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/types.h>
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/rculist.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/in.h>
  22 #include <linux/ip.h>
  23 #include <linux/udp.h>
  24 #include <linux/igmp.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/hash.h>
  29 #include <linux/ethtool.h>
  30 #include <net/arp.h>
  31 #include <net/ndisc.h>
  32 #include <net/ip.h>
  33 #include <net/ip_tunnels.h>
  34 #include <net/icmp.h>
  35 #include <net/udp.h>
  36 #include <net/udp_tunnel.h>
  37 #include <net/rtnetlink.h>
  38 #include <net/route.h>
  39 #include <net/dsfield.h>
  40 #include <net/inet_ecn.h>
  41 #include <net/net_namespace.h>
  42 #include <net/netns/generic.h>
  43 #include <net/vxlan.h>
  44 #include <net/protocol.h>
  45 #include <net/udp_tunnel.h>
  46 #if IS_ENABLED(CONFIG_IPV6)
  47 #include <net/ipv6.h>
  48 #include <net/addrconf.h>
  49 #include <net/ip6_tunnel.h>
  50 #include <net/ip6_checksum.h>
  51 #endif
  52 #include <net/dst_metadata.h>
  53
  54 #define VXLAN_VERSION   "0.1"
  55
  56 #define PORT_HASH_BITS  8
  57 #define PORT_HASH_SIZE  (1<<PORT_HASH_BITS)
  58 #define FDB_AGE_DEFAULT 300 /* 5 min */
  59 #define FDB_AGE_INTERVAL (10 * HZ)      /* rescan interval */
  60
  61 /* UDP port for VXLAN traffic.
  62  * The IANA assigned port is 4789, but the Linux default is 8472
  63  * for compatibility with early adopters.
  64  */
  65 static unsigned short vxlan_port __read_mostly = 8472;
  66 module_param_named(udp_port, vxlan_port, ushort, 0444);
  67 MODULE_PARM_DESC(udp_port, "Destination UDP port");
  68
  69 static bool log_ecn_error = true;
  70 module_param(log_ecn_error, bool, 0644);
  71 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  72
  73 static int vxlan_net_id;
  74 static struct rtnl_link_ops vxlan_link_ops;
  75
  76 static const u8 all_zeros_mac[ETH_ALEN + 2];
  77
  78 static int vxlan_sock_add(struct vxlan_dev *vxlan);
  79
  80 /* per-network namespace private data for this module */
  81 struct vxlan_net {
  82         struct list_head  vxlan_list;
  83         struct hlist_head sock_list[PORT_HASH_SIZE];
  84         spinlock_t        sock_lock;
  85 };
  86
  87 /* Forwarding table entry */
  88 struct vxlan_fdb {
  89         struct hlist_node hlist;        /* linked list of entries */
  90         struct rcu_head   rcu;
  91         unsigned long     updated;      /* jiffies */
  92         unsigned long     used;
  93         struct list_head  remotes;
  94         u8                eth_addr[ETH_ALEN];
  95         u16               state;        /* see ndm_state */
  96         u8                flags;        /* see ndm_flags */
  97 };
  98
  99 /* salt for hash table */
 100 static u32 vxlan_salt __read_mostly;
 101 static struct workqueue_struct *vxlan_wq;
 102
 103 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
 104 {
 105         return vs->flags & VXLAN_F_COLLECT_METADATA ||
 106                ip_tunnel_collect_metadata();
 107 }
 108
 109 #if IS_ENABLED(CONFIG_IPV6)
 110 static inline
 111 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 112 {
 113         if (a->sa.sa_family != b->sa.sa_family)
 114                 return false;
 115         if (a->sa.sa_family == AF_INET6)
 116                 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
 117         else
 118                 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 119 }
 120
 121 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 122 {
 123         if (ipa->sa.sa_family == AF_INET6)
 124                 return ipv6_addr_any(&ipa->sin6.sin6_addr);
 125         else
 126                 return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 127 }
 128
 129 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 130 {
 131         if (ipa->sa.sa_family == AF_INET6)
 132                 return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
 133         else
 134                 return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 135 }
 136
 137 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 138 {
 139         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 140                 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
 141                 ip->sa.sa_family = AF_INET6;
 142                 return 0;
 143         } else if (nla_len(nla) >= sizeof(__be32)) {
 144                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 145                 ip->sa.sa_family = AF_INET;
 146                 return 0;
 147         } else {
 148                 return -EAFNOSUPPORT;
 149         }
 150 }
 151
 152 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 153                               const union vxlan_addr *ip)
 154 {
 155         if (ip->sa.sa_family == AF_INET6)
 156                 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
 157         else
 158                 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 159 }
 160
 161 #else /* !CONFIG_IPV6 */
 162
 163 static inline
 164 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
 165 {
 166         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
 167 }
 168
 169 static inline bool vxlan_addr_any(const union vxlan_addr *ipa)
 170 {
 171         return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
 172 }
 173
 174 static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
 175 {
 176         return IN_MULTICAST(ntohl(ipa->sin.sin_addr.s_addr));
 177 }
 178
 179 static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
 180 {
 181         if (nla_len(nla) >= sizeof(struct in6_addr)) {
 182                 return -EAFNOSUPPORT;
 183         } else if (nla_len(nla) >= sizeof(__be32)) {
 184                 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
 185                 ip->sa.sa_family = AF_INET;
 186                 return 0;
 187         } else {
 188                 return -EAFNOSUPPORT;
 189         }
 190 }
 191
 192 static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
 193                               const union vxlan_addr *ip)
 194 {
 195         return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
 196 }
 197 #endif
 198
 199 /* Virtual Network hash table head */
 200 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, u32 id)
 201 {
 202         return &vs->vni_list[hash_32(id, VNI_HASH_BITS)];
 203 }
 204
 205 /* Socket hash table head */
 206 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
 207 {
 208         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
 209
 210         return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
 211 }
 212
 213 /* First remote destination for a forwarding entry.
 214  * Guaranteed to be non-NULL because remotes are never deleted.
 215  */
 216 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
 217 {
 218         return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
 219 }
 220
 221 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
 222 {
 223         return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
 224 }
 225
 226 /* Find VXLAN socket based on network namespace, address family and UDP port
 227  * and enabled unshareable flags.
 228  */
 229 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
 230                                           __be16 port, u32 flags)
 231 {
 232         struct vxlan_sock *vs;
 233
 234         flags &= VXLAN_F_RCV_FLAGS;
 235
 236         hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
 237                 if (inet_sk(vs->sock->sk)->inet_sport == port &&
 238                     vxlan_get_sk_family(vs) == family &&
 239                     vs->flags == flags)
 240                         return vs;
 241         }
 242         return NULL;
 243 }
 244
 245 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
 246 {
 247         struct vxlan_dev *vxlan;
 248
 249         hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
 250                 if (vxlan->default_dst.remote_vni == id)
 251                         return vxlan;
 252         }
 253
 254         return NULL;
 255 }
 256
 257 /* Look up VNI in a per net namespace table */
 258 static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
 259                                         sa_family_t family, __be16 port,
 260                                         u32 flags)
 261 {
 262         struct vxlan_sock *vs;
 263
 264         vs = vxlan_find_sock(net, family, port, flags);
 265         if (!vs)
 266                 return NULL;
 267
 268         return vxlan_vs_find_vni(vs, id);
 269 }
 270
 271 /* Fill in neighbour message in skbuff. */
 272 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
 273                           const struct vxlan_fdb *fdb,
 274                           u32 portid, u32 seq, int type, unsigned int flags,
 275                           const struct vxlan_rdst *rdst)
 276 {
 277         unsigned long now = jiffies;
 278         struct nda_cacheinfo ci;
 279         struct nlmsghdr *nlh;
 280         struct ndmsg *ndm;
 281         bool send_ip, send_eth;
 282
 283         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
 284         if (nlh == NULL)
 285                 return -EMSGSIZE;
 286
 287         ndm = nlmsg_data(nlh);
 288         memset(ndm, 0, sizeof(*ndm));
 289
 290         send_eth = send_ip = true;
 291
 292         if (type == RTM_GETNEIGH) {
 293                 ndm->ndm_family = AF_INET;
 294                 send_ip = !vxlan_addr_any(&rdst->remote_ip);
 295                 send_eth = !is_zero_ether_addr(fdb->eth_addr);
 296         } else
 297                 ndm->ndm_family = AF_BRIDGE;
 298         ndm->ndm_state = fdb->state;
 299         ndm->ndm_ifindex = vxlan->dev->ifindex;
 300         ndm->ndm_flags = fdb->flags;
 301         ndm->ndm_type = RTN_UNICAST;
 302
 303         if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
 304             nla_put_s32(skb, NDA_LINK_NETNSID,
 305                         peernet2id_alloc(dev_net(vxlan->dev), vxlan->net)))
 306                 goto nla_put_failure;
 307
 308         if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
 309                 goto nla_put_failure;
 310
 311         if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
 312                 goto nla_put_failure;
 313
 314         if (rdst->remote_port && rdst->remote_port != vxlan->cfg.dst_port &&
 315             nla_put_be16(skb, NDA_PORT, rdst->remote_port))
 316                 goto nla_put_failure;
 317         if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
 318             nla_put_u32(skb, NDA_VNI, rdst->remote_vni))
 319                 goto nla_put_failure;
 320         if (rdst->remote_ifindex &&
 321             nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
 322                 goto nla_put_failure;
 323
 324         ci.ndm_used      = jiffies_to_clock_t(now - fdb->used);
 325         ci.ndm_confirmed = 0;
 326         ci.ndm_updated   = jiffies_to_clock_t(now - fdb->updated);
 327         ci.ndm_refcnt    = 0;
 328
 329         if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
 330                 goto nla_put_failure;
 331
 332         nlmsg_end(skb, nlh);
 333         return 0;
 334
 335 nla_put_failure:
 336         nlmsg_cancel(skb, nlh);
 337         return -EMSGSIZE;
 338 }
 339
 340 static inline size_t vxlan_nlmsg_size(void)
 341 {
 342         return NLMSG_ALIGN(sizeof(struct ndmsg))
 343                 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
 344                 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
 345                 + nla_total_size(sizeof(__be16)) /* NDA_PORT */
 346                 + nla_total_size(sizeof(__be32)) /* NDA_VNI */
 347                 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
 348                 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
 349                 + nla_total_size(sizeof(struct nda_cacheinfo));
 350 }
 351
 352 static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 353                              struct vxlan_rdst *rd, int type)
 354 {
 355         struct net *net = dev_net(vxlan->dev);
 356         struct sk_buff *skb;
 357         int err = -ENOBUFS;
 358
 359         skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
 360         if (skb == NULL)
 361                 goto errout;
 362
 363         err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
 364         if (err < 0) {
 365                 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
 366                 WARN_ON(err == -EMSGSIZE);
 367                 kfree_skb(skb);
 368                 goto errout;
 369         }
 370
 371         rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
 372         return;
 373 errout:
 374         if (err < 0)
 375                 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
 376 }
 377
 378 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
 379 {
 380         struct vxlan_dev *vxlan = netdev_priv(dev);
 381         struct vxlan_fdb f = {
 382                 .state = NUD_STALE,
 383         };
 384         struct vxlan_rdst remote = {
 385                 .remote_ip = *ipa, /* goes to NDA_DST */
 386                 .remote_vni = VXLAN_N_VID,
 387         };
 388
 389         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 390 }
 391
 392 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
 393 {
 394         struct vxlan_fdb f = {
 395                 .state = NUD_STALE,
 396         };
 397         struct vxlan_rdst remote = { };
 398
 399         memcpy(f.eth_addr, eth_addr, ETH_ALEN);
 400
 401         vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
 402 }
 403
 404 /* Hash Ethernet address */
 405 static u32 eth_hash(const unsigned char *addr)
 406 {
 407         u64 value = get_unaligned((u64 *)addr);
 408
 409         /* only want 6 bytes */
 410 #ifdef __BIG_ENDIAN
 411         value >>= 16;
 412 #else
 413         value <<= 16;
 414 #endif
 415         return hash_64(value, FDB_HASH_BITS);
 416 }
 417
 418 /* Hash chain to use given mac address */
 419 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
 420                                                 const u8 *mac)
 421 {
 422         return &vxlan->fdb_head[eth_hash(mac)];
 423 }
 424
 425 /* Look up Ethernet address in forwarding table */
 426 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
 427                                         const u8 *mac)
 428 {
 429         struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
 430         struct vxlan_fdb *f;
 431
 432         hlist_for_each_entry_rcu(f, head, hlist) {
 433                 if (ether_addr_equal(mac, f->eth_addr))
 434                         return f;
 435         }
 436
 437         return NULL;
 438 }
 439
 440 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
 441                                         const u8 *mac)
 442 {
 443         struct vxlan_fdb *f;
 444
 445         f = __vxlan_find_mac(vxlan, mac);
 446         if (f)
 447                 f->used = jiffies;
 448
 449         return f;
 450 }
 451
 452 /* caller should hold vxlan->hash_lock */
 453 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
 454                                               union vxlan_addr *ip, __be16 port,
 455                                               __u32 vni, __u32 ifindex)
 456 {
 457         struct vxlan_rdst *rd;
 458
 459         list_for_each_entry(rd, &f->remotes, list) {
 460                 if (vxlan_addr_equal(&rd->remote_ip, ip) &&
 461                     rd->remote_port == port &&
 462                     rd->remote_vni == vni &&
 463                     rd->remote_ifindex == ifindex)
 464                         return rd;
 465         }
 466
 467         return NULL;
 468 }
 469
 470 /* Replace destination of unicast mac */
 471 static int vxlan_fdb_replace(struct vxlan_fdb *f,
 472                              union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
 473 {
 474         struct vxlan_rdst *rd;
 475
 476         rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
 477         if (rd)
 478                 return 0;
 479
 480         rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
 481         if (!rd)
 482                 return 0;
 483         rd->remote_ip = *ip;
 484         rd->remote_port = port;
 485         rd->remote_vni = vni;
 486         rd->remote_ifindex = ifindex;
 487         return 1;
 488 }
 489
 490 /* Add/update destinations for multicast */
 491 static int vxlan_fdb_append(struct vxlan_fdb *f,
 492                             union vxlan_addr *ip, __be16 port, __u32 vni,
 493                             __u32 ifindex, struct vxlan_rdst **rdp)
 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 = kmalloc(sizeof(*rd), GFP_ATOMIC);
 502         if (rd == NULL)
 503                 return -ENOBUFS;
 504         rd->remote_ip = *ip;
 505         rd->remote_port = port;
 506         rd->remote_vni = vni;
 507         rd->remote_ifindex = ifindex;
 508
 509         list_add_tail_rcu(&rd->list, &f->remotes);
 510
 511         *rdp = rd;
 512         return 1;
 513 }
 514
 515 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
 516                                           unsigned int off,
 517                                           struct vxlanhdr *vh, size_t hdrlen,
 518                                           u32 data, struct gro_remcsum *grc,
 519                                           bool nopartial)
 520 {
 521         size_t start, offset;
 522
 523         if (skb->remcsum_offload)
 524                 return vh;
 525
 526         if (!NAPI_GRO_CB(skb)->csum_valid)
 527                 return NULL;
 528
 529         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
 530         offset = start + ((data & VXLAN_RCO_UDP) ?
 531                           offsetof(struct udphdr, check) :
 532                           offsetof(struct tcphdr, check));
 533
 534         vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
 535                                      start, offset, grc, nopartial);
 536
 537         skb->remcsum_offload = 1;
 538
 539         return vh;
 540 }
 541
 542 static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
 543                                           struct sk_buff *skb,
 544                                           struct udp_offload *uoff)
 545 {
 546         struct sk_buff *p, **pp = NULL;
 547         struct vxlanhdr *vh, *vh2;
 548         unsigned int hlen, off_vx;
 549         int flush = 1;
 550         struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
 551                                              udp_offloads);
 552         u32 flags;
 553         struct gro_remcsum grc;
 554
 555         skb_gro_remcsum_init(&grc);
 556
 557         off_vx = skb_gro_offset(skb);
 558         hlen = off_vx + sizeof(*vh);
 559         vh   = skb_gro_header_fast(skb, off_vx);
 560         if (skb_gro_header_hard(skb, hlen)) {
 561                 vh = skb_gro_header_slow(skb, hlen, off_vx);
 562                 if (unlikely(!vh))
 563                         goto out;
 564         }
 565
 566         skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
 567
 568         flags = ntohl(vh->vx_flags);
 569
 570         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
 571                 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
 572                                        ntohl(vh->vx_vni), &grc,
 573                                        !!(vs->flags &
 574                                           VXLAN_F_REMCSUM_NOPARTIAL));
 575
 576                 if (!vh)
 577                         goto out;
 578         }
 579
 580         skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
 581
 582         flush = 0;
 583
 584         for (p = *head; p; p = p->next) {
 585                 if (!NAPI_GRO_CB(p)->same_flow)
 586                         continue;
 587
 588                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
 589                 if (vh->vx_flags != vh2->vx_flags ||
 590                     vh->vx_vni != vh2->vx_vni) {
 591                         NAPI_GRO_CB(p)->same_flow = 0;
 592                         continue;
 593                 }
 594         }
 595
 596         pp = eth_gro_receive(head, skb);
 597
 598 out:
 599         skb_gro_remcsum_cleanup(skb, &grc);
 600         NAPI_GRO_CB(skb)->flush |= flush;
 601
 602         return pp;
 603 }
 604
 605 static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
 606                               struct udp_offload *uoff)
 607 {
 608         udp_tunnel_gro_complete(skb, nhoff);
 609
 610         return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
 611 }
 612
 613 /* Notify netdevs that UDP port started listening */
 614 static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
 615 {
 616         struct net_device *dev;
 617         struct sock *sk = vs->sock->sk;
 618         struct net *net = sock_net(sk);
 619         sa_family_t sa_family = vxlan_get_sk_family(vs);
 620         __be16 port = inet_sk(sk)->inet_sport;
 621         int err;
 622
 623         if (sa_family == AF_INET) {
 624                 err = udp_add_offload(net, &vs->udp_offloads);
 625                 if (err)
 626                         pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
 627         }
 628
 629         rcu_read_lock();
 630         for_each_netdev_rcu(net, dev) {
 631                 if (dev->netdev_ops->ndo_add_vxlan_port)
 632                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
 633                                                             port);
 634         }
 635         rcu_read_unlock();
 636 }
 637
 638 /* Notify netdevs that UDP port is no more listening */
 639 static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
 640 {
 641         struct net_device *dev;
 642         struct sock *sk = vs->sock->sk;
 643         struct net *net = sock_net(sk);
 644         sa_family_t sa_family = vxlan_get_sk_family(vs);
 645         __be16 port = inet_sk(sk)->inet_sport;
 646
 647         rcu_read_lock();
 648         for_each_netdev_rcu(net, dev) {
 649                 if (dev->netdev_ops->ndo_del_vxlan_port)
 650                         dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
 651                                                             port);
 652         }
 653         rcu_read_unlock();
 654
 655         if (sa_family == AF_INET)
 656                 udp_del_offload(&vs->udp_offloads);
 657 }
 658
 659 /* Add new entry to forwarding table -- assumes lock held */
 660 static int vxlan_fdb_create(struct vxlan_dev *vxlan,
 661                             const u8 *mac, union vxlan_addr *ip,
 662                             __u16 state, __u16 flags,
 663                             __be16 port, __u32 vni, __u32 ifindex,
 664                             __u8 ndm_flags)
 665 {
 666         struct vxlan_rdst *rd = NULL;
 667         struct vxlan_fdb *f;
 668         int notify = 0;
 669
 670         f = __vxlan_find_mac(vxlan, mac);
 671         if (f) {
 672                 if (flags & NLM_F_EXCL) {
 673                         netdev_dbg(vxlan->dev,
 674                                    "lost race to create %pM\n", mac);
 675                         return -EEXIST;
 676                 }
 677                 if (f->state != state) {
 678                         f->state = state;
 679                         f->updated = jiffies;
 680                         notify = 1;
 681                 }
 682                 if (f->flags != ndm_flags) {
 683                         f->flags = ndm_flags;
 684                         f->updated = jiffies;
 685                         notify = 1;
 686                 }
 687                 if ((flags & NLM_F_REPLACE)) {
 688                         /* Only change unicasts */
 689                         if (!(is_multicast_ether_addr(f->eth_addr) ||
 690                              is_zero_ether_addr(f->eth_addr))) {
 691                                 notify |= vxlan_fdb_replace(f, ip, port, vni,
 692                                                            ifindex);
 693                         } else
 694                                 return -EOPNOTSUPP;
 695                 }
 696                 if ((flags & NLM_F_APPEND) &&
 697                     (is_multicast_ether_addr(f->eth_addr) ||
 698                      is_zero_ether_addr(f->eth_addr))) {
 699                         int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
 700                                                   &rd);
 701
 702                         if (rc < 0)
 703                                 return rc;
 704                         notify |= rc;
 705                 }
 706         } else {
 707                 if (!(flags & NLM_F_CREATE))
 708                         return -ENOENT;
 709
 710                 if (vxlan->cfg.addrmax &&
 711                     vxlan->addrcnt >= vxlan->cfg.addrmax)
 712                         return -ENOSPC;
 713
 714                 /* Disallow replace to add a multicast entry */
 715                 if ((flags & NLM_F_REPLACE) &&
 716                     (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
 717                         return -EOPNOTSUPP;
 718
 719                 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
 720                 f = kmalloc(sizeof(*f), GFP_ATOMIC);
 721                 if (!f)
 722                         return -ENOMEM;
 723
 724                 notify = 1;
 725                 f->state = state;
 726                 f->flags = ndm_flags;
 727                 f->updated = f->used = jiffies;
 728                 INIT_LIST_HEAD(&f->remotes);
 729                 memcpy(f->eth_addr, mac, ETH_ALEN);
 730
 731                 vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
 732
 733                 ++vxlan->addrcnt;
 734                 hlist_add_head_rcu(&f->hlist,
 735                                    vxlan_fdb_head(vxlan, mac));
 736         }
 737
 738         if (notify) {
 739                 if (rd == NULL)
 740                         rd = first_remote_rtnl(f);
 741                 vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
 742         }
 743
 744         return 0;
 745 }
 746
 747 static void vxlan_fdb_free(struct rcu_head *head)
 748 {
 749         struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
 750         struct vxlan_rdst *rd, *nd;
 751
 752         list_for_each_entry_safe(rd, nd, &f->remotes, list)
 753                 kfree(rd);
 754         kfree(f);
 755 }
 756
 757 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
 758 {
 759         netdev_dbg(vxlan->dev,
 760                     "delete %pM\n", f->eth_addr);
 761
 762         --vxlan->addrcnt;
 763         vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
 764
 765         hlist_del_rcu(&f->hlist);
 766         call_rcu(&f->rcu, vxlan_fdb_free);
 767 }
 768
 769 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
 770                            union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
 771 {
 772         struct net *net = dev_net(vxlan->dev);
 773         int err;
 774
 775         if (tb[NDA_DST]) {
 776                 err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
 777                 if (err)
 778                         return err;
 779         } else {
 780                 union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
 781                 if (remote->sa.sa_family == AF_INET) {
 782                         ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
 783                         ip->sa.sa_family = AF_INET;
 784 #if IS_ENABLED(CONFIG_IPV6)
 785                 } else {
 786                         ip->sin6.sin6_addr = in6addr_any;
 787                         ip->sa.sa_family = AF_INET6;
 788 #endif
 789                 }
 790         }
 791
 792         if (tb[NDA_PORT]) {
 793                 if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
 794                         return -EINVAL;
 795                 *port = nla_get_be16(tb[NDA_PORT]);
 796         } else {
 797                 *port = vxlan->cfg.dst_port;
 798         }
 799
 800         if (tb[NDA_VNI]) {
 801                 if (nla_len(tb[NDA_VNI]) != sizeof(u32))
 802                         return -EINVAL;
 803                 *vni = nla_get_u32(tb[NDA_VNI]);
 804         } else {
 805                 *vni = vxlan->default_dst.remote_vni;
 806         }
 807
 808         if (tb[NDA_IFINDEX]) {
 809                 struct net_device *tdev;
 810
 811                 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
 812                         return -EINVAL;
 813                 *ifindex = nla_get_u32(tb[NDA_IFINDEX]);
 814                 tdev = __dev_get_by_index(net, *ifindex);
 815                 if (!tdev)
 816                         return -EADDRNOTAVAIL;
 817         } else {
 818                 *ifindex = 0;
 819         }
 820
 821         return 0;
 822 }
 823
 824 /* Add static entry (via netlink) */
 825 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 826                          struct net_device *dev,
 827                          const unsigned char *addr, u16 vid, u16 flags)
 828 {
 829         struct vxlan_dev *vxlan = netdev_priv(dev);
 830         /* struct net *net = dev_net(vxlan->dev); */
 831         union vxlan_addr ip;
 832         __be16 port;
 833         u32 vni, ifindex;
 834         int err;
 835
 836         if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
 837                 pr_info("RTM_NEWNEIGH with invalid state %#x\n",
 838                         ndm->ndm_state);
 839                 return -EINVAL;
 840         }
 841
 842         if (tb[NDA_DST] == NULL)
 843                 return -EINVAL;
 844
 845         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 846         if (err)
 847                 return err;
 848
 849         if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
 850                 return -EAFNOSUPPORT;
 851
 852         spin_lock_bh(&vxlan->hash_lock);
 853         err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
 854                                port, vni, ifindex, ndm->ndm_flags);
 855         spin_unlock_bh(&vxlan->hash_lock);
 856
 857         return err;
 858 }
 859
 860 /* Delete entry (via netlink) */
 861 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 862                             struct net_device *dev,
 863                             const unsigned char *addr, u16 vid)
 864 {
 865         struct vxlan_dev *vxlan = netdev_priv(dev);
 866         struct vxlan_fdb *f;
 867         struct vxlan_rdst *rd = NULL;
 868         union vxlan_addr ip;
 869         __be16 port;
 870         u32 vni, ifindex;
 871         int err;
 872
 873         err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
 874         if (err)
 875                 return err;
 876
 877         err = -ENOENT;
 878
 879         spin_lock_bh(&vxlan->hash_lock);
 880         f = vxlan_find_mac(vxlan, addr);
 881         if (!f)
 882                 goto out;
 883
 884         if (!vxlan_addr_any(&ip)) {
 885                 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
 886                 if (!rd)
 887                         goto out;
 888         }
 889
 890         err = 0;
 891
 892         /* remove a destination if it's not the only one on the list,
 893          * otherwise destroy the fdb entry
 894          */
 895         if (rd && !list_is_singular(&f->remotes)) {
 896                 list_del_rcu(&rd->list);
 897                 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
 898                 kfree_rcu(rd, rcu);
 899                 goto out;
 900         }
 901
 902         vxlan_fdb_destroy(vxlan, f);
 903
 904 out:
 905         spin_unlock_bh(&vxlan->hash_lock);
 906
 907         return err;
 908 }
 909
 910 /* Dump forwarding table */
 911 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 912                           struct net_device *dev,
 913                           struct net_device *filter_dev, int idx)
 914 {
 915         struct vxlan_dev *vxlan = netdev_priv(dev);
 916         unsigned int h;
 917
 918         for (h = 0; h < FDB_HASH_SIZE; ++h) {
 919                 struct vxlan_fdb *f;
 920                 int err;
 921
 922                 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 923                         struct vxlan_rdst *rd;
 924
 925                         list_for_each_entry_rcu(rd, &f->remotes, list) {
 926                                 if (idx < cb->args[0])
 927                                         goto skip;
 928
 929                                 err = vxlan_fdb_info(skb, vxlan, f,
 930                                                      NETLINK_CB(cb->skb).portid,
 931                                                      cb->nlh->nlmsg_seq,
 932                                                      RTM_NEWNEIGH,
 933                                                      NLM_F_MULTI, rd);
 934                                 if (err < 0) {
 935                                         cb->args[1] = err;
 936                                         goto out;
 937                                 }
 938 skip:
 939                                 ++idx;
 940                         }
 941                 }
 942         }
 943 out:
 944         return idx;
 945 }
 946
 947 /* Watch incoming packets to learn mapping between Ethernet address
 948  * and Tunnel endpoint.
 949  * Return true if packet is bogus and should be dropped.
 950  */
 951 static bool vxlan_snoop(struct net_device *dev,
 952                         union vxlan_addr *src_ip, const u8 *src_mac)
 953 {
 954         struct vxlan_dev *vxlan = netdev_priv(dev);
 955         struct vxlan_fdb *f;
 956
 957         f = vxlan_find_mac(vxlan, src_mac);
 958         if (likely(f)) {
 959                 struct vxlan_rdst *rdst = first_remote_rcu(f);
 960
 961                 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
 962                         return false;
 963
 964                 /* Don't migrate static entries, drop packets */
 965                 if (f->state & NUD_NOARP)
 966                         return true;
 967
 968                 if (net_ratelimit())
 969                         netdev_info(dev,
 970                                     "%pM migrated from %pIS to %pIS\n",
 971                                     src_mac, &rdst->remote_ip.sa, &src_ip->sa);
 972
 973                 rdst->remote_ip = *src_ip;
 974                 f->updated = jiffies;
 975                 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH);
 976         } else {
 977                 /* learned new entry */
 978                 spin_lock(&vxlan->hash_lock);
 979
 980                 /* close off race between vxlan_flush and incoming packets */
 981                 if (netif_running(dev))
 982                         vxlan_fdb_create(vxlan, src_mac, src_ip,
 983                                          NUD_REACHABLE,
 984                                          NLM_F_EXCL|NLM_F_CREATE,
 985                                          vxlan->cfg.dst_port,
 986                                          vxlan->default_dst.remote_vni,
 987                                          0, NTF_SELF);
 988                 spin_unlock(&vxlan->hash_lock);
 989         }
 990
 991         return false;
 992 }
 993
 994 /* See if multicast group is already in use by other ID */
 995 static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
 996 {
 997         struct vxlan_dev *vxlan;
 998         unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
 999
1000         /* The vxlan_sock is only used by dev, leaving group has
1001          * no effect on other vxlan devices.
1002          */
1003         if (family == AF_INET && dev->vn4_sock &&
1004             atomic_read(&dev->vn4_sock->refcnt) == 1)
1005                 return false;
1006 #if IS_ENABLED(CONFIG_IPV6)
1007         if (family == AF_INET6 && dev->vn6_sock &&
1008             atomic_read(&dev->vn6_sock->refcnt) == 1)
1009                 return false;
1010 #endif
1011
1012         list_for_each_entry(vxlan, &vn->vxlan_list, next) {
1013                 if (!netif_running(vxlan->dev) || vxlan == dev)
1014                         continue;
1015
1016                 if (family == AF_INET && vxlan->vn4_sock != dev->vn4_sock)
1017                         continue;
1018 #if IS_ENABLED(CONFIG_IPV6)
1019                 if (family == AF_INET6 && vxlan->vn6_sock != dev->vn6_sock)
1020                         continue;
1021 #endif
1022
1023                 if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
1024                                       &dev->default_dst.remote_ip))
1025                         continue;
1026
1027                 if (vxlan->default_dst.remote_ifindex !=
1028                     dev->default_dst.remote_ifindex)
1029                         continue;
1030
1031                 return true;
1032         }
1033
1034         return false;
1035 }
1036
1037 static void __vxlan_sock_release(struct vxlan_sock *vs)
1038 {
1039         struct vxlan_net *vn;
1040
1041         if (!vs)
1042                 return;
1043         if (!atomic_dec_and_test(&vs->refcnt))
1044                 return;
1045
1046         vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
1047         spin_lock(&vn->sock_lock);
1048         hlist_del_rcu(&vs->hlist);
1049         vxlan_notify_del_rx_port(vs);
1050         spin_unlock(&vn->sock_lock);
1051
1052         queue_work(vxlan_wq, &vs->del_work);
1053 }
1054
1055 static void vxlan_sock_release(struct vxlan_dev *vxlan)
1056 {
1057         __vxlan_sock_release(vxlan->vn4_sock);
1058 #if IS_ENABLED(CONFIG_IPV6)
1059         __vxlan_sock_release(vxlan->vn6_sock);
1060 #endif
1061 }
1062
1063 /* Update multicast group membership when first VNI on
1064  * multicast address is brought up
1065  */
1066 static int vxlan_igmp_join(struct vxlan_dev *vxlan)
1067 {
1068         struct sock *sk;
1069         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1070         int ifindex = vxlan->default_dst.remote_ifindex;
1071         int ret = -EINVAL;
1072
1073         if (ip->sa.sa_family == AF_INET) {
1074                 struct ip_mreqn mreq = {
1075                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1076                         .imr_ifindex            = ifindex,
1077                 };
1078
1079                 sk = vxlan->vn4_sock->sock->sk;
1080                 lock_sock(sk);
1081                 ret = ip_mc_join_group(sk, &mreq);
1082                 release_sock(sk);
1083 #if IS_ENABLED(CONFIG_IPV6)
1084         } else {
1085                 sk = vxlan->vn6_sock->sock->sk;
1086                 lock_sock(sk);
1087                 ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
1088                                                    &ip->sin6.sin6_addr);
1089                 release_sock(sk);
1090 #endif
1091         }
1092
1093         return ret;
1094 }
1095
1096 /* Inverse of vxlan_igmp_join when last VNI is brought down */
1097 static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
1098 {
1099         struct sock *sk;
1100         union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
1101         int ifindex = vxlan->default_dst.remote_ifindex;
1102         int ret = -EINVAL;
1103
1104         if (ip->sa.sa_family == AF_INET) {
1105                 struct ip_mreqn mreq = {
1106                         .imr_multiaddr.s_addr   = ip->sin.sin_addr.s_addr,
1107                         .imr_ifindex            = ifindex,
1108                 };
1109
1110                 sk = vxlan->vn4_sock->sock->sk;
1111                 lock_sock(sk);
1112                 ret = ip_mc_leave_group(sk, &mreq);
1113                 release_sock(sk);
1114 #if IS_ENABLED(CONFIG_IPV6)
1115         } else {
1116                 sk = vxlan->vn6_sock->sock->sk;
1117                 lock_sock(sk);
1118                 ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
1119                                                    &ip->sin6.sin6_addr);
1120                 release_sock(sk);
1121 #endif
1122         }
1123
1124         return ret;
1125 }
1126
1127 static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
1128                                       size_t hdrlen, u32 data, bool nopartial)
1129 {
1130         size_t start, offset, plen;
1131
1132         if (skb->remcsum_offload)
1133                 return vh;
1134
1135         start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
1136         offset = start + ((data & VXLAN_RCO_UDP) ?
1137                           offsetof(struct udphdr, check) :
1138                           offsetof(struct tcphdr, check));
1139
1140         plen = hdrlen + offset + sizeof(u16);
1141
1142         if (!pskb_may_pull(skb, plen))
1143                 return NULL;
1144
1145         vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1146
1147         skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
1148                             nopartial);
1149
1150         return vh;
1151 }
1152
1153 static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
1154                       struct vxlan_metadata *md, u32 vni,
1155                       struct metadata_dst *tun_dst)
1156 {
1157         struct iphdr *oip = NULL;
1158         struct ipv6hdr *oip6 = NULL;
1159         struct vxlan_dev *vxlan;
1160         struct pcpu_sw_netstats *stats;
1161         union vxlan_addr saddr;
1162         int err = 0;
1163
1164         /* For flow based devices, map all packets to VNI 0 */
1165         if (vs->flags & VXLAN_F_COLLECT_METADATA)
1166                 vni = 0;
1167
1168         /* Is this VNI defined? */
1169         vxlan = vxlan_vs_find_vni(vs, vni);
1170         if (!vxlan)
1171                 goto drop;
1172
1173         skb_reset_mac_header(skb);
1174         skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
1175         skb->protocol = eth_type_trans(skb, vxlan->dev);
1176         skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1177
1178         /* Ignore packet loops (and multicast echo) */
1179         if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
1180                 goto drop;
1181
1182         /* Get data from the outer IP header */
1183         if (vxlan_get_sk_family(vs) == AF_INET) {
1184                 oip = ip_hdr(skb);
1185                 saddr.sin.sin_addr.s_addr = oip->saddr;
1186                 saddr.sa.sa_family = AF_INET;
1187 #if IS_ENABLED(CONFIG_IPV6)
1188         } else {
1189                 oip6 = ipv6_hdr(skb);
1190                 saddr.sin6.sin6_addr = oip6->saddr;
1191                 saddr.sa.sa_family = AF_INET6;
1192 #endif
1193         }
1194
1195         if (tun_dst) {
1196                 skb_dst_set(skb, (struct dst_entry *)tun_dst);
1197                 tun_dst = NULL;
1198         }
1199
1200         if ((vxlan->flags & VXLAN_F_LEARN) &&
1201             vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
1202                 goto drop;
1203
1204         skb_reset_network_header(skb);
1205         /* In flow-based mode, GBP is carried in dst_metadata */
1206         if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
1207                 skb->mark = md->gbp;
1208
1209         if (oip6)
1210                 err = IP6_ECN_decapsulate(oip6, skb);
1211         if (oip)
1212                 err = IP_ECN_decapsulate(oip, skb);
1213
1214         if (unlikely(err)) {
1215                 if (log_ecn_error) {
1216                         if (oip6)
1217                                 net_info_ratelimited("non-ECT from %pI6\n",
1218                                                      &oip6->saddr);
1219                         if (oip)
1220                                 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
1221                                                      &oip->saddr, oip->tos);
1222                 }
1223                 if (err > 1) {
1224                         ++vxlan->dev->stats.rx_frame_errors;
1225                         ++vxlan->dev->stats.rx_errors;
1226                         goto drop;
1227                 }
1228         }
1229
1230         stats = this_cpu_ptr(vxlan->dev->tstats);
1231         u64_stats_update_begin(&stats->syncp);
1232         stats->rx_packets++;
1233         stats->rx_bytes += skb->len;
1234         u64_stats_update_end(&stats->syncp);
1235
1236         gro_cells_receive(&vxlan->gro_cells, skb);
1237
1238         return;
1239 drop:
1240         if (tun_dst)
1241                 dst_release((struct dst_entry *)tun_dst);
1242
1243         /* Consume bad packet */
1244         kfree_skb(skb);
1245 }
1246
1247 /* Callback from net/ipv4/udp.c to receive packets */
1248 static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
1249 {
1250         struct metadata_dst *tun_dst = NULL;
1251         struct vxlan_sock *vs;
1252         struct vxlanhdr *vxh;
1253         u32 flags, vni;
1254         struct vxlan_metadata _md;
1255         struct vxlan_metadata *md = &_md;
1256
1257         /* Need Vxlan and inner Ethernet header to be present */
1258         if (!pskb_may_pull(skb, VXLAN_HLEN))
1259                 goto error;
1260
1261         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1262         flags = ntohl(vxh->vx_flags);
1263         vni = ntohl(vxh->vx_vni);
1264
1265         if (flags & VXLAN_HF_VNI) {
1266                 flags &= ~VXLAN_HF_VNI;
1267         } else {
1268                 /* VNI flag always required to be set */
1269                 goto bad_flags;
1270         }
1271
1272         if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
1273                 goto drop;
1274         vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
1275
1276         vs = rcu_dereference_sk_user_data(sk);
1277         if (!vs)
1278                 goto drop;
1279
1280         if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
1281                 vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
1282                                     !!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
1283                 if (!vxh)
1284                         goto drop;
1285
1286                 flags &= ~VXLAN_HF_RCO;
1287                 vni &= VXLAN_VNI_MASK;
1288         }
1289
1290         if (vxlan_collect_metadata(vs)) {
1291                 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
1292                                          cpu_to_be64(vni >> 8), sizeof(*md));
1293
1294                 if (!tun_dst)
1295                         goto drop;
1296
1297                 md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
1298         } else {
1299                 memset(md, 0, sizeof(*md));
1300         }
1301
1302         /* For backwards compatibility, only allow reserved fields to be
1303          * used by VXLAN extensions if explicitly requested.
1304          */
1305         if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
1306                 struct vxlanhdr_gbp *gbp;
1307
1308                 gbp = (struct vxlanhdr_gbp *)vxh;
1309                 md->gbp = ntohs(gbp->policy_id);
1310
1311                 if (tun_dst) {
1312                         tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
1313                         tun_dst->u.tun_info.options_len = sizeof(*md);
1314                 }
1315
1316                 if (gbp->dont_learn)
1317                         md->gbp |= VXLAN_GBP_DONT_LEARN;
1318
1319                 if (gbp->policy_applied)
1320                         md->gbp |= VXLAN_GBP_POLICY_APPLIED;
1321
1322                 flags &= ~VXLAN_GBP_USED_BITS;
1323         }
1324
1325         if (flags || vni & ~VXLAN_VNI_MASK) {
1326                 /* If there are any unprocessed flags remaining treat
1327                  * this as a malformed packet. This behavior diverges from
1328                  * VXLAN RFC (RFC7348) which stipulates that bits in reserved
1329                  * in reserved fields are to be ignored. The approach here
1330                  * maintains compatibility with previous stack code, and also
1331                  * is more robust and provides a little more security in
1332                  * adding extensions to VXLAN.
1333                  */
1334
1335                 goto bad_flags;
1336         }
1337
1338         vxlan_rcv(vs, skb, md, vni >> 8, tun_dst);
1339         return 0;
1340
1341 drop:
1342         /* Consume bad packet */
1343         kfree_skb(skb);
1344         return 0;
1345
1346 bad_flags:
1347         netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
1348                    ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
1349
1350 error:
1351         if (tun_dst)
1352                 dst_release((struct dst_entry *)tun_dst);
1353
1354         /* Return non vxlan pkt */
1355         return 1;
1356 }
1357
1358 static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
1359 {
1360         struct vxlan_dev *vxlan = netdev_priv(dev);
1361         struct arphdr *parp;
1362         u8 *arpptr, *sha;
1363         __be32 sip, tip;
1364         struct neighbour *n;
1365
1366         if (dev->flags & IFF_NOARP)
1367                 goto out;
1368
1369         if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
1370                 dev->stats.tx_dropped++;
1371                 goto out;
1372         }
1373         parp = arp_hdr(skb);
1374
1375         if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
1376              parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
1377             parp->ar_pro != htons(ETH_P_IP) ||
1378             parp->ar_op != htons(ARPOP_REQUEST) ||
1379             parp->ar_hln != dev->addr_len ||
1380             parp->ar_pln != 4)
1381                 goto out;
1382         arpptr = (u8 *)parp + sizeof(struct arphdr);
1383         sha = arpptr;
1384         arpptr += dev->addr_len;        /* sha */
1385         memcpy(&sip, arpptr, sizeof(sip));
1386         arpptr += sizeof(sip);
1387         arpptr += dev->addr_len;        /* tha */
1388         memcpy(&tip, arpptr, sizeof(tip));
1389
1390         if (ipv4_is_loopback(tip) ||
1391             ipv4_is_multicast(tip))
1392                 goto out;
1393
1394         n = neigh_lookup(&arp_tbl, &tip, dev);
1395
1396         if (n) {
1397                 struct vxlan_fdb *f;
1398                 struct sk_buff  *reply;
1399
1400                 if (!(n->nud_state & NUD_CONNECTED)) {
1401                         neigh_release(n);
1402                         goto out;
1403                 }
1404
1405                 f = vxlan_find_mac(vxlan, n->ha);
1406                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1407                         /* bridge-local neighbor */
1408                         neigh_release(n);
1409                         goto out;
1410                 }
1411
1412                 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
1413                                 n->ha, sha);
1414
1415                 neigh_release(n);
1416
1417                 if (reply == NULL)
1418                         goto out;
1419
1420                 skb_reset_mac_header(reply);
1421                 __skb_pull(reply, skb_network_offset(reply));
1422                 reply->ip_summed = CHECKSUM_UNNECESSARY;
1423                 reply->pkt_type = PACKET_HOST;
1424
1425                 if (netif_rx_ni(reply) == NET_RX_DROP)
1426                         dev->stats.rx_dropped++;
1427         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1428                 union vxlan_addr ipa = {
1429                         .sin.sin_addr.s_addr = tip,
1430                         .sin.sin_family = AF_INET,
1431                 };
1432
1433                 vxlan_ip_miss(dev, &ipa);
1434         }
1435 out:
1436         consume_skb(skb);
1437         return NETDEV_TX_OK;
1438 }
1439
1440 #if IS_ENABLED(CONFIG_IPV6)
1441 static struct sk_buff *vxlan_na_create(struct sk_buff *request,
1442         struct neighbour *n, bool isrouter)
1443 {
1444         struct net_device *dev = request->dev;
1445         struct sk_buff *reply;
1446         struct nd_msg *ns, *na;
1447         struct ipv6hdr *pip6;
1448         u8 *daddr;
1449         int na_olen = 8; /* opt hdr + ETH_ALEN for target */
1450         int ns_olen;
1451         int i, len;
1452
1453         if (dev == NULL)
1454                 return NULL;
1455
1456         len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
1457                 sizeof(*na) + na_olen + dev->needed_tailroom;
1458         reply = alloc_skb(len, GFP_ATOMIC);
1459         if (reply == NULL)
1460                 return NULL;
1461
1462         reply->protocol = htons(ETH_P_IPV6);
1463         reply->dev = dev;
1464         skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
1465         skb_push(reply, sizeof(struct ethhdr));
1466         skb_set_mac_header(reply, 0);
1467
1468         ns = (struct nd_msg *)skb_transport_header(request);
1469
1470         daddr = eth_hdr(request)->h_source;
1471         ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
1472         for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
1473                 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
1474                         daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
1475                         break;
1476                 }
1477         }
1478
1479         /* Ethernet header */
1480         ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
1481         ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
1482         eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
1483         reply->protocol = htons(ETH_P_IPV6);
1484
1485         skb_pull(reply, sizeof(struct ethhdr));
1486         skb_set_network_header(reply, 0);
1487         skb_put(reply, sizeof(struct ipv6hdr));
1488
1489         /* IPv6 header */
1490
1491         pip6 = ipv6_hdr(reply);
1492         memset(pip6, 0, sizeof(struct ipv6hdr));
1493         pip6->version = 6;
1494         pip6->priority = ipv6_hdr(request)->priority;
1495         pip6->nexthdr = IPPROTO_ICMPV6;
1496         pip6->hop_limit = 255;
1497         pip6->daddr = ipv6_hdr(request)->saddr;
1498         pip6->saddr = *(struct in6_addr *)n->primary_key;
1499
1500         skb_pull(reply, sizeof(struct ipv6hdr));
1501         skb_set_transport_header(reply, 0);
1502
1503         na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
1504
1505         /* Neighbor Advertisement */
1506         memset(na, 0, sizeof(*na)+na_olen);
1507         na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
1508         na->icmph.icmp6_router = isrouter;
1509         na->icmph.icmp6_override = 1;
1510         na->icmph.icmp6_solicited = 1;
1511         na->target = ns->target;
1512         ether_addr_copy(&na->opt[2], n->ha);
1513         na->opt[0] = ND_OPT_TARGET_LL_ADDR;
1514         na->opt[1] = na_olen >> 3;
1515
1516         na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
1517                 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
1518                 csum_partial(na, sizeof(*na)+na_olen, 0));
1519
1520         pip6->payload_len = htons(sizeof(*na)+na_olen);
1521
1522         skb_push(reply, sizeof(struct ipv6hdr));
1523
1524         reply->ip_summed = CHECKSUM_UNNECESSARY;
1525
1526         return reply;
1527 }
1528
1529 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb)
1530 {
1531         struct vxlan_dev *vxlan = netdev_priv(dev);
1532         struct nd_msg *msg;
1533         const struct ipv6hdr *iphdr;
1534         const struct in6_addr *saddr, *daddr;
1535         struct neighbour *n;
1536         struct inet6_dev *in6_dev;
1537
1538         in6_dev = __in6_dev_get(dev);
1539         if (!in6_dev)
1540                 goto out;
1541
1542         iphdr = ipv6_hdr(skb);
1543         saddr = &iphdr->saddr;
1544         daddr = &iphdr->daddr;
1545
1546         msg = (struct nd_msg *)skb_transport_header(skb);
1547         if (msg->icmph.icmp6_code != 0 ||
1548             msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
1549                 goto out;
1550
1551         if (ipv6_addr_loopback(daddr) ||
1552             ipv6_addr_is_multicast(&msg->target))
1553                 goto out;
1554
1555         n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
1556
1557         if (n) {
1558                 struct vxlan_fdb *f;
1559                 struct sk_buff *reply;
1560
1561                 if (!(n->nud_state & NUD_CONNECTED)) {
1562                         neigh_release(n);
1563                         goto out;
1564                 }
1565
1566                 f = vxlan_find_mac(vxlan, n->ha);
1567                 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
1568                         /* bridge-local neighbor */
1569                         neigh_release(n);
1570                         goto out;
1571                 }
1572
1573                 reply = vxlan_na_create(skb, n,
1574                                         !!(f ? f->flags & NTF_ROUTER : 0));
1575
1576                 neigh_release(n);
1577
1578                 if (reply == NULL)
1579                         goto out;
1580
1581                 if (netif_rx_ni(reply) == NET_RX_DROP)
1582                         dev->stats.rx_dropped++;
1583
1584         } else if (vxlan->flags & VXLAN_F_L3MISS) {
1585                 union vxlan_addr ipa = {
1586                         .sin6.sin6_addr = msg->target,
1587                         .sin6.sin6_family = AF_INET6,
1588                 };
1589
1590                 vxlan_ip_miss(dev, &ipa);
1591         }
1592
1593 out:
1594         consume_skb(skb);
1595         return NETDEV_TX_OK;
1596 }
1597 #endif
1598
1599 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
1600 {
1601         struct vxlan_dev *vxlan = netdev_priv(dev);
1602         struct neighbour *n;
1603
1604         if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
1605                 return false;
1606
1607         n = NULL;
1608         switch (ntohs(eth_hdr(skb)->h_proto)) {
1609         case ETH_P_IP:
1610         {
1611                 struct iphdr *pip;
1612
1613                 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1614                         return false;
1615                 pip = ip_hdr(skb);
1616                 n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
1617                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1618                         union vxlan_addr ipa = {
1619                                 .sin.sin_addr.s_addr = pip->daddr,
1620                                 .sin.sin_family = AF_INET,
1621                         };
1622
1623                         vxlan_ip_miss(dev, &ipa);
1624                         return false;
1625                 }
1626
1627                 break;
1628         }
1629 #if IS_ENABLED(CONFIG_IPV6)
1630         case ETH_P_IPV6:
1631         {
1632                 struct ipv6hdr *pip6;
1633
1634                 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
1635                         return false;
1636                 pip6 = ipv6_hdr(skb);
1637                 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
1638                 if (!n && (vxlan->flags & VXLAN_F_L3MISS)) {
1639                         union vxlan_addr ipa = {
1640                                 .sin6.sin6_addr = pip6->daddr,
1641                                 .sin6.sin6_family = AF_INET6,
1642                         };
1643
1644                         vxlan_ip_miss(dev, &ipa);
1645                         return false;
1646                 }
1647
1648                 break;
1649         }
1650 #endif
1651         default:
1652                 return false;
1653         }
1654
1655         if (n) {
1656                 bool diff;
1657
1658                 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
1659                 if (diff) {
1660                         memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
1661                                 dev->addr_len);
1662                         memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
1663                 }
1664                 neigh_release(n);
1665                 return diff;
1666         }
1667
1668         return false;
1669 }
1670
1671 static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
1672                                 struct vxlan_metadata *md)
1673 {
1674         struct vxlanhdr_gbp *gbp;
1675
1676         if (!md->gbp)
1677                 return;
1678
1679         gbp = (struct vxlanhdr_gbp *)vxh;
1680         vxh->vx_flags |= htonl(VXLAN_HF_GBP);
1681
1682         if (md->gbp & VXLAN_GBP_DONT_LEARN)
1683                 gbp->dont_learn = 1;
1684
1685         if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
1686                 gbp->policy_applied = 1;
1687
1688         gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
1689 }
1690
1691 #if IS_ENABLED(CONFIG_IPV6)
1692 static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
1693                            struct sk_buff *skb,
1694                            struct net_device *dev, struct in6_addr *saddr,
1695                            struct in6_addr *daddr, __u8 prio, __u8 ttl,
1696                            __be16 src_port, __be16 dst_port, __be32 vni,
1697                            struct vxlan_metadata *md, bool xnet, u32 vxflags)
1698 {
1699         struct vxlanhdr *vxh;
1700         int min_headroom;
1701         int err;
1702         bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
1703         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1704         u16 hdrlen = sizeof(struct vxlanhdr);
1705
1706         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1707             skb->ip_summed == CHECKSUM_PARTIAL) {
1708                 int csum_start = skb_checksum_start_offset(skb);
1709
1710                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1711                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1712                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1713                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1714                         udp_sum = false;
1715                         type |= SKB_GSO_TUNNEL_REMCSUM;
1716                 }
1717         }
1718
1719         skb_scrub_packet(skb, xnet);
1720
1721         min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
1722                         + VXLAN_HLEN + sizeof(struct ipv6hdr)
1723                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1724
1725         /* Need space for new headers (invalidates iph ptr) */
1726         err = skb_cow_head(skb, min_headroom);
1727         if (unlikely(err)) {
1728                 kfree_skb(skb);
1729                 goto err;
1730         }
1731
1732         skb = vlan_hwaccel_push_inside(skb);
1733         if (WARN_ON(!skb)) {
1734                 err = -ENOMEM;
1735                 goto err;
1736         }
1737
1738         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1739         if (IS_ERR(skb)) {
1740                 err = -EINVAL;
1741                 goto err;
1742         }
1743
1744         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1745         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1746         vxh->vx_vni = vni;
1747
1748         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1749                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1750                            VXLAN_RCO_SHIFT;
1751
1752                 if (skb->csum_offset == offsetof(struct udphdr, check))
1753                         data |= VXLAN_RCO_UDP;
1754
1755                 vxh->vx_vni |= htonl(data);
1756                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1757
1758                 if (!skb_is_gso(skb)) {
1759                         skb->ip_summed = CHECKSUM_NONE;
1760                         skb->encapsulation = 0;
1761                 }
1762         }
1763
1764         if (vxflags & VXLAN_F_GBP)
1765                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1766
1767         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1768
1769         udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
1770                              ttl, src_port, dst_port,
1771                              !!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
1772         return 0;
1773 err:
1774         dst_release(dst);
1775         return err;
1776 }
1777 #endif
1778
1779 static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
1780                           __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
1781                           __be16 src_port, __be16 dst_port, __be32 vni,
1782                           struct vxlan_metadata *md, bool xnet, u32 vxflags)
1783 {
1784         struct vxlanhdr *vxh;
1785         int min_headroom;
1786         int err;
1787         bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
1788         int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
1789         u16 hdrlen = sizeof(struct vxlanhdr);
1790
1791         if ((vxflags & VXLAN_F_REMCSUM_TX) &&
1792             skb->ip_summed == CHECKSUM_PARTIAL) {
1793                 int csum_start = skb_checksum_start_offset(skb);
1794
1795                 if (csum_start <= VXLAN_MAX_REMCSUM_START &&
1796                     !(csum_start & VXLAN_RCO_SHIFT_MASK) &&
1797                     (skb->csum_offset == offsetof(struct udphdr, check) ||
1798                      skb->csum_offset == offsetof(struct tcphdr, check))) {
1799                         udp_sum = false;
1800                         type |= SKB_GSO_TUNNEL_REMCSUM;
1801                 }
1802         }
1803
1804         min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
1805                         + VXLAN_HLEN + sizeof(struct iphdr)
1806                         + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
1807
1808         /* Need space for new headers (invalidates iph ptr) */
1809         err = skb_cow_head(skb, min_headroom);
1810         if (unlikely(err)) {
1811                 kfree_skb(skb);
1812                 return err;
1813         }
1814
1815         skb = vlan_hwaccel_push_inside(skb);
1816         if (WARN_ON(!skb))
1817                 return -ENOMEM;
1818
1819         skb = iptunnel_handle_offloads(skb, udp_sum, type);
1820         if (IS_ERR(skb))
1821                 return PTR_ERR(skb);
1822
1823         vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
1824         vxh->vx_flags = htonl(VXLAN_HF_VNI);
1825         vxh->vx_vni = vni;
1826
1827         if (type & SKB_GSO_TUNNEL_REMCSUM) {
1828                 u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
1829                            VXLAN_RCO_SHIFT;
1830
1831                 if (skb->csum_offset == offsetof(struct udphdr, check))
1832                         data |= VXLAN_RCO_UDP;
1833
1834                 vxh->vx_vni |= htonl(data);
1835                 vxh->vx_flags |= htonl(VXLAN_HF_RCO);
1836
1837                 if (!skb_is_gso(skb)) {
1838                         skb->ip_summed = CHECKSUM_NONE;
1839                         skb->encapsulation = 0;
1840                 }
1841         }
1842
1843         if (vxflags & VXLAN_F_GBP)
1844                 vxlan_build_gbp_hdr(vxh, vxflags, md);
1845
1846         skb_set_inner_protocol(skb, htons(ETH_P_TEB));
1847
1848         udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos, ttl, df,
1849                             src_port, dst_port, xnet,
1850                             !(vxflags & VXLAN_F_UDP_CSUM));
1851         return 0;
1852 }
1853
1854 #if IS_ENABLED(CONFIG_IPV6)
1855 static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
1856                                           struct sk_buff *skb, int oif,
1857                                           const struct in6_addr *daddr,
1858                                           struct in6_addr *saddr)
1859 {
1860         struct dst_entry *ndst;
1861         struct flowi6 fl6;
1862         int err;
1863
1864         memset(&fl6, 0, sizeof(fl6));
1865         fl6.flowi6_oif = oif;
1866         fl6.daddr = *daddr;
1867         fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
1868         fl6.flowi6_mark = skb->mark;
1869         fl6.flowi6_proto = IPPROTO_UDP;
1870
1871         err = ipv6_stub->ipv6_dst_lookup(vxlan->net,
1872                                          vxlan->vn6_sock->sock->sk,
1873                                          &ndst, &fl6);
1874         if (err < 0)
1875                 return ERR_PTR(err);
1876
1877         *saddr = fl6.saddr;
1878         return ndst;
1879 }
1880 #endif
1881
1882 /* Bypass encapsulation if the destination is local */
1883 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
1884                                struct vxlan_dev *dst_vxlan)
1885 {
1886         struct pcpu_sw_netstats *tx_stats, *rx_stats;
1887         union vxlan_addr loopback;
1888         union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
1889         struct net_device *dev = skb->dev;
1890         int len = skb->len;
1891
1892         tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
1893         rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
1894         skb->pkt_type = PACKET_HOST;
1895         skb->encapsulation = 0;
1896         skb->dev = dst_vxlan->dev;
1897         __skb_pull(skb, skb_network_offset(skb));
1898
1899         if (remote_ip->sa.sa_family == AF_INET) {
1900                 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1901                 loopback.sa.sa_family =  AF_INET;
1902 #if IS_ENABLED(CONFIG_IPV6)
1903         } else {
1904                 loopback.sin6.sin6_addr = in6addr_loopback;
1905                 loopback.sa.sa_family =  AF_INET6;
1906 #endif
1907         }
1908
1909         if (dst_vxlan->flags & VXLAN_F_LEARN)
1910                 vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
1911
1912         u64_stats_update_begin(&tx_stats->syncp);
1913         tx_stats->tx_packets++;
1914         tx_stats->tx_bytes += len;
1915         u64_stats_update_end(&tx_stats->syncp);
1916
1917         if (netif_rx(skb) == NET_RX_SUCCESS) {
1918                 u64_stats_update_begin(&rx_stats->syncp);
1919                 rx_stats->rx_packets++;
1920                 rx_stats->rx_bytes += len;
1921                 u64_stats_update_end(&rx_stats->syncp);
1922         } else {
1923                 dev->stats.rx_dropped++;
1924         }
1925 }
1926
1927 static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
1928                            struct vxlan_rdst *rdst, bool did_rsc)
1929 {
1930         struct ip_tunnel_info *info;
1931         struct vxlan_dev *vxlan = netdev_priv(dev);
1932         struct sock *sk;
1933         struct rtable *rt = NULL;
1934         const struct iphdr *old_iph;
1935         struct flowi4 fl4;
1936         union vxlan_addr *dst;
1937         union vxlan_addr remote_ip;
1938         struct vxlan_metadata _md;
1939         struct vxlan_metadata *md = &_md;
1940         __be16 src_port = 0, dst_port;
1941         u32 vni;
1942         __be16 df = 0;
1943         __u8 tos, ttl;
1944         int err;
1945         u32 flags = vxlan->flags;
1946
1947         info = skb_tunnel_info(skb);
1948
1949         if (rdst) {
1950                 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
1951                 vni = rdst->remote_vni;
1952                 dst = &rdst->remote_ip;
1953         } else {
1954                 if (!info) {
1955                         WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
1956                                   dev->name);
1957                         goto drop;
1958                 }
1959                 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
1960                 vni = be64_to_cpu(info->key.tun_id);
1961                 remote_ip.sa.sa_family = ip_tunnel_info_af(info);
1962                 if (remote_ip.sa.sa_family == AF_INET)
1963                         remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
1964                 else
1965                         remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
1966                 dst = &remote_ip;
1967         }
1968
1969         if (vxlan_addr_any(dst)) {
1970                 if (did_rsc) {
1971                         /* short-circuited back to local bridge */
1972                         vxlan_encap_bypass(skb, vxlan, vxlan);
1973                         return;
1974                 }
1975                 goto drop;
1976         }
1977
1978         old_iph = ip_hdr(skb);
1979
1980         ttl = vxlan->cfg.ttl;
1981         if (!ttl && vxlan_addr_multicast(dst))
1982                 ttl = 1;
1983
1984         tos = vxlan->cfg.tos;
1985         if (tos == 1)
1986                 tos = ip_tunnel_get_dsfield(old_iph, skb);
1987
1988         src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
1989                                      vxlan->cfg.port_max, true);
1990
1991         if (info) {
1992                 ttl = info->key.ttl;
1993                 tos = info->key.tos;
1994
1995                 if (info->options_len)
1996                         md = ip_tunnel_info_opts(info);
1997         } else {
1998                 md->gbp = skb->mark;
1999         }
2000
2001         if (dst->sa.sa_family == AF_INET) {
2002                 if (!vxlan->vn4_sock)
2003                         goto drop;
2004                 sk = vxlan->vn4_sock->sock->sk;
2005
2006                 if (info) {
2007                         if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
2008                                 df = htons(IP_DF);
2009
2010                         if (info->key.tun_flags & TUNNEL_CSUM)
2011                                 flags |= VXLAN_F_UDP_CSUM;
2012                         else
2013                                 flags &= ~VXLAN_F_UDP_CSUM;
2014                 }
2015
2016                 memset(&fl4, 0, sizeof(fl4));
2017                 fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
2018                 fl4.flowi4_tos = RT_TOS(tos);
2019                 fl4.flowi4_mark = skb->mark;
2020                 fl4.flowi4_proto = IPPROTO_UDP;
2021                 fl4.daddr = dst->sin.sin_addr.s_addr;
2022                 fl4.saddr = vxlan->cfg.saddr.sin.sin_addr.s_addr;
2023
2024                 rt = ip_route_output_key(vxlan->net, &fl4);
2025                 if (IS_ERR(rt)) {
2026                         netdev_dbg(dev, "no route to %pI4\n",
2027                                    &dst->sin.sin_addr.s_addr);
2028                         dev->stats.tx_carrier_errors++;
2029                         goto tx_error;
2030                 }
2031
2032                 if (rt->dst.dev == dev) {
2033                         netdev_dbg(dev, "circular route to %pI4\n",
2034                                    &dst->sin.sin_addr.s_addr);
2035                         dev->stats.collisions++;
2036                         goto rt_tx_error;
2037                 }
2038
2039                 /* Bypass encapsulation if the destination is local */
2040                 if (rt->rt_flags & RTCF_LOCAL &&
2041                     !(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2042                         struct vxlan_dev *dst_vxlan;
2043
2044                         ip_rt_put(rt);
2045                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2046                                                    dst->sa.sa_family, dst_port,
2047                                                    vxlan->flags);
2048                         if (!dst_vxlan)
2049                                 goto tx_error;
2050                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2051                         return;
2052                 }
2053
2054                 tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
2055                 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
2056                 err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
2057                                      dst->sin.sin_addr.s_addr, tos, ttl, df,
2058                                      src_port, dst_port, htonl(vni << 8), md,
2059                                      !net_eq(vxlan->net, dev_net(vxlan->dev)),
2060                                      flags);
2061                 if (err < 0) {
2062                         /* skb is already freed. */
2063                         skb = NULL;
2064                         goto rt_tx_error;
2065                 }
2066 #if IS_ENABLED(CONFIG_IPV6)
2067         } else {
2068                 struct dst_entry *ndst;
2069                 struct in6_addr saddr;
2070                 u32 rt6i_flags;
2071
2072                 if (!vxlan->vn6_sock)
2073                         goto drop;
2074                 sk = vxlan->vn6_sock->sock->sk;
2075
2076                 ndst = vxlan6_get_route(vxlan, skb,
2077                                         rdst ? rdst->remote_ifindex : 0,
2078                                         &dst->sin6.sin6_addr, &saddr);
2079                 if (IS_ERR(ndst)) {
2080                         netdev_dbg(dev, "no route to %pI6\n",
2081                                    &dst->sin6.sin6_addr);
2082                         dev->stats.tx_carrier_errors++;
2083                         goto tx_error;
2084                 }
2085
2086                 if (ndst->dev == dev) {
2087                         netdev_dbg(dev, "circular route to %pI6\n",
2088                                    &dst->sin6.sin6_addr);
2089                         dst_release(ndst);
2090                         dev->stats.collisions++;
2091                         goto tx_error;
2092                 }
2093
2094                 /* Bypass encapsulation if the destination is local */
2095                 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
2096                 if (rt6i_flags & RTF_LOCAL &&
2097                     !(rt6i_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
2098                         struct vxlan_dev *dst_vxlan;
2099
2100                         dst_release(ndst);
2101                         dst_vxlan = vxlan_find_vni(vxlan->net, vni,
2102                                                    dst->sa.sa_family, dst_port,
2103                                                    vxlan->flags);
2104                         if (!dst_vxlan)
2105                                 goto tx_error;
2106                         vxlan_encap_bypass(skb, vxlan, dst_vxlan);
2107                         return;
2108                 }
2109
2110                 if (info) {
2111                         if (info->key.tun_flags & TUNNEL_CSUM)
2112                                 flags &= ~VXLAN_F_UDP_ZERO_CSUM6_TX;
2113                         else
2114                                 flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2115                 }
2116
2117                 ttl = ttl ? : ip6_dst_hoplimit(ndst);
2118                 err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
2119                                       0, ttl, src_port, dst_port, htonl(vni << 8), md,
2120                                       !net_eq(vxlan->net, dev_net(vxlan->dev)),
2121                                       flags);
2122 #endif
2123         }
2124
2125         return;
2126
2127 drop:
2128         dev->stats.tx_dropped++;
2129         goto tx_free;
2130
2131 rt_tx_error:
2132         ip_rt_put(rt);
2133 tx_error:
2134         dev->stats.tx_errors++;
2135 tx_free:
2136         dev_kfree_skb(skb);
2137 }
2138
2139 /* Transmit local packets over Vxlan
2140  *
2141  * Outer IP header inherits ECN and DF from inner header.
2142  * Outer UDP destination is the VXLAN assigned port.
2143  *           source port is based on hash of flow
2144  */
2145 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
2146 {
2147         struct vxlan_dev *vxlan = netdev_priv(dev);
2148         const struct ip_tunnel_info *info;
2149         struct ethhdr *eth;
2150         bool did_rsc = false;
2151         struct vxlan_rdst *rdst, *fdst = NULL;
2152         struct vxlan_fdb *f;
2153
2154         info = skb_tunnel_info(skb);
2155
2156         skb_reset_mac_header(skb);
2157         eth = eth_hdr(skb);
2158
2159         if ((vxlan->flags & VXLAN_F_PROXY)) {
2160                 if (ntohs(eth->h_proto) == ETH_P_ARP)
2161                         return arp_reduce(dev, skb);
2162 #if IS_ENABLED(CONFIG_IPV6)
2163                 else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
2164                          pskb_may_pull(skb, sizeof(struct ipv6hdr)
2165                                        + sizeof(struct nd_msg)) &&
2166                          ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
2167                                 struct nd_msg *msg;
2168
2169                                 msg = (struct nd_msg *)skb_transport_header(skb);
2170                                 if (msg->icmph.icmp6_code == 0 &&
2171                                     msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
2172                                         return neigh_reduce(dev, skb);
2173                 }
2174                 eth = eth_hdr(skb);
2175 #endif
2176         }
2177
2178         if (vxlan->flags & VXLAN_F_COLLECT_METADATA) {
2179                 if (info && info->mode & IP_TUNNEL_INFO_TX)
2180                         vxlan_xmit_one(skb, dev, NULL, false);
2181                 else
2182                         kfree_skb(skb);
2183                 return NETDEV_TX_OK;
2184         }
2185
2186         f = vxlan_find_mac(vxlan, eth->h_dest);
2187         did_rsc = false;
2188
2189         if (f && (f->flags & NTF_ROUTER) && (vxlan->flags & VXLAN_F_RSC) &&
2190             (ntohs(eth->h_proto) == ETH_P_IP ||
2191              ntohs(eth->h_proto) == ETH_P_IPV6)) {
2192                 did_rsc = route_shortcircuit(dev, skb);
2193                 if (did_rsc)
2194                         f = vxlan_find_mac(vxlan, eth->h_dest);
2195         }
2196
2197         if (f == NULL) {
2198                 f = vxlan_find_mac(vxlan, all_zeros_mac);
2199                 if (f == NULL) {
2200                         if ((vxlan->flags & VXLAN_F_L2MISS) &&
2201                             !is_multicast_ether_addr(eth->h_dest))
2202                                 vxlan_fdb_miss(vxlan, eth->h_dest);
2203
2204                         dev->stats.tx_dropped++;
2205                         kfree_skb(skb);
2206                         return NETDEV_TX_OK;
2207                 }
2208         }
2209
2210         list_for_each_entry_rcu(rdst, &f->remotes, list) {
2211                 struct sk_buff *skb1;
2212
2213                 if (!fdst) {
2214                         fdst = rdst;
2215                         continue;
2216                 }
2217                 skb1 = skb_clone(skb, GFP_ATOMIC);
2218                 if (skb1)
2219                         vxlan_xmit_one(skb1, dev, rdst, did_rsc);
2220         }
2221
2222         if (fdst)
2223                 vxlan_xmit_one(skb, dev, fdst, did_rsc);
2224         else
2225                 kfree_skb(skb);
2226         return NETDEV_TX_OK;
2227 }
2228
2229 /* Walk the forwarding table and purge stale entries */
2230 static void vxlan_cleanup(unsigned long arg)
2231 {
2232         struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
2233         unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
2234         unsigned int h;
2235
2236         if (!netif_running(vxlan->dev))
2237                 return;
2238
2239         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2240                 struct hlist_node *p, *n;
2241
2242                 spin_lock_bh(&vxlan->hash_lock);
2243                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2244                         struct vxlan_fdb *f
2245                                 = container_of(p, struct vxlan_fdb, hlist);
2246                         unsigned long timeout;
2247
2248                         if (f->state & NUD_PERMANENT)
2249                                 continue;
2250
2251                         timeout = f->used + vxlan->cfg.age_interval * HZ;
2252                         if (time_before_eq(timeout, jiffies)) {
2253                                 netdev_dbg(vxlan->dev,
2254                                            "garbage collect %pM\n",
2255                                            f->eth_addr);
2256                                 f->state = NUD_STALE;
2257                                 vxlan_fdb_destroy(vxlan, f);
2258                         } else if (time_before(timeout, next_timer))
2259                                 next_timer = timeout;
2260                 }
2261                 spin_unlock_bh(&vxlan->hash_lock);
2262         }
2263
2264         mod_timer(&vxlan->age_timer, next_timer);
2265 }
2266
2267 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
2268 {
2269         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2270         __u32 vni = vxlan->default_dst.remote_vni;
2271
2272         spin_lock(&vn->sock_lock);
2273         hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
2274         spin_unlock(&vn->sock_lock);
2275 }
2276
2277 /* Setup stats when device is created */
2278 static int vxlan_init(struct net_device *dev)
2279 {
2280         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2281         if (!dev->tstats)
2282                 return -ENOMEM;
2283
2284         return 0;
2285 }
2286
2287 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
2288 {
2289         struct vxlan_fdb *f;
2290
2291         spin_lock_bh(&vxlan->hash_lock);
2292         f = __vxlan_find_mac(vxlan, all_zeros_mac);
2293         if (f)
2294                 vxlan_fdb_destroy(vxlan, f);
2295         spin_unlock_bh(&vxlan->hash_lock);
2296 }
2297
2298 static void vxlan_uninit(struct net_device *dev)
2299 {
2300         struct vxlan_dev *vxlan = netdev_priv(dev);
2301
2302         vxlan_fdb_delete_default(vxlan);
2303
2304         free_percpu(dev->tstats);
2305 }
2306
2307 /* Start ageing timer and join group when device is brought up */
2308 static int vxlan_open(struct net_device *dev)
2309 {
2310         struct vxlan_dev *vxlan = netdev_priv(dev);
2311         int ret;
2312
2313         ret = vxlan_sock_add(vxlan);
2314         if (ret < 0)
2315                 return ret;
2316
2317         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
2318                 ret = vxlan_igmp_join(vxlan);
2319                 if (ret == -EADDRINUSE)
2320                         ret = 0;
2321                 if (ret) {
2322                         vxlan_sock_release(vxlan);
2323                         return ret;
2324                 }
2325         }
2326
2327         if (vxlan->cfg.age_interval)
2328                 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
2329
2330         return ret;
2331 }
2332
2333 /* Purge the forwarding table */
2334 static void vxlan_flush(struct vxlan_dev *vxlan)
2335 {
2336         unsigned int h;
2337
2338         spin_lock_bh(&vxlan->hash_lock);
2339         for (h = 0; h < FDB_HASH_SIZE; ++h) {
2340                 struct hlist_node *p, *n;
2341                 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
2342                         struct vxlan_fdb *f
2343                                 = container_of(p, struct vxlan_fdb, hlist);
2344                         /* the all_zeros_mac entry is deleted at vxlan_uninit */
2345                         if (!is_zero_ether_addr(f->eth_addr))
2346                                 vxlan_fdb_destroy(vxlan, f);
2347                 }
2348         }
2349         spin_unlock_bh(&vxlan->hash_lock);
2350 }
2351
2352 /* Cleanup timer and forwarding table on shutdown */
2353 static int vxlan_stop(struct net_device *dev)
2354 {
2355         struct vxlan_dev *vxlan = netdev_priv(dev);
2356         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2357         int ret = 0;
2358
2359         if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
2360             !vxlan_group_used(vn, vxlan))
2361                 ret = vxlan_igmp_leave(vxlan);
2362
2363         del_timer_sync(&vxlan->age_timer);
2364
2365         vxlan_flush(vxlan);
2366         vxlan_sock_release(vxlan);
2367
2368         return ret;
2369 }
2370
2371 /* Stub, nothing needs to be done. */
2372 static void vxlan_set_multicast_list(struct net_device *dev)
2373 {
2374 }
2375
2376 static int __vxlan_change_mtu(struct net_device *dev,
2377                               struct net_device *lowerdev,
2378                               struct vxlan_rdst *dst, int new_mtu, bool strict)
2379 {
2380         int max_mtu = IP_MAX_MTU;
2381
2382         if (lowerdev)
2383                 max_mtu = lowerdev->mtu;
2384
2385         if (dst->remote_ip.sa.sa_family == AF_INET6)
2386                 max_mtu -= VXLAN6_HEADROOM;
2387         else
2388                 max_mtu -= VXLAN_HEADROOM;
2389
2390         if (new_mtu < 68)
2391                 return -EINVAL;
2392
2393         if (new_mtu > max_mtu) {
2394                 if (strict)
2395                         return -EINVAL;
2396
2397                 new_mtu = max_mtu;
2398         }
2399
2400         dev->mtu = new_mtu;
2401         return 0;
2402 }
2403
2404 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
2405 {
2406         struct vxlan_dev *vxlan = netdev_priv(dev);
2407         struct vxlan_rdst *dst = &vxlan->default_dst;
2408         struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
2409                                                          dst->remote_ifindex);
2410         return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
2411 }
2412
2413 static int egress_ipv4_tun_info(struct net_device *dev, struct sk_buff *skb,
2414                                 struct ip_tunnel_info *info,
2415                                 __be16 sport, __be16 dport)
2416 {
2417         struct vxlan_dev *vxlan = netdev_priv(dev);
2418         struct rtable *rt;
2419         struct flowi4 fl4;
2420
2421         memset(&fl4, 0, sizeof(fl4));
2422         fl4.flowi4_tos = RT_TOS(info->key.tos);
2423         fl4.flowi4_mark = skb->mark;
2424         fl4.flowi4_proto = IPPROTO_UDP;
2425         fl4.daddr = info->key.u.ipv4.dst;
2426
2427         rt = ip_route_output_key(vxlan->net, &fl4);
2428         if (IS_ERR(rt))
2429                 return PTR_ERR(rt);
2430         ip_rt_put(rt);
2431
2432         info->key.u.ipv4.src = fl4.saddr;
2433         info->key.tp_src = sport;
2434         info->key.tp_dst = dport;
2435         return 0;
2436 }
2437
2438 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
2439 {
2440         struct vxlan_dev *vxlan = netdev_priv(dev);
2441         struct ip_tunnel_info *info = skb_tunnel_info(skb);
2442         __be16 sport, dport;
2443
2444         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
2445                                   vxlan->cfg.port_max, true);
2446         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
2447
2448         if (ip_tunnel_info_af(info) == AF_INET) {
2449                 if (!vxlan->vn4_sock)
2450                         return -EINVAL;
2451                 return egress_ipv4_tun_info(dev, skb, info, sport, dport);
2452         } else {
2453 #if IS_ENABLED(CONFIG_IPV6)
2454                 struct dst_entry *ndst;
2455
2456                 if (!vxlan->vn6_sock)
2457                         return -EINVAL;
2458                 ndst = vxlan6_get_route(vxlan, skb, 0,
2459                                         &info->key.u.ipv6.dst,
2460                                         &info->key.u.ipv6.src);
2461                 if (IS_ERR(ndst))
2462                         return PTR_ERR(ndst);
2463                 dst_release(ndst);
2464
2465                 info->key.tp_src = sport;
2466                 info->key.tp_dst = dport;
2467 #else /* !CONFIG_IPV6 */
2468                 return -EPFNOSUPPORT;
2469 #endif
2470         }
2471         return 0;
2472 }
2473
2474 static const struct net_device_ops vxlan_netdev_ops = {
2475         .ndo_init               = vxlan_init,
2476         .ndo_uninit             = vxlan_uninit,
2477         .ndo_open               = vxlan_open,
2478         .ndo_stop               = vxlan_stop,
2479         .ndo_start_xmit         = vxlan_xmit,
2480         .ndo_get_stats64        = ip_tunnel_get_stats64,
2481         .ndo_set_rx_mode        = vxlan_set_multicast_list,
2482         .ndo_change_mtu         = vxlan_change_mtu,
2483         .ndo_validate_addr      = eth_validate_addr,
2484         .ndo_set_mac_address    = eth_mac_addr,
2485         .ndo_fdb_add            = vxlan_fdb_add,
2486         .ndo_fdb_del            = vxlan_fdb_delete,
2487         .ndo_fdb_dump           = vxlan_fdb_dump,
2488         .ndo_fill_metadata_dst  = vxlan_fill_metadata_dst,
2489 };
2490
2491 /* Info for udev, that this is a virtual tunnel endpoint */
2492 static struct device_type vxlan_type = {
2493         .name = "vxlan",
2494 };
2495
2496 /* Calls the ndo_add_vxlan_port of the caller in order to
2497  * supply the listening VXLAN udp ports. Callers are expected
2498  * to implement the ndo_add_vxlan_port.
2499  */
2500 void vxlan_get_rx_port(struct net_device *dev)
2501 {
2502         struct vxlan_sock *vs;
2503         struct net *net = dev_net(dev);
2504         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2505         sa_family_t sa_family;
2506         __be16 port;
2507         unsigned int i;
2508
2509         spin_lock(&vn->sock_lock);
2510         for (i = 0; i < PORT_HASH_SIZE; ++i) {
2511                 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
2512                         port = inet_sk(vs->sock->sk)->inet_sport;
2513                         sa_family = vxlan_get_sk_family(vs);
2514                         dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
2515                                                             port);
2516                 }
2517         }
2518         spin_unlock(&vn->sock_lock);
2519 }
2520 EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
2521
2522 /* Initialize the device structure. */
2523 static void vxlan_setup(struct net_device *dev)
2524 {
2525         struct vxlan_dev *vxlan = netdev_priv(dev);
2526         unsigned int h;
2527
2528         eth_hw_addr_random(dev);
2529         ether_setup(dev);
2530
2531         dev->netdev_ops = &vxlan_netdev_ops;
2532         dev->destructor = free_netdev;
2533         SET_NETDEV_DEVTYPE(dev, &vxlan_type);
2534
2535         dev->features   |= NETIF_F_LLTX;
2536         dev->features   |= NETIF_F_SG | NETIF_F_HW_CSUM;
2537         dev->features   |= NETIF_F_RXCSUM;
2538         dev->features   |= NETIF_F_GSO_SOFTWARE;
2539
2540         dev->vlan_features = dev->features;
2541         dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2542         dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
2543         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
2544         dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
2545         netif_keep_dst(dev);
2546         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2547         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
2548
2549         INIT_LIST_HEAD(&vxlan->next);
2550         spin_lock_init(&vxlan->hash_lock);
2551
2552         init_timer_deferrable(&vxlan->age_timer);
2553         vxlan->age_timer.function = vxlan_cleanup;
2554         vxlan->age_timer.data = (unsigned long) vxlan;
2555
2556         vxlan->cfg.dst_port = htons(vxlan_port);
2557
2558         vxlan->dev = dev;
2559
2560         gro_cells_init(&vxlan->gro_cells, dev);
2561
2562         for (h = 0; h < FDB_HASH_SIZE; ++h)
2563                 INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
2564 }
2565
2566 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
2567         [IFLA_VXLAN_ID]         = { .type = NLA_U32 },
2568         [IFLA_VXLAN_GROUP]      = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
2569         [IFLA_VXLAN_GROUP6]     = { .len = sizeof(struct in6_addr) },
2570         [IFLA_VXLAN_LINK]       = { .type = NLA_U32 },
2571         [IFLA_VXLAN_LOCAL]      = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
2572         [IFLA_VXLAN_LOCAL6]     = { .len = sizeof(struct in6_addr) },
2573         [IFLA_VXLAN_TOS]        = { .type = NLA_U8 },
2574         [IFLA_VXLAN_TTL]        = { .type = NLA_U8 },
2575         [IFLA_VXLAN_LEARNING]   = { .type = NLA_U8 },
2576         [IFLA_VXLAN_AGEING]     = { .type = NLA_U32 },
2577         [IFLA_VXLAN_LIMIT]      = { .type = NLA_U32 },
2578         [IFLA_VXLAN_PORT_RANGE] = { .len  = sizeof(struct ifla_vxlan_port_range) },
2579         [IFLA_VXLAN_PROXY]      = { .type = NLA_U8 },
2580         [IFLA_VXLAN_RSC]        = { .type = NLA_U8 },
2581         [IFLA_VXLAN_L2MISS]     = { .type = NLA_U8 },
2582         [IFLA_VXLAN_L3MISS]     = { .type = NLA_U8 },
2583         [IFLA_VXLAN_COLLECT_METADATA]   = { .type = NLA_U8 },
2584         [IFLA_VXLAN_PORT]       = { .type = NLA_U16 },
2585         [IFLA_VXLAN_UDP_CSUM]   = { .type = NLA_U8 },
2586         [IFLA_VXLAN_UDP_ZERO_CSUM6_TX]  = { .type = NLA_U8 },
2587         [IFLA_VXLAN_UDP_ZERO_CSUM6_RX]  = { .type = NLA_U8 },
2588         [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
2589         [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
2590         [IFLA_VXLAN_GBP]        = { .type = NLA_FLAG, },
2591         [IFLA_VXLAN_REMCSUM_NOPARTIAL]  = { .type = NLA_FLAG },
2592 };
2593
2594 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
2595 {
2596         if (tb[IFLA_ADDRESS]) {
2597                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
2598                         pr_debug("invalid link address (not ethernet)\n");
2599                         return -EINVAL;
2600                 }
2601
2602                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
2603                         pr_debug("invalid all zero ethernet address\n");
2604                         return -EADDRNOTAVAIL;
2605                 }
2606         }
2607
2608         if (!data)
2609                 return -EINVAL;
2610
2611         if (data[IFLA_VXLAN_ID]) {
2612                 __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
2613                 if (id >= VXLAN_VID_MASK)
2614                         return -ERANGE;
2615         }
2616
2617         if (data[IFLA_VXLAN_PORT_RANGE]) {
2618                 const struct ifla_vxlan_port_range *p
2619                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2620
2621                 if (ntohs(p->high) < ntohs(p->low)) {
2622                         pr_debug("port range %u .. %u not valid\n",
2623                                  ntohs(p->low), ntohs(p->high));
2624                         return -EINVAL;
2625                 }
2626         }
2627
2628         return 0;
2629 }
2630
2631 static void vxlan_get_drvinfo(struct net_device *netdev,
2632                               struct ethtool_drvinfo *drvinfo)
2633 {
2634         strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
2635         strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
2636 }
2637
2638 static const struct ethtool_ops vxlan_ethtool_ops = {
2639         .get_drvinfo    = vxlan_get_drvinfo,
2640         .get_link       = ethtool_op_get_link,
2641 };
2642
2643 static void vxlan_del_work(struct work_struct *work)
2644 {
2645         struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
2646         udp_tunnel_sock_release(vs->sock);
2647         kfree_rcu(vs, rcu);
2648 }
2649
2650 static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
2651                                         __be16 port, u32 flags)
2652 {
2653         struct socket *sock;
2654         struct udp_port_cfg udp_conf;
2655         int err;
2656
2657         memset(&udp_conf, 0, sizeof(udp_conf));
2658
2659         if (ipv6) {
2660                 udp_conf.family = AF_INET6;
2661                 udp_conf.use_udp6_rx_checksums =
2662                     !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
2663                 udp_conf.ipv6_v6only = 1;
2664         } else {
2665                 udp_conf.family = AF_INET;
2666         }
2667
2668         udp_conf.local_udp_port = port;
2669
2670         /* Open UDP socket */
2671         err = udp_sock_create(net, &udp_conf, &sock);
2672         if (err < 0)
2673                 return ERR_PTR(err);
2674
2675         return sock;
2676 }
2677
2678 /* Create new listen socket if needed */
2679 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
2680                                               __be16 port, u32 flags)
2681 {
2682         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
2683         struct vxlan_sock *vs;
2684         struct socket *sock;
2685         unsigned int h;
2686         struct udp_tunnel_sock_cfg tunnel_cfg;
2687
2688         vs = kzalloc(sizeof(*vs), GFP_KERNEL);
2689         if (!vs)
2690                 return ERR_PTR(-ENOMEM);
2691
2692         for (h = 0; h < VNI_HASH_SIZE; ++h)
2693                 INIT_HLIST_HEAD(&vs->vni_list[h]);
2694
2695         INIT_WORK(&vs->del_work, vxlan_del_work);
2696
2697         sock = vxlan_create_sock(net, ipv6, port, flags);
2698         if (IS_ERR(sock)) {
2699                 pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
2700                         PTR_ERR(sock));
2701                 kfree(vs);
2702                 return ERR_CAST(sock);
2703         }
2704
2705         vs->sock = sock;
2706         atomic_set(&vs->refcnt, 1);
2707         vs->flags = (flags & VXLAN_F_RCV_FLAGS);
2708
2709         /* Initialize the vxlan udp offloads structure */
2710         vs->udp_offloads.port = port;
2711         vs->udp_offloads.callbacks.gro_receive  = vxlan_gro_receive;
2712         vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
2713
2714         spin_lock(&vn->sock_lock);
2715         hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
2716         vxlan_notify_add_rx_port(vs);
2717         spin_unlock(&vn->sock_lock);
2718
2719         /* Mark socket as an encapsulation socket. */
2720         tunnel_cfg.sk_user_data = vs;
2721         tunnel_cfg.encap_type = 1;
2722         tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
2723         tunnel_cfg.encap_destroy = NULL;
2724
2725         setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
2726
2727         return vs;
2728 }
2729
2730 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
2731 {
2732         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
2733         struct vxlan_sock *vs = NULL;
2734
2735         if (!vxlan->cfg.no_share) {
2736                 spin_lock(&vn->sock_lock);
2737                 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
2738                                      vxlan->cfg.dst_port, vxlan->flags);
2739                 if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) {
2740                         spin_unlock(&vn->sock_lock);
2741                         return -EBUSY;
2742                 }
2743                 spin_unlock(&vn->sock_lock);
2744         }
2745         if (!vs)
2746                 vs = vxlan_socket_create(vxlan->net, ipv6,
2747                                          vxlan->cfg.dst_port, vxlan->flags);
2748         if (IS_ERR(vs))
2749                 return PTR_ERR(vs);
2750 #if IS_ENABLED(CONFIG_IPV6)
2751         if (ipv6)
2752                 vxlan->vn6_sock = vs;
2753         else
2754 #endif
2755                 vxlan->vn4_sock = vs;
2756         vxlan_vs_add_dev(vs, vxlan);
2757         return 0;
2758 }
2759
2760 static int vxlan_sock_add(struct vxlan_dev *vxlan)
2761 {
2762         bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
2763         bool metadata = vxlan->flags & VXLAN_F_COLLECT_METADATA;
2764         int ret = 0;
2765
2766         vxlan->vn4_sock = NULL;
2767 #if IS_ENABLED(CONFIG_IPV6)
2768         vxlan->vn6_sock = NULL;
2769         if (ipv6 || metadata)
2770                 ret = __vxlan_sock_add(vxlan, true);
2771 #endif
2772         if (!ret && (!ipv6 || metadata))
2773                 ret = __vxlan_sock_add(vxlan, false);
2774         if (ret < 0)
2775                 vxlan_sock_release(vxlan);
2776         return ret;
2777 }
2778
2779 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
2780                                struct vxlan_config *conf)
2781 {
2782         struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
2783         struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
2784         struct vxlan_rdst *dst = &vxlan->default_dst;
2785         unsigned short needed_headroom = ETH_HLEN;
2786         int err;
2787         bool use_ipv6 = false;
2788         __be16 default_port = vxlan->cfg.dst_port;
2789         struct net_device *lowerdev = NULL;
2790
2791         vxlan->net = src_net;
2792
2793         dst->remote_vni = conf->vni;
2794
2795         memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
2796
2797         /* Unless IPv6 is explicitly requested, assume IPv4 */
2798         if (!dst->remote_ip.sa.sa_family)
2799                 dst->remote_ip.sa.sa_family = AF_INET;
2800
2801         if (dst->remote_ip.sa.sa_family == AF_INET6 ||
2802             vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
2803                 if (!IS_ENABLED(CONFIG_IPV6))
2804                         return -EPFNOSUPPORT;
2805                 use_ipv6 = true;
2806                 vxlan->flags |= VXLAN_F_IPV6;
2807         }
2808
2809         if (conf->remote_ifindex) {
2810                 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
2811                 dst->remote_ifindex = conf->remote_ifindex;
2812
2813                 if (!lowerdev) {
2814                         pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
2815                         return -ENODEV;
2816                 }
2817
2818 #if IS_ENABLED(CONFIG_IPV6)
2819                 if (use_ipv6) {
2820                         struct inet6_dev *idev = __in6_dev_get(lowerdev);
2821                         if (idev && idev->cnf.disable_ipv6) {
2822                                 pr_info("IPv6 is disabled via sysctl\n");
2823                                 return -EPERM;
2824                         }
2825                 }
2826 #endif
2827
2828                 if (!conf->mtu)
2829                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
2830
2831                 needed_headroom = lowerdev->hard_header_len;
2832         }
2833
2834         if (conf->mtu) {
2835                 err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
2836                 if (err)
2837                         return err;
2838         }
2839
2840         if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
2841                 needed_headroom += VXLAN6_HEADROOM;
2842         else
2843                 needed_headroom += VXLAN_HEADROOM;
2844         dev->needed_headroom = needed_headroom;
2845
2846         memcpy(&vxlan->cfg, conf, sizeof(*conf));
2847         if (!vxlan->cfg.dst_port)
2848                 vxlan->cfg.dst_port = default_port;
2849         vxlan->flags |= conf->flags;
2850
2851         if (!vxlan->cfg.age_interval)
2852                 vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
2853
2854         list_for_each_entry(tmp, &vn->vxlan_list, next) {
2855                 if (tmp->cfg.vni == conf->vni &&
2856                     (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
2857                      tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
2858                     tmp->cfg.dst_port == vxlan->cfg.dst_port &&
2859                     (tmp->flags & VXLAN_F_RCV_FLAGS) ==
2860                     (vxlan->flags & VXLAN_F_RCV_FLAGS))
2861                 return -EEXIST;
2862         }
2863
2864         dev->ethtool_ops = &vxlan_ethtool_ops;
2865
2866         /* create an fdb entry for a valid default destination */
2867         if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
2868                 err = vxlan_fdb_create(vxlan, all_zeros_mac,
2869                                        &vxlan->default_dst.remote_ip,
2870                                        NUD_REACHABLE|NUD_PERMANENT,
2871                                        NLM_F_EXCL|NLM_F_CREATE,
2872                                        vxlan->cfg.dst_port,
2873                                        vxlan->default_dst.remote_vni,
2874                                        vxlan->default_dst.remote_ifindex,
2875                                        NTF_SELF);
2876                 if (err)
2877                         return err;
2878         }
2879
2880         err = register_netdevice(dev);
2881         if (err) {
2882                 vxlan_fdb_delete_default(vxlan);
2883                 return err;
2884         }
2885
2886         list_add(&vxlan->next, &vn->vxlan_list);
2887
2888         return 0;
2889 }
2890
2891 struct net_device *vxlan_dev_create(struct net *net, const char *name,
2892                                     u8 name_assign_type, struct vxlan_config *conf)
2893 {
2894         struct nlattr *tb[IFLA_MAX+1];
2895         struct net_device *dev;
2896         int err;
2897
2898         memset(&tb, 0, sizeof(tb));
2899
2900         dev = rtnl_create_link(net, name, name_assign_type,
2901                                &vxlan_link_ops, tb);
2902         if (IS_ERR(dev))
2903                 return dev;
2904
2905         err = vxlan_dev_configure(net, dev, conf);
2906         if (err < 0) {
2907                 free_netdev(dev);
2908                 return ERR_PTR(err);
2909         }
2910
2911         return dev;
2912 }
2913 EXPORT_SYMBOL_GPL(vxlan_dev_create);
2914
2915 static int vxlan_newlink(struct net *src_net, struct net_device *dev,
2916                          struct nlattr *tb[], struct nlattr *data[])
2917 {
2918         struct vxlan_config conf;
2919         int err;
2920
2921         memset(&conf, 0, sizeof(conf));
2922
2923         if (data[IFLA_VXLAN_ID])
2924                 conf.vni = nla_get_u32(data[IFLA_VXLAN_ID]);
2925
2926         if (data[IFLA_VXLAN_GROUP]) {
2927                 conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
2928         } else if (data[IFLA_VXLAN_GROUP6]) {
2929                 if (!IS_ENABLED(CONFIG_IPV6))
2930                         return -EPFNOSUPPORT;
2931
2932                 conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
2933                 conf.remote_ip.sa.sa_family = AF_INET6;
2934         }
2935
2936         if (data[IFLA_VXLAN_LOCAL]) {
2937                 conf.saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
2938                 conf.saddr.sa.sa_family = AF_INET;
2939         } else if (data[IFLA_VXLAN_LOCAL6]) {
2940                 if (!IS_ENABLED(CONFIG_IPV6))
2941                         return -EPFNOSUPPORT;
2942
2943                 /* TODO: respect scope id */
2944                 conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
2945                 conf.saddr.sa.sa_family = AF_INET6;
2946         }
2947
2948         if (data[IFLA_VXLAN_LINK])
2949                 conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
2950
2951         if (data[IFLA_VXLAN_TOS])
2952                 conf.tos  = nla_get_u8(data[IFLA_VXLAN_TOS]);
2953
2954         if (data[IFLA_VXLAN_TTL])
2955                 conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
2956
2957         if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
2958                 conf.flags |= VXLAN_F_LEARN;
2959
2960         if (data[IFLA_VXLAN_AGEING])
2961                 conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
2962
2963         if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
2964                 conf.flags |= VXLAN_F_PROXY;
2965
2966         if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
2967                 conf.flags |= VXLAN_F_RSC;
2968
2969         if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
2970                 conf.flags |= VXLAN_F_L2MISS;
2971
2972         if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
2973                 conf.flags |= VXLAN_F_L3MISS;
2974
2975         if (data[IFLA_VXLAN_LIMIT])
2976                 conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
2977
2978         if (data[IFLA_VXLAN_COLLECT_METADATA] &&
2979             nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
2980                 conf.flags |= VXLAN_F_COLLECT_METADATA;
2981
2982         if (data[IFLA_VXLAN_PORT_RANGE]) {
2983                 const struct ifla_vxlan_port_range *p
2984                         = nla_data(data[IFLA_VXLAN_PORT_RANGE]);
2985                 conf.port_min = ntohs(p->low);
2986                 conf.port_max = ntohs(p->high);
2987         }
2988
2989         if (data[IFLA_VXLAN_PORT])
2990                 conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
2991
2992         if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
2993                 conf.flags |= VXLAN_F_UDP_CSUM;
2994
2995         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
2996             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
2997                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
2998
2999         if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
3000             nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
3001                 conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
3002
3003         if (data[IFLA_VXLAN_REMCSUM_TX] &&
3004             nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
3005                 conf.flags |= VXLAN_F_REMCSUM_TX;
3006
3007         if (data[IFLA_VXLAN_REMCSUM_RX] &&
3008             nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
3009                 conf.flags |= VXLAN_F_REMCSUM_RX;
3010
3011         if (data[IFLA_VXLAN_GBP])
3012                 conf.flags |= VXLAN_F_GBP;
3013
3014         if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
3015                 conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
3016
3017         err = vxlan_dev_configure(src_net, dev, &conf);
3018         switch (err) {
3019         case -ENODEV:
3020                 pr_info("ifindex %d does not exist\n", conf.remote_ifindex);
3021                 break;
3022
3023         case -EPERM:
3024                 pr_info("IPv6 is disabled via sysctl\n");
3025                 break;
3026
3027         case -EEXIST:
3028                 pr_info("duplicate VNI %u\n", conf.vni);
3029                 break;
3030         }
3031
3032         return err;
3033 }
3034
3035 static void vxlan_dellink(struct net_device *dev, struct list_head *head)
3036 {
3037         struct vxlan_dev *vxlan = netdev_priv(dev);
3038         struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
3039
3040         spin_lock(&vn->sock_lock);
3041         if (!hlist_unhashed(&vxlan->hlist))
3042                 hlist_del_rcu(&vxlan->hlist);
3043         spin_unlock(&vn->sock_lock);
3044
3045         gro_cells_destroy(&vxlan->gro_cells);
3046         list_del(&vxlan->next);
3047         unregister_netdevice_queue(dev, head);
3048 }
3049
3050 static size_t vxlan_get_size(const struct net_device *dev)
3051 {
3052
3053         return nla_total_size(sizeof(__u32)) +  /* IFLA_VXLAN_ID */
3054                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
3055                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
3056                 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
3057                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TTL */
3058                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_TOS */
3059                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_LEARNING */
3060                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_PROXY */
3061                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_RSC */
3062                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L2MISS */
3063                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_L3MISS */
3064                 nla_total_size(sizeof(__u8)) +  /* IFLA_VXLAN_COLLECT_METADATA */
3065                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
3066                 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
3067                 nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
3068                 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
3069                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
3070                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
3071                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
3072                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
3073                 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
3074                 0;
3075 }
3076
3077 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
3078 {
3079         const struct vxlan_dev *vxlan = netdev_priv(dev);
3080         const struct vxlan_rdst *dst = &vxlan->default_dst;
3081         struct ifla_vxlan_port_range ports = {
3082                 .low =  htons(vxlan->cfg.port_min),
3083                 .high = htons(vxlan->cfg.port_max),
3084         };
3085
3086         if (nla_put_u32(skb, IFLA_VXLAN_ID, dst->remote_vni))
3087                 goto nla_put_failure;
3088
3089         if (!vxlan_addr_any(&dst->remote_ip)) {
3090                 if (dst->remote_ip.sa.sa_family == AF_INET) {
3091                         if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
3092                                             dst->remote_ip.sin.sin_addr.s_addr))
3093                                 goto nla_put_failure;
3094 #if IS_ENABLED(CONFIG_IPV6)
3095                 } else {
3096                         if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
3097                                              &dst->remote_ip.sin6.sin6_addr))
3098                                 goto nla_put_failure;
3099 #endif
3100                 }
3101         }
3102
3103         if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
3104                 goto nla_put_failure;
3105
3106         if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
3107                 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
3108                         if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
3109                                             vxlan->cfg.saddr.sin.sin_addr.s_addr))
3110                                 goto nla_put_failure;
3111 #if IS_ENABLED(CONFIG_IPV6)
3112                 } else {
3113                         if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
3114                                              &vxlan->cfg.saddr.sin6.sin6_addr))
3115                                 goto nla_put_failure;
3116 #endif
3117                 }
3118         }
3119
3120         if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
3121             nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
3122             nla_put_u8(skb, IFLA_VXLAN_LEARNING,
3123                         !!(vxlan->flags & VXLAN_F_LEARN)) ||
3124             nla_put_u8(skb, IFLA_VXLAN_PROXY,
3125                         !!(vxlan->flags & VXLAN_F_PROXY)) ||
3126             nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
3127             nla_put_u8(skb, IFLA_VXLAN_L2MISS,
3128                         !!(vxlan->flags & VXLAN_F_L2MISS)) ||
3129             nla_put_u8(skb, IFLA_VXLAN_L3MISS,
3130                         !!(vxlan->flags & VXLAN_F_L3MISS)) ||
3131             nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
3132                        !!(vxlan->flags & VXLAN_F_COLLECT_METADATA)) ||
3133             nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
3134             nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
3135             nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
3136             nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
3137                         !!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
3138             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
3139                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
3140             nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
3141                         !!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
3142             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
3143                         !!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
3144             nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
3145                         !!(vxlan->flags & VXLAN_F_REMCSUM_RX)))
3146                 goto nla_put_failure;
3147
3148         if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
3149                 goto nla_put_failure;
3150
3151         if (vxlan->flags & VXLAN_F_GBP &&
3152             nla_put_flag(skb, IFLA_VXLAN_GBP))
3153                 goto nla_put_failure;
3154
3155         if (vxlan->flags & VXLAN_F_REMCSUM_NOPARTIAL &&
3156             nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
3157                 goto nla_put_failure;
3158
3159         return 0;
3160
3161 nla_put_failure:
3162         return -EMSGSIZE;
3163 }
3164
3165 static struct net *vxlan_get_link_net(const struct net_device *dev)
3166 {
3167         struct vxlan_dev *vxlan = netdev_priv(dev);
3168
3169         return vxlan->net;
3170 }
3171
3172 static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
3173         .kind           = "vxlan",
3174         .maxtype        = IFLA_VXLAN_MAX,
3175         .policy         = vxlan_policy,
3176         .priv_size      = sizeof(struct vxlan_dev),
3177         .setup          = vxlan_setup,
3178         .validate       = vxlan_validate,
3179         .newlink        = vxlan_newlink,
3180         .dellink        = vxlan_dellink,
3181         .get_size       = vxlan_get_size,
3182         .fill_info      = vxlan_fill_info,
3183         .get_link_net   = vxlan_get_link_net,
3184 };
3185
3186 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
3187                                              struct net_device *dev)
3188 {
3189         struct vxlan_dev *vxlan, *next;
3190         LIST_HEAD(list_kill);
3191
3192         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3193                 struct vxlan_rdst *dst = &vxlan->default_dst;
3194
3195                 /* In case we created vxlan device with carrier
3196                  * and we loose the carrier due to module unload
3197                  * we also need to remove vxlan device. In other
3198                  * cases, it's not necessary and remote_ifindex
3199                  * is 0 here, so no matches.
3200                  */
3201                 if (dst->remote_ifindex == dev->ifindex)
3202                         vxlan_dellink(vxlan->dev, &list_kill);
3203         }
3204
3205         unregister_netdevice_many(&list_kill);
3206 }
3207
3208 static int vxlan_lowerdev_event(struct notifier_block *unused,
3209                                 unsigned long event, void *ptr)
3210 {
3211         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3212         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
3213
3214         if (event == NETDEV_UNREGISTER)
3215                 vxlan_handle_lowerdev_unregister(vn, dev);
3216
3217         return NOTIFY_DONE;
3218 }
3219
3220 static struct notifier_block vxlan_notifier_block __read_mostly = {
3221         .notifier_call = vxlan_lowerdev_event,
3222 };
3223
3224 static __net_init int vxlan_init_net(struct net *net)
3225 {
3226         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3227         unsigned int h;
3228
3229         INIT_LIST_HEAD(&vn->vxlan_list);
3230         spin_lock_init(&vn->sock_lock);
3231
3232         for (h = 0; h < PORT_HASH_SIZE; ++h)
3233                 INIT_HLIST_HEAD(&vn->sock_list[h]);
3234
3235         return 0;
3236 }
3237
3238 static void __net_exit vxlan_exit_net(struct net *net)
3239 {
3240         struct vxlan_net *vn = net_generic(net, vxlan_net_id);
3241         struct vxlan_dev *vxlan, *next;
3242         struct net_device *dev, *aux;
3243         LIST_HEAD(list);
3244
3245         rtnl_lock();
3246         for_each_netdev_safe(net, dev, aux)
3247                 if (dev->rtnl_link_ops == &vxlan_link_ops)
3248                         unregister_netdevice_queue(dev, &list);
3249
3250         list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
3251                 /* If vxlan->dev is in the same netns, it has already been added
3252                  * to the list by the previous loop.
3253                  */
3254                 if (!net_eq(dev_net(vxlan->dev), net)) {
3255                         gro_cells_destroy(&vxlan->gro_cells);
3256                         unregister_netdevice_queue(vxlan->dev, &list);
3257                 }
3258         }
3259
3260         unregister_netdevice_many(&list);
3261         rtnl_unlock();
3262 }
3263
3264 static struct pernet_operations vxlan_net_ops = {
3265         .init = vxlan_init_net,
3266         .exit = vxlan_exit_net,
3267         .id   = &vxlan_net_id,
3268         .size = sizeof(struct vxlan_net),
3269 };
3270
3271 static int __init vxlan_init_module(void)
3272 {
3273         int rc;
3274
3275         vxlan_wq = alloc_workqueue("vxlan", 0, 0);
3276         if (!vxlan_wq)
3277                 return -ENOMEM;
3278
3279         get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
3280
3281         rc = register_pernet_subsys(&vxlan_net_ops);
3282         if (rc)
3283                 goto out1;
3284
3285         rc = register_netdevice_notifier(&vxlan_notifier_block);
3286         if (rc)
3287                 goto out2;
3288
3289         rc = rtnl_link_register(&vxlan_link_ops);
3290         if (rc)
3291                 goto out3;
3292
3293         return 0;
3294 out3:
3295         unregister_netdevice_notifier(&vxlan_notifier_block);
3296 out2:
3297         unregister_pernet_subsys(&vxlan_net_ops);
3298 out1:
3299         destroy_workqueue(vxlan_wq);
3300         return rc;
3301 }
3302 late_initcall(vxlan_init_module);
3303
3304 static void __exit vxlan_cleanup_module(void)
3305 {
3306         rtnl_link_unregister(&vxlan_link_ops);
3307         unregister_netdevice_notifier(&vxlan_notifier_block);
3308         destroy_workqueue(vxlan_wq);
3309         unregister_pernet_subsys(&vxlan_net_ops);
3310         /* rcu_barrier() is called by netns */
3311 }
3312 module_exit(vxlan_cleanup_module);
3313
3314 MODULE_LICENSE("GPL");
3315 MODULE_VERSION(VXLAN_VERSION);
3316 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
3317 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
3318 MODULE_ALIAS_RTNL_LINK("vxlan");