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/protocol.h>
  21
  22 #define GENEVE_NETDEV_VER       "0.6"
  23
  24 #define GENEVE_N_VID            (1u << 24)
  25 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  26
  27 #define VNI_HASH_BITS           10
  28 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  29
  30 static bool log_ecn_error = true;
  31 module_param(log_ecn_error, bool, 0644);
  32 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  33
  34 #define GENEVE_VER 0
  35 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  36 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  37 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  38
  39 /* per-network namespace private data for this module */
  40 struct geneve_net {
  41         struct list_head        geneve_list;
  42         struct list_head        sock_list;
  43 };
  44
  45 static unsigned int geneve_net_id;
  46
  47 struct geneve_dev_node {
  48         struct hlist_node hlist;
  49         struct geneve_dev *geneve;
  50 };
  51
  52 struct geneve_config {
  53         struct ip_tunnel_info   info;
  54         bool                    collect_md;
  55         bool                    use_udp6_rx_checksums;
  56         bool                    ttl_inherit;
  57         enum ifla_geneve_df     df;
  58 };
  59
  60 /* Pseudo network device */
  61 struct geneve_dev {
  62         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  63 #if IS_ENABLED(CONFIG_IPV6)
  64         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  65 #endif
  66         struct net         *net;        /* netns for packet i/o */
  67         struct net_device  *dev;        /* netdev for geneve tunnel */
  68         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  69 #if IS_ENABLED(CONFIG_IPV6)
  70         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  71 #endif
  72         struct list_head   next;        /* geneve's per namespace list */
  73         struct gro_cells   gro_cells;
  74         struct geneve_config cfg;
  75 };
  76
  77 struct geneve_sock {
  78         bool                    collect_md;
  79         struct list_head        list;
  80         struct socket           *sock;
  81         struct rcu_head         rcu;
  82         int                     refcnt;
  83         struct hlist_head       vni_list[VNI_HASH_SIZE];
  84 };
  85
  86 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  87 {
  88         __u32 vnid;
  89
  90         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  91         return hash_32(vnid, VNI_HASH_BITS);
  92 }
  93
  94 static __be64 vni_to_tunnel_id(const __u8 *vni)
  95 {
  96 #ifdef __BIG_ENDIAN
  97         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
  98 #else
  99         return (__force __be64)(((__force u64)vni[0] << 40) |
 100                                 ((__force u64)vni[1] << 48) |
 101                                 ((__force u64)vni[2] << 56));
 102 #endif
 103 }
 104
 105 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 106 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 107 {
 108 #ifdef __BIG_ENDIAN
 109         vni[0] = (__force __u8)(tun_id >> 16);
 110         vni[1] = (__force __u8)(tun_id >> 8);
 111         vni[2] = (__force __u8)tun_id;
 112 #else
 113         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 114         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 115         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 116 #endif
 117 }
 118
 119 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 120 {
 121         return !memcmp(vni, &tun_id[5], 3);
 122 }
 123
 124 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 125 {
 126         return gs->sock->sk->sk_family;
 127 }
 128
 129 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 130                                         __be32 addr, u8 vni[])
 131 {
 132         struct hlist_head *vni_list_head;
 133         struct geneve_dev_node *node;
 134         __u32 hash;
 135
 136         /* Find the device for this VNI */
 137         hash = geneve_net_vni_hash(vni);
 138         vni_list_head = &gs->vni_list[hash];
 139         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 140                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 141                     addr == node->geneve->cfg.info.key.u.ipv4.dst)
 142                         return node->geneve;
 143         }
 144         return NULL;
 145 }
 146
 147 #if IS_ENABLED(CONFIG_IPV6)
 148 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 149                                          struct in6_addr addr6, u8 vni[])
 150 {
 151         struct hlist_head *vni_list_head;
 152         struct geneve_dev_node *node;
 153         __u32 hash;
 154
 155         /* Find the device for this VNI */
 156         hash = geneve_net_vni_hash(vni);
 157         vni_list_head = &gs->vni_list[hash];
 158         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 159                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 160                     ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
 161                         return node->geneve;
 162         }
 163         return NULL;
 164 }
 165 #endif
 166
 167 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 168 {
 169         return (struct genevehdr *)(udp_hdr(skb) + 1);
 170 }
 171
 172 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 173                                             struct sk_buff *skb)
 174 {
 175         static u8 zero_vni[3];
 176         u8 *vni;
 177
 178         if (geneve_get_sk_family(gs) == AF_INET) {
 179                 struct iphdr *iph;
 180                 __be32 addr;
 181
 182                 iph = ip_hdr(skb); /* outer IP header... */
 183
 184                 if (gs->collect_md) {
 185                         vni = zero_vni;
 186                         addr = 0;
 187                 } else {
 188                         vni = geneve_hdr(skb)->vni;
 189                         addr = iph->saddr;
 190                 }
 191
 192                 return geneve_lookup(gs, addr, vni);
 193 #if IS_ENABLED(CONFIG_IPV6)
 194         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 195                 static struct in6_addr zero_addr6;
 196                 struct ipv6hdr *ip6h;
 197                 struct in6_addr addr6;
 198
 199                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 200
 201                 if (gs->collect_md) {
 202                         vni = zero_vni;
 203                         addr6 = zero_addr6;
 204                 } else {
 205                         vni = geneve_hdr(skb)->vni;
 206                         addr6 = ip6h->saddr;
 207                 }
 208
 209                 return geneve6_lookup(gs, addr6, vni);
 210 #endif
 211         }
 212         return NULL;
 213 }
 214
 215 /* geneve receive/decap routine */
 216 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 217                       struct sk_buff *skb)
 218 {
 219         struct genevehdr *gnvh = geneve_hdr(skb);
 220         struct metadata_dst *tun_dst = NULL;
 221         unsigned int len;
 222         int err = 0;
 223         void *oiph;
 224
 225         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 226                 __be16 flags;
 227
 228                 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
 229                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 230
 231                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 232                                          vni_to_tunnel_id(gnvh->vni),
 233                                          gnvh->opt_len * 4);
 234                 if (!tun_dst) {
 235                         geneve->dev->stats.rx_dropped++;
 236                         goto drop;
 237                 }
 238                 /* Update tunnel dst according to Geneve options. */
 239                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 240                                         gnvh->options, gnvh->opt_len * 4,
 241                                         TUNNEL_GENEVE_OPT);
 242         } else {
 243                 /* Drop packets w/ critical options,
 244                  * since we don't support any...
 245                  */
 246                 if (gnvh->critical) {
 247                         geneve->dev->stats.rx_frame_errors++;
 248                         geneve->dev->stats.rx_errors++;
 249                         goto drop;
 250                 }
 251         }
 252
 253         skb_reset_mac_header(skb);
 254         skb->protocol = eth_type_trans(skb, geneve->dev);
 255         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 256
 257         if (tun_dst)
 258                 skb_dst_set(skb, &tun_dst->dst);
 259
 260         /* Ignore packet loops (and multicast echo) */
 261         if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
 262                 geneve->dev->stats.rx_errors++;
 263                 goto drop;
 264         }
 265
 266         oiph = skb_network_header(skb);
 267         skb_reset_network_header(skb);
 268
 269         if (geneve_get_sk_family(gs) == AF_INET)
 270                 err = IP_ECN_decapsulate(oiph, skb);
 271 #if IS_ENABLED(CONFIG_IPV6)
 272         else
 273                 err = IP6_ECN_decapsulate(oiph, skb);
 274 #endif
 275
 276         if (unlikely(err)) {
 277                 if (log_ecn_error) {
 278                         if (geneve_get_sk_family(gs) == AF_INET)
 279                                 net_info_ratelimited("non-ECT from %pI4 "
 280                                                      "with TOS=%#x\n",
 281                                                      &((struct iphdr *)oiph)->saddr,
 282                                                      ((struct iphdr *)oiph)->tos);
 283 #if IS_ENABLED(CONFIG_IPV6)
 284                         else
 285                                 net_info_ratelimited("non-ECT from %pI6\n",
 286                                                      &((struct ipv6hdr *)oiph)->saddr);
 287 #endif
 288                 }
 289                 if (err > 1) {
 290                         ++geneve->dev->stats.rx_frame_errors;
 291                         ++geneve->dev->stats.rx_errors;
 292                         goto drop;
 293                 }
 294         }
 295
 296         len = skb->len;
 297         err = gro_cells_receive(&geneve->gro_cells, skb);
 298         if (likely(err == NET_RX_SUCCESS))
 299                 dev_sw_netstats_rx_add(geneve->dev, len);
 300
 301         return;
 302 drop:
 303         /* Consume bad packet */
 304         kfree_skb(skb);
 305 }
 306
 307 /* Setup stats when device is created */
 308 static int geneve_init(struct net_device *dev)
 309 {
 310         struct geneve_dev *geneve = netdev_priv(dev);
 311         int err;
 312
 313         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 314         if (!dev->tstats)
 315                 return -ENOMEM;
 316
 317         err = gro_cells_init(&geneve->gro_cells, dev);
 318         if (err) {
 319                 free_percpu(dev->tstats);
 320                 return err;
 321         }
 322
 323         err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
 324         if (err) {
 325                 free_percpu(dev->tstats);
 326                 gro_cells_destroy(&geneve->gro_cells);
 327                 return err;
 328         }
 329         return 0;
 330 }
 331
 332 static void geneve_uninit(struct net_device *dev)
 333 {
 334         struct geneve_dev *geneve = netdev_priv(dev);
 335
 336         dst_cache_destroy(&geneve->cfg.info.dst_cache);
 337         gro_cells_destroy(&geneve->gro_cells);
 338         free_percpu(dev->tstats);
 339 }
 340
 341 /* Callback from net/ipv4/udp.c to receive packets */
 342 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 343 {
 344         struct genevehdr *geneveh;
 345         struct geneve_dev *geneve;
 346         struct geneve_sock *gs;
 347         int opts_len;
 348
 349         /* Need UDP and Geneve header to be present */
 350         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 351                 goto drop;
 352
 353         /* Return packets with reserved bits set */
 354         geneveh = geneve_hdr(skb);
 355         if (unlikely(geneveh->ver != GENEVE_VER))
 356                 goto drop;
 357
 358         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 359                 goto drop;
 360
 361         gs = rcu_dereference_sk_user_data(sk);
 362         if (!gs)
 363                 goto drop;
 364
 365         geneve = geneve_lookup_skb(gs, skb);
 366         if (!geneve)
 367                 goto drop;
 368
 369         opts_len = geneveh->opt_len * 4;
 370         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 371                                  htons(ETH_P_TEB),
 372                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 373                 geneve->dev->stats.rx_dropped++;
 374                 goto drop;
 375         }
 376
 377         geneve_rx(geneve, gs, skb);
 378         return 0;
 379
 380 drop:
 381         /* Consume bad packet */
 382         kfree_skb(skb);
 383         return 0;
 384 }
 385
 386 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
 387 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
 388 {
 389         struct genevehdr *geneveh;
 390         struct geneve_sock *gs;
 391         u8 zero_vni[3] = { 0 };
 392         u8 *vni = zero_vni;
 393
 394         if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
 395                 return -EINVAL;
 396
 397         geneveh = geneve_hdr(skb);
 398         if (geneveh->ver != GENEVE_VER)
 399                 return -EINVAL;
 400
 401         if (geneveh->proto_type != htons(ETH_P_TEB))
 402                 return -EINVAL;
 403
 404         gs = rcu_dereference_sk_user_data(sk);
 405         if (!gs)
 406                 return -ENOENT;
 407
 408         if (geneve_get_sk_family(gs) == AF_INET) {
 409                 struct iphdr *iph = ip_hdr(skb);
 410                 __be32 addr4 = 0;
 411
 412                 if (!gs->collect_md) {
 413                         vni = geneve_hdr(skb)->vni;
 414                         addr4 = iph->daddr;
 415                 }
 416
 417                 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
 418         }
 419
 420 #if IS_ENABLED(CONFIG_IPV6)
 421         if (geneve_get_sk_family(gs) == AF_INET6) {
 422                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 423                 struct in6_addr addr6;
 424
 425                 memset(&addr6, 0, sizeof(struct in6_addr));
 426
 427                 if (!gs->collect_md) {
 428                         vni = geneve_hdr(skb)->vni;
 429                         addr6 = ip6h->daddr;
 430                 }
 431
 432                 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
 433         }
 434 #endif
 435
 436         return -EPFNOSUPPORT;
 437 }
 438
 439 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 440                                          __be16 port, bool ipv6_rx_csum)
 441 {
 442         struct socket *sock;
 443         struct udp_port_cfg udp_conf;
 444         int err;
 445
 446         memset(&udp_conf, 0, sizeof(udp_conf));
 447
 448         if (ipv6) {
 449                 udp_conf.family = AF_INET6;
 450                 udp_conf.ipv6_v6only = 1;
 451                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 452         } else {
 453                 udp_conf.family = AF_INET;
 454                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 455         }
 456
 457         udp_conf.local_udp_port = port;
 458
 459         /* Open UDP socket */
 460         err = udp_sock_create(net, &udp_conf, &sock);
 461         if (err < 0)
 462                 return ERR_PTR(err);
 463
 464         return sock;
 465 }
 466
 467 static int geneve_hlen(struct genevehdr *gh)
 468 {
 469         return sizeof(*gh) + gh->opt_len * 4;
 470 }
 471
 472 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 473                                           struct list_head *head,
 474                                           struct sk_buff *skb)
 475 {
 476         struct sk_buff *pp = NULL;
 477         struct sk_buff *p;
 478         struct genevehdr *gh, *gh2;
 479         unsigned int hlen, gh_len, off_gnv;
 480         const struct packet_offload *ptype;
 481         __be16 type;
 482         int flush = 1;
 483
 484         off_gnv = skb_gro_offset(skb);
 485         hlen = off_gnv + sizeof(*gh);
 486         gh = skb_gro_header_fast(skb, off_gnv);
 487         if (skb_gro_header_hard(skb, hlen)) {
 488                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 489                 if (unlikely(!gh))
 490                         goto out;
 491         }
 492
 493         if (gh->ver != GENEVE_VER || gh->oam)
 494                 goto out;
 495         gh_len = geneve_hlen(gh);
 496
 497         hlen = off_gnv + gh_len;
 498         if (skb_gro_header_hard(skb, hlen)) {
 499                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 500                 if (unlikely(!gh))
 501                         goto out;
 502         }
 503
 504         list_for_each_entry(p, head, list) {
 505                 if (!NAPI_GRO_CB(p)->same_flow)
 506                         continue;
 507
 508                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 509                 if (gh->opt_len != gh2->opt_len ||
 510                     memcmp(gh, gh2, gh_len)) {
 511                         NAPI_GRO_CB(p)->same_flow = 0;
 512                         continue;
 513                 }
 514         }
 515
 516         type = gh->proto_type;
 517
 518         rcu_read_lock();
 519         ptype = gro_find_receive_by_type(type);
 520         if (!ptype)
 521                 goto out_unlock;
 522
 523         skb_gro_pull(skb, gh_len);
 524         skb_gro_postpull_rcsum(skb, gh, gh_len);
 525         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 526         flush = 0;
 527
 528 out_unlock:
 529         rcu_read_unlock();
 530 out:
 531         skb_gro_flush_final(skb, pp, flush);
 532
 533         return pp;
 534 }
 535
 536 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 537                                int nhoff)
 538 {
 539         struct genevehdr *gh;
 540         struct packet_offload *ptype;
 541         __be16 type;
 542         int gh_len;
 543         int err = -ENOSYS;
 544
 545         gh = (struct genevehdr *)(skb->data + nhoff);
 546         gh_len = geneve_hlen(gh);
 547         type = gh->proto_type;
 548
 549         rcu_read_lock();
 550         ptype = gro_find_complete_by_type(type);
 551         if (ptype)
 552                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 553
 554         rcu_read_unlock();
 555
 556         skb_set_inner_mac_header(skb, nhoff + gh_len);
 557
 558         return err;
 559 }
 560
 561 /* Create new listen socket if needed */
 562 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 563                                                 bool ipv6, bool ipv6_rx_csum)
 564 {
 565         struct geneve_net *gn = net_generic(net, geneve_net_id);
 566         struct geneve_sock *gs;
 567         struct socket *sock;
 568         struct udp_tunnel_sock_cfg tunnel_cfg;
 569         int h;
 570
 571         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 572         if (!gs)
 573                 return ERR_PTR(-ENOMEM);
 574
 575         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 576         if (IS_ERR(sock)) {
 577                 kfree(gs);
 578                 return ERR_CAST(sock);
 579         }
 580
 581         gs->sock = sock;
 582         gs->refcnt = 1;
 583         for (h = 0; h < VNI_HASH_SIZE; ++h)
 584                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 585
 586         /* Initialize the geneve udp offloads structure */
 587         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 588
 589         /* Mark socket as an encapsulation socket */
 590         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 591         tunnel_cfg.sk_user_data = gs;
 592         tunnel_cfg.encap_type = 1;
 593         tunnel_cfg.gro_receive = geneve_gro_receive;
 594         tunnel_cfg.gro_complete = geneve_gro_complete;
 595         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 596         tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
 597         tunnel_cfg.encap_destroy = NULL;
 598         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 599         list_add(&gs->list, &gn->sock_list);
 600         return gs;
 601 }
 602
 603 static void __geneve_sock_release(struct geneve_sock *gs)
 604 {
 605         if (!gs || --gs->refcnt)
 606                 return;
 607
 608         list_del(&gs->list);
 609         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 610         udp_tunnel_sock_release(gs->sock);
 611         kfree_rcu(gs, rcu);
 612 }
 613
 614 static void geneve_sock_release(struct geneve_dev *geneve)
 615 {
 616         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 617 #if IS_ENABLED(CONFIG_IPV6)
 618         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 619
 620         rcu_assign_pointer(geneve->sock6, NULL);
 621 #endif
 622
 623         rcu_assign_pointer(geneve->sock4, NULL);
 624         synchronize_net();
 625
 626         __geneve_sock_release(gs4);
 627 #if IS_ENABLED(CONFIG_IPV6)
 628         __geneve_sock_release(gs6);
 629 #endif
 630 }
 631
 632 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 633                                             sa_family_t family,
 634                                             __be16 dst_port)
 635 {
 636         struct geneve_sock *gs;
 637
 638         list_for_each_entry(gs, &gn->sock_list, list) {
 639                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 640                     geneve_get_sk_family(gs) == family) {
 641                         return gs;
 642                 }
 643         }
 644         return NULL;
 645 }
 646
 647 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 648 {
 649         struct net *net = geneve->net;
 650         struct geneve_net *gn = net_generic(net, geneve_net_id);
 651         struct geneve_dev_node *node;
 652         struct geneve_sock *gs;
 653         __u8 vni[3];
 654         __u32 hash;
 655
 656         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
 657         if (gs) {
 658                 gs->refcnt++;
 659                 goto out;
 660         }
 661
 662         gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
 663                                   geneve->cfg.use_udp6_rx_checksums);
 664         if (IS_ERR(gs))
 665                 return PTR_ERR(gs);
 666
 667 out:
 668         gs->collect_md = geneve->cfg.collect_md;
 669 #if IS_ENABLED(CONFIG_IPV6)
 670         if (ipv6) {
 671                 rcu_assign_pointer(geneve->sock6, gs);
 672                 node = &geneve->hlist6;
 673         } else
 674 #endif
 675         {
 676                 rcu_assign_pointer(geneve->sock4, gs);
 677                 node = &geneve->hlist4;
 678         }
 679         node->geneve = geneve;
 680
 681         tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
 682         hash = geneve_net_vni_hash(vni);
 683         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 684         return 0;
 685 }
 686
 687 static int geneve_open(struct net_device *dev)
 688 {
 689         struct geneve_dev *geneve = netdev_priv(dev);
 690         bool metadata = geneve->cfg.collect_md;
 691         bool ipv4, ipv6;
 692         int ret = 0;
 693
 694         ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
 695         ipv4 = !ipv6 || metadata;
 696 #if IS_ENABLED(CONFIG_IPV6)
 697         if (ipv6) {
 698                 ret = geneve_sock_add(geneve, true);
 699                 if (ret < 0 && ret != -EAFNOSUPPORT)
 700                         ipv4 = false;
 701         }
 702 #endif
 703         if (ipv4)
 704                 ret = geneve_sock_add(geneve, false);
 705         if (ret < 0)
 706                 geneve_sock_release(geneve);
 707
 708         return ret;
 709 }
 710
 711 static int geneve_stop(struct net_device *dev)
 712 {
 713         struct geneve_dev *geneve = netdev_priv(dev);
 714
 715         hlist_del_init_rcu(&geneve->hlist4.hlist);
 716 #if IS_ENABLED(CONFIG_IPV6)
 717         hlist_del_init_rcu(&geneve->hlist6.hlist);
 718 #endif
 719         geneve_sock_release(geneve);
 720         return 0;
 721 }
 722
 723 static void geneve_build_header(struct genevehdr *geneveh,
 724                                 const struct ip_tunnel_info *info)
 725 {
 726         geneveh->ver = GENEVE_VER;
 727         geneveh->opt_len = info->options_len / 4;
 728         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 729         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 730         geneveh->rsvd1 = 0;
 731         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 732         geneveh->proto_type = htons(ETH_P_TEB);
 733         geneveh->rsvd2 = 0;
 734
 735         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 736                 ip_tunnel_info_opts_get(geneveh->options, info);
 737 }
 738
 739 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 740                             const struct ip_tunnel_info *info,
 741                             bool xnet, int ip_hdr_len)
 742 {
 743         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 744         struct genevehdr *gnvh;
 745         int min_headroom;
 746         int err;
 747
 748         skb_reset_mac_header(skb);
 749         skb_scrub_packet(skb, xnet);
 750
 751         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 752                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 753         err = skb_cow_head(skb, min_headroom);
 754         if (unlikely(err))
 755                 goto free_dst;
 756
 757         err = udp_tunnel_handle_offloads(skb, udp_sum);
 758         if (err)
 759                 goto free_dst;
 760
 761         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 762         geneve_build_header(gnvh, info);
 763         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 764         return 0;
 765
 766 free_dst:
 767         dst_release(dst);
 768         return err;
 769 }
 770
 771 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 772                                        struct net_device *dev,
 773                                        struct geneve_sock *gs4,
 774                                        struct flowi4 *fl4,
 775                                        const struct ip_tunnel_info *info,
 776                                        __be16 dport, __be16 sport)
 777 {
 778         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 779         struct geneve_dev *geneve = netdev_priv(dev);
 780         struct dst_cache *dst_cache;
 781         struct rtable *rt = NULL;
 782         __u8 tos;
 783
 784         if (!gs4)
 785                 return ERR_PTR(-EIO);
 786
 787         memset(fl4, 0, sizeof(*fl4));
 788         fl4->flowi4_mark = skb->mark;
 789         fl4->flowi4_proto = IPPROTO_UDP;
 790         fl4->daddr = info->key.u.ipv4.dst;
 791         fl4->saddr = info->key.u.ipv4.src;
 792         fl4->fl4_dport = dport;
 793         fl4->fl4_sport = sport;
 794
 795         tos = info->key.tos;
 796         if ((tos == 1) && !geneve->cfg.collect_md) {
 797                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 798                 use_cache = false;
 799         }
 800         fl4->flowi4_tos = RT_TOS(tos);
 801
 802         dst_cache = (struct dst_cache *)&info->dst_cache;
 803         if (use_cache) {
 804                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 805                 if (rt)
 806                         return rt;
 807         }
 808         rt = ip_route_output_key(geneve->net, fl4);
 809         if (IS_ERR(rt)) {
 810                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 811                 return ERR_PTR(-ENETUNREACH);
 812         }
 813         if (rt->dst.dev == dev) { /* is this necessary? */
 814                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 815                 ip_rt_put(rt);
 816                 return ERR_PTR(-ELOOP);
 817         }
 818         if (use_cache)
 819                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 820         return rt;
 821 }
 822
 823 #if IS_ENABLED(CONFIG_IPV6)
 824 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 825                                            struct net_device *dev,
 826                                            struct geneve_sock *gs6,
 827                                            struct flowi6 *fl6,
 828                                            const struct ip_tunnel_info *info,
 829                                            __be16 dport, __be16 sport)
 830 {
 831         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 832         struct geneve_dev *geneve = netdev_priv(dev);
 833         struct dst_entry *dst = NULL;
 834         struct dst_cache *dst_cache;
 835         __u8 prio;
 836
 837         if (!gs6)
 838                 return ERR_PTR(-EIO);
 839
 840         memset(fl6, 0, sizeof(*fl6));
 841         fl6->flowi6_mark = skb->mark;
 842         fl6->flowi6_proto = IPPROTO_UDP;
 843         fl6->daddr = info->key.u.ipv6.dst;
 844         fl6->saddr = info->key.u.ipv6.src;
 845         fl6->fl6_dport = dport;
 846         fl6->fl6_sport = sport;
 847
 848         prio = info->key.tos;
 849         if ((prio == 1) && !geneve->cfg.collect_md) {
 850                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 851                 use_cache = false;
 852         }
 853
 854         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 855                                            info->key.label);
 856         dst_cache = (struct dst_cache *)&info->dst_cache;
 857         if (use_cache) {
 858                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 859                 if (dst)
 860                         return dst;
 861         }
 862         dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
 863                                               NULL);
 864         if (IS_ERR(dst)) {
 865                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 866                 return ERR_PTR(-ENETUNREACH);
 867         }
 868         if (dst->dev == dev) { /* is this necessary? */
 869                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 870                 dst_release(dst);
 871                 return ERR_PTR(-ELOOP);
 872         }
 873
 874         if (use_cache)
 875                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 876         return dst;
 877 }
 878 #endif
 879
 880 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 881                            struct geneve_dev *geneve,
 882                            const struct ip_tunnel_info *info)
 883 {
 884         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 885         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 886         const struct ip_tunnel_key *key = &info->key;
 887         struct rtable *rt;
 888         struct flowi4 fl4;
 889         __u8 tos, ttl;
 890         __be16 df = 0;
 891         __be16 sport;
 892         int err;
 893
 894         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 895         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
 896                               geneve->cfg.info.key.tp_dst, sport);
 897         if (IS_ERR(rt))
 898                 return PTR_ERR(rt);
 899
 900         err = skb_tunnel_check_pmtu(skb, &rt->dst,
 901                                     GENEVE_IPV4_HLEN + info->options_len,
 902                                     netif_is_any_bridge_port(dev));
 903         if (err < 0) {
 904                 dst_release(&rt->dst);
 905                 return err;
 906         } else if (err) {
 907                 struct ip_tunnel_info *info;
 908
 909                 info = skb_tunnel_info(skb);
 910                 if (info) {
 911                         struct ip_tunnel_info *unclone;
 912
 913                         unclone = skb_tunnel_info_unclone(skb);
 914                         if (unlikely(!unclone)) {
 915                                 dst_release(&rt->dst);
 916                                 return -ENOMEM;
 917                         }
 918
 919                         unclone->key.u.ipv4.dst = fl4.saddr;
 920                         unclone->key.u.ipv4.src = fl4.daddr;
 921                 }
 922
 923                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 924                         dst_release(&rt->dst);
 925                         return -EINVAL;
 926                 }
 927
 928                 skb->protocol = eth_type_trans(skb, geneve->dev);
 929                 netif_rx(skb);
 930                 dst_release(&rt->dst);
 931                 return -EMSGSIZE;
 932         }
 933
 934         if (geneve->cfg.collect_md) {
 935                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 936                 ttl = key->ttl;
 937
 938                 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 939         } else {
 940                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 941                 if (geneve->cfg.ttl_inherit)
 942                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 943                 else
 944                         ttl = key->ttl;
 945                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 946
 947                 if (geneve->cfg.df == GENEVE_DF_SET) {
 948                         df = htons(IP_DF);
 949                 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
 950                         struct ethhdr *eth = eth_hdr(skb);
 951
 952                         if (ntohs(eth->h_proto) == ETH_P_IPV6) {
 953                                 df = htons(IP_DF);
 954                         } else if (ntohs(eth->h_proto) == ETH_P_IP) {
 955                                 struct iphdr *iph = ip_hdr(skb);
 956
 957                                 if (iph->frag_off & htons(IP_DF))
 958                                         df = htons(IP_DF);
 959                         }
 960                 }
 961         }
 962
 963         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 964         if (unlikely(err))
 965                 return err;
 966
 967         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 968                             tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
 969                             !net_eq(geneve->net, dev_net(geneve->dev)),
 970                             !(info->key.tun_flags & TUNNEL_CSUM));
 971         return 0;
 972 }
 973
 974 #if IS_ENABLED(CONFIG_IPV6)
 975 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 976                             struct geneve_dev *geneve,
 977                             const struct ip_tunnel_info *info)
 978 {
 979         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 980         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 981         const struct ip_tunnel_key *key = &info->key;
 982         struct dst_entry *dst = NULL;
 983         struct flowi6 fl6;
 984         __u8 prio, ttl;
 985         __be16 sport;
 986         int err;
 987
 988         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 989         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
 990                                 geneve->cfg.info.key.tp_dst, sport);
 991         if (IS_ERR(dst))
 992                 return PTR_ERR(dst);
 993
 994         err = skb_tunnel_check_pmtu(skb, dst,
 995                                     GENEVE_IPV6_HLEN + info->options_len,
 996                                     netif_is_any_bridge_port(dev));
 997         if (err < 0) {
 998                 dst_release(dst);
 999                 return err;
1000         } else if (err) {
1001                 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1002
1003                 if (info) {
1004                         struct ip_tunnel_info *unclone;
1005
1006                         unclone = skb_tunnel_info_unclone(skb);
1007                         if (unlikely(!unclone)) {
1008                                 dst_release(dst);
1009                                 return -ENOMEM;
1010                         }
1011
1012                         unclone->key.u.ipv6.dst = fl6.saddr;
1013                         unclone->key.u.ipv6.src = fl6.daddr;
1014                 }
1015
1016                 if (!pskb_may_pull(skb, ETH_HLEN)) {
1017                         dst_release(dst);
1018                         return -EINVAL;
1019                 }
1020
1021                 skb->protocol = eth_type_trans(skb, geneve->dev);
1022                 netif_rx(skb);
1023                 dst_release(dst);
1024                 return -EMSGSIZE;
1025         }
1026
1027         if (geneve->cfg.collect_md) {
1028                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1029                 ttl = key->ttl;
1030         } else {
1031                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1032                                            ip_hdr(skb), skb);
1033                 if (geneve->cfg.ttl_inherit)
1034                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1035                 else
1036                         ttl = key->ttl;
1037                 ttl = ttl ? : ip6_dst_hoplimit(dst);
1038         }
1039         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
1040         if (unlikely(err))
1041                 return err;
1042
1043         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1044                              &fl6.saddr, &fl6.daddr, prio, ttl,
1045                              info->key.label, sport, geneve->cfg.info.key.tp_dst,
1046                              !(info->key.tun_flags & TUNNEL_CSUM));
1047         return 0;
1048 }
1049 #endif
1050
1051 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1052 {
1053         struct geneve_dev *geneve = netdev_priv(dev);
1054         struct ip_tunnel_info *info = NULL;
1055         int err;
1056
1057         if (geneve->cfg.collect_md) {
1058                 info = skb_tunnel_info(skb);
1059                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1060                         netdev_dbg(dev, "no tunnel metadata\n");
1061                         dev_kfree_skb(skb);
1062                         dev->stats.tx_dropped++;
1063                         return NETDEV_TX_OK;
1064                 }
1065         } else {
1066                 info = &geneve->cfg.info;
1067         }
1068
1069         rcu_read_lock();
1070 #if IS_ENABLED(CONFIG_IPV6)
1071         if (info->mode & IP_TUNNEL_INFO_IPV6)
1072                 err = geneve6_xmit_skb(skb, dev, geneve, info);
1073         else
1074 #endif
1075                 err = geneve_xmit_skb(skb, dev, geneve, info);
1076         rcu_read_unlock();
1077
1078         if (likely(!err))
1079                 return NETDEV_TX_OK;
1080
1081         if (err != -EMSGSIZE)
1082                 dev_kfree_skb(skb);
1083
1084         if (err == -ELOOP)
1085                 dev->stats.collisions++;
1086         else if (err == -ENETUNREACH)
1087                 dev->stats.tx_carrier_errors++;
1088
1089         dev->stats.tx_errors++;
1090         return NETDEV_TX_OK;
1091 }
1092
1093 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1094 {
1095         if (new_mtu > dev->max_mtu)
1096                 new_mtu = dev->max_mtu;
1097         else if (new_mtu < dev->min_mtu)
1098                 new_mtu = dev->min_mtu;
1099
1100         dev->mtu = new_mtu;
1101         return 0;
1102 }
1103
1104 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1105 {
1106         struct ip_tunnel_info *info = skb_tunnel_info(skb);
1107         struct geneve_dev *geneve = netdev_priv(dev);
1108         __be16 sport;
1109
1110         if (ip_tunnel_info_af(info) == AF_INET) {
1111                 struct rtable *rt;
1112                 struct flowi4 fl4;
1113
1114                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1115                 sport = udp_flow_src_port(geneve->net, skb,
1116                                           1, USHRT_MAX, true);
1117
1118                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
1119                                       geneve->cfg.info.key.tp_dst, sport);
1120                 if (IS_ERR(rt))
1121                         return PTR_ERR(rt);
1122
1123                 ip_rt_put(rt);
1124                 info->key.u.ipv4.src = fl4.saddr;
1125 #if IS_ENABLED(CONFIG_IPV6)
1126         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1127                 struct dst_entry *dst;
1128                 struct flowi6 fl6;
1129
1130                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1131                 sport = udp_flow_src_port(geneve->net, skb,
1132                                           1, USHRT_MAX, true);
1133
1134                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1135                                         geneve->cfg.info.key.tp_dst, sport);
1136                 if (IS_ERR(dst))
1137                         return PTR_ERR(dst);
1138
1139                 dst_release(dst);
1140                 info->key.u.ipv6.src = fl6.saddr;
1141 #endif
1142         } else {
1143                 return -EINVAL;
1144         }
1145
1146         info->key.tp_src = sport;
1147         info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1148         return 0;
1149 }
1150
1151 static const struct net_device_ops geneve_netdev_ops = {
1152         .ndo_init               = geneve_init,
1153         .ndo_uninit             = geneve_uninit,
1154         .ndo_open               = geneve_open,
1155         .ndo_stop               = geneve_stop,
1156         .ndo_start_xmit         = geneve_xmit,
1157         .ndo_get_stats64        = dev_get_tstats64,
1158         .ndo_change_mtu         = geneve_change_mtu,
1159         .ndo_validate_addr      = eth_validate_addr,
1160         .ndo_set_mac_address    = eth_mac_addr,
1161         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1162 };
1163
1164 static void geneve_get_drvinfo(struct net_device *dev,
1165                                struct ethtool_drvinfo *drvinfo)
1166 {
1167         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1168         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1169 }
1170
1171 static const struct ethtool_ops geneve_ethtool_ops = {
1172         .get_drvinfo    = geneve_get_drvinfo,
1173         .get_link       = ethtool_op_get_link,
1174 };
1175
1176 /* Info for udev, that this is a virtual tunnel endpoint */
1177 static struct device_type geneve_type = {
1178         .name = "geneve",
1179 };
1180
1181 /* Calls the ndo_udp_tunnel_add of the caller in order to
1182  * supply the listening GENEVE udp ports. Callers are expected
1183  * to implement the ndo_udp_tunnel_add.
1184  */
1185 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1186 {
1187         struct net *net = dev_net(dev);
1188         struct geneve_net *gn = net_generic(net, geneve_net_id);
1189         struct geneve_sock *gs;
1190
1191         rcu_read_lock();
1192         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1193                 if (push) {
1194                         udp_tunnel_push_rx_port(dev, gs->sock,
1195                                                 UDP_TUNNEL_TYPE_GENEVE);
1196                 } else {
1197                         udp_tunnel_drop_rx_port(dev, gs->sock,
1198                                                 UDP_TUNNEL_TYPE_GENEVE);
1199                 }
1200         }
1201         rcu_read_unlock();
1202 }
1203
1204 /* Initialize the device structure. */
1205 static void geneve_setup(struct net_device *dev)
1206 {
1207         ether_setup(dev);
1208
1209         dev->netdev_ops = &geneve_netdev_ops;
1210         dev->ethtool_ops = &geneve_ethtool_ops;
1211         dev->needs_free_netdev = true;
1212
1213         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1214
1215         dev->features    |= NETIF_F_LLTX;
1216         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1217         dev->features    |= NETIF_F_RXCSUM;
1218         dev->features    |= NETIF_F_GSO_SOFTWARE;
1219
1220         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
1221         dev->hw_features |= NETIF_F_RXCSUM;
1222         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1223
1224         /* MTU range: 68 - (something less than 65535) */
1225         dev->min_mtu = ETH_MIN_MTU;
1226         /* The max_mtu calculation does not take account of GENEVE
1227          * options, to avoid excluding potentially valid
1228          * configurations. This will be further reduced by IPvX hdr size.
1229          */
1230         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1231
1232         netif_keep_dst(dev);
1233         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1234         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1235         eth_hw_addr_random(dev);
1236 }
1237
1238 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1239         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1240         [IFLA_GENEVE_REMOTE]            = { .len = sizeof_field(struct iphdr, daddr) },
1241         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1242         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1243         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1244         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1245         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1246         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1247         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1248         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1249         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1250         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1251         [IFLA_GENEVE_DF]                = { .type = NLA_U8 },
1252 };
1253
1254 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1255                            struct netlink_ext_ack *extack)
1256 {
1257         if (tb[IFLA_ADDRESS]) {
1258                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1259                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1260                                             "Provided link layer address is not Ethernet");
1261                         return -EINVAL;
1262                 }
1263
1264                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1265                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1266                                             "Provided Ethernet address is not unicast");
1267                         return -EADDRNOTAVAIL;
1268                 }
1269         }
1270
1271         if (!data) {
1272                 NL_SET_ERR_MSG(extack,
1273                                "Not enough attributes provided to perform the operation");
1274                 return -EINVAL;
1275         }
1276
1277         if (data[IFLA_GENEVE_ID]) {
1278                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1279
1280                 if (vni >= GENEVE_N_VID) {
1281                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1282                                             "Geneve ID must be lower than 16777216");
1283                         return -ERANGE;
1284                 }
1285         }
1286
1287         if (data[IFLA_GENEVE_DF]) {
1288                 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1289
1290                 if (df < 0 || df > GENEVE_DF_MAX) {
1291                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1292                                             "Invalid DF attribute");
1293                         return -EINVAL;
1294                 }
1295         }
1296
1297         return 0;
1298 }
1299
1300 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1301                                           const struct ip_tunnel_info *info,
1302                                           bool *tun_on_same_port,
1303                                           bool *tun_collect_md)
1304 {
1305         struct geneve_dev *geneve, *t = NULL;
1306
1307         *tun_on_same_port = false;
1308         *tun_collect_md = false;
1309         list_for_each_entry(geneve, &gn->geneve_list, next) {
1310                 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1311                         *tun_collect_md = geneve->cfg.collect_md;
1312                         *tun_on_same_port = true;
1313                 }
1314                 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1315                     info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1316                     !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1317                         t = geneve;
1318         }
1319         return t;
1320 }
1321
1322 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1323 {
1324         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1325                  info->key.ttl || info->key.label || info->key.tp_src ||
1326                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1327 }
1328
1329 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1330                                   struct ip_tunnel_info *b)
1331 {
1332         if (ip_tunnel_info_af(a) == AF_INET)
1333                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1334         else
1335                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1336 }
1337
1338 static int geneve_configure(struct net *net, struct net_device *dev,
1339                             struct netlink_ext_ack *extack,
1340                             const struct geneve_config *cfg)
1341 {
1342         struct geneve_net *gn = net_generic(net, geneve_net_id);
1343         struct geneve_dev *t, *geneve = netdev_priv(dev);
1344         const struct ip_tunnel_info *info = &cfg->info;
1345         bool tun_collect_md, tun_on_same_port;
1346         int err, encap_len;
1347
1348         if (cfg->collect_md && !is_tnl_info_zero(info)) {
1349                 NL_SET_ERR_MSG(extack,
1350                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1351                 return -EINVAL;
1352         }
1353
1354         geneve->net = net;
1355         geneve->dev = dev;
1356
1357         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1358         if (t)
1359                 return -EBUSY;
1360
1361         /* make enough headroom for basic scenario */
1362         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1363         if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1364                 encap_len += sizeof(struct iphdr);
1365                 dev->max_mtu -= sizeof(struct iphdr);
1366         } else {
1367                 encap_len += sizeof(struct ipv6hdr);
1368                 dev->max_mtu -= sizeof(struct ipv6hdr);
1369         }
1370         dev->needed_headroom = encap_len + ETH_HLEN;
1371
1372         if (cfg->collect_md) {
1373                 if (tun_on_same_port) {
1374                         NL_SET_ERR_MSG(extack,
1375                                        "There can be only one externally controlled device on a destination port");
1376                         return -EPERM;
1377                 }
1378         } else {
1379                 if (tun_collect_md) {
1380                         NL_SET_ERR_MSG(extack,
1381                                        "There already exists an externally controlled device on this destination port");
1382                         return -EPERM;
1383                 }
1384         }
1385
1386         dst_cache_reset(&geneve->cfg.info.dst_cache);
1387         memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1388
1389         err = register_netdevice(dev);
1390         if (err)
1391                 return err;
1392
1393         list_add(&geneve->next, &gn->geneve_list);
1394         return 0;
1395 }
1396
1397 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1398 {
1399         memset(info, 0, sizeof(*info));
1400         info->key.tp_dst = htons(dst_port);
1401 }
1402
1403 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1404                           struct netlink_ext_ack *extack,
1405                           struct geneve_config *cfg, bool changelink)
1406 {
1407         struct ip_tunnel_info *info = &cfg->info;
1408         int attrtype;
1409
1410         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1411                 NL_SET_ERR_MSG(extack,
1412                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1413                 return -EINVAL;
1414         }
1415
1416         if (data[IFLA_GENEVE_REMOTE]) {
1417                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1418                         attrtype = IFLA_GENEVE_REMOTE;
1419                         goto change_notsup;
1420                 }
1421
1422                 info->key.u.ipv4.dst =
1423                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1424
1425                 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1426                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1427                                             "Remote IPv4 address cannot be Multicast");
1428                         return -EINVAL;
1429                 }
1430         }
1431
1432         if (data[IFLA_GENEVE_REMOTE6]) {
1433 #if IS_ENABLED(CONFIG_IPV6)
1434                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1435                         attrtype = IFLA_GENEVE_REMOTE6;
1436                         goto change_notsup;
1437                 }
1438
1439                 info->mode = IP_TUNNEL_INFO_IPV6;
1440                 info->key.u.ipv6.dst =
1441                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1442
1443                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1444                     IPV6_ADDR_LINKLOCAL) {
1445                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1446                                             "Remote IPv6 address cannot be link-local");
1447                         return -EINVAL;
1448                 }
1449                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1450                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1451                                             "Remote IPv6 address cannot be Multicast");
1452                         return -EINVAL;
1453                 }
1454                 info->key.tun_flags |= TUNNEL_CSUM;
1455                 cfg->use_udp6_rx_checksums = true;
1456 #else
1457                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1458                                     "IPv6 support not enabled in the kernel");
1459                 return -EPFNOSUPPORT;
1460 #endif
1461         }
1462
1463         if (data[IFLA_GENEVE_ID]) {
1464                 __u32 vni;
1465                 __u8 tvni[3];
1466                 __be64 tunid;
1467
1468                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1469                 tvni[0] = (vni & 0x00ff0000) >> 16;
1470                 tvni[1] = (vni & 0x0000ff00) >> 8;
1471                 tvni[2] =  vni & 0x000000ff;
1472
1473                 tunid = vni_to_tunnel_id(tvni);
1474                 if (changelink && (tunid != info->key.tun_id)) {
1475                         attrtype = IFLA_GENEVE_ID;
1476                         goto change_notsup;
1477                 }
1478                 info->key.tun_id = tunid;
1479         }
1480
1481         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1482                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1483                         cfg->ttl_inherit = true;
1484                 else
1485                         cfg->ttl_inherit = false;
1486         } else if (data[IFLA_GENEVE_TTL]) {
1487                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1488                 cfg->ttl_inherit = false;
1489         }
1490
1491         if (data[IFLA_GENEVE_TOS])
1492                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1493
1494         if (data[IFLA_GENEVE_DF])
1495                 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1496
1497         if (data[IFLA_GENEVE_LABEL]) {
1498                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1499                                   IPV6_FLOWLABEL_MASK;
1500                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1501                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1502                                             "Label attribute only applies for IPv6 Geneve devices");
1503                         return -EINVAL;
1504                 }
1505         }
1506
1507         if (data[IFLA_GENEVE_PORT]) {
1508                 if (changelink) {
1509                         attrtype = IFLA_GENEVE_PORT;
1510                         goto change_notsup;
1511                 }
1512                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1513         }
1514
1515         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1516                 if (changelink) {
1517                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1518                         goto change_notsup;
1519                 }
1520                 cfg->collect_md = true;
1521         }
1522
1523         if (data[IFLA_GENEVE_UDP_CSUM]) {
1524                 if (changelink) {
1525                         attrtype = IFLA_GENEVE_UDP_CSUM;
1526                         goto change_notsup;
1527                 }
1528                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1529                         info->key.tun_flags |= TUNNEL_CSUM;
1530         }
1531
1532         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1533 #if IS_ENABLED(CONFIG_IPV6)
1534                 if (changelink) {
1535                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1536                         goto change_notsup;
1537                 }
1538                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1539                         info->key.tun_flags &= ~TUNNEL_CSUM;
1540 #else
1541                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1542                                     "IPv6 support not enabled in the kernel");
1543                 return -EPFNOSUPPORT;
1544 #endif
1545         }
1546
1547         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1548 #if IS_ENABLED(CONFIG_IPV6)
1549                 if (changelink) {
1550                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1551                         goto change_notsup;
1552                 }
1553                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1554                         cfg->use_udp6_rx_checksums = false;
1555 #else
1556                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1557                                     "IPv6 support not enabled in the kernel");
1558                 return -EPFNOSUPPORT;
1559 #endif
1560         }
1561
1562         return 0;
1563 change_notsup:
1564         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1565                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1566         return -EOPNOTSUPP;
1567 }
1568
1569 static void geneve_link_config(struct net_device *dev,
1570                                struct ip_tunnel_info *info, struct nlattr *tb[])
1571 {
1572         struct geneve_dev *geneve = netdev_priv(dev);
1573         int ldev_mtu = 0;
1574
1575         if (tb[IFLA_MTU]) {
1576                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1577                 return;
1578         }
1579
1580         switch (ip_tunnel_info_af(info)) {
1581         case AF_INET: {
1582                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1583                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1584
1585                 if (!IS_ERR(rt) && rt->dst.dev) {
1586                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1587                         ip_rt_put(rt);
1588                 }
1589                 break;
1590         }
1591 #if IS_ENABLED(CONFIG_IPV6)
1592         case AF_INET6: {
1593                 struct rt6_info *rt;
1594
1595                 if (!__in6_dev_get(dev))
1596                         break;
1597
1598                 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1599                                 NULL, 0);
1600
1601                 if (rt && rt->dst.dev)
1602                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1603                 ip6_rt_put(rt);
1604                 break;
1605         }
1606 #endif
1607         }
1608
1609         if (ldev_mtu <= 0)
1610                 return;
1611
1612         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1613 }
1614
1615 static int geneve_newlink(struct net *net, struct net_device *dev,
1616                           struct nlattr *tb[], struct nlattr *data[],
1617                           struct netlink_ext_ack *extack)
1618 {
1619         struct geneve_config cfg = {
1620                 .df = GENEVE_DF_UNSET,
1621                 .use_udp6_rx_checksums = false,
1622                 .ttl_inherit = false,
1623                 .collect_md = false,
1624         };
1625         int err;
1626
1627         init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1628         err = geneve_nl2info(tb, data, extack, &cfg, false);
1629         if (err)
1630                 return err;
1631
1632         err = geneve_configure(net, dev, extack, &cfg);
1633         if (err)
1634                 return err;
1635
1636         geneve_link_config(dev, &cfg.info, tb);
1637
1638         return 0;
1639 }
1640
1641 /* Quiesces the geneve device data path for both TX and RX.
1642  *
1643  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1644  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1645  * to complete for the existing set of in-flight packets to be transmitted,
1646  * then we would have quiesced the transmit data path. All the future packets
1647  * will get dropped until we unquiesce the data path.
1648  *
1649  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1650  * if we set that to NULL under RCU and wait for synchronize_net() to
1651  * complete, then we would have quiesced the receive data path.
1652  */
1653 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1654                            struct geneve_sock **gs6)
1655 {
1656         *gs4 = rtnl_dereference(geneve->sock4);
1657         rcu_assign_pointer(geneve->sock4, NULL);
1658         if (*gs4)
1659                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1660 #if IS_ENABLED(CONFIG_IPV6)
1661         *gs6 = rtnl_dereference(geneve->sock6);
1662         rcu_assign_pointer(geneve->sock6, NULL);
1663         if (*gs6)
1664                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1665 #else
1666         *gs6 = NULL;
1667 #endif
1668         synchronize_net();
1669 }
1670
1671 /* Resumes the geneve device data path for both TX and RX. */
1672 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1673                              struct geneve_sock __maybe_unused *gs6)
1674 {
1675         rcu_assign_pointer(geneve->sock4, gs4);
1676         if (gs4)
1677                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1678 #if IS_ENABLED(CONFIG_IPV6)
1679         rcu_assign_pointer(geneve->sock6, gs6);
1680         if (gs6)
1681                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1682 #endif
1683         synchronize_net();
1684 }
1685
1686 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1687                              struct nlattr *data[],
1688                              struct netlink_ext_ack *extack)
1689 {
1690         struct geneve_dev *geneve = netdev_priv(dev);
1691         struct geneve_sock *gs4, *gs6;
1692         struct geneve_config cfg;
1693         int err;
1694
1695         /* If the geneve device is configured for metadata (or externally
1696          * controlled, for example, OVS), then nothing can be changed.
1697          */
1698         if (geneve->cfg.collect_md)
1699                 return -EOPNOTSUPP;
1700
1701         /* Start with the existing info. */
1702         memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1703         err = geneve_nl2info(tb, data, extack, &cfg, true);
1704         if (err)
1705                 return err;
1706
1707         if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1708                 dst_cache_reset(&cfg.info.dst_cache);
1709                 geneve_link_config(dev, &cfg.info, tb);
1710         }
1711
1712         geneve_quiesce(geneve, &gs4, &gs6);
1713         memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1714         geneve_unquiesce(geneve, gs4, gs6);
1715
1716         return 0;
1717 }
1718
1719 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1720 {
1721         struct geneve_dev *geneve = netdev_priv(dev);
1722
1723         list_del(&geneve->next);
1724         unregister_netdevice_queue(dev, head);
1725 }
1726
1727 static size_t geneve_get_size(const struct net_device *dev)
1728 {
1729         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1730                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1731                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1732                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1733                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_DF */
1734                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1735                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1736                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1737                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1738                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1739                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1740                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_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         return 0;
1801
1802 nla_put_failure:
1803         return -EMSGSIZE;
1804 }
1805
1806 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1807         .kind           = "geneve",
1808         .maxtype        = IFLA_GENEVE_MAX,
1809         .policy         = geneve_policy,
1810         .priv_size      = sizeof(struct geneve_dev),
1811         .setup          = geneve_setup,
1812         .validate       = geneve_validate,
1813         .newlink        = geneve_newlink,
1814         .changelink     = geneve_changelink,
1815         .dellink        = geneve_dellink,
1816         .get_size       = geneve_get_size,
1817         .fill_info      = geneve_fill_info,
1818 };
1819
1820 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1821                                         u8 name_assign_type, u16 dst_port)
1822 {
1823         struct nlattr *tb[IFLA_MAX + 1];
1824         struct net_device *dev;
1825         LIST_HEAD(list_kill);
1826         int err;
1827         struct geneve_config cfg = {
1828                 .df = GENEVE_DF_UNSET,
1829                 .use_udp6_rx_checksums = true,
1830                 .ttl_inherit = false,
1831                 .collect_md = true,
1832         };
1833
1834         memset(tb, 0, sizeof(tb));
1835         dev = rtnl_create_link(net, name, name_assign_type,
1836                                &geneve_link_ops, tb, NULL);
1837         if (IS_ERR(dev))
1838                 return dev;
1839
1840         init_tnl_info(&cfg.info, dst_port);
1841         err = geneve_configure(net, dev, NULL, &cfg);
1842         if (err) {
1843                 free_netdev(dev);
1844                 return ERR_PTR(err);
1845         }
1846
1847         /* openvswitch users expect packet sizes to be unrestricted,
1848          * so set the largest MTU we can.
1849          */
1850         err = geneve_change_mtu(dev, IP_MAX_MTU);
1851         if (err)
1852                 goto err;
1853
1854         err = rtnl_configure_link(dev, NULL);
1855         if (err < 0)
1856                 goto err;
1857
1858         return dev;
1859 err:
1860         geneve_dellink(dev, &list_kill);
1861         unregister_netdevice_many(&list_kill);
1862         return ERR_PTR(err);
1863 }
1864 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1865
1866 static int geneve_netdevice_event(struct notifier_block *unused,
1867                                   unsigned long event, void *ptr)
1868 {
1869         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1870
1871         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
1872                 geneve_offload_rx_ports(dev, true);
1873         else if (event == NETDEV_UDP_TUNNEL_DROP_INFO)
1874                 geneve_offload_rx_ports(dev, false);
1875
1876         return NOTIFY_DONE;
1877 }
1878
1879 static struct notifier_block geneve_notifier_block __read_mostly = {
1880         .notifier_call = geneve_netdevice_event,
1881 };
1882
1883 static __net_init int geneve_init_net(struct net *net)
1884 {
1885         struct geneve_net *gn = net_generic(net, geneve_net_id);
1886
1887         INIT_LIST_HEAD(&gn->geneve_list);
1888         INIT_LIST_HEAD(&gn->sock_list);
1889         return 0;
1890 }
1891
1892 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1893 {
1894         struct geneve_net *gn = net_generic(net, geneve_net_id);
1895         struct geneve_dev *geneve, *next;
1896         struct net_device *dev, *aux;
1897
1898         /* gather any geneve devices that were moved into this ns */
1899         for_each_netdev_safe(net, dev, aux)
1900                 if (dev->rtnl_link_ops == &geneve_link_ops)
1901                         unregister_netdevice_queue(dev, head);
1902
1903         /* now gather any other geneve devices that were created in this ns */
1904         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1905                 /* If geneve->dev is in the same netns, it was already added
1906                  * to the list by the previous loop.
1907                  */
1908                 if (!net_eq(dev_net(geneve->dev), net))
1909                         unregister_netdevice_queue(geneve->dev, head);
1910         }
1911 }
1912
1913 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1914 {
1915         struct net *net;
1916         LIST_HEAD(list);
1917
1918         rtnl_lock();
1919         list_for_each_entry(net, net_list, exit_list)
1920                 geneve_destroy_tunnels(net, &list);
1921
1922         /* unregister the devices gathered above */
1923         unregister_netdevice_many(&list);
1924         rtnl_unlock();
1925
1926         list_for_each_entry(net, net_list, exit_list) {
1927                 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1928
1929                 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1930         }
1931 }
1932
1933 static struct pernet_operations geneve_net_ops = {
1934         .init = geneve_init_net,
1935         .exit_batch = geneve_exit_batch_net,
1936         .id   = &geneve_net_id,
1937         .size = sizeof(struct geneve_net),
1938 };
1939
1940 static int __init geneve_init_module(void)
1941 {
1942         int rc;
1943
1944         rc = register_pernet_subsys(&geneve_net_ops);
1945         if (rc)
1946                 goto out1;
1947
1948         rc = register_netdevice_notifier(&geneve_notifier_block);
1949         if (rc)
1950                 goto out2;
1951
1952         rc = rtnl_link_register(&geneve_link_ops);
1953         if (rc)
1954                 goto out3;
1955
1956         return 0;
1957 out3:
1958         unregister_netdevice_notifier(&geneve_notifier_block);
1959 out2:
1960         unregister_pernet_subsys(&geneve_net_ops);
1961 out1:
1962         return rc;
1963 }
1964 late_initcall(geneve_init_module);
1965
1966 static void __exit geneve_cleanup_module(void)
1967 {
1968         rtnl_link_unregister(&geneve_link_ops);
1969         unregister_netdevice_notifier(&geneve_notifier_block);
1970         unregister_pernet_subsys(&geneve_net_ops);
1971 }
1972 module_exit(geneve_cleanup_module);
1973
1974 MODULE_LICENSE("GPL");
1975 MODULE_VERSION(GENEVE_NETDEV_VER);
1976 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1977 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1978 MODULE_ALIAS_RTNL_LINK("geneve");