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