1 /* 2 * GENEVE: Generic Network Virtualization Encapsulation 3 * 4 * Copyright (c) 2015 Red Hat, Inc. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/etherdevice.h> 16 #include <linux/hash.h> 17 #include <net/dst_metadata.h> 18 #include <net/gro_cells.h> 19 #include <net/rtnetlink.h> 20 #include <net/geneve.h> 21 #include <net/protocol.h> 22 23 #define GENEVE_NETDEV_VER "0.6" 24 25 #define GENEVE_UDP_PORT 6081 26 27 #define GENEVE_N_VID (1u << 24) 28 #define GENEVE_VID_MASK (GENEVE_N_VID - 1) 29 30 #define VNI_HASH_BITS 10 31 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 32 33 static bool log_ecn_error = true; 34 module_param(log_ecn_error, bool, 0644); 35 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 36 37 #define GENEVE_VER 0 38 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) 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 int geneve_net_id; 47 48 union geneve_addr { 49 struct sockaddr_in sin; 50 struct sockaddr_in6 sin6; 51 struct sockaddr sa; 52 }; 53 54 static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, }; 55 56 /* Pseudo network device */ 57 struct geneve_dev { 58 struct hlist_node hlist; /* vni hash table */ 59 struct net *net; /* netns for packet i/o */ 60 struct net_device *dev; /* netdev for geneve tunnel */ 61 struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */ 62 #if IS_ENABLED(CONFIG_IPV6) 63 struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */ 64 #endif 65 u8 vni[3]; /* virtual network ID for tunnel */ 66 u8 ttl; /* TTL override */ 67 u8 tos; /* TOS override */ 68 union geneve_addr remote; /* IP address for link partner */ 69 struct list_head next; /* geneve's per namespace list */ 70 __be32 label; /* IPv6 flowlabel override */ 71 __be16 dst_port; 72 bool collect_md; 73 struct gro_cells gro_cells; 74 u32 flags; 75 struct dst_cache dst_cache; 76 }; 77 78 /* Geneve device flags */ 79 #define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0) 80 #define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1) 81 #define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2) 82 83 struct geneve_sock { 84 bool collect_md; 85 struct list_head list; 86 struct socket *sock; 87 struct rcu_head rcu; 88 int refcnt; 89 struct hlist_head vni_list[VNI_HASH_SIZE]; 90 u32 flags; 91 }; 92 93 static inline __u32 geneve_net_vni_hash(u8 vni[3]) 94 { 95 __u32 vnid; 96 97 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 98 return hash_32(vnid, VNI_HASH_BITS); 99 } 100 101 static __be64 vni_to_tunnel_id(const __u8 *vni) 102 { 103 #ifdef __BIG_ENDIAN 104 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 105 #else 106 return (__force __be64)(((__force u64)vni[0] << 40) | 107 ((__force u64)vni[1] << 48) | 108 ((__force u64)vni[2] << 56)); 109 #endif 110 } 111 112 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 113 { 114 return gs->sock->sk->sk_family; 115 } 116 117 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 118 __be32 addr, u8 vni[]) 119 { 120 struct hlist_head *vni_list_head; 121 struct geneve_dev *geneve; 122 __u32 hash; 123 124 /* Find the device for this VNI */ 125 hash = geneve_net_vni_hash(vni); 126 vni_list_head = &gs->vni_list[hash]; 127 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) { 128 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && 129 addr == geneve->remote.sin.sin_addr.s_addr) 130 return geneve; 131 } 132 return NULL; 133 } 134 135 #if IS_ENABLED(CONFIG_IPV6) 136 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 137 struct in6_addr addr6, u8 vni[]) 138 { 139 struct hlist_head *vni_list_head; 140 struct geneve_dev *geneve; 141 __u32 hash; 142 143 /* Find the device for this VNI */ 144 hash = geneve_net_vni_hash(vni); 145 vni_list_head = &gs->vni_list[hash]; 146 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) { 147 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && 148 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr)) 149 return geneve; 150 } 151 return NULL; 152 } 153 #endif 154 155 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 156 { 157 return (struct genevehdr *)(udp_hdr(skb) + 1); 158 } 159 160 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 161 struct sk_buff *skb) 162 { 163 u8 *vni; 164 __be32 addr; 165 static u8 zero_vni[3]; 166 #if IS_ENABLED(CONFIG_IPV6) 167 static struct in6_addr zero_addr6; 168 #endif 169 170 if (geneve_get_sk_family(gs) == AF_INET) { 171 struct iphdr *iph; 172 173 iph = ip_hdr(skb); /* outer IP header... */ 174 175 if (gs->collect_md) { 176 vni = zero_vni; 177 addr = 0; 178 } else { 179 vni = geneve_hdr(skb)->vni; 180 addr = iph->saddr; 181 } 182 183 return geneve_lookup(gs, addr, vni); 184 #if IS_ENABLED(CONFIG_IPV6) 185 } else if (geneve_get_sk_family(gs) == AF_INET6) { 186 struct ipv6hdr *ip6h; 187 struct in6_addr addr6; 188 189 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 190 191 if (gs->collect_md) { 192 vni = zero_vni; 193 addr6 = zero_addr6; 194 } else { 195 vni = geneve_hdr(skb)->vni; 196 addr6 = ip6h->saddr; 197 } 198 199 return geneve6_lookup(gs, addr6, vni); 200 #endif 201 } 202 return NULL; 203 } 204 205 /* geneve receive/decap routine */ 206 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 207 struct sk_buff *skb) 208 { 209 struct genevehdr *gnvh = geneve_hdr(skb); 210 struct metadata_dst *tun_dst = NULL; 211 struct pcpu_sw_netstats *stats; 212 int err = 0; 213 void *oiph; 214 215 if (ip_tunnel_collect_metadata() || gs->collect_md) { 216 __be16 flags; 217 218 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | 219 (gnvh->oam ? TUNNEL_OAM : 0) | 220 (gnvh->critical ? TUNNEL_CRIT_OPT : 0); 221 222 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 223 vni_to_tunnel_id(gnvh->vni), 224 gnvh->opt_len * 4); 225 if (!tun_dst) 226 goto drop; 227 /* Update tunnel dst according to Geneve options. */ 228 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 229 gnvh->options, gnvh->opt_len * 4); 230 } else { 231 /* Drop packets w/ critical options, 232 * since we don't support any... 233 */ 234 if (gnvh->critical) 235 goto drop; 236 } 237 238 skb_reset_mac_header(skb); 239 skb->protocol = eth_type_trans(skb, geneve->dev); 240 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 241 242 if (tun_dst) 243 skb_dst_set(skb, &tun_dst->dst); 244 245 /* Ignore packet loops (and multicast echo) */ 246 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) 247 goto drop; 248 249 oiph = skb_network_header(skb); 250 skb_reset_network_header(skb); 251 252 if (geneve_get_sk_family(gs) == AF_INET) 253 err = IP_ECN_decapsulate(oiph, skb); 254 #if IS_ENABLED(CONFIG_IPV6) 255 else 256 err = IP6_ECN_decapsulate(oiph, skb); 257 #endif 258 259 if (unlikely(err)) { 260 if (log_ecn_error) { 261 if (geneve_get_sk_family(gs) == AF_INET) 262 net_info_ratelimited("non-ECT from %pI4 " 263 "with TOS=%#x\n", 264 &((struct iphdr *)oiph)->saddr, 265 ((struct iphdr *)oiph)->tos); 266 #if IS_ENABLED(CONFIG_IPV6) 267 else 268 net_info_ratelimited("non-ECT from %pI6\n", 269 &((struct ipv6hdr *)oiph)->saddr); 270 #endif 271 } 272 if (err > 1) { 273 ++geneve->dev->stats.rx_frame_errors; 274 ++geneve->dev->stats.rx_errors; 275 goto drop; 276 } 277 } 278 279 stats = this_cpu_ptr(geneve->dev->tstats); 280 u64_stats_update_begin(&stats->syncp); 281 stats->rx_packets++; 282 stats->rx_bytes += skb->len; 283 u64_stats_update_end(&stats->syncp); 284 285 gro_cells_receive(&geneve->gro_cells, skb); 286 return; 287 drop: 288 /* Consume bad packet */ 289 kfree_skb(skb); 290 } 291 292 /* Setup stats when device is created */ 293 static int geneve_init(struct net_device *dev) 294 { 295 struct geneve_dev *geneve = netdev_priv(dev); 296 int err; 297 298 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 299 if (!dev->tstats) 300 return -ENOMEM; 301 302 err = gro_cells_init(&geneve->gro_cells, dev); 303 if (err) { 304 free_percpu(dev->tstats); 305 return err; 306 } 307 308 err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL); 309 if (err) { 310 free_percpu(dev->tstats); 311 gro_cells_destroy(&geneve->gro_cells); 312 return err; 313 } 314 315 return 0; 316 } 317 318 static void geneve_uninit(struct net_device *dev) 319 { 320 struct geneve_dev *geneve = netdev_priv(dev); 321 322 dst_cache_destroy(&geneve->dst_cache); 323 gro_cells_destroy(&geneve->gro_cells); 324 free_percpu(dev->tstats); 325 } 326 327 /* Callback from net/ipv4/udp.c to receive packets */ 328 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 329 { 330 struct genevehdr *geneveh; 331 struct geneve_dev *geneve; 332 struct geneve_sock *gs; 333 int opts_len; 334 335 /* Need Geneve and inner Ethernet header to be present */ 336 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 337 goto drop; 338 339 /* Return packets with reserved bits set */ 340 geneveh = geneve_hdr(skb); 341 if (unlikely(geneveh->ver != GENEVE_VER)) 342 goto drop; 343 344 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) 345 goto drop; 346 347 gs = rcu_dereference_sk_user_data(sk); 348 if (!gs) 349 goto drop; 350 351 geneve = geneve_lookup_skb(gs, skb); 352 if (!geneve) 353 goto drop; 354 355 opts_len = geneveh->opt_len * 4; 356 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, 357 htons(ETH_P_TEB), 358 !net_eq(geneve->net, dev_net(geneve->dev)))) 359 goto drop; 360 361 geneve_rx(geneve, gs, skb); 362 return 0; 363 364 drop: 365 /* Consume bad packet */ 366 kfree_skb(skb); 367 return 0; 368 } 369 370 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 371 __be16 port, u32 flags) 372 { 373 struct socket *sock; 374 struct udp_port_cfg udp_conf; 375 int err; 376 377 memset(&udp_conf, 0, sizeof(udp_conf)); 378 379 if (ipv6) { 380 udp_conf.family = AF_INET6; 381 udp_conf.ipv6_v6only = 1; 382 udp_conf.use_udp6_rx_checksums = 383 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX); 384 } else { 385 udp_conf.family = AF_INET; 386 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 387 } 388 389 udp_conf.local_udp_port = port; 390 391 /* Open UDP socket */ 392 err = udp_sock_create(net, &udp_conf, &sock); 393 if (err < 0) 394 return ERR_PTR(err); 395 396 return sock; 397 } 398 399 static int geneve_hlen(struct genevehdr *gh) 400 { 401 return sizeof(*gh) + gh->opt_len * 4; 402 } 403 404 static struct sk_buff **geneve_gro_receive(struct sock *sk, 405 struct sk_buff **head, 406 struct sk_buff *skb) 407 { 408 struct sk_buff *p, **pp = NULL; 409 struct genevehdr *gh, *gh2; 410 unsigned int hlen, gh_len, off_gnv; 411 const struct packet_offload *ptype; 412 __be16 type; 413 int flush = 1; 414 415 off_gnv = skb_gro_offset(skb); 416 hlen = off_gnv + sizeof(*gh); 417 gh = skb_gro_header_fast(skb, off_gnv); 418 if (skb_gro_header_hard(skb, hlen)) { 419 gh = skb_gro_header_slow(skb, hlen, off_gnv); 420 if (unlikely(!gh)) 421 goto out; 422 } 423 424 if (gh->ver != GENEVE_VER || gh->oam) 425 goto out; 426 gh_len = geneve_hlen(gh); 427 428 hlen = off_gnv + gh_len; 429 if (skb_gro_header_hard(skb, hlen)) { 430 gh = skb_gro_header_slow(skb, hlen, off_gnv); 431 if (unlikely(!gh)) 432 goto out; 433 } 434 435 for (p = *head; p; p = p->next) { 436 if (!NAPI_GRO_CB(p)->same_flow) 437 continue; 438 439 gh2 = (struct genevehdr *)(p->data + off_gnv); 440 if (gh->opt_len != gh2->opt_len || 441 memcmp(gh, gh2, gh_len)) { 442 NAPI_GRO_CB(p)->same_flow = 0; 443 continue; 444 } 445 } 446 447 type = gh->proto_type; 448 449 rcu_read_lock(); 450 ptype = gro_find_receive_by_type(type); 451 if (!ptype) 452 goto out_unlock; 453 454 skb_gro_pull(skb, gh_len); 455 skb_gro_postpull_rcsum(skb, gh, gh_len); 456 pp = ptype->callbacks.gro_receive(head, skb); 457 flush = 0; 458 459 out_unlock: 460 rcu_read_unlock(); 461 out: 462 NAPI_GRO_CB(skb)->flush |= flush; 463 464 return pp; 465 } 466 467 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 468 int nhoff) 469 { 470 struct genevehdr *gh; 471 struct packet_offload *ptype; 472 __be16 type; 473 int gh_len; 474 int err = -ENOSYS; 475 476 gh = (struct genevehdr *)(skb->data + nhoff); 477 gh_len = geneve_hlen(gh); 478 type = gh->proto_type; 479 480 rcu_read_lock(); 481 ptype = gro_find_complete_by_type(type); 482 if (ptype) 483 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 484 485 rcu_read_unlock(); 486 487 skb_set_inner_mac_header(skb, nhoff + gh_len); 488 489 return err; 490 } 491 492 /* Create new listen socket if needed */ 493 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 494 bool ipv6, u32 flags) 495 { 496 struct geneve_net *gn = net_generic(net, geneve_net_id); 497 struct geneve_sock *gs; 498 struct socket *sock; 499 struct udp_tunnel_sock_cfg tunnel_cfg; 500 int h; 501 502 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 503 if (!gs) 504 return ERR_PTR(-ENOMEM); 505 506 sock = geneve_create_sock(net, ipv6, port, flags); 507 if (IS_ERR(sock)) { 508 kfree(gs); 509 return ERR_CAST(sock); 510 } 511 512 gs->sock = sock; 513 gs->refcnt = 1; 514 for (h = 0; h < VNI_HASH_SIZE; ++h) 515 INIT_HLIST_HEAD(&gs->vni_list[h]); 516 517 /* Initialize the geneve udp offloads structure */ 518 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 519 520 /* Mark socket as an encapsulation socket */ 521 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 522 tunnel_cfg.sk_user_data = gs; 523 tunnel_cfg.encap_type = 1; 524 tunnel_cfg.gro_receive = geneve_gro_receive; 525 tunnel_cfg.gro_complete = geneve_gro_complete; 526 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 527 tunnel_cfg.encap_destroy = NULL; 528 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 529 list_add(&gs->list, &gn->sock_list); 530 return gs; 531 } 532 533 static void __geneve_sock_release(struct geneve_sock *gs) 534 { 535 if (!gs || --gs->refcnt) 536 return; 537 538 list_del(&gs->list); 539 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 540 udp_tunnel_sock_release(gs->sock); 541 kfree_rcu(gs, rcu); 542 } 543 544 static void geneve_sock_release(struct geneve_dev *geneve) 545 { 546 __geneve_sock_release(geneve->sock4); 547 #if IS_ENABLED(CONFIG_IPV6) 548 __geneve_sock_release(geneve->sock6); 549 #endif 550 } 551 552 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 553 sa_family_t family, 554 __be16 dst_port) 555 { 556 struct geneve_sock *gs; 557 558 list_for_each_entry(gs, &gn->sock_list, list) { 559 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 560 geneve_get_sk_family(gs) == family) { 561 return gs; 562 } 563 } 564 return NULL; 565 } 566 567 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 568 { 569 struct net *net = geneve->net; 570 struct geneve_net *gn = net_generic(net, geneve_net_id); 571 struct geneve_sock *gs; 572 __u32 hash; 573 574 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port); 575 if (gs) { 576 gs->refcnt++; 577 goto out; 578 } 579 580 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags); 581 if (IS_ERR(gs)) 582 return PTR_ERR(gs); 583 584 out: 585 gs->collect_md = geneve->collect_md; 586 gs->flags = geneve->flags; 587 #if IS_ENABLED(CONFIG_IPV6) 588 if (ipv6) 589 geneve->sock6 = gs; 590 else 591 #endif 592 geneve->sock4 = gs; 593 594 hash = geneve_net_vni_hash(geneve->vni); 595 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]); 596 return 0; 597 } 598 599 static int geneve_open(struct net_device *dev) 600 { 601 struct geneve_dev *geneve = netdev_priv(dev); 602 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6; 603 bool metadata = geneve->collect_md; 604 int ret = 0; 605 606 geneve->sock4 = NULL; 607 #if IS_ENABLED(CONFIG_IPV6) 608 geneve->sock6 = NULL; 609 if (ipv6 || metadata) 610 ret = geneve_sock_add(geneve, true); 611 #endif 612 if (!ret && (!ipv6 || metadata)) 613 ret = geneve_sock_add(geneve, false); 614 if (ret < 0) 615 geneve_sock_release(geneve); 616 617 return ret; 618 } 619 620 static int geneve_stop(struct net_device *dev) 621 { 622 struct geneve_dev *geneve = netdev_priv(dev); 623 624 if (!hlist_unhashed(&geneve->hlist)) 625 hlist_del_rcu(&geneve->hlist); 626 geneve_sock_release(geneve); 627 return 0; 628 } 629 630 static void geneve_build_header(struct genevehdr *geneveh, 631 __be16 tun_flags, u8 vni[3], 632 u8 options_len, u8 *options) 633 { 634 geneveh->ver = GENEVE_VER; 635 geneveh->opt_len = options_len / 4; 636 geneveh->oam = !!(tun_flags & TUNNEL_OAM); 637 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT); 638 geneveh->rsvd1 = 0; 639 memcpy(geneveh->vni, vni, 3); 640 geneveh->proto_type = htons(ETH_P_TEB); 641 geneveh->rsvd2 = 0; 642 643 memcpy(geneveh->options, options, options_len); 644 } 645 646 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb, 647 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, 648 u32 flags, bool xnet) 649 { 650 struct genevehdr *gnvh; 651 int min_headroom; 652 int err; 653 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX); 654 655 skb_scrub_packet(skb, xnet); 656 657 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len 658 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr); 659 err = skb_cow_head(skb, min_headroom); 660 if (unlikely(err)) 661 goto free_rt; 662 663 err = udp_tunnel_handle_offloads(skb, udp_sum); 664 if (err) 665 goto free_rt; 666 667 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); 668 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); 669 670 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 671 return 0; 672 673 free_rt: 674 ip_rt_put(rt); 675 return err; 676 } 677 678 #if IS_ENABLED(CONFIG_IPV6) 679 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb, 680 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, 681 u32 flags, bool xnet) 682 { 683 struct genevehdr *gnvh; 684 int min_headroom; 685 int err; 686 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX); 687 688 skb_scrub_packet(skb, xnet); 689 690 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 691 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr); 692 err = skb_cow_head(skb, min_headroom); 693 if (unlikely(err)) 694 goto free_dst; 695 696 err = udp_tunnel_handle_offloads(skb, udp_sum); 697 if (err) 698 goto free_dst; 699 700 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); 701 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); 702 703 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 704 return 0; 705 706 free_dst: 707 dst_release(dst); 708 return err; 709 } 710 #endif 711 712 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 713 struct net_device *dev, 714 struct flowi4 *fl4, 715 struct ip_tunnel_info *info) 716 { 717 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 718 struct geneve_dev *geneve = netdev_priv(dev); 719 struct dst_cache *dst_cache; 720 struct rtable *rt = NULL; 721 __u8 tos; 722 723 memset(fl4, 0, sizeof(*fl4)); 724 fl4->flowi4_mark = skb->mark; 725 fl4->flowi4_proto = IPPROTO_UDP; 726 727 if (info) { 728 fl4->daddr = info->key.u.ipv4.dst; 729 fl4->saddr = info->key.u.ipv4.src; 730 fl4->flowi4_tos = RT_TOS(info->key.tos); 731 dst_cache = &info->dst_cache; 732 } else { 733 tos = geneve->tos; 734 if (tos == 1) { 735 const struct iphdr *iip = ip_hdr(skb); 736 737 tos = ip_tunnel_get_dsfield(iip, skb); 738 use_cache = false; 739 } 740 741 fl4->flowi4_tos = RT_TOS(tos); 742 fl4->daddr = geneve->remote.sin.sin_addr.s_addr; 743 dst_cache = &geneve->dst_cache; 744 } 745 746 if (use_cache) { 747 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 748 if (rt) 749 return rt; 750 } 751 752 rt = ip_route_output_key(geneve->net, fl4); 753 if (IS_ERR(rt)) { 754 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 755 return ERR_PTR(-ENETUNREACH); 756 } 757 if (rt->dst.dev == dev) { /* is this necessary? */ 758 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 759 ip_rt_put(rt); 760 return ERR_PTR(-ELOOP); 761 } 762 if (use_cache) 763 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 764 return rt; 765 } 766 767 #if IS_ENABLED(CONFIG_IPV6) 768 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 769 struct net_device *dev, 770 struct flowi6 *fl6, 771 struct ip_tunnel_info *info) 772 { 773 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 774 struct geneve_dev *geneve = netdev_priv(dev); 775 struct geneve_sock *gs6 = geneve->sock6; 776 struct dst_entry *dst = NULL; 777 struct dst_cache *dst_cache; 778 __u8 prio; 779 780 memset(fl6, 0, sizeof(*fl6)); 781 fl6->flowi6_mark = skb->mark; 782 fl6->flowi6_proto = IPPROTO_UDP; 783 784 if (info) { 785 fl6->daddr = info->key.u.ipv6.dst; 786 fl6->saddr = info->key.u.ipv6.src; 787 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos), 788 info->key.label); 789 dst_cache = &info->dst_cache; 790 } else { 791 prio = geneve->tos; 792 if (prio == 1) { 793 const struct iphdr *iip = ip_hdr(skb); 794 795 prio = ip_tunnel_get_dsfield(iip, skb); 796 use_cache = false; 797 } 798 799 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 800 geneve->label); 801 fl6->daddr = geneve->remote.sin6.sin6_addr; 802 dst_cache = &geneve->dst_cache; 803 } 804 805 if (use_cache) { 806 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 807 if (dst) 808 return dst; 809 } 810 811 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) { 812 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 813 return ERR_PTR(-ENETUNREACH); 814 } 815 if (dst->dev == dev) { /* is this necessary? */ 816 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 817 dst_release(dst); 818 return ERR_PTR(-ELOOP); 819 } 820 821 if (use_cache) 822 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 823 return dst; 824 } 825 #endif 826 827 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 828 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 829 { 830 #ifdef __BIG_ENDIAN 831 vni[0] = (__force __u8)(tun_id >> 16); 832 vni[1] = (__force __u8)(tun_id >> 8); 833 vni[2] = (__force __u8)tun_id; 834 #else 835 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 836 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 837 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 838 #endif 839 } 840 841 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 842 struct ip_tunnel_info *info) 843 { 844 struct geneve_dev *geneve = netdev_priv(dev); 845 struct geneve_sock *gs4 = geneve->sock4; 846 struct rtable *rt = NULL; 847 const struct iphdr *iip; /* interior IP header */ 848 int err = -EINVAL; 849 struct flowi4 fl4; 850 __u8 tos, ttl; 851 __be16 sport; 852 __be16 df; 853 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 854 u32 flags = geneve->flags; 855 856 if (geneve->collect_md) { 857 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 858 netdev_dbg(dev, "no tunnel metadata\n"); 859 goto tx_error; 860 } 861 if (info && ip_tunnel_info_af(info) != AF_INET) 862 goto tx_error; 863 } 864 865 rt = geneve_get_v4_rt(skb, dev, &fl4, info); 866 if (IS_ERR(rt)) { 867 err = PTR_ERR(rt); 868 goto tx_error; 869 } 870 871 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 872 skb_reset_mac_header(skb); 873 874 iip = ip_hdr(skb); 875 876 if (info) { 877 const struct ip_tunnel_key *key = &info->key; 878 u8 *opts = NULL; 879 u8 vni[3]; 880 881 tunnel_id_to_vni(key->tun_id, vni); 882 if (info->options_len) 883 opts = ip_tunnel_info_opts(info); 884 885 if (key->tun_flags & TUNNEL_CSUM) 886 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX; 887 else 888 flags |= GENEVE_F_UDP_ZERO_CSUM_TX; 889 890 err = geneve_build_skb(rt, skb, key->tun_flags, vni, 891 info->options_len, opts, flags, xnet); 892 if (unlikely(err)) 893 goto tx_error; 894 895 tos = ip_tunnel_ecn_encap(key->tos, iip, skb); 896 ttl = key->ttl; 897 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 898 } else { 899 err = geneve_build_skb(rt, skb, 0, geneve->vni, 900 0, NULL, flags, xnet); 901 if (unlikely(err)) 902 goto tx_error; 903 904 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb); 905 ttl = geneve->ttl; 906 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr))) 907 ttl = 1; 908 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 909 df = 0; 910 } 911 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 912 tos, ttl, df, sport, geneve->dst_port, 913 !net_eq(geneve->net, dev_net(geneve->dev)), 914 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX)); 915 916 return NETDEV_TX_OK; 917 918 tx_error: 919 dev_kfree_skb(skb); 920 921 if (err == -ELOOP) 922 dev->stats.collisions++; 923 else if (err == -ENETUNREACH) 924 dev->stats.tx_carrier_errors++; 925 926 dev->stats.tx_errors++; 927 return NETDEV_TX_OK; 928 } 929 930 #if IS_ENABLED(CONFIG_IPV6) 931 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 932 struct ip_tunnel_info *info) 933 { 934 struct geneve_dev *geneve = netdev_priv(dev); 935 struct geneve_sock *gs6 = geneve->sock6; 936 struct dst_entry *dst = NULL; 937 const struct iphdr *iip; /* interior IP header */ 938 int err = -EINVAL; 939 struct flowi6 fl6; 940 __u8 prio, ttl; 941 __be16 sport; 942 __be32 label; 943 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 944 u32 flags = geneve->flags; 945 946 if (geneve->collect_md) { 947 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 948 netdev_dbg(dev, "no tunnel metadata\n"); 949 goto tx_error; 950 } 951 } 952 953 dst = geneve_get_v6_dst(skb, dev, &fl6, info); 954 if (IS_ERR(dst)) { 955 err = PTR_ERR(dst); 956 goto tx_error; 957 } 958 959 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 960 skb_reset_mac_header(skb); 961 962 iip = ip_hdr(skb); 963 964 if (info) { 965 const struct ip_tunnel_key *key = &info->key; 966 u8 *opts = NULL; 967 u8 vni[3]; 968 969 tunnel_id_to_vni(key->tun_id, vni); 970 if (info->options_len) 971 opts = ip_tunnel_info_opts(info); 972 973 if (key->tun_flags & TUNNEL_CSUM) 974 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX; 975 else 976 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; 977 978 err = geneve6_build_skb(dst, skb, key->tun_flags, vni, 979 info->options_len, opts, 980 flags, xnet); 981 if (unlikely(err)) 982 goto tx_error; 983 984 prio = ip_tunnel_ecn_encap(key->tos, iip, skb); 985 ttl = key->ttl; 986 label = info->key.label; 987 } else { 988 err = geneve6_build_skb(dst, skb, 0, geneve->vni, 989 0, NULL, flags, xnet); 990 if (unlikely(err)) 991 goto tx_error; 992 993 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 994 iip, skb); 995 ttl = geneve->ttl; 996 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr)) 997 ttl = 1; 998 ttl = ttl ? : ip6_dst_hoplimit(dst); 999 label = geneve->label; 1000 } 1001 1002 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1003 &fl6.saddr, &fl6.daddr, prio, ttl, label, 1004 sport, geneve->dst_port, 1005 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX)); 1006 return NETDEV_TX_OK; 1007 1008 tx_error: 1009 dev_kfree_skb(skb); 1010 1011 if (err == -ELOOP) 1012 dev->stats.collisions++; 1013 else if (err == -ENETUNREACH) 1014 dev->stats.tx_carrier_errors++; 1015 1016 dev->stats.tx_errors++; 1017 return NETDEV_TX_OK; 1018 } 1019 #endif 1020 1021 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1022 { 1023 struct geneve_dev *geneve = netdev_priv(dev); 1024 struct ip_tunnel_info *info = NULL; 1025 1026 if (geneve->collect_md) 1027 info = skb_tunnel_info(skb); 1028 1029 #if IS_ENABLED(CONFIG_IPV6) 1030 if ((info && ip_tunnel_info_af(info) == AF_INET6) || 1031 (!info && geneve->remote.sa.sa_family == AF_INET6)) 1032 return geneve6_xmit_skb(skb, dev, info); 1033 #endif 1034 return geneve_xmit_skb(skb, dev, info); 1035 } 1036 1037 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict) 1038 { 1039 struct geneve_dev *geneve = netdev_priv(dev); 1040 /* The max_mtu calculation does not take account of GENEVE 1041 * options, to avoid excluding potentially valid 1042 * configurations. 1043 */ 1044 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1045 1046 if (geneve->remote.sa.sa_family == AF_INET6) 1047 max_mtu -= sizeof(struct ipv6hdr); 1048 else 1049 max_mtu -= sizeof(struct iphdr); 1050 1051 if (new_mtu < 68) 1052 return -EINVAL; 1053 1054 if (new_mtu > max_mtu) { 1055 if (strict) 1056 return -EINVAL; 1057 1058 new_mtu = max_mtu; 1059 } 1060 1061 dev->mtu = new_mtu; 1062 return 0; 1063 } 1064 1065 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1066 { 1067 return __geneve_change_mtu(dev, new_mtu, true); 1068 } 1069 1070 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1071 { 1072 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1073 struct geneve_dev *geneve = netdev_priv(dev); 1074 struct rtable *rt; 1075 struct flowi4 fl4; 1076 #if IS_ENABLED(CONFIG_IPV6) 1077 struct dst_entry *dst; 1078 struct flowi6 fl6; 1079 #endif 1080 1081 if (ip_tunnel_info_af(info) == AF_INET) { 1082 rt = geneve_get_v4_rt(skb, dev, &fl4, info); 1083 if (IS_ERR(rt)) 1084 return PTR_ERR(rt); 1085 1086 ip_rt_put(rt); 1087 info->key.u.ipv4.src = fl4.saddr; 1088 #if IS_ENABLED(CONFIG_IPV6) 1089 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1090 dst = geneve_get_v6_dst(skb, dev, &fl6, info); 1091 if (IS_ERR(dst)) 1092 return PTR_ERR(dst); 1093 1094 dst_release(dst); 1095 info->key.u.ipv6.src = fl6.saddr; 1096 #endif 1097 } else { 1098 return -EINVAL; 1099 } 1100 1101 info->key.tp_src = udp_flow_src_port(geneve->net, skb, 1102 1, USHRT_MAX, true); 1103 info->key.tp_dst = geneve->dst_port; 1104 return 0; 1105 } 1106 1107 static const struct net_device_ops geneve_netdev_ops = { 1108 .ndo_init = geneve_init, 1109 .ndo_uninit = geneve_uninit, 1110 .ndo_open = geneve_open, 1111 .ndo_stop = geneve_stop, 1112 .ndo_start_xmit = geneve_xmit, 1113 .ndo_get_stats64 = ip_tunnel_get_stats64, 1114 .ndo_change_mtu = geneve_change_mtu, 1115 .ndo_validate_addr = eth_validate_addr, 1116 .ndo_set_mac_address = eth_mac_addr, 1117 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1118 }; 1119 1120 static void geneve_get_drvinfo(struct net_device *dev, 1121 struct ethtool_drvinfo *drvinfo) 1122 { 1123 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1124 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1125 } 1126 1127 static const struct ethtool_ops geneve_ethtool_ops = { 1128 .get_drvinfo = geneve_get_drvinfo, 1129 .get_link = ethtool_op_get_link, 1130 }; 1131 1132 /* Info for udev, that this is a virtual tunnel endpoint */ 1133 static struct device_type geneve_type = { 1134 .name = "geneve", 1135 }; 1136 1137 /* Calls the ndo_udp_tunnel_add of the caller in order to 1138 * supply the listening GENEVE udp ports. Callers are expected 1139 * to implement the ndo_udp_tunnel_add. 1140 */ 1141 static void geneve_push_rx_ports(struct net_device *dev) 1142 { 1143 struct net *net = dev_net(dev); 1144 struct geneve_net *gn = net_generic(net, geneve_net_id); 1145 struct geneve_sock *gs; 1146 1147 rcu_read_lock(); 1148 list_for_each_entry_rcu(gs, &gn->sock_list, list) 1149 udp_tunnel_push_rx_port(dev, gs->sock, 1150 UDP_TUNNEL_TYPE_GENEVE); 1151 rcu_read_unlock(); 1152 } 1153 1154 /* Initialize the device structure. */ 1155 static void geneve_setup(struct net_device *dev) 1156 { 1157 ether_setup(dev); 1158 1159 dev->netdev_ops = &geneve_netdev_ops; 1160 dev->ethtool_ops = &geneve_ethtool_ops; 1161 dev->destructor = free_netdev; 1162 1163 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1164 1165 dev->features |= NETIF_F_LLTX; 1166 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1167 dev->features |= NETIF_F_RXCSUM; 1168 dev->features |= NETIF_F_GSO_SOFTWARE; 1169 1170 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 1171 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1172 1173 netif_keep_dst(dev); 1174 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1175 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1176 eth_hw_addr_random(dev); 1177 } 1178 1179 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1180 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1181 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, 1182 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1183 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1184 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1185 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1186 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1187 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1188 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1189 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1190 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1191 }; 1192 1193 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) 1194 { 1195 if (tb[IFLA_ADDRESS]) { 1196 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1197 return -EINVAL; 1198 1199 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1200 return -EADDRNOTAVAIL; 1201 } 1202 1203 if (!data) 1204 return -EINVAL; 1205 1206 if (data[IFLA_GENEVE_ID]) { 1207 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1208 1209 if (vni >= GENEVE_VID_MASK) 1210 return -ERANGE; 1211 } 1212 1213 return 0; 1214 } 1215 1216 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1217 __be16 dst_port, 1218 union geneve_addr *remote, 1219 u8 vni[], 1220 bool *tun_on_same_port, 1221 bool *tun_collect_md) 1222 { 1223 struct geneve_dev *geneve, *t; 1224 1225 *tun_on_same_port = false; 1226 *tun_collect_md = false; 1227 t = NULL; 1228 list_for_each_entry(geneve, &gn->geneve_list, next) { 1229 if (geneve->dst_port == dst_port) { 1230 *tun_collect_md = geneve->collect_md; 1231 *tun_on_same_port = true; 1232 } 1233 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && 1234 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) && 1235 dst_port == geneve->dst_port) 1236 t = geneve; 1237 } 1238 return t; 1239 } 1240 1241 static int geneve_configure(struct net *net, struct net_device *dev, 1242 union geneve_addr *remote, 1243 __u32 vni, __u8 ttl, __u8 tos, __be32 label, 1244 __be16 dst_port, bool metadata, u32 flags) 1245 { 1246 struct geneve_net *gn = net_generic(net, geneve_net_id); 1247 struct geneve_dev *t, *geneve = netdev_priv(dev); 1248 bool tun_collect_md, tun_on_same_port; 1249 int err, encap_len; 1250 1251 if (!remote) 1252 return -EINVAL; 1253 if (metadata && 1254 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label)) 1255 return -EINVAL; 1256 1257 geneve->net = net; 1258 geneve->dev = dev; 1259 1260 geneve->vni[0] = (vni & 0x00ff0000) >> 16; 1261 geneve->vni[1] = (vni & 0x0000ff00) >> 8; 1262 geneve->vni[2] = vni & 0x000000ff; 1263 1264 if ((remote->sa.sa_family == AF_INET && 1265 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) || 1266 (remote->sa.sa_family == AF_INET6 && 1267 ipv6_addr_is_multicast(&remote->sin6.sin6_addr))) 1268 return -EINVAL; 1269 if (label && remote->sa.sa_family != AF_INET6) 1270 return -EINVAL; 1271 1272 geneve->remote = *remote; 1273 1274 geneve->ttl = ttl; 1275 geneve->tos = tos; 1276 geneve->label = label; 1277 geneve->dst_port = dst_port; 1278 geneve->collect_md = metadata; 1279 geneve->flags = flags; 1280 1281 t = geneve_find_dev(gn, dst_port, remote, geneve->vni, 1282 &tun_on_same_port, &tun_collect_md); 1283 if (t) 1284 return -EBUSY; 1285 1286 /* make enough headroom for basic scenario */ 1287 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1288 if (remote->sa.sa_family == AF_INET) 1289 encap_len += sizeof(struct iphdr); 1290 else 1291 encap_len += sizeof(struct ipv6hdr); 1292 dev->needed_headroom = encap_len + ETH_HLEN; 1293 1294 if (metadata) { 1295 if (tun_on_same_port) 1296 return -EPERM; 1297 } else { 1298 if (tun_collect_md) 1299 return -EPERM; 1300 } 1301 1302 dst_cache_reset(&geneve->dst_cache); 1303 1304 err = register_netdevice(dev); 1305 if (err) 1306 return err; 1307 1308 list_add(&geneve->next, &gn->geneve_list); 1309 return 0; 1310 } 1311 1312 static int geneve_newlink(struct net *net, struct net_device *dev, 1313 struct nlattr *tb[], struct nlattr *data[]) 1314 { 1315 __be16 dst_port = htons(GENEVE_UDP_PORT); 1316 __u8 ttl = 0, tos = 0; 1317 bool metadata = false; 1318 union geneve_addr remote = geneve_remote_unspec; 1319 __be32 label = 0; 1320 __u32 vni = 0; 1321 u32 flags = 0; 1322 1323 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) 1324 return -EINVAL; 1325 1326 if (data[IFLA_GENEVE_REMOTE]) { 1327 remote.sa.sa_family = AF_INET; 1328 remote.sin.sin_addr.s_addr = 1329 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1330 } 1331 1332 if (data[IFLA_GENEVE_REMOTE6]) { 1333 if (!IS_ENABLED(CONFIG_IPV6)) 1334 return -EPFNOSUPPORT; 1335 1336 remote.sa.sa_family = AF_INET6; 1337 remote.sin6.sin6_addr = 1338 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1339 1340 if (ipv6_addr_type(&remote.sin6.sin6_addr) & 1341 IPV6_ADDR_LINKLOCAL) { 1342 netdev_dbg(dev, "link-local remote is unsupported\n"); 1343 return -EINVAL; 1344 } 1345 } 1346 1347 if (data[IFLA_GENEVE_ID]) 1348 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1349 1350 if (data[IFLA_GENEVE_TTL]) 1351 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1352 1353 if (data[IFLA_GENEVE_TOS]) 1354 tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1355 1356 if (data[IFLA_GENEVE_LABEL]) 1357 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1358 IPV6_FLOWLABEL_MASK; 1359 1360 if (data[IFLA_GENEVE_PORT]) 1361 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]); 1362 1363 if (data[IFLA_GENEVE_COLLECT_METADATA]) 1364 metadata = true; 1365 1366 if (data[IFLA_GENEVE_UDP_CSUM] && 1367 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1368 flags |= GENEVE_F_UDP_ZERO_CSUM_TX; 1369 1370 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] && 1371 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1372 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; 1373 1374 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] && 1375 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1376 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX; 1377 1378 return geneve_configure(net, dev, &remote, vni, ttl, tos, label, 1379 dst_port, metadata, flags); 1380 } 1381 1382 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1383 { 1384 struct geneve_dev *geneve = netdev_priv(dev); 1385 1386 list_del(&geneve->next); 1387 unregister_netdevice_queue(dev, head); 1388 } 1389 1390 static size_t geneve_get_size(const struct net_device *dev) 1391 { 1392 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1393 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1394 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1395 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1396 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1397 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1398 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1399 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1400 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1401 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1402 0; 1403 } 1404 1405 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1406 { 1407 struct geneve_dev *geneve = netdev_priv(dev); 1408 __u32 vni; 1409 1410 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2]; 1411 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1412 goto nla_put_failure; 1413 1414 if (geneve->remote.sa.sa_family == AF_INET) { 1415 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1416 geneve->remote.sin.sin_addr.s_addr)) 1417 goto nla_put_failure; 1418 #if IS_ENABLED(CONFIG_IPV6) 1419 } else { 1420 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1421 &geneve->remote.sin6.sin6_addr)) 1422 goto nla_put_failure; 1423 #endif 1424 } 1425 1426 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) || 1427 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) || 1428 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label)) 1429 goto nla_put_failure; 1430 1431 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port)) 1432 goto nla_put_failure; 1433 1434 if (geneve->collect_md) { 1435 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1436 goto nla_put_failure; 1437 } 1438 1439 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1440 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) || 1441 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1442 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) || 1443 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1444 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX))) 1445 goto nla_put_failure; 1446 1447 return 0; 1448 1449 nla_put_failure: 1450 return -EMSGSIZE; 1451 } 1452 1453 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1454 .kind = "geneve", 1455 .maxtype = IFLA_GENEVE_MAX, 1456 .policy = geneve_policy, 1457 .priv_size = sizeof(struct geneve_dev), 1458 .setup = geneve_setup, 1459 .validate = geneve_validate, 1460 .newlink = geneve_newlink, 1461 .dellink = geneve_dellink, 1462 .get_size = geneve_get_size, 1463 .fill_info = geneve_fill_info, 1464 }; 1465 1466 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1467 u8 name_assign_type, u16 dst_port) 1468 { 1469 struct nlattr *tb[IFLA_MAX + 1]; 1470 struct net_device *dev; 1471 LIST_HEAD(list_kill); 1472 int err; 1473 1474 memset(tb, 0, sizeof(tb)); 1475 dev = rtnl_create_link(net, name, name_assign_type, 1476 &geneve_link_ops, tb); 1477 if (IS_ERR(dev)) 1478 return dev; 1479 1480 err = geneve_configure(net, dev, &geneve_remote_unspec, 1481 0, 0, 0, 0, htons(dst_port), true, 1482 GENEVE_F_UDP_ZERO_CSUM6_RX); 1483 if (err) { 1484 free_netdev(dev); 1485 return ERR_PTR(err); 1486 } 1487 1488 /* openvswitch users expect packet sizes to be unrestricted, 1489 * so set the largest MTU we can. 1490 */ 1491 err = __geneve_change_mtu(dev, IP_MAX_MTU, false); 1492 if (err) 1493 goto err; 1494 1495 err = rtnl_configure_link(dev, NULL); 1496 if (err < 0) 1497 goto err; 1498 1499 return dev; 1500 1501 err: 1502 geneve_dellink(dev, &list_kill); 1503 unregister_netdevice_many(&list_kill); 1504 return ERR_PTR(err); 1505 } 1506 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1507 1508 static int geneve_netdevice_event(struct notifier_block *unused, 1509 unsigned long event, void *ptr) 1510 { 1511 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1512 1513 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1514 geneve_push_rx_ports(dev); 1515 1516 return NOTIFY_DONE; 1517 } 1518 1519 static struct notifier_block geneve_notifier_block __read_mostly = { 1520 .notifier_call = geneve_netdevice_event, 1521 }; 1522 1523 static __net_init int geneve_init_net(struct net *net) 1524 { 1525 struct geneve_net *gn = net_generic(net, geneve_net_id); 1526 1527 INIT_LIST_HEAD(&gn->geneve_list); 1528 INIT_LIST_HEAD(&gn->sock_list); 1529 return 0; 1530 } 1531 1532 static void __net_exit geneve_exit_net(struct net *net) 1533 { 1534 struct geneve_net *gn = net_generic(net, geneve_net_id); 1535 struct geneve_dev *geneve, *next; 1536 struct net_device *dev, *aux; 1537 LIST_HEAD(list); 1538 1539 rtnl_lock(); 1540 1541 /* gather any geneve devices that were moved into this ns */ 1542 for_each_netdev_safe(net, dev, aux) 1543 if (dev->rtnl_link_ops == &geneve_link_ops) 1544 unregister_netdevice_queue(dev, &list); 1545 1546 /* now gather any other geneve devices that were created in this ns */ 1547 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1548 /* If geneve->dev is in the same netns, it was already added 1549 * to the list by the previous loop. 1550 */ 1551 if (!net_eq(dev_net(geneve->dev), net)) 1552 unregister_netdevice_queue(geneve->dev, &list); 1553 } 1554 1555 /* unregister the devices gathered above */ 1556 unregister_netdevice_many(&list); 1557 rtnl_unlock(); 1558 } 1559 1560 static struct pernet_operations geneve_net_ops = { 1561 .init = geneve_init_net, 1562 .exit = geneve_exit_net, 1563 .id = &geneve_net_id, 1564 .size = sizeof(struct geneve_net), 1565 }; 1566 1567 static int __init geneve_init_module(void) 1568 { 1569 int rc; 1570 1571 rc = register_pernet_subsys(&geneve_net_ops); 1572 if (rc) 1573 goto out1; 1574 1575 rc = register_netdevice_notifier(&geneve_notifier_block); 1576 if (rc) 1577 goto out2; 1578 1579 rc = rtnl_link_register(&geneve_link_ops); 1580 if (rc) 1581 goto out3; 1582 1583 return 0; 1584 1585 out3: 1586 unregister_netdevice_notifier(&geneve_notifier_block); 1587 out2: 1588 unregister_pernet_subsys(&geneve_net_ops); 1589 out1: 1590 return rc; 1591 } 1592 late_initcall(geneve_init_module); 1593 1594 static void __exit geneve_cleanup_module(void) 1595 { 1596 rtnl_link_unregister(&geneve_link_ops); 1597 unregister_netdevice_notifier(&geneve_notifier_block); 1598 unregister_pernet_subsys(&geneve_net_ops); 1599 } 1600 module_exit(geneve_cleanup_module); 1601 1602 MODULE_LICENSE("GPL"); 1603 MODULE_VERSION(GENEVE_NETDEV_VER); 1604 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1605 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1606 MODULE_ALIAS_RTNL_LINK("geneve"); 1607