1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * GENEVE: Generic Network Virtualization Encapsulation 4 * 5 * Copyright (c) 2015 Red Hat, Inc. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/etherdevice.h> 13 #include <linux/hash.h> 14 #include <net/ipv6_stubs.h> 15 #include <net/dst_metadata.h> 16 #include <net/gro_cells.h> 17 #include <net/rtnetlink.h> 18 #include <net/geneve.h> 19 #include <net/protocol.h> 20 21 #define GENEVE_NETDEV_VER "0.6" 22 23 #define GENEVE_N_VID (1u << 24) 24 #define GENEVE_VID_MASK (GENEVE_N_VID - 1) 25 26 #define VNI_HASH_BITS 10 27 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 28 29 static bool log_ecn_error = true; 30 module_param(log_ecn_error, bool, 0644); 31 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 32 33 #define GENEVE_VER 0 34 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) 35 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN) 36 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN) 37 38 /* per-network namespace private data for this module */ 39 struct geneve_net { 40 struct list_head geneve_list; 41 struct list_head sock_list; 42 }; 43 44 static unsigned int geneve_net_id; 45 46 struct geneve_dev_node { 47 struct hlist_node hlist; 48 struct geneve_dev *geneve; 49 }; 50 51 struct geneve_config { 52 struct ip_tunnel_info info; 53 bool collect_md; 54 bool use_udp6_rx_checksums; 55 bool ttl_inherit; 56 enum ifla_geneve_df df; 57 }; 58 59 /* Pseudo network device */ 60 struct geneve_dev { 61 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ 62 #if IS_ENABLED(CONFIG_IPV6) 63 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ 64 #endif 65 struct net *net; /* netns for packet i/o */ 66 struct net_device *dev; /* netdev for geneve tunnel */ 67 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 68 #if IS_ENABLED(CONFIG_IPV6) 69 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ 70 #endif 71 struct list_head next; /* geneve's per namespace list */ 72 struct gro_cells gro_cells; 73 struct geneve_config cfg; 74 }; 75 76 struct geneve_sock { 77 bool collect_md; 78 struct list_head list; 79 struct socket *sock; 80 struct rcu_head rcu; 81 int refcnt; 82 struct hlist_head vni_list[VNI_HASH_SIZE]; 83 }; 84 85 static inline __u32 geneve_net_vni_hash(u8 vni[3]) 86 { 87 __u32 vnid; 88 89 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 90 return hash_32(vnid, VNI_HASH_BITS); 91 } 92 93 static __be64 vni_to_tunnel_id(const __u8 *vni) 94 { 95 #ifdef __BIG_ENDIAN 96 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 97 #else 98 return (__force __be64)(((__force u64)vni[0] << 40) | 99 ((__force u64)vni[1] << 48) | 100 ((__force u64)vni[2] << 56)); 101 #endif 102 } 103 104 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 105 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 106 { 107 #ifdef __BIG_ENDIAN 108 vni[0] = (__force __u8)(tun_id >> 16); 109 vni[1] = (__force __u8)(tun_id >> 8); 110 vni[2] = (__force __u8)tun_id; 111 #else 112 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 113 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 114 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 115 #endif 116 } 117 118 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) 119 { 120 return !memcmp(vni, &tun_id[5], 3); 121 } 122 123 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 124 { 125 return gs->sock->sk->sk_family; 126 } 127 128 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 129 __be32 addr, u8 vni[]) 130 { 131 struct hlist_head *vni_list_head; 132 struct geneve_dev_node *node; 133 __u32 hash; 134 135 /* Find the device for this VNI */ 136 hash = geneve_net_vni_hash(vni); 137 vni_list_head = &gs->vni_list[hash]; 138 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 139 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 140 addr == node->geneve->cfg.info.key.u.ipv4.dst) 141 return node->geneve; 142 } 143 return NULL; 144 } 145 146 #if IS_ENABLED(CONFIG_IPV6) 147 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 148 struct in6_addr addr6, u8 vni[]) 149 { 150 struct hlist_head *vni_list_head; 151 struct geneve_dev_node *node; 152 __u32 hash; 153 154 /* Find the device for this VNI */ 155 hash = geneve_net_vni_hash(vni); 156 vni_list_head = &gs->vni_list[hash]; 157 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 158 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 159 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst)) 160 return node->geneve; 161 } 162 return NULL; 163 } 164 #endif 165 166 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 167 { 168 return (struct genevehdr *)(udp_hdr(skb) + 1); 169 } 170 171 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 172 struct sk_buff *skb) 173 { 174 static u8 zero_vni[3]; 175 u8 *vni; 176 177 if (geneve_get_sk_family(gs) == AF_INET) { 178 struct iphdr *iph; 179 __be32 addr; 180 181 iph = ip_hdr(skb); /* outer IP header... */ 182 183 if (gs->collect_md) { 184 vni = zero_vni; 185 addr = 0; 186 } else { 187 vni = geneve_hdr(skb)->vni; 188 addr = iph->saddr; 189 } 190 191 return geneve_lookup(gs, addr, vni); 192 #if IS_ENABLED(CONFIG_IPV6) 193 } else if (geneve_get_sk_family(gs) == AF_INET6) { 194 static struct in6_addr zero_addr6; 195 struct ipv6hdr *ip6h; 196 struct in6_addr addr6; 197 198 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 199 200 if (gs->collect_md) { 201 vni = zero_vni; 202 addr6 = zero_addr6; 203 } else { 204 vni = geneve_hdr(skb)->vni; 205 addr6 = ip6h->saddr; 206 } 207 208 return geneve6_lookup(gs, addr6, vni); 209 #endif 210 } 211 return NULL; 212 } 213 214 /* geneve receive/decap routine */ 215 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 216 struct sk_buff *skb) 217 { 218 struct genevehdr *gnvh = geneve_hdr(skb); 219 struct metadata_dst *tun_dst = NULL; 220 struct pcpu_sw_netstats *stats; 221 unsigned int len; 222 int err = 0; 223 void *oiph; 224 225 if (ip_tunnel_collect_metadata() || gs->collect_md) { 226 __be16 flags; 227 228 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | 229 (gnvh->oam ? TUNNEL_OAM : 0) | 230 (gnvh->critical ? TUNNEL_CRIT_OPT : 0); 231 232 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 233 vni_to_tunnel_id(gnvh->vni), 234 gnvh->opt_len * 4); 235 if (!tun_dst) { 236 geneve->dev->stats.rx_dropped++; 237 goto drop; 238 } 239 /* Update tunnel dst according to Geneve options. */ 240 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 241 gnvh->options, gnvh->opt_len * 4, 242 TUNNEL_GENEVE_OPT); 243 } else { 244 /* Drop packets w/ critical options, 245 * since we don't support any... 246 */ 247 if (gnvh->critical) { 248 geneve->dev->stats.rx_frame_errors++; 249 geneve->dev->stats.rx_errors++; 250 goto drop; 251 } 252 } 253 254 skb_reset_mac_header(skb); 255 skb->protocol = eth_type_trans(skb, geneve->dev); 256 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 257 258 if (tun_dst) 259 skb_dst_set(skb, &tun_dst->dst); 260 261 /* Ignore packet loops (and multicast echo) */ 262 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) { 263 geneve->dev->stats.rx_errors++; 264 goto drop; 265 } 266 267 oiph = skb_network_header(skb); 268 skb_reset_network_header(skb); 269 270 if (geneve_get_sk_family(gs) == AF_INET) 271 err = IP_ECN_decapsulate(oiph, skb); 272 #if IS_ENABLED(CONFIG_IPV6) 273 else 274 err = IP6_ECN_decapsulate(oiph, skb); 275 #endif 276 277 if (unlikely(err)) { 278 if (log_ecn_error) { 279 if (geneve_get_sk_family(gs) == AF_INET) 280 net_info_ratelimited("non-ECT from %pI4 " 281 "with TOS=%#x\n", 282 &((struct iphdr *)oiph)->saddr, 283 ((struct iphdr *)oiph)->tos); 284 #if IS_ENABLED(CONFIG_IPV6) 285 else 286 net_info_ratelimited("non-ECT from %pI6\n", 287 &((struct ipv6hdr *)oiph)->saddr); 288 #endif 289 } 290 if (err > 1) { 291 ++geneve->dev->stats.rx_frame_errors; 292 ++geneve->dev->stats.rx_errors; 293 goto drop; 294 } 295 } 296 297 len = skb->len; 298 err = gro_cells_receive(&geneve->gro_cells, skb); 299 if (likely(err == NET_RX_SUCCESS)) { 300 stats = this_cpu_ptr(geneve->dev->tstats); 301 u64_stats_update_begin(&stats->syncp); 302 stats->rx_packets++; 303 stats->rx_bytes += len; 304 u64_stats_update_end(&stats->syncp); 305 } 306 return; 307 drop: 308 /* Consume bad packet */ 309 kfree_skb(skb); 310 } 311 312 /* Setup stats when device is created */ 313 static int geneve_init(struct net_device *dev) 314 { 315 struct geneve_dev *geneve = netdev_priv(dev); 316 int err; 317 318 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 319 if (!dev->tstats) 320 return -ENOMEM; 321 322 err = gro_cells_init(&geneve->gro_cells, dev); 323 if (err) { 324 free_percpu(dev->tstats); 325 return err; 326 } 327 328 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 329 if (err) { 330 free_percpu(dev->tstats); 331 gro_cells_destroy(&geneve->gro_cells); 332 return err; 333 } 334 return 0; 335 } 336 337 static void geneve_uninit(struct net_device *dev) 338 { 339 struct geneve_dev *geneve = netdev_priv(dev); 340 341 dst_cache_destroy(&geneve->cfg.info.dst_cache); 342 gro_cells_destroy(&geneve->gro_cells); 343 free_percpu(dev->tstats); 344 } 345 346 /* Callback from net/ipv4/udp.c to receive packets */ 347 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 348 { 349 struct genevehdr *geneveh; 350 struct geneve_dev *geneve; 351 struct geneve_sock *gs; 352 int opts_len; 353 354 /* Need UDP and Geneve header to be present */ 355 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 356 goto drop; 357 358 /* Return packets with reserved bits set */ 359 geneveh = geneve_hdr(skb); 360 if (unlikely(geneveh->ver != GENEVE_VER)) 361 goto drop; 362 363 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) 364 goto drop; 365 366 gs = rcu_dereference_sk_user_data(sk); 367 if (!gs) 368 goto drop; 369 370 geneve = geneve_lookup_skb(gs, skb); 371 if (!geneve) 372 goto drop; 373 374 opts_len = geneveh->opt_len * 4; 375 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, 376 htons(ETH_P_TEB), 377 !net_eq(geneve->net, dev_net(geneve->dev)))) { 378 geneve->dev->stats.rx_dropped++; 379 goto drop; 380 } 381 382 geneve_rx(geneve, gs, skb); 383 return 0; 384 385 drop: 386 /* Consume bad packet */ 387 kfree_skb(skb); 388 return 0; 389 } 390 391 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 392 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 393 { 394 struct genevehdr *geneveh; 395 struct geneve_sock *gs; 396 u8 zero_vni[3] = { 0 }; 397 u8 *vni = zero_vni; 398 399 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 400 return -EINVAL; 401 402 geneveh = geneve_hdr(skb); 403 if (geneveh->ver != GENEVE_VER) 404 return -EINVAL; 405 406 if (geneveh->proto_type != htons(ETH_P_TEB)) 407 return -EINVAL; 408 409 gs = rcu_dereference_sk_user_data(sk); 410 if (!gs) 411 return -ENOENT; 412 413 if (geneve_get_sk_family(gs) == AF_INET) { 414 struct iphdr *iph = ip_hdr(skb); 415 __be32 addr4 = 0; 416 417 if (!gs->collect_md) { 418 vni = geneve_hdr(skb)->vni; 419 addr4 = iph->daddr; 420 } 421 422 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 423 } 424 425 #if IS_ENABLED(CONFIG_IPV6) 426 if (geneve_get_sk_family(gs) == AF_INET6) { 427 struct ipv6hdr *ip6h = ipv6_hdr(skb); 428 struct in6_addr addr6; 429 430 memset(&addr6, 0, sizeof(struct in6_addr)); 431 432 if (!gs->collect_md) { 433 vni = geneve_hdr(skb)->vni; 434 addr6 = ip6h->daddr; 435 } 436 437 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 438 } 439 #endif 440 441 return -EPFNOSUPPORT; 442 } 443 444 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 445 __be16 port, bool ipv6_rx_csum) 446 { 447 struct socket *sock; 448 struct udp_port_cfg udp_conf; 449 int err; 450 451 memset(&udp_conf, 0, sizeof(udp_conf)); 452 453 if (ipv6) { 454 udp_conf.family = AF_INET6; 455 udp_conf.ipv6_v6only = 1; 456 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 457 } else { 458 udp_conf.family = AF_INET; 459 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 460 } 461 462 udp_conf.local_udp_port = port; 463 464 /* Open UDP socket */ 465 err = udp_sock_create(net, &udp_conf, &sock); 466 if (err < 0) 467 return ERR_PTR(err); 468 469 return sock; 470 } 471 472 static int geneve_hlen(struct genevehdr *gh) 473 { 474 return sizeof(*gh) + gh->opt_len * 4; 475 } 476 477 static struct sk_buff *geneve_gro_receive(struct sock *sk, 478 struct list_head *head, 479 struct sk_buff *skb) 480 { 481 struct sk_buff *pp = NULL; 482 struct sk_buff *p; 483 struct genevehdr *gh, *gh2; 484 unsigned int hlen, gh_len, off_gnv; 485 const struct packet_offload *ptype; 486 __be16 type; 487 int flush = 1; 488 489 off_gnv = skb_gro_offset(skb); 490 hlen = off_gnv + sizeof(*gh); 491 gh = skb_gro_header_fast(skb, off_gnv); 492 if (skb_gro_header_hard(skb, hlen)) { 493 gh = skb_gro_header_slow(skb, hlen, off_gnv); 494 if (unlikely(!gh)) 495 goto out; 496 } 497 498 if (gh->ver != GENEVE_VER || gh->oam) 499 goto out; 500 gh_len = geneve_hlen(gh); 501 502 hlen = off_gnv + gh_len; 503 if (skb_gro_header_hard(skb, hlen)) { 504 gh = skb_gro_header_slow(skb, hlen, off_gnv); 505 if (unlikely(!gh)) 506 goto out; 507 } 508 509 list_for_each_entry(p, head, list) { 510 if (!NAPI_GRO_CB(p)->same_flow) 511 continue; 512 513 gh2 = (struct genevehdr *)(p->data + off_gnv); 514 if (gh->opt_len != gh2->opt_len || 515 memcmp(gh, gh2, gh_len)) { 516 NAPI_GRO_CB(p)->same_flow = 0; 517 continue; 518 } 519 } 520 521 type = gh->proto_type; 522 523 rcu_read_lock(); 524 ptype = gro_find_receive_by_type(type); 525 if (!ptype) 526 goto out_unlock; 527 528 skb_gro_pull(skb, gh_len); 529 skb_gro_postpull_rcsum(skb, gh, gh_len); 530 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 531 flush = 0; 532 533 out_unlock: 534 rcu_read_unlock(); 535 out: 536 skb_gro_flush_final(skb, pp, flush); 537 538 return pp; 539 } 540 541 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 542 int nhoff) 543 { 544 struct genevehdr *gh; 545 struct packet_offload *ptype; 546 __be16 type; 547 int gh_len; 548 int err = -ENOSYS; 549 550 gh = (struct genevehdr *)(skb->data + nhoff); 551 gh_len = geneve_hlen(gh); 552 type = gh->proto_type; 553 554 rcu_read_lock(); 555 ptype = gro_find_complete_by_type(type); 556 if (ptype) 557 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 558 559 rcu_read_unlock(); 560 561 skb_set_inner_mac_header(skb, nhoff + gh_len); 562 563 return err; 564 } 565 566 /* Create new listen socket if needed */ 567 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 568 bool ipv6, bool ipv6_rx_csum) 569 { 570 struct geneve_net *gn = net_generic(net, geneve_net_id); 571 struct geneve_sock *gs; 572 struct socket *sock; 573 struct udp_tunnel_sock_cfg tunnel_cfg; 574 int h; 575 576 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 577 if (!gs) 578 return ERR_PTR(-ENOMEM); 579 580 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 581 if (IS_ERR(sock)) { 582 kfree(gs); 583 return ERR_CAST(sock); 584 } 585 586 gs->sock = sock; 587 gs->refcnt = 1; 588 for (h = 0; h < VNI_HASH_SIZE; ++h) 589 INIT_HLIST_HEAD(&gs->vni_list[h]); 590 591 /* Initialize the geneve udp offloads structure */ 592 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 593 594 /* Mark socket as an encapsulation socket */ 595 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 596 tunnel_cfg.sk_user_data = gs; 597 tunnel_cfg.encap_type = 1; 598 tunnel_cfg.gro_receive = geneve_gro_receive; 599 tunnel_cfg.gro_complete = geneve_gro_complete; 600 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 601 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 602 tunnel_cfg.encap_destroy = NULL; 603 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 604 list_add(&gs->list, &gn->sock_list); 605 return gs; 606 } 607 608 static void __geneve_sock_release(struct geneve_sock *gs) 609 { 610 if (!gs || --gs->refcnt) 611 return; 612 613 list_del(&gs->list); 614 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 615 udp_tunnel_sock_release(gs->sock); 616 kfree_rcu(gs, rcu); 617 } 618 619 static void geneve_sock_release(struct geneve_dev *geneve) 620 { 621 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 622 #if IS_ENABLED(CONFIG_IPV6) 623 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 624 625 rcu_assign_pointer(geneve->sock6, NULL); 626 #endif 627 628 rcu_assign_pointer(geneve->sock4, NULL); 629 synchronize_net(); 630 631 __geneve_sock_release(gs4); 632 #if IS_ENABLED(CONFIG_IPV6) 633 __geneve_sock_release(gs6); 634 #endif 635 } 636 637 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 638 sa_family_t family, 639 __be16 dst_port) 640 { 641 struct geneve_sock *gs; 642 643 list_for_each_entry(gs, &gn->sock_list, list) { 644 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 645 geneve_get_sk_family(gs) == family) { 646 return gs; 647 } 648 } 649 return NULL; 650 } 651 652 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 653 { 654 struct net *net = geneve->net; 655 struct geneve_net *gn = net_generic(net, geneve_net_id); 656 struct geneve_dev_node *node; 657 struct geneve_sock *gs; 658 __u8 vni[3]; 659 __u32 hash; 660 661 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 662 if (gs) { 663 gs->refcnt++; 664 goto out; 665 } 666 667 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 668 geneve->cfg.use_udp6_rx_checksums); 669 if (IS_ERR(gs)) 670 return PTR_ERR(gs); 671 672 out: 673 gs->collect_md = geneve->cfg.collect_md; 674 #if IS_ENABLED(CONFIG_IPV6) 675 if (ipv6) { 676 rcu_assign_pointer(geneve->sock6, gs); 677 node = &geneve->hlist6; 678 } else 679 #endif 680 { 681 rcu_assign_pointer(geneve->sock4, gs); 682 node = &geneve->hlist4; 683 } 684 node->geneve = geneve; 685 686 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 687 hash = geneve_net_vni_hash(vni); 688 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 689 return 0; 690 } 691 692 static int geneve_open(struct net_device *dev) 693 { 694 struct geneve_dev *geneve = netdev_priv(dev); 695 bool metadata = geneve->cfg.collect_md; 696 bool ipv4, ipv6; 697 int ret = 0; 698 699 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 700 ipv4 = !ipv6 || metadata; 701 #if IS_ENABLED(CONFIG_IPV6) 702 if (ipv6) { 703 ret = geneve_sock_add(geneve, true); 704 if (ret < 0 && ret != -EAFNOSUPPORT) 705 ipv4 = false; 706 } 707 #endif 708 if (ipv4) 709 ret = geneve_sock_add(geneve, false); 710 if (ret < 0) 711 geneve_sock_release(geneve); 712 713 return ret; 714 } 715 716 static int geneve_stop(struct net_device *dev) 717 { 718 struct geneve_dev *geneve = netdev_priv(dev); 719 720 hlist_del_init_rcu(&geneve->hlist4.hlist); 721 #if IS_ENABLED(CONFIG_IPV6) 722 hlist_del_init_rcu(&geneve->hlist6.hlist); 723 #endif 724 geneve_sock_release(geneve); 725 return 0; 726 } 727 728 static void geneve_build_header(struct genevehdr *geneveh, 729 const struct ip_tunnel_info *info) 730 { 731 geneveh->ver = GENEVE_VER; 732 geneveh->opt_len = info->options_len / 4; 733 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 734 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 735 geneveh->rsvd1 = 0; 736 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 737 geneveh->proto_type = htons(ETH_P_TEB); 738 geneveh->rsvd2 = 0; 739 740 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 741 ip_tunnel_info_opts_get(geneveh->options, info); 742 } 743 744 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 745 const struct ip_tunnel_info *info, 746 bool xnet, int ip_hdr_len) 747 { 748 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 749 struct genevehdr *gnvh; 750 int min_headroom; 751 int err; 752 753 skb_reset_mac_header(skb); 754 skb_scrub_packet(skb, xnet); 755 756 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 757 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 758 err = skb_cow_head(skb, min_headroom); 759 if (unlikely(err)) 760 goto free_dst; 761 762 err = udp_tunnel_handle_offloads(skb, udp_sum); 763 if (err) 764 goto free_dst; 765 766 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 767 geneve_build_header(gnvh, info); 768 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 769 return 0; 770 771 free_dst: 772 dst_release(dst); 773 return err; 774 } 775 776 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 777 struct net_device *dev, 778 struct geneve_sock *gs4, 779 struct flowi4 *fl4, 780 const struct ip_tunnel_info *info) 781 { 782 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 783 struct geneve_dev *geneve = netdev_priv(dev); 784 struct dst_cache *dst_cache; 785 struct rtable *rt = NULL; 786 __u8 tos; 787 788 if (!gs4) 789 return ERR_PTR(-EIO); 790 791 memset(fl4, 0, sizeof(*fl4)); 792 fl4->flowi4_mark = skb->mark; 793 fl4->flowi4_proto = IPPROTO_UDP; 794 fl4->daddr = info->key.u.ipv4.dst; 795 fl4->saddr = info->key.u.ipv4.src; 796 797 tos = info->key.tos; 798 if ((tos == 1) && !geneve->cfg.collect_md) { 799 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 800 use_cache = false; 801 } 802 fl4->flowi4_tos = RT_TOS(tos); 803 804 dst_cache = (struct dst_cache *)&info->dst_cache; 805 if (use_cache) { 806 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 807 if (rt) 808 return rt; 809 } 810 rt = ip_route_output_key(geneve->net, fl4); 811 if (IS_ERR(rt)) { 812 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 813 return ERR_PTR(-ENETUNREACH); 814 } 815 if (rt->dst.dev == dev) { /* is this necessary? */ 816 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 817 ip_rt_put(rt); 818 return ERR_PTR(-ELOOP); 819 } 820 if (use_cache) 821 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 822 return rt; 823 } 824 825 #if IS_ENABLED(CONFIG_IPV6) 826 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 827 struct net_device *dev, 828 struct geneve_sock *gs6, 829 struct flowi6 *fl6, 830 const struct ip_tunnel_info *info) 831 { 832 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 833 struct geneve_dev *geneve = netdev_priv(dev); 834 struct dst_entry *dst = NULL; 835 struct dst_cache *dst_cache; 836 __u8 prio; 837 838 if (!gs6) 839 return ERR_PTR(-EIO); 840 841 memset(fl6, 0, sizeof(*fl6)); 842 fl6->flowi6_mark = skb->mark; 843 fl6->flowi6_proto = IPPROTO_UDP; 844 fl6->daddr = info->key.u.ipv6.dst; 845 fl6->saddr = info->key.u.ipv6.src; 846 prio = info->key.tos; 847 if ((prio == 1) && !geneve->cfg.collect_md) { 848 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 849 use_cache = false; 850 } 851 852 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 853 info->key.label); 854 dst_cache = (struct dst_cache *)&info->dst_cache; 855 if (use_cache) { 856 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 857 if (dst) 858 return dst; 859 } 860 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, 861 NULL); 862 if (IS_ERR(dst)) { 863 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 864 return ERR_PTR(-ENETUNREACH); 865 } 866 if (dst->dev == dev) { /* is this necessary? */ 867 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 868 dst_release(dst); 869 return ERR_PTR(-ELOOP); 870 } 871 872 if (use_cache) 873 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 874 return dst; 875 } 876 #endif 877 878 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 879 struct geneve_dev *geneve, 880 const struct ip_tunnel_info *info) 881 { 882 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 883 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 884 const struct ip_tunnel_key *key = &info->key; 885 struct rtable *rt; 886 struct flowi4 fl4; 887 __u8 tos, ttl; 888 __be16 df = 0; 889 __be16 sport; 890 int err; 891 892 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info); 893 if (IS_ERR(rt)) 894 return PTR_ERR(rt); 895 896 err = skb_tunnel_check_pmtu(skb, &rt->dst, 897 GENEVE_IPV4_HLEN + info->options_len, 898 netif_is_any_bridge_port(dev)); 899 if (err < 0) { 900 dst_release(&rt->dst); 901 return err; 902 } else if (err) { 903 struct ip_tunnel_info *info; 904 905 info = skb_tunnel_info(skb); 906 if (info) { 907 info->key.u.ipv4.dst = fl4.saddr; 908 info->key.u.ipv4.src = fl4.daddr; 909 } 910 911 if (!pskb_may_pull(skb, ETH_HLEN)) { 912 dst_release(&rt->dst); 913 return -EINVAL; 914 } 915 916 skb->protocol = eth_type_trans(skb, geneve->dev); 917 netif_rx(skb); 918 dst_release(&rt->dst); 919 return -EMSGSIZE; 920 } 921 922 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 923 if (geneve->cfg.collect_md) { 924 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 925 ttl = key->ttl; 926 927 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 928 } else { 929 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); 930 if (geneve->cfg.ttl_inherit) 931 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 932 else 933 ttl = key->ttl; 934 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 935 936 if (geneve->cfg.df == GENEVE_DF_SET) { 937 df = htons(IP_DF); 938 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 939 struct ethhdr *eth = eth_hdr(skb); 940 941 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 942 df = htons(IP_DF); 943 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 944 struct iphdr *iph = ip_hdr(skb); 945 946 if (iph->frag_off & htons(IP_DF)) 947 df = htons(IP_DF); 948 } 949 } 950 } 951 952 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr)); 953 if (unlikely(err)) 954 return err; 955 956 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 957 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 958 !net_eq(geneve->net, dev_net(geneve->dev)), 959 !(info->key.tun_flags & TUNNEL_CSUM)); 960 return 0; 961 } 962 963 #if IS_ENABLED(CONFIG_IPV6) 964 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 965 struct geneve_dev *geneve, 966 const struct ip_tunnel_info *info) 967 { 968 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 969 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 970 const struct ip_tunnel_key *key = &info->key; 971 struct dst_entry *dst = NULL; 972 struct flowi6 fl6; 973 __u8 prio, ttl; 974 __be16 sport; 975 int err; 976 977 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info); 978 if (IS_ERR(dst)) 979 return PTR_ERR(dst); 980 981 err = skb_tunnel_check_pmtu(skb, dst, 982 GENEVE_IPV6_HLEN + info->options_len, 983 netif_is_any_bridge_port(dev)); 984 if (err < 0) { 985 dst_release(dst); 986 return err; 987 } else if (err) { 988 struct ip_tunnel_info *info = skb_tunnel_info(skb); 989 990 if (info) { 991 info->key.u.ipv6.dst = fl6.saddr; 992 info->key.u.ipv6.src = fl6.daddr; 993 } 994 995 if (!pskb_may_pull(skb, ETH_HLEN)) { 996 dst_release(dst); 997 return -EINVAL; 998 } 999 1000 skb->protocol = eth_type_trans(skb, geneve->dev); 1001 netif_rx(skb); 1002 dst_release(dst); 1003 return -EMSGSIZE; 1004 } 1005 1006 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 1007 if (geneve->cfg.collect_md) { 1008 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 1009 ttl = key->ttl; 1010 } else { 1011 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1012 ip_hdr(skb), skb); 1013 if (geneve->cfg.ttl_inherit) 1014 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1015 else 1016 ttl = key->ttl; 1017 ttl = ttl ? : ip6_dst_hoplimit(dst); 1018 } 1019 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr)); 1020 if (unlikely(err)) 1021 return err; 1022 1023 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1024 &fl6.saddr, &fl6.daddr, prio, ttl, 1025 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1026 !(info->key.tun_flags & TUNNEL_CSUM)); 1027 return 0; 1028 } 1029 #endif 1030 1031 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1032 { 1033 struct geneve_dev *geneve = netdev_priv(dev); 1034 struct ip_tunnel_info *info = NULL; 1035 int err; 1036 1037 if (geneve->cfg.collect_md) { 1038 info = skb_tunnel_info(skb); 1039 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1040 netdev_dbg(dev, "no tunnel metadata\n"); 1041 dev_kfree_skb(skb); 1042 dev->stats.tx_dropped++; 1043 return NETDEV_TX_OK; 1044 } 1045 } else { 1046 info = &geneve->cfg.info; 1047 } 1048 1049 rcu_read_lock(); 1050 #if IS_ENABLED(CONFIG_IPV6) 1051 if (info->mode & IP_TUNNEL_INFO_IPV6) 1052 err = geneve6_xmit_skb(skb, dev, geneve, info); 1053 else 1054 #endif 1055 err = geneve_xmit_skb(skb, dev, geneve, info); 1056 rcu_read_unlock(); 1057 1058 if (likely(!err)) 1059 return NETDEV_TX_OK; 1060 1061 if (err != -EMSGSIZE) 1062 dev_kfree_skb(skb); 1063 1064 if (err == -ELOOP) 1065 dev->stats.collisions++; 1066 else if (err == -ENETUNREACH) 1067 dev->stats.tx_carrier_errors++; 1068 1069 dev->stats.tx_errors++; 1070 return NETDEV_TX_OK; 1071 } 1072 1073 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1074 { 1075 if (new_mtu > dev->max_mtu) 1076 new_mtu = dev->max_mtu; 1077 else if (new_mtu < dev->min_mtu) 1078 new_mtu = dev->min_mtu; 1079 1080 dev->mtu = new_mtu; 1081 return 0; 1082 } 1083 1084 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1085 { 1086 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1087 struct geneve_dev *geneve = netdev_priv(dev); 1088 1089 if (ip_tunnel_info_af(info) == AF_INET) { 1090 struct rtable *rt; 1091 struct flowi4 fl4; 1092 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1093 1094 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info); 1095 if (IS_ERR(rt)) 1096 return PTR_ERR(rt); 1097 1098 ip_rt_put(rt); 1099 info->key.u.ipv4.src = fl4.saddr; 1100 #if IS_ENABLED(CONFIG_IPV6) 1101 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1102 struct dst_entry *dst; 1103 struct flowi6 fl6; 1104 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1105 1106 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info); 1107 if (IS_ERR(dst)) 1108 return PTR_ERR(dst); 1109 1110 dst_release(dst); 1111 info->key.u.ipv6.src = fl6.saddr; 1112 #endif 1113 } else { 1114 return -EINVAL; 1115 } 1116 1117 info->key.tp_src = udp_flow_src_port(geneve->net, skb, 1118 1, USHRT_MAX, true); 1119 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1120 return 0; 1121 } 1122 1123 static const struct net_device_ops geneve_netdev_ops = { 1124 .ndo_init = geneve_init, 1125 .ndo_uninit = geneve_uninit, 1126 .ndo_open = geneve_open, 1127 .ndo_stop = geneve_stop, 1128 .ndo_start_xmit = geneve_xmit, 1129 .ndo_get_stats64 = ip_tunnel_get_stats64, 1130 .ndo_change_mtu = geneve_change_mtu, 1131 .ndo_validate_addr = eth_validate_addr, 1132 .ndo_set_mac_address = eth_mac_addr, 1133 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1134 }; 1135 1136 static void geneve_get_drvinfo(struct net_device *dev, 1137 struct ethtool_drvinfo *drvinfo) 1138 { 1139 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1140 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1141 } 1142 1143 static const struct ethtool_ops geneve_ethtool_ops = { 1144 .get_drvinfo = geneve_get_drvinfo, 1145 .get_link = ethtool_op_get_link, 1146 }; 1147 1148 /* Info for udev, that this is a virtual tunnel endpoint */ 1149 static struct device_type geneve_type = { 1150 .name = "geneve", 1151 }; 1152 1153 /* Calls the ndo_udp_tunnel_add of the caller in order to 1154 * supply the listening GENEVE udp ports. Callers are expected 1155 * to implement the ndo_udp_tunnel_add. 1156 */ 1157 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1158 { 1159 struct net *net = dev_net(dev); 1160 struct geneve_net *gn = net_generic(net, geneve_net_id); 1161 struct geneve_sock *gs; 1162 1163 rcu_read_lock(); 1164 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1165 if (push) { 1166 udp_tunnel_push_rx_port(dev, gs->sock, 1167 UDP_TUNNEL_TYPE_GENEVE); 1168 } else { 1169 udp_tunnel_drop_rx_port(dev, gs->sock, 1170 UDP_TUNNEL_TYPE_GENEVE); 1171 } 1172 } 1173 rcu_read_unlock(); 1174 } 1175 1176 /* Initialize the device structure. */ 1177 static void geneve_setup(struct net_device *dev) 1178 { 1179 ether_setup(dev); 1180 1181 dev->netdev_ops = &geneve_netdev_ops; 1182 dev->ethtool_ops = &geneve_ethtool_ops; 1183 dev->needs_free_netdev = true; 1184 1185 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1186 1187 dev->features |= NETIF_F_LLTX; 1188 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1189 dev->features |= NETIF_F_RXCSUM; 1190 dev->features |= NETIF_F_GSO_SOFTWARE; 1191 1192 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 1193 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1194 1195 /* MTU range: 68 - (something less than 65535) */ 1196 dev->min_mtu = ETH_MIN_MTU; 1197 /* The max_mtu calculation does not take account of GENEVE 1198 * options, to avoid excluding potentially valid 1199 * configurations. This will be further reduced by IPvX hdr size. 1200 */ 1201 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1202 1203 netif_keep_dst(dev); 1204 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1205 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1206 eth_hw_addr_random(dev); 1207 } 1208 1209 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1210 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1211 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1212 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1213 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1214 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1215 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1216 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1217 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1218 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1219 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1220 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1221 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1222 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1223 }; 1224 1225 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1226 struct netlink_ext_ack *extack) 1227 { 1228 if (tb[IFLA_ADDRESS]) { 1229 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1230 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1231 "Provided link layer address is not Ethernet"); 1232 return -EINVAL; 1233 } 1234 1235 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1236 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1237 "Provided Ethernet address is not unicast"); 1238 return -EADDRNOTAVAIL; 1239 } 1240 } 1241 1242 if (!data) { 1243 NL_SET_ERR_MSG(extack, 1244 "Not enough attributes provided to perform the operation"); 1245 return -EINVAL; 1246 } 1247 1248 if (data[IFLA_GENEVE_ID]) { 1249 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1250 1251 if (vni >= GENEVE_N_VID) { 1252 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1253 "Geneve ID must be lower than 16777216"); 1254 return -ERANGE; 1255 } 1256 } 1257 1258 if (data[IFLA_GENEVE_DF]) { 1259 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1260 1261 if (df < 0 || df > GENEVE_DF_MAX) { 1262 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1263 "Invalid DF attribute"); 1264 return -EINVAL; 1265 } 1266 } 1267 1268 return 0; 1269 } 1270 1271 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1272 const struct ip_tunnel_info *info, 1273 bool *tun_on_same_port, 1274 bool *tun_collect_md) 1275 { 1276 struct geneve_dev *geneve, *t = NULL; 1277 1278 *tun_on_same_port = false; 1279 *tun_collect_md = false; 1280 list_for_each_entry(geneve, &gn->geneve_list, next) { 1281 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1282 *tun_collect_md = geneve->cfg.collect_md; 1283 *tun_on_same_port = true; 1284 } 1285 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1286 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1287 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1288 t = geneve; 1289 } 1290 return t; 1291 } 1292 1293 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1294 { 1295 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1296 info->key.ttl || info->key.label || info->key.tp_src || 1297 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1298 } 1299 1300 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1301 struct ip_tunnel_info *b) 1302 { 1303 if (ip_tunnel_info_af(a) == AF_INET) 1304 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1305 else 1306 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1307 } 1308 1309 static int geneve_configure(struct net *net, struct net_device *dev, 1310 struct netlink_ext_ack *extack, 1311 const struct geneve_config *cfg) 1312 { 1313 struct geneve_net *gn = net_generic(net, geneve_net_id); 1314 struct geneve_dev *t, *geneve = netdev_priv(dev); 1315 const struct ip_tunnel_info *info = &cfg->info; 1316 bool tun_collect_md, tun_on_same_port; 1317 int err, encap_len; 1318 1319 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1320 NL_SET_ERR_MSG(extack, 1321 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1322 return -EINVAL; 1323 } 1324 1325 geneve->net = net; 1326 geneve->dev = dev; 1327 1328 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1329 if (t) 1330 return -EBUSY; 1331 1332 /* make enough headroom for basic scenario */ 1333 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1334 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1335 encap_len += sizeof(struct iphdr); 1336 dev->max_mtu -= sizeof(struct iphdr); 1337 } else { 1338 encap_len += sizeof(struct ipv6hdr); 1339 dev->max_mtu -= sizeof(struct ipv6hdr); 1340 } 1341 dev->needed_headroom = encap_len + ETH_HLEN; 1342 1343 if (cfg->collect_md) { 1344 if (tun_on_same_port) { 1345 NL_SET_ERR_MSG(extack, 1346 "There can be only one externally controlled device on a destination port"); 1347 return -EPERM; 1348 } 1349 } else { 1350 if (tun_collect_md) { 1351 NL_SET_ERR_MSG(extack, 1352 "There already exists an externally controlled device on this destination port"); 1353 return -EPERM; 1354 } 1355 } 1356 1357 dst_cache_reset(&geneve->cfg.info.dst_cache); 1358 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1359 1360 err = register_netdevice(dev); 1361 if (err) 1362 return err; 1363 1364 list_add(&geneve->next, &gn->geneve_list); 1365 return 0; 1366 } 1367 1368 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1369 { 1370 memset(info, 0, sizeof(*info)); 1371 info->key.tp_dst = htons(dst_port); 1372 } 1373 1374 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1375 struct netlink_ext_ack *extack, 1376 struct geneve_config *cfg, bool changelink) 1377 { 1378 struct ip_tunnel_info *info = &cfg->info; 1379 int attrtype; 1380 1381 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1382 NL_SET_ERR_MSG(extack, 1383 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1384 return -EINVAL; 1385 } 1386 1387 if (data[IFLA_GENEVE_REMOTE]) { 1388 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1389 attrtype = IFLA_GENEVE_REMOTE; 1390 goto change_notsup; 1391 } 1392 1393 info->key.u.ipv4.dst = 1394 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1395 1396 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1397 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1398 "Remote IPv4 address cannot be Multicast"); 1399 return -EINVAL; 1400 } 1401 } 1402 1403 if (data[IFLA_GENEVE_REMOTE6]) { 1404 #if IS_ENABLED(CONFIG_IPV6) 1405 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1406 attrtype = IFLA_GENEVE_REMOTE6; 1407 goto change_notsup; 1408 } 1409 1410 info->mode = IP_TUNNEL_INFO_IPV6; 1411 info->key.u.ipv6.dst = 1412 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1413 1414 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1415 IPV6_ADDR_LINKLOCAL) { 1416 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1417 "Remote IPv6 address cannot be link-local"); 1418 return -EINVAL; 1419 } 1420 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1421 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1422 "Remote IPv6 address cannot be Multicast"); 1423 return -EINVAL; 1424 } 1425 info->key.tun_flags |= TUNNEL_CSUM; 1426 cfg->use_udp6_rx_checksums = true; 1427 #else 1428 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1429 "IPv6 support not enabled in the kernel"); 1430 return -EPFNOSUPPORT; 1431 #endif 1432 } 1433 1434 if (data[IFLA_GENEVE_ID]) { 1435 __u32 vni; 1436 __u8 tvni[3]; 1437 __be64 tunid; 1438 1439 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1440 tvni[0] = (vni & 0x00ff0000) >> 16; 1441 tvni[1] = (vni & 0x0000ff00) >> 8; 1442 tvni[2] = vni & 0x000000ff; 1443 1444 tunid = vni_to_tunnel_id(tvni); 1445 if (changelink && (tunid != info->key.tun_id)) { 1446 attrtype = IFLA_GENEVE_ID; 1447 goto change_notsup; 1448 } 1449 info->key.tun_id = tunid; 1450 } 1451 1452 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1453 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1454 cfg->ttl_inherit = true; 1455 else 1456 cfg->ttl_inherit = false; 1457 } else if (data[IFLA_GENEVE_TTL]) { 1458 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1459 cfg->ttl_inherit = false; 1460 } 1461 1462 if (data[IFLA_GENEVE_TOS]) 1463 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1464 1465 if (data[IFLA_GENEVE_DF]) 1466 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1467 1468 if (data[IFLA_GENEVE_LABEL]) { 1469 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1470 IPV6_FLOWLABEL_MASK; 1471 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1472 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1473 "Label attribute only applies for IPv6 Geneve devices"); 1474 return -EINVAL; 1475 } 1476 } 1477 1478 if (data[IFLA_GENEVE_PORT]) { 1479 if (changelink) { 1480 attrtype = IFLA_GENEVE_PORT; 1481 goto change_notsup; 1482 } 1483 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1484 } 1485 1486 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1487 if (changelink) { 1488 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1489 goto change_notsup; 1490 } 1491 cfg->collect_md = true; 1492 } 1493 1494 if (data[IFLA_GENEVE_UDP_CSUM]) { 1495 if (changelink) { 1496 attrtype = IFLA_GENEVE_UDP_CSUM; 1497 goto change_notsup; 1498 } 1499 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1500 info->key.tun_flags |= TUNNEL_CSUM; 1501 } 1502 1503 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1504 #if IS_ENABLED(CONFIG_IPV6) 1505 if (changelink) { 1506 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1507 goto change_notsup; 1508 } 1509 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1510 info->key.tun_flags &= ~TUNNEL_CSUM; 1511 #else 1512 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1513 "IPv6 support not enabled in the kernel"); 1514 return -EPFNOSUPPORT; 1515 #endif 1516 } 1517 1518 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1519 #if IS_ENABLED(CONFIG_IPV6) 1520 if (changelink) { 1521 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1522 goto change_notsup; 1523 } 1524 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1525 cfg->use_udp6_rx_checksums = false; 1526 #else 1527 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1528 "IPv6 support not enabled in the kernel"); 1529 return -EPFNOSUPPORT; 1530 #endif 1531 } 1532 1533 return 0; 1534 change_notsup: 1535 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1536 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported"); 1537 return -EOPNOTSUPP; 1538 } 1539 1540 static void geneve_link_config(struct net_device *dev, 1541 struct ip_tunnel_info *info, struct nlattr *tb[]) 1542 { 1543 struct geneve_dev *geneve = netdev_priv(dev); 1544 int ldev_mtu = 0; 1545 1546 if (tb[IFLA_MTU]) { 1547 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1548 return; 1549 } 1550 1551 switch (ip_tunnel_info_af(info)) { 1552 case AF_INET: { 1553 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1554 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1555 1556 if (!IS_ERR(rt) && rt->dst.dev) { 1557 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1558 ip_rt_put(rt); 1559 } 1560 break; 1561 } 1562 #if IS_ENABLED(CONFIG_IPV6) 1563 case AF_INET6: { 1564 struct rt6_info *rt; 1565 1566 if (!__in6_dev_get(dev)) 1567 break; 1568 1569 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1570 NULL, 0); 1571 1572 if (rt && rt->dst.dev) 1573 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1574 ip6_rt_put(rt); 1575 break; 1576 } 1577 #endif 1578 } 1579 1580 if (ldev_mtu <= 0) 1581 return; 1582 1583 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1584 } 1585 1586 static int geneve_newlink(struct net *net, struct net_device *dev, 1587 struct nlattr *tb[], struct nlattr *data[], 1588 struct netlink_ext_ack *extack) 1589 { 1590 struct geneve_config cfg = { 1591 .df = GENEVE_DF_UNSET, 1592 .use_udp6_rx_checksums = false, 1593 .ttl_inherit = false, 1594 .collect_md = false, 1595 }; 1596 int err; 1597 1598 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1599 err = geneve_nl2info(tb, data, extack, &cfg, false); 1600 if (err) 1601 return err; 1602 1603 err = geneve_configure(net, dev, extack, &cfg); 1604 if (err) 1605 return err; 1606 1607 geneve_link_config(dev, &cfg.info, tb); 1608 1609 return 0; 1610 } 1611 1612 /* Quiesces the geneve device data path for both TX and RX. 1613 * 1614 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1615 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1616 * to complete for the existing set of in-flight packets to be transmitted, 1617 * then we would have quiesced the transmit data path. All the future packets 1618 * will get dropped until we unquiesce the data path. 1619 * 1620 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1621 * if we set that to NULL under RCU and wait for synchronize_net() to 1622 * complete, then we would have quiesced the receive data path. 1623 */ 1624 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1625 struct geneve_sock **gs6) 1626 { 1627 *gs4 = rtnl_dereference(geneve->sock4); 1628 rcu_assign_pointer(geneve->sock4, NULL); 1629 if (*gs4) 1630 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1631 #if IS_ENABLED(CONFIG_IPV6) 1632 *gs6 = rtnl_dereference(geneve->sock6); 1633 rcu_assign_pointer(geneve->sock6, NULL); 1634 if (*gs6) 1635 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1636 #else 1637 *gs6 = NULL; 1638 #endif 1639 synchronize_net(); 1640 } 1641 1642 /* Resumes the geneve device data path for both TX and RX. */ 1643 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1644 struct geneve_sock __maybe_unused *gs6) 1645 { 1646 rcu_assign_pointer(geneve->sock4, gs4); 1647 if (gs4) 1648 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1649 #if IS_ENABLED(CONFIG_IPV6) 1650 rcu_assign_pointer(geneve->sock6, gs6); 1651 if (gs6) 1652 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1653 #endif 1654 synchronize_net(); 1655 } 1656 1657 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1658 struct nlattr *data[], 1659 struct netlink_ext_ack *extack) 1660 { 1661 struct geneve_dev *geneve = netdev_priv(dev); 1662 struct geneve_sock *gs4, *gs6; 1663 struct geneve_config cfg; 1664 int err; 1665 1666 /* If the geneve device is configured for metadata (or externally 1667 * controlled, for example, OVS), then nothing can be changed. 1668 */ 1669 if (geneve->cfg.collect_md) 1670 return -EOPNOTSUPP; 1671 1672 /* Start with the existing info. */ 1673 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1674 err = geneve_nl2info(tb, data, extack, &cfg, true); 1675 if (err) 1676 return err; 1677 1678 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1679 dst_cache_reset(&cfg.info.dst_cache); 1680 geneve_link_config(dev, &cfg.info, tb); 1681 } 1682 1683 geneve_quiesce(geneve, &gs4, &gs6); 1684 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1685 geneve_unquiesce(geneve, gs4, gs6); 1686 1687 return 0; 1688 } 1689 1690 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1691 { 1692 struct geneve_dev *geneve = netdev_priv(dev); 1693 1694 list_del(&geneve->next); 1695 unregister_netdevice_queue(dev, head); 1696 } 1697 1698 static size_t geneve_get_size(const struct net_device *dev) 1699 { 1700 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1701 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1702 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1703 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1704 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1705 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1706 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1707 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1708 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1709 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1710 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1711 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1712 0; 1713 } 1714 1715 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1716 { 1717 struct geneve_dev *geneve = netdev_priv(dev); 1718 struct ip_tunnel_info *info = &geneve->cfg.info; 1719 bool ttl_inherit = geneve->cfg.ttl_inherit; 1720 bool metadata = geneve->cfg.collect_md; 1721 __u8 tmp_vni[3]; 1722 __u32 vni; 1723 1724 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1725 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1726 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1727 goto nla_put_failure; 1728 1729 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1730 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1731 info->key.u.ipv4.dst)) 1732 goto nla_put_failure; 1733 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1734 !!(info->key.tun_flags & TUNNEL_CSUM))) 1735 goto nla_put_failure; 1736 1737 #if IS_ENABLED(CONFIG_IPV6) 1738 } else if (!metadata) { 1739 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1740 &info->key.u.ipv6.dst)) 1741 goto nla_put_failure; 1742 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1743 !(info->key.tun_flags & TUNNEL_CSUM))) 1744 goto nla_put_failure; 1745 #endif 1746 } 1747 1748 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1749 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1750 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1751 goto nla_put_failure; 1752 1753 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1754 goto nla_put_failure; 1755 1756 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1757 goto nla_put_failure; 1758 1759 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1760 goto nla_put_failure; 1761 1762 #if IS_ENABLED(CONFIG_IPV6) 1763 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1764 !geneve->cfg.use_udp6_rx_checksums)) 1765 goto nla_put_failure; 1766 #endif 1767 1768 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1769 goto nla_put_failure; 1770 1771 return 0; 1772 1773 nla_put_failure: 1774 return -EMSGSIZE; 1775 } 1776 1777 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1778 .kind = "geneve", 1779 .maxtype = IFLA_GENEVE_MAX, 1780 .policy = geneve_policy, 1781 .priv_size = sizeof(struct geneve_dev), 1782 .setup = geneve_setup, 1783 .validate = geneve_validate, 1784 .newlink = geneve_newlink, 1785 .changelink = geneve_changelink, 1786 .dellink = geneve_dellink, 1787 .get_size = geneve_get_size, 1788 .fill_info = geneve_fill_info, 1789 }; 1790 1791 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1792 u8 name_assign_type, u16 dst_port) 1793 { 1794 struct nlattr *tb[IFLA_MAX + 1]; 1795 struct net_device *dev; 1796 LIST_HEAD(list_kill); 1797 int err; 1798 struct geneve_config cfg = { 1799 .df = GENEVE_DF_UNSET, 1800 .use_udp6_rx_checksums = true, 1801 .ttl_inherit = false, 1802 .collect_md = true, 1803 }; 1804 1805 memset(tb, 0, sizeof(tb)); 1806 dev = rtnl_create_link(net, name, name_assign_type, 1807 &geneve_link_ops, tb, NULL); 1808 if (IS_ERR(dev)) 1809 return dev; 1810 1811 init_tnl_info(&cfg.info, dst_port); 1812 err = geneve_configure(net, dev, NULL, &cfg); 1813 if (err) { 1814 free_netdev(dev); 1815 return ERR_PTR(err); 1816 } 1817 1818 /* openvswitch users expect packet sizes to be unrestricted, 1819 * so set the largest MTU we can. 1820 */ 1821 err = geneve_change_mtu(dev, IP_MAX_MTU); 1822 if (err) 1823 goto err; 1824 1825 err = rtnl_configure_link(dev, NULL); 1826 if (err < 0) 1827 goto err; 1828 1829 return dev; 1830 err: 1831 geneve_dellink(dev, &list_kill); 1832 unregister_netdevice_many(&list_kill); 1833 return ERR_PTR(err); 1834 } 1835 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1836 1837 static int geneve_netdevice_event(struct notifier_block *unused, 1838 unsigned long event, void *ptr) 1839 { 1840 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1841 1842 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO || 1843 event == NETDEV_UDP_TUNNEL_DROP_INFO) { 1844 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO); 1845 } else if (event == NETDEV_UNREGISTER) { 1846 if (!dev->udp_tunnel_nic_info) 1847 geneve_offload_rx_ports(dev, false); 1848 } else if (event == NETDEV_REGISTER) { 1849 if (!dev->udp_tunnel_nic_info) 1850 geneve_offload_rx_ports(dev, true); 1851 } 1852 1853 return NOTIFY_DONE; 1854 } 1855 1856 static struct notifier_block geneve_notifier_block __read_mostly = { 1857 .notifier_call = geneve_netdevice_event, 1858 }; 1859 1860 static __net_init int geneve_init_net(struct net *net) 1861 { 1862 struct geneve_net *gn = net_generic(net, geneve_net_id); 1863 1864 INIT_LIST_HEAD(&gn->geneve_list); 1865 INIT_LIST_HEAD(&gn->sock_list); 1866 return 0; 1867 } 1868 1869 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1870 { 1871 struct geneve_net *gn = net_generic(net, geneve_net_id); 1872 struct geneve_dev *geneve, *next; 1873 struct net_device *dev, *aux; 1874 1875 /* gather any geneve devices that were moved into this ns */ 1876 for_each_netdev_safe(net, dev, aux) 1877 if (dev->rtnl_link_ops == &geneve_link_ops) 1878 unregister_netdevice_queue(dev, head); 1879 1880 /* now gather any other geneve devices that were created in this ns */ 1881 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1882 /* If geneve->dev is in the same netns, it was already added 1883 * to the list by the previous loop. 1884 */ 1885 if (!net_eq(dev_net(geneve->dev), net)) 1886 unregister_netdevice_queue(geneve->dev, head); 1887 } 1888 } 1889 1890 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1891 { 1892 struct net *net; 1893 LIST_HEAD(list); 1894 1895 rtnl_lock(); 1896 list_for_each_entry(net, net_list, exit_list) 1897 geneve_destroy_tunnels(net, &list); 1898 1899 /* unregister the devices gathered above */ 1900 unregister_netdevice_many(&list); 1901 rtnl_unlock(); 1902 1903 list_for_each_entry(net, net_list, exit_list) { 1904 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1905 1906 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1907 } 1908 } 1909 1910 static struct pernet_operations geneve_net_ops = { 1911 .init = geneve_init_net, 1912 .exit_batch = geneve_exit_batch_net, 1913 .id = &geneve_net_id, 1914 .size = sizeof(struct geneve_net), 1915 }; 1916 1917 static int __init geneve_init_module(void) 1918 { 1919 int rc; 1920 1921 rc = register_pernet_subsys(&geneve_net_ops); 1922 if (rc) 1923 goto out1; 1924 1925 rc = register_netdevice_notifier(&geneve_notifier_block); 1926 if (rc) 1927 goto out2; 1928 1929 rc = rtnl_link_register(&geneve_link_ops); 1930 if (rc) 1931 goto out3; 1932 1933 return 0; 1934 out3: 1935 unregister_netdevice_notifier(&geneve_notifier_block); 1936 out2: 1937 unregister_pernet_subsys(&geneve_net_ops); 1938 out1: 1939 return rc; 1940 } 1941 late_initcall(geneve_init_module); 1942 1943 static void __exit geneve_cleanup_module(void) 1944 { 1945 rtnl_link_unregister(&geneve_link_ops); 1946 unregister_netdevice_notifier(&geneve_notifier_block); 1947 unregister_pernet_subsys(&geneve_net_ops); 1948 } 1949 module_exit(geneve_cleanup_module); 1950 1951 MODULE_LICENSE("GPL"); 1952 MODULE_VERSION(GENEVE_NETDEV_VER); 1953 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1954 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1955 MODULE_ALIAS_RTNL_LINK("geneve"); 1956