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