drivers/net/vxlan.c

   1 /*
   2  * VXLAN: Virtual eXtensible Local Area Network
   3  *
   4  * Copyright (c) 2012-2013 Vyatta 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/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/udp.h>
  18 #include <linux/igmp.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/ethtool.h>
  21 #include <net/arp.h>
  22 #include <net/ndisc.h>
  23 #include <net/ip.h>
  24 #include <net/icmp.h>
  25 #include <net/rtnetlink.h>
  26 #include <net/inet_ecn.h>
  27 #include <net/net_namespace.h>
  28 #include <net/netns/generic.h>
  29 #include <net/vxlan.h>
  30
  31 #if IS_ENABLED(CONFIG_IPV6)
  32 #include <net/ip6_tunnel.h>
  33 #include <net/ip6_checksum.h>
  34 #endif
  35
  36 #define VXLAN_VERSION   "0.1"
  37
  38 #define PORT_HASH_BITS  8
  39 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  40 #define FDB_AGE_DEFAULT 300 /* 5 min */
  41 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  42
  43 /* UDP port for VXLAN traffic.
  44  * The IANA assigned port is 4789, but the Linux default is 8472
  45  * for compatibility with early adopters.
  46  */
  47 static unsigned short vxlan_port __read_mostly = 8472;
  48 module_param_named(udp_port, vxlan_port, ushort, 0444);
  49 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  50
  51 static bool log_ecn_error = true;
  52 module_param(log_ecn_error, bool, 0644);
  53 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  54
  55 static unsigned int vxlan_net_id;
  56 static struct rtnl_link_ops vxlan_link_ops;
  57
  58 static const u8 all_zeros_mac[ETH_ALEN + 2];
  59
  60 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  61
  62 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
  63
  64 /* per-network namespace private data for this module */
  65 struct vxlan_net {
  66         struct list_head  vxlan_list;
  67         struct hlist_head sock_list[PORT_HASH_SIZE];
  68         spinlock_t        sock_lock;
  69 };
  70
  71 /* Forwarding table entry */
  72 struct vxlan_fdb {
  73         struct hlist_node hlist;        /* linked list of entries */
  74         struct rcu_head   rcu;
  75         unsigned long     updated;      /* jiffies */
  76         unsigned long     used;
  77         struct list_head  remotes;
  78         u8                eth_addr[ETH_ALEN];
  79         u16               state;        /* see ndm_state */
  80         __be32            vni;
  81         u8                flags;        /* see ndm_flags */
  82 };
  83
  84 /* salt for hash table */
  85 static u32 vxlan_salt __read_mostly;
  86
  87 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
  88 {
  89         return vs->flags & VXLAN_F_COLLECT_METADATA ||
  90                ip_tunnel_collect_metadata();
  91 }
  92
  93 #if IS_ENABLED(CONFIG_IPV6)
  94 static inline
  95 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
  96 {
  97         if (a->sa.sa_family != b->sa.sa_family)
  98                 return false;
  99         if (a->sa.sa_family == AF_INET6)
 100                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 101         else
 102                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 103 }
 104
 105 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 106 {
 107         if (ipa->sa.sa_family == AF_INET6)
 108                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 109         else
 110                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 111 }
 112
 113 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 114 {
 115         if (ipa->sa.sa_family == AF_INET6)
 116                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 117         else
 118                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 119 }
 120
 121 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 122 {
 123         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 124                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 125                 ip->sa.sa_family = AF_INET6;
 126                 return 0;
 127         } else if (nla_len(nla) >= sizeof(__be32)) {
 128                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 129                 ip->sa.sa_family = AF_INET;
 130                 return 0;
 131         } else {
 132                 return -EAFNOSUPPORT;
 133         }
 134 }
 135
 136 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 137                               const union vxlan_addr *ip)
 138 {
 139         if (ip->sa.sa_family == AF_INET6)
 140                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 141         else
 142                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 143 }
 144
 145 #else /* !CONFIG_IPV6 */
 146
 147 static inline
 148 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 149 {
 150         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 151 }
 152
 153 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 154 {
 155         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 156 }
 157
 158 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 159 {
 160         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 161 }
 162
 163 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 164 {
 165         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 166                 return -EAFNOSUPPORT;
 167         } else if (nla_len(nla) >= sizeof(__be32)) {
 168                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 169                 ip->sa.sa_family = AF_INET;
 170                 return 0;
 171         } else {
 172                 return -EAFNOSUPPORT;
 173         }
 174 }
 175
 176 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 177                               const union vxlan_addr *ip)
 178 {
 179         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 180 }
 181 #endif
 182
 183 /* Virtual Network hash table head */
 184 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
 185 {
 186         return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
 187 }
 188
 189 /* Socket hash table head */
 190 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 191 {
 192         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 193
 194         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 195 }
 196
 197 /* First remote destination for a forwarding entry.
 198  * Guaranteed to be non-NULL because remotes are never deleted.
 199  */
 200 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 201 {
 202         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 203 }
 204
 205 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 206 {
 207         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 208 }
 209
 210 /* Find VXLAN socket based on network namespace, address family and UDP port
 211  * and enabled unshareable flags.
 212  */
 213 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 214                                           __be16 port, u32 flags)
 215 {
 216         struct vxlan_sock *vs;
 217
 218         flags &= VXLAN_F_RCV_FLAGS;
 219
 220         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 221                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 222                     vxlan_get_sk_family(vs) == family &&
 223                     vs->flags == flags)
 224                         return vs;
 225         }
 226         return NULL;
 227 }
 228
 229 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
 230                                            __be32 vni)
 231 {
 232         struct vxlan_dev_node *node;
 233
 234         /* For flow based devices, map all packets to VNI 0 */
 235         if (vs->flags & VXLAN_F_COLLECT_METADATA)
 236                 vni = 0;
 237
 238         hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
 239                 if (node->vxlan->default_dst.remote_vni != vni)
 240                         continue;
 241
 242                 if (IS_ENABLED(CONFIG_IPV6)) {
 243                         const struct vxlan_config *cfg = &node->vxlan->cfg;
 244
 245                         if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
 246                             cfg->remote_ifindex != ifindex)
 247                                 continue;
 248                 }
 249
 250                 return node->vxlan;
 251         }
 252
 253         return NULL;
 254 }
 255
 256 /* Look up VNI in a per net namespace table */
 257 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
 258                                         __be32 vni, sa_family_t family,
 259                                         __be16 port, u32 flags)
 260 {
 261         struct vxlan_sock *vs;
 262
 263         vs = vxlan_find_sock(net, family, port, flags);
 264         if (!vs)
 265                 return NULL;
 266
 267         return vxlan_vs_find_vni(vs, ifindex, vni);
 268 }
 269
 270 /* Fill in neighbour message in skbuff. */
 271 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 272                           const struct vxlan_fdb *fdb,
 273                           u32 portid, u32 seq, int type, unsigned int flags,
 274                           const struct vxlan_rdst *rdst)
 275 {
 276         unsigned long now = jiffies;
 277         struct nda_cacheinfo ci;
 278         struct nlmsghdr *nlh;
 279         struct ndmsg *ndm;
 280         bool send_ip, send_eth;
 281
 282         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 283         if (nlh == NULL)
 284                 return -EMSGSIZE;
 285
 286         ndm = nlmsg_data(nlh);
 287         memset(ndm, 0, sizeof(*ndm));
 288
 289         send_eth = send_ip = true;
 290
 291         if (type == RTM_GETNEIGH) {
 292                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 293                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 294                 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
 295         } else
 296                 ndm->ndm_family = AF_BRIDGE;
 297         ndm->ndm_state = fdb->state;
 298         ndm->ndm_ifindex = vxlan->dev->ifindex;
 299         ndm->ndm_flags = fdb->flags;
 300         ndm->ndm_type = RTN_UNICAST;
 301
 302         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 303             nla_put_s32(skb, NDA_LINK_NETNSID,
 304                         peernet2id(dev_net(vxlan->dev), vxlan->net)))
 305                 goto nla_put_failure;
 306
 307         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 308                 goto nla_put_failure;
 309
 310         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 311                 goto nla_put_failure;
 312
 313         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 314             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 315                 goto nla_put_failure;
 316         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 317             nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
 318                 goto nla_put_failure;
 319         if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
 320             nla_put_u32(skb, NDA_SRC_VNI,
 321                         be32_to_cpu(fdb->vni)))
 322                 goto nla_put_failure;
 323         if (rdst->remote_ifindex &&
 324             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 325                 goto nla_put_failure;
 326
 327         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 328         ci.ndm_confirmed = 0;
 329         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 330         ci.ndm_refcnt    = 0;
 331
 332         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 333                 goto nla_put_failure;
 334
 335         nlmsg_end(skb, nlh);
 336         return 0;
 337
 338 nla_put_failure:
 339         nlmsg_cancel(skb, nlh);
 340         return -EMSGSIZE;
 341 }
 342
 343 static inline size_t vxlan_nlmsg_size(void)
 344 {
 345         return NLMSG_ALIGN(sizeof(struct ndmsg))
 346                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 347                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 348                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 349                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 350                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 351                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 352                 + nla_total_size(sizeof(struct nda_cacheinfo));
 353 }
 354
 355 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 356                              struct vxlan_rdst *rd, int type)
 357 {
 358         struct net *net = dev_net(vxlan->dev);
 359         struct sk_buff *skb;
 360         int err = -ENOBUFS;
 361
 362         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 363         if (skb == NULL)
 364                 goto errout;
 365
 366         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 367         if (err < 0) {
 368                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 369                 WARN_ON(err == -EMSGSIZE);
 370                 kfree_skb(skb);
 371                 goto errout;
 372         }
 373
 374         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 375         return;
 376 errout:
 377         if (err < 0)
 378                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 379 }
 380
 381 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 382 {
 383         struct vxlan_dev *vxlan = netdev_priv(dev);
 384         struct vxlan_fdb f = {
 385                 .state = NUD_STALE,
 386         };
 387         struct vxlan_rdst remote = {
 388                 .remote_ip = *ipa, /* goes to NDA_DST */
 389                 .remote_vni = cpu_to_be32(VXLAN_N_VID),
 390         };
 391
 392         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 393 }
 394
 395 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 396 {
 397         struct vxlan_fdb f = {
 398                 .state = NUD_STALE,
 399         };
 400         struct vxlan_rdst remote = { };
 401
 402         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 403
 404         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 405 }
 406
 407 /* Hash Ethernet address */
 408 static u32 eth_hash(const unsigned char *addr)
 409 {
 410         u64 value = get_unaligned((u64 *)addr);
 411
 412         /* only want 6 bytes */
 413 #ifdef __BIG_ENDIAN
 414         value >>= 16;
 415 #else
 416         value <<= 16;
 417 #endif
 418         return hash_64(value, FDB_HASH_BITS);
 419 }
 420
 421 static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
 422 {
 423         /* use 1 byte of OUI and 3 bytes of NIC */
 424         u32 key = get_unaligned((u32 *)(addr + 2));
 425
 426         return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
 427 }
 428
 429 /* Hash chain to use given mac address */
 430 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 431                                                 const u8 *mac, __be32 vni)
 432 {
 433         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
 434                 return &vxlan->fdb_head[eth_vni_hash(mac, vni)];
 435         else
 436                 return &vxlan->fdb_head[eth_hash(mac)];
 437 }
 438
 439 /* Look up Ethernet address in forwarding table */
 440 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 441                                           const u8 *mac, __be32 vni)
 442 {
 443         struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
 444         struct vxlan_fdb *f;
 445
 446         hlist_for_each_entry_rcu(f, head, hlist) {
 447                 if (ether_addr_equal(mac, f->eth_addr)) {
 448                         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
 449                                 if (vni == f->vni)
 450                                         return f;
 451                         } else {
 452                                 return f;
 453                         }
 454                 }
 455         }
 456
 457         return NULL;
 458 }
 459
 460 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 461                                         const u8 *mac, __be32 vni)
 462 {
 463         struct vxlan_fdb *f;
 464
 465         f = __vxlan_find_mac(vxlan, mac, vni);
 466         if (f)
 467                 f->used = jiffies;
 468
 469         return f;
 470 }
 471
 472 /* caller should hold vxlan->hash_lock */
 473 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 474                                               union vxlan_addr *ip, __be16 port,
 475                                               __be32 vni, __u32 ifindex)
 476 {
 477         struct vxlan_rdst *rd;
 478
 479         list_for_each_entry(rd, &f->remotes, list) {
 480                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 481                     rd->remote_port == port &&
 482                     rd->remote_vni == vni &&
 483                     rd->remote_ifindex == ifindex)
 484                         return rd;
 485         }
 486
 487         return NULL;
 488 }
 489
 490 /* Replace destination of unicast mac */
 491 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 492                              union vxlan_addr *ip, __be16 port, __be32 vni,
 493                              __u32 ifindex)
 494 {
 495         struct vxlan_rdst *rd;
 496
 497         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 498         if (rd)
 499                 return 0;
 500
 501         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 502         if (!rd)
 503                 return 0;
 504
 505         dst_cache_reset(&rd->dst_cache);
 506         rd->remote_ip = *ip;
 507         rd->remote_port = port;
 508         rd->remote_vni = vni;
 509         rd->remote_ifindex = ifindex;
 510         return 1;
 511 }
 512
 513 /* Add/update destinations for multicast */
 514 static int vxlan_fdb_append(struct vxlan_fdb *f,
 515                             union vxlan_addr *ip, __be16 port, __be32 vni,
 516                             __u32 ifindex, struct vxlan_rdst **rdp)
 517 {
 518         struct vxlan_rdst *rd;
 519
 520         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 521         if (rd)
 522                 return 0;
 523
 524         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
 525         if (rd == NULL)
 526                 return -ENOBUFS;
 527
 528         if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
 529                 kfree(rd);
 530                 return -ENOBUFS;
 531         }
 532
 533         rd->remote_ip = *ip;
 534         rd->remote_port = port;
 535         rd->remote_vni = vni;
 536         rd->remote_ifindex = ifindex;
 537
 538         list_add_tail_rcu(&rd->list, &f->remotes);
 539
 540         *rdp = rd;
 541         return 1;
 542 }
 543
 544 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 545                                           unsigned int off,
 546                                           struct vxlanhdr *vh, size_t hdrlen,
 547                                           __be32 vni_field,
 548                                           struct gro_remcsum *grc,
 549                                           bool nopartial)
 550 {
 551         size_t start, offset;
 552
 553         if (skb->remcsum_offload)
 554                 return vh;
 555
 556         if (!NAPI_GRO_CB(skb)->csum_valid)
 557                 return NULL;
 558
 559         start = vxlan_rco_start(vni_field);
 560         offset = start + vxlan_rco_offset(vni_field);
 561
 562         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 563                                      start, offset, grc, nopartial);
 564
 565         skb->remcsum_offload = 1;
 566
 567         return vh;
 568 }
 569
 570 static struct sk_buff **vxlan_gro_receive(struct sock *sk,
 571                                           struct sk_buff **head,
 572                                           struct sk_buff *skb)
 573 {
 574         struct sk_buff *p, **pp = NULL;
 575         struct vxlanhdr *vh, *vh2;
 576         unsigned int hlen, off_vx;
 577         int flush = 1;
 578         struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
 579         __be32 flags;
 580         struct gro_remcsum grc;
 581
 582         skb_gro_remcsum_init(&grc);
 583
 584         off_vx = skb_gro_offset(skb);
 585         hlen = off_vx + sizeof(*vh);
 586         vh   = skb_gro_header_fast(skb, off_vx);
 587         if (skb_gro_header_hard(skb, hlen)) {
 588                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 589                 if (unlikely(!vh))
 590                         goto out;
 591         }
 592
 593         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 594
 595         flags = vh->vx_flags;
 596
 597         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 598                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 599                                        vh->vx_vni, &grc,
 600                                        !!(vs->flags &
 601                                           VXLAN_F_REMCSUM_NOPARTIAL));
 602
 603                 if (!vh)
 604                         goto out;
 605         }
 606
 607         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 608
 609         for (p = *head; p; p = p->next) {
 610                 if (!NAPI_GRO_CB(p)->same_flow)
 611                         continue;
 612
 613                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 614                 if (vh->vx_flags != vh2->vx_flags ||
 615                     vh->vx_vni != vh2->vx_vni) {
 616                         NAPI_GRO_CB(p)->same_flow = 0;
 617                         continue;
 618                 }
 619         }
 620
 621         pp = call_gro_receive(eth_gro_receive, head, skb);
 622         flush = 0;
 623
 624 out:
 625         skb_gro_remcsum_cleanup(skb, &grc);
 626         skb->remcsum_offload = 0;
 627         NAPI_GRO_CB(skb)->flush |= flush;
 628
 629         return pp;
 630 }
 631
 632 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
 633 {
 634         /* Sets 'skb->inner_mac_header' since we are always called with
 635          * 'skb->encapsulation' set.
 636          */
 637         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 638 }
 639
 640 /* Add new entry to forwarding table -- assumes lock held */
 641 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 642                             const u8 *mac, union vxlan_addr *ip,
 643                             __u16 state, __u16 flags,
 644                             __be16 port, __be32 src_vni, __be32 vni,
 645                             __u32 ifindex, __u8 ndm_flags)
 646 {
 647         struct vxlan_rdst *rd = NULL;
 648         struct vxlan_fdb *f;
 649         int notify = 0;
 650         int rc;
 651
 652         f = __vxlan_find_mac(vxlan, mac, src_vni);
 653         if (f) {
 654                 if (flags & NLM_F_EXCL) {
 655                         netdev_dbg(vxlan->dev,
 656                                    "lost race to create %pM\n", mac);
 657                         return -EEXIST;
 658                 }
 659                 if (f->state != state) {
 660                         f->state = state;
 661                         f->updated = jiffies;
 662                         notify = 1;
 663                 }
 664                 if (f->flags != ndm_flags) {
 665                         f->flags = ndm_flags;
 666                         f->updated = jiffies;
 667                         notify = 1;
 668                 }
 669                 if ((flags & NLM_F_REPLACE)) {
 670                         /* Only change unicasts */
 671                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 672                              is_zero_ether_addr(f->eth_addr))) {
 673                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 674                                                            ifindex);
 675                         } else
 676                                 return -EOPNOTSUPP;
 677                 }
 678                 if ((flags & NLM_F_APPEND) &&
 679                     (is_multicast_ether_addr(f->eth_addr) ||
 680                      is_zero_ether_addr(f->eth_addr))) {
 681                         rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 682
 683                         if (rc < 0)
 684                                 return rc;
 685                         notify |= rc;
 686                 }
 687         } else {
 688                 if (!(flags & NLM_F_CREATE))
 689                         return -ENOENT;
 690
 691                 if (vxlan->cfg.addrmax &&
 692                     vxlan->addrcnt >= vxlan->cfg.addrmax)
 693                         return -ENOSPC;
 694
 695                 /* Disallow replace to add a multicast entry */
 696                 if ((flags & NLM_F_REPLACE) &&
 697                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 698                         return -EOPNOTSUPP;
 699
 700                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 701                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 702                 if (!f)
 703                         return -ENOMEM;
 704
 705                 notify = 1;
 706                 f->state = state;
 707                 f->flags = ndm_flags;
 708                 f->updated = f->used = jiffies;
 709                 f->vni = src_vni;
 710                 INIT_LIST_HEAD(&f->remotes);
 711                 memcpy(f->eth_addr, mac, ETH_ALEN);
 712
 713                 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 714                 if (rc < 0) {
 715                         kfree(f);
 716                         return rc;
 717                 }
 718
 719                 ++vxlan->addrcnt;
 720                 hlist_add_head_rcu(&f->hlist,
 721                                    vxlan_fdb_head(vxlan, mac, src_vni));
 722         }
 723
 724         if (notify) {
 725                 if (rd == NULL)
 726                         rd = first_remote_rtnl(f);
 727                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 728         }
 729
 730         return 0;
 731 }
 732
 733 static void vxlan_fdb_free(struct rcu_head *head)
 734 {
 735         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 736         struct vxlan_rdst *rd, *nd;
 737
 738         list_for_each_entry_safe(rd, nd, &f->remotes, list) {
 739                 dst_cache_destroy(&rd->dst_cache);
 740                 kfree(rd);
 741         }
 742         kfree(f);
 743 }
 744
 745 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 746 {
 747         netdev_dbg(vxlan->dev,
 748                     "delete %pM\n", f->eth_addr);
 749
 750         --vxlan->addrcnt;
 751         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 752
 753         hlist_del_rcu(&f->hlist);
 754         call_rcu(&f->rcu, vxlan_fdb_free);
 755 }
 756
 757 static void vxlan_dst_free(struct rcu_head *head)
 758 {
 759         struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
 760
 761         dst_cache_destroy(&rd->dst_cache);
 762         kfree(rd);
 763 }
 764
 765 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
 766                                   struct vxlan_rdst *rd)
 767 {
 768         list_del_rcu(&rd->list);
 769         vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 770         call_rcu(&rd->rcu, vxlan_dst_free);
 771 }
 772
 773 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 774                            union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
 775                            __be32 *vni, u32 *ifindex)
 776 {
 777         struct net *net = dev_net(vxlan->dev);
 778         int err;
 779
 780         if (tb[NDA_DST]) {
 781                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 782                 if (err)
 783                         return err;
 784         } else {
 785                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 786                 if (remote->sa.sa_family == AF_INET) {
 787                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 788                         ip->sa.sa_family = AF_INET;
 789 #if IS_ENABLED(CONFIG_IPV6)
 790                 } else {
 791                         ip->sin6.sin6_addr = in6addr_any;
 792                         ip->sa.sa_family = AF_INET6;
 793 #endif
 794                 }
 795         }
 796
 797         if (tb[NDA_PORT]) {
 798                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 799                         return -EINVAL;
 800                 *port = nla_get_be16(tb[NDA_PORT]);
 801         } else {
 802                 *port = vxlan->cfg.dst_port;
 803         }
 804
 805         if (tb[NDA_VNI]) {
 806                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 807                         return -EINVAL;
 808                 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
 809         } else {
 810                 *vni = vxlan->default_dst.remote_vni;
 811         }
 812
 813         if (tb[NDA_SRC_VNI]) {
 814                 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
 815                         return -EINVAL;
 816                 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
 817         } else {
 818                 *src_vni = vxlan->default_dst.remote_vni;
 819         }
 820
 821         if (tb[NDA_IFINDEX]) {
 822                 struct net_device *tdev;
 823
 824                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 825                         return -EINVAL;
 826                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 827                 tdev = __dev_get_by_index(net, *ifindex);
 828                 if (!tdev)
 829                         return -EADDRNOTAVAIL;
 830         } else {
 831                 *ifindex = 0;
 832         }
 833
 834         return 0;
 835 }
 836
 837 /* Add static entry (via netlink) */
 838 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 839                          struct net_device *dev,
 840                          const unsigned char *addr, u16 vid, u16 flags)
 841 {
 842         struct vxlan_dev *vxlan = netdev_priv(dev);
 843         /* struct net *net = dev_net(vxlan->dev); */
 844         union vxlan_addr ip;
 845         __be16 port;
 846         __be32 src_vni, vni;
 847         u32 ifindex;
 848         int err;
 849
 850         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 851                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 852                         ndm->ndm_state);
 853                 return -EINVAL;
 854         }
 855
 856         if (tb[NDA_DST] == NULL)
 857                 return -EINVAL;
 858
 859         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
 860         if (err)
 861                 return err;
 862
 863         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 864                 return -EAFNOSUPPORT;
 865
 866         spin_lock_bh(&vxlan->hash_lock);
 867         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 868                                port, src_vni, vni, ifindex, ndm->ndm_flags);
 869         spin_unlock_bh(&vxlan->hash_lock);
 870
 871         return err;
 872 }
 873
 874 static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
 875                               const unsigned char *addr, union vxlan_addr ip,
 876                               __be16 port, __be32 src_vni, u32 vni, u32 ifindex,
 877                               u16 vid)
 878 {
 879         struct vxlan_fdb *f;
 880         struct vxlan_rdst *rd = NULL;
 881         int err = -ENOENT;
 882
 883         f = vxlan_find_mac(vxlan, addr, src_vni);
 884         if (!f)
 885                 return err;
 886
 887         if (!vxlan_addr_any(&ip)) {
 888                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 889                 if (!rd)
 890                         goto out;
 891         }
 892
 893         /* remove a destination if it's not the only one on the list,
 894          * otherwise destroy the fdb entry
 895          */
 896         if (rd && !list_is_singular(&f->remotes)) {
 897                 vxlan_fdb_dst_destroy(vxlan, f, rd);
 898                 goto out;
 899         }
 900
 901         vxlan_fdb_destroy(vxlan, f);
 902
 903 out:
 904         return 0;
 905 }
 906
 907 /* Delete entry (via netlink) */
 908 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 909                             struct net_device *dev,
 910                             const unsigned char *addr, u16 vid)
 911 {
 912         struct vxlan_dev *vxlan = netdev_priv(dev);
 913         union vxlan_addr ip;
 914         __be32 src_vni, vni;
 915         __be16 port;
 916         u32 ifindex;
 917         int err;
 918
 919         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex);
 920         if (err)
 921                 return err;
 922
 923         spin_lock_bh(&vxlan->hash_lock);
 924         err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
 925                                  vid);
 926         spin_unlock_bh(&vxlan->hash_lock);
 927
 928         return err;
 929 }
 930
 931 /* Dump forwarding table */
 932 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 933                           struct net_device *dev,
 934                           struct net_device *filter_dev, int *idx)
 935 {
 936         struct vxlan_dev *vxlan = netdev_priv(dev);
 937         unsigned int h;
 938         int err = 0;
 939
 940         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 941                 struct vxlan_fdb *f;
 942
 943                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 944                         struct vxlan_rdst *rd;
 945
 946                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 947                                 if (*idx < cb->args[2])
 948                                         goto skip;
 949
 950                                 err = vxlan_fdb_info(skb, vxlan, f,
 951                                                      NETLINK_CB(cb->skb).portid,
 952                                                      cb->nlh->nlmsg_seq,
 953                                                      RTM_NEWNEIGH,
 954                                                      NLM_F_MULTI, rd);
 955                                 if (err < 0)
 956                                         goto out;
 957 skip:
 958                                 *idx += 1;
 959                         }
 960                 }
 961         }
 962 out:
 963         return err;
 964 }
 965
 966 /* Watch incoming packets to learn mapping between Ethernet address
 967  * and Tunnel endpoint.
 968  * Return true if packet is bogus and should be dropped.
 969  */
 970 static bool vxlan_snoop(struct net_device *dev,
 971                         union vxlan_addr *src_ip, const u8 *src_mac,
 972                         u32 src_ifindex, __be32 vni)
 973 {
 974         struct vxlan_dev *vxlan = netdev_priv(dev);
 975         struct vxlan_fdb *f;
 976         u32 ifindex = 0;
 977
 978 #if IS_ENABLED(CONFIG_IPV6)
 979         if (src_ip->sa.sa_family == AF_INET6 &&
 980             (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
 981                 ifindex = src_ifindex;
 982 #endif
 983
 984         f = vxlan_find_mac(vxlan, src_mac, vni);
 985         if (likely(f)) {
 986                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 987
 988                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
 989                            rdst->remote_ifindex == ifindex))
 990                         return false;
 991
 992                 /* Don't migrate static entries, drop packets */
 993                 if (f->state & (NUD_PERMANENT | NUD_NOARP))
 994                         return true;
 995
 996                 if (net_ratelimit())
 997                         netdev_info(dev,
 998                                     "%pM migrated from %pIS to %pIS\n",
 999                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
1000
1001                 rdst->remote_ip = *src_ip;
1002                 f->updated = jiffies;
1003                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
1004         } else {
1005                 /* learned new entry */
1006                 spin_lock(&vxlan->hash_lock);
1007
1008                 /* close off race between vxlan_flush and incoming packets */
1009                 if (netif_running(dev))
1010                         vxlan_fdb_create(vxlan, src_mac, src_ip,
1011                                          NUD_REACHABLE,
1012                                          NLM_F_EXCL|NLM_F_CREATE,
1013                                          vxlan->cfg.dst_port,
1014                                          vni,
1015                                          vxlan->default_dst.remote_vni,
1016                                          ifindex, NTF_SELF);
1017                 spin_unlock(&vxlan->hash_lock);
1018         }
1019
1020         return false;
1021 }
1022
1023 /* See if multicast group is already in use by other ID */
1024 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
1025 {
1026         struct vxlan_dev *vxlan;
1027         struct vxlan_sock *sock4;
1028 #if IS_ENABLED(CONFIG_IPV6)
1029         struct vxlan_sock *sock6;
1030 #endif
1031         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
1032
1033         sock4 = rtnl_dereference(dev->vn4_sock);
1034
1035         /* The vxlan_sock is only used by dev, leaving group has
1036          * no effect on other vxlan devices.
1037          */
1038         if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
1039                 return false;
1040 #if IS_ENABLED(CONFIG_IPV6)
1041         sock6 = rtnl_dereference(dev->vn6_sock);
1042         if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
1043                 return false;
1044 #endif
1045
1046         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1047                 if (!netif_running(vxlan->dev) || vxlan == dev)
1048                         continue;
1049
1050                 if (family == AF_INET &&
1051                     rtnl_dereference(vxlan->vn4_sock) != sock4)
1052                         continue;
1053 #if IS_ENABLED(CONFIG_IPV6)
1054                 if (family == AF_INET6 &&
1055                     rtnl_dereference(vxlan->vn6_sock) != sock6)
1056                         continue;
1057 #endif
1058
1059                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1060                                       &dev->default_dst.remote_ip))
1061                         continue;
1062
1063                 if (vxlan->default_dst.remote_ifindex !=
1064                     dev->default_dst.remote_ifindex)
1065                         continue;
1066
1067                 return true;
1068         }
1069
1070         return false;
1071 }
1072
1073 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
1074 {
1075         struct vxlan_net *vn;
1076
1077         if (!vs)
1078                 return false;
1079         if (!refcount_dec_and_test(&vs->refcnt))
1080                 return false;
1081
1082         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1083         spin_lock(&vn->sock_lock);
1084         hlist_del_rcu(&vs->hlist);
1085         udp_tunnel_notify_del_rx_port(vs->sock,
1086                                       (vs->flags & VXLAN_F_GPE) ?
1087                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
1088                                       UDP_TUNNEL_TYPE_VXLAN);
1089         spin_unlock(&vn->sock_lock);
1090
1091         return true;
1092 }
1093
1094 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1095 {
1096         struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1097 #if IS_ENABLED(CONFIG_IPV6)
1098         struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1099
1100         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
1101 #endif
1102
1103         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
1104         synchronize_net();
1105
1106         vxlan_vs_del_dev(vxlan);
1107
1108         if (__vxlan_sock_release_prep(sock4)) {
1109                 udp_tunnel_sock_release(sock4->sock);
1110                 kfree(sock4);
1111         }
1112
1113 #if IS_ENABLED(CONFIG_IPV6)
1114         if (__vxlan_sock_release_prep(sock6)) {
1115                 udp_tunnel_sock_release(sock6->sock);
1116                 kfree(sock6);
1117         }
1118 #endif
1119 }
1120
1121 /* Update multicast group membership when first VNI on
1122  * multicast address is brought up
1123  */
1124 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1125 {
1126         struct sock *sk;
1127         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1128         int ifindex = vxlan->default_dst.remote_ifindex;
1129         int ret = -EINVAL;
1130
1131         if (ip->sa.sa_family == AF_INET) {
1132                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1133                 struct ip_mreqn mreq = {
1134                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1135                         .imr_ifindex            = ifindex,
1136                 };
1137
1138                 sk = sock4->sock->sk;
1139                 lock_sock(sk);
1140                 ret = ip_mc_join_group(sk, &mreq);
1141                 release_sock(sk);
1142 #if IS_ENABLED(CONFIG_IPV6)
1143         } else {
1144                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1145
1146                 sk = sock6->sock->sk;
1147                 lock_sock(sk);
1148                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1149                                                    &ip->sin6.sin6_addr);
1150                 release_sock(sk);
1151 #endif
1152         }
1153
1154         return ret;
1155 }
1156
1157 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1158 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1159 {
1160         struct sock *sk;
1161         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1162         int ifindex = vxlan->default_dst.remote_ifindex;
1163         int ret = -EINVAL;
1164
1165         if (ip->sa.sa_family == AF_INET) {
1166                 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
1167                 struct ip_mreqn mreq = {
1168                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1169                         .imr_ifindex            = ifindex,
1170                 };
1171
1172                 sk = sock4->sock->sk;
1173                 lock_sock(sk);
1174                 ret = ip_mc_leave_group(sk, &mreq);
1175                 release_sock(sk);
1176 #if IS_ENABLED(CONFIG_IPV6)
1177         } else {
1178                 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
1179
1180                 sk = sock6->sock->sk;
1181                 lock_sock(sk);
1182                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1183                                                    &ip->sin6.sin6_addr);
1184                 release_sock(sk);
1185 #endif
1186         }
1187
1188         return ret;
1189 }
1190
1191 static bool vxlan_remcsum(struct vxlanhdr *unparsed,
1192                           struct sk_buff *skb, u32 vxflags)
1193 {
1194         size_t start, offset;
1195
1196         if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
1197                 goto out;
1198
1199         start = vxlan_rco_start(unparsed->vx_vni);
1200         offset = start + vxlan_rco_offset(unparsed->vx_vni);
1201
1202         if (!pskb_may_pull(skb, offset + sizeof(u16)))
1203                 return false;
1204
1205         skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
1206                             !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
1207 out:
1208         unparsed->vx_flags &= ~VXLAN_HF_RCO;
1209         unparsed->vx_vni &= VXLAN_VNI_MASK;
1210         return true;
1211 }
1212
1213 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
1214                                 struct sk_buff *skb, u32 vxflags,
1215                                 struct vxlan_metadata *md)
1216 {
1217         struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
1218         struct metadata_dst *tun_dst;
1219
1220         if (!(unparsed->vx_flags & VXLAN_HF_GBP))
1221                 goto out;
1222
1223         md->gbp = ntohs(gbp->policy_id);
1224
1225         tun_dst = (struct metadata_dst *)skb_dst(skb);
1226         if (tun_dst) {
1227                 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1228                 tun_dst->u.tun_info.options_len = sizeof(*md);
1229         }
1230         if (gbp->dont_learn)
1231                 md->gbp |= VXLAN_GBP_DONT_LEARN;
1232
1233         if (gbp->policy_applied)
1234                 md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1235
1236         /* In flow-based mode, GBP is carried in dst_metadata */
1237         if (!(vxflags & VXLAN_F_COLLECT_METADATA))
1238                 skb->mark = md->gbp;
1239 out:
1240         unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
1241 }
1242
1243 static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
1244                                 __be16 *protocol,
1245                                 struct sk_buff *skb, u32 vxflags)
1246 {
1247         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
1248
1249         /* Need to have Next Protocol set for interfaces in GPE mode. */
1250         if (!gpe->np_applied)
1251                 return false;
1252         /* "The initial version is 0. If a receiver does not support the
1253          * version indicated it MUST drop the packet.
1254          */
1255         if (gpe->version != 0)
1256                 return false;
1257         /* "When the O bit is set to 1, the packet is an OAM packet and OAM
1258          * processing MUST occur." However, we don't implement OAM
1259          * processing, thus drop the packet.
1260          */
1261         if (gpe->oam_flag)
1262                 return false;
1263
1264         switch (gpe->next_protocol) {
1265         case VXLAN_GPE_NP_IPV4:
1266                 *protocol = htons(ETH_P_IP);
1267                 break;
1268         case VXLAN_GPE_NP_IPV6:
1269                 *protocol = htons(ETH_P_IPV6);
1270                 break;
1271         case VXLAN_GPE_NP_ETHERNET:
1272                 *protocol = htons(ETH_P_TEB);
1273                 break;
1274         default:
1275                 return false;
1276         }
1277
1278         unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
1279         return true;
1280 }
1281
1282 static bool vxlan_set_mac(struct vxlan_dev *vxlan,
1283                           struct vxlan_sock *vs,
1284                           struct sk_buff *skb, __be32 vni)
1285 {
1286         union vxlan_addr saddr;
1287         u32 ifindex = skb->dev->ifindex;
1288
1289         skb_reset_mac_header(skb);
1290         skb->protocol = eth_type_trans(skb, vxlan->dev);
1291         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1292
1293         /* Ignore packet loops (and multicast echo) */
1294         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1295                 return false;
1296
1297         /* Get address from the outer IP header */
1298         if (vxlan_get_sk_family(vs) == AF_INET) {
1299                 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
1300                 saddr.sa.sa_family = AF_INET;
1301 #if IS_ENABLED(CONFIG_IPV6)
1302         } else {
1303                 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
1304                 saddr.sa.sa_family = AF_INET6;
1305 #endif
1306         }
1307
1308         if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
1309             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
1310                 return false;
1311
1312         return true;
1313 }
1314
1315 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
1316                                   struct sk_buff *skb)
1317 {
1318         int err = 0;
1319
1320         if (vxlan_get_sk_family(vs) == AF_INET)
1321                 err = IP_ECN_decapsulate(oiph, skb);
1322 #if IS_ENABLED(CONFIG_IPV6)
1323         else
1324                 err = IP6_ECN_decapsulate(oiph, skb);
1325 #endif
1326
1327         if (unlikely(err) && log_ecn_error) {
1328                 if (vxlan_get_sk_family(vs) == AF_INET)
1329                         net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1330                                              &((struct iphdr *)oiph)->saddr,
1331                                              ((struct iphdr *)oiph)->tos);
1332                 else
1333                         net_info_ratelimited("non-ECT from %pI6\n",
1334                                              &((struct ipv6hdr *)oiph)->saddr);
1335         }
1336         return err <= 1;
1337 }
1338
1339 /* Callback from net/ipv4/udp.c to receive packets */
1340 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
1341 {
1342         struct pcpu_sw_netstats *stats;
1343         struct vxlan_dev *vxlan;
1344         struct vxlan_sock *vs;
1345         struct vxlanhdr unparsed;
1346         struct vxlan_metadata _md;
1347         struct vxlan_metadata *md = &_md;
1348         __be16 protocol = htons(ETH_P_TEB);
1349         bool raw_proto = false;
1350         void *oiph;
1351         __be32 vni = 0;
1352
1353         /* Need UDP and VXLAN header to be present */
1354         if (!pskb_may_pull(skb, VXLAN_HLEN))
1355                 goto drop;
1356
1357         unparsed = *vxlan_hdr(skb);
1358         /* VNI flag always required to be set */
1359         if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
1360                 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1361                            ntohl(vxlan_hdr(skb)->vx_flags),
1362                            ntohl(vxlan_hdr(skb)->vx_vni));
1363                 /* Return non vxlan pkt */
1364                 goto drop;
1365         }
1366         unparsed.vx_flags &= ~VXLAN_HF_VNI;
1367         unparsed.vx_vni &= ~VXLAN_VNI_MASK;
1368
1369         vs = rcu_dereference_sk_user_data(sk);
1370         if (!vs)
1371                 goto drop;
1372
1373         vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
1374
1375         vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
1376         if (!vxlan)
1377                 goto drop;
1378
1379         /* For backwards compatibility, only allow reserved fields to be
1380          * used by VXLAN extensions if explicitly requested.
1381          */
1382         if (vs->flags & VXLAN_F_GPE) {
1383                 if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
1384                         goto drop;
1385                 raw_proto = true;
1386         }
1387
1388         if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
1389                                    !net_eq(vxlan->net, dev_net(vxlan->dev))))
1390                         goto drop;
1391
1392         if (vxlan_collect_metadata(vs)) {
1393                 struct metadata_dst *tun_dst;
1394
1395                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1396                                          key32_to_tunnel_id(vni), sizeof(*md));
1397
1398                 if (!tun_dst)
1399                         goto drop;
1400
1401                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1402
1403                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1404         } else {
1405                 memset(md, 0, sizeof(*md));
1406         }
1407
1408         if (vs->flags & VXLAN_F_REMCSUM_RX)
1409                 if (!vxlan_remcsum(&unparsed, skb, vs->flags))
1410                         goto drop;
1411         if (vs->flags & VXLAN_F_GBP)
1412                 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
1413         /* Note that GBP and GPE can never be active together. This is
1414          * ensured in vxlan_dev_configure.
1415          */
1416
1417         if (unparsed.vx_flags || unparsed.vx_vni) {
1418                 /* If there are any unprocessed flags remaining treat
1419                  * this as a malformed packet. This behavior diverges from
1420                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1421                  * in reserved fields are to be ignored. The approach here
1422                  * maintains compatibility with previous stack code, and also
1423                  * is more robust and provides a little more security in
1424                  * adding extensions to VXLAN.
1425                  */
1426                 goto drop;
1427         }
1428
1429         if (!raw_proto) {
1430                 if (!vxlan_set_mac(vxlan, vs, skb, vni))
1431                         goto drop;
1432         } else {
1433                 skb_reset_mac_header(skb);
1434                 skb->dev = vxlan->dev;
1435                 skb->pkt_type = PACKET_HOST;
1436         }
1437
1438         oiph = skb_network_header(skb);
1439         skb_reset_network_header(skb);
1440
1441         if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
1442                 ++vxlan->dev->stats.rx_frame_errors;
1443                 ++vxlan->dev->stats.rx_errors;
1444                 goto drop;
1445         }
1446
1447         stats = this_cpu_ptr(vxlan->dev->tstats);
1448         u64_stats_update_begin(&stats->syncp);
1449         stats->rx_packets++;
1450         stats->rx_bytes += skb->len;
1451         u64_stats_update_end(&stats->syncp);
1452
1453         gro_cells_receive(&vxlan->gro_cells, skb);
1454         return 0;
1455
1456 drop:
1457         /* Consume bad packet */
1458         kfree_skb(skb);
1459         return 0;
1460 }
1461
1462 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1463 {
1464         struct vxlan_dev *vxlan = netdev_priv(dev);
1465         struct arphdr *parp;
1466         u8 *arpptr, *sha;
1467         __be32 sip, tip;
1468         struct neighbour *n;
1469
1470         if (dev->flags & IFF_NOARP)
1471                 goto out;
1472
1473         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1474                 dev->stats.tx_dropped++;
1475                 goto out;
1476         }
1477         parp = arp_hdr(skb);
1478
1479         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1480              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1481             parp->ar_pro != htons(ETH_P_IP) ||
1482             parp->ar_op != htons(ARPOP_REQUEST) ||
1483             parp->ar_hln != dev->addr_len ||
1484             parp->ar_pln != 4)
1485                 goto out;
1486         arpptr = (u8 *)parp + sizeof(struct arphdr);
1487         sha = arpptr;
1488         arpptr += dev->addr_len;        /* sha */
1489         memcpy(&sip, arpptr, sizeof(sip));
1490         arpptr += sizeof(sip);
1491         arpptr += dev->addr_len;        /* tha */
1492         memcpy(&tip, arpptr, sizeof(tip));
1493
1494         if (ipv4_is_loopback(tip) ||
1495             ipv4_is_multicast(tip))
1496                 goto out;
1497
1498         n = neigh_lookup(&arp_tbl, &tip, dev);
1499
1500         if (n) {
1501                 struct vxlan_fdb *f;
1502                 struct sk_buff  *reply;
1503
1504                 if (!(n->nud_state & NUD_CONNECTED)) {
1505                         neigh_release(n);
1506                         goto out;
1507                 }
1508
1509                 f = vxlan_find_mac(vxlan, n->ha, vni);
1510                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1511                         /* bridge-local neighbor */
1512                         neigh_release(n);
1513                         goto out;
1514                 }
1515
1516                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1517                                 n->ha, sha);
1518
1519                 neigh_release(n);
1520
1521                 if (reply == NULL)
1522                         goto out;
1523
1524                 skb_reset_mac_header(reply);
1525                 __skb_pull(reply, skb_network_offset(reply));
1526                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1527                 reply->pkt_type = PACKET_HOST;
1528
1529                 if (netif_rx_ni(reply) == NET_RX_DROP)
1530                         dev->stats.rx_dropped++;
1531         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1532                 union vxlan_addr ipa = {
1533                         .sin.sin_addr.s_addr = tip,
1534                         .sin.sin_family = AF_INET,
1535                 };
1536
1537                 vxlan_ip_miss(dev, &ipa);
1538         }
1539 out:
1540         consume_skb(skb);
1541         return NETDEV_TX_OK;
1542 }
1543
1544 #if IS_ENABLED(CONFIG_IPV6)
1545 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1546         struct neighbour *n, bool isrouter)
1547 {
1548         struct net_device *dev = request->dev;
1549         struct sk_buff *reply;
1550         struct nd_msg *ns, *na;
1551         struct ipv6hdr *pip6;
1552         u8 *daddr;
1553         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1554         int ns_olen;
1555         int i, len;
1556
1557         if (dev == NULL || !pskb_may_pull(request, request->len))
1558                 return NULL;
1559
1560         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1561                 sizeof(*na) + na_olen + dev->needed_tailroom;
1562         reply = alloc_skb(len, GFP_ATOMIC);
1563         if (reply == NULL)
1564                 return NULL;
1565
1566         reply->protocol = htons(ETH_P_IPV6);
1567         reply->dev = dev;
1568         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1569         skb_push(reply, sizeof(struct ethhdr));
1570         skb_reset_mac_header(reply);
1571
1572         ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
1573
1574         daddr = eth_hdr(request)->h_source;
1575         ns_olen = request->len - skb_network_offset(request) -
1576                 sizeof(struct ipv6hdr) - sizeof(*ns);
1577         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1578                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1579                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1580                         break;
1581                 }
1582         }
1583
1584         /* Ethernet header */
1585         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1586         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1587         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1588         reply->protocol = htons(ETH_P_IPV6);
1589
1590         skb_pull(reply, sizeof(struct ethhdr));
1591         skb_reset_network_header(reply);
1592         skb_put(reply, sizeof(struct ipv6hdr));
1593
1594         /* IPv6 header */
1595
1596         pip6 = ipv6_hdr(reply);
1597         memset(pip6, 0, sizeof(struct ipv6hdr));
1598         pip6->version = 6;
1599         pip6->priority = ipv6_hdr(request)->priority;
1600         pip6->nexthdr = IPPROTO_ICMPV6;
1601         pip6->hop_limit = 255;
1602         pip6->daddr = ipv6_hdr(request)->saddr;
1603         pip6->saddr = *(struct in6_addr *)n->primary_key;
1604
1605         skb_pull(reply, sizeof(struct ipv6hdr));
1606         skb_reset_transport_header(reply);
1607
1608         /* Neighbor Advertisement */
1609         na = skb_put_zero(reply, sizeof(*na) + na_olen);
1610         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1611         na->icmph.icmp6_router = isrouter;
1612         na->icmph.icmp6_override = 1;
1613         na->icmph.icmp6_solicited = 1;
1614         na->target = ns->target;
1615         ether_addr_copy(&na->opt[2], n->ha);
1616         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1617         na->opt[1] = na_olen >> 3;
1618
1619         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1620                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1621                 csum_partial(na, sizeof(*na)+na_olen, 0));
1622
1623         pip6->payload_len = htons(sizeof(*na)+na_olen);
1624
1625         skb_push(reply, sizeof(struct ipv6hdr));
1626
1627         reply->ip_summed = CHECKSUM_UNNECESSARY;
1628
1629         return reply;
1630 }
1631
1632 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
1633 {
1634         struct vxlan_dev *vxlan = netdev_priv(dev);
1635         struct nd_msg *msg;
1636         const struct ipv6hdr *iphdr;
1637         const struct in6_addr *daddr;
1638         struct neighbour *n;
1639         struct inet6_dev *in6_dev;
1640
1641         in6_dev = __in6_dev_get(dev);
1642         if (!in6_dev)
1643                 goto out;
1644
1645         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + sizeof(struct nd_msg)))
1646                 goto out;
1647
1648         iphdr = ipv6_hdr(skb);
1649         daddr = &iphdr->daddr;
1650
1651         msg = (struct nd_msg *)(iphdr + 1);
1652         if (msg->icmph.icmp6_code != 0 ||
1653             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1654                 goto out;
1655
1656         if (ipv6_addr_loopback(daddr) ||
1657             ipv6_addr_is_multicast(&msg->target))
1658                 goto out;
1659
1660         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1661
1662         if (n) {
1663                 struct vxlan_fdb *f;
1664                 struct sk_buff *reply;
1665
1666                 if (!(n->nud_state & NUD_CONNECTED)) {
1667                         neigh_release(n);
1668                         goto out;
1669                 }
1670
1671                 f = vxlan_find_mac(vxlan, n->ha, vni);
1672                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1673                         /* bridge-local neighbor */
1674                         neigh_release(n);
1675                         goto out;
1676                 }
1677
1678                 reply = vxlan_na_create(skb, n,
1679                                         !!(f ? f->flags & NTF_ROUTER : 0));
1680
1681                 neigh_release(n);
1682
1683                 if (reply == NULL)
1684                         goto out;
1685
1686                 if (netif_rx_ni(reply) == NET_RX_DROP)
1687                         dev->stats.rx_dropped++;
1688
1689         } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
1690                 union vxlan_addr ipa = {
1691                         .sin6.sin6_addr = msg->target,
1692                         .sin6.sin6_family = AF_INET6,
1693                 };
1694
1695                 vxlan_ip_miss(dev, &ipa);
1696         }
1697
1698 out:
1699         consume_skb(skb);
1700         return NETDEV_TX_OK;
1701 }
1702 #endif
1703
1704 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1705 {
1706         struct vxlan_dev *vxlan = netdev_priv(dev);
1707         struct neighbour *n;
1708
1709         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1710                 return false;
1711
1712         n = NULL;
1713         switch (ntohs(eth_hdr(skb)->h_proto)) {
1714         case ETH_P_IP:
1715         {
1716                 struct iphdr *pip;
1717
1718                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1719                         return false;
1720                 pip = ip_hdr(skb);
1721                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1722                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1723                         union vxlan_addr ipa = {
1724                                 .sin.sin_addr.s_addr = pip->daddr,
1725                                 .sin.sin_family = AF_INET,
1726                         };
1727
1728                         vxlan_ip_miss(dev, &ipa);
1729                         return false;
1730                 }
1731
1732                 break;
1733         }
1734 #if IS_ENABLED(CONFIG_IPV6)
1735         case ETH_P_IPV6:
1736         {
1737                 struct ipv6hdr *pip6;
1738
1739                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1740                         return false;
1741                 pip6 = ipv6_hdr(skb);
1742                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1743                 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
1744                         union vxlan_addr ipa = {
1745                                 .sin6.sin6_addr = pip6->daddr,
1746                                 .sin6.sin6_family = AF_INET6,
1747                         };
1748
1749                         vxlan_ip_miss(dev, &ipa);
1750                         return false;
1751                 }
1752
1753                 break;
1754         }
1755 #endif
1756         default:
1757                 return false;
1758         }
1759
1760         if (n) {
1761                 bool diff;
1762
1763                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1764                 if (diff) {
1765                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1766                                 dev->addr_len);
1767                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1768                 }
1769                 neigh_release(n);
1770                 return diff;
1771         }
1772
1773         return false;
1774 }
1775
1776 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1777                                 struct vxlan_metadata *md)
1778 {
1779         struct vxlanhdr_gbp *gbp;
1780
1781         if (!md->gbp)
1782                 return;
1783
1784         gbp = (struct vxlanhdr_gbp *)vxh;
1785         vxh->vx_flags |= VXLAN_HF_GBP;
1786
1787         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1788                 gbp->dont_learn = 1;
1789
1790         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1791                 gbp->policy_applied = 1;
1792
1793         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1794 }
1795
1796 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
1797                                __be16 protocol)
1798 {
1799         struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
1800
1801         gpe->np_applied = 1;
1802
1803         switch (protocol) {
1804         case htons(ETH_P_IP):
1805                 gpe->next_protocol = VXLAN_GPE_NP_IPV4;
1806                 return 0;
1807         case htons(ETH_P_IPV6):
1808                 gpe->next_protocol = VXLAN_GPE_NP_IPV6;
1809                 return 0;
1810         case htons(ETH_P_TEB):
1811                 gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
1812                 return 0;
1813         }
1814         return -EPFNOSUPPORT;
1815 }
1816
1817 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
1818                            int iphdr_len, __be32 vni,
1819                            struct vxlan_metadata *md, u32 vxflags,
1820                            bool udp_sum)
1821 {
1822         struct vxlanhdr *vxh;
1823         int min_headroom;
1824         int err;
1825         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1826         __be16 inner_protocol = htons(ETH_P_TEB);
1827
1828         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1829             skb->ip_summed == CHECKSUM_PARTIAL) {
1830                 int csum_start = skb_checksum_start_offset(skb);
1831
1832                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1833                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1834                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1835                      skb->csum_offset == offsetof(struct tcphdr, check)))
1836                         type |= SKB_GSO_TUNNEL_REMCSUM;
1837         }
1838
1839         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1840                         + VXLAN_HLEN + iphdr_len;
1841
1842         /* Need space for new headers (invalidates iph ptr) */
1843         err = skb_cow_head(skb, min_headroom);
1844         if (unlikely(err))
1845                 return err;
1846
1847         err = iptunnel_handle_offloads(skb, type);
1848         if (err)
1849                 return err;
1850
1851         vxh = __skb_push(skb, sizeof(*vxh));
1852         vxh->vx_flags = VXLAN_HF_VNI;
1853         vxh->vx_vni = vxlan_vni_field(vni);
1854
1855         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1856                 unsigned int start;
1857
1858                 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
1859                 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
1860                 vxh->vx_flags |= VXLAN_HF_RCO;
1861
1862                 if (!skb_is_gso(skb)) {
1863                         skb->ip_summed = CHECKSUM_NONE;
1864                         skb->encapsulation = 0;
1865                 }
1866         }
1867
1868         if (vxflags & VXLAN_F_GBP)
1869                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1870         if (vxflags & VXLAN_F_GPE) {
1871                 err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
1872                 if (err < 0)
1873                         return err;
1874                 inner_protocol = skb->protocol;
1875         }
1876
1877         skb_set_inner_protocol(skb, inner_protocol);
1878         return 0;
1879 }
1880
1881 static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
1882                                       struct vxlan_sock *sock4,
1883                                       struct sk_buff *skb, int oif, u8 tos,
1884                                       __be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
1885                                       struct dst_cache *dst_cache,
1886                                       const struct ip_tunnel_info *info)
1887 {
1888         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1889         struct rtable *rt = NULL;
1890         struct flowi4 fl4;
1891
1892         if (!sock4)
1893                 return ERR_PTR(-EIO);
1894
1895         if (tos && !info)
1896                 use_cache = false;
1897         if (use_cache) {
1898                 rt = dst_cache_get_ip4(dst_cache, saddr);
1899                 if (rt)
1900                         return rt;
1901         }
1902
1903         memset(&fl4, 0, sizeof(fl4));
1904         fl4.flowi4_oif = oif;
1905         fl4.flowi4_tos = RT_TOS(tos);
1906         fl4.flowi4_mark = skb->mark;
1907         fl4.flowi4_proto = IPPROTO_UDP;
1908         fl4.daddr = daddr;
1909         fl4.saddr = *saddr;
1910         fl4.fl4_dport = dport;
1911         fl4.fl4_sport = sport;
1912
1913         rt = ip_route_output_key(vxlan->net, &fl4);
1914         if (likely(!IS_ERR(rt))) {
1915                 if (rt->dst.dev == dev) {
1916                         netdev_dbg(dev, "circular route to %pI4\n", &daddr);
1917                         ip_rt_put(rt);
1918                         return ERR_PTR(-ELOOP);
1919                 }
1920
1921                 *saddr = fl4.saddr;
1922                 if (use_cache)
1923                         dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
1924         } else {
1925                 netdev_dbg(dev, "no route to %pI4\n", &daddr);
1926                 return ERR_PTR(-ENETUNREACH);
1927         }
1928         return rt;
1929 }
1930
1931 #if IS_ENABLED(CONFIG_IPV6)
1932 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1933                                           struct net_device *dev,
1934                                           struct vxlan_sock *sock6,
1935                                           struct sk_buff *skb, int oif, u8 tos,
1936                                           __be32 label,
1937                                           const struct in6_addr *daddr,
1938                                           struct in6_addr *saddr,
1939                                           __be16 dport, __be16 sport,
1940                                           struct dst_cache *dst_cache,
1941                                           const struct ip_tunnel_info *info)
1942 {
1943         bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
1944         struct dst_entry *ndst;
1945         struct flowi6 fl6;
1946         int err;
1947
1948         if (!sock6)
1949                 return ERR_PTR(-EIO);
1950
1951         if (tos && !info)
1952                 use_cache = false;
1953         if (use_cache) {
1954                 ndst = dst_cache_get_ip6(dst_cache, saddr);
1955                 if (ndst)
1956                         return ndst;
1957         }
1958
1959         memset(&fl6, 0, sizeof(fl6));
1960         fl6.flowi6_oif = oif;
1961         fl6.daddr = *daddr;
1962         fl6.saddr = *saddr;
1963         fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
1964         fl6.flowi6_mark = skb->mark;
1965         fl6.flowi6_proto = IPPROTO_UDP;
1966         fl6.fl6_dport = dport;
1967         fl6.fl6_sport = sport;
1968
1969         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1970                                          sock6->sock->sk,
1971                                          &ndst, &fl6);
1972         if (unlikely(err < 0)) {
1973                 netdev_dbg(dev, "no route to %pI6\n", daddr);
1974                 return ERR_PTR(-ENETUNREACH);
1975         }
1976
1977         if (unlikely(ndst->dev == dev)) {
1978                 netdev_dbg(dev, "circular route to %pI6\n", daddr);
1979                 dst_release(ndst);
1980                 return ERR_PTR(-ELOOP);
1981         }
1982
1983         *saddr = fl6.saddr;
1984         if (use_cache)
1985                 dst_cache_set_ip6(dst_cache, ndst, saddr);
1986         return ndst;
1987 }
1988 #endif
1989
1990 /* Bypass encapsulation if the destination is local */
1991 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1992                                struct vxlan_dev *dst_vxlan, __be32 vni)
1993 {
1994         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1995         union vxlan_addr loopback;
1996         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1997         struct net_device *dev = skb->dev;
1998         int len = skb->len;
1999
2000         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
2001         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
2002         skb->pkt_type = PACKET_HOST;
2003         skb->encapsulation = 0;
2004         skb->dev = dst_vxlan->dev;
2005         __skb_pull(skb, skb_network_offset(skb));
2006
2007         if (remote_ip->sa.sa_family == AF_INET) {
2008                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2009                 loopback.sa.sa_family =  AF_INET;
2010 #if IS_ENABLED(CONFIG_IPV6)
2011         } else {
2012                 loopback.sin6.sin6_addr = in6addr_loopback;
2013                 loopback.sa.sa_family =  AF_INET6;
2014 #endif
2015         }
2016
2017         if (dst_vxlan->cfg.flags & VXLAN_F_LEARN)
2018                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source, 0,
2019                             vni);
2020
2021         u64_stats_update_begin(&tx_stats->syncp);
2022         tx_stats->tx_packets++;
2023         tx_stats->tx_bytes += len;
2024         u64_stats_update_end(&tx_stats->syncp);
2025
2026         if (netif_rx(skb) == NET_RX_SUCCESS) {
2027                 u64_stats_update_begin(&rx_stats->syncp);
2028                 rx_stats->rx_packets++;
2029                 rx_stats->rx_bytes += len;
2030                 u64_stats_update_end(&rx_stats->syncp);
2031         } else {
2032                 dev->stats.rx_dropped++;
2033         }
2034 }
2035
2036 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
2037                                  struct vxlan_dev *vxlan,
2038                                  union vxlan_addr *daddr,
2039                                  __be16 dst_port, int dst_ifindex, __be32 vni,
2040                                  struct dst_entry *dst,
2041                                  u32 rt_flags)
2042 {
2043 #if IS_ENABLED(CONFIG_IPV6)
2044         /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
2045          * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
2046          * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
2047          */
2048         BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
2049 #endif
2050         /* Bypass encapsulation if the destination is local */
2051         if (rt_flags & RTCF_LOCAL &&
2052             !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2053                 struct vxlan_dev *dst_vxlan;
2054
2055                 dst_release(dst);
2056                 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
2057                                            daddr->sa.sa_family, dst_port,
2058                                            vxlan->cfg.flags);
2059                 if (!dst_vxlan) {
2060                         dev->stats.tx_errors++;
2061                         kfree_skb(skb);
2062
2063                         return -ENOENT;
2064                 }
2065                 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni);
2066                 return 1;
2067         }
2068
2069         return 0;
2070 }
2071
2072 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
2073                            __be32 default_vni, struct vxlan_rdst *rdst,
2074                            bool did_rsc)
2075 {
2076         struct dst_cache *dst_cache;
2077         struct ip_tunnel_info *info;
2078         struct vxlan_dev *vxlan = netdev_priv(dev);
2079         const struct iphdr *old_iph = ip_hdr(skb);
2080         union vxlan_addr *dst;
2081         union vxlan_addr remote_ip, local_ip;
2082         struct vxlan_metadata _md;
2083         struct vxlan_metadata *md = &_md;
2084         __be16 src_port = 0, dst_port;
2085         struct dst_entry *ndst = NULL;
2086         __be32 vni, label;
2087         __u8 tos, ttl;
2088         int ifindex;
2089         int err;
2090         u32 flags = vxlan->cfg.flags;
2091         bool udp_sum = false;
2092         bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
2093
2094         info = skb_tunnel_info(skb);
2095
2096         if (rdst) {
2097                 dst = &rdst->remote_ip;
2098                 if (vxlan_addr_any(dst)) {
2099                         if (did_rsc) {
2100                                 /* short-circuited back to local bridge */
2101                                 vxlan_encap_bypass(skb, vxlan, vxlan, default_vni);
2102                                 return;
2103                         }
2104                         goto drop;
2105                 }
2106
2107                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
2108                 vni = (rdst->remote_vni) ? : default_vni;
2109                 ifindex = rdst->remote_ifindex;
2110                 local_ip = vxlan->cfg.saddr;
2111                 dst_cache = &rdst->dst_cache;
2112                 md->gbp = skb->mark;
2113                 ttl = vxlan->cfg.ttl;
2114                 if (!ttl && vxlan_addr_multicast(dst))
2115                         ttl = 1;
2116
2117                 tos = vxlan->cfg.tos;
2118                 if (tos == 1)
2119                         tos = ip_tunnel_get_dsfield(old_iph, skb);
2120
2121                 if (dst->sa.sa_family == AF_INET)
2122                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
2123                 else
2124                         udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
2125                 label = vxlan->cfg.label;
2126         } else {
2127                 if (!info) {
2128                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
2129                                   dev->name);
2130                         goto drop;
2131                 }
2132                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
2133                 if (remote_ip.sa.sa_family == AF_INET) {
2134                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
2135                         local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
2136                 } else {
2137                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
2138                         local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
2139                 }
2140                 dst = &remote_ip;
2141                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
2142                 vni = tunnel_id_to_key32(info->key.tun_id);
2143                 ifindex = 0;
2144                 dst_cache = &info->dst_cache;
2145                 if (info->options_len)
2146                         md = ip_tunnel_info_opts(info);
2147                 ttl = info->key.ttl;
2148                 tos = info->key.tos;
2149                 label = info->key.label;
2150                 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
2151         }
2152         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2153                                      vxlan->cfg.port_max, true);
2154
2155         rcu_read_lock();
2156         if (dst->sa.sa_family == AF_INET) {
2157                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2158                 struct rtable *rt;
2159                 __be16 df = 0;
2160
2161                 rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
2162                                      dst->sin.sin_addr.s_addr,
2163                                      &local_ip.sin.sin_addr.s_addr,
2164                                      dst_port, src_port,
2165                                      dst_cache, info);
2166                 if (IS_ERR(rt)) {
2167                         err = PTR_ERR(rt);
2168                         goto tx_error;
2169                 }
2170
2171                 /* Bypass encapsulation if the destination is local */
2172                 if (!info) {
2173                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2174                                                     dst_port, ifindex, vni,
2175                                                     &rt->dst, rt->rt_flags);
2176                         if (err)
2177                                 goto out_unlock;
2178                 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
2179                         df = htons(IP_DF);
2180                 }
2181
2182                 ndst = &rt->dst;
2183                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2184                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2185                 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
2186                                       vni, md, flags, udp_sum);
2187                 if (err < 0)
2188                         goto tx_error;
2189
2190                 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
2191                                     dst->sin.sin_addr.s_addr, tos, ttl, df,
2192                                     src_port, dst_port, xnet, !udp_sum);
2193 #if IS_ENABLED(CONFIG_IPV6)
2194         } else {
2195                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2196
2197                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
2198                                         label, &dst->sin6.sin6_addr,
2199                                         &local_ip.sin6.sin6_addr,
2200                                         dst_port, src_port,
2201                                         dst_cache, info);
2202                 if (IS_ERR(ndst)) {
2203                         err = PTR_ERR(ndst);
2204                         ndst = NULL;
2205                         goto tx_error;
2206                 }
2207
2208                 if (!info) {
2209                         u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2210
2211                         err = encap_bypass_if_local(skb, dev, vxlan, dst,
2212                                                     dst_port, ifindex, vni,
2213                                                     ndst, rt6i_flags);
2214                         if (err)
2215                                 goto out_unlock;
2216                 }
2217
2218                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2219                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2220                 skb_scrub_packet(skb, xnet);
2221                 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
2222                                       vni, md, flags, udp_sum);
2223                 if (err < 0)
2224                         goto tx_error;
2225
2226                 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
2227                                      &local_ip.sin6.sin6_addr,
2228                                      &dst->sin6.sin6_addr, tos, ttl,
2229                                      label, src_port, dst_port, !udp_sum);
2230 #endif
2231         }
2232 out_unlock:
2233         rcu_read_unlock();
2234         return;
2235
2236 drop:
2237         dev->stats.tx_dropped++;
2238         dev_kfree_skb(skb);
2239         return;
2240
2241 tx_error:
2242         rcu_read_unlock();
2243         if (err == -ELOOP)
2244                 dev->stats.collisions++;
2245         else if (err == -ENETUNREACH)
2246                 dev->stats.tx_carrier_errors++;
2247         dst_release(ndst);
2248         dev->stats.tx_errors++;
2249         kfree_skb(skb);
2250 }
2251
2252 /* Transmit local packets over Vxlan
2253  *
2254  * Outer IP header inherits ECN and DF from inner header.
2255  * Outer UDP destination is the VXLAN assigned port.
2256  *           source port is based on hash of flow
2257  */
2258 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2259 {
2260         struct vxlan_dev *vxlan = netdev_priv(dev);
2261         const struct ip_tunnel_info *info;
2262         struct ethhdr *eth;
2263         bool did_rsc = false;
2264         struct vxlan_rdst *rdst, *fdst = NULL;
2265         struct vxlan_fdb *f;
2266         __be32 vni = 0;
2267
2268         info = skb_tunnel_info(skb);
2269
2270         skb_reset_mac_header(skb);
2271
2272         if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
2273                 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
2274                     info->mode & IP_TUNNEL_INFO_TX) {
2275                         vni = tunnel_id_to_key32(info->key.tun_id);
2276                 } else {
2277                         if (info && info->mode & IP_TUNNEL_INFO_TX)
2278                                 vxlan_xmit_one(skb, dev, vni, NULL, false);
2279                         else
2280                                 kfree_skb(skb);
2281                         return NETDEV_TX_OK;
2282                 }
2283         }
2284
2285         if (vxlan->cfg.flags & VXLAN_F_PROXY) {
2286                 eth = eth_hdr(skb);
2287                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2288                         return arp_reduce(dev, skb, vni);
2289 #if IS_ENABLED(CONFIG_IPV6)
2290                 else if (ntohs(eth->h_proto) == ETH_P_IPV6) {
2291                         struct ipv6hdr *hdr, _hdr;
2292                         if ((hdr = skb_header_pointer(skb,
2293                                                       skb_network_offset(skb),
2294                                                       sizeof(_hdr), &_hdr)) &&
2295                             hdr->nexthdr == IPPROTO_ICMPV6)
2296                                 return neigh_reduce(dev, skb, vni);
2297                 }
2298 #endif
2299         }
2300
2301         eth = eth_hdr(skb);
2302         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2303         did_rsc = false;
2304
2305         if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
2306             (ntohs(eth->h_proto) == ETH_P_IP ||
2307              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2308                 did_rsc = route_shortcircuit(dev, skb);
2309                 if (did_rsc)
2310                         f = vxlan_find_mac(vxlan, eth->h_dest, vni);
2311         }
2312
2313         if (f == NULL) {
2314                 f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
2315                 if (f == NULL) {
2316                         if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
2317                             !is_multicast_ether_addr(eth->h_dest))
2318                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2319
2320                         dev->stats.tx_dropped++;
2321                         kfree_skb(skb);
2322                         return NETDEV_TX_OK;
2323                 }
2324         }
2325
2326         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2327                 struct sk_buff *skb1;
2328
2329                 if (!fdst) {
2330                         fdst = rdst;
2331                         continue;
2332                 }
2333                 skb1 = skb_clone(skb, GFP_ATOMIC);
2334                 if (skb1)
2335                         vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
2336         }
2337
2338         if (fdst)
2339                 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
2340         else
2341                 kfree_skb(skb);
2342         return NETDEV_TX_OK;
2343 }
2344
2345 /* Walk the forwarding table and purge stale entries */
2346 static void vxlan_cleanup(unsigned long arg)
2347 {
2348         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2349         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2350         unsigned int h;
2351
2352         if (!netif_running(vxlan->dev))
2353                 return;
2354
2355         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2356                 struct hlist_node *p, *n;
2357
2358                 spin_lock_bh(&vxlan->hash_lock);
2359                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2360                         struct vxlan_fdb *f
2361                                 = container_of(p, struct vxlan_fdb, hlist);
2362                         unsigned long timeout;
2363
2364                         if (f->state & (NUD_PERMANENT | NUD_NOARP))
2365                                 continue;
2366
2367                         if (f->flags & NTF_EXT_LEARNED)
2368                                 continue;
2369
2370                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2371                         if (time_before_eq(timeout, jiffies)) {
2372                                 netdev_dbg(vxlan->dev,
2373                                            "garbage collect %pM\n",
2374                                            f->eth_addr);
2375                                 f->state = NUD_STALE;
2376                                 vxlan_fdb_destroy(vxlan, f);
2377                         } else if (time_before(timeout, next_timer))
2378                                 next_timer = timeout;
2379                 }
2380                 spin_unlock_bh(&vxlan->hash_lock);
2381         }
2382
2383         mod_timer(&vxlan->age_timer, next_timer);
2384 }
2385
2386 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
2387 {
2388         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2389
2390         spin_lock(&vn->sock_lock);
2391         hlist_del_init_rcu(&vxlan->hlist4.hlist);
2392 #if IS_ENABLED(CONFIG_IPV6)
2393         hlist_del_init_rcu(&vxlan->hlist6.hlist);
2394 #endif
2395         spin_unlock(&vn->sock_lock);
2396 }
2397
2398 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
2399                              struct vxlan_dev_node *node)
2400 {
2401         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2402         __be32 vni = vxlan->default_dst.remote_vni;
2403
2404         node->vxlan = vxlan;
2405         spin_lock(&vn->sock_lock);
2406         hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
2407         spin_unlock(&vn->sock_lock);
2408 }
2409
2410 /* Setup stats when device is created */
2411 static int vxlan_init(struct net_device *dev)
2412 {
2413         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2414         if (!dev->tstats)
2415                 return -ENOMEM;
2416
2417         return 0;
2418 }
2419
2420 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
2421 {
2422         struct vxlan_fdb *f;
2423
2424         spin_lock_bh(&vxlan->hash_lock);
2425         f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
2426         if (f)
2427                 vxlan_fdb_destroy(vxlan, f);
2428         spin_unlock_bh(&vxlan->hash_lock);
2429 }
2430
2431 static void vxlan_uninit(struct net_device *dev)
2432 {
2433         struct vxlan_dev *vxlan = netdev_priv(dev);
2434
2435         vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
2436
2437         free_percpu(dev->tstats);
2438 }
2439
2440 /* Start ageing timer and join group when device is brought up */
2441 static int vxlan_open(struct net_device *dev)
2442 {
2443         struct vxlan_dev *vxlan = netdev_priv(dev);
2444         int ret;
2445
2446         ret = vxlan_sock_add(vxlan);
2447         if (ret < 0)
2448                 return ret;
2449
2450         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2451                 ret = vxlan_igmp_join(vxlan);
2452                 if (ret == -EADDRINUSE)
2453                         ret = 0;
2454                 if (ret) {
2455                         vxlan_sock_release(vxlan);
2456                         return ret;
2457                 }
2458         }
2459
2460         if (vxlan->cfg.age_interval)
2461                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2462
2463         return ret;
2464 }
2465
2466 /* Purge the forwarding table */
2467 static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
2468 {
2469         unsigned int h;
2470
2471         spin_lock_bh(&vxlan->hash_lock);
2472         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2473                 struct hlist_node *p, *n;
2474                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2475                         struct vxlan_fdb *f
2476                                 = container_of(p, struct vxlan_fdb, hlist);
2477                         if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
2478                                 continue;
2479                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2480                         if (!is_zero_ether_addr(f->eth_addr))
2481                                 vxlan_fdb_destroy(vxlan, f);
2482                 }
2483         }
2484         spin_unlock_bh(&vxlan->hash_lock);
2485 }
2486
2487 /* Cleanup timer and forwarding table on shutdown */
2488 static int vxlan_stop(struct net_device *dev)
2489 {
2490         struct vxlan_dev *vxlan = netdev_priv(dev);
2491         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2492         int ret = 0;
2493
2494         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2495             !vxlan_group_used(vn, vxlan))
2496                 ret = vxlan_igmp_leave(vxlan);
2497
2498         del_timer_sync(&vxlan->age_timer);
2499
2500         vxlan_flush(vxlan, false);
2501         vxlan_sock_release(vxlan);
2502
2503         return ret;
2504 }
2505
2506 /* Stub, nothing needs to be done. */
2507 static void vxlan_set_multicast_list(struct net_device *dev)
2508 {
2509 }
2510
2511 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2512 {
2513         struct vxlan_dev *vxlan = netdev_priv(dev);
2514         struct vxlan_rdst *dst = &vxlan->default_dst;
2515         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2516                                                          dst->remote_ifindex);
2517         bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
2518
2519         /* This check is different than dev->max_mtu, because it looks at
2520          * the lowerdev->mtu, rather than the static dev->max_mtu
2521          */
2522         if (lowerdev) {
2523                 int max_mtu = lowerdev->mtu -
2524                               (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2525                 if (new_mtu > max_mtu)
2526                         return -EINVAL;
2527         }
2528
2529         dev->mtu = new_mtu;
2530         return 0;
2531 }
2532
2533 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2534 {
2535         struct vxlan_dev *vxlan = netdev_priv(dev);
2536         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2537         __be16 sport, dport;
2538
2539         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2540                                   vxlan->cfg.port_max, true);
2541         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2542
2543         if (ip_tunnel_info_af(info) == AF_INET) {
2544                 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
2545                 struct rtable *rt;
2546
2547                 rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
2548                                      info->key.u.ipv4.dst,
2549                                      &info->key.u.ipv4.src, dport, sport,
2550                                      &info->dst_cache, info);
2551                 if (IS_ERR(rt))
2552                         return PTR_ERR(rt);
2553                 ip_rt_put(rt);
2554         } else {
2555 #if IS_ENABLED(CONFIG_IPV6)
2556                 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
2557                 struct dst_entry *ndst;
2558
2559                 ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
2560                                         info->key.label, &info->key.u.ipv6.dst,
2561                                         &info->key.u.ipv6.src, dport, sport,
2562                                         &info->dst_cache, info);
2563                 if (IS_ERR(ndst))
2564                         return PTR_ERR(ndst);
2565                 dst_release(ndst);
2566 #else /* !CONFIG_IPV6 */
2567                 return -EPFNOSUPPORT;
2568 #endif
2569         }
2570         info->key.tp_src = sport;
2571         info->key.tp_dst = dport;
2572         return 0;
2573 }
2574
2575 static const struct net_device_ops vxlan_netdev_ether_ops = {
2576         .ndo_init               = vxlan_init,
2577         .ndo_uninit             = vxlan_uninit,
2578         .ndo_open               = vxlan_open,
2579         .ndo_stop               = vxlan_stop,
2580         .ndo_start_xmit         = vxlan_xmit,
2581         .ndo_get_stats64        = ip_tunnel_get_stats64,
2582         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2583         .ndo_change_mtu         = vxlan_change_mtu,
2584         .ndo_validate_addr      = eth_validate_addr,
2585         .ndo_set_mac_address    = eth_mac_addr,
2586         .ndo_fdb_add            = vxlan_fdb_add,
2587         .ndo_fdb_del            = vxlan_fdb_delete,
2588         .ndo_fdb_dump           = vxlan_fdb_dump,
2589         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2590 };
2591
2592 static const struct net_device_ops vxlan_netdev_raw_ops = {
2593         .ndo_init               = vxlan_init,
2594         .ndo_uninit             = vxlan_uninit,
2595         .ndo_open               = vxlan_open,
2596         .ndo_stop               = vxlan_stop,
2597         .ndo_start_xmit         = vxlan_xmit,
2598         .ndo_get_stats64        = ip_tunnel_get_stats64,
2599         .ndo_change_mtu         = vxlan_change_mtu,
2600         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2601 };
2602
2603 /* Info for udev, that this is a virtual tunnel endpoint */
2604 static struct device_type vxlan_type = {
2605         .name = "vxlan",
2606 };
2607
2608 /* Calls the ndo_udp_tunnel_add of the caller in order to
2609  * supply the listening VXLAN udp ports. Callers are expected
2610  * to implement the ndo_udp_tunnel_add.
2611  */
2612 static void vxlan_push_rx_ports(struct net_device *dev)
2613 {
2614         struct vxlan_sock *vs;
2615         struct net *net = dev_net(dev);
2616         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2617         unsigned int i;
2618
2619         spin_lock(&vn->sock_lock);
2620         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2621                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist)
2622                         udp_tunnel_push_rx_port(dev, vs->sock,
2623                                                 (vs->flags & VXLAN_F_GPE) ?
2624                                                 UDP_TUNNEL_TYPE_VXLAN_GPE :
2625                                                 UDP_TUNNEL_TYPE_VXLAN);
2626         }
2627         spin_unlock(&vn->sock_lock);
2628 }
2629
2630 /* Initialize the device structure. */
2631 static void vxlan_setup(struct net_device *dev)
2632 {
2633         struct vxlan_dev *vxlan = netdev_priv(dev);
2634         unsigned int h;
2635
2636         eth_hw_addr_random(dev);
2637         ether_setup(dev);
2638
2639         dev->needs_free_netdev = true;
2640         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2641
2642         dev->features   |= NETIF_F_LLTX;
2643         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2644         dev->features   |= NETIF_F_RXCSUM;
2645         dev->features   |= NETIF_F_GSO_SOFTWARE;
2646
2647         dev->vlan_features = dev->features;
2648         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2649         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2650         netif_keep_dst(dev);
2651         dev->priv_flags |= IFF_NO_QUEUE;
2652
2653         /* MTU range: 68 - 65535 */
2654         dev->min_mtu = ETH_MIN_MTU;
2655         dev->max_mtu = ETH_MAX_MTU;
2656
2657         INIT_LIST_HEAD(&vxlan->next);
2658         spin_lock_init(&vxlan->hash_lock);
2659
2660         init_timer_deferrable(&vxlan->age_timer);
2661         vxlan->age_timer.function = vxlan_cleanup;
2662         vxlan->age_timer.data = (unsigned long) vxlan;
2663
2664         vxlan->dev = dev;
2665
2666         gro_cells_init(&vxlan->gro_cells, dev);
2667
2668         for (h = 0; h < FDB_HASH_SIZE; ++h)
2669                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2670 }
2671
2672 static void vxlan_ether_setup(struct net_device *dev)
2673 {
2674         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2675         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2676         dev->netdev_ops = &vxlan_netdev_ether_ops;
2677 }
2678
2679 static void vxlan_raw_setup(struct net_device *dev)
2680 {
2681         dev->header_ops = NULL;
2682         dev->type = ARPHRD_NONE;
2683         dev->hard_header_len = 0;
2684         dev->addr_len = 0;
2685         dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2686         dev->netdev_ops = &vxlan_netdev_raw_ops;
2687 }
2688
2689 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2690         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2691         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2692         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2693         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2694         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2695         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2696         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2697         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2698         [IFLA_VXLAN_LABEL]      = { .type = NLA_U32 },
2699         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2700         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2701         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2702         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2703         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2704         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2705         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2706         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2707         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2708         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2709         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2710         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2711         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2712         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2713         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2714         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2715         [IFLA_VXLAN_GPE]        = { .type = NLA_FLAG, },
2716         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2717 };
2718
2719 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
2720                           struct netlink_ext_ack *extack)
2721 {
2722         if (tb[IFLA_ADDRESS]) {
2723                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2724                         pr_debug("invalid link address (not ethernet)\n");
2725                         return -EINVAL;
2726                 }
2727
2728                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2729                         pr_debug("invalid all zero ethernet address\n");
2730                         return -EADDRNOTAVAIL;
2731                 }
2732         }
2733
2734         if (tb[IFLA_MTU]) {
2735                 u32 mtu = nla_get_u32(tb[IFLA_MTU]);
2736
2737                 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU)
2738                         return -EINVAL;
2739         }
2740
2741         if (!data)
2742                 return -EINVAL;
2743
2744         if (data[IFLA_VXLAN_ID]) {
2745                 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2746
2747                 if (id >= VXLAN_N_VID)
2748                         return -ERANGE;
2749         }
2750
2751         if (data[IFLA_VXLAN_PORT_RANGE]) {
2752                 const struct ifla_vxlan_port_range *p
2753                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2754
2755                 if (ntohs(p->high) < ntohs(p->low)) {
2756                         pr_debug("port range %u .. %u not valid\n",
2757                                  ntohs(p->low), ntohs(p->high));
2758                         return -EINVAL;
2759                 }
2760         }
2761
2762         return 0;
2763 }
2764
2765 static void vxlan_get_drvinfo(struct net_device *netdev,
2766                               struct ethtool_drvinfo *drvinfo)
2767 {
2768         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2769         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2770 }
2771
2772 static const struct ethtool_ops vxlan_ethtool_ops = {
2773         .get_drvinfo    = vxlan_get_drvinfo,
2774         .get_link       = ethtool_op_get_link,
2775 };
2776
2777 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2778                                         __be16 port, u32 flags)
2779 {
2780         struct socket *sock;
2781         struct udp_port_cfg udp_conf;
2782         int err;
2783
2784         memset(&udp_conf, 0, sizeof(udp_conf));
2785
2786         if (ipv6) {
2787                 udp_conf.family = AF_INET6;
2788                 udp_conf.use_udp6_rx_checksums =
2789                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2790                 udp_conf.ipv6_v6only = 1;
2791         } else {
2792                 udp_conf.family = AF_INET;
2793         }
2794
2795         udp_conf.local_udp_port = port;
2796
2797         /* Open UDP socket */
2798         err = udp_sock_create(net, &udp_conf, &sock);
2799         if (err < 0)
2800                 return ERR_PTR(err);
2801
2802         return sock;
2803 }
2804
2805 /* Create new listen socket if needed */
2806 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2807                                               __be16 port, u32 flags)
2808 {
2809         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2810         struct vxlan_sock *vs;
2811         struct socket *sock;
2812         unsigned int h;
2813         struct udp_tunnel_sock_cfg tunnel_cfg;
2814
2815         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2816         if (!vs)
2817                 return ERR_PTR(-ENOMEM);
2818
2819         for (h = 0; h < VNI_HASH_SIZE; ++h)
2820                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2821
2822         sock = vxlan_create_sock(net, ipv6, port, flags);
2823         if (IS_ERR(sock)) {
2824                 kfree(vs);
2825                 return ERR_CAST(sock);
2826         }
2827
2828         vs->sock = sock;
2829         refcount_set(&vs->refcnt, 1);
2830         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2831
2832         spin_lock(&vn->sock_lock);
2833         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2834         udp_tunnel_notify_add_rx_port(sock,
2835                                       (vs->flags & VXLAN_F_GPE) ?
2836                                       UDP_TUNNEL_TYPE_VXLAN_GPE :
2837                                       UDP_TUNNEL_TYPE_VXLAN);
2838         spin_unlock(&vn->sock_lock);
2839
2840         /* Mark socket as an encapsulation socket. */
2841         memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
2842         tunnel_cfg.sk_user_data = vs;
2843         tunnel_cfg.encap_type = 1;
2844         tunnel_cfg.encap_rcv = vxlan_rcv;
2845         tunnel_cfg.encap_destroy = NULL;
2846         tunnel_cfg.gro_receive = vxlan_gro_receive;
2847         tunnel_cfg.gro_complete = vxlan_gro_complete;
2848
2849         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2850
2851         return vs;
2852 }
2853
2854 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2855 {
2856         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2857         struct vxlan_sock *vs = NULL;
2858         struct vxlan_dev_node *node;
2859
2860         if (!vxlan->cfg.no_share) {
2861                 spin_lock(&vn->sock_lock);
2862                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2863                                      vxlan->cfg.dst_port, vxlan->cfg.flags);
2864                 if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
2865                         spin_unlock(&vn->sock_lock);
2866                         return -EBUSY;
2867                 }
2868                 spin_unlock(&vn->sock_lock);
2869         }
2870         if (!vs)
2871                 vs = vxlan_socket_create(vxlan->net, ipv6,
2872                                          vxlan->cfg.dst_port, vxlan->cfg.flags);
2873         if (IS_ERR(vs))
2874                 return PTR_ERR(vs);
2875 #if IS_ENABLED(CONFIG_IPV6)
2876         if (ipv6) {
2877                 rcu_assign_pointer(vxlan->vn6_sock, vs);
2878                 node = &vxlan->hlist6;
2879         } else
2880 #endif
2881         {
2882                 rcu_assign_pointer(vxlan->vn4_sock, vs);
2883                 node = &vxlan->hlist4;
2884         }
2885         vxlan_vs_add_dev(vs, vxlan, node);
2886         return 0;
2887 }
2888
2889 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2890 {
2891         bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
2892         bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
2893         bool ipv4 = !ipv6 || metadata;
2894         int ret = 0;
2895
2896         RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
2897 #if IS_ENABLED(CONFIG_IPV6)
2898         RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
2899         if (ipv6) {
2900                 ret = __vxlan_sock_add(vxlan, true);
2901                 if (ret < 0 && ret != -EAFNOSUPPORT)
2902                         ipv4 = false;
2903         }
2904 #endif
2905         if (ipv4)
2906                 ret = __vxlan_sock_add(vxlan, false);
2907         if (ret < 0)
2908                 vxlan_sock_release(vxlan);
2909         return ret;
2910 }
2911
2912 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
2913                                  struct net_device **lower,
2914                                  struct vxlan_dev *old)
2915 {
2916         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2917         struct vxlan_dev *tmp;
2918         bool use_ipv6 = false;
2919
2920         if (conf->flags & VXLAN_F_GPE) {
2921                 /* For now, allow GPE only together with
2922                  * COLLECT_METADATA. This can be relaxed later; in such
2923                  * case, the other side of the PtP link will have to be
2924                  * provided.
2925                  */
2926                 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
2927                     !(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2928                         return -EINVAL;
2929                 }
2930         }
2931
2932         if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
2933                 /* Unless IPv6 is explicitly requested, assume IPv4 */
2934                 conf->remote_ip.sa.sa_family = AF_INET;
2935                 conf->saddr.sa.sa_family = AF_INET;
2936         } else if (!conf->remote_ip.sa.sa_family) {
2937                 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
2938         } else if (!conf->saddr.sa.sa_family) {
2939                 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
2940         }
2941
2942         if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family)
2943                 return -EINVAL;
2944
2945         if (vxlan_addr_multicast(&conf->saddr))
2946                 return -EINVAL;
2947
2948         if (conf->saddr.sa.sa_family == AF_INET6) {
2949                 if (!IS_ENABLED(CONFIG_IPV6))
2950                         return -EPFNOSUPPORT;
2951                 use_ipv6 = true;
2952                 conf->flags |= VXLAN_F_IPV6;
2953
2954                 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
2955                         int local_type =
2956                                 ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
2957                         int remote_type =
2958                                 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
2959
2960                         if (local_type & IPV6_ADDR_LINKLOCAL) {
2961                                 if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
2962                                     (remote_type != IPV6_ADDR_ANY))
2963                                         return -EINVAL;
2964
2965                                 conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
2966                         } else {
2967                                 if (remote_type ==
2968                                     (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL))
2969                                         return -EINVAL;
2970
2971                                 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
2972                         }
2973                 }
2974         }
2975
2976         if (conf->label && !use_ipv6)
2977                 return -EINVAL;
2978
2979         if (conf->remote_ifindex) {
2980                 struct net_device *lowerdev;
2981
2982                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2983                 if (!lowerdev)
2984                         return -ENODEV;
2985
2986 #if IS_ENABLED(CONFIG_IPV6)
2987                 if (use_ipv6) {
2988                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2989                         if (idev && idev->cnf.disable_ipv6)
2990                                 return -EPERM;
2991                 }
2992 #endif
2993
2994                 *lower = lowerdev;
2995         } else {
2996                 if (vxlan_addr_multicast(&conf->remote_ip))
2997                         return -EINVAL;
2998
2999 #if IS_ENABLED(CONFIG_IPV6)
3000                 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL)
3001                         return -EINVAL;
3002 #endif
3003
3004                 *lower = NULL;
3005         }
3006
3007         if (!conf->dst_port) {
3008                 if (conf->flags & VXLAN_F_GPE)
3009                         conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
3010                 else
3011                         conf->dst_port = htons(vxlan_port);
3012         }
3013
3014         if (!conf->age_interval)
3015                 conf->age_interval = FDB_AGE_DEFAULT;
3016
3017         list_for_each_entry(tmp, &vn->vxlan_list, next) {
3018                 if (tmp == old)
3019                         continue;
3020
3021                 if (tmp->cfg.vni != conf->vni)
3022                         continue;
3023                 if (tmp->cfg.dst_port != conf->dst_port)
3024                         continue;
3025                 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
3026                     (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
3027                         continue;
3028
3029                 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
3030                     tmp->cfg.remote_ifindex != conf->remote_ifindex)
3031                         continue;
3032
3033                 return -EEXIST;
3034         }
3035
3036         return 0;
3037 }
3038
3039 static void vxlan_config_apply(struct net_device *dev,
3040                                struct vxlan_config *conf,
3041                                struct net_device *lowerdev,
3042                                struct net *src_net,
3043                                bool changelink)
3044 {
3045         struct vxlan_dev *vxlan = netdev_priv(dev);
3046         struct vxlan_rdst *dst = &vxlan->default_dst;
3047         unsigned short needed_headroom = ETH_HLEN;
3048         bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
3049         int max_mtu = ETH_MAX_MTU;
3050
3051         if (!changelink) {
3052                 if (conf->flags & VXLAN_F_GPE)
3053                         vxlan_raw_setup(dev);
3054                 else
3055                         vxlan_ether_setup(dev);
3056
3057                 if (conf->mtu)
3058                         dev->mtu = conf->mtu;
3059
3060                 vxlan->net = src_net;
3061         }
3062
3063         dst->remote_vni = conf->vni;
3064
3065         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
3066
3067         if (lowerdev) {
3068                 dst->remote_ifindex = conf->remote_ifindex;
3069
3070                 dev->gso_max_size = lowerdev->gso_max_size;
3071                 dev->gso_max_segs = lowerdev->gso_max_segs;
3072
3073                 needed_headroom = lowerdev->hard_header_len;
3074
3075                 max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
3076                                            VXLAN_HEADROOM);
3077         }
3078
3079         if (dev->mtu > max_mtu)
3080                 dev->mtu = max_mtu;
3081
3082         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
3083                 needed_headroom += VXLAN6_HEADROOM;
3084         else
3085                 needed_headroom += VXLAN_HEADROOM;
3086         dev->needed_headroom = needed_headroom;
3087
3088         memcpy(&vxlan->cfg, conf, sizeof(*conf));
3089 }
3090
3091 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
3092                                struct vxlan_config *conf,
3093                                bool changelink)
3094 {
3095         struct vxlan_dev *vxlan = netdev_priv(dev);
3096         struct net_device *lowerdev;
3097         int ret;
3098
3099         ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan);
3100         if (ret)
3101                 return ret;
3102
3103         vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
3104
3105         return 0;
3106 }
3107
3108 static int __vxlan_dev_create(struct net *net, struct net_device *dev,
3109                               struct vxlan_config *conf)
3110 {
3111         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3112         struct vxlan_dev *vxlan = netdev_priv(dev);
3113         int err;
3114
3115         err = vxlan_dev_configure(net, dev, conf, false);
3116         if (err)
3117                 return err;
3118
3119         dev->ethtool_ops = &vxlan_ethtool_ops;
3120
3121         /* create an fdb entry for a valid default destination */
3122         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
3123                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
3124                                        &vxlan->default_dst.remote_ip,
3125                                        NUD_REACHABLE | NUD_PERMANENT,
3126                                        NLM_F_EXCL | NLM_F_CREATE,
3127                                        vxlan->cfg.dst_port,
3128                                        vxlan->default_dst.remote_vni,
3129                                        vxlan->default_dst.remote_vni,
3130                                        vxlan->default_dst.remote_ifindex,
3131                                        NTF_SELF);
3132                 if (err)
3133                         return err;
3134         }
3135
3136         err = register_netdevice(dev);
3137         if (err) {
3138                 vxlan_fdb_delete_default(vxlan, vxlan->default_dst.remote_vni);
3139                 return err;
3140         }
3141
3142         list_add(&vxlan->next, &vn->vxlan_list);
3143         return 0;
3144 }
3145
3146 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
3147                          struct net_device *dev, struct vxlan_config *conf,
3148                          bool changelink)
3149 {
3150         struct vxlan_dev *vxlan = netdev_priv(dev);
3151
3152         memset(conf, 0, sizeof(*conf));
3153
3154         /* if changelink operation, start with old existing cfg */
3155         if (changelink)
3156                 memcpy(conf, &vxlan->cfg, sizeof(*conf));
3157
3158         if (data[IFLA_VXLAN_ID]) {
3159                 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3160
3161                 if (changelink && (vni != conf->vni))
3162                         return -EOPNOTSUPP;
3163                 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
3164         }
3165
3166         if (data[IFLA_VXLAN_GROUP]) {
3167                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
3168                         return -EOPNOTSUPP;
3169
3170                 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
3171                 conf->remote_ip.sa.sa_family = AF_INET;
3172         } else if (data[IFLA_VXLAN_GROUP6]) {
3173                 if (!IS_ENABLED(CONFIG_IPV6))
3174                         return -EPFNOSUPPORT;
3175
3176                 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
3177                         return -EOPNOTSUPP;
3178
3179                 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
3180                 conf->remote_ip.sa.sa_family = AF_INET6;
3181         }
3182
3183         if (data[IFLA_VXLAN_LOCAL]) {
3184                 if (changelink && (conf->saddr.sa.sa_family != AF_INET))
3185                         return -EOPNOTSUPP;
3186
3187                 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
3188                 conf->saddr.sa.sa_family = AF_INET;
3189         } else if (data[IFLA_VXLAN_LOCAL6]) {
3190                 if (!IS_ENABLED(CONFIG_IPV6))
3191                         return -EPFNOSUPPORT;
3192
3193                 if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
3194                         return -EOPNOTSUPP;
3195
3196                 /* TODO: respect scope id */
3197                 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
3198                 conf->saddr.sa.sa_family = AF_INET6;
3199         }
3200
3201         if (data[IFLA_VXLAN_LINK])
3202                 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
3203
3204         if (data[IFLA_VXLAN_TOS])
3205                 conf->tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
3206
3207         if (data[IFLA_VXLAN_TTL])
3208                 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
3209
3210         if (data[IFLA_VXLAN_LABEL])
3211                 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
3212                              IPV6_FLOWLABEL_MASK;
3213
3214         if (data[IFLA_VXLAN_LEARNING]) {
3215                 if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
3216                         conf->flags |= VXLAN_F_LEARN;
3217                 else
3218                         conf->flags &= ~VXLAN_F_LEARN;
3219         } else if (!changelink) {
3220                 /* default to learn on a new device */
3221                 conf->flags |= VXLAN_F_LEARN;
3222         }
3223
3224         if (data[IFLA_VXLAN_AGEING]) {
3225                 if (changelink)
3226                         return -EOPNOTSUPP;
3227                 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
3228         }
3229
3230         if (data[IFLA_VXLAN_PROXY]) {
3231                 if (changelink)
3232                         return -EOPNOTSUPP;
3233                 if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
3234                         conf->flags |= VXLAN_F_PROXY;
3235         }
3236
3237         if (data[IFLA_VXLAN_RSC]) {
3238                 if (changelink)
3239                         return -EOPNOTSUPP;
3240                 if (nla_get_u8(data[IFLA_VXLAN_RSC]))
3241                         conf->flags |= VXLAN_F_RSC;
3242         }
3243
3244         if (data[IFLA_VXLAN_L2MISS]) {
3245                 if (changelink)
3246                         return -EOPNOTSUPP;
3247                 if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
3248                         conf->flags |= VXLAN_F_L2MISS;
3249         }
3250
3251         if (data[IFLA_VXLAN_L3MISS]) {
3252                 if (changelink)
3253                         return -EOPNOTSUPP;
3254                 if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
3255                         conf->flags |= VXLAN_F_L3MISS;
3256         }
3257
3258         if (data[IFLA_VXLAN_LIMIT]) {
3259                 if (changelink)
3260                         return -EOPNOTSUPP;
3261                 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
3262         }
3263
3264         if (data[IFLA_VXLAN_COLLECT_METADATA]) {
3265                 if (changelink)
3266                         return -EOPNOTSUPP;
3267                 if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
3268                         conf->flags |= VXLAN_F_COLLECT_METADATA;
3269         }
3270
3271         if (data[IFLA_VXLAN_PORT_RANGE]) {
3272                 if (!changelink) {
3273                         const struct ifla_vxlan_port_range *p
3274                                 = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
3275                         conf->port_min = ntohs(p->low);
3276                         conf->port_max = ntohs(p->high);
3277                 } else {
3278                         return -EOPNOTSUPP;
3279                 }
3280         }
3281
3282         if (data[IFLA_VXLAN_PORT]) {
3283                 if (changelink)
3284                         return -EOPNOTSUPP;
3285                 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
3286         }
3287
3288         if (data[IFLA_VXLAN_UDP_CSUM]) {
3289                 if (changelink)
3290                         return -EOPNOTSUPP;
3291                 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
3292                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
3293         }
3294
3295         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
3296                 if (changelink)
3297                         return -EOPNOTSUPP;
3298                 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
3299                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
3300         }
3301
3302         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
3303                 if (changelink)
3304                         return -EOPNOTSUPP;
3305                 if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3306                         conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3307         }
3308
3309         if (data[IFLA_VXLAN_REMCSUM_TX]) {
3310                 if (changelink)
3311                         return -EOPNOTSUPP;
3312                 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3313                         conf->flags |= VXLAN_F_REMCSUM_TX;
3314         }
3315
3316         if (data[IFLA_VXLAN_REMCSUM_RX]) {
3317                 if (changelink)
3318                         return -EOPNOTSUPP;
3319                 if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3320                         conf->flags |= VXLAN_F_REMCSUM_RX;
3321         }
3322
3323         if (data[IFLA_VXLAN_GBP]) {
3324                 if (changelink)
3325                         return -EOPNOTSUPP;
3326                 conf->flags |= VXLAN_F_GBP;
3327         }
3328
3329         if (data[IFLA_VXLAN_GPE]) {
3330                 if (changelink)
3331                         return -EOPNOTSUPP;
3332                 conf->flags |= VXLAN_F_GPE;
3333         }
3334
3335         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
3336                 if (changelink)
3337                         return -EOPNOTSUPP;
3338                 conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3339         }
3340
3341         if (tb[IFLA_MTU]) {
3342                 if (changelink)
3343                         return -EOPNOTSUPP;
3344                 conf->mtu = nla_get_u32(tb[IFLA_MTU]);
3345         }
3346
3347         return 0;
3348 }
3349
3350 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
3351                          struct nlattr *tb[], struct nlattr *data[],
3352                          struct netlink_ext_ack *extack)
3353 {
3354         struct vxlan_config conf;
3355         int err;
3356
3357         err = vxlan_nl2conf(tb, data, dev, &conf, false);
3358         if (err)
3359                 return err;
3360
3361         return __vxlan_dev_create(src_net, dev, &conf);
3362 }
3363
3364 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
3365                             struct nlattr *data[],
3366                             struct netlink_ext_ack *extack)
3367 {
3368         struct vxlan_dev *vxlan = netdev_priv(dev);
3369         struct vxlan_rdst *dst = &vxlan->default_dst;
3370         struct vxlan_rdst old_dst;
3371         struct vxlan_config conf;
3372         int err;
3373
3374         err = vxlan_nl2conf(tb, data,
3375                             dev, &conf, true);
3376         if (err)
3377                 return err;
3378
3379         memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
3380
3381         err = vxlan_dev_configure(vxlan->net, dev, &conf, true);
3382         if (err)
3383                 return err;
3384
3385         /* handle default dst entry */
3386         if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
3387                 spin_lock_bh(&vxlan->hash_lock);
3388                 if (!vxlan_addr_any(&old_dst.remote_ip))
3389                         __vxlan_fdb_delete(vxlan, all_zeros_mac,
3390                                            old_dst.remote_ip,
3391                                            vxlan->cfg.dst_port,
3392                                            old_dst.remote_vni,
3393                                            old_dst.remote_vni,
3394                                            old_dst.remote_ifindex, 0);
3395
3396                 if (!vxlan_addr_any(&dst->remote_ip)) {
3397                         err = vxlan_fdb_create(vxlan, all_zeros_mac,
3398                                                &dst->remote_ip,
3399                                                NUD_REACHABLE | NUD_PERMANENT,
3400                                                NLM_F_CREATE | NLM_F_APPEND,
3401                                                vxlan->cfg.dst_port,
3402                                                dst->remote_vni,
3403                                                dst->remote_vni,
3404                                                dst->remote_ifindex,
3405                                                NTF_SELF);
3406                         if (err) {
3407                                 spin_unlock_bh(&vxlan->hash_lock);
3408                                 return err;
3409                         }
3410                 }
3411                 spin_unlock_bh(&vxlan->hash_lock);
3412         }
3413
3414         return 0;
3415 }
3416
3417 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3418 {
3419         struct vxlan_dev *vxlan = netdev_priv(dev);
3420
3421         vxlan_flush(vxlan, true);
3422
3423         gro_cells_destroy(&vxlan->gro_cells);
3424         list_del(&vxlan->next);
3425         unregister_netdevice_queue(dev, head);
3426 }
3427
3428 static size_t vxlan_get_size(const struct net_device *dev)
3429 {
3430
3431         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3432                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3433                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3434                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3435                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3436                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3437                 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
3438                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3439                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3440                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3441                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3442                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3443                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3444                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3445                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3446                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3447                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3448                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3449                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3450                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3451                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3452                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3453                 0;
3454 }
3455
3456 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3457 {
3458         const struct vxlan_dev *vxlan = netdev_priv(dev);
3459         const struct vxlan_rdst *dst = &vxlan->default_dst;
3460         struct ifla_vxlan_port_range ports = {
3461                 .low =  htons(vxlan->cfg.port_min),
3462                 .high = htons(vxlan->cfg.port_max),
3463         };
3464
3465         if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
3466                 goto nla_put_failure;
3467
3468         if (!vxlan_addr_any(&dst->remote_ip)) {
3469                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3470                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3471                                             dst->remote_ip.sin.sin_addr.s_addr))
3472                                 goto nla_put_failure;
3473 #if IS_ENABLED(CONFIG_IPV6)
3474                 } else {
3475                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3476                                              &dst->remote_ip.sin6.sin6_addr))
3477                                 goto nla_put_failure;
3478 #endif
3479                 }
3480         }
3481
3482         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3483                 goto nla_put_failure;
3484
3485         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3486                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3487                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3488                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3489                                 goto nla_put_failure;
3490 #if IS_ENABLED(CONFIG_IPV6)
3491                 } else {
3492                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3493                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3494                                 goto nla_put_failure;
3495 #endif
3496                 }
3497         }
3498
3499         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3500             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3501             nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
3502             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3503                         !!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
3504             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3505                         !!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
3506             nla_put_u8(skb, IFLA_VXLAN_RSC,
3507                        !!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
3508             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3509                         !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
3510             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3511                         !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
3512             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3513                        !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
3514             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3515             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3516             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3517             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3518                         !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
3519             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3520                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3521             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3522                         !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3523             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3524                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
3525             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3526                         !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
3527                 goto nla_put_failure;
3528
3529         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3530                 goto nla_put_failure;
3531
3532         if (vxlan->cfg.flags & VXLAN_F_GBP &&
3533             nla_put_flag(skb, IFLA_VXLAN_GBP))
3534                 goto nla_put_failure;
3535
3536         if (vxlan->cfg.flags & VXLAN_F_GPE &&
3537             nla_put_flag(skb, IFLA_VXLAN_GPE))
3538                 goto nla_put_failure;
3539
3540         if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3541             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3542                 goto nla_put_failure;
3543
3544         return 0;
3545
3546 nla_put_failure:
3547         return -EMSGSIZE;
3548 }
3549
3550 static struct net *vxlan_get_link_net(const struct net_device *dev)
3551 {
3552         struct vxlan_dev *vxlan = netdev_priv(dev);
3553
3554         return vxlan->net;
3555 }
3556
3557 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3558         .kind           = "vxlan",
3559         .maxtype        = IFLA_VXLAN_MAX,
3560         .policy         = vxlan_policy,
3561         .priv_size      = sizeof(struct vxlan_dev),
3562         .setup          = vxlan_setup,
3563         .validate       = vxlan_validate,
3564         .newlink        = vxlan_newlink,
3565         .changelink     = vxlan_changelink,
3566         .dellink        = vxlan_dellink,
3567         .get_size       = vxlan_get_size,
3568         .fill_info      = vxlan_fill_info,
3569         .get_link_net   = vxlan_get_link_net,
3570 };
3571
3572 struct net_device *vxlan_dev_create(struct net *net, const char *name,
3573                                     u8 name_assign_type,
3574                                     struct vxlan_config *conf)
3575 {
3576         struct nlattr *tb[IFLA_MAX + 1];
3577         struct net_device *dev;
3578         int err;
3579
3580         memset(&tb, 0, sizeof(tb));
3581
3582         dev = rtnl_create_link(net, name, name_assign_type,
3583                                &vxlan_link_ops, tb);
3584         if (IS_ERR(dev))
3585                 return dev;
3586
3587         err = __vxlan_dev_create(net, dev, conf);
3588         if (err < 0) {
3589                 free_netdev(dev);
3590                 return ERR_PTR(err);
3591         }
3592
3593         err = rtnl_configure_link(dev, NULL);
3594         if (err < 0) {
3595                 LIST_HEAD(list_kill);
3596
3597                 vxlan_dellink(dev, &list_kill);
3598                 unregister_netdevice_many(&list_kill);
3599                 return ERR_PTR(err);
3600         }
3601
3602         return dev;
3603 }
3604 EXPORT_SYMBOL_GPL(vxlan_dev_create);
3605
3606 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3607                                              struct net_device *dev)
3608 {
3609         struct vxlan_dev *vxlan, *next;
3610         LIST_HEAD(list_kill);
3611
3612         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3613                 struct vxlan_rdst *dst = &vxlan->default_dst;
3614
3615                 /* In case we created vxlan device with carrier
3616                  * and we loose the carrier due to module unload
3617                  * we also need to remove vxlan device. In other
3618                  * cases, it's not necessary and remote_ifindex
3619                  * is 0 here, so no matches.
3620                  */
3621                 if (dst->remote_ifindex == dev->ifindex)
3622                         vxlan_dellink(vxlan->dev, &list_kill);
3623         }
3624
3625         unregister_netdevice_many(&list_kill);
3626 }
3627
3628 static int vxlan_netdevice_event(struct notifier_block *unused,
3629                                  unsigned long event, void *ptr)
3630 {
3631         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3632         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3633
3634         if (event == NETDEV_UNREGISTER)
3635                 vxlan_handle_lowerdev_unregister(vn, dev);
3636         else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO)
3637                 vxlan_push_rx_ports(dev);
3638
3639         return NOTIFY_DONE;
3640 }
3641
3642 static struct notifier_block vxlan_notifier_block __read_mostly = {
3643         .notifier_call = vxlan_netdevice_event,
3644 };
3645
3646 static __net_init int vxlan_init_net(struct net *net)
3647 {
3648         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3649         unsigned int h;
3650
3651         INIT_LIST_HEAD(&vn->vxlan_list);
3652         spin_lock_init(&vn->sock_lock);
3653
3654         for (h = 0; h < PORT_HASH_SIZE; ++h)
3655                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3656
3657         return 0;
3658 }
3659
3660 static void __net_exit vxlan_exit_net(struct net *net)
3661 {
3662         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3663         struct vxlan_dev *vxlan, *next;
3664         struct net_device *dev, *aux;
3665         LIST_HEAD(list);
3666
3667         rtnl_lock();
3668         for_each_netdev_safe(net, dev, aux)
3669                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3670                         unregister_netdevice_queue(dev, &list);
3671
3672         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3673                 /* If vxlan->dev is in the same netns, it has already been added
3674                  * to the list by the previous loop.
3675                  */
3676                 if (!net_eq(dev_net(vxlan->dev), net)) {
3677                         gro_cells_destroy(&vxlan->gro_cells);
3678                         unregister_netdevice_queue(vxlan->dev, &list);
3679                 }
3680         }
3681
3682         unregister_netdevice_many(&list);
3683         rtnl_unlock();
3684 }
3685
3686 static struct pernet_operations vxlan_net_ops = {
3687         .init = vxlan_init_net,
3688         .exit = vxlan_exit_net,
3689         .id   = &vxlan_net_id,
3690         .size = sizeof(struct vxlan_net),
3691 };
3692
3693 static int __init vxlan_init_module(void)
3694 {
3695         int rc;
3696
3697         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3698
3699         rc = register_pernet_subsys(&vxlan_net_ops);
3700         if (rc)
3701                 goto out1;
3702
3703         rc = register_netdevice_notifier(&vxlan_notifier_block);
3704         if (rc)
3705                 goto out2;
3706
3707         rc = rtnl_link_register(&vxlan_link_ops);
3708         if (rc)
3709                 goto out3;
3710
3711         return 0;
3712 out3:
3713         unregister_netdevice_notifier(&vxlan_notifier_block);
3714 out2:
3715         unregister_pernet_subsys(&vxlan_net_ops);
3716 out1:
3717         return rc;
3718 }
3719 late_initcall(vxlan_init_module);
3720
3721 static void __exit vxlan_cleanup_module(void)
3722 {
3723         rtnl_link_unregister(&vxlan_link_ops);
3724         unregister_netdevice_notifier(&vxlan_notifier_block);
3725         unregister_pernet_subsys(&vxlan_net_ops);
3726         /* rcu_barrier() is called by netns */
3727 }
3728 module_exit(vxlan_cleanup_module);
3729
3730 MODULE_LICENSE("GPL");
3731 MODULE_VERSION(VXLAN_VERSION);
3732 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3733 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3734 MODULE_ALIAS_RTNL_LINK("vxlan");