1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * GENEVE: Generic Network Virtualization Encapsulation 4 * 5 * Copyright (c) 2015 Red Hat, Inc. 6 */ 7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10#include <linux/kernel.h> 11#include <linux/module.h> 12#include <linux/etherdevice.h> 13#include <linux/hash.h> 14#include <net/ipv6_stubs.h> 15#include <net/dst_metadata.h> 16#include <net/gro_cells.h> 17#include <net/rtnetlink.h> 18#include <net/geneve.h> 19#include <net/protocol.h> 20 21#define GENEVE_NETDEV_VER "0.6" 22 23#define GENEVE_N_VID (1u << 24) 24#define GENEVE_VID_MASK (GENEVE_N_VID - 1) 25 26#define VNI_HASH_BITS 10 27#define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 28 29static bool log_ecn_error = true; 30module_param(log_ecn_error, bool, 0644); 31MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 32 33#define GENEVE_VER 0 34#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) 35#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN) 36#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN) 37 38/* per-network namespace private data for this module */ 39struct geneve_net { 40 struct list_head geneve_list; 41 struct list_head sock_list; 42}; 43 44static unsigned int geneve_net_id; 45 46struct geneve_dev_node { 47 struct hlist_node hlist; 48 struct geneve_dev *geneve; 49}; 50 51struct geneve_config { 52 struct ip_tunnel_info info; 53 bool collect_md; 54 bool use_udp6_rx_checksums; 55 bool ttl_inherit; 56 enum ifla_geneve_df df; 57}; 58 59/* Pseudo network device */ 60struct geneve_dev { 61 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ 62#if IS_ENABLED(CONFIG_IPV6) 63 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ 64#endif 65 struct net *net; /* netns for packet i/o */ 66 struct net_device *dev; /* netdev for geneve tunnel */ 67 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 68#if IS_ENABLED(CONFIG_IPV6) 69 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ 70#endif 71 struct list_head next; /* geneve's per namespace list */ 72 struct gro_cells gro_cells; 73 struct geneve_config cfg; 74}; 75 76struct geneve_sock { 77 bool collect_md; 78 struct list_head list; 79 struct socket *sock; 80 struct rcu_head rcu; 81 int refcnt; 82 struct hlist_head vni_list[VNI_HASH_SIZE]; 83}; 84 85static inline __u32 geneve_net_vni_hash(u8 vni[3]) 86{ 87 __u32 vnid; 88 89 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 90 return hash_32(vnid, VNI_HASH_BITS); 91} 92 93static __be64 vni_to_tunnel_id(const __u8 *vni) 94{ 95#ifdef __BIG_ENDIAN 96 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 97#else 98 return (__force __be64)(((__force u64)vni[0] << 40) | 99 ((__force u64)vni[1] << 48) | 100 ((__force u64)vni[2] << 56)); 101#endif 102} 103 104/* Convert 64 bit tunnel ID to 24 bit VNI. */ 105static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 106{ 107#ifdef __BIG_ENDIAN 108 vni[0] = (__force __u8)(tun_id >> 16); 109 vni[1] = (__force __u8)(tun_id >> 8); 110 vni[2] = (__force __u8)tun_id; 111#else 112 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 113 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 114 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 115#endif 116} 117 118static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) 119{ 120 return !memcmp(vni, &tun_id[5], 3); 121} 122 123static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 124{ 125 return gs->sock->sk->sk_family; 126} 127 128static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 129 __be32 addr, u8 vni[]) 130{ 131 struct hlist_head *vni_list_head; 132 struct geneve_dev_node *node; 133 __u32 hash; 134 135 /* Find the device for this VNI */ 136 hash = geneve_net_vni_hash(vni); 137 vni_list_head = &gs->vni_list[hash]; 138 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 139 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 140 addr == node->geneve->cfg.info.key.u.ipv4.dst) 141 return node->geneve; 142 } 143 return NULL; 144} 145 146#if IS_ENABLED(CONFIG_IPV6) 147static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 148 struct in6_addr addr6, u8 vni[]) 149{ 150 struct hlist_head *vni_list_head; 151 struct geneve_dev_node *node; 152 __u32 hash; 153 154 /* Find the device for this VNI */ 155 hash = geneve_net_vni_hash(vni); 156 vni_list_head = &gs->vni_list[hash]; 157 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 158 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 159 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst)) 160 return node->geneve; 161 } 162 return NULL; 163} 164#endif 165 166static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 167{ 168 return (struct genevehdr *)(udp_hdr(skb) + 1); 169} 170 171static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 172 struct sk_buff *skb) 173{ 174 static u8 zero_vni[3]; 175 u8 *vni; 176 177 if (geneve_get_sk_family(gs) == AF_INET) { 178 struct iphdr *iph; 179 __be32 addr; 180 181 iph = ip_hdr(skb); /* outer IP header... */ 182 183 if (gs->collect_md) { 184 vni = zero_vni; 185 addr = 0; 186 } else { 187 vni = geneve_hdr(skb)->vni; 188 addr = iph->saddr; 189 } 190 191 return geneve_lookup(gs, addr, vni); 192#if IS_ENABLED(CONFIG_IPV6) 193 } else if (geneve_get_sk_family(gs) == AF_INET6) { 194 static struct in6_addr zero_addr6; 195 struct ipv6hdr *ip6h; 196 struct in6_addr addr6; 197 198 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 199 200 if (gs->collect_md) { 201 vni = zero_vni; 202 addr6 = zero_addr6; 203 } else { 204 vni = geneve_hdr(skb)->vni; 205 addr6 = ip6h->saddr; 206 } 207 208 return geneve6_lookup(gs, addr6, vni); 209#endif 210 } 211 return NULL; 212} 213 214/* geneve receive/decap routine */ 215static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 216 struct sk_buff *skb) 217{ 218 struct genevehdr *gnvh = geneve_hdr(skb); 219 struct metadata_dst *tun_dst = NULL; 220 unsigned int len; 221 int err = 0; 222 void *oiph; 223 224 if (ip_tunnel_collect_metadata() || gs->collect_md) { 225 __be16 flags; 226 227 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) | 228 (gnvh->critical ? TUNNEL_CRIT_OPT : 0); 229 230 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 231 vni_to_tunnel_id(gnvh->vni), 232 gnvh->opt_len * 4); 233 if (!tun_dst) { 234 geneve->dev->stats.rx_dropped++; 235 goto drop; 236 } 237 /* Update tunnel dst according to Geneve options. */ 238 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 239 gnvh->options, gnvh->opt_len * 4, 240 TUNNEL_GENEVE_OPT); 241 } else { 242 /* Drop packets w/ critical options, 243 * since we don't support any... 244 */ 245 if (gnvh->critical) { 246 geneve->dev->stats.rx_frame_errors++; 247 geneve->dev->stats.rx_errors++; 248 goto drop; 249 } 250 } 251 252 skb_reset_mac_header(skb); 253 skb->protocol = eth_type_trans(skb, geneve->dev); 254 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 255 256 if (tun_dst) 257 skb_dst_set(skb, &tun_dst->dst); 258 259 /* Ignore packet loops (and multicast echo) */ 260 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) { 261 geneve->dev->stats.rx_errors++; 262 goto drop; 263 } 264 265 oiph = skb_network_header(skb); 266 skb_reset_network_header(skb); 267 268 if (geneve_get_sk_family(gs) == AF_INET) 269 err = IP_ECN_decapsulate(oiph, skb); 270#if IS_ENABLED(CONFIG_IPV6) 271 else 272 err = IP6_ECN_decapsulate(oiph, skb); 273#endif 274 275 if (unlikely(err)) { 276 if (log_ecn_error) { 277 if (geneve_get_sk_family(gs) == AF_INET) 278 net_info_ratelimited("non-ECT from %pI4 " 279 "with TOS=%#x\n", 280 &((struct iphdr *)oiph)->saddr, 281 ((struct iphdr *)oiph)->tos); 282#if IS_ENABLED(CONFIG_IPV6) 283 else 284 net_info_ratelimited("non-ECT from %pI6\n", 285 &((struct ipv6hdr *)oiph)->saddr); 286#endif 287 } 288 if (err > 1) { 289 ++geneve->dev->stats.rx_frame_errors; 290 ++geneve->dev->stats.rx_errors; 291 goto drop; 292 } 293 } 294 295 len = skb->len; 296 err = gro_cells_receive(&geneve->gro_cells, skb); 297 if (likely(err == NET_RX_SUCCESS)) 298 dev_sw_netstats_rx_add(geneve->dev, len); 299 300 return; 301drop: 302 /* Consume bad packet */ 303 kfree_skb(skb); 304} 305 306/* Setup stats when device is created */ 307static int geneve_init(struct net_device *dev) 308{ 309 struct geneve_dev *geneve = netdev_priv(dev); 310 int err; 311 312 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 313 if (!dev->tstats) 314 return -ENOMEM; 315 316 err = gro_cells_init(&geneve->gro_cells, dev); 317 if (err) { 318 free_percpu(dev->tstats); 319 return err; 320 } 321 322 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 323 if (err) { 324 free_percpu(dev->tstats); 325 gro_cells_destroy(&geneve->gro_cells); 326 return err; 327 } 328 return 0; 329} 330 331static void geneve_uninit(struct net_device *dev) 332{ 333 struct geneve_dev *geneve = netdev_priv(dev); 334 335 dst_cache_destroy(&geneve->cfg.info.dst_cache); 336 gro_cells_destroy(&geneve->gro_cells); 337 free_percpu(dev->tstats); 338} 339 340/* Callback from net/ipv4/udp.c to receive packets */ 341static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 342{ 343 struct genevehdr *geneveh; 344 struct geneve_dev *geneve; 345 struct geneve_sock *gs; 346 int opts_len; 347 348 /* Need UDP and Geneve header to be present */ 349 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 350 goto drop; 351 352 /* Return packets with reserved bits set */ 353 geneveh = geneve_hdr(skb); 354 if (unlikely(geneveh->ver != GENEVE_VER)) 355 goto drop; 356 357 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) 358 goto drop; 359 360 gs = rcu_dereference_sk_user_data(sk); 361 if (!gs) 362 goto drop; 363 364 geneve = geneve_lookup_skb(gs, skb); 365 if (!geneve) 366 goto drop; 367 368 opts_len = geneveh->opt_len * 4; 369 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, 370 htons(ETH_P_TEB), 371 !net_eq(geneve->net, dev_net(geneve->dev)))) { 372 geneve->dev->stats.rx_dropped++; 373 goto drop; 374 } 375 376 geneve_rx(geneve, gs, skb); 377 return 0; 378 379drop: 380 /* Consume bad packet */ 381 kfree_skb(skb); 382 return 0; 383} 384 385/* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 386static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 387{ 388 struct genevehdr *geneveh; 389 struct geneve_sock *gs; 390 u8 zero_vni[3] = { 0 }; 391 u8 *vni = zero_vni; 392 393 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 394 return -EINVAL; 395 396 geneveh = geneve_hdr(skb); 397 if (geneveh->ver != GENEVE_VER) 398 return -EINVAL; 399 400 if (geneveh->proto_type != htons(ETH_P_TEB)) 401 return -EINVAL; 402 403 gs = rcu_dereference_sk_user_data(sk); 404 if (!gs) 405 return -ENOENT; 406 407 if (geneve_get_sk_family(gs) == AF_INET) { 408 struct iphdr *iph = ip_hdr(skb); 409 __be32 addr4 = 0; 410 411 if (!gs->collect_md) { 412 vni = geneve_hdr(skb)->vni; 413 addr4 = iph->daddr; 414 } 415 416 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 417 } 418 419#if IS_ENABLED(CONFIG_IPV6) 420 if (geneve_get_sk_family(gs) == AF_INET6) { 421 struct ipv6hdr *ip6h = ipv6_hdr(skb); 422 struct in6_addr addr6; 423 424 memset(&addr6, 0, sizeof(struct in6_addr)); 425 426 if (!gs->collect_md) { 427 vni = geneve_hdr(skb)->vni; 428 addr6 = ip6h->daddr; 429 } 430 431 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 432 } 433#endif 434 435 return -EPFNOSUPPORT; 436} 437 438static struct socket *geneve_create_sock(struct net *net, bool ipv6, 439 __be16 port, bool ipv6_rx_csum) 440{ 441 struct socket *sock; 442 struct udp_port_cfg udp_conf; 443 int err; 444 445 memset(&udp_conf, 0, sizeof(udp_conf)); 446 447 if (ipv6) { 448 udp_conf.family = AF_INET6; 449 udp_conf.ipv6_v6only = 1; 450 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 451 } else { 452 udp_conf.family = AF_INET; 453 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 454 } 455 456 udp_conf.local_udp_port = port; 457 458 /* Open UDP socket */ 459 err = udp_sock_create(net, &udp_conf, &sock); 460 if (err < 0) 461 return ERR_PTR(err); 462 463 return sock; 464} 465 466static int geneve_hlen(struct genevehdr *gh) 467{ 468 return sizeof(*gh) + gh->opt_len * 4; 469} 470 471static struct sk_buff *geneve_gro_receive(struct sock *sk, 472 struct list_head *head, 473 struct sk_buff *skb) 474{ 475 struct sk_buff *pp = NULL; 476 struct sk_buff *p; 477 struct genevehdr *gh, *gh2; 478 unsigned int hlen, gh_len, off_gnv; 479 const struct packet_offload *ptype; 480 __be16 type; 481 int flush = 1; 482 483 off_gnv = skb_gro_offset(skb); 484 hlen = off_gnv + sizeof(*gh); 485 gh = skb_gro_header_fast(skb, off_gnv); 486 if (skb_gro_header_hard(skb, hlen)) { 487 gh = skb_gro_header_slow(skb, hlen, off_gnv); 488 if (unlikely(!gh)) 489 goto out; 490 } 491 492 if (gh->ver != GENEVE_VER || gh->oam) 493 goto out; 494 gh_len = geneve_hlen(gh); 495 496 hlen = off_gnv + gh_len; 497 if (skb_gro_header_hard(skb, hlen)) { 498 gh = skb_gro_header_slow(skb, hlen, off_gnv); 499 if (unlikely(!gh)) 500 goto out; 501 } 502 503 list_for_each_entry(p, head, list) { 504 if (!NAPI_GRO_CB(p)->same_flow) 505 continue; 506 507 gh2 = (struct genevehdr *)(p->data + off_gnv); 508 if (gh->opt_len != gh2->opt_len || 509 memcmp(gh, gh2, gh_len)) { 510 NAPI_GRO_CB(p)->same_flow = 0; 511 continue; 512 } 513 } 514 515 type = gh->proto_type; 516 517 rcu_read_lock(); 518 ptype = gro_find_receive_by_type(type); 519 if (!ptype) 520 goto out_unlock; 521 522 skb_gro_pull(skb, gh_len); 523 skb_gro_postpull_rcsum(skb, gh, gh_len); 524 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 525 flush = 0; 526 527out_unlock: 528 rcu_read_unlock(); 529out: 530 skb_gro_flush_final(skb, pp, flush); 531 532 return pp; 533} 534 535static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 536 int nhoff) 537{ 538 struct genevehdr *gh; 539 struct packet_offload *ptype; 540 __be16 type; 541 int gh_len; 542 int err = -ENOSYS; 543 544 gh = (struct genevehdr *)(skb->data + nhoff); 545 gh_len = geneve_hlen(gh); 546 type = gh->proto_type; 547 548 rcu_read_lock(); 549 ptype = gro_find_complete_by_type(type); 550 if (ptype) 551 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 552 553 rcu_read_unlock(); 554 555 skb_set_inner_mac_header(skb, nhoff + gh_len); 556 557 return err; 558} 559 560/* Create new listen socket if needed */ 561static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 562 bool ipv6, bool ipv6_rx_csum) 563{ 564 struct geneve_net *gn = net_generic(net, geneve_net_id); 565 struct geneve_sock *gs; 566 struct socket *sock; 567 struct udp_tunnel_sock_cfg tunnel_cfg; 568 int h; 569 570 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 571 if (!gs) 572 return ERR_PTR(-ENOMEM); 573 574 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 575 if (IS_ERR(sock)) { 576 kfree(gs); 577 return ERR_CAST(sock); 578 } 579 580 gs->sock = sock; 581 gs->refcnt = 1; 582 for (h = 0; h < VNI_HASH_SIZE; ++h) 583 INIT_HLIST_HEAD(&gs->vni_list[h]); 584 585 /* Initialize the geneve udp offloads structure */ 586 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 587 588 /* Mark socket as an encapsulation socket */ 589 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 590 tunnel_cfg.sk_user_data = gs; 591 tunnel_cfg.encap_type = 1; 592 tunnel_cfg.gro_receive = geneve_gro_receive; 593 tunnel_cfg.gro_complete = geneve_gro_complete; 594 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 595 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 596 tunnel_cfg.encap_destroy = NULL; 597 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 598 list_add(&gs->list, &gn->sock_list); 599 return gs; 600} 601 602static void __geneve_sock_release(struct geneve_sock *gs) 603{ 604 if (!gs || --gs->refcnt) 605 return; 606 607 list_del(&gs->list); 608 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 609 udp_tunnel_sock_release(gs->sock); 610 kfree_rcu(gs, rcu); 611} 612 613static void geneve_sock_release(struct geneve_dev *geneve) 614{ 615 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 616#if IS_ENABLED(CONFIG_IPV6) 617 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 618 619 rcu_assign_pointer(geneve->sock6, NULL); 620#endif 621 622 rcu_assign_pointer(geneve->sock4, NULL); 623 synchronize_net(); 624 625 __geneve_sock_release(gs4); 626#if IS_ENABLED(CONFIG_IPV6) 627 __geneve_sock_release(gs6); 628#endif 629} 630 631static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 632 sa_family_t family, 633 __be16 dst_port) 634{ 635 struct geneve_sock *gs; 636 637 list_for_each_entry(gs, &gn->sock_list, list) { 638 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 639 geneve_get_sk_family(gs) == family) { 640 return gs; 641 } 642 } 643 return NULL; 644} 645 646static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 647{ 648 struct net *net = geneve->net; 649 struct geneve_net *gn = net_generic(net, geneve_net_id); 650 struct geneve_dev_node *node; 651 struct geneve_sock *gs; 652 __u8 vni[3]; 653 __u32 hash; 654 655 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 656 if (gs) { 657 gs->refcnt++; 658 goto out; 659 } 660 661 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 662 geneve->cfg.use_udp6_rx_checksums); 663 if (IS_ERR(gs)) 664 return PTR_ERR(gs); 665 666out: 667 gs->collect_md = geneve->cfg.collect_md; 668#if IS_ENABLED(CONFIG_IPV6) 669 if (ipv6) { 670 rcu_assign_pointer(geneve->sock6, gs); 671 node = &geneve->hlist6; 672 } else 673#endif 674 { 675 rcu_assign_pointer(geneve->sock4, gs); 676 node = &geneve->hlist4; 677 } 678 node->geneve = geneve; 679 680 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 681 hash = geneve_net_vni_hash(vni); 682 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 683 return 0; 684} 685 686static int geneve_open(struct net_device *dev) 687{ 688 struct geneve_dev *geneve = netdev_priv(dev); 689 bool metadata = geneve->cfg.collect_md; 690 bool ipv4, ipv6; 691 int ret = 0; 692 693 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 694 ipv4 = !ipv6 || metadata; 695#if IS_ENABLED(CONFIG_IPV6) 696 if (ipv6) { 697 ret = geneve_sock_add(geneve, true); 698 if (ret < 0 && ret != -EAFNOSUPPORT) 699 ipv4 = false; 700 } 701#endif 702 if (ipv4) 703 ret = geneve_sock_add(geneve, false); 704 if (ret < 0) 705 geneve_sock_release(geneve); 706 707 return ret; 708} 709 710static int geneve_stop(struct net_device *dev) 711{ 712 struct geneve_dev *geneve = netdev_priv(dev); 713 714 hlist_del_init_rcu(&geneve->hlist4.hlist); 715#if IS_ENABLED(CONFIG_IPV6) 716 hlist_del_init_rcu(&geneve->hlist6.hlist); 717#endif 718 geneve_sock_release(geneve); 719 return 0; 720} 721 722static void geneve_build_header(struct genevehdr *geneveh, 723 const struct ip_tunnel_info *info) 724{ 725 geneveh->ver = GENEVE_VER; 726 geneveh->opt_len = info->options_len / 4; 727 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 728 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 729 geneveh->rsvd1 = 0; 730 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 731 geneveh->proto_type = htons(ETH_P_TEB); 732 geneveh->rsvd2 = 0; 733 734 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 735 ip_tunnel_info_opts_get(geneveh->options, info); 736} 737 738static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 739 const struct ip_tunnel_info *info, 740 bool xnet, int ip_hdr_len) 741{ 742 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 743 struct genevehdr *gnvh; 744 int min_headroom; 745 int err; 746 747 skb_reset_mac_header(skb); 748 skb_scrub_packet(skb, xnet); 749 750 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 751 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 752 err = skb_cow_head(skb, min_headroom); 753 if (unlikely(err)) 754 goto free_dst; 755 756 err = udp_tunnel_handle_offloads(skb, udp_sum); 757 if (err) 758 goto free_dst; 759 760 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 761 geneve_build_header(gnvh, info); 762 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 763 return 0; 764 765free_dst: 766 dst_release(dst); 767 return err; 768} 769 770static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 771 struct net_device *dev, 772 struct geneve_sock *gs4, 773 struct flowi4 *fl4, 774 const struct ip_tunnel_info *info, 775 __be16 dport, __be16 sport, 776 __u8 *full_tos) 777{ 778 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 779 struct geneve_dev *geneve = netdev_priv(dev); 780 struct dst_cache *dst_cache; 781 struct rtable *rt = NULL; 782 __u8 tos; 783 784 if (!gs4) 785 return ERR_PTR(-EIO); 786 787 memset(fl4, 0, sizeof(*fl4)); 788 fl4->flowi4_mark = skb->mark; 789 fl4->flowi4_proto = IPPROTO_UDP; 790 fl4->daddr = info->key.u.ipv4.dst; 791 fl4->saddr = info->key.u.ipv4.src; 792 fl4->fl4_dport = dport; 793 fl4->fl4_sport = sport; 794 795 tos = info->key.tos; 796 if ((tos == 1) && !geneve->cfg.collect_md) { 797 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 798 use_cache = false; 799 } 800 fl4->flowi4_tos = RT_TOS(tos); 801 if (full_tos) 802 *full_tos = tos; 803 804 dst_cache = (struct dst_cache *)&info->dst_cache; 805 if (use_cache) { 806 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 807 if (rt) 808 return rt; 809 } 810 rt = ip_route_output_key(geneve->net, fl4); 811 if (IS_ERR(rt)) { 812 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 813 return ERR_PTR(-ENETUNREACH); 814 } 815 if (rt->dst.dev == dev) { /* is this necessary? */ 816 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 817 ip_rt_put(rt); 818 return ERR_PTR(-ELOOP); 819 } 820 if (use_cache) 821 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 822 return rt; 823} 824 825#if IS_ENABLED(CONFIG_IPV6) 826static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 827 struct net_device *dev, 828 struct geneve_sock *gs6, 829 struct flowi6 *fl6, 830 const struct ip_tunnel_info *info, 831 __be16 dport, __be16 sport) 832{ 833 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 834 struct geneve_dev *geneve = netdev_priv(dev); 835 struct dst_entry *dst = NULL; 836 struct dst_cache *dst_cache; 837 __u8 prio; 838 839 if (!gs6) 840 return ERR_PTR(-EIO); 841 842 memset(fl6, 0, sizeof(*fl6)); 843 fl6->flowi6_mark = skb->mark; 844 fl6->flowi6_proto = IPPROTO_UDP; 845 fl6->daddr = info->key.u.ipv6.dst; 846 fl6->saddr = info->key.u.ipv6.src; 847 fl6->fl6_dport = dport; 848 fl6->fl6_sport = sport; 849 850 prio = info->key.tos; 851 if ((prio == 1) && !geneve->cfg.collect_md) { 852 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 853 use_cache = false; 854 } 855 856 fl6->flowlabel = ip6_make_flowinfo(prio, 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 881static 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 full_tos; 891 __u8 tos, ttl; 892 __be16 df = 0; 893 __be16 sport; 894 int err; 895 896 if (!pskb_inet_may_pull(skb)) 897 return -EINVAL; 898 899 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 900 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 901 geneve->cfg.info.key.tp_dst, sport, &full_tos); 902 if (IS_ERR(rt)) 903 return PTR_ERR(rt); 904 905 err = skb_tunnel_check_pmtu(skb, &rt->dst, 906 GENEVE_IPV4_HLEN + info->options_len, 907 netif_is_any_bridge_port(dev)); 908 if (err < 0) { 909 dst_release(&rt->dst); 910 return err; 911 } else if (err) { 912 struct ip_tunnel_info *info; 913 914 info = skb_tunnel_info(skb); 915 if (info) { 916 struct ip_tunnel_info *unclone; 917 918 unclone = skb_tunnel_info_unclone(skb); 919 if (unlikely(!unclone)) { 920 dst_release(&rt->dst); 921 return -ENOMEM; 922 } 923 924 unclone->key.u.ipv4.dst = fl4.saddr; 925 unclone->key.u.ipv4.src = fl4.daddr; 926 } 927 928 if (!pskb_may_pull(skb, ETH_HLEN)) { 929 dst_release(&rt->dst); 930 return -EINVAL; 931 } 932 933 skb->protocol = eth_type_trans(skb, geneve->dev); 934 netif_rx(skb); 935 dst_release(&rt->dst); 936 return -EMSGSIZE; 937 } 938 939 if (geneve->cfg.collect_md) { 940 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 941 ttl = key->ttl; 942 943 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 944 } else { 945 tos = ip_tunnel_ecn_encap(full_tos, ip_hdr(skb), skb); 946 if (geneve->cfg.ttl_inherit) 947 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 948 else 949 ttl = key->ttl; 950 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 951 952 if (geneve->cfg.df == GENEVE_DF_SET) { 953 df = htons(IP_DF); 954 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 955 struct ethhdr *eth = eth_hdr(skb); 956 957 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 958 df = htons(IP_DF); 959 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 960 struct iphdr *iph = ip_hdr(skb); 961 962 if (iph->frag_off & htons(IP_DF)) 963 df = htons(IP_DF); 964 } 965 } 966 } 967 968 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr)); 969 if (unlikely(err)) 970 return err; 971 972 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 973 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 974 !net_eq(geneve->net, dev_net(geneve->dev)), 975 !(info->key.tun_flags & TUNNEL_CSUM)); 976 return 0; 977} 978 979#if IS_ENABLED(CONFIG_IPV6) 980static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 981 struct geneve_dev *geneve, 982 const struct ip_tunnel_info *info) 983{ 984 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 985 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 986 const struct ip_tunnel_key *key = &info->key; 987 struct dst_entry *dst = NULL; 988 struct flowi6 fl6; 989 __u8 prio, ttl; 990 __be16 sport; 991 int err; 992 993 if (!pskb_inet_may_pull(skb)) 994 return -EINVAL; 995 996 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 997 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 998 geneve->cfg.info.key.tp_dst, sport); 999 if (IS_ERR(dst)) 1000 return PTR_ERR(dst); 1001 1002 err = skb_tunnel_check_pmtu(skb, dst, 1003 GENEVE_IPV6_HLEN + info->options_len, 1004 netif_is_any_bridge_port(dev)); 1005 if (err < 0) { 1006 dst_release(dst); 1007 return err; 1008 } else if (err) { 1009 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1010 1011 if (info) { 1012 struct ip_tunnel_info *unclone; 1013 1014 unclone = skb_tunnel_info_unclone(skb); 1015 if (unlikely(!unclone)) { 1016 dst_release(dst); 1017 return -ENOMEM; 1018 } 1019 1020 unclone->key.u.ipv6.dst = fl6.saddr; 1021 unclone->key.u.ipv6.src = fl6.daddr; 1022 } 1023 1024 if (!pskb_may_pull(skb, ETH_HLEN)) { 1025 dst_release(dst); 1026 return -EINVAL; 1027 } 1028 1029 skb->protocol = eth_type_trans(skb, geneve->dev); 1030 netif_rx(skb); 1031 dst_release(dst); 1032 return -EMSGSIZE; 1033 } 1034 1035 if (geneve->cfg.collect_md) { 1036 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 1037 ttl = key->ttl; 1038 } else { 1039 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1040 ip_hdr(skb), skb); 1041 if (geneve->cfg.ttl_inherit) 1042 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1043 else 1044 ttl = key->ttl; 1045 ttl = ttl ? : ip6_dst_hoplimit(dst); 1046 } 1047 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr)); 1048 if (unlikely(err)) 1049 return err; 1050 1051 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1052 &fl6.saddr, &fl6.daddr, prio, ttl, 1053 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1054 !(info->key.tun_flags & TUNNEL_CSUM)); 1055 return 0; 1056} 1057#endif 1058 1059static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1060{ 1061 struct geneve_dev *geneve = netdev_priv(dev); 1062 struct ip_tunnel_info *info = NULL; 1063 int err; 1064 1065 if (geneve->cfg.collect_md) { 1066 info = skb_tunnel_info(skb); 1067 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1068 netdev_dbg(dev, "no tunnel metadata\n"); 1069 dev_kfree_skb(skb); 1070 dev->stats.tx_dropped++; 1071 return NETDEV_TX_OK; 1072 } 1073 } else { 1074 info = &geneve->cfg.info; 1075 } 1076 1077 rcu_read_lock(); 1078#if IS_ENABLED(CONFIG_IPV6) 1079 if (info->mode & IP_TUNNEL_INFO_IPV6) 1080 err = geneve6_xmit_skb(skb, dev, geneve, info); 1081 else 1082#endif 1083 err = geneve_xmit_skb(skb, dev, geneve, info); 1084 rcu_read_unlock(); 1085 1086 if (likely(!err)) 1087 return NETDEV_TX_OK; 1088 1089 if (err != -EMSGSIZE) 1090 dev_kfree_skb(skb); 1091 1092 if (err == -ELOOP) 1093 dev->stats.collisions++; 1094 else if (err == -ENETUNREACH) 1095 dev->stats.tx_carrier_errors++; 1096 1097 dev->stats.tx_errors++; 1098 return NETDEV_TX_OK; 1099} 1100 1101static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1102{ 1103 if (new_mtu > dev->max_mtu) 1104 new_mtu = dev->max_mtu; 1105 else if (new_mtu < dev->min_mtu) 1106 new_mtu = dev->min_mtu; 1107 1108 dev->mtu = new_mtu; 1109 return 0; 1110} 1111 1112static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1113{ 1114 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1115 struct geneve_dev *geneve = netdev_priv(dev); 1116 __be16 sport; 1117 1118 if (ip_tunnel_info_af(info) == AF_INET) { 1119 struct rtable *rt; 1120 struct flowi4 fl4; 1121 1122 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1123 sport = udp_flow_src_port(geneve->net, skb, 1124 1, USHRT_MAX, true); 1125 1126 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 1127 geneve->cfg.info.key.tp_dst, sport, NULL); 1128 if (IS_ERR(rt)) 1129 return PTR_ERR(rt); 1130 1131 ip_rt_put(rt); 1132 info->key.u.ipv4.src = fl4.saddr; 1133#if IS_ENABLED(CONFIG_IPV6) 1134 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1135 struct dst_entry *dst; 1136 struct flowi6 fl6; 1137 1138 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1139 sport = udp_flow_src_port(geneve->net, skb, 1140 1, USHRT_MAX, true); 1141 1142 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1143 geneve->cfg.info.key.tp_dst, sport); 1144 if (IS_ERR(dst)) 1145 return PTR_ERR(dst); 1146 1147 dst_release(dst); 1148 info->key.u.ipv6.src = fl6.saddr; 1149#endif 1150 } else { 1151 return -EINVAL; 1152 } 1153 1154 info->key.tp_src = sport; 1155 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1156 return 0; 1157} 1158 1159static const struct net_device_ops geneve_netdev_ops = { 1160 .ndo_init = geneve_init, 1161 .ndo_uninit = geneve_uninit, 1162 .ndo_open = geneve_open, 1163 .ndo_stop = geneve_stop, 1164 .ndo_start_xmit = geneve_xmit, 1165 .ndo_get_stats64 = ip_tunnel_get_stats64, 1166 .ndo_change_mtu = geneve_change_mtu, 1167 .ndo_validate_addr = eth_validate_addr, 1168 .ndo_set_mac_address = eth_mac_addr, 1169 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1170}; 1171 1172static void geneve_get_drvinfo(struct net_device *dev, 1173 struct ethtool_drvinfo *drvinfo) 1174{ 1175 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1176 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1177} 1178 1179static const struct ethtool_ops geneve_ethtool_ops = { 1180 .get_drvinfo = geneve_get_drvinfo, 1181 .get_link = ethtool_op_get_link, 1182}; 1183 1184/* Info for udev, that this is a virtual tunnel endpoint */ 1185static struct device_type geneve_type = { 1186 .name = "geneve", 1187}; 1188 1189/* Calls the ndo_udp_tunnel_add of the caller in order to 1190 * supply the listening GENEVE udp ports. Callers are expected 1191 * to implement the ndo_udp_tunnel_add. 1192 */ 1193static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1194{ 1195 struct net *net = dev_net(dev); 1196 struct geneve_net *gn = net_generic(net, geneve_net_id); 1197 struct geneve_sock *gs; 1198 1199 rcu_read_lock(); 1200 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1201 if (push) { 1202 udp_tunnel_push_rx_port(dev, gs->sock, 1203 UDP_TUNNEL_TYPE_GENEVE); 1204 } else { 1205 udp_tunnel_drop_rx_port(dev, gs->sock, 1206 UDP_TUNNEL_TYPE_GENEVE); 1207 } 1208 } 1209 rcu_read_unlock(); 1210} 1211 1212/* Initialize the device structure. */ 1213static void geneve_setup(struct net_device *dev) 1214{ 1215 ether_setup(dev); 1216 1217 dev->netdev_ops = &geneve_netdev_ops; 1218 dev->ethtool_ops = &geneve_ethtool_ops; 1219 dev->needs_free_netdev = true; 1220 1221 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1222 1223 dev->features |= NETIF_F_LLTX; 1224 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1225 dev->features |= NETIF_F_RXCSUM; 1226 dev->features |= NETIF_F_GSO_SOFTWARE; 1227 1228 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | 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 1245static 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 1261static 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 1307static 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 1329static 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 1336static 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 1345static 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 1404static 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 1410static 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; 1570change_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 1576static 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 1622static 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 */ 1660static 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. */ 1679static 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 1693static 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 1726static 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 1734static 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 1751static 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 1809nla_put_failure: 1810 return -EMSGSIZE; 1811} 1812 1813static 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 1827struct 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; 1866err: 1867 geneve_dellink(dev, &list_kill); 1868 unregister_netdevice_many(&list_kill); 1869 return ERR_PTR(err); 1870} 1871EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1872 1873static 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 event == NETDEV_UDP_TUNNEL_DROP_INFO) { 1880 geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO); 1881 } else if (event == NETDEV_UNREGISTER) { 1882 if (!dev->udp_tunnel_nic_info) 1883 geneve_offload_rx_ports(dev, false); 1884 } else if (event == NETDEV_REGISTER) { 1885 if (!dev->udp_tunnel_nic_info) 1886 geneve_offload_rx_ports(dev, true); 1887 } 1888 1889 return NOTIFY_DONE; 1890} 1891 1892static struct notifier_block geneve_notifier_block __read_mostly = { 1893 .notifier_call = geneve_netdevice_event, 1894}; 1895 1896static __net_init int geneve_init_net(struct net *net) 1897{ 1898 struct geneve_net *gn = net_generic(net, geneve_net_id); 1899 1900 INIT_LIST_HEAD(&gn->geneve_list); 1901 INIT_LIST_HEAD(&gn->sock_list); 1902 return 0; 1903} 1904 1905static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1906{ 1907 struct geneve_net *gn = net_generic(net, geneve_net_id); 1908 struct geneve_dev *geneve, *next; 1909 struct net_device *dev, *aux; 1910 1911 /* gather any geneve devices that were moved into this ns */ 1912 for_each_netdev_safe(net, dev, aux) 1913 if (dev->rtnl_link_ops == &geneve_link_ops) 1914 unregister_netdevice_queue(dev, head); 1915 1916 /* now gather any other geneve devices that were created in this ns */ 1917 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1918 /* If geneve->dev is in the same netns, it was already added 1919 * to the list by the previous loop. 1920 */ 1921 if (!net_eq(dev_net(geneve->dev), net)) 1922 unregister_netdevice_queue(geneve->dev, head); 1923 } 1924} 1925 1926static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1927{ 1928 struct net *net; 1929 LIST_HEAD(list); 1930 1931 rtnl_lock(); 1932 list_for_each_entry(net, net_list, exit_list) 1933 geneve_destroy_tunnels(net, &list); 1934 1935 /* unregister the devices gathered above */ 1936 unregister_netdevice_many(&list); 1937 rtnl_unlock(); 1938 1939 list_for_each_entry(net, net_list, exit_list) { 1940 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1941 1942 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1943 } 1944} 1945 1946static struct pernet_operations geneve_net_ops = { 1947 .init = geneve_init_net, 1948 .exit_batch = geneve_exit_batch_net, 1949 .id = &geneve_net_id, 1950 .size = sizeof(struct geneve_net), 1951}; 1952 1953static int __init geneve_init_module(void) 1954{ 1955 int rc; 1956 1957 rc = register_pernet_subsys(&geneve_net_ops); 1958 if (rc) 1959 goto out1; 1960 1961 rc = register_netdevice_notifier(&geneve_notifier_block); 1962 if (rc) 1963 goto out2; 1964 1965 rc = rtnl_link_register(&geneve_link_ops); 1966 if (rc) 1967 goto out3; 1968 1969 return 0; 1970out3: 1971 unregister_netdevice_notifier(&geneve_notifier_block); 1972out2: 1973 unregister_pernet_subsys(&geneve_net_ops); 1974out1: 1975 return rc; 1976} 1977late_initcall(geneve_init_module); 1978 1979static void __exit geneve_cleanup_module(void) 1980{ 1981 rtnl_link_unregister(&geneve_link_ops); 1982 unregister_netdevice_notifier(&geneve_notifier_block); 1983 unregister_pernet_subsys(&geneve_net_ops); 1984} 1985module_exit(geneve_cleanup_module); 1986 1987MODULE_LICENSE("GPL"); 1988MODULE_VERSION(GENEVE_NETDEV_VER); 1989MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1990MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1991MODULE_ALIAS_RTNL_LINK("geneve"); 1992