1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * GENEVE: Generic Network Virtualization Encapsulation 4 * 5 * Copyright (c) 2015 Red Hat, Inc. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/ethtool.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/etherdevice.h> 14 #include <linux/hash.h> 15 #include <net/ipv6_stubs.h> 16 #include <net/dst_metadata.h> 17 #include <net/gro_cells.h> 18 #include <net/rtnetlink.h> 19 #include <net/geneve.h> 20 #include <net/protocol.h> 21 22 #define GENEVE_NETDEV_VER "0.6" 23 24 #define GENEVE_N_VID (1u << 24) 25 #define GENEVE_VID_MASK (GENEVE_N_VID - 1) 26 27 #define VNI_HASH_BITS 10 28 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 29 30 static bool log_ecn_error = true; 31 module_param(log_ecn_error, bool, 0644); 32 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 33 34 #define GENEVE_VER 0 35 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) 36 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN) 37 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN) 38 39 /* per-network namespace private data for this module */ 40 struct geneve_net { 41 struct list_head geneve_list; 42 struct list_head sock_list; 43 }; 44 45 static unsigned int geneve_net_id; 46 47 struct geneve_dev_node { 48 struct hlist_node hlist; 49 struct geneve_dev *geneve; 50 }; 51 52 struct geneve_config { 53 struct ip_tunnel_info info; 54 bool collect_md; 55 bool use_udp6_rx_checksums; 56 bool ttl_inherit; 57 enum ifla_geneve_df df; 58 }; 59 60 /* Pseudo network device */ 61 struct geneve_dev { 62 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ 63 #if IS_ENABLED(CONFIG_IPV6) 64 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ 65 #endif 66 struct net *net; /* netns for packet i/o */ 67 struct net_device *dev; /* netdev for geneve tunnel */ 68 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 69 #if IS_ENABLED(CONFIG_IPV6) 70 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ 71 #endif 72 struct list_head next; /* geneve's per namespace list */ 73 struct gro_cells gro_cells; 74 struct geneve_config cfg; 75 }; 76 77 struct geneve_sock { 78 bool collect_md; 79 struct list_head list; 80 struct socket *sock; 81 struct rcu_head rcu; 82 int refcnt; 83 struct hlist_head vni_list[VNI_HASH_SIZE]; 84 }; 85 86 static inline __u32 geneve_net_vni_hash(u8 vni[3]) 87 { 88 __u32 vnid; 89 90 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 91 return hash_32(vnid, VNI_HASH_BITS); 92 } 93 94 static __be64 vni_to_tunnel_id(const __u8 *vni) 95 { 96 #ifdef __BIG_ENDIAN 97 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 98 #else 99 return (__force __be64)(((__force u64)vni[0] << 40) | 100 ((__force u64)vni[1] << 48) | 101 ((__force u64)vni[2] << 56)); 102 #endif 103 } 104 105 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 106 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 107 { 108 #ifdef __BIG_ENDIAN 109 vni[0] = (__force __u8)(tun_id >> 16); 110 vni[1] = (__force __u8)(tun_id >> 8); 111 vni[2] = (__force __u8)tun_id; 112 #else 113 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 114 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 115 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 116 #endif 117 } 118 119 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) 120 { 121 return !memcmp(vni, &tun_id[5], 3); 122 } 123 124 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 125 { 126 return gs->sock->sk->sk_family; 127 } 128 129 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 130 __be32 addr, u8 vni[]) 131 { 132 struct hlist_head *vni_list_head; 133 struct geneve_dev_node *node; 134 __u32 hash; 135 136 /* Find the device for this VNI */ 137 hash = geneve_net_vni_hash(vni); 138 vni_list_head = &gs->vni_list[hash]; 139 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 140 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 141 addr == node->geneve->cfg.info.key.u.ipv4.dst) 142 return node->geneve; 143 } 144 return NULL; 145 } 146 147 #if IS_ENABLED(CONFIG_IPV6) 148 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 149 struct in6_addr addr6, u8 vni[]) 150 { 151 struct hlist_head *vni_list_head; 152 struct geneve_dev_node *node; 153 __u32 hash; 154 155 /* Find the device for this VNI */ 156 hash = geneve_net_vni_hash(vni); 157 vni_list_head = &gs->vni_list[hash]; 158 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 159 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 160 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst)) 161 return node->geneve; 162 } 163 return NULL; 164 } 165 #endif 166 167 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 168 { 169 return (struct genevehdr *)(udp_hdr(skb) + 1); 170 } 171 172 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 173 struct sk_buff *skb) 174 { 175 static u8 zero_vni[3]; 176 u8 *vni; 177 178 if (geneve_get_sk_family(gs) == AF_INET) { 179 struct iphdr *iph; 180 __be32 addr; 181 182 iph = ip_hdr(skb); /* outer IP header... */ 183 184 if (gs->collect_md) { 185 vni = zero_vni; 186 addr = 0; 187 } else { 188 vni = geneve_hdr(skb)->vni; 189 addr = iph->saddr; 190 } 191 192 return geneve_lookup(gs, addr, vni); 193 #if IS_ENABLED(CONFIG_IPV6) 194 } else if (geneve_get_sk_family(gs) == AF_INET6) { 195 static struct in6_addr zero_addr6; 196 struct ipv6hdr *ip6h; 197 struct in6_addr addr6; 198 199 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 200 201 if (gs->collect_md) { 202 vni = zero_vni; 203 addr6 = zero_addr6; 204 } else { 205 vni = geneve_hdr(skb)->vni; 206 addr6 = ip6h->saddr; 207 } 208 209 return geneve6_lookup(gs, addr6, vni); 210 #endif 211 } 212 return NULL; 213 } 214 215 /* geneve receive/decap routine */ 216 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 217 struct sk_buff *skb) 218 { 219 struct genevehdr *gnvh = geneve_hdr(skb); 220 struct metadata_dst *tun_dst = NULL; 221 unsigned int len; 222 int err = 0; 223 void *oiph; 224 225 if (ip_tunnel_collect_metadata() || gs->collect_md) { 226 __be16 flags; 227 228 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) | 229 (gnvh->critical ? TUNNEL_CRIT_OPT : 0); 230 231 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 232 vni_to_tunnel_id(gnvh->vni), 233 gnvh->opt_len * 4); 234 if (!tun_dst) { 235 geneve->dev->stats.rx_dropped++; 236 goto drop; 237 } 238 /* Update tunnel dst according to Geneve options. */ 239 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 240 gnvh->options, gnvh->opt_len * 4, 241 TUNNEL_GENEVE_OPT); 242 } else { 243 /* Drop packets w/ critical options, 244 * since we don't support any... 245 */ 246 if (gnvh->critical) { 247 geneve->dev->stats.rx_frame_errors++; 248 geneve->dev->stats.rx_errors++; 249 goto drop; 250 } 251 } 252 253 skb_reset_mac_header(skb); 254 skb->protocol = eth_type_trans(skb, geneve->dev); 255 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 256 257 if (tun_dst) 258 skb_dst_set(skb, &tun_dst->dst); 259 260 /* Ignore packet loops (and multicast echo) */ 261 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) { 262 geneve->dev->stats.rx_errors++; 263 goto drop; 264 } 265 266 oiph = skb_network_header(skb); 267 skb_reset_network_header(skb); 268 269 if (geneve_get_sk_family(gs) == AF_INET) 270 err = IP_ECN_decapsulate(oiph, skb); 271 #if IS_ENABLED(CONFIG_IPV6) 272 else 273 err = IP6_ECN_decapsulate(oiph, skb); 274 #endif 275 276 if (unlikely(err)) { 277 if (log_ecn_error) { 278 if (geneve_get_sk_family(gs) == AF_INET) 279 net_info_ratelimited("non-ECT from %pI4 " 280 "with TOS=%#x\n", 281 &((struct iphdr *)oiph)->saddr, 282 ((struct iphdr *)oiph)->tos); 283 #if IS_ENABLED(CONFIG_IPV6) 284 else 285 net_info_ratelimited("non-ECT from %pI6\n", 286 &((struct ipv6hdr *)oiph)->saddr); 287 #endif 288 } 289 if (err > 1) { 290 ++geneve->dev->stats.rx_frame_errors; 291 ++geneve->dev->stats.rx_errors; 292 goto drop; 293 } 294 } 295 296 len = skb->len; 297 err = gro_cells_receive(&geneve->gro_cells, skb); 298 if (likely(err == NET_RX_SUCCESS)) 299 dev_sw_netstats_rx_add(geneve->dev, len); 300 301 return; 302 drop: 303 /* Consume bad packet */ 304 kfree_skb(skb); 305 } 306 307 /* Setup stats when device is created */ 308 static int geneve_init(struct net_device *dev) 309 { 310 struct geneve_dev *geneve = netdev_priv(dev); 311 int err; 312 313 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 314 if (!dev->tstats) 315 return -ENOMEM; 316 317 err = gro_cells_init(&geneve->gro_cells, dev); 318 if (err) { 319 free_percpu(dev->tstats); 320 return err; 321 } 322 323 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 324 if (err) { 325 free_percpu(dev->tstats); 326 gro_cells_destroy(&geneve->gro_cells); 327 return err; 328 } 329 return 0; 330 } 331 332 static void geneve_uninit(struct net_device *dev) 333 { 334 struct geneve_dev *geneve = netdev_priv(dev); 335 336 dst_cache_destroy(&geneve->cfg.info.dst_cache); 337 gro_cells_destroy(&geneve->gro_cells); 338 free_percpu(dev->tstats); 339 } 340 341 /* Callback from net/ipv4/udp.c to receive packets */ 342 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 343 { 344 struct genevehdr *geneveh; 345 struct geneve_dev *geneve; 346 struct geneve_sock *gs; 347 int opts_len; 348 349 /* Need UDP and Geneve header to be present */ 350 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 351 goto drop; 352 353 /* Return packets with reserved bits set */ 354 geneveh = geneve_hdr(skb); 355 if (unlikely(geneveh->ver != GENEVE_VER)) 356 goto drop; 357 358 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) 359 goto drop; 360 361 gs = rcu_dereference_sk_user_data(sk); 362 if (!gs) 363 goto drop; 364 365 geneve = geneve_lookup_skb(gs, skb); 366 if (!geneve) 367 goto drop; 368 369 opts_len = geneveh->opt_len * 4; 370 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, 371 htons(ETH_P_TEB), 372 !net_eq(geneve->net, dev_net(geneve->dev)))) { 373 geneve->dev->stats.rx_dropped++; 374 goto drop; 375 } 376 377 geneve_rx(geneve, gs, skb); 378 return 0; 379 380 drop: 381 /* Consume bad packet */ 382 kfree_skb(skb); 383 return 0; 384 } 385 386 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 387 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 388 { 389 struct genevehdr *geneveh; 390 struct geneve_sock *gs; 391 u8 zero_vni[3] = { 0 }; 392 u8 *vni = zero_vni; 393 394 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 395 return -EINVAL; 396 397 geneveh = geneve_hdr(skb); 398 if (geneveh->ver != GENEVE_VER) 399 return -EINVAL; 400 401 if (geneveh->proto_type != htons(ETH_P_TEB)) 402 return -EINVAL; 403 404 gs = rcu_dereference_sk_user_data(sk); 405 if (!gs) 406 return -ENOENT; 407 408 if (geneve_get_sk_family(gs) == AF_INET) { 409 struct iphdr *iph = ip_hdr(skb); 410 __be32 addr4 = 0; 411 412 if (!gs->collect_md) { 413 vni = geneve_hdr(skb)->vni; 414 addr4 = iph->daddr; 415 } 416 417 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 418 } 419 420 #if IS_ENABLED(CONFIG_IPV6) 421 if (geneve_get_sk_family(gs) == AF_INET6) { 422 struct ipv6hdr *ip6h = ipv6_hdr(skb); 423 struct in6_addr addr6; 424 425 memset(&addr6, 0, sizeof(struct in6_addr)); 426 427 if (!gs->collect_md) { 428 vni = geneve_hdr(skb)->vni; 429 addr6 = ip6h->daddr; 430 } 431 432 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 433 } 434 #endif 435 436 return -EPFNOSUPPORT; 437 } 438 439 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 440 __be16 port, bool ipv6_rx_csum) 441 { 442 struct socket *sock; 443 struct udp_port_cfg udp_conf; 444 int err; 445 446 memset(&udp_conf, 0, sizeof(udp_conf)); 447 448 if (ipv6) { 449 udp_conf.family = AF_INET6; 450 udp_conf.ipv6_v6only = 1; 451 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 452 } else { 453 udp_conf.family = AF_INET; 454 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 455 } 456 457 udp_conf.local_udp_port = port; 458 459 /* Open UDP socket */ 460 err = udp_sock_create(net, &udp_conf, &sock); 461 if (err < 0) 462 return ERR_PTR(err); 463 464 udp_allow_gso(sock->sk); 465 return sock; 466 } 467 468 static int geneve_hlen(struct genevehdr *gh) 469 { 470 return sizeof(*gh) + gh->opt_len * 4; 471 } 472 473 static struct sk_buff *geneve_gro_receive(struct sock *sk, 474 struct list_head *head, 475 struct sk_buff *skb) 476 { 477 struct sk_buff *pp = NULL; 478 struct sk_buff *p; 479 struct genevehdr *gh, *gh2; 480 unsigned int hlen, gh_len, off_gnv; 481 const struct packet_offload *ptype; 482 __be16 type; 483 int flush = 1; 484 485 off_gnv = skb_gro_offset(skb); 486 hlen = off_gnv + sizeof(*gh); 487 gh = skb_gro_header_fast(skb, off_gnv); 488 if (skb_gro_header_hard(skb, hlen)) { 489 gh = skb_gro_header_slow(skb, hlen, off_gnv); 490 if (unlikely(!gh)) 491 goto out; 492 } 493 494 if (gh->ver != GENEVE_VER || gh->oam) 495 goto out; 496 gh_len = geneve_hlen(gh); 497 498 hlen = off_gnv + gh_len; 499 if (skb_gro_header_hard(skb, hlen)) { 500 gh = skb_gro_header_slow(skb, hlen, off_gnv); 501 if (unlikely(!gh)) 502 goto out; 503 } 504 505 list_for_each_entry(p, head, list) { 506 if (!NAPI_GRO_CB(p)->same_flow) 507 continue; 508 509 gh2 = (struct genevehdr *)(p->data + off_gnv); 510 if (gh->opt_len != gh2->opt_len || 511 memcmp(gh, gh2, gh_len)) { 512 NAPI_GRO_CB(p)->same_flow = 0; 513 continue; 514 } 515 } 516 517 type = gh->proto_type; 518 519 rcu_read_lock(); 520 ptype = gro_find_receive_by_type(type); 521 if (!ptype) 522 goto out_unlock; 523 524 skb_gro_pull(skb, gh_len); 525 skb_gro_postpull_rcsum(skb, gh, gh_len); 526 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 527 flush = 0; 528 529 out_unlock: 530 rcu_read_unlock(); 531 out: 532 skb_gro_flush_final(skb, pp, flush); 533 534 return pp; 535 } 536 537 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 538 int nhoff) 539 { 540 struct genevehdr *gh; 541 struct packet_offload *ptype; 542 __be16 type; 543 int gh_len; 544 int err = -ENOSYS; 545 546 gh = (struct genevehdr *)(skb->data + nhoff); 547 gh_len = geneve_hlen(gh); 548 type = gh->proto_type; 549 550 rcu_read_lock(); 551 ptype = gro_find_complete_by_type(type); 552 if (ptype) 553 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 554 555 rcu_read_unlock(); 556 557 skb_set_inner_mac_header(skb, nhoff + gh_len); 558 559 return err; 560 } 561 562 /* Create new listen socket if needed */ 563 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 564 bool ipv6, bool ipv6_rx_csum) 565 { 566 struct geneve_net *gn = net_generic(net, geneve_net_id); 567 struct geneve_sock *gs; 568 struct socket *sock; 569 struct udp_tunnel_sock_cfg tunnel_cfg; 570 int h; 571 572 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 573 if (!gs) 574 return ERR_PTR(-ENOMEM); 575 576 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 577 if (IS_ERR(sock)) { 578 kfree(gs); 579 return ERR_CAST(sock); 580 } 581 582 gs->sock = sock; 583 gs->refcnt = 1; 584 for (h = 0; h < VNI_HASH_SIZE; ++h) 585 INIT_HLIST_HEAD(&gs->vni_list[h]); 586 587 /* Initialize the geneve udp offloads structure */ 588 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 589 590 /* Mark socket as an encapsulation socket */ 591 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 592 tunnel_cfg.sk_user_data = gs; 593 tunnel_cfg.encap_type = 1; 594 tunnel_cfg.gro_receive = geneve_gro_receive; 595 tunnel_cfg.gro_complete = geneve_gro_complete; 596 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 597 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 598 tunnel_cfg.encap_destroy = NULL; 599 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 600 list_add(&gs->list, &gn->sock_list); 601 return gs; 602 } 603 604 static void __geneve_sock_release(struct geneve_sock *gs) 605 { 606 if (!gs || --gs->refcnt) 607 return; 608 609 list_del(&gs->list); 610 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 611 udp_tunnel_sock_release(gs->sock); 612 kfree_rcu(gs, rcu); 613 } 614 615 static void geneve_sock_release(struct geneve_dev *geneve) 616 { 617 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 618 #if IS_ENABLED(CONFIG_IPV6) 619 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 620 621 rcu_assign_pointer(geneve->sock6, NULL); 622 #endif 623 624 rcu_assign_pointer(geneve->sock4, NULL); 625 synchronize_net(); 626 627 __geneve_sock_release(gs4); 628 #if IS_ENABLED(CONFIG_IPV6) 629 __geneve_sock_release(gs6); 630 #endif 631 } 632 633 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 634 sa_family_t family, 635 __be16 dst_port) 636 { 637 struct geneve_sock *gs; 638 639 list_for_each_entry(gs, &gn->sock_list, list) { 640 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 641 geneve_get_sk_family(gs) == family) { 642 return gs; 643 } 644 } 645 return NULL; 646 } 647 648 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 649 { 650 struct net *net = geneve->net; 651 struct geneve_net *gn = net_generic(net, geneve_net_id); 652 struct geneve_dev_node *node; 653 struct geneve_sock *gs; 654 __u8 vni[3]; 655 __u32 hash; 656 657 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 658 if (gs) { 659 gs->refcnt++; 660 goto out; 661 } 662 663 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 664 geneve->cfg.use_udp6_rx_checksums); 665 if (IS_ERR(gs)) 666 return PTR_ERR(gs); 667 668 out: 669 gs->collect_md = geneve->cfg.collect_md; 670 #if IS_ENABLED(CONFIG_IPV6) 671 if (ipv6) { 672 rcu_assign_pointer(geneve->sock6, gs); 673 node = &geneve->hlist6; 674 } else 675 #endif 676 { 677 rcu_assign_pointer(geneve->sock4, gs); 678 node = &geneve->hlist4; 679 } 680 node->geneve = geneve; 681 682 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 683 hash = geneve_net_vni_hash(vni); 684 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 685 return 0; 686 } 687 688 static int geneve_open(struct net_device *dev) 689 { 690 struct geneve_dev *geneve = netdev_priv(dev); 691 bool metadata = geneve->cfg.collect_md; 692 bool ipv4, ipv6; 693 int ret = 0; 694 695 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 696 ipv4 = !ipv6 || metadata; 697 #if IS_ENABLED(CONFIG_IPV6) 698 if (ipv6) { 699 ret = geneve_sock_add(geneve, true); 700 if (ret < 0 && ret != -EAFNOSUPPORT) 701 ipv4 = false; 702 } 703 #endif 704 if (ipv4) 705 ret = geneve_sock_add(geneve, false); 706 if (ret < 0) 707 geneve_sock_release(geneve); 708 709 return ret; 710 } 711 712 static int geneve_stop(struct net_device *dev) 713 { 714 struct geneve_dev *geneve = netdev_priv(dev); 715 716 hlist_del_init_rcu(&geneve->hlist4.hlist); 717 #if IS_ENABLED(CONFIG_IPV6) 718 hlist_del_init_rcu(&geneve->hlist6.hlist); 719 #endif 720 geneve_sock_release(geneve); 721 return 0; 722 } 723 724 static void geneve_build_header(struct genevehdr *geneveh, 725 const struct ip_tunnel_info *info) 726 { 727 geneveh->ver = GENEVE_VER; 728 geneveh->opt_len = info->options_len / 4; 729 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 730 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 731 geneveh->rsvd1 = 0; 732 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 733 geneveh->proto_type = htons(ETH_P_TEB); 734 geneveh->rsvd2 = 0; 735 736 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 737 ip_tunnel_info_opts_get(geneveh->options, info); 738 } 739 740 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 741 const struct ip_tunnel_info *info, 742 bool xnet, int ip_hdr_len) 743 { 744 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 745 struct genevehdr *gnvh; 746 int min_headroom; 747 int err; 748 749 skb_reset_mac_header(skb); 750 skb_scrub_packet(skb, xnet); 751 752 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 753 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 754 err = skb_cow_head(skb, min_headroom); 755 if (unlikely(err)) 756 goto free_dst; 757 758 err = udp_tunnel_handle_offloads(skb, udp_sum); 759 if (err) 760 goto free_dst; 761 762 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 763 geneve_build_header(gnvh, info); 764 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 765 return 0; 766 767 free_dst: 768 dst_release(dst); 769 return err; 770 } 771 772 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 773 struct net_device *dev, 774 struct geneve_sock *gs4, 775 struct flowi4 *fl4, 776 const struct ip_tunnel_info *info, 777 __be16 dport, __be16 sport) 778 { 779 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 780 struct geneve_dev *geneve = netdev_priv(dev); 781 struct dst_cache *dst_cache; 782 struct rtable *rt = NULL; 783 __u8 tos; 784 785 if (!gs4) 786 return ERR_PTR(-EIO); 787 788 memset(fl4, 0, sizeof(*fl4)); 789 fl4->flowi4_mark = skb->mark; 790 fl4->flowi4_proto = IPPROTO_UDP; 791 fl4->daddr = info->key.u.ipv4.dst; 792 fl4->saddr = info->key.u.ipv4.src; 793 fl4->fl4_dport = dport; 794 fl4->fl4_sport = sport; 795 796 tos = info->key.tos; 797 if ((tos == 1) && !geneve->cfg.collect_md) { 798 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 799 use_cache = false; 800 } 801 fl4->flowi4_tos = RT_TOS(tos); 802 803 dst_cache = (struct dst_cache *)&info->dst_cache; 804 if (use_cache) { 805 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 806 if (rt) 807 return rt; 808 } 809 rt = ip_route_output_key(geneve->net, fl4); 810 if (IS_ERR(rt)) { 811 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 812 return ERR_PTR(-ENETUNREACH); 813 } 814 if (rt->dst.dev == dev) { /* is this necessary? */ 815 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 816 ip_rt_put(rt); 817 return ERR_PTR(-ELOOP); 818 } 819 if (use_cache) 820 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 821 return rt; 822 } 823 824 #if IS_ENABLED(CONFIG_IPV6) 825 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 826 struct net_device *dev, 827 struct geneve_sock *gs6, 828 struct flowi6 *fl6, 829 const struct ip_tunnel_info *info, 830 __be16 dport, __be16 sport) 831 { 832 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 833 struct geneve_dev *geneve = netdev_priv(dev); 834 struct dst_entry *dst = NULL; 835 struct dst_cache *dst_cache; 836 __u8 prio; 837 838 if (!gs6) 839 return ERR_PTR(-EIO); 840 841 memset(fl6, 0, sizeof(*fl6)); 842 fl6->flowi6_mark = skb->mark; 843 fl6->flowi6_proto = IPPROTO_UDP; 844 fl6->daddr = info->key.u.ipv6.dst; 845 fl6->saddr = info->key.u.ipv6.src; 846 fl6->fl6_dport = dport; 847 fl6->fl6_sport = sport; 848 849 prio = info->key.tos; 850 if ((prio == 1) && !geneve->cfg.collect_md) { 851 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 852 use_cache = false; 853 } 854 855 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 856 info->key.label); 857 dst_cache = (struct dst_cache *)&info->dst_cache; 858 if (use_cache) { 859 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 860 if (dst) 861 return dst; 862 } 863 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, 864 NULL); 865 if (IS_ERR(dst)) { 866 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 867 return ERR_PTR(-ENETUNREACH); 868 } 869 if (dst->dev == dev) { /* is this necessary? */ 870 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 871 dst_release(dst); 872 return ERR_PTR(-ELOOP); 873 } 874 875 if (use_cache) 876 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 877 return dst; 878 } 879 #endif 880 881 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 882 struct geneve_dev *geneve, 883 const struct ip_tunnel_info *info) 884 { 885 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 886 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 887 const struct ip_tunnel_key *key = &info->key; 888 struct rtable *rt; 889 struct flowi4 fl4; 890 __u8 tos, ttl; 891 __be16 df = 0; 892 __be16 sport; 893 int err; 894 895 if (!pskb_inet_may_pull(skb)) 896 return -EINVAL; 897 898 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 899 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 900 geneve->cfg.info.key.tp_dst, sport); 901 if (IS_ERR(rt)) 902 return PTR_ERR(rt); 903 904 err = skb_tunnel_check_pmtu(skb, &rt->dst, 905 GENEVE_IPV4_HLEN + info->options_len, 906 netif_is_any_bridge_port(dev)); 907 if (err < 0) { 908 dst_release(&rt->dst); 909 return err; 910 } else if (err) { 911 struct ip_tunnel_info *info; 912 913 info = skb_tunnel_info(skb); 914 if (info) { 915 struct ip_tunnel_info *unclone; 916 917 unclone = skb_tunnel_info_unclone(skb); 918 if (unlikely(!unclone)) { 919 dst_release(&rt->dst); 920 return -ENOMEM; 921 } 922 923 unclone->key.u.ipv4.dst = fl4.saddr; 924 unclone->key.u.ipv4.src = fl4.daddr; 925 } 926 927 if (!pskb_may_pull(skb, ETH_HLEN)) { 928 dst_release(&rt->dst); 929 return -EINVAL; 930 } 931 932 skb->protocol = eth_type_trans(skb, geneve->dev); 933 netif_rx(skb); 934 dst_release(&rt->dst); 935 return -EMSGSIZE; 936 } 937 938 if (geneve->cfg.collect_md) { 939 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 940 ttl = key->ttl; 941 942 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 943 } else { 944 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); 945 if (geneve->cfg.ttl_inherit) 946 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 947 else 948 ttl = key->ttl; 949 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 950 951 if (geneve->cfg.df == GENEVE_DF_SET) { 952 df = htons(IP_DF); 953 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 954 struct ethhdr *eth = eth_hdr(skb); 955 956 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 957 df = htons(IP_DF); 958 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 959 struct iphdr *iph = ip_hdr(skb); 960 961 if (iph->frag_off & htons(IP_DF)) 962 df = htons(IP_DF); 963 } 964 } 965 } 966 967 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr)); 968 if (unlikely(err)) 969 return err; 970 971 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 972 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 973 !net_eq(geneve->net, dev_net(geneve->dev)), 974 !(info->key.tun_flags & TUNNEL_CSUM)); 975 return 0; 976 } 977 978 #if IS_ENABLED(CONFIG_IPV6) 979 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 980 struct geneve_dev *geneve, 981 const struct ip_tunnel_info *info) 982 { 983 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 984 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 985 const struct ip_tunnel_key *key = &info->key; 986 struct dst_entry *dst = NULL; 987 struct flowi6 fl6; 988 __u8 prio, ttl; 989 __be16 sport; 990 int err; 991 992 if (!pskb_inet_may_pull(skb)) 993 return -EINVAL; 994 995 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 996 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 997 geneve->cfg.info.key.tp_dst, sport); 998 if (IS_ERR(dst)) 999 return PTR_ERR(dst); 1000 1001 err = skb_tunnel_check_pmtu(skb, dst, 1002 GENEVE_IPV6_HLEN + info->options_len, 1003 netif_is_any_bridge_port(dev)); 1004 if (err < 0) { 1005 dst_release(dst); 1006 return err; 1007 } else if (err) { 1008 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1009 1010 if (info) { 1011 struct ip_tunnel_info *unclone; 1012 1013 unclone = skb_tunnel_info_unclone(skb); 1014 if (unlikely(!unclone)) { 1015 dst_release(dst); 1016 return -ENOMEM; 1017 } 1018 1019 unclone->key.u.ipv6.dst = fl6.saddr; 1020 unclone->key.u.ipv6.src = fl6.daddr; 1021 } 1022 1023 if (!pskb_may_pull(skb, ETH_HLEN)) { 1024 dst_release(dst); 1025 return -EINVAL; 1026 } 1027 1028 skb->protocol = eth_type_trans(skb, geneve->dev); 1029 netif_rx(skb); 1030 dst_release(dst); 1031 return -EMSGSIZE; 1032 } 1033 1034 if (geneve->cfg.collect_md) { 1035 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 1036 ttl = key->ttl; 1037 } else { 1038 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1039 ip_hdr(skb), skb); 1040 if (geneve->cfg.ttl_inherit) 1041 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1042 else 1043 ttl = key->ttl; 1044 ttl = ttl ? : ip6_dst_hoplimit(dst); 1045 } 1046 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr)); 1047 if (unlikely(err)) 1048 return err; 1049 1050 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1051 &fl6.saddr, &fl6.daddr, prio, ttl, 1052 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1053 !(info->key.tun_flags & TUNNEL_CSUM)); 1054 return 0; 1055 } 1056 #endif 1057 1058 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1059 { 1060 struct geneve_dev *geneve = netdev_priv(dev); 1061 struct ip_tunnel_info *info = NULL; 1062 int err; 1063 1064 if (geneve->cfg.collect_md) { 1065 info = skb_tunnel_info(skb); 1066 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1067 netdev_dbg(dev, "no tunnel metadata\n"); 1068 dev_kfree_skb(skb); 1069 dev->stats.tx_dropped++; 1070 return NETDEV_TX_OK; 1071 } 1072 } else { 1073 info = &geneve->cfg.info; 1074 } 1075 1076 rcu_read_lock(); 1077 #if IS_ENABLED(CONFIG_IPV6) 1078 if (info->mode & IP_TUNNEL_INFO_IPV6) 1079 err = geneve6_xmit_skb(skb, dev, geneve, info); 1080 else 1081 #endif 1082 err = geneve_xmit_skb(skb, dev, geneve, info); 1083 rcu_read_unlock(); 1084 1085 if (likely(!err)) 1086 return NETDEV_TX_OK; 1087 1088 if (err != -EMSGSIZE) 1089 dev_kfree_skb(skb); 1090 1091 if (err == -ELOOP) 1092 dev->stats.collisions++; 1093 else if (err == -ENETUNREACH) 1094 dev->stats.tx_carrier_errors++; 1095 1096 dev->stats.tx_errors++; 1097 return NETDEV_TX_OK; 1098 } 1099 1100 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1101 { 1102 if (new_mtu > dev->max_mtu) 1103 new_mtu = dev->max_mtu; 1104 else if (new_mtu < dev->min_mtu) 1105 new_mtu = dev->min_mtu; 1106 1107 dev->mtu = new_mtu; 1108 return 0; 1109 } 1110 1111 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1112 { 1113 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1114 struct geneve_dev *geneve = netdev_priv(dev); 1115 __be16 sport; 1116 1117 if (ip_tunnel_info_af(info) == AF_INET) { 1118 struct rtable *rt; 1119 struct flowi4 fl4; 1120 1121 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1122 sport = udp_flow_src_port(geneve->net, skb, 1123 1, USHRT_MAX, true); 1124 1125 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 1126 geneve->cfg.info.key.tp_dst, sport); 1127 if (IS_ERR(rt)) 1128 return PTR_ERR(rt); 1129 1130 ip_rt_put(rt); 1131 info->key.u.ipv4.src = fl4.saddr; 1132 #if IS_ENABLED(CONFIG_IPV6) 1133 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1134 struct dst_entry *dst; 1135 struct flowi6 fl6; 1136 1137 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1138 sport = udp_flow_src_port(geneve->net, skb, 1139 1, USHRT_MAX, true); 1140 1141 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1142 geneve->cfg.info.key.tp_dst, sport); 1143 if (IS_ERR(dst)) 1144 return PTR_ERR(dst); 1145 1146 dst_release(dst); 1147 info->key.u.ipv6.src = fl6.saddr; 1148 #endif 1149 } else { 1150 return -EINVAL; 1151 } 1152 1153 info->key.tp_src = sport; 1154 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1155 return 0; 1156 } 1157 1158 static const struct net_device_ops geneve_netdev_ops = { 1159 .ndo_init = geneve_init, 1160 .ndo_uninit = geneve_uninit, 1161 .ndo_open = geneve_open, 1162 .ndo_stop = geneve_stop, 1163 .ndo_start_xmit = geneve_xmit, 1164 .ndo_get_stats64 = dev_get_tstats64, 1165 .ndo_change_mtu = geneve_change_mtu, 1166 .ndo_validate_addr = eth_validate_addr, 1167 .ndo_set_mac_address = eth_mac_addr, 1168 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1169 }; 1170 1171 static void geneve_get_drvinfo(struct net_device *dev, 1172 struct ethtool_drvinfo *drvinfo) 1173 { 1174 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1175 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1176 } 1177 1178 static const struct ethtool_ops geneve_ethtool_ops = { 1179 .get_drvinfo = geneve_get_drvinfo, 1180 .get_link = ethtool_op_get_link, 1181 }; 1182 1183 /* Info for udev, that this is a virtual tunnel endpoint */ 1184 static struct device_type geneve_type = { 1185 .name = "geneve", 1186 }; 1187 1188 /* Calls the ndo_udp_tunnel_add of the caller in order to 1189 * supply the listening GENEVE udp ports. Callers are expected 1190 * to implement the ndo_udp_tunnel_add. 1191 */ 1192 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1193 { 1194 struct net *net = dev_net(dev); 1195 struct geneve_net *gn = net_generic(net, geneve_net_id); 1196 struct geneve_sock *gs; 1197 1198 rcu_read_lock(); 1199 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1200 if (push) { 1201 udp_tunnel_push_rx_port(dev, gs->sock, 1202 UDP_TUNNEL_TYPE_GENEVE); 1203 } else { 1204 udp_tunnel_drop_rx_port(dev, gs->sock, 1205 UDP_TUNNEL_TYPE_GENEVE); 1206 } 1207 } 1208 rcu_read_unlock(); 1209 } 1210 1211 /* Initialize the device structure. */ 1212 static void geneve_setup(struct net_device *dev) 1213 { 1214 ether_setup(dev); 1215 1216 dev->netdev_ops = &geneve_netdev_ops; 1217 dev->ethtool_ops = &geneve_ethtool_ops; 1218 dev->needs_free_netdev = true; 1219 1220 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1221 1222 dev->features |= NETIF_F_LLTX; 1223 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1224 dev->features |= NETIF_F_RXCSUM; 1225 dev->features |= NETIF_F_GSO_SOFTWARE; 1226 1227 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1228 dev->hw_features |= NETIF_F_RXCSUM; 1229 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1230 1231 /* MTU range: 68 - (something less than 65535) */ 1232 dev->min_mtu = ETH_MIN_MTU; 1233 /* The max_mtu calculation does not take account of GENEVE 1234 * options, to avoid excluding potentially valid 1235 * configurations. This will be further reduced by IPvX hdr size. 1236 */ 1237 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1238 1239 netif_keep_dst(dev); 1240 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1241 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1242 eth_hw_addr_random(dev); 1243 } 1244 1245 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1246 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1247 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1248 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1249 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1250 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1251 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1252 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1253 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1254 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1255 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1256 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1257 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1258 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1259 }; 1260 1261 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1262 struct netlink_ext_ack *extack) 1263 { 1264 if (tb[IFLA_ADDRESS]) { 1265 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1266 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1267 "Provided link layer address is not Ethernet"); 1268 return -EINVAL; 1269 } 1270 1271 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1272 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1273 "Provided Ethernet address is not unicast"); 1274 return -EADDRNOTAVAIL; 1275 } 1276 } 1277 1278 if (!data) { 1279 NL_SET_ERR_MSG(extack, 1280 "Not enough attributes provided to perform the operation"); 1281 return -EINVAL; 1282 } 1283 1284 if (data[IFLA_GENEVE_ID]) { 1285 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1286 1287 if (vni >= GENEVE_N_VID) { 1288 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1289 "Geneve ID must be lower than 16777216"); 1290 return -ERANGE; 1291 } 1292 } 1293 1294 if (data[IFLA_GENEVE_DF]) { 1295 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1296 1297 if (df < 0 || df > GENEVE_DF_MAX) { 1298 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1299 "Invalid DF attribute"); 1300 return -EINVAL; 1301 } 1302 } 1303 1304 return 0; 1305 } 1306 1307 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1308 const struct ip_tunnel_info *info, 1309 bool *tun_on_same_port, 1310 bool *tun_collect_md) 1311 { 1312 struct geneve_dev *geneve, *t = NULL; 1313 1314 *tun_on_same_port = false; 1315 *tun_collect_md = false; 1316 list_for_each_entry(geneve, &gn->geneve_list, next) { 1317 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1318 *tun_collect_md = geneve->cfg.collect_md; 1319 *tun_on_same_port = true; 1320 } 1321 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1322 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1323 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1324 t = geneve; 1325 } 1326 return t; 1327 } 1328 1329 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1330 { 1331 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1332 info->key.ttl || info->key.label || info->key.tp_src || 1333 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1334 } 1335 1336 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1337 struct ip_tunnel_info *b) 1338 { 1339 if (ip_tunnel_info_af(a) == AF_INET) 1340 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1341 else 1342 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1343 } 1344 1345 static int geneve_configure(struct net *net, struct net_device *dev, 1346 struct netlink_ext_ack *extack, 1347 const struct geneve_config *cfg) 1348 { 1349 struct geneve_net *gn = net_generic(net, geneve_net_id); 1350 struct geneve_dev *t, *geneve = netdev_priv(dev); 1351 const struct ip_tunnel_info *info = &cfg->info; 1352 bool tun_collect_md, tun_on_same_port; 1353 int err, encap_len; 1354 1355 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1356 NL_SET_ERR_MSG(extack, 1357 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1358 return -EINVAL; 1359 } 1360 1361 geneve->net = net; 1362 geneve->dev = dev; 1363 1364 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1365 if (t) 1366 return -EBUSY; 1367 1368 /* make enough headroom for basic scenario */ 1369 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1370 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1371 encap_len += sizeof(struct iphdr); 1372 dev->max_mtu -= sizeof(struct iphdr); 1373 } else { 1374 encap_len += sizeof(struct ipv6hdr); 1375 dev->max_mtu -= sizeof(struct ipv6hdr); 1376 } 1377 dev->needed_headroom = encap_len + ETH_HLEN; 1378 1379 if (cfg->collect_md) { 1380 if (tun_on_same_port) { 1381 NL_SET_ERR_MSG(extack, 1382 "There can be only one externally controlled device on a destination port"); 1383 return -EPERM; 1384 } 1385 } else { 1386 if (tun_collect_md) { 1387 NL_SET_ERR_MSG(extack, 1388 "There already exists an externally controlled device on this destination port"); 1389 return -EPERM; 1390 } 1391 } 1392 1393 dst_cache_reset(&geneve->cfg.info.dst_cache); 1394 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1395 1396 err = register_netdevice(dev); 1397 if (err) 1398 return err; 1399 1400 list_add(&geneve->next, &gn->geneve_list); 1401 return 0; 1402 } 1403 1404 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1405 { 1406 memset(info, 0, sizeof(*info)); 1407 info->key.tp_dst = htons(dst_port); 1408 } 1409 1410 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1411 struct netlink_ext_ack *extack, 1412 struct geneve_config *cfg, bool changelink) 1413 { 1414 struct ip_tunnel_info *info = &cfg->info; 1415 int attrtype; 1416 1417 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1418 NL_SET_ERR_MSG(extack, 1419 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1420 return -EINVAL; 1421 } 1422 1423 if (data[IFLA_GENEVE_REMOTE]) { 1424 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1425 attrtype = IFLA_GENEVE_REMOTE; 1426 goto change_notsup; 1427 } 1428 1429 info->key.u.ipv4.dst = 1430 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1431 1432 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1433 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1434 "Remote IPv4 address cannot be Multicast"); 1435 return -EINVAL; 1436 } 1437 } 1438 1439 if (data[IFLA_GENEVE_REMOTE6]) { 1440 #if IS_ENABLED(CONFIG_IPV6) 1441 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1442 attrtype = IFLA_GENEVE_REMOTE6; 1443 goto change_notsup; 1444 } 1445 1446 info->mode = IP_TUNNEL_INFO_IPV6; 1447 info->key.u.ipv6.dst = 1448 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1449 1450 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1451 IPV6_ADDR_LINKLOCAL) { 1452 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1453 "Remote IPv6 address cannot be link-local"); 1454 return -EINVAL; 1455 } 1456 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1457 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1458 "Remote IPv6 address cannot be Multicast"); 1459 return -EINVAL; 1460 } 1461 info->key.tun_flags |= TUNNEL_CSUM; 1462 cfg->use_udp6_rx_checksums = true; 1463 #else 1464 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1465 "IPv6 support not enabled in the kernel"); 1466 return -EPFNOSUPPORT; 1467 #endif 1468 } 1469 1470 if (data[IFLA_GENEVE_ID]) { 1471 __u32 vni; 1472 __u8 tvni[3]; 1473 __be64 tunid; 1474 1475 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1476 tvni[0] = (vni & 0x00ff0000) >> 16; 1477 tvni[1] = (vni & 0x0000ff00) >> 8; 1478 tvni[2] = vni & 0x000000ff; 1479 1480 tunid = vni_to_tunnel_id(tvni); 1481 if (changelink && (tunid != info->key.tun_id)) { 1482 attrtype = IFLA_GENEVE_ID; 1483 goto change_notsup; 1484 } 1485 info->key.tun_id = tunid; 1486 } 1487 1488 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1489 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1490 cfg->ttl_inherit = true; 1491 else 1492 cfg->ttl_inherit = false; 1493 } else if (data[IFLA_GENEVE_TTL]) { 1494 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1495 cfg->ttl_inherit = false; 1496 } 1497 1498 if (data[IFLA_GENEVE_TOS]) 1499 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1500 1501 if (data[IFLA_GENEVE_DF]) 1502 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1503 1504 if (data[IFLA_GENEVE_LABEL]) { 1505 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1506 IPV6_FLOWLABEL_MASK; 1507 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1508 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1509 "Label attribute only applies for IPv6 Geneve devices"); 1510 return -EINVAL; 1511 } 1512 } 1513 1514 if (data[IFLA_GENEVE_PORT]) { 1515 if (changelink) { 1516 attrtype = IFLA_GENEVE_PORT; 1517 goto change_notsup; 1518 } 1519 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1520 } 1521 1522 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1523 if (changelink) { 1524 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1525 goto change_notsup; 1526 } 1527 cfg->collect_md = true; 1528 } 1529 1530 if (data[IFLA_GENEVE_UDP_CSUM]) { 1531 if (changelink) { 1532 attrtype = IFLA_GENEVE_UDP_CSUM; 1533 goto change_notsup; 1534 } 1535 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1536 info->key.tun_flags |= TUNNEL_CSUM; 1537 } 1538 1539 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1540 #if IS_ENABLED(CONFIG_IPV6) 1541 if (changelink) { 1542 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1543 goto change_notsup; 1544 } 1545 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1546 info->key.tun_flags &= ~TUNNEL_CSUM; 1547 #else 1548 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1549 "IPv6 support not enabled in the kernel"); 1550 return -EPFNOSUPPORT; 1551 #endif 1552 } 1553 1554 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1555 #if IS_ENABLED(CONFIG_IPV6) 1556 if (changelink) { 1557 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1558 goto change_notsup; 1559 } 1560 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1561 cfg->use_udp6_rx_checksums = false; 1562 #else 1563 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1564 "IPv6 support not enabled in the kernel"); 1565 return -EPFNOSUPPORT; 1566 #endif 1567 } 1568 1569 return 0; 1570 change_notsup: 1571 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1572 "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported"); 1573 return -EOPNOTSUPP; 1574 } 1575 1576 static void geneve_link_config(struct net_device *dev, 1577 struct ip_tunnel_info *info, struct nlattr *tb[]) 1578 { 1579 struct geneve_dev *geneve = netdev_priv(dev); 1580 int ldev_mtu = 0; 1581 1582 if (tb[IFLA_MTU]) { 1583 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1584 return; 1585 } 1586 1587 switch (ip_tunnel_info_af(info)) { 1588 case AF_INET: { 1589 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1590 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1591 1592 if (!IS_ERR(rt) && rt->dst.dev) { 1593 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1594 ip_rt_put(rt); 1595 } 1596 break; 1597 } 1598 #if IS_ENABLED(CONFIG_IPV6) 1599 case AF_INET6: { 1600 struct rt6_info *rt; 1601 1602 if (!__in6_dev_get(dev)) 1603 break; 1604 1605 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1606 NULL, 0); 1607 1608 if (rt && rt->dst.dev) 1609 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1610 ip6_rt_put(rt); 1611 break; 1612 } 1613 #endif 1614 } 1615 1616 if (ldev_mtu <= 0) 1617 return; 1618 1619 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1620 } 1621 1622 static int geneve_newlink(struct net *net, struct net_device *dev, 1623 struct nlattr *tb[], struct nlattr *data[], 1624 struct netlink_ext_ack *extack) 1625 { 1626 struct geneve_config cfg = { 1627 .df = GENEVE_DF_UNSET, 1628 .use_udp6_rx_checksums = false, 1629 .ttl_inherit = false, 1630 .collect_md = false, 1631 }; 1632 int err; 1633 1634 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1635 err = geneve_nl2info(tb, data, extack, &cfg, false); 1636 if (err) 1637 return err; 1638 1639 err = geneve_configure(net, dev, extack, &cfg); 1640 if (err) 1641 return err; 1642 1643 geneve_link_config(dev, &cfg.info, tb); 1644 1645 return 0; 1646 } 1647 1648 /* Quiesces the geneve device data path for both TX and RX. 1649 * 1650 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1651 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1652 * to complete for the existing set of in-flight packets to be transmitted, 1653 * then we would have quiesced the transmit data path. All the future packets 1654 * will get dropped until we unquiesce the data path. 1655 * 1656 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1657 * if we set that to NULL under RCU and wait for synchronize_net() to 1658 * complete, then we would have quiesced the receive data path. 1659 */ 1660 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1661 struct geneve_sock **gs6) 1662 { 1663 *gs4 = rtnl_dereference(geneve->sock4); 1664 rcu_assign_pointer(geneve->sock4, NULL); 1665 if (*gs4) 1666 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1667 #if IS_ENABLED(CONFIG_IPV6) 1668 *gs6 = rtnl_dereference(geneve->sock6); 1669 rcu_assign_pointer(geneve->sock6, NULL); 1670 if (*gs6) 1671 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1672 #else 1673 *gs6 = NULL; 1674 #endif 1675 synchronize_net(); 1676 } 1677 1678 /* Resumes the geneve device data path for both TX and RX. */ 1679 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1680 struct geneve_sock __maybe_unused *gs6) 1681 { 1682 rcu_assign_pointer(geneve->sock4, gs4); 1683 if (gs4) 1684 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1685 #if IS_ENABLED(CONFIG_IPV6) 1686 rcu_assign_pointer(geneve->sock6, gs6); 1687 if (gs6) 1688 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1689 #endif 1690 synchronize_net(); 1691 } 1692 1693 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1694 struct nlattr *data[], 1695 struct netlink_ext_ack *extack) 1696 { 1697 struct geneve_dev *geneve = netdev_priv(dev); 1698 struct geneve_sock *gs4, *gs6; 1699 struct geneve_config cfg; 1700 int err; 1701 1702 /* If the geneve device is configured for metadata (or externally 1703 * controlled, for example, OVS), then nothing can be changed. 1704 */ 1705 if (geneve->cfg.collect_md) 1706 return -EOPNOTSUPP; 1707 1708 /* Start with the existing info. */ 1709 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1710 err = geneve_nl2info(tb, data, extack, &cfg, true); 1711 if (err) 1712 return err; 1713 1714 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1715 dst_cache_reset(&cfg.info.dst_cache); 1716 geneve_link_config(dev, &cfg.info, tb); 1717 } 1718 1719 geneve_quiesce(geneve, &gs4, &gs6); 1720 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1721 geneve_unquiesce(geneve, gs4, gs6); 1722 1723 return 0; 1724 } 1725 1726 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1727 { 1728 struct geneve_dev *geneve = netdev_priv(dev); 1729 1730 list_del(&geneve->next); 1731 unregister_netdevice_queue(dev, head); 1732 } 1733 1734 static size_t geneve_get_size(const struct net_device *dev) 1735 { 1736 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1737 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1738 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1739 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1740 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1741 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1742 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1743 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1744 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1745 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1746 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1747 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1748 0; 1749 } 1750 1751 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1752 { 1753 struct geneve_dev *geneve = netdev_priv(dev); 1754 struct ip_tunnel_info *info = &geneve->cfg.info; 1755 bool ttl_inherit = geneve->cfg.ttl_inherit; 1756 bool metadata = geneve->cfg.collect_md; 1757 __u8 tmp_vni[3]; 1758 __u32 vni; 1759 1760 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1761 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1762 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1763 goto nla_put_failure; 1764 1765 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1766 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1767 info->key.u.ipv4.dst)) 1768 goto nla_put_failure; 1769 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1770 !!(info->key.tun_flags & TUNNEL_CSUM))) 1771 goto nla_put_failure; 1772 1773 #if IS_ENABLED(CONFIG_IPV6) 1774 } else if (!metadata) { 1775 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1776 &info->key.u.ipv6.dst)) 1777 goto nla_put_failure; 1778 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1779 !(info->key.tun_flags & TUNNEL_CSUM))) 1780 goto nla_put_failure; 1781 #endif 1782 } 1783 1784 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1785 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1786 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1787 goto nla_put_failure; 1788 1789 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1790 goto nla_put_failure; 1791 1792 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1793 goto nla_put_failure; 1794 1795 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1796 goto nla_put_failure; 1797 1798 #if IS_ENABLED(CONFIG_IPV6) 1799 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1800 !geneve->cfg.use_udp6_rx_checksums)) 1801 goto nla_put_failure; 1802 #endif 1803 1804 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1805 goto nla_put_failure; 1806 1807 return 0; 1808 1809 nla_put_failure: 1810 return -EMSGSIZE; 1811 } 1812 1813 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1814 .kind = "geneve", 1815 .maxtype = IFLA_GENEVE_MAX, 1816 .policy = geneve_policy, 1817 .priv_size = sizeof(struct geneve_dev), 1818 .setup = geneve_setup, 1819 .validate = geneve_validate, 1820 .newlink = geneve_newlink, 1821 .changelink = geneve_changelink, 1822 .dellink = geneve_dellink, 1823 .get_size = geneve_get_size, 1824 .fill_info = geneve_fill_info, 1825 }; 1826 1827 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1828 u8 name_assign_type, u16 dst_port) 1829 { 1830 struct nlattr *tb[IFLA_MAX + 1]; 1831 struct net_device *dev; 1832 LIST_HEAD(list_kill); 1833 int err; 1834 struct geneve_config cfg = { 1835 .df = GENEVE_DF_UNSET, 1836 .use_udp6_rx_checksums = true, 1837 .ttl_inherit = false, 1838 .collect_md = true, 1839 }; 1840 1841 memset(tb, 0, sizeof(tb)); 1842 dev = rtnl_create_link(net, name, name_assign_type, 1843 &geneve_link_ops, tb, NULL); 1844 if (IS_ERR(dev)) 1845 return dev; 1846 1847 init_tnl_info(&cfg.info, dst_port); 1848 err = geneve_configure(net, dev, NULL, &cfg); 1849 if (err) { 1850 free_netdev(dev); 1851 return ERR_PTR(err); 1852 } 1853 1854 /* openvswitch users expect packet sizes to be unrestricted, 1855 * so set the largest MTU we can. 1856 */ 1857 err = geneve_change_mtu(dev, IP_MAX_MTU); 1858 if (err) 1859 goto err; 1860 1861 err = rtnl_configure_link(dev, NULL); 1862 if (err < 0) 1863 goto err; 1864 1865 return dev; 1866 err: 1867 geneve_dellink(dev, &list_kill); 1868 unregister_netdevice_many(&list_kill); 1869 return ERR_PTR(err); 1870 } 1871 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1872 1873 static int geneve_netdevice_event(struct notifier_block *unused, 1874 unsigned long event, void *ptr) 1875 { 1876 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1877 1878 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1879 geneve_offload_rx_ports(dev, true); 1880 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 1881 geneve_offload_rx_ports(dev, false); 1882 1883 return NOTIFY_DONE; 1884 } 1885 1886 static struct notifier_block geneve_notifier_block __read_mostly = { 1887 .notifier_call = geneve_netdevice_event, 1888 }; 1889 1890 static __net_init int geneve_init_net(struct net *net) 1891 { 1892 struct geneve_net *gn = net_generic(net, geneve_net_id); 1893 1894 INIT_LIST_HEAD(&gn->geneve_list); 1895 INIT_LIST_HEAD(&gn->sock_list); 1896 return 0; 1897 } 1898 1899 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1900 { 1901 struct geneve_net *gn = net_generic(net, geneve_net_id); 1902 struct geneve_dev *geneve, *next; 1903 struct net_device *dev, *aux; 1904 1905 /* gather any geneve devices that were moved into this ns */ 1906 for_each_netdev_safe(net, dev, aux) 1907 if (dev->rtnl_link_ops == &geneve_link_ops) 1908 unregister_netdevice_queue(dev, head); 1909 1910 /* now gather any other geneve devices that were created in this ns */ 1911 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1912 /* If geneve->dev is in the same netns, it was already added 1913 * to the list by the previous loop. 1914 */ 1915 if (!net_eq(dev_net(geneve->dev), net)) 1916 unregister_netdevice_queue(geneve->dev, head); 1917 } 1918 } 1919 1920 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1921 { 1922 struct net *net; 1923 LIST_HEAD(list); 1924 1925 rtnl_lock(); 1926 list_for_each_entry(net, net_list, exit_list) 1927 geneve_destroy_tunnels(net, &list); 1928 1929 /* unregister the devices gathered above */ 1930 unregister_netdevice_many(&list); 1931 rtnl_unlock(); 1932 1933 list_for_each_entry(net, net_list, exit_list) { 1934 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1935 1936 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1937 } 1938 } 1939 1940 static struct pernet_operations geneve_net_ops = { 1941 .init = geneve_init_net, 1942 .exit_batch = geneve_exit_batch_net, 1943 .id = &geneve_net_id, 1944 .size = sizeof(struct geneve_net), 1945 }; 1946 1947 static int __init geneve_init_module(void) 1948 { 1949 int rc; 1950 1951 rc = register_pernet_subsys(&geneve_net_ops); 1952 if (rc) 1953 goto out1; 1954 1955 rc = register_netdevice_notifier(&geneve_notifier_block); 1956 if (rc) 1957 goto out2; 1958 1959 rc = rtnl_link_register(&geneve_link_ops); 1960 if (rc) 1961 goto out3; 1962 1963 return 0; 1964 out3: 1965 unregister_netdevice_notifier(&geneve_notifier_block); 1966 out2: 1967 unregister_pernet_subsys(&geneve_net_ops); 1968 out1: 1969 return rc; 1970 } 1971 late_initcall(geneve_init_module); 1972 1973 static void __exit geneve_cleanup_module(void) 1974 { 1975 rtnl_link_unregister(&geneve_link_ops); 1976 unregister_netdevice_notifier(&geneve_notifier_block); 1977 unregister_pernet_subsys(&geneve_net_ops); 1978 } 1979 module_exit(geneve_cleanup_module); 1980 1981 MODULE_LICENSE("GPL"); 1982 MODULE_VERSION(GENEVE_NETDEV_VER); 1983 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1984 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1985 MODULE_ALIAS_RTNL_LINK("geneve"); 1986