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/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/hash.h>
  14 #include <net/ipv6_stubs.h>
  15 #include <net/dst_metadata.h>
  16 #include <net/gro_cells.h>
  17 #include <net/rtnetlink.h>
  18 #include <net/geneve.h>
  19 #include <net/protocol.h>
  20
  21 #define GENEVE_NETDEV_VER       "0.6"
  22
  23 #define GENEVE_N_VID            (1u << 24)
  24 #define GENEVE_VID_MASK         (GENEVE_N_VID - 1)
  25
  26 #define VNI_HASH_BITS           10
  27 #define VNI_HASH_SIZE           (1<<VNI_HASH_BITS)
  28
  29 static bool log_ecn_error = true;
  30 module_param(log_ecn_error, bool, 0644);
  31 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  32
  33 #define GENEVE_VER 0
  34 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
  35 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
  36 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
  37
  38 /* per-network namespace private data for this module */
  39 struct geneve_net {
  40         struct list_head        geneve_list;
  41         struct list_head        sock_list;
  42 };
  43
  44 static unsigned int geneve_net_id;
  45
  46 struct geneve_dev_node {
  47         struct hlist_node hlist;
  48         struct geneve_dev *geneve;
  49 };
  50
  51 struct geneve_config {
  52         struct ip_tunnel_info   info;
  53         bool                    collect_md;
  54         bool                    use_udp6_rx_checksums;
  55         bool                    ttl_inherit;
  56         enum ifla_geneve_df     df;
  57 };
  58
  59 /* Pseudo network device */
  60 struct geneve_dev {
  61         struct geneve_dev_node hlist4;  /* vni hash table for IPv4 socket */
  62 #if IS_ENABLED(CONFIG_IPV6)
  63         struct geneve_dev_node hlist6;  /* vni hash table for IPv6 socket */
  64 #endif
  65         struct net         *net;        /* netns for packet i/o */
  66         struct net_device  *dev;        /* netdev for geneve tunnel */
  67         struct geneve_sock __rcu *sock4;        /* IPv4 socket used for geneve tunnel */
  68 #if IS_ENABLED(CONFIG_IPV6)
  69         struct geneve_sock __rcu *sock6;        /* IPv6 socket used for geneve tunnel */
  70 #endif
  71         struct list_head   next;        /* geneve's per namespace list */
  72         struct gro_cells   gro_cells;
  73         struct geneve_config cfg;
  74 };
  75
  76 struct geneve_sock {
  77         bool                    collect_md;
  78         struct list_head        list;
  79         struct socket           *sock;
  80         struct rcu_head         rcu;
  81         int                     refcnt;
  82         struct hlist_head       vni_list[VNI_HASH_SIZE];
  83 };
  84
  85 static inline __u32 geneve_net_vni_hash(u8 vni[3])
  86 {
  87         __u32 vnid;
  88
  89         vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
  90         return hash_32(vnid, VNI_HASH_BITS);
  91 }
  92
  93 static __be64 vni_to_tunnel_id(const __u8 *vni)
  94 {
  95 #ifdef __BIG_ENDIAN
  96         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
  97 #else
  98         return (__force __be64)(((__force u64)vni[0] << 40) |
  99                                 ((__force u64)vni[1] << 48) |
 100                                 ((__force u64)vni[2] << 56));
 101 #endif
 102 }
 103
 104 /* Convert 64 bit tunnel ID to 24 bit VNI. */
 105 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 106 {
 107 #ifdef __BIG_ENDIAN
 108         vni[0] = (__force __u8)(tun_id >> 16);
 109         vni[1] = (__force __u8)(tun_id >> 8);
 110         vni[2] = (__force __u8)tun_id;
 111 #else
 112         vni[0] = (__force __u8)((__force u64)tun_id >> 40);
 113         vni[1] = (__force __u8)((__force u64)tun_id >> 48);
 114         vni[2] = (__force __u8)((__force u64)tun_id >> 56);
 115 #endif
 116 }
 117
 118 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
 119 {
 120         return !memcmp(vni, &tun_id[5], 3);
 121 }
 122
 123 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
 124 {
 125         return gs->sock->sk->sk_family;
 126 }
 127
 128 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
 129                                         __be32 addr, u8 vni[])
 130 {
 131         struct hlist_head *vni_list_head;
 132         struct geneve_dev_node *node;
 133         __u32 hash;
 134
 135         /* Find the device for this VNI */
 136         hash = geneve_net_vni_hash(vni);
 137         vni_list_head = &gs->vni_list[hash];
 138         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 139                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 140                     addr == node->geneve->cfg.info.key.u.ipv4.dst)
 141                         return node->geneve;
 142         }
 143         return NULL;
 144 }
 145
 146 #if IS_ENABLED(CONFIG_IPV6)
 147 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
 148                                          struct in6_addr addr6, u8 vni[])
 149 {
 150         struct hlist_head *vni_list_head;
 151         struct geneve_dev_node *node;
 152         __u32 hash;
 153
 154         /* Find the device for this VNI */
 155         hash = geneve_net_vni_hash(vni);
 156         vni_list_head = &gs->vni_list[hash];
 157         hlist_for_each_entry_rcu(node, vni_list_head, hlist) {
 158                 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) &&
 159                     ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst))
 160                         return node->geneve;
 161         }
 162         return NULL;
 163 }
 164 #endif
 165
 166 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
 167 {
 168         return (struct genevehdr *)(udp_hdr(skb) + 1);
 169 }
 170
 171 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
 172                                             struct sk_buff *skb)
 173 {
 174         static u8 zero_vni[3];
 175         u8 *vni;
 176
 177         if (geneve_get_sk_family(gs) == AF_INET) {
 178                 struct iphdr *iph;
 179                 __be32 addr;
 180
 181                 iph = ip_hdr(skb); /* outer IP header... */
 182
 183                 if (gs->collect_md) {
 184                         vni = zero_vni;
 185                         addr = 0;
 186                 } else {
 187                         vni = geneve_hdr(skb)->vni;
 188                         addr = iph->saddr;
 189                 }
 190
 191                 return geneve_lookup(gs, addr, vni);
 192 #if IS_ENABLED(CONFIG_IPV6)
 193         } else if (geneve_get_sk_family(gs) == AF_INET6) {
 194                 static struct in6_addr zero_addr6;
 195                 struct ipv6hdr *ip6h;
 196                 struct in6_addr addr6;
 197
 198                 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
 199
 200                 if (gs->collect_md) {
 201                         vni = zero_vni;
 202                         addr6 = zero_addr6;
 203                 } else {
 204                         vni = geneve_hdr(skb)->vni;
 205                         addr6 = ip6h->saddr;
 206                 }
 207
 208                 return geneve6_lookup(gs, addr6, vni);
 209 #endif
 210         }
 211         return NULL;
 212 }
 213
 214 /* geneve receive/decap routine */
 215 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
 216                       struct sk_buff *skb)
 217 {
 218         struct genevehdr *gnvh = geneve_hdr(skb);
 219         struct metadata_dst *tun_dst = NULL;
 220         unsigned int len;
 221         int nh, err = 0;
 222         void *oiph;
 223
 224         if (ip_tunnel_collect_metadata() || gs->collect_md) {
 225                 __be16 flags;
 226
 227                 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) |
 228                         (gnvh->critical ? TUNNEL_CRIT_OPT : 0);
 229
 230                 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags,
 231                                          vni_to_tunnel_id(gnvh->vni),
 232                                          gnvh->opt_len * 4);
 233                 if (!tun_dst) {
 234                         geneve->dev->stats.rx_dropped++;
 235                         goto drop;
 236                 }
 237                 /* Update tunnel dst according to Geneve options. */
 238                 ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
 239                                         gnvh->options, gnvh->opt_len * 4,
 240                                         TUNNEL_GENEVE_OPT);
 241         } else {
 242                 /* Drop packets w/ critical options,
 243                  * since we don't support any...
 244                  */
 245                 if (gnvh->critical) {
 246                         geneve->dev->stats.rx_frame_errors++;
 247                         geneve->dev->stats.rx_errors++;
 248                         goto drop;
 249                 }
 250         }
 251
 252         skb_reset_mac_header(skb);
 253         skb->protocol = eth_type_trans(skb, geneve->dev);
 254         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
 255
 256         if (tun_dst)
 257                 skb_dst_set(skb, &tun_dst->dst);
 258
 259         /* Ignore packet loops (and multicast echo) */
 260         if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
 261                 geneve->dev->stats.rx_errors++;
 262                 goto drop;
 263         }
 264
 265         /* Save offset of outer header relative to skb->head,
 266          * because we are going to reset the network header to the inner header
 267          * and might change skb->head.
 268          */
 269         nh = skb_network_header(skb) - skb->head;
 270
 271         skb_reset_network_header(skb);
 272
 273         if (!pskb_inet_may_pull(skb)) {
 274                 DEV_STATS_INC(geneve->dev, rx_length_errors);
 275                 DEV_STATS_INC(geneve->dev, rx_errors);
 276                 goto drop;
 277         }
 278
 279         /* Get the outer header. */
 280         oiph = skb->head + nh;
 281
 282         if (geneve_get_sk_family(gs) == AF_INET)
 283                 err = IP_ECN_decapsulate(oiph, skb);
 284 #if IS_ENABLED(CONFIG_IPV6)
 285         else
 286                 err = IP6_ECN_decapsulate(oiph, skb);
 287 #endif
 288
 289         if (unlikely(err)) {
 290                 if (log_ecn_error) {
 291                         if (geneve_get_sk_family(gs) == AF_INET)
 292                                 net_info_ratelimited("non-ECT from %pI4 "
 293                                                      "with TOS=%#x\n",
 294                                                      &((struct iphdr *)oiph)->saddr,
 295                                                      ((struct iphdr *)oiph)->tos);
 296 #if IS_ENABLED(CONFIG_IPV6)
 297                         else
 298                                 net_info_ratelimited("non-ECT from %pI6\n",
 299                                                      &((struct ipv6hdr *)oiph)->saddr);
 300 #endif
 301                 }
 302                 if (err > 1) {
 303                         ++geneve->dev->stats.rx_frame_errors;
 304                         ++geneve->dev->stats.rx_errors;
 305                         goto drop;
 306                 }
 307         }
 308
 309         len = skb->len;
 310         err = gro_cells_receive(&geneve->gro_cells, skb);
 311         if (likely(err == NET_RX_SUCCESS))
 312                 dev_sw_netstats_rx_add(geneve->dev, len);
 313
 314         return;
 315 drop:
 316         /* Consume bad packet */
 317         kfree_skb(skb);
 318 }
 319
 320 /* Setup stats when device is created */
 321 static int geneve_init(struct net_device *dev)
 322 {
 323         struct geneve_dev *geneve = netdev_priv(dev);
 324         int err;
 325
 326         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 327         if (!dev->tstats)
 328                 return -ENOMEM;
 329
 330         err = gro_cells_init(&geneve->gro_cells, dev);
 331         if (err) {
 332                 free_percpu(dev->tstats);
 333                 return err;
 334         }
 335
 336         err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL);
 337         if (err) {
 338                 free_percpu(dev->tstats);
 339                 gro_cells_destroy(&geneve->gro_cells);
 340                 return err;
 341         }
 342         return 0;
 343 }
 344
 345 static void geneve_uninit(struct net_device *dev)
 346 {
 347         struct geneve_dev *geneve = netdev_priv(dev);
 348
 349         dst_cache_destroy(&geneve->cfg.info.dst_cache);
 350         gro_cells_destroy(&geneve->gro_cells);
 351         free_percpu(dev->tstats);
 352 }
 353
 354 /* Callback from net/ipv4/udp.c to receive packets */
 355 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 356 {
 357         struct genevehdr *geneveh;
 358         struct geneve_dev *geneve;
 359         struct geneve_sock *gs;
 360         int opts_len;
 361
 362         /* Need UDP and Geneve header to be present */
 363         if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
 364                 goto drop;
 365
 366         /* Return packets with reserved bits set */
 367         geneveh = geneve_hdr(skb);
 368         if (unlikely(geneveh->ver != GENEVE_VER))
 369                 goto drop;
 370
 371         if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
 372                 goto drop;
 373
 374         gs = rcu_dereference_sk_user_data(sk);
 375         if (!gs)
 376                 goto drop;
 377
 378         geneve = geneve_lookup_skb(gs, skb);
 379         if (!geneve)
 380                 goto drop;
 381
 382         opts_len = geneveh->opt_len * 4;
 383         if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
 384                                  htons(ETH_P_TEB),
 385                                  !net_eq(geneve->net, dev_net(geneve->dev)))) {
 386                 geneve->dev->stats.rx_dropped++;
 387                 goto drop;
 388         }
 389
 390         geneve_rx(geneve, gs, skb);
 391         return 0;
 392
 393 drop:
 394         /* Consume bad packet */
 395         kfree_skb(skb);
 396         return 0;
 397 }
 398
 399 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */
 400 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
 401 {
 402         struct genevehdr *geneveh;
 403         struct geneve_sock *gs;
 404         u8 zero_vni[3] = { 0 };
 405         u8 *vni = zero_vni;
 406
 407         if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN))
 408                 return -EINVAL;
 409
 410         geneveh = geneve_hdr(skb);
 411         if (geneveh->ver != GENEVE_VER)
 412                 return -EINVAL;
 413
 414         if (geneveh->proto_type != htons(ETH_P_TEB))
 415                 return -EINVAL;
 416
 417         gs = rcu_dereference_sk_user_data(sk);
 418         if (!gs)
 419                 return -ENOENT;
 420
 421         if (geneve_get_sk_family(gs) == AF_INET) {
 422                 struct iphdr *iph = ip_hdr(skb);
 423                 __be32 addr4 = 0;
 424
 425                 if (!gs->collect_md) {
 426                         vni = geneve_hdr(skb)->vni;
 427                         addr4 = iph->daddr;
 428                 }
 429
 430                 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT;
 431         }
 432
 433 #if IS_ENABLED(CONFIG_IPV6)
 434         if (geneve_get_sk_family(gs) == AF_INET6) {
 435                 struct ipv6hdr *ip6h = ipv6_hdr(skb);
 436                 struct in6_addr addr6;
 437
 438                 memset(&addr6, 0, sizeof(struct in6_addr));
 439
 440                 if (!gs->collect_md) {
 441                         vni = geneve_hdr(skb)->vni;
 442                         addr6 = ip6h->daddr;
 443                 }
 444
 445                 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT;
 446         }
 447 #endif
 448
 449         return -EPFNOSUPPORT;
 450 }
 451
 452 static struct socket *geneve_create_sock(struct net *net, bool ipv6,
 453                                          __be16 port, bool ipv6_rx_csum)
 454 {
 455         struct socket *sock;
 456         struct udp_port_cfg udp_conf;
 457         int err;
 458
 459         memset(&udp_conf, 0, sizeof(udp_conf));
 460
 461         if (ipv6) {
 462                 udp_conf.family = AF_INET6;
 463                 udp_conf.ipv6_v6only = 1;
 464                 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
 465         } else {
 466                 udp_conf.family = AF_INET;
 467                 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 468         }
 469
 470         udp_conf.local_udp_port = port;
 471
 472         /* Open UDP socket */
 473         err = udp_sock_create(net, &udp_conf, &sock);
 474         if (err < 0)
 475                 return ERR_PTR(err);
 476
 477         return sock;
 478 }
 479
 480 static int geneve_hlen(struct genevehdr *gh)
 481 {
 482         return sizeof(*gh) + gh->opt_len * 4;
 483 }
 484
 485 static struct sk_buff *geneve_gro_receive(struct sock *sk,
 486                                           struct list_head *head,
 487                                           struct sk_buff *skb)
 488 {
 489         struct sk_buff *pp = NULL;
 490         struct sk_buff *p;
 491         struct genevehdr *gh, *gh2;
 492         unsigned int hlen, gh_len, off_gnv;
 493         const struct packet_offload *ptype;
 494         __be16 type;
 495         int flush = 1;
 496
 497         off_gnv = skb_gro_offset(skb);
 498         hlen = off_gnv + sizeof(*gh);
 499         gh = skb_gro_header_fast(skb, off_gnv);
 500         if (skb_gro_header_hard(skb, hlen)) {
 501                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 502                 if (unlikely(!gh))
 503                         goto out;
 504         }
 505
 506         if (gh->ver != GENEVE_VER || gh->oam)
 507                 goto out;
 508         gh_len = geneve_hlen(gh);
 509
 510         hlen = off_gnv + gh_len;
 511         if (skb_gro_header_hard(skb, hlen)) {
 512                 gh = skb_gro_header_slow(skb, hlen, off_gnv);
 513                 if (unlikely(!gh))
 514                         goto out;
 515         }
 516
 517         list_for_each_entry(p, head, list) {
 518                 if (!NAPI_GRO_CB(p)->same_flow)
 519                         continue;
 520
 521                 gh2 = (struct genevehdr *)(p->data + off_gnv);
 522                 if (gh->opt_len != gh2->opt_len ||
 523                     memcmp(gh, gh2, gh_len)) {
 524                         NAPI_GRO_CB(p)->same_flow = 0;
 525                         continue;
 526                 }
 527         }
 528
 529         type = gh->proto_type;
 530
 531         rcu_read_lock();
 532         ptype = gro_find_receive_by_type(type);
 533         if (!ptype)
 534                 goto out_unlock;
 535
 536         skb_gro_pull(skb, gh_len);
 537         skb_gro_postpull_rcsum(skb, gh, gh_len);
 538         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 539         flush = 0;
 540
 541 out_unlock:
 542         rcu_read_unlock();
 543 out:
 544         skb_gro_flush_final(skb, pp, flush);
 545
 546         return pp;
 547 }
 548
 549 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
 550                                int nhoff)
 551 {
 552         struct genevehdr *gh;
 553         struct packet_offload *ptype;
 554         __be16 type;
 555         int gh_len;
 556         int err = -ENOSYS;
 557
 558         gh = (struct genevehdr *)(skb->data + nhoff);
 559         gh_len = geneve_hlen(gh);
 560         type = gh->proto_type;
 561
 562         rcu_read_lock();
 563         ptype = gro_find_complete_by_type(type);
 564         if (ptype)
 565                 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
 566
 567         rcu_read_unlock();
 568
 569         skb_set_inner_mac_header(skb, nhoff + gh_len);
 570
 571         return err;
 572 }
 573
 574 /* Create new listen socket if needed */
 575 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
 576                                                 bool ipv6, bool ipv6_rx_csum)
 577 {
 578         struct geneve_net *gn = net_generic(net, geneve_net_id);
 579         struct geneve_sock *gs;
 580         struct socket *sock;
 581         struct udp_tunnel_sock_cfg tunnel_cfg;
 582         int h;
 583
 584         gs = kzalloc(sizeof(*gs), GFP_KERNEL);
 585         if (!gs)
 586                 return ERR_PTR(-ENOMEM);
 587
 588         sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum);
 589         if (IS_ERR(sock)) {
 590                 kfree(gs);
 591                 return ERR_CAST(sock);
 592         }
 593
 594         gs->sock = sock;
 595         gs->refcnt = 1;
 596         for (h = 0; h < VNI_HASH_SIZE; ++h)
 597                 INIT_HLIST_HEAD(&gs->vni_list[h]);
 598
 599         /* Initialize the geneve udp offloads structure */
 600         udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 601
 602         /* Mark socket as an encapsulation socket */
 603         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
 604         tunnel_cfg.sk_user_data = gs;
 605         tunnel_cfg.encap_type = 1;
 606         tunnel_cfg.gro_receive = geneve_gro_receive;
 607         tunnel_cfg.gro_complete = geneve_gro_complete;
 608         tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
 609         tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup;
 610         tunnel_cfg.encap_destroy = NULL;
 611         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
 612         list_add(&gs->list, &gn->sock_list);
 613         return gs;
 614 }
 615
 616 static void __geneve_sock_release(struct geneve_sock *gs)
 617 {
 618         if (!gs || --gs->refcnt)
 619                 return;
 620
 621         list_del(&gs->list);
 622         udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
 623         udp_tunnel_sock_release(gs->sock);
 624         kfree_rcu(gs, rcu);
 625 }
 626
 627 static void geneve_sock_release(struct geneve_dev *geneve)
 628 {
 629         struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
 630 #if IS_ENABLED(CONFIG_IPV6)
 631         struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
 632
 633         rcu_assign_pointer(geneve->sock6, NULL);
 634 #endif
 635
 636         rcu_assign_pointer(geneve->sock4, NULL);
 637         synchronize_net();
 638
 639         __geneve_sock_release(gs4);
 640 #if IS_ENABLED(CONFIG_IPV6)
 641         __geneve_sock_release(gs6);
 642 #endif
 643 }
 644
 645 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
 646                                             sa_family_t family,
 647                                             __be16 dst_port)
 648 {
 649         struct geneve_sock *gs;
 650
 651         list_for_each_entry(gs, &gn->sock_list, list) {
 652                 if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
 653                     geneve_get_sk_family(gs) == family) {
 654                         return gs;
 655                 }
 656         }
 657         return NULL;
 658 }
 659
 660 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
 661 {
 662         struct net *net = geneve->net;
 663         struct geneve_net *gn = net_generic(net, geneve_net_id);
 664         struct geneve_dev_node *node;
 665         struct geneve_sock *gs;
 666         __u8 vni[3];
 667         __u32 hash;
 668
 669         gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst);
 670         if (gs) {
 671                 gs->refcnt++;
 672                 goto out;
 673         }
 674
 675         gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6,
 676                                   geneve->cfg.use_udp6_rx_checksums);
 677         if (IS_ERR(gs))
 678                 return PTR_ERR(gs);
 679
 680 out:
 681         gs->collect_md = geneve->cfg.collect_md;
 682 #if IS_ENABLED(CONFIG_IPV6)
 683         if (ipv6) {
 684                 rcu_assign_pointer(geneve->sock6, gs);
 685                 node = &geneve->hlist6;
 686         } else
 687 #endif
 688         {
 689                 rcu_assign_pointer(geneve->sock4, gs);
 690                 node = &geneve->hlist4;
 691         }
 692         node->geneve = geneve;
 693
 694         tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni);
 695         hash = geneve_net_vni_hash(vni);
 696         hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]);
 697         return 0;
 698 }
 699
 700 static int geneve_open(struct net_device *dev)
 701 {
 702         struct geneve_dev *geneve = netdev_priv(dev);
 703         bool metadata = geneve->cfg.collect_md;
 704         bool ipv4, ipv6;
 705         int ret = 0;
 706
 707         ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata;
 708         ipv4 = !ipv6 || metadata;
 709 #if IS_ENABLED(CONFIG_IPV6)
 710         if (ipv6) {
 711                 ret = geneve_sock_add(geneve, true);
 712                 if (ret < 0 && ret != -EAFNOSUPPORT)
 713                         ipv4 = false;
 714         }
 715 #endif
 716         if (ipv4)
 717                 ret = geneve_sock_add(geneve, false);
 718         if (ret < 0)
 719                 geneve_sock_release(geneve);
 720
 721         return ret;
 722 }
 723
 724 static int geneve_stop(struct net_device *dev)
 725 {
 726         struct geneve_dev *geneve = netdev_priv(dev);
 727
 728         hlist_del_init_rcu(&geneve->hlist4.hlist);
 729 #if IS_ENABLED(CONFIG_IPV6)
 730         hlist_del_init_rcu(&geneve->hlist6.hlist);
 731 #endif
 732         geneve_sock_release(geneve);
 733         return 0;
 734 }
 735
 736 static void geneve_build_header(struct genevehdr *geneveh,
 737                                 const struct ip_tunnel_info *info)
 738 {
 739         geneveh->ver = GENEVE_VER;
 740         geneveh->opt_len = info->options_len / 4;
 741         geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
 742         geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
 743         geneveh->rsvd1 = 0;
 744         tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
 745         geneveh->proto_type = htons(ETH_P_TEB);
 746         geneveh->rsvd2 = 0;
 747
 748         if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
 749                 ip_tunnel_info_opts_get(geneveh->options, info);
 750 }
 751
 752 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
 753                             const struct ip_tunnel_info *info,
 754                             bool xnet, int ip_hdr_len)
 755 {
 756         bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
 757         struct genevehdr *gnvh;
 758         int min_headroom;
 759         int err;
 760
 761         skb_reset_mac_header(skb);
 762         skb_scrub_packet(skb, xnet);
 763
 764         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
 765                        GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
 766         err = skb_cow_head(skb, min_headroom);
 767         if (unlikely(err))
 768                 goto free_dst;
 769
 770         err = udp_tunnel_handle_offloads(skb, udp_sum);
 771         if (err)
 772                 goto free_dst;
 773
 774         gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
 775         geneve_build_header(gnvh, info);
 776         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
 777         return 0;
 778
 779 free_dst:
 780         dst_release(dst);
 781         return err;
 782 }
 783
 784 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
 785                                        struct net_device *dev,
 786                                        struct geneve_sock *gs4,
 787                                        struct flowi4 *fl4,
 788                                        const struct ip_tunnel_info *info,
 789                                        __be16 dport, __be16 sport,
 790                                        __u8 *full_tos)
 791 {
 792         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 793         struct geneve_dev *geneve = netdev_priv(dev);
 794         struct dst_cache *dst_cache;
 795         struct rtable *rt = NULL;
 796         __u8 tos;
 797
 798         if (!gs4)
 799                 return ERR_PTR(-EIO);
 800
 801         memset(fl4, 0, sizeof(*fl4));
 802         fl4->flowi4_mark = skb->mark;
 803         fl4->flowi4_proto = IPPROTO_UDP;
 804         fl4->daddr = info->key.u.ipv4.dst;
 805         fl4->saddr = info->key.u.ipv4.src;
 806         fl4->fl4_dport = dport;
 807         fl4->fl4_sport = sport;
 808
 809         tos = info->key.tos;
 810         if ((tos == 1) && !geneve->cfg.collect_md) {
 811                 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 812                 use_cache = false;
 813         }
 814         fl4->flowi4_tos = RT_TOS(tos);
 815         if (full_tos)
 816                 *full_tos = tos;
 817
 818         dst_cache = (struct dst_cache *)&info->dst_cache;
 819         if (use_cache) {
 820                 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
 821                 if (rt)
 822                         return rt;
 823         }
 824         rt = ip_route_output_key(geneve->net, fl4);
 825         if (IS_ERR(rt)) {
 826                 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
 827                 return ERR_PTR(-ENETUNREACH);
 828         }
 829         if (rt->dst.dev == dev) { /* is this necessary? */
 830                 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
 831                 ip_rt_put(rt);
 832                 return ERR_PTR(-ELOOP);
 833         }
 834         if (use_cache)
 835                 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
 836         return rt;
 837 }
 838
 839 #if IS_ENABLED(CONFIG_IPV6)
 840 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
 841                                            struct net_device *dev,
 842                                            struct geneve_sock *gs6,
 843                                            struct flowi6 *fl6,
 844                                            const struct ip_tunnel_info *info,
 845                                            __be16 dport, __be16 sport)
 846 {
 847         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
 848         struct geneve_dev *geneve = netdev_priv(dev);
 849         struct dst_entry *dst = NULL;
 850         struct dst_cache *dst_cache;
 851         __u8 prio;
 852
 853         if (!gs6)
 854                 return ERR_PTR(-EIO);
 855
 856         memset(fl6, 0, sizeof(*fl6));
 857         fl6->flowi6_mark = skb->mark;
 858         fl6->flowi6_proto = IPPROTO_UDP;
 859         fl6->daddr = info->key.u.ipv6.dst;
 860         fl6->saddr = info->key.u.ipv6.src;
 861         fl6->fl6_dport = dport;
 862         fl6->fl6_sport = sport;
 863
 864         prio = info->key.tos;
 865         if ((prio == 1) && !geneve->cfg.collect_md) {
 866                 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
 867                 use_cache = false;
 868         }
 869
 870         fl6->flowlabel = ip6_make_flowinfo(prio, info->key.label);
 871         dst_cache = (struct dst_cache *)&info->dst_cache;
 872         if (use_cache) {
 873                 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
 874                 if (dst)
 875                         return dst;
 876         }
 877         dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
 878                                               NULL);
 879         if (IS_ERR(dst)) {
 880                 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
 881                 return ERR_PTR(-ENETUNREACH);
 882         }
 883         if (dst->dev == dev) { /* is this necessary? */
 884                 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
 885                 dst_release(dst);
 886                 return ERR_PTR(-ELOOP);
 887         }
 888
 889         if (use_cache)
 890                 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
 891         return dst;
 892 }
 893 #endif
 894
 895 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 896                            struct geneve_dev *geneve,
 897                            const struct ip_tunnel_info *info)
 898 {
 899         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 900         struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
 901         const struct ip_tunnel_key *key = &info->key;
 902         struct rtable *rt;
 903         struct flowi4 fl4;
 904         __u8 full_tos;
 905         __u8 tos, ttl;
 906         __be16 df = 0;
 907         __be16 sport;
 908         int err;
 909
 910         if (!skb_vlan_inet_prepare(skb))
 911                 return -EINVAL;
 912
 913         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 914         rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
 915                               geneve->cfg.info.key.tp_dst, sport, &full_tos);
 916         if (IS_ERR(rt))
 917                 return PTR_ERR(rt);
 918
 919         err = skb_tunnel_check_pmtu(skb, &rt->dst,
 920                                     GENEVE_IPV4_HLEN + info->options_len,
 921                                     netif_is_any_bridge_port(dev));
 922         if (err < 0) {
 923                 dst_release(&rt->dst);
 924                 return err;
 925         } else if (err) {
 926                 struct ip_tunnel_info *info;
 927
 928                 info = skb_tunnel_info(skb);
 929                 if (info) {
 930                         struct ip_tunnel_info *unclone;
 931
 932                         unclone = skb_tunnel_info_unclone(skb);
 933                         if (unlikely(!unclone)) {
 934                                 dst_release(&rt->dst);
 935                                 return -ENOMEM;
 936                         }
 937
 938                         unclone->key.u.ipv4.dst = fl4.saddr;
 939                         unclone->key.u.ipv4.src = fl4.daddr;
 940                 }
 941
 942                 if (!pskb_may_pull(skb, ETH_HLEN)) {
 943                         dst_release(&rt->dst);
 944                         return -EINVAL;
 945                 }
 946
 947                 skb->protocol = eth_type_trans(skb, geneve->dev);
 948                 netif_rx(skb);
 949                 dst_release(&rt->dst);
 950                 return -EMSGSIZE;
 951         }
 952
 953         if (geneve->cfg.collect_md) {
 954                 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 955                 ttl = key->ttl;
 956
 957                 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 958         } else {
 959                 tos = ip_tunnel_ecn_encap(full_tos, ip_hdr(skb), skb);
 960                 if (geneve->cfg.ttl_inherit)
 961                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
 962                 else
 963                         ttl = key->ttl;
 964                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
 965
 966                 if (geneve->cfg.df == GENEVE_DF_SET) {
 967                         df = htons(IP_DF);
 968                 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) {
 969                         struct ethhdr *eth = eth_hdr(skb);
 970
 971                         if (ntohs(eth->h_proto) == ETH_P_IPV6) {
 972                                 df = htons(IP_DF);
 973                         } else if (ntohs(eth->h_proto) == ETH_P_IP) {
 974                                 struct iphdr *iph = ip_hdr(skb);
 975
 976                                 if (iph->frag_off & htons(IP_DF))
 977                                         df = htons(IP_DF);
 978                         }
 979                 }
 980         }
 981
 982         err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
 983         if (unlikely(err))
 984                 return err;
 985
 986         udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
 987                             tos, ttl, df, sport, geneve->cfg.info.key.tp_dst,
 988                             !net_eq(geneve->net, dev_net(geneve->dev)),
 989                             !(info->key.tun_flags & TUNNEL_CSUM));
 990         return 0;
 991 }
 992
 993 #if IS_ENABLED(CONFIG_IPV6)
 994 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 995                             struct geneve_dev *geneve,
 996                             const struct ip_tunnel_info *info)
 997 {
 998         bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
 999         struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1000         const struct ip_tunnel_key *key = &info->key;
1001         struct dst_entry *dst = NULL;
1002         struct flowi6 fl6;
1003         __u8 prio, ttl;
1004         __be16 sport;
1005         int err;
1006
1007         if (!skb_vlan_inet_prepare(skb))
1008                 return -EINVAL;
1009
1010         sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
1011         dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1012                                 geneve->cfg.info.key.tp_dst, sport);
1013         if (IS_ERR(dst))
1014                 return PTR_ERR(dst);
1015
1016         err = skb_tunnel_check_pmtu(skb, dst,
1017                                     GENEVE_IPV6_HLEN + info->options_len,
1018                                     netif_is_any_bridge_port(dev));
1019         if (err < 0) {
1020                 dst_release(dst);
1021                 return err;
1022         } else if (err) {
1023                 struct ip_tunnel_info *info = skb_tunnel_info(skb);
1024
1025                 if (info) {
1026                         struct ip_tunnel_info *unclone;
1027
1028                         unclone = skb_tunnel_info_unclone(skb);
1029                         if (unlikely(!unclone)) {
1030                                 dst_release(dst);
1031                                 return -ENOMEM;
1032                         }
1033
1034                         unclone->key.u.ipv6.dst = fl6.saddr;
1035                         unclone->key.u.ipv6.src = fl6.daddr;
1036                 }
1037
1038                 if (!pskb_may_pull(skb, ETH_HLEN)) {
1039                         dst_release(dst);
1040                         return -EINVAL;
1041                 }
1042
1043                 skb->protocol = eth_type_trans(skb, geneve->dev);
1044                 netif_rx(skb);
1045                 dst_release(dst);
1046                 return -EMSGSIZE;
1047         }
1048
1049         if (geneve->cfg.collect_md) {
1050                 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
1051                 ttl = key->ttl;
1052         } else {
1053                 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
1054                                            ip_hdr(skb), skb);
1055                 if (geneve->cfg.ttl_inherit)
1056                         ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb);
1057                 else
1058                         ttl = key->ttl;
1059                 ttl = ttl ? : ip6_dst_hoplimit(dst);
1060         }
1061         err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
1062         if (unlikely(err))
1063                 return err;
1064
1065         udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
1066                              &fl6.saddr, &fl6.daddr, prio, ttl,
1067                              info->key.label, sport, geneve->cfg.info.key.tp_dst,
1068                              !(info->key.tun_flags & TUNNEL_CSUM));
1069         return 0;
1070 }
1071 #endif
1072
1073 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
1074 {
1075         struct geneve_dev *geneve = netdev_priv(dev);
1076         struct ip_tunnel_info *info = NULL;
1077         int err;
1078
1079         if (geneve->cfg.collect_md) {
1080                 info = skb_tunnel_info(skb);
1081                 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
1082                         netdev_dbg(dev, "no tunnel metadata\n");
1083                         dev_kfree_skb(skb);
1084                         dev->stats.tx_dropped++;
1085                         return NETDEV_TX_OK;
1086                 }
1087         } else {
1088                 info = &geneve->cfg.info;
1089         }
1090
1091         rcu_read_lock();
1092 #if IS_ENABLED(CONFIG_IPV6)
1093         if (info->mode & IP_TUNNEL_INFO_IPV6)
1094                 err = geneve6_xmit_skb(skb, dev, geneve, info);
1095         else
1096 #endif
1097                 err = geneve_xmit_skb(skb, dev, geneve, info);
1098         rcu_read_unlock();
1099
1100         if (likely(!err))
1101                 return NETDEV_TX_OK;
1102
1103         if (err != -EMSGSIZE)
1104                 dev_kfree_skb(skb);
1105
1106         if (err == -ELOOP)
1107                 dev->stats.collisions++;
1108         else if (err == -ENETUNREACH)
1109                 dev->stats.tx_carrier_errors++;
1110
1111         dev->stats.tx_errors++;
1112         return NETDEV_TX_OK;
1113 }
1114
1115 static int geneve_change_mtu(struct net_device *dev, int new_mtu)
1116 {
1117         if (new_mtu > dev->max_mtu)
1118                 new_mtu = dev->max_mtu;
1119         else if (new_mtu < dev->min_mtu)
1120                 new_mtu = dev->min_mtu;
1121
1122         dev->mtu = new_mtu;
1123         return 0;
1124 }
1125
1126 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
1127 {
1128         struct ip_tunnel_info *info = skb_tunnel_info(skb);
1129         struct geneve_dev *geneve = netdev_priv(dev);
1130         __be16 sport;
1131
1132         if (ip_tunnel_info_af(info) == AF_INET) {
1133                 struct rtable *rt;
1134                 struct flowi4 fl4;
1135
1136                 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
1137                 sport = udp_flow_src_port(geneve->net, skb,
1138                                           1, USHRT_MAX, true);
1139
1140                 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
1141                                       geneve->cfg.info.key.tp_dst, sport, NULL);
1142                 if (IS_ERR(rt))
1143                         return PTR_ERR(rt);
1144
1145                 ip_rt_put(rt);
1146                 info->key.u.ipv4.src = fl4.saddr;
1147 #if IS_ENABLED(CONFIG_IPV6)
1148         } else if (ip_tunnel_info_af(info) == AF_INET6) {
1149                 struct dst_entry *dst;
1150                 struct flowi6 fl6;
1151
1152                 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
1153                 sport = udp_flow_src_port(geneve->net, skb,
1154                                           1, USHRT_MAX, true);
1155
1156                 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
1157                                         geneve->cfg.info.key.tp_dst, sport);
1158                 if (IS_ERR(dst))
1159                         return PTR_ERR(dst);
1160
1161                 dst_release(dst);
1162                 info->key.u.ipv6.src = fl6.saddr;
1163 #endif
1164         } else {
1165                 return -EINVAL;
1166         }
1167
1168         info->key.tp_src = sport;
1169         info->key.tp_dst = geneve->cfg.info.key.tp_dst;
1170         return 0;
1171 }
1172
1173 static const struct net_device_ops geneve_netdev_ops = {
1174         .ndo_init               = geneve_init,
1175         .ndo_uninit             = geneve_uninit,
1176         .ndo_open               = geneve_open,
1177         .ndo_stop               = geneve_stop,
1178         .ndo_start_xmit         = geneve_xmit,
1179         .ndo_get_stats64        = ip_tunnel_get_stats64,
1180         .ndo_change_mtu         = geneve_change_mtu,
1181         .ndo_validate_addr      = eth_validate_addr,
1182         .ndo_set_mac_address    = eth_mac_addr,
1183         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,
1184 };
1185
1186 static void geneve_get_drvinfo(struct net_device *dev,
1187                                struct ethtool_drvinfo *drvinfo)
1188 {
1189         strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
1190         strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
1191 }
1192
1193 static const struct ethtool_ops geneve_ethtool_ops = {
1194         .get_drvinfo    = geneve_get_drvinfo,
1195         .get_link       = ethtool_op_get_link,
1196 };
1197
1198 /* Info for udev, that this is a virtual tunnel endpoint */
1199 static struct device_type geneve_type = {
1200         .name = "geneve",
1201 };
1202
1203 /* Calls the ndo_udp_tunnel_add of the caller in order to
1204  * supply the listening GENEVE udp ports. Callers are expected
1205  * to implement the ndo_udp_tunnel_add.
1206  */
1207 static void geneve_offload_rx_ports(struct net_device *dev, bool push)
1208 {
1209         struct net *net = dev_net(dev);
1210         struct geneve_net *gn = net_generic(net, geneve_net_id);
1211         struct geneve_sock *gs;
1212
1213         rcu_read_lock();
1214         list_for_each_entry_rcu(gs, &gn->sock_list, list) {
1215                 if (push) {
1216                         udp_tunnel_push_rx_port(dev, gs->sock,
1217                                                 UDP_TUNNEL_TYPE_GENEVE);
1218                 } else {
1219                         udp_tunnel_drop_rx_port(dev, gs->sock,
1220                                                 UDP_TUNNEL_TYPE_GENEVE);
1221                 }
1222         }
1223         rcu_read_unlock();
1224 }
1225
1226 /* Initialize the device structure. */
1227 static void geneve_setup(struct net_device *dev)
1228 {
1229         ether_setup(dev);
1230
1231         dev->netdev_ops = &geneve_netdev_ops;
1232         dev->ethtool_ops = &geneve_ethtool_ops;
1233         dev->needs_free_netdev = true;
1234
1235         SET_NETDEV_DEVTYPE(dev, &geneve_type);
1236
1237         dev->features    |= NETIF_F_LLTX;
1238         dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM;
1239         dev->features    |= NETIF_F_RXCSUM;
1240         dev->features    |= NETIF_F_GSO_SOFTWARE;
1241
1242         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1243         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1244
1245         /* MTU range: 68 - (something less than 65535) */
1246         dev->min_mtu = ETH_MIN_MTU;
1247         /* The max_mtu calculation does not take account of GENEVE
1248          * options, to avoid excluding potentially valid
1249          * configurations. This will be further reduced by IPvX hdr size.
1250          */
1251         dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
1252
1253         netif_keep_dst(dev);
1254         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1255         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
1256         eth_hw_addr_random(dev);
1257 }
1258
1259 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
1260         [IFLA_GENEVE_ID]                = { .type = NLA_U32 },
1261         [IFLA_GENEVE_REMOTE]            = { .len = sizeof_field(struct iphdr, daddr) },
1262         [IFLA_GENEVE_REMOTE6]           = { .len = sizeof(struct in6_addr) },
1263         [IFLA_GENEVE_TTL]               = { .type = NLA_U8 },
1264         [IFLA_GENEVE_TOS]               = { .type = NLA_U8 },
1265         [IFLA_GENEVE_LABEL]             = { .type = NLA_U32 },
1266         [IFLA_GENEVE_PORT]              = { .type = NLA_U16 },
1267         [IFLA_GENEVE_COLLECT_METADATA]  = { .type = NLA_FLAG },
1268         [IFLA_GENEVE_UDP_CSUM]          = { .type = NLA_U8 },
1269         [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
1270         [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
1271         [IFLA_GENEVE_TTL_INHERIT]       = { .type = NLA_U8 },
1272         [IFLA_GENEVE_DF]                = { .type = NLA_U8 },
1273 };
1274
1275 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
1276                            struct netlink_ext_ack *extack)
1277 {
1278         if (tb[IFLA_ADDRESS]) {
1279                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
1280                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1281                                             "Provided link layer address is not Ethernet");
1282                         return -EINVAL;
1283                 }
1284
1285                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
1286                         NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
1287                                             "Provided Ethernet address is not unicast");
1288                         return -EADDRNOTAVAIL;
1289                 }
1290         }
1291
1292         if (!data) {
1293                 NL_SET_ERR_MSG(extack,
1294                                "Not enough attributes provided to perform the operation");
1295                 return -EINVAL;
1296         }
1297
1298         if (data[IFLA_GENEVE_ID]) {
1299                 __u32 vni =  nla_get_u32(data[IFLA_GENEVE_ID]);
1300
1301                 if (vni >= GENEVE_N_VID) {
1302                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
1303                                             "Geneve ID must be lower than 16777216");
1304                         return -ERANGE;
1305                 }
1306         }
1307
1308         if (data[IFLA_GENEVE_DF]) {
1309                 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
1310
1311                 if (df < 0 || df > GENEVE_DF_MAX) {
1312                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
1313                                             "Invalid DF attribute");
1314                         return -EINVAL;
1315                 }
1316         }
1317
1318         return 0;
1319 }
1320
1321 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
1322                                           const struct ip_tunnel_info *info,
1323                                           bool *tun_on_same_port,
1324                                           bool *tun_collect_md)
1325 {
1326         struct geneve_dev *geneve, *t = NULL;
1327
1328         *tun_on_same_port = false;
1329         *tun_collect_md = false;
1330         list_for_each_entry(geneve, &gn->geneve_list, next) {
1331                 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) {
1332                         *tun_collect_md = geneve->cfg.collect_md;
1333                         *tun_on_same_port = true;
1334                 }
1335                 if (info->key.tun_id == geneve->cfg.info.key.tun_id &&
1336                     info->key.tp_dst == geneve->cfg.info.key.tp_dst &&
1337                     !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u)))
1338                         t = geneve;
1339         }
1340         return t;
1341 }
1342
1343 static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
1344 {
1345         return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
1346                  info->key.ttl || info->key.label || info->key.tp_src ||
1347                  memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
1348 }
1349
1350 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
1351                                   struct ip_tunnel_info *b)
1352 {
1353         if (ip_tunnel_info_af(a) == AF_INET)
1354                 return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
1355         else
1356                 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
1357 }
1358
1359 static int geneve_configure(struct net *net, struct net_device *dev,
1360                             struct netlink_ext_ack *extack,
1361                             const struct geneve_config *cfg)
1362 {
1363         struct geneve_net *gn = net_generic(net, geneve_net_id);
1364         struct geneve_dev *t, *geneve = netdev_priv(dev);
1365         const struct ip_tunnel_info *info = &cfg->info;
1366         bool tun_collect_md, tun_on_same_port;
1367         int err, encap_len;
1368
1369         if (cfg->collect_md && !is_tnl_info_zero(info)) {
1370                 NL_SET_ERR_MSG(extack,
1371                                "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
1372                 return -EINVAL;
1373         }
1374
1375         geneve->net = net;
1376         geneve->dev = dev;
1377
1378         t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
1379         if (t)
1380                 return -EBUSY;
1381
1382         /* make enough headroom for basic scenario */
1383         encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
1384         if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) {
1385                 encap_len += sizeof(struct iphdr);
1386                 dev->max_mtu -= sizeof(struct iphdr);
1387         } else {
1388                 encap_len += sizeof(struct ipv6hdr);
1389                 dev->max_mtu -= sizeof(struct ipv6hdr);
1390         }
1391         dev->needed_headroom = encap_len + ETH_HLEN;
1392
1393         if (cfg->collect_md) {
1394                 if (tun_on_same_port) {
1395                         NL_SET_ERR_MSG(extack,
1396                                        "There can be only one externally controlled device on a destination port");
1397                         return -EPERM;
1398                 }
1399         } else {
1400                 if (tun_collect_md) {
1401                         NL_SET_ERR_MSG(extack,
1402                                        "There already exists an externally controlled device on this destination port");
1403                         return -EPERM;
1404                 }
1405         }
1406
1407         dst_cache_reset(&geneve->cfg.info.dst_cache);
1408         memcpy(&geneve->cfg, cfg, sizeof(*cfg));
1409
1410         err = register_netdevice(dev);
1411         if (err)
1412                 return err;
1413
1414         list_add(&geneve->next, &gn->geneve_list);
1415         return 0;
1416 }
1417
1418 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
1419 {
1420         memset(info, 0, sizeof(*info));
1421         info->key.tp_dst = htons(dst_port);
1422 }
1423
1424 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
1425                           struct netlink_ext_ack *extack,
1426                           struct geneve_config *cfg, bool changelink)
1427 {
1428         struct ip_tunnel_info *info = &cfg->info;
1429         int attrtype;
1430
1431         if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
1432                 NL_SET_ERR_MSG(extack,
1433                                "Cannot specify both IPv4 and IPv6 Remote addresses");
1434                 return -EINVAL;
1435         }
1436
1437         if (data[IFLA_GENEVE_REMOTE]) {
1438                 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
1439                         attrtype = IFLA_GENEVE_REMOTE;
1440                         goto change_notsup;
1441                 }
1442
1443                 info->key.u.ipv4.dst =
1444                         nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
1445
1446                 if (ipv4_is_multicast(info->key.u.ipv4.dst)) {
1447                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
1448                                             "Remote IPv4 address cannot be Multicast");
1449                         return -EINVAL;
1450                 }
1451         }
1452
1453         if (data[IFLA_GENEVE_REMOTE6]) {
1454 #if IS_ENABLED(CONFIG_IPV6)
1455                 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
1456                         attrtype = IFLA_GENEVE_REMOTE6;
1457                         goto change_notsup;
1458                 }
1459
1460                 info->mode = IP_TUNNEL_INFO_IPV6;
1461                 info->key.u.ipv6.dst =
1462                         nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
1463
1464                 if (ipv6_addr_type(&info->key.u.ipv6.dst) &
1465                     IPV6_ADDR_LINKLOCAL) {
1466                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1467                                             "Remote IPv6 address cannot be link-local");
1468                         return -EINVAL;
1469                 }
1470                 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
1471                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1472                                             "Remote IPv6 address cannot be Multicast");
1473                         return -EINVAL;
1474                 }
1475                 info->key.tun_flags |= TUNNEL_CSUM;
1476                 cfg->use_udp6_rx_checksums = true;
1477 #else
1478                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
1479                                     "IPv6 support not enabled in the kernel");
1480                 return -EPFNOSUPPORT;
1481 #endif
1482         }
1483
1484         if (data[IFLA_GENEVE_ID]) {
1485                 __u32 vni;
1486                 __u8 tvni[3];
1487                 __be64 tunid;
1488
1489                 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
1490                 tvni[0] = (vni & 0x00ff0000) >> 16;
1491                 tvni[1] = (vni & 0x0000ff00) >> 8;
1492                 tvni[2] =  vni & 0x000000ff;
1493
1494                 tunid = vni_to_tunnel_id(tvni);
1495                 if (changelink && (tunid != info->key.tun_id)) {
1496                         attrtype = IFLA_GENEVE_ID;
1497                         goto change_notsup;
1498                 }
1499                 info->key.tun_id = tunid;
1500         }
1501
1502         if (data[IFLA_GENEVE_TTL_INHERIT]) {
1503                 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT]))
1504                         cfg->ttl_inherit = true;
1505                 else
1506                         cfg->ttl_inherit = false;
1507         } else if (data[IFLA_GENEVE_TTL]) {
1508                 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
1509                 cfg->ttl_inherit = false;
1510         }
1511
1512         if (data[IFLA_GENEVE_TOS])
1513                 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
1514
1515         if (data[IFLA_GENEVE_DF])
1516                 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]);
1517
1518         if (data[IFLA_GENEVE_LABEL]) {
1519                 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
1520                                   IPV6_FLOWLABEL_MASK;
1521                 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
1522                         NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
1523                                             "Label attribute only applies for IPv6 Geneve devices");
1524                         return -EINVAL;
1525                 }
1526         }
1527
1528         if (data[IFLA_GENEVE_PORT]) {
1529                 if (changelink) {
1530                         attrtype = IFLA_GENEVE_PORT;
1531                         goto change_notsup;
1532                 }
1533                 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
1534         }
1535
1536         if (data[IFLA_GENEVE_COLLECT_METADATA]) {
1537                 if (changelink) {
1538                         attrtype = IFLA_GENEVE_COLLECT_METADATA;
1539                         goto change_notsup;
1540                 }
1541                 cfg->collect_md = true;
1542         }
1543
1544         if (data[IFLA_GENEVE_UDP_CSUM]) {
1545                 if (changelink) {
1546                         attrtype = IFLA_GENEVE_UDP_CSUM;
1547                         goto change_notsup;
1548                 }
1549                 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
1550                         info->key.tun_flags |= TUNNEL_CSUM;
1551         }
1552
1553         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
1554 #if IS_ENABLED(CONFIG_IPV6)
1555                 if (changelink) {
1556                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
1557                         goto change_notsup;
1558                 }
1559                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
1560                         info->key.tun_flags &= ~TUNNEL_CSUM;
1561 #else
1562                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
1563                                     "IPv6 support not enabled in the kernel");
1564                 return -EPFNOSUPPORT;
1565 #endif
1566         }
1567
1568         if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
1569 #if IS_ENABLED(CONFIG_IPV6)
1570                 if (changelink) {
1571                         attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
1572                         goto change_notsup;
1573                 }
1574                 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
1575                         cfg->use_udp6_rx_checksums = false;
1576 #else
1577                 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
1578                                     "IPv6 support not enabled in the kernel");
1579                 return -EPFNOSUPPORT;
1580 #endif
1581         }
1582
1583         return 0;
1584 change_notsup:
1585         NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
1586                             "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
1587         return -EOPNOTSUPP;
1588 }
1589
1590 static void geneve_link_config(struct net_device *dev,
1591                                struct ip_tunnel_info *info, struct nlattr *tb[])
1592 {
1593         struct geneve_dev *geneve = netdev_priv(dev);
1594         int ldev_mtu = 0;
1595
1596         if (tb[IFLA_MTU]) {
1597                 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1598                 return;
1599         }
1600
1601         switch (ip_tunnel_info_af(info)) {
1602         case AF_INET: {
1603                 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
1604                 struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
1605
1606                 if (!IS_ERR(rt) && rt->dst.dev) {
1607                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
1608                         ip_rt_put(rt);
1609                 }
1610                 break;
1611         }
1612 #if IS_ENABLED(CONFIG_IPV6)
1613         case AF_INET6: {
1614                 struct rt6_info *rt;
1615
1616                 if (!__in6_dev_get(dev))
1617                         break;
1618
1619                 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
1620                                 NULL, 0);
1621
1622                 if (rt && rt->dst.dev)
1623                         ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
1624                 ip6_rt_put(rt);
1625                 break;
1626         }
1627 #endif
1628         }
1629
1630         if (ldev_mtu <= 0)
1631                 return;
1632
1633         geneve_change_mtu(dev, ldev_mtu - info->options_len);
1634 }
1635
1636 static int geneve_newlink(struct net *net, struct net_device *dev,
1637                           struct nlattr *tb[], struct nlattr *data[],
1638                           struct netlink_ext_ack *extack)
1639 {
1640         struct geneve_config cfg = {
1641                 .df = GENEVE_DF_UNSET,
1642                 .use_udp6_rx_checksums = false,
1643                 .ttl_inherit = false,
1644                 .collect_md = false,
1645         };
1646         int err;
1647
1648         init_tnl_info(&cfg.info, GENEVE_UDP_PORT);
1649         err = geneve_nl2info(tb, data, extack, &cfg, false);
1650         if (err)
1651                 return err;
1652
1653         err = geneve_configure(net, dev, extack, &cfg);
1654         if (err)
1655                 return err;
1656
1657         geneve_link_config(dev, &cfg.info, tb);
1658
1659         return 0;
1660 }
1661
1662 /* Quiesces the geneve device data path for both TX and RX.
1663  *
1664  * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
1665  * So, if we set that socket to NULL under RCU and wait for synchronize_net()
1666  * to complete for the existing set of in-flight packets to be transmitted,
1667  * then we would have quiesced the transmit data path. All the future packets
1668  * will get dropped until we unquiesce the data path.
1669  *
1670  * On receive geneve dereference the geneve_sock stashed in the socket. So,
1671  * if we set that to NULL under RCU and wait for synchronize_net() to
1672  * complete, then we would have quiesced the receive data path.
1673  */
1674 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
1675                            struct geneve_sock **gs6)
1676 {
1677         *gs4 = rtnl_dereference(geneve->sock4);
1678         rcu_assign_pointer(geneve->sock4, NULL);
1679         if (*gs4)
1680                 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
1681 #if IS_ENABLED(CONFIG_IPV6)
1682         *gs6 = rtnl_dereference(geneve->sock6);
1683         rcu_assign_pointer(geneve->sock6, NULL);
1684         if (*gs6)
1685                 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
1686 #else
1687         *gs6 = NULL;
1688 #endif
1689         synchronize_net();
1690 }
1691
1692 /* Resumes the geneve device data path for both TX and RX. */
1693 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
1694                              struct geneve_sock __maybe_unused *gs6)
1695 {
1696         rcu_assign_pointer(geneve->sock4, gs4);
1697         if (gs4)
1698                 rcu_assign_sk_user_data(gs4->sock->sk, gs4);
1699 #if IS_ENABLED(CONFIG_IPV6)
1700         rcu_assign_pointer(geneve->sock6, gs6);
1701         if (gs6)
1702                 rcu_assign_sk_user_data(gs6->sock->sk, gs6);
1703 #endif
1704         synchronize_net();
1705 }
1706
1707 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
1708                              struct nlattr *data[],
1709                              struct netlink_ext_ack *extack)
1710 {
1711         struct geneve_dev *geneve = netdev_priv(dev);
1712         struct geneve_sock *gs4, *gs6;
1713         struct geneve_config cfg;
1714         int err;
1715
1716         /* If the geneve device is configured for metadata (or externally
1717          * controlled, for example, OVS), then nothing can be changed.
1718          */
1719         if (geneve->cfg.collect_md)
1720                 return -EOPNOTSUPP;
1721
1722         /* Start with the existing info. */
1723         memcpy(&cfg, &geneve->cfg, sizeof(cfg));
1724         err = geneve_nl2info(tb, data, extack, &cfg, true);
1725         if (err)
1726                 return err;
1727
1728         if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) {
1729                 dst_cache_reset(&cfg.info.dst_cache);
1730                 geneve_link_config(dev, &cfg.info, tb);
1731         }
1732
1733         geneve_quiesce(geneve, &gs4, &gs6);
1734         memcpy(&geneve->cfg, &cfg, sizeof(cfg));
1735         geneve_unquiesce(geneve, gs4, gs6);
1736
1737         return 0;
1738 }
1739
1740 static void geneve_dellink(struct net_device *dev, struct list_head *head)
1741 {
1742         struct geneve_dev *geneve = netdev_priv(dev);
1743
1744         list_del(&geneve->next);
1745         unregister_netdevice_queue(dev, head);
1746 }
1747
1748 static size_t geneve_get_size(const struct net_device *dev)
1749 {
1750         return nla_total_size(sizeof(__u32)) +  /* IFLA_GENEVE_ID */
1751                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
1752                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TTL */
1753                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_TOS */
1754                 nla_total_size(sizeof(__u8)) +  /* IFLA_GENEVE_DF */
1755                 nla_total_size(sizeof(__be32)) +  /* IFLA_GENEVE_LABEL */
1756                 nla_total_size(sizeof(__be16)) +  /* IFLA_GENEVE_PORT */
1757                 nla_total_size(0) +      /* IFLA_GENEVE_COLLECT_METADATA */
1758                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
1759                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
1760                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
1761                 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */
1762                 0;
1763 }
1764
1765 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
1766 {
1767         struct geneve_dev *geneve = netdev_priv(dev);
1768         struct ip_tunnel_info *info = &geneve->cfg.info;
1769         bool ttl_inherit = geneve->cfg.ttl_inherit;
1770         bool metadata = geneve->cfg.collect_md;
1771         __u8 tmp_vni[3];
1772         __u32 vni;
1773
1774         tunnel_id_to_vni(info->key.tun_id, tmp_vni);
1775         vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
1776         if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
1777                 goto nla_put_failure;
1778
1779         if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
1780                 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
1781                                     info->key.u.ipv4.dst))
1782                         goto nla_put_failure;
1783                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
1784                                !!(info->key.tun_flags & TUNNEL_CSUM)))
1785                         goto nla_put_failure;
1786
1787 #if IS_ENABLED(CONFIG_IPV6)
1788         } else if (!metadata) {
1789                 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
1790                                      &info->key.u.ipv6.dst))
1791                         goto nla_put_failure;
1792                 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
1793                                !(info->key.tun_flags & TUNNEL_CSUM)))
1794                         goto nla_put_failure;
1795 #endif
1796         }
1797
1798         if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
1799             nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
1800             nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
1801                 goto nla_put_failure;
1802
1803         if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df))
1804                 goto nla_put_failure;
1805
1806         if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
1807                 goto nla_put_failure;
1808
1809         if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
1810                 goto nla_put_failure;
1811
1812 #if IS_ENABLED(CONFIG_IPV6)
1813         if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
1814                        !geneve->cfg.use_udp6_rx_checksums))
1815                 goto nla_put_failure;
1816 #endif
1817
1818         if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
1819                 goto nla_put_failure;
1820
1821         return 0;
1822
1823 nla_put_failure:
1824         return -EMSGSIZE;
1825 }
1826
1827 static struct rtnl_link_ops geneve_link_ops __read_mostly = {
1828         .kind           = "geneve",
1829         .maxtype        = IFLA_GENEVE_MAX,
1830         .policy         = geneve_policy,
1831         .priv_size      = sizeof(struct geneve_dev),
1832         .setup          = geneve_setup,
1833         .validate       = geneve_validate,
1834         .newlink        = geneve_newlink,
1835         .changelink     = geneve_changelink,
1836         .dellink        = geneve_dellink,
1837         .get_size       = geneve_get_size,
1838         .fill_info      = geneve_fill_info,
1839 };
1840
1841 struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
1842                                         u8 name_assign_type, u16 dst_port)
1843 {
1844         struct nlattr *tb[IFLA_MAX + 1];
1845         struct net_device *dev;
1846         LIST_HEAD(list_kill);
1847         int err;
1848         struct geneve_config cfg = {
1849                 .df = GENEVE_DF_UNSET,
1850                 .use_udp6_rx_checksums = true,
1851                 .ttl_inherit = false,
1852                 .collect_md = true,
1853         };
1854
1855         memset(tb, 0, sizeof(tb));
1856         dev = rtnl_create_link(net, name, name_assign_type,
1857                                &geneve_link_ops, tb, NULL);
1858         if (IS_ERR(dev))
1859                 return dev;
1860
1861         init_tnl_info(&cfg.info, dst_port);
1862         err = geneve_configure(net, dev, NULL, &cfg);
1863         if (err) {
1864                 free_netdev(dev);
1865                 return ERR_PTR(err);
1866         }
1867
1868         /* openvswitch users expect packet sizes to be unrestricted,
1869          * so set the largest MTU we can.
1870          */
1871         err = geneve_change_mtu(dev, IP_MAX_MTU);
1872         if (err)
1873                 goto err;
1874
1875         err = rtnl_configure_link(dev, NULL);
1876         if (err < 0)
1877                 goto err;
1878
1879         return dev;
1880 err:
1881         geneve_dellink(dev, &list_kill);
1882         unregister_netdevice_many(&list_kill);
1883         return ERR_PTR(err);
1884 }
1885 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
1886
1887 static int geneve_netdevice_event(struct notifier_block *unused,
1888                                   unsigned long event, void *ptr)
1889 {
1890         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1891
1892         if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
1893             event == NETDEV_UDP_TUNNEL_DROP_INFO) {
1894                 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
1895         } else if (event == NETDEV_UNREGISTER) {
1896                 if (!dev->udp_tunnel_nic_info)
1897                         geneve_offload_rx_ports(dev, false);
1898         } else if (event == NETDEV_REGISTER) {
1899                 if (!dev->udp_tunnel_nic_info)
1900                         geneve_offload_rx_ports(dev, true);
1901         }
1902
1903         return NOTIFY_DONE;
1904 }
1905
1906 static struct notifier_block geneve_notifier_block __read_mostly = {
1907         .notifier_call = geneve_netdevice_event,
1908 };
1909
1910 static __net_init int geneve_init_net(struct net *net)
1911 {
1912         struct geneve_net *gn = net_generic(net, geneve_net_id);
1913
1914         INIT_LIST_HEAD(&gn->geneve_list);
1915         INIT_LIST_HEAD(&gn->sock_list);
1916         return 0;
1917 }
1918
1919 static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
1920 {
1921         struct geneve_net *gn = net_generic(net, geneve_net_id);
1922         struct geneve_dev *geneve, *next;
1923         struct net_device *dev, *aux;
1924
1925         /* gather any geneve devices that were moved into this ns */
1926         for_each_netdev_safe(net, dev, aux)
1927                 if (dev->rtnl_link_ops == &geneve_link_ops)
1928                         unregister_netdevice_queue(dev, head);
1929
1930         /* now gather any other geneve devices that were created in this ns */
1931         list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
1932                 /* If geneve->dev is in the same netns, it was already added
1933                  * to the list by the previous loop.
1934                  */
1935                 if (!net_eq(dev_net(geneve->dev), net))
1936                         unregister_netdevice_queue(geneve->dev, head);
1937         }
1938 }
1939
1940 static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
1941 {
1942         struct net *net;
1943         LIST_HEAD(list);
1944
1945         rtnl_lock();
1946         list_for_each_entry(net, net_list, exit_list)
1947                 geneve_destroy_tunnels(net, &list);
1948
1949         /* unregister the devices gathered above */
1950         unregister_netdevice_many(&list);
1951         rtnl_unlock();
1952
1953         list_for_each_entry(net, net_list, exit_list) {
1954                 const struct geneve_net *gn = net_generic(net, geneve_net_id);
1955
1956                 WARN_ON_ONCE(!list_empty(&gn->sock_list));
1957         }
1958 }
1959
1960 static struct pernet_operations geneve_net_ops = {
1961         .init = geneve_init_net,
1962         .exit_batch = geneve_exit_batch_net,
1963         .id   = &geneve_net_id,
1964         .size = sizeof(struct geneve_net),
1965 };
1966
1967 static int __init geneve_init_module(void)
1968 {
1969         int rc;
1970
1971         rc = register_pernet_subsys(&geneve_net_ops);
1972         if (rc)
1973                 goto out1;
1974
1975         rc = register_netdevice_notifier(&geneve_notifier_block);
1976         if (rc)
1977                 goto out2;
1978
1979         rc = rtnl_link_register(&geneve_link_ops);
1980         if (rc)
1981                 goto out3;
1982
1983         return 0;
1984 out3:
1985         unregister_netdevice_notifier(&geneve_notifier_block);
1986 out2:
1987         unregister_pernet_subsys(&geneve_net_ops);
1988 out1:
1989         return rc;
1990 }
1991 late_initcall(geneve_init_module);
1992
1993 static void __exit geneve_cleanup_module(void)
1994 {
1995         rtnl_link_unregister(&geneve_link_ops);
1996         unregister_netdevice_notifier(&geneve_notifier_block);
1997         unregister_pernet_subsys(&geneve_net_ops);
1998 }
1999 module_exit(geneve_cleanup_module);
2000
2001 MODULE_LICENSE("GPL");
2002 MODULE_VERSION(GENEVE_NETDEV_VER);
2003 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
2004 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
2005 MODULE_ALIAS_RTNL_LINK("geneve");