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 unsigned int len; 221 int err = 0; 222 void *oiph; 223 224 if (ip_tunnel_collect_metadata() || gs->collect_md) { 225 __be16 flags; 226 227 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) | 228 (gnvh->critical ? TUNNEL_CRIT_OPT : 0); 229 230 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 231 vni_to_tunnel_id(gnvh->vni), 232 gnvh->opt_len * 4); 233 if (!tun_dst) { 234 geneve->dev->stats.rx_dropped++; 235 goto drop; 236 } 237 /* Update tunnel dst according to Geneve options. */ 238 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 239 gnvh->options, gnvh->opt_len * 4, 240 TUNNEL_GENEVE_OPT); 241 } else { 242 /* Drop packets w/ critical options, 243 * since we don't support any... 244 */ 245 if (gnvh->critical) { 246 geneve->dev->stats.rx_frame_errors++; 247 geneve->dev->stats.rx_errors++; 248 goto drop; 249 } 250 } 251 252 skb_reset_mac_header(skb); 253 skb->protocol = eth_type_trans(skb, geneve->dev); 254 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 255 256 if (tun_dst) 257 skb_dst_set(skb, &tun_dst->dst); 258 259 /* Ignore packet loops (and multicast echo) */ 260 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) { 261 geneve->dev->stats.rx_errors++; 262 goto drop; 263 } 264 265 oiph = skb_network_header(skb); 266 skb_reset_network_header(skb); 267 268 if (geneve_get_sk_family(gs) == AF_INET) 269 err = IP_ECN_decapsulate(oiph, skb); 270 #if IS_ENABLED(CONFIG_IPV6) 271 else 272 err = IP6_ECN_decapsulate(oiph, skb); 273 #endif 274 275 if (unlikely(err)) { 276 if (log_ecn_error) { 277 if (geneve_get_sk_family(gs) == AF_INET) 278 net_info_ratelimited("non-ECT from %pI4 " 279 "with TOS=%#x\n", 280 &((struct iphdr *)oiph)->saddr, 281 ((struct iphdr *)oiph)->tos); 282 #if IS_ENABLED(CONFIG_IPV6) 283 else 284 net_info_ratelimited("non-ECT from %pI6\n", 285 &((struct ipv6hdr *)oiph)->saddr); 286 #endif 287 } 288 if (err > 1) { 289 ++geneve->dev->stats.rx_frame_errors; 290 ++geneve->dev->stats.rx_errors; 291 goto drop; 292 } 293 } 294 295 len = skb->len; 296 err = gro_cells_receive(&geneve->gro_cells, skb); 297 if (likely(err == NET_RX_SUCCESS)) 298 dev_sw_netstats_rx_add(geneve->dev, len); 299 300 return; 301 drop: 302 /* Consume bad packet */ 303 kfree_skb(skb); 304 } 305 306 /* Setup stats when device is created */ 307 static int geneve_init(struct net_device *dev) 308 { 309 struct geneve_dev *geneve = netdev_priv(dev); 310 int err; 311 312 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 313 if (!dev->tstats) 314 return -ENOMEM; 315 316 err = gro_cells_init(&geneve->gro_cells, dev); 317 if (err) { 318 free_percpu(dev->tstats); 319 return err; 320 } 321 322 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 323 if (err) { 324 free_percpu(dev->tstats); 325 gro_cells_destroy(&geneve->gro_cells); 326 return err; 327 } 328 return 0; 329 } 330 331 static void geneve_uninit(struct net_device *dev) 332 { 333 struct geneve_dev *geneve = netdev_priv(dev); 334 335 dst_cache_destroy(&geneve->cfg.info.dst_cache); 336 gro_cells_destroy(&geneve->gro_cells); 337 free_percpu(dev->tstats); 338 } 339 340 /* Callback from net/ipv4/udp.c to receive packets */ 341 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 342 { 343 struct genevehdr *geneveh; 344 struct geneve_dev *geneve; 345 struct geneve_sock *gs; 346 int opts_len; 347 348 /* Need UDP and Geneve header to be present */ 349 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 350 goto drop; 351 352 /* Return packets with reserved bits set */ 353 geneveh = geneve_hdr(skb); 354 if (unlikely(geneveh->ver != GENEVE_VER)) 355 goto drop; 356 357 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) 358 goto drop; 359 360 gs = rcu_dereference_sk_user_data(sk); 361 if (!gs) 362 goto drop; 363 364 geneve = geneve_lookup_skb(gs, skb); 365 if (!geneve) 366 goto drop; 367 368 opts_len = geneveh->opt_len * 4; 369 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, 370 htons(ETH_P_TEB), 371 !net_eq(geneve->net, dev_net(geneve->dev)))) { 372 geneve->dev->stats.rx_dropped++; 373 goto drop; 374 } 375 376 geneve_rx(geneve, gs, skb); 377 return 0; 378 379 drop: 380 /* Consume bad packet */ 381 kfree_skb(skb); 382 return 0; 383 } 384 385 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 386 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 387 { 388 struct genevehdr *geneveh; 389 struct geneve_sock *gs; 390 u8 zero_vni[3] = { 0 }; 391 u8 *vni = zero_vni; 392 393 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 394 return -EINVAL; 395 396 geneveh = geneve_hdr(skb); 397 if (geneveh->ver != GENEVE_VER) 398 return -EINVAL; 399 400 if (geneveh->proto_type != htons(ETH_P_TEB)) 401 return -EINVAL; 402 403 gs = rcu_dereference_sk_user_data(sk); 404 if (!gs) 405 return -ENOENT; 406 407 if (geneve_get_sk_family(gs) == AF_INET) { 408 struct iphdr *iph = ip_hdr(skb); 409 __be32 addr4 = 0; 410 411 if (!gs->collect_md) { 412 vni = geneve_hdr(skb)->vni; 413 addr4 = iph->daddr; 414 } 415 416 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 417 } 418 419 #if IS_ENABLED(CONFIG_IPV6) 420 if (geneve_get_sk_family(gs) == AF_INET6) { 421 struct ipv6hdr *ip6h = ipv6_hdr(skb); 422 struct in6_addr addr6; 423 424 memset(&addr6, 0, sizeof(struct in6_addr)); 425 426 if (!gs->collect_md) { 427 vni = geneve_hdr(skb)->vni; 428 addr6 = ip6h->daddr; 429 } 430 431 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 432 } 433 #endif 434 435 return -EPFNOSUPPORT; 436 } 437 438 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 439 __be16 port, bool ipv6_rx_csum) 440 { 441 struct socket *sock; 442 struct udp_port_cfg udp_conf; 443 int err; 444 445 memset(&udp_conf, 0, sizeof(udp_conf)); 446 447 if (ipv6) { 448 udp_conf.family = AF_INET6; 449 udp_conf.ipv6_v6only = 1; 450 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 451 } else { 452 udp_conf.family = AF_INET; 453 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 454 } 455 456 udp_conf.local_udp_port = port; 457 458 /* Open UDP socket */ 459 err = udp_sock_create(net, &udp_conf, &sock); 460 if (err < 0) 461 return ERR_PTR(err); 462 463 return sock; 464 } 465 466 static int geneve_hlen(struct genevehdr *gh) 467 { 468 return sizeof(*gh) + gh->opt_len * 4; 469 } 470 471 static struct sk_buff *geneve_gro_receive(struct sock *sk, 472 struct list_head *head, 473 struct sk_buff *skb) 474 { 475 struct sk_buff *pp = NULL; 476 struct sk_buff *p; 477 struct genevehdr *gh, *gh2; 478 unsigned int hlen, gh_len, off_gnv; 479 const struct packet_offload *ptype; 480 __be16 type; 481 int flush = 1; 482 483 off_gnv = skb_gro_offset(skb); 484 hlen = off_gnv + sizeof(*gh); 485 gh = skb_gro_header_fast(skb, off_gnv); 486 if (skb_gro_header_hard(skb, hlen)) { 487 gh = skb_gro_header_slow(skb, hlen, off_gnv); 488 if (unlikely(!gh)) 489 goto out; 490 } 491 492 if (gh->ver != GENEVE_VER || gh->oam) 493 goto out; 494 gh_len = geneve_hlen(gh); 495 496 hlen = off_gnv + gh_len; 497 if (skb_gro_header_hard(skb, hlen)) { 498 gh = skb_gro_header_slow(skb, hlen, off_gnv); 499 if (unlikely(!gh)) 500 goto out; 501 } 502 503 list_for_each_entry(p, head, list) { 504 if (!NAPI_GRO_CB(p)->same_flow) 505 continue; 506 507 gh2 = (struct genevehdr *)(p->data + off_gnv); 508 if (gh->opt_len != gh2->opt_len || 509 memcmp(gh, gh2, gh_len)) { 510 NAPI_GRO_CB(p)->same_flow = 0; 511 continue; 512 } 513 } 514 515 type = gh->proto_type; 516 517 rcu_read_lock(); 518 ptype = gro_find_receive_by_type(type); 519 if (!ptype) 520 goto out_unlock; 521 522 skb_gro_pull(skb, gh_len); 523 skb_gro_postpull_rcsum(skb, gh, gh_len); 524 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 525 flush = 0; 526 527 out_unlock: 528 rcu_read_unlock(); 529 out: 530 skb_gro_flush_final(skb, pp, flush); 531 532 return pp; 533 } 534 535 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 536 int nhoff) 537 { 538 struct genevehdr *gh; 539 struct packet_offload *ptype; 540 __be16 type; 541 int gh_len; 542 int err = -ENOSYS; 543 544 gh = (struct genevehdr *)(skb->data + nhoff); 545 gh_len = geneve_hlen(gh); 546 type = gh->proto_type; 547 548 rcu_read_lock(); 549 ptype = gro_find_complete_by_type(type); 550 if (ptype) 551 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 552 553 rcu_read_unlock(); 554 555 skb_set_inner_mac_header(skb, nhoff + gh_len); 556 557 return err; 558 } 559 560 /* Create new listen socket if needed */ 561 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 562 bool ipv6, bool ipv6_rx_csum) 563 { 564 struct geneve_net *gn = net_generic(net, geneve_net_id); 565 struct geneve_sock *gs; 566 struct socket *sock; 567 struct udp_tunnel_sock_cfg tunnel_cfg; 568 int h; 569 570 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 571 if (!gs) 572 return ERR_PTR(-ENOMEM); 573 574 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 575 if (IS_ERR(sock)) { 576 kfree(gs); 577 return ERR_CAST(sock); 578 } 579 580 gs->sock = sock; 581 gs->refcnt = 1; 582 for (h = 0; h < VNI_HASH_SIZE; ++h) 583 INIT_HLIST_HEAD(&gs->vni_list[h]); 584 585 /* Initialize the geneve udp offloads structure */ 586 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 587 588 /* Mark socket as an encapsulation socket */ 589 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 590 tunnel_cfg.sk_user_data = gs; 591 tunnel_cfg.encap_type = 1; 592 tunnel_cfg.gro_receive = geneve_gro_receive; 593 tunnel_cfg.gro_complete = geneve_gro_complete; 594 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 595 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 596 tunnel_cfg.encap_destroy = NULL; 597 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 598 list_add(&gs->list, &gn->sock_list); 599 return gs; 600 } 601 602 static void __geneve_sock_release(struct geneve_sock *gs) 603 { 604 if (!gs || --gs->refcnt) 605 return; 606 607 list_del(&gs->list); 608 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 609 udp_tunnel_sock_release(gs->sock); 610 kfree_rcu(gs, rcu); 611 } 612 613 static void geneve_sock_release(struct geneve_dev *geneve) 614 { 615 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 616 #if IS_ENABLED(CONFIG_IPV6) 617 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 618 619 rcu_assign_pointer(geneve->sock6, NULL); 620 #endif 621 622 rcu_assign_pointer(geneve->sock4, NULL); 623 synchronize_net(); 624 625 __geneve_sock_release(gs4); 626 #if IS_ENABLED(CONFIG_IPV6) 627 __geneve_sock_release(gs6); 628 #endif 629 } 630 631 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 632 sa_family_t family, 633 __be16 dst_port) 634 { 635 struct geneve_sock *gs; 636 637 list_for_each_entry(gs, &gn->sock_list, list) { 638 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 639 geneve_get_sk_family(gs) == family) { 640 return gs; 641 } 642 } 643 return NULL; 644 } 645 646 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 647 { 648 struct net *net = geneve->net; 649 struct geneve_net *gn = net_generic(net, geneve_net_id); 650 struct geneve_dev_node *node; 651 struct geneve_sock *gs; 652 __u8 vni[3]; 653 __u32 hash; 654 655 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 656 if (gs) { 657 gs->refcnt++; 658 goto out; 659 } 660 661 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 662 geneve->cfg.use_udp6_rx_checksums); 663 if (IS_ERR(gs)) 664 return PTR_ERR(gs); 665 666 out: 667 gs->collect_md = geneve->cfg.collect_md; 668 #if IS_ENABLED(CONFIG_IPV6) 669 if (ipv6) { 670 rcu_assign_pointer(geneve->sock6, gs); 671 node = &geneve->hlist6; 672 } else 673 #endif 674 { 675 rcu_assign_pointer(geneve->sock4, gs); 676 node = &geneve->hlist4; 677 } 678 node->geneve = geneve; 679 680 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 681 hash = geneve_net_vni_hash(vni); 682 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 683 return 0; 684 } 685 686 static int geneve_open(struct net_device *dev) 687 { 688 struct geneve_dev *geneve = netdev_priv(dev); 689 bool metadata = geneve->cfg.collect_md; 690 bool ipv4, ipv6; 691 int ret = 0; 692 693 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 694 ipv4 = !ipv6 || metadata; 695 #if IS_ENABLED(CONFIG_IPV6) 696 if (ipv6) { 697 ret = geneve_sock_add(geneve, true); 698 if (ret < 0 && ret != -EAFNOSUPPORT) 699 ipv4 = false; 700 } 701 #endif 702 if (ipv4) 703 ret = geneve_sock_add(geneve, false); 704 if (ret < 0) 705 geneve_sock_release(geneve); 706 707 return ret; 708 } 709 710 static int geneve_stop(struct net_device *dev) 711 { 712 struct geneve_dev *geneve = netdev_priv(dev); 713 714 hlist_del_init_rcu(&geneve->hlist4.hlist); 715 #if IS_ENABLED(CONFIG_IPV6) 716 hlist_del_init_rcu(&geneve->hlist6.hlist); 717 #endif 718 geneve_sock_release(geneve); 719 return 0; 720 } 721 722 static void geneve_build_header(struct genevehdr *geneveh, 723 const struct ip_tunnel_info *info) 724 { 725 geneveh->ver = GENEVE_VER; 726 geneveh->opt_len = info->options_len / 4; 727 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 728 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 729 geneveh->rsvd1 = 0; 730 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 731 geneveh->proto_type = htons(ETH_P_TEB); 732 geneveh->rsvd2 = 0; 733 734 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 735 ip_tunnel_info_opts_get(geneveh->options, info); 736 } 737 738 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 739 const struct ip_tunnel_info *info, 740 bool xnet, int ip_hdr_len) 741 { 742 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 743 struct genevehdr *gnvh; 744 int min_headroom; 745 int err; 746 747 skb_reset_mac_header(skb); 748 skb_scrub_packet(skb, xnet); 749 750 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 751 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 752 err = skb_cow_head(skb, min_headroom); 753 if (unlikely(err)) 754 goto free_dst; 755 756 err = udp_tunnel_handle_offloads(skb, udp_sum); 757 if (err) 758 goto free_dst; 759 760 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 761 geneve_build_header(gnvh, info); 762 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 763 return 0; 764 765 free_dst: 766 dst_release(dst); 767 return err; 768 } 769 770 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 771 struct net_device *dev, 772 struct geneve_sock *gs4, 773 struct flowi4 *fl4, 774 const struct ip_tunnel_info *info, 775 __be16 dport, __be16 sport) 776 { 777 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 778 struct geneve_dev *geneve = netdev_priv(dev); 779 struct dst_cache *dst_cache; 780 struct rtable *rt = NULL; 781 __u8 tos; 782 783 if (!gs4) 784 return ERR_PTR(-EIO); 785 786 memset(fl4, 0, sizeof(*fl4)); 787 fl4->flowi4_mark = skb->mark; 788 fl4->flowi4_proto = IPPROTO_UDP; 789 fl4->daddr = info->key.u.ipv4.dst; 790 fl4->saddr = info->key.u.ipv4.src; 791 fl4->fl4_dport = dport; 792 fl4->fl4_sport = sport; 793 794 tos = info->key.tos; 795 if ((tos == 1) && !geneve->cfg.collect_md) { 796 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 797 use_cache = false; 798 } 799 fl4->flowi4_tos = RT_TOS(tos); 800 801 dst_cache = (struct dst_cache *)&info->dst_cache; 802 if (use_cache) { 803 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 804 if (rt) 805 return rt; 806 } 807 rt = ip_route_output_key(geneve->net, fl4); 808 if (IS_ERR(rt)) { 809 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 810 return ERR_PTR(-ENETUNREACH); 811 } 812 if (rt->dst.dev == dev) { /* is this necessary? */ 813 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 814 ip_rt_put(rt); 815 return ERR_PTR(-ELOOP); 816 } 817 if (use_cache) 818 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 819 return rt; 820 } 821 822 #if IS_ENABLED(CONFIG_IPV6) 823 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 824 struct net_device *dev, 825 struct geneve_sock *gs6, 826 struct flowi6 *fl6, 827 const struct ip_tunnel_info *info, 828 __be16 dport, __be16 sport) 829 { 830 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 831 struct geneve_dev *geneve = netdev_priv(dev); 832 struct dst_entry *dst = NULL; 833 struct dst_cache *dst_cache; 834 __u8 prio; 835 836 if (!gs6) 837 return ERR_PTR(-EIO); 838 839 memset(fl6, 0, sizeof(*fl6)); 840 fl6->flowi6_mark = skb->mark; 841 fl6->flowi6_proto = IPPROTO_UDP; 842 fl6->daddr = info->key.u.ipv6.dst; 843 fl6->saddr = info->key.u.ipv6.src; 844 fl6->fl6_dport = dport; 845 fl6->fl6_sport = sport; 846 847 prio = info->key.tos; 848 if ((prio == 1) && !geneve->cfg.collect_md) { 849 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 850 use_cache = false; 851 } 852 853 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 854 info->key.label); 855 dst_cache = (struct dst_cache *)&info->dst_cache; 856 if (use_cache) { 857 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 858 if (dst) 859 return dst; 860 } 861 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, 862 NULL); 863 if (IS_ERR(dst)) { 864 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 865 return ERR_PTR(-ENETUNREACH); 866 } 867 if (dst->dev == dev) { /* is this necessary? */ 868 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 869 dst_release(dst); 870 return ERR_PTR(-ELOOP); 871 } 872 873 if (use_cache) 874 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 875 return dst; 876 } 877 #endif 878 879 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 880 struct geneve_dev *geneve, 881 const struct ip_tunnel_info *info) 882 { 883 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 884 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 885 const struct ip_tunnel_key *key = &info->key; 886 struct rtable *rt; 887 struct flowi4 fl4; 888 __u8 tos, ttl; 889 __be16 df = 0; 890 __be16 sport; 891 int err; 892 893 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 894 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 895 geneve->cfg.info.key.tp_dst, sport); 896 if (IS_ERR(rt)) 897 return PTR_ERR(rt); 898 899 err = skb_tunnel_check_pmtu(skb, &rt->dst, 900 GENEVE_IPV4_HLEN + info->options_len, 901 netif_is_any_bridge_port(dev)); 902 if (err < 0) { 903 dst_release(&rt->dst); 904 return err; 905 } else if (err) { 906 struct ip_tunnel_info *info; 907 908 info = skb_tunnel_info(skb); 909 if (info) { 910 info->key.u.ipv4.dst = fl4.saddr; 911 info->key.u.ipv4.src = fl4.daddr; 912 } 913 914 if (!pskb_may_pull(skb, ETH_HLEN)) { 915 dst_release(&rt->dst); 916 return -EINVAL; 917 } 918 919 skb->protocol = eth_type_trans(skb, geneve->dev); 920 netif_rx(skb); 921 dst_release(&rt->dst); 922 return -EMSGSIZE; 923 } 924 925 if (geneve->cfg.collect_md) { 926 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 927 ttl = key->ttl; 928 929 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 930 } else { 931 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); 932 if (geneve->cfg.ttl_inherit) 933 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 934 else 935 ttl = key->ttl; 936 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 937 938 if (geneve->cfg.df == GENEVE_DF_SET) { 939 df = htons(IP_DF); 940 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 941 struct ethhdr *eth = eth_hdr(skb); 942 943 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 944 df = htons(IP_DF); 945 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 946 struct iphdr *iph = ip_hdr(skb); 947 948 if (iph->frag_off & htons(IP_DF)) 949 df = htons(IP_DF); 950 } 951 } 952 } 953 954 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr)); 955 if (unlikely(err)) 956 return err; 957 958 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 959 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 960 !net_eq(geneve->net, dev_net(geneve->dev)), 961 !(info->key.tun_flags & TUNNEL_CSUM)); 962 return 0; 963 } 964 965 #if IS_ENABLED(CONFIG_IPV6) 966 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 967 struct geneve_dev *geneve, 968 const struct ip_tunnel_info *info) 969 { 970 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 971 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 972 const struct ip_tunnel_key *key = &info->key; 973 struct dst_entry *dst = NULL; 974 struct flowi6 fl6; 975 __u8 prio, ttl; 976 __be16 sport; 977 int err; 978 979 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 980 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 981 geneve->cfg.info.key.tp_dst, sport); 982 if (IS_ERR(dst)) 983 return PTR_ERR(dst); 984 985 err = skb_tunnel_check_pmtu(skb, dst, 986 GENEVE_IPV6_HLEN + info->options_len, 987 netif_is_any_bridge_port(dev)); 988 if (err < 0) { 989 dst_release(dst); 990 return err; 991 } else if (err) { 992 struct ip_tunnel_info *info = skb_tunnel_info(skb); 993 994 if (info) { 995 info->key.u.ipv6.dst = fl6.saddr; 996 info->key.u.ipv6.src = fl6.daddr; 997 } 998 999 if (!pskb_may_pull(skb, ETH_HLEN)) { 1000 dst_release(dst); 1001 return -EINVAL; 1002 } 1003 1004 skb->protocol = eth_type_trans(skb, geneve->dev); 1005 netif_rx(skb); 1006 dst_release(dst); 1007 return -EMSGSIZE; 1008 } 1009 1010 if (geneve->cfg.collect_md) { 1011 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 1012 ttl = key->ttl; 1013 } else { 1014 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1015 ip_hdr(skb), skb); 1016 if (geneve->cfg.ttl_inherit) 1017 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1018 else 1019 ttl = key->ttl; 1020 ttl = ttl ? : ip6_dst_hoplimit(dst); 1021 } 1022 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr)); 1023 if (unlikely(err)) 1024 return err; 1025 1026 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1027 &fl6.saddr, &fl6.daddr, prio, ttl, 1028 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1029 !(info->key.tun_flags & TUNNEL_CSUM)); 1030 return 0; 1031 } 1032 #endif 1033 1034 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1035 { 1036 struct geneve_dev *geneve = netdev_priv(dev); 1037 struct ip_tunnel_info *info = NULL; 1038 int err; 1039 1040 if (geneve->cfg.collect_md) { 1041 info = skb_tunnel_info(skb); 1042 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1043 netdev_dbg(dev, "no tunnel metadata\n"); 1044 dev_kfree_skb(skb); 1045 dev->stats.tx_dropped++; 1046 return NETDEV_TX_OK; 1047 } 1048 } else { 1049 info = &geneve->cfg.info; 1050 } 1051 1052 rcu_read_lock(); 1053 #if IS_ENABLED(CONFIG_IPV6) 1054 if (info->mode & IP_TUNNEL_INFO_IPV6) 1055 err = geneve6_xmit_skb(skb, dev, geneve, info); 1056 else 1057 #endif 1058 err = geneve_xmit_skb(skb, dev, geneve, info); 1059 rcu_read_unlock(); 1060 1061 if (likely(!err)) 1062 return NETDEV_TX_OK; 1063 1064 if (err != -EMSGSIZE) 1065 dev_kfree_skb(skb); 1066 1067 if (err == -ELOOP) 1068 dev->stats.collisions++; 1069 else if (err == -ENETUNREACH) 1070 dev->stats.tx_carrier_errors++; 1071 1072 dev->stats.tx_errors++; 1073 return NETDEV_TX_OK; 1074 } 1075 1076 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1077 { 1078 if (new_mtu > dev->max_mtu) 1079 new_mtu = dev->max_mtu; 1080 else if (new_mtu < dev->min_mtu) 1081 new_mtu = dev->min_mtu; 1082 1083 dev->mtu = new_mtu; 1084 return 0; 1085 } 1086 1087 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1088 { 1089 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1090 struct geneve_dev *geneve = netdev_priv(dev); 1091 __be16 sport; 1092 1093 if (ip_tunnel_info_af(info) == AF_INET) { 1094 struct rtable *rt; 1095 struct flowi4 fl4; 1096 1097 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1098 sport = udp_flow_src_port(geneve->net, skb, 1099 1, USHRT_MAX, true); 1100 1101 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 1102 geneve->cfg.info.key.tp_dst, sport); 1103 if (IS_ERR(rt)) 1104 return PTR_ERR(rt); 1105 1106 ip_rt_put(rt); 1107 info->key.u.ipv4.src = fl4.saddr; 1108 #if IS_ENABLED(CONFIG_IPV6) 1109 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1110 struct dst_entry *dst; 1111 struct flowi6 fl6; 1112 1113 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1114 sport = udp_flow_src_port(geneve->net, skb, 1115 1, USHRT_MAX, true); 1116 1117 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1118 geneve->cfg.info.key.tp_dst, sport); 1119 if (IS_ERR(dst)) 1120 return PTR_ERR(dst); 1121 1122 dst_release(dst); 1123 info->key.u.ipv6.src = fl6.saddr; 1124 #endif 1125 } else { 1126 return -EINVAL; 1127 } 1128 1129 info->key.tp_src = sport; 1130 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1131 return 0; 1132 } 1133 1134 static const struct net_device_ops geneve_netdev_ops = { 1135 .ndo_init = geneve_init, 1136 .ndo_uninit = geneve_uninit, 1137 .ndo_open = geneve_open, 1138 .ndo_stop = geneve_stop, 1139 .ndo_start_xmit = geneve_xmit, 1140 .ndo_get_stats64 = ip_tunnel_get_stats64, 1141 .ndo_change_mtu = geneve_change_mtu, 1142 .ndo_validate_addr = eth_validate_addr, 1143 .ndo_set_mac_address = eth_mac_addr, 1144 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1145 }; 1146 1147 static void geneve_get_drvinfo(struct net_device *dev, 1148 struct ethtool_drvinfo *drvinfo) 1149 { 1150 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1151 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1152 } 1153 1154 static const struct ethtool_ops geneve_ethtool_ops = { 1155 .get_drvinfo = geneve_get_drvinfo, 1156 .get_link = ethtool_op_get_link, 1157 }; 1158 1159 /* Info for udev, that this is a virtual tunnel endpoint */ 1160 static struct device_type geneve_type = { 1161 .name = "geneve", 1162 }; 1163 1164 /* Calls the ndo_udp_tunnel_add of the caller in order to 1165 * supply the listening GENEVE udp ports. Callers are expected 1166 * to implement the ndo_udp_tunnel_add. 1167 */ 1168 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1169 { 1170 struct net *net = dev_net(dev); 1171 struct geneve_net *gn = net_generic(net, geneve_net_id); 1172 struct geneve_sock *gs; 1173 1174 rcu_read_lock(); 1175 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1176 if (push) { 1177 udp_tunnel_push_rx_port(dev, gs->sock, 1178 UDP_TUNNEL_TYPE_GENEVE); 1179 } else { 1180 udp_tunnel_drop_rx_port(dev, gs->sock, 1181 UDP_TUNNEL_TYPE_GENEVE); 1182 } 1183 } 1184 rcu_read_unlock(); 1185 } 1186 1187 /* Initialize the device structure. */ 1188 static void geneve_setup(struct net_device *dev) 1189 { 1190 ether_setup(dev); 1191 1192 dev->netdev_ops = &geneve_netdev_ops; 1193 dev->ethtool_ops = &geneve_ethtool_ops; 1194 dev->needs_free_netdev = true; 1195 1196 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1197 1198 dev->features |= NETIF_F_LLTX; 1199 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1200 dev->features |= NETIF_F_RXCSUM; 1201 dev->features |= NETIF_F_GSO_SOFTWARE; 1202 1203 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 1204 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1205 1206 /* MTU range: 68 - (something less than 65535) */ 1207 dev->min_mtu = ETH_MIN_MTU; 1208 /* The max_mtu calculation does not take account of GENEVE 1209 * options, to avoid excluding potentially valid 1210 * configurations. This will be further reduced by IPvX hdr size. 1211 */ 1212 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1213 1214 netif_keep_dst(dev); 1215 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1216 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1217 eth_hw_addr_random(dev); 1218 } 1219 1220 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1221 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1222 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1223 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1224 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1225 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1226 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1227 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1228 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1229 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1230 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1231 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1232 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1233 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1234 }; 1235 1236 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1237 struct netlink_ext_ack *extack) 1238 { 1239 if (tb[IFLA_ADDRESS]) { 1240 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1241 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1242 "Provided link layer address is not Ethernet"); 1243 return -EINVAL; 1244 } 1245 1246 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1247 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1248 "Provided Ethernet address is not unicast"); 1249 return -EADDRNOTAVAIL; 1250 } 1251 } 1252 1253 if (!data) { 1254 NL_SET_ERR_MSG(extack, 1255 "Not enough attributes provided to perform the operation"); 1256 return -EINVAL; 1257 } 1258 1259 if (data[IFLA_GENEVE_ID]) { 1260 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1261 1262 if (vni >= GENEVE_N_VID) { 1263 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1264 "Geneve ID must be lower than 16777216"); 1265 return -ERANGE; 1266 } 1267 } 1268 1269 if (data[IFLA_GENEVE_DF]) { 1270 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1271 1272 if (df < 0 || df > GENEVE_DF_MAX) { 1273 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1274 "Invalid DF attribute"); 1275 return -EINVAL; 1276 } 1277 } 1278 1279 return 0; 1280 } 1281 1282 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1283 const struct ip_tunnel_info *info, 1284 bool *tun_on_same_port, 1285 bool *tun_collect_md) 1286 { 1287 struct geneve_dev *geneve, *t = NULL; 1288 1289 *tun_on_same_port = false; 1290 *tun_collect_md = false; 1291 list_for_each_entry(geneve, &gn->geneve_list, next) { 1292 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1293 *tun_collect_md = geneve->cfg.collect_md; 1294 *tun_on_same_port = true; 1295 } 1296 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1297 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1298 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1299 t = geneve; 1300 } 1301 return t; 1302 } 1303 1304 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1305 { 1306 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1307 info->key.ttl || info->key.label || info->key.tp_src || 1308 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1309 } 1310 1311 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1312 struct ip_tunnel_info *b) 1313 { 1314 if (ip_tunnel_info_af(a) == AF_INET) 1315 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1316 else 1317 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1318 } 1319 1320 static int geneve_configure(struct net *net, struct net_device *dev, 1321 struct netlink_ext_ack *extack, 1322 const struct geneve_config *cfg) 1323 { 1324 struct geneve_net *gn = net_generic(net, geneve_net_id); 1325 struct geneve_dev *t, *geneve = netdev_priv(dev); 1326 const struct ip_tunnel_info *info = &cfg->info; 1327 bool tun_collect_md, tun_on_same_port; 1328 int err, encap_len; 1329 1330 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1331 NL_SET_ERR_MSG(extack, 1332 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1333 return -EINVAL; 1334 } 1335 1336 geneve->net = net; 1337 geneve->dev = dev; 1338 1339 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1340 if (t) 1341 return -EBUSY; 1342 1343 /* make enough headroom for basic scenario */ 1344 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1345 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1346 encap_len += sizeof(struct iphdr); 1347 dev->max_mtu -= sizeof(struct iphdr); 1348 } else { 1349 encap_len += sizeof(struct ipv6hdr); 1350 dev->max_mtu -= sizeof(struct ipv6hdr); 1351 } 1352 dev->needed_headroom = encap_len + ETH_HLEN; 1353 1354 if (cfg->collect_md) { 1355 if (tun_on_same_port) { 1356 NL_SET_ERR_MSG(extack, 1357 "There can be only one externally controlled device on a destination port"); 1358 return -EPERM; 1359 } 1360 } else { 1361 if (tun_collect_md) { 1362 NL_SET_ERR_MSG(extack, 1363 "There already exists an externally controlled device on this destination port"); 1364 return -EPERM; 1365 } 1366 } 1367 1368 dst_cache_reset(&geneve->cfg.info.dst_cache); 1369 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1370 1371 err = register_netdevice(dev); 1372 if (err) 1373 return err; 1374 1375 list_add(&geneve->next, &gn->geneve_list); 1376 return 0; 1377 } 1378 1379 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1380 { 1381 memset(info, 0, sizeof(*info)); 1382 info->key.tp_dst = htons(dst_port); 1383 } 1384 1385 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1386 struct netlink_ext_ack *extack, 1387 struct geneve_config *cfg, bool changelink) 1388 { 1389 struct ip_tunnel_info *info = &cfg->info; 1390 int attrtype; 1391 1392 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1393 NL_SET_ERR_MSG(extack, 1394 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1395 return -EINVAL; 1396 } 1397 1398 if (data[IFLA_GENEVE_REMOTE]) { 1399 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1400 attrtype = IFLA_GENEVE_REMOTE; 1401 goto change_notsup; 1402 } 1403 1404 info->key.u.ipv4.dst = 1405 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1406 1407 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1408 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1409 "Remote IPv4 address cannot be Multicast"); 1410 return -EINVAL; 1411 } 1412 } 1413 1414 if (data[IFLA_GENEVE_REMOTE6]) { 1415 #if IS_ENABLED(CONFIG_IPV6) 1416 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1417 attrtype = IFLA_GENEVE_REMOTE6; 1418 goto change_notsup; 1419 } 1420 1421 info->mode = IP_TUNNEL_INFO_IPV6; 1422 info->key.u.ipv6.dst = 1423 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1424 1425 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1426 IPV6_ADDR_LINKLOCAL) { 1427 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1428 "Remote IPv6 address cannot be link-local"); 1429 return -EINVAL; 1430 } 1431 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1432 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1433 "Remote IPv6 address cannot be Multicast"); 1434 return -EINVAL; 1435 } 1436 info->key.tun_flags |= TUNNEL_CSUM; 1437 cfg->use_udp6_rx_checksums = true; 1438 #else 1439 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1440 "IPv6 support not enabled in the kernel"); 1441 return -EPFNOSUPPORT; 1442 #endif 1443 } 1444 1445 if (data[IFLA_GENEVE_ID]) { 1446 __u32 vni; 1447 __u8 tvni[3]; 1448 __be64 tunid; 1449 1450 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1451 tvni[0] = (vni & 0x00ff0000) >> 16; 1452 tvni[1] = (vni & 0x0000ff00) >> 8; 1453 tvni[2] = vni & 0x000000ff; 1454 1455 tunid = vni_to_tunnel_id(tvni); 1456 if (changelink && (tunid != info->key.tun_id)) { 1457 attrtype = IFLA_GENEVE_ID; 1458 goto change_notsup; 1459 } 1460 info->key.tun_id = tunid; 1461 } 1462 1463 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1464 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1465 cfg->ttl_inherit = true; 1466 else 1467 cfg->ttl_inherit = false; 1468 } else if (data[IFLA_GENEVE_TTL]) { 1469 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1470 cfg->ttl_inherit = false; 1471 } 1472 1473 if (data[IFLA_GENEVE_TOS]) 1474 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1475 1476 if (data[IFLA_GENEVE_DF]) 1477 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1478 1479 if (data[IFLA_GENEVE_LABEL]) { 1480 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1481 IPV6_FLOWLABEL_MASK; 1482 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1483 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1484 "Label attribute only applies for IPv6 Geneve devices"); 1485 return -EINVAL; 1486 } 1487 } 1488 1489 if (data[IFLA_GENEVE_PORT]) { 1490 if (changelink) { 1491 attrtype = IFLA_GENEVE_PORT; 1492 goto change_notsup; 1493 } 1494 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1495 } 1496 1497 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1498 if (changelink) { 1499 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1500 goto change_notsup; 1501 } 1502 cfg->collect_md = true; 1503 } 1504 1505 if (data[IFLA_GENEVE_UDP_CSUM]) { 1506 if (changelink) { 1507 attrtype = IFLA_GENEVE_UDP_CSUM; 1508 goto change_notsup; 1509 } 1510 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1511 info->key.tun_flags |= TUNNEL_CSUM; 1512 } 1513 1514 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1515 #if IS_ENABLED(CONFIG_IPV6) 1516 if (changelink) { 1517 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1518 goto change_notsup; 1519 } 1520 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1521 info->key.tun_flags &= ~TUNNEL_CSUM; 1522 #else 1523 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1524 "IPv6 support not enabled in the kernel"); 1525 return -EPFNOSUPPORT; 1526 #endif 1527 } 1528 1529 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1530 #if IS_ENABLED(CONFIG_IPV6) 1531 if (changelink) { 1532 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1533 goto change_notsup; 1534 } 1535 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1536 cfg->use_udp6_rx_checksums = false; 1537 #else 1538 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1539 "IPv6 support not enabled in the kernel"); 1540 return -EPFNOSUPPORT; 1541 #endif 1542 } 1543 1544 return 0; 1545 change_notsup: 1546 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1547 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported"); 1548 return -EOPNOTSUPP; 1549 } 1550 1551 static void geneve_link_config(struct net_device *dev, 1552 struct ip_tunnel_info *info, struct nlattr *tb[]) 1553 { 1554 struct geneve_dev *geneve = netdev_priv(dev); 1555 int ldev_mtu = 0; 1556 1557 if (tb[IFLA_MTU]) { 1558 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1559 return; 1560 } 1561 1562 switch (ip_tunnel_info_af(info)) { 1563 case AF_INET: { 1564 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1565 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1566 1567 if (!IS_ERR(rt) && rt->dst.dev) { 1568 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1569 ip_rt_put(rt); 1570 } 1571 break; 1572 } 1573 #if IS_ENABLED(CONFIG_IPV6) 1574 case AF_INET6: { 1575 struct rt6_info *rt; 1576 1577 if (!__in6_dev_get(dev)) 1578 break; 1579 1580 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1581 NULL, 0); 1582 1583 if (rt && rt->dst.dev) 1584 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1585 ip6_rt_put(rt); 1586 break; 1587 } 1588 #endif 1589 } 1590 1591 if (ldev_mtu <= 0) 1592 return; 1593 1594 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1595 } 1596 1597 static int geneve_newlink(struct net *net, struct net_device *dev, 1598 struct nlattr *tb[], struct nlattr *data[], 1599 struct netlink_ext_ack *extack) 1600 { 1601 struct geneve_config cfg = { 1602 .df = GENEVE_DF_UNSET, 1603 .use_udp6_rx_checksums = false, 1604 .ttl_inherit = false, 1605 .collect_md = false, 1606 }; 1607 int err; 1608 1609 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1610 err = geneve_nl2info(tb, data, extack, &cfg, false); 1611 if (err) 1612 return err; 1613 1614 err = geneve_configure(net, dev, extack, &cfg); 1615 if (err) 1616 return err; 1617 1618 geneve_link_config(dev, &cfg.info, tb); 1619 1620 return 0; 1621 } 1622 1623 /* Quiesces the geneve device data path for both TX and RX. 1624 * 1625 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1626 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1627 * to complete for the existing set of in-flight packets to be transmitted, 1628 * then we would have quiesced the transmit data path. All the future packets 1629 * will get dropped until we unquiesce the data path. 1630 * 1631 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1632 * if we set that to NULL under RCU and wait for synchronize_net() to 1633 * complete, then we would have quiesced the receive data path. 1634 */ 1635 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1636 struct geneve_sock **gs6) 1637 { 1638 *gs4 = rtnl_dereference(geneve->sock4); 1639 rcu_assign_pointer(geneve->sock4, NULL); 1640 if (*gs4) 1641 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1642 #if IS_ENABLED(CONFIG_IPV6) 1643 *gs6 = rtnl_dereference(geneve->sock6); 1644 rcu_assign_pointer(geneve->sock6, NULL); 1645 if (*gs6) 1646 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1647 #else 1648 *gs6 = NULL; 1649 #endif 1650 synchronize_net(); 1651 } 1652 1653 /* Resumes the geneve device data path for both TX and RX. */ 1654 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1655 struct geneve_sock __maybe_unused *gs6) 1656 { 1657 rcu_assign_pointer(geneve->sock4, gs4); 1658 if (gs4) 1659 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1660 #if IS_ENABLED(CONFIG_IPV6) 1661 rcu_assign_pointer(geneve->sock6, gs6); 1662 if (gs6) 1663 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1664 #endif 1665 synchronize_net(); 1666 } 1667 1668 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1669 struct nlattr *data[], 1670 struct netlink_ext_ack *extack) 1671 { 1672 struct geneve_dev *geneve = netdev_priv(dev); 1673 struct geneve_sock *gs4, *gs6; 1674 struct geneve_config cfg; 1675 int err; 1676 1677 /* If the geneve device is configured for metadata (or externally 1678 * controlled, for example, OVS), then nothing can be changed. 1679 */ 1680 if (geneve->cfg.collect_md) 1681 return -EOPNOTSUPP; 1682 1683 /* Start with the existing info. */ 1684 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1685 err = geneve_nl2info(tb, data, extack, &cfg, true); 1686 if (err) 1687 return err; 1688 1689 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1690 dst_cache_reset(&cfg.info.dst_cache); 1691 geneve_link_config(dev, &cfg.info, tb); 1692 } 1693 1694 geneve_quiesce(geneve, &gs4, &gs6); 1695 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1696 geneve_unquiesce(geneve, gs4, gs6); 1697 1698 return 0; 1699 } 1700 1701 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1702 { 1703 struct geneve_dev *geneve = netdev_priv(dev); 1704 1705 list_del(&geneve->next); 1706 unregister_netdevice_queue(dev, head); 1707 } 1708 1709 static size_t geneve_get_size(const struct net_device *dev) 1710 { 1711 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1712 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1713 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1714 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1715 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1716 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1717 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1718 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1719 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1720 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1721 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1722 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1723 0; 1724 } 1725 1726 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1727 { 1728 struct geneve_dev *geneve = netdev_priv(dev); 1729 struct ip_tunnel_info *info = &geneve->cfg.info; 1730 bool ttl_inherit = geneve->cfg.ttl_inherit; 1731 bool metadata = geneve->cfg.collect_md; 1732 __u8 tmp_vni[3]; 1733 __u32 vni; 1734 1735 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1736 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1737 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1738 goto nla_put_failure; 1739 1740 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1741 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1742 info->key.u.ipv4.dst)) 1743 goto nla_put_failure; 1744 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1745 !!(info->key.tun_flags & TUNNEL_CSUM))) 1746 goto nla_put_failure; 1747 1748 #if IS_ENABLED(CONFIG_IPV6) 1749 } else if (!metadata) { 1750 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1751 &info->key.u.ipv6.dst)) 1752 goto nla_put_failure; 1753 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1754 !(info->key.tun_flags & TUNNEL_CSUM))) 1755 goto nla_put_failure; 1756 #endif 1757 } 1758 1759 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1760 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1761 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1762 goto nla_put_failure; 1763 1764 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1765 goto nla_put_failure; 1766 1767 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1768 goto nla_put_failure; 1769 1770 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1771 goto nla_put_failure; 1772 1773 #if IS_ENABLED(CONFIG_IPV6) 1774 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1775 !geneve->cfg.use_udp6_rx_checksums)) 1776 goto nla_put_failure; 1777 #endif 1778 1779 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1780 goto nla_put_failure; 1781 1782 return 0; 1783 1784 nla_put_failure: 1785 return -EMSGSIZE; 1786 } 1787 1788 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1789 .kind = "geneve", 1790 .maxtype = IFLA_GENEVE_MAX, 1791 .policy = geneve_policy, 1792 .priv_size = sizeof(struct geneve_dev), 1793 .setup = geneve_setup, 1794 .validate = geneve_validate, 1795 .newlink = geneve_newlink, 1796 .changelink = geneve_changelink, 1797 .dellink = geneve_dellink, 1798 .get_size = geneve_get_size, 1799 .fill_info = geneve_fill_info, 1800 }; 1801 1802 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1803 u8 name_assign_type, u16 dst_port) 1804 { 1805 struct nlattr *tb[IFLA_MAX + 1]; 1806 struct net_device *dev; 1807 LIST_HEAD(list_kill); 1808 int err; 1809 struct geneve_config cfg = { 1810 .df = GENEVE_DF_UNSET, 1811 .use_udp6_rx_checksums = true, 1812 .ttl_inherit = false, 1813 .collect_md = true, 1814 }; 1815 1816 memset(tb, 0, sizeof(tb)); 1817 dev = rtnl_create_link(net, name, name_assign_type, 1818 &geneve_link_ops, tb, NULL); 1819 if (IS_ERR(dev)) 1820 return dev; 1821 1822 init_tnl_info(&cfg.info, dst_port); 1823 err = geneve_configure(net, dev, NULL, &cfg); 1824 if (err) { 1825 free_netdev(dev); 1826 return ERR_PTR(err); 1827 } 1828 1829 /* openvswitch users expect packet sizes to be unrestricted, 1830 * so set the largest MTU we can. 1831 */ 1832 err = geneve_change_mtu(dev, IP_MAX_MTU); 1833 if (err) 1834 goto err; 1835 1836 err = rtnl_configure_link(dev, NULL); 1837 if (err < 0) 1838 goto err; 1839 1840 return dev; 1841 err: 1842 geneve_dellink(dev, &list_kill); 1843 unregister_netdevice_many(&list_kill); 1844 return ERR_PTR(err); 1845 } 1846 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1847 1848 static int geneve_netdevice_event(struct notifier_block *unused, 1849 unsigned long event, void *ptr) 1850 { 1851 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1852 1853 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO || 1854 event == NETDEV_UDP_TUNNEL_DROP_INFO) { 1855 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO); 1856 } else if (event == NETDEV_UNREGISTER) { 1857 if (!dev->udp_tunnel_nic_info) 1858 geneve_offload_rx_ports(dev, false); 1859 } else if (event == NETDEV_REGISTER) { 1860 if (!dev->udp_tunnel_nic_info) 1861 geneve_offload_rx_ports(dev, true); 1862 } 1863 1864 return NOTIFY_DONE; 1865 } 1866 1867 static struct notifier_block geneve_notifier_block __read_mostly = { 1868 .notifier_call = geneve_netdevice_event, 1869 }; 1870 1871 static __net_init int geneve_init_net(struct net *net) 1872 { 1873 struct geneve_net *gn = net_generic(net, geneve_net_id); 1874 1875 INIT_LIST_HEAD(&gn->geneve_list); 1876 INIT_LIST_HEAD(&gn->sock_list); 1877 return 0; 1878 } 1879 1880 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1881 { 1882 struct geneve_net *gn = net_generic(net, geneve_net_id); 1883 struct geneve_dev *geneve, *next; 1884 struct net_device *dev, *aux; 1885 1886 /* gather any geneve devices that were moved into this ns */ 1887 for_each_netdev_safe(net, dev, aux) 1888 if (dev->rtnl_link_ops == &geneve_link_ops) 1889 unregister_netdevice_queue(dev, head); 1890 1891 /* now gather any other geneve devices that were created in this ns */ 1892 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1893 /* If geneve->dev is in the same netns, it was already added 1894 * to the list by the previous loop. 1895 */ 1896 if (!net_eq(dev_net(geneve->dev), net)) 1897 unregister_netdevice_queue(geneve->dev, head); 1898 } 1899 } 1900 1901 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1902 { 1903 struct net *net; 1904 LIST_HEAD(list); 1905 1906 rtnl_lock(); 1907 list_for_each_entry(net, net_list, exit_list) 1908 geneve_destroy_tunnels(net, &list); 1909 1910 /* unregister the devices gathered above */ 1911 unregister_netdevice_many(&list); 1912 rtnl_unlock(); 1913 1914 list_for_each_entry(net, net_list, exit_list) { 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 1921 static struct pernet_operations geneve_net_ops = { 1922 .init = geneve_init_net, 1923 .exit_batch = geneve_exit_batch_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