drivers/net/geneve.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * GENEVE: Generic Network Virtualization Encapsulation
   4  *
   5  * Copyright (c) 2015 Red Hat, Inc.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/ethtool.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/hash.h>
  15 #include <net/ipv6_stubs.h>
  16 #include <net/dst_metadata.h>
  17 #include <net/gro_cells.h>
  18 #include <net/rtnetlink.h>
  19 #include <net/geneve.h>
  20 #include <net/gro.h>
  21 #include <net/protocol.h>
  22
  23 #define GENEVE_NETDEV_VER       "0.6"
  24
  25 #define GENEVE_N_VID            (1u << 24)
  26 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  27
  28 #define VNI_HASH_BITS           10
  29 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  30
  31 static bool log_ecn_error = true;
  32 module_param(log_ecn_error, bool, 0644);
  33 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  34
  35 #define GENEVE_VER 0
  36 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  37 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  38 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  39
  40 /* per-network namespace private data for this module */
  41 struct geneve_net {
  42         struct list_head        geneve_list;
  43         struct list_head        sock_list;
  44 };
  45
  46 static unsigned int geneve_net_id;
  47
  48 struct geneve_dev_node {
  49         struct hlist_node hlist;
  50         struct geneve_dev *geneve;
  51 };
  52
  53 struct geneve_config {
  54         struct ip_tunnel_info   info;
  55         bool                    collect_md;
  56         bool                    use_udp6_rx_checksums;
  57         bool                    ttl_inherit;
  58         enum ifla_geneve_df     df;
  59         bool                    inner_proto_inherit;
  60 };
  61
  62 /* Pseudo network device */
  63 struct geneve_dev {
  64         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  65 #if IS_ENABLED(CONFIG_IPV6)
  66         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  67 #endif
  68         struct net         *net;        /* netns for packet i/o */
  69         struct net_device  *dev;        /* netdev for geneve tunnel */
  70         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  71 #if IS_ENABLED(CONFIG_IPV6)
  72         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  73 #endif
  74         struct list_head   next;        /* geneve's per namespace list */
  75         struct gro_cells   gro_cells;
  76         struct geneve_config cfg;
  77 };
  78
  79 struct geneve_sock {
  80         bool                    collect_md;
  81         struct list_head        list;
  82         struct socket           *sock;
  83         struct rcu_head         rcu;
  84         int                     refcnt;
  85         struct hlist_head       vni_list[VNI_HASH_SIZE];
  86 };
  87
  88 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  89 {
  90         __u32 vnid;
  91
  92         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  93         return hash_32(vnid, VNI_HASH_BITS);
  94 }
  95
  96 static __be64 vni_to_tunnel_id(const __u8 *vni)
  97 {
  98 #ifdef __BIG_ENDIAN
  99         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
 100 #else
 101         return (__force __be64)(((__force u64)vni[0] << 40) |
 102                                 ((__force u64)vni[1] << 48) |
 103                                 ((__force u64)vni[2] << 56));
 104 #endif
 105 }
 106
 107 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 108 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 109 {
 110 #ifdef __BIG_ENDIAN
 111         vni[0] = (__force __u8)(tun_id >> 16);
 112         vni[1] = (__force __u8)(tun_id >> 8);
 113         vni[2] = (__force __u8)tun_id;
 114 #else
 115         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 116         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 117         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 118 #endif
 119 }
 120
 121 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 122 {
 123         return !memcmp(vni, &tun_id[5], 3);
 124 }
 125
 126 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 127 {
 128         return gs->sock->sk->sk_family;
 129 }
 130
 131 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 132                                         __be32 addr, u8 vni[])
 133 {
 134         struct hlist_head *vni_list_head;
 135         struct geneve_dev_node *node;
 136         __u32 hash;
 137
 138         /* Find the device for this VNI */
 139         hash = geneve_net_vni_hash(vni);
 140         vni_list_head = &gs->vni_list[hash];
 141         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 142                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 143                     addr == node->geneve->cfg.info.key.u.ipv4.dst)
 144                         return node->geneve;
 145         }
 146         return NULL;
 147 }
 148
 149 #if IS_ENABLED(CONFIG_IPV6)
 150 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 151                                          struct in6_addr addr6, u8 vni[])
 152 {
 153         struct hlist_head *vni_list_head;
 154         struct geneve_dev_node *node;
 155         __u32 hash;
 156
 157         /* Find the device for this VNI */
 158         hash = geneve_net_vni_hash(vni);
 159         vni_list_head = &gs->vni_list[hash];
 160         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 161                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 162                     ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
 163                         return node->geneve;
 164         }
 165         return NULL;
 166 }
 167 #endif
 168
 169 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 170 {
 171         return (struct genevehdr *)(udp_hdr(skb) + 1);
 172 }
 173
 174 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 175                                             struct sk_buff *skb)
 176 {
 177         static u8 zero_vni[3];
 178         u8 *vni;
 179
 180         if (geneve_get_sk_family(gs) == AF_INET) {
 181                 struct iphdr *iph;
 182                 __be32 addr;
 183
 184                 iph = ip_hdr(skb); /* outer IP header... */
 185
 186                 if (gs->collect_md) {
 187                         vni = zero_vni;
 188                         addr = 0;
 189                 } else {
 190                         vni = geneve_hdr(skb)->vni;
 191                         addr = iph->saddr;
 192                 }
 193
 194                 return geneve_lookup(gs, addr, vni);
 195 #if IS_ENABLED(CONFIG_IPV6)
 196         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 197                 static struct in6_addr zero_addr6;
 198                 struct ipv6hdr *ip6h;
 199                 struct in6_addr addr6;
 200
 201                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 202
 203                 if (gs->collect_md) {
 204                         vni = zero_vni;
 205                         addr6 = zero_addr6;
 206                 } else {
 207                         vni = geneve_hdr(skb)->vni;
 208                         addr6 = ip6h->saddr;
 209                 }
 210
 211                 return geneve6_lookup(gs, addr6, vni);
 212 #endif
 213         }
 214         return NULL;
 215 }
 216
 217 /* geneve receive/decap routine */
 218 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 219                       struct sk_buff *skb)
 220 {
 221         struct genevehdr *gnvh = geneve_hdr(skb);
 222         struct metadata_dst *tun_dst = NULL;
 223         unsigned int len;
 224         int nh, err = 0;
 225         void *oiph;
 226
 227         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 228                 __be16 flags;
 229
 230                 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
 231                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 232
 233                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 234                                          vni_to_tunnel_id(gnvh->vni),
 235                                          gnvh->opt_len * 4);
 236                 if (!tun_dst) {
 237                         DEV_STATS_INC(geneve->dev, rx_dropped);
 238                         goto drop;
 239                 }
 240                 /* Update tunnel dst according to Geneve options. */
 241                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 242                                         gnvh->options, gnvh->opt_len * 4,
 243                                         TUNNEL_GENEVE_OPT);
 244         } else {
 245                 /* Drop packets w/ critical options,
 246                  * since we don't support any...
 247                  */
 248                 if (gnvh->critical) {
 249                         DEV_STATS_INC(geneve->dev, rx_frame_errors);
 250                         DEV_STATS_INC(geneve->dev, rx_errors);
 251                         goto drop;
 252                 }
 253         }
 254
 255         if (tun_dst)
 256                 skb_dst_set(skb, &tun_dst->dst);
 257
 258         if (gnvh->proto_type == htons(ETH_P_TEB)) {
 259                 skb_reset_mac_header(skb);
 260                 skb->protocol = eth_type_trans(skb, geneve->dev);
 261                 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 262
 263                 /* Ignore packet loops (and multicast echo) */
 264                 if (ether_addr_equal(eth_hdr(skb)->h_source,
 265                                      geneve->dev->dev_addr)) {
 266                         DEV_STATS_INC(geneve->dev, rx_errors);
 267                         goto drop;
 268                 }
 269         } else {
 270                 skb_reset_mac_header(skb);
 271                 skb->dev = geneve->dev;
 272                 skb->pkt_type = PACKET_HOST;
 273         }
 274
 275         /* Save offset of outer header relative to skb->head,
 276          * because we are going to reset the network header to the inner header
 277          * and might change skb->head.
 278          */
 279         nh = skb_network_header(skb) - skb->head;
 280
 281         skb_reset_network_header(skb);
 282
 283         if (!pskb_inet_may_pull(skb)) {
 284                 DEV_STATS_INC(geneve->dev, rx_length_errors);
 285                 DEV_STATS_INC(geneve->dev, rx_errors);
 286                 goto drop;
 287         }
 288
 289         /* Get the outer header. */
 290         oiph = skb->head + nh;
 291
 292         if (geneve_get_sk_family(gs) == AF_INET)
 293                 err = IP_ECN_decapsulate(oiph, skb);
 294 #if IS_ENABLED(CONFIG_IPV6)
 295         else
 296                 err = IP6_ECN_decapsulate(oiph, skb);
 297 #endif
 298
 299         if (unlikely(err)) {
 300                 if (log_ecn_error) {
 301                         if (geneve_get_sk_family(gs) == AF_INET)
 302                                 net_info_ratelimited("non-ECT from %pI4 "
 303                                                      "with TOS=%#x\n",
 304                                                      &((struct iphdr *)oiph)->saddr,
 305                                                      ((struct iphdr *)oiph)->tos);
 306 #if IS_ENABLED(CONFIG_IPV6)
 307                         else
 308                                 net_info_ratelimited("non-ECT from %pI6\n",
 309                                                      &((struct ipv6hdr *)oiph)->saddr);
 310 #endif
 311                 }
 312                 if (err > 1) {
 313                         DEV_STATS_INC(geneve->dev, rx_frame_errors);
 314                         DEV_STATS_INC(geneve->dev, rx_errors);
 315                         goto drop;
 316                 }
 317         }
 318
 319         len = skb->len;
 320         err = gro_cells_receive(&geneve->gro_cells, skb);
 321         if (likely(err == NET_RX_SUCCESS))
 322                 dev_sw_netstats_rx_add(geneve->dev, len);
 323
 324         return;
 325 drop:
 326         /* Consume bad packet */
 327         kfree_skb(skb);
 328 }
 329
 330 /* Setup stats when device is created */
 331 static int geneve_init(struct net_device *dev)
 332 {
 333         struct geneve_dev *geneve = netdev_priv(dev);
 334         int err;
 335
 336         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 337         if (!dev->tstats)
 338                 return -ENOMEM;
 339
 340         err = gro_cells_init(&geneve->gro_cells, dev);
 341         if (err) {
 342                 free_percpu(dev->tstats);
 343                 return err;
 344         }
 345
 346         err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
 347         if (err) {
 348                 free_percpu(dev->tstats);
 349                 gro_cells_destroy(&geneve->gro_cells);
 350                 return err;
 351         }
 352         return 0;
 353 }
 354
 355 static void geneve_uninit(struct net_device *dev)
 356 {
 357         struct geneve_dev *geneve = netdev_priv(dev);
 358
 359         dst_cache_destroy(&geneve->cfg.info.dst_cache);
 360         gro_cells_destroy(&geneve->gro_cells);
 361         free_percpu(dev->tstats);
 362 }
 363
 364 /* Callback from net/ipv4/udp.c to receive packets */
 365 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 366 {
 367         struct genevehdr *geneveh;
 368         struct geneve_dev *geneve;
 369         struct geneve_sock *gs;
 370         __be16 inner_proto;
 371         int opts_len;
 372
 373         /* Need UDP and Geneve header to be present */
 374         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 375                 goto drop;
 376
 377         /* Return packets with reserved bits set */
 378         geneveh = geneve_hdr(skb);
 379         if (unlikely(geneveh->ver != GENEVE_VER))
 380                 goto drop;
 381
 382         gs = rcu_dereference_sk_user_data(sk);
 383         if (!gs)
 384                 goto drop;
 385
 386         geneve = geneve_lookup_skb(gs, skb);
 387         if (!geneve)
 388                 goto drop;
 389
 390         inner_proto = geneveh->proto_type;
 391
 392         if (unlikely((!geneve->cfg.inner_proto_inherit &&
 393                       inner_proto != htons(ETH_P_TEB)))) {
 394                 DEV_STATS_INC(geneve->dev, rx_dropped);
 395                 goto drop;
 396         }
 397
 398         opts_len = geneveh->opt_len * 4;
 399         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
 400                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 401                 DEV_STATS_INC(geneve->dev, rx_dropped);
 402                 goto drop;
 403         }
 404
 405         geneve_rx(geneve, gs, skb);
 406         return 0;
 407
 408 drop:
 409         /* Consume bad packet */
 410         kfree_skb(skb);
 411         return 0;
 412 }
 413
 414 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
 415 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
 416 {
 417         struct genevehdr *geneveh;
 418         struct geneve_sock *gs;
 419         u8 zero_vni[3] = { 0 };
 420         u8 *vni = zero_vni;
 421
 422         if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
 423                 return -EINVAL;
 424
 425         geneveh = geneve_hdr(skb);
 426         if (geneveh->ver != GENEVE_VER)
 427                 return -EINVAL;
 428
 429         if (geneveh->proto_type != htons(ETH_P_TEB))
 430                 return -EINVAL;
 431
 432         gs = rcu_dereference_sk_user_data(sk);
 433         if (!gs)
 434                 return -ENOENT;
 435
 436         if (geneve_get_sk_family(gs) == AF_INET) {
 437                 struct iphdr *iph = ip_hdr(skb);
 438                 __be32 addr4 = 0;
 439
 440                 if (!gs->collect_md) {
 441                         vni = geneve_hdr(skb)->vni;
 442                         addr4 = iph->daddr;
 443                 }
 444
 445                 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
 446         }
 447
 448 #if IS_ENABLED(CONFIG_IPV6)
 449         if (geneve_get_sk_family(gs) == AF_INET6) {
 450                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 451                 struct in6_addr addr6;
 452
 453                 memset(&addr6, 0, sizeof(struct in6_addr));
 454
 455                 if (!gs->collect_md) {
 456                         vni = geneve_hdr(skb)->vni;
 457                         addr6 = ip6h->daddr;
 458                 }
 459
 460                 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
 461         }
 462 #endif
 463
 464         return -EPFNOSUPPORT;
 465 }
 466
 467 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 468                                          __be16 port, bool ipv6_rx_csum)
 469 {
 470         struct socket *sock;
 471         struct udp_port_cfg udp_conf;
 472         int err;
 473
 474         memset(&udp_conf, 0, sizeof(udp_conf));
 475
 476         if (ipv6) {
 477                 udp_conf.family = AF_INET6;
 478                 udp_conf.ipv6_v6only = 1;
 479                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 480         } else {
 481                 udp_conf.family = AF_INET;
 482                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 483         }
 484
 485         udp_conf.local_udp_port = port;
 486
 487         /* Open UDP socket */
 488         err = udp_sock_create(net, &udp_conf, &sock);
 489         if (err < 0)
 490                 return ERR_PTR(err);
 491
 492         udp_allow_gso(sock->sk);
 493         return sock;
 494 }
 495
 496 static int geneve_hlen(struct genevehdr *gh)
 497 {
 498         return sizeof(*gh) + gh->opt_len * 4;
 499 }
 500
 501 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 502                                           struct list_head *head,
 503                                           struct sk_buff *skb)
 504 {
 505         struct sk_buff *pp = NULL;
 506         struct sk_buff *p;
 507         struct genevehdr *gh, *gh2;
 508         unsigned int hlen, gh_len, off_gnv;
 509         const struct packet_offload *ptype;
 510         __be16 type;
 511         int flush = 1;
 512
 513         off_gnv = skb_gro_offset(skb);
 514         hlen = off_gnv + sizeof(*gh);
 515         gh = skb_gro_header(skb, hlen, off_gnv);
 516         if (unlikely(!gh))
 517                 goto out;
 518
 519         if (gh->ver != GENEVE_VER || gh->oam)
 520                 goto out;
 521         gh_len = geneve_hlen(gh);
 522
 523         hlen = off_gnv + gh_len;
 524         if (skb_gro_header_hard(skb, hlen)) {
 525                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 526                 if (unlikely(!gh))
 527                         goto out;
 528         }
 529
 530         list_for_each_entry(p, head, list) {
 531                 if (!NAPI_GRO_CB(p)->same_flow)
 532                         continue;
 533
 534                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 535                 if (gh->opt_len != gh2->opt_len ||
 536                     memcmp(gh, gh2, gh_len)) {
 537                         NAPI_GRO_CB(p)->same_flow = 0;
 538                         continue;
 539                 }
 540         }
 541
 542         skb_gro_pull(skb, gh_len);
 543         skb_gro_postpull_rcsum(skb, gh, gh_len);
 544         type = gh->proto_type;
 545         if (likely(type == htons(ETH_P_TEB)))
 546                 return call_gro_receive(eth_gro_receive, head, skb);
 547
 548         ptype = gro_find_receive_by_type(type);
 549         if (!ptype)
 550                 goto out;
 551
 552         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 553         flush = 0;
 554
 555 out:
 556         skb_gro_flush_final(skb, pp, flush);
 557
 558         return pp;
 559 }
 560
 561 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 562                                int nhoff)
 563 {
 564         struct genevehdr *gh;
 565         struct packet_offload *ptype;
 566         __be16 type;
 567         int gh_len;
 568         int err = -ENOSYS;
 569
 570         gh = (struct genevehdr *)(skb->data + nhoff);
 571         gh_len = geneve_hlen(gh);
 572         type = gh->proto_type;
 573
 574         /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */
 575         if (likely(type == htons(ETH_P_TEB)))
 576                 return eth_gro_complete(skb, nhoff + gh_len);
 577
 578         ptype = gro_find_complete_by_type(type);
 579         if (ptype)
 580                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 581
 582         skb_set_inner_mac_header(skb, nhoff + gh_len);
 583
 584         return err;
 585 }
 586
 587 /* Create new listen socket if needed */
 588 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 589                                                 bool ipv6, bool ipv6_rx_csum)
 590 {
 591         struct geneve_net *gn = net_generic(net, geneve_net_id);
 592         struct geneve_sock *gs;
 593         struct socket *sock;
 594         struct udp_tunnel_sock_cfg tunnel_cfg;
 595         int h;
 596
 597         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 598         if (!gs)
 599                 return ERR_PTR(-ENOMEM);
 600
 601         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 602         if (IS_ERR(sock)) {
 603                 kfree(gs);
 604                 return ERR_CAST(sock);
 605         }
 606
 607         gs->sock = sock;
 608         gs->refcnt = 1;
 609         for (h = 0; h < VNI_HASH_SIZE; ++h)
 610                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 611
 612         /* Initialize the geneve udp offloads structure */
 613         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 614
 615         /* Mark socket as an encapsulation socket */
 616         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 617         tunnel_cfg.sk_user_data = gs;
 618         tunnel_cfg.encap_type = 1;
 619         tunnel_cfg.gro_receive = geneve_gro_receive;
 620         tunnel_cfg.gro_complete = geneve_gro_complete;
 621         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 622         tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
 623         tunnel_cfg.encap_destroy = NULL;
 624         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 625         list_add(&gs->list, &gn->sock_list);
 626         return gs;
 627 }
 628
 629 static void __geneve_sock_release(struct geneve_sock *gs)
 630 {
 631         if (!gs || --gs->refcnt)
 632                 return;
 633
 634         list_del(&gs->list);
 635         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 636         udp_tunnel_sock_release(gs->sock);
 637         kfree_rcu(gs, rcu);
 638 }
 639
 640 static void geneve_sock_release(struct geneve_dev *geneve)
 641 {
 642         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 643 #if IS_ENABLED(CONFIG_IPV6)
 644         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 645
 646         rcu_assign_pointer(geneve->sock6, NULL);
 647 #endif
 648
 649         rcu_assign_pointer(geneve->sock4, NULL);
 650         synchronize_net();
 651
 652         __geneve_sock_release(gs4);
 653 #if IS_ENABLED(CONFIG_IPV6)
 654         __geneve_sock_release(gs6);
 655 #endif
 656 }
 657
 658 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 659                                             sa_family_t family,
 660                                             __be16 dst_port)
 661 {
 662         struct geneve_sock *gs;
 663
 664         list_for_each_entry(gs, &gn->sock_list, list) {
 665                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 666                     geneve_get_sk_family(gs) == family) {
 667                         return gs;
 668                 }
 669         }
 670         return NULL;
 671 }
 672
 673 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 674 {
 675         struct net *net = geneve->net;
 676         struct geneve_net *gn = net_generic(net, geneve_net_id);
 677         struct geneve_dev_node *node;
 678         struct geneve_sock *gs;
 679         __u8 vni[3];
 680         __u32 hash;
 681
 682         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
 683         if (gs) {
 684                 gs->refcnt++;
 685                 goto out;
 686         }
 687
 688         gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
 689                                   geneve->cfg.use_udp6_rx_checksums);
 690         if (IS_ERR(gs))
 691                 return PTR_ERR(gs);
 692
 693 out:
 694         gs->collect_md = geneve->cfg.collect_md;
 695 #if IS_ENABLED(CONFIG_IPV6)
 696         if (ipv6) {
 697                 rcu_assign_pointer(geneve->sock6, gs);
 698                 node = &geneve->hlist6;
 699         } else
 700 #endif
 701         {
 702                 rcu_assign_pointer(geneve->sock4, gs);
 703                 node = &geneve->hlist4;
 704         }
 705         node->geneve = geneve;
 706
 707         tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
 708         hash = geneve_net_vni_hash(vni);
 709         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 710         return 0;
 711 }
 712
 713 static int geneve_open(struct net_device *dev)
 714 {
 715         struct geneve_dev *geneve = netdev_priv(dev);
 716         bool metadata = geneve->cfg.collect_md;
 717         bool ipv4, ipv6;
 718         int ret = 0;
 719
 720         ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
 721         ipv4 = !ipv6 || metadata;
 722 #if IS_ENABLED(CONFIG_IPV6)
 723         if (ipv6) {
 724                 ret = geneve_sock_add(geneve, true);
 725                 if (ret < 0 && ret != -EAFNOSUPPORT)
 726                         ipv4 = false;
 727         }
 728 #endif
 729         if (ipv4)
 730                 ret = geneve_sock_add(geneve, false);
 731         if (ret < 0)
 732                 geneve_sock_release(geneve);
 733
 734         return ret;
 735 }
 736
 737 static int geneve_stop(struct net_device *dev)
 738 {
 739         struct geneve_dev *geneve = netdev_priv(dev);
 740
 741         hlist_del_init_rcu(&geneve->hlist4.hlist);
 742 #if IS_ENABLED(CONFIG_IPV6)
 743         hlist_del_init_rcu(&geneve->hlist6.hlist);
 744 #endif
 745         geneve_sock_release(geneve);
 746         return 0;
 747 }
 748
 749 static void geneve_build_header(struct genevehdr *geneveh,
 750                                 const struct ip_tunnel_info *info,
 751                                 __be16 inner_proto)
 752 {
 753         geneveh->ver = GENEVE_VER;
 754         geneveh->opt_len = info->options_len / 4;
 755         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 756         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 757         geneveh->rsvd1 = 0;
 758         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 759         geneveh->proto_type = inner_proto;
 760         geneveh->rsvd2 = 0;
 761
 762         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 763                 ip_tunnel_info_opts_get(geneveh->options, info);
 764 }
 765
 766 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 767                             const struct ip_tunnel_info *info,
 768                             bool xnet, int ip_hdr_len,
 769                             bool inner_proto_inherit)
 770 {
 771         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 772         struct genevehdr *gnvh;
 773         __be16 inner_proto;
 774         int min_headroom;
 775         int err;
 776
 777         skb_reset_mac_header(skb);
 778         skb_scrub_packet(skb, xnet);
 779
 780         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 781                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 782         err = skb_cow_head(skb, min_headroom);
 783         if (unlikely(err))
 784                 goto free_dst;
 785
 786         err = udp_tunnel_handle_offloads(skb, udp_sum);
 787         if (err)
 788                 goto free_dst;
 789
 790         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 791         inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB);
 792         geneve_build_header(gnvh, info, inner_proto);
 793         skb_set_inner_protocol(skb, inner_proto);
 794         return 0;
 795
 796 free_dst:
 797         dst_release(dst);
 798         return err;
 799 }
 800
 801 static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev,
 802                              const struct ip_tunnel_info *info,
 803                              bool *use_cache)
 804 {
 805         struct geneve_dev *geneve = netdev_priv(dev);
 806         u8 dsfield;
 807
 808         dsfield = info->key.tos;
 809         if (dsfield == 1 && !geneve->cfg.collect_md) {
 810                 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 811                 *use_cache = false;
 812         }
 813
 814         return dsfield;
 815 }
 816
 817 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 818                            struct geneve_dev *geneve,
 819                            const struct ip_tunnel_info *info)
 820 {
 821         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 822         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 823         const struct ip_tunnel_key *key = &info->key;
 824         struct rtable *rt;
 825         bool use_cache;
 826         __u8 tos, ttl;
 827         __be16 df = 0;
 828         __be32 saddr;
 829         __be16 sport;
 830         int err;
 831
 832         if (!pskb_inet_may_pull(skb))
 833                 return -EINVAL;
 834
 835         if (!gs4)
 836                 return -EIO;
 837
 838         use_cache = ip_tunnel_dst_cache_usable(skb, info);
 839         tos = geneve_get_dsfield(skb, dev, info, &use_cache);
 840         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 841
 842         rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
 843                                    &info->key,
 844                                    sport, geneve->cfg.info.key.tp_dst, tos,
 845                                    use_cache ?
 846                                    (struct dst_cache *)&info->dst_cache : NULL);
 847         if (IS_ERR(rt))
 848                 return PTR_ERR(rt);
 849
 850         err = skb_tunnel_check_pmtu(skb, &rt->dst,
 851                                     GENEVE_IPV4_HLEN + info->options_len,
 852                                     netif_is_any_bridge_port(dev));
 853         if (err < 0) {
 854                 dst_release(&rt->dst);
 855                 return err;
 856         } else if (err) {
 857                 struct ip_tunnel_info *info;
 858
 859                 info = skb_tunnel_info(skb);
 860                 if (info) {
 861                         struct ip_tunnel_info *unclone;
 862
 863                         unclone = skb_tunnel_info_unclone(skb);
 864                         if (unlikely(!unclone)) {
 865                                 dst_release(&rt->dst);
 866                                 return -ENOMEM;
 867                         }
 868
 869                         unclone->key.u.ipv4.dst = saddr;
 870                         unclone->key.u.ipv4.src = info->key.u.ipv4.dst;
 871                 }
 872
 873                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 874                         dst_release(&rt->dst);
 875                         return -EINVAL;
 876                 }
 877
 878                 skb->protocol = eth_type_trans(skb, geneve->dev);
 879                 __netif_rx(skb);
 880                 dst_release(&rt->dst);
 881                 return -EMSGSIZE;
 882         }
 883
 884         tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb);
 885         if (geneve->cfg.collect_md) {
 886                 ttl = key->ttl;
 887
 888                 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 889         } else {
 890                 if (geneve->cfg.ttl_inherit)
 891                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 892                 else
 893                         ttl = key->ttl;
 894                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 895
 896                 if (geneve->cfg.df == GENEVE_DF_SET) {
 897                         df = htons(IP_DF);
 898                 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
 899                         struct ethhdr *eth = eth_hdr(skb);
 900
 901                         if (ntohs(eth->h_proto) == ETH_P_IPV6) {
 902                                 df = htons(IP_DF);
 903                         } else if (ntohs(eth->h_proto) == ETH_P_IP) {
 904                                 struct iphdr *iph = ip_hdr(skb);
 905
 906                                 if (iph->frag_off & htons(IP_DF))
 907                                         df = htons(IP_DF);
 908                         }
 909                 }
 910         }
 911
 912         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr),
 913                                geneve->cfg.inner_proto_inherit);
 914         if (unlikely(err))
 915                 return err;
 916
 917         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst,
 918                             tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
 919                             !net_eq(geneve->net, dev_net(geneve->dev)),
 920                             !(info->key.tun_flags & TUNNEL_CSUM));
 921         return 0;
 922 }
 923
 924 #if IS_ENABLED(CONFIG_IPV6)
 925 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 926                             struct geneve_dev *geneve,
 927                             const struct ip_tunnel_info *info)
 928 {
 929         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 930         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 931         const struct ip_tunnel_key *key = &info->key;
 932         struct dst_entry *dst = NULL;
 933         struct in6_addr saddr;
 934         bool use_cache;
 935         __u8 prio, ttl;
 936         __be16 sport;
 937         int err;
 938
 939         if (!pskb_inet_may_pull(skb))
 940                 return -EINVAL;
 941
 942         if (!gs6)
 943                 return -EIO;
 944
 945         use_cache = ip_tunnel_dst_cache_usable(skb, info);
 946         prio = geneve_get_dsfield(skb, dev, info, &use_cache);
 947         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 948
 949         dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
 950                                      &saddr, key, sport,
 951                                      geneve->cfg.info.key.tp_dst, prio,
 952                                      use_cache ?
 953                                      (struct dst_cache *)&info->dst_cache : NULL);
 954         if (IS_ERR(dst))
 955                 return PTR_ERR(dst);
 956
 957         err = skb_tunnel_check_pmtu(skb, dst,
 958                                     GENEVE_IPV6_HLEN + info->options_len,
 959                                     netif_is_any_bridge_port(dev));
 960         if (err < 0) {
 961                 dst_release(dst);
 962                 return err;
 963         } else if (err) {
 964                 struct ip_tunnel_info *info = skb_tunnel_info(skb);
 965
 966                 if (info) {
 967                         struct ip_tunnel_info *unclone;
 968
 969                         unclone = skb_tunnel_info_unclone(skb);
 970                         if (unlikely(!unclone)) {
 971                                 dst_release(dst);
 972                                 return -ENOMEM;
 973                         }
 974
 975                         unclone->key.u.ipv6.dst = saddr;
 976                         unclone->key.u.ipv6.src = info->key.u.ipv6.dst;
 977                 }
 978
 979                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 980                         dst_release(dst);
 981                         return -EINVAL;
 982                 }
 983
 984                 skb->protocol = eth_type_trans(skb, geneve->dev);
 985                 __netif_rx(skb);
 986                 dst_release(dst);
 987                 return -EMSGSIZE;
 988         }
 989
 990         prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb);
 991         if (geneve->cfg.collect_md) {
 992                 ttl = key->ttl;
 993         } else {
 994                 if (geneve->cfg.ttl_inherit)
 995                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 996                 else
 997                         ttl = key->ttl;
 998                 ttl = ttl ? : ip6_dst_hoplimit(dst);
 999         }
1000         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr),
1001                                geneve->cfg.inner_proto_inherit);
1002         if (unlikely(err))
1003                 return err;
1004
1005         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1006                              &saddr, &key->u.ipv6.dst, prio, ttl,
1007                              info->key.label, sport, geneve->cfg.info.key.tp_dst,
1008                              !(info->key.tun_flags & TUNNEL_CSUM));
1009         return 0;
1010 }
1011 #endif
1012
1013 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1014 {
1015         struct geneve_dev *geneve = netdev_priv(dev);
1016         struct ip_tunnel_info *info = NULL;
1017         int err;
1018
1019         if (geneve->cfg.collect_md) {
1020                 info = skb_tunnel_info(skb);
1021                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1022                         netdev_dbg(dev, "no tunnel metadata\n");
1023                         dev_kfree_skb(skb);
1024                         DEV_STATS_INC(dev, tx_dropped);
1025                         return NETDEV_TX_OK;
1026                 }
1027         } else {
1028                 info = &geneve->cfg.info;
1029         }
1030
1031         rcu_read_lock();
1032 #if IS_ENABLED(CONFIG_IPV6)
1033         if (info->mode & IP_TUNNEL_INFO_IPV6)
1034                 err = geneve6_xmit_skb(skb, dev, geneve, info);
1035         else
1036 #endif
1037                 err = geneve_xmit_skb(skb, dev, geneve, info);
1038         rcu_read_unlock();
1039
1040         if (likely(!err))
1041                 return NETDEV_TX_OK;
1042
1043         if (err != -EMSGSIZE)
1044                 dev_kfree_skb(skb);
1045
1046         if (err == -ELOOP)
1047                 DEV_STATS_INC(dev, collisions);
1048         else if (err == -ENETUNREACH)
1049                 DEV_STATS_INC(dev, tx_carrier_errors);
1050
1051         DEV_STATS_INC(dev, tx_errors);
1052         return NETDEV_TX_OK;
1053 }
1054
1055 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1056 {
1057         if (new_mtu > dev->max_mtu)
1058                 new_mtu = dev->max_mtu;
1059         else if (new_mtu < dev->min_mtu)
1060                 new_mtu = dev->min_mtu;
1061
1062         dev->mtu = new_mtu;
1063         return 0;
1064 }
1065
1066 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1067 {
1068         struct ip_tunnel_info *info = skb_tunnel_info(skb);
1069         struct geneve_dev *geneve = netdev_priv(dev);
1070         __be16 sport;
1071
1072         if (ip_tunnel_info_af(info) == AF_INET) {
1073                 struct rtable *rt;
1074                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1075                 bool use_cache;
1076                 __be32 saddr;
1077                 u8 tos;
1078
1079                 if (!gs4)
1080                         return -EIO;
1081
1082                 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1083                 tos = geneve_get_dsfield(skb, dev, info, &use_cache);
1084                 sport = udp_flow_src_port(geneve->net, skb,
1085                                           1, USHRT_MAX, true);
1086
1087                 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr,
1088                                            &info->key,
1089                                            sport, geneve->cfg.info.key.tp_dst,
1090                                            tos,
1091                                            use_cache ? &info->dst_cache : NULL);
1092                 if (IS_ERR(rt))
1093                         return PTR_ERR(rt);
1094
1095                 ip_rt_put(rt);
1096                 info->key.u.ipv4.src = saddr;
1097 #if IS_ENABLED(CONFIG_IPV6)
1098         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1099                 struct dst_entry *dst;
1100                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1101                 struct in6_addr saddr;
1102                 bool use_cache;
1103                 u8 prio;
1104
1105                 if (!gs6)
1106                         return -EIO;
1107
1108                 use_cache = ip_tunnel_dst_cache_usable(skb, info);
1109                 prio = geneve_get_dsfield(skb, dev, info, &use_cache);
1110                 sport = udp_flow_src_port(geneve->net, skb,
1111                                           1, USHRT_MAX, true);
1112
1113                 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0,
1114                                              &saddr, &info->key, sport,
1115                                              geneve->cfg.info.key.tp_dst, prio,
1116                                              use_cache ? &info->dst_cache : NULL);
1117                 if (IS_ERR(dst))
1118                         return PTR_ERR(dst);
1119
1120                 dst_release(dst);
1121                 info->key.u.ipv6.src = saddr;
1122 #endif
1123         } else {
1124                 return -EINVAL;
1125         }
1126
1127         info->key.tp_src = sport;
1128         info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1129         return 0;
1130 }
1131
1132 static const struct net_device_ops geneve_netdev_ops = {
1133         .ndo_init               = geneve_init,
1134         .ndo_uninit             = geneve_uninit,
1135         .ndo_open               = geneve_open,
1136         .ndo_stop               = geneve_stop,
1137         .ndo_start_xmit         = geneve_xmit,
1138         .ndo_get_stats64        = dev_get_tstats64,
1139         .ndo_change_mtu         = geneve_change_mtu,
1140         .ndo_validate_addr      = eth_validate_addr,
1141         .ndo_set_mac_address    = eth_mac_addr,
1142         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1143 };
1144
1145 static void geneve_get_drvinfo(struct net_device *dev,
1146                                struct ethtool_drvinfo *drvinfo)
1147 {
1148         strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1149         strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1150 }
1151
1152 static const struct ethtool_ops geneve_ethtool_ops = {
1153         .get_drvinfo    = geneve_get_drvinfo,
1154         .get_link       = ethtool_op_get_link,
1155 };
1156
1157 /* Info for udev, that this is a virtual tunnel endpoint */
1158 static struct device_type geneve_type = {
1159         .name = "geneve",
1160 };
1161
1162 /* Calls the ndo_udp_tunnel_add of the caller in order to
1163  * supply the listening GENEVE udp ports. Callers are expected
1164  * to implement the ndo_udp_tunnel_add.
1165  */
1166 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1167 {
1168         struct net *net = dev_net(dev);
1169         struct geneve_net *gn = net_generic(net, geneve_net_id);
1170         struct geneve_sock *gs;
1171
1172         rcu_read_lock();
1173         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1174                 if (push) {
1175                         udp_tunnel_push_rx_port(dev, gs->sock,
1176                                                 UDP_TUNNEL_TYPE_GENEVE);
1177                 } else {
1178                         udp_tunnel_drop_rx_port(dev, gs->sock,
1179                                                 UDP_TUNNEL_TYPE_GENEVE);
1180                 }
1181         }
1182         rcu_read_unlock();
1183 }
1184
1185 /* Initialize the device structure. */
1186 static void geneve_setup(struct net_device *dev)
1187 {
1188         ether_setup(dev);
1189
1190         dev->netdev_ops = &geneve_netdev_ops;
1191         dev->ethtool_ops = &geneve_ethtool_ops;
1192         dev->needs_free_netdev = true;
1193
1194         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1195
1196         dev->features    |= NETIF_F_LLTX;
1197         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1198         dev->features    |= NETIF_F_RXCSUM;
1199         dev->features    |= NETIF_F_GSO_SOFTWARE;
1200
1201         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1202         dev->hw_features |= NETIF_F_RXCSUM;
1203         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1204
1205         /* MTU range: 68 - (something less than 65535) */
1206         dev->min_mtu = ETH_MIN_MTU;
1207         /* The max_mtu calculation does not take account of GENEVE
1208          * options, to avoid excluding potentially valid
1209          * configurations. This will be further reduced by IPvX hdr size.
1210          */
1211         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1212
1213         netif_keep_dst(dev);
1214         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1215         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1216         eth_hw_addr_random(dev);
1217 }
1218
1219 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1220         [IFLA_GENEVE_UNSPEC]            = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT },
1221         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1222         [IFLA_GENEVE_REMOTE]            = { .len = sizeof_field(struct iphdr, daddr) },
1223         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1224         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1225         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1226         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1227         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1228         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1229         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1230         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1231         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1232         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1233         [IFLA_GENEVE_DF]                = { .type = NLA_U8 },
1234         [IFLA_GENEVE_INNER_PROTO_INHERIT]       = { .type = NLA_FLAG },
1235 };
1236
1237 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1238                            struct netlink_ext_ack *extack)
1239 {
1240         if (tb[IFLA_ADDRESS]) {
1241                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1242                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1243                                             "Provided link layer address is not Ethernet");
1244                         return -EINVAL;
1245                 }
1246
1247                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1248                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1249                                             "Provided Ethernet address is not unicast");
1250                         return -EADDRNOTAVAIL;
1251                 }
1252         }
1253
1254         if (!data) {
1255                 NL_SET_ERR_MSG(extack,
1256                                "Not enough attributes provided to perform the operation");
1257                 return -EINVAL;
1258         }
1259
1260         if (data[IFLA_GENEVE_ID]) {
1261                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1262
1263                 if (vni >= GENEVE_N_VID) {
1264                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1265                                             "Geneve ID must be lower than 16777216");
1266                         return -ERANGE;
1267                 }
1268         }
1269
1270         if (data[IFLA_GENEVE_DF]) {
1271                 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1272
1273                 if (df < 0 || df > GENEVE_DF_MAX) {
1274                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1275                                             "Invalid DF attribute");
1276                         return -EINVAL;
1277                 }
1278         }
1279
1280         return 0;
1281 }
1282
1283 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1284                                           const struct ip_tunnel_info *info,
1285                                           bool *tun_on_same_port,
1286                                           bool *tun_collect_md)
1287 {
1288         struct geneve_dev *geneve, *t = NULL;
1289
1290         *tun_on_same_port = false;
1291         *tun_collect_md = false;
1292         list_for_each_entry(geneve, &gn->geneve_list, next) {
1293                 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1294                         *tun_collect_md = geneve->cfg.collect_md;
1295                         *tun_on_same_port = true;
1296                 }
1297                 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1298                     info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1299                     !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1300                         t = geneve;
1301         }
1302         return t;
1303 }
1304
1305 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1306 {
1307         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1308                  info->key.ttl || info->key.label || info->key.tp_src ||
1309                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1310 }
1311
1312 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1313                                   struct ip_tunnel_info *b)
1314 {
1315         if (ip_tunnel_info_af(a) == AF_INET)
1316                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1317         else
1318                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1319 }
1320
1321 static int geneve_configure(struct net *net, struct net_device *dev,
1322                             struct netlink_ext_ack *extack,
1323                             const struct geneve_config *cfg)
1324 {
1325         struct geneve_net *gn = net_generic(net, geneve_net_id);
1326         struct geneve_dev *t, *geneve = netdev_priv(dev);
1327         const struct ip_tunnel_info *info = &cfg->info;
1328         bool tun_collect_md, tun_on_same_port;
1329         int err, encap_len;
1330
1331         if (cfg->collect_md && !is_tnl_info_zero(info)) {
1332                 NL_SET_ERR_MSG(extack,
1333                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1334                 return -EINVAL;
1335         }
1336
1337         geneve->net = net;
1338         geneve->dev = dev;
1339
1340         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1341         if (t)
1342                 return -EBUSY;
1343
1344         /* make enough headroom for basic scenario */
1345         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1346         if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1347                 encap_len += sizeof(struct iphdr);
1348                 dev->max_mtu -= sizeof(struct iphdr);
1349         } else {
1350                 encap_len += sizeof(struct ipv6hdr);
1351                 dev->max_mtu -= sizeof(struct ipv6hdr);
1352         }
1353         dev->needed_headroom = encap_len + ETH_HLEN;
1354
1355         if (cfg->collect_md) {
1356                 if (tun_on_same_port) {
1357                         NL_SET_ERR_MSG(extack,
1358                                        "There can be only one externally controlled device on a destination port");
1359                         return -EPERM;
1360                 }
1361         } else {
1362                 if (tun_collect_md) {
1363                         NL_SET_ERR_MSG(extack,
1364                                        "There already exists an externally controlled device on this destination port");
1365                         return -EPERM;
1366                 }
1367         }
1368
1369         dst_cache_reset(&geneve->cfg.info.dst_cache);
1370         memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1371
1372         if (geneve->cfg.inner_proto_inherit) {
1373                 dev->header_ops = NULL;
1374                 dev->type = ARPHRD_NONE;
1375                 dev->hard_header_len = 0;
1376                 dev->addr_len = 0;
1377                 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1378         }
1379
1380         err = register_netdevice(dev);
1381         if (err)
1382                 return err;
1383
1384         list_add(&geneve->next, &gn->geneve_list);
1385         return 0;
1386 }
1387
1388 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1389 {
1390         memset(info, 0, sizeof(*info));
1391         info->key.tp_dst = htons(dst_port);
1392 }
1393
1394 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1395                           struct netlink_ext_ack *extack,
1396                           struct geneve_config *cfg, bool changelink)
1397 {
1398         struct ip_tunnel_info *info = &cfg->info;
1399         int attrtype;
1400
1401         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1402                 NL_SET_ERR_MSG(extack,
1403                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1404                 return -EINVAL;
1405         }
1406
1407         if (data[IFLA_GENEVE_REMOTE]) {
1408                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1409                         attrtype = IFLA_GENEVE_REMOTE;
1410                         goto change_notsup;
1411                 }
1412
1413                 info->key.u.ipv4.dst =
1414                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1415
1416                 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1417                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1418                                             "Remote IPv4 address cannot be Multicast");
1419                         return -EINVAL;
1420                 }
1421         }
1422
1423         if (data[IFLA_GENEVE_REMOTE6]) {
1424 #if IS_ENABLED(CONFIG_IPV6)
1425                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1426                         attrtype = IFLA_GENEVE_REMOTE6;
1427                         goto change_notsup;
1428                 }
1429
1430                 info->mode = IP_TUNNEL_INFO_IPV6;
1431                 info->key.u.ipv6.dst =
1432                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1433
1434                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1435                     IPV6_ADDR_LINKLOCAL) {
1436                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1437                                             "Remote IPv6 address cannot be link-local");
1438                         return -EINVAL;
1439                 }
1440                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1441                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1442                                             "Remote IPv6 address cannot be Multicast");
1443                         return -EINVAL;
1444                 }
1445                 info->key.tun_flags |= TUNNEL_CSUM;
1446                 cfg->use_udp6_rx_checksums = true;
1447 #else
1448                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1449                                     "IPv6 support not enabled in the kernel");
1450                 return -EPFNOSUPPORT;
1451 #endif
1452         }
1453
1454         if (data[IFLA_GENEVE_ID]) {
1455                 __u32 vni;
1456                 __u8 tvni[3];
1457                 __be64 tunid;
1458
1459                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1460                 tvni[0] = (vni & 0x00ff0000) >> 16;
1461                 tvni[1] = (vni & 0x0000ff00) >> 8;
1462                 tvni[2] =  vni & 0x000000ff;
1463
1464                 tunid = vni_to_tunnel_id(tvni);
1465                 if (changelink && (tunid != info->key.tun_id)) {
1466                         attrtype = IFLA_GENEVE_ID;
1467                         goto change_notsup;
1468                 }
1469                 info->key.tun_id = tunid;
1470         }
1471
1472         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1473                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1474                         cfg->ttl_inherit = true;
1475                 else
1476                         cfg->ttl_inherit = false;
1477         } else if (data[IFLA_GENEVE_TTL]) {
1478                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1479                 cfg->ttl_inherit = false;
1480         }
1481
1482         if (data[IFLA_GENEVE_TOS])
1483                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1484
1485         if (data[IFLA_GENEVE_DF])
1486                 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1487
1488         if (data[IFLA_GENEVE_LABEL]) {
1489                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1490                                   IPV6_FLOWLABEL_MASK;
1491                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1492                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1493                                             "Label attribute only applies for IPv6 Geneve devices");
1494                         return -EINVAL;
1495                 }
1496         }
1497
1498         if (data[IFLA_GENEVE_PORT]) {
1499                 if (changelink) {
1500                         attrtype = IFLA_GENEVE_PORT;
1501                         goto change_notsup;
1502                 }
1503                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1504         }
1505
1506         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1507                 if (changelink) {
1508                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1509                         goto change_notsup;
1510                 }
1511                 cfg->collect_md = true;
1512         }
1513
1514         if (data[IFLA_GENEVE_UDP_CSUM]) {
1515                 if (changelink) {
1516                         attrtype = IFLA_GENEVE_UDP_CSUM;
1517                         goto change_notsup;
1518                 }
1519                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1520                         info->key.tun_flags |= TUNNEL_CSUM;
1521         }
1522
1523         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1524 #if IS_ENABLED(CONFIG_IPV6)
1525                 if (changelink) {
1526                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1527                         goto change_notsup;
1528                 }
1529                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1530                         info->key.tun_flags &= ~TUNNEL_CSUM;
1531 #else
1532                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1533                                     "IPv6 support not enabled in the kernel");
1534                 return -EPFNOSUPPORT;
1535 #endif
1536         }
1537
1538         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1539 #if IS_ENABLED(CONFIG_IPV6)
1540                 if (changelink) {
1541                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1542                         goto change_notsup;
1543                 }
1544                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1545                         cfg->use_udp6_rx_checksums = false;
1546 #else
1547                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1548                                     "IPv6 support not enabled in the kernel");
1549                 return -EPFNOSUPPORT;
1550 #endif
1551         }
1552
1553         if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) {
1554                 if (changelink) {
1555                         attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT;
1556                         goto change_notsup;
1557                 }
1558                 cfg->inner_proto_inherit = true;
1559         }
1560
1561         return 0;
1562 change_notsup:
1563         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1564                             "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported");
1565         return -EOPNOTSUPP;
1566 }
1567
1568 static void geneve_link_config(struct net_device *dev,
1569                                struct ip_tunnel_info *info, struct nlattr *tb[])
1570 {
1571         struct geneve_dev *geneve = netdev_priv(dev);
1572         int ldev_mtu = 0;
1573
1574         if (tb[IFLA_MTU]) {
1575                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1576                 return;
1577         }
1578
1579         switch (ip_tunnel_info_af(info)) {
1580         case AF_INET: {
1581                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1582                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1583
1584                 if (!IS_ERR(rt) && rt->dst.dev) {
1585                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1586                         ip_rt_put(rt);
1587                 }
1588                 break;
1589         }
1590 #if IS_ENABLED(CONFIG_IPV6)
1591         case AF_INET6: {
1592                 struct rt6_info *rt;
1593
1594                 if (!__in6_dev_get(dev))
1595                         break;
1596
1597                 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1598                                 NULL, 0);
1599
1600                 if (rt && rt->dst.dev)
1601                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1602                 ip6_rt_put(rt);
1603                 break;
1604         }
1605 #endif
1606         }
1607
1608         if (ldev_mtu <= 0)
1609                 return;
1610
1611         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1612 }
1613
1614 static int geneve_newlink(struct net *net, struct net_device *dev,
1615                           struct nlattr *tb[], struct nlattr *data[],
1616                           struct netlink_ext_ack *extack)
1617 {
1618         struct geneve_config cfg = {
1619                 .df = GENEVE_DF_UNSET,
1620                 .use_udp6_rx_checksums = false,
1621                 .ttl_inherit = false,
1622                 .collect_md = false,
1623         };
1624         int err;
1625
1626         init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1627         err = geneve_nl2info(tb, data, extack, &cfg, false);
1628         if (err)
1629                 return err;
1630
1631         err = geneve_configure(net, dev, extack, &cfg);
1632         if (err)
1633                 return err;
1634
1635         geneve_link_config(dev, &cfg.info, tb);
1636
1637         return 0;
1638 }
1639
1640 /* Quiesces the geneve device data path for both TX and RX.
1641  *
1642  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1643  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1644  * to complete for the existing set of in-flight packets to be transmitted,
1645  * then we would have quiesced the transmit data path. All the future packets
1646  * will get dropped until we unquiesce the data path.
1647  *
1648  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1649  * if we set that to NULL under RCU and wait for synchronize_net() to
1650  * complete, then we would have quiesced the receive data path.
1651  */
1652 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1653                            struct geneve_sock **gs6)
1654 {
1655         *gs4 = rtnl_dereference(geneve->sock4);
1656         rcu_assign_pointer(geneve->sock4, NULL);
1657         if (*gs4)
1658                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1659 #if IS_ENABLED(CONFIG_IPV6)
1660         *gs6 = rtnl_dereference(geneve->sock6);
1661         rcu_assign_pointer(geneve->sock6, NULL);
1662         if (*gs6)
1663                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1664 #else
1665         *gs6 = NULL;
1666 #endif
1667         synchronize_net();
1668 }
1669
1670 /* Resumes the geneve device data path for both TX and RX. */
1671 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1672                              struct geneve_sock __maybe_unused *gs6)
1673 {
1674         rcu_assign_pointer(geneve->sock4, gs4);
1675         if (gs4)
1676                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1677 #if IS_ENABLED(CONFIG_IPV6)
1678         rcu_assign_pointer(geneve->sock6, gs6);
1679         if (gs6)
1680                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1681 #endif
1682         synchronize_net();
1683 }
1684
1685 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1686                              struct nlattr *data[],
1687                              struct netlink_ext_ack *extack)
1688 {
1689         struct geneve_dev *geneve = netdev_priv(dev);
1690         struct geneve_sock *gs4, *gs6;
1691         struct geneve_config cfg;
1692         int err;
1693
1694         /* If the geneve device is configured for metadata (or externally
1695          * controlled, for example, OVS), then nothing can be changed.
1696          */
1697         if (geneve->cfg.collect_md)
1698                 return -EOPNOTSUPP;
1699
1700         /* Start with the existing info. */
1701         memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1702         err = geneve_nl2info(tb, data, extack, &cfg, true);
1703         if (err)
1704                 return err;
1705
1706         if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1707                 dst_cache_reset(&cfg.info.dst_cache);
1708                 geneve_link_config(dev, &cfg.info, tb);
1709         }
1710
1711         geneve_quiesce(geneve, &gs4, &gs6);
1712         memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1713         geneve_unquiesce(geneve, gs4, gs6);
1714
1715         return 0;
1716 }
1717
1718 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1719 {
1720         struct geneve_dev *geneve = netdev_priv(dev);
1721
1722         list_del(&geneve->next);
1723         unregister_netdevice_queue(dev, head);
1724 }
1725
1726 static size_t geneve_get_size(const struct net_device *dev)
1727 {
1728         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1729                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1730                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1731                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1732                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_DF */
1733                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1734                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1735                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1736                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1737                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1738                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1739                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1740                 nla_total_size(0) +      /* IFLA_GENEVE_INNER_PROTO_INHERIT */
1741                 0;
1742 }
1743
1744 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1745 {
1746         struct geneve_dev *geneve = netdev_priv(dev);
1747         struct ip_tunnel_info *info = &geneve->cfg.info;
1748         bool ttl_inherit = geneve->cfg.ttl_inherit;
1749         bool metadata = geneve->cfg.collect_md;
1750         __u8 tmp_vni[3];
1751         __u32 vni;
1752
1753         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1754         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1755         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1756                 goto nla_put_failure;
1757
1758         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1759                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1760                                     info->key.u.ipv4.dst))
1761                         goto nla_put_failure;
1762                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1763                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1764                         goto nla_put_failure;
1765
1766 #if IS_ENABLED(CONFIG_IPV6)
1767         } else if (!metadata) {
1768                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1769                                      &info->key.u.ipv6.dst))
1770                         goto nla_put_failure;
1771                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1772                                !(info->key.tun_flags & TUNNEL_CSUM)))
1773                         goto nla_put_failure;
1774 #endif
1775         }
1776
1777         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1778             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1779             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1780                 goto nla_put_failure;
1781
1782         if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1783                 goto nla_put_failure;
1784
1785         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1786                 goto nla_put_failure;
1787
1788         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1789                 goto nla_put_failure;
1790
1791 #if IS_ENABLED(CONFIG_IPV6)
1792         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1793                        !geneve->cfg.use_udp6_rx_checksums))
1794                 goto nla_put_failure;
1795 #endif
1796
1797         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1798                 goto nla_put_failure;
1799
1800         if (geneve->cfg.inner_proto_inherit &&
1801             nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT))
1802                 goto nla_put_failure;
1803
1804         return 0;
1805
1806 nla_put_failure:
1807         return -EMSGSIZE;
1808 }
1809
1810 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1811         .kind           = "geneve",
1812         .maxtype        = IFLA_GENEVE_MAX,
1813         .policy         = geneve_policy,
1814         .priv_size      = sizeof(struct geneve_dev),
1815         .setup          = geneve_setup,
1816         .validate       = geneve_validate,
1817         .newlink        = geneve_newlink,
1818         .changelink     = geneve_changelink,
1819         .dellink        = geneve_dellink,
1820         .get_size       = geneve_get_size,
1821         .fill_info      = geneve_fill_info,
1822 };
1823
1824 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1825                                         u8 name_assign_type, u16 dst_port)
1826 {
1827         struct nlattr *tb[IFLA_MAX + 1];
1828         struct net_device *dev;
1829         LIST_HEAD(list_kill);
1830         int err;
1831         struct geneve_config cfg = {
1832                 .df = GENEVE_DF_UNSET,
1833                 .use_udp6_rx_checksums = true,
1834                 .ttl_inherit = false,
1835                 .collect_md = true,
1836         };
1837
1838         memset(tb, 0, sizeof(tb));
1839         dev = rtnl_create_link(net, name, name_assign_type,
1840                                &geneve_link_ops, tb, NULL);
1841         if (IS_ERR(dev))
1842                 return dev;
1843
1844         init_tnl_info(&cfg.info, dst_port);
1845         err = geneve_configure(net, dev, NULL, &cfg);
1846         if (err) {
1847                 free_netdev(dev);
1848                 return ERR_PTR(err);
1849         }
1850
1851         /* openvswitch users expect packet sizes to be unrestricted,
1852          * so set the largest MTU we can.
1853          */
1854         err = geneve_change_mtu(dev, IP_MAX_MTU);
1855         if (err)
1856                 goto err;
1857
1858         err = rtnl_configure_link(dev, NULL, 0, NULL);
1859         if (err < 0)
1860                 goto err;
1861
1862         return dev;
1863 err:
1864         geneve_dellink(dev, &list_kill);
1865         unregister_netdevice_many(&list_kill);
1866         return ERR_PTR(err);
1867 }
1868 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1869
1870 static int geneve_netdevice_event(struct notifier_block *unused,
1871                                   unsigned long event, void *ptr)
1872 {
1873         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1874
1875         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1876                 geneve_offload_rx_ports(dev, true);
1877         else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1878                 geneve_offload_rx_ports(dev, false);
1879
1880         return NOTIFY_DONE;
1881 }
1882
1883 static struct notifier_block geneve_notifier_block __read_mostly = {
1884         .notifier_call = geneve_netdevice_event,
1885 };
1886
1887 static __net_init int geneve_init_net(struct net *net)
1888 {
1889         struct geneve_net *gn = net_generic(net, geneve_net_id);
1890
1891         INIT_LIST_HEAD(&gn->geneve_list);
1892         INIT_LIST_HEAD(&gn->sock_list);
1893         return 0;
1894 }
1895
1896 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1897 {
1898         struct geneve_net *gn = net_generic(net, geneve_net_id);
1899         struct geneve_dev *geneve, *next;
1900         struct net_device *dev, *aux;
1901
1902         /* gather any geneve devices that were moved into this ns */
1903         for_each_netdev_safe(net, dev, aux)
1904                 if (dev->rtnl_link_ops == &geneve_link_ops)
1905                         unregister_netdevice_queue(dev, head);
1906
1907         /* now gather any other geneve devices that were created in this ns */
1908         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1909                 /* If geneve->dev is in the same netns, it was already added
1910                  * to the list by the previous loop.
1911                  */
1912                 if (!net_eq(dev_net(geneve->dev), net))
1913                         unregister_netdevice_queue(geneve->dev, head);
1914         }
1915 }
1916
1917 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1918 {
1919         struct net *net;
1920         LIST_HEAD(list);
1921
1922         rtnl_lock();
1923         list_for_each_entry(net, net_list, exit_list)
1924                 geneve_destroy_tunnels(net, &list);
1925
1926         /* unregister the devices gathered above */
1927         unregister_netdevice_many(&list);
1928         rtnl_unlock();
1929
1930         list_for_each_entry(net, net_list, exit_list) {
1931                 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1932
1933                 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1934         }
1935 }
1936
1937 static struct pernet_operations geneve_net_ops = {
1938         .init = geneve_init_net,
1939         .exit_batch = geneve_exit_batch_net,
1940         .id   = &geneve_net_id,
1941         .size = sizeof(struct geneve_net),
1942 };
1943
1944 static int __init geneve_init_module(void)
1945 {
1946         int rc;
1947
1948         rc = register_pernet_subsys(&geneve_net_ops);
1949         if (rc)
1950                 goto out1;
1951
1952         rc = register_netdevice_notifier(&geneve_notifier_block);
1953         if (rc)
1954                 goto out2;
1955
1956         rc = rtnl_link_register(&geneve_link_ops);
1957         if (rc)
1958                 goto out3;
1959
1960         return 0;
1961 out3:
1962         unregister_netdevice_notifier(&geneve_notifier_block);
1963 out2:
1964         unregister_pernet_subsys(&geneve_net_ops);
1965 out1:
1966         return rc;
1967 }
1968 late_initcall(geneve_init_module);
1969
1970 static void __exit geneve_cleanup_module(void)
1971 {
1972         rtnl_link_unregister(&geneve_link_ops);
1973         unregister_netdevice_notifier(&geneve_notifier_block);
1974         unregister_pernet_subsys(&geneve_net_ops);
1975 }
1976 module_exit(geneve_cleanup_module);
1977
1978 MODULE_LICENSE("GPL");
1979 MODULE_VERSION(GENEVE_NETDEV_VER);
1980 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1981 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1982 MODULE_ALIAS_RTNL_LINK("geneve");