drivers/net/geneve.c

   1 /*
   2  * GENEVE: Generic Network Virtualization Encapsulation
   3  *
   4  * Copyright (c) 2015 Red Hat, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/etherdevice.h>
  16 #include <linux/hash.h>
  17 #include <net/dst_metadata.h>
  18 #include <net/gro_cells.h>
  19 #include <net/rtnetlink.h>
  20 #include <net/geneve.h>
  21 #include <net/protocol.h>
  22
  23 #define GENEVE_NETDEV_VER       "0.6"
  24
  25 #define GENEVE_UDP_PORT         6081
  26
  27 #define GENEVE_N_VID            (1u << 24)
  28 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  29
  30 #define VNI_HASH_BITS           10
  31 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  32
  33 static bool log_ecn_error = true;
  34 module_param(log_ecn_error, bool, 0644);
  35 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  36
  37 #define GENEVE_VER 0
  38 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  39 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  40 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  41
  42 /* per-network namespace private data for this module */
  43 struct geneve_net {
  44         struct list_head        geneve_list;
  45         struct list_head        sock_list;
  46 };
  47
  48 static unsigned int geneve_net_id;
  49
  50 struct geneve_dev_node {
  51         struct hlist_node hlist;
  52         struct geneve_dev *geneve;
  53 };
  54
  55 /* Pseudo network device */
  56 struct geneve_dev {
  57         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  58 #if IS_ENABLED(CONFIG_IPV6)
  59         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  60 #endif
  61         struct net         *net;        /* netns for packet i/o */
  62         struct net_device  *dev;        /* netdev for geneve tunnel */
  63         struct ip_tunnel_info info;
  64         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  65 #if IS_ENABLED(CONFIG_IPV6)
  66         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  67 #endif
  68         struct list_head   next;        /* geneve's per namespace list */
  69         struct gro_cells   gro_cells;
  70         bool               collect_md;
  71         bool               use_udp6_rx_checksums;
  72         bool               ttl_inherit;
  73 };
  74
  75 struct geneve_sock {
  76         bool                    collect_md;
  77         struct list_head        list;
  78         struct socket           *sock;
  79         struct rcu_head         rcu;
  80         int                     refcnt;
  81         struct hlist_head       vni_list[VNI_HASH_SIZE];
  82 };
  83
  84 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  85 {
  86         __u32 vnid;
  87
  88         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  89         return hash_32(vnid, VNI_HASH_BITS);
  90 }
  91
  92 static __be64 vni_to_tunnel_id(const __u8 *vni)
  93 {
  94 #ifdef __BIG_ENDIAN
  95         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
  96 #else
  97         return (__force __be64)(((__force u64)vni[0] << 40) |
  98                                 ((__force u64)vni[1] << 48) |
  99                                 ((__force u64)vni[2] << 56));
 100 #endif
 101 }
 102
 103 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 104 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 105 {
 106 #ifdef __BIG_ENDIAN
 107         vni[0] = (__force __u8)(tun_id >> 16);
 108         vni[1] = (__force __u8)(tun_id >> 8);
 109         vni[2] = (__force __u8)tun_id;
 110 #else
 111         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 112         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 113         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 114 #endif
 115 }
 116
 117 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 118 {
 119         return !memcmp(vni, &tun_id[5], 3);
 120 }
 121
 122 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 123 {
 124         return gs->sock->sk->sk_family;
 125 }
 126
 127 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 128                                         __be32 addr, u8 vni[])
 129 {
 130         struct hlist_head *vni_list_head;
 131         struct geneve_dev_node *node;
 132         __u32 hash;
 133
 134         /* Find the device for this VNI */
 135         hash = geneve_net_vni_hash(vni);
 136         vni_list_head = &gs->vni_list[hash];
 137         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 138                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 139                     addr == node->geneve->info.key.u.ipv4.dst)
 140                         return node->geneve;
 141         }
 142         return NULL;
 143 }
 144
 145 #if IS_ENABLED(CONFIG_IPV6)
 146 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 147                                          struct in6_addr addr6, u8 vni[])
 148 {
 149         struct hlist_head *vni_list_head;
 150         struct geneve_dev_node *node;
 151         __u32 hash;
 152
 153         /* Find the device for this VNI */
 154         hash = geneve_net_vni_hash(vni);
 155         vni_list_head = &gs->vni_list[hash];
 156         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 157                 if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
 158                     ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
 159                         return node->geneve;
 160         }
 161         return NULL;
 162 }
 163 #endif
 164
 165 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 166 {
 167         return (struct genevehdr *)(udp_hdr(skb) + 1);
 168 }
 169
 170 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 171                                             struct sk_buff *skb)
 172 {
 173         static u8 zero_vni[3];
 174         u8 *vni;
 175
 176         if (geneve_get_sk_family(gs) == AF_INET) {
 177                 struct iphdr *iph;
 178                 __be32 addr;
 179
 180                 iph = ip_hdr(skb); /* outer IP header... */
 181
 182                 if (gs->collect_md) {
 183                         vni = zero_vni;
 184                         addr = 0;
 185                 } else {
 186                         vni = geneve_hdr(skb)->vni;
 187                         addr = iph->saddr;
 188                 }
 189
 190                 return geneve_lookup(gs, addr, vni);
 191 #if IS_ENABLED(CONFIG_IPV6)
 192         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 193                 static struct in6_addr zero_addr6;
 194                 struct ipv6hdr *ip6h;
 195                 struct in6_addr addr6;
 196
 197                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 198
 199                 if (gs->collect_md) {
 200                         vni = zero_vni;
 201                         addr6 = zero_addr6;
 202                 } else {
 203                         vni = geneve_hdr(skb)->vni;
 204                         addr6 = ip6h->saddr;
 205                 }
 206
 207                 return geneve6_lookup(gs, addr6, vni);
 208 #endif
 209         }
 210         return NULL;
 211 }
 212
 213 /* geneve receive/decap routine */
 214 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 215                       struct sk_buff *skb)
 216 {
 217         struct genevehdr *gnvh = geneve_hdr(skb);
 218         struct metadata_dst *tun_dst = NULL;
 219         struct pcpu_sw_netstats *stats;
 220         unsigned int len;
 221         int err = 0;
 222         void *oiph;
 223
 224         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 225                 __be16 flags;
 226
 227                 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
 228                         (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                 stats = this_cpu_ptr(geneve->dev->tstats);
 300                 u64_stats_update_begin(&stats->syncp);
 301                 stats->rx_packets++;
 302                 stats->rx_bytes += len;
 303                 u64_stats_update_end(&stats->syncp);
 304         }
 305         return;
 306 drop:
 307         /* Consume bad packet */
 308         kfree_skb(skb);
 309 }
 310
 311 /* Setup stats when device is created */
 312 static int geneve_init(struct net_device *dev)
 313 {
 314         struct geneve_dev *geneve = netdev_priv(dev);
 315         int err;
 316
 317         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 318         if (!dev->tstats)
 319                 return -ENOMEM;
 320
 321         err = gro_cells_init(&geneve->gro_cells, dev);
 322         if (err) {
 323                 free_percpu(dev->tstats);
 324                 return err;
 325         }
 326
 327         err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
 328         if (err) {
 329                 free_percpu(dev->tstats);
 330                 gro_cells_destroy(&geneve->gro_cells);
 331                 return err;
 332         }
 333         return 0;
 334 }
 335
 336 static void geneve_uninit(struct net_device *dev)
 337 {
 338         struct geneve_dev *geneve = netdev_priv(dev);
 339
 340         dst_cache_destroy(&geneve->info.dst_cache);
 341         gro_cells_destroy(&geneve->gro_cells);
 342         free_percpu(dev->tstats);
 343 }
 344
 345 /* Callback from net/ipv4/udp.c to receive packets */
 346 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 347 {
 348         struct genevehdr *geneveh;
 349         struct geneve_dev *geneve;
 350         struct geneve_sock *gs;
 351         int opts_len;
 352
 353         /* Need UDP and Geneve header to be present */
 354         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 355                 goto drop;
 356
 357         /* Return packets with reserved bits set */
 358         geneveh = geneve_hdr(skb);
 359         if (unlikely(geneveh->ver != GENEVE_VER))
 360                 goto drop;
 361
 362         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 363                 goto drop;
 364
 365         gs = rcu_dereference_sk_user_data(sk);
 366         if (!gs)
 367                 goto drop;
 368
 369         geneve = geneve_lookup_skb(gs, skb);
 370         if (!geneve)
 371                 goto drop;
 372
 373         opts_len = geneveh->opt_len * 4;
 374         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 375                                  htons(ETH_P_TEB),
 376                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 377                 geneve->dev->stats.rx_dropped++;
 378                 goto drop;
 379         }
 380
 381         geneve_rx(geneve, gs, skb);
 382         return 0;
 383
 384 drop:
 385         /* Consume bad packet */
 386         kfree_skb(skb);
 387         return 0;
 388 }
 389
 390 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 391                                          __be16 port, bool ipv6_rx_csum)
 392 {
 393         struct socket *sock;
 394         struct udp_port_cfg udp_conf;
 395         int err;
 396
 397         memset(&udp_conf, 0, sizeof(udp_conf));
 398
 399         if (ipv6) {
 400                 udp_conf.family = AF_INET6;
 401                 udp_conf.ipv6_v6only = 1;
 402                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 403         } else {
 404                 udp_conf.family = AF_INET;
 405                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 406         }
 407
 408         udp_conf.local_udp_port = port;
 409
 410         /* Open UDP socket */
 411         err = udp_sock_create(net, &udp_conf, &sock);
 412         if (err < 0)
 413                 return ERR_PTR(err);
 414
 415         return sock;
 416 }
 417
 418 static int geneve_hlen(struct genevehdr *gh)
 419 {
 420         return sizeof(*gh) + gh->opt_len * 4;
 421 }
 422
 423 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 424                                           struct list_head *head,
 425                                           struct sk_buff *skb)
 426 {
 427         struct sk_buff *pp = NULL;
 428         struct sk_buff *p;
 429         struct genevehdr *gh, *gh2;
 430         unsigned int hlen, gh_len, off_gnv;
 431         const struct packet_offload *ptype;
 432         __be16 type;
 433         int flush = 1;
 434
 435         off_gnv = skb_gro_offset(skb);
 436         hlen = off_gnv + sizeof(*gh);
 437         gh = skb_gro_header_fast(skb, off_gnv);
 438         if (skb_gro_header_hard(skb, hlen)) {
 439                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 440                 if (unlikely(!gh))
 441                         goto out;
 442         }
 443
 444         if (gh->ver != GENEVE_VER || gh->oam)
 445                 goto out;
 446         gh_len = geneve_hlen(gh);
 447
 448         hlen = off_gnv + gh_len;
 449         if (skb_gro_header_hard(skb, hlen)) {
 450                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 451                 if (unlikely(!gh))
 452                         goto out;
 453         }
 454
 455         list_for_each_entry(p, head, list) {
 456                 if (!NAPI_GRO_CB(p)->same_flow)
 457                         continue;
 458
 459                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 460                 if (gh->opt_len != gh2->opt_len ||
 461                     memcmp(gh, gh2, gh_len)) {
 462                         NAPI_GRO_CB(p)->same_flow = 0;
 463                         continue;
 464                 }
 465         }
 466
 467         type = gh->proto_type;
 468
 469         rcu_read_lock();
 470         ptype = gro_find_receive_by_type(type);
 471         if (!ptype)
 472                 goto out_unlock;
 473
 474         skb_gro_pull(skb, gh_len);
 475         skb_gro_postpull_rcsum(skb, gh, gh_len);
 476         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 477         flush = 0;
 478
 479 out_unlock:
 480         rcu_read_unlock();
 481 out:
 482         skb_gro_flush_final(skb, pp, flush);
 483
 484         return pp;
 485 }
 486
 487 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 488                                int nhoff)
 489 {
 490         struct genevehdr *gh;
 491         struct packet_offload *ptype;
 492         __be16 type;
 493         int gh_len;
 494         int err = -ENOSYS;
 495
 496         gh = (struct genevehdr *)(skb->data + nhoff);
 497         gh_len = geneve_hlen(gh);
 498         type = gh->proto_type;
 499
 500         rcu_read_lock();
 501         ptype = gro_find_complete_by_type(type);
 502         if (ptype)
 503                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 504
 505         rcu_read_unlock();
 506
 507         skb_set_inner_mac_header(skb, nhoff + gh_len);
 508
 509         return err;
 510 }
 511
 512 /* Create new listen socket if needed */
 513 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 514                                                 bool ipv6, bool ipv6_rx_csum)
 515 {
 516         struct geneve_net *gn = net_generic(net, geneve_net_id);
 517         struct geneve_sock *gs;
 518         struct socket *sock;
 519         struct udp_tunnel_sock_cfg tunnel_cfg;
 520         int h;
 521
 522         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 523         if (!gs)
 524                 return ERR_PTR(-ENOMEM);
 525
 526         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 527         if (IS_ERR(sock)) {
 528                 kfree(gs);
 529                 return ERR_CAST(sock);
 530         }
 531
 532         gs->sock = sock;
 533         gs->refcnt = 1;
 534         for (h = 0; h < VNI_HASH_SIZE; ++h)
 535                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 536
 537         /* Initialize the geneve udp offloads structure */
 538         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 539
 540         /* Mark socket as an encapsulation socket */
 541         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 542         tunnel_cfg.sk_user_data = gs;
 543         tunnel_cfg.encap_type = 1;
 544         tunnel_cfg.gro_receive = geneve_gro_receive;
 545         tunnel_cfg.gro_complete = geneve_gro_complete;
 546         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 547         tunnel_cfg.encap_destroy = NULL;
 548         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 549         list_add(&gs->list, &gn->sock_list);
 550         return gs;
 551 }
 552
 553 static void __geneve_sock_release(struct geneve_sock *gs)
 554 {
 555         if (!gs || --gs->refcnt)
 556                 return;
 557
 558         list_del(&gs->list);
 559         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 560         udp_tunnel_sock_release(gs->sock);
 561         kfree_rcu(gs, rcu);
 562 }
 563
 564 static void geneve_sock_release(struct geneve_dev *geneve)
 565 {
 566         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 567 #if IS_ENABLED(CONFIG_IPV6)
 568         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 569
 570         rcu_assign_pointer(geneve->sock6, NULL);
 571 #endif
 572
 573         rcu_assign_pointer(geneve->sock4, NULL);
 574         synchronize_net();
 575
 576         __geneve_sock_release(gs4);
 577 #if IS_ENABLED(CONFIG_IPV6)
 578         __geneve_sock_release(gs6);
 579 #endif
 580 }
 581
 582 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 583                                             sa_family_t family,
 584                                             __be16 dst_port)
 585 {
 586         struct geneve_sock *gs;
 587
 588         list_for_each_entry(gs, &gn->sock_list, list) {
 589                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 590                     geneve_get_sk_family(gs) == family) {
 591                         return gs;
 592                 }
 593         }
 594         return NULL;
 595 }
 596
 597 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 598 {
 599         struct net *net = geneve->net;
 600         struct geneve_net *gn = net_generic(net, geneve_net_id);
 601         struct geneve_dev_node *node;
 602         struct geneve_sock *gs;
 603         __u8 vni[3];
 604         __u32 hash;
 605
 606         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
 607         if (gs) {
 608                 gs->refcnt++;
 609                 goto out;
 610         }
 611
 612         gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
 613                                   geneve->use_udp6_rx_checksums);
 614         if (IS_ERR(gs))
 615                 return PTR_ERR(gs);
 616
 617 out:
 618         gs->collect_md = geneve->collect_md;
 619 #if IS_ENABLED(CONFIG_IPV6)
 620         if (ipv6) {
 621                 rcu_assign_pointer(geneve->sock6, gs);
 622                 node = &geneve->hlist6;
 623         } else
 624 #endif
 625         {
 626                 rcu_assign_pointer(geneve->sock4, gs);
 627                 node = &geneve->hlist4;
 628         }
 629         node->geneve = geneve;
 630
 631         tunnel_id_to_vni(geneve->info.key.tun_id, vni);
 632         hash = geneve_net_vni_hash(vni);
 633         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 634         return 0;
 635 }
 636
 637 static int geneve_open(struct net_device *dev)
 638 {
 639         struct geneve_dev *geneve = netdev_priv(dev);
 640         bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6);
 641         bool metadata = geneve->collect_md;
 642         int ret = 0;
 643
 644 #if IS_ENABLED(CONFIG_IPV6)
 645         if (ipv6 || metadata)
 646                 ret = geneve_sock_add(geneve, true);
 647 #endif
 648         if (!ret && (!ipv6 || metadata))
 649                 ret = geneve_sock_add(geneve, false);
 650         if (ret < 0)
 651                 geneve_sock_release(geneve);
 652
 653         return ret;
 654 }
 655
 656 static int geneve_stop(struct net_device *dev)
 657 {
 658         struct geneve_dev *geneve = netdev_priv(dev);
 659
 660         hlist_del_init_rcu(&geneve->hlist4.hlist);
 661 #if IS_ENABLED(CONFIG_IPV6)
 662         hlist_del_init_rcu(&geneve->hlist6.hlist);
 663 #endif
 664         geneve_sock_release(geneve);
 665         return 0;
 666 }
 667
 668 static void geneve_build_header(struct genevehdr *geneveh,
 669                                 const struct ip_tunnel_info *info)
 670 {
 671         geneveh->ver = GENEVE_VER;
 672         geneveh->opt_len = info->options_len / 4;
 673         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 674         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 675         geneveh->rsvd1 = 0;
 676         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 677         geneveh->proto_type = htons(ETH_P_TEB);
 678         geneveh->rsvd2 = 0;
 679
 680         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 681                 ip_tunnel_info_opts_get(geneveh->options, info);
 682 }
 683
 684 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 685                             const struct ip_tunnel_info *info,
 686                             bool xnet, int ip_hdr_len)
 687 {
 688         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 689         struct genevehdr *gnvh;
 690         int min_headroom;
 691         int err;
 692
 693         skb_reset_mac_header(skb);
 694         skb_scrub_packet(skb, xnet);
 695
 696         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 697                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 698         err = skb_cow_head(skb, min_headroom);
 699         if (unlikely(err))
 700                 goto free_dst;
 701
 702         err = udp_tunnel_handle_offloads(skb, udp_sum);
 703         if (err)
 704                 goto free_dst;
 705
 706         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 707         geneve_build_header(gnvh, info);
 708         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 709         return 0;
 710
 711 free_dst:
 712         dst_release(dst);
 713         return err;
 714 }
 715
 716 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 717                                        struct net_device *dev,
 718                                        struct geneve_sock *gs4,
 719                                        struct flowi4 *fl4,
 720                                        const struct ip_tunnel_info *info)
 721 {
 722         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 723         struct geneve_dev *geneve = netdev_priv(dev);
 724         struct dst_cache *dst_cache;
 725         struct rtable *rt = NULL;
 726         __u8 tos;
 727
 728         if (!gs4)
 729                 return ERR_PTR(-EIO);
 730
 731         memset(fl4, 0, sizeof(*fl4));
 732         fl4->flowi4_mark = skb->mark;
 733         fl4->flowi4_proto = IPPROTO_UDP;
 734         fl4->daddr = info->key.u.ipv4.dst;
 735         fl4->saddr = info->key.u.ipv4.src;
 736
 737         tos = info->key.tos;
 738         if ((tos == 1) && !geneve->collect_md) {
 739                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 740                 use_cache = false;
 741         }
 742         fl4->flowi4_tos = RT_TOS(tos);
 743
 744         dst_cache = (struct dst_cache *)&info->dst_cache;
 745         if (use_cache) {
 746                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 747                 if (rt)
 748                         return rt;
 749         }
 750         rt = ip_route_output_key(geneve->net, fl4);
 751         if (IS_ERR(rt)) {
 752                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 753                 return ERR_PTR(-ENETUNREACH);
 754         }
 755         if (rt->dst.dev == dev) { /* is this necessary? */
 756                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 757                 ip_rt_put(rt);
 758                 return ERR_PTR(-ELOOP);
 759         }
 760         if (use_cache)
 761                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 762         return rt;
 763 }
 764
 765 #if IS_ENABLED(CONFIG_IPV6)
 766 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 767                                            struct net_device *dev,
 768                                            struct geneve_sock *gs6,
 769                                            struct flowi6 *fl6,
 770                                            const struct ip_tunnel_info *info)
 771 {
 772         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 773         struct geneve_dev *geneve = netdev_priv(dev);
 774         struct dst_entry *dst = NULL;
 775         struct dst_cache *dst_cache;
 776         __u8 prio;
 777
 778         if (!gs6)
 779                 return ERR_PTR(-EIO);
 780
 781         memset(fl6, 0, sizeof(*fl6));
 782         fl6->flowi6_mark = skb->mark;
 783         fl6->flowi6_proto = IPPROTO_UDP;
 784         fl6->daddr = info->key.u.ipv6.dst;
 785         fl6->saddr = info->key.u.ipv6.src;
 786         prio = info->key.tos;
 787         if ((prio == 1) && !geneve->collect_md) {
 788                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 789                 use_cache = false;
 790         }
 791
 792         fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
 793                                            info->key.label);
 794         dst_cache = (struct dst_cache *)&info->dst_cache;
 795         if (use_cache) {
 796                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 797                 if (dst)
 798                         return dst;
 799         }
 800         if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
 801                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 802                 return ERR_PTR(-ENETUNREACH);
 803         }
 804         if (dst->dev == dev) { /* is this necessary? */
 805                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 806                 dst_release(dst);
 807                 return ERR_PTR(-ELOOP);
 808         }
 809
 810         if (use_cache)
 811                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 812         return dst;
 813 }
 814 #endif
 815
 816 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 817                            struct geneve_dev *geneve,
 818                            const struct ip_tunnel_info *info)
 819 {
 820         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 821         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 822         const struct ip_tunnel_key *key = &info->key;
 823         struct rtable *rt;
 824         struct flowi4 fl4;
 825         __u8 tos, ttl;
 826         __be16 sport;
 827         __be16 df;
 828         int err;
 829
 830         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
 831         if (IS_ERR(rt))
 832                 return PTR_ERR(rt);
 833
 834         skb_tunnel_check_pmtu(skb, &rt->dst,
 835                               GENEVE_IPV4_HLEN + info->options_len);
 836
 837         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 838         if (geneve->collect_md) {
 839                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 840                 ttl = key->ttl;
 841         } else {
 842                 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 843                 if (geneve->ttl_inherit)
 844                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 845                 else
 846                         ttl = key->ttl;
 847                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 848         }
 849         df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 850
 851         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 852         if (unlikely(err))
 853                 return err;
 854
 855         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 856                             tos, ttl, df, sport, geneve->info.key.tp_dst,
 857                             !net_eq(geneve->net, dev_net(geneve->dev)),
 858                             !(info->key.tun_flags & TUNNEL_CSUM));
 859         return 0;
 860 }
 861
 862 #if IS_ENABLED(CONFIG_IPV6)
 863 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 864                             struct geneve_dev *geneve,
 865                             const struct ip_tunnel_info *info)
 866 {
 867         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 868         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 869         const struct ip_tunnel_key *key = &info->key;
 870         struct dst_entry *dst = NULL;
 871         struct flowi6 fl6;
 872         __u8 prio, ttl;
 873         __be16 sport;
 874         int err;
 875
 876         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
 877         if (IS_ERR(dst))
 878                 return PTR_ERR(dst);
 879
 880         skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len);
 881
 882         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 883         if (geneve->collect_md) {
 884                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 885                 ttl = key->ttl;
 886         } else {
 887                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
 888                                            ip_hdr(skb), skb);
 889                 if (geneve->ttl_inherit)
 890                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 891                 else
 892                         ttl = key->ttl;
 893                 ttl = ttl ? : ip6_dst_hoplimit(dst);
 894         }
 895         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
 896         if (unlikely(err))
 897                 return err;
 898
 899         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
 900                              &fl6.saddr, &fl6.daddr, prio, ttl,
 901                              info->key.label, sport, geneve->info.key.tp_dst,
 902                              !(info->key.tun_flags & TUNNEL_CSUM));
 903         return 0;
 904 }
 905 #endif
 906
 907 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
 908 {
 909         struct geneve_dev *geneve = netdev_priv(dev);
 910         struct ip_tunnel_info *info = NULL;
 911         int err;
 912
 913         if (geneve->collect_md) {
 914                 info = skb_tunnel_info(skb);
 915                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
 916                         err = -EINVAL;
 917                         netdev_dbg(dev, "no tunnel metadata\n");
 918                         goto tx_error;
 919                 }
 920         } else {
 921                 info = &geneve->info;
 922         }
 923
 924         rcu_read_lock();
 925 #if IS_ENABLED(CONFIG_IPV6)
 926         if (info->mode & IP_TUNNEL_INFO_IPV6)
 927                 err = geneve6_xmit_skb(skb, dev, geneve, info);
 928         else
 929 #endif
 930                 err = geneve_xmit_skb(skb, dev, geneve, info);
 931         rcu_read_unlock();
 932
 933         if (likely(!err))
 934                 return NETDEV_TX_OK;
 935 tx_error:
 936         dev_kfree_skb(skb);
 937
 938         if (err == -ELOOP)
 939                 dev->stats.collisions++;
 940         else if (err == -ENETUNREACH)
 941                 dev->stats.tx_carrier_errors++;
 942
 943         dev->stats.tx_errors++;
 944         return NETDEV_TX_OK;
 945 }
 946
 947 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
 948 {
 949         if (new_mtu > dev->max_mtu)
 950                 new_mtu = dev->max_mtu;
 951         else if (new_mtu < dev->min_mtu)
 952                 new_mtu = dev->min_mtu;
 953
 954         dev->mtu = new_mtu;
 955         return 0;
 956 }
 957
 958 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
 959 {
 960         struct ip_tunnel_info *info = skb_tunnel_info(skb);
 961         struct geneve_dev *geneve = netdev_priv(dev);
 962
 963         if (ip_tunnel_info_af(info) == AF_INET) {
 964                 struct rtable *rt;
 965                 struct flowi4 fl4;
 966                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 967
 968                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
 969                 if (IS_ERR(rt))
 970                         return PTR_ERR(rt);
 971
 972                 ip_rt_put(rt);
 973                 info->key.u.ipv4.src = fl4.saddr;
 974 #if IS_ENABLED(CONFIG_IPV6)
 975         } else if (ip_tunnel_info_af(info) == AF_INET6) {
 976                 struct dst_entry *dst;
 977                 struct flowi6 fl6;
 978                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
 979
 980                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
 981                 if (IS_ERR(dst))
 982                         return PTR_ERR(dst);
 983
 984                 dst_release(dst);
 985                 info->key.u.ipv6.src = fl6.saddr;
 986 #endif
 987         } else {
 988                 return -EINVAL;
 989         }
 990
 991         info->key.tp_src = udp_flow_src_port(geneve->net, skb,
 992                                              1, USHRT_MAX, true);
 993         info->key.tp_dst = geneve->info.key.tp_dst;
 994         return 0;
 995 }
 996
 997 static const struct net_device_ops geneve_netdev_ops = {
 998         .ndo_init               = geneve_init,
 999         .ndo_uninit             = geneve_uninit,
1000         .ndo_open               = geneve_open,
1001         .ndo_stop               = geneve_stop,
1002         .ndo_start_xmit         = geneve_xmit,
1003         .ndo_get_stats64        = ip_tunnel_get_stats64,
1004         .ndo_change_mtu         = geneve_change_mtu,
1005         .ndo_validate_addr      = eth_validate_addr,
1006         .ndo_set_mac_address    = eth_mac_addr,
1007         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1008 };
1009
1010 static void geneve_get_drvinfo(struct net_device *dev,
1011                                struct ethtool_drvinfo *drvinfo)
1012 {
1013         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1014         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1015 }
1016
1017 static const struct ethtool_ops geneve_ethtool_ops = {
1018         .get_drvinfo    = geneve_get_drvinfo,
1019         .get_link       = ethtool_op_get_link,
1020 };
1021
1022 /* Info for udev, that this is a virtual tunnel endpoint */
1023 static struct device_type geneve_type = {
1024         .name = "geneve",
1025 };
1026
1027 /* Calls the ndo_udp_tunnel_add of the caller in order to
1028  * supply the listening GENEVE udp ports. Callers are expected
1029  * to implement the ndo_udp_tunnel_add.
1030  */
1031 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1032 {
1033         struct net *net = dev_net(dev);
1034         struct geneve_net *gn = net_generic(net, geneve_net_id);
1035         struct geneve_sock *gs;
1036
1037         rcu_read_lock();
1038         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1039                 if (push) {
1040                         udp_tunnel_push_rx_port(dev, gs->sock,
1041                                                 UDP_TUNNEL_TYPE_GENEVE);
1042                 } else {
1043                         udp_tunnel_drop_rx_port(dev, gs->sock,
1044                                                 UDP_TUNNEL_TYPE_GENEVE);
1045                 }
1046         }
1047         rcu_read_unlock();
1048 }
1049
1050 /* Initialize the device structure. */
1051 static void geneve_setup(struct net_device *dev)
1052 {
1053         ether_setup(dev);
1054
1055         dev->netdev_ops = &geneve_netdev_ops;
1056         dev->ethtool_ops = &geneve_ethtool_ops;
1057         dev->needs_free_netdev = true;
1058
1059         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1060
1061         dev->features    |= NETIF_F_LLTX;
1062         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1063         dev->features    |= NETIF_F_RXCSUM;
1064         dev->features    |= NETIF_F_GSO_SOFTWARE;
1065
1066         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1067         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1068
1069         /* MTU range: 68 - (something less than 65535) */
1070         dev->min_mtu = ETH_MIN_MTU;
1071         /* The max_mtu calculation does not take account of GENEVE
1072          * options, to avoid excluding potentially valid
1073          * configurations. This will be further reduced by IPvX hdr size.
1074          */
1075         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1076
1077         netif_keep_dst(dev);
1078         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1079         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1080         eth_hw_addr_random(dev);
1081 }
1082
1083 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1084         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1085         [IFLA_GENEVE_REMOTE]            = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
1086         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1087         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1088         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1089         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1090         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1091         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1092         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1093         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1094         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1095         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1096 };
1097
1098 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1099                            struct netlink_ext_ack *extack)
1100 {
1101         if (tb[IFLA_ADDRESS]) {
1102                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1103                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1104                                             "Provided link layer address is not Ethernet");
1105                         return -EINVAL;
1106                 }
1107
1108                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1109                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1110                                             "Provided Ethernet address is not unicast");
1111                         return -EADDRNOTAVAIL;
1112                 }
1113         }
1114
1115         if (!data) {
1116                 NL_SET_ERR_MSG(extack,
1117                                "Not enough attributes provided to perform the operation");
1118                 return -EINVAL;
1119         }
1120
1121         if (data[IFLA_GENEVE_ID]) {
1122                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1123
1124                 if (vni >= GENEVE_N_VID) {
1125                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1126                                             "Geneve ID must be lower than 16777216");
1127                         return -ERANGE;
1128                 }
1129         }
1130
1131         return 0;
1132 }
1133
1134 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1135                                           const struct ip_tunnel_info *info,
1136                                           bool *tun_on_same_port,
1137                                           bool *tun_collect_md)
1138 {
1139         struct geneve_dev *geneve, *t = NULL;
1140
1141         *tun_on_same_port = false;
1142         *tun_collect_md = false;
1143         list_for_each_entry(geneve, &gn->geneve_list, next) {
1144                 if (info->key.tp_dst == geneve->info.key.tp_dst) {
1145                         *tun_collect_md = geneve->collect_md;
1146                         *tun_on_same_port = true;
1147                 }
1148                 if (info->key.tun_id == geneve->info.key.tun_id &&
1149                     info->key.tp_dst == geneve->info.key.tp_dst &&
1150                     !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
1151                         t = geneve;
1152         }
1153         return t;
1154 }
1155
1156 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1157 {
1158         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1159                  info->key.ttl || info->key.label || info->key.tp_src ||
1160                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1161 }
1162
1163 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1164                                   struct ip_tunnel_info *b)
1165 {
1166         if (ip_tunnel_info_af(a) == AF_INET)
1167                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1168         else
1169                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1170 }
1171
1172 static int geneve_configure(struct net *net, struct net_device *dev,
1173                             struct netlink_ext_ack *extack,
1174                             const struct ip_tunnel_info *info,
1175                             bool metadata, bool ipv6_rx_csum,
1176                             bool ttl_inherit)
1177 {
1178         struct geneve_net *gn = net_generic(net, geneve_net_id);
1179         struct geneve_dev *t, *geneve = netdev_priv(dev);
1180         bool tun_collect_md, tun_on_same_port;
1181         int err, encap_len;
1182
1183         if (metadata && !is_tnl_info_zero(info)) {
1184                 NL_SET_ERR_MSG(extack,
1185                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1186                 return -EINVAL;
1187         }
1188
1189         geneve->net = net;
1190         geneve->dev = dev;
1191
1192         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1193         if (t)
1194                 return -EBUSY;
1195
1196         /* make enough headroom for basic scenario */
1197         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1198         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1199                 encap_len += sizeof(struct iphdr);
1200                 dev->max_mtu -= sizeof(struct iphdr);
1201         } else {
1202                 encap_len += sizeof(struct ipv6hdr);
1203                 dev->max_mtu -= sizeof(struct ipv6hdr);
1204         }
1205         dev->needed_headroom = encap_len + ETH_HLEN;
1206
1207         if (metadata) {
1208                 if (tun_on_same_port) {
1209                         NL_SET_ERR_MSG(extack,
1210                                        "There can be only one externally controlled device on a destination port");
1211                         return -EPERM;
1212                 }
1213         } else {
1214                 if (tun_collect_md) {
1215                         NL_SET_ERR_MSG(extack,
1216                                        "There already exists an externally controlled device on this destination port");
1217                         return -EPERM;
1218                 }
1219         }
1220
1221         dst_cache_reset(&geneve->info.dst_cache);
1222         geneve->info = *info;
1223         geneve->collect_md = metadata;
1224         geneve->use_udp6_rx_checksums = ipv6_rx_csum;
1225         geneve->ttl_inherit = ttl_inherit;
1226
1227         err = register_netdevice(dev);
1228         if (err)
1229                 return err;
1230
1231         list_add(&geneve->next, &gn->geneve_list);
1232         return 0;
1233 }
1234
1235 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1236 {
1237         memset(info, 0, sizeof(*info));
1238         info->key.tp_dst = htons(dst_port);
1239 }
1240
1241 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1242                           struct netlink_ext_ack *extack,
1243                           struct ip_tunnel_info *info, bool *metadata,
1244                           bool *use_udp6_rx_checksums, bool *ttl_inherit,
1245                           bool changelink)
1246 {
1247         int attrtype;
1248
1249         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1250                 NL_SET_ERR_MSG(extack,
1251                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1252                 return -EINVAL;
1253         }
1254
1255         if (data[IFLA_GENEVE_REMOTE]) {
1256                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1257                         attrtype = IFLA_GENEVE_REMOTE;
1258                         goto change_notsup;
1259                 }
1260
1261                 info->key.u.ipv4.dst =
1262                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1263
1264                 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
1265                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1266                                             "Remote IPv4 address cannot be Multicast");
1267                         return -EINVAL;
1268                 }
1269         }
1270
1271         if (data[IFLA_GENEVE_REMOTE6]) {
1272 #if IS_ENABLED(CONFIG_IPV6)
1273                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1274                         attrtype = IFLA_GENEVE_REMOTE6;
1275                         goto change_notsup;
1276                 }
1277
1278                 info->mode = IP_TUNNEL_INFO_IPV6;
1279                 info->key.u.ipv6.dst =
1280                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1281
1282                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1283                     IPV6_ADDR_LINKLOCAL) {
1284                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1285                                             "Remote IPv6 address cannot be link-local");
1286                         return -EINVAL;
1287                 }
1288                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1289                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1290                                             "Remote IPv6 address cannot be Multicast");
1291                         return -EINVAL;
1292                 }
1293                 info->key.tun_flags |= TUNNEL_CSUM;
1294                 *use_udp6_rx_checksums = true;
1295 #else
1296                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1297                                     "IPv6 support not enabled in the kernel");
1298                 return -EPFNOSUPPORT;
1299 #endif
1300         }
1301
1302         if (data[IFLA_GENEVE_ID]) {
1303                 __u32 vni;
1304                 __u8 tvni[3];
1305                 __be64 tunid;
1306
1307                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1308                 tvni[0] = (vni & 0x00ff0000) >> 16;
1309                 tvni[1] = (vni & 0x0000ff00) >> 8;
1310                 tvni[2] =  vni & 0x000000ff;
1311
1312                 tunid = vni_to_tunnel_id(tvni);
1313                 if (changelink && (tunid != info->key.tun_id)) {
1314                         attrtype = IFLA_GENEVE_ID;
1315                         goto change_notsup;
1316                 }
1317                 info->key.tun_id = tunid;
1318         }
1319
1320         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1321                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1322                         *ttl_inherit = true;
1323                 else
1324                         *ttl_inherit = false;
1325         } else if (data[IFLA_GENEVE_TTL]) {
1326                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1327                 *ttl_inherit = false;
1328         }
1329
1330         if (data[IFLA_GENEVE_TOS])
1331                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1332
1333         if (data[IFLA_GENEVE_LABEL]) {
1334                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1335                                   IPV6_FLOWLABEL_MASK;
1336                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1337                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1338                                             "Label attribute only applies for IPv6 Geneve devices");
1339                         return -EINVAL;
1340                 }
1341         }
1342
1343         if (data[IFLA_GENEVE_PORT]) {
1344                 if (changelink) {
1345                         attrtype = IFLA_GENEVE_PORT;
1346                         goto change_notsup;
1347                 }
1348                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1349         }
1350
1351         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1352                 if (changelink) {
1353                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1354                         goto change_notsup;
1355                 }
1356                 *metadata = true;
1357         }
1358
1359         if (data[IFLA_GENEVE_UDP_CSUM]) {
1360                 if (changelink) {
1361                         attrtype = IFLA_GENEVE_UDP_CSUM;
1362                         goto change_notsup;
1363                 }
1364                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1365                         info->key.tun_flags |= TUNNEL_CSUM;
1366         }
1367
1368         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1369 #if IS_ENABLED(CONFIG_IPV6)
1370                 if (changelink) {
1371                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1372                         goto change_notsup;
1373                 }
1374                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1375                         info->key.tun_flags &= ~TUNNEL_CSUM;
1376 #else
1377                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1378                                     "IPv6 support not enabled in the kernel");
1379                 return -EPFNOSUPPORT;
1380 #endif
1381         }
1382
1383         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1384 #if IS_ENABLED(CONFIG_IPV6)
1385                 if (changelink) {
1386                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1387                         goto change_notsup;
1388                 }
1389                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1390                         *use_udp6_rx_checksums = false;
1391 #else
1392                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1393                                     "IPv6 support not enabled in the kernel");
1394                 return -EPFNOSUPPORT;
1395 #endif
1396         }
1397
1398         return 0;
1399 change_notsup:
1400         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1401                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1402         return -EOPNOTSUPP;
1403 }
1404
1405 static void geneve_link_config(struct net_device *dev,
1406                                struct ip_tunnel_info *info, struct nlattr *tb[])
1407 {
1408         struct geneve_dev *geneve = netdev_priv(dev);
1409         int ldev_mtu = 0;
1410
1411         if (tb[IFLA_MTU]) {
1412                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1413                 return;
1414         }
1415
1416         switch (ip_tunnel_info_af(info)) {
1417         case AF_INET: {
1418                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1419                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1420
1421                 if (!IS_ERR(rt) && rt->dst.dev) {
1422                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1423                         ip_rt_put(rt);
1424                 }
1425                 break;
1426         }
1427 #if IS_ENABLED(CONFIG_IPV6)
1428         case AF_INET6: {
1429                 struct rt6_info *rt = rt6_lookup(geneve->net,
1430                                                  &info->key.u.ipv6.dst, NULL, 0,
1431                                                  NULL, 0);
1432
1433                 if (rt && rt->dst.dev)
1434                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1435                 ip6_rt_put(rt);
1436                 break;
1437         }
1438 #endif
1439         }
1440
1441         if (ldev_mtu <= 0)
1442                 return;
1443
1444         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1445 }
1446
1447 static int geneve_newlink(struct net *net, struct net_device *dev,
1448                           struct nlattr *tb[], struct nlattr *data[],
1449                           struct netlink_ext_ack *extack)
1450 {
1451         bool use_udp6_rx_checksums = false;
1452         struct ip_tunnel_info info;
1453         bool ttl_inherit = false;
1454         bool metadata = false;
1455         int err;
1456
1457         init_tnl_info(&info, GENEVE_UDP_PORT);
1458         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1459                              &use_udp6_rx_checksums, &ttl_inherit, false);
1460         if (err)
1461                 return err;
1462
1463         err = geneve_configure(net, dev, extack, &info, metadata,
1464                                use_udp6_rx_checksums, ttl_inherit);
1465         if (err)
1466                 return err;
1467
1468         geneve_link_config(dev, &info, tb);
1469
1470         return 0;
1471 }
1472
1473 /* Quiesces the geneve device data path for both TX and RX.
1474  *
1475  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1476  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1477  * to complete for the existing set of in-flight packets to be transmitted,
1478  * then we would have quiesced the transmit data path. All the future packets
1479  * will get dropped until we unquiesce the data path.
1480  *
1481  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1482  * if we set that to NULL under RCU and wait for synchronize_net() to
1483  * complete, then we would have quiesced the receive data path.
1484  */
1485 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1486                            struct geneve_sock **gs6)
1487 {
1488         *gs4 = rtnl_dereference(geneve->sock4);
1489         rcu_assign_pointer(geneve->sock4, NULL);
1490         if (*gs4)
1491                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1492 #if IS_ENABLED(CONFIG_IPV6)
1493         *gs6 = rtnl_dereference(geneve->sock6);
1494         rcu_assign_pointer(geneve->sock6, NULL);
1495         if (*gs6)
1496                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1497 #else
1498         *gs6 = NULL;
1499 #endif
1500         synchronize_net();
1501 }
1502
1503 /* Resumes the geneve device data path for both TX and RX. */
1504 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1505                              struct geneve_sock __maybe_unused *gs6)
1506 {
1507         rcu_assign_pointer(geneve->sock4, gs4);
1508         if (gs4)
1509                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1510 #if IS_ENABLED(CONFIG_IPV6)
1511         rcu_assign_pointer(geneve->sock6, gs6);
1512         if (gs6)
1513                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1514 #endif
1515         synchronize_net();
1516 }
1517
1518 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1519                              struct nlattr *data[],
1520                              struct netlink_ext_ack *extack)
1521 {
1522         struct geneve_dev *geneve = netdev_priv(dev);
1523         struct geneve_sock *gs4, *gs6;
1524         struct ip_tunnel_info info;
1525         bool metadata;
1526         bool use_udp6_rx_checksums;
1527         bool ttl_inherit;
1528         int err;
1529
1530         /* If the geneve device is configured for metadata (or externally
1531          * controlled, for example, OVS), then nothing can be changed.
1532          */
1533         if (geneve->collect_md)
1534                 return -EOPNOTSUPP;
1535
1536         /* Start with the existing info. */
1537         memcpy(&info, &geneve->info, sizeof(info));
1538         metadata = geneve->collect_md;
1539         use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
1540         ttl_inherit = geneve->ttl_inherit;
1541         err = geneve_nl2info(tb, data, extack, &info, &metadata,
1542                              &use_udp6_rx_checksums, &ttl_inherit, true);
1543         if (err)
1544                 return err;
1545
1546         if (!geneve_dst_addr_equal(&geneve->info, &info)) {
1547                 dst_cache_reset(&info.dst_cache);
1548                 geneve_link_config(dev, &info, tb);
1549         }
1550
1551         geneve_quiesce(geneve, &gs4, &gs6);
1552         geneve->info = info;
1553         geneve->collect_md = metadata;
1554         geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
1555         geneve->ttl_inherit = ttl_inherit;
1556         geneve_unquiesce(geneve, gs4, gs6);
1557
1558         return 0;
1559 }
1560
1561 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1562 {
1563         struct geneve_dev *geneve = netdev_priv(dev);
1564
1565         list_del(&geneve->next);
1566         unregister_netdevice_queue(dev, head);
1567 }
1568
1569 static size_t geneve_get_size(const struct net_device *dev)
1570 {
1571         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1572                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1573                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1574                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1575                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1576                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1577                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1578                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1579                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1580                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1581                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1582                 0;
1583 }
1584
1585 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1586 {
1587         struct geneve_dev *geneve = netdev_priv(dev);
1588         struct ip_tunnel_info *info = &geneve->info;
1589         bool ttl_inherit = geneve->ttl_inherit;
1590         bool metadata = geneve->collect_md;
1591         __u8 tmp_vni[3];
1592         __u32 vni;
1593
1594         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1595         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1596         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1597                 goto nla_put_failure;
1598
1599         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1600                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1601                                     info->key.u.ipv4.dst))
1602                         goto nla_put_failure;
1603                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1604                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1605                         goto nla_put_failure;
1606
1607 #if IS_ENABLED(CONFIG_IPV6)
1608         } else if (!metadata) {
1609                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1610                                      &info->key.u.ipv6.dst))
1611                         goto nla_put_failure;
1612                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1613                                !(info->key.tun_flags & TUNNEL_CSUM)))
1614                         goto nla_put_failure;
1615 #endif
1616         }
1617
1618         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1619             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1620             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1621                 goto nla_put_failure;
1622
1623         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1624                 goto nla_put_failure;
1625
1626         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1627                 goto nla_put_failure;
1628
1629 #if IS_ENABLED(CONFIG_IPV6)
1630         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1631                        !geneve->use_udp6_rx_checksums))
1632                 goto nla_put_failure;
1633 #endif
1634
1635         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1636                 goto nla_put_failure;
1637
1638         return 0;
1639
1640 nla_put_failure:
1641         return -EMSGSIZE;
1642 }
1643
1644 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1645         .kind           = "geneve",
1646         .maxtype        = IFLA_GENEVE_MAX,
1647         .policy         = geneve_policy,
1648         .priv_size      = sizeof(struct geneve_dev),
1649         .setup          = geneve_setup,
1650         .validate       = geneve_validate,
1651         .newlink        = geneve_newlink,
1652         .changelink     = geneve_changelink,
1653         .dellink        = geneve_dellink,
1654         .get_size       = geneve_get_size,
1655         .fill_info      = geneve_fill_info,
1656 };
1657
1658 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1659                                         u8 name_assign_type, u16 dst_port)
1660 {
1661         struct nlattr *tb[IFLA_MAX + 1];
1662         struct ip_tunnel_info info;
1663         struct net_device *dev;
1664         LIST_HEAD(list_kill);
1665         int err;
1666
1667         memset(tb, 0, sizeof(tb));
1668         dev = rtnl_create_link(net, name, name_assign_type,
1669                                &geneve_link_ops, tb, NULL);
1670         if (IS_ERR(dev))
1671                 return dev;
1672
1673         init_tnl_info(&info, dst_port);
1674         err = geneve_configure(net, dev, NULL, &info, true, true, false);
1675         if (err) {
1676                 free_netdev(dev);
1677                 return ERR_PTR(err);
1678         }
1679
1680         /* openvswitch users expect packet sizes to be unrestricted,
1681          * so set the largest MTU we can.
1682          */
1683         err = geneve_change_mtu(dev, IP_MAX_MTU);
1684         if (err)
1685                 goto err;
1686
1687         err = rtnl_configure_link(dev, NULL);
1688         if (err < 0)
1689                 goto err;
1690
1691         return dev;
1692 err:
1693         geneve_dellink(dev, &list_kill);
1694         unregister_netdevice_many(&list_kill);
1695         return ERR_PTR(err);
1696 }
1697 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1698
1699 static int geneve_netdevice_event(struct notifier_block *unused,
1700                                   unsigned long event, void *ptr)
1701 {
1702         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1703
1704         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1705             event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1706                 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1707         } else if (event == NETDEV_UNREGISTER) {
1708                 geneve_offload_rx_ports(dev, false);
1709         } else if (event == NETDEV_REGISTER) {
1710                 geneve_offload_rx_ports(dev, true);
1711         }
1712
1713         return NOTIFY_DONE;
1714 }
1715
1716 static struct notifier_block geneve_notifier_block __read_mostly = {
1717         .notifier_call = geneve_netdevice_event,
1718 };
1719
1720 static __net_init int geneve_init_net(struct net *net)
1721 {
1722         struct geneve_net *gn = net_generic(net, geneve_net_id);
1723
1724         INIT_LIST_HEAD(&gn->geneve_list);
1725         INIT_LIST_HEAD(&gn->sock_list);
1726         return 0;
1727 }
1728
1729 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1730 {
1731         struct geneve_net *gn = net_generic(net, geneve_net_id);
1732         struct geneve_dev *geneve, *next;
1733         struct net_device *dev, *aux;
1734
1735         /* gather any geneve devices that were moved into this ns */
1736         for_each_netdev_safe(net, dev, aux)
1737                 if (dev->rtnl_link_ops == &geneve_link_ops)
1738                         unregister_netdevice_queue(dev, head);
1739
1740         /* now gather any other geneve devices that were created in this ns */
1741         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1742                 /* If geneve->dev is in the same netns, it was already added
1743                  * to the list by the previous loop.
1744                  */
1745                 if (!net_eq(dev_net(geneve->dev), net))
1746                         unregister_netdevice_queue(geneve->dev, head);
1747         }
1748
1749         WARN_ON_ONCE(!list_empty(&gn->sock_list));
1750 }
1751
1752 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1753 {
1754         struct net *net;
1755         LIST_HEAD(list);
1756
1757         rtnl_lock();
1758         list_for_each_entry(net, net_list, exit_list)
1759                 geneve_destroy_tunnels(net, &list);
1760
1761         /* unregister the devices gathered above */
1762         unregister_netdevice_many(&list);
1763         rtnl_unlock();
1764 }
1765
1766 static struct pernet_operations geneve_net_ops = {
1767         .init = geneve_init_net,
1768         .exit_batch = geneve_exit_batch_net,
1769         .id   = &geneve_net_id,
1770         .size = sizeof(struct geneve_net),
1771 };
1772
1773 static int __init geneve_init_module(void)
1774 {
1775         int rc;
1776
1777         rc = register_pernet_subsys(&geneve_net_ops);
1778         if (rc)
1779                 goto out1;
1780
1781         rc = register_netdevice_notifier(&geneve_notifier_block);
1782         if (rc)
1783                 goto out2;
1784
1785         rc = rtnl_link_register(&geneve_link_ops);
1786         if (rc)
1787                 goto out3;
1788
1789         return 0;
1790 out3:
1791         unregister_netdevice_notifier(&geneve_notifier_block);
1792 out2:
1793         unregister_pernet_subsys(&geneve_net_ops);
1794 out1:
1795         return rc;
1796 }
1797 late_initcall(geneve_init_module);
1798
1799 static void __exit geneve_cleanup_module(void)
1800 {
1801         rtnl_link_unregister(&geneve_link_ops);
1802         unregister_netdevice_notifier(&geneve_notifier_block);
1803         unregister_pernet_subsys(&geneve_net_ops);
1804 }
1805 module_exit(geneve_cleanup_module);
1806
1807 MODULE_LICENSE("GPL");
1808 MODULE_VERSION(GENEVE_NETDEV_VER);
1809 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
1810 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
1811 MODULE_ALIAS_RTNL_LINK("geneve");