin.sin_addr.s_addr = pip->daddr,
2239                                 .sin.sin_family = AF_INET,
2240                         };
2241
2242                         vxlan_ip_miss(dev, &ipa);
2243                         return false;
2244                 }
2245
2246                 break;
2247         }
2248 #if IS_ENABLED(CONFIG_IPV6)
2249         case ETH_P_IPV6:
2250         {
2251                 struct ipv6hdr *pip6;
2252
2253                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
2254                         return false;
2255                 pip6 = ipv6_hdr(skb);
2256                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
2257                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
2258                         union vxlan_addr ipa = {
2259                                 .sin6.sin6_addr = pip6->daddr,
2260                                 .sin6.sin6_family = AF_INET6,
2261                         };
2262
2263                         vxlan_ip_miss(dev, &ipa);
2264                         return false;
2265                 }
2266
2267                 break;
2268         }
2269 #endif
2270         default:
2271                 return false;
2272         }
2273
2274         if (n) {
2275                 bool diff;
2276
2277                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
2278                 if (diff) {
2279                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
2280                                 dev->addr_len);
2281                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
2282                 }
2283                 neigh_release(n);
2284                 return diff;
2285         }
2286
2287         return false;
2288 }
2289
2290 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
2291                                 struct vxlan_metadata *md)
2292 {
2293         struct vxlanhdr_gbp *gbp;
2294
2295         if (!md->gbp)
2296                 return;
2297
2298         gbp = (struct vxlanhdr_gbp *)vxh;
2299         vxh->vx_flags |= VXLAN_HF_GBP;
2300
2301         if (md->gbp & VXLAN_GBP_DONT_LEARN)
2302                 gbp->dont_learn = 1;
2303
2304         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
2305                 gbp->policy_applied = 1;
2306
2307         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
2308 }
2309
2310 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
2311                                __be16 protocol)
2312 {
2313         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
2314
2315         gpe->np_applied = 1;
2316         gpe->next_protocol = tun_p_from_eth_p(protocol);
2317         if (!gpe->next_protocol)
2318                 return -EPFNOSUPPORT;
2319         return 0;
2320 }
2321
2322 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
2323                            int iphdr_len, __be32 vni,
2324                            struct vxlan_metadata *md, u32 vxflags,
2325                            bool udp_sum)
2326 {
2327         struct vxlanhdr *vxh;
2328         int min_headroom;
2329         int err;
2330         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
2331         __be16 inner_protocol = htons(ETH_P_TEB);
2332
2333         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
2334             skb->ip_summed == CHECKSUM_PARTIAL) {
2335                 int csum_start = skb_checksum_start_offset(skb);
2336
2337                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
2338                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
2339                     (skb->csum_offset == offsetof(struct udphdr, check) ||
2340                      skb->csum_offset == offsetof(struct tcphdr, check)))
2341                         type |= SKB_GSO_TUNNEL_REMCSUM;
2342         }
2343
2344         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
2345                         + VXLAN_HLEN + iphdr_len;
2346
2347         /* Need space for new headers (invalidates iph ptr) */
2348         err = skb_cow_head(skb, min_headroom);
2349         if (unlikely(err))
2350                 return err;
2351
2352         err = iptunnel_handle_offloads(skb, type);
2353         if (err)
2354                 return err;
2355
2356         vxh = __skb_push(skb, sizeof(*vxh));
2357         vxh->vx_flags = VXLAN_HF_VNI;
2358         vxh->vx_vni = vxlan_vni_field(vni);
2359
2360         if (type & SKB_GSO_TUNNEL_REMCSUM) {
2361                 unsigned int start;
2362
2363                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
2364                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
2365                 vxh->vx_flags |= VXLAN_HF_RCO;
2366
2367                 if (!skb_is_gso(skb)) {
2368                         skb->ip_summed = CHECKSUM_NONE;
2369                         skb->encapsulation = 0;
2370                 }
2371         }
2372
2373         if (vxflags & VXLAN_F_GBP)
2374                 vxlan_build_gbp_hdr(vxh, vxflags, md);
2375         if (vxflags & VXLAN_F_GPE) {
2376                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
2377                 if (err < 0)
2378                         return err;
2379                 inner_protocol = skb->protocol;
2380         }
2381
2382         skb_set_inner_protocol(skb, inner_protocol);
2383         return 0;
2384 }
2385
2386 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
2387                                       struct vxlan_sock *sock4,
2388                                       struct sk_buff *skb, int oif, u8 tos,
2389                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
2390                                       struct dst_cache *dst_cache,
2391                                       const struct ip_tunnel_info *info)
2392 {
2393         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2394         struct rtable *rt = NULL;
2395         struct flowi4 fl4;
2396
2397         if (!sock4)
2398                 return ERR_PTR(-EIO);
2399
2400         if (tos && !info)
2401                 use_cache = false;
2402         if (use_cache) {
2403                 rt = dst_cache_get_ip4(dst_cache, saddr);
2404                 if (rt)
2405                         return rt;
2406         }
2407
2408         memset(&fl4, 0, sizeof(fl4));
2409         fl4.flowi4_oif = oif;
2410         fl4.flowi4_tos = RT_TOS(tos);
2411         fl4.flowi4_mark = skb->mark;
2412         fl4.flowi4_proto = IPPROTO_UDP;
2413         fl4.daddr = daddr;
2414         fl4.saddr = *saddr;
2415         fl4.fl4_dport = dport;
2416         fl4.fl4_sport = sport;
2417
2418         rt = ip_route_output_key(vxlan->net, &fl4);
2419         if (!IS_ERR(rt)) {
2420                 if (rt->dst.dev == dev) {
2421                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
2422                         ip_rt_put(rt);
2423                         return ERR_PTR(-ELOOP);
2424                 }
2425
2426                 *saddr = fl4.saddr;
2427                 if (use_cache)
2428                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
2429         } else {
2430                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
2431                 return ERR_PTR(-ENETUNREACH);
2432         }
2433         return rt;
2434 }
2435
2436 #if IS_ENABLED(CONFIG_IPV6)
2437 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
2438                                           struct net_device *dev,
2439                                           struct vxlan_sock *sock6,
2440                                           struct sk_buff *skb, int oif, u8 tos,
2441                                           __be32 label,
2442                                           const struct in6_addr *daddr,
2443                                           struct in6_addr *saddr,
2444                                           __be16 dport, __be16 sport,
2445                                           struct dst_cache *dst_cache,
2446                                           const struct ip_tunnel_info *info)
2447 {
2448         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
2449         struct dst_entry *ndst;
2450         struct flowi6 fl6;
2451
2452         if (!sock6)
2453                 return ERR_PTR(-EIO);
2454
2455         if (tos && !info)
2456                 use_cache = false;
2457         if (use_cache) {
2458                 ndst = dst_cache_get_ip6(dst_cache, saddr);
2459                 if (ndst)
2460                         return ndst;
2461         }
2462
2463         memset(&fl6, 0, sizeof(fl6));
2464         fl6.flowi6_oif = oif;
2465         fl6.daddr = *daddr;
2466         fl6.saddr = *saddr;
2467         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
2468         fl6.flowi6_mark = skb->mark;
2469         fl6.flowi6_proto = IPPROTO_UDP;
2470         fl6.fl6_dport = dport;
2471         fl6.fl6_sport = sport;
2472
2473         ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
2474                                                &fl6, NULL);
2475         if (unlikely(IS_ERR(ndst))) {
2476                 netdev_dbg(dev, "no route to %pI6\n", daddr);
2477                 return ERR_PTR(-ENETUNREACH);
2478         }
2479
2480         if (unlikely(ndst->dev == dev)) {
2481                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
2482                 dst_release(ndst);
2483                 return ERR_PTR(-ELOOP);
2484         }
2485
2486         *saddr = fl6.saddr;
2487         if (use_cache)
2488                 dst_cache_set_ip6(dst_cache, ndst, saddr);
2489         return ndst;
2490 }
2491 #endif
2492
2493 /* Bypass encapsulation if the destination is local */
2494 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
2495                                struct vxlan_dev *dst_vxlan, __be32 vni)
2496 {
2497         struct pcpu_sw_netstats *tx_stats, *rx_stats;
2498         union vxlan_addr loopback;
2499         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
2500         struct net_device *dev;
2501         int len = skb->len;
2502
2503         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2504         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2505         skb->pkt_type = PACKET_HOST;
2506         skb->encapsulation = 0;
2507         skb->dev = dst_vxlan->dev;
2508         __skb_pull(skb, skb_network_offset(skb));
2509
2510         if (remote_ip->sa.sa_family == AF_INET) {
2511                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2512                 loopback.sa.sa_family =  AF_INET;
2513 #if IS_ENABLED(CONFIG_IPV6)
2514         } else {
2515                 loopback.sin6.sin6_addr = in6addr_loopback;
2516                 loopback.sa.sa_family =  AF_INET6;
2517 #endif
2518         }
2519
2520         rcu_read_lock();
2521         dev = skb->dev;
2522         if (unlikely(!(dev->flags & IFF_UP))) {
2523                 kfree_skb(skb);
2524                 goto drop;
2525         }
2526
2527         if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2528                 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
2529
2530         u64_stats_update_begin(&tx_stats->syncp);
2531         tx_stats->tx_packets++;
2532         tx_stats->tx_bytes += len;
2533         u64_stats_update_end(&tx_stats->syncp);
2534
2535         if (netif_rx(skb) == NET_RX_SUCCESS) {
2536                 u64_stats_update_begin(&rx_stats->syncp);
2537                 rx_stats->rx_packets++;
2538                 rx_stats->rx_bytes += len;
2539                 u64_stats_update_end(&rx_stats->syncp);
2540         } else {
2541 drop:
2542                 dev->stats.rx_dropped++;
2543         }
2544         rcu_read_unlock();
2545 }
2546
2547 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2548                                  struct vxlan_dev *vxlan,
2549                                  union vxlan_addr *daddr,
2550                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2551                                  struct dst_entry *dst,
2552                                  u32 rt_flags)
2553 {
2554 #if IS_ENABLED(CONFIG_IPV6)
2555         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2556          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2557          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2558          */
2559         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2560 #endif
2561         /* Bypass encapsulation if the destination is local */
2562         if (rt_flags & RTCF_LOCAL &&
2563             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2564                 struct vxlan_dev *dst_vxlan;
2565
2566                 dst_release(dst);
2567                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2568                                            daddr->sa.sa_family, dst_port,
2569                                            vxlan->cfg.flags);
2570                 if (!dst_vxlan) {
2571                         dev->stats.tx_errors++;
2572                         kfree_skb(skb);
2573
2574                         return -ENOENT;
2575                 }
2576                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2577                 return 1;
2578         }
2579
2580         return 0;
2581 }
2582
2583 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2584                            __be32 default_vni, struct vxlan_rdst *rdst,
2585                            bool did_rsc)
2586 {
2587         struct dst_cache *dst_cache;
2588         struct ip_tunnel_info *info;
2589         struct vxlan_dev *vxlan = netdev_priv(dev);
2590         const struct iphdr *old_iph = ip_hdr(skb);
2591         union vxlan_addr *dst;
2592         union vxlan_addr remote_ip, local_ip;
2593         struct vxlan_metadata _md;
2594         struct vxlan_metadata *md = &_md;
2595         __be16 src_port = 0, dst_port;
2596         struct dst_entry *ndst = NULL;
2597         __be32 vni, label;
2598         __u8 tos, ttl;
2599         int ifindex;
2600         int err;
2601         u32 flags = vxlan->cfg.flags;
2602         bool udp_sum = false;
2603         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2604
2605         info = skb_tunnel_info(skb);
2606
2607         if (rdst) {
2608                 dst = &rdst->remote_ip;
2609                 if (vxlan_addr_any(dst)) {
2610                         if (did_rsc) {
2611                                 /* short-circuited back to local bridge */
2612                                 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2613                                 return;
2614                         }
2615                         goto drop;
2616                 }
2617
2618                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2619                 vni = (rdst->remote_vni) ? : default_vni;
2620                 ifindex = rdst->remote_ifindex;
2621                 local_ip = vxlan->cfg.saddr;
2622                 dst_cache = &rdst->dst_cache;
2623                 md->gbp = skb->mark;
2624                 if (flags & VXLAN_F_TTL_INHERIT) {
2625                         ttl = ip_tunnel_get_ttl(old_iph, skb);
2626                 } else {
2627                         ttl = vxlan->cfg.ttl;
2628                         if (!ttl && vxlan_addr_multicast(dst))
2629                                 ttl = 1;
2630                 }
2631
2632                 tos = vxlan->cfg.tos;
2633                 if (tos == 1)
2634                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2635
2636                 if (dst->sa.sa_family == AF_INET)
2637                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2638                 else
2639                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2640                 label = vxlan->cfg.label;
2641         } else {
2642                 if (!info) {
2643                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2644                                   dev->name);
2645                         goto drop;
2646                 }
2647                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2648                 if (remote_ip.sa.sa_family == AF_INET) {
2649                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2650                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2651                 } else {
2652                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2653                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2654                 }
2655                 dst = &remote_ip;
2656                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2657                 vni = tunnel_id_to_key32(info->key.tun_id);
2658                 ifindex = 0;
2659                 dst_cache = &info->dst_cache;
2660                 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
2661                         if (info->options_len < sizeof(*md))
2662                                 goto drop;
2663                         md = ip_tunnel_info_opts(info);
2664                 }
2665                 ttl = info->key.ttl;
2666                 tos = info->key.tos;
2667                 label = info->key.label;
2668                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2669         }
2670         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2671                                      vxlan->cfg.port_max, true);
2672
2673         rcu_read_lock();
2674         if (dst->sa.sa_family == AF_INET) {
2675                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2676                 struct rtable *rt;
2677                 __be16 df = 0;
2678
2679                 if (!ifindex)
2680                         ifindex = sock4->sock->sk->sk_bound_dev_if;
2681
2682                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2683                                      dst->sin.sin_addr.s_addr,
2684                                      &local_ip.sin.sin_addr.s_addr,
2685                                      dst_port, src_port,
2686                                      dst_cache, info);
2687                 if (IS_ERR(rt)) {
2688                         err = PTR_ERR(rt);
2689                         goto tx_error;
2690                 }
2691
2692                 if (!info) {
2693                         /* Bypass encapsulation if the destination is local */
2694                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2695                                                     dst_port, ifindex, vni,
2696                                                     &rt->dst, rt->rt_flags);
2697                         if (err)
2698                                 goto out_unlock;
2699
2700                         if (vxlan->cfg.df == VXLAN_DF_SET) {
2701                                 df = htons(IP_DF);
2702                         } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
2703                                 struct ethhdr *eth = eth_hdr(skb);
2704
2705                                 if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
2706                                     (ntohs(eth->h_proto) == ETH_P_IP &&
2707                                      old_iph->frag_off & htons(IP_DF)))
2708                                         df = htons(IP_DF);
2709                         }
2710                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2711                         df = htons(IP_DF);
2712                 }
2713
2714                 ndst = &rt->dst;
2715                 skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM);
2716
2717                 tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb);
2718                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2719                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2720                                       vni, md, flags, udp_sum);
2721                 if (err < 0)
2722                         goto tx_error;
2723
2724                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2725                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2726                                     src_port, dst_port, xnet, !udp_sum);
2727 #if IS_ENABLED(CONFIG_IPV6)
2728         } else {
2729                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2730
2731                 if (!ifindex)
2732                         ifindex = sock6->sock->sk->sk_bound_dev_if;
2733
2734                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2735                                         label, &dst->sin6.sin6_addr,
2736                                         &local_ip.sin6.sin6_addr,
2737                                         dst_port, src_port,
2738                                         dst_cache, info);
2739                 if (IS_ERR(ndst)) {
2740                         err = PTR_ERR(ndst);
2741                         ndst = NULL;
2742                         goto tx_error;
2743                 }
2744
2745                 if (!info) {
2746                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2747
2748                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2749                                                     dst_port, ifindex, vni,
2750                                                     ndst, rt6i_flags);
2751                         if (err)
2752                                 goto out_unlock;
2753                 }
2754
2755                 skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM);
2756
2757                 tos = ip_tunnel_ecn_encap(RT_TOS(tos), old_iph, skb);
2758                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2759                 skb_scrub_packet(skb, xnet);
2760                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2761                                       vni, md, flags, udp_sum);
2762                 if (err < 0)
2763                         goto tx_error;
2764
2765                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2766                                      &local_ip.sin6.sin6_addr,
2767                                      &dst->sin6.sin6_addr, tos, ttl,
2768                                      label, src_port, dst_port, !udp_sum);
2769 #endif
2770         }
2771 out_unlock:
2772         rcu_read_unlock();
2773         return;
2774
2775 drop:
2776         dev->stats.tx_dropped++;
2777         dev_kfree_skb(skb);
2778         return;
2779
2780 tx_error:
2781         rcu_read_unlock();
2782         if (err == -ELOOP)
2783                 dev->stats.collisions++;
2784         else if (err == -ENETUNREACH)
2785                 dev->stats.tx_carrier_errors++;
2786         dst_release(ndst);
2787         dev->stats.tx_errors++;
2788         kfree_skb(skb);
2789 }
2790
2791 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
2792                           struct vxlan_fdb *f, __be32 vni, bool did_rsc)
2793 {
2794         struct vxlan_rdst nh_rdst;
2795         struct nexthop *nh;
2796         bool do_xmit;
2797         u32 hash;
2798
2799         memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
2800         hash = skb_get_hash(skb);
2801
2802         rcu_read_lock();
2803         nh = rcu_dereference(f->nh);
2804         if (!nh) {
2805                 rcu_read_unlock();
2806                 goto drop;
2807         }
2808         do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
2809         rcu_read_unlock();
2810
2811         if (likely(do_xmit))
2812                 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
2813         else
2814                 goto drop;
2815
2816         return;
2817
2818 drop:
2819         dev->stats.tx_dropped++;
2820         dev_kfree_skb(skb);
2821 }
2822
2823 /* Transmit local packets over Vxlan
2824  *
2825  * Outer IP header inherits ECN and DF from inner header.
2826  * Outer UDP destination is the VXLAN assigned port.
2827  *           source port is based on hash of flow
2828  */
2829 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2830 {
2831         struct vxlan_dev *vxlan = netdev_priv(dev);
2832         struct vxlan_rdst *rdst, *fdst = NULL;
2833         const struct ip_tunnel_info *info;
2834         bool did_rsc = false;
2835         struct vxlan_fdb *f;
2836         struct ethhdr *eth;
2837         __be32 vni = 0;
2838
2839         info = skb_tunnel_info(skb);
2840
2841         skb_reset_mac_header(skb);
2842
2843         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2844                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2845                     info->mode & IP_TUNNEL_INFO_TX) {
2846                         vni = tunnel_id_to_key32(info->key.tun_id);
2847                 } else {
2848                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2849                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2850                         else
2851                                 kfree_skb(skb);
2852                         return NETDEV_TX_OK;
2853                 }
2854         }
2855
2856         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2857                 eth = eth_hdr(skb);
2858                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2859                         return arp_reduce(dev, skb, vni);
2860 #if IS_ENABLED(CONFIG_IPV6)
2861                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2862                          pskb_may_pull(skb, sizeof(struct ipv6hdr) +
2863                                             sizeof(struct nd_msg)) &&
2864                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2865                         struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
2866
2867                         if (m->icmph.icmp6_code == 0 &&
2868                             m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2869                                 return neigh_reduce(dev, skb, vni);
2870                 }
2871 #endif
2872         }
2873
2874         eth = eth_hdr(skb);
2875         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2876         did_rsc = false;
2877
2878         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2879             (ntohs(eth->h_proto) == ETH_P_IP ||
2880              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2881                 did_rsc = route_shortcircuit(dev, skb);
2882                 if (did_rsc)
2883                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2884         }
2885
2886         if (f == NULL) {
2887                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2888                 if (f == NULL) {
2889                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2890                             !is_multicast_ether_addr(eth->h_dest))
2891                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2892
2893                         dev->stats.tx_dropped++;
2894                         kfree_skb(skb);
2895                         return NETDEV_TX_OK;
2896                 }
2897         }
2898
2899         if (rcu_access_pointer(f->nh)) {
2900                 vxlan_xmit_nh(skb, dev, f,
2901                               (vni ? : vxlan->default_dst.remote_vni), did_rsc);
2902         } else {
2903                 list_for_each_entry_rcu(rdst, &f->remotes, list) {
2904                         struct sk_buff *skb1;
2905
2906                         if (!fdst) {
2907                                 fdst = rdst;
2908                                 continue;
2909                         }
2910                         skb1 = skb_clone(skb, GFP_ATOMIC);
2911                         if (skb1)
2912                                 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2913                 }
2914                 if (fdst)
2915                         vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2916                 else
2917                         kfree_skb(skb);
2918         }
2919
2920         return NETDEV_TX_OK;
2921 }
2922
2923 /* Walk the forwarding table and purge stale entries */
2924 static void vxlan_cleanup(struct timer_list *t)
2925 {
2926         struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
2927         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2928         unsigned int h;
2929
2930         if (!netif_running(vxlan->dev))
2931                 return;
2932
2933         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2934                 struct hlist_node *p, *n;
2935
2936                 spin_lock(&vxlan->hash_lock[h]);
2937                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2938                         struct vxlan_fdb *f
2939                                 = container_of(p, struct vxlan_fdb, hlist);
2940                         unsigned long timeout;
2941
2942                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2943                                 continue;
2944
2945                         if (f->flags & NTF_EXT_LEARNED)
2946                                 continue;
2947
2948                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2949                         if (time_before_eq(timeout, jiffies)) {
2950                                 netdev_dbg(vxlan->dev,
2951                                            "garbage collect %pM\n",
2952                                            f->eth_addr);
2953                                 f->state = NUD_STALE;
2954                                 vxlan_fdb_destroy(vxlan, f, true, true);
2955                         } else if (time_before(timeout, next_timer))
2956                                 next_timer = timeout;
2957                 }
2958                 spin_unlock(&vxlan->hash_lock[h]);
2959         }
2960
2961         mod_timer(&vxlan->age_timer, next_timer);
2962 }
2963
2964 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2965 {
2966         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2967
2968         spin_lock(&vn->sock_lock);
2969         hlist_del_init_rcu(&vxlan->hlist4.hlist);
2970 #if IS_ENABLED(CONFIG_IPV6)
2971         hlist_del_init_rcu(&vxlan->hlist6.hlist);
2972 #endif
2973         spin_unlock(&vn->sock_lock);
2974 }
2975
2976 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2977                              struct vxlan_dev_node *node)
2978 {
2979         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2980         __be32 vni = vxlan->default_dst.remote_vni;
2981
2982         node->vxlan = vxlan;
2983         spin_lock(&vn->sock_lock);
2984         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2985         spin_unlock(&vn->sock_lock);
2986 }
2987
2988 /* Setup stats when device is created */
2989 static int vxlan_init(struct net_device *dev)
2990 {
2991         struct vxlan_dev *vxlan = netdev_priv(dev);
2992         int err;
2993
2994         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2995         if (!dev->tstats)
2996                 return -ENOMEM;
2997
2998         err = gro_cells_init(&vxlan->gro_cells, dev);
2999         if (err) {
3000                 free_percpu(dev->tstats);
3001                 return err;
3002         }
3003
3004         return 0;
3005 }
3006
3007 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
3008 {
3009         struct vxlan_fdb *f;
3010         u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
3011
3012         spin_lock_bh(&vxlan->hash_lock[hash_index]);
3013         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
3014         if (f)
3015                 vxlan_fdb_destroy(vxlan, f, true, true);
3016         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
3017 }
3018
3019 static void vxlan_uninit(struct net_device *dev)
3020 {
3021         struct vxlan_dev *vxlan = netdev_priv(dev);
3022
3023         gro_cells_destroy(&vxlan->gro_cells);
3024
3025         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
3026
3027         free_percpu(dev->tstats);
3028 }
3029
3030 /* Start ageing timer and join group when device is brought up */
3031 static int vxlan_open(struct net_device *dev)
3032 {
3033         struct vxlan_dev *vxlan = netdev_priv(dev);
3034         int ret;
3035
3036         ret = vxlan_sock_add(vxlan);
3037         if (ret < 0)
3038                 return ret;
3039
3040         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
3041                 ret = vxlan_igmp_join(vxlan);
3042                 if (ret == -EADDRINUSE)
3043                         ret = 0;
3044                 if (ret) {
3045                         vxlan_sock_release(vxlan);
3046                         return ret;
3047                 }
3048         }
3049
3050         if (vxlan->cfg.age_interval)
3051                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
3052
3053         return ret;
3054 }
3055
3056 /* Purge the forwarding table */
3057 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
3058 {
3059         unsigned int h;
3060
3061         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3062                 struct hlist_node *p, *n;
3063
3064                 spin_lock_bh(&vxlan->hash_lock[h]);
3065                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
3066                         struct vxlan_fdb *f
3067                                 = container_of(p, struct vxlan_fdb, hlist);
3068                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
3069                                 continue;
3070                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
3071                         if (!is_zero_ether_addr(f->eth_addr))
3072                                 vxlan_fdb_destroy(vxlan, f, true, true);
3073                 }
3074                 spin_unlock_bh(&vxlan->hash_lock[h]);
3075         }
3076 }
3077
3078 /* Cleanup timer and forwarding table on shutdown */
3079 static int vxlan_stop(struct net_device *dev)
3080 {
3081         struct vxlan_dev *vxlan = netdev_priv(dev);
3082         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3083         int ret = 0;
3084
3085         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
3086             !vxlan_group_used(vn, vxlan))
3087                 ret = vxlan_igmp_leave(vxlan);
3088
3089         del_timer_sync(&vxlan->age_timer);
3090
3091         vxlan_flush(vxlan, false);
3092         vxlan_sock_release(vxlan);
3093
3094         return ret;
3095 }
3096
3097 /* Stub, nothing needs to be done. */
3098 static void vxlan_set_multicast_list(struct net_device *dev)
3099 {
3100 }
3101
3102 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
3103 {
3104         struct vxlan_dev *vxlan = netdev_priv(dev);
3105         struct vxlan_rdst *dst = &vxlan->default_dst;
3106         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3107                                                          dst->remote_ifindex);
3108         bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
3109
3110         /* This check is different than dev->max_mtu, because it looks at
3111          * the lowerdev->mtu, rather than the static dev->max_mtu
3112          */
3113         if (lowerdev) {
3114                 int max_mtu = lowerdev->mtu -
3115                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
3116                 if (new_mtu > max_mtu)
3117                         return -EINVAL;
3118         }
3119
3120         dev->mtu = new_mtu;
3121         return 0;
3122 }
3123
3124 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
3125 {
3126         struct vxlan_dev *vxlan = netdev_priv(dev);
3127         struct ip_tunnel_info *info = skb_tunnel_info(skb);
3128         __be16 sport, dport;
3129
3130         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
3131                                   vxlan->cfg.port_max, true);
3132         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
3133
3134         if (ip_tunnel_info_af(info) == AF_INET) {
3135                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
3136                 struct rtable *rt;
3137
3138                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
3139                                      info->key.u.ipv4.dst,
3140                                      &info->key.u.ipv4.src, dport, sport,
3141                                      &info->dst_cache, info);
3142                 if (IS_ERR(rt))
3143                         return PTR_ERR(rt);
3144                 ip_rt_put(rt);
3145         } else {
3146 #if IS_ENABLED(CONFIG_IPV6)
3147                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
3148                 struct dst_entry *ndst;
3149
3150                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
3151                                         info->key.label, &info->key.u.ipv6.dst,
3152                                         &info->key.u.ipv6.src, dport, sport,
3153                                         &info->dst_cache, info);
3154                 if (IS_ERR(ndst))
3155                         return PTR_ERR(ndst);
3156                 dst_release(ndst);
3157 #else /* !CONFIG_IPV6 */
3158                 return -EPFNOSUPPORT;
3159 #endif
3160         }
3161         info->key.tp_src = sport;
3162         info->key.tp_dst = dport;
3163         return 0;
3164 }
3165
3166 static const struct net_device_ops vxlan_netdev_ether_ops = {
3167         .ndo_init               = vxlan_init,
3168         .ndo_uninit             = vxlan_uninit,
3169         .ndo_open               = vxlan_open,
3170         .ndo_stop               = vxlan_stop,
3171         .ndo_start_xmit         = vxlan_xmit,
3172         .ndo_get_stats64        = ip_tunnel_get_stats64,
3173         .ndo_set_rx_mode        = vxlan_set_multicast_list,
3174         .ndo_change_mtu         = vxlan_change_mtu,
3175         .ndo_validate_addr      = eth_validate_addr,
3176         .ndo_set_mac_address    = eth_mac_addr,
3177         .ndo_fdb_add            = vxlan_fdb_add,
3178         .ndo_fdb_del            = vxlan_fdb_delete,
3179         .ndo_fdb_dump           = vxlan_fdb_dump,
3180         .ndo_fdb_get            = vxlan_fdb_get,
3181         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3182         .ndo_change_proto_down  = dev_change_proto_down_generic,
3183 };
3184
3185 static const struct net_device_ops vxlan_netdev_raw_ops = {
3186         .ndo_init               = vxlan_init,
3187         .ndo_uninit             = vxlan_uninit,
3188         .ndo_open               = vxlan_open,
3189         .ndo_stop               = vxlan_stop,
3190         .ndo_start_xmit         = vxlan_xmit,
3191         .ndo_get_stats64        = ip_tunnel_get_stats64,
3192         .ndo_change_mtu         = vxlan_change_mtu,
3193         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
3194 };
3195
3196 /* Info for udev, that this is a virtual tunnel endpoint */
3197 static struct device_type vxlan_type = {
3198         .name = "vxlan",
3199 };
3200
3201 /* Calls the ndo_udp_tunnel_add of the caller in order to
3202  * supply the listening VXLAN udp ports. Callers are expected
3203  * to implement the ndo_udp_tunnel_add.
3204  */
3205 static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
3206 {
3207         struct vxlan_sock *vs;
3208         struct net *net = dev_net(dev);
3209         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3210         unsigned int i;
3211
3212         spin_lock(&vn->sock_lock);
3213         for (i = 0; i < PORT_HASH_SIZE; ++i) {
3214                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
3215                         unsigned short type;
3216
3217                         if (vs->flags & VXLAN_F_GPE)
3218                                 type = UDP_TUNNEL_TYPE_VXLAN_GPE;
3219                         else
3220                                 type = UDP_TUNNEL_TYPE_VXLAN;
3221
3222                         if (push)
3223                                 udp_tunnel_push_rx_port(dev, vs->sock, type);
3224                         else
3225                                 udp_tunnel_drop_rx_port(dev, vs->sock, type);
3226                 }
3227         }
3228         spin_unlock(&vn->sock_lock);
3229 }
3230
3231 /* Initialize the device structure. */
3232 static void vxlan_setup(struct net_device *dev)
3233 {
3234         struct vxlan_dev *vxlan = netdev_priv(dev);
3235         unsigned int h;
3236
3237         eth_hw_addr_random(dev);
3238         ether_setup(dev);
3239
3240         dev->needs_free_netdev = true;
3241         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
3242
3243         dev->features   |= NETIF_F_LLTX;
3244         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
3245         dev->features   |= NETIF_F_RXCSUM;
3246         dev->features   |= NETIF_F_GSO_SOFTWARE;
3247
3248         dev->vlan_features = dev->features;
3249         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
3250         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
3251         netif_keep_dst(dev);
3252         dev->priv_flags |= IFF_NO_QUEUE;
3253
3254         /* MTU range: 68 - 65535 */
3255         dev->min_mtu = ETH_MIN_MTU;
3256         dev->max_mtu = ETH_MAX_MTU;
3257
3258         INIT_LIST_HEAD(&vxlan->next);
3259
3260         timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
3261
3262         vxlan->dev = dev;
3263
3264         for (h = 0; h < FDB_HASH_SIZE; ++h) {
3265                 spin_lock_init(&vxlan->hash_lock[h]);
3266                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
3267         }
3268 }
3269
3270 static void vxlan_ether_setup(struct net_device *dev)
3271 {
3272         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
3273         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3274         dev->netdev_ops = &vxlan_netdev_ether_ops;
3275 }
3276
3277 static void vxlan_raw_setup(struct net_device *dev)
3278 {
3279         dev->header_ops = NULL;
3280         dev->type = ARPHRD_NONE;
3281         dev->hard_header_len = 0;
3282         dev->addr_len = 0;
3283         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
3284         dev->netdev_ops = &vxlan_netdev_raw_ops;
3285 }
3286
3287 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
3288         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
3289         [IFLA_VXLAN_GROUP]      = { .len = sizeof_field(struct iphdr, daddr) },
3290         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
3291         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
3292         [IFLA_VXLAN_LOCAL]      = { .len = sizeof_field(struct iphdr, saddr) },
3293         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
3294         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
3295         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
3296         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
3297         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
3298         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
3299         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
3300         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
3301         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
3302         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
3303         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
3304         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
3305         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
3306         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
3307         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
3308         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
3309         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
3310         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
3311         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
3312         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
3313         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
3314         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
3315         [IFLA_VXLAN_TTL_INHERIT]        = { .type = NLA_FLAG },
3316         [IFLA_VXLAN_DF]         = { .type = NLA_U8 },
3317 };
3318
3319 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
3320                           struct netlink_ext_ack *extack)
3321 {
3322         if (tb[IFLA_ADDRESS]) {
3323                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
3324                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3325                                             "Provided link layer address is not Ethernet");
3326                         return -EINVAL;
3327                 }
3328
3329                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
3330                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
3331                                             "Provided Ethernet address is not unicast");
3332                         return -EADDRNOTAVAIL;
3333                 }
3334         }
3335
3336         if (tb[IFLA_MTU]) {
3337                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
3338
3339                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
3340                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
3341                                             "MTU must be between 68 and 65535");
3342                         return -EINVAL;
3343                 }
3344         }
3345
3346         if (!data) {
3347                 NL_SET_ERR_MSG(extack,
3348                                "Required attributes not provided to perform the operation");
3349                 return -EINVAL;
3350         }
3351
3352         if (data[IFLA_VXLAN_ID]) {
3353                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
3354
3355                 if (id >= VXLAN_N_VID) {
3356                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
3357                                             "VXLAN ID must be lower than 16777216");
3358                         return -ERANGE;
3359                 }
3360         }
3361
3362         if (data[IFLA_VXLAN_PORT_RANGE]) {
3363                 const struct ifla_vxlan_port_range *p
3364                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3365
3366                 if (ntohs(p->high) < ntohs(p->low)) {
3367                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
3368                                             "Invalid source port range");
3369                         return -EINVAL;
3370                 }
3371         }
3372
3373         if (data[IFLA_VXLAN_DF]) {
3374                 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
3375
3376                 if (df < 0 || df > VXLAN_DF_MAX) {
3377                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
3378                                             "Invalid DF attribute");
3379                         return -EINVAL;
3380                 }
3381         }
3382
3383         return 0;
3384 }
3385
3386 static void vxlan_get_drvinfo(struct net_device *netdev,
3387                               struct ethtool_drvinfo *drvinfo)
3388 {
3389         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
3390         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
3391 }
3392
3393 static int vxlan_get_link_ksettings(struct net_device *dev,
3394                                     struct ethtool_link_ksettings *cmd)
3395 {
3396         struct vxlan_dev *vxlan = netdev_priv(dev);
3397         struct vxlan_rdst *dst = &vxlan->default_dst;
3398         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
3399                                                          dst->remote_ifindex);
3400
3401         if (!lowerdev) {
3402                 cmd->base.duplex = DUPLEX_UNKNOWN;
3403                 cmd->base.port = PORT_OTHER;
3404                 cmd->base.speed = SPEED_UNKNOWN;
3405
3406                 return 0;
3407         }
3408
3409         return __ethtool_get_link_ksettings(lowerdev, cmd);
3410 }
3411
3412 static const struct ethtool_ops vxlan_ethtool_ops = {
3413         .get_drvinfo            = vxlan_get_drvinfo,
3414         .get_link               = ethtool_op_get_link,
3415         .get_link_ksettings     = vxlan_get_link_ksettings,
3416 };
3417
3418 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
3419                                         __be16 port, u32 flags, int ifindex)
3420 {
3421         struct socket *sock;
3422         struct udp_port_cfg udp_conf;
3423         int err;
3424
3425         memset(&udp_conf, 0, sizeof(udp_conf));
3426
3427         if (ipv6) {
3428                 udp_conf.family = AF_INET6;
3429                 udp_conf.use_udp6_rx_checksums =
3430                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
3431                 udp_conf.ipv6_v6only = 1;
3432         } else {
3433                 udp_conf.family = AF_INET;
3434         }
3435
3436         udp_conf.local_udp_port = port;
3437         udp_conf.bind_ifindex = ifindex;
3438
3439         /* Open UDP socket */
3440         err = udp_sock_create(net, &udp_conf, &sock);
3441         if (err < 0)
3442                 return ERR_PTR(err);
3443
3444         return sock;
3445 }
3446
3447 /* Create new listen socket if needed */
3448 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
3449                                               __be16 port, u32 flags,
3450                                               int ifindex)
3451 {
3452         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3453         struct vxlan_sock *vs;
3454         struct socket *sock;
3455         unsigned int h;
3456         struct udp_tunnel_sock_cfg tunnel_cfg;
3457
3458         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
3459         if (!vs)
3460                 return ERR_PTR(-ENOMEM);
3461
3462         for (h = 0; h < VNI_HASH_SIZE; ++h)
3463                 INIT_HLIST_HEAD(&vs->vni_list[h]);
3464
3465         sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
3466         if (IS_ERR(sock)) {
3467                 kfree(vs);
3468                 return ERR_CAST(sock);
3469         }
3470
3471         vs->sock = sock;
3472         refcount_set(&vs->refcnt, 1);
3473         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
3474
3475         spin_lock(&vn->sock_lock);
3476         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
3477         udp_tunnel_notify_add_rx_port(sock,
3478                                       (vs->flags & VXLAN_F_GPE) ?
3479                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
3480                                       UDP_TUNNEL_TYPE_VXLAN);
3481         spin_unlock(&vn->sock_lock);
3482
3483         /* Mark socket as an encapsulation socket. */
3484         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
3485         tunnel_cfg.sk_user_data = vs;
3486         tunnel_cfg.encap_type = 1;
3487         tunnel_cfg.encap_rcv = vxlan_rcv;
3488         tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
3489         tunnel_cfg.encap_destroy = NULL;
3490         tunnel_cfg.gro_receive = vxlan_gro_receive;
3491         tunnel_cfg.gro_complete = vxlan_gro_complete;
3492
3493         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
3494
3495         return vs;
3496 }
3497
3498 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
3499 {
3500         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3501         struct vxlan_sock *vs = NULL;
3502         struct vxlan_dev_node *node;
3503         int l3mdev_index = 0;
3504
3505         if (vxlan->cfg.remote_ifindex)
3506                 l3mdev_index = l3mdev_master_upper_ifindex_by_index(
3507                         vxlan->net, vxlan->cfg.remote_ifindex);
3508
3509         if (!vxlan->cfg.no_share) {
3510                 spin_lock(&vn->sock_lock);
3511                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
3512                                      vxlan->cfg.dst_port, vxlan->cfg.flags,
3513                                      l3mdev_index);
3514                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
3515                         spin_unlock(&vn->sock_lock);
3516                         return -EBUSY;
3517                 }
3518                 spin_unlock(&vn->sock_lock);
3519         }
3520         if (!vs)
3521                 vs = vxlan_socket_create(vxlan->net, ipv6,
3522                                          vxlan->cfg.dst_port, vxlan->cfg.flags,
3523                                          l3mdev_index);
3524         if (IS_ERR(vs))
3525                 return PTR_ERR(vs);
3526 #if IS_ENABLED(CONFIG_IPV6)
3527         if (ipv6) {
3528                 rcu_assign_pointer(vxlan->vn6_sock, vs);
3529                 node = &vxlan->hlist6;
3530         } else
3531 #endif
3532         {
3533                 rcu_assign_pointer(vxlan->vn4_sock, vs);
3534                 node = &vxlan->hlist4;
3535         }
3536         vxlan_vs_add_dev(vs, vxlan, node);
3537         return 0;
3538 }
3539
3540 static int vxlan_sock_add(struct vxlan_dev *vxlan)
3541 {
3542         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
3543         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
3544         bool ipv4 = !ipv6 || metadata;
3545         int ret = 0;
3546
3547         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
3548 #if IS_ENABLED(CONFIG_IPV6)
3549         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
3550         if (ipv6) {
3551                 ret = __vxlan_sock_add(vxlan, true);
3552                 if (ret < 0 && ret != -EAFNOSUPPORT)
3553                         ipv4 = false;
3554         }
3555 #endif
3556         if (ipv4)
3557                 ret = __vxlan_sock_add(vxlan, false);
3558         if (ret < 0)
3559                 vxlan_sock_release(vxlan);
3560         return ret;
3561 }
3562
3563 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
3564                                  struct net_device **lower,
3565                                  struct vxlan_dev *old,
3566                                  struct netlink_ext_ack *extack)
3567 {
3568         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
3569         struct vxlan_dev *tmp;
3570         bool use_ipv6 = false;
3571
3572         if (conf->flags & VXLAN_F_GPE) {
3573                 /* For now, allow GPE only together with
3574                  * COLLECT_METADATA. This can be relaxed later; in such
3575                  * case, the other side of the PtP link will have to be
3576                  * provided.
3577                  */
3578                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
3579                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3580                         NL_SET_ERR_MSG(extack,
3581                                        "VXLAN GPE does not support this combination of attributes");
3582                         return -EINVAL;
3583                 }
3584         }
3585
3586         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
3587                 /* Unless IPv6 is explicitly requested, assume IPv4 */
3588                 conf->remote_ip.sa.sa_family = AF_INET;
3589                 conf->saddr.sa.sa_family = AF_INET;
3590         } else if (!conf->remote_ip.sa.sa_family) {
3591                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
3592         } else if (!conf->saddr.sa.sa_family) {
3593                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
3594         }
3595
3596         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
3597                 NL_SET_ERR_MSG(extack,
3598                                "Local and remote address must be from the same family");
3599                 return -EINVAL;
3600         }
3601
3602         if (vxlan_addr_multicast(&conf->saddr)) {
3603                 NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
3604                 return -EINVAL;
3605         }
3606
3607         if (conf->saddr.sa.sa_family == AF_INET6) {
3608                 if (!IS_ENABLED(CONFIG_IPV6)) {
3609                         NL_SET_ERR_MSG(extack,
3610                                        "IPv6 support not enabled in the kernel");
3611                         return -EPFNOSUPPORT;
3612                 }
3613                 use_ipv6 = true;
3614                 conf->flags |= VXLAN_F_IPV6;
3615
3616                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
3617                         int local_type =
3618                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
3619                         int remote_type =
3620                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
3621
3622                         if (local_type & IPV6_ADDR_LINKLOCAL) {
3623                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
3624                                     (remote_type != IPV6_ADDR_ANY)) {
3625                                         NL_SET_ERR_MSG(extack,
3626                                                        "Invalid combination of local and remote address scopes");
3627                                         return -EINVAL;
3628                                 }
3629
3630                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
3631                         } else {
3632                                 if (remote_type ==
3633                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
3634                                         NL_SET_ERR_MSG(extack,
3635                                                        "Invalid combination of local and remote address scopes");
3636                                         return -EINVAL;
3637                                 }
3638
3639                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
3640                         }
3641                 }
3642         }
3643
3644         if (conf->label && !use_ipv6) {
3645                 NL_SET_ERR_MSG(extack,
3646                                "Label attribute only applies to IPv6 VXLAN devices");
3647                 return -EINVAL;
3648         }
3649
3650         if (conf->remote_ifindex) {
3651                 struct net_device *lowerdev;
3652
3653                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
3654                 if (!lowerdev) {
3655                         NL_SET_ERR_MSG(extack,
3656                                        "Invalid local interface, device not found");
3657                         return -ENODEV;
3658                 }
3659
3660 #if IS_ENABLED(CONFIG_IPV6)
3661                 if (use_ipv6) {
3662                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
3663                         if (idev && idev->cnf.disable_ipv6) {
3664                                 NL_SET_ERR_MSG(extack,
3665                                                "IPv6 support disabled by administrator");
3666                                 return -EPERM;
3667                         }
3668                 }
3669 #endif
3670
3671                 *lower = lowerdev;
3672         } else {
3673                 if (vxlan_addr_multicast(&conf->remote_ip)) {
3674                         NL_SET_ERR_MSG(extack,
3675                                        "Local interface required for multicast remote destination");
3676
3677                         return -EINVAL;
3678                 }
3679
3680 #if IS_ENABLED(CONFIG_IPV6)
3681                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
3682                         NL_SET_ERR_MSG(extack,
3683                                        "Local interface required for link-local local/remote addresses");
3684                         return -EINVAL;
3685                 }
3686 #endif
3687
3688                 *lower = NULL;
3689         }
3690
3691         if (!conf->dst_port) {
3692                 if (conf->flags & VXLAN_F_GPE)
3693                         conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3694                 else
3695                         conf->dst_port = htons(vxlan_port);
3696         }
3697
3698         if (!conf->age_interval)
3699                 conf->age_interval = FDB_AGE_DEFAULT;
3700
3701         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3702                 if (tmp == old)
3703                         continue;
3704
3705                 if (tmp->cfg.vni != conf->vni)
3706                         continue;
3707                 if (tmp->cfg.dst_port != conf->dst_port)
3708                         continue;
3709                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3710                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3711                         continue;
3712
3713                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3714                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3715                         continue;
3716
3717                 NL_SET_ERR_MSG(extack,
3718                                "A VXLAN device with the specified VNI already exists");
3719                 return -EEXIST;
3720         }
3721
3722         return 0;
3723 }
3724
3725 static void vxlan_config_apply(struct net_device *dev,
3726                                struct vxlan_config *conf,
3727                                struct net_device *lowerdev,
3728                                struct net *src_net,
3729                                bool changelink)
3730 {
3731         struct vxlan_dev *vxlan = netdev_priv(dev);
3732         struct vxlan_rdst *dst = &vxlan->default_dst;
3733         unsigned short needed_headroom = ETH_HLEN;
3734         bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3735         int max_mtu = ETH_MAX_MTU;
3736
3737         if (!changelink) {
3738                 if (conf->flags & VXLAN_F_GPE)
3739                         vxlan_raw_setup(dev);
3740                 else
3741                         vxlan_ether_setup(dev);
3742
3743                 if (conf->mtu)
3744                         dev->mtu = conf->mtu;
3745
3746                 vxlan->net = src_net;
3747         }
3748
3749         dst->remote_vni = conf->vni;
3750
3751         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3752
3753         if (lowerdev) {
3754                 dst->remote_ifindex = conf->remote_ifindex;
3755
3756                 dev->gso_max_size = lowerdev->gso_max_size;
3757                 dev->gso_max_segs = lowerdev->gso_max_segs;
3758
3759                 needed_headroom = lowerdev->hard_header_len;
3760
3761                 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3762                                            VXLAN_HEADROOM);
3763                 if (max_mtu < ETH_MIN_MTU)
3764                         max_mtu = ETH_MIN_MTU;
3765
3766                 if (!changelink && !conf->mtu)
3767                         dev->mtu = max_mtu;
3768         }
3769
3770         if (dev->mtu > max_mtu)
3771                 dev->mtu = max_mtu;
3772
3773         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3774                 needed_headroom += VXLAN6_HEADROOM;
3775         else
3776                 needed_headroom += VXLAN_HEADROOM;
3777         dev->needed_headroom = needed_headroom;
3778
3779         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3780 }
3781
3782 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3783                                struct vxlan_config *conf, bool changelink,
3784                                struct netlink_ext_ack *extack)
3785 {
3786         struct vxlan_dev *vxlan = netdev_priv(dev);
3787         struct net_device *lowerdev;
3788         int ret;
3789
3790         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
3791         if (ret)
3792                 return ret;
3793
3794         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3795
3796         return 0;
3797 }
3798
3799 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3800                               struct vxlan_config *conf,
3801                               struct netlink_ext_ack *extack)
3802 {
3803         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3804         struct vxlan_dev *vxlan = netdev_priv(dev);
3805         struct net_device *remote_dev = NULL;
3806         struct vxlan_fdb *f = NULL;
3807         bool unregister = false;
3808         struct vxlan_rdst *dst;
3809         int err;
3810
3811         dst = &vxlan->default_dst;
3812         err = vxlan_dev_configure(net, dev, conf, false, extack);
3813         if (err)
3814                 return err;
3815
3816         dev->ethtool_ops = &vxlan_ethtool_ops;
3817
3818         /* create an fdb entry for a valid default destination */
3819         if (!vxlan_addr_any(&dst->remote_ip)) {
3820                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3821                                        &dst->remote_ip,
3822                                        NUD_REACHABLE | NUD_PERMANENT,
3823                                        vxlan->cfg.dst_port,
3824                                        dst->remote_vni,
3825                                        dst->remote_vni,
3826                                        dst->remote_ifindex,
3827                                        NTF_SELF, 0, &f, extack);
3828                 if (err)
3829                         return err;
3830         }
3831
3832         err = register_netdevice(dev);
3833         if (err)
3834                 goto errout;
3835         unregister = true;
3836
3837         if (dst->remote_ifindex) {
3838                 remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
3839                 if (!remote_dev)
3840                         goto errout;
3841
3842                 err = netdev_upper_dev_link(remote_dev, dev, extack);
3843                 if (err)
3844                         goto errout;
3845         }
3846
3847         err = rtnl_configure_link(dev, NULL);
3848         if (err)
3849                 goto unlink;
3850
3851         if (f) {
3852                 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
3853
3854                 /* notify default fdb entry */
3855                 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
3856                                        RTM_NEWNEIGH, true, extack);
3857                 if (err) {
3858                         vxlan_fdb_destroy(vxlan, f, false, false);
3859                         if (remote_dev)
3860                                 netdev_upper_dev_unlink(remote_dev, dev);
3861                         goto unregister;
3862                 }
3863         }
3864
3865         list_add(&vxlan->next, &vn->vxlan_list);
3866         if (remote_dev)
3867                 dst->remote_dev = remote_dev;
3868         return 0;
3869 unlink:
3870         if (remote_dev)
3871                 netdev_upper_dev_unlink(remote_dev, dev);
3872 errout:
3873         /* unregister_netdevice() destroys the default FDB entry with deletion
3874          * notification. But the addition notification was not sent yet, so
3875          * destroy the entry by hand here.
3876          */
3877         if (f)
3878                 __vxlan_fdb_free(f);
3879 unregister:
3880         if (unregister)
3881                 unregister_netdevice(dev);
3882         return err;
3883 }
3884
3885 /* Set/clear flags based on attribute */
3886 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
3887                           int attrtype, unsigned long mask, bool changelink,
3888                           bool changelink_supported,
3889                           struct netlink_ext_ack *extack)
3890 {
3891         unsigned long flags;
3892
3893         if (!tb[attrtype])
3894                 return 0;
3895
3896         if (changelink && !changelink_supported) {
3897                 vxlan_flag_attr_error(attrtype, extack);
3898                 return -EOPNOTSUPP;
3899         }
3900
3901         if (vxlan_policy[attrtype].type == NLA_FLAG)
3902                 flags = conf->flags | mask;
3903         else if (nla_get_u8(tb[attrtype]))
3904                 flags = conf->flags | mask;
3905         else
3906                 flags = conf->flags & ~mask;
3907
3908         conf->flags = flags;
3909
3910         return 0;
3911 }
3912
3913 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3914                          struct net_device *dev, struct vxlan_config *conf,
3915                          bool changelink, struct netlink_ext_ack *extack)
3916 {
3917         struct vxlan_dev *vxlan = netdev_priv(dev);
3918         int err = 0;
3919
3920         memset(conf, 0, sizeof(*conf));
3921
3922         /* if changelink operation, start with old existing cfg */
3923         if (changelink)
3924                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3925
3926         if (data[IFLA_VXLAN_ID]) {
3927                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3928
3929                 if (changelink && (vni != conf->vni)) {
3930                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
3931                         return -EOPNOTSUPP;
3932                 }
3933                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3934         }
3935
3936         if (data[IFLA_VXLAN_GROUP]) {
3937                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
3938                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
3939                         return -EOPNOTSUPP;
3940                 }
3941
3942                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3943                 conf->remote_ip.sa.sa_family = AF_INET;
3944         } else if (data[IFLA_VXLAN_GROUP6]) {
3945                 if (!IS_ENABLED(CONFIG_IPV6)) {
3946                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
3947                         return -EPFNOSUPPORT;
3948                 }
3949
3950                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
3951                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
3952                         return -EOPNOTSUPP;
3953                 }
3954
3955                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3956                 conf->remote_ip.sa.sa_family = AF_INET6;
3957         }
3958
3959         if (data[IFLA_VXLAN_LOCAL]) {
3960                 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
3961                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
3962                         return -EOPNOTSUPP;
3963                 }
3964
3965                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3966                 conf->saddr.sa.sa_family = AF_INET;
3967         } else if (data[IFLA_VXLAN_LOCAL6]) {
3968                 if (!IS_ENABLED(CONFIG_IPV6)) {
3969                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
3970                         return -EPFNOSUPPORT;
3971                 }
3972
3973                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
3974                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
3975                         return -EOPNOTSUPP;
3976                 }
3977
3978                 /* TODO: respect scope id */
3979                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3980                 conf->saddr.sa.sa_family = AF_INET6;
3981         }
3982
3983         if (data[IFLA_VXLAN_LINK])
3984                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3985
3986         if (data[IFLA_VXLAN_TOS])
3987                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3988
3989         if (data[IFLA_VXLAN_TTL])
3990                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3991
3992         if (data[IFLA_VXLAN_TTL_INHERIT]) {
3993                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
3994                                     VXLAN_F_TTL_INHERIT, changelink, false,
3995                                     extack);
3996                 if (err)
3997                         return err;
3998
3999         }
4000
4001         if (data[IFLA_VXLAN_LABEL])
4002                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
4003                              IPV6_FLOWLABEL_MASK;
4004
4005         if (data[IFLA_VXLAN_LEARNING]) {
4006                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
4007                                     VXLAN_F_LEARN, changelink, true,
4008                                     extack);
4009                 if (err)
4010                         return err;
4011         } else if (!changelink) {
4012                 /* default to learn on a new device */
4013                 conf->flags |= VXLAN_F_LEARN;
4014         }
4015
4016         if (data[IFLA_VXLAN_AGEING])
4017                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
4018
4019         if (data[IFLA_VXLAN_PROXY]) {
4020                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
4021                                     VXLAN_F_PROXY, changelink, false,
4022                                     extack);
4023                 if (err)
4024                         return err;
4025         }
4026
4027         if (data[IFLA_VXLAN_RSC]) {
4028                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
4029                                     VXLAN_F_RSC, changelink, false,
4030                                     extack);
4031                 if (err)
4032                         return err;
4033         }
4034
4035         if (data[IFLA_VXLAN_L2MISS]) {
4036                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
4037                                     VXLAN_F_L2MISS, changelink, false,
4038                                     extack);
4039                 if (err)
4040                         return err;
4041         }
4042
4043         if (data[IFLA_VXLAN_L3MISS]) {
4044                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
4045                                     VXLAN_F_L3MISS, changelink, false,
4046                                     extack);
4047                 if (err)
4048                         return err;
4049         }
4050
4051         if (data[IFLA_VXLAN_LIMIT]) {
4052                 if (changelink) {
4053                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
4054                                             "Cannot change limit");
4055                         return -EOPNOTSUPP;
4056                 }
4057                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
4058         }
4059
4060         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
4061                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
4062                                     VXLAN_F_COLLECT_METADATA, changelink, false,
4063                                     extack);
4064                 if (err)
4065                         return err;
4066         }
4067
4068         if (data[IFLA_VXLAN_PORT_RANGE]) {
4069                 if (!changelink) {
4070                         const struct ifla_vxlan_port_range *p
4071                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
4072                         conf->port_min = ntohs(p->low);
4073                         conf->port_max = ntohs(p->high);
4074                 } else {
4075                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
4076                                             "Cannot change port range");
4077                         return -EOPNOTSUPP;
4078                 }
4079         }
4080
4081         if (data[IFLA_VXLAN_PORT]) {
4082                 if (changelink) {
4083                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
4084                                             "Cannot change port");
4085                         return -EOPNOTSUPP;
4086                 }
4087                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
4088         }
4089
4090         if (data[IFLA_VXLAN_UDP_CSUM]) {
4091                 if (changelink) {
4092                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
4093                                             "Cannot change UDP_CSUM flag");
4094                         return -EOPNOTSUPP;
4095                 }
4096                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
4097                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
4098         }
4099
4100         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
4101                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4102                                     VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
4103                                     false, extack);
4104                 if (err)
4105                         return err;
4106         }
4107
4108         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
4109                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4110                                     VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
4111                                     false, extack);
4112                 if (err)
4113                         return err;
4114         }
4115
4116         if (data[IFLA_VXLAN_REMCSUM_TX]) {
4117                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
4118                                     VXLAN_F_REMCSUM_TX, changelink, false,
4119                                     extack);
4120                 if (err)
4121                         return err;
4122         }
4123
4124         if (data[IFLA_VXLAN_REMCSUM_RX]) {
4125                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
4126                                     VXLAN_F_REMCSUM_RX, changelink, false,
4127                                     extack);
4128                 if (err)
4129                         return err;
4130         }
4131
4132         if (data[IFLA_VXLAN_GBP]) {
4133                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
4134                                     VXLAN_F_GBP, changelink, false, extack);
4135                 if (err)
4136                         return err;
4137         }
4138
4139         if (data[IFLA_VXLAN_GPE]) {
4140                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
4141                                     VXLAN_F_GPE, changelink, false,
4142                                     extack);
4143                 if (err)
4144                         return err;
4145         }
4146
4147         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
4148                 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
4149                                     VXLAN_F_REMCSUM_NOPARTIAL, changelink,
4150                                     false, extack);
4151                 if (err)
4152                         return err;
4153         }
4154
4155         if (tb[IFLA_MTU]) {
4156                 if (changelink) {
4157                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
4158                                             "Cannot change mtu");
4159                         return -EOPNOTSUPP;
4160                 }
4161                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
4162         }
4163
4164         if (data[IFLA_VXLAN_DF])
4165                 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
4166
4167         return 0;
4168 }
4169
4170 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
4171                          struct nlattr *tb[], struct nlattr *data[],
4172                          struct netlink_ext_ack *extack)
4173 {
4174         struct vxlan_config conf;
4175         int err;
4176
4177         err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
4178         if (err)
4179                 return err;
4180
4181         return __vxlan_dev_create(src_net, dev, &conf, extack);
4182 }
4183
4184 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
4185                             struct nlattr *data[],
4186                             struct netlink_ext_ack *extack)
4187 {
4188         struct vxlan_dev *vxlan = netdev_priv(dev);
4189         struct net_device *lowerdev;
4190         struct vxlan_config conf;
4191         struct vxlan_rdst *dst;
4192         int err;
4193
4194         dst = &vxlan->default_dst;
4195         err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
4196         if (err)
4197                 return err;
4198
4199         err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
4200                                     vxlan, extack);
4201         if (err)
4202                 return err;
4203
4204         if (dst->remote_dev == lowerdev)
4205                 lowerdev = NULL;
4206
4207         err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
4208                                              extack);
4209         if (err)
4210                 return err;
4211
4212         /* handle default dst entry */
4213         if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
4214                 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
4215
4216                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4217                 if (!vxlan_addr_any(&conf.remote_ip)) {
4218                         err = vxlan_fdb_update(vxlan, all_zeros_mac,
4219                                                &conf.remote_ip,
4220                                                NUD_REACHABLE | NUD_PERMANENT,
4221                                                NLM_F_APPEND | NLM_F_CREATE,
4222                                                vxlan->cfg.dst_port,
4223                                                conf.vni, conf.vni,
4224                                                conf.remote_ifindex,
4225                                                NTF_SELF, 0, true, extack);
4226                         if (err) {
4227                                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4228                                 netdev_adjacent_change_abort(dst->remote_dev,
4229                                                              lowerdev, dev);
4230                                 return err;
4231                         }
4232                 }
4233                 if (!vxlan_addr_any(&dst->remote_ip))
4234                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
4235                                            dst->remote_ip,
4236                                            vxlan->cfg.dst_port,
4237                                            dst->remote_vni,
4238                                            dst->remote_vni,
4239                                            dst->remote_ifindex,
4240                                            true);
4241                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4242         }
4243
4244         if (conf.age_interval != vxlan->cfg.age_interval)
4245                 mod_timer(&vxlan->age_timer, jiffies);
4246
4247         netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
4248         if (lowerdev && lowerdev != dst->remote_dev) {
4249                 dst->remote_dev = lowerdev;
4250                 netdev_update_lockdep_key(lowerdev);
4251         }
4252         vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
4253         return 0;
4254 }
4255
4256 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
4257 {
4258         struct vxlan_dev *vxlan = netdev_priv(dev);
4259
4260         vxlan_flush(vxlan, true);
4261
4262         list_del(&vxlan->next);
4263         unregister_netdevice_queue(dev, head);
4264         if (vxlan->default_dst.remote_dev)
4265                 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
4266 }
4267
4268 static size_t vxlan_get_size(const struct net_device *dev)
4269 {
4270
4271         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
4272                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
4273                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
4274                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
4275                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
4276                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL_INHERIT */
4277                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
4278                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_DF */
4279                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
4280                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
4281                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
4282                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
4283                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
4284                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
4285                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
4286                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
4287                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
4288                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
4289                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
4290                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
4291                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
4292                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
4293                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
4294                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
4295                 0;
4296 }
4297
4298 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
4299 {
4300         const struct vxlan_dev *vxlan = netdev_priv(dev);
4301         const struct vxlan_rdst *dst = &vxlan->default_dst;
4302         struct ifla_vxlan_port_range ports = {
4303                 .low =  htons(vxlan->cfg.port_min),
4304                 .high = htons(vxlan->cfg.port_max),
4305         };
4306
4307         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
4308                 goto nla_put_failure;
4309
4310         if (!vxlan_addr_any(&dst->remote_ip)) {
4311                 if (dst->remote_ip.sa.sa_family == AF_INET) {
4312                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
4313                                             dst->remote_ip.sin.sin_addr.s_addr))
4314                                 goto nla_put_failure;
4315 #if IS_ENABLED(CONFIG_IPV6)
4316                 } else {
4317                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
4318                                              &dst->remote_ip.sin6.sin6_addr))
4319                                 goto nla_put_failure;
4320 #endif
4321                 }
4322         }
4323
4324         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
4325                 goto nla_put_failure;
4326
4327         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
4328                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
4329                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
4330                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
4331                                 goto nla_put_failure;
4332 #if IS_ENABLED(CONFIG_IPV6)
4333                 } else {
4334                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
4335                                              &vxlan->cfg.saddr.sin6.sin6_addr))
4336                                 goto nla_put_failure;
4337 #endif
4338                 }
4339         }
4340
4341         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
4342             nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
4343                        !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
4344             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
4345             nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
4346             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
4347             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
4348                        !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
4349             nla_put_u8(skb, IFLA_VXLAN_PROXY,
4350                        !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
4351             nla_put_u8(skb, IFLA_VXLAN_RSC,
4352                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
4353             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
4354                        !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
4355             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
4356                        !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
4357             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
4358                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
4359             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
4360             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
4361             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
4362             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
4363                        !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
4364             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
4365                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
4366             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
4367                        !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
4368             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
4369                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
4370             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
4371                        !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
4372                 goto nla_put_failure;
4373
4374         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
4375                 goto nla_put_failure;
4376
4377         if (vxlan->cfg.flags & VXLAN_F_GBP &&
4378             nla_put_flag(skb, IFLA_VXLAN_GBP))
4379                 goto nla_put_failure;
4380
4381         if (vxlan->cfg.flags & VXLAN_F_GPE &&
4382             nla_put_flag(skb, IFLA_VXLAN_GPE))
4383                 goto nla_put_failure;
4384
4385         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
4386             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
4387                 goto nla_put_failure;
4388
4389         return 0;
4390
4391 nla_put_failure:
4392         return -EMSGSIZE;
4393 }
4394
4395 static struct net *vxlan_get_link_net(const struct net_device *dev)
4396 {
4397         struct vxlan_dev *vxlan = netdev_priv(dev);
4398
4399         return vxlan->net;
4400 }
4401
4402 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
4403         .kind           = "vxlan",
4404         .maxtype        = IFLA_VXLAN_MAX,
4405         .policy         = vxlan_policy,
4406         .priv_size      = sizeof(struct vxlan_dev),
4407         .setup          = vxlan_setup,
4408         .validate       = vxlan_validate,
4409         .newlink        = vxlan_newlink,
4410         .changelink     = vxlan_changelink,
4411         .dellink        = vxlan_dellink,
4412         .get_size       = vxlan_get_size,
4413         .fill_info      = vxlan_fill_info,
4414         .get_link_net   = vxlan_get_link_net,
4415 };
4416
4417 struct net_device *vxlan_dev_create(struct net *net, const char *name,
4418                                     u8 name_assign_type,
4419                                     struct vxlan_config *conf)
4420 {
4421         struct nlattr *tb[IFLA_MAX + 1];
4422         struct net_device *dev;
4423         int err;
4424
4425         memset(&tb, 0, sizeof(tb));
4426
4427         dev = rtnl_create_link(net, name, name_assign_type,
4428                                &vxlan_link_ops, tb, NULL);
4429         if (IS_ERR(dev))
4430                 return dev;
4431
4432         err = __vxlan_dev_create(net, dev, conf, NULL);
4433         if (err < 0) {
4434                 free_netdev(dev);
4435                 return ERR_PTR(err);
4436         }
4437
4438         err = rtnl_configure_link(dev, NULL);
4439         if (err < 0) {
4440                 LIST_HEAD(list_kill);
4441
4442                 vxlan_dellink(dev, &list_kill);
4443                 unregister_netdevice_many(&list_kill);
4444                 return ERR_PTR(err);
4445         }
4446
4447         return dev;
4448 }
4449 EXPORT_SYMBOL_GPL(vxlan_dev_create);
4450
4451 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
4452                                              struct net_device *dev)
4453 {
4454         struct vxlan_dev *vxlan, *next;
4455         LIST_HEAD(list_kill);
4456
4457         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4458                 struct vxlan_rdst *dst = &vxlan->default_dst;
4459
4460                 /* In case we created vxlan device with carrier
4461                  * and we loose the carrier due to module unload
4462                  * we also need to remove vxlan device. In other
4463                  * cases, it's not necessary and remote_ifindex
4464                  * is 0 here, so no matches.
4465                  */
4466                 if (dst->remote_ifindex == dev->ifindex)
4467                         vxlan_dellink(vxlan->dev, &list_kill);
4468         }
4469
4470         unregister_netdevice_many(&list_kill);
4471 }
4472
4473 static int vxlan_netdevice_event(struct notifier_block *unused,
4474                                  unsigned long event, void *ptr)
4475 {
4476         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4477         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
4478
4479         if (event == NETDEV_UNREGISTER) {
4480                 vxlan_offload_rx_ports(dev, false);
4481                 vxlan_handle_lowerdev_unregister(vn, dev);
4482         } else if (event == NETDEV_REGISTER) {
4483                 vxlan_offload_rx_ports(dev, true);
4484         } else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
4485                    event == NETDEV_UDP_TUNNEL_DROP_INFO) {
4486                 vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
4487         }
4488
4489         return NOTIFY_DONE;
4490 }
4491
4492 static struct notifier_block vxlan_notifier_block __read_mostly = {
4493         .notifier_call = vxlan_netdevice_event,
4494 };
4495
4496 static void
4497 vxlan_fdb_offloaded_set(struct net_device *dev,
4498                         struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4499 {
4500         struct vxlan_dev *vxlan = netdev_priv(dev);
4501         struct vxlan_rdst *rdst;
4502         struct vxlan_fdb *f;
4503         u32 hash_index;
4504
4505         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4506
4507         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4508
4509         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4510         if (!f)
4511                 goto out;
4512
4513         rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
4514                                    fdb_info->remote_port,
4515                                    fdb_info->remote_vni,
4516                                    fdb_info->remote_ifindex);
4517         if (!rdst)
4518                 goto out;
4519
4520         rdst->offloaded = fdb_info->offloaded;
4521
4522 out:
4523         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4524 }
4525
4526 static int
4527 vxlan_fdb_external_learn_add(struct net_device *dev,
4528                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4529 {
4530         struct vxlan_dev *vxlan = netdev_priv(dev);
4531         struct netlink_ext_ack *extack;
4532         u32 hash_index;
4533         int err;
4534
4535         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4536         extack = switchdev_notifier_info_to_extack(&fdb_info->info);
4537
4538         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4539         err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
4540                                NUD_REACHABLE,
4541                                NLM_F_CREATE | NLM_F_REPLACE,
4542                                fdb_info->remote_port,
4543                                fdb_info->vni,
4544                                fdb_info->remote_vni,
4545                                fdb_info->remote_ifindex,
4546                                NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
4547                                0, false, extack);
4548         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4549
4550         return err;
4551 }
4552
4553 static int
4554 vxlan_fdb_external_learn_del(struct net_device *dev,
4555                              struct switchdev_notifier_vxlan_fdb_info *fdb_info)
4556 {
4557         struct vxlan_dev *vxlan = netdev_priv(dev);
4558         struct vxlan_fdb *f;
4559         u32 hash_index;
4560         int err = 0;
4561
4562         hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
4563         spin_lock_bh(&vxlan->hash_lock[hash_index]);
4564
4565         f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
4566         if (!f)
4567                 err = -ENOENT;
4568         else if (f->flags & NTF_EXT_LEARNED)
4569                 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
4570                                          fdb_info->remote_ip,
4571                                          fdb_info->remote_port,
4572                                          fdb_info->vni,
4573                                          fdb_info->remote_vni,
4574                                          fdb_info->remote_ifindex,
4575                                          false);
4576
4577         spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4578
4579         return err;
4580 }
4581
4582 static int vxlan_switchdev_event(struct notifier_block *unused,
4583                                  unsigned long event, void *ptr)
4584 {
4585         struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
4586         struct switchdev_notifier_vxlan_fdb_info *fdb_info;
4587         int err = 0;
4588
4589         switch (event) {
4590         case SWITCHDEV_VXLAN_FDB_OFFLOADED:
4591                 vxlan_fdb_offloaded_set(dev, ptr);
4592                 break;
4593         case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
4594                 fdb_info = ptr;
4595                 err = vxlan_fdb_external_learn_add(dev, fdb_info);
4596                 if (err) {
4597                         err = notifier_from_errno(err);
4598                         break;
4599                 }
4600                 fdb_info->offloaded = true;
4601                 vxlan_fdb_offloaded_set(dev, fdb_info);
4602                 break;
4603         case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
4604                 fdb_info = ptr;
4605                 err = vxlan_fdb_external_learn_del(dev, fdb_info);
4606                 if (err) {
4607                         err = notifier_from_errno(err);
4608                         break;
4609                 }
4610                 fdb_info->offloaded = false;
4611                 vxlan_fdb_offloaded_set(dev, fdb_info);
4612                 break;
4613         }
4614
4615         return err;
4616 }
4617
4618 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
4619         .notifier_call = vxlan_switchdev_event,
4620 };
4621
4622 static void vxlan_fdb_nh_flush(struct nexthop *nh)
4623 {
4624         struct vxlan_fdb *fdb;
4625         struct vxlan_dev *vxlan;
4626         u32 hash_index;
4627
4628         rcu_read_lock();
4629         list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
4630                 vxlan = rcu_dereference(fdb->vdev);
4631                 WARN_ON(!vxlan);
4632                 hash_index = fdb_head_index(vxlan, fdb->eth_addr,
4633                                             vxlan->default_dst.remote_vni);
4634                 spin_lock_bh(&vxlan->hash_lock[hash_index]);
4635                 if (!hlist_unhashed(&fdb->hlist))
4636                         vxlan_fdb_destroy(vxlan, fdb, false, false);
4637                 spin_unlock_bh(&vxlan->hash_lock[hash_index]);
4638         }
4639         rcu_read_unlock();
4640 }
4641
4642 static int vxlan_nexthop_event(struct notifier_block *nb,
4643                                unsigned long event, void *ptr)
4644 {
4645         struct nexthop *nh = ptr;
4646
4647         if (!nh || event != NEXTHOP_EVENT_DEL)
4648                 return NOTIFY_DONE;
4649
4650         vxlan_fdb_nh_flush(nh);
4651
4652         return NOTIFY_DONE;
4653 }
4654
4655 static struct notifier_block vxlan_nexthop_notifier_block __read_mostly = {
4656         .notifier_call = vxlan_nexthop_event,
4657 };
4658
4659 static __net_init int vxlan_init_net(struct net *net)
4660 {
4661         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4662         unsigned int h;
4663
4664         INIT_LIST_HEAD(&vn->vxlan_list);
4665         spin_lock_init(&vn->sock_lock);
4666
4667         for (h = 0; h < PORT_HASH_SIZE; ++h)
4668                 INIT_HLIST_HEAD(&vn->sock_list[h]);
4669
4670         return register_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
4671 }
4672
4673 static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
4674 {
4675         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
4676         struct vxlan_dev *vxlan, *next;
4677         struct net_device *dev, *aux;
4678         unsigned int h;
4679
4680         for_each_netdev_safe(net, dev, aux)
4681                 if (dev->rtnl_link_ops == &vxlan_link_ops)
4682                         unregister_netdevice_queue(dev, head);
4683
4684         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
4685                 /* If vxlan->dev is in the same netns, it has already been added
4686                  * to the list by the previous loop.
4687                  */
4688                 if (!net_eq(dev_net(vxlan->dev), net))
4689                         unregister_netdevice_queue(vxlan->dev, head);
4690         }
4691
4692         for (h = 0; h < PORT_HASH_SIZE; ++h)
4693                 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
4694 }
4695
4696 static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
4697 {
4698         struct net *net;
4699         LIST_HEAD(list);
4700
4701         rtnl_lock();
4702         list_for_each_entry(net, net_list, exit_list)
4703                 unregister_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
4704         list_for_each_entry(net, net_list, exit_list)
4705                 vxlan_destroy_tunnels(net, &list);
4706
4707         unregister_netdevice_many(&list);
4708         rtnl_unlock();
4709 }
4710
4711 static struct pernet_operations vxlan_net_ops = {
4712         .init = vxlan_init_net,
4713         .exit_batch = vxlan_exit_batch_net,
4714         .id   = &vxlan_net_id,
4715         .size = sizeof(struct vxlan_net),
4716 };
4717
4718 static int __init vxlan_init_module(void)
4719 {
4720         int rc;
4721
4722         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
4723
4724         rc = register_pernet_subsys(&vxlan_net_ops);
4725         if (rc)
4726                 goto out1;
4727
4728         rc = register_netdevice_notifier(&vxlan_notifier_block);
4729         if (rc)
4730                 goto out2;
4731
4732         rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
4733         if (rc)
4734                 goto out3;
4735
4736         rc = rtnl_link_register(&vxlan_link_ops);
4737         if (rc)
4738                 goto out4;
4739
4740         return 0;
4741 out4:
4742         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4743 out3:
4744         unregister_netdevice_notifier(&vxlan_notifier_block);
4745 out2:
4746         unregister_pernet_subsys(&vxlan_net_ops);
4747 out1:
4748         return rc;
4749 }
4750 late_initcall(vxlan_init_module);
4751
4752 static void __exit vxlan_cleanup_module(void)
4753 {
4754         rtnl_link_unregister(&vxlan_link_ops);
4755         unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
4756         unregister_netdevice_notifier(&vxlan_notifier_block);
4757         unregister_pernet_subsys(&vxlan_net_ops);
4758         /* rcu_barrier() is called by netns */
4759 }
4760 module_exit(vxlan_cleanup_module);
4761
4762 MODULE_LICENSE("GPL");
4763 MODULE_VERSION(VXLAN_VERSION);
4764 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
4765 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
4766 MODULE_ALIAS_RTNL_LINK("vxlan");