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/ethtool.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/etherdevice.h> 14 #include <linux/hash.h> 15 #include <net/ipv6_stubs.h> 16 #include <net/dst_metadata.h> 17 #include <net/gro_cells.h> 18 #include <net/rtnetlink.h> 19 #include <net/geneve.h> 20 #include <net/gro.h> 21 #include <net/protocol.h> 22 23 #define GENEVE_NETDEV_VER "0.6" 24 25 #define GENEVE_N_VID (1u << 24) 26 #define GENEVE_VID_MASK (GENEVE_N_VID - 1) 27 28 #define VNI_HASH_BITS 10 29 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 30 31 static bool log_ecn_error = true; 32 module_param(log_ecn_error, bool, 0644); 33 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 34 35 #define GENEVE_VER 0 36 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) 37 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN) 38 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN) 39 40 /* per-network namespace private data for this module */ 41 struct geneve_net { 42 struct list_head geneve_list; 43 struct list_head sock_list; 44 }; 45 46 static unsigned int geneve_net_id; 47 48 struct geneve_dev_node { 49 struct hlist_node hlist; 50 struct geneve_dev *geneve; 51 }; 52 53 struct geneve_config { 54 struct ip_tunnel_info info; 55 bool collect_md; 56 bool use_udp6_rx_checksums; 57 bool ttl_inherit; 58 enum ifla_geneve_df df; 59 bool inner_proto_inherit; 60 }; 61 62 /* Pseudo network device */ 63 struct geneve_dev { 64 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ 65 #if IS_ENABLED(CONFIG_IPV6) 66 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ 67 #endif 68 struct net *net; /* netns for packet i/o */ 69 struct net_device *dev; /* netdev for geneve tunnel */ 70 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 71 #if IS_ENABLED(CONFIG_IPV6) 72 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ 73 #endif 74 struct list_head next; /* geneve's per namespace list */ 75 struct gro_cells gro_cells; 76 struct geneve_config cfg; 77 }; 78 79 struct geneve_sock { 80 bool collect_md; 81 struct list_head list; 82 struct socket *sock; 83 struct rcu_head rcu; 84 int refcnt; 85 struct hlist_head vni_list[VNI_HASH_SIZE]; 86 }; 87 88 static inline __u32 geneve_net_vni_hash(u8 vni[3]) 89 { 90 __u32 vnid; 91 92 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 93 return hash_32(vnid, VNI_HASH_BITS); 94 } 95 96 static __be64 vni_to_tunnel_id(const __u8 *vni) 97 { 98 #ifdef __BIG_ENDIAN 99 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 100 #else 101 return (__force __be64)(((__force u64)vni[0] << 40) | 102 ((__force u64)vni[1] << 48) | 103 ((__force u64)vni[2] << 56)); 104 #endif 105 } 106 107 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 108 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 109 { 110 #ifdef __BIG_ENDIAN 111 vni[0] = (__force __u8)(tun_id >> 16); 112 vni[1] = (__force __u8)(tun_id >> 8); 113 vni[2] = (__force __u8)tun_id; 114 #else 115 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 116 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 117 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 118 #endif 119 } 120 121 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) 122 { 123 return !memcmp(vni, &tun_id[5], 3); 124 } 125 126 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 127 { 128 return gs->sock->sk->sk_family; 129 } 130 131 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 132 __be32 addr, u8 vni[]) 133 { 134 struct hlist_head *vni_list_head; 135 struct geneve_dev_node *node; 136 __u32 hash; 137 138 /* Find the device for this VNI */ 139 hash = geneve_net_vni_hash(vni); 140 vni_list_head = &gs->vni_list[hash]; 141 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 142 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 143 addr == node->geneve->cfg.info.key.u.ipv4.dst) 144 return node->geneve; 145 } 146 return NULL; 147 } 148 149 #if IS_ENABLED(CONFIG_IPV6) 150 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 151 struct in6_addr addr6, u8 vni[]) 152 { 153 struct hlist_head *vni_list_head; 154 struct geneve_dev_node *node; 155 __u32 hash; 156 157 /* Find the device for this VNI */ 158 hash = geneve_net_vni_hash(vni); 159 vni_list_head = &gs->vni_list[hash]; 160 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 161 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 162 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst)) 163 return node->geneve; 164 } 165 return NULL; 166 } 167 #endif 168 169 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 170 { 171 return (struct genevehdr *)(udp_hdr(skb) + 1); 172 } 173 174 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 175 struct sk_buff *skb) 176 { 177 static u8 zero_vni[3]; 178 u8 *vni; 179 180 if (geneve_get_sk_family(gs) == AF_INET) { 181 struct iphdr *iph; 182 __be32 addr; 183 184 iph = ip_hdr(skb); /* outer IP header... */ 185 186 if (gs->collect_md) { 187 vni = zero_vni; 188 addr = 0; 189 } else { 190 vni = geneve_hdr(skb)->vni; 191 addr = iph->saddr; 192 } 193 194 return geneve_lookup(gs, addr, vni); 195 #if IS_ENABLED(CONFIG_IPV6) 196 } else if (geneve_get_sk_family(gs) == AF_INET6) { 197 static struct in6_addr zero_addr6; 198 struct ipv6hdr *ip6h; 199 struct in6_addr addr6; 200 201 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 202 203 if (gs->collect_md) { 204 vni = zero_vni; 205 addr6 = zero_addr6; 206 } else { 207 vni = geneve_hdr(skb)->vni; 208 addr6 = ip6h->saddr; 209 } 210 211 return geneve6_lookup(gs, addr6, vni); 212 #endif 213 } 214 return NULL; 215 } 216 217 /* geneve receive/decap routine */ 218 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 219 struct sk_buff *skb) 220 { 221 struct genevehdr *gnvh = geneve_hdr(skb); 222 struct metadata_dst *tun_dst = NULL; 223 unsigned int len; 224 int err = 0; 225 void *oiph; 226 227 if (ip_tunnel_collect_metadata() || gs->collect_md) { 228 __be16 flags; 229 230 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) | 231 (gnvh->critical ? TUNNEL_CRIT_OPT : 0); 232 233 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 234 vni_to_tunnel_id(gnvh->vni), 235 gnvh->opt_len * 4); 236 if (!tun_dst) { 237 DEV_STATS_INC(geneve->dev, rx_dropped); 238 goto drop; 239 } 240 /* Update tunnel dst according to Geneve options. */ 241 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 242 gnvh->options, gnvh->opt_len * 4, 243 TUNNEL_GENEVE_OPT); 244 } else { 245 /* Drop packets w/ critical options, 246 * since we don't support any... 247 */ 248 if (gnvh->critical) { 249 DEV_STATS_INC(geneve->dev, rx_frame_errors); 250 DEV_STATS_INC(geneve->dev, rx_errors); 251 goto drop; 252 } 253 } 254 255 if (tun_dst) 256 skb_dst_set(skb, &tun_dst->dst); 257 258 if (gnvh->proto_type == htons(ETH_P_TEB)) { 259 skb_reset_mac_header(skb); 260 skb->protocol = eth_type_trans(skb, geneve->dev); 261 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 262 263 /* Ignore packet loops (and multicast echo) */ 264 if (ether_addr_equal(eth_hdr(skb)->h_source, 265 geneve->dev->dev_addr)) { 266 DEV_STATS_INC(geneve->dev, rx_errors); 267 goto drop; 268 } 269 } else { 270 skb_reset_mac_header(skb); 271 skb->dev = geneve->dev; 272 skb->pkt_type = PACKET_HOST; 273 } 274 275 oiph = skb_network_header(skb); 276 skb_reset_network_header(skb); 277 278 if (geneve_get_sk_family(gs) == AF_INET) 279 err = IP_ECN_decapsulate(oiph, skb); 280 #if IS_ENABLED(CONFIG_IPV6) 281 else 282 err = IP6_ECN_decapsulate(oiph, skb); 283 #endif 284 285 if (unlikely(err)) { 286 if (log_ecn_error) { 287 if (geneve_get_sk_family(gs) == AF_INET) 288 net_info_ratelimited("non-ECT from %pI4 " 289 "with TOS=%#x\n", 290 &((struct iphdr *)oiph)->saddr, 291 ((struct iphdr *)oiph)->tos); 292 #if IS_ENABLED(CONFIG_IPV6) 293 else 294 net_info_ratelimited("non-ECT from %pI6\n", 295 &((struct ipv6hdr *)oiph)->saddr); 296 #endif 297 } 298 if (err > 1) { 299 DEV_STATS_INC(geneve->dev, rx_frame_errors); 300 DEV_STATS_INC(geneve->dev, rx_errors); 301 goto drop; 302 } 303 } 304 305 len = skb->len; 306 err = gro_cells_receive(&geneve->gro_cells, skb); 307 if (likely(err == NET_RX_SUCCESS)) 308 dev_sw_netstats_rx_add(geneve->dev, len); 309 310 return; 311 drop: 312 /* Consume bad packet */ 313 kfree_skb(skb); 314 } 315 316 /* Setup stats when device is created */ 317 static int geneve_init(struct net_device *dev) 318 { 319 struct geneve_dev *geneve = netdev_priv(dev); 320 int err; 321 322 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 323 if (!dev->tstats) 324 return -ENOMEM; 325 326 err = gro_cells_init(&geneve->gro_cells, dev); 327 if (err) { 328 free_percpu(dev->tstats); 329 return err; 330 } 331 332 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 333 if (err) { 334 free_percpu(dev->tstats); 335 gro_cells_destroy(&geneve->gro_cells); 336 return err; 337 } 338 netdev_lockdep_set_classes(dev); 339 return 0; 340 } 341 342 static void geneve_uninit(struct net_device *dev) 343 { 344 struct geneve_dev *geneve = netdev_priv(dev); 345 346 dst_cache_destroy(&geneve->cfg.info.dst_cache); 347 gro_cells_destroy(&geneve->gro_cells); 348 free_percpu(dev->tstats); 349 } 350 351 /* Callback from net/ipv4/udp.c to receive packets */ 352 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 353 { 354 struct genevehdr *geneveh; 355 struct geneve_dev *geneve; 356 struct geneve_sock *gs; 357 __be16 inner_proto; 358 int opts_len; 359 360 /* Need UDP and Geneve header to be present */ 361 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 362 goto drop; 363 364 /* Return packets with reserved bits set */ 365 geneveh = geneve_hdr(skb); 366 if (unlikely(geneveh->ver != GENEVE_VER)) 367 goto drop; 368 369 gs = rcu_dereference_sk_user_data(sk); 370 if (!gs) 371 goto drop; 372 373 geneve = geneve_lookup_skb(gs, skb); 374 if (!geneve) 375 goto drop; 376 377 inner_proto = geneveh->proto_type; 378 379 if (unlikely((!geneve->cfg.inner_proto_inherit && 380 inner_proto != htons(ETH_P_TEB)))) { 381 DEV_STATS_INC(geneve->dev, rx_dropped); 382 goto drop; 383 } 384 385 opts_len = geneveh->opt_len * 4; 386 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto, 387 !net_eq(geneve->net, dev_net(geneve->dev)))) { 388 DEV_STATS_INC(geneve->dev, rx_dropped); 389 goto drop; 390 } 391 392 geneve_rx(geneve, gs, skb); 393 return 0; 394 395 drop: 396 /* Consume bad packet */ 397 kfree_skb(skb); 398 return 0; 399 } 400 401 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 402 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 403 { 404 struct genevehdr *geneveh; 405 struct geneve_sock *gs; 406 u8 zero_vni[3] = { 0 }; 407 u8 *vni = zero_vni; 408 409 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 410 return -EINVAL; 411 412 geneveh = geneve_hdr(skb); 413 if (geneveh->ver != GENEVE_VER) 414 return -EINVAL; 415 416 if (geneveh->proto_type != htons(ETH_P_TEB)) 417 return -EINVAL; 418 419 gs = rcu_dereference_sk_user_data(sk); 420 if (!gs) 421 return -ENOENT; 422 423 if (geneve_get_sk_family(gs) == AF_INET) { 424 struct iphdr *iph = ip_hdr(skb); 425 __be32 addr4 = 0; 426 427 if (!gs->collect_md) { 428 vni = geneve_hdr(skb)->vni; 429 addr4 = iph->daddr; 430 } 431 432 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 433 } 434 435 #if IS_ENABLED(CONFIG_IPV6) 436 if (geneve_get_sk_family(gs) == AF_INET6) { 437 struct ipv6hdr *ip6h = ipv6_hdr(skb); 438 struct in6_addr addr6; 439 440 memset(&addr6, 0, sizeof(struct in6_addr)); 441 442 if (!gs->collect_md) { 443 vni = geneve_hdr(skb)->vni; 444 addr6 = ip6h->daddr; 445 } 446 447 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 448 } 449 #endif 450 451 return -EPFNOSUPPORT; 452 } 453 454 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 455 __be16 port, bool ipv6_rx_csum) 456 { 457 struct socket *sock; 458 struct udp_port_cfg udp_conf; 459 int err; 460 461 memset(&udp_conf, 0, sizeof(udp_conf)); 462 463 if (ipv6) { 464 udp_conf.family = AF_INET6; 465 udp_conf.ipv6_v6only = 1; 466 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 467 } else { 468 udp_conf.family = AF_INET; 469 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 470 } 471 472 udp_conf.local_udp_port = port; 473 474 /* Open UDP socket */ 475 err = udp_sock_create(net, &udp_conf, &sock); 476 if (err < 0) 477 return ERR_PTR(err); 478 479 udp_allow_gso(sock->sk); 480 return sock; 481 } 482 483 static int geneve_hlen(struct genevehdr *gh) 484 { 485 return sizeof(*gh) + gh->opt_len * 4; 486 } 487 488 static struct sk_buff *geneve_gro_receive(struct sock *sk, 489 struct list_head *head, 490 struct sk_buff *skb) 491 { 492 struct sk_buff *pp = NULL; 493 struct sk_buff *p; 494 struct genevehdr *gh, *gh2; 495 unsigned int hlen, gh_len, off_gnv; 496 const struct packet_offload *ptype; 497 __be16 type; 498 int flush = 1; 499 500 off_gnv = skb_gro_offset(skb); 501 hlen = off_gnv + sizeof(*gh); 502 gh = skb_gro_header(skb, hlen, off_gnv); 503 if (unlikely(!gh)) 504 goto out; 505 506 if (gh->ver != GENEVE_VER || gh->oam) 507 goto out; 508 gh_len = geneve_hlen(gh); 509 510 hlen = off_gnv + gh_len; 511 if (skb_gro_header_hard(skb, hlen)) { 512 gh = skb_gro_header_slow(skb, hlen, off_gnv); 513 if (unlikely(!gh)) 514 goto out; 515 } 516 517 list_for_each_entry(p, head, list) { 518 if (!NAPI_GRO_CB(p)->same_flow) 519 continue; 520 521 gh2 = (struct genevehdr *)(p->data + off_gnv); 522 if (gh->opt_len != gh2->opt_len || 523 memcmp(gh, gh2, gh_len)) { 524 NAPI_GRO_CB(p)->same_flow = 0; 525 continue; 526 } 527 } 528 529 skb_gro_pull(skb, gh_len); 530 skb_gro_postpull_rcsum(skb, gh, gh_len); 531 type = gh->proto_type; 532 if (likely(type == htons(ETH_P_TEB))) 533 return call_gro_receive(eth_gro_receive, head, skb); 534 535 ptype = gro_find_receive_by_type(type); 536 if (!ptype) 537 goto out; 538 539 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 540 flush = 0; 541 542 out: 543 skb_gro_flush_final(skb, pp, flush); 544 545 return pp; 546 } 547 548 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 549 int nhoff) 550 { 551 struct genevehdr *gh; 552 struct packet_offload *ptype; 553 __be16 type; 554 int gh_len; 555 int err = -ENOSYS; 556 557 gh = (struct genevehdr *)(skb->data + nhoff); 558 gh_len = geneve_hlen(gh); 559 type = gh->proto_type; 560 561 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */ 562 if (likely(type == htons(ETH_P_TEB))) 563 return eth_gro_complete(skb, nhoff + gh_len); 564 565 ptype = gro_find_complete_by_type(type); 566 if (ptype) 567 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 568 569 skb_set_inner_mac_header(skb, nhoff + gh_len); 570 571 return err; 572 } 573 574 /* Create new listen socket if needed */ 575 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 576 bool ipv6, bool ipv6_rx_csum) 577 { 578 struct geneve_net *gn = net_generic(net, geneve_net_id); 579 struct geneve_sock *gs; 580 struct socket *sock; 581 struct udp_tunnel_sock_cfg tunnel_cfg; 582 int h; 583 584 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 585 if (!gs) 586 return ERR_PTR(-ENOMEM); 587 588 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 589 if (IS_ERR(sock)) { 590 kfree(gs); 591 return ERR_CAST(sock); 592 } 593 594 gs->sock = sock; 595 gs->refcnt = 1; 596 for (h = 0; h < VNI_HASH_SIZE; ++h) 597 INIT_HLIST_HEAD(&gs->vni_list[h]); 598 599 /* Initialize the geneve udp offloads structure */ 600 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 601 602 /* Mark socket as an encapsulation socket */ 603 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 604 tunnel_cfg.sk_user_data = gs; 605 tunnel_cfg.encap_type = 1; 606 tunnel_cfg.gro_receive = geneve_gro_receive; 607 tunnel_cfg.gro_complete = geneve_gro_complete; 608 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 609 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 610 tunnel_cfg.encap_destroy = NULL; 611 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 612 list_add(&gs->list, &gn->sock_list); 613 return gs; 614 } 615 616 static void __geneve_sock_release(struct geneve_sock *gs) 617 { 618 if (!gs || --gs->refcnt) 619 return; 620 621 list_del(&gs->list); 622 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 623 udp_tunnel_sock_release(gs->sock); 624 kfree_rcu(gs, rcu); 625 } 626 627 static void geneve_sock_release(struct geneve_dev *geneve) 628 { 629 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 630 #if IS_ENABLED(CONFIG_IPV6) 631 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 632 633 rcu_assign_pointer(geneve->sock6, NULL); 634 #endif 635 636 rcu_assign_pointer(geneve->sock4, NULL); 637 synchronize_net(); 638 639 __geneve_sock_release(gs4); 640 #if IS_ENABLED(CONFIG_IPV6) 641 __geneve_sock_release(gs6); 642 #endif 643 } 644 645 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 646 sa_family_t family, 647 __be16 dst_port) 648 { 649 struct geneve_sock *gs; 650 651 list_for_each_entry(gs, &gn->sock_list, list) { 652 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 653 geneve_get_sk_family(gs) == family) { 654 return gs; 655 } 656 } 657 return NULL; 658 } 659 660 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 661 { 662 struct net *net = geneve->net; 663 struct geneve_net *gn = net_generic(net, geneve_net_id); 664 struct geneve_dev_node *node; 665 struct geneve_sock *gs; 666 __u8 vni[3]; 667 __u32 hash; 668 669 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 670 if (gs) { 671 gs->refcnt++; 672 goto out; 673 } 674 675 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 676 geneve->cfg.use_udp6_rx_checksums); 677 if (IS_ERR(gs)) 678 return PTR_ERR(gs); 679 680 out: 681 gs->collect_md = geneve->cfg.collect_md; 682 #if IS_ENABLED(CONFIG_IPV6) 683 if (ipv6) { 684 rcu_assign_pointer(geneve->sock6, gs); 685 node = &geneve->hlist6; 686 } else 687 #endif 688 { 689 rcu_assign_pointer(geneve->sock4, gs); 690 node = &geneve->hlist4; 691 } 692 node->geneve = geneve; 693 694 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 695 hash = geneve_net_vni_hash(vni); 696 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 697 return 0; 698 } 699 700 static int geneve_open(struct net_device *dev) 701 { 702 struct geneve_dev *geneve = netdev_priv(dev); 703 bool metadata = geneve->cfg.collect_md; 704 bool ipv4, ipv6; 705 int ret = 0; 706 707 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 708 ipv4 = !ipv6 || metadata; 709 #if IS_ENABLED(CONFIG_IPV6) 710 if (ipv6) { 711 ret = geneve_sock_add(geneve, true); 712 if (ret < 0 && ret != -EAFNOSUPPORT) 713 ipv4 = false; 714 } 715 #endif 716 if (ipv4) 717 ret = geneve_sock_add(geneve, false); 718 if (ret < 0) 719 geneve_sock_release(geneve); 720 721 return ret; 722 } 723 724 static int geneve_stop(struct net_device *dev) 725 { 726 struct geneve_dev *geneve = netdev_priv(dev); 727 728 hlist_del_init_rcu(&geneve->hlist4.hlist); 729 #if IS_ENABLED(CONFIG_IPV6) 730 hlist_del_init_rcu(&geneve->hlist6.hlist); 731 #endif 732 geneve_sock_release(geneve); 733 return 0; 734 } 735 736 static void geneve_build_header(struct genevehdr *geneveh, 737 const struct ip_tunnel_info *info, 738 __be16 inner_proto) 739 { 740 geneveh->ver = GENEVE_VER; 741 geneveh->opt_len = info->options_len / 4; 742 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 743 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 744 geneveh->rsvd1 = 0; 745 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 746 geneveh->proto_type = inner_proto; 747 geneveh->rsvd2 = 0; 748 749 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 750 ip_tunnel_info_opts_get(geneveh->options, info); 751 } 752 753 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 754 const struct ip_tunnel_info *info, 755 bool xnet, int ip_hdr_len, 756 bool inner_proto_inherit) 757 { 758 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 759 struct genevehdr *gnvh; 760 __be16 inner_proto; 761 int min_headroom; 762 int err; 763 764 skb_reset_mac_header(skb); 765 skb_scrub_packet(skb, xnet); 766 767 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 768 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 769 err = skb_cow_head(skb, min_headroom); 770 if (unlikely(err)) 771 goto free_dst; 772 773 err = udp_tunnel_handle_offloads(skb, udp_sum); 774 if (err) 775 goto free_dst; 776 777 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 778 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB); 779 geneve_build_header(gnvh, info, inner_proto); 780 skb_set_inner_protocol(skb, inner_proto); 781 return 0; 782 783 free_dst: 784 dst_release(dst); 785 return err; 786 } 787 788 static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev, 789 const struct ip_tunnel_info *info, 790 bool *use_cache) 791 { 792 struct geneve_dev *geneve = netdev_priv(dev); 793 u8 dsfield; 794 795 dsfield = info->key.tos; 796 if (dsfield == 1 && !geneve->cfg.collect_md) { 797 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 798 *use_cache = false; 799 } 800 801 return dsfield; 802 } 803 804 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 805 struct geneve_dev *geneve, 806 const struct ip_tunnel_info *info) 807 { 808 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 809 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 810 const struct ip_tunnel_key *key = &info->key; 811 struct rtable *rt; 812 bool use_cache; 813 __u8 tos, ttl; 814 __be16 df = 0; 815 __be32 saddr; 816 __be16 sport; 817 int err; 818 819 if (!pskb_inet_may_pull(skb)) 820 return -EINVAL; 821 822 if (!gs4) 823 return -EIO; 824 825 use_cache = ip_tunnel_dst_cache_usable(skb, info); 826 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 827 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 828 829 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 830 &info->key, 831 sport, geneve->cfg.info.key.tp_dst, tos, 832 use_cache ? 833 (struct dst_cache *)&info->dst_cache : NULL); 834 if (IS_ERR(rt)) 835 return PTR_ERR(rt); 836 837 err = skb_tunnel_check_pmtu(skb, &rt->dst, 838 GENEVE_IPV4_HLEN + info->options_len, 839 netif_is_any_bridge_port(dev)); 840 if (err < 0) { 841 dst_release(&rt->dst); 842 return err; 843 } else if (err) { 844 struct ip_tunnel_info *info; 845 846 info = skb_tunnel_info(skb); 847 if (info) { 848 struct ip_tunnel_info *unclone; 849 850 unclone = skb_tunnel_info_unclone(skb); 851 if (unlikely(!unclone)) { 852 dst_release(&rt->dst); 853 return -ENOMEM; 854 } 855 856 unclone->key.u.ipv4.dst = saddr; 857 unclone->key.u.ipv4.src = info->key.u.ipv4.dst; 858 } 859 860 if (!pskb_may_pull(skb, ETH_HLEN)) { 861 dst_release(&rt->dst); 862 return -EINVAL; 863 } 864 865 skb->protocol = eth_type_trans(skb, geneve->dev); 866 __netif_rx(skb); 867 dst_release(&rt->dst); 868 return -EMSGSIZE; 869 } 870 871 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb); 872 if (geneve->cfg.collect_md) { 873 ttl = key->ttl; 874 875 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 876 } else { 877 if (geneve->cfg.ttl_inherit) 878 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 879 else 880 ttl = key->ttl; 881 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 882 883 if (geneve->cfg.df == GENEVE_DF_SET) { 884 df = htons(IP_DF); 885 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 886 struct ethhdr *eth = eth_hdr(skb); 887 888 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 889 df = htons(IP_DF); 890 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 891 struct iphdr *iph = ip_hdr(skb); 892 893 if (iph->frag_off & htons(IP_DF)) 894 df = htons(IP_DF); 895 } 896 } 897 } 898 899 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr), 900 geneve->cfg.inner_proto_inherit); 901 if (unlikely(err)) 902 return err; 903 904 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst, 905 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 906 !net_eq(geneve->net, dev_net(geneve->dev)), 907 !(info->key.tun_flags & TUNNEL_CSUM)); 908 return 0; 909 } 910 911 #if IS_ENABLED(CONFIG_IPV6) 912 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 913 struct geneve_dev *geneve, 914 const struct ip_tunnel_info *info) 915 { 916 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 917 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 918 const struct ip_tunnel_key *key = &info->key; 919 struct dst_entry *dst = NULL; 920 struct in6_addr saddr; 921 bool use_cache; 922 __u8 prio, ttl; 923 __be16 sport; 924 int err; 925 926 if (!pskb_inet_may_pull(skb)) 927 return -EINVAL; 928 929 if (!gs6) 930 return -EIO; 931 932 use_cache = ip_tunnel_dst_cache_usable(skb, info); 933 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 934 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 935 936 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 937 &saddr, key, sport, 938 geneve->cfg.info.key.tp_dst, prio, 939 use_cache ? 940 (struct dst_cache *)&info->dst_cache : NULL); 941 if (IS_ERR(dst)) 942 return PTR_ERR(dst); 943 944 err = skb_tunnel_check_pmtu(skb, dst, 945 GENEVE_IPV6_HLEN + info->options_len, 946 netif_is_any_bridge_port(dev)); 947 if (err < 0) { 948 dst_release(dst); 949 return err; 950 } else if (err) { 951 struct ip_tunnel_info *info = skb_tunnel_info(skb); 952 953 if (info) { 954 struct ip_tunnel_info *unclone; 955 956 unclone = skb_tunnel_info_unclone(skb); 957 if (unlikely(!unclone)) { 958 dst_release(dst); 959 return -ENOMEM; 960 } 961 962 unclone->key.u.ipv6.dst = saddr; 963 unclone->key.u.ipv6.src = info->key.u.ipv6.dst; 964 } 965 966 if (!pskb_may_pull(skb, ETH_HLEN)) { 967 dst_release(dst); 968 return -EINVAL; 969 } 970 971 skb->protocol = eth_type_trans(skb, geneve->dev); 972 __netif_rx(skb); 973 dst_release(dst); 974 return -EMSGSIZE; 975 } 976 977 prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb); 978 if (geneve->cfg.collect_md) { 979 ttl = key->ttl; 980 } else { 981 if (geneve->cfg.ttl_inherit) 982 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 983 else 984 ttl = key->ttl; 985 ttl = ttl ? : ip6_dst_hoplimit(dst); 986 } 987 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr), 988 geneve->cfg.inner_proto_inherit); 989 if (unlikely(err)) 990 return err; 991 992 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 993 &saddr, &key->u.ipv6.dst, prio, ttl, 994 info->key.label, sport, geneve->cfg.info.key.tp_dst, 995 !(info->key.tun_flags & TUNNEL_CSUM)); 996 return 0; 997 } 998 #endif 999 1000 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1001 { 1002 struct geneve_dev *geneve = netdev_priv(dev); 1003 struct ip_tunnel_info *info = NULL; 1004 int err; 1005 1006 if (geneve->cfg.collect_md) { 1007 info = skb_tunnel_info(skb); 1008 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1009 netdev_dbg(dev, "no tunnel metadata\n"); 1010 dev_kfree_skb(skb); 1011 DEV_STATS_INC(dev, tx_dropped); 1012 return NETDEV_TX_OK; 1013 } 1014 } else { 1015 info = &geneve->cfg.info; 1016 } 1017 1018 rcu_read_lock(); 1019 #if IS_ENABLED(CONFIG_IPV6) 1020 if (info->mode & IP_TUNNEL_INFO_IPV6) 1021 err = geneve6_xmit_skb(skb, dev, geneve, info); 1022 else 1023 #endif 1024 err = geneve_xmit_skb(skb, dev, geneve, info); 1025 rcu_read_unlock(); 1026 1027 if (likely(!err)) 1028 return NETDEV_TX_OK; 1029 1030 if (err != -EMSGSIZE) 1031 dev_kfree_skb(skb); 1032 1033 if (err == -ELOOP) 1034 DEV_STATS_INC(dev, collisions); 1035 else if (err == -ENETUNREACH) 1036 DEV_STATS_INC(dev, tx_carrier_errors); 1037 1038 DEV_STATS_INC(dev, tx_errors); 1039 return NETDEV_TX_OK; 1040 } 1041 1042 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1043 { 1044 if (new_mtu > dev->max_mtu) 1045 new_mtu = dev->max_mtu; 1046 else if (new_mtu < dev->min_mtu) 1047 new_mtu = dev->min_mtu; 1048 1049 dev->mtu = new_mtu; 1050 return 0; 1051 } 1052 1053 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1054 { 1055 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1056 struct geneve_dev *geneve = netdev_priv(dev); 1057 __be16 sport; 1058 1059 if (ip_tunnel_info_af(info) == AF_INET) { 1060 struct rtable *rt; 1061 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1062 bool use_cache; 1063 __be32 saddr; 1064 u8 tos; 1065 1066 if (!gs4) 1067 return -EIO; 1068 1069 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1070 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 1071 sport = udp_flow_src_port(geneve->net, skb, 1072 1, USHRT_MAX, true); 1073 1074 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 1075 &info->key, 1076 sport, geneve->cfg.info.key.tp_dst, 1077 tos, 1078 use_cache ? &info->dst_cache : NULL); 1079 if (IS_ERR(rt)) 1080 return PTR_ERR(rt); 1081 1082 ip_rt_put(rt); 1083 info->key.u.ipv4.src = saddr; 1084 #if IS_ENABLED(CONFIG_IPV6) 1085 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1086 struct dst_entry *dst; 1087 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1088 struct in6_addr saddr; 1089 bool use_cache; 1090 u8 prio; 1091 1092 if (!gs6) 1093 return -EIO; 1094 1095 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1096 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 1097 sport = udp_flow_src_port(geneve->net, skb, 1098 1, USHRT_MAX, true); 1099 1100 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 1101 &saddr, &info->key, sport, 1102 geneve->cfg.info.key.tp_dst, prio, 1103 use_cache ? &info->dst_cache : NULL); 1104 if (IS_ERR(dst)) 1105 return PTR_ERR(dst); 1106 1107 dst_release(dst); 1108 info->key.u.ipv6.src = saddr; 1109 #endif 1110 } else { 1111 return -EINVAL; 1112 } 1113 1114 info->key.tp_src = sport; 1115 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1116 return 0; 1117 } 1118 1119 static const struct net_device_ops geneve_netdev_ops = { 1120 .ndo_init = geneve_init, 1121 .ndo_uninit = geneve_uninit, 1122 .ndo_open = geneve_open, 1123 .ndo_stop = geneve_stop, 1124 .ndo_start_xmit = geneve_xmit, 1125 .ndo_get_stats64 = dev_get_tstats64, 1126 .ndo_change_mtu = geneve_change_mtu, 1127 .ndo_validate_addr = eth_validate_addr, 1128 .ndo_set_mac_address = eth_mac_addr, 1129 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1130 }; 1131 1132 static void geneve_get_drvinfo(struct net_device *dev, 1133 struct ethtool_drvinfo *drvinfo) 1134 { 1135 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1136 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1137 } 1138 1139 static const struct ethtool_ops geneve_ethtool_ops = { 1140 .get_drvinfo = geneve_get_drvinfo, 1141 .get_link = ethtool_op_get_link, 1142 }; 1143 1144 /* Info for udev, that this is a virtual tunnel endpoint */ 1145 static const struct device_type geneve_type = { 1146 .name = "geneve", 1147 }; 1148 1149 /* Calls the ndo_udp_tunnel_add of the caller in order to 1150 * supply the listening GENEVE udp ports. Callers are expected 1151 * to implement the ndo_udp_tunnel_add. 1152 */ 1153 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1154 { 1155 struct net *net = dev_net(dev); 1156 struct geneve_net *gn = net_generic(net, geneve_net_id); 1157 struct geneve_sock *gs; 1158 1159 rcu_read_lock(); 1160 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1161 if (push) { 1162 udp_tunnel_push_rx_port(dev, gs->sock, 1163 UDP_TUNNEL_TYPE_GENEVE); 1164 } else { 1165 udp_tunnel_drop_rx_port(dev, gs->sock, 1166 UDP_TUNNEL_TYPE_GENEVE); 1167 } 1168 } 1169 rcu_read_unlock(); 1170 } 1171 1172 /* Initialize the device structure. */ 1173 static void geneve_setup(struct net_device *dev) 1174 { 1175 ether_setup(dev); 1176 1177 dev->netdev_ops = &geneve_netdev_ops; 1178 dev->ethtool_ops = &geneve_ethtool_ops; 1179 dev->needs_free_netdev = true; 1180 1181 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1182 1183 dev->features |= NETIF_F_LLTX; 1184 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1185 dev->features |= NETIF_F_RXCSUM; 1186 dev->features |= NETIF_F_GSO_SOFTWARE; 1187 1188 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1189 dev->hw_features |= NETIF_F_RXCSUM; 1190 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1191 1192 /* MTU range: 68 - (something less than 65535) */ 1193 dev->min_mtu = ETH_MIN_MTU; 1194 /* The max_mtu calculation does not take account of GENEVE 1195 * options, to avoid excluding potentially valid 1196 * configurations. This will be further reduced by IPvX hdr size. 1197 */ 1198 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1199 1200 netif_keep_dst(dev); 1201 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1202 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1203 eth_hw_addr_random(dev); 1204 } 1205 1206 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1207 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, 1208 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1209 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1210 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1211 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1212 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1213 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1214 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1215 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1216 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1217 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1218 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1219 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1220 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1221 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, 1222 }; 1223 1224 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1225 struct netlink_ext_ack *extack) 1226 { 1227 if (tb[IFLA_ADDRESS]) { 1228 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1229 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1230 "Provided link layer address is not Ethernet"); 1231 return -EINVAL; 1232 } 1233 1234 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1235 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1236 "Provided Ethernet address is not unicast"); 1237 return -EADDRNOTAVAIL; 1238 } 1239 } 1240 1241 if (!data) { 1242 NL_SET_ERR_MSG(extack, 1243 "Not enough attributes provided to perform the operation"); 1244 return -EINVAL; 1245 } 1246 1247 if (data[IFLA_GENEVE_ID]) { 1248 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1249 1250 if (vni >= GENEVE_N_VID) { 1251 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1252 "Geneve ID must be lower than 16777216"); 1253 return -ERANGE; 1254 } 1255 } 1256 1257 if (data[IFLA_GENEVE_DF]) { 1258 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1259 1260 if (df < 0 || df > GENEVE_DF_MAX) { 1261 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1262 "Invalid DF attribute"); 1263 return -EINVAL; 1264 } 1265 } 1266 1267 return 0; 1268 } 1269 1270 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1271 const struct ip_tunnel_info *info, 1272 bool *tun_on_same_port, 1273 bool *tun_collect_md) 1274 { 1275 struct geneve_dev *geneve, *t = NULL; 1276 1277 *tun_on_same_port = false; 1278 *tun_collect_md = false; 1279 list_for_each_entry(geneve, &gn->geneve_list, next) { 1280 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1281 *tun_collect_md = geneve->cfg.collect_md; 1282 *tun_on_same_port = true; 1283 } 1284 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1285 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1286 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1287 t = geneve; 1288 } 1289 return t; 1290 } 1291 1292 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1293 { 1294 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1295 info->key.ttl || info->key.label || info->key.tp_src || 1296 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1297 } 1298 1299 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1300 struct ip_tunnel_info *b) 1301 { 1302 if (ip_tunnel_info_af(a) == AF_INET) 1303 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1304 else 1305 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1306 } 1307 1308 static int geneve_configure(struct net *net, struct net_device *dev, 1309 struct netlink_ext_ack *extack, 1310 const struct geneve_config *cfg) 1311 { 1312 struct geneve_net *gn = net_generic(net, geneve_net_id); 1313 struct geneve_dev *t, *geneve = netdev_priv(dev); 1314 const struct ip_tunnel_info *info = &cfg->info; 1315 bool tun_collect_md, tun_on_same_port; 1316 int err, encap_len; 1317 1318 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1319 NL_SET_ERR_MSG(extack, 1320 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1321 return -EINVAL; 1322 } 1323 1324 geneve->net = net; 1325 geneve->dev = dev; 1326 1327 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1328 if (t) 1329 return -EBUSY; 1330 1331 /* make enough headroom for basic scenario */ 1332 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1333 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1334 encap_len += sizeof(struct iphdr); 1335 dev->max_mtu -= sizeof(struct iphdr); 1336 } else { 1337 encap_len += sizeof(struct ipv6hdr); 1338 dev->max_mtu -= sizeof(struct ipv6hdr); 1339 } 1340 dev->needed_headroom = encap_len + ETH_HLEN; 1341 1342 if (cfg->collect_md) { 1343 if (tun_on_same_port) { 1344 NL_SET_ERR_MSG(extack, 1345 "There can be only one externally controlled device on a destination port"); 1346 return -EPERM; 1347 } 1348 } else { 1349 if (tun_collect_md) { 1350 NL_SET_ERR_MSG(extack, 1351 "There already exists an externally controlled device on this destination port"); 1352 return -EPERM; 1353 } 1354 } 1355 1356 dst_cache_reset(&geneve->cfg.info.dst_cache); 1357 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1358 1359 if (geneve->cfg.inner_proto_inherit) { 1360 dev->header_ops = NULL; 1361 dev->type = ARPHRD_NONE; 1362 dev->hard_header_len = 0; 1363 dev->addr_len = 0; 1364 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1365 } 1366 1367 err = register_netdevice(dev); 1368 if (err) 1369 return err; 1370 1371 list_add(&geneve->next, &gn->geneve_list); 1372 return 0; 1373 } 1374 1375 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1376 { 1377 memset(info, 0, sizeof(*info)); 1378 info->key.tp_dst = htons(dst_port); 1379 } 1380 1381 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1382 struct netlink_ext_ack *extack, 1383 struct geneve_config *cfg, bool changelink) 1384 { 1385 struct ip_tunnel_info *info = &cfg->info; 1386 int attrtype; 1387 1388 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1389 NL_SET_ERR_MSG(extack, 1390 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1391 return -EINVAL; 1392 } 1393 1394 if (data[IFLA_GENEVE_REMOTE]) { 1395 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1396 attrtype = IFLA_GENEVE_REMOTE; 1397 goto change_notsup; 1398 } 1399 1400 info->key.u.ipv4.dst = 1401 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1402 1403 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1404 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1405 "Remote IPv4 address cannot be Multicast"); 1406 return -EINVAL; 1407 } 1408 } 1409 1410 if (data[IFLA_GENEVE_REMOTE6]) { 1411 #if IS_ENABLED(CONFIG_IPV6) 1412 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1413 attrtype = IFLA_GENEVE_REMOTE6; 1414 goto change_notsup; 1415 } 1416 1417 info->mode = IP_TUNNEL_INFO_IPV6; 1418 info->key.u.ipv6.dst = 1419 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1420 1421 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1422 IPV6_ADDR_LINKLOCAL) { 1423 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1424 "Remote IPv6 address cannot be link-local"); 1425 return -EINVAL; 1426 } 1427 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1428 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1429 "Remote IPv6 address cannot be Multicast"); 1430 return -EINVAL; 1431 } 1432 info->key.tun_flags |= TUNNEL_CSUM; 1433 cfg->use_udp6_rx_checksums = true; 1434 #else 1435 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1436 "IPv6 support not enabled in the kernel"); 1437 return -EPFNOSUPPORT; 1438 #endif 1439 } 1440 1441 if (data[IFLA_GENEVE_ID]) { 1442 __u32 vni; 1443 __u8 tvni[3]; 1444 __be64 tunid; 1445 1446 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1447 tvni[0] = (vni & 0x00ff0000) >> 16; 1448 tvni[1] = (vni & 0x0000ff00) >> 8; 1449 tvni[2] = vni & 0x000000ff; 1450 1451 tunid = vni_to_tunnel_id(tvni); 1452 if (changelink && (tunid != info->key.tun_id)) { 1453 attrtype = IFLA_GENEVE_ID; 1454 goto change_notsup; 1455 } 1456 info->key.tun_id = tunid; 1457 } 1458 1459 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1460 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1461 cfg->ttl_inherit = true; 1462 else 1463 cfg->ttl_inherit = false; 1464 } else if (data[IFLA_GENEVE_TTL]) { 1465 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1466 cfg->ttl_inherit = false; 1467 } 1468 1469 if (data[IFLA_GENEVE_TOS]) 1470 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1471 1472 if (data[IFLA_GENEVE_DF]) 1473 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1474 1475 if (data[IFLA_GENEVE_LABEL]) { 1476 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1477 IPV6_FLOWLABEL_MASK; 1478 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1479 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1480 "Label attribute only applies for IPv6 Geneve devices"); 1481 return -EINVAL; 1482 } 1483 } 1484 1485 if (data[IFLA_GENEVE_PORT]) { 1486 if (changelink) { 1487 attrtype = IFLA_GENEVE_PORT; 1488 goto change_notsup; 1489 } 1490 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1491 } 1492 1493 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1494 if (changelink) { 1495 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1496 goto change_notsup; 1497 } 1498 cfg->collect_md = true; 1499 } 1500 1501 if (data[IFLA_GENEVE_UDP_CSUM]) { 1502 if (changelink) { 1503 attrtype = IFLA_GENEVE_UDP_CSUM; 1504 goto change_notsup; 1505 } 1506 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1507 info->key.tun_flags |= TUNNEL_CSUM; 1508 } 1509 1510 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1511 #if IS_ENABLED(CONFIG_IPV6) 1512 if (changelink) { 1513 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1514 goto change_notsup; 1515 } 1516 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1517 info->key.tun_flags &= ~TUNNEL_CSUM; 1518 #else 1519 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1520 "IPv6 support not enabled in the kernel"); 1521 return -EPFNOSUPPORT; 1522 #endif 1523 } 1524 1525 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1526 #if IS_ENABLED(CONFIG_IPV6) 1527 if (changelink) { 1528 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1529 goto change_notsup; 1530 } 1531 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1532 cfg->use_udp6_rx_checksums = false; 1533 #else 1534 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1535 "IPv6 support not enabled in the kernel"); 1536 return -EPFNOSUPPORT; 1537 #endif 1538 } 1539 1540 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { 1541 if (changelink) { 1542 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; 1543 goto change_notsup; 1544 } 1545 cfg->inner_proto_inherit = true; 1546 } 1547 1548 return 0; 1549 change_notsup: 1550 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1551 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported"); 1552 return -EOPNOTSUPP; 1553 } 1554 1555 static void geneve_link_config(struct net_device *dev, 1556 struct ip_tunnel_info *info, struct nlattr *tb[]) 1557 { 1558 struct geneve_dev *geneve = netdev_priv(dev); 1559 int ldev_mtu = 0; 1560 1561 if (tb[IFLA_MTU]) { 1562 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1563 return; 1564 } 1565 1566 switch (ip_tunnel_info_af(info)) { 1567 case AF_INET: { 1568 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1569 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1570 1571 if (!IS_ERR(rt) && rt->dst.dev) { 1572 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1573 ip_rt_put(rt); 1574 } 1575 break; 1576 } 1577 #if IS_ENABLED(CONFIG_IPV6) 1578 case AF_INET6: { 1579 struct rt6_info *rt; 1580 1581 if (!__in6_dev_get(dev)) 1582 break; 1583 1584 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1585 NULL, 0); 1586 1587 if (rt && rt->dst.dev) 1588 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1589 ip6_rt_put(rt); 1590 break; 1591 } 1592 #endif 1593 } 1594 1595 if (ldev_mtu <= 0) 1596 return; 1597 1598 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1599 } 1600 1601 static int geneve_newlink(struct net *net, struct net_device *dev, 1602 struct nlattr *tb[], struct nlattr *data[], 1603 struct netlink_ext_ack *extack) 1604 { 1605 struct geneve_config cfg = { 1606 .df = GENEVE_DF_UNSET, 1607 .use_udp6_rx_checksums = false, 1608 .ttl_inherit = false, 1609 .collect_md = false, 1610 }; 1611 int err; 1612 1613 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1614 err = geneve_nl2info(tb, data, extack, &cfg, false); 1615 if (err) 1616 return err; 1617 1618 err = geneve_configure(net, dev, extack, &cfg); 1619 if (err) 1620 return err; 1621 1622 geneve_link_config(dev, &cfg.info, tb); 1623 1624 return 0; 1625 } 1626 1627 /* Quiesces the geneve device data path for both TX and RX. 1628 * 1629 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1630 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1631 * to complete for the existing set of in-flight packets to be transmitted, 1632 * then we would have quiesced the transmit data path. All the future packets 1633 * will get dropped until we unquiesce the data path. 1634 * 1635 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1636 * if we set that to NULL under RCU and wait for synchronize_net() to 1637 * complete, then we would have quiesced the receive data path. 1638 */ 1639 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1640 struct geneve_sock **gs6) 1641 { 1642 *gs4 = rtnl_dereference(geneve->sock4); 1643 rcu_assign_pointer(geneve->sock4, NULL); 1644 if (*gs4) 1645 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1646 #if IS_ENABLED(CONFIG_IPV6) 1647 *gs6 = rtnl_dereference(geneve->sock6); 1648 rcu_assign_pointer(geneve->sock6, NULL); 1649 if (*gs6) 1650 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1651 #else 1652 *gs6 = NULL; 1653 #endif 1654 synchronize_net(); 1655 } 1656 1657 /* Resumes the geneve device data path for both TX and RX. */ 1658 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1659 struct geneve_sock __maybe_unused *gs6) 1660 { 1661 rcu_assign_pointer(geneve->sock4, gs4); 1662 if (gs4) 1663 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1664 #if IS_ENABLED(CONFIG_IPV6) 1665 rcu_assign_pointer(geneve->sock6, gs6); 1666 if (gs6) 1667 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1668 #endif 1669 synchronize_net(); 1670 } 1671 1672 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1673 struct nlattr *data[], 1674 struct netlink_ext_ack *extack) 1675 { 1676 struct geneve_dev *geneve = netdev_priv(dev); 1677 struct geneve_sock *gs4, *gs6; 1678 struct geneve_config cfg; 1679 int err; 1680 1681 /* If the geneve device is configured for metadata (or externally 1682 * controlled, for example, OVS), then nothing can be changed. 1683 */ 1684 if (geneve->cfg.collect_md) 1685 return -EOPNOTSUPP; 1686 1687 /* Start with the existing info. */ 1688 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1689 err = geneve_nl2info(tb, data, extack, &cfg, true); 1690 if (err) 1691 return err; 1692 1693 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1694 dst_cache_reset(&cfg.info.dst_cache); 1695 geneve_link_config(dev, &cfg.info, tb); 1696 } 1697 1698 geneve_quiesce(geneve, &gs4, &gs6); 1699 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1700 geneve_unquiesce(geneve, gs4, gs6); 1701 1702 return 0; 1703 } 1704 1705 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1706 { 1707 struct geneve_dev *geneve = netdev_priv(dev); 1708 1709 list_del(&geneve->next); 1710 unregister_netdevice_queue(dev, head); 1711 } 1712 1713 static size_t geneve_get_size(const struct net_device *dev) 1714 { 1715 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1716 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1717 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1718 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1719 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1720 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1721 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1722 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1723 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1724 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1725 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1726 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1727 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ 1728 0; 1729 } 1730 1731 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1732 { 1733 struct geneve_dev *geneve = netdev_priv(dev); 1734 struct ip_tunnel_info *info = &geneve->cfg.info; 1735 bool ttl_inherit = geneve->cfg.ttl_inherit; 1736 bool metadata = geneve->cfg.collect_md; 1737 __u8 tmp_vni[3]; 1738 __u32 vni; 1739 1740 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1741 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1742 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1743 goto nla_put_failure; 1744 1745 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1746 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1747 info->key.u.ipv4.dst)) 1748 goto nla_put_failure; 1749 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1750 !!(info->key.tun_flags & TUNNEL_CSUM))) 1751 goto nla_put_failure; 1752 1753 #if IS_ENABLED(CONFIG_IPV6) 1754 } else if (!metadata) { 1755 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1756 &info->key.u.ipv6.dst)) 1757 goto nla_put_failure; 1758 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1759 !(info->key.tun_flags & TUNNEL_CSUM))) 1760 goto nla_put_failure; 1761 #endif 1762 } 1763 1764 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1765 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1766 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1767 goto nla_put_failure; 1768 1769 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1770 goto nla_put_failure; 1771 1772 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1773 goto nla_put_failure; 1774 1775 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1776 goto nla_put_failure; 1777 1778 #if IS_ENABLED(CONFIG_IPV6) 1779 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1780 !geneve->cfg.use_udp6_rx_checksums)) 1781 goto nla_put_failure; 1782 #endif 1783 1784 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1785 goto nla_put_failure; 1786 1787 if (geneve->cfg.inner_proto_inherit && 1788 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) 1789 goto nla_put_failure; 1790 1791 return 0; 1792 1793 nla_put_failure: 1794 return -EMSGSIZE; 1795 } 1796 1797 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1798 .kind = "geneve", 1799 .maxtype = IFLA_GENEVE_MAX, 1800 .policy = geneve_policy, 1801 .priv_size = sizeof(struct geneve_dev), 1802 .setup = geneve_setup, 1803 .validate = geneve_validate, 1804 .newlink = geneve_newlink, 1805 .changelink = geneve_changelink, 1806 .dellink = geneve_dellink, 1807 .get_size = geneve_get_size, 1808 .fill_info = geneve_fill_info, 1809 }; 1810 1811 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1812 u8 name_assign_type, u16 dst_port) 1813 { 1814 struct nlattr *tb[IFLA_MAX + 1]; 1815 struct net_device *dev; 1816 LIST_HEAD(list_kill); 1817 int err; 1818 struct geneve_config cfg = { 1819 .df = GENEVE_DF_UNSET, 1820 .use_udp6_rx_checksums = true, 1821 .ttl_inherit = false, 1822 .collect_md = true, 1823 }; 1824 1825 memset(tb, 0, sizeof(tb)); 1826 dev = rtnl_create_link(net, name, name_assign_type, 1827 &geneve_link_ops, tb, NULL); 1828 if (IS_ERR(dev)) 1829 return dev; 1830 1831 init_tnl_info(&cfg.info, dst_port); 1832 err = geneve_configure(net, dev, NULL, &cfg); 1833 if (err) { 1834 free_netdev(dev); 1835 return ERR_PTR(err); 1836 } 1837 1838 /* openvswitch users expect packet sizes to be unrestricted, 1839 * so set the largest MTU we can. 1840 */ 1841 err = geneve_change_mtu(dev, IP_MAX_MTU); 1842 if (err) 1843 goto err; 1844 1845 err = rtnl_configure_link(dev, NULL, 0, NULL); 1846 if (err < 0) 1847 goto err; 1848 1849 return dev; 1850 err: 1851 geneve_dellink(dev, &list_kill); 1852 unregister_netdevice_many(&list_kill); 1853 return ERR_PTR(err); 1854 } 1855 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1856 1857 static int geneve_netdevice_event(struct notifier_block *unused, 1858 unsigned long event, void *ptr) 1859 { 1860 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1861 1862 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1863 geneve_offload_rx_ports(dev, true); 1864 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 1865 geneve_offload_rx_ports(dev, false); 1866 1867 return NOTIFY_DONE; 1868 } 1869 1870 static struct notifier_block geneve_notifier_block __read_mostly = { 1871 .notifier_call = geneve_netdevice_event, 1872 }; 1873 1874 static __net_init int geneve_init_net(struct net *net) 1875 { 1876 struct geneve_net *gn = net_generic(net, geneve_net_id); 1877 1878 INIT_LIST_HEAD(&gn->geneve_list); 1879 INIT_LIST_HEAD(&gn->sock_list); 1880 return 0; 1881 } 1882 1883 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1884 { 1885 struct geneve_net *gn = net_generic(net, geneve_net_id); 1886 struct geneve_dev *geneve, *next; 1887 struct net_device *dev, *aux; 1888 1889 /* gather any geneve devices that were moved into this ns */ 1890 for_each_netdev_safe(net, dev, aux) 1891 if (dev->rtnl_link_ops == &geneve_link_ops) 1892 unregister_netdevice_queue(dev, head); 1893 1894 /* now gather any other geneve devices that were created in this ns */ 1895 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1896 /* If geneve->dev is in the same netns, it was already added 1897 * to the list by the previous loop. 1898 */ 1899 if (!net_eq(dev_net(geneve->dev), net)) 1900 unregister_netdevice_queue(geneve->dev, head); 1901 } 1902 } 1903 1904 static void __net_exit geneve_exit_batch_rtnl(struct list_head *net_list, 1905 struct list_head *dev_to_kill) 1906 { 1907 struct net *net; 1908 1909 list_for_each_entry(net, net_list, exit_list) 1910 geneve_destroy_tunnels(net, dev_to_kill); 1911 } 1912 1913 static void __net_exit geneve_exit_net(struct net *net) 1914 { 1915 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1916 1917 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1918 } 1919 1920 static struct pernet_operations geneve_net_ops = { 1921 .init = geneve_init_net, 1922 .exit_batch_rtnl = geneve_exit_batch_rtnl, 1923 .exit = geneve_exit_net, 1924 .id = &geneve_net_id, 1925 .size = sizeof(struct geneve_net), 1926 }; 1927 1928 static int __init geneve_init_module(void) 1929 { 1930 int rc; 1931 1932 rc = register_pernet_subsys(&geneve_net_ops); 1933 if (rc) 1934 goto out1; 1935 1936 rc = register_netdevice_notifier(&geneve_notifier_block); 1937 if (rc) 1938 goto out2; 1939 1940 rc = rtnl_link_register(&geneve_link_ops); 1941 if (rc) 1942 goto out3; 1943 1944 return 0; 1945 out3: 1946 unregister_netdevice_notifier(&geneve_notifier_block); 1947 out2: 1948 unregister_pernet_subsys(&geneve_net_ops); 1949 out1: 1950 return rc; 1951 } 1952 late_initcall(geneve_init_module); 1953 1954 static void __exit geneve_cleanup_module(void) 1955 { 1956 rtnl_link_unregister(&geneve_link_ops); 1957 unregister_netdevice_notifier(&geneve_notifier_block); 1958 unregister_pernet_subsys(&geneve_net_ops); 1959 } 1960 module_exit(geneve_cleanup_module); 1961 1962 MODULE_LICENSE("GPL"); 1963 MODULE_VERSION(GENEVE_NETDEV_VER); 1964 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1965 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1966 MODULE_ALIAS_RTNL_LINK("geneve"); 1967