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 __be16 dport, __be16 sport) 782 { 783 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 784 struct geneve_dev *geneve = netdev_priv(dev); 785 struct dst_cache *dst_cache; 786 struct rtable *rt = NULL; 787 __u8 tos; 788 789 if (!gs4) 790 return ERR_PTR(-EIO); 791 792 memset(fl4, 0, sizeof(*fl4)); 793 fl4->flowi4_mark = skb->mark; 794 fl4->flowi4_proto = IPPROTO_UDP; 795 fl4->daddr = info->key.u.ipv4.dst; 796 fl4->saddr = info->key.u.ipv4.src; 797 fl4->fl4_dport = dport; 798 fl4->fl4_sport = sport; 799 800 tos = info->key.tos; 801 if ((tos == 1) && !geneve->cfg.collect_md) { 802 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 803 use_cache = false; 804 } 805 fl4->flowi4_tos = RT_TOS(tos); 806 807 dst_cache = (struct dst_cache *)&info->dst_cache; 808 if (use_cache) { 809 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 810 if (rt) 811 return rt; 812 } 813 rt = ip_route_output_key(geneve->net, fl4); 814 if (IS_ERR(rt)) { 815 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 816 return ERR_PTR(-ENETUNREACH); 817 } 818 if (rt->dst.dev == dev) { /* is this necessary? */ 819 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 820 ip_rt_put(rt); 821 return ERR_PTR(-ELOOP); 822 } 823 if (use_cache) 824 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 825 return rt; 826 } 827 828 #if IS_ENABLED(CONFIG_IPV6) 829 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 830 struct net_device *dev, 831 struct geneve_sock *gs6, 832 struct flowi6 *fl6, 833 const struct ip_tunnel_info *info, 834 __be16 dport, __be16 sport) 835 { 836 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 837 struct geneve_dev *geneve = netdev_priv(dev); 838 struct dst_entry *dst = NULL; 839 struct dst_cache *dst_cache; 840 __u8 prio; 841 842 if (!gs6) 843 return ERR_PTR(-EIO); 844 845 memset(fl6, 0, sizeof(*fl6)); 846 fl6->flowi6_mark = skb->mark; 847 fl6->flowi6_proto = IPPROTO_UDP; 848 fl6->daddr = info->key.u.ipv6.dst; 849 fl6->saddr = info->key.u.ipv6.src; 850 fl6->fl6_dport = dport; 851 fl6->fl6_sport = sport; 852 853 prio = info->key.tos; 854 if ((prio == 1) && !geneve->cfg.collect_md) { 855 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 856 use_cache = false; 857 } 858 859 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 860 info->key.label); 861 dst_cache = (struct dst_cache *)&info->dst_cache; 862 if (use_cache) { 863 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 864 if (dst) 865 return dst; 866 } 867 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, 868 NULL); 869 if (IS_ERR(dst)) { 870 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 871 return ERR_PTR(-ENETUNREACH); 872 } 873 if (dst->dev == dev) { /* is this necessary? */ 874 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 875 dst_release(dst); 876 return ERR_PTR(-ELOOP); 877 } 878 879 if (use_cache) 880 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 881 return dst; 882 } 883 #endif 884 885 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 886 struct geneve_dev *geneve, 887 const struct ip_tunnel_info *info) 888 { 889 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 890 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 891 const struct ip_tunnel_key *key = &info->key; 892 struct rtable *rt; 893 struct flowi4 fl4; 894 __u8 tos, ttl; 895 __be16 df = 0; 896 __be16 sport; 897 int err; 898 899 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 900 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 901 geneve->cfg.info.key.tp_dst, sport); 902 if (IS_ERR(rt)) 903 return PTR_ERR(rt); 904 905 err = skb_tunnel_check_pmtu(skb, &rt->dst, 906 GENEVE_IPV4_HLEN + info->options_len, 907 netif_is_any_bridge_port(dev)); 908 if (err < 0) { 909 dst_release(&rt->dst); 910 return err; 911 } else if (err) { 912 struct ip_tunnel_info *info; 913 914 info = skb_tunnel_info(skb); 915 if (info) { 916 info->key.u.ipv4.dst = fl4.saddr; 917 info->key.u.ipv4.src = fl4.daddr; 918 } 919 920 if (!pskb_may_pull(skb, ETH_HLEN)) { 921 dst_release(&rt->dst); 922 return -EINVAL; 923 } 924 925 skb->protocol = eth_type_trans(skb, geneve->dev); 926 netif_rx(skb); 927 dst_release(&rt->dst); 928 return -EMSGSIZE; 929 } 930 931 if (geneve->cfg.collect_md) { 932 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 933 ttl = key->ttl; 934 935 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 936 } else { 937 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); 938 if (geneve->cfg.ttl_inherit) 939 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 940 else 941 ttl = key->ttl; 942 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 943 944 if (geneve->cfg.df == GENEVE_DF_SET) { 945 df = htons(IP_DF); 946 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 947 struct ethhdr *eth = eth_hdr(skb); 948 949 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 950 df = htons(IP_DF); 951 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 952 struct iphdr *iph = ip_hdr(skb); 953 954 if (iph->frag_off & htons(IP_DF)) 955 df = htons(IP_DF); 956 } 957 } 958 } 959 960 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr)); 961 if (unlikely(err)) 962 return err; 963 964 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 965 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 966 !net_eq(geneve->net, dev_net(geneve->dev)), 967 !(info->key.tun_flags & TUNNEL_CSUM)); 968 return 0; 969 } 970 971 #if IS_ENABLED(CONFIG_IPV6) 972 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 973 struct geneve_dev *geneve, 974 const struct ip_tunnel_info *info) 975 { 976 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 977 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 978 const struct ip_tunnel_key *key = &info->key; 979 struct dst_entry *dst = NULL; 980 struct flowi6 fl6; 981 __u8 prio, ttl; 982 __be16 sport; 983 int err; 984 985 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 986 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 987 geneve->cfg.info.key.tp_dst, sport); 988 if (IS_ERR(dst)) 989 return PTR_ERR(dst); 990 991 err = skb_tunnel_check_pmtu(skb, dst, 992 GENEVE_IPV6_HLEN + info->options_len, 993 netif_is_any_bridge_port(dev)); 994 if (err < 0) { 995 dst_release(dst); 996 return err; 997 } else if (err) { 998 struct ip_tunnel_info *info = skb_tunnel_info(skb); 999 1000 if (info) { 1001 info->key.u.ipv6.dst = fl6.saddr; 1002 info->key.u.ipv6.src = fl6.daddr; 1003 } 1004 1005 if (!pskb_may_pull(skb, ETH_HLEN)) { 1006 dst_release(dst); 1007 return -EINVAL; 1008 } 1009 1010 skb->protocol = eth_type_trans(skb, geneve->dev); 1011 netif_rx(skb); 1012 dst_release(dst); 1013 return -EMSGSIZE; 1014 } 1015 1016 if (geneve->cfg.collect_md) { 1017 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 1018 ttl = key->ttl; 1019 } else { 1020 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1021 ip_hdr(skb), skb); 1022 if (geneve->cfg.ttl_inherit) 1023 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1024 else 1025 ttl = key->ttl; 1026 ttl = ttl ? : ip6_dst_hoplimit(dst); 1027 } 1028 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr)); 1029 if (unlikely(err)) 1030 return err; 1031 1032 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1033 &fl6.saddr, &fl6.daddr, prio, ttl, 1034 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1035 !(info->key.tun_flags & TUNNEL_CSUM)); 1036 return 0; 1037 } 1038 #endif 1039 1040 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1041 { 1042 struct geneve_dev *geneve = netdev_priv(dev); 1043 struct ip_tunnel_info *info = NULL; 1044 int err; 1045 1046 if (geneve->cfg.collect_md) { 1047 info = skb_tunnel_info(skb); 1048 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1049 netdev_dbg(dev, "no tunnel metadata\n"); 1050 dev_kfree_skb(skb); 1051 dev->stats.tx_dropped++; 1052 return NETDEV_TX_OK; 1053 } 1054 } else { 1055 info = &geneve->cfg.info; 1056 } 1057 1058 rcu_read_lock(); 1059 #if IS_ENABLED(CONFIG_IPV6) 1060 if (info->mode & IP_TUNNEL_INFO_IPV6) 1061 err = geneve6_xmit_skb(skb, dev, geneve, info); 1062 else 1063 #endif 1064 err = geneve_xmit_skb(skb, dev, geneve, info); 1065 rcu_read_unlock(); 1066 1067 if (likely(!err)) 1068 return NETDEV_TX_OK; 1069 1070 if (err != -EMSGSIZE) 1071 dev_kfree_skb(skb); 1072 1073 if (err == -ELOOP) 1074 dev->stats.collisions++; 1075 else if (err == -ENETUNREACH) 1076 dev->stats.tx_carrier_errors++; 1077 1078 dev->stats.tx_errors++; 1079 return NETDEV_TX_OK; 1080 } 1081 1082 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1083 { 1084 if (new_mtu > dev->max_mtu) 1085 new_mtu = dev->max_mtu; 1086 else if (new_mtu < dev->min_mtu) 1087 new_mtu = dev->min_mtu; 1088 1089 dev->mtu = new_mtu; 1090 return 0; 1091 } 1092 1093 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1094 { 1095 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1096 struct geneve_dev *geneve = netdev_priv(dev); 1097 __be16 sport; 1098 1099 if (ip_tunnel_info_af(info) == AF_INET) { 1100 struct rtable *rt; 1101 struct flowi4 fl4; 1102 1103 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1104 sport = udp_flow_src_port(geneve->net, skb, 1105 1, USHRT_MAX, true); 1106 1107 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 1108 geneve->cfg.info.key.tp_dst, sport); 1109 if (IS_ERR(rt)) 1110 return PTR_ERR(rt); 1111 1112 ip_rt_put(rt); 1113 info->key.u.ipv4.src = fl4.saddr; 1114 #if IS_ENABLED(CONFIG_IPV6) 1115 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1116 struct dst_entry *dst; 1117 struct flowi6 fl6; 1118 1119 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1120 sport = udp_flow_src_port(geneve->net, skb, 1121 1, USHRT_MAX, true); 1122 1123 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1124 geneve->cfg.info.key.tp_dst, sport); 1125 if (IS_ERR(dst)) 1126 return PTR_ERR(dst); 1127 1128 dst_release(dst); 1129 info->key.u.ipv6.src = fl6.saddr; 1130 #endif 1131 } else { 1132 return -EINVAL; 1133 } 1134 1135 info->key.tp_src = sport; 1136 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1137 return 0; 1138 } 1139 1140 static const struct net_device_ops geneve_netdev_ops = { 1141 .ndo_init = geneve_init, 1142 .ndo_uninit = geneve_uninit, 1143 .ndo_open = geneve_open, 1144 .ndo_stop = geneve_stop, 1145 .ndo_start_xmit = geneve_xmit, 1146 .ndo_get_stats64 = ip_tunnel_get_stats64, 1147 .ndo_change_mtu = geneve_change_mtu, 1148 .ndo_validate_addr = eth_validate_addr, 1149 .ndo_set_mac_address = eth_mac_addr, 1150 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1151 }; 1152 1153 static void geneve_get_drvinfo(struct net_device *dev, 1154 struct ethtool_drvinfo *drvinfo) 1155 { 1156 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1157 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1158 } 1159 1160 static const struct ethtool_ops geneve_ethtool_ops = { 1161 .get_drvinfo = geneve_get_drvinfo, 1162 .get_link = ethtool_op_get_link, 1163 }; 1164 1165 /* Info for udev, that this is a virtual tunnel endpoint */ 1166 static struct device_type geneve_type = { 1167 .name = "geneve", 1168 }; 1169 1170 /* Calls the ndo_udp_tunnel_add of the caller in order to 1171 * supply the listening GENEVE udp ports. Callers are expected 1172 * to implement the ndo_udp_tunnel_add. 1173 */ 1174 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1175 { 1176 struct net *net = dev_net(dev); 1177 struct geneve_net *gn = net_generic(net, geneve_net_id); 1178 struct geneve_sock *gs; 1179 1180 rcu_read_lock(); 1181 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1182 if (push) { 1183 udp_tunnel_push_rx_port(dev, gs->sock, 1184 UDP_TUNNEL_TYPE_GENEVE); 1185 } else { 1186 udp_tunnel_drop_rx_port(dev, gs->sock, 1187 UDP_TUNNEL_TYPE_GENEVE); 1188 } 1189 } 1190 rcu_read_unlock(); 1191 } 1192 1193 /* Initialize the device structure. */ 1194 static void geneve_setup(struct net_device *dev) 1195 { 1196 ether_setup(dev); 1197 1198 dev->netdev_ops = &geneve_netdev_ops; 1199 dev->ethtool_ops = &geneve_ethtool_ops; 1200 dev->needs_free_netdev = true; 1201 1202 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1203 1204 dev->features |= NETIF_F_LLTX; 1205 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1206 dev->features |= NETIF_F_RXCSUM; 1207 dev->features |= NETIF_F_GSO_SOFTWARE; 1208 1209 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 1210 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1211 1212 /* MTU range: 68 - (something less than 65535) */ 1213 dev->min_mtu = ETH_MIN_MTU; 1214 /* The max_mtu calculation does not take account of GENEVE 1215 * options, to avoid excluding potentially valid 1216 * configurations. This will be further reduced by IPvX hdr size. 1217 */ 1218 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1219 1220 netif_keep_dst(dev); 1221 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1222 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1223 eth_hw_addr_random(dev); 1224 } 1225 1226 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1227 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1228 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1229 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1230 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1231 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1232 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1233 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1234 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1235 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1236 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1237 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1238 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1239 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1240 }; 1241 1242 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1243 struct netlink_ext_ack *extack) 1244 { 1245 if (tb[IFLA_ADDRESS]) { 1246 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1247 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1248 "Provided link layer address is not Ethernet"); 1249 return -EINVAL; 1250 } 1251 1252 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1253 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1254 "Provided Ethernet address is not unicast"); 1255 return -EADDRNOTAVAIL; 1256 } 1257 } 1258 1259 if (!data) { 1260 NL_SET_ERR_MSG(extack, 1261 "Not enough attributes provided to perform the operation"); 1262 return -EINVAL; 1263 } 1264 1265 if (data[IFLA_GENEVE_ID]) { 1266 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1267 1268 if (vni >= GENEVE_N_VID) { 1269 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1270 "Geneve ID must be lower than 16777216"); 1271 return -ERANGE; 1272 } 1273 } 1274 1275 if (data[IFLA_GENEVE_DF]) { 1276 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1277 1278 if (df < 0 || df > GENEVE_DF_MAX) { 1279 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1280 "Invalid DF attribute"); 1281 return -EINVAL; 1282 } 1283 } 1284 1285 return 0; 1286 } 1287 1288 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1289 const struct ip_tunnel_info *info, 1290 bool *tun_on_same_port, 1291 bool *tun_collect_md) 1292 { 1293 struct geneve_dev *geneve, *t = NULL; 1294 1295 *tun_on_same_port = false; 1296 *tun_collect_md = false; 1297 list_for_each_entry(geneve, &gn->geneve_list, next) { 1298 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1299 *tun_collect_md = geneve->cfg.collect_md; 1300 *tun_on_same_port = true; 1301 } 1302 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1303 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1304 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1305 t = geneve; 1306 } 1307 return t; 1308 } 1309 1310 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1311 { 1312 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1313 info->key.ttl || info->key.label || info->key.tp_src || 1314 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1315 } 1316 1317 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1318 struct ip_tunnel_info *b) 1319 { 1320 if (ip_tunnel_info_af(a) == AF_INET) 1321 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1322 else 1323 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1324 } 1325 1326 static int geneve_configure(struct net *net, struct net_device *dev, 1327 struct netlink_ext_ack *extack, 1328 const struct geneve_config *cfg) 1329 { 1330 struct geneve_net *gn = net_generic(net, geneve_net_id); 1331 struct geneve_dev *t, *geneve = netdev_priv(dev); 1332 const struct ip_tunnel_info *info = &cfg->info; 1333 bool tun_collect_md, tun_on_same_port; 1334 int err, encap_len; 1335 1336 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1337 NL_SET_ERR_MSG(extack, 1338 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1339 return -EINVAL; 1340 } 1341 1342 geneve->net = net; 1343 geneve->dev = dev; 1344 1345 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1346 if (t) 1347 return -EBUSY; 1348 1349 /* make enough headroom for basic scenario */ 1350 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1351 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1352 encap_len += sizeof(struct iphdr); 1353 dev->max_mtu -= sizeof(struct iphdr); 1354 } else { 1355 encap_len += sizeof(struct ipv6hdr); 1356 dev->max_mtu -= sizeof(struct ipv6hdr); 1357 } 1358 dev->needed_headroom = encap_len + ETH_HLEN; 1359 1360 if (cfg->collect_md) { 1361 if (tun_on_same_port) { 1362 NL_SET_ERR_MSG(extack, 1363 "There can be only one externally controlled device on a destination port"); 1364 return -EPERM; 1365 } 1366 } else { 1367 if (tun_collect_md) { 1368 NL_SET_ERR_MSG(extack, 1369 "There already exists an externally controlled device on this destination port"); 1370 return -EPERM; 1371 } 1372 } 1373 1374 dst_cache_reset(&geneve->cfg.info.dst_cache); 1375 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1376 1377 err = register_netdevice(dev); 1378 if (err) 1379 return err; 1380 1381 list_add(&geneve->next, &gn->geneve_list); 1382 return 0; 1383 } 1384 1385 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1386 { 1387 memset(info, 0, sizeof(*info)); 1388 info->key.tp_dst = htons(dst_port); 1389 } 1390 1391 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1392 struct netlink_ext_ack *extack, 1393 struct geneve_config *cfg, bool changelink) 1394 { 1395 struct ip_tunnel_info *info = &cfg->info; 1396 int attrtype; 1397 1398 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1399 NL_SET_ERR_MSG(extack, 1400 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1401 return -EINVAL; 1402 } 1403 1404 if (data[IFLA_GENEVE_REMOTE]) { 1405 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1406 attrtype = IFLA_GENEVE_REMOTE; 1407 goto change_notsup; 1408 } 1409 1410 info->key.u.ipv4.dst = 1411 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1412 1413 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1414 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1415 "Remote IPv4 address cannot be Multicast"); 1416 return -EINVAL; 1417 } 1418 } 1419 1420 if (data[IFLA_GENEVE_REMOTE6]) { 1421 #if IS_ENABLED(CONFIG_IPV6) 1422 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1423 attrtype = IFLA_GENEVE_REMOTE6; 1424 goto change_notsup; 1425 } 1426 1427 info->mode = IP_TUNNEL_INFO_IPV6; 1428 info->key.u.ipv6.dst = 1429 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1430 1431 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1432 IPV6_ADDR_LINKLOCAL) { 1433 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1434 "Remote IPv6 address cannot be link-local"); 1435 return -EINVAL; 1436 } 1437 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1438 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1439 "Remote IPv6 address cannot be Multicast"); 1440 return -EINVAL; 1441 } 1442 info->key.tun_flags |= TUNNEL_CSUM; 1443 cfg->use_udp6_rx_checksums = true; 1444 #else 1445 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1446 "IPv6 support not enabled in the kernel"); 1447 return -EPFNOSUPPORT; 1448 #endif 1449 } 1450 1451 if (data[IFLA_GENEVE_ID]) { 1452 __u32 vni; 1453 __u8 tvni[3]; 1454 __be64 tunid; 1455 1456 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1457 tvni[0] = (vni & 0x00ff0000) >> 16; 1458 tvni[1] = (vni & 0x0000ff00) >> 8; 1459 tvni[2] = vni & 0x000000ff; 1460 1461 tunid = vni_to_tunnel_id(tvni); 1462 if (changelink && (tunid != info->key.tun_id)) { 1463 attrtype = IFLA_GENEVE_ID; 1464 goto change_notsup; 1465 } 1466 info->key.tun_id = tunid; 1467 } 1468 1469 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1470 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1471 cfg->ttl_inherit = true; 1472 else 1473 cfg->ttl_inherit = false; 1474 } else if (data[IFLA_GENEVE_TTL]) { 1475 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1476 cfg->ttl_inherit = false; 1477 } 1478 1479 if (data[IFLA_GENEVE_TOS]) 1480 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1481 1482 if (data[IFLA_GENEVE_DF]) 1483 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1484 1485 if (data[IFLA_GENEVE_LABEL]) { 1486 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1487 IPV6_FLOWLABEL_MASK; 1488 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1489 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1490 "Label attribute only applies for IPv6 Geneve devices"); 1491 return -EINVAL; 1492 } 1493 } 1494 1495 if (data[IFLA_GENEVE_PORT]) { 1496 if (changelink) { 1497 attrtype = IFLA_GENEVE_PORT; 1498 goto change_notsup; 1499 } 1500 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1501 } 1502 1503 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1504 if (changelink) { 1505 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1506 goto change_notsup; 1507 } 1508 cfg->collect_md = true; 1509 } 1510 1511 if (data[IFLA_GENEVE_UDP_CSUM]) { 1512 if (changelink) { 1513 attrtype = IFLA_GENEVE_UDP_CSUM; 1514 goto change_notsup; 1515 } 1516 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1517 info->key.tun_flags |= TUNNEL_CSUM; 1518 } 1519 1520 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1521 #if IS_ENABLED(CONFIG_IPV6) 1522 if (changelink) { 1523 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1524 goto change_notsup; 1525 } 1526 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1527 info->key.tun_flags &= ~TUNNEL_CSUM; 1528 #else 1529 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1530 "IPv6 support not enabled in the kernel"); 1531 return -EPFNOSUPPORT; 1532 #endif 1533 } 1534 1535 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1536 #if IS_ENABLED(CONFIG_IPV6) 1537 if (changelink) { 1538 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1539 goto change_notsup; 1540 } 1541 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1542 cfg->use_udp6_rx_checksums = false; 1543 #else 1544 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1545 "IPv6 support not enabled in the kernel"); 1546 return -EPFNOSUPPORT; 1547 #endif 1548 } 1549 1550 return 0; 1551 change_notsup: 1552 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1553 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported"); 1554 return -EOPNOTSUPP; 1555 } 1556 1557 static void geneve_link_config(struct net_device *dev, 1558 struct ip_tunnel_info *info, struct nlattr *tb[]) 1559 { 1560 struct geneve_dev *geneve = netdev_priv(dev); 1561 int ldev_mtu = 0; 1562 1563 if (tb[IFLA_MTU]) { 1564 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1565 return; 1566 } 1567 1568 switch (ip_tunnel_info_af(info)) { 1569 case AF_INET: { 1570 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1571 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1572 1573 if (!IS_ERR(rt) && rt->dst.dev) { 1574 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1575 ip_rt_put(rt); 1576 } 1577 break; 1578 } 1579 #if IS_ENABLED(CONFIG_IPV6) 1580 case AF_INET6: { 1581 struct rt6_info *rt; 1582 1583 if (!__in6_dev_get(dev)) 1584 break; 1585 1586 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1587 NULL, 0); 1588 1589 if (rt && rt->dst.dev) 1590 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1591 ip6_rt_put(rt); 1592 break; 1593 } 1594 #endif 1595 } 1596 1597 if (ldev_mtu <= 0) 1598 return; 1599 1600 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1601 } 1602 1603 static int geneve_newlink(struct net *net, struct net_device *dev, 1604 struct nlattr *tb[], struct nlattr *data[], 1605 struct netlink_ext_ack *extack) 1606 { 1607 struct geneve_config cfg = { 1608 .df = GENEVE_DF_UNSET, 1609 .use_udp6_rx_checksums = false, 1610 .ttl_inherit = false, 1611 .collect_md = false, 1612 }; 1613 int err; 1614 1615 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1616 err = geneve_nl2info(tb, data, extack, &cfg, false); 1617 if (err) 1618 return err; 1619 1620 err = geneve_configure(net, dev, extack, &cfg); 1621 if (err) 1622 return err; 1623 1624 geneve_link_config(dev, &cfg.info, tb); 1625 1626 return 0; 1627 } 1628 1629 /* Quiesces the geneve device data path for both TX and RX. 1630 * 1631 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1632 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1633 * to complete for the existing set of in-flight packets to be transmitted, 1634 * then we would have quiesced the transmit data path. All the future packets 1635 * will get dropped until we unquiesce the data path. 1636 * 1637 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1638 * if we set that to NULL under RCU and wait for synchronize_net() to 1639 * complete, then we would have quiesced the receive data path. 1640 */ 1641 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1642 struct geneve_sock **gs6) 1643 { 1644 *gs4 = rtnl_dereference(geneve->sock4); 1645 rcu_assign_pointer(geneve->sock4, NULL); 1646 if (*gs4) 1647 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1648 #if IS_ENABLED(CONFIG_IPV6) 1649 *gs6 = rtnl_dereference(geneve->sock6); 1650 rcu_assign_pointer(geneve->sock6, NULL); 1651 if (*gs6) 1652 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1653 #else 1654 *gs6 = NULL; 1655 #endif 1656 synchronize_net(); 1657 } 1658 1659 /* Resumes the geneve device data path for both TX and RX. */ 1660 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1661 struct geneve_sock __maybe_unused *gs6) 1662 { 1663 rcu_assign_pointer(geneve->sock4, gs4); 1664 if (gs4) 1665 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1666 #if IS_ENABLED(CONFIG_IPV6) 1667 rcu_assign_pointer(geneve->sock6, gs6); 1668 if (gs6) 1669 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1670 #endif 1671 synchronize_net(); 1672 } 1673 1674 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1675 struct nlattr *data[], 1676 struct netlink_ext_ack *extack) 1677 { 1678 struct geneve_dev *geneve = netdev_priv(dev); 1679 struct geneve_sock *gs4, *gs6; 1680 struct geneve_config cfg; 1681 int err; 1682 1683 /* If the geneve device is configured for metadata (or externally 1684 * controlled, for example, OVS), then nothing can be changed. 1685 */ 1686 if (geneve->cfg.collect_md) 1687 return -EOPNOTSUPP; 1688 1689 /* Start with the existing info. */ 1690 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1691 err = geneve_nl2info(tb, data, extack, &cfg, true); 1692 if (err) 1693 return err; 1694 1695 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1696 dst_cache_reset(&cfg.info.dst_cache); 1697 geneve_link_config(dev, &cfg.info, tb); 1698 } 1699 1700 geneve_quiesce(geneve, &gs4, &gs6); 1701 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1702 geneve_unquiesce(geneve, gs4, gs6); 1703 1704 return 0; 1705 } 1706 1707 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1708 { 1709 struct geneve_dev *geneve = netdev_priv(dev); 1710 1711 list_del(&geneve->next); 1712 unregister_netdevice_queue(dev, head); 1713 } 1714 1715 static size_t geneve_get_size(const struct net_device *dev) 1716 { 1717 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1718 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1719 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1720 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1721 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1722 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1723 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1724 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1725 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1726 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1727 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1728 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1729 0; 1730 } 1731 1732 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1733 { 1734 struct geneve_dev *geneve = netdev_priv(dev); 1735 struct ip_tunnel_info *info = &geneve->cfg.info; 1736 bool ttl_inherit = geneve->cfg.ttl_inherit; 1737 bool metadata = geneve->cfg.collect_md; 1738 __u8 tmp_vni[3]; 1739 __u32 vni; 1740 1741 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1742 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1743 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1744 goto nla_put_failure; 1745 1746 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1747 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1748 info->key.u.ipv4.dst)) 1749 goto nla_put_failure; 1750 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1751 !!(info->key.tun_flags & TUNNEL_CSUM))) 1752 goto nla_put_failure; 1753 1754 #if IS_ENABLED(CONFIG_IPV6) 1755 } else if (!metadata) { 1756 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1757 &info->key.u.ipv6.dst)) 1758 goto nla_put_failure; 1759 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1760 !(info->key.tun_flags & TUNNEL_CSUM))) 1761 goto nla_put_failure; 1762 #endif 1763 } 1764 1765 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1766 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1767 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1768 goto nla_put_failure; 1769 1770 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1771 goto nla_put_failure; 1772 1773 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1774 goto nla_put_failure; 1775 1776 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1777 goto nla_put_failure; 1778 1779 #if IS_ENABLED(CONFIG_IPV6) 1780 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1781 !geneve->cfg.use_udp6_rx_checksums)) 1782 goto nla_put_failure; 1783 #endif 1784 1785 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1786 goto nla_put_failure; 1787 1788 return 0; 1789 1790 nla_put_failure: 1791 return -EMSGSIZE; 1792 } 1793 1794 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1795 .kind = "geneve", 1796 .maxtype = IFLA_GENEVE_MAX, 1797 .policy = geneve_policy, 1798 .priv_size = sizeof(struct geneve_dev), 1799 .setup = geneve_setup, 1800 .validate = geneve_validate, 1801 .newlink = geneve_newlink, 1802 .changelink = geneve_changelink, 1803 .dellink = geneve_dellink, 1804 .get_size = geneve_get_size, 1805 .fill_info = geneve_fill_info, 1806 }; 1807 1808 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1809 u8 name_assign_type, u16 dst_port) 1810 { 1811 struct nlattr *tb[IFLA_MAX + 1]; 1812 struct net_device *dev; 1813 LIST_HEAD(list_kill); 1814 int err; 1815 struct geneve_config cfg = { 1816 .df = GENEVE_DF_UNSET, 1817 .use_udp6_rx_checksums = true, 1818 .ttl_inherit = false, 1819 .collect_md = true, 1820 }; 1821 1822 memset(tb, 0, sizeof(tb)); 1823 dev = rtnl_create_link(net, name, name_assign_type, 1824 &geneve_link_ops, tb, NULL); 1825 if (IS_ERR(dev)) 1826 return dev; 1827 1828 init_tnl_info(&cfg.info, dst_port); 1829 err = geneve_configure(net, dev, NULL, &cfg); 1830 if (err) { 1831 free_netdev(dev); 1832 return ERR_PTR(err); 1833 } 1834 1835 /* openvswitch users expect packet sizes to be unrestricted, 1836 * so set the largest MTU we can. 1837 */ 1838 err = geneve_change_mtu(dev, IP_MAX_MTU); 1839 if (err) 1840 goto err; 1841 1842 err = rtnl_configure_link(dev, NULL); 1843 if (err < 0) 1844 goto err; 1845 1846 return dev; 1847 err: 1848 geneve_dellink(dev, &list_kill); 1849 unregister_netdevice_many(&list_kill); 1850 return ERR_PTR(err); 1851 } 1852 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1853 1854 static int geneve_netdevice_event(struct notifier_block *unused, 1855 unsigned long event, void *ptr) 1856 { 1857 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1858 1859 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO || 1860 event == NETDEV_UDP_TUNNEL_DROP_INFO) { 1861 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO); 1862 } else if (event == NETDEV_UNREGISTER) { 1863 if (!dev->udp_tunnel_nic_info) 1864 geneve_offload_rx_ports(dev, false); 1865 } else if (event == NETDEV_REGISTER) { 1866 if (!dev->udp_tunnel_nic_info) 1867 geneve_offload_rx_ports(dev, true); 1868 } 1869 1870 return NOTIFY_DONE; 1871 } 1872 1873 static struct notifier_block geneve_notifier_block __read_mostly = { 1874 .notifier_call = geneve_netdevice_event, 1875 }; 1876 1877 static __net_init int geneve_init_net(struct net *net) 1878 { 1879 struct geneve_net *gn = net_generic(net, geneve_net_id); 1880 1881 INIT_LIST_HEAD(&gn->geneve_list); 1882 INIT_LIST_HEAD(&gn->sock_list); 1883 return 0; 1884 } 1885 1886 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1887 { 1888 struct geneve_net *gn = net_generic(net, geneve_net_id); 1889 struct geneve_dev *geneve, *next; 1890 struct net_device *dev, *aux; 1891 1892 /* gather any geneve devices that were moved into this ns */ 1893 for_each_netdev_safe(net, dev, aux) 1894 if (dev->rtnl_link_ops == &geneve_link_ops) 1895 unregister_netdevice_queue(dev, head); 1896 1897 /* now gather any other geneve devices that were created in this ns */ 1898 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1899 /* If geneve->dev is in the same netns, it was already added 1900 * to the list by the previous loop. 1901 */ 1902 if (!net_eq(dev_net(geneve->dev), net)) 1903 unregister_netdevice_queue(geneve->dev, head); 1904 } 1905 } 1906 1907 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1908 { 1909 struct net *net; 1910 LIST_HEAD(list); 1911 1912 rtnl_lock(); 1913 list_for_each_entry(net, net_list, exit_list) 1914 geneve_destroy_tunnels(net, &list); 1915 1916 /* unregister the devices gathered above */ 1917 unregister_netdevice_many(&list); 1918 rtnl_unlock(); 1919 1920 list_for_each_entry(net, net_list, exit_list) { 1921 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1922 1923 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1924 } 1925 } 1926 1927 static struct pernet_operations geneve_net_ops = { 1928 .init = geneve_init_net, 1929 .exit_batch = geneve_exit_batch_net, 1930 .id = &geneve_net_id, 1931 .size = sizeof(struct geneve_net), 1932 }; 1933 1934 static int __init geneve_init_module(void) 1935 { 1936 int rc; 1937 1938 rc = register_pernet_subsys(&geneve_net_ops); 1939 if (rc) 1940 goto out1; 1941 1942 rc = register_netdevice_notifier(&geneve_notifier_block); 1943 if (rc) 1944 goto out2; 1945 1946 rc = rtnl_link_register(&geneve_link_ops); 1947 if (rc) 1948 goto out3; 1949 1950 return 0; 1951 out3: 1952 unregister_netdevice_notifier(&geneve_notifier_block); 1953 out2: 1954 unregister_pernet_subsys(&geneve_net_ops); 1955 out1: 1956 return rc; 1957 } 1958 late_initcall(geneve_init_module); 1959 1960 static void __exit geneve_cleanup_module(void) 1961 { 1962 rtnl_link_unregister(&geneve_link_ops); 1963 unregister_netdevice_notifier(&geneve_notifier_block); 1964 unregister_pernet_subsys(&geneve_net_ops); 1965 } 1966 module_exit(geneve_cleanup_module); 1967 1968 MODULE_LICENSE("GPL"); 1969 MODULE_VERSION(GENEVE_NETDEV_VER); 1970 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1971 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1972 MODULE_ALIAS_RTNL_LINK("geneve"); 1973