1 /* 2 * GENEVE: Generic Network Virtualization Encapsulation 3 * 4 * Copyright (c) 2015 Red Hat, Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/etherdevice.h> 16 #include <linux/hash.h> 17 #include <net/dst_metadata.h> 18 #include <net/gro_cells.h> 19 #include <net/rtnetlink.h> 20 #include <net/geneve.h> 21 #include <net/protocol.h> 22 23 #define GENEVE_NETDEV_VER "0.6" 24 25 #define GENEVE_UDP_PORT 6081 26 27 #define GENEVE_N_VID (1u << 24) 28 #define GENEVE_VID_MASK (GENEVE_N_VID - 1) 29 30 #define VNI_HASH_BITS 10 31 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 32 33 static bool log_ecn_error = true; 34 module_param(log_ecn_error, bool, 0644); 35 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 36 37 #define GENEVE_VER 0 38 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) 39 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN) 40 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN) 41 42 /* per-network namespace private data for this module */ 43 struct geneve_net { 44 struct list_head geneve_list; 45 struct list_head sock_list; 46 }; 47 48 static unsigned int geneve_net_id; 49 50 struct geneve_dev_node { 51 struct hlist_node hlist; 52 struct geneve_dev *geneve; 53 }; 54 55 /* Pseudo network device */ 56 struct geneve_dev { 57 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ 58 #if IS_ENABLED(CONFIG_IPV6) 59 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ 60 #endif 61 struct net *net; /* netns for packet i/o */ 62 struct net_device *dev; /* netdev for geneve tunnel */ 63 struct ip_tunnel_info info; 64 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 65 #if IS_ENABLED(CONFIG_IPV6) 66 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ 67 #endif 68 struct list_head next; /* geneve's per namespace list */ 69 struct gro_cells gro_cells; 70 bool collect_md; 71 bool use_udp6_rx_checksums; 72 bool ttl_inherit; 73 enum ifla_geneve_df df; 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->info.key.tun_id, vni) && 140 addr == node->geneve->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->info.key.tun_id, vni) && 159 ipv6_addr_equal(&addr6, &node->geneve->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->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->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 (skb->len < 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->info.key.tp_dst); 662 if (gs) { 663 gs->refcnt++; 664 goto out; 665 } 666 667 gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6, 668 geneve->use_udp6_rx_checksums); 669 if (IS_ERR(gs)) 670 return PTR_ERR(gs); 671 672 out: 673 gs->collect_md = geneve->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->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 ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6); 696 bool metadata = geneve->collect_md; 697 int ret = 0; 698 699 #if IS_ENABLED(CONFIG_IPV6) 700 if (ipv6 || metadata) 701 ret = geneve_sock_add(geneve, true); 702 #endif 703 if (!ret && (!ipv6 || metadata)) 704 ret = geneve_sock_add(geneve, false); 705 if (ret < 0) 706 geneve_sock_release(geneve); 707 708 return ret; 709 } 710 711 static int geneve_stop(struct net_device *dev) 712 { 713 struct geneve_dev *geneve = netdev_priv(dev); 714 715 hlist_del_init_rcu(&geneve->hlist4.hlist); 716 #if IS_ENABLED(CONFIG_IPV6) 717 hlist_del_init_rcu(&geneve->hlist6.hlist); 718 #endif 719 geneve_sock_release(geneve); 720 return 0; 721 } 722 723 static void geneve_build_header(struct genevehdr *geneveh, 724 const struct ip_tunnel_info *info) 725 { 726 geneveh->ver = GENEVE_VER; 727 geneveh->opt_len = info->options_len / 4; 728 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 729 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 730 geneveh->rsvd1 = 0; 731 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 732 geneveh->proto_type = htons(ETH_P_TEB); 733 geneveh->rsvd2 = 0; 734 735 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 736 ip_tunnel_info_opts_get(geneveh->options, info); 737 } 738 739 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 740 const struct ip_tunnel_info *info, 741 bool xnet, int ip_hdr_len) 742 { 743 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 744 struct genevehdr *gnvh; 745 int min_headroom; 746 int err; 747 748 skb_reset_mac_header(skb); 749 skb_scrub_packet(skb, xnet); 750 751 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 752 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 753 err = skb_cow_head(skb, min_headroom); 754 if (unlikely(err)) 755 goto free_dst; 756 757 err = udp_tunnel_handle_offloads(skb, udp_sum); 758 if (err) 759 goto free_dst; 760 761 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 762 geneve_build_header(gnvh, info); 763 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 764 return 0; 765 766 free_dst: 767 dst_release(dst); 768 return err; 769 } 770 771 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 772 struct net_device *dev, 773 struct geneve_sock *gs4, 774 struct flowi4 *fl4, 775 const struct ip_tunnel_info *info) 776 { 777 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 778 struct geneve_dev *geneve = netdev_priv(dev); 779 struct dst_cache *dst_cache; 780 struct rtable *rt = NULL; 781 __u8 tos; 782 783 if (!gs4) 784 return ERR_PTR(-EIO); 785 786 memset(fl4, 0, sizeof(*fl4)); 787 fl4->flowi4_mark = skb->mark; 788 fl4->flowi4_proto = IPPROTO_UDP; 789 fl4->daddr = info->key.u.ipv4.dst; 790 fl4->saddr = info->key.u.ipv4.src; 791 792 tos = info->key.tos; 793 if ((tos == 1) && !geneve->collect_md) { 794 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 795 use_cache = false; 796 } 797 fl4->flowi4_tos = RT_TOS(tos); 798 799 dst_cache = (struct dst_cache *)&info->dst_cache; 800 if (use_cache) { 801 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 802 if (rt) 803 return rt; 804 } 805 rt = ip_route_output_key(geneve->net, fl4); 806 if (IS_ERR(rt)) { 807 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 808 return ERR_PTR(-ENETUNREACH); 809 } 810 if (rt->dst.dev == dev) { /* is this necessary? */ 811 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 812 ip_rt_put(rt); 813 return ERR_PTR(-ELOOP); 814 } 815 if (use_cache) 816 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 817 return rt; 818 } 819 820 #if IS_ENABLED(CONFIG_IPV6) 821 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 822 struct net_device *dev, 823 struct geneve_sock *gs6, 824 struct flowi6 *fl6, 825 const struct ip_tunnel_info *info) 826 { 827 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 828 struct geneve_dev *geneve = netdev_priv(dev); 829 struct dst_entry *dst = NULL; 830 struct dst_cache *dst_cache; 831 __u8 prio; 832 833 if (!gs6) 834 return ERR_PTR(-EIO); 835 836 memset(fl6, 0, sizeof(*fl6)); 837 fl6->flowi6_mark = skb->mark; 838 fl6->flowi6_proto = IPPROTO_UDP; 839 fl6->daddr = info->key.u.ipv6.dst; 840 fl6->saddr = info->key.u.ipv6.src; 841 prio = info->key.tos; 842 if ((prio == 1) && !geneve->collect_md) { 843 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 844 use_cache = false; 845 } 846 847 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 848 info->key.label); 849 dst_cache = (struct dst_cache *)&info->dst_cache; 850 if (use_cache) { 851 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 852 if (dst) 853 return dst; 854 } 855 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) { 856 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 857 return ERR_PTR(-ENETUNREACH); 858 } 859 if (dst->dev == dev) { /* is this necessary? */ 860 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 861 dst_release(dst); 862 return ERR_PTR(-ELOOP); 863 } 864 865 if (use_cache) 866 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 867 return dst; 868 } 869 #endif 870 871 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 872 struct geneve_dev *geneve, 873 const struct ip_tunnel_info *info) 874 { 875 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 876 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 877 const struct ip_tunnel_key *key = &info->key; 878 struct rtable *rt; 879 struct flowi4 fl4; 880 __u8 tos, ttl; 881 __be16 df = 0; 882 __be16 sport; 883 int err; 884 885 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info); 886 if (IS_ERR(rt)) 887 return PTR_ERR(rt); 888 889 skb_tunnel_check_pmtu(skb, &rt->dst, 890 GENEVE_IPV4_HLEN + info->options_len); 891 892 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 893 if (geneve->collect_md) { 894 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 895 ttl = key->ttl; 896 897 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 898 } else { 899 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); 900 if (geneve->ttl_inherit) 901 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 902 else 903 ttl = key->ttl; 904 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 905 906 if (geneve->df == GENEVE_DF_SET) { 907 df = htons(IP_DF); 908 } else if (geneve->df == GENEVE_DF_INHERIT) { 909 struct ethhdr *eth = eth_hdr(skb); 910 911 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 912 df = htons(IP_DF); 913 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 914 struct iphdr *iph = ip_hdr(skb); 915 916 if (iph->frag_off & htons(IP_DF)) 917 df = htons(IP_DF); 918 } 919 } 920 } 921 922 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr)); 923 if (unlikely(err)) 924 return err; 925 926 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 927 tos, ttl, df, sport, geneve->info.key.tp_dst, 928 !net_eq(geneve->net, dev_net(geneve->dev)), 929 !(info->key.tun_flags & TUNNEL_CSUM)); 930 return 0; 931 } 932 933 #if IS_ENABLED(CONFIG_IPV6) 934 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 935 struct geneve_dev *geneve, 936 const struct ip_tunnel_info *info) 937 { 938 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 939 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 940 const struct ip_tunnel_key *key = &info->key; 941 struct dst_entry *dst = NULL; 942 struct flowi6 fl6; 943 __u8 prio, ttl; 944 __be16 sport; 945 int err; 946 947 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info); 948 if (IS_ERR(dst)) 949 return PTR_ERR(dst); 950 951 skb_tunnel_check_pmtu(skb, dst, GENEVE_IPV6_HLEN + info->options_len); 952 953 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 954 if (geneve->collect_md) { 955 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 956 ttl = key->ttl; 957 } else { 958 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 959 ip_hdr(skb), skb); 960 if (geneve->ttl_inherit) 961 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 962 else 963 ttl = key->ttl; 964 ttl = ttl ? : ip6_dst_hoplimit(dst); 965 } 966 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr)); 967 if (unlikely(err)) 968 return err; 969 970 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 971 &fl6.saddr, &fl6.daddr, prio, ttl, 972 info->key.label, sport, geneve->info.key.tp_dst, 973 !(info->key.tun_flags & TUNNEL_CSUM)); 974 return 0; 975 } 976 #endif 977 978 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 979 { 980 struct geneve_dev *geneve = netdev_priv(dev); 981 struct ip_tunnel_info *info = NULL; 982 int err; 983 984 if (geneve->collect_md) { 985 info = skb_tunnel_info(skb); 986 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 987 err = -EINVAL; 988 netdev_dbg(dev, "no tunnel metadata\n"); 989 goto tx_error; 990 } 991 } else { 992 info = &geneve->info; 993 } 994 995 rcu_read_lock(); 996 #if IS_ENABLED(CONFIG_IPV6) 997 if (info->mode & IP_TUNNEL_INFO_IPV6) 998 err = geneve6_xmit_skb(skb, dev, geneve, info); 999 else 1000 #endif 1001 err = geneve_xmit_skb(skb, dev, geneve, info); 1002 rcu_read_unlock(); 1003 1004 if (likely(!err)) 1005 return NETDEV_TX_OK; 1006 tx_error: 1007 dev_kfree_skb(skb); 1008 1009 if (err == -ELOOP) 1010 dev->stats.collisions++; 1011 else if (err == -ENETUNREACH) 1012 dev->stats.tx_carrier_errors++; 1013 1014 dev->stats.tx_errors++; 1015 return NETDEV_TX_OK; 1016 } 1017 1018 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1019 { 1020 if (new_mtu > dev->max_mtu) 1021 new_mtu = dev->max_mtu; 1022 else if (new_mtu < dev->min_mtu) 1023 new_mtu = dev->min_mtu; 1024 1025 dev->mtu = new_mtu; 1026 return 0; 1027 } 1028 1029 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1030 { 1031 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1032 struct geneve_dev *geneve = netdev_priv(dev); 1033 1034 if (ip_tunnel_info_af(info) == AF_INET) { 1035 struct rtable *rt; 1036 struct flowi4 fl4; 1037 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1038 1039 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info); 1040 if (IS_ERR(rt)) 1041 return PTR_ERR(rt); 1042 1043 ip_rt_put(rt); 1044 info->key.u.ipv4.src = fl4.saddr; 1045 #if IS_ENABLED(CONFIG_IPV6) 1046 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1047 struct dst_entry *dst; 1048 struct flowi6 fl6; 1049 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1050 1051 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info); 1052 if (IS_ERR(dst)) 1053 return PTR_ERR(dst); 1054 1055 dst_release(dst); 1056 info->key.u.ipv6.src = fl6.saddr; 1057 #endif 1058 } else { 1059 return -EINVAL; 1060 } 1061 1062 info->key.tp_src = udp_flow_src_port(geneve->net, skb, 1063 1, USHRT_MAX, true); 1064 info->key.tp_dst = geneve->info.key.tp_dst; 1065 return 0; 1066 } 1067 1068 static const struct net_device_ops geneve_netdev_ops = { 1069 .ndo_init = geneve_init, 1070 .ndo_uninit = geneve_uninit, 1071 .ndo_open = geneve_open, 1072 .ndo_stop = geneve_stop, 1073 .ndo_start_xmit = geneve_xmit, 1074 .ndo_get_stats64 = ip_tunnel_get_stats64, 1075 .ndo_change_mtu = geneve_change_mtu, 1076 .ndo_validate_addr = eth_validate_addr, 1077 .ndo_set_mac_address = eth_mac_addr, 1078 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1079 }; 1080 1081 static void geneve_get_drvinfo(struct net_device *dev, 1082 struct ethtool_drvinfo *drvinfo) 1083 { 1084 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1085 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1086 } 1087 1088 static const struct ethtool_ops geneve_ethtool_ops = { 1089 .get_drvinfo = geneve_get_drvinfo, 1090 .get_link = ethtool_op_get_link, 1091 }; 1092 1093 /* Info for udev, that this is a virtual tunnel endpoint */ 1094 static struct device_type geneve_type = { 1095 .name = "geneve", 1096 }; 1097 1098 /* Calls the ndo_udp_tunnel_add of the caller in order to 1099 * supply the listening GENEVE udp ports. Callers are expected 1100 * to implement the ndo_udp_tunnel_add. 1101 */ 1102 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1103 { 1104 struct net *net = dev_net(dev); 1105 struct geneve_net *gn = net_generic(net, geneve_net_id); 1106 struct geneve_sock *gs; 1107 1108 rcu_read_lock(); 1109 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1110 if (push) { 1111 udp_tunnel_push_rx_port(dev, gs->sock, 1112 UDP_TUNNEL_TYPE_GENEVE); 1113 } else { 1114 udp_tunnel_drop_rx_port(dev, gs->sock, 1115 UDP_TUNNEL_TYPE_GENEVE); 1116 } 1117 } 1118 rcu_read_unlock(); 1119 } 1120 1121 /* Initialize the device structure. */ 1122 static void geneve_setup(struct net_device *dev) 1123 { 1124 ether_setup(dev); 1125 1126 dev->netdev_ops = &geneve_netdev_ops; 1127 dev->ethtool_ops = &geneve_ethtool_ops; 1128 dev->needs_free_netdev = true; 1129 1130 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1131 1132 dev->features |= NETIF_F_LLTX; 1133 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1134 dev->features |= NETIF_F_RXCSUM; 1135 dev->features |= NETIF_F_GSO_SOFTWARE; 1136 1137 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 1138 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1139 1140 /* MTU range: 68 - (something less than 65535) */ 1141 dev->min_mtu = ETH_MIN_MTU; 1142 /* The max_mtu calculation does not take account of GENEVE 1143 * options, to avoid excluding potentially valid 1144 * configurations. This will be further reduced by IPvX hdr size. 1145 */ 1146 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1147 1148 netif_keep_dst(dev); 1149 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1150 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1151 eth_hw_addr_random(dev); 1152 } 1153 1154 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1155 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1156 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, 1157 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1158 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1159 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1160 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1161 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1162 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1163 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1164 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1165 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1166 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1167 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1168 }; 1169 1170 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1171 struct netlink_ext_ack *extack) 1172 { 1173 if (tb[IFLA_ADDRESS]) { 1174 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1175 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1176 "Provided link layer address is not Ethernet"); 1177 return -EINVAL; 1178 } 1179 1180 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1181 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1182 "Provided Ethernet address is not unicast"); 1183 return -EADDRNOTAVAIL; 1184 } 1185 } 1186 1187 if (!data) { 1188 NL_SET_ERR_MSG(extack, 1189 "Not enough attributes provided to perform the operation"); 1190 return -EINVAL; 1191 } 1192 1193 if (data[IFLA_GENEVE_ID]) { 1194 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1195 1196 if (vni >= GENEVE_N_VID) { 1197 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1198 "Geneve ID must be lower than 16777216"); 1199 return -ERANGE; 1200 } 1201 } 1202 1203 if (data[IFLA_GENEVE_DF]) { 1204 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1205 1206 if (df < 0 || df > GENEVE_DF_MAX) { 1207 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_GENEVE_DF], 1208 "Invalid DF attribute"); 1209 return -EINVAL; 1210 } 1211 } 1212 1213 return 0; 1214 } 1215 1216 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1217 const struct ip_tunnel_info *info, 1218 bool *tun_on_same_port, 1219 bool *tun_collect_md) 1220 { 1221 struct geneve_dev *geneve, *t = NULL; 1222 1223 *tun_on_same_port = false; 1224 *tun_collect_md = false; 1225 list_for_each_entry(geneve, &gn->geneve_list, next) { 1226 if (info->key.tp_dst == geneve->info.key.tp_dst) { 1227 *tun_collect_md = geneve->collect_md; 1228 *tun_on_same_port = true; 1229 } 1230 if (info->key.tun_id == geneve->info.key.tun_id && 1231 info->key.tp_dst == geneve->info.key.tp_dst && 1232 !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u))) 1233 t = geneve; 1234 } 1235 return t; 1236 } 1237 1238 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1239 { 1240 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1241 info->key.ttl || info->key.label || info->key.tp_src || 1242 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1243 } 1244 1245 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1246 struct ip_tunnel_info *b) 1247 { 1248 if (ip_tunnel_info_af(a) == AF_INET) 1249 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1250 else 1251 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1252 } 1253 1254 static int geneve_configure(struct net *net, struct net_device *dev, 1255 struct netlink_ext_ack *extack, 1256 const struct ip_tunnel_info *info, 1257 bool metadata, bool ipv6_rx_csum, 1258 bool ttl_inherit, enum ifla_geneve_df df) 1259 { 1260 struct geneve_net *gn = net_generic(net, geneve_net_id); 1261 struct geneve_dev *t, *geneve = netdev_priv(dev); 1262 bool tun_collect_md, tun_on_same_port; 1263 int err, encap_len; 1264 1265 if (metadata && !is_tnl_info_zero(info)) { 1266 NL_SET_ERR_MSG(extack, 1267 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1268 return -EINVAL; 1269 } 1270 1271 geneve->net = net; 1272 geneve->dev = dev; 1273 1274 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1275 if (t) 1276 return -EBUSY; 1277 1278 /* make enough headroom for basic scenario */ 1279 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1280 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1281 encap_len += sizeof(struct iphdr); 1282 dev->max_mtu -= sizeof(struct iphdr); 1283 } else { 1284 encap_len += sizeof(struct ipv6hdr); 1285 dev->max_mtu -= sizeof(struct ipv6hdr); 1286 } 1287 dev->needed_headroom = encap_len + ETH_HLEN; 1288 1289 if (metadata) { 1290 if (tun_on_same_port) { 1291 NL_SET_ERR_MSG(extack, 1292 "There can be only one externally controlled device on a destination port"); 1293 return -EPERM; 1294 } 1295 } else { 1296 if (tun_collect_md) { 1297 NL_SET_ERR_MSG(extack, 1298 "There already exists an externally controlled device on this destination port"); 1299 return -EPERM; 1300 } 1301 } 1302 1303 dst_cache_reset(&geneve->info.dst_cache); 1304 geneve->info = *info; 1305 geneve->collect_md = metadata; 1306 geneve->use_udp6_rx_checksums = ipv6_rx_csum; 1307 geneve->ttl_inherit = ttl_inherit; 1308 geneve->df = df; 1309 1310 err = register_netdevice(dev); 1311 if (err) 1312 return err; 1313 1314 list_add(&geneve->next, &gn->geneve_list); 1315 return 0; 1316 } 1317 1318 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1319 { 1320 memset(info, 0, sizeof(*info)); 1321 info->key.tp_dst = htons(dst_port); 1322 } 1323 1324 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1325 struct netlink_ext_ack *extack, 1326 struct ip_tunnel_info *info, bool *metadata, 1327 bool *use_udp6_rx_checksums, bool *ttl_inherit, 1328 enum ifla_geneve_df *df, bool changelink) 1329 { 1330 int attrtype; 1331 1332 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1333 NL_SET_ERR_MSG(extack, 1334 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1335 return -EINVAL; 1336 } 1337 1338 if (data[IFLA_GENEVE_REMOTE]) { 1339 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1340 attrtype = IFLA_GENEVE_REMOTE; 1341 goto change_notsup; 1342 } 1343 1344 info->key.u.ipv4.dst = 1345 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1346 1347 if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) { 1348 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1349 "Remote IPv4 address cannot be Multicast"); 1350 return -EINVAL; 1351 } 1352 } 1353 1354 if (data[IFLA_GENEVE_REMOTE6]) { 1355 #if IS_ENABLED(CONFIG_IPV6) 1356 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1357 attrtype = IFLA_GENEVE_REMOTE6; 1358 goto change_notsup; 1359 } 1360 1361 info->mode = IP_TUNNEL_INFO_IPV6; 1362 info->key.u.ipv6.dst = 1363 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1364 1365 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1366 IPV6_ADDR_LINKLOCAL) { 1367 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1368 "Remote IPv6 address cannot be link-local"); 1369 return -EINVAL; 1370 } 1371 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1372 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1373 "Remote IPv6 address cannot be Multicast"); 1374 return -EINVAL; 1375 } 1376 info->key.tun_flags |= TUNNEL_CSUM; 1377 *use_udp6_rx_checksums = true; 1378 #else 1379 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1380 "IPv6 support not enabled in the kernel"); 1381 return -EPFNOSUPPORT; 1382 #endif 1383 } 1384 1385 if (data[IFLA_GENEVE_ID]) { 1386 __u32 vni; 1387 __u8 tvni[3]; 1388 __be64 tunid; 1389 1390 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1391 tvni[0] = (vni & 0x00ff0000) >> 16; 1392 tvni[1] = (vni & 0x0000ff00) >> 8; 1393 tvni[2] = vni & 0x000000ff; 1394 1395 tunid = vni_to_tunnel_id(tvni); 1396 if (changelink && (tunid != info->key.tun_id)) { 1397 attrtype = IFLA_GENEVE_ID; 1398 goto change_notsup; 1399 } 1400 info->key.tun_id = tunid; 1401 } 1402 1403 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1404 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1405 *ttl_inherit = true; 1406 else 1407 *ttl_inherit = false; 1408 } else if (data[IFLA_GENEVE_TTL]) { 1409 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1410 *ttl_inherit = false; 1411 } 1412 1413 if (data[IFLA_GENEVE_TOS]) 1414 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1415 1416 if (data[IFLA_GENEVE_DF]) 1417 *df = nla_get_u8(data[IFLA_GENEVE_DF]); 1418 1419 if (data[IFLA_GENEVE_LABEL]) { 1420 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1421 IPV6_FLOWLABEL_MASK; 1422 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1423 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1424 "Label attribute only applies for IPv6 Geneve devices"); 1425 return -EINVAL; 1426 } 1427 } 1428 1429 if (data[IFLA_GENEVE_PORT]) { 1430 if (changelink) { 1431 attrtype = IFLA_GENEVE_PORT; 1432 goto change_notsup; 1433 } 1434 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1435 } 1436 1437 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1438 if (changelink) { 1439 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1440 goto change_notsup; 1441 } 1442 *metadata = true; 1443 } 1444 1445 if (data[IFLA_GENEVE_UDP_CSUM]) { 1446 if (changelink) { 1447 attrtype = IFLA_GENEVE_UDP_CSUM; 1448 goto change_notsup; 1449 } 1450 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1451 info->key.tun_flags |= TUNNEL_CSUM; 1452 } 1453 1454 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1455 #if IS_ENABLED(CONFIG_IPV6) 1456 if (changelink) { 1457 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1458 goto change_notsup; 1459 } 1460 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1461 info->key.tun_flags &= ~TUNNEL_CSUM; 1462 #else 1463 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1464 "IPv6 support not enabled in the kernel"); 1465 return -EPFNOSUPPORT; 1466 #endif 1467 } 1468 1469 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1470 #if IS_ENABLED(CONFIG_IPV6) 1471 if (changelink) { 1472 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1473 goto change_notsup; 1474 } 1475 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1476 *use_udp6_rx_checksums = false; 1477 #else 1478 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1479 "IPv6 support not enabled in the kernel"); 1480 return -EPFNOSUPPORT; 1481 #endif 1482 } 1483 1484 return 0; 1485 change_notsup: 1486 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1487 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported"); 1488 return -EOPNOTSUPP; 1489 } 1490 1491 static void geneve_link_config(struct net_device *dev, 1492 struct ip_tunnel_info *info, struct nlattr *tb[]) 1493 { 1494 struct geneve_dev *geneve = netdev_priv(dev); 1495 int ldev_mtu = 0; 1496 1497 if (tb[IFLA_MTU]) { 1498 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1499 return; 1500 } 1501 1502 switch (ip_tunnel_info_af(info)) { 1503 case AF_INET: { 1504 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1505 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1506 1507 if (!IS_ERR(rt) && rt->dst.dev) { 1508 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1509 ip_rt_put(rt); 1510 } 1511 break; 1512 } 1513 #if IS_ENABLED(CONFIG_IPV6) 1514 case AF_INET6: { 1515 struct rt6_info *rt = rt6_lookup(geneve->net, 1516 &info->key.u.ipv6.dst, NULL, 0, 1517 NULL, 0); 1518 1519 if (rt && rt->dst.dev) 1520 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1521 ip6_rt_put(rt); 1522 break; 1523 } 1524 #endif 1525 } 1526 1527 if (ldev_mtu <= 0) 1528 return; 1529 1530 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1531 } 1532 1533 static int geneve_newlink(struct net *net, struct net_device *dev, 1534 struct nlattr *tb[], struct nlattr *data[], 1535 struct netlink_ext_ack *extack) 1536 { 1537 enum ifla_geneve_df df = GENEVE_DF_UNSET; 1538 bool use_udp6_rx_checksums = false; 1539 struct ip_tunnel_info info; 1540 bool ttl_inherit = false; 1541 bool metadata = false; 1542 int err; 1543 1544 init_tnl_info(&info, GENEVE_UDP_PORT); 1545 err = geneve_nl2info(tb, data, extack, &info, &metadata, 1546 &use_udp6_rx_checksums, &ttl_inherit, &df, false); 1547 if (err) 1548 return err; 1549 1550 err = geneve_configure(net, dev, extack, &info, metadata, 1551 use_udp6_rx_checksums, ttl_inherit, df); 1552 if (err) 1553 return err; 1554 1555 geneve_link_config(dev, &info, tb); 1556 1557 return 0; 1558 } 1559 1560 /* Quiesces the geneve device data path for both TX and RX. 1561 * 1562 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1563 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1564 * to complete for the existing set of in-flight packets to be transmitted, 1565 * then we would have quiesced the transmit data path. All the future packets 1566 * will get dropped until we unquiesce the data path. 1567 * 1568 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1569 * if we set that to NULL under RCU and wait for synchronize_net() to 1570 * complete, then we would have quiesced the receive data path. 1571 */ 1572 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1573 struct geneve_sock **gs6) 1574 { 1575 *gs4 = rtnl_dereference(geneve->sock4); 1576 rcu_assign_pointer(geneve->sock4, NULL); 1577 if (*gs4) 1578 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1579 #if IS_ENABLED(CONFIG_IPV6) 1580 *gs6 = rtnl_dereference(geneve->sock6); 1581 rcu_assign_pointer(geneve->sock6, NULL); 1582 if (*gs6) 1583 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1584 #else 1585 *gs6 = NULL; 1586 #endif 1587 synchronize_net(); 1588 } 1589 1590 /* Resumes the geneve device data path for both TX and RX. */ 1591 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1592 struct geneve_sock __maybe_unused *gs6) 1593 { 1594 rcu_assign_pointer(geneve->sock4, gs4); 1595 if (gs4) 1596 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1597 #if IS_ENABLED(CONFIG_IPV6) 1598 rcu_assign_pointer(geneve->sock6, gs6); 1599 if (gs6) 1600 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1601 #endif 1602 synchronize_net(); 1603 } 1604 1605 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1606 struct nlattr *data[], 1607 struct netlink_ext_ack *extack) 1608 { 1609 struct geneve_dev *geneve = netdev_priv(dev); 1610 struct geneve_sock *gs4, *gs6; 1611 struct ip_tunnel_info info; 1612 bool metadata; 1613 bool use_udp6_rx_checksums; 1614 enum ifla_geneve_df df; 1615 bool ttl_inherit; 1616 int err; 1617 1618 /* If the geneve device is configured for metadata (or externally 1619 * controlled, for example, OVS), then nothing can be changed. 1620 */ 1621 if (geneve->collect_md) 1622 return -EOPNOTSUPP; 1623 1624 /* Start with the existing info. */ 1625 memcpy(&info, &geneve->info, sizeof(info)); 1626 metadata = geneve->collect_md; 1627 use_udp6_rx_checksums = geneve->use_udp6_rx_checksums; 1628 ttl_inherit = geneve->ttl_inherit; 1629 err = geneve_nl2info(tb, data, extack, &info, &metadata, 1630 &use_udp6_rx_checksums, &ttl_inherit, &df, true); 1631 if (err) 1632 return err; 1633 1634 if (!geneve_dst_addr_equal(&geneve->info, &info)) { 1635 dst_cache_reset(&info.dst_cache); 1636 geneve_link_config(dev, &info, tb); 1637 } 1638 1639 geneve_quiesce(geneve, &gs4, &gs6); 1640 geneve->info = info; 1641 geneve->collect_md = metadata; 1642 geneve->use_udp6_rx_checksums = use_udp6_rx_checksums; 1643 geneve->ttl_inherit = ttl_inherit; 1644 geneve_unquiesce(geneve, gs4, gs6); 1645 1646 return 0; 1647 } 1648 1649 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1650 { 1651 struct geneve_dev *geneve = netdev_priv(dev); 1652 1653 list_del(&geneve->next); 1654 unregister_netdevice_queue(dev, head); 1655 } 1656 1657 static size_t geneve_get_size(const struct net_device *dev) 1658 { 1659 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1660 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1661 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1662 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1663 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1664 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1665 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1666 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1667 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1668 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1669 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1670 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1671 0; 1672 } 1673 1674 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1675 { 1676 struct geneve_dev *geneve = netdev_priv(dev); 1677 struct ip_tunnel_info *info = &geneve->info; 1678 bool ttl_inherit = geneve->ttl_inherit; 1679 bool metadata = geneve->collect_md; 1680 __u8 tmp_vni[3]; 1681 __u32 vni; 1682 1683 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1684 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1685 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1686 goto nla_put_failure; 1687 1688 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1689 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1690 info->key.u.ipv4.dst)) 1691 goto nla_put_failure; 1692 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1693 !!(info->key.tun_flags & TUNNEL_CSUM))) 1694 goto nla_put_failure; 1695 1696 #if IS_ENABLED(CONFIG_IPV6) 1697 } else if (!metadata) { 1698 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1699 &info->key.u.ipv6.dst)) 1700 goto nla_put_failure; 1701 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1702 !(info->key.tun_flags & TUNNEL_CSUM))) 1703 goto nla_put_failure; 1704 #endif 1705 } 1706 1707 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1708 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1709 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1710 goto nla_put_failure; 1711 1712 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->df)) 1713 goto nla_put_failure; 1714 1715 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1716 goto nla_put_failure; 1717 1718 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1719 goto nla_put_failure; 1720 1721 #if IS_ENABLED(CONFIG_IPV6) 1722 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1723 !geneve->use_udp6_rx_checksums)) 1724 goto nla_put_failure; 1725 #endif 1726 1727 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1728 goto nla_put_failure; 1729 1730 return 0; 1731 1732 nla_put_failure: 1733 return -EMSGSIZE; 1734 } 1735 1736 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1737 .kind = "geneve", 1738 .maxtype = IFLA_GENEVE_MAX, 1739 .policy = geneve_policy, 1740 .priv_size = sizeof(struct geneve_dev), 1741 .setup = geneve_setup, 1742 .validate = geneve_validate, 1743 .newlink = geneve_newlink, 1744 .changelink = geneve_changelink, 1745 .dellink = geneve_dellink, 1746 .get_size = geneve_get_size, 1747 .fill_info = geneve_fill_info, 1748 }; 1749 1750 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1751 u8 name_assign_type, u16 dst_port) 1752 { 1753 struct nlattr *tb[IFLA_MAX + 1]; 1754 struct ip_tunnel_info info; 1755 struct net_device *dev; 1756 LIST_HEAD(list_kill); 1757 int err; 1758 1759 memset(tb, 0, sizeof(tb)); 1760 dev = rtnl_create_link(net, name, name_assign_type, 1761 &geneve_link_ops, tb, NULL); 1762 if (IS_ERR(dev)) 1763 return dev; 1764 1765 init_tnl_info(&info, dst_port); 1766 err = geneve_configure(net, dev, NULL, &info, 1767 true, true, false, GENEVE_DF_UNSET); 1768 if (err) { 1769 free_netdev(dev); 1770 return ERR_PTR(err); 1771 } 1772 1773 /* openvswitch users expect packet sizes to be unrestricted, 1774 * so set the largest MTU we can. 1775 */ 1776 err = geneve_change_mtu(dev, IP_MAX_MTU); 1777 if (err) 1778 goto err; 1779 1780 err = rtnl_configure_link(dev, NULL); 1781 if (err < 0) 1782 goto err; 1783 1784 return dev; 1785 err: 1786 geneve_dellink(dev, &list_kill); 1787 unregister_netdevice_many(&list_kill); 1788 return ERR_PTR(err); 1789 } 1790 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1791 1792 static int geneve_netdevice_event(struct notifier_block *unused, 1793 unsigned long event, void *ptr) 1794 { 1795 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1796 1797 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO || 1798 event == NETDEV_UDP_TUNNEL_DROP_INFO) { 1799 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO); 1800 } else if (event == NETDEV_UNREGISTER) { 1801 geneve_offload_rx_ports(dev, false); 1802 } else if (event == NETDEV_REGISTER) { 1803 geneve_offload_rx_ports(dev, true); 1804 } 1805 1806 return NOTIFY_DONE; 1807 } 1808 1809 static struct notifier_block geneve_notifier_block __read_mostly = { 1810 .notifier_call = geneve_netdevice_event, 1811 }; 1812 1813 static __net_init int geneve_init_net(struct net *net) 1814 { 1815 struct geneve_net *gn = net_generic(net, geneve_net_id); 1816 1817 INIT_LIST_HEAD(&gn->geneve_list); 1818 INIT_LIST_HEAD(&gn->sock_list); 1819 return 0; 1820 } 1821 1822 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1823 { 1824 struct geneve_net *gn = net_generic(net, geneve_net_id); 1825 struct geneve_dev *geneve, *next; 1826 struct net_device *dev, *aux; 1827 1828 /* gather any geneve devices that were moved into this ns */ 1829 for_each_netdev_safe(net, dev, aux) 1830 if (dev->rtnl_link_ops == &geneve_link_ops) 1831 unregister_netdevice_queue(dev, head); 1832 1833 /* now gather any other geneve devices that were created in this ns */ 1834 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1835 /* If geneve->dev is in the same netns, it was already added 1836 * to the list by the previous loop. 1837 */ 1838 if (!net_eq(dev_net(geneve->dev), net)) 1839 unregister_netdevice_queue(geneve->dev, head); 1840 } 1841 1842 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1843 } 1844 1845 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1846 { 1847 struct net *net; 1848 LIST_HEAD(list); 1849 1850 rtnl_lock(); 1851 list_for_each_entry(net, net_list, exit_list) 1852 geneve_destroy_tunnels(net, &list); 1853 1854 /* unregister the devices gathered above */ 1855 unregister_netdevice_many(&list); 1856 rtnl_unlock(); 1857 } 1858 1859 static struct pernet_operations geneve_net_ops = { 1860 .init = geneve_init_net, 1861 .exit_batch = geneve_exit_batch_net, 1862 .id = &geneve_net_id, 1863 .size = sizeof(struct geneve_net), 1864 }; 1865 1866 static int __init geneve_init_module(void) 1867 { 1868 int rc; 1869 1870 rc = register_pernet_subsys(&geneve_net_ops); 1871 if (rc) 1872 goto out1; 1873 1874 rc = register_netdevice_notifier(&geneve_notifier_block); 1875 if (rc) 1876 goto out2; 1877 1878 rc = rtnl_link_register(&geneve_link_ops); 1879 if (rc) 1880 goto out3; 1881 1882 return 0; 1883 out3: 1884 unregister_netdevice_notifier(&geneve_notifier_block); 1885 out2: 1886 unregister_pernet_subsys(&geneve_net_ops); 1887 out1: 1888 return rc; 1889 } 1890 late_initcall(geneve_init_module); 1891 1892 static void __exit geneve_cleanup_module(void) 1893 { 1894 rtnl_link_unregister(&geneve_link_ops); 1895 unregister_netdevice_notifier(&geneve_notifier_block); 1896 unregister_pernet_subsys(&geneve_net_ops); 1897 } 1898 module_exit(geneve_cleanup_module); 1899 1900 MODULE_LICENSE("GPL"); 1901 MODULE_VERSION(GENEVE_NETDEV_VER); 1902 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1903 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1904 MODULE_ALIAS_RTNL_LINK("geneve"); 1905