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 bool inner_proto_inherit; 60 }; 61 62 /* Pseudo network device */ 63 struct geneve_dev { 64 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ 65 #if IS_ENABLED(CONFIG_IPV6) 66 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ 67 #endif 68 struct net *net; /* netns for packet i/o */ 69 struct net_device *dev; /* netdev for geneve tunnel */ 70 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 71 #if IS_ENABLED(CONFIG_IPV6) 72 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ 73 #endif 74 struct list_head next; /* geneve's per namespace list */ 75 struct gro_cells gro_cells; 76 struct geneve_config cfg; 77 }; 78 79 struct geneve_sock { 80 bool collect_md; 81 struct list_head list; 82 struct socket *sock; 83 struct rcu_head rcu; 84 int refcnt; 85 struct hlist_head vni_list[VNI_HASH_SIZE]; 86 }; 87 88 static inline __u32 geneve_net_vni_hash(u8 vni[3]) 89 { 90 __u32 vnid; 91 92 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 93 return hash_32(vnid, VNI_HASH_BITS); 94 } 95 96 static __be64 vni_to_tunnel_id(const __u8 *vni) 97 { 98 #ifdef __BIG_ENDIAN 99 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 100 #else 101 return (__force __be64)(((__force u64)vni[0] << 40) | 102 ((__force u64)vni[1] << 48) | 103 ((__force u64)vni[2] << 56)); 104 #endif 105 } 106 107 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 108 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 109 { 110 #ifdef __BIG_ENDIAN 111 vni[0] = (__force __u8)(tun_id >> 16); 112 vni[1] = (__force __u8)(tun_id >> 8); 113 vni[2] = (__force __u8)tun_id; 114 #else 115 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 116 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 117 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 118 #endif 119 } 120 121 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) 122 { 123 return !memcmp(vni, &tun_id[5], 3); 124 } 125 126 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 127 { 128 return gs->sock->sk->sk_family; 129 } 130 131 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 132 __be32 addr, u8 vni[]) 133 { 134 struct hlist_head *vni_list_head; 135 struct geneve_dev_node *node; 136 __u32 hash; 137 138 /* Find the device for this VNI */ 139 hash = geneve_net_vni_hash(vni); 140 vni_list_head = &gs->vni_list[hash]; 141 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 142 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 143 addr == node->geneve->cfg.info.key.u.ipv4.dst) 144 return node->geneve; 145 } 146 return NULL; 147 } 148 149 #if IS_ENABLED(CONFIG_IPV6) 150 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 151 struct in6_addr addr6, u8 vni[]) 152 { 153 struct hlist_head *vni_list_head; 154 struct geneve_dev_node *node; 155 __u32 hash; 156 157 /* Find the device for this VNI */ 158 hash = geneve_net_vni_hash(vni); 159 vni_list_head = &gs->vni_list[hash]; 160 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 161 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 162 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst)) 163 return node->geneve; 164 } 165 return NULL; 166 } 167 #endif 168 169 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 170 { 171 return (struct genevehdr *)(udp_hdr(skb) + 1); 172 } 173 174 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 175 struct sk_buff *skb) 176 { 177 static u8 zero_vni[3]; 178 u8 *vni; 179 180 if (geneve_get_sk_family(gs) == AF_INET) { 181 struct iphdr *iph; 182 __be32 addr; 183 184 iph = ip_hdr(skb); /* outer IP header... */ 185 186 if (gs->collect_md) { 187 vni = zero_vni; 188 addr = 0; 189 } else { 190 vni = geneve_hdr(skb)->vni; 191 addr = iph->saddr; 192 } 193 194 return geneve_lookup(gs, addr, vni); 195 #if IS_ENABLED(CONFIG_IPV6) 196 } else if (geneve_get_sk_family(gs) == AF_INET6) { 197 static struct in6_addr zero_addr6; 198 struct ipv6hdr *ip6h; 199 struct in6_addr addr6; 200 201 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 202 203 if (gs->collect_md) { 204 vni = zero_vni; 205 addr6 = zero_addr6; 206 } else { 207 vni = geneve_hdr(skb)->vni; 208 addr6 = ip6h->saddr; 209 } 210 211 return geneve6_lookup(gs, addr6, vni); 212 #endif 213 } 214 return NULL; 215 } 216 217 /* geneve receive/decap routine */ 218 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 219 struct sk_buff *skb) 220 { 221 struct genevehdr *gnvh = geneve_hdr(skb); 222 struct metadata_dst *tun_dst = NULL; 223 unsigned int len; 224 int nh, err = 0; 225 void *oiph; 226 227 if (ip_tunnel_collect_metadata() || gs->collect_md) { 228 __be16 flags; 229 230 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) | 231 (gnvh->critical ? TUNNEL_CRIT_OPT : 0); 232 233 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 234 vni_to_tunnel_id(gnvh->vni), 235 gnvh->opt_len * 4); 236 if (!tun_dst) { 237 DEV_STATS_INC(geneve->dev, rx_dropped); 238 goto drop; 239 } 240 /* Update tunnel dst according to Geneve options. */ 241 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 242 gnvh->options, gnvh->opt_len * 4, 243 TUNNEL_GENEVE_OPT); 244 } else { 245 /* Drop packets w/ critical options, 246 * since we don't support any... 247 */ 248 if (gnvh->critical) { 249 DEV_STATS_INC(geneve->dev, rx_frame_errors); 250 DEV_STATS_INC(geneve->dev, rx_errors); 251 goto drop; 252 } 253 } 254 255 if (tun_dst) 256 skb_dst_set(skb, &tun_dst->dst); 257 258 if (gnvh->proto_type == htons(ETH_P_TEB)) { 259 skb_reset_mac_header(skb); 260 skb->protocol = eth_type_trans(skb, geneve->dev); 261 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 262 263 /* Ignore packet loops (and multicast echo) */ 264 if (ether_addr_equal(eth_hdr(skb)->h_source, 265 geneve->dev->dev_addr)) { 266 DEV_STATS_INC(geneve->dev, rx_errors); 267 goto drop; 268 } 269 } else { 270 skb_reset_mac_header(skb); 271 skb->dev = geneve->dev; 272 skb->pkt_type = PACKET_HOST; 273 } 274 275 /* Save offset of outer header relative to skb->head, 276 * because we are going to reset the network header to the inner header 277 * and might change skb->head. 278 */ 279 nh = skb_network_header(skb) - skb->head; 280 281 skb_reset_network_header(skb); 282 283 if (!pskb_inet_may_pull(skb)) { 284 DEV_STATS_INC(geneve->dev, rx_length_errors); 285 DEV_STATS_INC(geneve->dev, rx_errors); 286 goto drop; 287 } 288 289 /* Get the outer header. */ 290 oiph = skb->head + nh; 291 292 if (geneve_get_sk_family(gs) == AF_INET) 293 err = IP_ECN_decapsulate(oiph, skb); 294 #if IS_ENABLED(CONFIG_IPV6) 295 else 296 err = IP6_ECN_decapsulate(oiph, skb); 297 #endif 298 299 if (unlikely(err)) { 300 if (log_ecn_error) { 301 if (geneve_get_sk_family(gs) == AF_INET) 302 net_info_ratelimited("non-ECT from %pI4 " 303 "with TOS=%#x\n", 304 &((struct iphdr *)oiph)->saddr, 305 ((struct iphdr *)oiph)->tos); 306 #if IS_ENABLED(CONFIG_IPV6) 307 else 308 net_info_ratelimited("non-ECT from %pI6\n", 309 &((struct ipv6hdr *)oiph)->saddr); 310 #endif 311 } 312 if (err > 1) { 313 DEV_STATS_INC(geneve->dev, rx_frame_errors); 314 DEV_STATS_INC(geneve->dev, rx_errors); 315 goto drop; 316 } 317 } 318 319 len = skb->len; 320 err = gro_cells_receive(&geneve->gro_cells, skb); 321 if (likely(err == NET_RX_SUCCESS)) 322 dev_sw_netstats_rx_add(geneve->dev, len); 323 324 return; 325 drop: 326 /* Consume bad packet */ 327 kfree_skb(skb); 328 } 329 330 /* Setup stats when device is created */ 331 static int geneve_init(struct net_device *dev) 332 { 333 struct geneve_dev *geneve = netdev_priv(dev); 334 int err; 335 336 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 337 if (!dev->tstats) 338 return -ENOMEM; 339 340 err = gro_cells_init(&geneve->gro_cells, dev); 341 if (err) { 342 free_percpu(dev->tstats); 343 return err; 344 } 345 346 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 347 if (err) { 348 free_percpu(dev->tstats); 349 gro_cells_destroy(&geneve->gro_cells); 350 return err; 351 } 352 return 0; 353 } 354 355 static void geneve_uninit(struct net_device *dev) 356 { 357 struct geneve_dev *geneve = netdev_priv(dev); 358 359 dst_cache_destroy(&geneve->cfg.info.dst_cache); 360 gro_cells_destroy(&geneve->gro_cells); 361 free_percpu(dev->tstats); 362 } 363 364 /* Callback from net/ipv4/udp.c to receive packets */ 365 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 366 { 367 struct genevehdr *geneveh; 368 struct geneve_dev *geneve; 369 struct geneve_sock *gs; 370 __be16 inner_proto; 371 int opts_len; 372 373 /* Need UDP and Geneve header to be present */ 374 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 375 goto drop; 376 377 /* Return packets with reserved bits set */ 378 geneveh = geneve_hdr(skb); 379 if (unlikely(geneveh->ver != GENEVE_VER)) 380 goto drop; 381 382 gs = rcu_dereference_sk_user_data(sk); 383 if (!gs) 384 goto drop; 385 386 geneve = geneve_lookup_skb(gs, skb); 387 if (!geneve) 388 goto drop; 389 390 inner_proto = geneveh->proto_type; 391 392 if (unlikely((!geneve->cfg.inner_proto_inherit && 393 inner_proto != htons(ETH_P_TEB)))) { 394 DEV_STATS_INC(geneve->dev, rx_dropped); 395 goto drop; 396 } 397 398 opts_len = geneveh->opt_len * 4; 399 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto, 400 !net_eq(geneve->net, dev_net(geneve->dev)))) { 401 DEV_STATS_INC(geneve->dev, rx_dropped); 402 goto drop; 403 } 404 405 geneve_rx(geneve, gs, skb); 406 return 0; 407 408 drop: 409 /* Consume bad packet */ 410 kfree_skb(skb); 411 return 0; 412 } 413 414 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 415 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 416 { 417 struct genevehdr *geneveh; 418 struct geneve_sock *gs; 419 u8 zero_vni[3] = { 0 }; 420 u8 *vni = zero_vni; 421 422 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 423 return -EINVAL; 424 425 geneveh = geneve_hdr(skb); 426 if (geneveh->ver != GENEVE_VER) 427 return -EINVAL; 428 429 if (geneveh->proto_type != htons(ETH_P_TEB)) 430 return -EINVAL; 431 432 gs = rcu_dereference_sk_user_data(sk); 433 if (!gs) 434 return -ENOENT; 435 436 if (geneve_get_sk_family(gs) == AF_INET) { 437 struct iphdr *iph = ip_hdr(skb); 438 __be32 addr4 = 0; 439 440 if (!gs->collect_md) { 441 vni = geneve_hdr(skb)->vni; 442 addr4 = iph->daddr; 443 } 444 445 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 446 } 447 448 #if IS_ENABLED(CONFIG_IPV6) 449 if (geneve_get_sk_family(gs) == AF_INET6) { 450 struct ipv6hdr *ip6h = ipv6_hdr(skb); 451 struct in6_addr addr6; 452 453 memset(&addr6, 0, sizeof(struct in6_addr)); 454 455 if (!gs->collect_md) { 456 vni = geneve_hdr(skb)->vni; 457 addr6 = ip6h->daddr; 458 } 459 460 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 461 } 462 #endif 463 464 return -EPFNOSUPPORT; 465 } 466 467 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 468 __be16 port, bool ipv6_rx_csum) 469 { 470 struct socket *sock; 471 struct udp_port_cfg udp_conf; 472 int err; 473 474 memset(&udp_conf, 0, sizeof(udp_conf)); 475 476 if (ipv6) { 477 udp_conf.family = AF_INET6; 478 udp_conf.ipv6_v6only = 1; 479 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 480 } else { 481 udp_conf.family = AF_INET; 482 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 483 } 484 485 udp_conf.local_udp_port = port; 486 487 /* Open UDP socket */ 488 err = udp_sock_create(net, &udp_conf, &sock); 489 if (err < 0) 490 return ERR_PTR(err); 491 492 udp_allow_gso(sock->sk); 493 return sock; 494 } 495 496 static int geneve_hlen(struct genevehdr *gh) 497 { 498 return sizeof(*gh) + gh->opt_len * 4; 499 } 500 501 static struct sk_buff *geneve_gro_receive(struct sock *sk, 502 struct list_head *head, 503 struct sk_buff *skb) 504 { 505 struct sk_buff *pp = NULL; 506 struct sk_buff *p; 507 struct genevehdr *gh, *gh2; 508 unsigned int hlen, gh_len, off_gnv; 509 const struct packet_offload *ptype; 510 __be16 type; 511 int flush = 1; 512 513 off_gnv = skb_gro_offset(skb); 514 hlen = off_gnv + sizeof(*gh); 515 gh = skb_gro_header(skb, hlen, off_gnv); 516 if (unlikely(!gh)) 517 goto out; 518 519 if (gh->ver != GENEVE_VER || gh->oam) 520 goto out; 521 gh_len = geneve_hlen(gh); 522 523 hlen = off_gnv + gh_len; 524 if (skb_gro_header_hard(skb, hlen)) { 525 gh = skb_gro_header_slow(skb, hlen, off_gnv); 526 if (unlikely(!gh)) 527 goto out; 528 } 529 530 list_for_each_entry(p, head, list) { 531 if (!NAPI_GRO_CB(p)->same_flow) 532 continue; 533 534 gh2 = (struct genevehdr *)(p->data + off_gnv); 535 if (gh->opt_len != gh2->opt_len || 536 memcmp(gh, gh2, gh_len)) { 537 NAPI_GRO_CB(p)->same_flow = 0; 538 continue; 539 } 540 } 541 542 skb_gro_pull(skb, gh_len); 543 skb_gro_postpull_rcsum(skb, gh, gh_len); 544 type = gh->proto_type; 545 if (likely(type == htons(ETH_P_TEB))) 546 return call_gro_receive(eth_gro_receive, head, skb); 547 548 ptype = gro_find_receive_by_type(type); 549 if (!ptype) 550 goto out; 551 552 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 553 flush = 0; 554 555 out: 556 skb_gro_flush_final(skb, pp, flush); 557 558 return pp; 559 } 560 561 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 562 int nhoff) 563 { 564 struct genevehdr *gh; 565 struct packet_offload *ptype; 566 __be16 type; 567 int gh_len; 568 int err = -ENOSYS; 569 570 gh = (struct genevehdr *)(skb->data + nhoff); 571 gh_len = geneve_hlen(gh); 572 type = gh->proto_type; 573 574 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */ 575 if (likely(type == htons(ETH_P_TEB))) 576 return eth_gro_complete(skb, nhoff + gh_len); 577 578 ptype = gro_find_complete_by_type(type); 579 if (ptype) 580 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 581 582 skb_set_inner_mac_header(skb, nhoff + gh_len); 583 584 return err; 585 } 586 587 /* Create new listen socket if needed */ 588 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 589 bool ipv6, bool ipv6_rx_csum) 590 { 591 struct geneve_net *gn = net_generic(net, geneve_net_id); 592 struct geneve_sock *gs; 593 struct socket *sock; 594 struct udp_tunnel_sock_cfg tunnel_cfg; 595 int h; 596 597 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 598 if (!gs) 599 return ERR_PTR(-ENOMEM); 600 601 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 602 if (IS_ERR(sock)) { 603 kfree(gs); 604 return ERR_CAST(sock); 605 } 606 607 gs->sock = sock; 608 gs->refcnt = 1; 609 for (h = 0; h < VNI_HASH_SIZE; ++h) 610 INIT_HLIST_HEAD(&gs->vni_list[h]); 611 612 /* Initialize the geneve udp offloads structure */ 613 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 614 615 /* Mark socket as an encapsulation socket */ 616 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 617 tunnel_cfg.sk_user_data = gs; 618 tunnel_cfg.encap_type = 1; 619 tunnel_cfg.gro_receive = geneve_gro_receive; 620 tunnel_cfg.gro_complete = geneve_gro_complete; 621 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 622 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 623 tunnel_cfg.encap_destroy = NULL; 624 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 625 list_add(&gs->list, &gn->sock_list); 626 return gs; 627 } 628 629 static void __geneve_sock_release(struct geneve_sock *gs) 630 { 631 if (!gs || --gs->refcnt) 632 return; 633 634 list_del(&gs->list); 635 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 636 udp_tunnel_sock_release(gs->sock); 637 kfree_rcu(gs, rcu); 638 } 639 640 static void geneve_sock_release(struct geneve_dev *geneve) 641 { 642 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 643 #if IS_ENABLED(CONFIG_IPV6) 644 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 645 646 rcu_assign_pointer(geneve->sock6, NULL); 647 #endif 648 649 rcu_assign_pointer(geneve->sock4, NULL); 650 synchronize_net(); 651 652 __geneve_sock_release(gs4); 653 #if IS_ENABLED(CONFIG_IPV6) 654 __geneve_sock_release(gs6); 655 #endif 656 } 657 658 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 659 sa_family_t family, 660 __be16 dst_port) 661 { 662 struct geneve_sock *gs; 663 664 list_for_each_entry(gs, &gn->sock_list, list) { 665 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 666 geneve_get_sk_family(gs) == family) { 667 return gs; 668 } 669 } 670 return NULL; 671 } 672 673 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 674 { 675 struct net *net = geneve->net; 676 struct geneve_net *gn = net_generic(net, geneve_net_id); 677 struct geneve_dev_node *node; 678 struct geneve_sock *gs; 679 __u8 vni[3]; 680 __u32 hash; 681 682 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 683 if (gs) { 684 gs->refcnt++; 685 goto out; 686 } 687 688 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 689 geneve->cfg.use_udp6_rx_checksums); 690 if (IS_ERR(gs)) 691 return PTR_ERR(gs); 692 693 out: 694 gs->collect_md = geneve->cfg.collect_md; 695 #if IS_ENABLED(CONFIG_IPV6) 696 if (ipv6) { 697 rcu_assign_pointer(geneve->sock6, gs); 698 node = &geneve->hlist6; 699 } else 700 #endif 701 { 702 rcu_assign_pointer(geneve->sock4, gs); 703 node = &geneve->hlist4; 704 } 705 node->geneve = geneve; 706 707 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 708 hash = geneve_net_vni_hash(vni); 709 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 710 return 0; 711 } 712 713 static int geneve_open(struct net_device *dev) 714 { 715 struct geneve_dev *geneve = netdev_priv(dev); 716 bool metadata = geneve->cfg.collect_md; 717 bool ipv4, ipv6; 718 int ret = 0; 719 720 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 721 ipv4 = !ipv6 || metadata; 722 #if IS_ENABLED(CONFIG_IPV6) 723 if (ipv6) { 724 ret = geneve_sock_add(geneve, true); 725 if (ret < 0 && ret != -EAFNOSUPPORT) 726 ipv4 = false; 727 } 728 #endif 729 if (ipv4) 730 ret = geneve_sock_add(geneve, false); 731 if (ret < 0) 732 geneve_sock_release(geneve); 733 734 return ret; 735 } 736 737 static int geneve_stop(struct net_device *dev) 738 { 739 struct geneve_dev *geneve = netdev_priv(dev); 740 741 hlist_del_init_rcu(&geneve->hlist4.hlist); 742 #if IS_ENABLED(CONFIG_IPV6) 743 hlist_del_init_rcu(&geneve->hlist6.hlist); 744 #endif 745 geneve_sock_release(geneve); 746 return 0; 747 } 748 749 static void geneve_build_header(struct genevehdr *geneveh, 750 const struct ip_tunnel_info *info, 751 __be16 inner_proto) 752 { 753 geneveh->ver = GENEVE_VER; 754 geneveh->opt_len = info->options_len / 4; 755 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 756 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 757 geneveh->rsvd1 = 0; 758 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 759 geneveh->proto_type = inner_proto; 760 geneveh->rsvd2 = 0; 761 762 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 763 ip_tunnel_info_opts_get(geneveh->options, info); 764 } 765 766 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 767 const struct ip_tunnel_info *info, 768 bool xnet, int ip_hdr_len, 769 bool inner_proto_inherit) 770 { 771 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 772 struct genevehdr *gnvh; 773 __be16 inner_proto; 774 int min_headroom; 775 int err; 776 777 skb_reset_mac_header(skb); 778 skb_scrub_packet(skb, xnet); 779 780 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 781 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 782 err = skb_cow_head(skb, min_headroom); 783 if (unlikely(err)) 784 goto free_dst; 785 786 err = udp_tunnel_handle_offloads(skb, udp_sum); 787 if (err) 788 goto free_dst; 789 790 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 791 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB); 792 geneve_build_header(gnvh, info, inner_proto); 793 skb_set_inner_protocol(skb, inner_proto); 794 return 0; 795 796 free_dst: 797 dst_release(dst); 798 return err; 799 } 800 801 static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev, 802 const struct ip_tunnel_info *info, 803 bool *use_cache) 804 { 805 struct geneve_dev *geneve = netdev_priv(dev); 806 u8 dsfield; 807 808 dsfield = info->key.tos; 809 if (dsfield == 1 && !geneve->cfg.collect_md) { 810 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 811 *use_cache = false; 812 } 813 814 return dsfield; 815 } 816 817 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 818 struct geneve_dev *geneve, 819 const struct ip_tunnel_info *info) 820 { 821 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 822 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 823 const struct ip_tunnel_key *key = &info->key; 824 struct rtable *rt; 825 bool use_cache; 826 __u8 tos, ttl; 827 __be16 df = 0; 828 __be32 saddr; 829 __be16 sport; 830 int err; 831 832 if (!pskb_inet_may_pull(skb)) 833 return -EINVAL; 834 835 if (!gs4) 836 return -EIO; 837 838 use_cache = ip_tunnel_dst_cache_usable(skb, info); 839 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 840 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 841 842 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 843 &info->key, 844 sport, geneve->cfg.info.key.tp_dst, tos, 845 use_cache ? 846 (struct dst_cache *)&info->dst_cache : NULL); 847 if (IS_ERR(rt)) 848 return PTR_ERR(rt); 849 850 err = skb_tunnel_check_pmtu(skb, &rt->dst, 851 GENEVE_IPV4_HLEN + info->options_len, 852 netif_is_any_bridge_port(dev)); 853 if (err < 0) { 854 dst_release(&rt->dst); 855 return err; 856 } else if (err) { 857 struct ip_tunnel_info *info; 858 859 info = skb_tunnel_info(skb); 860 if (info) { 861 struct ip_tunnel_info *unclone; 862 863 unclone = skb_tunnel_info_unclone(skb); 864 if (unlikely(!unclone)) { 865 dst_release(&rt->dst); 866 return -ENOMEM; 867 } 868 869 unclone->key.u.ipv4.dst = saddr; 870 unclone->key.u.ipv4.src = info->key.u.ipv4.dst; 871 } 872 873 if (!pskb_may_pull(skb, ETH_HLEN)) { 874 dst_release(&rt->dst); 875 return -EINVAL; 876 } 877 878 skb->protocol = eth_type_trans(skb, geneve->dev); 879 __netif_rx(skb); 880 dst_release(&rt->dst); 881 return -EMSGSIZE; 882 } 883 884 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb); 885 if (geneve->cfg.collect_md) { 886 ttl = key->ttl; 887 888 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 889 } else { 890 if (geneve->cfg.ttl_inherit) 891 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 892 else 893 ttl = key->ttl; 894 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 895 896 if (geneve->cfg.df == GENEVE_DF_SET) { 897 df = htons(IP_DF); 898 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 899 struct ethhdr *eth = eth_hdr(skb); 900 901 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 902 df = htons(IP_DF); 903 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 904 struct iphdr *iph = ip_hdr(skb); 905 906 if (iph->frag_off & htons(IP_DF)) 907 df = htons(IP_DF); 908 } 909 } 910 } 911 912 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr), 913 geneve->cfg.inner_proto_inherit); 914 if (unlikely(err)) 915 return err; 916 917 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst, 918 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 919 !net_eq(geneve->net, dev_net(geneve->dev)), 920 !(info->key.tun_flags & TUNNEL_CSUM)); 921 return 0; 922 } 923 924 #if IS_ENABLED(CONFIG_IPV6) 925 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 926 struct geneve_dev *geneve, 927 const struct ip_tunnel_info *info) 928 { 929 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 930 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 931 const struct ip_tunnel_key *key = &info->key; 932 struct dst_entry *dst = NULL; 933 struct in6_addr saddr; 934 bool use_cache; 935 __u8 prio, ttl; 936 __be16 sport; 937 int err; 938 939 if (!pskb_inet_may_pull(skb)) 940 return -EINVAL; 941 942 if (!gs6) 943 return -EIO; 944 945 use_cache = ip_tunnel_dst_cache_usable(skb, info); 946 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 947 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 948 949 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 950 &saddr, key, sport, 951 geneve->cfg.info.key.tp_dst, prio, 952 use_cache ? 953 (struct dst_cache *)&info->dst_cache : NULL); 954 if (IS_ERR(dst)) 955 return PTR_ERR(dst); 956 957 err = skb_tunnel_check_pmtu(skb, dst, 958 GENEVE_IPV6_HLEN + info->options_len, 959 netif_is_any_bridge_port(dev)); 960 if (err < 0) { 961 dst_release(dst); 962 return err; 963 } else if (err) { 964 struct ip_tunnel_info *info = skb_tunnel_info(skb); 965 966 if (info) { 967 struct ip_tunnel_info *unclone; 968 969 unclone = skb_tunnel_info_unclone(skb); 970 if (unlikely(!unclone)) { 971 dst_release(dst); 972 return -ENOMEM; 973 } 974 975 unclone->key.u.ipv6.dst = saddr; 976 unclone->key.u.ipv6.src = info->key.u.ipv6.dst; 977 } 978 979 if (!pskb_may_pull(skb, ETH_HLEN)) { 980 dst_release(dst); 981 return -EINVAL; 982 } 983 984 skb->protocol = eth_type_trans(skb, geneve->dev); 985 __netif_rx(skb); 986 dst_release(dst); 987 return -EMSGSIZE; 988 } 989 990 prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb); 991 if (geneve->cfg.collect_md) { 992 ttl = key->ttl; 993 } else { 994 if (geneve->cfg.ttl_inherit) 995 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 996 else 997 ttl = key->ttl; 998 ttl = ttl ? : ip6_dst_hoplimit(dst); 999 } 1000 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr), 1001 geneve->cfg.inner_proto_inherit); 1002 if (unlikely(err)) 1003 return err; 1004 1005 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1006 &saddr, &key->u.ipv6.dst, prio, ttl, 1007 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1008 !(info->key.tun_flags & TUNNEL_CSUM)); 1009 return 0; 1010 } 1011 #endif 1012 1013 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1014 { 1015 struct geneve_dev *geneve = netdev_priv(dev); 1016 struct ip_tunnel_info *info = NULL; 1017 int err; 1018 1019 if (geneve->cfg.collect_md) { 1020 info = skb_tunnel_info(skb); 1021 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1022 netdev_dbg(dev, "no tunnel metadata\n"); 1023 dev_kfree_skb(skb); 1024 DEV_STATS_INC(dev, tx_dropped); 1025 return NETDEV_TX_OK; 1026 } 1027 } else { 1028 info = &geneve->cfg.info; 1029 } 1030 1031 rcu_read_lock(); 1032 #if IS_ENABLED(CONFIG_IPV6) 1033 if (info->mode & IP_TUNNEL_INFO_IPV6) 1034 err = geneve6_xmit_skb(skb, dev, geneve, info); 1035 else 1036 #endif 1037 err = geneve_xmit_skb(skb, dev, geneve, info); 1038 rcu_read_unlock(); 1039 1040 if (likely(!err)) 1041 return NETDEV_TX_OK; 1042 1043 if (err != -EMSGSIZE) 1044 dev_kfree_skb(skb); 1045 1046 if (err == -ELOOP) 1047 DEV_STATS_INC(dev, collisions); 1048 else if (err == -ENETUNREACH) 1049 DEV_STATS_INC(dev, tx_carrier_errors); 1050 1051 DEV_STATS_INC(dev, tx_errors); 1052 return NETDEV_TX_OK; 1053 } 1054 1055 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1056 { 1057 if (new_mtu > dev->max_mtu) 1058 new_mtu = dev->max_mtu; 1059 else if (new_mtu < dev->min_mtu) 1060 new_mtu = dev->min_mtu; 1061 1062 dev->mtu = new_mtu; 1063 return 0; 1064 } 1065 1066 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1067 { 1068 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1069 struct geneve_dev *geneve = netdev_priv(dev); 1070 __be16 sport; 1071 1072 if (ip_tunnel_info_af(info) == AF_INET) { 1073 struct rtable *rt; 1074 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1075 bool use_cache; 1076 __be32 saddr; 1077 u8 tos; 1078 1079 if (!gs4) 1080 return -EIO; 1081 1082 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1083 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 1084 sport = udp_flow_src_port(geneve->net, skb, 1085 1, USHRT_MAX, true); 1086 1087 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 1088 &info->key, 1089 sport, geneve->cfg.info.key.tp_dst, 1090 tos, 1091 use_cache ? &info->dst_cache : NULL); 1092 if (IS_ERR(rt)) 1093 return PTR_ERR(rt); 1094 1095 ip_rt_put(rt); 1096 info->key.u.ipv4.src = saddr; 1097 #if IS_ENABLED(CONFIG_IPV6) 1098 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1099 struct dst_entry *dst; 1100 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1101 struct in6_addr saddr; 1102 bool use_cache; 1103 u8 prio; 1104 1105 if (!gs6) 1106 return -EIO; 1107 1108 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1109 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 1110 sport = udp_flow_src_port(geneve->net, skb, 1111 1, USHRT_MAX, true); 1112 1113 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 1114 &saddr, &info->key, sport, 1115 geneve->cfg.info.key.tp_dst, prio, 1116 use_cache ? &info->dst_cache : NULL); 1117 if (IS_ERR(dst)) 1118 return PTR_ERR(dst); 1119 1120 dst_release(dst); 1121 info->key.u.ipv6.src = saddr; 1122 #endif 1123 } else { 1124 return -EINVAL; 1125 } 1126 1127 info->key.tp_src = sport; 1128 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1129 return 0; 1130 } 1131 1132 static const struct net_device_ops geneve_netdev_ops = { 1133 .ndo_init = geneve_init, 1134 .ndo_uninit = geneve_uninit, 1135 .ndo_open = geneve_open, 1136 .ndo_stop = geneve_stop, 1137 .ndo_start_xmit = geneve_xmit, 1138 .ndo_get_stats64 = dev_get_tstats64, 1139 .ndo_change_mtu = geneve_change_mtu, 1140 .ndo_validate_addr = eth_validate_addr, 1141 .ndo_set_mac_address = eth_mac_addr, 1142 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1143 }; 1144 1145 static void geneve_get_drvinfo(struct net_device *dev, 1146 struct ethtool_drvinfo *drvinfo) 1147 { 1148 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1149 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1150 } 1151 1152 static const struct ethtool_ops geneve_ethtool_ops = { 1153 .get_drvinfo = geneve_get_drvinfo, 1154 .get_link = ethtool_op_get_link, 1155 }; 1156 1157 /* Info for udev, that this is a virtual tunnel endpoint */ 1158 static struct device_type geneve_type = { 1159 .name = "geneve", 1160 }; 1161 1162 /* Calls the ndo_udp_tunnel_add of the caller in order to 1163 * supply the listening GENEVE udp ports. Callers are expected 1164 * to implement the ndo_udp_tunnel_add. 1165 */ 1166 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1167 { 1168 struct net *net = dev_net(dev); 1169 struct geneve_net *gn = net_generic(net, geneve_net_id); 1170 struct geneve_sock *gs; 1171 1172 rcu_read_lock(); 1173 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1174 if (push) { 1175 udp_tunnel_push_rx_port(dev, gs->sock, 1176 UDP_TUNNEL_TYPE_GENEVE); 1177 } else { 1178 udp_tunnel_drop_rx_port(dev, gs->sock, 1179 UDP_TUNNEL_TYPE_GENEVE); 1180 } 1181 } 1182 rcu_read_unlock(); 1183 } 1184 1185 /* Initialize the device structure. */ 1186 static void geneve_setup(struct net_device *dev) 1187 { 1188 ether_setup(dev); 1189 1190 dev->netdev_ops = &geneve_netdev_ops; 1191 dev->ethtool_ops = &geneve_ethtool_ops; 1192 dev->needs_free_netdev = true; 1193 1194 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1195 1196 dev->features |= NETIF_F_LLTX; 1197 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1198 dev->features |= NETIF_F_RXCSUM; 1199 dev->features |= NETIF_F_GSO_SOFTWARE; 1200 1201 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1202 dev->hw_features |= NETIF_F_RXCSUM; 1203 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1204 1205 /* MTU range: 68 - (something less than 65535) */ 1206 dev->min_mtu = ETH_MIN_MTU; 1207 /* The max_mtu calculation does not take account of GENEVE 1208 * options, to avoid excluding potentially valid 1209 * configurations. This will be further reduced by IPvX hdr size. 1210 */ 1211 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1212 1213 netif_keep_dst(dev); 1214 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1215 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1216 eth_hw_addr_random(dev); 1217 } 1218 1219 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1220 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, 1221 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1222 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1223 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1224 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1225 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1226 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1227 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1228 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1229 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1230 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1231 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1232 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1233 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1234 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, 1235 }; 1236 1237 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1238 struct netlink_ext_ack *extack) 1239 { 1240 if (tb[IFLA_ADDRESS]) { 1241 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1242 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1243 "Provided link layer address is not Ethernet"); 1244 return -EINVAL; 1245 } 1246 1247 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1248 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1249 "Provided Ethernet address is not unicast"); 1250 return -EADDRNOTAVAIL; 1251 } 1252 } 1253 1254 if (!data) { 1255 NL_SET_ERR_MSG(extack, 1256 "Not enough attributes provided to perform the operation"); 1257 return -EINVAL; 1258 } 1259 1260 if (data[IFLA_GENEVE_ID]) { 1261 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1262 1263 if (vni >= GENEVE_N_VID) { 1264 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1265 "Geneve ID must be lower than 16777216"); 1266 return -ERANGE; 1267 } 1268 } 1269 1270 if (data[IFLA_GENEVE_DF]) { 1271 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1272 1273 if (df < 0 || df > GENEVE_DF_MAX) { 1274 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1275 "Invalid DF attribute"); 1276 return -EINVAL; 1277 } 1278 } 1279 1280 return 0; 1281 } 1282 1283 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1284 const struct ip_tunnel_info *info, 1285 bool *tun_on_same_port, 1286 bool *tun_collect_md) 1287 { 1288 struct geneve_dev *geneve, *t = NULL; 1289 1290 *tun_on_same_port = false; 1291 *tun_collect_md = false; 1292 list_for_each_entry(geneve, &gn->geneve_list, next) { 1293 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1294 *tun_collect_md = geneve->cfg.collect_md; 1295 *tun_on_same_port = true; 1296 } 1297 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1298 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1299 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1300 t = geneve; 1301 } 1302 return t; 1303 } 1304 1305 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1306 { 1307 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1308 info->key.ttl || info->key.label || info->key.tp_src || 1309 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1310 } 1311 1312 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1313 struct ip_tunnel_info *b) 1314 { 1315 if (ip_tunnel_info_af(a) == AF_INET) 1316 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1317 else 1318 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1319 } 1320 1321 static int geneve_configure(struct net *net, struct net_device *dev, 1322 struct netlink_ext_ack *extack, 1323 const struct geneve_config *cfg) 1324 { 1325 struct geneve_net *gn = net_generic(net, geneve_net_id); 1326 struct geneve_dev *t, *geneve = netdev_priv(dev); 1327 const struct ip_tunnel_info *info = &cfg->info; 1328 bool tun_collect_md, tun_on_same_port; 1329 int err, encap_len; 1330 1331 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1332 NL_SET_ERR_MSG(extack, 1333 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1334 return -EINVAL; 1335 } 1336 1337 geneve->net = net; 1338 geneve->dev = dev; 1339 1340 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1341 if (t) 1342 return -EBUSY; 1343 1344 /* make enough headroom for basic scenario */ 1345 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1346 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1347 encap_len += sizeof(struct iphdr); 1348 dev->max_mtu -= sizeof(struct iphdr); 1349 } else { 1350 encap_len += sizeof(struct ipv6hdr); 1351 dev->max_mtu -= sizeof(struct ipv6hdr); 1352 } 1353 dev->needed_headroom = encap_len + ETH_HLEN; 1354 1355 if (cfg->collect_md) { 1356 if (tun_on_same_port) { 1357 NL_SET_ERR_MSG(extack, 1358 "There can be only one externally controlled device on a destination port"); 1359 return -EPERM; 1360 } 1361 } else { 1362 if (tun_collect_md) { 1363 NL_SET_ERR_MSG(extack, 1364 "There already exists an externally controlled device on this destination port"); 1365 return -EPERM; 1366 } 1367 } 1368 1369 dst_cache_reset(&geneve->cfg.info.dst_cache); 1370 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1371 1372 if (geneve->cfg.inner_proto_inherit) { 1373 dev->header_ops = NULL; 1374 dev->type = ARPHRD_NONE; 1375 dev->hard_header_len = 0; 1376 dev->addr_len = 0; 1377 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1378 } 1379 1380 err = register_netdevice(dev); 1381 if (err) 1382 return err; 1383 1384 list_add(&geneve->next, &gn->geneve_list); 1385 return 0; 1386 } 1387 1388 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1389 { 1390 memset(info, 0, sizeof(*info)); 1391 info->key.tp_dst = htons(dst_port); 1392 } 1393 1394 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1395 struct netlink_ext_ack *extack, 1396 struct geneve_config *cfg, bool changelink) 1397 { 1398 struct ip_tunnel_info *info = &cfg->info; 1399 int attrtype; 1400 1401 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1402 NL_SET_ERR_MSG(extack, 1403 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1404 return -EINVAL; 1405 } 1406 1407 if (data[IFLA_GENEVE_REMOTE]) { 1408 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1409 attrtype = IFLA_GENEVE_REMOTE; 1410 goto change_notsup; 1411 } 1412 1413 info->key.u.ipv4.dst = 1414 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1415 1416 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1417 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1418 "Remote IPv4 address cannot be Multicast"); 1419 return -EINVAL; 1420 } 1421 } 1422 1423 if (data[IFLA_GENEVE_REMOTE6]) { 1424 #if IS_ENABLED(CONFIG_IPV6) 1425 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1426 attrtype = IFLA_GENEVE_REMOTE6; 1427 goto change_notsup; 1428 } 1429 1430 info->mode = IP_TUNNEL_INFO_IPV6; 1431 info->key.u.ipv6.dst = 1432 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1433 1434 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1435 IPV6_ADDR_LINKLOCAL) { 1436 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1437 "Remote IPv6 address cannot be link-local"); 1438 return -EINVAL; 1439 } 1440 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1441 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1442 "Remote IPv6 address cannot be Multicast"); 1443 return -EINVAL; 1444 } 1445 info->key.tun_flags |= TUNNEL_CSUM; 1446 cfg->use_udp6_rx_checksums = true; 1447 #else 1448 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1449 "IPv6 support not enabled in the kernel"); 1450 return -EPFNOSUPPORT; 1451 #endif 1452 } 1453 1454 if (data[IFLA_GENEVE_ID]) { 1455 __u32 vni; 1456 __u8 tvni[3]; 1457 __be64 tunid; 1458 1459 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1460 tvni[0] = (vni & 0x00ff0000) >> 16; 1461 tvni[1] = (vni & 0x0000ff00) >> 8; 1462 tvni[2] = vni & 0x000000ff; 1463 1464 tunid = vni_to_tunnel_id(tvni); 1465 if (changelink && (tunid != info->key.tun_id)) { 1466 attrtype = IFLA_GENEVE_ID; 1467 goto change_notsup; 1468 } 1469 info->key.tun_id = tunid; 1470 } 1471 1472 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1473 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1474 cfg->ttl_inherit = true; 1475 else 1476 cfg->ttl_inherit = false; 1477 } else if (data[IFLA_GENEVE_TTL]) { 1478 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1479 cfg->ttl_inherit = false; 1480 } 1481 1482 if (data[IFLA_GENEVE_TOS]) 1483 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1484 1485 if (data[IFLA_GENEVE_DF]) 1486 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1487 1488 if (data[IFLA_GENEVE_LABEL]) { 1489 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1490 IPV6_FLOWLABEL_MASK; 1491 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1492 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1493 "Label attribute only applies for IPv6 Geneve devices"); 1494 return -EINVAL; 1495 } 1496 } 1497 1498 if (data[IFLA_GENEVE_PORT]) { 1499 if (changelink) { 1500 attrtype = IFLA_GENEVE_PORT; 1501 goto change_notsup; 1502 } 1503 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1504 } 1505 1506 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1507 if (changelink) { 1508 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1509 goto change_notsup; 1510 } 1511 cfg->collect_md = true; 1512 } 1513 1514 if (data[IFLA_GENEVE_UDP_CSUM]) { 1515 if (changelink) { 1516 attrtype = IFLA_GENEVE_UDP_CSUM; 1517 goto change_notsup; 1518 } 1519 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1520 info->key.tun_flags |= TUNNEL_CSUM; 1521 } 1522 1523 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1524 #if IS_ENABLED(CONFIG_IPV6) 1525 if (changelink) { 1526 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1527 goto change_notsup; 1528 } 1529 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1530 info->key.tun_flags &= ~TUNNEL_CSUM; 1531 #else 1532 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1533 "IPv6 support not enabled in the kernel"); 1534 return -EPFNOSUPPORT; 1535 #endif 1536 } 1537 1538 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1539 #if IS_ENABLED(CONFIG_IPV6) 1540 if (changelink) { 1541 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1542 goto change_notsup; 1543 } 1544 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1545 cfg->use_udp6_rx_checksums = false; 1546 #else 1547 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1548 "IPv6 support not enabled in the kernel"); 1549 return -EPFNOSUPPORT; 1550 #endif 1551 } 1552 1553 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { 1554 if (changelink) { 1555 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; 1556 goto change_notsup; 1557 } 1558 cfg->inner_proto_inherit = true; 1559 } 1560 1561 return 0; 1562 change_notsup: 1563 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1564 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported"); 1565 return -EOPNOTSUPP; 1566 } 1567 1568 static void geneve_link_config(struct net_device *dev, 1569 struct ip_tunnel_info *info, struct nlattr *tb[]) 1570 { 1571 struct geneve_dev *geneve = netdev_priv(dev); 1572 int ldev_mtu = 0; 1573 1574 if (tb[IFLA_MTU]) { 1575 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1576 return; 1577 } 1578 1579 switch (ip_tunnel_info_af(info)) { 1580 case AF_INET: { 1581 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1582 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1583 1584 if (!IS_ERR(rt) && rt->dst.dev) { 1585 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1586 ip_rt_put(rt); 1587 } 1588 break; 1589 } 1590 #if IS_ENABLED(CONFIG_IPV6) 1591 case AF_INET6: { 1592 struct rt6_info *rt; 1593 1594 if (!__in6_dev_get(dev)) 1595 break; 1596 1597 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1598 NULL, 0); 1599 1600 if (rt && rt->dst.dev) 1601 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1602 ip6_rt_put(rt); 1603 break; 1604 } 1605 #endif 1606 } 1607 1608 if (ldev_mtu <= 0) 1609 return; 1610 1611 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1612 } 1613 1614 static int geneve_newlink(struct net *net, struct net_device *dev, 1615 struct nlattr *tb[], struct nlattr *data[], 1616 struct netlink_ext_ack *extack) 1617 { 1618 struct geneve_config cfg = { 1619 .df = GENEVE_DF_UNSET, 1620 .use_udp6_rx_checksums = false, 1621 .ttl_inherit = false, 1622 .collect_md = false, 1623 }; 1624 int err; 1625 1626 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1627 err = geneve_nl2info(tb, data, extack, &cfg, false); 1628 if (err) 1629 return err; 1630 1631 err = geneve_configure(net, dev, extack, &cfg); 1632 if (err) 1633 return err; 1634 1635 geneve_link_config(dev, &cfg.info, tb); 1636 1637 return 0; 1638 } 1639 1640 /* Quiesces the geneve device data path for both TX and RX. 1641 * 1642 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1643 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1644 * to complete for the existing set of in-flight packets to be transmitted, 1645 * then we would have quiesced the transmit data path. All the future packets 1646 * will get dropped until we unquiesce the data path. 1647 * 1648 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1649 * if we set that to NULL under RCU and wait for synchronize_net() to 1650 * complete, then we would have quiesced the receive data path. 1651 */ 1652 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1653 struct geneve_sock **gs6) 1654 { 1655 *gs4 = rtnl_dereference(geneve->sock4); 1656 rcu_assign_pointer(geneve->sock4, NULL); 1657 if (*gs4) 1658 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1659 #if IS_ENABLED(CONFIG_IPV6) 1660 *gs6 = rtnl_dereference(geneve->sock6); 1661 rcu_assign_pointer(geneve->sock6, NULL); 1662 if (*gs6) 1663 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1664 #else 1665 *gs6 = NULL; 1666 #endif 1667 synchronize_net(); 1668 } 1669 1670 /* Resumes the geneve device data path for both TX and RX. */ 1671 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1672 struct geneve_sock __maybe_unused *gs6) 1673 { 1674 rcu_assign_pointer(geneve->sock4, gs4); 1675 if (gs4) 1676 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1677 #if IS_ENABLED(CONFIG_IPV6) 1678 rcu_assign_pointer(geneve->sock6, gs6); 1679 if (gs6) 1680 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1681 #endif 1682 synchronize_net(); 1683 } 1684 1685 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1686 struct nlattr *data[], 1687 struct netlink_ext_ack *extack) 1688 { 1689 struct geneve_dev *geneve = netdev_priv(dev); 1690 struct geneve_sock *gs4, *gs6; 1691 struct geneve_config cfg; 1692 int err; 1693 1694 /* If the geneve device is configured for metadata (or externally 1695 * controlled, for example, OVS), then nothing can be changed. 1696 */ 1697 if (geneve->cfg.collect_md) 1698 return -EOPNOTSUPP; 1699 1700 /* Start with the existing info. */ 1701 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1702 err = geneve_nl2info(tb, data, extack, &cfg, true); 1703 if (err) 1704 return err; 1705 1706 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1707 dst_cache_reset(&cfg.info.dst_cache); 1708 geneve_link_config(dev, &cfg.info, tb); 1709 } 1710 1711 geneve_quiesce(geneve, &gs4, &gs6); 1712 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1713 geneve_unquiesce(geneve, gs4, gs6); 1714 1715 return 0; 1716 } 1717 1718 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1719 { 1720 struct geneve_dev *geneve = netdev_priv(dev); 1721 1722 list_del(&geneve->next); 1723 unregister_netdevice_queue(dev, head); 1724 } 1725 1726 static size_t geneve_get_size(const struct net_device *dev) 1727 { 1728 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1729 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1730 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1731 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1732 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1733 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1734 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1735 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1736 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1737 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1738 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1739 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1740 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ 1741 0; 1742 } 1743 1744 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1745 { 1746 struct geneve_dev *geneve = netdev_priv(dev); 1747 struct ip_tunnel_info *info = &geneve->cfg.info; 1748 bool ttl_inherit = geneve->cfg.ttl_inherit; 1749 bool metadata = geneve->cfg.collect_md; 1750 __u8 tmp_vni[3]; 1751 __u32 vni; 1752 1753 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1754 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1755 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1756 goto nla_put_failure; 1757 1758 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1759 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1760 info->key.u.ipv4.dst)) 1761 goto nla_put_failure; 1762 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1763 !!(info->key.tun_flags & TUNNEL_CSUM))) 1764 goto nla_put_failure; 1765 1766 #if IS_ENABLED(CONFIG_IPV6) 1767 } else if (!metadata) { 1768 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1769 &info->key.u.ipv6.dst)) 1770 goto nla_put_failure; 1771 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1772 !(info->key.tun_flags & TUNNEL_CSUM))) 1773 goto nla_put_failure; 1774 #endif 1775 } 1776 1777 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1778 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1779 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1780 goto nla_put_failure; 1781 1782 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1783 goto nla_put_failure; 1784 1785 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1786 goto nla_put_failure; 1787 1788 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1789 goto nla_put_failure; 1790 1791 #if IS_ENABLED(CONFIG_IPV6) 1792 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1793 !geneve->cfg.use_udp6_rx_checksums)) 1794 goto nla_put_failure; 1795 #endif 1796 1797 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1798 goto nla_put_failure; 1799 1800 if (geneve->cfg.inner_proto_inherit && 1801 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) 1802 goto nla_put_failure; 1803 1804 return 0; 1805 1806 nla_put_failure: 1807 return -EMSGSIZE; 1808 } 1809 1810 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1811 .kind = "geneve", 1812 .maxtype = IFLA_GENEVE_MAX, 1813 .policy = geneve_policy, 1814 .priv_size = sizeof(struct geneve_dev), 1815 .setup = geneve_setup, 1816 .validate = geneve_validate, 1817 .newlink = geneve_newlink, 1818 .changelink = geneve_changelink, 1819 .dellink = geneve_dellink, 1820 .get_size = geneve_get_size, 1821 .fill_info = geneve_fill_info, 1822 }; 1823 1824 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1825 u8 name_assign_type, u16 dst_port) 1826 { 1827 struct nlattr *tb[IFLA_MAX + 1]; 1828 struct net_device *dev; 1829 LIST_HEAD(list_kill); 1830 int err; 1831 struct geneve_config cfg = { 1832 .df = GENEVE_DF_UNSET, 1833 .use_udp6_rx_checksums = true, 1834 .ttl_inherit = false, 1835 .collect_md = true, 1836 }; 1837 1838 memset(tb, 0, sizeof(tb)); 1839 dev = rtnl_create_link(net, name, name_assign_type, 1840 &geneve_link_ops, tb, NULL); 1841 if (IS_ERR(dev)) 1842 return dev; 1843 1844 init_tnl_info(&cfg.info, dst_port); 1845 err = geneve_configure(net, dev, NULL, &cfg); 1846 if (err) { 1847 free_netdev(dev); 1848 return ERR_PTR(err); 1849 } 1850 1851 /* openvswitch users expect packet sizes to be unrestricted, 1852 * so set the largest MTU we can. 1853 */ 1854 err = geneve_change_mtu(dev, IP_MAX_MTU); 1855 if (err) 1856 goto err; 1857 1858 err = rtnl_configure_link(dev, NULL, 0, NULL); 1859 if (err < 0) 1860 goto err; 1861 1862 return dev; 1863 err: 1864 geneve_dellink(dev, &list_kill); 1865 unregister_netdevice_many(&list_kill); 1866 return ERR_PTR(err); 1867 } 1868 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1869 1870 static int geneve_netdevice_event(struct notifier_block *unused, 1871 unsigned long event, void *ptr) 1872 { 1873 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1874 1875 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1876 geneve_offload_rx_ports(dev, true); 1877 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 1878 geneve_offload_rx_ports(dev, false); 1879 1880 return NOTIFY_DONE; 1881 } 1882 1883 static struct notifier_block geneve_notifier_block __read_mostly = { 1884 .notifier_call = geneve_netdevice_event, 1885 }; 1886 1887 static __net_init int geneve_init_net(struct net *net) 1888 { 1889 struct geneve_net *gn = net_generic(net, geneve_net_id); 1890 1891 INIT_LIST_HEAD(&gn->geneve_list); 1892 INIT_LIST_HEAD(&gn->sock_list); 1893 return 0; 1894 } 1895 1896 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1897 { 1898 struct geneve_net *gn = net_generic(net, geneve_net_id); 1899 struct geneve_dev *geneve, *next; 1900 struct net_device *dev, *aux; 1901 1902 /* gather any geneve devices that were moved into this ns */ 1903 for_each_netdev_safe(net, dev, aux) 1904 if (dev->rtnl_link_ops == &geneve_link_ops) 1905 unregister_netdevice_queue(dev, head); 1906 1907 /* now gather any other geneve devices that were created in this ns */ 1908 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1909 /* If geneve->dev is in the same netns, it was already added 1910 * to the list by the previous loop. 1911 */ 1912 if (!net_eq(dev_net(geneve->dev), net)) 1913 unregister_netdevice_queue(geneve->dev, head); 1914 } 1915 } 1916 1917 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1918 { 1919 struct net *net; 1920 LIST_HEAD(list); 1921 1922 rtnl_lock(); 1923 list_for_each_entry(net, net_list, exit_list) 1924 geneve_destroy_tunnels(net, &list); 1925 1926 /* unregister the devices gathered above */ 1927 unregister_netdevice_many(&list); 1928 rtnl_unlock(); 1929 1930 list_for_each_entry(net, net_list, exit_list) { 1931 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1932 1933 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1934 } 1935 } 1936 1937 static struct pernet_operations geneve_net_ops = { 1938 .init = geneve_init_net, 1939 .exit_batch = geneve_exit_batch_net, 1940 .id = &geneve_net_id, 1941 .size = sizeof(struct geneve_net), 1942 }; 1943 1944 static int __init geneve_init_module(void) 1945 { 1946 int rc; 1947 1948 rc = register_pernet_subsys(&geneve_net_ops); 1949 if (rc) 1950 goto out1; 1951 1952 rc = register_netdevice_notifier(&geneve_notifier_block); 1953 if (rc) 1954 goto out2; 1955 1956 rc = rtnl_link_register(&geneve_link_ops); 1957 if (rc) 1958 goto out3; 1959 1960 return 0; 1961 out3: 1962 unregister_netdevice_notifier(&geneve_notifier_block); 1963 out2: 1964 unregister_pernet_subsys(&geneve_net_ops); 1965 out1: 1966 return rc; 1967 } 1968 late_initcall(geneve_init_module); 1969 1970 static void __exit geneve_cleanup_module(void) 1971 { 1972 rtnl_link_unregister(&geneve_link_ops); 1973 unregister_netdevice_notifier(&geneve_notifier_block); 1974 unregister_pernet_subsys(&geneve_net_ops); 1975 } 1976 module_exit(geneve_cleanup_module); 1977 1978 MODULE_LICENSE("GPL"); 1979 MODULE_VERSION(GENEVE_NETDEV_VER); 1980 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1981 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1982 MODULE_ALIAS_RTNL_LINK("geneve"); 1983