1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * VXLAN: Virtual eXtensible Local Area Network 4 * 5 * Copyright (c) 2012-2013 Vyatta Inc. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/slab.h> 14 #include <linux/udp.h> 15 #include <linux/igmp.h> 16 #include <linux/if_ether.h> 17 #include <linux/ethtool.h> 18 #include <net/arp.h> 19 #include <net/ndisc.h> 20 #include <net/gro.h> 21 #include <net/ipv6_stubs.h> 22 #include <net/ip.h> 23 #include <net/icmp.h> 24 #include <net/rtnetlink.h> 25 #include <net/inet_ecn.h> 26 #include <net/net_namespace.h> 27 #include <net/netns/generic.h> 28 #include <net/tun_proto.h> 29 #include <net/vxlan.h> 30 #include <net/nexthop.h> 31 32 #if IS_ENABLED(CONFIG_IPV6) 33 #include <net/ip6_tunnel.h> 34 #include <net/ip6_checksum.h> 35 #endif 36 37 #include "vxlan_private.h" 38 39 #define VXLAN_VERSION "0.1" 40 41 #define FDB_AGE_DEFAULT 300 /* 5 min */ 42 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ 43 44 /* UDP port for VXLAN traffic. 45 * The IANA assigned port is 4789, but the Linux default is 8472 46 * for compatibility with early adopters. 47 */ 48 static unsigned short vxlan_port __read_mostly = 8472; 49 module_param_named(udp_port, vxlan_port, ushort, 0444); 50 MODULE_PARM_DESC(udp_port, "Destination UDP port"); 51 52 static bool log_ecn_error = true; 53 module_param(log_ecn_error, bool, 0644); 54 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 55 56 unsigned int vxlan_net_id; 57 58 const u8 all_zeros_mac[ETH_ALEN + 2]; 59 static struct rtnl_link_ops vxlan_link_ops; 60 61 static int vxlan_sock_add(struct vxlan_dev *vxlan); 62 63 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan); 64 65 /* salt for hash table */ 66 static u32 vxlan_salt __read_mostly; 67 68 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs) 69 { 70 return vs->flags & VXLAN_F_COLLECT_METADATA || 71 ip_tunnel_collect_metadata(); 72 } 73 74 /* Find VXLAN socket based on network namespace, address family, UDP port, 75 * enabled unshareable flags and socket device binding (see l3mdev with 76 * non-default VRF). 77 */ 78 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family, 79 __be16 port, u32 flags, int ifindex) 80 { 81 struct vxlan_sock *vs; 82 83 flags &= VXLAN_F_RCV_FLAGS; 84 85 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { 86 if (inet_sk(vs->sock->sk)->inet_sport == port && 87 vxlan_get_sk_family(vs) == family && 88 vs->flags == flags && 89 vs->sock->sk->sk_bound_dev_if == ifindex) 90 return vs; 91 } 92 return NULL; 93 } 94 95 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, 96 int ifindex, __be32 vni, 97 struct vxlan_vni_node **vninode) 98 { 99 struct vxlan_vni_node *vnode; 100 struct vxlan_dev_node *node; 101 102 /* For flow based devices, map all packets to VNI 0 */ 103 if (vs->flags & VXLAN_F_COLLECT_METADATA && 104 !(vs->flags & VXLAN_F_VNIFILTER)) 105 vni = 0; 106 107 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) { 108 if (!node->vxlan) 109 continue; 110 vnode = NULL; 111 if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 112 vnode = vxlan_vnifilter_lookup(node->vxlan, vni); 113 if (!vnode) 114 continue; 115 } else if (node->vxlan->default_dst.remote_vni != vni) { 116 continue; 117 } 118 119 if (IS_ENABLED(CONFIG_IPV6)) { 120 const struct vxlan_config *cfg = &node->vxlan->cfg; 121 122 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) && 123 cfg->remote_ifindex != ifindex) 124 continue; 125 } 126 127 if (vninode) 128 *vninode = vnode; 129 return node->vxlan; 130 } 131 132 return NULL; 133 } 134 135 /* Look up VNI in a per net namespace table */ 136 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex, 137 __be32 vni, sa_family_t family, 138 __be16 port, u32 flags) 139 { 140 struct vxlan_sock *vs; 141 142 vs = vxlan_find_sock(net, family, port, flags, ifindex); 143 if (!vs) 144 return NULL; 145 146 return vxlan_vs_find_vni(vs, ifindex, vni, NULL); 147 } 148 149 /* Fill in neighbour message in skbuff. */ 150 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, 151 const struct vxlan_fdb *fdb, 152 u32 portid, u32 seq, int type, unsigned int flags, 153 const struct vxlan_rdst *rdst) 154 { 155 unsigned long now = jiffies; 156 struct nda_cacheinfo ci; 157 bool send_ip, send_eth; 158 struct nlmsghdr *nlh; 159 struct nexthop *nh; 160 struct ndmsg *ndm; 161 int nh_family; 162 u32 nh_id; 163 164 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); 165 if (nlh == NULL) 166 return -EMSGSIZE; 167 168 ndm = nlmsg_data(nlh); 169 memset(ndm, 0, sizeof(*ndm)); 170 171 send_eth = send_ip = true; 172 173 rcu_read_lock(); 174 nh = rcu_dereference(fdb->nh); 175 if (nh) { 176 nh_family = nexthop_get_family(nh); 177 nh_id = nh->id; 178 } 179 rcu_read_unlock(); 180 181 if (type == RTM_GETNEIGH) { 182 if (rdst) { 183 send_ip = !vxlan_addr_any(&rdst->remote_ip); 184 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET; 185 } else if (nh) { 186 ndm->ndm_family = nh_family; 187 } 188 send_eth = !is_zero_ether_addr(fdb->eth_addr); 189 } else 190 ndm->ndm_family = AF_BRIDGE; 191 ndm->ndm_state = fdb->state; 192 ndm->ndm_ifindex = vxlan->dev->ifindex; 193 ndm->ndm_flags = fdb->flags; 194 if (rdst && rdst->offloaded) 195 ndm->ndm_flags |= NTF_OFFLOADED; 196 ndm->ndm_type = RTN_UNICAST; 197 198 if (!net_eq(dev_net(vxlan->dev), vxlan->net) && 199 nla_put_s32(skb, NDA_LINK_NETNSID, 200 peernet2id(dev_net(vxlan->dev), vxlan->net))) 201 goto nla_put_failure; 202 203 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr)) 204 goto nla_put_failure; 205 if (nh) { 206 if (nla_put_u32(skb, NDA_NH_ID, nh_id)) 207 goto nla_put_failure; 208 } else if (rdst) { 209 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, 210 &rdst->remote_ip)) 211 goto nla_put_failure; 212 213 if (rdst->remote_port && 214 rdst->remote_port != vxlan->cfg.dst_port && 215 nla_put_be16(skb, NDA_PORT, rdst->remote_port)) 216 goto nla_put_failure; 217 if (rdst->remote_vni != vxlan->default_dst.remote_vni && 218 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni))) 219 goto nla_put_failure; 220 if (rdst->remote_ifindex && 221 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) 222 goto nla_put_failure; 223 } 224 225 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni && 226 nla_put_u32(skb, NDA_SRC_VNI, 227 be32_to_cpu(fdb->vni))) 228 goto nla_put_failure; 229 230 ci.ndm_used = jiffies_to_clock_t(now - fdb->used); 231 ci.ndm_confirmed = 0; 232 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); 233 ci.ndm_refcnt = 0; 234 235 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) 236 goto nla_put_failure; 237 238 nlmsg_end(skb, nlh); 239 return 0; 240 241 nla_put_failure: 242 nlmsg_cancel(skb, nlh); 243 return -EMSGSIZE; 244 } 245 246 static inline size_t vxlan_nlmsg_size(void) 247 { 248 return NLMSG_ALIGN(sizeof(struct ndmsg)) 249 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ 250 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */ 251 + nla_total_size(sizeof(__be16)) /* NDA_PORT */ 252 + nla_total_size(sizeof(__be32)) /* NDA_VNI */ 253 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ 254 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */ 255 + nla_total_size(sizeof(struct nda_cacheinfo)); 256 } 257 258 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 259 struct vxlan_rdst *rd, int type) 260 { 261 struct net *net = dev_net(vxlan->dev); 262 struct sk_buff *skb; 263 int err = -ENOBUFS; 264 265 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); 266 if (skb == NULL) 267 goto errout; 268 269 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd); 270 if (err < 0) { 271 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ 272 WARN_ON(err == -EMSGSIZE); 273 kfree_skb(skb); 274 goto errout; 275 } 276 277 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 278 return; 279 errout: 280 if (err < 0) 281 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 282 } 283 284 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, 285 const struct vxlan_fdb *fdb, 286 const struct vxlan_rdst *rd, 287 struct netlink_ext_ack *extack, 288 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 289 { 290 fdb_info->info.dev = vxlan->dev; 291 fdb_info->info.extack = extack; 292 fdb_info->remote_ip = rd->remote_ip; 293 fdb_info->remote_port = rd->remote_port; 294 fdb_info->remote_vni = rd->remote_vni; 295 fdb_info->remote_ifindex = rd->remote_ifindex; 296 memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN); 297 fdb_info->vni = fdb->vni; 298 fdb_info->offloaded = rd->offloaded; 299 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; 300 } 301 302 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, 303 struct vxlan_fdb *fdb, 304 struct vxlan_rdst *rd, 305 bool adding, 306 struct netlink_ext_ack *extack) 307 { 308 struct switchdev_notifier_vxlan_fdb_info info; 309 enum switchdev_notifier_type notifier_type; 310 int ret; 311 312 if (WARN_ON(!rd)) 313 return 0; 314 315 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE 316 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; 317 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); 318 ret = call_switchdev_notifiers(notifier_type, vxlan->dev, 319 &info.info, extack); 320 return notifier_to_errno(ret); 321 } 322 323 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 324 struct vxlan_rdst *rd, int type, bool swdev_notify, 325 struct netlink_ext_ack *extack) 326 { 327 int err; 328 329 if (swdev_notify && rd) { 330 switch (type) { 331 case RTM_NEWNEIGH: 332 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 333 true, extack); 334 if (err) 335 return err; 336 break; 337 case RTM_DELNEIGH: 338 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 339 false, extack); 340 break; 341 } 342 } 343 344 __vxlan_fdb_notify(vxlan, fdb, rd, type); 345 return 0; 346 } 347 348 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) 349 { 350 struct vxlan_dev *vxlan = netdev_priv(dev); 351 struct vxlan_fdb f = { 352 .state = NUD_STALE, 353 }; 354 struct vxlan_rdst remote = { 355 .remote_ip = *ipa, /* goes to NDA_DST */ 356 .remote_vni = cpu_to_be32(VXLAN_N_VID), 357 }; 358 359 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 360 } 361 362 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) 363 { 364 struct vxlan_fdb f = { 365 .state = NUD_STALE, 366 }; 367 struct vxlan_rdst remote = { }; 368 369 memcpy(f.eth_addr, eth_addr, ETH_ALEN); 370 371 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 372 } 373 374 /* Hash Ethernet address */ 375 static u32 eth_hash(const unsigned char *addr) 376 { 377 u64 value = get_unaligned((u64 *)addr); 378 379 /* only want 6 bytes */ 380 #ifdef __BIG_ENDIAN 381 value >>= 16; 382 #else 383 value <<= 16; 384 #endif 385 return hash_64(value, FDB_HASH_BITS); 386 } 387 388 u32 eth_vni_hash(const unsigned char *addr, __be32 vni) 389 { 390 /* use 1 byte of OUI and 3 bytes of NIC */ 391 u32 key = get_unaligned((u32 *)(addr + 2)); 392 393 return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1); 394 } 395 396 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni) 397 { 398 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) 399 return eth_vni_hash(mac, vni); 400 else 401 return eth_hash(mac); 402 } 403 404 /* Hash chain to use given mac address */ 405 static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan, 406 const u8 *mac, __be32 vni) 407 { 408 return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)]; 409 } 410 411 /* Look up Ethernet address in forwarding table */ 412 static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan, 413 const u8 *mac, __be32 vni) 414 { 415 struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni); 416 struct vxlan_fdb *f; 417 418 hlist_for_each_entry_rcu(f, head, hlist) { 419 if (ether_addr_equal(mac, f->eth_addr)) { 420 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 421 if (vni == f->vni) 422 return f; 423 } else { 424 return f; 425 } 426 } 427 } 428 429 return NULL; 430 } 431 432 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, 433 const u8 *mac, __be32 vni) 434 { 435 struct vxlan_fdb *f; 436 437 f = __vxlan_find_mac(vxlan, mac, vni); 438 if (f && f->used != jiffies) 439 f->used = jiffies; 440 441 return f; 442 } 443 444 /* caller should hold vxlan->hash_lock */ 445 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, 446 union vxlan_addr *ip, __be16 port, 447 __be32 vni, __u32 ifindex) 448 { 449 struct vxlan_rdst *rd; 450 451 list_for_each_entry(rd, &f->remotes, list) { 452 if (vxlan_addr_equal(&rd->remote_ip, ip) && 453 rd->remote_port == port && 454 rd->remote_vni == vni && 455 rd->remote_ifindex == ifindex) 456 return rd; 457 } 458 459 return NULL; 460 } 461 462 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, 463 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 464 { 465 struct vxlan_dev *vxlan = netdev_priv(dev); 466 u8 eth_addr[ETH_ALEN + 2] = { 0 }; 467 struct vxlan_rdst *rdst; 468 struct vxlan_fdb *f; 469 int rc = 0; 470 471 if (is_multicast_ether_addr(mac) || 472 is_zero_ether_addr(mac)) 473 return -EINVAL; 474 475 ether_addr_copy(eth_addr, mac); 476 477 rcu_read_lock(); 478 479 f = __vxlan_find_mac(vxlan, eth_addr, vni); 480 if (!f) { 481 rc = -ENOENT; 482 goto out; 483 } 484 485 rdst = first_remote_rcu(f); 486 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); 487 488 out: 489 rcu_read_unlock(); 490 return rc; 491 } 492 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); 493 494 static int vxlan_fdb_notify_one(struct notifier_block *nb, 495 const struct vxlan_dev *vxlan, 496 const struct vxlan_fdb *f, 497 const struct vxlan_rdst *rdst, 498 struct netlink_ext_ack *extack) 499 { 500 struct switchdev_notifier_vxlan_fdb_info fdb_info; 501 int rc; 502 503 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); 504 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, 505 &fdb_info); 506 return notifier_to_errno(rc); 507 } 508 509 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 510 struct notifier_block *nb, 511 struct netlink_ext_ack *extack) 512 { 513 struct vxlan_dev *vxlan; 514 struct vxlan_rdst *rdst; 515 struct vxlan_fdb *f; 516 unsigned int h; 517 int rc = 0; 518 519 if (!netif_is_vxlan(dev)) 520 return -EINVAL; 521 vxlan = netdev_priv(dev); 522 523 for (h = 0; h < FDB_HASH_SIZE; ++h) { 524 spin_lock_bh(&vxlan->hash_lock[h]); 525 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) { 526 if (f->vni == vni) { 527 list_for_each_entry(rdst, &f->remotes, list) { 528 rc = vxlan_fdb_notify_one(nb, vxlan, 529 f, rdst, 530 extack); 531 if (rc) 532 goto unlock; 533 } 534 } 535 } 536 spin_unlock_bh(&vxlan->hash_lock[h]); 537 } 538 return 0; 539 540 unlock: 541 spin_unlock_bh(&vxlan->hash_lock[h]); 542 return rc; 543 } 544 EXPORT_SYMBOL_GPL(vxlan_fdb_replay); 545 546 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) 547 { 548 struct vxlan_dev *vxlan; 549 struct vxlan_rdst *rdst; 550 struct vxlan_fdb *f; 551 unsigned int h; 552 553 if (!netif_is_vxlan(dev)) 554 return; 555 vxlan = netdev_priv(dev); 556 557 for (h = 0; h < FDB_HASH_SIZE; ++h) { 558 spin_lock_bh(&vxlan->hash_lock[h]); 559 hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) 560 if (f->vni == vni) 561 list_for_each_entry(rdst, &f->remotes, list) 562 rdst->offloaded = false; 563 spin_unlock_bh(&vxlan->hash_lock[h]); 564 } 565 566 } 567 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); 568 569 /* Replace destination of unicast mac */ 570 static int vxlan_fdb_replace(struct vxlan_fdb *f, 571 union vxlan_addr *ip, __be16 port, __be32 vni, 572 __u32 ifindex, struct vxlan_rdst *oldrd) 573 { 574 struct vxlan_rdst *rd; 575 576 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 577 if (rd) 578 return 0; 579 580 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); 581 if (!rd) 582 return 0; 583 584 *oldrd = *rd; 585 dst_cache_reset(&rd->dst_cache); 586 rd->remote_ip = *ip; 587 rd->remote_port = port; 588 rd->remote_vni = vni; 589 rd->remote_ifindex = ifindex; 590 rd->offloaded = false; 591 return 1; 592 } 593 594 /* Add/update destinations for multicast */ 595 static int vxlan_fdb_append(struct vxlan_fdb *f, 596 union vxlan_addr *ip, __be16 port, __be32 vni, 597 __u32 ifindex, struct vxlan_rdst **rdp) 598 { 599 struct vxlan_rdst *rd; 600 601 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 602 if (rd) 603 return 0; 604 605 rd = kmalloc(sizeof(*rd), GFP_ATOMIC); 606 if (rd == NULL) 607 return -ENOMEM; 608 609 if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) { 610 kfree(rd); 611 return -ENOMEM; 612 } 613 614 rd->remote_ip = *ip; 615 rd->remote_port = port; 616 rd->offloaded = false; 617 rd->remote_vni = vni; 618 rd->remote_ifindex = ifindex; 619 620 list_add_tail_rcu(&rd->list, &f->remotes); 621 622 *rdp = rd; 623 return 1; 624 } 625 626 static bool vxlan_parse_gpe_proto(struct vxlanhdr *hdr, __be16 *protocol) 627 { 628 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)hdr; 629 630 /* Need to have Next Protocol set for interfaces in GPE mode. */ 631 if (!gpe->np_applied) 632 return false; 633 /* "The initial version is 0. If a receiver does not support the 634 * version indicated it MUST drop the packet. 635 */ 636 if (gpe->version != 0) 637 return false; 638 /* "When the O bit is set to 1, the packet is an OAM packet and OAM 639 * processing MUST occur." However, we don't implement OAM 640 * processing, thus drop the packet. 641 */ 642 if (gpe->oam_flag) 643 return false; 644 645 *protocol = tun_p_to_eth_p(gpe->next_protocol); 646 if (!*protocol) 647 return false; 648 649 return true; 650 } 651 652 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, 653 unsigned int off, 654 struct vxlanhdr *vh, size_t hdrlen, 655 __be32 vni_field, 656 struct gro_remcsum *grc, 657 bool nopartial) 658 { 659 size_t start, offset; 660 661 if (skb->remcsum_offload) 662 return vh; 663 664 if (!NAPI_GRO_CB(skb)->csum_valid) 665 return NULL; 666 667 start = vxlan_rco_start(vni_field); 668 offset = start + vxlan_rco_offset(vni_field); 669 670 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen, 671 start, offset, grc, nopartial); 672 673 skb->remcsum_offload = 1; 674 675 return vh; 676 } 677 678 static struct vxlanhdr *vxlan_gro_prepare_receive(struct sock *sk, 679 struct list_head *head, 680 struct sk_buff *skb, 681 struct gro_remcsum *grc) 682 { 683 struct sk_buff *p; 684 struct vxlanhdr *vh, *vh2; 685 unsigned int hlen, off_vx; 686 struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk); 687 __be32 flags; 688 689 skb_gro_remcsum_init(grc); 690 691 off_vx = skb_gro_offset(skb); 692 hlen = off_vx + sizeof(*vh); 693 vh = skb_gro_header(skb, hlen, off_vx); 694 if (unlikely(!vh)) 695 return NULL; 696 697 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr)); 698 699 flags = vh->vx_flags; 700 701 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { 702 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr), 703 vh->vx_vni, grc, 704 !!(vs->flags & 705 VXLAN_F_REMCSUM_NOPARTIAL)); 706 707 if (!vh) 708 return NULL; 709 } 710 711 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ 712 713 list_for_each_entry(p, head, list) { 714 if (!NAPI_GRO_CB(p)->same_flow) 715 continue; 716 717 vh2 = (struct vxlanhdr *)(p->data + off_vx); 718 if (vh->vx_flags != vh2->vx_flags || 719 vh->vx_vni != vh2->vx_vni) { 720 NAPI_GRO_CB(p)->same_flow = 0; 721 continue; 722 } 723 } 724 725 return vh; 726 } 727 728 static struct sk_buff *vxlan_gro_receive(struct sock *sk, 729 struct list_head *head, 730 struct sk_buff *skb) 731 { 732 struct sk_buff *pp = NULL; 733 struct gro_remcsum grc; 734 int flush = 1; 735 736 if (vxlan_gro_prepare_receive(sk, head, skb, &grc)) { 737 pp = call_gro_receive(eth_gro_receive, head, skb); 738 flush = 0; 739 } 740 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 741 return pp; 742 } 743 744 static struct sk_buff *vxlan_gpe_gro_receive(struct sock *sk, 745 struct list_head *head, 746 struct sk_buff *skb) 747 { 748 const struct packet_offload *ptype; 749 struct sk_buff *pp = NULL; 750 struct gro_remcsum grc; 751 struct vxlanhdr *vh; 752 __be16 protocol; 753 int flush = 1; 754 755 vh = vxlan_gro_prepare_receive(sk, head, skb, &grc); 756 if (vh) { 757 if (!vxlan_parse_gpe_proto(vh, &protocol)) 758 goto out; 759 ptype = gro_find_receive_by_type(protocol); 760 if (!ptype) 761 goto out; 762 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 763 flush = 0; 764 } 765 out: 766 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 767 return pp; 768 } 769 770 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 771 { 772 /* Sets 'skb->inner_mac_header' since we are always called with 773 * 'skb->encapsulation' set. 774 */ 775 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 776 } 777 778 static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 779 { 780 struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff); 781 const struct packet_offload *ptype; 782 int err = -ENOSYS; 783 __be16 protocol; 784 785 if (!vxlan_parse_gpe_proto(vh, &protocol)) 786 return err; 787 ptype = gro_find_complete_by_type(protocol); 788 if (ptype) 789 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 790 return err; 791 } 792 793 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac, 794 __u16 state, __be32 src_vni, 795 __u16 ndm_flags) 796 { 797 struct vxlan_fdb *f; 798 799 f = kmalloc(sizeof(*f), GFP_ATOMIC); 800 if (!f) 801 return NULL; 802 f->state = state; 803 f->flags = ndm_flags; 804 f->updated = f->used = jiffies; 805 f->vni = src_vni; 806 f->nh = NULL; 807 RCU_INIT_POINTER(f->vdev, vxlan); 808 INIT_LIST_HEAD(&f->nh_list); 809 INIT_LIST_HEAD(&f->remotes); 810 memcpy(f->eth_addr, mac, ETH_ALEN); 811 812 return f; 813 } 814 815 static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac, 816 __be32 src_vni, struct vxlan_fdb *f) 817 { 818 ++vxlan->addrcnt; 819 hlist_add_head_rcu(&f->hlist, 820 vxlan_fdb_head(vxlan, mac, src_vni)); 821 } 822 823 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 824 u32 nhid, struct netlink_ext_ack *extack) 825 { 826 struct nexthop *old_nh = rtnl_dereference(fdb->nh); 827 struct nexthop *nh; 828 int err = -EINVAL; 829 830 if (old_nh && old_nh->id == nhid) 831 return 0; 832 833 nh = nexthop_find_by_id(vxlan->net, nhid); 834 if (!nh) { 835 NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); 836 goto err_inval; 837 } 838 839 if (!nexthop_get(nh)) { 840 NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); 841 nh = NULL; 842 goto err_inval; 843 } 844 if (!nexthop_is_fdb(nh)) { 845 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop"); 846 goto err_inval; 847 } 848 849 if (!nexthop_is_multipath(nh)) { 850 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group"); 851 goto err_inval; 852 } 853 854 /* check nexthop group family */ 855 switch (vxlan->default_dst.remote_ip.sa.sa_family) { 856 case AF_INET: 857 if (!nexthop_has_v4(nh)) { 858 err = -EAFNOSUPPORT; 859 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 860 goto err_inval; 861 } 862 break; 863 case AF_INET6: 864 if (nexthop_has_v4(nh)) { 865 err = -EAFNOSUPPORT; 866 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 867 goto err_inval; 868 } 869 } 870 871 if (old_nh) { 872 list_del_rcu(&fdb->nh_list); 873 nexthop_put(old_nh); 874 } 875 rcu_assign_pointer(fdb->nh, nh); 876 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list); 877 return 1; 878 879 err_inval: 880 if (nh) 881 nexthop_put(nh); 882 return err; 883 } 884 885 int vxlan_fdb_create(struct vxlan_dev *vxlan, 886 const u8 *mac, union vxlan_addr *ip, 887 __u16 state, __be16 port, __be32 src_vni, 888 __be32 vni, __u32 ifindex, __u16 ndm_flags, 889 u32 nhid, struct vxlan_fdb **fdb, 890 struct netlink_ext_ack *extack) 891 { 892 struct vxlan_rdst *rd = NULL; 893 struct vxlan_fdb *f; 894 int rc; 895 896 if (vxlan->cfg.addrmax && 897 vxlan->addrcnt >= vxlan->cfg.addrmax) 898 return -ENOSPC; 899 900 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 901 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags); 902 if (!f) 903 return -ENOMEM; 904 905 if (nhid) 906 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 907 else 908 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 909 if (rc < 0) 910 goto errout; 911 912 *fdb = f; 913 914 return 0; 915 916 errout: 917 kfree(f); 918 return rc; 919 } 920 921 static void __vxlan_fdb_free(struct vxlan_fdb *f) 922 { 923 struct vxlan_rdst *rd, *nd; 924 struct nexthop *nh; 925 926 nh = rcu_dereference_raw(f->nh); 927 if (nh) { 928 rcu_assign_pointer(f->nh, NULL); 929 rcu_assign_pointer(f->vdev, NULL); 930 nexthop_put(nh); 931 } 932 933 list_for_each_entry_safe(rd, nd, &f->remotes, list) { 934 dst_cache_destroy(&rd->dst_cache); 935 kfree(rd); 936 } 937 kfree(f); 938 } 939 940 static void vxlan_fdb_free(struct rcu_head *head) 941 { 942 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); 943 944 __vxlan_fdb_free(f); 945 } 946 947 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 948 bool do_notify, bool swdev_notify) 949 { 950 struct vxlan_rdst *rd; 951 952 netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr); 953 954 --vxlan->addrcnt; 955 if (do_notify) { 956 if (rcu_access_pointer(f->nh)) 957 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH, 958 swdev_notify, NULL); 959 else 960 list_for_each_entry(rd, &f->remotes, list) 961 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, 962 swdev_notify, NULL); 963 } 964 965 hlist_del_rcu(&f->hlist); 966 list_del_rcu(&f->nh_list); 967 call_rcu(&f->rcu, vxlan_fdb_free); 968 } 969 970 static void vxlan_dst_free(struct rcu_head *head) 971 { 972 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); 973 974 dst_cache_destroy(&rd->dst_cache); 975 kfree(rd); 976 } 977 978 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, 979 union vxlan_addr *ip, 980 __u16 state, __u16 flags, 981 __be16 port, __be32 vni, 982 __u32 ifindex, __u16 ndm_flags, 983 struct vxlan_fdb *f, u32 nhid, 984 bool swdev_notify, 985 struct netlink_ext_ack *extack) 986 { 987 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 988 struct vxlan_rdst *rd = NULL; 989 struct vxlan_rdst oldrd; 990 int notify = 0; 991 int rc = 0; 992 int err; 993 994 if (nhid && !rcu_access_pointer(f->nh)) { 995 NL_SET_ERR_MSG(extack, 996 "Cannot replace an existing non nexthop fdb with a nexthop"); 997 return -EOPNOTSUPP; 998 } 999 1000 if (nhid && (flags & NLM_F_APPEND)) { 1001 NL_SET_ERR_MSG(extack, 1002 "Cannot append to a nexthop fdb"); 1003 return -EOPNOTSUPP; 1004 } 1005 1006 /* Do not allow an externally learned entry to take over an entry added 1007 * by the user. 1008 */ 1009 if (!(fdb_flags & NTF_EXT_LEARNED) || 1010 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { 1011 if (f->state != state) { 1012 f->state = state; 1013 f->updated = jiffies; 1014 notify = 1; 1015 } 1016 if (f->flags != fdb_flags) { 1017 f->flags = fdb_flags; 1018 f->updated = jiffies; 1019 notify = 1; 1020 } 1021 } 1022 1023 if ((flags & NLM_F_REPLACE)) { 1024 /* Only change unicasts */ 1025 if (!(is_multicast_ether_addr(f->eth_addr) || 1026 is_zero_ether_addr(f->eth_addr))) { 1027 if (nhid) { 1028 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 1029 if (rc < 0) 1030 return rc; 1031 } else { 1032 rc = vxlan_fdb_replace(f, ip, port, vni, 1033 ifindex, &oldrd); 1034 } 1035 notify |= rc; 1036 } else { 1037 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries"); 1038 return -EOPNOTSUPP; 1039 } 1040 } 1041 if ((flags & NLM_F_APPEND) && 1042 (is_multicast_ether_addr(f->eth_addr) || 1043 is_zero_ether_addr(f->eth_addr))) { 1044 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 1045 1046 if (rc < 0) 1047 return rc; 1048 notify |= rc; 1049 } 1050 1051 if (ndm_flags & NTF_USE) 1052 f->used = jiffies; 1053 1054 if (notify) { 1055 if (rd == NULL) 1056 rd = first_remote_rtnl(f); 1057 1058 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, 1059 swdev_notify, extack); 1060 if (err) 1061 goto err_notify; 1062 } 1063 1064 return 0; 1065 1066 err_notify: 1067 if (nhid) 1068 return err; 1069 if ((flags & NLM_F_REPLACE) && rc) 1070 *rd = oldrd; 1071 else if ((flags & NLM_F_APPEND) && rc) { 1072 list_del_rcu(&rd->list); 1073 call_rcu(&rd->rcu, vxlan_dst_free); 1074 } 1075 return err; 1076 } 1077 1078 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, 1079 const u8 *mac, union vxlan_addr *ip, 1080 __u16 state, __u16 flags, 1081 __be16 port, __be32 src_vni, __be32 vni, 1082 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1083 bool swdev_notify, 1084 struct netlink_ext_ack *extack) 1085 { 1086 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 1087 struct vxlan_fdb *f; 1088 int rc; 1089 1090 /* Disallow replace to add a multicast entry */ 1091 if ((flags & NLM_F_REPLACE) && 1092 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) 1093 return -EOPNOTSUPP; 1094 1095 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 1096 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, 1097 vni, ifindex, fdb_flags, nhid, &f, extack); 1098 if (rc < 0) 1099 return rc; 1100 1101 vxlan_fdb_insert(vxlan, mac, src_vni, f); 1102 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, 1103 swdev_notify, extack); 1104 if (rc) 1105 goto err_notify; 1106 1107 return 0; 1108 1109 err_notify: 1110 vxlan_fdb_destroy(vxlan, f, false, false); 1111 return rc; 1112 } 1113 1114 /* Add new entry to forwarding table -- assumes lock held */ 1115 int vxlan_fdb_update(struct vxlan_dev *vxlan, 1116 const u8 *mac, union vxlan_addr *ip, 1117 __u16 state, __u16 flags, 1118 __be16 port, __be32 src_vni, __be32 vni, 1119 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1120 bool swdev_notify, 1121 struct netlink_ext_ack *extack) 1122 { 1123 struct vxlan_fdb *f; 1124 1125 f = __vxlan_find_mac(vxlan, mac, src_vni); 1126 if (f) { 1127 if (flags & NLM_F_EXCL) { 1128 netdev_dbg(vxlan->dev, 1129 "lost race to create %pM\n", mac); 1130 return -EEXIST; 1131 } 1132 1133 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, 1134 vni, ifindex, ndm_flags, f, 1135 nhid, swdev_notify, extack); 1136 } else { 1137 if (!(flags & NLM_F_CREATE)) 1138 return -ENOENT; 1139 1140 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, 1141 port, src_vni, vni, ifindex, 1142 ndm_flags, nhid, swdev_notify, 1143 extack); 1144 } 1145 } 1146 1147 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 1148 struct vxlan_rdst *rd, bool swdev_notify) 1149 { 1150 list_del_rcu(&rd->list); 1151 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); 1152 call_rcu(&rd->rcu, vxlan_dst_free); 1153 } 1154 1155 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, 1156 union vxlan_addr *ip, __be16 *port, __be32 *src_vni, 1157 __be32 *vni, u32 *ifindex, u32 *nhid, 1158 struct netlink_ext_ack *extack) 1159 { 1160 struct net *net = dev_net(vxlan->dev); 1161 int err; 1162 1163 if (tb[NDA_NH_ID] && 1164 (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) { 1165 NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID"); 1166 return -EINVAL; 1167 } 1168 1169 if (tb[NDA_DST]) { 1170 err = vxlan_nla_get_addr(ip, tb[NDA_DST]); 1171 if (err) { 1172 NL_SET_ERR_MSG(extack, "Unsupported address family"); 1173 return err; 1174 } 1175 } else { 1176 union vxlan_addr *remote = &vxlan->default_dst.remote_ip; 1177 1178 if (remote->sa.sa_family == AF_INET) { 1179 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); 1180 ip->sa.sa_family = AF_INET; 1181 #if IS_ENABLED(CONFIG_IPV6) 1182 } else { 1183 ip->sin6.sin6_addr = in6addr_any; 1184 ip->sa.sa_family = AF_INET6; 1185 #endif 1186 } 1187 } 1188 1189 if (tb[NDA_PORT]) { 1190 if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) { 1191 NL_SET_ERR_MSG(extack, "Invalid vxlan port"); 1192 return -EINVAL; 1193 } 1194 *port = nla_get_be16(tb[NDA_PORT]); 1195 } else { 1196 *port = vxlan->cfg.dst_port; 1197 } 1198 1199 if (tb[NDA_VNI]) { 1200 if (nla_len(tb[NDA_VNI]) != sizeof(u32)) { 1201 NL_SET_ERR_MSG(extack, "Invalid vni"); 1202 return -EINVAL; 1203 } 1204 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1205 } else { 1206 *vni = vxlan->default_dst.remote_vni; 1207 } 1208 1209 if (tb[NDA_SRC_VNI]) { 1210 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) { 1211 NL_SET_ERR_MSG(extack, "Invalid src vni"); 1212 return -EINVAL; 1213 } 1214 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 1215 } else { 1216 *src_vni = vxlan->default_dst.remote_vni; 1217 } 1218 1219 if (tb[NDA_IFINDEX]) { 1220 struct net_device *tdev; 1221 1222 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) { 1223 NL_SET_ERR_MSG(extack, "Invalid ifindex"); 1224 return -EINVAL; 1225 } 1226 *ifindex = nla_get_u32(tb[NDA_IFINDEX]); 1227 tdev = __dev_get_by_index(net, *ifindex); 1228 if (!tdev) { 1229 NL_SET_ERR_MSG(extack, "Device not found"); 1230 return -EADDRNOTAVAIL; 1231 } 1232 } else { 1233 *ifindex = 0; 1234 } 1235 1236 if (tb[NDA_NH_ID]) 1237 *nhid = nla_get_u32(tb[NDA_NH_ID]); 1238 else 1239 *nhid = 0; 1240 1241 return 0; 1242 } 1243 1244 /* Add static entry (via netlink) */ 1245 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1246 struct net_device *dev, 1247 const unsigned char *addr, u16 vid, u16 flags, 1248 struct netlink_ext_ack *extack) 1249 { 1250 struct vxlan_dev *vxlan = netdev_priv(dev); 1251 /* struct net *net = dev_net(vxlan->dev); */ 1252 union vxlan_addr ip; 1253 __be16 port; 1254 __be32 src_vni, vni; 1255 u32 ifindex, nhid; 1256 u32 hash_index; 1257 int err; 1258 1259 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { 1260 pr_info("RTM_NEWNEIGH with invalid state %#x\n", 1261 ndm->ndm_state); 1262 return -EINVAL; 1263 } 1264 1265 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID])) 1266 return -EINVAL; 1267 1268 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1269 &nhid, extack); 1270 if (err) 1271 return err; 1272 1273 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) 1274 return -EAFNOSUPPORT; 1275 1276 hash_index = fdb_head_index(vxlan, addr, src_vni); 1277 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1278 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, 1279 port, src_vni, vni, ifindex, 1280 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, 1281 nhid, true, extack); 1282 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1283 1284 return err; 1285 } 1286 1287 int __vxlan_fdb_delete(struct vxlan_dev *vxlan, 1288 const unsigned char *addr, union vxlan_addr ip, 1289 __be16 port, __be32 src_vni, __be32 vni, 1290 u32 ifindex, bool swdev_notify) 1291 { 1292 struct vxlan_rdst *rd = NULL; 1293 struct vxlan_fdb *f; 1294 int err = -ENOENT; 1295 1296 f = vxlan_find_mac(vxlan, addr, src_vni); 1297 if (!f) 1298 return err; 1299 1300 if (!vxlan_addr_any(&ip)) { 1301 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); 1302 if (!rd) 1303 goto out; 1304 } 1305 1306 /* remove a destination if it's not the only one on the list, 1307 * otherwise destroy the fdb entry 1308 */ 1309 if (rd && !list_is_singular(&f->remotes)) { 1310 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify); 1311 goto out; 1312 } 1313 1314 vxlan_fdb_destroy(vxlan, f, true, swdev_notify); 1315 1316 out: 1317 return 0; 1318 } 1319 1320 /* Delete entry (via netlink) */ 1321 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1322 struct net_device *dev, 1323 const unsigned char *addr, u16 vid, 1324 struct netlink_ext_ack *extack) 1325 { 1326 struct vxlan_dev *vxlan = netdev_priv(dev); 1327 union vxlan_addr ip; 1328 __be32 src_vni, vni; 1329 u32 ifindex, nhid; 1330 u32 hash_index; 1331 __be16 port; 1332 int err; 1333 1334 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1335 &nhid, extack); 1336 if (err) 1337 return err; 1338 1339 hash_index = fdb_head_index(vxlan, addr, src_vni); 1340 spin_lock_bh(&vxlan->hash_lock[hash_index]); 1341 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, 1342 true); 1343 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 1344 1345 return err; 1346 } 1347 1348 /* Dump forwarding table */ 1349 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 1350 struct net_device *dev, 1351 struct net_device *filter_dev, int *idx) 1352 { 1353 struct vxlan_dev *vxlan = netdev_priv(dev); 1354 unsigned int h; 1355 int err = 0; 1356 1357 for (h = 0; h < FDB_HASH_SIZE; ++h) { 1358 struct vxlan_fdb *f; 1359 1360 rcu_read_lock(); 1361 hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) { 1362 struct vxlan_rdst *rd; 1363 1364 if (rcu_access_pointer(f->nh)) { 1365 if (*idx < cb->args[2]) 1366 goto skip_nh; 1367 err = vxlan_fdb_info(skb, vxlan, f, 1368 NETLINK_CB(cb->skb).portid, 1369 cb->nlh->nlmsg_seq, 1370 RTM_NEWNEIGH, 1371 NLM_F_MULTI, NULL); 1372 if (err < 0) { 1373 rcu_read_unlock(); 1374 goto out; 1375 } 1376 skip_nh: 1377 *idx += 1; 1378 continue; 1379 } 1380 1381 list_for_each_entry_rcu(rd, &f->remotes, list) { 1382 if (*idx < cb->args[2]) 1383 goto skip; 1384 1385 err = vxlan_fdb_info(skb, vxlan, f, 1386 NETLINK_CB(cb->skb).portid, 1387 cb->nlh->nlmsg_seq, 1388 RTM_NEWNEIGH, 1389 NLM_F_MULTI, rd); 1390 if (err < 0) { 1391 rcu_read_unlock(); 1392 goto out; 1393 } 1394 skip: 1395 *idx += 1; 1396 } 1397 } 1398 rcu_read_unlock(); 1399 } 1400 out: 1401 return err; 1402 } 1403 1404 static int vxlan_fdb_get(struct sk_buff *skb, 1405 struct nlattr *tb[], 1406 struct net_device *dev, 1407 const unsigned char *addr, 1408 u16 vid, u32 portid, u32 seq, 1409 struct netlink_ext_ack *extack) 1410 { 1411 struct vxlan_dev *vxlan = netdev_priv(dev); 1412 struct vxlan_fdb *f; 1413 __be32 vni; 1414 int err; 1415 1416 if (tb[NDA_VNI]) 1417 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1418 else 1419 vni = vxlan->default_dst.remote_vni; 1420 1421 rcu_read_lock(); 1422 1423 f = __vxlan_find_mac(vxlan, addr, vni); 1424 if (!f) { 1425 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1426 err = -ENOENT; 1427 goto errout; 1428 } 1429 1430 err = vxlan_fdb_info(skb, vxlan, f, portid, seq, 1431 RTM_NEWNEIGH, 0, first_remote_rcu(f)); 1432 errout: 1433 rcu_read_unlock(); 1434 return err; 1435 } 1436 1437 /* Watch incoming packets to learn mapping between Ethernet address 1438 * and Tunnel endpoint. 1439 * Return true if packet is bogus and should be dropped. 1440 */ 1441 static bool vxlan_snoop(struct net_device *dev, 1442 union vxlan_addr *src_ip, const u8 *src_mac, 1443 u32 src_ifindex, __be32 vni) 1444 { 1445 struct vxlan_dev *vxlan = netdev_priv(dev); 1446 struct vxlan_fdb *f; 1447 u32 ifindex = 0; 1448 1449 #if IS_ENABLED(CONFIG_IPV6) 1450 if (src_ip->sa.sa_family == AF_INET6 && 1451 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)) 1452 ifindex = src_ifindex; 1453 #endif 1454 1455 f = vxlan_find_mac(vxlan, src_mac, vni); 1456 if (likely(f)) { 1457 struct vxlan_rdst *rdst = first_remote_rcu(f); 1458 1459 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && 1460 rdst->remote_ifindex == ifindex)) 1461 return false; 1462 1463 /* Don't migrate static entries, drop packets */ 1464 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 1465 return true; 1466 1467 /* Don't override an fdb with nexthop with a learnt entry */ 1468 if (rcu_access_pointer(f->nh)) 1469 return true; 1470 1471 if (net_ratelimit()) 1472 netdev_info(dev, 1473 "%pM migrated from %pIS to %pIS\n", 1474 src_mac, &rdst->remote_ip.sa, &src_ip->sa); 1475 1476 rdst->remote_ip = *src_ip; 1477 f->updated = jiffies; 1478 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL); 1479 } else { 1480 u32 hash_index = fdb_head_index(vxlan, src_mac, vni); 1481 1482 /* learned new entry */ 1483 spin_lock(&vxlan->hash_lock[hash_index]); 1484 1485 /* close off race between vxlan_flush and incoming packets */ 1486 if (netif_running(dev)) 1487 vxlan_fdb_update(vxlan, src_mac, src_ip, 1488 NUD_REACHABLE, 1489 NLM_F_EXCL|NLM_F_CREATE, 1490 vxlan->cfg.dst_port, 1491 vni, 1492 vxlan->default_dst.remote_vni, 1493 ifindex, NTF_SELF, 0, true, NULL); 1494 spin_unlock(&vxlan->hash_lock[hash_index]); 1495 } 1496 1497 return false; 1498 } 1499 1500 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) 1501 { 1502 struct vxlan_net *vn; 1503 1504 if (!vs) 1505 return false; 1506 if (!refcount_dec_and_test(&vs->refcnt)) 1507 return false; 1508 1509 vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); 1510 spin_lock(&vn->sock_lock); 1511 hlist_del_rcu(&vs->hlist); 1512 udp_tunnel_notify_del_rx_port(vs->sock, 1513 (vs->flags & VXLAN_F_GPE) ? 1514 UDP_TUNNEL_TYPE_VXLAN_GPE : 1515 UDP_TUNNEL_TYPE_VXLAN); 1516 spin_unlock(&vn->sock_lock); 1517 1518 return true; 1519 } 1520 1521 static void vxlan_sock_release(struct vxlan_dev *vxlan) 1522 { 1523 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); 1524 #if IS_ENABLED(CONFIG_IPV6) 1525 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); 1526 1527 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 1528 #endif 1529 1530 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 1531 synchronize_net(); 1532 1533 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 1534 vxlan_vs_del_vnigrp(vxlan); 1535 else 1536 vxlan_vs_del_dev(vxlan); 1537 1538 if (__vxlan_sock_release_prep(sock4)) { 1539 udp_tunnel_sock_release(sock4->sock); 1540 kfree(sock4); 1541 } 1542 1543 #if IS_ENABLED(CONFIG_IPV6) 1544 if (__vxlan_sock_release_prep(sock6)) { 1545 udp_tunnel_sock_release(sock6->sock); 1546 kfree(sock6); 1547 } 1548 #endif 1549 } 1550 1551 static bool vxlan_remcsum(struct vxlanhdr *unparsed, 1552 struct sk_buff *skb, u32 vxflags) 1553 { 1554 size_t start, offset; 1555 1556 if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload) 1557 goto out; 1558 1559 start = vxlan_rco_start(unparsed->vx_vni); 1560 offset = start + vxlan_rco_offset(unparsed->vx_vni); 1561 1562 if (!pskb_may_pull(skb, offset + sizeof(u16))) 1563 return false; 1564 1565 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset, 1566 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL)); 1567 out: 1568 unparsed->vx_flags &= ~VXLAN_HF_RCO; 1569 unparsed->vx_vni &= VXLAN_VNI_MASK; 1570 return true; 1571 } 1572 1573 static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed, 1574 struct sk_buff *skb, u32 vxflags, 1575 struct vxlan_metadata *md) 1576 { 1577 struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed; 1578 struct metadata_dst *tun_dst; 1579 1580 if (!(unparsed->vx_flags & VXLAN_HF_GBP)) 1581 goto out; 1582 1583 md->gbp = ntohs(gbp->policy_id); 1584 1585 tun_dst = (struct metadata_dst *)skb_dst(skb); 1586 if (tun_dst) { 1587 tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT; 1588 tun_dst->u.tun_info.options_len = sizeof(*md); 1589 } 1590 if (gbp->dont_learn) 1591 md->gbp |= VXLAN_GBP_DONT_LEARN; 1592 1593 if (gbp->policy_applied) 1594 md->gbp |= VXLAN_GBP_POLICY_APPLIED; 1595 1596 /* In flow-based mode, GBP is carried in dst_metadata */ 1597 if (!(vxflags & VXLAN_F_COLLECT_METADATA)) 1598 skb->mark = md->gbp; 1599 out: 1600 unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS; 1601 } 1602 1603 static bool vxlan_set_mac(struct vxlan_dev *vxlan, 1604 struct vxlan_sock *vs, 1605 struct sk_buff *skb, __be32 vni) 1606 { 1607 union vxlan_addr saddr; 1608 u32 ifindex = skb->dev->ifindex; 1609 1610 skb_reset_mac_header(skb); 1611 skb->protocol = eth_type_trans(skb, vxlan->dev); 1612 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 1613 1614 /* Ignore packet loops (and multicast echo) */ 1615 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr)) 1616 return false; 1617 1618 /* Get address from the outer IP header */ 1619 if (vxlan_get_sk_family(vs) == AF_INET) { 1620 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; 1621 saddr.sa.sa_family = AF_INET; 1622 #if IS_ENABLED(CONFIG_IPV6) 1623 } else { 1624 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr; 1625 saddr.sa.sa_family = AF_INET6; 1626 #endif 1627 } 1628 1629 if ((vxlan->cfg.flags & VXLAN_F_LEARN) && 1630 vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni)) 1631 return false; 1632 1633 return true; 1634 } 1635 1636 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph, 1637 struct sk_buff *skb) 1638 { 1639 int err = 0; 1640 1641 if (vxlan_get_sk_family(vs) == AF_INET) 1642 err = IP_ECN_decapsulate(oiph, skb); 1643 #if IS_ENABLED(CONFIG_IPV6) 1644 else 1645 err = IP6_ECN_decapsulate(oiph, skb); 1646 #endif 1647 1648 if (unlikely(err) && log_ecn_error) { 1649 if (vxlan_get_sk_family(vs) == AF_INET) 1650 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 1651 &((struct iphdr *)oiph)->saddr, 1652 ((struct iphdr *)oiph)->tos); 1653 else 1654 net_info_ratelimited("non-ECT from %pI6\n", 1655 &((struct ipv6hdr *)oiph)->saddr); 1656 } 1657 return err <= 1; 1658 } 1659 1660 /* Callback from net/ipv4/udp.c to receive packets */ 1661 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb) 1662 { 1663 struct vxlan_vni_node *vninode = NULL; 1664 struct vxlan_dev *vxlan; 1665 struct vxlan_sock *vs; 1666 struct vxlanhdr unparsed; 1667 struct vxlan_metadata _md; 1668 struct vxlan_metadata *md = &_md; 1669 __be16 protocol = htons(ETH_P_TEB); 1670 bool raw_proto = false; 1671 void *oiph; 1672 __be32 vni = 0; 1673 1674 /* Need UDP and VXLAN header to be present */ 1675 if (!pskb_may_pull(skb, VXLAN_HLEN)) 1676 goto drop; 1677 1678 unparsed = *vxlan_hdr(skb); 1679 /* VNI flag always required to be set */ 1680 if (!(unparsed.vx_flags & VXLAN_HF_VNI)) { 1681 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", 1682 ntohl(vxlan_hdr(skb)->vx_flags), 1683 ntohl(vxlan_hdr(skb)->vx_vni)); 1684 /* Return non vxlan pkt */ 1685 goto drop; 1686 } 1687 unparsed.vx_flags &= ~VXLAN_HF_VNI; 1688 unparsed.vx_vni &= ~VXLAN_VNI_MASK; 1689 1690 vs = rcu_dereference_sk_user_data(sk); 1691 if (!vs) 1692 goto drop; 1693 1694 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni); 1695 1696 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode); 1697 if (!vxlan) 1698 goto drop; 1699 1700 /* For backwards compatibility, only allow reserved fields to be 1701 * used by VXLAN extensions if explicitly requested. 1702 */ 1703 if (vs->flags & VXLAN_F_GPE) { 1704 if (!vxlan_parse_gpe_proto(&unparsed, &protocol)) 1705 goto drop; 1706 unparsed.vx_flags &= ~VXLAN_GPE_USED_BITS; 1707 raw_proto = true; 1708 } 1709 1710 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto, 1711 !net_eq(vxlan->net, dev_net(vxlan->dev)))) 1712 goto drop; 1713 1714 if (vs->flags & VXLAN_F_REMCSUM_RX) 1715 if (unlikely(!vxlan_remcsum(&unparsed, skb, vs->flags))) 1716 goto drop; 1717 1718 if (vxlan_collect_metadata(vs)) { 1719 struct metadata_dst *tun_dst; 1720 1721 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY, 1722 key32_to_tunnel_id(vni), sizeof(*md)); 1723 1724 if (!tun_dst) 1725 goto drop; 1726 1727 md = ip_tunnel_info_opts(&tun_dst->u.tun_info); 1728 1729 skb_dst_set(skb, (struct dst_entry *)tun_dst); 1730 } else { 1731 memset(md, 0, sizeof(*md)); 1732 } 1733 1734 if (vs->flags & VXLAN_F_GBP) 1735 vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md); 1736 /* Note that GBP and GPE can never be active together. This is 1737 * ensured in vxlan_dev_configure. 1738 */ 1739 1740 if (unparsed.vx_flags || unparsed.vx_vni) { 1741 /* If there are any unprocessed flags remaining treat 1742 * this as a malformed packet. This behavior diverges from 1743 * VXLAN RFC (RFC7348) which stipulates that bits in reserved 1744 * in reserved fields are to be ignored. The approach here 1745 * maintains compatibility with previous stack code, and also 1746 * is more robust and provides a little more security in 1747 * adding extensions to VXLAN. 1748 */ 1749 goto drop; 1750 } 1751 1752 if (!raw_proto) { 1753 if (!vxlan_set_mac(vxlan, vs, skb, vni)) 1754 goto drop; 1755 } else { 1756 skb_reset_mac_header(skb); 1757 skb->dev = vxlan->dev; 1758 skb->pkt_type = PACKET_HOST; 1759 } 1760 1761 oiph = skb_network_header(skb); 1762 skb_reset_network_header(skb); 1763 1764 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) { 1765 ++vxlan->dev->stats.rx_frame_errors; 1766 ++vxlan->dev->stats.rx_errors; 1767 vxlan_vnifilter_count(vxlan, vni, vninode, 1768 VXLAN_VNI_STATS_RX_ERRORS, 0); 1769 goto drop; 1770 } 1771 1772 rcu_read_lock(); 1773 1774 if (unlikely(!(vxlan->dev->flags & IFF_UP))) { 1775 rcu_read_unlock(); 1776 dev_core_stats_rx_dropped_inc(vxlan->dev); 1777 vxlan_vnifilter_count(vxlan, vni, vninode, 1778 VXLAN_VNI_STATS_RX_DROPS, 0); 1779 goto drop; 1780 } 1781 1782 dev_sw_netstats_rx_add(vxlan->dev, skb->len); 1783 vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len); 1784 gro_cells_receive(&vxlan->gro_cells, skb); 1785 1786 rcu_read_unlock(); 1787 1788 return 0; 1789 1790 drop: 1791 /* Consume bad packet */ 1792 kfree_skb(skb); 1793 return 0; 1794 } 1795 1796 /* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */ 1797 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) 1798 { 1799 struct vxlan_dev *vxlan; 1800 struct vxlan_sock *vs; 1801 struct vxlanhdr *hdr; 1802 __be32 vni; 1803 1804 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) 1805 return -EINVAL; 1806 1807 hdr = vxlan_hdr(skb); 1808 1809 if (!(hdr->vx_flags & VXLAN_HF_VNI)) 1810 return -EINVAL; 1811 1812 vs = rcu_dereference_sk_user_data(sk); 1813 if (!vs) 1814 return -ENOENT; 1815 1816 vni = vxlan_vni(hdr->vx_vni); 1817 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL); 1818 if (!vxlan) 1819 return -ENOENT; 1820 1821 return 0; 1822 } 1823 1824 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 1825 { 1826 struct vxlan_dev *vxlan = netdev_priv(dev); 1827 struct arphdr *parp; 1828 u8 *arpptr, *sha; 1829 __be32 sip, tip; 1830 struct neighbour *n; 1831 1832 if (dev->flags & IFF_NOARP) 1833 goto out; 1834 1835 if (!pskb_may_pull(skb, arp_hdr_len(dev))) { 1836 dev->stats.tx_dropped++; 1837 goto out; 1838 } 1839 parp = arp_hdr(skb); 1840 1841 if ((parp->ar_hrd != htons(ARPHRD_ETHER) && 1842 parp->ar_hrd != htons(ARPHRD_IEEE802)) || 1843 parp->ar_pro != htons(ETH_P_IP) || 1844 parp->ar_op != htons(ARPOP_REQUEST) || 1845 parp->ar_hln != dev->addr_len || 1846 parp->ar_pln != 4) 1847 goto out; 1848 arpptr = (u8 *)parp + sizeof(struct arphdr); 1849 sha = arpptr; 1850 arpptr += dev->addr_len; /* sha */ 1851 memcpy(&sip, arpptr, sizeof(sip)); 1852 arpptr += sizeof(sip); 1853 arpptr += dev->addr_len; /* tha */ 1854 memcpy(&tip, arpptr, sizeof(tip)); 1855 1856 if (ipv4_is_loopback(tip) || 1857 ipv4_is_multicast(tip)) 1858 goto out; 1859 1860 n = neigh_lookup(&arp_tbl, &tip, dev); 1861 1862 if (n) { 1863 struct vxlan_fdb *f; 1864 struct sk_buff *reply; 1865 1866 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 1867 neigh_release(n); 1868 goto out; 1869 } 1870 1871 f = vxlan_find_mac(vxlan, n->ha, vni); 1872 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 1873 /* bridge-local neighbor */ 1874 neigh_release(n); 1875 goto out; 1876 } 1877 1878 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, 1879 n->ha, sha); 1880 1881 neigh_release(n); 1882 1883 if (reply == NULL) 1884 goto out; 1885 1886 skb_reset_mac_header(reply); 1887 __skb_pull(reply, skb_network_offset(reply)); 1888 reply->ip_summed = CHECKSUM_UNNECESSARY; 1889 reply->pkt_type = PACKET_HOST; 1890 1891 if (netif_rx(reply) == NET_RX_DROP) { 1892 dev->stats.rx_dropped++; 1893 vxlan_vnifilter_count(vxlan, vni, NULL, 1894 VXLAN_VNI_STATS_RX_DROPS, 0); 1895 } 1896 1897 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 1898 union vxlan_addr ipa = { 1899 .sin.sin_addr.s_addr = tip, 1900 .sin.sin_family = AF_INET, 1901 }; 1902 1903 vxlan_ip_miss(dev, &ipa); 1904 } 1905 out: 1906 consume_skb(skb); 1907 return NETDEV_TX_OK; 1908 } 1909 1910 #if IS_ENABLED(CONFIG_IPV6) 1911 static struct sk_buff *vxlan_na_create(struct sk_buff *request, 1912 struct neighbour *n, bool isrouter) 1913 { 1914 struct net_device *dev = request->dev; 1915 struct sk_buff *reply; 1916 struct nd_msg *ns, *na; 1917 struct ipv6hdr *pip6; 1918 u8 *daddr; 1919 int na_olen = 8; /* opt hdr + ETH_ALEN for target */ 1920 int ns_olen; 1921 int i, len; 1922 1923 if (dev == NULL || !pskb_may_pull(request, request->len)) 1924 return NULL; 1925 1926 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + 1927 sizeof(*na) + na_olen + dev->needed_tailroom; 1928 reply = alloc_skb(len, GFP_ATOMIC); 1929 if (reply == NULL) 1930 return NULL; 1931 1932 reply->protocol = htons(ETH_P_IPV6); 1933 reply->dev = dev; 1934 skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); 1935 skb_push(reply, sizeof(struct ethhdr)); 1936 skb_reset_mac_header(reply); 1937 1938 ns = (struct nd_msg *)(ipv6_hdr(request) + 1); 1939 1940 daddr = eth_hdr(request)->h_source; 1941 ns_olen = request->len - skb_network_offset(request) - 1942 sizeof(struct ipv6hdr) - sizeof(*ns); 1943 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { 1944 if (!ns->opt[i + 1]) { 1945 kfree_skb(reply); 1946 return NULL; 1947 } 1948 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { 1949 daddr = ns->opt + i + sizeof(struct nd_opt_hdr); 1950 break; 1951 } 1952 } 1953 1954 /* Ethernet header */ 1955 ether_addr_copy(eth_hdr(reply)->h_dest, daddr); 1956 ether_addr_copy(eth_hdr(reply)->h_source, n->ha); 1957 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); 1958 reply->protocol = htons(ETH_P_IPV6); 1959 1960 skb_pull(reply, sizeof(struct ethhdr)); 1961 skb_reset_network_header(reply); 1962 skb_put(reply, sizeof(struct ipv6hdr)); 1963 1964 /* IPv6 header */ 1965 1966 pip6 = ipv6_hdr(reply); 1967 memset(pip6, 0, sizeof(struct ipv6hdr)); 1968 pip6->version = 6; 1969 pip6->priority = ipv6_hdr(request)->priority; 1970 pip6->nexthdr = IPPROTO_ICMPV6; 1971 pip6->hop_limit = 255; 1972 pip6->daddr = ipv6_hdr(request)->saddr; 1973 pip6->saddr = *(struct in6_addr *)n->primary_key; 1974 1975 skb_pull(reply, sizeof(struct ipv6hdr)); 1976 skb_reset_transport_header(reply); 1977 1978 /* Neighbor Advertisement */ 1979 na = skb_put_zero(reply, sizeof(*na) + na_olen); 1980 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; 1981 na->icmph.icmp6_router = isrouter; 1982 na->icmph.icmp6_override = 1; 1983 na->icmph.icmp6_solicited = 1; 1984 na->target = ns->target; 1985 ether_addr_copy(&na->opt[2], n->ha); 1986 na->opt[0] = ND_OPT_TARGET_LL_ADDR; 1987 na->opt[1] = na_olen >> 3; 1988 1989 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, 1990 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, 1991 csum_partial(na, sizeof(*na)+na_olen, 0)); 1992 1993 pip6->payload_len = htons(sizeof(*na)+na_olen); 1994 1995 skb_push(reply, sizeof(struct ipv6hdr)); 1996 1997 reply->ip_summed = CHECKSUM_UNNECESSARY; 1998 1999 return reply; 2000 } 2001 2002 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 2003 { 2004 struct vxlan_dev *vxlan = netdev_priv(dev); 2005 const struct in6_addr *daddr; 2006 const struct ipv6hdr *iphdr; 2007 struct inet6_dev *in6_dev; 2008 struct neighbour *n; 2009 struct nd_msg *msg; 2010 2011 rcu_read_lock(); 2012 in6_dev = __in6_dev_get(dev); 2013 if (!in6_dev) 2014 goto out; 2015 2016 iphdr = ipv6_hdr(skb); 2017 daddr = &iphdr->daddr; 2018 msg = (struct nd_msg *)(iphdr + 1); 2019 2020 if (ipv6_addr_loopback(daddr) || 2021 ipv6_addr_is_multicast(&msg->target)) 2022 goto out; 2023 2024 n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev); 2025 2026 if (n) { 2027 struct vxlan_fdb *f; 2028 struct sk_buff *reply; 2029 2030 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 2031 neigh_release(n); 2032 goto out; 2033 } 2034 2035 f = vxlan_find_mac(vxlan, n->ha, vni); 2036 if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) { 2037 /* bridge-local neighbor */ 2038 neigh_release(n); 2039 goto out; 2040 } 2041 2042 reply = vxlan_na_create(skb, n, 2043 !!(f ? f->flags & NTF_ROUTER : 0)); 2044 2045 neigh_release(n); 2046 2047 if (reply == NULL) 2048 goto out; 2049 2050 if (netif_rx(reply) == NET_RX_DROP) { 2051 dev->stats.rx_dropped++; 2052 vxlan_vnifilter_count(vxlan, vni, NULL, 2053 VXLAN_VNI_STATS_RX_DROPS, 0); 2054 } 2055 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 2056 union vxlan_addr ipa = { 2057 .sin6.sin6_addr = msg->target, 2058 .sin6.sin6_family = AF_INET6, 2059 }; 2060 2061 vxlan_ip_miss(dev, &ipa); 2062 } 2063 2064 out: 2065 rcu_read_unlock(); 2066 consume_skb(skb); 2067 return NETDEV_TX_OK; 2068 } 2069 #endif 2070 2071 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) 2072 { 2073 struct vxlan_dev *vxlan = netdev_priv(dev); 2074 struct neighbour *n; 2075 2076 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) 2077 return false; 2078 2079 n = NULL; 2080 switch (ntohs(eth_hdr(skb)->h_proto)) { 2081 case ETH_P_IP: 2082 { 2083 struct iphdr *pip; 2084 2085 if (!pskb_may_pull(skb, sizeof(struct iphdr))) 2086 return false; 2087 pip = ip_hdr(skb); 2088 n = neigh_lookup(&arp_tbl, &pip->daddr, dev); 2089 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2090 union vxlan_addr ipa = { 2091 .sin.sin_addr.s_addr = pip->daddr, 2092 .sin.sin_family = AF_INET, 2093 }; 2094 2095 vxlan_ip_miss(dev, &ipa); 2096 return false; 2097 } 2098 2099 break; 2100 } 2101 #if IS_ENABLED(CONFIG_IPV6) 2102 case ETH_P_IPV6: 2103 { 2104 struct ipv6hdr *pip6; 2105 2106 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) 2107 return false; 2108 pip6 = ipv6_hdr(skb); 2109 n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev); 2110 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2111 union vxlan_addr ipa = { 2112 .sin6.sin6_addr = pip6->daddr, 2113 .sin6.sin6_family = AF_INET6, 2114 }; 2115 2116 vxlan_ip_miss(dev, &ipa); 2117 return false; 2118 } 2119 2120 break; 2121 } 2122 #endif 2123 default: 2124 return false; 2125 } 2126 2127 if (n) { 2128 bool diff; 2129 2130 diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha); 2131 if (diff) { 2132 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, 2133 dev->addr_len); 2134 memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len); 2135 } 2136 neigh_release(n); 2137 return diff; 2138 } 2139 2140 return false; 2141 } 2142 2143 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol) 2144 { 2145 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh; 2146 2147 gpe->np_applied = 1; 2148 gpe->next_protocol = tun_p_from_eth_p(protocol); 2149 if (!gpe->next_protocol) 2150 return -EPFNOSUPPORT; 2151 return 0; 2152 } 2153 2154 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst, 2155 int iphdr_len, __be32 vni, 2156 struct vxlan_metadata *md, u32 vxflags, 2157 bool udp_sum) 2158 { 2159 struct vxlanhdr *vxh; 2160 int min_headroom; 2161 int err; 2162 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 2163 __be16 inner_protocol = htons(ETH_P_TEB); 2164 2165 if ((vxflags & VXLAN_F_REMCSUM_TX) && 2166 skb->ip_summed == CHECKSUM_PARTIAL) { 2167 int csum_start = skb_checksum_start_offset(skb); 2168 2169 if (csum_start <= VXLAN_MAX_REMCSUM_START && 2170 !(csum_start & VXLAN_RCO_SHIFT_MASK) && 2171 (skb->csum_offset == offsetof(struct udphdr, check) || 2172 skb->csum_offset == offsetof(struct tcphdr, check))) 2173 type |= SKB_GSO_TUNNEL_REMCSUM; 2174 } 2175 2176 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 2177 + VXLAN_HLEN + iphdr_len; 2178 2179 /* Need space for new headers (invalidates iph ptr) */ 2180 err = skb_cow_head(skb, min_headroom); 2181 if (unlikely(err)) 2182 return err; 2183 2184 err = iptunnel_handle_offloads(skb, type); 2185 if (err) 2186 return err; 2187 2188 vxh = __skb_push(skb, sizeof(*vxh)); 2189 vxh->vx_flags = VXLAN_HF_VNI; 2190 vxh->vx_vni = vxlan_vni_field(vni); 2191 2192 if (type & SKB_GSO_TUNNEL_REMCSUM) { 2193 unsigned int start; 2194 2195 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr); 2196 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset); 2197 vxh->vx_flags |= VXLAN_HF_RCO; 2198 2199 if (!skb_is_gso(skb)) { 2200 skb->ip_summed = CHECKSUM_NONE; 2201 skb->encapsulation = 0; 2202 } 2203 } 2204 2205 if (vxflags & VXLAN_F_GBP) 2206 vxlan_build_gbp_hdr(vxh, md); 2207 if (vxflags & VXLAN_F_GPE) { 2208 err = vxlan_build_gpe_hdr(vxh, skb->protocol); 2209 if (err < 0) 2210 return err; 2211 inner_protocol = skb->protocol; 2212 } 2213 2214 skb_set_inner_protocol(skb, inner_protocol); 2215 return 0; 2216 } 2217 2218 /* Bypass encapsulation if the destination is local */ 2219 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, 2220 struct vxlan_dev *dst_vxlan, __be32 vni, 2221 bool snoop) 2222 { 2223 union vxlan_addr loopback; 2224 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; 2225 struct net_device *dev; 2226 int len = skb->len; 2227 2228 skb->pkt_type = PACKET_HOST; 2229 skb->encapsulation = 0; 2230 skb->dev = dst_vxlan->dev; 2231 __skb_pull(skb, skb_network_offset(skb)); 2232 2233 if (remote_ip->sa.sa_family == AF_INET) { 2234 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 2235 loopback.sa.sa_family = AF_INET; 2236 #if IS_ENABLED(CONFIG_IPV6) 2237 } else { 2238 loopback.sin6.sin6_addr = in6addr_loopback; 2239 loopback.sa.sa_family = AF_INET6; 2240 #endif 2241 } 2242 2243 rcu_read_lock(); 2244 dev = skb->dev; 2245 if (unlikely(!(dev->flags & IFF_UP))) { 2246 kfree_skb(skb); 2247 goto drop; 2248 } 2249 2250 if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop) 2251 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni); 2252 2253 dev_sw_netstats_tx_add(src_vxlan->dev, 1, len); 2254 vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len); 2255 2256 if (__netif_rx(skb) == NET_RX_SUCCESS) { 2257 dev_sw_netstats_rx_add(dst_vxlan->dev, len); 2258 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX, 2259 len); 2260 } else { 2261 drop: 2262 dev->stats.rx_dropped++; 2263 vxlan_vnifilter_count(dst_vxlan, vni, NULL, 2264 VXLAN_VNI_STATS_RX_DROPS, 0); 2265 } 2266 rcu_read_unlock(); 2267 } 2268 2269 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev, 2270 struct vxlan_dev *vxlan, 2271 int addr_family, 2272 __be16 dst_port, int dst_ifindex, __be32 vni, 2273 struct dst_entry *dst, 2274 u32 rt_flags) 2275 { 2276 #if IS_ENABLED(CONFIG_IPV6) 2277 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of 2278 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple 2279 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry. 2280 */ 2281 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL); 2282 #endif 2283 /* Bypass encapsulation if the destination is local */ 2284 if (rt_flags & RTCF_LOCAL && 2285 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && 2286 vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) { 2287 struct vxlan_dev *dst_vxlan; 2288 2289 dst_release(dst); 2290 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni, 2291 addr_family, dst_port, 2292 vxlan->cfg.flags); 2293 if (!dst_vxlan) { 2294 dev->stats.tx_errors++; 2295 vxlan_vnifilter_count(vxlan, vni, NULL, 2296 VXLAN_VNI_STATS_TX_ERRORS, 0); 2297 kfree_skb(skb); 2298 2299 return -ENOENT; 2300 } 2301 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true); 2302 return 1; 2303 } 2304 2305 return 0; 2306 } 2307 2308 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 2309 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc) 2310 { 2311 struct dst_cache *dst_cache; 2312 struct ip_tunnel_info *info; 2313 struct ip_tunnel_key *pkey; 2314 struct ip_tunnel_key key; 2315 struct vxlan_dev *vxlan = netdev_priv(dev); 2316 const struct iphdr *old_iph = ip_hdr(skb); 2317 struct vxlan_metadata _md; 2318 struct vxlan_metadata *md = &_md; 2319 unsigned int pkt_len = skb->len; 2320 __be16 src_port = 0, dst_port; 2321 struct dst_entry *ndst = NULL; 2322 int addr_family; 2323 __u8 tos, ttl; 2324 int ifindex; 2325 int err; 2326 u32 flags = vxlan->cfg.flags; 2327 bool use_cache; 2328 bool udp_sum = false; 2329 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); 2330 __be32 vni = 0; 2331 2332 info = skb_tunnel_info(skb); 2333 use_cache = ip_tunnel_dst_cache_usable(skb, info); 2334 2335 if (rdst) { 2336 memset(&key, 0, sizeof(key)); 2337 pkey = &key; 2338 2339 if (vxlan_addr_any(&rdst->remote_ip)) { 2340 if (did_rsc) { 2341 /* short-circuited back to local bridge */ 2342 vxlan_encap_bypass(skb, vxlan, vxlan, 2343 default_vni, true); 2344 return; 2345 } 2346 goto drop; 2347 } 2348 2349 addr_family = vxlan->cfg.saddr.sa.sa_family; 2350 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; 2351 vni = (rdst->remote_vni) ? : default_vni; 2352 ifindex = rdst->remote_ifindex; 2353 2354 if (addr_family == AF_INET) { 2355 key.u.ipv4.src = vxlan->cfg.saddr.sin.sin_addr.s_addr; 2356 key.u.ipv4.dst = rdst->remote_ip.sin.sin_addr.s_addr; 2357 } else { 2358 key.u.ipv6.src = vxlan->cfg.saddr.sin6.sin6_addr; 2359 key.u.ipv6.dst = rdst->remote_ip.sin6.sin6_addr; 2360 } 2361 2362 dst_cache = &rdst->dst_cache; 2363 md->gbp = skb->mark; 2364 if (flags & VXLAN_F_TTL_INHERIT) { 2365 ttl = ip_tunnel_get_ttl(old_iph, skb); 2366 } else { 2367 ttl = vxlan->cfg.ttl; 2368 if (!ttl && vxlan_addr_multicast(&rdst->remote_ip)) 2369 ttl = 1; 2370 } 2371 tos = vxlan->cfg.tos; 2372 if (tos == 1) 2373 tos = ip_tunnel_get_dsfield(old_iph, skb); 2374 if (tos && !info) 2375 use_cache = false; 2376 2377 if (addr_family == AF_INET) 2378 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX); 2379 else 2380 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX); 2381 #if IS_ENABLED(CONFIG_IPV6) 2382 switch (vxlan->cfg.label_policy) { 2383 case VXLAN_LABEL_FIXED: 2384 key.label = vxlan->cfg.label; 2385 break; 2386 case VXLAN_LABEL_INHERIT: 2387 key.label = ip_tunnel_get_flowlabel(old_iph, skb); 2388 break; 2389 default: 2390 DEBUG_NET_WARN_ON_ONCE(1); 2391 goto drop; 2392 } 2393 #endif 2394 } else { 2395 if (!info) { 2396 WARN_ONCE(1, "%s: Missing encapsulation instructions\n", 2397 dev->name); 2398 goto drop; 2399 } 2400 pkey = &info->key; 2401 addr_family = ip_tunnel_info_af(info); 2402 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; 2403 vni = tunnel_id_to_key32(info->key.tun_id); 2404 ifindex = 0; 2405 dst_cache = &info->dst_cache; 2406 if (info->key.tun_flags & TUNNEL_VXLAN_OPT) { 2407 if (info->options_len < sizeof(*md)) 2408 goto drop; 2409 md = ip_tunnel_info_opts(info); 2410 } 2411 ttl = info->key.ttl; 2412 tos = info->key.tos; 2413 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 2414 } 2415 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 2416 vxlan->cfg.port_max, true); 2417 2418 rcu_read_lock(); 2419 if (addr_family == AF_INET) { 2420 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 2421 struct rtable *rt; 2422 __be16 df = 0; 2423 __be32 saddr; 2424 2425 if (!ifindex) 2426 ifindex = sock4->sock->sk->sk_bound_dev_if; 2427 2428 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, ifindex, 2429 &saddr, pkey, src_port, dst_port, 2430 tos, use_cache ? dst_cache : NULL); 2431 if (IS_ERR(rt)) { 2432 err = PTR_ERR(rt); 2433 goto tx_error; 2434 } 2435 2436 if (!info) { 2437 /* Bypass encapsulation if the destination is local */ 2438 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET, 2439 dst_port, ifindex, vni, 2440 &rt->dst, rt->rt_flags); 2441 if (err) 2442 goto out_unlock; 2443 2444 if (vxlan->cfg.df == VXLAN_DF_SET) { 2445 df = htons(IP_DF); 2446 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { 2447 struct ethhdr *eth = eth_hdr(skb); 2448 2449 if (ntohs(eth->h_proto) == ETH_P_IPV6 || 2450 (ntohs(eth->h_proto) == ETH_P_IP && 2451 old_iph->frag_off & htons(IP_DF))) 2452 df = htons(IP_DF); 2453 } 2454 } else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) { 2455 df = htons(IP_DF); 2456 } 2457 2458 ndst = &rt->dst; 2459 err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE), 2460 netif_is_any_bridge_port(dev)); 2461 if (err < 0) { 2462 goto tx_error; 2463 } else if (err) { 2464 if (info) { 2465 struct ip_tunnel_info *unclone; 2466 2467 unclone = skb_tunnel_info_unclone(skb); 2468 if (unlikely(!unclone)) 2469 goto tx_error; 2470 2471 unclone->key.u.ipv4.src = pkey->u.ipv4.dst; 2472 unclone->key.u.ipv4.dst = saddr; 2473 } 2474 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2475 dst_release(ndst); 2476 goto out_unlock; 2477 } 2478 2479 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2480 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 2481 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr), 2482 vni, md, flags, udp_sum); 2483 if (err < 0) 2484 goto tx_error; 2485 2486 udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, saddr, 2487 pkey->u.ipv4.dst, tos, ttl, df, 2488 src_port, dst_port, xnet, !udp_sum); 2489 #if IS_ENABLED(CONFIG_IPV6) 2490 } else { 2491 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 2492 struct in6_addr saddr; 2493 2494 if (!ifindex) 2495 ifindex = sock6->sock->sk->sk_bound_dev_if; 2496 2497 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 2498 ifindex, &saddr, pkey, 2499 src_port, dst_port, tos, 2500 use_cache ? dst_cache : NULL); 2501 if (IS_ERR(ndst)) { 2502 err = PTR_ERR(ndst); 2503 ndst = NULL; 2504 goto tx_error; 2505 } 2506 2507 if (!info) { 2508 u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags; 2509 2510 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET6, 2511 dst_port, ifindex, vni, 2512 ndst, rt6i_flags); 2513 if (err) 2514 goto out_unlock; 2515 } 2516 2517 err = skb_tunnel_check_pmtu(skb, ndst, 2518 vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6), 2519 netif_is_any_bridge_port(dev)); 2520 if (err < 0) { 2521 goto tx_error; 2522 } else if (err) { 2523 if (info) { 2524 struct ip_tunnel_info *unclone; 2525 2526 unclone = skb_tunnel_info_unclone(skb); 2527 if (unlikely(!unclone)) 2528 goto tx_error; 2529 2530 unclone->key.u.ipv6.src = pkey->u.ipv6.dst; 2531 unclone->key.u.ipv6.dst = saddr; 2532 } 2533 2534 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2535 dst_release(ndst); 2536 goto out_unlock; 2537 } 2538 2539 tos = ip_tunnel_ecn_encap(tos, old_iph, skb); 2540 ttl = ttl ? : ip6_dst_hoplimit(ndst); 2541 skb_scrub_packet(skb, xnet); 2542 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr), 2543 vni, md, flags, udp_sum); 2544 if (err < 0) 2545 goto tx_error; 2546 2547 udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev, 2548 &saddr, &pkey->u.ipv6.dst, tos, ttl, 2549 pkey->label, src_port, dst_port, !udp_sum); 2550 #endif 2551 } 2552 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len); 2553 out_unlock: 2554 rcu_read_unlock(); 2555 return; 2556 2557 drop: 2558 dev->stats.tx_dropped++; 2559 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0); 2560 dev_kfree_skb(skb); 2561 return; 2562 2563 tx_error: 2564 rcu_read_unlock(); 2565 if (err == -ELOOP) 2566 dev->stats.collisions++; 2567 else if (err == -ENETUNREACH) 2568 dev->stats.tx_carrier_errors++; 2569 dst_release(ndst); 2570 dev->stats.tx_errors++; 2571 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0); 2572 kfree_skb(skb); 2573 } 2574 2575 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev, 2576 struct vxlan_fdb *f, __be32 vni, bool did_rsc) 2577 { 2578 struct vxlan_rdst nh_rdst; 2579 struct nexthop *nh; 2580 bool do_xmit; 2581 u32 hash; 2582 2583 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2584 hash = skb_get_hash(skb); 2585 2586 rcu_read_lock(); 2587 nh = rcu_dereference(f->nh); 2588 if (!nh) { 2589 rcu_read_unlock(); 2590 goto drop; 2591 } 2592 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2593 rcu_read_unlock(); 2594 2595 if (likely(do_xmit)) 2596 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc); 2597 else 2598 goto drop; 2599 2600 return; 2601 2602 drop: 2603 dev->stats.tx_dropped++; 2604 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2605 VXLAN_VNI_STATS_TX_DROPS, 0); 2606 dev_kfree_skb(skb); 2607 } 2608 2609 static netdev_tx_t vxlan_xmit_nhid(struct sk_buff *skb, struct net_device *dev, 2610 u32 nhid, __be32 vni) 2611 { 2612 struct vxlan_dev *vxlan = netdev_priv(dev); 2613 struct vxlan_rdst nh_rdst; 2614 struct nexthop *nh; 2615 bool do_xmit; 2616 u32 hash; 2617 2618 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2619 hash = skb_get_hash(skb); 2620 2621 rcu_read_lock(); 2622 nh = nexthop_find_by_id(dev_net(dev), nhid); 2623 if (unlikely(!nh || !nexthop_is_fdb(nh) || !nexthop_is_multipath(nh))) { 2624 rcu_read_unlock(); 2625 goto drop; 2626 } 2627 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2628 rcu_read_unlock(); 2629 2630 if (vxlan->cfg.saddr.sa.sa_family != nh_rdst.remote_ip.sa.sa_family) 2631 goto drop; 2632 2633 if (likely(do_xmit)) 2634 vxlan_xmit_one(skb, dev, vni, &nh_rdst, false); 2635 else 2636 goto drop; 2637 2638 return NETDEV_TX_OK; 2639 2640 drop: 2641 dev->stats.tx_dropped++; 2642 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2643 VXLAN_VNI_STATS_TX_DROPS, 0); 2644 dev_kfree_skb(skb); 2645 return NETDEV_TX_OK; 2646 } 2647 2648 /* Transmit local packets over Vxlan 2649 * 2650 * Outer IP header inherits ECN and DF from inner header. 2651 * Outer UDP destination is the VXLAN assigned port. 2652 * source port is based on hash of flow 2653 */ 2654 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) 2655 { 2656 struct vxlan_dev *vxlan = netdev_priv(dev); 2657 struct vxlan_rdst *rdst, *fdst = NULL; 2658 const struct ip_tunnel_info *info; 2659 bool did_rsc = false; 2660 struct vxlan_fdb *f; 2661 struct ethhdr *eth; 2662 __be32 vni = 0; 2663 u32 nhid = 0; 2664 2665 info = skb_tunnel_info(skb); 2666 2667 skb_reset_mac_header(skb); 2668 2669 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 2670 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE && 2671 info->mode & IP_TUNNEL_INFO_TX) { 2672 vni = tunnel_id_to_key32(info->key.tun_id); 2673 nhid = info->key.nhid; 2674 } else { 2675 if (info && info->mode & IP_TUNNEL_INFO_TX) 2676 vxlan_xmit_one(skb, dev, vni, NULL, false); 2677 else 2678 kfree_skb(skb); 2679 return NETDEV_TX_OK; 2680 } 2681 } 2682 2683 if (vxlan->cfg.flags & VXLAN_F_PROXY) { 2684 eth = eth_hdr(skb); 2685 if (ntohs(eth->h_proto) == ETH_P_ARP) 2686 return arp_reduce(dev, skb, vni); 2687 #if IS_ENABLED(CONFIG_IPV6) 2688 else if (ntohs(eth->h_proto) == ETH_P_IPV6 && 2689 pskb_may_pull(skb, sizeof(struct ipv6hdr) + 2690 sizeof(struct nd_msg)) && 2691 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { 2692 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1); 2693 2694 if (m->icmph.icmp6_code == 0 && 2695 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) 2696 return neigh_reduce(dev, skb, vni); 2697 } 2698 #endif 2699 } 2700 2701 if (nhid) 2702 return vxlan_xmit_nhid(skb, dev, nhid, vni); 2703 2704 if (vxlan->cfg.flags & VXLAN_F_MDB) { 2705 struct vxlan_mdb_entry *mdb_entry; 2706 2707 rcu_read_lock(); 2708 mdb_entry = vxlan_mdb_entry_skb_get(vxlan, skb, vni); 2709 if (mdb_entry) { 2710 netdev_tx_t ret; 2711 2712 ret = vxlan_mdb_xmit(vxlan, mdb_entry, skb); 2713 rcu_read_unlock(); 2714 return ret; 2715 } 2716 rcu_read_unlock(); 2717 } 2718 2719 eth = eth_hdr(skb); 2720 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2721 did_rsc = false; 2722 2723 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) && 2724 (ntohs(eth->h_proto) == ETH_P_IP || 2725 ntohs(eth->h_proto) == ETH_P_IPV6)) { 2726 did_rsc = route_shortcircuit(dev, skb); 2727 if (did_rsc) 2728 f = vxlan_find_mac(vxlan, eth->h_dest, vni); 2729 } 2730 2731 if (f == NULL) { 2732 f = vxlan_find_mac(vxlan, all_zeros_mac, vni); 2733 if (f == NULL) { 2734 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) && 2735 !is_multicast_ether_addr(eth->h_dest)) 2736 vxlan_fdb_miss(vxlan, eth->h_dest); 2737 2738 dev->stats.tx_dropped++; 2739 vxlan_vnifilter_count(vxlan, vni, NULL, 2740 VXLAN_VNI_STATS_TX_DROPS, 0); 2741 kfree_skb(skb); 2742 return NETDEV_TX_OK; 2743 } 2744 } 2745 2746 if (rcu_access_pointer(f->nh)) { 2747 vxlan_xmit_nh(skb, dev, f, 2748 (vni ? : vxlan->default_dst.remote_vni), did_rsc); 2749 } else { 2750 list_for_each_entry_rcu(rdst, &f->remotes, list) { 2751 struct sk_buff *skb1; 2752 2753 if (!fdst) { 2754 fdst = rdst; 2755 continue; 2756 } 2757 skb1 = skb_clone(skb, GFP_ATOMIC); 2758 if (skb1) 2759 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc); 2760 } 2761 if (fdst) 2762 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc); 2763 else 2764 kfree_skb(skb); 2765 } 2766 2767 return NETDEV_TX_OK; 2768 } 2769 2770 /* Walk the forwarding table and purge stale entries */ 2771 static void vxlan_cleanup(struct timer_list *t) 2772 { 2773 struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer); 2774 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; 2775 unsigned int h; 2776 2777 if (!netif_running(vxlan->dev)) 2778 return; 2779 2780 for (h = 0; h < FDB_HASH_SIZE; ++h) { 2781 struct hlist_node *p, *n; 2782 2783 spin_lock(&vxlan->hash_lock[h]); 2784 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 2785 struct vxlan_fdb *f 2786 = container_of(p, struct vxlan_fdb, hlist); 2787 unsigned long timeout; 2788 2789 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 2790 continue; 2791 2792 if (f->flags & NTF_EXT_LEARNED) 2793 continue; 2794 2795 timeout = f->used + vxlan->cfg.age_interval * HZ; 2796 if (time_before_eq(timeout, jiffies)) { 2797 netdev_dbg(vxlan->dev, 2798 "garbage collect %pM\n", 2799 f->eth_addr); 2800 f->state = NUD_STALE; 2801 vxlan_fdb_destroy(vxlan, f, true, true); 2802 } else if (time_before(timeout, next_timer)) 2803 next_timer = timeout; 2804 } 2805 spin_unlock(&vxlan->hash_lock[h]); 2806 } 2807 2808 mod_timer(&vxlan->age_timer, next_timer); 2809 } 2810 2811 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan) 2812 { 2813 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2814 2815 spin_lock(&vn->sock_lock); 2816 hlist_del_init_rcu(&vxlan->hlist4.hlist); 2817 #if IS_ENABLED(CONFIG_IPV6) 2818 hlist_del_init_rcu(&vxlan->hlist6.hlist); 2819 #endif 2820 spin_unlock(&vn->sock_lock); 2821 } 2822 2823 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan, 2824 struct vxlan_dev_node *node) 2825 { 2826 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 2827 __be32 vni = vxlan->default_dst.remote_vni; 2828 2829 node->vxlan = vxlan; 2830 spin_lock(&vn->sock_lock); 2831 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni)); 2832 spin_unlock(&vn->sock_lock); 2833 } 2834 2835 /* Setup stats when device is created */ 2836 static int vxlan_init(struct net_device *dev) 2837 { 2838 struct vxlan_dev *vxlan = netdev_priv(dev); 2839 int err; 2840 2841 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2842 vxlan_vnigroup_init(vxlan); 2843 2844 err = gro_cells_init(&vxlan->gro_cells, dev); 2845 if (err) 2846 goto err_vnigroup_uninit; 2847 2848 err = vxlan_mdb_init(vxlan); 2849 if (err) 2850 goto err_gro_cells_destroy; 2851 2852 netdev_lockdep_set_classes(dev); 2853 return 0; 2854 2855 err_gro_cells_destroy: 2856 gro_cells_destroy(&vxlan->gro_cells); 2857 err_vnigroup_uninit: 2858 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2859 vxlan_vnigroup_uninit(vxlan); 2860 return err; 2861 } 2862 2863 static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni) 2864 { 2865 struct vxlan_fdb *f; 2866 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni); 2867 2868 spin_lock_bh(&vxlan->hash_lock[hash_index]); 2869 f = __vxlan_find_mac(vxlan, all_zeros_mac, vni); 2870 if (f) 2871 vxlan_fdb_destroy(vxlan, f, true, true); 2872 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 2873 } 2874 2875 static void vxlan_uninit(struct net_device *dev) 2876 { 2877 struct vxlan_dev *vxlan = netdev_priv(dev); 2878 2879 vxlan_mdb_fini(vxlan); 2880 2881 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2882 vxlan_vnigroup_uninit(vxlan); 2883 2884 gro_cells_destroy(&vxlan->gro_cells); 2885 2886 vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni); 2887 } 2888 2889 /* Start ageing timer and join group when device is brought up */ 2890 static int vxlan_open(struct net_device *dev) 2891 { 2892 struct vxlan_dev *vxlan = netdev_priv(dev); 2893 int ret; 2894 2895 ret = vxlan_sock_add(vxlan); 2896 if (ret < 0) 2897 return ret; 2898 2899 ret = vxlan_multicast_join(vxlan); 2900 if (ret) { 2901 vxlan_sock_release(vxlan); 2902 return ret; 2903 } 2904 2905 if (vxlan->cfg.age_interval) 2906 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); 2907 2908 return ret; 2909 } 2910 2911 struct vxlan_fdb_flush_desc { 2912 bool ignore_default_entry; 2913 unsigned long state; 2914 unsigned long state_mask; 2915 unsigned long flags; 2916 unsigned long flags_mask; 2917 __be32 src_vni; 2918 u32 nhid; 2919 __be32 vni; 2920 __be16 port; 2921 union vxlan_addr dst_ip; 2922 }; 2923 2924 static bool vxlan_fdb_is_default_entry(const struct vxlan_fdb *f, 2925 const struct vxlan_dev *vxlan) 2926 { 2927 return is_zero_ether_addr(f->eth_addr) && f->vni == vxlan->cfg.vni; 2928 } 2929 2930 static bool vxlan_fdb_nhid_matches(const struct vxlan_fdb *f, u32 nhid) 2931 { 2932 struct nexthop *nh = rtnl_dereference(f->nh); 2933 2934 return nh && nh->id == nhid; 2935 } 2936 2937 static bool vxlan_fdb_flush_matches(const struct vxlan_fdb *f, 2938 const struct vxlan_dev *vxlan, 2939 const struct vxlan_fdb_flush_desc *desc) 2940 { 2941 if (desc->state_mask && (f->state & desc->state_mask) != desc->state) 2942 return false; 2943 2944 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags) 2945 return false; 2946 2947 if (desc->ignore_default_entry && vxlan_fdb_is_default_entry(f, vxlan)) 2948 return false; 2949 2950 if (desc->src_vni && f->vni != desc->src_vni) 2951 return false; 2952 2953 if (desc->nhid && !vxlan_fdb_nhid_matches(f, desc->nhid)) 2954 return false; 2955 2956 return true; 2957 } 2958 2959 static bool 2960 vxlan_fdb_flush_should_match_remotes(const struct vxlan_fdb_flush_desc *desc) 2961 { 2962 return desc->vni || desc->port || desc->dst_ip.sa.sa_family; 2963 } 2964 2965 static bool 2966 vxlan_fdb_flush_remote_matches(const struct vxlan_fdb_flush_desc *desc, 2967 const struct vxlan_rdst *rd) 2968 { 2969 if (desc->vni && rd->remote_vni != desc->vni) 2970 return false; 2971 2972 if (desc->port && rd->remote_port != desc->port) 2973 return false; 2974 2975 if (desc->dst_ip.sa.sa_family && 2976 !vxlan_addr_equal(&rd->remote_ip, &desc->dst_ip)) 2977 return false; 2978 2979 return true; 2980 } 2981 2982 static void 2983 vxlan_fdb_flush_match_remotes(struct vxlan_fdb *f, struct vxlan_dev *vxlan, 2984 const struct vxlan_fdb_flush_desc *desc, 2985 bool *p_destroy_fdb) 2986 { 2987 bool remotes_flushed = false; 2988 struct vxlan_rdst *rd, *tmp; 2989 2990 list_for_each_entry_safe(rd, tmp, &f->remotes, list) { 2991 if (!vxlan_fdb_flush_remote_matches(desc, rd)) 2992 continue; 2993 2994 vxlan_fdb_dst_destroy(vxlan, f, rd, true); 2995 remotes_flushed = true; 2996 } 2997 2998 *p_destroy_fdb = remotes_flushed && list_empty(&f->remotes); 2999 } 3000 3001 /* Purge the forwarding table */ 3002 static void vxlan_flush(struct vxlan_dev *vxlan, 3003 const struct vxlan_fdb_flush_desc *desc) 3004 { 3005 bool match_remotes = vxlan_fdb_flush_should_match_remotes(desc); 3006 unsigned int h; 3007 3008 for (h = 0; h < FDB_HASH_SIZE; ++h) { 3009 struct hlist_node *p, *n; 3010 3011 spin_lock_bh(&vxlan->hash_lock[h]); 3012 hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) { 3013 struct vxlan_fdb *f 3014 = container_of(p, struct vxlan_fdb, hlist); 3015 3016 if (!vxlan_fdb_flush_matches(f, vxlan, desc)) 3017 continue; 3018 3019 if (match_remotes) { 3020 bool destroy_fdb = false; 3021 3022 vxlan_fdb_flush_match_remotes(f, vxlan, desc, 3023 &destroy_fdb); 3024 3025 if (!destroy_fdb) 3026 continue; 3027 } 3028 3029 vxlan_fdb_destroy(vxlan, f, true, true); 3030 } 3031 spin_unlock_bh(&vxlan->hash_lock[h]); 3032 } 3033 } 3034 3035 static const struct nla_policy vxlan_del_bulk_policy[NDA_MAX + 1] = { 3036 [NDA_SRC_VNI] = { .type = NLA_U32 }, 3037 [NDA_NH_ID] = { .type = NLA_U32 }, 3038 [NDA_VNI] = { .type = NLA_U32 }, 3039 [NDA_PORT] = { .type = NLA_U16 }, 3040 [NDA_DST] = NLA_POLICY_RANGE(NLA_BINARY, sizeof(struct in_addr), 3041 sizeof(struct in6_addr)), 3042 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, 3043 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, 3044 }; 3045 3046 #define VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS (NTF_MASTER | NTF_SELF) 3047 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES (NUD_PERMANENT | NUD_NOARP) 3048 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS (NTF_EXT_LEARNED | NTF_OFFLOADED | \ 3049 NTF_ROUTER) 3050 3051 static int vxlan_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev, 3052 struct netlink_ext_ack *extack) 3053 { 3054 struct vxlan_dev *vxlan = netdev_priv(dev); 3055 struct vxlan_fdb_flush_desc desc = {}; 3056 struct ndmsg *ndm = nlmsg_data(nlh); 3057 struct nlattr *tb[NDA_MAX + 1]; 3058 u8 ndm_flags; 3059 int err; 3060 3061 ndm_flags = ndm->ndm_flags & ~VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS; 3062 3063 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, vxlan_del_bulk_policy, 3064 extack); 3065 if (err) 3066 return err; 3067 3068 if (ndm_flags & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS) { 3069 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set"); 3070 return -EINVAL; 3071 } 3072 if (ndm->ndm_state & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES) { 3073 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set"); 3074 return -EINVAL; 3075 } 3076 3077 desc.state = ndm->ndm_state; 3078 desc.flags = ndm_flags; 3079 3080 if (tb[NDA_NDM_STATE_MASK]) 3081 desc.state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]); 3082 3083 if (tb[NDA_NDM_FLAGS_MASK]) 3084 desc.flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]); 3085 3086 if (tb[NDA_SRC_VNI]) 3087 desc.src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 3088 3089 if (tb[NDA_NH_ID]) 3090 desc.nhid = nla_get_u32(tb[NDA_NH_ID]); 3091 3092 if (tb[NDA_VNI]) 3093 desc.vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 3094 3095 if (tb[NDA_PORT]) 3096 desc.port = nla_get_be16(tb[NDA_PORT]); 3097 3098 if (tb[NDA_DST]) { 3099 union vxlan_addr ip; 3100 3101 err = vxlan_nla_get_addr(&ip, tb[NDA_DST]); 3102 if (err) { 3103 NL_SET_ERR_MSG_ATTR(extack, tb[NDA_DST], 3104 "Unsupported address family"); 3105 return err; 3106 } 3107 desc.dst_ip = ip; 3108 } 3109 3110 vxlan_flush(vxlan, &desc); 3111 3112 return 0; 3113 } 3114 3115 /* Cleanup timer and forwarding table on shutdown */ 3116 static int vxlan_stop(struct net_device *dev) 3117 { 3118 struct vxlan_dev *vxlan = netdev_priv(dev); 3119 struct vxlan_fdb_flush_desc desc = { 3120 /* Default entry is deleted at vxlan_uninit. */ 3121 .ignore_default_entry = true, 3122 .state = 0, 3123 .state_mask = NUD_PERMANENT | NUD_NOARP, 3124 }; 3125 3126 vxlan_multicast_leave(vxlan); 3127 3128 del_timer_sync(&vxlan->age_timer); 3129 3130 vxlan_flush(vxlan, &desc); 3131 vxlan_sock_release(vxlan); 3132 3133 return 0; 3134 } 3135 3136 /* Stub, nothing needs to be done. */ 3137 static void vxlan_set_multicast_list(struct net_device *dev) 3138 { 3139 } 3140 3141 static int vxlan_change_mtu(struct net_device *dev, int new_mtu) 3142 { 3143 struct vxlan_dev *vxlan = netdev_priv(dev); 3144 struct vxlan_rdst *dst = &vxlan->default_dst; 3145 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3146 dst->remote_ifindex); 3147 3148 /* This check is different than dev->max_mtu, because it looks at 3149 * the lowerdev->mtu, rather than the static dev->max_mtu 3150 */ 3151 if (lowerdev) { 3152 int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags); 3153 if (new_mtu > max_mtu) 3154 return -EINVAL; 3155 } 3156 3157 dev->mtu = new_mtu; 3158 return 0; 3159 } 3160 3161 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 3162 { 3163 struct vxlan_dev *vxlan = netdev_priv(dev); 3164 struct ip_tunnel_info *info = skb_tunnel_info(skb); 3165 __be16 sport, dport; 3166 3167 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 3168 vxlan->cfg.port_max, true); 3169 dport = info->key.tp_dst ? : vxlan->cfg.dst_port; 3170 3171 if (ip_tunnel_info_af(info) == AF_INET) { 3172 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 3173 struct rtable *rt; 3174 3175 if (!sock4) 3176 return -EIO; 3177 3178 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, 0, 3179 &info->key.u.ipv4.src, 3180 &info->key, 3181 sport, dport, info->key.tos, 3182 &info->dst_cache); 3183 if (IS_ERR(rt)) 3184 return PTR_ERR(rt); 3185 ip_rt_put(rt); 3186 } else { 3187 #if IS_ENABLED(CONFIG_IPV6) 3188 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 3189 struct dst_entry *ndst; 3190 3191 if (!sock6) 3192 return -EIO; 3193 3194 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sock, 3195 0, &info->key.u.ipv6.src, 3196 &info->key, 3197 sport, dport, info->key.tos, 3198 &info->dst_cache); 3199 if (IS_ERR(ndst)) 3200 return PTR_ERR(ndst); 3201 dst_release(ndst); 3202 #else /* !CONFIG_IPV6 */ 3203 return -EPFNOSUPPORT; 3204 #endif 3205 } 3206 info->key.tp_src = sport; 3207 info->key.tp_dst = dport; 3208 return 0; 3209 } 3210 3211 static const struct net_device_ops vxlan_netdev_ether_ops = { 3212 .ndo_init = vxlan_init, 3213 .ndo_uninit = vxlan_uninit, 3214 .ndo_open = vxlan_open, 3215 .ndo_stop = vxlan_stop, 3216 .ndo_start_xmit = vxlan_xmit, 3217 .ndo_set_rx_mode = vxlan_set_multicast_list, 3218 .ndo_change_mtu = vxlan_change_mtu, 3219 .ndo_validate_addr = eth_validate_addr, 3220 .ndo_set_mac_address = eth_mac_addr, 3221 .ndo_fdb_add = vxlan_fdb_add, 3222 .ndo_fdb_del = vxlan_fdb_delete, 3223 .ndo_fdb_del_bulk = vxlan_fdb_delete_bulk, 3224 .ndo_fdb_dump = vxlan_fdb_dump, 3225 .ndo_fdb_get = vxlan_fdb_get, 3226 .ndo_mdb_add = vxlan_mdb_add, 3227 .ndo_mdb_del = vxlan_mdb_del, 3228 .ndo_mdb_del_bulk = vxlan_mdb_del_bulk, 3229 .ndo_mdb_dump = vxlan_mdb_dump, 3230 .ndo_mdb_get = vxlan_mdb_get, 3231 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3232 }; 3233 3234 static const struct net_device_ops vxlan_netdev_raw_ops = { 3235 .ndo_init = vxlan_init, 3236 .ndo_uninit = vxlan_uninit, 3237 .ndo_open = vxlan_open, 3238 .ndo_stop = vxlan_stop, 3239 .ndo_start_xmit = vxlan_xmit, 3240 .ndo_change_mtu = vxlan_change_mtu, 3241 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3242 }; 3243 3244 /* Info for udev, that this is a virtual tunnel endpoint */ 3245 static const struct device_type vxlan_type = { 3246 .name = "vxlan", 3247 }; 3248 3249 /* Calls the ndo_udp_tunnel_add of the caller in order to 3250 * supply the listening VXLAN udp ports. Callers are expected 3251 * to implement the ndo_udp_tunnel_add. 3252 */ 3253 static void vxlan_offload_rx_ports(struct net_device *dev, bool push) 3254 { 3255 struct vxlan_sock *vs; 3256 struct net *net = dev_net(dev); 3257 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3258 unsigned int i; 3259 3260 spin_lock(&vn->sock_lock); 3261 for (i = 0; i < PORT_HASH_SIZE; ++i) { 3262 hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) { 3263 unsigned short type; 3264 3265 if (vs->flags & VXLAN_F_GPE) 3266 type = UDP_TUNNEL_TYPE_VXLAN_GPE; 3267 else 3268 type = UDP_TUNNEL_TYPE_VXLAN; 3269 3270 if (push) 3271 udp_tunnel_push_rx_port(dev, vs->sock, type); 3272 else 3273 udp_tunnel_drop_rx_port(dev, vs->sock, type); 3274 } 3275 } 3276 spin_unlock(&vn->sock_lock); 3277 } 3278 3279 /* Initialize the device structure. */ 3280 static void vxlan_setup(struct net_device *dev) 3281 { 3282 struct vxlan_dev *vxlan = netdev_priv(dev); 3283 unsigned int h; 3284 3285 eth_hw_addr_random(dev); 3286 ether_setup(dev); 3287 3288 dev->needs_free_netdev = true; 3289 SET_NETDEV_DEVTYPE(dev, &vxlan_type); 3290 3291 dev->features |= NETIF_F_LLTX; 3292 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3293 dev->features |= NETIF_F_RXCSUM; 3294 dev->features |= NETIF_F_GSO_SOFTWARE; 3295 3296 dev->vlan_features = dev->features; 3297 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3298 dev->hw_features |= NETIF_F_RXCSUM; 3299 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3300 netif_keep_dst(dev); 3301 dev->priv_flags |= IFF_NO_QUEUE | IFF_CHANGE_PROTO_DOWN; 3302 3303 /* MTU range: 68 - 65535 */ 3304 dev->min_mtu = ETH_MIN_MTU; 3305 dev->max_mtu = ETH_MAX_MTU; 3306 3307 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 3308 INIT_LIST_HEAD(&vxlan->next); 3309 3310 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE); 3311 3312 vxlan->dev = dev; 3313 3314 for (h = 0; h < FDB_HASH_SIZE; ++h) { 3315 spin_lock_init(&vxlan->hash_lock[h]); 3316 INIT_HLIST_HEAD(&vxlan->fdb_head[h]); 3317 } 3318 } 3319 3320 static void vxlan_ether_setup(struct net_device *dev) 3321 { 3322 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 3323 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 3324 dev->netdev_ops = &vxlan_netdev_ether_ops; 3325 } 3326 3327 static void vxlan_raw_setup(struct net_device *dev) 3328 { 3329 dev->header_ops = NULL; 3330 dev->type = ARPHRD_NONE; 3331 dev->hard_header_len = 0; 3332 dev->addr_len = 0; 3333 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 3334 dev->netdev_ops = &vxlan_netdev_raw_ops; 3335 } 3336 3337 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { 3338 [IFLA_VXLAN_UNSPEC] = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS }, 3339 [IFLA_VXLAN_ID] = { .type = NLA_U32 }, 3340 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) }, 3341 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, 3342 [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, 3343 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 3344 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, 3345 [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, 3346 [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, 3347 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 }, 3348 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, 3349 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, 3350 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, 3351 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, 3352 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, 3353 [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, 3354 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, 3355 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, 3356 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 }, 3357 [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, 3358 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 }, 3359 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 3360 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 3361 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 }, 3362 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 }, 3363 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, }, 3364 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, }, 3365 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG }, 3366 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG }, 3367 [IFLA_VXLAN_DF] = { .type = NLA_U8 }, 3368 [IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 }, 3369 [IFLA_VXLAN_LOCALBYPASS] = NLA_POLICY_MAX(NLA_U8, 1), 3370 [IFLA_VXLAN_LABEL_POLICY] = NLA_POLICY_MAX(NLA_U32, VXLAN_LABEL_MAX), 3371 }; 3372 3373 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[], 3374 struct netlink_ext_ack *extack) 3375 { 3376 if (tb[IFLA_ADDRESS]) { 3377 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 3378 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3379 "Provided link layer address is not Ethernet"); 3380 return -EINVAL; 3381 } 3382 3383 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 3384 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3385 "Provided Ethernet address is not unicast"); 3386 return -EADDRNOTAVAIL; 3387 } 3388 } 3389 3390 if (tb[IFLA_MTU]) { 3391 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3392 3393 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) { 3394 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 3395 "MTU must be between 68 and 65535"); 3396 return -EINVAL; 3397 } 3398 } 3399 3400 if (!data) { 3401 NL_SET_ERR_MSG(extack, 3402 "Required attributes not provided to perform the operation"); 3403 return -EINVAL; 3404 } 3405 3406 if (data[IFLA_VXLAN_ID]) { 3407 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); 3408 3409 if (id >= VXLAN_N_VID) { 3410 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID], 3411 "VXLAN ID must be lower than 16777216"); 3412 return -ERANGE; 3413 } 3414 } 3415 3416 if (data[IFLA_VXLAN_PORT_RANGE]) { 3417 const struct ifla_vxlan_port_range *p 3418 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 3419 3420 if (ntohs(p->high) < ntohs(p->low)) { 3421 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE], 3422 "Invalid source port range"); 3423 return -EINVAL; 3424 } 3425 } 3426 3427 if (data[IFLA_VXLAN_DF]) { 3428 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]); 3429 3430 if (df < 0 || df > VXLAN_DF_MAX) { 3431 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF], 3432 "Invalid DF attribute"); 3433 return -EINVAL; 3434 } 3435 } 3436 3437 return 0; 3438 } 3439 3440 static void vxlan_get_drvinfo(struct net_device *netdev, 3441 struct ethtool_drvinfo *drvinfo) 3442 { 3443 strscpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); 3444 strscpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); 3445 } 3446 3447 static int vxlan_get_link_ksettings(struct net_device *dev, 3448 struct ethtool_link_ksettings *cmd) 3449 { 3450 struct vxlan_dev *vxlan = netdev_priv(dev); 3451 struct vxlan_rdst *dst = &vxlan->default_dst; 3452 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3453 dst->remote_ifindex); 3454 3455 if (!lowerdev) { 3456 cmd->base.duplex = DUPLEX_UNKNOWN; 3457 cmd->base.port = PORT_OTHER; 3458 cmd->base.speed = SPEED_UNKNOWN; 3459 3460 return 0; 3461 } 3462 3463 return __ethtool_get_link_ksettings(lowerdev, cmd); 3464 } 3465 3466 static const struct ethtool_ops vxlan_ethtool_ops = { 3467 .get_drvinfo = vxlan_get_drvinfo, 3468 .get_link = ethtool_op_get_link, 3469 .get_link_ksettings = vxlan_get_link_ksettings, 3470 }; 3471 3472 static struct socket *vxlan_create_sock(struct net *net, bool ipv6, 3473 __be16 port, u32 flags, int ifindex) 3474 { 3475 struct socket *sock; 3476 struct udp_port_cfg udp_conf; 3477 int err; 3478 3479 memset(&udp_conf, 0, sizeof(udp_conf)); 3480 3481 if (ipv6) { 3482 udp_conf.family = AF_INET6; 3483 udp_conf.use_udp6_rx_checksums = 3484 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX); 3485 udp_conf.ipv6_v6only = 1; 3486 } else { 3487 udp_conf.family = AF_INET; 3488 } 3489 3490 udp_conf.local_udp_port = port; 3491 udp_conf.bind_ifindex = ifindex; 3492 3493 /* Open UDP socket */ 3494 err = udp_sock_create(net, &udp_conf, &sock); 3495 if (err < 0) 3496 return ERR_PTR(err); 3497 3498 udp_allow_gso(sock->sk); 3499 return sock; 3500 } 3501 3502 /* Create new listen socket if needed */ 3503 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, 3504 __be16 port, u32 flags, 3505 int ifindex) 3506 { 3507 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3508 struct vxlan_sock *vs; 3509 struct socket *sock; 3510 unsigned int h; 3511 struct udp_tunnel_sock_cfg tunnel_cfg; 3512 3513 vs = kzalloc(sizeof(*vs), GFP_KERNEL); 3514 if (!vs) 3515 return ERR_PTR(-ENOMEM); 3516 3517 for (h = 0; h < VNI_HASH_SIZE; ++h) 3518 INIT_HLIST_HEAD(&vs->vni_list[h]); 3519 3520 sock = vxlan_create_sock(net, ipv6, port, flags, ifindex); 3521 if (IS_ERR(sock)) { 3522 kfree(vs); 3523 return ERR_CAST(sock); 3524 } 3525 3526 vs->sock = sock; 3527 refcount_set(&vs->refcnt, 1); 3528 vs->flags = (flags & VXLAN_F_RCV_FLAGS); 3529 3530 spin_lock(&vn->sock_lock); 3531 hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); 3532 udp_tunnel_notify_add_rx_port(sock, 3533 (vs->flags & VXLAN_F_GPE) ? 3534 UDP_TUNNEL_TYPE_VXLAN_GPE : 3535 UDP_TUNNEL_TYPE_VXLAN); 3536 spin_unlock(&vn->sock_lock); 3537 3538 /* Mark socket as an encapsulation socket. */ 3539 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 3540 tunnel_cfg.sk_user_data = vs; 3541 tunnel_cfg.encap_type = 1; 3542 tunnel_cfg.encap_rcv = vxlan_rcv; 3543 tunnel_cfg.encap_err_lookup = vxlan_err_lookup; 3544 tunnel_cfg.encap_destroy = NULL; 3545 if (vs->flags & VXLAN_F_GPE) { 3546 tunnel_cfg.gro_receive = vxlan_gpe_gro_receive; 3547 tunnel_cfg.gro_complete = vxlan_gpe_gro_complete; 3548 } else { 3549 tunnel_cfg.gro_receive = vxlan_gro_receive; 3550 tunnel_cfg.gro_complete = vxlan_gro_complete; 3551 } 3552 3553 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 3554 3555 return vs; 3556 } 3557 3558 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) 3559 { 3560 struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id); 3561 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3562 struct vxlan_sock *vs = NULL; 3563 struct vxlan_dev_node *node; 3564 int l3mdev_index = 0; 3565 3566 if (vxlan->cfg.remote_ifindex) 3567 l3mdev_index = l3mdev_master_upper_ifindex_by_index( 3568 vxlan->net, vxlan->cfg.remote_ifindex); 3569 3570 if (!vxlan->cfg.no_share) { 3571 spin_lock(&vn->sock_lock); 3572 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, 3573 vxlan->cfg.dst_port, vxlan->cfg.flags, 3574 l3mdev_index); 3575 if (vs && !refcount_inc_not_zero(&vs->refcnt)) { 3576 spin_unlock(&vn->sock_lock); 3577 return -EBUSY; 3578 } 3579 spin_unlock(&vn->sock_lock); 3580 } 3581 if (!vs) 3582 vs = vxlan_socket_create(vxlan->net, ipv6, 3583 vxlan->cfg.dst_port, vxlan->cfg.flags, 3584 l3mdev_index); 3585 if (IS_ERR(vs)) 3586 return PTR_ERR(vs); 3587 #if IS_ENABLED(CONFIG_IPV6) 3588 if (ipv6) { 3589 rcu_assign_pointer(vxlan->vn6_sock, vs); 3590 node = &vxlan->hlist6; 3591 } else 3592 #endif 3593 { 3594 rcu_assign_pointer(vxlan->vn4_sock, vs); 3595 node = &vxlan->hlist4; 3596 } 3597 3598 if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER)) 3599 vxlan_vs_add_vnigrp(vxlan, vs, ipv6); 3600 else 3601 vxlan_vs_add_dev(vs, vxlan, node); 3602 3603 return 0; 3604 } 3605 3606 static int vxlan_sock_add(struct vxlan_dev *vxlan) 3607 { 3608 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3609 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata; 3610 bool ipv4 = !ipv6 || metadata; 3611 int ret = 0; 3612 3613 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 3614 #if IS_ENABLED(CONFIG_IPV6) 3615 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 3616 if (ipv6) { 3617 ret = __vxlan_sock_add(vxlan, true); 3618 if (ret < 0 && ret != -EAFNOSUPPORT) 3619 ipv4 = false; 3620 } 3621 #endif 3622 if (ipv4) 3623 ret = __vxlan_sock_add(vxlan, false); 3624 if (ret < 0) 3625 vxlan_sock_release(vxlan); 3626 return ret; 3627 } 3628 3629 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, 3630 struct vxlan_config *conf, __be32 vni) 3631 { 3632 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id); 3633 struct vxlan_dev *tmp; 3634 3635 list_for_each_entry(tmp, &vn->vxlan_list, next) { 3636 if (tmp == vxlan) 3637 continue; 3638 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) { 3639 if (!vxlan_vnifilter_lookup(tmp, vni)) 3640 continue; 3641 } else if (tmp->cfg.vni != vni) { 3642 continue; 3643 } 3644 if (tmp->cfg.dst_port != conf->dst_port) 3645 continue; 3646 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) != 3647 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6))) 3648 continue; 3649 3650 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) && 3651 tmp->cfg.remote_ifindex != conf->remote_ifindex) 3652 continue; 3653 3654 return -EEXIST; 3655 } 3656 3657 return 0; 3658 } 3659 3660 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, 3661 struct net_device **lower, 3662 struct vxlan_dev *old, 3663 struct netlink_ext_ack *extack) 3664 { 3665 bool use_ipv6 = false; 3666 3667 if (conf->flags & VXLAN_F_GPE) { 3668 /* For now, allow GPE only together with 3669 * COLLECT_METADATA. This can be relaxed later; in such 3670 * case, the other side of the PtP link will have to be 3671 * provided. 3672 */ 3673 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) || 3674 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3675 NL_SET_ERR_MSG(extack, 3676 "VXLAN GPE does not support this combination of attributes"); 3677 return -EINVAL; 3678 } 3679 } 3680 3681 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) { 3682 /* Unless IPv6 is explicitly requested, assume IPv4 */ 3683 conf->remote_ip.sa.sa_family = AF_INET; 3684 conf->saddr.sa.sa_family = AF_INET; 3685 } else if (!conf->remote_ip.sa.sa_family) { 3686 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family; 3687 } else if (!conf->saddr.sa.sa_family) { 3688 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family; 3689 } 3690 3691 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) { 3692 NL_SET_ERR_MSG(extack, 3693 "Local and remote address must be from the same family"); 3694 return -EINVAL; 3695 } 3696 3697 if (vxlan_addr_multicast(&conf->saddr)) { 3698 NL_SET_ERR_MSG(extack, "Local address cannot be multicast"); 3699 return -EINVAL; 3700 } 3701 3702 if (conf->saddr.sa.sa_family == AF_INET6) { 3703 if (!IS_ENABLED(CONFIG_IPV6)) { 3704 NL_SET_ERR_MSG(extack, 3705 "IPv6 support not enabled in the kernel"); 3706 return -EPFNOSUPPORT; 3707 } 3708 use_ipv6 = true; 3709 conf->flags |= VXLAN_F_IPV6; 3710 3711 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3712 int local_type = 3713 ipv6_addr_type(&conf->saddr.sin6.sin6_addr); 3714 int remote_type = 3715 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr); 3716 3717 if (local_type & IPV6_ADDR_LINKLOCAL) { 3718 if (!(remote_type & IPV6_ADDR_LINKLOCAL) && 3719 (remote_type != IPV6_ADDR_ANY)) { 3720 NL_SET_ERR_MSG(extack, 3721 "Invalid combination of local and remote address scopes"); 3722 return -EINVAL; 3723 } 3724 3725 conf->flags |= VXLAN_F_IPV6_LINKLOCAL; 3726 } else { 3727 if (remote_type == 3728 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) { 3729 NL_SET_ERR_MSG(extack, 3730 "Invalid combination of local and remote address scopes"); 3731 return -EINVAL; 3732 } 3733 3734 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL; 3735 } 3736 } 3737 } 3738 3739 if (conf->label && !use_ipv6) { 3740 NL_SET_ERR_MSG(extack, 3741 "Label attribute only applies to IPv6 VXLAN devices"); 3742 return -EINVAL; 3743 } 3744 3745 if (conf->label_policy && !use_ipv6) { 3746 NL_SET_ERR_MSG(extack, 3747 "Label policy only applies to IPv6 VXLAN devices"); 3748 return -EINVAL; 3749 } 3750 3751 if (conf->remote_ifindex) { 3752 struct net_device *lowerdev; 3753 3754 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex); 3755 if (!lowerdev) { 3756 NL_SET_ERR_MSG(extack, 3757 "Invalid local interface, device not found"); 3758 return -ENODEV; 3759 } 3760 3761 #if IS_ENABLED(CONFIG_IPV6) 3762 if (use_ipv6) { 3763 struct inet6_dev *idev = __in6_dev_get(lowerdev); 3764 3765 if (idev && idev->cnf.disable_ipv6) { 3766 NL_SET_ERR_MSG(extack, 3767 "IPv6 support disabled by administrator"); 3768 return -EPERM; 3769 } 3770 } 3771 #endif 3772 3773 *lower = lowerdev; 3774 } else { 3775 if (vxlan_addr_multicast(&conf->remote_ip)) { 3776 NL_SET_ERR_MSG(extack, 3777 "Local interface required for multicast remote destination"); 3778 3779 return -EINVAL; 3780 } 3781 3782 #if IS_ENABLED(CONFIG_IPV6) 3783 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) { 3784 NL_SET_ERR_MSG(extack, 3785 "Local interface required for link-local local/remote addresses"); 3786 return -EINVAL; 3787 } 3788 #endif 3789 3790 *lower = NULL; 3791 } 3792 3793 if (!conf->dst_port) { 3794 if (conf->flags & VXLAN_F_GPE) 3795 conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT); 3796 else 3797 conf->dst_port = htons(vxlan_port); 3798 } 3799 3800 if (!conf->age_interval) 3801 conf->age_interval = FDB_AGE_DEFAULT; 3802 3803 if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) { 3804 NL_SET_ERR_MSG(extack, 3805 "A VXLAN device with the specified VNI already exists"); 3806 return -EEXIST; 3807 } 3808 3809 return 0; 3810 } 3811 3812 static void vxlan_config_apply(struct net_device *dev, 3813 struct vxlan_config *conf, 3814 struct net_device *lowerdev, 3815 struct net *src_net, 3816 bool changelink) 3817 { 3818 struct vxlan_dev *vxlan = netdev_priv(dev); 3819 struct vxlan_rdst *dst = &vxlan->default_dst; 3820 unsigned short needed_headroom = ETH_HLEN; 3821 int max_mtu = ETH_MAX_MTU; 3822 u32 flags = conf->flags; 3823 3824 if (!changelink) { 3825 if (flags & VXLAN_F_GPE) 3826 vxlan_raw_setup(dev); 3827 else 3828 vxlan_ether_setup(dev); 3829 3830 if (conf->mtu) 3831 dev->mtu = conf->mtu; 3832 3833 vxlan->net = src_net; 3834 } 3835 3836 dst->remote_vni = conf->vni; 3837 3838 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip)); 3839 3840 if (lowerdev) { 3841 dst->remote_ifindex = conf->remote_ifindex; 3842 3843 netif_inherit_tso_max(dev, lowerdev); 3844 3845 needed_headroom = lowerdev->hard_header_len; 3846 needed_headroom += lowerdev->needed_headroom; 3847 3848 dev->needed_tailroom = lowerdev->needed_tailroom; 3849 3850 max_mtu = lowerdev->mtu - vxlan_headroom(flags); 3851 if (max_mtu < ETH_MIN_MTU) 3852 max_mtu = ETH_MIN_MTU; 3853 3854 if (!changelink && !conf->mtu) 3855 dev->mtu = max_mtu; 3856 } 3857 3858 if (dev->mtu > max_mtu) 3859 dev->mtu = max_mtu; 3860 3861 if (flags & VXLAN_F_COLLECT_METADATA) 3862 flags |= VXLAN_F_IPV6; 3863 needed_headroom += vxlan_headroom(flags); 3864 dev->needed_headroom = needed_headroom; 3865 3866 memcpy(&vxlan->cfg, conf, sizeof(*conf)); 3867 } 3868 3869 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, 3870 struct vxlan_config *conf, bool changelink, 3871 struct netlink_ext_ack *extack) 3872 { 3873 struct vxlan_dev *vxlan = netdev_priv(dev); 3874 struct net_device *lowerdev; 3875 int ret; 3876 3877 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack); 3878 if (ret) 3879 return ret; 3880 3881 vxlan_config_apply(dev, conf, lowerdev, src_net, changelink); 3882 3883 return 0; 3884 } 3885 3886 static int __vxlan_dev_create(struct net *net, struct net_device *dev, 3887 struct vxlan_config *conf, 3888 struct netlink_ext_ack *extack) 3889 { 3890 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3891 struct vxlan_dev *vxlan = netdev_priv(dev); 3892 struct net_device *remote_dev = NULL; 3893 struct vxlan_fdb *f = NULL; 3894 bool unregister = false; 3895 struct vxlan_rdst *dst; 3896 int err; 3897 3898 dst = &vxlan->default_dst; 3899 err = vxlan_dev_configure(net, dev, conf, false, extack); 3900 if (err) 3901 return err; 3902 3903 dev->ethtool_ops = &vxlan_ethtool_ops; 3904 3905 /* create an fdb entry for a valid default destination */ 3906 if (!vxlan_addr_any(&dst->remote_ip)) { 3907 err = vxlan_fdb_create(vxlan, all_zeros_mac, 3908 &dst->remote_ip, 3909 NUD_REACHABLE | NUD_PERMANENT, 3910 vxlan->cfg.dst_port, 3911 dst->remote_vni, 3912 dst->remote_vni, 3913 dst->remote_ifindex, 3914 NTF_SELF, 0, &f, extack); 3915 if (err) 3916 return err; 3917 } 3918 3919 err = register_netdevice(dev); 3920 if (err) 3921 goto errout; 3922 unregister = true; 3923 3924 if (dst->remote_ifindex) { 3925 remote_dev = __dev_get_by_index(net, dst->remote_ifindex); 3926 if (!remote_dev) { 3927 err = -ENODEV; 3928 goto errout; 3929 } 3930 3931 err = netdev_upper_dev_link(remote_dev, dev, extack); 3932 if (err) 3933 goto errout; 3934 } 3935 3936 err = rtnl_configure_link(dev, NULL, 0, NULL); 3937 if (err < 0) 3938 goto unlink; 3939 3940 if (f) { 3941 vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f); 3942 3943 /* notify default fdb entry */ 3944 err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), 3945 RTM_NEWNEIGH, true, extack); 3946 if (err) { 3947 vxlan_fdb_destroy(vxlan, f, false, false); 3948 if (remote_dev) 3949 netdev_upper_dev_unlink(remote_dev, dev); 3950 goto unregister; 3951 } 3952 } 3953 3954 list_add(&vxlan->next, &vn->vxlan_list); 3955 if (remote_dev) 3956 dst->remote_dev = remote_dev; 3957 return 0; 3958 unlink: 3959 if (remote_dev) 3960 netdev_upper_dev_unlink(remote_dev, dev); 3961 errout: 3962 /* unregister_netdevice() destroys the default FDB entry with deletion 3963 * notification. But the addition notification was not sent yet, so 3964 * destroy the entry by hand here. 3965 */ 3966 if (f) 3967 __vxlan_fdb_free(f); 3968 unregister: 3969 if (unregister) 3970 unregister_netdevice(dev); 3971 return err; 3972 } 3973 3974 /* Set/clear flags based on attribute */ 3975 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[], 3976 int attrtype, unsigned long mask, bool changelink, 3977 bool changelink_supported, 3978 struct netlink_ext_ack *extack) 3979 { 3980 unsigned long flags; 3981 3982 if (!tb[attrtype]) 3983 return 0; 3984 3985 if (changelink && !changelink_supported) { 3986 vxlan_flag_attr_error(attrtype, extack); 3987 return -EOPNOTSUPP; 3988 } 3989 3990 if (vxlan_policy[attrtype].type == NLA_FLAG) 3991 flags = conf->flags | mask; 3992 else if (nla_get_u8(tb[attrtype])) 3993 flags = conf->flags | mask; 3994 else 3995 flags = conf->flags & ~mask; 3996 3997 conf->flags = flags; 3998 3999 return 0; 4000 } 4001 4002 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], 4003 struct net_device *dev, struct vxlan_config *conf, 4004 bool changelink, struct netlink_ext_ack *extack) 4005 { 4006 struct vxlan_dev *vxlan = netdev_priv(dev); 4007 int err = 0; 4008 4009 memset(conf, 0, sizeof(*conf)); 4010 4011 /* if changelink operation, start with old existing cfg */ 4012 if (changelink) 4013 memcpy(conf, &vxlan->cfg, sizeof(*conf)); 4014 4015 if (data[IFLA_VXLAN_ID]) { 4016 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4017 4018 if (changelink && (vni != conf->vni)) { 4019 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI"); 4020 return -EOPNOTSUPP; 4021 } 4022 conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4023 } 4024 4025 if (data[IFLA_VXLAN_GROUP]) { 4026 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) { 4027 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group"); 4028 return -EOPNOTSUPP; 4029 } 4030 4031 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]); 4032 conf->remote_ip.sa.sa_family = AF_INET; 4033 } else if (data[IFLA_VXLAN_GROUP6]) { 4034 if (!IS_ENABLED(CONFIG_IPV6)) { 4035 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel"); 4036 return -EPFNOSUPPORT; 4037 } 4038 4039 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) { 4040 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group"); 4041 return -EOPNOTSUPP; 4042 } 4043 4044 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]); 4045 conf->remote_ip.sa.sa_family = AF_INET6; 4046 } 4047 4048 if (data[IFLA_VXLAN_LOCAL]) { 4049 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) { 4050 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old"); 4051 return -EOPNOTSUPP; 4052 } 4053 4054 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]); 4055 conf->saddr.sa.sa_family = AF_INET; 4056 } else if (data[IFLA_VXLAN_LOCAL6]) { 4057 if (!IS_ENABLED(CONFIG_IPV6)) { 4058 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel"); 4059 return -EPFNOSUPPORT; 4060 } 4061 4062 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) { 4063 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old"); 4064 return -EOPNOTSUPP; 4065 } 4066 4067 /* TODO: respect scope id */ 4068 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]); 4069 conf->saddr.sa.sa_family = AF_INET6; 4070 } 4071 4072 if (data[IFLA_VXLAN_LINK]) 4073 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]); 4074 4075 if (data[IFLA_VXLAN_TOS]) 4076 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); 4077 4078 if (data[IFLA_VXLAN_TTL]) 4079 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); 4080 4081 if (data[IFLA_VXLAN_TTL_INHERIT]) { 4082 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT, 4083 VXLAN_F_TTL_INHERIT, changelink, false, 4084 extack); 4085 if (err) 4086 return err; 4087 4088 } 4089 4090 if (data[IFLA_VXLAN_LABEL]) 4091 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) & 4092 IPV6_FLOWLABEL_MASK; 4093 if (data[IFLA_VXLAN_LABEL_POLICY]) 4094 conf->label_policy = nla_get_u32(data[IFLA_VXLAN_LABEL_POLICY]); 4095 4096 if (data[IFLA_VXLAN_LEARNING]) { 4097 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING, 4098 VXLAN_F_LEARN, changelink, true, 4099 extack); 4100 if (err) 4101 return err; 4102 } else if (!changelink) { 4103 /* default to learn on a new device */ 4104 conf->flags |= VXLAN_F_LEARN; 4105 } 4106 4107 if (data[IFLA_VXLAN_AGEING]) 4108 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); 4109 4110 if (data[IFLA_VXLAN_PROXY]) { 4111 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY, 4112 VXLAN_F_PROXY, changelink, false, 4113 extack); 4114 if (err) 4115 return err; 4116 } 4117 4118 if (data[IFLA_VXLAN_RSC]) { 4119 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC, 4120 VXLAN_F_RSC, changelink, false, 4121 extack); 4122 if (err) 4123 return err; 4124 } 4125 4126 if (data[IFLA_VXLAN_L2MISS]) { 4127 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS, 4128 VXLAN_F_L2MISS, changelink, false, 4129 extack); 4130 if (err) 4131 return err; 4132 } 4133 4134 if (data[IFLA_VXLAN_L3MISS]) { 4135 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS, 4136 VXLAN_F_L3MISS, changelink, false, 4137 extack); 4138 if (err) 4139 return err; 4140 } 4141 4142 if (data[IFLA_VXLAN_LIMIT]) { 4143 if (changelink) { 4144 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT], 4145 "Cannot change limit"); 4146 return -EOPNOTSUPP; 4147 } 4148 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); 4149 } 4150 4151 if (data[IFLA_VXLAN_COLLECT_METADATA]) { 4152 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA, 4153 VXLAN_F_COLLECT_METADATA, changelink, false, 4154 extack); 4155 if (err) 4156 return err; 4157 } 4158 4159 if (data[IFLA_VXLAN_PORT_RANGE]) { 4160 if (!changelink) { 4161 const struct ifla_vxlan_port_range *p 4162 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 4163 conf->port_min = ntohs(p->low); 4164 conf->port_max = ntohs(p->high); 4165 } else { 4166 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], 4167 "Cannot change port range"); 4168 return -EOPNOTSUPP; 4169 } 4170 } 4171 4172 if (data[IFLA_VXLAN_PORT]) { 4173 if (changelink) { 4174 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT], 4175 "Cannot change port"); 4176 return -EOPNOTSUPP; 4177 } 4178 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); 4179 } 4180 4181 if (data[IFLA_VXLAN_UDP_CSUM]) { 4182 if (changelink) { 4183 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM], 4184 "Cannot change UDP_CSUM flag"); 4185 return -EOPNOTSUPP; 4186 } 4187 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM])) 4188 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX; 4189 } 4190 4191 if (data[IFLA_VXLAN_LOCALBYPASS]) { 4192 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS, 4193 VXLAN_F_LOCALBYPASS, changelink, 4194 true, extack); 4195 if (err) 4196 return err; 4197 } else if (!changelink) { 4198 /* default to local bypass on a new device */ 4199 conf->flags |= VXLAN_F_LOCALBYPASS; 4200 } 4201 4202 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) { 4203 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4204 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink, 4205 false, extack); 4206 if (err) 4207 return err; 4208 } 4209 4210 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) { 4211 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4212 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink, 4213 false, extack); 4214 if (err) 4215 return err; 4216 } 4217 4218 if (data[IFLA_VXLAN_REMCSUM_TX]) { 4219 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX, 4220 VXLAN_F_REMCSUM_TX, changelink, false, 4221 extack); 4222 if (err) 4223 return err; 4224 } 4225 4226 if (data[IFLA_VXLAN_REMCSUM_RX]) { 4227 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX, 4228 VXLAN_F_REMCSUM_RX, changelink, false, 4229 extack); 4230 if (err) 4231 return err; 4232 } 4233 4234 if (data[IFLA_VXLAN_GBP]) { 4235 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP, 4236 VXLAN_F_GBP, changelink, false, extack); 4237 if (err) 4238 return err; 4239 } 4240 4241 if (data[IFLA_VXLAN_GPE]) { 4242 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE, 4243 VXLAN_F_GPE, changelink, false, 4244 extack); 4245 if (err) 4246 return err; 4247 } 4248 4249 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) { 4250 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL, 4251 VXLAN_F_REMCSUM_NOPARTIAL, changelink, 4252 false, extack); 4253 if (err) 4254 return err; 4255 } 4256 4257 if (tb[IFLA_MTU]) { 4258 if (changelink) { 4259 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 4260 "Cannot change mtu"); 4261 return -EOPNOTSUPP; 4262 } 4263 conf->mtu = nla_get_u32(tb[IFLA_MTU]); 4264 } 4265 4266 if (data[IFLA_VXLAN_DF]) 4267 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]); 4268 4269 if (data[IFLA_VXLAN_VNIFILTER]) { 4270 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER, 4271 VXLAN_F_VNIFILTER, changelink, false, 4272 extack); 4273 if (err) 4274 return err; 4275 4276 if ((conf->flags & VXLAN_F_VNIFILTER) && 4277 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 4278 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER], 4279 "vxlan vnifilter only valid in collect metadata mode"); 4280 return -EINVAL; 4281 } 4282 } 4283 4284 return 0; 4285 } 4286 4287 static int vxlan_newlink(struct net *src_net, struct net_device *dev, 4288 struct nlattr *tb[], struct nlattr *data[], 4289 struct netlink_ext_ack *extack) 4290 { 4291 struct vxlan_config conf; 4292 int err; 4293 4294 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack); 4295 if (err) 4296 return err; 4297 4298 return __vxlan_dev_create(src_net, dev, &conf, extack); 4299 } 4300 4301 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 4302 struct nlattr *data[], 4303 struct netlink_ext_ack *extack) 4304 { 4305 struct vxlan_dev *vxlan = netdev_priv(dev); 4306 struct net_device *lowerdev; 4307 struct vxlan_config conf; 4308 struct vxlan_rdst *dst; 4309 int err; 4310 4311 dst = &vxlan->default_dst; 4312 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack); 4313 if (err) 4314 return err; 4315 4316 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev, 4317 vxlan, extack); 4318 if (err) 4319 return err; 4320 4321 if (dst->remote_dev == lowerdev) 4322 lowerdev = NULL; 4323 4324 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev, 4325 extack); 4326 if (err) 4327 return err; 4328 4329 /* handle default dst entry */ 4330 if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) { 4331 u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni); 4332 4333 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4334 if (!vxlan_addr_any(&conf.remote_ip)) { 4335 err = vxlan_fdb_update(vxlan, all_zeros_mac, 4336 &conf.remote_ip, 4337 NUD_REACHABLE | NUD_PERMANENT, 4338 NLM_F_APPEND | NLM_F_CREATE, 4339 vxlan->cfg.dst_port, 4340 conf.vni, conf.vni, 4341 conf.remote_ifindex, 4342 NTF_SELF, 0, true, extack); 4343 if (err) { 4344 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4345 netdev_adjacent_change_abort(dst->remote_dev, 4346 lowerdev, dev); 4347 return err; 4348 } 4349 } 4350 if (!vxlan_addr_any(&dst->remote_ip)) 4351 __vxlan_fdb_delete(vxlan, all_zeros_mac, 4352 dst->remote_ip, 4353 vxlan->cfg.dst_port, 4354 dst->remote_vni, 4355 dst->remote_vni, 4356 dst->remote_ifindex, 4357 true); 4358 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4359 4360 /* If vni filtering device, also update fdb entries of 4361 * all vnis that were using default remote ip 4362 */ 4363 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 4364 err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip, 4365 &conf.remote_ip, extack); 4366 if (err) { 4367 netdev_adjacent_change_abort(dst->remote_dev, 4368 lowerdev, dev); 4369 return err; 4370 } 4371 } 4372 } 4373 4374 if (conf.age_interval != vxlan->cfg.age_interval) 4375 mod_timer(&vxlan->age_timer, jiffies); 4376 4377 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev); 4378 if (lowerdev && lowerdev != dst->remote_dev) 4379 dst->remote_dev = lowerdev; 4380 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true); 4381 return 0; 4382 } 4383 4384 static void vxlan_dellink(struct net_device *dev, struct list_head *head) 4385 { 4386 struct vxlan_dev *vxlan = netdev_priv(dev); 4387 struct vxlan_fdb_flush_desc desc = { 4388 /* Default entry is deleted at vxlan_uninit. */ 4389 .ignore_default_entry = true, 4390 }; 4391 4392 vxlan_flush(vxlan, &desc); 4393 4394 list_del(&vxlan->next); 4395 unregister_netdevice_queue(dev, head); 4396 if (vxlan->default_dst.remote_dev) 4397 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev); 4398 } 4399 4400 static size_t vxlan_get_size(const struct net_device *dev) 4401 { 4402 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ 4403 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */ 4404 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ 4405 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */ 4406 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ 4407 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */ 4408 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ 4409 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */ 4410 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */ 4411 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LABEL_POLICY */ 4412 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ 4413 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ 4414 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ 4415 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ 4416 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ 4417 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */ 4418 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ 4419 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ 4420 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */ 4421 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */ 4422 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */ 4423 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */ 4424 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */ 4425 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */ 4426 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */ 4427 /* IFLA_VXLAN_PORT_RANGE */ 4428 nla_total_size(sizeof(struct ifla_vxlan_port_range)) + 4429 nla_total_size(0) + /* IFLA_VXLAN_GBP */ 4430 nla_total_size(0) + /* IFLA_VXLAN_GPE */ 4431 nla_total_size(0) + /* IFLA_VXLAN_REMCSUM_NOPARTIAL */ 4432 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_VNIFILTER */ 4433 0; 4434 } 4435 4436 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 4437 { 4438 const struct vxlan_dev *vxlan = netdev_priv(dev); 4439 const struct vxlan_rdst *dst = &vxlan->default_dst; 4440 struct ifla_vxlan_port_range ports = { 4441 .low = htons(vxlan->cfg.port_min), 4442 .high = htons(vxlan->cfg.port_max), 4443 }; 4444 4445 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni))) 4446 goto nla_put_failure; 4447 4448 if (!vxlan_addr_any(&dst->remote_ip)) { 4449 if (dst->remote_ip.sa.sa_family == AF_INET) { 4450 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP, 4451 dst->remote_ip.sin.sin_addr.s_addr)) 4452 goto nla_put_failure; 4453 #if IS_ENABLED(CONFIG_IPV6) 4454 } else { 4455 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6, 4456 &dst->remote_ip.sin6.sin6_addr)) 4457 goto nla_put_failure; 4458 #endif 4459 } 4460 } 4461 4462 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) 4463 goto nla_put_failure; 4464 4465 if (!vxlan_addr_any(&vxlan->cfg.saddr)) { 4466 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) { 4467 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL, 4468 vxlan->cfg.saddr.sin.sin_addr.s_addr)) 4469 goto nla_put_failure; 4470 #if IS_ENABLED(CONFIG_IPV6) 4471 } else { 4472 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6, 4473 &vxlan->cfg.saddr.sin6.sin6_addr)) 4474 goto nla_put_failure; 4475 #endif 4476 } 4477 } 4478 4479 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) || 4480 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT, 4481 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) || 4482 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) || 4483 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) || 4484 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) || 4485 nla_put_u32(skb, IFLA_VXLAN_LABEL_POLICY, vxlan->cfg.label_policy) || 4486 nla_put_u8(skb, IFLA_VXLAN_LEARNING, 4487 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) || 4488 nla_put_u8(skb, IFLA_VXLAN_PROXY, 4489 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) || 4490 nla_put_u8(skb, IFLA_VXLAN_RSC, 4491 !!(vxlan->cfg.flags & VXLAN_F_RSC)) || 4492 nla_put_u8(skb, IFLA_VXLAN_L2MISS, 4493 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) || 4494 nla_put_u8(skb, IFLA_VXLAN_L3MISS, 4495 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) || 4496 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA, 4497 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) || 4498 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) || 4499 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) || 4500 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) || 4501 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM, 4502 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) || 4503 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4504 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) || 4505 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4506 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) || 4507 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX, 4508 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) || 4509 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX, 4510 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) || 4511 nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS, 4512 !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS))) 4513 goto nla_put_failure; 4514 4515 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) 4516 goto nla_put_failure; 4517 4518 if (vxlan->cfg.flags & VXLAN_F_GBP && 4519 nla_put_flag(skb, IFLA_VXLAN_GBP)) 4520 goto nla_put_failure; 4521 4522 if (vxlan->cfg.flags & VXLAN_F_GPE && 4523 nla_put_flag(skb, IFLA_VXLAN_GPE)) 4524 goto nla_put_failure; 4525 4526 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL && 4527 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL)) 4528 goto nla_put_failure; 4529 4530 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER && 4531 nla_put_u8(skb, IFLA_VXLAN_VNIFILTER, 4532 !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER))) 4533 goto nla_put_failure; 4534 4535 return 0; 4536 4537 nla_put_failure: 4538 return -EMSGSIZE; 4539 } 4540 4541 static struct net *vxlan_get_link_net(const struct net_device *dev) 4542 { 4543 struct vxlan_dev *vxlan = netdev_priv(dev); 4544 4545 return vxlan->net; 4546 } 4547 4548 static struct rtnl_link_ops vxlan_link_ops __read_mostly = { 4549 .kind = "vxlan", 4550 .maxtype = IFLA_VXLAN_MAX, 4551 .policy = vxlan_policy, 4552 .priv_size = sizeof(struct vxlan_dev), 4553 .setup = vxlan_setup, 4554 .validate = vxlan_validate, 4555 .newlink = vxlan_newlink, 4556 .changelink = vxlan_changelink, 4557 .dellink = vxlan_dellink, 4558 .get_size = vxlan_get_size, 4559 .fill_info = vxlan_fill_info, 4560 .get_link_net = vxlan_get_link_net, 4561 }; 4562 4563 struct net_device *vxlan_dev_create(struct net *net, const char *name, 4564 u8 name_assign_type, 4565 struct vxlan_config *conf) 4566 { 4567 struct nlattr *tb[IFLA_MAX + 1]; 4568 struct net_device *dev; 4569 int err; 4570 4571 memset(&tb, 0, sizeof(tb)); 4572 4573 dev = rtnl_create_link(net, name, name_assign_type, 4574 &vxlan_link_ops, tb, NULL); 4575 if (IS_ERR(dev)) 4576 return dev; 4577 4578 err = __vxlan_dev_create(net, dev, conf, NULL); 4579 if (err < 0) { 4580 free_netdev(dev); 4581 return ERR_PTR(err); 4582 } 4583 4584 err = rtnl_configure_link(dev, NULL, 0, NULL); 4585 if (err < 0) { 4586 LIST_HEAD(list_kill); 4587 4588 vxlan_dellink(dev, &list_kill); 4589 unregister_netdevice_many(&list_kill); 4590 return ERR_PTR(err); 4591 } 4592 4593 return dev; 4594 } 4595 EXPORT_SYMBOL_GPL(vxlan_dev_create); 4596 4597 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn, 4598 struct net_device *dev) 4599 { 4600 struct vxlan_dev *vxlan, *next; 4601 LIST_HEAD(list_kill); 4602 4603 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { 4604 struct vxlan_rdst *dst = &vxlan->default_dst; 4605 4606 /* In case we created vxlan device with carrier 4607 * and we loose the carrier due to module unload 4608 * we also need to remove vxlan device. In other 4609 * cases, it's not necessary and remote_ifindex 4610 * is 0 here, so no matches. 4611 */ 4612 if (dst->remote_ifindex == dev->ifindex) 4613 vxlan_dellink(vxlan->dev, &list_kill); 4614 } 4615 4616 unregister_netdevice_many(&list_kill); 4617 } 4618 4619 static int vxlan_netdevice_event(struct notifier_block *unused, 4620 unsigned long event, void *ptr) 4621 { 4622 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4623 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); 4624 4625 if (event == NETDEV_UNREGISTER) 4626 vxlan_handle_lowerdev_unregister(vn, dev); 4627 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 4628 vxlan_offload_rx_ports(dev, true); 4629 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 4630 vxlan_offload_rx_ports(dev, false); 4631 4632 return NOTIFY_DONE; 4633 } 4634 4635 static struct notifier_block vxlan_notifier_block __read_mostly = { 4636 .notifier_call = vxlan_netdevice_event, 4637 }; 4638 4639 static void 4640 vxlan_fdb_offloaded_set(struct net_device *dev, 4641 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4642 { 4643 struct vxlan_dev *vxlan = netdev_priv(dev); 4644 struct vxlan_rdst *rdst; 4645 struct vxlan_fdb *f; 4646 u32 hash_index; 4647 4648 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4649 4650 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4651 4652 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4653 if (!f) 4654 goto out; 4655 4656 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip, 4657 fdb_info->remote_port, 4658 fdb_info->remote_vni, 4659 fdb_info->remote_ifindex); 4660 if (!rdst) 4661 goto out; 4662 4663 rdst->offloaded = fdb_info->offloaded; 4664 4665 out: 4666 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4667 } 4668 4669 static int 4670 vxlan_fdb_external_learn_add(struct net_device *dev, 4671 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4672 { 4673 struct vxlan_dev *vxlan = netdev_priv(dev); 4674 struct netlink_ext_ack *extack; 4675 u32 hash_index; 4676 int err; 4677 4678 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4679 extack = switchdev_notifier_info_to_extack(&fdb_info->info); 4680 4681 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4682 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip, 4683 NUD_REACHABLE, 4684 NLM_F_CREATE | NLM_F_REPLACE, 4685 fdb_info->remote_port, 4686 fdb_info->vni, 4687 fdb_info->remote_vni, 4688 fdb_info->remote_ifindex, 4689 NTF_USE | NTF_SELF | NTF_EXT_LEARNED, 4690 0, false, extack); 4691 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4692 4693 return err; 4694 } 4695 4696 static int 4697 vxlan_fdb_external_learn_del(struct net_device *dev, 4698 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4699 { 4700 struct vxlan_dev *vxlan = netdev_priv(dev); 4701 struct vxlan_fdb *f; 4702 u32 hash_index; 4703 int err = 0; 4704 4705 hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni); 4706 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4707 4708 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4709 if (!f) 4710 err = -ENOENT; 4711 else if (f->flags & NTF_EXT_LEARNED) 4712 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr, 4713 fdb_info->remote_ip, 4714 fdb_info->remote_port, 4715 fdb_info->vni, 4716 fdb_info->remote_vni, 4717 fdb_info->remote_ifindex, 4718 false); 4719 4720 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4721 4722 return err; 4723 } 4724 4725 static int vxlan_switchdev_event(struct notifier_block *unused, 4726 unsigned long event, void *ptr) 4727 { 4728 struct net_device *dev = switchdev_notifier_info_to_dev(ptr); 4729 struct switchdev_notifier_vxlan_fdb_info *fdb_info; 4730 int err = 0; 4731 4732 switch (event) { 4733 case SWITCHDEV_VXLAN_FDB_OFFLOADED: 4734 vxlan_fdb_offloaded_set(dev, ptr); 4735 break; 4736 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE: 4737 fdb_info = ptr; 4738 err = vxlan_fdb_external_learn_add(dev, fdb_info); 4739 if (err) { 4740 err = notifier_from_errno(err); 4741 break; 4742 } 4743 fdb_info->offloaded = true; 4744 vxlan_fdb_offloaded_set(dev, fdb_info); 4745 break; 4746 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE: 4747 fdb_info = ptr; 4748 err = vxlan_fdb_external_learn_del(dev, fdb_info); 4749 if (err) { 4750 err = notifier_from_errno(err); 4751 break; 4752 } 4753 fdb_info->offloaded = false; 4754 vxlan_fdb_offloaded_set(dev, fdb_info); 4755 break; 4756 } 4757 4758 return err; 4759 } 4760 4761 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = { 4762 .notifier_call = vxlan_switchdev_event, 4763 }; 4764 4765 static void vxlan_fdb_nh_flush(struct nexthop *nh) 4766 { 4767 struct vxlan_fdb *fdb; 4768 struct vxlan_dev *vxlan; 4769 u32 hash_index; 4770 4771 rcu_read_lock(); 4772 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) { 4773 vxlan = rcu_dereference(fdb->vdev); 4774 WARN_ON(!vxlan); 4775 hash_index = fdb_head_index(vxlan, fdb->eth_addr, 4776 vxlan->default_dst.remote_vni); 4777 spin_lock_bh(&vxlan->hash_lock[hash_index]); 4778 if (!hlist_unhashed(&fdb->hlist)) 4779 vxlan_fdb_destroy(vxlan, fdb, false, false); 4780 spin_unlock_bh(&vxlan->hash_lock[hash_index]); 4781 } 4782 rcu_read_unlock(); 4783 } 4784 4785 static int vxlan_nexthop_event(struct notifier_block *nb, 4786 unsigned long event, void *ptr) 4787 { 4788 struct nh_notifier_info *info = ptr; 4789 struct nexthop *nh; 4790 4791 if (event != NEXTHOP_EVENT_DEL) 4792 return NOTIFY_DONE; 4793 4794 nh = nexthop_find_by_id(info->net, info->id); 4795 if (!nh) 4796 return NOTIFY_DONE; 4797 4798 vxlan_fdb_nh_flush(nh); 4799 4800 return NOTIFY_DONE; 4801 } 4802 4803 static __net_init int vxlan_init_net(struct net *net) 4804 { 4805 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4806 unsigned int h; 4807 4808 INIT_LIST_HEAD(&vn->vxlan_list); 4809 spin_lock_init(&vn->sock_lock); 4810 vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event; 4811 4812 for (h = 0; h < PORT_HASH_SIZE; ++h) 4813 INIT_HLIST_HEAD(&vn->sock_list[h]); 4814 4815 return register_nexthop_notifier(net, &vn->nexthop_notifier_block, 4816 NULL); 4817 } 4818 4819 static void __net_exit vxlan_destroy_tunnels(struct vxlan_net *vn, 4820 struct list_head *dev_to_kill) 4821 { 4822 struct vxlan_dev *vxlan, *next; 4823 4824 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) 4825 vxlan_dellink(vxlan->dev, dev_to_kill); 4826 } 4827 4828 static void __net_exit vxlan_exit_batch_rtnl(struct list_head *net_list, 4829 struct list_head *dev_to_kill) 4830 { 4831 struct net *net; 4832 4833 ASSERT_RTNL(); 4834 list_for_each_entry(net, net_list, exit_list) { 4835 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4836 4837 __unregister_nexthop_notifier(net, &vn->nexthop_notifier_block); 4838 4839 vxlan_destroy_tunnels(vn, dev_to_kill); 4840 } 4841 } 4842 4843 static void __net_exit vxlan_exit_net(struct net *net) 4844 { 4845 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4846 unsigned int h; 4847 4848 for (h = 0; h < PORT_HASH_SIZE; ++h) 4849 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h])); 4850 } 4851 4852 static struct pernet_operations vxlan_net_ops = { 4853 .init = vxlan_init_net, 4854 .exit_batch_rtnl = vxlan_exit_batch_rtnl, 4855 .exit = vxlan_exit_net, 4856 .id = &vxlan_net_id, 4857 .size = sizeof(struct vxlan_net), 4858 }; 4859 4860 static int __init vxlan_init_module(void) 4861 { 4862 int rc; 4863 4864 get_random_bytes(&vxlan_salt, sizeof(vxlan_salt)); 4865 4866 rc = register_pernet_subsys(&vxlan_net_ops); 4867 if (rc) 4868 goto out1; 4869 4870 rc = register_netdevice_notifier(&vxlan_notifier_block); 4871 if (rc) 4872 goto out2; 4873 4874 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block); 4875 if (rc) 4876 goto out3; 4877 4878 rc = rtnl_link_register(&vxlan_link_ops); 4879 if (rc) 4880 goto out4; 4881 4882 vxlan_vnifilter_init(); 4883 4884 return 0; 4885 out4: 4886 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4887 out3: 4888 unregister_netdevice_notifier(&vxlan_notifier_block); 4889 out2: 4890 unregister_pernet_subsys(&vxlan_net_ops); 4891 out1: 4892 return rc; 4893 } 4894 late_initcall(vxlan_init_module); 4895 4896 static void __exit vxlan_cleanup_module(void) 4897 { 4898 vxlan_vnifilter_uninit(); 4899 rtnl_link_unregister(&vxlan_link_ops); 4900 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 4901 unregister_netdevice_notifier(&vxlan_notifier_block); 4902 unregister_pernet_subsys(&vxlan_net_ops); 4903 /* rcu_barrier() is called by netns */ 4904 } 4905 module_exit(vxlan_cleanup_module); 4906 4907 MODULE_LICENSE("GPL"); 4908 MODULE_VERSION(VXLAN_VERSION); 4909 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); 4910 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic"); 4911 MODULE_ALIAS_RTNL_LINK("vxlan"); 4912