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 <linux/rhashtable.h> 19 #include <net/arp.h> 20 #include <net/ndisc.h> 21 #include <net/gro.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/netdev_lock.h> 29 #include <net/tun_proto.h> 30 #include <net/vxlan.h> 31 #include <net/nexthop.h> 32 33 #if IS_ENABLED(CONFIG_IPV6) 34 #include <net/ip6_tunnel.h> 35 #include <net/ip6_checksum.h> 36 #endif 37 38 #include "vxlan_private.h" 39 40 #define VXLAN_VERSION "0.1" 41 42 #define FDB_AGE_DEFAULT 300 /* 5 min */ 43 #define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */ 44 45 /* UDP port for VXLAN traffic. 46 * The IANA assigned port is 4789, but the Linux default is 8472 47 * for compatibility with early adopters. 48 */ 49 static unsigned short vxlan_port __read_mostly = 8472; 50 module_param_named(udp_port, vxlan_port, ushort, 0444); 51 MODULE_PARM_DESC(udp_port, "Destination UDP port"); 52 53 static bool log_ecn_error = true; 54 module_param(log_ecn_error, bool, 0644); 55 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 56 57 unsigned int vxlan_net_id; 58 59 const u8 all_zeros_mac[ETH_ALEN + 2]; 60 static struct rtnl_link_ops vxlan_link_ops; 61 62 static int vxlan_sock_add(struct vxlan_dev *vxlan); 63 64 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan); 65 66 static const struct rhashtable_params vxlan_fdb_rht_params = { 67 .head_offset = offsetof(struct vxlan_fdb, rhnode), 68 .key_offset = offsetof(struct vxlan_fdb, key), 69 .key_len = sizeof(struct vxlan_fdb_key), 70 .automatic_shrinking = true, 71 }; 72 73 static inline bool vxlan_collect_metadata(struct vxlan_sock *vs) 74 { 75 return vs->flags & VXLAN_F_COLLECT_METADATA || 76 ip_tunnel_collect_metadata(); 77 } 78 79 /* Find VXLAN socket based on network namespace, address family, UDP port, 80 * enabled unshareable flags and socket device binding (see l3mdev with 81 * non-default VRF). 82 */ 83 static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family, 84 __be16 port, u32 flags, int ifindex) 85 { 86 struct vxlan_sock *vs; 87 88 flags &= VXLAN_F_RCV_FLAGS; 89 90 hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) { 91 if (inet_sk(vs->sk)->inet_sport == port && 92 vxlan_get_sk_family(vs) == family && 93 vs->flags == flags && 94 vs->sk->sk_bound_dev_if == ifindex) 95 return vs; 96 } 97 return NULL; 98 } 99 100 static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, 101 int ifindex, __be32 vni, 102 struct vxlan_vni_node **vninode) 103 { 104 struct vxlan_vni_node *vnode; 105 struct vxlan_dev_node *node; 106 107 /* For flow based devices, map all packets to VNI 0 */ 108 if (vs->flags & VXLAN_F_COLLECT_METADATA && 109 !(vs->flags & VXLAN_F_VNIFILTER)) 110 vni = 0; 111 112 hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) { 113 if (!node->vxlan) 114 continue; 115 vnode = NULL; 116 if (node->vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 117 vnode = vxlan_vnifilter_lookup(node->vxlan, vni); 118 if (!vnode) 119 continue; 120 } else if (node->vxlan->default_dst.remote_vni != vni) { 121 continue; 122 } 123 124 if (IS_ENABLED(CONFIG_IPV6)) { 125 const struct vxlan_config *cfg = &node->vxlan->cfg; 126 127 if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) && 128 cfg->remote_ifindex != ifindex) 129 continue; 130 } 131 132 if (vninode) 133 *vninode = vnode; 134 return node->vxlan; 135 } 136 137 return NULL; 138 } 139 140 /* Look up VNI in a per net namespace table */ 141 static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex, 142 __be32 vni, sa_family_t family, 143 __be16 port, u32 flags) 144 { 145 struct vxlan_sock *vs; 146 147 vs = vxlan_find_sock(net, family, port, flags, ifindex); 148 if (!vs) 149 return NULL; 150 151 return vxlan_vs_find_vni(vs, ifindex, vni, NULL); 152 } 153 154 /* Fill in neighbour message in skbuff. */ 155 static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan, 156 const struct vxlan_fdb *fdb, 157 u32 portid, u32 seq, int type, unsigned int flags, 158 const struct vxlan_rdst *rdst) 159 { 160 unsigned long now = jiffies; 161 struct nda_cacheinfo ci; 162 bool send_ip, send_eth; 163 struct nlmsghdr *nlh; 164 struct nexthop *nh; 165 struct ndmsg *ndm; 166 int nh_family; 167 u32 nh_id; 168 169 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); 170 if (nlh == NULL) 171 return -EMSGSIZE; 172 173 ndm = nlmsg_data(nlh); 174 memset(ndm, 0, sizeof(*ndm)); 175 176 send_eth = send_ip = true; 177 178 rcu_read_lock(); 179 nh = rcu_dereference(fdb->nh); 180 if (nh) { 181 nh_family = nexthop_get_family(nh); 182 nh_id = nh->id; 183 } 184 rcu_read_unlock(); 185 186 if (type == RTM_GETNEIGH) { 187 if (rdst) { 188 send_ip = !vxlan_addr_any(&rdst->remote_ip); 189 ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET; 190 } else if (nh) { 191 ndm->ndm_family = nh_family; 192 } 193 send_eth = !is_zero_ether_addr(fdb->key.eth_addr); 194 } else 195 ndm->ndm_family = AF_BRIDGE; 196 ndm->ndm_state = fdb->state; 197 ndm->ndm_ifindex = vxlan->dev->ifindex; 198 ndm->ndm_flags = fdb->flags; 199 if (rdst && rdst->offloaded) 200 ndm->ndm_flags |= NTF_OFFLOADED; 201 ndm->ndm_type = RTN_UNICAST; 202 203 if (!net_eq(dev_net(vxlan->dev), vxlan->net) && 204 nla_put_s32(skb, NDA_LINK_NETNSID, 205 peernet2id(dev_net(vxlan->dev), vxlan->net))) 206 goto nla_put_failure; 207 208 if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.eth_addr)) 209 goto nla_put_failure; 210 if (nh) { 211 if (nla_put_u32(skb, NDA_NH_ID, nh_id)) 212 goto nla_put_failure; 213 } else if (rdst) { 214 if (send_ip && vxlan_nla_put_addr(skb, NDA_DST, 215 &rdst->remote_ip)) 216 goto nla_put_failure; 217 218 if (rdst->remote_port && 219 rdst->remote_port != vxlan->cfg.dst_port && 220 nla_put_be16(skb, NDA_PORT, rdst->remote_port)) 221 goto nla_put_failure; 222 if (rdst->remote_vni != vxlan->default_dst.remote_vni && 223 nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni))) 224 goto nla_put_failure; 225 if (rdst->remote_ifindex && 226 nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex)) 227 goto nla_put_failure; 228 } 229 230 if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->key.vni && 231 nla_put_u32(skb, NDA_SRC_VNI, 232 be32_to_cpu(fdb->key.vni))) 233 goto nla_put_failure; 234 235 ci.ndm_used = jiffies_to_clock_t(now - READ_ONCE(fdb->used)); 236 ci.ndm_confirmed = 0; 237 ci.ndm_updated = jiffies_to_clock_t(now - READ_ONCE(fdb->updated)); 238 ci.ndm_refcnt = 0; 239 240 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) 241 goto nla_put_failure; 242 243 nlmsg_end(skb, nlh); 244 return 0; 245 246 nla_put_failure: 247 nlmsg_cancel(skb, nlh); 248 return -EMSGSIZE; 249 } 250 251 static inline size_t vxlan_nlmsg_size(void) 252 { 253 return NLMSG_ALIGN(sizeof(struct ndmsg)) 254 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ 255 + nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */ 256 + nla_total_size(sizeof(__be16)) /* NDA_PORT */ 257 + nla_total_size(sizeof(__be32)) /* NDA_VNI */ 258 + nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */ 259 + nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */ 260 + nla_total_size(sizeof(struct nda_cacheinfo)); 261 } 262 263 static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 264 struct vxlan_rdst *rd, int type) 265 { 266 struct net *net = dev_net(vxlan->dev); 267 struct sk_buff *skb; 268 int err = -ENOBUFS; 269 270 skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC); 271 if (skb == NULL) 272 goto errout; 273 274 err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd); 275 if (err < 0) { 276 /* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */ 277 WARN_ON(err == -EMSGSIZE); 278 kfree_skb(skb); 279 goto errout; 280 } 281 282 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); 283 return; 284 errout: 285 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); 286 } 287 288 static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan, 289 const struct vxlan_fdb *fdb, 290 const struct vxlan_rdst *rd, 291 struct netlink_ext_ack *extack, 292 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 293 { 294 fdb_info->info.dev = vxlan->dev; 295 fdb_info->info.extack = extack; 296 fdb_info->remote_ip = rd->remote_ip; 297 fdb_info->remote_port = rd->remote_port; 298 fdb_info->remote_vni = rd->remote_vni; 299 fdb_info->remote_ifindex = rd->remote_ifindex; 300 memcpy(fdb_info->eth_addr, fdb->key.eth_addr, ETH_ALEN); 301 fdb_info->vni = fdb->key.vni; 302 fdb_info->offloaded = rd->offloaded; 303 fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER; 304 } 305 306 static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan, 307 struct vxlan_fdb *fdb, 308 struct vxlan_rdst *rd, 309 bool adding, 310 struct netlink_ext_ack *extack) 311 { 312 struct switchdev_notifier_vxlan_fdb_info info; 313 enum switchdev_notifier_type notifier_type; 314 int ret; 315 316 if (WARN_ON(!rd)) 317 return 0; 318 319 notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE 320 : SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE; 321 vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info); 322 ret = call_switchdev_notifiers(notifier_type, vxlan->dev, 323 &info.info, extack); 324 return notifier_to_errno(ret); 325 } 326 327 static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 328 struct vxlan_rdst *rd, int type, bool swdev_notify, 329 struct netlink_ext_ack *extack) 330 { 331 int err; 332 333 if (swdev_notify && rd) { 334 switch (type) { 335 case RTM_NEWNEIGH: 336 err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 337 true, extack); 338 if (err) 339 return err; 340 break; 341 case RTM_DELNEIGH: 342 vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd, 343 false, extack); 344 break; 345 } 346 } 347 348 __vxlan_fdb_notify(vxlan, fdb, rd, type); 349 return 0; 350 } 351 352 static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa) 353 { 354 struct vxlan_dev *vxlan = netdev_priv(dev); 355 struct vxlan_fdb f = { 356 .state = NUD_STALE, 357 }; 358 struct vxlan_rdst remote = { 359 .remote_ip = *ipa, /* goes to NDA_DST */ 360 .remote_vni = cpu_to_be32(VXLAN_N_VID), 361 }; 362 363 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 364 } 365 366 static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN]) 367 { 368 struct vxlan_fdb f = { 369 .state = NUD_STALE, 370 }; 371 struct vxlan_rdst remote = { }; 372 373 memcpy(f.key.eth_addr, eth_addr, ETH_ALEN); 374 375 vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL); 376 } 377 378 /* Look up Ethernet address in forwarding table */ 379 static struct vxlan_fdb *vxlan_find_mac_rcu(struct vxlan_dev *vxlan, 380 const u8 *mac, __be32 vni) 381 { 382 struct vxlan_fdb_key key; 383 384 memset(&key, 0, sizeof(key)); 385 memcpy(key.eth_addr, mac, sizeof(key.eth_addr)); 386 if (!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) 387 key.vni = vxlan->default_dst.remote_vni; 388 else 389 key.vni = vni; 390 391 return rhashtable_lookup(&vxlan->fdb_hash_tbl, &key, 392 vxlan_fdb_rht_params); 393 } 394 395 static struct vxlan_fdb *vxlan_find_mac_tx(struct vxlan_dev *vxlan, 396 const u8 *mac, __be32 vni) 397 { 398 struct vxlan_fdb *f; 399 400 f = vxlan_find_mac_rcu(vxlan, mac, vni); 401 if (f) { 402 unsigned long now = jiffies; 403 404 if (READ_ONCE(f->used) != now) 405 WRITE_ONCE(f->used, now); 406 } 407 408 return f; 409 } 410 411 static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan, 412 const u8 *mac, __be32 vni) 413 { 414 struct vxlan_fdb *f; 415 416 lockdep_assert_held_once(&vxlan->hash_lock); 417 418 rcu_read_lock(); 419 f = vxlan_find_mac_rcu(vxlan, mac, vni); 420 rcu_read_unlock(); 421 422 return f; 423 } 424 425 /* caller should hold vxlan->hash_lock */ 426 static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f, 427 union vxlan_addr *ip, __be16 port, 428 __be32 vni, __u32 ifindex) 429 { 430 struct vxlan_rdst *rd; 431 432 list_for_each_entry(rd, &f->remotes, list) { 433 if (vxlan_addr_equal(&rd->remote_ip, ip) && 434 rd->remote_port == port && 435 rd->remote_vni == vni && 436 rd->remote_ifindex == ifindex) 437 return rd; 438 } 439 440 return NULL; 441 } 442 443 int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, 444 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 445 { 446 struct vxlan_dev *vxlan = netdev_priv(dev); 447 u8 eth_addr[ETH_ALEN + 2] = { 0 }; 448 struct vxlan_rdst *rdst = NULL; 449 struct vxlan_fdb *f; 450 int rc = 0; 451 452 if (is_multicast_ether_addr(mac) || 453 is_zero_ether_addr(mac)) 454 return -EINVAL; 455 456 ether_addr_copy(eth_addr, mac); 457 458 rcu_read_lock(); 459 460 f = vxlan_find_mac_rcu(vxlan, eth_addr, vni); 461 if (f) 462 rdst = first_remote_rcu(f); 463 if (!rdst) { 464 rc = -ENOENT; 465 goto out; 466 } 467 468 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info); 469 470 out: 471 rcu_read_unlock(); 472 return rc; 473 } 474 EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc); 475 476 static int vxlan_fdb_notify_one(struct notifier_block *nb, 477 const struct vxlan_dev *vxlan, 478 const struct vxlan_fdb *f, 479 const struct vxlan_rdst *rdst, 480 struct netlink_ext_ack *extack) 481 { 482 struct switchdev_notifier_vxlan_fdb_info fdb_info; 483 int rc; 484 485 vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info); 486 rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE, 487 &fdb_info); 488 return notifier_to_errno(rc); 489 } 490 491 int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, 492 struct notifier_block *nb, 493 struct netlink_ext_ack *extack) 494 { 495 struct vxlan_dev *vxlan; 496 struct vxlan_rdst *rdst; 497 struct vxlan_fdb *f; 498 int rc = 0; 499 500 if (!netif_is_vxlan(dev)) 501 return -EINVAL; 502 vxlan = netdev_priv(dev); 503 504 spin_lock_bh(&vxlan->hash_lock); 505 hlist_for_each_entry(f, &vxlan->fdb_list, fdb_node) { 506 if (f->key.vni == vni) { 507 list_for_each_entry(rdst, &f->remotes, list) { 508 rc = vxlan_fdb_notify_one(nb, vxlan, f, rdst, 509 extack); 510 if (rc) 511 goto unlock; 512 } 513 } 514 } 515 spin_unlock_bh(&vxlan->hash_lock); 516 return 0; 517 518 unlock: 519 spin_unlock_bh(&vxlan->hash_lock); 520 return rc; 521 } 522 EXPORT_SYMBOL_GPL(vxlan_fdb_replay); 523 524 void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) 525 { 526 struct vxlan_dev *vxlan; 527 struct vxlan_rdst *rdst; 528 struct vxlan_fdb *f; 529 530 if (!netif_is_vxlan(dev)) 531 return; 532 vxlan = netdev_priv(dev); 533 534 spin_lock_bh(&vxlan->hash_lock); 535 hlist_for_each_entry(f, &vxlan->fdb_list, fdb_node) { 536 if (f->key.vni == vni) { 537 list_for_each_entry(rdst, &f->remotes, list) 538 rdst->offloaded = false; 539 } 540 } 541 spin_unlock_bh(&vxlan->hash_lock); 542 543 } 544 EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload); 545 546 /* Replace destination of unicast mac */ 547 static int vxlan_fdb_replace(struct vxlan_fdb *f, 548 union vxlan_addr *ip, __be16 port, __be32 vni, 549 __u32 ifindex, struct vxlan_rdst *oldrd) 550 { 551 struct vxlan_rdst *rd; 552 553 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 554 if (rd) 555 return 0; 556 557 rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list); 558 if (!rd) 559 return 0; 560 561 *oldrd = *rd; 562 dst_cache_reset(&rd->dst_cache); 563 rd->remote_ip = *ip; 564 rd->remote_port = port; 565 rd->remote_vni = vni; 566 rd->remote_ifindex = ifindex; 567 rd->offloaded = false; 568 return 1; 569 } 570 571 /* Add/update destinations for multicast */ 572 static int vxlan_fdb_append(struct vxlan_fdb *f, 573 union vxlan_addr *ip, __be16 port, __be32 vni, 574 __u32 ifindex, struct vxlan_rdst **rdp) 575 { 576 struct vxlan_rdst *rd; 577 578 rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex); 579 if (rd) 580 return 0; 581 582 rd = kmalloc_obj(*rd, GFP_ATOMIC); 583 if (rd == NULL) 584 return -ENOMEM; 585 586 /* The driver can work correctly without a dst cache, so do not treat 587 * dst cache initialization errors as fatal. 588 */ 589 dst_cache_init(&rd->dst_cache, GFP_ATOMIC | __GFP_NOWARN); 590 591 rd->remote_ip = *ip; 592 rd->remote_port = port; 593 rd->offloaded = false; 594 rd->remote_vni = vni; 595 rd->remote_ifindex = ifindex; 596 597 list_add_tail_rcu(&rd->list, &f->remotes); 598 599 *rdp = rd; 600 return 1; 601 } 602 603 static bool vxlan_parse_gpe_proto(const struct vxlanhdr *hdr, __be16 *protocol) 604 { 605 const struct vxlanhdr_gpe *gpe = (const struct vxlanhdr_gpe *)hdr; 606 607 /* Need to have Next Protocol set for interfaces in GPE mode. */ 608 if (!gpe->np_applied) 609 return false; 610 /* "The initial version is 0. If a receiver does not support the 611 * version indicated it MUST drop the packet. 612 */ 613 if (gpe->version != 0) 614 return false; 615 /* "When the O bit is set to 1, the packet is an OAM packet and OAM 616 * processing MUST occur." However, we don't implement OAM 617 * processing, thus drop the packet. 618 */ 619 if (gpe->oam_flag) 620 return false; 621 622 *protocol = tun_p_to_eth_p(gpe->next_protocol); 623 if (!*protocol) 624 return false; 625 626 return true; 627 } 628 629 static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb, 630 unsigned int off, 631 struct vxlanhdr *vh, size_t hdrlen, 632 __be32 vni_field, 633 struct gro_remcsum *grc, 634 bool nopartial) 635 { 636 size_t start, offset; 637 638 if (skb->remcsum_offload) 639 return vh; 640 641 if (!NAPI_GRO_CB(skb)->csum_valid) 642 return NULL; 643 644 start = vxlan_rco_start(vni_field); 645 offset = start + vxlan_rco_offset(vni_field); 646 647 vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen, 648 start, offset, grc, nopartial); 649 650 skb->remcsum_offload = 1; 651 652 return vh; 653 } 654 655 static struct vxlanhdr *vxlan_gro_prepare_receive(struct sock *sk, 656 struct list_head *head, 657 struct sk_buff *skb, 658 struct gro_remcsum *grc) 659 { 660 struct vxlanhdr *vh, *vh2; 661 unsigned int hlen, off_vx; 662 struct vxlan_sock *vs; 663 struct sk_buff *p; 664 __be32 flags; 665 666 skb_gro_remcsum_init(grc); 667 668 vs = rcu_dereference_sk_user_data(sk); 669 if (!vs) 670 return NULL; 671 672 off_vx = skb_gro_offset(skb); 673 hlen = off_vx + sizeof(*vh); 674 vh = skb_gro_header(skb, hlen, off_vx); 675 if (unlikely(!vh)) 676 return NULL; 677 678 skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr)); 679 680 flags = vh->vx_flags; 681 682 if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) { 683 vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr), 684 vh->vx_vni, grc, 685 !!(vs->flags & 686 VXLAN_F_REMCSUM_NOPARTIAL)); 687 688 if (!vh) 689 return NULL; 690 } 691 692 skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */ 693 694 list_for_each_entry(p, head, list) { 695 if (!NAPI_GRO_CB(p)->same_flow) 696 continue; 697 698 vh2 = (struct vxlanhdr *)(p->data + off_vx); 699 if (vh->vx_flags != vh2->vx_flags || 700 vh->vx_vni != vh2->vx_vni) { 701 NAPI_GRO_CB(p)->same_flow = 0; 702 continue; 703 } 704 } 705 706 return vh; 707 } 708 709 static struct sk_buff *vxlan_gro_receive(struct sock *sk, 710 struct list_head *head, 711 struct sk_buff *skb) 712 { 713 struct sk_buff *pp = NULL; 714 struct gro_remcsum grc; 715 int flush = 1; 716 717 if (vxlan_gro_prepare_receive(sk, head, skb, &grc)) { 718 pp = call_gro_receive(eth_gro_receive, head, skb); 719 flush = 0; 720 } 721 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 722 return pp; 723 } 724 725 static struct sk_buff *vxlan_gpe_gro_receive(struct sock *sk, 726 struct list_head *head, 727 struct sk_buff *skb) 728 { 729 const struct packet_offload *ptype; 730 struct sk_buff *pp = NULL; 731 struct gro_remcsum grc; 732 struct vxlanhdr *vh; 733 __be16 protocol; 734 int flush = 1; 735 736 vh = vxlan_gro_prepare_receive(sk, head, skb, &grc); 737 if (vh) { 738 if (!vxlan_parse_gpe_proto(vh, &protocol)) 739 goto out; 740 ptype = gro_find_receive_by_type(protocol); 741 if (!ptype) 742 goto out; 743 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 744 flush = 0; 745 } 746 out: 747 skb_gro_flush_final_remcsum(skb, pp, flush, &grc); 748 return pp; 749 } 750 751 static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 752 { 753 /* Sets 'skb->inner_mac_header' since we are always called with 754 * 'skb->encapsulation' set. 755 */ 756 return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 757 } 758 759 static int vxlan_gpe_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff) 760 { 761 struct vxlanhdr *vh = (struct vxlanhdr *)(skb->data + nhoff); 762 const struct packet_offload *ptype; 763 int err = -ENOSYS; 764 __be16 protocol; 765 766 if (!vxlan_parse_gpe_proto(vh, &protocol)) 767 return err; 768 ptype = gro_find_complete_by_type(protocol); 769 if (ptype) 770 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct vxlanhdr)); 771 return err; 772 } 773 774 static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac, 775 __u16 state, __be32 src_vni, 776 __u16 ndm_flags) 777 { 778 struct vxlan_fdb *f; 779 780 f = kmalloc_obj(*f, GFP_ATOMIC); 781 if (!f) 782 return NULL; 783 memset(&f->key, 0, sizeof(f->key)); 784 f->state = state; 785 f->flags = ndm_flags; 786 f->updated = f->used = jiffies; 787 f->key.vni = src_vni; 788 f->nh = NULL; 789 RCU_INIT_POINTER(f->vdev, vxlan); 790 INIT_LIST_HEAD(&f->nh_list); 791 INIT_LIST_HEAD(&f->remotes); 792 memcpy(f->key.eth_addr, mac, ETH_ALEN); 793 794 return f; 795 } 796 797 static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb, 798 u32 nhid, struct netlink_ext_ack *extack) 799 { 800 struct nexthop *old_nh = rtnl_dereference(fdb->nh); 801 struct nexthop *nh; 802 int err = -EINVAL; 803 804 if (old_nh && old_nh->id == nhid) 805 return 0; 806 807 nh = nexthop_find_by_id(vxlan->net, nhid); 808 if (!nh) { 809 NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); 810 goto err_inval; 811 } 812 813 if (!nexthop_get(nh)) { 814 NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); 815 nh = NULL; 816 goto err_inval; 817 } 818 if (!nexthop_is_fdb(nh)) { 819 NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop"); 820 goto err_inval; 821 } 822 823 if (!nexthop_is_multipath(nh)) { 824 NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group"); 825 goto err_inval; 826 } 827 828 /* check nexthop group family */ 829 switch (vxlan->default_dst.remote_ip.sa.sa_family) { 830 case AF_INET: 831 if (!nexthop_has_v4(nh)) { 832 err = -EAFNOSUPPORT; 833 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 834 goto err_inval; 835 } 836 break; 837 case AF_INET6: 838 if (nexthop_has_v4(nh)) { 839 err = -EAFNOSUPPORT; 840 NL_SET_ERR_MSG(extack, "Nexthop group family not supported"); 841 goto err_inval; 842 } 843 } 844 845 if (old_nh) { 846 list_del_rcu(&fdb->nh_list); 847 nexthop_put(old_nh); 848 } 849 rcu_assign_pointer(fdb->nh, nh); 850 list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list); 851 return 1; 852 853 err_inval: 854 if (nh) 855 nexthop_put(nh); 856 return err; 857 } 858 859 int vxlan_fdb_create(struct vxlan_dev *vxlan, 860 const u8 *mac, union vxlan_addr *ip, 861 __u16 state, __be16 port, __be32 src_vni, 862 __be32 vni, __u32 ifindex, __u16 ndm_flags, 863 u32 nhid, struct vxlan_fdb **fdb, 864 struct netlink_ext_ack *extack) 865 { 866 struct vxlan_rdst *rd = NULL; 867 struct vxlan_fdb *f; 868 int rc; 869 870 if (vxlan->cfg.addrmax && 871 vxlan->addrcnt >= vxlan->cfg.addrmax) 872 return -ENOSPC; 873 874 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 875 f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags); 876 if (!f) 877 return -ENOMEM; 878 879 if (nhid) 880 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 881 else 882 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 883 if (rc < 0) 884 goto errout; 885 886 rc = rhashtable_lookup_insert_fast(&vxlan->fdb_hash_tbl, &f->rhnode, 887 vxlan_fdb_rht_params); 888 if (rc) 889 goto destroy_remote; 890 891 ++vxlan->addrcnt; 892 hlist_add_head_rcu(&f->fdb_node, &vxlan->fdb_list); 893 894 *fdb = f; 895 896 return 0; 897 898 destroy_remote: 899 if (rcu_access_pointer(f->nh)) { 900 list_del_rcu(&f->nh_list); 901 nexthop_put(rtnl_dereference(f->nh)); 902 } else { 903 list_del(&rd->list); 904 dst_cache_destroy(&rd->dst_cache); 905 kfree(rd); 906 } 907 errout: 908 kfree(f); 909 return rc; 910 } 911 912 static void __vxlan_fdb_free(struct vxlan_fdb *f) 913 { 914 struct vxlan_rdst *rd, *nd; 915 struct nexthop *nh; 916 917 nh = rcu_dereference_raw(f->nh); 918 if (nh) { 919 rcu_assign_pointer(f->nh, NULL); 920 rcu_assign_pointer(f->vdev, NULL); 921 nexthop_put(nh); 922 } 923 924 list_for_each_entry_safe(rd, nd, &f->remotes, list) { 925 dst_cache_destroy(&rd->dst_cache); 926 kfree(rd); 927 } 928 kfree(f); 929 } 930 931 static void vxlan_fdb_free(struct rcu_head *head) 932 { 933 struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu); 934 935 __vxlan_fdb_free(f); 936 } 937 938 static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 939 bool do_notify, bool swdev_notify) 940 { 941 struct vxlan_rdst *rd; 942 943 netdev_dbg(vxlan->dev, "delete %pM\n", f->key.eth_addr); 944 945 --vxlan->addrcnt; 946 if (do_notify) { 947 if (rcu_access_pointer(f->nh)) 948 vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH, 949 swdev_notify, NULL); 950 else 951 list_for_each_entry(rd, &f->remotes, list) 952 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, 953 swdev_notify, NULL); 954 } 955 956 hlist_del_init_rcu(&f->fdb_node); 957 rhashtable_remove_fast(&vxlan->fdb_hash_tbl, &f->rhnode, 958 vxlan_fdb_rht_params); 959 list_del_rcu(&f->nh_list); 960 call_rcu(&f->rcu, vxlan_fdb_free); 961 } 962 963 static void vxlan_dst_free(struct rcu_head *head) 964 { 965 struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu); 966 967 dst_cache_destroy(&rd->dst_cache); 968 kfree(rd); 969 } 970 971 static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan, 972 union vxlan_addr *ip, 973 __u16 state, __u16 flags, 974 __be16 port, __be32 vni, 975 __u32 ifindex, __u16 ndm_flags, 976 struct vxlan_fdb *f, u32 nhid, 977 bool swdev_notify, 978 struct netlink_ext_ack *extack) 979 { 980 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 981 struct vxlan_rdst *rd = NULL; 982 struct vxlan_rdst oldrd; 983 int notify = 0; 984 int rc = 0; 985 int err; 986 987 if (nhid && !rcu_access_pointer(f->nh)) { 988 NL_SET_ERR_MSG(extack, 989 "Cannot replace an existing non nexthop fdb with a nexthop"); 990 return -EOPNOTSUPP; 991 } 992 993 if (nhid && (flags & NLM_F_APPEND)) { 994 NL_SET_ERR_MSG(extack, 995 "Cannot append to a nexthop fdb"); 996 return -EOPNOTSUPP; 997 } 998 999 /* Do not allow an externally learned entry to take over an entry added 1000 * by the user. 1001 */ 1002 if (!(fdb_flags & NTF_EXT_LEARNED) || 1003 !(f->flags & NTF_VXLAN_ADDED_BY_USER)) { 1004 if (f->state != state) { 1005 f->state = state; 1006 notify = 1; 1007 } 1008 if (f->flags != fdb_flags) { 1009 f->flags = fdb_flags; 1010 notify = 1; 1011 } 1012 } 1013 1014 if ((flags & NLM_F_REPLACE)) { 1015 /* Only change unicasts */ 1016 if (!(is_multicast_ether_addr(f->key.eth_addr) || 1017 is_zero_ether_addr(f->key.eth_addr))) { 1018 if (nhid) { 1019 rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack); 1020 if (rc < 0) 1021 return rc; 1022 } else { 1023 rc = vxlan_fdb_replace(f, ip, port, vni, 1024 ifindex, &oldrd); 1025 } 1026 notify |= rc; 1027 } else { 1028 NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries"); 1029 return -EOPNOTSUPP; 1030 } 1031 } 1032 if ((flags & NLM_F_APPEND) && 1033 (is_multicast_ether_addr(f->key.eth_addr) || 1034 is_zero_ether_addr(f->key.eth_addr))) { 1035 rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd); 1036 1037 if (rc < 0) 1038 return rc; 1039 notify |= rc; 1040 } 1041 1042 if (ndm_flags & NTF_USE) 1043 WRITE_ONCE(f->updated, jiffies); 1044 1045 if (notify) { 1046 if (rd == NULL) 1047 rd = first_remote_rtnl(f); 1048 1049 WRITE_ONCE(f->updated, jiffies); 1050 err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, 1051 swdev_notify, extack); 1052 if (err) 1053 goto err_notify; 1054 } 1055 1056 return 0; 1057 1058 err_notify: 1059 if (nhid) 1060 return err; 1061 if ((flags & NLM_F_REPLACE) && rc) 1062 *rd = oldrd; 1063 else if ((flags & NLM_F_APPEND) && rc) { 1064 list_del_rcu(&rd->list); 1065 call_rcu(&rd->rcu, vxlan_dst_free); 1066 } 1067 return err; 1068 } 1069 1070 static int vxlan_fdb_update_create(struct vxlan_dev *vxlan, 1071 const u8 *mac, union vxlan_addr *ip, 1072 __u16 state, __u16 flags, 1073 __be16 port, __be32 src_vni, __be32 vni, 1074 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1075 bool swdev_notify, 1076 struct netlink_ext_ack *extack) 1077 { 1078 __u16 fdb_flags = (ndm_flags & ~NTF_USE); 1079 struct vxlan_fdb *f; 1080 int rc; 1081 1082 /* Disallow replace to add a multicast entry */ 1083 if ((flags & NLM_F_REPLACE) && 1084 (is_multicast_ether_addr(mac) || is_zero_ether_addr(mac))) 1085 return -EOPNOTSUPP; 1086 1087 netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip); 1088 rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni, 1089 vni, ifindex, fdb_flags, nhid, &f, extack); 1090 if (rc < 0) 1091 return rc; 1092 1093 rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH, 1094 swdev_notify, extack); 1095 if (rc) 1096 goto err_notify; 1097 1098 return 0; 1099 1100 err_notify: 1101 vxlan_fdb_destroy(vxlan, f, false, false); 1102 return rc; 1103 } 1104 1105 /* Add new entry to forwarding table -- assumes lock held */ 1106 int vxlan_fdb_update(struct vxlan_dev *vxlan, 1107 const u8 *mac, union vxlan_addr *ip, 1108 __u16 state, __u16 flags, 1109 __be16 port, __be32 src_vni, __be32 vni, 1110 __u32 ifindex, __u16 ndm_flags, u32 nhid, 1111 bool swdev_notify, 1112 struct netlink_ext_ack *extack) 1113 { 1114 struct vxlan_fdb *f; 1115 1116 f = vxlan_find_mac(vxlan, mac, src_vni); 1117 if (f) { 1118 if (flags & NLM_F_EXCL) { 1119 netdev_dbg(vxlan->dev, 1120 "lost race to create %pM\n", mac); 1121 return -EEXIST; 1122 } 1123 1124 return vxlan_fdb_update_existing(vxlan, ip, state, flags, port, 1125 vni, ifindex, ndm_flags, f, 1126 nhid, swdev_notify, extack); 1127 } else { 1128 if (!(flags & NLM_F_CREATE)) 1129 return -ENOENT; 1130 1131 return vxlan_fdb_update_create(vxlan, mac, ip, state, flags, 1132 port, src_vni, vni, ifindex, 1133 ndm_flags, nhid, swdev_notify, 1134 extack); 1135 } 1136 } 1137 1138 static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f, 1139 struct vxlan_rdst *rd, bool swdev_notify) 1140 { 1141 list_del_rcu(&rd->list); 1142 vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL); 1143 call_rcu(&rd->rcu, vxlan_dst_free); 1144 } 1145 1146 static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan, 1147 union vxlan_addr *ip, __be16 *port, __be32 *src_vni, 1148 __be32 *vni, u32 *ifindex, u32 *nhid, 1149 struct netlink_ext_ack *extack) 1150 { 1151 struct net *net = dev_net(vxlan->dev); 1152 int err; 1153 1154 if (tb[NDA_NH_ID] && 1155 (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] || tb[NDA_PORT])) { 1156 NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID"); 1157 return -EINVAL; 1158 } 1159 1160 if (tb[NDA_DST]) { 1161 err = vxlan_nla_get_addr(ip, tb[NDA_DST]); 1162 if (err) { 1163 NL_SET_ERR_MSG(extack, "Unsupported address family"); 1164 return err; 1165 } 1166 } else { 1167 union vxlan_addr *remote = &vxlan->default_dst.remote_ip; 1168 1169 if (remote->sa.sa_family == AF_INET) { 1170 ip->sin.sin_addr.s_addr = htonl(INADDR_ANY); 1171 ip->sa.sa_family = AF_INET; 1172 #if IS_ENABLED(CONFIG_IPV6) 1173 } else { 1174 ip->sin6.sin6_addr = in6addr_any; 1175 ip->sa.sa_family = AF_INET6; 1176 #endif 1177 } 1178 } 1179 1180 if (tb[NDA_PORT]) { 1181 if (nla_len(tb[NDA_PORT]) != sizeof(__be16)) { 1182 NL_SET_ERR_MSG(extack, "Invalid vxlan port"); 1183 return -EINVAL; 1184 } 1185 *port = nla_get_be16(tb[NDA_PORT]); 1186 } else { 1187 *port = vxlan->cfg.dst_port; 1188 } 1189 1190 if (tb[NDA_VNI]) { 1191 if (nla_len(tb[NDA_VNI]) != sizeof(u32)) { 1192 NL_SET_ERR_MSG(extack, "Invalid vni"); 1193 return -EINVAL; 1194 } 1195 *vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1196 } else { 1197 *vni = vxlan->default_dst.remote_vni; 1198 } 1199 1200 if (tb[NDA_SRC_VNI]) { 1201 if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)) { 1202 NL_SET_ERR_MSG(extack, "Invalid src vni"); 1203 return -EINVAL; 1204 } 1205 *src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 1206 } else { 1207 *src_vni = vxlan->default_dst.remote_vni; 1208 } 1209 1210 if (tb[NDA_IFINDEX]) { 1211 struct net_device *tdev; 1212 1213 if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)) { 1214 NL_SET_ERR_MSG(extack, "Invalid ifindex"); 1215 return -EINVAL; 1216 } 1217 *ifindex = nla_get_u32(tb[NDA_IFINDEX]); 1218 tdev = __dev_get_by_index(net, *ifindex); 1219 if (!tdev) { 1220 NL_SET_ERR_MSG(extack, "Device not found"); 1221 return -EADDRNOTAVAIL; 1222 } 1223 } else { 1224 *ifindex = 0; 1225 } 1226 1227 *nhid = nla_get_u32_default(tb[NDA_NH_ID], 0); 1228 1229 return 0; 1230 } 1231 1232 /* Add static entry (via netlink) */ 1233 static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], 1234 struct net_device *dev, 1235 const unsigned char *addr, u16 vid, u16 flags, 1236 bool *notified, struct netlink_ext_ack *extack) 1237 { 1238 struct vxlan_dev *vxlan = netdev_priv(dev); 1239 /* struct net *net = dev_net(vxlan->dev); */ 1240 union vxlan_addr ip; 1241 __be16 port; 1242 __be32 src_vni, vni; 1243 u32 ifindex, nhid; 1244 int err; 1245 1246 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) { 1247 pr_info("RTM_NEWNEIGH with invalid state %#x\n", 1248 ndm->ndm_state); 1249 return -EINVAL; 1250 } 1251 1252 if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID])) 1253 return -EINVAL; 1254 1255 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1256 &nhid, extack); 1257 if (err) 1258 return err; 1259 1260 if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family) 1261 return -EAFNOSUPPORT; 1262 1263 spin_lock_bh(&vxlan->hash_lock); 1264 err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags, 1265 port, src_vni, vni, ifindex, 1266 ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER, 1267 nhid, true, extack); 1268 spin_unlock_bh(&vxlan->hash_lock); 1269 1270 if (!err) 1271 *notified = true; 1272 1273 return err; 1274 } 1275 1276 int __vxlan_fdb_delete(struct vxlan_dev *vxlan, 1277 const unsigned char *addr, union vxlan_addr ip, 1278 __be16 port, __be32 src_vni, __be32 vni, 1279 u32 ifindex, bool swdev_notify) 1280 { 1281 struct vxlan_rdst *rd = NULL; 1282 struct vxlan_fdb *f; 1283 int err = -ENOENT; 1284 1285 f = vxlan_find_mac(vxlan, addr, src_vni); 1286 if (!f) 1287 return err; 1288 1289 if (!vxlan_addr_any(&ip)) { 1290 rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex); 1291 if (!rd) 1292 goto out; 1293 } 1294 1295 /* remove a destination if it's not the only one on the list, 1296 * otherwise destroy the fdb entry 1297 */ 1298 if (rd && !list_is_singular(&f->remotes)) { 1299 vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify); 1300 goto out; 1301 } 1302 1303 vxlan_fdb_destroy(vxlan, f, true, swdev_notify); 1304 1305 out: 1306 return 0; 1307 } 1308 1309 /* Delete entry (via netlink) */ 1310 static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 1311 struct net_device *dev, 1312 const unsigned char *addr, u16 vid, bool *notified, 1313 struct netlink_ext_ack *extack) 1314 { 1315 struct vxlan_dev *vxlan = netdev_priv(dev); 1316 union vxlan_addr ip; 1317 __be32 src_vni, vni; 1318 u32 ifindex, nhid; 1319 __be16 port; 1320 int err; 1321 1322 err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex, 1323 &nhid, extack); 1324 if (err) 1325 return err; 1326 1327 spin_lock_bh(&vxlan->hash_lock); 1328 err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex, 1329 true); 1330 spin_unlock_bh(&vxlan->hash_lock); 1331 1332 if (!err) 1333 *notified = true; 1334 1335 return err; 1336 } 1337 1338 /* Dump forwarding table */ 1339 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 1340 struct net_device *dev, 1341 struct net_device *filter_dev, int *idx) 1342 { 1343 struct ndo_fdb_dump_context *ctx = (void *)cb->ctx; 1344 struct vxlan_dev *vxlan = netdev_priv(dev); 1345 struct vxlan_fdb *f; 1346 int err = 0; 1347 1348 rcu_read_lock(); 1349 hlist_for_each_entry_rcu(f, &vxlan->fdb_list, fdb_node) { 1350 struct vxlan_rdst *rd; 1351 1352 if (rcu_access_pointer(f->nh)) { 1353 if (*idx < ctx->fdb_idx) 1354 goto skip_nh; 1355 err = vxlan_fdb_info(skb, vxlan, f, 1356 NETLINK_CB(cb->skb).portid, 1357 cb->nlh->nlmsg_seq, 1358 RTM_NEWNEIGH, NLM_F_MULTI, NULL); 1359 if (err < 0) { 1360 rcu_read_unlock(); 1361 goto out; 1362 } 1363 skip_nh: 1364 *idx += 1; 1365 continue; 1366 } 1367 1368 list_for_each_entry_rcu(rd, &f->remotes, list) { 1369 if (*idx < ctx->fdb_idx) 1370 goto skip; 1371 1372 err = vxlan_fdb_info(skb, vxlan, f, 1373 NETLINK_CB(cb->skb).portid, 1374 cb->nlh->nlmsg_seq, 1375 RTM_NEWNEIGH, NLM_F_MULTI, rd); 1376 if (err < 0) { 1377 rcu_read_unlock(); 1378 goto out; 1379 } 1380 skip: 1381 *idx += 1; 1382 } 1383 } 1384 rcu_read_unlock(); 1385 out: 1386 return err; 1387 } 1388 1389 static int vxlan_fdb_get(struct sk_buff *skb, 1390 struct nlattr *tb[], 1391 struct net_device *dev, 1392 const unsigned char *addr, 1393 u16 vid, u32 portid, u32 seq, 1394 struct netlink_ext_ack *extack) 1395 { 1396 struct vxlan_dev *vxlan = netdev_priv(dev); 1397 struct vxlan_fdb *f; 1398 __be32 vni; 1399 int err; 1400 1401 if (tb[NDA_VNI]) 1402 vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 1403 else 1404 vni = vxlan->default_dst.remote_vni; 1405 1406 rcu_read_lock(); 1407 1408 f = vxlan_find_mac_rcu(vxlan, addr, vni); 1409 if (!f) { 1410 NL_SET_ERR_MSG(extack, "Fdb entry not found"); 1411 err = -ENOENT; 1412 goto errout; 1413 } 1414 1415 err = vxlan_fdb_info(skb, vxlan, f, portid, seq, 1416 RTM_NEWNEIGH, 0, first_remote_rcu(f)); 1417 errout: 1418 rcu_read_unlock(); 1419 return err; 1420 } 1421 1422 /* Watch incoming packets to learn mapping between Ethernet address 1423 * and Tunnel endpoint. 1424 */ 1425 static enum skb_drop_reason vxlan_snoop(struct net_device *dev, 1426 union vxlan_addr *src_ip, 1427 const u8 *src_mac, u32 src_ifindex, 1428 __be32 vni) 1429 { 1430 struct vxlan_dev *vxlan = netdev_priv(dev); 1431 struct vxlan_fdb *f; 1432 u32 ifindex = 0; 1433 1434 /* Ignore packets from invalid src-address */ 1435 if (!is_valid_ether_addr(src_mac)) 1436 return SKB_DROP_REASON_MAC_INVALID_SOURCE; 1437 1438 #if IS_ENABLED(CONFIG_IPV6) 1439 if (src_ip->sa.sa_family == AF_INET6 && 1440 (ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL)) 1441 ifindex = src_ifindex; 1442 #endif 1443 1444 f = vxlan_find_mac_rcu(vxlan, src_mac, vni); 1445 if (likely(f)) { 1446 struct vxlan_rdst *rdst = first_remote_rcu(f); 1447 unsigned long now = jiffies; 1448 1449 if (READ_ONCE(f->updated) != now) 1450 WRITE_ONCE(f->updated, now); 1451 1452 /* Don't override an fdb with nexthop with a learnt entry */ 1453 if (rcu_access_pointer(f->nh)) 1454 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS; 1455 1456 if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) && 1457 rdst->remote_ifindex == ifindex)) 1458 return SKB_NOT_DROPPED_YET; 1459 1460 /* Don't migrate static entries, drop packets */ 1461 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 1462 return SKB_DROP_REASON_VXLAN_ENTRY_EXISTS; 1463 1464 if (net_ratelimit()) 1465 netdev_info(dev, 1466 "%pM migrated from %pIS to %pIS\n", 1467 src_mac, &rdst->remote_ip.sa, &src_ip->sa); 1468 1469 rdst->remote_ip = *src_ip; 1470 vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL); 1471 } else { 1472 /* learned new entry */ 1473 spin_lock(&vxlan->hash_lock); 1474 1475 /* close off race between vxlan_flush and incoming packets */ 1476 if (netif_running(dev)) 1477 vxlan_fdb_update(vxlan, src_mac, src_ip, 1478 NUD_REACHABLE, 1479 NLM_F_EXCL|NLM_F_CREATE, 1480 vxlan->cfg.dst_port, 1481 vni, 1482 vxlan->default_dst.remote_vni, 1483 ifindex, NTF_SELF, 0, true, NULL); 1484 spin_unlock(&vxlan->hash_lock); 1485 } 1486 1487 return SKB_NOT_DROPPED_YET; 1488 } 1489 1490 static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) 1491 { 1492 ASSERT_RTNL(); 1493 1494 if (!vs) 1495 return false; 1496 if (!refcount_dec_and_test(&vs->refcnt)) 1497 return false; 1498 1499 hlist_del_rcu(&vs->hlist); 1500 udp_tunnel_notify_del_rx_port(vs->sk, 1501 (vs->flags & VXLAN_F_GPE) ? 1502 UDP_TUNNEL_TYPE_VXLAN_GPE : 1503 UDP_TUNNEL_TYPE_VXLAN); 1504 1505 return true; 1506 } 1507 1508 static void vxlan_sock_release(struct vxlan_dev *vxlan) 1509 { 1510 struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock); 1511 #if IS_ENABLED(CONFIG_IPV6) 1512 struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock); 1513 1514 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 1515 #endif 1516 1517 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 1518 1519 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 1520 vxlan_vs_del_vnigrp(vxlan); 1521 else 1522 vxlan_vs_del_dev(vxlan); 1523 1524 if (__vxlan_sock_release_prep(sock4)) { 1525 udp_tunnel_sock_release(sock4->sk); 1526 kfree_rcu(sock4, rcu); 1527 } 1528 1529 #if IS_ENABLED(CONFIG_IPV6) 1530 if (__vxlan_sock_release_prep(sock6)) { 1531 udp_tunnel_sock_release(sock6->sk); 1532 kfree_rcu(sock6, rcu); 1533 } 1534 #endif 1535 } 1536 1537 static enum skb_drop_reason vxlan_remcsum(struct sk_buff *skb, u32 vxflags) 1538 { 1539 const struct vxlanhdr *vh = vxlan_hdr(skb); 1540 enum skb_drop_reason reason; 1541 size_t start, offset; 1542 1543 if (!(vh->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload) 1544 return SKB_NOT_DROPPED_YET; 1545 1546 start = vxlan_rco_start(vh->vx_vni); 1547 offset = start + vxlan_rco_offset(vh->vx_vni); 1548 1549 reason = pskb_may_pull_reason(skb, offset + sizeof(u16)); 1550 if (reason) 1551 return reason; 1552 1553 skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset, 1554 !!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL)); 1555 return SKB_NOT_DROPPED_YET; 1556 } 1557 1558 static void vxlan_parse_gbp_hdr(struct sk_buff *skb, u32 vxflags, 1559 struct vxlan_metadata *md) 1560 { 1561 const struct vxlanhdr *vh = vxlan_hdr(skb); 1562 const struct vxlanhdr_gbp *gbp; 1563 struct metadata_dst *tun_dst; 1564 1565 gbp = (const struct vxlanhdr_gbp *)vh; 1566 1567 if (!(vh->vx_flags & VXLAN_HF_GBP)) 1568 return; 1569 1570 md->gbp = ntohs(gbp->policy_id); 1571 1572 tun_dst = (struct metadata_dst *)skb_dst(skb); 1573 if (tun_dst) { 1574 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, 1575 tun_dst->u.tun_info.key.tun_flags); 1576 tun_dst->u.tun_info.options_len = sizeof(*md); 1577 } 1578 if (gbp->dont_learn) 1579 md->gbp |= VXLAN_GBP_DONT_LEARN; 1580 1581 if (gbp->policy_applied) 1582 md->gbp |= VXLAN_GBP_POLICY_APPLIED; 1583 1584 /* In flow-based mode, GBP is carried in dst_metadata */ 1585 if (!(vxflags & VXLAN_F_COLLECT_METADATA)) 1586 skb->mark = md->gbp; 1587 } 1588 1589 static enum skb_drop_reason vxlan_set_mac(struct vxlan_dev *vxlan, 1590 struct vxlan_sock *vs, 1591 struct sk_buff *skb, __be32 vni) 1592 { 1593 union vxlan_addr saddr; 1594 u32 ifindex = skb->dev->ifindex; 1595 1596 skb_reset_mac_header(skb); 1597 skb->protocol = eth_type_trans(skb, vxlan->dev); 1598 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 1599 1600 /* Ignore packet loops (and multicast echo) */ 1601 if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr)) 1602 return SKB_DROP_REASON_LOCAL_MAC; 1603 1604 /* Get address from the outer IP header */ 1605 if (vxlan_get_sk_family(vs) == AF_INET) { 1606 saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; 1607 saddr.sa.sa_family = AF_INET; 1608 #if IS_ENABLED(CONFIG_IPV6) 1609 } else { 1610 saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr; 1611 saddr.sa.sa_family = AF_INET6; 1612 #endif 1613 } 1614 1615 if (!(vxlan->cfg.flags & VXLAN_F_LEARN)) 1616 return SKB_NOT_DROPPED_YET; 1617 1618 return vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, 1619 ifindex, vni); 1620 } 1621 1622 static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph, 1623 struct sk_buff *skb) 1624 { 1625 int err = 0; 1626 1627 if (vxlan_get_sk_family(vs) == AF_INET) 1628 err = IP_ECN_decapsulate(oiph, skb); 1629 #if IS_ENABLED(CONFIG_IPV6) 1630 else 1631 err = IP6_ECN_decapsulate(oiph, skb); 1632 #endif 1633 1634 if (unlikely(err) && log_ecn_error) { 1635 if (vxlan_get_sk_family(vs) == AF_INET) 1636 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 1637 &((struct iphdr *)oiph)->saddr, 1638 ((struct iphdr *)oiph)->tos); 1639 else 1640 net_info_ratelimited("non-ECT from %pI6\n", 1641 &((struct ipv6hdr *)oiph)->saddr); 1642 } 1643 return err <= 1; 1644 } 1645 1646 static int vxlan_rcv(struct sock *sk, struct sk_buff *skb) 1647 { 1648 struct vxlan_vni_node *vninode = NULL; 1649 const struct vxlanhdr *vh; 1650 struct vxlan_dev *vxlan; 1651 struct vxlan_sock *vs; 1652 struct vxlan_metadata _md; 1653 struct vxlan_metadata *md = &_md; 1654 __be16 protocol = htons(ETH_P_TEB); 1655 enum skb_drop_reason reason; 1656 bool raw_proto = false; 1657 void *oiph; 1658 __be32 vni = 0; 1659 int nh; 1660 1661 /* Need UDP and VXLAN header to be present */ 1662 reason = pskb_may_pull_reason(skb, VXLAN_HLEN); 1663 if (reason) 1664 goto drop; 1665 1666 vh = vxlan_hdr(skb); 1667 /* VNI flag always required to be set */ 1668 if (!(vh->vx_flags & VXLAN_HF_VNI)) { 1669 netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n", 1670 ntohl(vh->vx_flags), ntohl(vh->vx_vni)); 1671 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR; 1672 /* Return non vxlan pkt */ 1673 goto drop; 1674 } 1675 1676 vs = rcu_dereference_sk_user_data(sk); 1677 if (!vs) 1678 goto drop; 1679 1680 vni = vxlan_vni(vh->vx_vni); 1681 1682 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, &vninode); 1683 if (!vxlan) { 1684 reason = SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND; 1685 goto drop; 1686 } 1687 1688 if (vh->vx_flags & vxlan->cfg.reserved_bits.vx_flags || 1689 vh->vx_vni & vxlan->cfg.reserved_bits.vx_vni) { 1690 /* If the header uses bits besides those enabled by the 1691 * netdevice configuration, treat this as a malformed packet. 1692 * This behavior diverges from VXLAN RFC (RFC7348) which 1693 * stipulates that bits in reserved in reserved fields are to be 1694 * ignored. The approach here maintains compatibility with 1695 * previous stack code, and also is more robust and provides a 1696 * little more security in adding extensions to VXLAN. 1697 */ 1698 reason = SKB_DROP_REASON_VXLAN_INVALID_HDR; 1699 DEV_STATS_INC(vxlan->dev, rx_frame_errors); 1700 DEV_STATS_INC(vxlan->dev, rx_errors); 1701 vxlan_vnifilter_count(vxlan, vni, vninode, 1702 VXLAN_VNI_STATS_RX_ERRORS, 0); 1703 goto drop; 1704 } 1705 1706 if (vxlan->cfg.flags & VXLAN_F_GPE) { 1707 if (!vxlan_parse_gpe_proto(vh, &protocol)) 1708 goto drop; 1709 raw_proto = true; 1710 } 1711 1712 if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto, 1713 !net_eq(vxlan->net, dev_net(vxlan->dev)))) { 1714 reason = SKB_DROP_REASON_NOMEM; 1715 goto drop; 1716 } 1717 1718 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_RX) { 1719 reason = vxlan_remcsum(skb, vxlan->cfg.flags); 1720 if (unlikely(reason)) 1721 goto drop; 1722 } 1723 1724 if (vxlan_collect_metadata(vs)) { 1725 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 1726 struct metadata_dst *tun_dst; 1727 1728 __set_bit(IP_TUNNEL_KEY_BIT, flags); 1729 tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), flags, 1730 key32_to_tunnel_id(vni), sizeof(*md)); 1731 1732 if (!tun_dst) { 1733 reason = SKB_DROP_REASON_NOMEM; 1734 goto drop; 1735 } 1736 1737 md = ip_tunnel_info_opts(&tun_dst->u.tun_info); 1738 1739 skb_dst_set(skb, (struct dst_entry *)tun_dst); 1740 } else { 1741 memset(md, 0, sizeof(*md)); 1742 } 1743 1744 if (vxlan->cfg.flags & VXLAN_F_GBP) 1745 vxlan_parse_gbp_hdr(skb, vxlan->cfg.flags, md); 1746 /* Note that GBP and GPE can never be active together. This is 1747 * ensured in vxlan_dev_configure. 1748 */ 1749 1750 if (!raw_proto) { 1751 reason = vxlan_set_mac(vxlan, vs, skb, vni); 1752 if (reason) 1753 goto drop; 1754 } else { 1755 skb_reset_mac_header(skb); 1756 skb->dev = vxlan->dev; 1757 skb->pkt_type = PACKET_HOST; 1758 } 1759 1760 /* Save offset of outer header relative to skb->head, 1761 * because we are going to reset the network header to the inner header 1762 * and might change skb->head. 1763 */ 1764 nh = skb_network_header(skb) - skb->head; 1765 1766 skb_reset_network_header(skb); 1767 1768 reason = pskb_inet_may_pull_reason(skb); 1769 if (reason) { 1770 DEV_STATS_INC(vxlan->dev, rx_length_errors); 1771 DEV_STATS_INC(vxlan->dev, rx_errors); 1772 vxlan_vnifilter_count(vxlan, vni, vninode, 1773 VXLAN_VNI_STATS_RX_ERRORS, 0); 1774 goto drop; 1775 } 1776 1777 /* Get the outer header. */ 1778 oiph = skb->head + nh; 1779 1780 if (!vxlan_ecn_decapsulate(vs, oiph, skb)) { 1781 reason = SKB_DROP_REASON_IP_TUNNEL_ECN; 1782 DEV_STATS_INC(vxlan->dev, rx_frame_errors); 1783 DEV_STATS_INC(vxlan->dev, rx_errors); 1784 vxlan_vnifilter_count(vxlan, vni, vninode, 1785 VXLAN_VNI_STATS_RX_ERRORS, 0); 1786 goto drop; 1787 } 1788 1789 rcu_read_lock(); 1790 1791 if (unlikely(!(vxlan->dev->flags & IFF_UP))) { 1792 rcu_read_unlock(); 1793 dev_dstats_rx_dropped(vxlan->dev); 1794 vxlan_vnifilter_count(vxlan, vni, vninode, 1795 VXLAN_VNI_STATS_RX_DROPS, 0); 1796 reason = SKB_DROP_REASON_DEV_READY; 1797 goto drop; 1798 } 1799 1800 dev_dstats_rx_add(vxlan->dev, skb->len); 1801 vxlan_vnifilter_count(vxlan, vni, vninode, VXLAN_VNI_STATS_RX, skb->len); 1802 gro_cells_receive(&vxlan->gro_cells, skb); 1803 1804 rcu_read_unlock(); 1805 1806 return 0; 1807 1808 drop: 1809 reason = reason ?: SKB_DROP_REASON_NOT_SPECIFIED; 1810 /* Consume bad packet */ 1811 kfree_skb_reason(skb, reason); 1812 return 0; 1813 } 1814 1815 static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb) 1816 { 1817 struct vxlan_dev *vxlan; 1818 struct vxlan_sock *vs; 1819 struct vxlanhdr *hdr; 1820 __be32 vni; 1821 1822 if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN)) 1823 return -EINVAL; 1824 1825 hdr = vxlan_hdr(skb); 1826 1827 if (!(hdr->vx_flags & VXLAN_HF_VNI)) 1828 return -EINVAL; 1829 1830 vs = rcu_dereference_sk_user_data(sk); 1831 if (!vs) 1832 return -ENOENT; 1833 1834 vni = vxlan_vni(hdr->vx_vni); 1835 vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni, NULL); 1836 if (!vxlan) 1837 return -ENOENT; 1838 1839 return 0; 1840 } 1841 1842 static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 1843 { 1844 struct vxlan_dev *vxlan = netdev_priv(dev); 1845 struct arphdr *parp; 1846 u8 *arpptr, *sha; 1847 __be32 sip, tip; 1848 struct neighbour *n; 1849 1850 if (dev->flags & IFF_NOARP) 1851 goto out; 1852 1853 if (!pskb_network_may_pull(skb, arp_hdr_len(dev))) { 1854 dev_dstats_tx_dropped(dev); 1855 vxlan_vnifilter_count(vxlan, vni, NULL, 1856 VXLAN_VNI_STATS_TX_DROPS, 0); 1857 goto out; 1858 } 1859 parp = arp_hdr(skb); 1860 1861 if ((parp->ar_hrd != htons(ARPHRD_ETHER) && 1862 parp->ar_hrd != htons(ARPHRD_IEEE802)) || 1863 parp->ar_pro != htons(ETH_P_IP) || 1864 parp->ar_op != htons(ARPOP_REQUEST) || 1865 parp->ar_hln != dev->addr_len || 1866 parp->ar_pln != 4) 1867 goto out; 1868 arpptr = (u8 *)parp + sizeof(struct arphdr); 1869 sha = arpptr; 1870 arpptr += dev->addr_len; /* sha */ 1871 memcpy(&sip, arpptr, sizeof(sip)); 1872 arpptr += sizeof(sip); 1873 arpptr += dev->addr_len; /* tha */ 1874 memcpy(&tip, arpptr, sizeof(tip)); 1875 1876 if (ipv4_is_loopback(tip) || 1877 ipv4_is_multicast(tip)) 1878 goto out; 1879 1880 n = neigh_lookup(&arp_tbl, &tip, dev); 1881 1882 if (n) { 1883 struct vxlan_rdst *rdst = NULL; 1884 struct vxlan_fdb *f; 1885 struct sk_buff *reply; 1886 1887 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 1888 neigh_release(n); 1889 goto out; 1890 } 1891 1892 rcu_read_lock(); 1893 f = vxlan_find_mac_tx(vxlan, n->ha, vni); 1894 if (f) 1895 rdst = first_remote_rcu(f); 1896 if (rdst && vxlan_addr_any(&rdst->remote_ip)) { 1897 /* bridge-local neighbor */ 1898 neigh_release(n); 1899 rcu_read_unlock(); 1900 goto out; 1901 } 1902 rcu_read_unlock(); 1903 1904 reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, 1905 n->ha, sha); 1906 1907 neigh_release(n); 1908 1909 if (reply == NULL) 1910 goto out; 1911 1912 skb_reset_mac_header(reply); 1913 __skb_pull(reply, skb_network_offset(reply)); 1914 reply->ip_summed = CHECKSUM_UNNECESSARY; 1915 reply->pkt_type = PACKET_HOST; 1916 1917 if (netif_rx(reply) == NET_RX_DROP) { 1918 dev_dstats_rx_dropped(dev); 1919 vxlan_vnifilter_count(vxlan, vni, NULL, 1920 VXLAN_VNI_STATS_RX_DROPS, 0); 1921 } 1922 1923 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 1924 union vxlan_addr ipa = { 1925 .sin.sin_addr.s_addr = tip, 1926 .sin.sin_family = AF_INET, 1927 }; 1928 1929 vxlan_ip_miss(dev, &ipa); 1930 } 1931 out: 1932 consume_skb(skb); 1933 return NETDEV_TX_OK; 1934 } 1935 1936 #if IS_ENABLED(CONFIG_IPV6) 1937 static struct sk_buff *vxlan_na_create(struct sk_buff *request, 1938 struct neighbour *n, bool isrouter) 1939 { 1940 struct net_device *dev = request->dev; 1941 struct sk_buff *reply; 1942 struct nd_msg *ns, *na; 1943 struct ipv6hdr *pip6; 1944 u8 *daddr; 1945 int na_olen = 8; /* opt hdr + ETH_ALEN for target */ 1946 int ns_olen; 1947 int i, len; 1948 1949 if (dev == NULL || !pskb_may_pull(request, request->len)) 1950 return NULL; 1951 1952 len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) + 1953 sizeof(*na) + na_olen + dev->needed_tailroom; 1954 reply = alloc_skb(len, GFP_ATOMIC); 1955 if (reply == NULL) 1956 return NULL; 1957 1958 reply->protocol = htons(ETH_P_IPV6); 1959 reply->dev = dev; 1960 skb_reserve(reply, LL_RESERVED_SPACE(request->dev)); 1961 skb_push(reply, sizeof(struct ethhdr)); 1962 skb_reset_mac_header(reply); 1963 1964 ns = (struct nd_msg *)(ipv6_hdr(request) + 1); 1965 1966 daddr = eth_hdr(request)->h_source; 1967 ns_olen = request->len - skb_network_offset(request) - 1968 sizeof(struct ipv6hdr) - sizeof(*ns); 1969 for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) { 1970 if (!ns->opt[i + 1] || i + (ns->opt[i + 1] << 3) > ns_olen) { 1971 kfree_skb(reply); 1972 return NULL; 1973 } 1974 if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) { 1975 if ((ns->opt[i + 1] << 3) >= 1976 sizeof(struct nd_opt_hdr) + ETH_ALEN) 1977 daddr = ns->opt + i + sizeof(struct nd_opt_hdr); 1978 break; 1979 } 1980 } 1981 1982 /* Ethernet header */ 1983 ether_addr_copy(eth_hdr(reply)->h_dest, daddr); 1984 ether_addr_copy(eth_hdr(reply)->h_source, n->ha); 1985 eth_hdr(reply)->h_proto = htons(ETH_P_IPV6); 1986 reply->protocol = htons(ETH_P_IPV6); 1987 1988 skb_pull(reply, sizeof(struct ethhdr)); 1989 skb_reset_network_header(reply); 1990 skb_put(reply, sizeof(struct ipv6hdr)); 1991 1992 /* IPv6 header */ 1993 1994 pip6 = ipv6_hdr(reply); 1995 memset(pip6, 0, sizeof(struct ipv6hdr)); 1996 pip6->version = 6; 1997 pip6->priority = ipv6_hdr(request)->priority; 1998 pip6->nexthdr = IPPROTO_ICMPV6; 1999 pip6->hop_limit = 255; 2000 pip6->daddr = ipv6_hdr(request)->saddr; 2001 pip6->saddr = *(struct in6_addr *)n->primary_key; 2002 2003 skb_pull(reply, sizeof(struct ipv6hdr)); 2004 skb_reset_transport_header(reply); 2005 2006 /* Neighbor Advertisement */ 2007 na = skb_put_zero(reply, sizeof(*na) + na_olen); 2008 na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; 2009 na->icmph.icmp6_router = isrouter; 2010 na->icmph.icmp6_override = 1; 2011 na->icmph.icmp6_solicited = 1; 2012 na->target = ns->target; 2013 ether_addr_copy(&na->opt[2], n->ha); 2014 na->opt[0] = ND_OPT_TARGET_LL_ADDR; 2015 na->opt[1] = na_olen >> 3; 2016 2017 na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr, 2018 &pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6, 2019 csum_partial(na, sizeof(*na)+na_olen, 0)); 2020 2021 pip6->payload_len = htons(sizeof(*na)+na_olen); 2022 2023 skb_push(reply, sizeof(struct ipv6hdr)); 2024 2025 reply->ip_summed = CHECKSUM_UNNECESSARY; 2026 2027 return reply; 2028 } 2029 2030 static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni) 2031 { 2032 struct vxlan_dev *vxlan = netdev_priv(dev); 2033 const struct in6_addr *daddr; 2034 const struct ipv6hdr *iphdr; 2035 struct neighbour *n; 2036 struct nd_msg *msg; 2037 2038 rcu_read_lock(); 2039 if (unlikely(!ipv6_mod_enabled())) 2040 goto out; 2041 2042 iphdr = ipv6_hdr(skb); 2043 daddr = &iphdr->daddr; 2044 msg = (struct nd_msg *)(iphdr + 1); 2045 2046 if (ipv6_addr_loopback(daddr) || 2047 ipv6_addr_is_multicast(&msg->target)) 2048 goto out; 2049 2050 n = neigh_lookup(&nd_tbl, &msg->target, dev); 2051 2052 if (n) { 2053 struct vxlan_rdst *rdst = NULL; 2054 struct vxlan_fdb *f; 2055 struct sk_buff *reply; 2056 2057 if (!(READ_ONCE(n->nud_state) & NUD_CONNECTED)) { 2058 neigh_release(n); 2059 goto out; 2060 } 2061 2062 f = vxlan_find_mac_tx(vxlan, n->ha, vni); 2063 if (f) 2064 rdst = first_remote_rcu(f); 2065 if (rdst && vxlan_addr_any(&rdst->remote_ip)) { 2066 /* bridge-local neighbor */ 2067 neigh_release(n); 2068 goto out; 2069 } 2070 2071 reply = vxlan_na_create(skb, n, 2072 !!(f ? f->flags & NTF_ROUTER : 0)); 2073 2074 neigh_release(n); 2075 2076 if (reply == NULL) 2077 goto out; 2078 2079 if (netif_rx(reply) == NET_RX_DROP) { 2080 dev_dstats_rx_dropped(dev); 2081 vxlan_vnifilter_count(vxlan, vni, NULL, 2082 VXLAN_VNI_STATS_RX_DROPS, 0); 2083 } 2084 } else if (vxlan->cfg.flags & VXLAN_F_L3MISS) { 2085 union vxlan_addr ipa = { 2086 .sin6.sin6_addr = msg->target, 2087 .sin6.sin6_family = AF_INET6, 2088 }; 2089 2090 vxlan_ip_miss(dev, &ipa); 2091 } 2092 2093 out: 2094 rcu_read_unlock(); 2095 consume_skb(skb); 2096 return NETDEV_TX_OK; 2097 } 2098 #endif 2099 2100 static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb) 2101 { 2102 struct vxlan_dev *vxlan = netdev_priv(dev); 2103 struct neighbour *n; 2104 2105 if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) 2106 return false; 2107 2108 n = NULL; 2109 switch (ntohs(eth_hdr(skb)->h_proto)) { 2110 case ETH_P_IP: 2111 { 2112 struct iphdr *pip; 2113 2114 if (!pskb_network_may_pull(skb, sizeof(struct iphdr))) 2115 return false; 2116 pip = ip_hdr(skb); 2117 n = neigh_lookup(&arp_tbl, &pip->daddr, dev); 2118 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2119 union vxlan_addr ipa = { 2120 .sin.sin_addr.s_addr = pip->daddr, 2121 .sin.sin_family = AF_INET, 2122 }; 2123 2124 vxlan_ip_miss(dev, &ipa); 2125 return false; 2126 } 2127 2128 break; 2129 } 2130 #if IS_ENABLED(CONFIG_IPV6) 2131 case ETH_P_IPV6: 2132 { 2133 struct ipv6hdr *pip6; 2134 2135 /* check if ipv6.disable=1 set during boot was set 2136 * during booting so nd_tbl is not initialized 2137 */ 2138 if (!ipv6_mod_enabled()) 2139 return false; 2140 if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr))) 2141 return false; 2142 pip6 = ipv6_hdr(skb); 2143 n = neigh_lookup(&nd_tbl, &pip6->daddr, dev); 2144 if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) { 2145 union vxlan_addr ipa = { 2146 .sin6.sin6_addr = pip6->daddr, 2147 .sin6.sin6_family = AF_INET6, 2148 }; 2149 2150 vxlan_ip_miss(dev, &ipa); 2151 return false; 2152 } 2153 2154 break; 2155 } 2156 #endif 2157 default: 2158 return false; 2159 } 2160 2161 if (n) { 2162 u8 haddr[ETH_ALEN]; 2163 bool diff; 2164 2165 neigh_ha_snapshot(haddr, n, dev); 2166 diff = !ether_addr_equal_unaligned(eth_hdr(skb)->h_dest, haddr); 2167 if (diff) { 2168 if (skb_cow_head(skb, 0)) { 2169 neigh_release(n); 2170 return false; 2171 } 2172 memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest, 2173 dev->addr_len); 2174 memcpy(eth_hdr(skb)->h_dest, haddr, dev->addr_len); 2175 } 2176 neigh_release(n); 2177 return diff; 2178 } 2179 2180 return false; 2181 } 2182 2183 static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 protocol) 2184 { 2185 struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh; 2186 2187 gpe->np_applied = 1; 2188 gpe->next_protocol = tun_p_from_eth_p(protocol); 2189 if (!gpe->next_protocol) 2190 return -EPFNOSUPPORT; 2191 return 0; 2192 } 2193 2194 static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst, 2195 int iphdr_len, __be32 vni, 2196 struct vxlan_metadata *md, u32 vxflags, 2197 bool udp_sum) 2198 { 2199 int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; 2200 __be16 inner_protocol = htons(ETH_P_TEB); 2201 struct vxlanhdr *vxh; 2202 bool double_encap; 2203 int min_headroom; 2204 int err; 2205 2206 if ((vxflags & VXLAN_F_REMCSUM_TX) && 2207 skb->ip_summed == CHECKSUM_PARTIAL) { 2208 int csum_start = skb_checksum_start_offset(skb); 2209 2210 if (csum_start <= VXLAN_MAX_REMCSUM_START && 2211 !(csum_start & VXLAN_RCO_SHIFT_MASK) && 2212 (skb->csum_offset == offsetof(struct udphdr, check) || 2213 skb->csum_offset == offsetof(struct tcphdr, check))) 2214 type |= SKB_GSO_TUNNEL_REMCSUM; 2215 } 2216 2217 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 2218 + VXLAN_HLEN + iphdr_len; 2219 2220 /* Need space for new headers (invalidates iph ptr) */ 2221 err = skb_cow_head(skb, min_headroom); 2222 if (unlikely(err)) 2223 return err; 2224 2225 double_encap = udp_tunnel_handle_partial(skb); 2226 err = iptunnel_handle_offloads(skb, type); 2227 if (err) 2228 return err; 2229 2230 vxh = __skb_push(skb, sizeof(*vxh)); 2231 vxh->vx_flags = VXLAN_HF_VNI; 2232 vxh->vx_vni = vxlan_vni_field(vni); 2233 2234 if (type & SKB_GSO_TUNNEL_REMCSUM) { 2235 unsigned int start; 2236 2237 start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr); 2238 vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset); 2239 vxh->vx_flags |= VXLAN_HF_RCO; 2240 2241 if (!skb_is_gso(skb)) { 2242 skb->ip_summed = CHECKSUM_NONE; 2243 skb->encapsulation = 0; 2244 } 2245 } 2246 2247 if (vxflags & VXLAN_F_GBP) 2248 vxlan_build_gbp_hdr(vxh, md); 2249 if (vxflags & VXLAN_F_GPE) { 2250 err = vxlan_build_gpe_hdr(vxh, skb->protocol); 2251 if (err < 0) 2252 return err; 2253 inner_protocol = skb->protocol; 2254 } 2255 2256 udp_tunnel_set_inner_protocol(skb, double_encap, inner_protocol); 2257 return 0; 2258 } 2259 2260 /* Bypass encapsulation if the destination is local */ 2261 static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan, 2262 struct vxlan_dev *dst_vxlan, __be32 vni, 2263 bool snoop) 2264 { 2265 union vxlan_addr loopback; 2266 union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip; 2267 unsigned int len = skb->len; 2268 struct net_device *dev; 2269 2270 skb->pkt_type = PACKET_HOST; 2271 skb->encapsulation = 0; 2272 skb->dev = dst_vxlan->dev; 2273 __skb_pull(skb, skb_network_offset(skb)); 2274 2275 if (remote_ip->sa.sa_family == AF_INET) { 2276 loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 2277 loopback.sa.sa_family = AF_INET; 2278 #if IS_ENABLED(CONFIG_IPV6) 2279 } else { 2280 loopback.sin6.sin6_addr = in6addr_loopback; 2281 loopback.sa.sa_family = AF_INET6; 2282 #endif 2283 } 2284 2285 rcu_read_lock(); 2286 dev = skb->dev; 2287 if (unlikely(!(dev->flags & IFF_UP))) { 2288 kfree_skb_reason(skb, SKB_DROP_REASON_DEV_READY); 2289 goto drop; 2290 } 2291 2292 if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop) 2293 vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni); 2294 2295 dev_dstats_tx_add(src_vxlan->dev, len); 2296 vxlan_vnifilter_count(src_vxlan, vni, NULL, VXLAN_VNI_STATS_TX, len); 2297 2298 if (__netif_rx(skb) == NET_RX_SUCCESS) { 2299 dev_dstats_rx_add(dst_vxlan->dev, len); 2300 vxlan_vnifilter_count(dst_vxlan, vni, NULL, VXLAN_VNI_STATS_RX, 2301 len); 2302 } else { 2303 drop: 2304 dev_dstats_rx_dropped(dev); 2305 vxlan_vnifilter_count(dst_vxlan, vni, NULL, 2306 VXLAN_VNI_STATS_RX_DROPS, 0); 2307 } 2308 rcu_read_unlock(); 2309 } 2310 2311 static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev, 2312 struct vxlan_dev *vxlan, 2313 int addr_family, 2314 __be16 dst_port, int dst_ifindex, __be32 vni, 2315 struct dst_entry *dst, 2316 u32 rt_flags) 2317 { 2318 #if IS_ENABLED(CONFIG_IPV6) 2319 /* IPv6 rt-flags are checked against RTF_LOCAL, but the value of 2320 * RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple 2321 * we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry. 2322 */ 2323 BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL); 2324 #endif 2325 /* Bypass encapsulation if the destination is local */ 2326 if (rt_flags & RTCF_LOCAL && 2327 !(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) && 2328 vxlan->cfg.flags & VXLAN_F_LOCALBYPASS) { 2329 struct vxlan_dev *dst_vxlan; 2330 2331 dst_release(dst); 2332 dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni, 2333 addr_family, dst_port, 2334 vxlan->cfg.flags); 2335 if (!dst_vxlan) { 2336 DEV_STATS_INC(dev, tx_errors); 2337 vxlan_vnifilter_count(vxlan, vni, NULL, 2338 VXLAN_VNI_STATS_TX_ERRORS, 0); 2339 kfree_skb_reason(skb, SKB_DROP_REASON_VXLAN_VNI_NOT_FOUND); 2340 2341 return -ENOENT; 2342 } 2343 vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true); 2344 return 1; 2345 } 2346 2347 return 0; 2348 } 2349 2350 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 2351 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc) 2352 { 2353 struct dst_cache *dst_cache; 2354 struct ip_tunnel_info *info; 2355 struct ip_tunnel_key *pkey; 2356 struct ip_tunnel_key key; 2357 struct vxlan_dev *vxlan = netdev_priv(dev); 2358 const struct iphdr *old_iph; 2359 struct vxlan_metadata _md; 2360 struct vxlan_metadata *md = &_md; 2361 unsigned int pkt_len = skb->len; 2362 __be16 src_port = 0, dst_port; 2363 struct dst_entry *ndst = NULL; 2364 int addr_family; 2365 __u8 tos, ttl; 2366 int ifindex; 2367 int err = 0; 2368 u32 flags = vxlan->cfg.flags; 2369 bool use_cache; 2370 bool udp_sum = false; 2371 bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev)); 2372 enum skb_drop_reason reason; 2373 bool no_eth_encap; 2374 __be32 vni = 0; 2375 2376 no_eth_encap = flags & VXLAN_F_GPE && skb->protocol != htons(ETH_P_TEB); 2377 reason = skb_vlan_inet_prepare(skb, no_eth_encap); 2378 if (reason) 2379 goto drop; 2380 2381 reason = SKB_DROP_REASON_NOT_SPECIFIED; 2382 old_iph = ip_hdr(skb); 2383 2384 info = skb_tunnel_info(skb); 2385 use_cache = ip_tunnel_dst_cache_usable(skb, info); 2386 2387 if (rdst) { 2388 memset(&key, 0, sizeof(key)); 2389 pkey = &key; 2390 2391 if (vxlan_addr_any(&rdst->remote_ip)) { 2392 if (did_rsc) { 2393 /* short-circuited back to local bridge */ 2394 vxlan_encap_bypass(skb, vxlan, vxlan, 2395 default_vni, true); 2396 return; 2397 } 2398 goto drop; 2399 } 2400 2401 addr_family = vxlan->cfg.saddr.sa.sa_family; 2402 dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port; 2403 vni = (rdst->remote_vni) ? : default_vni; 2404 ifindex = rdst->remote_ifindex; 2405 2406 if (addr_family == AF_INET) { 2407 key.u.ipv4.src = vxlan->cfg.saddr.sin.sin_addr.s_addr; 2408 key.u.ipv4.dst = rdst->remote_ip.sin.sin_addr.s_addr; 2409 } else { 2410 key.u.ipv6.src = vxlan->cfg.saddr.sin6.sin6_addr; 2411 key.u.ipv6.dst = rdst->remote_ip.sin6.sin6_addr; 2412 } 2413 2414 dst_cache = &rdst->dst_cache; 2415 md->gbp = skb->mark; 2416 if (flags & VXLAN_F_TTL_INHERIT) { 2417 ttl = ip_tunnel_get_ttl(old_iph, skb); 2418 } else { 2419 ttl = vxlan->cfg.ttl; 2420 if (!ttl && vxlan_addr_multicast(&rdst->remote_ip)) 2421 ttl = 1; 2422 } 2423 tos = vxlan->cfg.tos; 2424 if (tos == 1) 2425 tos = ip_tunnel_get_dsfield(old_iph, skb); 2426 if (tos && !info) 2427 use_cache = false; 2428 2429 if (addr_family == AF_INET) 2430 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX); 2431 else 2432 udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX); 2433 #if IS_ENABLED(CONFIG_IPV6) 2434 switch (vxlan->cfg.label_policy) { 2435 case VXLAN_LABEL_FIXED: 2436 key.label = vxlan->cfg.label; 2437 break; 2438 case VXLAN_LABEL_INHERIT: 2439 key.label = ip_tunnel_get_flowlabel(old_iph, skb); 2440 break; 2441 default: 2442 DEBUG_NET_WARN_ON_ONCE(1); 2443 goto drop; 2444 } 2445 #endif 2446 } else { 2447 if (!info) { 2448 WARN_ONCE(1, "%s: Missing encapsulation instructions\n", 2449 dev->name); 2450 goto drop; 2451 } 2452 pkey = &info->key; 2453 addr_family = ip_tunnel_info_af(info); 2454 dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port; 2455 vni = tunnel_id_to_key32(info->key.tun_id); 2456 ifindex = 0; 2457 dst_cache = &info->dst_cache; 2458 if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) { 2459 if (info->options_len < sizeof(*md)) 2460 goto drop; 2461 md = ip_tunnel_info_opts(info); 2462 } 2463 ttl = info->key.ttl; 2464 tos = info->key.tos; 2465 udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 2466 } 2467 src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 2468 vxlan->cfg.port_max, true); 2469 2470 rcu_read_lock(); 2471 if (addr_family == AF_INET) { 2472 struct vxlan_sock *sock4; 2473 u16 ipcb_flags = 0; 2474 struct rtable *rt; 2475 __be16 df = 0; 2476 __be32 saddr; 2477 2478 sock4 = rcu_dereference(vxlan->vn4_sock); 2479 if (unlikely(!sock4)) { 2480 reason = SKB_DROP_REASON_DEV_READY; 2481 goto tx_error; 2482 } 2483 2484 if (!ifindex) 2485 ifindex = sock4->sk->sk_bound_dev_if; 2486 2487 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, ifindex, 2488 &saddr, pkey, src_port, dst_port, 2489 tos, use_cache ? dst_cache : NULL); 2490 if (IS_ERR(rt)) { 2491 err = PTR_ERR(rt); 2492 reason = SKB_DROP_REASON_IP_OUTNOROUTES; 2493 goto tx_error; 2494 } 2495 2496 if (flags & VXLAN_F_MC_ROUTE) 2497 ipcb_flags |= IPSKB_MCROUTE; 2498 2499 if (!info) { 2500 /* Bypass encapsulation if the destination is local */ 2501 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET, 2502 dst_port, ifindex, vni, 2503 &rt->dst, rt->rt_flags); 2504 if (err) 2505 goto out_unlock; 2506 2507 if (vxlan->cfg.df == VXLAN_DF_SET) { 2508 df = htons(IP_DF); 2509 } else if (vxlan->cfg.df == VXLAN_DF_INHERIT) { 2510 struct ethhdr *eth = eth_hdr(skb); 2511 2512 if (ntohs(eth->h_proto) == ETH_P_IPV6 || 2513 (ntohs(eth->h_proto) == ETH_P_IP && 2514 old_iph->frag_off & htons(IP_DF))) 2515 df = htons(IP_DF); 2516 } 2517 } else if (test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, 2518 info->key.tun_flags)) { 2519 df = htons(IP_DF); 2520 } 2521 2522 ndst = &rt->dst; 2523 err = skb_tunnel_check_pmtu(skb, ndst, vxlan_headroom(flags & VXLAN_F_GPE), 2524 netif_is_any_bridge_port(dev)); 2525 if (err < 0) { 2526 goto tx_error; 2527 } else if (err) { 2528 if (info) { 2529 struct ip_tunnel_info *unclone; 2530 2531 unclone = skb_tunnel_info_unclone(skb); 2532 if (unlikely(!unclone)) 2533 goto tx_error; 2534 2535 unclone->key.u.ipv4.src = pkey->u.ipv4.dst; 2536 unclone->key.u.ipv4.dst = saddr; 2537 } 2538 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2539 dst_release(ndst); 2540 goto out_unlock; 2541 } 2542 2543 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb); 2544 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 2545 err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr), 2546 vni, md, flags, udp_sum); 2547 if (err < 0) { 2548 reason = SKB_DROP_REASON_NOMEM; 2549 goto tx_error; 2550 } 2551 2552 udp_tunnel_xmit_skb(rt, sock4->sk, skb, saddr, 2553 pkey->u.ipv4.dst, tos, ttl, df, 2554 src_port, dst_port, xnet, !udp_sum, 2555 ipcb_flags); 2556 #if IS_ENABLED(CONFIG_IPV6) 2557 } else { 2558 struct vxlan_sock *sock6; 2559 struct in6_addr saddr; 2560 u16 ip6cb_flags = 0; 2561 2562 sock6 = rcu_dereference(vxlan->vn6_sock); 2563 if (unlikely(!sock6)) { 2564 reason = SKB_DROP_REASON_DEV_READY; 2565 goto tx_error; 2566 } 2567 2568 if (!ifindex) 2569 ifindex = sock6->sk->sk_bound_dev_if; 2570 2571 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sk, 2572 ifindex, &saddr, pkey, 2573 src_port, dst_port, tos, 2574 use_cache ? dst_cache : NULL); 2575 if (IS_ERR(ndst)) { 2576 err = PTR_ERR(ndst); 2577 ndst = NULL; 2578 reason = SKB_DROP_REASON_IP_OUTNOROUTES; 2579 goto tx_error; 2580 } 2581 2582 if (flags & VXLAN_F_MC_ROUTE) 2583 ip6cb_flags |= IP6SKB_MCROUTE; 2584 2585 if (!info) { 2586 u32 rt6i_flags = dst_rt6_info(ndst)->rt6i_flags; 2587 2588 err = encap_bypass_if_local(skb, dev, vxlan, AF_INET6, 2589 dst_port, ifindex, vni, 2590 ndst, rt6i_flags); 2591 if (err) 2592 goto out_unlock; 2593 } 2594 2595 err = skb_tunnel_check_pmtu(skb, ndst, 2596 vxlan_headroom((flags & VXLAN_F_GPE) | VXLAN_F_IPV6), 2597 netif_is_any_bridge_port(dev)); 2598 if (err < 0) { 2599 goto tx_error; 2600 } else if (err) { 2601 if (info) { 2602 struct ip_tunnel_info *unclone; 2603 2604 unclone = skb_tunnel_info_unclone(skb); 2605 if (unlikely(!unclone)) 2606 goto tx_error; 2607 2608 unclone->key.u.ipv6.src = pkey->u.ipv6.dst; 2609 unclone->key.u.ipv6.dst = saddr; 2610 } 2611 2612 vxlan_encap_bypass(skb, vxlan, vxlan, vni, false); 2613 dst_release(ndst); 2614 goto out_unlock; 2615 } 2616 2617 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb); 2618 ttl = ttl ? : ip6_dst_hoplimit(ndst); 2619 skb_scrub_packet(skb, xnet); 2620 err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr), 2621 vni, md, flags, udp_sum); 2622 if (err < 0) { 2623 reason = SKB_DROP_REASON_NOMEM; 2624 goto tx_error; 2625 } 2626 2627 udp_tunnel6_xmit_skb(ndst, sock6->sk, skb, dev, 2628 &saddr, &pkey->u.ipv6.dst, tos, ttl, 2629 pkey->label, src_port, dst_port, !udp_sum, 2630 ip6cb_flags); 2631 #endif 2632 } 2633 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX, pkt_len); 2634 out_unlock: 2635 rcu_read_unlock(); 2636 return; 2637 2638 drop: 2639 dev_dstats_tx_dropped(dev); 2640 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_DROPS, 0); 2641 kfree_skb_reason(skb, reason); 2642 return; 2643 2644 tx_error: 2645 rcu_read_unlock(); 2646 if (err == -ELOOP) 2647 DEV_STATS_INC(dev, collisions); 2648 else if (err == -ENETUNREACH) 2649 DEV_STATS_INC(dev, tx_carrier_errors); 2650 dst_release(ndst); 2651 DEV_STATS_INC(dev, tx_errors); 2652 vxlan_vnifilter_count(vxlan, vni, NULL, VXLAN_VNI_STATS_TX_ERRORS, 0); 2653 kfree_skb_reason(skb, reason); 2654 } 2655 2656 static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev, 2657 struct vxlan_fdb *f, __be32 vni, bool did_rsc) 2658 { 2659 struct vxlan_rdst nh_rdst; 2660 struct nexthop *nh; 2661 bool do_xmit; 2662 u32 hash; 2663 2664 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2665 hash = skb_get_hash(skb); 2666 2667 nh = rcu_dereference(f->nh); 2668 if (!nh) 2669 goto drop; 2670 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2671 2672 if (likely(do_xmit)) 2673 vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc); 2674 else 2675 goto drop; 2676 2677 return; 2678 2679 drop: 2680 dev_dstats_tx_dropped(dev); 2681 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2682 VXLAN_VNI_STATS_TX_DROPS, 0); 2683 dev_kfree_skb(skb); 2684 } 2685 2686 static netdev_tx_t vxlan_xmit_nhid(struct sk_buff *skb, struct net_device *dev, 2687 u32 nhid, __be32 vni) 2688 { 2689 struct vxlan_dev *vxlan = netdev_priv(dev); 2690 struct vxlan_rdst nh_rdst; 2691 struct nexthop *nh; 2692 bool do_xmit; 2693 u32 hash; 2694 2695 memset(&nh_rdst, 0, sizeof(struct vxlan_rdst)); 2696 hash = skb_get_hash(skb); 2697 2698 rcu_read_lock(); 2699 nh = nexthop_find_by_id(dev_net(dev), nhid); 2700 if (unlikely(!nh || !nexthop_is_fdb(nh) || !nexthop_is_multipath(nh))) { 2701 rcu_read_unlock(); 2702 goto drop; 2703 } 2704 do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst); 2705 rcu_read_unlock(); 2706 2707 if (vxlan->cfg.saddr.sa.sa_family != nh_rdst.remote_ip.sa.sa_family) 2708 goto drop; 2709 2710 if (likely(do_xmit)) 2711 vxlan_xmit_one(skb, dev, vni, &nh_rdst, false); 2712 else 2713 goto drop; 2714 2715 return NETDEV_TX_OK; 2716 2717 drop: 2718 dev_dstats_tx_dropped(dev); 2719 vxlan_vnifilter_count(netdev_priv(dev), vni, NULL, 2720 VXLAN_VNI_STATS_TX_DROPS, 0); 2721 dev_kfree_skb(skb); 2722 return NETDEV_TX_OK; 2723 } 2724 2725 /* Transmit local packets over Vxlan 2726 * 2727 * Outer IP header inherits ECN and DF from inner header. 2728 * Outer UDP destination is the VXLAN assigned port. 2729 * source port is based on hash of flow 2730 */ 2731 static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev) 2732 { 2733 struct vxlan_dev *vxlan = netdev_priv(dev); 2734 struct vxlan_rdst *rdst, *fdst = NULL; 2735 const struct ip_tunnel_info *info; 2736 struct vxlan_fdb *f; 2737 struct ethhdr *eth; 2738 __be32 vni = 0; 2739 u32 nhid = 0; 2740 bool did_rsc; 2741 2742 info = skb_tunnel_info(skb); 2743 2744 skb_reset_mac_header(skb); 2745 2746 if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) { 2747 if (info && info->mode & IP_TUNNEL_INFO_BRIDGE && 2748 info->mode & IP_TUNNEL_INFO_TX) { 2749 vni = tunnel_id_to_key32(info->key.tun_id); 2750 nhid = info->key.nhid; 2751 } else { 2752 if (info && info->mode & IP_TUNNEL_INFO_TX) 2753 vxlan_xmit_one(skb, dev, vni, NULL, false); 2754 else 2755 kfree_skb_reason(skb, SKB_DROP_REASON_TUNNEL_TXINFO); 2756 return NETDEV_TX_OK; 2757 } 2758 } 2759 2760 if (vxlan->cfg.flags & VXLAN_F_PROXY) { 2761 eth = eth_hdr(skb); 2762 if (ntohs(eth->h_proto) == ETH_P_ARP) 2763 return arp_reduce(dev, skb, vni); 2764 #if IS_ENABLED(CONFIG_IPV6) 2765 else if (ntohs(eth->h_proto) == ETH_P_IPV6 && 2766 pskb_network_may_pull(skb, sizeof(struct ipv6hdr) + 2767 sizeof(struct nd_msg)) && 2768 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) { 2769 struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1); 2770 2771 if (m->icmph.icmp6_code == 0 && 2772 m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) 2773 return neigh_reduce(dev, skb, vni); 2774 } 2775 #endif 2776 } 2777 2778 if (nhid) 2779 return vxlan_xmit_nhid(skb, dev, nhid, vni); 2780 2781 if (vxlan->cfg.flags & VXLAN_F_MDB) { 2782 struct vxlan_mdb_entry *mdb_entry; 2783 2784 rcu_read_lock(); 2785 mdb_entry = vxlan_mdb_entry_skb_get(vxlan, skb, vni); 2786 if (mdb_entry) { 2787 netdev_tx_t ret; 2788 2789 ret = vxlan_mdb_xmit(vxlan, mdb_entry, skb); 2790 rcu_read_unlock(); 2791 return ret; 2792 } 2793 rcu_read_unlock(); 2794 } 2795 2796 eth = eth_hdr(skb); 2797 rcu_read_lock(); 2798 f = vxlan_find_mac_tx(vxlan, eth->h_dest, vni); 2799 did_rsc = false; 2800 2801 if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) && 2802 (ntohs(eth->h_proto) == ETH_P_IP || 2803 ntohs(eth->h_proto) == ETH_P_IPV6)) { 2804 did_rsc = route_shortcircuit(dev, skb); 2805 eth = eth_hdr(skb); 2806 if (did_rsc) 2807 f = vxlan_find_mac_tx(vxlan, eth->h_dest, vni); 2808 } 2809 2810 if (f == NULL) { 2811 f = vxlan_find_mac_tx(vxlan, all_zeros_mac, vni); 2812 if (f == NULL) { 2813 if ((vxlan->cfg.flags & VXLAN_F_L2MISS) && 2814 !is_multicast_ether_addr(eth->h_dest)) 2815 vxlan_fdb_miss(vxlan, eth->h_dest); 2816 2817 dev_dstats_tx_dropped(dev); 2818 vxlan_vnifilter_count(vxlan, vni, NULL, 2819 VXLAN_VNI_STATS_TX_DROPS, 0); 2820 kfree_skb_reason(skb, SKB_DROP_REASON_NO_TX_TARGET); 2821 goto out; 2822 } 2823 } 2824 2825 if (rcu_access_pointer(f->nh)) { 2826 vxlan_xmit_nh(skb, dev, f, 2827 (vni ? : vxlan->default_dst.remote_vni), did_rsc); 2828 } else { 2829 list_for_each_entry_rcu(rdst, &f->remotes, list) { 2830 struct sk_buff *skb1; 2831 2832 if (!fdst) { 2833 fdst = rdst; 2834 continue; 2835 } 2836 skb1 = skb_clone(skb, GFP_ATOMIC); 2837 if (skb1) 2838 vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc); 2839 } 2840 if (fdst) 2841 vxlan_xmit_one(skb, dev, vni, fdst, did_rsc); 2842 else 2843 kfree_skb_reason(skb, SKB_DROP_REASON_NO_TX_TARGET); 2844 } 2845 2846 out: 2847 rcu_read_unlock(); 2848 return NETDEV_TX_OK; 2849 } 2850 2851 /* Walk the forwarding table and purge stale entries */ 2852 static void vxlan_cleanup(struct timer_list *t) 2853 { 2854 struct vxlan_dev *vxlan = timer_container_of(vxlan, t, age_timer); 2855 unsigned long next_timer = jiffies + FDB_AGE_INTERVAL; 2856 struct vxlan_fdb *f; 2857 2858 if (!netif_running(vxlan->dev)) 2859 return; 2860 2861 rcu_read_lock(); 2862 hlist_for_each_entry_rcu(f, &vxlan->fdb_list, fdb_node) { 2863 unsigned long timeout; 2864 2865 if (f->state & (NUD_PERMANENT | NUD_NOARP)) 2866 continue; 2867 2868 if (f->flags & NTF_EXT_LEARNED) 2869 continue; 2870 2871 timeout = READ_ONCE(f->updated) + vxlan->cfg.age_interval * HZ; 2872 if (time_before_eq(timeout, jiffies)) { 2873 spin_lock(&vxlan->hash_lock); 2874 if (!hlist_unhashed(&f->fdb_node)) { 2875 netdev_dbg(vxlan->dev, "garbage collect %pM\n", 2876 f->key.eth_addr); 2877 f->state = NUD_STALE; 2878 vxlan_fdb_destroy(vxlan, f, true, true); 2879 } 2880 spin_unlock(&vxlan->hash_lock); 2881 } else if (time_before(timeout, next_timer)) { 2882 next_timer = timeout; 2883 } 2884 } 2885 rcu_read_unlock(); 2886 2887 mod_timer(&vxlan->age_timer, next_timer); 2888 } 2889 2890 static void vxlan_vs_del_dev(struct vxlan_dev *vxlan) 2891 { 2892 ASSERT_RTNL(); 2893 2894 hlist_del_init_rcu(&vxlan->hlist4.hlist); 2895 #if IS_ENABLED(CONFIG_IPV6) 2896 hlist_del_init_rcu(&vxlan->hlist6.hlist); 2897 #endif 2898 } 2899 2900 static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan, 2901 struct vxlan_dev_node *node) 2902 { 2903 __be32 vni = vxlan->default_dst.remote_vni; 2904 2905 ASSERT_RTNL(); 2906 2907 node->vxlan = vxlan; 2908 hlist_add_head_rcu(&node->hlist, vni_head(vs, vni)); 2909 } 2910 2911 /* Setup stats when device is created */ 2912 static int vxlan_init(struct net_device *dev) 2913 { 2914 struct vxlan_dev *vxlan = netdev_priv(dev); 2915 int err; 2916 2917 err = rhashtable_init(&vxlan->fdb_hash_tbl, &vxlan_fdb_rht_params); 2918 if (err) 2919 return err; 2920 2921 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 2922 err = vxlan_vnigroup_init(vxlan); 2923 if (err) 2924 goto err_rhashtable_destroy; 2925 } 2926 2927 err = gro_cells_init(&vxlan->gro_cells, dev); 2928 if (err) 2929 goto err_vnigroup_uninit; 2930 2931 err = vxlan_mdb_init(vxlan); 2932 if (err) 2933 goto err_gro_cells_destroy; 2934 2935 netdev_lockdep_set_classes(dev); 2936 return 0; 2937 2938 err_gro_cells_destroy: 2939 gro_cells_destroy(&vxlan->gro_cells); 2940 err_vnigroup_uninit: 2941 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2942 vxlan_vnigroup_uninit(vxlan); 2943 err_rhashtable_destroy: 2944 rhashtable_destroy(&vxlan->fdb_hash_tbl); 2945 return err; 2946 } 2947 2948 static void vxlan_uninit(struct net_device *dev) 2949 { 2950 struct vxlan_dev *vxlan = netdev_priv(dev); 2951 2952 vxlan_mdb_fini(vxlan); 2953 2954 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) 2955 vxlan_vnigroup_uninit(vxlan); 2956 2957 gro_cells_destroy(&vxlan->gro_cells); 2958 2959 rhashtable_destroy(&vxlan->fdb_hash_tbl); 2960 } 2961 2962 /* Start ageing timer and join group when device is brought up */ 2963 static int vxlan_open(struct net_device *dev) 2964 { 2965 struct vxlan_dev *vxlan = netdev_priv(dev); 2966 int ret; 2967 2968 ret = vxlan_sock_add(vxlan); 2969 if (ret < 0) 2970 return ret; 2971 2972 ret = vxlan_multicast_join(vxlan); 2973 if (ret) { 2974 vxlan_sock_release(vxlan); 2975 return ret; 2976 } 2977 2978 if (vxlan->cfg.age_interval) 2979 mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL); 2980 2981 return ret; 2982 } 2983 2984 struct vxlan_fdb_flush_desc { 2985 bool ignore_default_entry; 2986 unsigned long state; 2987 unsigned long state_mask; 2988 unsigned long flags; 2989 unsigned long flags_mask; 2990 __be32 src_vni; 2991 u32 nhid; 2992 __be32 vni; 2993 __be16 port; 2994 union vxlan_addr dst_ip; 2995 }; 2996 2997 static bool vxlan_fdb_is_default_entry(const struct vxlan_fdb *f, 2998 const struct vxlan_dev *vxlan) 2999 { 3000 return is_zero_ether_addr(f->key.eth_addr) && 3001 f->key.vni == vxlan->cfg.vni; 3002 } 3003 3004 static bool vxlan_fdb_nhid_matches(const struct vxlan_fdb *f, u32 nhid) 3005 { 3006 struct nexthop *nh = rtnl_dereference(f->nh); 3007 3008 return nh && nh->id == nhid; 3009 } 3010 3011 static bool vxlan_fdb_flush_matches(const struct vxlan_fdb *f, 3012 const struct vxlan_dev *vxlan, 3013 const struct vxlan_fdb_flush_desc *desc) 3014 { 3015 if (desc->state_mask && (f->state & desc->state_mask) != desc->state) 3016 return false; 3017 3018 if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags) 3019 return false; 3020 3021 if (desc->ignore_default_entry && vxlan_fdb_is_default_entry(f, vxlan)) 3022 return false; 3023 3024 if (desc->src_vni && f->key.vni != desc->src_vni) 3025 return false; 3026 3027 if (desc->nhid && !vxlan_fdb_nhid_matches(f, desc->nhid)) 3028 return false; 3029 3030 return true; 3031 } 3032 3033 static bool 3034 vxlan_fdb_flush_should_match_remotes(const struct vxlan_fdb_flush_desc *desc) 3035 { 3036 return desc->vni || desc->port || desc->dst_ip.sa.sa_family; 3037 } 3038 3039 static bool 3040 vxlan_fdb_flush_remote_matches(const struct vxlan_fdb_flush_desc *desc, 3041 const struct vxlan_rdst *rd) 3042 { 3043 if (desc->vni && rd->remote_vni != desc->vni) 3044 return false; 3045 3046 if (desc->port && rd->remote_port != desc->port) 3047 return false; 3048 3049 if (desc->dst_ip.sa.sa_family && 3050 !vxlan_addr_equal(&rd->remote_ip, &desc->dst_ip)) 3051 return false; 3052 3053 return true; 3054 } 3055 3056 static void 3057 vxlan_fdb_flush_match_remotes(struct vxlan_fdb *f, struct vxlan_dev *vxlan, 3058 const struct vxlan_fdb_flush_desc *desc, 3059 bool *p_destroy_fdb) 3060 { 3061 bool remotes_flushed = false; 3062 struct vxlan_rdst *rd, *tmp; 3063 3064 list_for_each_entry_safe(rd, tmp, &f->remotes, list) { 3065 if (!vxlan_fdb_flush_remote_matches(desc, rd)) 3066 continue; 3067 3068 vxlan_fdb_dst_destroy(vxlan, f, rd, true); 3069 remotes_flushed = true; 3070 } 3071 3072 *p_destroy_fdb = remotes_flushed && list_empty(&f->remotes); 3073 } 3074 3075 /* Purge the forwarding table */ 3076 static void vxlan_flush(struct vxlan_dev *vxlan, 3077 const struct vxlan_fdb_flush_desc *desc) 3078 { 3079 bool match_remotes = vxlan_fdb_flush_should_match_remotes(desc); 3080 struct vxlan_fdb *f; 3081 3082 rcu_read_lock(); 3083 hlist_for_each_entry_rcu(f, &vxlan->fdb_list, fdb_node) { 3084 if (!vxlan_fdb_flush_matches(f, vxlan, desc)) 3085 continue; 3086 3087 spin_lock_bh(&vxlan->hash_lock); 3088 if (hlist_unhashed(&f->fdb_node)) 3089 goto unlock; 3090 3091 if (match_remotes) { 3092 bool destroy_fdb = false; 3093 3094 vxlan_fdb_flush_match_remotes(f, vxlan, desc, 3095 &destroy_fdb); 3096 3097 if (!destroy_fdb) 3098 goto unlock; 3099 } 3100 3101 vxlan_fdb_destroy(vxlan, f, true, true); 3102 unlock: 3103 spin_unlock_bh(&vxlan->hash_lock); 3104 } 3105 rcu_read_unlock(); 3106 } 3107 3108 static const struct nla_policy vxlan_del_bulk_policy[NDA_MAX + 1] = { 3109 [NDA_SRC_VNI] = { .type = NLA_U32 }, 3110 [NDA_NH_ID] = { .type = NLA_U32 }, 3111 [NDA_VNI] = { .type = NLA_U32 }, 3112 [NDA_PORT] = { .type = NLA_U16 }, 3113 [NDA_DST] = NLA_POLICY_RANGE(NLA_BINARY, sizeof(struct in_addr), 3114 sizeof(struct in6_addr)), 3115 [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, 3116 [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, 3117 }; 3118 3119 #define VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS (NTF_MASTER | NTF_SELF) 3120 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES (NUD_PERMANENT | NUD_NOARP) 3121 #define VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS (NTF_EXT_LEARNED | NTF_OFFLOADED | \ 3122 NTF_ROUTER) 3123 3124 static int vxlan_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev, 3125 struct netlink_ext_ack *extack) 3126 { 3127 struct vxlan_dev *vxlan = netdev_priv(dev); 3128 struct vxlan_fdb_flush_desc desc = {}; 3129 struct ndmsg *ndm = nlmsg_data(nlh); 3130 struct nlattr *tb[NDA_MAX + 1]; 3131 u8 ndm_flags; 3132 int err; 3133 3134 ndm_flags = ndm->ndm_flags & ~VXLAN_FDB_FLUSH_IGNORED_NDM_FLAGS; 3135 3136 err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, vxlan_del_bulk_policy, 3137 extack); 3138 if (err) 3139 return err; 3140 3141 if (ndm_flags & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_FLAGS) { 3142 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set"); 3143 return -EINVAL; 3144 } 3145 if (ndm->ndm_state & ~VXLAN_FDB_FLUSH_ALLOWED_NDM_STATES) { 3146 NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set"); 3147 return -EINVAL; 3148 } 3149 3150 desc.state = ndm->ndm_state; 3151 desc.flags = ndm_flags; 3152 3153 if (tb[NDA_NDM_STATE_MASK]) 3154 desc.state_mask = nla_get_u16(tb[NDA_NDM_STATE_MASK]); 3155 3156 if (tb[NDA_NDM_FLAGS_MASK]) 3157 desc.flags_mask = nla_get_u8(tb[NDA_NDM_FLAGS_MASK]); 3158 3159 if (tb[NDA_SRC_VNI]) 3160 desc.src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI])); 3161 3162 if (tb[NDA_NH_ID]) 3163 desc.nhid = nla_get_u32(tb[NDA_NH_ID]); 3164 3165 if (tb[NDA_VNI]) 3166 desc.vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI])); 3167 3168 if (tb[NDA_PORT]) 3169 desc.port = nla_get_be16(tb[NDA_PORT]); 3170 3171 if (tb[NDA_DST]) { 3172 union vxlan_addr ip; 3173 3174 err = vxlan_nla_get_addr(&ip, tb[NDA_DST]); 3175 if (err) { 3176 NL_SET_ERR_MSG_ATTR(extack, tb[NDA_DST], 3177 "Unsupported address family"); 3178 return err; 3179 } 3180 desc.dst_ip = ip; 3181 } 3182 3183 vxlan_flush(vxlan, &desc); 3184 3185 return 0; 3186 } 3187 3188 /* Cleanup timer and forwarding table on shutdown */ 3189 static int vxlan_stop(struct net_device *dev) 3190 { 3191 struct vxlan_dev *vxlan = netdev_priv(dev); 3192 struct vxlan_fdb_flush_desc desc = { 3193 /* Default entry is deleted at vxlan_dellink. */ 3194 .ignore_default_entry = true, 3195 .state = 0, 3196 .state_mask = NUD_PERMANENT | NUD_NOARP, 3197 }; 3198 3199 vxlan_multicast_leave(vxlan); 3200 3201 timer_delete_sync(&vxlan->age_timer); 3202 3203 vxlan_flush(vxlan, &desc); 3204 vxlan_sock_release(vxlan); 3205 3206 return 0; 3207 } 3208 3209 /* Stub, nothing needs to be done. */ 3210 static void vxlan_set_multicast_list(struct net_device *dev) 3211 { 3212 } 3213 3214 static int vxlan_change_mtu(struct net_device *dev, int new_mtu) 3215 { 3216 struct vxlan_dev *vxlan = netdev_priv(dev); 3217 struct vxlan_rdst *dst = &vxlan->default_dst; 3218 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3219 dst->remote_ifindex); 3220 3221 /* This check is different than dev->max_mtu, because it looks at 3222 * the lowerdev->mtu, rather than the static dev->max_mtu 3223 */ 3224 if (lowerdev) { 3225 int max_mtu = lowerdev->mtu - vxlan_headroom(vxlan->cfg.flags); 3226 if (new_mtu > max_mtu) 3227 return -EINVAL; 3228 } 3229 3230 WRITE_ONCE(dev->mtu, new_mtu); 3231 return 0; 3232 } 3233 3234 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 3235 { 3236 struct vxlan_dev *vxlan = netdev_priv(dev); 3237 struct ip_tunnel_info *info = skb_tunnel_info(skb); 3238 __be16 sport, dport; 3239 3240 sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min, 3241 vxlan->cfg.port_max, true); 3242 dport = info->key.tp_dst ? : vxlan->cfg.dst_port; 3243 3244 if (ip_tunnel_info_af(info) == AF_INET) { 3245 struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); 3246 struct rtable *rt; 3247 3248 if (!sock4) 3249 return -EIO; 3250 3251 rt = udp_tunnel_dst_lookup(skb, dev, vxlan->net, 0, 3252 &info->key.u.ipv4.src, 3253 &info->key, 3254 sport, dport, info->key.tos, 3255 &info->dst_cache); 3256 if (IS_ERR(rt)) 3257 return PTR_ERR(rt); 3258 ip_rt_put(rt); 3259 } else { 3260 #if IS_ENABLED(CONFIG_IPV6) 3261 struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); 3262 struct dst_entry *ndst; 3263 3264 if (!sock6) 3265 return -EIO; 3266 3267 ndst = udp_tunnel6_dst_lookup(skb, dev, vxlan->net, sock6->sk, 3268 0, &info->key.u.ipv6.src, 3269 &info->key, 3270 sport, dport, info->key.tos, 3271 &info->dst_cache); 3272 if (IS_ERR(ndst)) 3273 return PTR_ERR(ndst); 3274 dst_release(ndst); 3275 #else /* !CONFIG_IPV6 */ 3276 return -EPFNOSUPPORT; 3277 #endif 3278 } 3279 info->key.tp_src = sport; 3280 info->key.tp_dst = dport; 3281 return 0; 3282 } 3283 3284 static const struct net_device_ops vxlan_netdev_ether_ops = { 3285 .ndo_init = vxlan_init, 3286 .ndo_uninit = vxlan_uninit, 3287 .ndo_open = vxlan_open, 3288 .ndo_stop = vxlan_stop, 3289 .ndo_start_xmit = vxlan_xmit, 3290 .ndo_set_rx_mode = vxlan_set_multicast_list, 3291 .ndo_change_mtu = vxlan_change_mtu, 3292 .ndo_validate_addr = eth_validate_addr, 3293 .ndo_set_mac_address = eth_mac_addr, 3294 .ndo_fdb_add = vxlan_fdb_add, 3295 .ndo_fdb_del = vxlan_fdb_delete, 3296 .ndo_fdb_del_bulk = vxlan_fdb_delete_bulk, 3297 .ndo_fdb_dump = vxlan_fdb_dump, 3298 .ndo_fdb_get = vxlan_fdb_get, 3299 .ndo_mdb_add = vxlan_mdb_add, 3300 .ndo_mdb_del = vxlan_mdb_del, 3301 .ndo_mdb_del_bulk = vxlan_mdb_del_bulk, 3302 .ndo_mdb_dump = vxlan_mdb_dump, 3303 .ndo_mdb_get = vxlan_mdb_get, 3304 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3305 }; 3306 3307 static const struct net_device_ops vxlan_netdev_raw_ops = { 3308 .ndo_init = vxlan_init, 3309 .ndo_uninit = vxlan_uninit, 3310 .ndo_open = vxlan_open, 3311 .ndo_stop = vxlan_stop, 3312 .ndo_start_xmit = vxlan_xmit, 3313 .ndo_change_mtu = vxlan_change_mtu, 3314 .ndo_fill_metadata_dst = vxlan_fill_metadata_dst, 3315 }; 3316 3317 /* Info for udev, that this is a virtual tunnel endpoint */ 3318 static const struct device_type vxlan_type = { 3319 .name = "vxlan", 3320 }; 3321 3322 /* Calls the ndo_udp_tunnel_add of the caller in order to 3323 * supply the listening VXLAN udp ports. Callers are expected 3324 * to implement the ndo_udp_tunnel_add. 3325 */ 3326 static void vxlan_offload_rx_ports(struct net_device *dev, bool push) 3327 { 3328 struct vxlan_sock *vs; 3329 struct net *net = dev_net(dev); 3330 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3331 unsigned int i; 3332 3333 ASSERT_RTNL(); 3334 3335 for (i = 0; i < PORT_HASH_SIZE; ++i) { 3336 hlist_for_each_entry(vs, &vn->sock_list[i], hlist) { 3337 unsigned short type; 3338 3339 if (vs->flags & VXLAN_F_GPE) 3340 type = UDP_TUNNEL_TYPE_VXLAN_GPE; 3341 else 3342 type = UDP_TUNNEL_TYPE_VXLAN; 3343 3344 if (push) 3345 udp_tunnel_push_rx_port(dev, vs->sk, type); 3346 else 3347 udp_tunnel_drop_rx_port(dev, vs->sk, type); 3348 } 3349 } 3350 } 3351 3352 /* Initialize the device structure. */ 3353 static void vxlan_setup(struct net_device *dev) 3354 { 3355 struct vxlan_dev *vxlan = netdev_priv(dev); 3356 3357 eth_hw_addr_random(dev); 3358 ether_setup(dev); 3359 3360 dev->needs_free_netdev = true; 3361 SET_NETDEV_DEVTYPE(dev, &vxlan_type); 3362 3363 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3364 dev->features |= NETIF_F_RXCSUM; 3365 dev->features |= NETIF_F_GSO_SOFTWARE; 3366 3367 /* Partial features are disabled by default. */ 3368 dev->vlan_features = dev->features; 3369 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 3370 dev->hw_features |= NETIF_F_RXCSUM; 3371 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3372 dev->hw_features |= UDP_TUNNEL_PARTIAL_FEATURES; 3373 dev->hw_features |= NETIF_F_GSO_PARTIAL; 3374 3375 dev->hw_enc_features = dev->hw_features; 3376 dev->gso_partial_features = UDP_TUNNEL_PARTIAL_FEATURES; 3377 dev->mangleid_features = NETIF_F_GSO_PARTIAL; 3378 3379 netif_keep_dst(dev); 3380 dev->priv_flags |= IFF_NO_QUEUE; 3381 dev->change_proto_down = true; 3382 dev->lltx = true; 3383 3384 /* MTU range: 68 - 65535 */ 3385 dev->min_mtu = ETH_MIN_MTU; 3386 dev->max_mtu = ETH_MAX_MTU; 3387 3388 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; 3389 INIT_LIST_HEAD(&vxlan->next); 3390 spin_lock_init(&vxlan->hash_lock); 3391 3392 timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE); 3393 3394 vxlan->dev = dev; 3395 3396 INIT_HLIST_HEAD(&vxlan->fdb_list); 3397 } 3398 3399 static void vxlan_ether_setup(struct net_device *dev) 3400 { 3401 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 3402 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 3403 dev->netdev_ops = &vxlan_netdev_ether_ops; 3404 } 3405 3406 static void vxlan_raw_setup(struct net_device *dev) 3407 { 3408 dev->header_ops = NULL; 3409 dev->type = ARPHRD_NONE; 3410 dev->hard_header_len = 0; 3411 dev->addr_len = 0; 3412 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 3413 dev->netdev_ops = &vxlan_netdev_raw_ops; 3414 } 3415 3416 static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = { 3417 [IFLA_VXLAN_UNSPEC] = { .strict_start_type = IFLA_VXLAN_LOCALBYPASS }, 3418 [IFLA_VXLAN_ID] = { .type = NLA_U32 }, 3419 [IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) }, 3420 [IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) }, 3421 [IFLA_VXLAN_LINK] = { .type = NLA_U32 }, 3422 [IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 3423 [IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) }, 3424 [IFLA_VXLAN_TOS] = { .type = NLA_U8 }, 3425 [IFLA_VXLAN_TTL] = { .type = NLA_U8 }, 3426 [IFLA_VXLAN_LABEL] = { .type = NLA_U32 }, 3427 [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 }, 3428 [IFLA_VXLAN_AGEING] = { .type = NLA_U32 }, 3429 [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 }, 3430 [IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) }, 3431 [IFLA_VXLAN_PROXY] = { .type = NLA_U8 }, 3432 [IFLA_VXLAN_RSC] = { .type = NLA_U8 }, 3433 [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 }, 3434 [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 }, 3435 [IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 }, 3436 [IFLA_VXLAN_PORT] = { .type = NLA_U16 }, 3437 [IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 }, 3438 [IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 3439 [IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 3440 [IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 }, 3441 [IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 }, 3442 [IFLA_VXLAN_GBP] = { .type = NLA_FLAG, }, 3443 [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, }, 3444 [IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG }, 3445 [IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG }, 3446 [IFLA_VXLAN_DF] = { .type = NLA_U8 }, 3447 [IFLA_VXLAN_VNIFILTER] = { .type = NLA_U8 }, 3448 [IFLA_VXLAN_LOCALBYPASS] = NLA_POLICY_MAX(NLA_U8, 1), 3449 [IFLA_VXLAN_LABEL_POLICY] = NLA_POLICY_MAX(NLA_U32, VXLAN_LABEL_MAX), 3450 [IFLA_VXLAN_RESERVED_BITS] = NLA_POLICY_EXACT_LEN(sizeof(struct vxlanhdr)), 3451 [IFLA_VXLAN_MC_ROUTE] = NLA_POLICY_MAX(NLA_U8, 1), 3452 }; 3453 3454 static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[], 3455 struct netlink_ext_ack *extack) 3456 { 3457 if (tb[IFLA_ADDRESS]) { 3458 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 3459 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3460 "Provided link layer address is not Ethernet"); 3461 return -EINVAL; 3462 } 3463 3464 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 3465 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 3466 "Provided Ethernet address is not unicast"); 3467 return -EADDRNOTAVAIL; 3468 } 3469 } 3470 3471 if (tb[IFLA_MTU]) { 3472 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 3473 3474 if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) { 3475 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 3476 "MTU must be between 68 and 65535"); 3477 return -EINVAL; 3478 } 3479 } 3480 3481 if (!data) { 3482 NL_SET_ERR_MSG(extack, 3483 "Required attributes not provided to perform the operation"); 3484 return -EINVAL; 3485 } 3486 3487 if (data[IFLA_VXLAN_ID]) { 3488 u32 id = nla_get_u32(data[IFLA_VXLAN_ID]); 3489 3490 if (id >= VXLAN_N_VID) { 3491 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID], 3492 "VXLAN ID must be lower than 16777216"); 3493 return -ERANGE; 3494 } 3495 } 3496 3497 if (data[IFLA_VXLAN_PORT_RANGE]) { 3498 const struct ifla_vxlan_port_range *p 3499 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 3500 3501 if (ntohs(p->high) < ntohs(p->low)) { 3502 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE], 3503 "Invalid source port range"); 3504 return -EINVAL; 3505 } 3506 } 3507 3508 if (data[IFLA_VXLAN_DF]) { 3509 enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]); 3510 3511 if (df < 0 || df > VXLAN_DF_MAX) { 3512 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF], 3513 "Invalid DF attribute"); 3514 return -EINVAL; 3515 } 3516 } 3517 3518 return 0; 3519 } 3520 3521 static void vxlan_get_drvinfo(struct net_device *netdev, 3522 struct ethtool_drvinfo *drvinfo) 3523 { 3524 strscpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version)); 3525 strscpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver)); 3526 } 3527 3528 static int vxlan_get_link_ksettings(struct net_device *dev, 3529 struct ethtool_link_ksettings *cmd) 3530 { 3531 struct vxlan_dev *vxlan = netdev_priv(dev); 3532 struct vxlan_rdst *dst = &vxlan->default_dst; 3533 struct net_device *lowerdev = __dev_get_by_index(vxlan->net, 3534 dst->remote_ifindex); 3535 3536 if (!lowerdev) { 3537 cmd->base.duplex = DUPLEX_UNKNOWN; 3538 cmd->base.port = PORT_OTHER; 3539 cmd->base.speed = SPEED_UNKNOWN; 3540 3541 return 0; 3542 } 3543 3544 return __ethtool_get_link_ksettings(lowerdev, cmd); 3545 } 3546 3547 static const struct ethtool_ops vxlan_ethtool_ops = { 3548 .get_drvinfo = vxlan_get_drvinfo, 3549 .get_link = ethtool_op_get_link, 3550 .get_link_ksettings = vxlan_get_link_ksettings, 3551 }; 3552 3553 static struct sock *vxlan_create_sock(struct net *net, bool ipv6, 3554 __be16 port, u32 flags, int ifindex) 3555 { 3556 struct socket *sock; 3557 struct udp_port_cfg udp_conf; 3558 int err; 3559 3560 memset(&udp_conf, 0, sizeof(udp_conf)); 3561 3562 if (ipv6) { 3563 udp_conf.family = AF_INET6; 3564 udp_conf.use_udp6_rx_checksums = 3565 !(flags & VXLAN_F_UDP_ZERO_CSUM6_RX); 3566 udp_conf.ipv6_v6only = 1; 3567 } else { 3568 udp_conf.family = AF_INET; 3569 } 3570 3571 udp_conf.local_udp_port = port; 3572 udp_conf.bind_ifindex = ifindex; 3573 3574 /* Open UDP socket */ 3575 err = udp_sock_create(net, &udp_conf, &sock); 3576 if (err < 0) 3577 return ERR_PTR(err); 3578 3579 udp_allow_gso(sock->sk); 3580 return sock->sk; 3581 } 3582 3583 /* Create new listen socket if needed */ 3584 static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, 3585 __be16 port, u32 flags, 3586 int ifindex) 3587 { 3588 struct udp_tunnel_sock_cfg tunnel_cfg; 3589 struct vxlan_sock *vs; 3590 struct sock *sk; 3591 unsigned int h; 3592 3593 ASSERT_RTNL(); 3594 3595 vs = kzalloc_obj(*vs); 3596 if (!vs) 3597 return ERR_PTR(-ENOMEM); 3598 3599 for (h = 0; h < VNI_HASH_SIZE; ++h) 3600 INIT_HLIST_HEAD(&vs->vni_list[h]); 3601 3602 sk = vxlan_create_sock(net, ipv6, port, flags, ifindex); 3603 if (IS_ERR(sk)) { 3604 kfree(vs); 3605 return ERR_CAST(sk); 3606 } 3607 3608 vs->sk = sk; 3609 refcount_set(&vs->refcnt, 1); 3610 vs->flags = (flags & VXLAN_F_RCV_FLAGS); 3611 3612 hlist_add_head_rcu(&vs->hlist, vs_head(net, port)); 3613 udp_tunnel_notify_add_rx_port(sk, 3614 (vs->flags & VXLAN_F_GPE) ? 3615 UDP_TUNNEL_TYPE_VXLAN_GPE : 3616 UDP_TUNNEL_TYPE_VXLAN); 3617 3618 /* Mark socket as an encapsulation socket. */ 3619 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 3620 tunnel_cfg.sk_user_data = vs; 3621 tunnel_cfg.encap_type = 1; 3622 tunnel_cfg.encap_rcv = vxlan_rcv; 3623 tunnel_cfg.encap_err_lookup = vxlan_err_lookup; 3624 tunnel_cfg.encap_destroy = NULL; 3625 if (vs->flags & VXLAN_F_GPE) { 3626 tunnel_cfg.gro_receive = vxlan_gpe_gro_receive; 3627 tunnel_cfg.gro_complete = vxlan_gpe_gro_complete; 3628 } else { 3629 tunnel_cfg.gro_receive = vxlan_gro_receive; 3630 tunnel_cfg.gro_complete = vxlan_gro_complete; 3631 } 3632 3633 setup_udp_tunnel_sock(net, sk, &tunnel_cfg); 3634 3635 return vs; 3636 } 3637 3638 static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) 3639 { 3640 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3641 struct vxlan_sock *vs = NULL; 3642 struct vxlan_dev_node *node; 3643 int l3mdev_index = 0; 3644 3645 ASSERT_RTNL(); 3646 3647 if (vxlan->cfg.remote_ifindex) 3648 l3mdev_index = l3mdev_master_upper_ifindex_by_index( 3649 vxlan->net, vxlan->cfg.remote_ifindex); 3650 3651 if (!vxlan->cfg.no_share) { 3652 rcu_read_lock(); 3653 vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, 3654 vxlan->cfg.dst_port, vxlan->cfg.flags, 3655 l3mdev_index); 3656 if (vs && !refcount_inc_not_zero(&vs->refcnt)) { 3657 rcu_read_unlock(); 3658 return -EBUSY; 3659 } 3660 rcu_read_unlock(); 3661 } 3662 if (!vs) 3663 vs = vxlan_socket_create(vxlan->net, ipv6, 3664 vxlan->cfg.dst_port, vxlan->cfg.flags, 3665 l3mdev_index); 3666 if (IS_ERR(vs)) 3667 return PTR_ERR(vs); 3668 #if IS_ENABLED(CONFIG_IPV6) 3669 if (ipv6) { 3670 rcu_assign_pointer(vxlan->vn6_sock, vs); 3671 node = &vxlan->hlist6; 3672 } else 3673 #endif 3674 { 3675 rcu_assign_pointer(vxlan->vn4_sock, vs); 3676 node = &vxlan->hlist4; 3677 } 3678 3679 if (metadata && (vxlan->cfg.flags & VXLAN_F_VNIFILTER)) 3680 vxlan_vs_add_vnigrp(vxlan, vs, ipv6); 3681 else 3682 vxlan_vs_add_dev(vs, vxlan, node); 3683 3684 return 0; 3685 } 3686 3687 static int vxlan_sock_add(struct vxlan_dev *vxlan) 3688 { 3689 bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA; 3690 bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata; 3691 bool ipv4 = !ipv6 || metadata; 3692 int ret = 0; 3693 3694 RCU_INIT_POINTER(vxlan->vn4_sock, NULL); 3695 #if IS_ENABLED(CONFIG_IPV6) 3696 RCU_INIT_POINTER(vxlan->vn6_sock, NULL); 3697 if (ipv6) { 3698 ret = __vxlan_sock_add(vxlan, true); 3699 if (ret < 0 && ret != -EAFNOSUPPORT) 3700 ipv4 = false; 3701 } 3702 #endif 3703 if (ipv4) 3704 ret = __vxlan_sock_add(vxlan, false); 3705 if (ret < 0) 3706 vxlan_sock_release(vxlan); 3707 return ret; 3708 } 3709 3710 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, 3711 struct vxlan_config *conf, __be32 vni) 3712 { 3713 struct vxlan_net *vn = net_generic(src_net, vxlan_net_id); 3714 struct vxlan_dev *tmp; 3715 3716 list_for_each_entry(tmp, &vn->vxlan_list, next) { 3717 if (tmp == vxlan) 3718 continue; 3719 if (tmp->cfg.flags & VXLAN_F_VNIFILTER) { 3720 if (!vxlan_vnifilter_lookup(tmp, vni)) 3721 continue; 3722 } else if (tmp->cfg.vni != vni) { 3723 continue; 3724 } 3725 if (tmp->cfg.dst_port != conf->dst_port) 3726 continue; 3727 if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) != 3728 (conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6))) 3729 continue; 3730 3731 if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) && 3732 tmp->cfg.remote_ifindex != conf->remote_ifindex) 3733 continue; 3734 3735 return -EEXIST; 3736 } 3737 3738 return 0; 3739 } 3740 3741 static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf, 3742 struct net_device **lower, 3743 struct vxlan_dev *old, 3744 struct netlink_ext_ack *extack) 3745 { 3746 bool use_ipv6 = false; 3747 3748 if (conf->flags & VXLAN_F_GPE) { 3749 /* For now, allow GPE only together with 3750 * COLLECT_METADATA. This can be relaxed later; in such 3751 * case, the other side of the PtP link will have to be 3752 * provided. 3753 */ 3754 if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) || 3755 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3756 NL_SET_ERR_MSG(extack, 3757 "VXLAN GPE does not support this combination of attributes"); 3758 return -EINVAL; 3759 } 3760 } 3761 3762 if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) { 3763 /* Unless IPv6 is explicitly requested, assume IPv4 */ 3764 conf->remote_ip.sa.sa_family = AF_INET; 3765 conf->saddr.sa.sa_family = AF_INET; 3766 } else if (!conf->remote_ip.sa.sa_family) { 3767 conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family; 3768 } else if (!conf->saddr.sa.sa_family) { 3769 conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family; 3770 } 3771 3772 if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) { 3773 NL_SET_ERR_MSG(extack, 3774 "Local and remote address must be from the same family"); 3775 return -EINVAL; 3776 } 3777 3778 if (vxlan_addr_multicast(&conf->saddr)) { 3779 NL_SET_ERR_MSG(extack, "Local address cannot be multicast"); 3780 return -EINVAL; 3781 } 3782 3783 if (conf->saddr.sa.sa_family == AF_INET6) { 3784 if (!IS_ENABLED(CONFIG_IPV6)) { 3785 NL_SET_ERR_MSG(extack, 3786 "IPv6 support not enabled in the kernel"); 3787 return -EPFNOSUPPORT; 3788 } 3789 use_ipv6 = true; 3790 conf->flags |= VXLAN_F_IPV6; 3791 3792 if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) { 3793 int local_type = 3794 ipv6_addr_type(&conf->saddr.sin6.sin6_addr); 3795 int remote_type = 3796 ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr); 3797 3798 if (local_type & IPV6_ADDR_LINKLOCAL) { 3799 if (!(remote_type & IPV6_ADDR_LINKLOCAL) && 3800 (remote_type != IPV6_ADDR_ANY)) { 3801 NL_SET_ERR_MSG(extack, 3802 "Invalid combination of local and remote address scopes"); 3803 return -EINVAL; 3804 } 3805 3806 conf->flags |= VXLAN_F_IPV6_LINKLOCAL; 3807 } else { 3808 if (remote_type == 3809 (IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) { 3810 NL_SET_ERR_MSG(extack, 3811 "Invalid combination of local and remote address scopes"); 3812 return -EINVAL; 3813 } 3814 3815 conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL; 3816 } 3817 } 3818 } 3819 3820 if (conf->label && !use_ipv6) { 3821 NL_SET_ERR_MSG(extack, 3822 "Label attribute only applies to IPv6 VXLAN devices"); 3823 return -EINVAL; 3824 } 3825 3826 if (conf->label_policy && !use_ipv6) { 3827 NL_SET_ERR_MSG(extack, 3828 "Label policy only applies to IPv6 VXLAN devices"); 3829 return -EINVAL; 3830 } 3831 3832 if (conf->remote_ifindex) { 3833 struct net_device *lowerdev; 3834 3835 lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex); 3836 if (!lowerdev) { 3837 NL_SET_ERR_MSG(extack, 3838 "Invalid local interface, device not found"); 3839 return -ENODEV; 3840 } 3841 3842 #if IS_ENABLED(CONFIG_IPV6) 3843 if (use_ipv6) { 3844 struct inet6_dev *idev = __in6_dev_get(lowerdev); 3845 3846 if (idev && idev->cnf.disable_ipv6) { 3847 NL_SET_ERR_MSG(extack, 3848 "IPv6 support disabled by administrator"); 3849 return -EPERM; 3850 } 3851 } 3852 #endif 3853 3854 *lower = lowerdev; 3855 } else { 3856 if (vxlan_addr_multicast(&conf->remote_ip)) { 3857 NL_SET_ERR_MSG(extack, 3858 "Local interface required for multicast remote destination"); 3859 3860 return -EINVAL; 3861 } 3862 3863 #if IS_ENABLED(CONFIG_IPV6) 3864 if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) { 3865 NL_SET_ERR_MSG(extack, 3866 "Local interface required for link-local local/remote addresses"); 3867 return -EINVAL; 3868 } 3869 #endif 3870 3871 *lower = NULL; 3872 } 3873 3874 if (!conf->dst_port) { 3875 if (conf->flags & VXLAN_F_GPE) 3876 conf->dst_port = htons(IANA_VXLAN_GPE_UDP_PORT); 3877 else 3878 conf->dst_port = htons(vxlan_port); 3879 } 3880 3881 if (!conf->age_interval) 3882 conf->age_interval = FDB_AGE_DEFAULT; 3883 3884 if (vxlan_vni_in_use(src_net, old, conf, conf->vni)) { 3885 NL_SET_ERR_MSG(extack, 3886 "A VXLAN device with the specified VNI already exists"); 3887 return -EEXIST; 3888 } 3889 3890 return 0; 3891 } 3892 3893 static void vxlan_config_apply(struct net_device *dev, 3894 struct vxlan_config *conf, 3895 struct net_device *lowerdev, 3896 struct net *src_net, 3897 bool changelink) 3898 { 3899 struct vxlan_dev *vxlan = netdev_priv(dev); 3900 struct vxlan_rdst *dst = &vxlan->default_dst; 3901 unsigned short needed_headroom = ETH_HLEN; 3902 int max_mtu = ETH_MAX_MTU; 3903 u32 flags = conf->flags; 3904 3905 if (!changelink) { 3906 if (flags & VXLAN_F_GPE) 3907 vxlan_raw_setup(dev); 3908 else 3909 vxlan_ether_setup(dev); 3910 3911 if (conf->mtu) 3912 dev->mtu = conf->mtu; 3913 3914 vxlan->net = src_net; 3915 } 3916 3917 dst->remote_vni = conf->vni; 3918 3919 memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip)); 3920 3921 if (lowerdev) { 3922 dst->remote_ifindex = conf->remote_ifindex; 3923 3924 netif_inherit_tso_max(dev, lowerdev); 3925 3926 needed_headroom = lowerdev->hard_header_len; 3927 needed_headroom += lowerdev->needed_headroom; 3928 3929 dev->needed_tailroom = lowerdev->needed_tailroom; 3930 3931 max_mtu = lowerdev->mtu - vxlan_headroom(flags); 3932 if (max_mtu < ETH_MIN_MTU) 3933 max_mtu = ETH_MIN_MTU; 3934 3935 if (!changelink && !conf->mtu) 3936 dev->mtu = max_mtu; 3937 } 3938 3939 if (dev->mtu > max_mtu) 3940 dev->mtu = max_mtu; 3941 3942 if (flags & VXLAN_F_COLLECT_METADATA) 3943 flags |= VXLAN_F_IPV6; 3944 needed_headroom += vxlan_headroom(flags); 3945 dev->needed_headroom = needed_headroom; 3946 3947 memcpy(&vxlan->cfg, conf, sizeof(*conf)); 3948 } 3949 3950 static int vxlan_dev_configure(struct net *src_net, struct net_device *dev, 3951 struct vxlan_config *conf, 3952 struct netlink_ext_ack *extack) 3953 { 3954 struct vxlan_dev *vxlan = netdev_priv(dev); 3955 struct net_device *lowerdev; 3956 int ret; 3957 3958 ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack); 3959 if (ret) 3960 return ret; 3961 3962 vxlan_config_apply(dev, conf, lowerdev, src_net, false); 3963 3964 return 0; 3965 } 3966 3967 static int __vxlan_dev_create(struct net *net, struct net_device *dev, 3968 struct vxlan_config *conf, 3969 struct netlink_ext_ack *extack) 3970 { 3971 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 3972 struct vxlan_dev *vxlan = netdev_priv(dev); 3973 struct net_device *remote_dev = NULL; 3974 struct vxlan_rdst *dst; 3975 int err; 3976 3977 dst = &vxlan->default_dst; 3978 err = vxlan_dev_configure(net, dev, conf, extack); 3979 if (err) 3980 return err; 3981 3982 dev->ethtool_ops = &vxlan_ethtool_ops; 3983 3984 err = register_netdevice(dev); 3985 if (err) 3986 return err; 3987 3988 if (dst->remote_ifindex) { 3989 remote_dev = __dev_get_by_index(net, dst->remote_ifindex); 3990 if (!remote_dev) { 3991 err = -ENODEV; 3992 goto unregister; 3993 } 3994 3995 err = netdev_upper_dev_link(remote_dev, dev, extack); 3996 if (err) 3997 goto unregister; 3998 3999 dst->remote_dev = remote_dev; 4000 } 4001 4002 err = rtnl_configure_link(dev, NULL, 0, NULL); 4003 if (err < 0) 4004 goto unlink; 4005 4006 /* create an fdb entry for a valid default destination */ 4007 if (!vxlan_addr_any(&dst->remote_ip)) { 4008 spin_lock_bh(&vxlan->hash_lock); 4009 err = vxlan_fdb_update(vxlan, all_zeros_mac, 4010 &dst->remote_ip, 4011 NUD_REACHABLE | NUD_PERMANENT, 4012 NLM_F_EXCL | NLM_F_CREATE, 4013 vxlan->cfg.dst_port, 4014 dst->remote_vni, 4015 dst->remote_vni, 4016 dst->remote_ifindex, 4017 NTF_SELF, 0, true, extack); 4018 spin_unlock_bh(&vxlan->hash_lock); 4019 if (err) 4020 goto unlink; 4021 } 4022 4023 list_add(&vxlan->next, &vn->vxlan_list); 4024 4025 return 0; 4026 4027 unlink: 4028 if (remote_dev) 4029 netdev_upper_dev_unlink(remote_dev, dev); 4030 unregister: 4031 unregister_netdevice(dev); 4032 return err; 4033 } 4034 4035 /* Set/clear flags based on attribute */ 4036 static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[], 4037 int attrtype, unsigned long mask, bool changelink, 4038 bool changelink_supported, 4039 struct netlink_ext_ack *extack) 4040 { 4041 unsigned long flags; 4042 4043 if (!tb[attrtype]) 4044 return 0; 4045 4046 if (changelink && !changelink_supported) { 4047 vxlan_flag_attr_error(attrtype, extack); 4048 return -EOPNOTSUPP; 4049 } 4050 4051 if (vxlan_policy[attrtype].type == NLA_FLAG) 4052 flags = conf->flags | mask; 4053 else if (nla_get_u8(tb[attrtype])) 4054 flags = conf->flags | mask; 4055 else 4056 flags = conf->flags & ~mask; 4057 4058 conf->flags = flags; 4059 4060 return 0; 4061 } 4062 4063 static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[], 4064 struct net_device *dev, struct vxlan_config *conf, 4065 bool changelink, struct netlink_ext_ack *extack) 4066 { 4067 struct vxlanhdr used_bits = { 4068 .vx_flags = VXLAN_HF_VNI, 4069 .vx_vni = VXLAN_VNI_MASK, 4070 }; 4071 struct vxlan_dev *vxlan = netdev_priv(dev); 4072 int err = 0; 4073 4074 memset(conf, 0, sizeof(*conf)); 4075 4076 /* if changelink operation, start with old existing cfg */ 4077 if (changelink) 4078 memcpy(conf, &vxlan->cfg, sizeof(*conf)); 4079 4080 if (data[IFLA_VXLAN_ID]) { 4081 __be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID])); 4082 4083 if (changelink && (vni != conf->vni)) { 4084 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI"); 4085 return -EOPNOTSUPP; 4086 } 4087 conf->vni = vni; 4088 } 4089 4090 if (data[IFLA_VXLAN_GROUP]) { 4091 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) { 4092 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group"); 4093 return -EOPNOTSUPP; 4094 } 4095 4096 conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]); 4097 conf->remote_ip.sa.sa_family = AF_INET; 4098 } else if (data[IFLA_VXLAN_GROUP6]) { 4099 if (!IS_ENABLED(CONFIG_IPV6)) { 4100 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel"); 4101 return -EPFNOSUPPORT; 4102 } 4103 4104 if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) { 4105 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group"); 4106 return -EOPNOTSUPP; 4107 } 4108 4109 conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]); 4110 conf->remote_ip.sa.sa_family = AF_INET6; 4111 } 4112 4113 if (data[IFLA_VXLAN_LOCAL]) { 4114 if (changelink && (conf->saddr.sa.sa_family != AF_INET)) { 4115 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old"); 4116 return -EOPNOTSUPP; 4117 } 4118 4119 conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]); 4120 conf->saddr.sa.sa_family = AF_INET; 4121 } else if (data[IFLA_VXLAN_LOCAL6]) { 4122 if (!IS_ENABLED(CONFIG_IPV6)) { 4123 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel"); 4124 return -EPFNOSUPPORT; 4125 } 4126 4127 if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) { 4128 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old"); 4129 return -EOPNOTSUPP; 4130 } 4131 4132 /* TODO: respect scope id */ 4133 conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]); 4134 conf->saddr.sa.sa_family = AF_INET6; 4135 } 4136 4137 if (data[IFLA_VXLAN_LINK]) 4138 conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]); 4139 4140 if (data[IFLA_VXLAN_TOS]) 4141 conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]); 4142 4143 if (data[IFLA_VXLAN_TTL]) 4144 conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]); 4145 4146 if (data[IFLA_VXLAN_TTL_INHERIT]) { 4147 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT, 4148 VXLAN_F_TTL_INHERIT, changelink, false, 4149 extack); 4150 if (err) 4151 return err; 4152 4153 } 4154 4155 if (data[IFLA_VXLAN_LABEL]) 4156 conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) & 4157 IPV6_FLOWLABEL_MASK; 4158 if (data[IFLA_VXLAN_LABEL_POLICY]) 4159 conf->label_policy = nla_get_u32(data[IFLA_VXLAN_LABEL_POLICY]); 4160 4161 if (data[IFLA_VXLAN_LEARNING]) { 4162 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING, 4163 VXLAN_F_LEARN, changelink, true, 4164 extack); 4165 if (err) 4166 return err; 4167 } else if (!changelink) { 4168 /* default to learn on a new device */ 4169 conf->flags |= VXLAN_F_LEARN; 4170 } 4171 4172 if (data[IFLA_VXLAN_AGEING]) 4173 conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]); 4174 4175 if (data[IFLA_VXLAN_PROXY]) { 4176 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY, 4177 VXLAN_F_PROXY, changelink, false, 4178 extack); 4179 if (err) 4180 return err; 4181 } 4182 4183 if (data[IFLA_VXLAN_RSC]) { 4184 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC, 4185 VXLAN_F_RSC, changelink, false, 4186 extack); 4187 if (err) 4188 return err; 4189 } 4190 4191 if (data[IFLA_VXLAN_L2MISS]) { 4192 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS, 4193 VXLAN_F_L2MISS, changelink, false, 4194 extack); 4195 if (err) 4196 return err; 4197 } 4198 4199 if (data[IFLA_VXLAN_L3MISS]) { 4200 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS, 4201 VXLAN_F_L3MISS, changelink, false, 4202 extack); 4203 if (err) 4204 return err; 4205 } 4206 4207 if (data[IFLA_VXLAN_LIMIT]) { 4208 if (changelink) { 4209 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT], 4210 "Cannot change limit"); 4211 return -EOPNOTSUPP; 4212 } 4213 conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]); 4214 } 4215 4216 if (data[IFLA_VXLAN_COLLECT_METADATA]) { 4217 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA, 4218 VXLAN_F_COLLECT_METADATA, changelink, false, 4219 extack); 4220 if (err) 4221 return err; 4222 } 4223 4224 if (data[IFLA_VXLAN_PORT_RANGE]) { 4225 if (!changelink) { 4226 const struct ifla_vxlan_port_range *p 4227 = nla_data(data[IFLA_VXLAN_PORT_RANGE]); 4228 conf->port_min = ntohs(p->low); 4229 conf->port_max = ntohs(p->high); 4230 } else { 4231 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE], 4232 "Cannot change port range"); 4233 return -EOPNOTSUPP; 4234 } 4235 } 4236 4237 if (data[IFLA_VXLAN_PORT]) { 4238 if (changelink) { 4239 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT], 4240 "Cannot change port"); 4241 return -EOPNOTSUPP; 4242 } 4243 conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]); 4244 } 4245 4246 if (data[IFLA_VXLAN_UDP_CSUM]) { 4247 if (changelink) { 4248 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM], 4249 "Cannot change UDP_CSUM flag"); 4250 return -EOPNOTSUPP; 4251 } 4252 if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM])) 4253 conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX; 4254 } 4255 4256 if (data[IFLA_VXLAN_LOCALBYPASS]) { 4257 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LOCALBYPASS, 4258 VXLAN_F_LOCALBYPASS, changelink, 4259 true, extack); 4260 if (err) 4261 return err; 4262 } else if (!changelink) { 4263 /* default to local bypass on a new device */ 4264 conf->flags |= VXLAN_F_LOCALBYPASS; 4265 } 4266 4267 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) { 4268 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4269 VXLAN_F_UDP_ZERO_CSUM6_TX, changelink, 4270 false, extack); 4271 if (err) 4272 return err; 4273 } 4274 4275 if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) { 4276 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4277 VXLAN_F_UDP_ZERO_CSUM6_RX, changelink, 4278 false, extack); 4279 if (err) 4280 return err; 4281 } 4282 4283 if (data[IFLA_VXLAN_REMCSUM_TX]) { 4284 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX, 4285 VXLAN_F_REMCSUM_TX, changelink, false, 4286 extack); 4287 if (err) 4288 return err; 4289 } 4290 4291 if (data[IFLA_VXLAN_REMCSUM_RX]) { 4292 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX, 4293 VXLAN_F_REMCSUM_RX, changelink, false, 4294 extack); 4295 if (err) 4296 return err; 4297 used_bits.vx_flags |= VXLAN_HF_RCO; 4298 used_bits.vx_vni |= ~VXLAN_VNI_MASK; 4299 } 4300 4301 if (data[IFLA_VXLAN_GBP]) { 4302 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP, 4303 VXLAN_F_GBP, changelink, false, extack); 4304 if (err) 4305 return err; 4306 used_bits.vx_flags |= VXLAN_GBP_USED_BITS; 4307 } 4308 4309 if (data[IFLA_VXLAN_GPE]) { 4310 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE, 4311 VXLAN_F_GPE, changelink, false, 4312 extack); 4313 if (err) 4314 return err; 4315 4316 used_bits.vx_flags |= VXLAN_GPE_USED_BITS; 4317 } 4318 4319 if (data[IFLA_VXLAN_RESERVED_BITS]) { 4320 struct vxlanhdr reserved_bits; 4321 4322 if (changelink) { 4323 NL_SET_ERR_MSG_ATTR(extack, 4324 data[IFLA_VXLAN_RESERVED_BITS], 4325 "Cannot change reserved_bits"); 4326 return -EOPNOTSUPP; 4327 } 4328 4329 nla_memcpy(&reserved_bits, data[IFLA_VXLAN_RESERVED_BITS], 4330 sizeof(reserved_bits)); 4331 if (used_bits.vx_flags & reserved_bits.vx_flags || 4332 used_bits.vx_vni & reserved_bits.vx_vni) { 4333 __be64 ub_be64, rb_be64; 4334 4335 memcpy(&ub_be64, &used_bits, sizeof(ub_be64)); 4336 memcpy(&rb_be64, &reserved_bits, sizeof(rb_be64)); 4337 4338 NL_SET_ERR_MSG_ATTR_FMT(extack, 4339 data[IFLA_VXLAN_RESERVED_BITS], 4340 "Used bits %#018llx cannot overlap reserved bits %#018llx", 4341 be64_to_cpu(ub_be64), 4342 be64_to_cpu(rb_be64)); 4343 return -EINVAL; 4344 } 4345 4346 conf->reserved_bits = reserved_bits; 4347 } else { 4348 /* For backwards compatibility, only allow reserved fields to be 4349 * used by VXLAN extensions if explicitly requested. 4350 */ 4351 conf->reserved_bits = (struct vxlanhdr) { 4352 .vx_flags = ~used_bits.vx_flags, 4353 .vx_vni = ~used_bits.vx_vni, 4354 }; 4355 } 4356 4357 if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) { 4358 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL, 4359 VXLAN_F_REMCSUM_NOPARTIAL, changelink, 4360 false, extack); 4361 if (err) 4362 return err; 4363 } 4364 4365 if (data[IFLA_VXLAN_MC_ROUTE]) { 4366 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_MC_ROUTE, 4367 VXLAN_F_MC_ROUTE, changelink, 4368 true, extack); 4369 if (err) 4370 return err; 4371 } 4372 4373 if (tb[IFLA_MTU]) { 4374 if (changelink) { 4375 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU], 4376 "Cannot change mtu"); 4377 return -EOPNOTSUPP; 4378 } 4379 conf->mtu = nla_get_u32(tb[IFLA_MTU]); 4380 } 4381 4382 if (data[IFLA_VXLAN_DF]) 4383 conf->df = nla_get_u8(data[IFLA_VXLAN_DF]); 4384 4385 if (data[IFLA_VXLAN_VNIFILTER]) { 4386 err = vxlan_nl2flag(conf, data, IFLA_VXLAN_VNIFILTER, 4387 VXLAN_F_VNIFILTER, changelink, false, 4388 extack); 4389 if (err) 4390 return err; 4391 4392 if ((conf->flags & VXLAN_F_VNIFILTER) && 4393 !(conf->flags & VXLAN_F_COLLECT_METADATA)) { 4394 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_VNIFILTER], 4395 "vxlan vnifilter only valid in collect metadata mode"); 4396 return -EINVAL; 4397 } 4398 } 4399 4400 return 0; 4401 } 4402 4403 static int vxlan_newlink(struct net_device *dev, 4404 struct rtnl_newlink_params *params, 4405 struct netlink_ext_ack *extack) 4406 { 4407 struct net *link_net = rtnl_newlink_link_net(params); 4408 struct nlattr **data = params->data; 4409 struct nlattr **tb = params->tb; 4410 struct vxlan_config conf; 4411 int err; 4412 4413 err = vxlan_nl2conf(tb, data, dev, &conf, false, extack); 4414 if (err) 4415 return err; 4416 4417 return __vxlan_dev_create(link_net, dev, &conf, extack); 4418 } 4419 4420 static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[], 4421 struct nlattr *data[], 4422 struct netlink_ext_ack *extack) 4423 { 4424 struct vxlan_dev *vxlan = netdev_priv(dev); 4425 bool rem_ip_changed, change_igmp; 4426 struct net_device *lowerdev; 4427 struct vxlan_config conf; 4428 struct vxlan_rdst *dst; 4429 int err; 4430 4431 if (!rtnl_dev_link_net_capable(dev, vxlan->net)) 4432 return -EPERM; 4433 4434 dst = &vxlan->default_dst; 4435 err = vxlan_nl2conf(tb, data, dev, &conf, true, extack); 4436 if (err) 4437 return err; 4438 4439 err = vxlan_config_validate(vxlan->net, &conf, &lowerdev, 4440 vxlan, extack); 4441 if (err) 4442 return err; 4443 4444 if (dst->remote_dev == lowerdev) 4445 lowerdev = NULL; 4446 4447 err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev, 4448 extack); 4449 if (err) 4450 return err; 4451 4452 rem_ip_changed = !vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip); 4453 change_igmp = vxlan->dev->flags & IFF_UP && 4454 (rem_ip_changed || 4455 dst->remote_ifindex != conf.remote_ifindex); 4456 4457 /* handle default dst entry */ 4458 if (rem_ip_changed) { 4459 spin_lock_bh(&vxlan->hash_lock); 4460 if (!vxlan_addr_any(&conf.remote_ip)) { 4461 err = vxlan_fdb_update(vxlan, all_zeros_mac, 4462 &conf.remote_ip, 4463 NUD_REACHABLE | NUD_PERMANENT, 4464 NLM_F_APPEND | NLM_F_CREATE, 4465 vxlan->cfg.dst_port, 4466 conf.vni, conf.vni, 4467 conf.remote_ifindex, 4468 NTF_SELF, 0, true, extack); 4469 if (err) { 4470 spin_unlock_bh(&vxlan->hash_lock); 4471 netdev_adjacent_change_abort(dst->remote_dev, 4472 lowerdev, dev); 4473 return err; 4474 } 4475 } 4476 if (!vxlan_addr_any(&dst->remote_ip)) 4477 __vxlan_fdb_delete(vxlan, all_zeros_mac, 4478 dst->remote_ip, 4479 vxlan->cfg.dst_port, 4480 dst->remote_vni, 4481 dst->remote_vni, 4482 dst->remote_ifindex, 4483 true); 4484 spin_unlock_bh(&vxlan->hash_lock); 4485 4486 /* If vni filtering device, also update fdb entries of 4487 * all vnis that were using default remote ip 4488 */ 4489 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER) { 4490 err = vxlan_vnilist_update_group(vxlan, &dst->remote_ip, 4491 &conf.remote_ip, extack); 4492 if (err) { 4493 netdev_adjacent_change_abort(dst->remote_dev, 4494 lowerdev, dev); 4495 return err; 4496 } 4497 } 4498 } 4499 4500 if (change_igmp && vxlan_addr_multicast(&dst->remote_ip)) 4501 err = vxlan_multicast_leave(vxlan); 4502 4503 if (netif_running(dev) && conf.age_interval != vxlan->cfg.age_interval) 4504 mod_timer(&vxlan->age_timer, jiffies); 4505 4506 netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev); 4507 if (lowerdev && lowerdev != dst->remote_dev) 4508 dst->remote_dev = lowerdev; 4509 vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true); 4510 4511 if (!err && change_igmp && 4512 vxlan_addr_multicast(&dst->remote_ip)) 4513 err = vxlan_multicast_join(vxlan); 4514 4515 return err; 4516 } 4517 4518 static void vxlan_dellink(struct net_device *dev, struct list_head *head) 4519 { 4520 struct vxlan_dev *vxlan = netdev_priv(dev); 4521 struct vxlan_fdb_flush_desc desc = {}; 4522 4523 vxlan_flush(vxlan, &desc); 4524 4525 list_del(&vxlan->next); 4526 unregister_netdevice_queue(dev, head); 4527 if (vxlan->default_dst.remote_dev) 4528 netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev); 4529 } 4530 4531 static size_t vxlan_get_size(const struct net_device *dev) 4532 { 4533 return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */ 4534 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */ 4535 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */ 4536 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */ 4537 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */ 4538 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */ 4539 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */ 4540 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */ 4541 nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */ 4542 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LABEL_POLICY */ 4543 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */ 4544 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */ 4545 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */ 4546 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */ 4547 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */ 4548 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */ 4549 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */ 4550 nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */ 4551 nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */ 4552 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */ 4553 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */ 4554 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */ 4555 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */ 4556 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */ 4557 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LOCALBYPASS */ 4558 /* IFLA_VXLAN_PORT_RANGE */ 4559 nla_total_size(sizeof(struct ifla_vxlan_port_range)) + 4560 nla_total_size(0) + /* IFLA_VXLAN_GBP */ 4561 nla_total_size(0) + /* IFLA_VXLAN_GPE */ 4562 nla_total_size(0) + /* IFLA_VXLAN_REMCSUM_NOPARTIAL */ 4563 nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_VNIFILTER */ 4564 /* IFLA_VXLAN_RESERVED_BITS */ 4565 nla_total_size(sizeof(struct vxlanhdr)) + 4566 0; 4567 } 4568 4569 static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev) 4570 { 4571 const struct vxlan_dev *vxlan = netdev_priv(dev); 4572 const struct vxlan_rdst *dst = &vxlan->default_dst; 4573 struct ifla_vxlan_port_range ports = { 4574 .low = htons(vxlan->cfg.port_min), 4575 .high = htons(vxlan->cfg.port_max), 4576 }; 4577 4578 if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni))) 4579 goto nla_put_failure; 4580 4581 if (!vxlan_addr_any(&dst->remote_ip)) { 4582 if (dst->remote_ip.sa.sa_family == AF_INET) { 4583 if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP, 4584 dst->remote_ip.sin.sin_addr.s_addr)) 4585 goto nla_put_failure; 4586 #if IS_ENABLED(CONFIG_IPV6) 4587 } else { 4588 if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6, 4589 &dst->remote_ip.sin6.sin6_addr)) 4590 goto nla_put_failure; 4591 #endif 4592 } 4593 } 4594 4595 if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex)) 4596 goto nla_put_failure; 4597 4598 if (!vxlan_addr_any(&vxlan->cfg.saddr)) { 4599 if (vxlan->cfg.saddr.sa.sa_family == AF_INET) { 4600 if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL, 4601 vxlan->cfg.saddr.sin.sin_addr.s_addr)) 4602 goto nla_put_failure; 4603 #if IS_ENABLED(CONFIG_IPV6) 4604 } else { 4605 if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6, 4606 &vxlan->cfg.saddr.sin6.sin6_addr)) 4607 goto nla_put_failure; 4608 #endif 4609 } 4610 } 4611 4612 if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) || 4613 nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT, 4614 !!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) || 4615 nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) || 4616 nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) || 4617 nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) || 4618 nla_put_u32(skb, IFLA_VXLAN_LABEL_POLICY, vxlan->cfg.label_policy) || 4619 nla_put_u8(skb, IFLA_VXLAN_LEARNING, 4620 !!(vxlan->cfg.flags & VXLAN_F_LEARN)) || 4621 nla_put_u8(skb, IFLA_VXLAN_PROXY, 4622 !!(vxlan->cfg.flags & VXLAN_F_PROXY)) || 4623 nla_put_u8(skb, IFLA_VXLAN_RSC, 4624 !!(vxlan->cfg.flags & VXLAN_F_RSC)) || 4625 nla_put_u8(skb, IFLA_VXLAN_L2MISS, 4626 !!(vxlan->cfg.flags & VXLAN_F_L2MISS)) || 4627 nla_put_u8(skb, IFLA_VXLAN_L3MISS, 4628 !!(vxlan->cfg.flags & VXLAN_F_L3MISS)) || 4629 nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA, 4630 !!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) || 4631 nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) || 4632 nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) || 4633 nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) || 4634 nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM, 4635 !(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) || 4636 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, 4637 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) || 4638 nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 4639 !!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) || 4640 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX, 4641 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) || 4642 nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX, 4643 !!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)) || 4644 nla_put_u8(skb, IFLA_VXLAN_LOCALBYPASS, 4645 !!(vxlan->cfg.flags & VXLAN_F_LOCALBYPASS))) 4646 goto nla_put_failure; 4647 4648 if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports)) 4649 goto nla_put_failure; 4650 4651 if (vxlan->cfg.flags & VXLAN_F_GBP && 4652 nla_put_flag(skb, IFLA_VXLAN_GBP)) 4653 goto nla_put_failure; 4654 4655 if (vxlan->cfg.flags & VXLAN_F_GPE && 4656 nla_put_flag(skb, IFLA_VXLAN_GPE)) 4657 goto nla_put_failure; 4658 4659 if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL && 4660 nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL)) 4661 goto nla_put_failure; 4662 4663 if (vxlan->cfg.flags & VXLAN_F_VNIFILTER && 4664 nla_put_u8(skb, IFLA_VXLAN_VNIFILTER, 4665 !!(vxlan->cfg.flags & VXLAN_F_VNIFILTER))) 4666 goto nla_put_failure; 4667 4668 if (nla_put(skb, IFLA_VXLAN_RESERVED_BITS, 4669 sizeof(vxlan->cfg.reserved_bits), 4670 &vxlan->cfg.reserved_bits)) 4671 goto nla_put_failure; 4672 4673 return 0; 4674 4675 nla_put_failure: 4676 return -EMSGSIZE; 4677 } 4678 4679 static struct net *vxlan_get_link_net(const struct net_device *dev) 4680 { 4681 struct vxlan_dev *vxlan = netdev_priv(dev); 4682 4683 return READ_ONCE(vxlan->net); 4684 } 4685 4686 static struct rtnl_link_ops vxlan_link_ops __read_mostly = { 4687 .kind = "vxlan", 4688 .maxtype = IFLA_VXLAN_MAX, 4689 .policy = vxlan_policy, 4690 .priv_size = sizeof(struct vxlan_dev), 4691 .setup = vxlan_setup, 4692 .validate = vxlan_validate, 4693 .newlink = vxlan_newlink, 4694 .changelink = vxlan_changelink, 4695 .dellink = vxlan_dellink, 4696 .get_size = vxlan_get_size, 4697 .fill_info = vxlan_fill_info, 4698 .get_link_net = vxlan_get_link_net, 4699 }; 4700 4701 struct net_device *vxlan_dev_create(struct net *net, const char *name, 4702 u8 name_assign_type, 4703 struct vxlan_config *conf) 4704 { 4705 struct nlattr *tb[IFLA_MAX + 1]; 4706 struct net_device *dev; 4707 int err; 4708 4709 memset(&tb, 0, sizeof(tb)); 4710 4711 dev = rtnl_create_link(net, name, name_assign_type, 4712 &vxlan_link_ops, tb, NULL); 4713 if (IS_ERR(dev)) 4714 return dev; 4715 4716 err = __vxlan_dev_create(net, dev, conf, NULL); 4717 if (err < 0) { 4718 free_netdev(dev); 4719 return ERR_PTR(err); 4720 } 4721 4722 err = rtnl_configure_link(dev, NULL, 0, NULL); 4723 if (err < 0) { 4724 LIST_HEAD(list_kill); 4725 4726 vxlan_dellink(dev, &list_kill); 4727 unregister_netdevice_many(&list_kill); 4728 return ERR_PTR(err); 4729 } 4730 4731 return dev; 4732 } 4733 EXPORT_SYMBOL_GPL(vxlan_dev_create); 4734 4735 static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn, 4736 struct net_device *dev) 4737 { 4738 struct vxlan_dev *vxlan, *next; 4739 LIST_HEAD(list_kill); 4740 4741 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) { 4742 struct vxlan_rdst *dst = &vxlan->default_dst; 4743 4744 /* In case we created vxlan device with carrier 4745 * and we loose the carrier due to module unload 4746 * we also need to remove vxlan device. In other 4747 * cases, it's not necessary and remote_ifindex 4748 * is 0 here, so no matches. 4749 */ 4750 if (dst->remote_ifindex == dev->ifindex) 4751 vxlan_dellink(vxlan->dev, &list_kill); 4752 } 4753 4754 unregister_netdevice_many(&list_kill); 4755 } 4756 4757 static int vxlan_netdevice_event(struct notifier_block *unused, 4758 unsigned long event, void *ptr) 4759 { 4760 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 4761 struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id); 4762 4763 if (event == NETDEV_UNREGISTER) 4764 vxlan_handle_lowerdev_unregister(vn, dev); 4765 else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 4766 vxlan_offload_rx_ports(dev, true); 4767 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 4768 vxlan_offload_rx_ports(dev, false); 4769 4770 return NOTIFY_DONE; 4771 } 4772 4773 static struct notifier_block vxlan_notifier_block __read_mostly = { 4774 .notifier_call = vxlan_netdevice_event, 4775 }; 4776 4777 static void 4778 vxlan_fdb_offloaded_set(struct net_device *dev, 4779 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4780 { 4781 struct vxlan_dev *vxlan = netdev_priv(dev); 4782 struct vxlan_rdst *rdst; 4783 struct vxlan_fdb *f; 4784 4785 spin_lock_bh(&vxlan->hash_lock); 4786 4787 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4788 if (!f) 4789 goto out; 4790 4791 rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip, 4792 fdb_info->remote_port, 4793 fdb_info->remote_vni, 4794 fdb_info->remote_ifindex); 4795 if (!rdst) 4796 goto out; 4797 4798 rdst->offloaded = fdb_info->offloaded; 4799 4800 out: 4801 spin_unlock_bh(&vxlan->hash_lock); 4802 } 4803 4804 static int 4805 vxlan_fdb_external_learn_add(struct net_device *dev, 4806 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4807 { 4808 struct vxlan_dev *vxlan = netdev_priv(dev); 4809 struct netlink_ext_ack *extack; 4810 int err; 4811 4812 extack = switchdev_notifier_info_to_extack(&fdb_info->info); 4813 4814 spin_lock_bh(&vxlan->hash_lock); 4815 err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip, 4816 NUD_REACHABLE, 4817 NLM_F_CREATE | NLM_F_REPLACE, 4818 fdb_info->remote_port, 4819 fdb_info->vni, 4820 fdb_info->remote_vni, 4821 fdb_info->remote_ifindex, 4822 NTF_USE | NTF_SELF | NTF_EXT_LEARNED, 4823 0, false, extack); 4824 spin_unlock_bh(&vxlan->hash_lock); 4825 4826 return err; 4827 } 4828 4829 static int 4830 vxlan_fdb_external_learn_del(struct net_device *dev, 4831 struct switchdev_notifier_vxlan_fdb_info *fdb_info) 4832 { 4833 struct vxlan_dev *vxlan = netdev_priv(dev); 4834 struct vxlan_fdb *f; 4835 int err = 0; 4836 4837 spin_lock_bh(&vxlan->hash_lock); 4838 4839 f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni); 4840 if (!f) 4841 err = -ENOENT; 4842 else if (f->flags & NTF_EXT_LEARNED) 4843 err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr, 4844 fdb_info->remote_ip, 4845 fdb_info->remote_port, 4846 fdb_info->vni, 4847 fdb_info->remote_vni, 4848 fdb_info->remote_ifindex, 4849 false); 4850 4851 spin_unlock_bh(&vxlan->hash_lock); 4852 4853 return err; 4854 } 4855 4856 static int vxlan_switchdev_event(struct notifier_block *unused, 4857 unsigned long event, void *ptr) 4858 { 4859 struct net_device *dev = switchdev_notifier_info_to_dev(ptr); 4860 struct switchdev_notifier_vxlan_fdb_info *fdb_info; 4861 int err = 0; 4862 4863 switch (event) { 4864 case SWITCHDEV_VXLAN_FDB_OFFLOADED: 4865 vxlan_fdb_offloaded_set(dev, ptr); 4866 break; 4867 case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE: 4868 fdb_info = ptr; 4869 err = vxlan_fdb_external_learn_add(dev, fdb_info); 4870 if (err) { 4871 err = notifier_from_errno(err); 4872 break; 4873 } 4874 fdb_info->offloaded = true; 4875 vxlan_fdb_offloaded_set(dev, fdb_info); 4876 break; 4877 case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE: 4878 fdb_info = ptr; 4879 err = vxlan_fdb_external_learn_del(dev, fdb_info); 4880 if (err) { 4881 err = notifier_from_errno(err); 4882 break; 4883 } 4884 fdb_info->offloaded = false; 4885 vxlan_fdb_offloaded_set(dev, fdb_info); 4886 break; 4887 } 4888 4889 return err; 4890 } 4891 4892 static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = { 4893 .notifier_call = vxlan_switchdev_event, 4894 }; 4895 4896 static void vxlan_fdb_nh_flush(struct nexthop *nh) 4897 { 4898 struct vxlan_fdb *fdb; 4899 struct vxlan_dev *vxlan; 4900 4901 rcu_read_lock(); 4902 list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) { 4903 vxlan = rcu_dereference(fdb->vdev); 4904 WARN_ON(!vxlan); 4905 spin_lock_bh(&vxlan->hash_lock); 4906 if (!hlist_unhashed(&fdb->fdb_node)) 4907 vxlan_fdb_destroy(vxlan, fdb, false, false); 4908 spin_unlock_bh(&vxlan->hash_lock); 4909 } 4910 rcu_read_unlock(); 4911 } 4912 4913 static int vxlan_nexthop_event(struct notifier_block *nb, 4914 unsigned long event, void *ptr) 4915 { 4916 struct nh_notifier_info *info = ptr; 4917 struct nexthop *nh; 4918 4919 if (event != NEXTHOP_EVENT_DEL) 4920 return NOTIFY_DONE; 4921 4922 nh = nexthop_find_by_id(info->net, info->id); 4923 if (!nh) 4924 return NOTIFY_DONE; 4925 4926 vxlan_fdb_nh_flush(nh); 4927 4928 return NOTIFY_DONE; 4929 } 4930 4931 static __net_init int vxlan_init_net(struct net *net) 4932 { 4933 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4934 unsigned int h; 4935 4936 INIT_LIST_HEAD(&vn->vxlan_list); 4937 vn->nexthop_notifier_block.notifier_call = vxlan_nexthop_event; 4938 4939 for (h = 0; h < PORT_HASH_SIZE; ++h) 4940 INIT_HLIST_HEAD(&vn->sock_list[h]); 4941 4942 return register_nexthop_notifier(net, &vn->nexthop_notifier_block, 4943 NULL); 4944 } 4945 4946 static void __net_exit vxlan_destroy_tunnels(struct vxlan_net *vn, 4947 struct list_head *dev_to_kill) 4948 { 4949 struct vxlan_dev *vxlan, *next; 4950 4951 list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) 4952 vxlan_dellink(vxlan->dev, dev_to_kill); 4953 } 4954 4955 static void __net_exit vxlan_exit_rtnl(struct net *net, 4956 struct list_head *dev_to_kill) 4957 { 4958 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4959 4960 ASSERT_RTNL_NET(net); 4961 4962 __unregister_nexthop_notifier(net, &vn->nexthop_notifier_block); 4963 vxlan_destroy_tunnels(vn, dev_to_kill); 4964 } 4965 4966 static void __net_exit vxlan_exit_net(struct net *net) 4967 { 4968 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 4969 unsigned int h; 4970 4971 for (h = 0; h < PORT_HASH_SIZE; ++h) 4972 WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h])); 4973 } 4974 4975 static struct pernet_operations vxlan_net_ops = { 4976 .init = vxlan_init_net, 4977 .exit_rtnl = vxlan_exit_rtnl, 4978 .exit = vxlan_exit_net, 4979 .id = &vxlan_net_id, 4980 .size = sizeof(struct vxlan_net), 4981 }; 4982 4983 static int __init vxlan_init_module(void) 4984 { 4985 int rc; 4986 4987 rc = register_pernet_subsys(&vxlan_net_ops); 4988 if (rc) 4989 goto out1; 4990 4991 rc = register_netdevice_notifier(&vxlan_notifier_block); 4992 if (rc) 4993 goto out2; 4994 4995 rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block); 4996 if (rc) 4997 goto out3; 4998 4999 rc = rtnl_link_register(&vxlan_link_ops); 5000 if (rc) 5001 goto out4; 5002 5003 rc = vxlan_vnifilter_init(); 5004 if (rc) 5005 goto out5; 5006 5007 return 0; 5008 out5: 5009 rtnl_link_unregister(&vxlan_link_ops); 5010 out4: 5011 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 5012 out3: 5013 unregister_netdevice_notifier(&vxlan_notifier_block); 5014 out2: 5015 unregister_pernet_subsys(&vxlan_net_ops); 5016 out1: 5017 return rc; 5018 } 5019 late_initcall(vxlan_init_module); 5020 5021 static void __exit vxlan_cleanup_module(void) 5022 { 5023 vxlan_vnifilter_uninit(); 5024 rtnl_link_unregister(&vxlan_link_ops); 5025 unregister_switchdev_notifier(&vxlan_switchdev_notifier_block); 5026 unregister_netdevice_notifier(&vxlan_notifier_block); 5027 unregister_pernet_subsys(&vxlan_net_ops); 5028 /* rcu_barrier() is called by netns */ 5029 } 5030 module_exit(vxlan_cleanup_module); 5031 5032 MODULE_LICENSE("GPL"); 5033 MODULE_VERSION(VXLAN_VERSION); 5034 MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>"); 5035 MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic"); 5036 MODULE_ALIAS_RTNL_LINK("vxlan"); 5037