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 goto rx_error; 262 263 switch (skb_protocol(skb, true)) { 264 case htons(ETH_P_IP): 265 if (pskb_may_pull(skb, sizeof(struct iphdr))) 266 goto rx_error; 267 break; 268 case htons(ETH_P_IPV6): 269 if (pskb_may_pull(skb, sizeof(struct ipv6hdr))) 270 goto rx_error; 271 break; 272 default: 273 goto rx_error; 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 ++geneve->dev->stats.rx_frame_errors; 300 ++geneve->dev->stats.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 rx_error: 312 geneve->dev->stats.rx_errors++; 313 drop: 314 /* Consume bad packet */ 315 kfree_skb(skb); 316 } 317 318 /* Setup stats when device is created */ 319 static int geneve_init(struct net_device *dev) 320 { 321 struct geneve_dev *geneve = netdev_priv(dev); 322 int err; 323 324 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 325 if (!dev->tstats) 326 return -ENOMEM; 327 328 err = gro_cells_init(&geneve->gro_cells, dev); 329 if (err) { 330 free_percpu(dev->tstats); 331 return err; 332 } 333 334 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 335 if (err) { 336 free_percpu(dev->tstats); 337 gro_cells_destroy(&geneve->gro_cells); 338 return err; 339 } 340 return 0; 341 } 342 343 static void geneve_uninit(struct net_device *dev) 344 { 345 struct geneve_dev *geneve = netdev_priv(dev); 346 347 dst_cache_destroy(&geneve->cfg.info.dst_cache); 348 gro_cells_destroy(&geneve->gro_cells); 349 free_percpu(dev->tstats); 350 } 351 352 /* Callback from net/ipv4/udp.c to receive packets */ 353 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 354 { 355 struct genevehdr *geneveh; 356 struct geneve_dev *geneve; 357 struct geneve_sock *gs; 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 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) 370 goto drop; 371 372 gs = rcu_dereference_sk_user_data(sk); 373 if (!gs) 374 goto drop; 375 376 geneve = geneve_lookup_skb(gs, skb); 377 if (!geneve) 378 goto drop; 379 380 opts_len = geneveh->opt_len * 4; 381 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, 382 htons(ETH_P_TEB), 383 !net_eq(geneve->net, dev_net(geneve->dev)))) { 384 geneve->dev->stats.rx_dropped++; 385 goto drop; 386 } 387 388 geneve_rx(geneve, gs, skb); 389 return 0; 390 391 drop: 392 /* Consume bad packet */ 393 kfree_skb(skb); 394 return 0; 395 } 396 397 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 398 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 399 { 400 struct genevehdr *geneveh; 401 struct geneve_sock *gs; 402 u8 zero_vni[3] = { 0 }; 403 u8 *vni = zero_vni; 404 405 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 406 return -EINVAL; 407 408 geneveh = geneve_hdr(skb); 409 if (geneveh->ver != GENEVE_VER) 410 return -EINVAL; 411 412 if (geneveh->proto_type != htons(ETH_P_TEB)) 413 return -EINVAL; 414 415 gs = rcu_dereference_sk_user_data(sk); 416 if (!gs) 417 return -ENOENT; 418 419 if (geneve_get_sk_family(gs) == AF_INET) { 420 struct iphdr *iph = ip_hdr(skb); 421 __be32 addr4 = 0; 422 423 if (!gs->collect_md) { 424 vni = geneve_hdr(skb)->vni; 425 addr4 = iph->daddr; 426 } 427 428 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 429 } 430 431 #if IS_ENABLED(CONFIG_IPV6) 432 if (geneve_get_sk_family(gs) == AF_INET6) { 433 struct ipv6hdr *ip6h = ipv6_hdr(skb); 434 struct in6_addr addr6; 435 436 memset(&addr6, 0, sizeof(struct in6_addr)); 437 438 if (!gs->collect_md) { 439 vni = geneve_hdr(skb)->vni; 440 addr6 = ip6h->daddr; 441 } 442 443 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 444 } 445 #endif 446 447 return -EPFNOSUPPORT; 448 } 449 450 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 451 __be16 port, bool ipv6_rx_csum) 452 { 453 struct socket *sock; 454 struct udp_port_cfg udp_conf; 455 int err; 456 457 memset(&udp_conf, 0, sizeof(udp_conf)); 458 459 if (ipv6) { 460 udp_conf.family = AF_INET6; 461 udp_conf.ipv6_v6only = 1; 462 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 463 } else { 464 udp_conf.family = AF_INET; 465 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 466 } 467 468 udp_conf.local_udp_port = port; 469 470 /* Open UDP socket */ 471 err = udp_sock_create(net, &udp_conf, &sock); 472 if (err < 0) 473 return ERR_PTR(err); 474 475 return sock; 476 } 477 478 static int geneve_hlen(struct genevehdr *gh) 479 { 480 return sizeof(*gh) + gh->opt_len * 4; 481 } 482 483 static struct sk_buff *geneve_gro_receive(struct sock *sk, 484 struct list_head *head, 485 struct sk_buff *skb) 486 { 487 struct sk_buff *pp = NULL; 488 struct sk_buff *p; 489 struct genevehdr *gh, *gh2; 490 unsigned int hlen, gh_len, off_gnv; 491 const struct packet_offload *ptype; 492 __be16 type; 493 int flush = 1; 494 495 off_gnv = skb_gro_offset(skb); 496 hlen = off_gnv + sizeof(*gh); 497 gh = skb_gro_header_fast(skb, off_gnv); 498 if (skb_gro_header_hard(skb, hlen)) { 499 gh = skb_gro_header_slow(skb, hlen, off_gnv); 500 if (unlikely(!gh)) 501 goto out; 502 } 503 504 if (gh->ver != GENEVE_VER || gh->oam) 505 goto out; 506 gh_len = geneve_hlen(gh); 507 508 hlen = off_gnv + gh_len; 509 if (skb_gro_header_hard(skb, hlen)) { 510 gh = skb_gro_header_slow(skb, hlen, off_gnv); 511 if (unlikely(!gh)) 512 goto out; 513 } 514 515 list_for_each_entry(p, head, list) { 516 if (!NAPI_GRO_CB(p)->same_flow) 517 continue; 518 519 gh2 = (struct genevehdr *)(p->data + off_gnv); 520 if (gh->opt_len != gh2->opt_len || 521 memcmp(gh, gh2, gh_len)) { 522 NAPI_GRO_CB(p)->same_flow = 0; 523 continue; 524 } 525 } 526 527 type = gh->proto_type; 528 529 rcu_read_lock(); 530 ptype = gro_find_receive_by_type(type); 531 if (!ptype) 532 goto out_unlock; 533 534 skb_gro_pull(skb, gh_len); 535 skb_gro_postpull_rcsum(skb, gh, gh_len); 536 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 537 flush = 0; 538 539 out_unlock: 540 rcu_read_unlock(); 541 out: 542 skb_gro_flush_final(skb, pp, flush); 543 544 return pp; 545 } 546 547 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 548 int nhoff) 549 { 550 struct genevehdr *gh; 551 struct packet_offload *ptype; 552 __be16 type; 553 int gh_len; 554 int err = -ENOSYS; 555 556 gh = (struct genevehdr *)(skb->data + nhoff); 557 gh_len = geneve_hlen(gh); 558 type = gh->proto_type; 559 560 rcu_read_lock(); 561 ptype = gro_find_complete_by_type(type); 562 if (ptype) 563 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 564 565 rcu_read_unlock(); 566 567 skb_set_inner_mac_header(skb, nhoff + gh_len); 568 569 return err; 570 } 571 572 /* Create new listen socket if needed */ 573 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 574 bool ipv6, bool ipv6_rx_csum) 575 { 576 struct geneve_net *gn = net_generic(net, geneve_net_id); 577 struct geneve_sock *gs; 578 struct socket *sock; 579 struct udp_tunnel_sock_cfg tunnel_cfg; 580 int h; 581 582 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 583 if (!gs) 584 return ERR_PTR(-ENOMEM); 585 586 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 587 if (IS_ERR(sock)) { 588 kfree(gs); 589 return ERR_CAST(sock); 590 } 591 592 gs->sock = sock; 593 gs->refcnt = 1; 594 for (h = 0; h < VNI_HASH_SIZE; ++h) 595 INIT_HLIST_HEAD(&gs->vni_list[h]); 596 597 /* Initialize the geneve udp offloads structure */ 598 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 599 600 /* Mark socket as an encapsulation socket */ 601 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 602 tunnel_cfg.sk_user_data = gs; 603 tunnel_cfg.encap_type = 1; 604 tunnel_cfg.gro_receive = geneve_gro_receive; 605 tunnel_cfg.gro_complete = geneve_gro_complete; 606 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 607 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 608 tunnel_cfg.encap_destroy = NULL; 609 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 610 list_add(&gs->list, &gn->sock_list); 611 return gs; 612 } 613 614 static void __geneve_sock_release(struct geneve_sock *gs) 615 { 616 if (!gs || --gs->refcnt) 617 return; 618 619 list_del(&gs->list); 620 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 621 udp_tunnel_sock_release(gs->sock); 622 kfree_rcu(gs, rcu); 623 } 624 625 static void geneve_sock_release(struct geneve_dev *geneve) 626 { 627 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 628 #if IS_ENABLED(CONFIG_IPV6) 629 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 630 631 rcu_assign_pointer(geneve->sock6, NULL); 632 #endif 633 634 rcu_assign_pointer(geneve->sock4, NULL); 635 synchronize_net(); 636 637 __geneve_sock_release(gs4); 638 #if IS_ENABLED(CONFIG_IPV6) 639 __geneve_sock_release(gs6); 640 #endif 641 } 642 643 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 644 sa_family_t family, 645 __be16 dst_port) 646 { 647 struct geneve_sock *gs; 648 649 list_for_each_entry(gs, &gn->sock_list, list) { 650 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 651 geneve_get_sk_family(gs) == family) { 652 return gs; 653 } 654 } 655 return NULL; 656 } 657 658 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 659 { 660 struct net *net = geneve->net; 661 struct geneve_net *gn = net_generic(net, geneve_net_id); 662 struct geneve_dev_node *node; 663 struct geneve_sock *gs; 664 __u8 vni[3]; 665 __u32 hash; 666 667 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 668 if (gs) { 669 gs->refcnt++; 670 goto out; 671 } 672 673 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 674 geneve->cfg.use_udp6_rx_checksums); 675 if (IS_ERR(gs)) 676 return PTR_ERR(gs); 677 678 out: 679 gs->collect_md = geneve->cfg.collect_md; 680 #if IS_ENABLED(CONFIG_IPV6) 681 if (ipv6) { 682 rcu_assign_pointer(geneve->sock6, gs); 683 node = &geneve->hlist6; 684 } else 685 #endif 686 { 687 rcu_assign_pointer(geneve->sock4, gs); 688 node = &geneve->hlist4; 689 } 690 node->geneve = geneve; 691 692 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 693 hash = geneve_net_vni_hash(vni); 694 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 695 return 0; 696 } 697 698 static int geneve_open(struct net_device *dev) 699 { 700 struct geneve_dev *geneve = netdev_priv(dev); 701 bool metadata = geneve->cfg.collect_md; 702 bool ipv4, ipv6; 703 int ret = 0; 704 705 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 706 ipv4 = !ipv6 || metadata; 707 #if IS_ENABLED(CONFIG_IPV6) 708 if (ipv6) { 709 ret = geneve_sock_add(geneve, true); 710 if (ret < 0 && ret != -EAFNOSUPPORT) 711 ipv4 = false; 712 } 713 #endif 714 if (ipv4) 715 ret = geneve_sock_add(geneve, false); 716 if (ret < 0) 717 geneve_sock_release(geneve); 718 719 return ret; 720 } 721 722 static int geneve_stop(struct net_device *dev) 723 { 724 struct geneve_dev *geneve = netdev_priv(dev); 725 726 hlist_del_init_rcu(&geneve->hlist4.hlist); 727 #if IS_ENABLED(CONFIG_IPV6) 728 hlist_del_init_rcu(&geneve->hlist6.hlist); 729 #endif 730 geneve_sock_release(geneve); 731 return 0; 732 } 733 734 static void geneve_build_header(struct genevehdr *geneveh, 735 const struct ip_tunnel_info *info) 736 { 737 geneveh->ver = GENEVE_VER; 738 geneveh->opt_len = info->options_len / 4; 739 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 740 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 741 geneveh->rsvd1 = 0; 742 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 743 geneveh->proto_type = htons(ETH_P_TEB); 744 geneveh->rsvd2 = 0; 745 746 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 747 ip_tunnel_info_opts_get(geneveh->options, info); 748 } 749 750 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 751 const struct ip_tunnel_info *info, 752 bool xnet, int ip_hdr_len) 753 { 754 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 755 struct genevehdr *gnvh; 756 int min_headroom; 757 int err; 758 759 skb_reset_mac_header(skb); 760 skb_scrub_packet(skb, xnet); 761 762 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 763 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 764 err = skb_cow_head(skb, min_headroom); 765 if (unlikely(err)) 766 goto free_dst; 767 768 err = udp_tunnel_handle_offloads(skb, udp_sum); 769 if (err) 770 goto free_dst; 771 772 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 773 geneve_build_header(gnvh, info); 774 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 775 return 0; 776 777 free_dst: 778 dst_release(dst); 779 return err; 780 } 781 782 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 783 struct net_device *dev, 784 struct geneve_sock *gs4, 785 struct flowi4 *fl4, 786 const struct ip_tunnel_info *info, 787 __be16 dport, __be16 sport) 788 { 789 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 790 struct geneve_dev *geneve = netdev_priv(dev); 791 struct dst_cache *dst_cache; 792 struct rtable *rt = NULL; 793 __u8 tos; 794 795 if (!gs4) 796 return ERR_PTR(-EIO); 797 798 memset(fl4, 0, sizeof(*fl4)); 799 fl4->flowi4_mark = skb->mark; 800 fl4->flowi4_proto = IPPROTO_UDP; 801 fl4->daddr = info->key.u.ipv4.dst; 802 fl4->saddr = info->key.u.ipv4.src; 803 fl4->fl4_dport = dport; 804 fl4->fl4_sport = sport; 805 806 tos = info->key.tos; 807 if ((tos == 1) && !geneve->cfg.collect_md) { 808 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 809 use_cache = false; 810 } 811 fl4->flowi4_tos = RT_TOS(tos); 812 813 dst_cache = (struct dst_cache *)&info->dst_cache; 814 if (use_cache) { 815 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 816 if (rt) 817 return rt; 818 } 819 rt = ip_route_output_key(geneve->net, fl4); 820 if (IS_ERR(rt)) { 821 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 822 return ERR_PTR(-ENETUNREACH); 823 } 824 if (rt->dst.dev == dev) { /* is this necessary? */ 825 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 826 ip_rt_put(rt); 827 return ERR_PTR(-ELOOP); 828 } 829 if (use_cache) 830 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 831 return rt; 832 } 833 834 #if IS_ENABLED(CONFIG_IPV6) 835 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 836 struct net_device *dev, 837 struct geneve_sock *gs6, 838 struct flowi6 *fl6, 839 const struct ip_tunnel_info *info, 840 __be16 dport, __be16 sport) 841 { 842 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 843 struct geneve_dev *geneve = netdev_priv(dev); 844 struct dst_entry *dst = NULL; 845 struct dst_cache *dst_cache; 846 __u8 prio; 847 848 if (!gs6) 849 return ERR_PTR(-EIO); 850 851 memset(fl6, 0, sizeof(*fl6)); 852 fl6->flowi6_mark = skb->mark; 853 fl6->flowi6_proto = IPPROTO_UDP; 854 fl6->daddr = info->key.u.ipv6.dst; 855 fl6->saddr = info->key.u.ipv6.src; 856 fl6->fl6_dport = dport; 857 fl6->fl6_sport = sport; 858 859 prio = info->key.tos; 860 if ((prio == 1) && !geneve->cfg.collect_md) { 861 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 862 use_cache = false; 863 } 864 865 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 866 info->key.label); 867 dst_cache = (struct dst_cache *)&info->dst_cache; 868 if (use_cache) { 869 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 870 if (dst) 871 return dst; 872 } 873 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, 874 NULL); 875 if (IS_ERR(dst)) { 876 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 877 return ERR_PTR(-ENETUNREACH); 878 } 879 if (dst->dev == dev) { /* is this necessary? */ 880 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 881 dst_release(dst); 882 return ERR_PTR(-ELOOP); 883 } 884 885 if (use_cache) 886 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 887 return dst; 888 } 889 #endif 890 891 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 892 struct geneve_dev *geneve, 893 const struct ip_tunnel_info *info) 894 { 895 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 896 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 897 const struct ip_tunnel_key *key = &info->key; 898 struct rtable *rt; 899 struct flowi4 fl4; 900 __u8 tos, ttl; 901 __be16 df = 0; 902 __be16 sport; 903 int err; 904 905 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 906 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 907 geneve->cfg.info.key.tp_dst, sport); 908 if (IS_ERR(rt)) 909 return PTR_ERR(rt); 910 911 err = skb_tunnel_check_pmtu(skb, &rt->dst, 912 GENEVE_IPV4_HLEN + info->options_len, 913 netif_is_any_bridge_port(dev)); 914 if (err < 0) { 915 dst_release(&rt->dst); 916 return err; 917 } else if (err) { 918 struct ip_tunnel_info *info; 919 920 info = skb_tunnel_info(skb); 921 if (info) { 922 info->key.u.ipv4.dst = fl4.saddr; 923 info->key.u.ipv4.src = fl4.daddr; 924 } 925 926 if (!pskb_may_pull(skb, ETH_HLEN)) { 927 dst_release(&rt->dst); 928 return -EINVAL; 929 } 930 931 skb->protocol = eth_type_trans(skb, geneve->dev); 932 netif_rx(skb); 933 dst_release(&rt->dst); 934 return -EMSGSIZE; 935 } 936 937 if (geneve->cfg.collect_md) { 938 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 939 ttl = key->ttl; 940 941 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 942 } else { 943 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); 944 if (geneve->cfg.ttl_inherit) 945 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 946 else 947 ttl = key->ttl; 948 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 949 950 if (geneve->cfg.df == GENEVE_DF_SET) { 951 df = htons(IP_DF); 952 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 953 struct ethhdr *eth = eth_hdr(skb); 954 955 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 956 df = htons(IP_DF); 957 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 958 struct iphdr *iph = ip_hdr(skb); 959 960 if (iph->frag_off & htons(IP_DF)) 961 df = htons(IP_DF); 962 } 963 } 964 } 965 966 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr)); 967 if (unlikely(err)) 968 return err; 969 970 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 971 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 972 !net_eq(geneve->net, dev_net(geneve->dev)), 973 !(info->key.tun_flags & TUNNEL_CSUM)); 974 return 0; 975 } 976 977 #if IS_ENABLED(CONFIG_IPV6) 978 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 979 struct geneve_dev *geneve, 980 const struct ip_tunnel_info *info) 981 { 982 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 983 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 984 const struct ip_tunnel_key *key = &info->key; 985 struct dst_entry *dst = NULL; 986 struct flowi6 fl6; 987 __u8 prio, ttl; 988 __be16 sport; 989 int err; 990 991 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 992 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 993 geneve->cfg.info.key.tp_dst, sport); 994 if (IS_ERR(dst)) 995 return PTR_ERR(dst); 996 997 err = skb_tunnel_check_pmtu(skb, dst, 998 GENEVE_IPV6_HLEN + info->options_len, 999 netif_is_any_bridge_port(dev)); 1000 if (err < 0) { 1001 dst_release(dst); 1002 return err; 1003 } else if (err) { 1004 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1005 1006 if (info) { 1007 info->key.u.ipv6.dst = fl6.saddr; 1008 info->key.u.ipv6.src = fl6.daddr; 1009 } 1010 1011 if (!pskb_may_pull(skb, ETH_HLEN)) { 1012 dst_release(dst); 1013 return -EINVAL; 1014 } 1015 1016 skb->protocol = eth_type_trans(skb, geneve->dev); 1017 netif_rx(skb); 1018 dst_release(dst); 1019 return -EMSGSIZE; 1020 } 1021 1022 if (geneve->cfg.collect_md) { 1023 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 1024 ttl = key->ttl; 1025 } else { 1026 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1027 ip_hdr(skb), skb); 1028 if (geneve->cfg.ttl_inherit) 1029 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1030 else 1031 ttl = key->ttl; 1032 ttl = ttl ? : ip6_dst_hoplimit(dst); 1033 } 1034 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr)); 1035 if (unlikely(err)) 1036 return err; 1037 1038 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1039 &fl6.saddr, &fl6.daddr, prio, ttl, 1040 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1041 !(info->key.tun_flags & TUNNEL_CSUM)); 1042 return 0; 1043 } 1044 #endif 1045 1046 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1047 { 1048 struct geneve_dev *geneve = netdev_priv(dev); 1049 struct ip_tunnel_info *info = NULL; 1050 int err; 1051 1052 if (geneve->cfg.collect_md) { 1053 info = skb_tunnel_info(skb); 1054 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1055 netdev_dbg(dev, "no tunnel metadata\n"); 1056 dev_kfree_skb(skb); 1057 dev->stats.tx_dropped++; 1058 return NETDEV_TX_OK; 1059 } 1060 } else { 1061 info = &geneve->cfg.info; 1062 } 1063 1064 rcu_read_lock(); 1065 #if IS_ENABLED(CONFIG_IPV6) 1066 if (info->mode & IP_TUNNEL_INFO_IPV6) 1067 err = geneve6_xmit_skb(skb, dev, geneve, info); 1068 else 1069 #endif 1070 err = geneve_xmit_skb(skb, dev, geneve, info); 1071 rcu_read_unlock(); 1072 1073 if (likely(!err)) 1074 return NETDEV_TX_OK; 1075 1076 if (err != -EMSGSIZE) 1077 dev_kfree_skb(skb); 1078 1079 if (err == -ELOOP) 1080 dev->stats.collisions++; 1081 else if (err == -ENETUNREACH) 1082 dev->stats.tx_carrier_errors++; 1083 1084 dev->stats.tx_errors++; 1085 return NETDEV_TX_OK; 1086 } 1087 1088 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1089 { 1090 if (new_mtu > dev->max_mtu) 1091 new_mtu = dev->max_mtu; 1092 else if (new_mtu < dev->min_mtu) 1093 new_mtu = dev->min_mtu; 1094 1095 dev->mtu = new_mtu; 1096 return 0; 1097 } 1098 1099 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1100 { 1101 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1102 struct geneve_dev *geneve = netdev_priv(dev); 1103 __be16 sport; 1104 1105 if (ip_tunnel_info_af(info) == AF_INET) { 1106 struct rtable *rt; 1107 struct flowi4 fl4; 1108 1109 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1110 sport = udp_flow_src_port(geneve->net, skb, 1111 1, USHRT_MAX, true); 1112 1113 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 1114 geneve->cfg.info.key.tp_dst, sport); 1115 if (IS_ERR(rt)) 1116 return PTR_ERR(rt); 1117 1118 ip_rt_put(rt); 1119 info->key.u.ipv4.src = fl4.saddr; 1120 #if IS_ENABLED(CONFIG_IPV6) 1121 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1122 struct dst_entry *dst; 1123 struct flowi6 fl6; 1124 1125 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1126 sport = udp_flow_src_port(geneve->net, skb, 1127 1, USHRT_MAX, true); 1128 1129 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1130 geneve->cfg.info.key.tp_dst, sport); 1131 if (IS_ERR(dst)) 1132 return PTR_ERR(dst); 1133 1134 dst_release(dst); 1135 info->key.u.ipv6.src = fl6.saddr; 1136 #endif 1137 } else { 1138 return -EINVAL; 1139 } 1140 1141 info->key.tp_src = sport; 1142 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1143 return 0; 1144 } 1145 1146 static const struct net_device_ops geneve_netdev_ops = { 1147 .ndo_init = geneve_init, 1148 .ndo_uninit = geneve_uninit, 1149 .ndo_open = geneve_open, 1150 .ndo_stop = geneve_stop, 1151 .ndo_start_xmit = geneve_xmit, 1152 .ndo_get_stats64 = ip_tunnel_get_stats64, 1153 .ndo_change_mtu = geneve_change_mtu, 1154 .ndo_validate_addr = eth_validate_addr, 1155 .ndo_set_mac_address = eth_mac_addr, 1156 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1157 }; 1158 1159 static void geneve_get_drvinfo(struct net_device *dev, 1160 struct ethtool_drvinfo *drvinfo) 1161 { 1162 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1163 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1164 } 1165 1166 static const struct ethtool_ops geneve_ethtool_ops = { 1167 .get_drvinfo = geneve_get_drvinfo, 1168 .get_link = ethtool_op_get_link, 1169 }; 1170 1171 /* Info for udev, that this is a virtual tunnel endpoint */ 1172 static struct device_type geneve_type = { 1173 .name = "geneve", 1174 }; 1175 1176 /* Calls the ndo_udp_tunnel_add of the caller in order to 1177 * supply the listening GENEVE udp ports. Callers are expected 1178 * to implement the ndo_udp_tunnel_add. 1179 */ 1180 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1181 { 1182 struct net *net = dev_net(dev); 1183 struct geneve_net *gn = net_generic(net, geneve_net_id); 1184 struct geneve_sock *gs; 1185 1186 rcu_read_lock(); 1187 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1188 if (push) { 1189 udp_tunnel_push_rx_port(dev, gs->sock, 1190 UDP_TUNNEL_TYPE_GENEVE); 1191 } else { 1192 udp_tunnel_drop_rx_port(dev, gs->sock, 1193 UDP_TUNNEL_TYPE_GENEVE); 1194 } 1195 } 1196 rcu_read_unlock(); 1197 } 1198 1199 /* Initialize the device structure. */ 1200 static void geneve_setup(struct net_device *dev) 1201 { 1202 ether_setup(dev); 1203 1204 dev->netdev_ops = &geneve_netdev_ops; 1205 dev->ethtool_ops = &geneve_ethtool_ops; 1206 dev->needs_free_netdev = true; 1207 1208 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1209 1210 dev->features |= NETIF_F_LLTX; 1211 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1212 dev->features |= NETIF_F_RXCSUM; 1213 dev->features |= NETIF_F_GSO_SOFTWARE; 1214 1215 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 1216 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1217 1218 /* MTU range: 68 - (something less than 65535) */ 1219 dev->min_mtu = ETH_MIN_MTU; 1220 /* The max_mtu calculation does not take account of GENEVE 1221 * options, to avoid excluding potentially valid 1222 * configurations. This will be further reduced by IPvX hdr size. 1223 */ 1224 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1225 1226 netif_keep_dst(dev); 1227 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1228 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1229 eth_hw_addr_random(dev); 1230 } 1231 1232 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1233 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1234 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1235 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1236 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1237 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1238 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1239 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1240 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1241 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1242 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1243 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1244 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1245 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1246 }; 1247 1248 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1249 struct netlink_ext_ack *extack) 1250 { 1251 if (tb[IFLA_ADDRESS]) { 1252 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1253 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1254 "Provided link layer address is not Ethernet"); 1255 return -EINVAL; 1256 } 1257 1258 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1259 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1260 "Provided Ethernet address is not unicast"); 1261 return -EADDRNOTAVAIL; 1262 } 1263 } 1264 1265 if (!data) { 1266 NL_SET_ERR_MSG(extack, 1267 "Not enough attributes provided to perform the operation"); 1268 return -EINVAL; 1269 } 1270 1271 if (data[IFLA_GENEVE_ID]) { 1272 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1273 1274 if (vni >= GENEVE_N_VID) { 1275 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1276 "Geneve ID must be lower than 16777216"); 1277 return -ERANGE; 1278 } 1279 } 1280 1281 if (data[IFLA_GENEVE_DF]) { 1282 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1283 1284 if (df < 0 || df > GENEVE_DF_MAX) { 1285 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1286 "Invalid DF attribute"); 1287 return -EINVAL; 1288 } 1289 } 1290 1291 return 0; 1292 } 1293 1294 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1295 const struct ip_tunnel_info *info, 1296 bool *tun_on_same_port, 1297 bool *tun_collect_md) 1298 { 1299 struct geneve_dev *geneve, *t = NULL; 1300 1301 *tun_on_same_port = false; 1302 *tun_collect_md = false; 1303 list_for_each_entry(geneve, &gn->geneve_list, next) { 1304 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1305 *tun_collect_md = geneve->cfg.collect_md; 1306 *tun_on_same_port = true; 1307 } 1308 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1309 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1310 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1311 t = geneve; 1312 } 1313 return t; 1314 } 1315 1316 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1317 { 1318 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1319 info->key.ttl || info->key.label || info->key.tp_src || 1320 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1321 } 1322 1323 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1324 struct ip_tunnel_info *b) 1325 { 1326 if (ip_tunnel_info_af(a) == AF_INET) 1327 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1328 else 1329 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1330 } 1331 1332 static int geneve_configure(struct net *net, struct net_device *dev, 1333 struct netlink_ext_ack *extack, 1334 const struct geneve_config *cfg) 1335 { 1336 struct geneve_net *gn = net_generic(net, geneve_net_id); 1337 struct geneve_dev *t, *geneve = netdev_priv(dev); 1338 const struct ip_tunnel_info *info = &cfg->info; 1339 bool tun_collect_md, tun_on_same_port; 1340 int err, encap_len; 1341 1342 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1343 NL_SET_ERR_MSG(extack, 1344 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1345 return -EINVAL; 1346 } 1347 1348 geneve->net = net; 1349 geneve->dev = dev; 1350 1351 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1352 if (t) 1353 return -EBUSY; 1354 1355 /* make enough headroom for basic scenario */ 1356 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1357 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1358 encap_len += sizeof(struct iphdr); 1359 dev->max_mtu -= sizeof(struct iphdr); 1360 } else { 1361 encap_len += sizeof(struct ipv6hdr); 1362 dev->max_mtu -= sizeof(struct ipv6hdr); 1363 } 1364 dev->needed_headroom = encap_len + ETH_HLEN; 1365 1366 if (cfg->collect_md) { 1367 if (tun_on_same_port) { 1368 NL_SET_ERR_MSG(extack, 1369 "There can be only one externally controlled device on a destination port"); 1370 return -EPERM; 1371 } 1372 } else { 1373 if (tun_collect_md) { 1374 NL_SET_ERR_MSG(extack, 1375 "There already exists an externally controlled device on this destination port"); 1376 return -EPERM; 1377 } 1378 } 1379 1380 dst_cache_reset(&geneve->cfg.info.dst_cache); 1381 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1382 1383 err = register_netdevice(dev); 1384 if (err) 1385 return err; 1386 1387 list_add(&geneve->next, &gn->geneve_list); 1388 return 0; 1389 } 1390 1391 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1392 { 1393 memset(info, 0, sizeof(*info)); 1394 info->key.tp_dst = htons(dst_port); 1395 } 1396 1397 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1398 struct netlink_ext_ack *extack, 1399 struct geneve_config *cfg, bool changelink) 1400 { 1401 struct ip_tunnel_info *info = &cfg->info; 1402 int attrtype; 1403 1404 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1405 NL_SET_ERR_MSG(extack, 1406 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1407 return -EINVAL; 1408 } 1409 1410 if (data[IFLA_GENEVE_REMOTE]) { 1411 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1412 attrtype = IFLA_GENEVE_REMOTE; 1413 goto change_notsup; 1414 } 1415 1416 info->key.u.ipv4.dst = 1417 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1418 1419 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1420 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1421 "Remote IPv4 address cannot be Multicast"); 1422 return -EINVAL; 1423 } 1424 } 1425 1426 if (data[IFLA_GENEVE_REMOTE6]) { 1427 #if IS_ENABLED(CONFIG_IPV6) 1428 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1429 attrtype = IFLA_GENEVE_REMOTE6; 1430 goto change_notsup; 1431 } 1432 1433 info->mode = IP_TUNNEL_INFO_IPV6; 1434 info->key.u.ipv6.dst = 1435 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1436 1437 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1438 IPV6_ADDR_LINKLOCAL) { 1439 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1440 "Remote IPv6 address cannot be link-local"); 1441 return -EINVAL; 1442 } 1443 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1444 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1445 "Remote IPv6 address cannot be Multicast"); 1446 return -EINVAL; 1447 } 1448 info->key.tun_flags |= TUNNEL_CSUM; 1449 cfg->use_udp6_rx_checksums = true; 1450 #else 1451 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1452 "IPv6 support not enabled in the kernel"); 1453 return -EPFNOSUPPORT; 1454 #endif 1455 } 1456 1457 if (data[IFLA_GENEVE_ID]) { 1458 __u32 vni; 1459 __u8 tvni[3]; 1460 __be64 tunid; 1461 1462 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1463 tvni[0] = (vni & 0x00ff0000) >> 16; 1464 tvni[1] = (vni & 0x0000ff00) >> 8; 1465 tvni[2] = vni & 0x000000ff; 1466 1467 tunid = vni_to_tunnel_id(tvni); 1468 if (changelink && (tunid != info->key.tun_id)) { 1469 attrtype = IFLA_GENEVE_ID; 1470 goto change_notsup; 1471 } 1472 info->key.tun_id = tunid; 1473 } 1474 1475 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1476 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1477 cfg->ttl_inherit = true; 1478 else 1479 cfg->ttl_inherit = false; 1480 } else if (data[IFLA_GENEVE_TTL]) { 1481 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1482 cfg->ttl_inherit = false; 1483 } 1484 1485 if (data[IFLA_GENEVE_TOS]) 1486 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1487 1488 if (data[IFLA_GENEVE_DF]) 1489 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1490 1491 if (data[IFLA_GENEVE_LABEL]) { 1492 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1493 IPV6_FLOWLABEL_MASK; 1494 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1495 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1496 "Label attribute only applies for IPv6 Geneve devices"); 1497 return -EINVAL; 1498 } 1499 } 1500 1501 if (data[IFLA_GENEVE_PORT]) { 1502 if (changelink) { 1503 attrtype = IFLA_GENEVE_PORT; 1504 goto change_notsup; 1505 } 1506 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1507 } 1508 1509 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1510 if (changelink) { 1511 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1512 goto change_notsup; 1513 } 1514 cfg->collect_md = true; 1515 } 1516 1517 if (data[IFLA_GENEVE_UDP_CSUM]) { 1518 if (changelink) { 1519 attrtype = IFLA_GENEVE_UDP_CSUM; 1520 goto change_notsup; 1521 } 1522 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1523 info->key.tun_flags |= TUNNEL_CSUM; 1524 } 1525 1526 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1527 #if IS_ENABLED(CONFIG_IPV6) 1528 if (changelink) { 1529 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1530 goto change_notsup; 1531 } 1532 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1533 info->key.tun_flags &= ~TUNNEL_CSUM; 1534 #else 1535 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1536 "IPv6 support not enabled in the kernel"); 1537 return -EPFNOSUPPORT; 1538 #endif 1539 } 1540 1541 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1542 #if IS_ENABLED(CONFIG_IPV6) 1543 if (changelink) { 1544 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1545 goto change_notsup; 1546 } 1547 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1548 cfg->use_udp6_rx_checksums = false; 1549 #else 1550 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1551 "IPv6 support not enabled in the kernel"); 1552 return -EPFNOSUPPORT; 1553 #endif 1554 } 1555 1556 return 0; 1557 change_notsup: 1558 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1559 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported"); 1560 return -EOPNOTSUPP; 1561 } 1562 1563 static void geneve_link_config(struct net_device *dev, 1564 struct ip_tunnel_info *info, struct nlattr *tb[]) 1565 { 1566 struct geneve_dev *geneve = netdev_priv(dev); 1567 int ldev_mtu = 0; 1568 1569 if (tb[IFLA_MTU]) { 1570 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1571 return; 1572 } 1573 1574 switch (ip_tunnel_info_af(info)) { 1575 case AF_INET: { 1576 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1577 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1578 1579 if (!IS_ERR(rt) && rt->dst.dev) { 1580 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1581 ip_rt_put(rt); 1582 } 1583 break; 1584 } 1585 #if IS_ENABLED(CONFIG_IPV6) 1586 case AF_INET6: { 1587 struct rt6_info *rt; 1588 1589 if (!__in6_dev_get(dev)) 1590 break; 1591 1592 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1593 NULL, 0); 1594 1595 if (rt && rt->dst.dev) 1596 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1597 ip6_rt_put(rt); 1598 break; 1599 } 1600 #endif 1601 } 1602 1603 if (ldev_mtu <= 0) 1604 return; 1605 1606 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1607 } 1608 1609 static int geneve_newlink(struct net *net, struct net_device *dev, 1610 struct nlattr *tb[], struct nlattr *data[], 1611 struct netlink_ext_ack *extack) 1612 { 1613 struct geneve_config cfg = { 1614 .df = GENEVE_DF_UNSET, 1615 .use_udp6_rx_checksums = false, 1616 .ttl_inherit = false, 1617 .collect_md = false, 1618 }; 1619 int err; 1620 1621 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1622 err = geneve_nl2info(tb, data, extack, &cfg, false); 1623 if (err) 1624 return err; 1625 1626 err = geneve_configure(net, dev, extack, &cfg); 1627 if (err) 1628 return err; 1629 1630 geneve_link_config(dev, &cfg.info, tb); 1631 1632 return 0; 1633 } 1634 1635 /* Quiesces the geneve device data path for both TX and RX. 1636 * 1637 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1638 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1639 * to complete for the existing set of in-flight packets to be transmitted, 1640 * then we would have quiesced the transmit data path. All the future packets 1641 * will get dropped until we unquiesce the data path. 1642 * 1643 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1644 * if we set that to NULL under RCU and wait for synchronize_net() to 1645 * complete, then we would have quiesced the receive data path. 1646 */ 1647 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1648 struct geneve_sock **gs6) 1649 { 1650 *gs4 = rtnl_dereference(geneve->sock4); 1651 rcu_assign_pointer(geneve->sock4, NULL); 1652 if (*gs4) 1653 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1654 #if IS_ENABLED(CONFIG_IPV6) 1655 *gs6 = rtnl_dereference(geneve->sock6); 1656 rcu_assign_pointer(geneve->sock6, NULL); 1657 if (*gs6) 1658 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1659 #else 1660 *gs6 = NULL; 1661 #endif 1662 synchronize_net(); 1663 } 1664 1665 /* Resumes the geneve device data path for both TX and RX. */ 1666 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1667 struct geneve_sock __maybe_unused *gs6) 1668 { 1669 rcu_assign_pointer(geneve->sock4, gs4); 1670 if (gs4) 1671 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1672 #if IS_ENABLED(CONFIG_IPV6) 1673 rcu_assign_pointer(geneve->sock6, gs6); 1674 if (gs6) 1675 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1676 #endif 1677 synchronize_net(); 1678 } 1679 1680 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1681 struct nlattr *data[], 1682 struct netlink_ext_ack *extack) 1683 { 1684 struct geneve_dev *geneve = netdev_priv(dev); 1685 struct geneve_sock *gs4, *gs6; 1686 struct geneve_config cfg; 1687 int err; 1688 1689 /* If the geneve device is configured for metadata (or externally 1690 * controlled, for example, OVS), then nothing can be changed. 1691 */ 1692 if (geneve->cfg.collect_md) 1693 return -EOPNOTSUPP; 1694 1695 /* Start with the existing info. */ 1696 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1697 err = geneve_nl2info(tb, data, extack, &cfg, true); 1698 if (err) 1699 return err; 1700 1701 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1702 dst_cache_reset(&cfg.info.dst_cache); 1703 geneve_link_config(dev, &cfg.info, tb); 1704 } 1705 1706 geneve_quiesce(geneve, &gs4, &gs6); 1707 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1708 geneve_unquiesce(geneve, gs4, gs6); 1709 1710 return 0; 1711 } 1712 1713 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1714 { 1715 struct geneve_dev *geneve = netdev_priv(dev); 1716 1717 list_del(&geneve->next); 1718 unregister_netdevice_queue(dev, head); 1719 } 1720 1721 static size_t geneve_get_size(const struct net_device *dev) 1722 { 1723 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1724 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1725 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1726 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1727 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1728 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1729 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1730 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1731 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1732 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1733 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1734 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1735 0; 1736 } 1737 1738 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1739 { 1740 struct geneve_dev *geneve = netdev_priv(dev); 1741 struct ip_tunnel_info *info = &geneve->cfg.info; 1742 bool ttl_inherit = geneve->cfg.ttl_inherit; 1743 bool metadata = geneve->cfg.collect_md; 1744 __u8 tmp_vni[3]; 1745 __u32 vni; 1746 1747 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1748 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1749 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1750 goto nla_put_failure; 1751 1752 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1753 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1754 info->key.u.ipv4.dst)) 1755 goto nla_put_failure; 1756 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1757 !!(info->key.tun_flags & TUNNEL_CSUM))) 1758 goto nla_put_failure; 1759 1760 #if IS_ENABLED(CONFIG_IPV6) 1761 } else if (!metadata) { 1762 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1763 &info->key.u.ipv6.dst)) 1764 goto nla_put_failure; 1765 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1766 !(info->key.tun_flags & TUNNEL_CSUM))) 1767 goto nla_put_failure; 1768 #endif 1769 } 1770 1771 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1772 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1773 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1774 goto nla_put_failure; 1775 1776 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1777 goto nla_put_failure; 1778 1779 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1780 goto nla_put_failure; 1781 1782 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1783 goto nla_put_failure; 1784 1785 #if IS_ENABLED(CONFIG_IPV6) 1786 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1787 !geneve->cfg.use_udp6_rx_checksums)) 1788 goto nla_put_failure; 1789 #endif 1790 1791 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1792 goto nla_put_failure; 1793 1794 return 0; 1795 1796 nla_put_failure: 1797 return -EMSGSIZE; 1798 } 1799 1800 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1801 .kind = "geneve", 1802 .maxtype = IFLA_GENEVE_MAX, 1803 .policy = geneve_policy, 1804 .priv_size = sizeof(struct geneve_dev), 1805 .setup = geneve_setup, 1806 .validate = geneve_validate, 1807 .newlink = geneve_newlink, 1808 .changelink = geneve_changelink, 1809 .dellink = geneve_dellink, 1810 .get_size = geneve_get_size, 1811 .fill_info = geneve_fill_info, 1812 }; 1813 1814 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1815 u8 name_assign_type, u16 dst_port) 1816 { 1817 struct nlattr *tb[IFLA_MAX + 1]; 1818 struct net_device *dev; 1819 LIST_HEAD(list_kill); 1820 int err; 1821 struct geneve_config cfg = { 1822 .df = GENEVE_DF_UNSET, 1823 .use_udp6_rx_checksums = true, 1824 .ttl_inherit = false, 1825 .collect_md = true, 1826 }; 1827 1828 memset(tb, 0, sizeof(tb)); 1829 dev = rtnl_create_link(net, name, name_assign_type, 1830 &geneve_link_ops, tb, NULL); 1831 if (IS_ERR(dev)) 1832 return dev; 1833 1834 init_tnl_info(&cfg.info, dst_port); 1835 err = geneve_configure(net, dev, NULL, &cfg); 1836 if (err) { 1837 free_netdev(dev); 1838 return ERR_PTR(err); 1839 } 1840 1841 /* openvswitch users expect packet sizes to be unrestricted, 1842 * so set the largest MTU we can. 1843 */ 1844 err = geneve_change_mtu(dev, IP_MAX_MTU); 1845 if (err) 1846 goto err; 1847 1848 err = rtnl_configure_link(dev, NULL); 1849 if (err < 0) 1850 goto err; 1851 1852 return dev; 1853 err: 1854 geneve_dellink(dev, &list_kill); 1855 unregister_netdevice_many(&list_kill); 1856 return ERR_PTR(err); 1857 } 1858 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1859 1860 static int geneve_netdevice_event(struct notifier_block *unused, 1861 unsigned long event, void *ptr) 1862 { 1863 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1864 1865 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO || 1866 event == NETDEV_UDP_TUNNEL_DROP_INFO) { 1867 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO); 1868 } else if (event == NETDEV_UNREGISTER) { 1869 if (!dev->udp_tunnel_nic_info) 1870 geneve_offload_rx_ports(dev, false); 1871 } else if (event == NETDEV_REGISTER) { 1872 if (!dev->udp_tunnel_nic_info) 1873 geneve_offload_rx_ports(dev, true); 1874 } 1875 1876 return NOTIFY_DONE; 1877 } 1878 1879 static struct notifier_block geneve_notifier_block __read_mostly = { 1880 .notifier_call = geneve_netdevice_event, 1881 }; 1882 1883 static __net_init int geneve_init_net(struct net *net) 1884 { 1885 struct geneve_net *gn = net_generic(net, geneve_net_id); 1886 1887 INIT_LIST_HEAD(&gn->geneve_list); 1888 INIT_LIST_HEAD(&gn->sock_list); 1889 return 0; 1890 } 1891 1892 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1893 { 1894 struct geneve_net *gn = net_generic(net, geneve_net_id); 1895 struct geneve_dev *geneve, *next; 1896 struct net_device *dev, *aux; 1897 1898 /* gather any geneve devices that were moved into this ns */ 1899 for_each_netdev_safe(net, dev, aux) 1900 if (dev->rtnl_link_ops == &geneve_link_ops) 1901 unregister_netdevice_queue(dev, head); 1902 1903 /* now gather any other geneve devices that were created in this ns */ 1904 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1905 /* If geneve->dev is in the same netns, it was already added 1906 * to the list by the previous loop. 1907 */ 1908 if (!net_eq(dev_net(geneve->dev), net)) 1909 unregister_netdevice_queue(geneve->dev, head); 1910 } 1911 } 1912 1913 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1914 { 1915 struct net *net; 1916 LIST_HEAD(list); 1917 1918 rtnl_lock(); 1919 list_for_each_entry(net, net_list, exit_list) 1920 geneve_destroy_tunnels(net, &list); 1921 1922 /* unregister the devices gathered above */ 1923 unregister_netdevice_many(&list); 1924 rtnl_unlock(); 1925 1926 list_for_each_entry(net, net_list, exit_list) { 1927 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1928 1929 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1930 } 1931 } 1932 1933 static struct pernet_operations geneve_net_ops = { 1934 .init = geneve_init_net, 1935 .exit_batch = geneve_exit_batch_net, 1936 .id = &geneve_net_id, 1937 .size = sizeof(struct geneve_net), 1938 }; 1939 1940 static int __init geneve_init_module(void) 1941 { 1942 int rc; 1943 1944 rc = register_pernet_subsys(&geneve_net_ops); 1945 if (rc) 1946 goto out1; 1947 1948 rc = register_netdevice_notifier(&geneve_notifier_block); 1949 if (rc) 1950 goto out2; 1951 1952 rc = rtnl_link_register(&geneve_link_ops); 1953 if (rc) 1954 goto out3; 1955 1956 return 0; 1957 out3: 1958 unregister_netdevice_notifier(&geneve_notifier_block); 1959 out2: 1960 unregister_pernet_subsys(&geneve_net_ops); 1961 out1: 1962 return rc; 1963 } 1964 late_initcall(geneve_init_module); 1965 1966 static void __exit geneve_cleanup_module(void) 1967 { 1968 rtnl_link_unregister(&geneve_link_ops); 1969 unregister_netdevice_notifier(&geneve_notifier_block); 1970 unregister_pernet_subsys(&geneve_net_ops); 1971 } 1972 module_exit(geneve_cleanup_module); 1973 1974 MODULE_LICENSE("GPL"); 1975 MODULE_VERSION(GENEVE_NETDEV_VER); 1976 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1977 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1978 MODULE_ALIAS_RTNL_LINK("geneve"); 1979