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 __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 62 #if IS_ENABLED(CONFIG_IPV6) 63 struct geneve_sock __rcu *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 = call_gro_receive(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 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 547 #if IS_ENABLED(CONFIG_IPV6) 548 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 549 550 rcu_assign_pointer(geneve->sock6, NULL); 551 #endif 552 553 rcu_assign_pointer(geneve->sock4, NULL); 554 synchronize_net(); 555 556 __geneve_sock_release(gs4); 557 #if IS_ENABLED(CONFIG_IPV6) 558 __geneve_sock_release(gs6); 559 #endif 560 } 561 562 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 563 sa_family_t family, 564 __be16 dst_port) 565 { 566 struct geneve_sock *gs; 567 568 list_for_each_entry(gs, &gn->sock_list, list) { 569 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 570 geneve_get_sk_family(gs) == family) { 571 return gs; 572 } 573 } 574 return NULL; 575 } 576 577 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 578 { 579 struct net *net = geneve->net; 580 struct geneve_net *gn = net_generic(net, geneve_net_id); 581 struct geneve_sock *gs; 582 __u32 hash; 583 584 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port); 585 if (gs) { 586 gs->refcnt++; 587 goto out; 588 } 589 590 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags); 591 if (IS_ERR(gs)) 592 return PTR_ERR(gs); 593 594 out: 595 gs->collect_md = geneve->collect_md; 596 gs->flags = geneve->flags; 597 #if IS_ENABLED(CONFIG_IPV6) 598 if (ipv6) 599 rcu_assign_pointer(geneve->sock6, gs); 600 else 601 #endif 602 rcu_assign_pointer(geneve->sock4, gs); 603 604 hash = geneve_net_vni_hash(geneve->vni); 605 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]); 606 return 0; 607 } 608 609 static int geneve_open(struct net_device *dev) 610 { 611 struct geneve_dev *geneve = netdev_priv(dev); 612 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6; 613 bool metadata = geneve->collect_md; 614 int ret = 0; 615 616 #if IS_ENABLED(CONFIG_IPV6) 617 if (ipv6 || metadata) 618 ret = geneve_sock_add(geneve, true); 619 #endif 620 if (!ret && (!ipv6 || metadata)) 621 ret = geneve_sock_add(geneve, false); 622 if (ret < 0) 623 geneve_sock_release(geneve); 624 625 return ret; 626 } 627 628 static int geneve_stop(struct net_device *dev) 629 { 630 struct geneve_dev *geneve = netdev_priv(dev); 631 632 if (!hlist_unhashed(&geneve->hlist)) 633 hlist_del_rcu(&geneve->hlist); 634 geneve_sock_release(geneve); 635 return 0; 636 } 637 638 static void geneve_build_header(struct genevehdr *geneveh, 639 __be16 tun_flags, u8 vni[3], 640 u8 options_len, u8 *options) 641 { 642 geneveh->ver = GENEVE_VER; 643 geneveh->opt_len = options_len / 4; 644 geneveh->oam = !!(tun_flags & TUNNEL_OAM); 645 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT); 646 geneveh->rsvd1 = 0; 647 memcpy(geneveh->vni, vni, 3); 648 geneveh->proto_type = htons(ETH_P_TEB); 649 geneveh->rsvd2 = 0; 650 651 memcpy(geneveh->options, options, options_len); 652 } 653 654 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb, 655 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, 656 u32 flags, bool xnet) 657 { 658 struct genevehdr *gnvh; 659 int min_headroom; 660 int err; 661 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX); 662 663 skb_scrub_packet(skb, xnet); 664 665 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len 666 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr); 667 err = skb_cow_head(skb, min_headroom); 668 if (unlikely(err)) 669 goto free_rt; 670 671 err = udp_tunnel_handle_offloads(skb, udp_sum); 672 if (err) 673 goto free_rt; 674 675 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); 676 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); 677 678 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 679 return 0; 680 681 free_rt: 682 ip_rt_put(rt); 683 return err; 684 } 685 686 #if IS_ENABLED(CONFIG_IPV6) 687 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb, 688 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, 689 u32 flags, bool xnet) 690 { 691 struct genevehdr *gnvh; 692 int min_headroom; 693 int err; 694 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX); 695 696 skb_scrub_packet(skb, xnet); 697 698 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 699 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr); 700 err = skb_cow_head(skb, min_headroom); 701 if (unlikely(err)) 702 goto free_dst; 703 704 err = udp_tunnel_handle_offloads(skb, udp_sum); 705 if (err) 706 goto free_dst; 707 708 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); 709 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); 710 711 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 712 return 0; 713 714 free_dst: 715 dst_release(dst); 716 return err; 717 } 718 #endif 719 720 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 721 struct net_device *dev, 722 struct flowi4 *fl4, 723 struct ip_tunnel_info *info) 724 { 725 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 726 struct geneve_dev *geneve = netdev_priv(dev); 727 struct dst_cache *dst_cache; 728 struct rtable *rt = NULL; 729 __u8 tos; 730 731 if (!rcu_dereference(geneve->sock4)) 732 return ERR_PTR(-EIO); 733 734 memset(fl4, 0, sizeof(*fl4)); 735 fl4->flowi4_mark = skb->mark; 736 fl4->flowi4_proto = IPPROTO_UDP; 737 738 if (info) { 739 fl4->daddr = info->key.u.ipv4.dst; 740 fl4->saddr = info->key.u.ipv4.src; 741 fl4->flowi4_tos = RT_TOS(info->key.tos); 742 dst_cache = &info->dst_cache; 743 } else { 744 tos = geneve->tos; 745 if (tos == 1) { 746 const struct iphdr *iip = ip_hdr(skb); 747 748 tos = ip_tunnel_get_dsfield(iip, skb); 749 use_cache = false; 750 } 751 752 fl4->flowi4_tos = RT_TOS(tos); 753 fl4->daddr = geneve->remote.sin.sin_addr.s_addr; 754 dst_cache = &geneve->dst_cache; 755 } 756 757 if (use_cache) { 758 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 759 if (rt) 760 return rt; 761 } 762 763 rt = ip_route_output_key(geneve->net, fl4); 764 if (IS_ERR(rt)) { 765 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 766 return ERR_PTR(-ENETUNREACH); 767 } 768 if (rt->dst.dev == dev) { /* is this necessary? */ 769 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 770 ip_rt_put(rt); 771 return ERR_PTR(-ELOOP); 772 } 773 if (use_cache) 774 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 775 return rt; 776 } 777 778 #if IS_ENABLED(CONFIG_IPV6) 779 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 780 struct net_device *dev, 781 struct flowi6 *fl6, 782 struct ip_tunnel_info *info) 783 { 784 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 785 struct geneve_dev *geneve = netdev_priv(dev); 786 struct dst_entry *dst = NULL; 787 struct dst_cache *dst_cache; 788 struct geneve_sock *gs6; 789 __u8 prio; 790 791 gs6 = rcu_dereference(geneve->sock6); 792 if (!gs6) 793 return ERR_PTR(-EIO); 794 795 memset(fl6, 0, sizeof(*fl6)); 796 fl6->flowi6_mark = skb->mark; 797 fl6->flowi6_proto = IPPROTO_UDP; 798 799 if (info) { 800 fl6->daddr = info->key.u.ipv6.dst; 801 fl6->saddr = info->key.u.ipv6.src; 802 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos), 803 info->key.label); 804 dst_cache = &info->dst_cache; 805 } else { 806 prio = geneve->tos; 807 if (prio == 1) { 808 const struct iphdr *iip = ip_hdr(skb); 809 810 prio = ip_tunnel_get_dsfield(iip, skb); 811 use_cache = false; 812 } 813 814 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 815 geneve->label); 816 fl6->daddr = geneve->remote.sin6.sin6_addr; 817 dst_cache = &geneve->dst_cache; 818 } 819 820 if (use_cache) { 821 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 822 if (dst) 823 return dst; 824 } 825 826 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) { 827 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 828 return ERR_PTR(-ENETUNREACH); 829 } 830 if (dst->dev == dev) { /* is this necessary? */ 831 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 832 dst_release(dst); 833 return ERR_PTR(-ELOOP); 834 } 835 836 if (use_cache) 837 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 838 return dst; 839 } 840 #endif 841 842 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 843 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 844 { 845 #ifdef __BIG_ENDIAN 846 vni[0] = (__force __u8)(tun_id >> 16); 847 vni[1] = (__force __u8)(tun_id >> 8); 848 vni[2] = (__force __u8)tun_id; 849 #else 850 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 851 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 852 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 853 #endif 854 } 855 856 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 857 struct ip_tunnel_info *info) 858 { 859 struct geneve_dev *geneve = netdev_priv(dev); 860 struct geneve_sock *gs4; 861 struct rtable *rt = NULL; 862 const struct iphdr *iip; /* interior IP header */ 863 int err = -EINVAL; 864 struct flowi4 fl4; 865 __u8 tos, ttl; 866 __be16 sport; 867 __be16 df; 868 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 869 u32 flags = geneve->flags; 870 871 gs4 = rcu_dereference(geneve->sock4); 872 if (!gs4) 873 goto tx_error; 874 875 if (geneve->collect_md) { 876 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 877 netdev_dbg(dev, "no tunnel metadata\n"); 878 goto tx_error; 879 } 880 if (info && ip_tunnel_info_af(info) != AF_INET) 881 goto tx_error; 882 } 883 884 rt = geneve_get_v4_rt(skb, dev, &fl4, info); 885 if (IS_ERR(rt)) { 886 err = PTR_ERR(rt); 887 goto tx_error; 888 } 889 890 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 891 skb_reset_mac_header(skb); 892 893 iip = ip_hdr(skb); 894 895 if (info) { 896 const struct ip_tunnel_key *key = &info->key; 897 u8 *opts = NULL; 898 u8 vni[3]; 899 900 tunnel_id_to_vni(key->tun_id, vni); 901 if (info->options_len) 902 opts = ip_tunnel_info_opts(info); 903 904 if (key->tun_flags & TUNNEL_CSUM) 905 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX; 906 else 907 flags |= GENEVE_F_UDP_ZERO_CSUM_TX; 908 909 err = geneve_build_skb(rt, skb, key->tun_flags, vni, 910 info->options_len, opts, flags, xnet); 911 if (unlikely(err)) 912 goto tx_error; 913 914 tos = ip_tunnel_ecn_encap(key->tos, iip, skb); 915 ttl = key->ttl; 916 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 917 } else { 918 err = geneve_build_skb(rt, skb, 0, geneve->vni, 919 0, NULL, flags, xnet); 920 if (unlikely(err)) 921 goto tx_error; 922 923 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb); 924 ttl = geneve->ttl; 925 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr))) 926 ttl = 1; 927 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 928 df = 0; 929 } 930 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 931 tos, ttl, df, sport, geneve->dst_port, 932 !net_eq(geneve->net, dev_net(geneve->dev)), 933 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX)); 934 935 return NETDEV_TX_OK; 936 937 tx_error: 938 dev_kfree_skb(skb); 939 940 if (err == -ELOOP) 941 dev->stats.collisions++; 942 else if (err == -ENETUNREACH) 943 dev->stats.tx_carrier_errors++; 944 945 dev->stats.tx_errors++; 946 return NETDEV_TX_OK; 947 } 948 949 #if IS_ENABLED(CONFIG_IPV6) 950 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 951 struct ip_tunnel_info *info) 952 { 953 struct geneve_dev *geneve = netdev_priv(dev); 954 struct dst_entry *dst = NULL; 955 const struct iphdr *iip; /* interior IP header */ 956 struct geneve_sock *gs6; 957 int err = -EINVAL; 958 struct flowi6 fl6; 959 __u8 prio, ttl; 960 __be16 sport; 961 __be32 label; 962 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 963 u32 flags = geneve->flags; 964 965 gs6 = rcu_dereference(geneve->sock6); 966 if (!gs6) 967 goto tx_error; 968 969 if (geneve->collect_md) { 970 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 971 netdev_dbg(dev, "no tunnel metadata\n"); 972 goto tx_error; 973 } 974 } 975 976 dst = geneve_get_v6_dst(skb, dev, &fl6, info); 977 if (IS_ERR(dst)) { 978 err = PTR_ERR(dst); 979 goto tx_error; 980 } 981 982 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 983 skb_reset_mac_header(skb); 984 985 iip = ip_hdr(skb); 986 987 if (info) { 988 const struct ip_tunnel_key *key = &info->key; 989 u8 *opts = NULL; 990 u8 vni[3]; 991 992 tunnel_id_to_vni(key->tun_id, vni); 993 if (info->options_len) 994 opts = ip_tunnel_info_opts(info); 995 996 if (key->tun_flags & TUNNEL_CSUM) 997 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX; 998 else 999 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; 1000 1001 err = geneve6_build_skb(dst, skb, key->tun_flags, vni, 1002 info->options_len, opts, 1003 flags, xnet); 1004 if (unlikely(err)) 1005 goto tx_error; 1006 1007 prio = ip_tunnel_ecn_encap(key->tos, iip, skb); 1008 ttl = key->ttl; 1009 label = info->key.label; 1010 } else { 1011 err = geneve6_build_skb(dst, skb, 0, geneve->vni, 1012 0, NULL, flags, xnet); 1013 if (unlikely(err)) 1014 goto tx_error; 1015 1016 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1017 iip, skb); 1018 ttl = geneve->ttl; 1019 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr)) 1020 ttl = 1; 1021 ttl = ttl ? : ip6_dst_hoplimit(dst); 1022 label = geneve->label; 1023 } 1024 1025 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1026 &fl6.saddr, &fl6.daddr, prio, ttl, label, 1027 sport, geneve->dst_port, 1028 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX)); 1029 return NETDEV_TX_OK; 1030 1031 tx_error: 1032 dev_kfree_skb(skb); 1033 1034 if (err == -ELOOP) 1035 dev->stats.collisions++; 1036 else if (err == -ENETUNREACH) 1037 dev->stats.tx_carrier_errors++; 1038 1039 dev->stats.tx_errors++; 1040 return NETDEV_TX_OK; 1041 } 1042 #endif 1043 1044 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1045 { 1046 struct geneve_dev *geneve = netdev_priv(dev); 1047 struct ip_tunnel_info *info = NULL; 1048 1049 if (geneve->collect_md) 1050 info = skb_tunnel_info(skb); 1051 1052 #if IS_ENABLED(CONFIG_IPV6) 1053 if ((info && ip_tunnel_info_af(info) == AF_INET6) || 1054 (!info && geneve->remote.sa.sa_family == AF_INET6)) 1055 return geneve6_xmit_skb(skb, dev, info); 1056 #endif 1057 return geneve_xmit_skb(skb, dev, info); 1058 } 1059 1060 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict) 1061 { 1062 struct geneve_dev *geneve = netdev_priv(dev); 1063 /* The max_mtu calculation does not take account of GENEVE 1064 * options, to avoid excluding potentially valid 1065 * configurations. 1066 */ 1067 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1068 1069 if (geneve->remote.sa.sa_family == AF_INET6) 1070 max_mtu -= sizeof(struct ipv6hdr); 1071 else 1072 max_mtu -= sizeof(struct iphdr); 1073 1074 if (new_mtu < 68) 1075 return -EINVAL; 1076 1077 if (new_mtu > max_mtu) { 1078 if (strict) 1079 return -EINVAL; 1080 1081 new_mtu = max_mtu; 1082 } 1083 1084 dev->mtu = new_mtu; 1085 return 0; 1086 } 1087 1088 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1089 { 1090 return __geneve_change_mtu(dev, new_mtu, true); 1091 } 1092 1093 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1094 { 1095 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1096 struct geneve_dev *geneve = netdev_priv(dev); 1097 struct rtable *rt; 1098 struct flowi4 fl4; 1099 #if IS_ENABLED(CONFIG_IPV6) 1100 struct dst_entry *dst; 1101 struct flowi6 fl6; 1102 #endif 1103 1104 if (ip_tunnel_info_af(info) == AF_INET) { 1105 rt = geneve_get_v4_rt(skb, dev, &fl4, info); 1106 if (IS_ERR(rt)) 1107 return PTR_ERR(rt); 1108 1109 ip_rt_put(rt); 1110 info->key.u.ipv4.src = fl4.saddr; 1111 #if IS_ENABLED(CONFIG_IPV6) 1112 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1113 dst = geneve_get_v6_dst(skb, dev, &fl6, info); 1114 if (IS_ERR(dst)) 1115 return PTR_ERR(dst); 1116 1117 dst_release(dst); 1118 info->key.u.ipv6.src = fl6.saddr; 1119 #endif 1120 } else { 1121 return -EINVAL; 1122 } 1123 1124 info->key.tp_src = udp_flow_src_port(geneve->net, skb, 1125 1, USHRT_MAX, true); 1126 info->key.tp_dst = geneve->dst_port; 1127 return 0; 1128 } 1129 1130 static const struct net_device_ops geneve_netdev_ops = { 1131 .ndo_init = geneve_init, 1132 .ndo_uninit = geneve_uninit, 1133 .ndo_open = geneve_open, 1134 .ndo_stop = geneve_stop, 1135 .ndo_start_xmit = geneve_xmit, 1136 .ndo_get_stats64 = ip_tunnel_get_stats64, 1137 .ndo_change_mtu = geneve_change_mtu, 1138 .ndo_validate_addr = eth_validate_addr, 1139 .ndo_set_mac_address = eth_mac_addr, 1140 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1141 }; 1142 1143 static void geneve_get_drvinfo(struct net_device *dev, 1144 struct ethtool_drvinfo *drvinfo) 1145 { 1146 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1147 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1148 } 1149 1150 static const struct ethtool_ops geneve_ethtool_ops = { 1151 .get_drvinfo = geneve_get_drvinfo, 1152 .get_link = ethtool_op_get_link, 1153 }; 1154 1155 /* Info for udev, that this is a virtual tunnel endpoint */ 1156 static struct device_type geneve_type = { 1157 .name = "geneve", 1158 }; 1159 1160 /* Calls the ndo_udp_tunnel_add of the caller in order to 1161 * supply the listening GENEVE udp ports. Callers are expected 1162 * to implement the ndo_udp_tunnel_add. 1163 */ 1164 static void geneve_push_rx_ports(struct net_device *dev) 1165 { 1166 struct net *net = dev_net(dev); 1167 struct geneve_net *gn = net_generic(net, geneve_net_id); 1168 struct geneve_sock *gs; 1169 1170 rcu_read_lock(); 1171 list_for_each_entry_rcu(gs, &gn->sock_list, list) 1172 udp_tunnel_push_rx_port(dev, gs->sock, 1173 UDP_TUNNEL_TYPE_GENEVE); 1174 rcu_read_unlock(); 1175 } 1176 1177 /* Initialize the device structure. */ 1178 static void geneve_setup(struct net_device *dev) 1179 { 1180 ether_setup(dev); 1181 1182 dev->netdev_ops = &geneve_netdev_ops; 1183 dev->ethtool_ops = &geneve_ethtool_ops; 1184 dev->destructor = free_netdev; 1185 1186 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1187 1188 dev->features |= NETIF_F_LLTX; 1189 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1190 dev->features |= NETIF_F_RXCSUM; 1191 dev->features |= NETIF_F_GSO_SOFTWARE; 1192 1193 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 1194 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1195 1196 netif_keep_dst(dev); 1197 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1198 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1199 eth_hw_addr_random(dev); 1200 } 1201 1202 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1203 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1204 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, 1205 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1206 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1207 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1208 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1209 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1210 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1211 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1212 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1213 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1214 }; 1215 1216 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) 1217 { 1218 if (tb[IFLA_ADDRESS]) { 1219 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1220 return -EINVAL; 1221 1222 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1223 return -EADDRNOTAVAIL; 1224 } 1225 1226 if (!data) 1227 return -EINVAL; 1228 1229 if (data[IFLA_GENEVE_ID]) { 1230 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1231 1232 if (vni >= GENEVE_VID_MASK) 1233 return -ERANGE; 1234 } 1235 1236 return 0; 1237 } 1238 1239 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1240 __be16 dst_port, 1241 union geneve_addr *remote, 1242 u8 vni[], 1243 bool *tun_on_same_port, 1244 bool *tun_collect_md) 1245 { 1246 struct geneve_dev *geneve, *t; 1247 1248 *tun_on_same_port = false; 1249 *tun_collect_md = false; 1250 t = NULL; 1251 list_for_each_entry(geneve, &gn->geneve_list, next) { 1252 if (geneve->dst_port == dst_port) { 1253 *tun_collect_md = geneve->collect_md; 1254 *tun_on_same_port = true; 1255 } 1256 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && 1257 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) && 1258 dst_port == geneve->dst_port) 1259 t = geneve; 1260 } 1261 return t; 1262 } 1263 1264 static int geneve_configure(struct net *net, struct net_device *dev, 1265 union geneve_addr *remote, 1266 __u32 vni, __u8 ttl, __u8 tos, __be32 label, 1267 __be16 dst_port, bool metadata, u32 flags) 1268 { 1269 struct geneve_net *gn = net_generic(net, geneve_net_id); 1270 struct geneve_dev *t, *geneve = netdev_priv(dev); 1271 bool tun_collect_md, tun_on_same_port; 1272 int err, encap_len; 1273 1274 if (!remote) 1275 return -EINVAL; 1276 if (metadata && 1277 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label)) 1278 return -EINVAL; 1279 1280 geneve->net = net; 1281 geneve->dev = dev; 1282 1283 geneve->vni[0] = (vni & 0x00ff0000) >> 16; 1284 geneve->vni[1] = (vni & 0x0000ff00) >> 8; 1285 geneve->vni[2] = vni & 0x000000ff; 1286 1287 if ((remote->sa.sa_family == AF_INET && 1288 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) || 1289 (remote->sa.sa_family == AF_INET6 && 1290 ipv6_addr_is_multicast(&remote->sin6.sin6_addr))) 1291 return -EINVAL; 1292 if (label && remote->sa.sa_family != AF_INET6) 1293 return -EINVAL; 1294 1295 geneve->remote = *remote; 1296 1297 geneve->ttl = ttl; 1298 geneve->tos = tos; 1299 geneve->label = label; 1300 geneve->dst_port = dst_port; 1301 geneve->collect_md = metadata; 1302 geneve->flags = flags; 1303 1304 t = geneve_find_dev(gn, dst_port, remote, geneve->vni, 1305 &tun_on_same_port, &tun_collect_md); 1306 if (t) 1307 return -EBUSY; 1308 1309 /* make enough headroom for basic scenario */ 1310 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1311 if (remote->sa.sa_family == AF_INET) 1312 encap_len += sizeof(struct iphdr); 1313 else 1314 encap_len += sizeof(struct ipv6hdr); 1315 dev->needed_headroom = encap_len + ETH_HLEN; 1316 1317 if (metadata) { 1318 if (tun_on_same_port) 1319 return -EPERM; 1320 } else { 1321 if (tun_collect_md) 1322 return -EPERM; 1323 } 1324 1325 dst_cache_reset(&geneve->dst_cache); 1326 1327 err = register_netdevice(dev); 1328 if (err) 1329 return err; 1330 1331 list_add(&geneve->next, &gn->geneve_list); 1332 return 0; 1333 } 1334 1335 static int geneve_newlink(struct net *net, struct net_device *dev, 1336 struct nlattr *tb[], struct nlattr *data[]) 1337 { 1338 __be16 dst_port = htons(GENEVE_UDP_PORT); 1339 __u8 ttl = 0, tos = 0; 1340 bool metadata = false; 1341 union geneve_addr remote = geneve_remote_unspec; 1342 __be32 label = 0; 1343 __u32 vni = 0; 1344 u32 flags = 0; 1345 1346 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) 1347 return -EINVAL; 1348 1349 if (data[IFLA_GENEVE_REMOTE]) { 1350 remote.sa.sa_family = AF_INET; 1351 remote.sin.sin_addr.s_addr = 1352 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1353 } 1354 1355 if (data[IFLA_GENEVE_REMOTE6]) { 1356 if (!IS_ENABLED(CONFIG_IPV6)) 1357 return -EPFNOSUPPORT; 1358 1359 remote.sa.sa_family = AF_INET6; 1360 remote.sin6.sin6_addr = 1361 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1362 1363 if (ipv6_addr_type(&remote.sin6.sin6_addr) & 1364 IPV6_ADDR_LINKLOCAL) { 1365 netdev_dbg(dev, "link-local remote is unsupported\n"); 1366 return -EINVAL; 1367 } 1368 } 1369 1370 if (data[IFLA_GENEVE_ID]) 1371 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1372 1373 if (data[IFLA_GENEVE_TTL]) 1374 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1375 1376 if (data[IFLA_GENEVE_TOS]) 1377 tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1378 1379 if (data[IFLA_GENEVE_LABEL]) 1380 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1381 IPV6_FLOWLABEL_MASK; 1382 1383 if (data[IFLA_GENEVE_PORT]) 1384 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]); 1385 1386 if (data[IFLA_GENEVE_COLLECT_METADATA]) 1387 metadata = true; 1388 1389 if (data[IFLA_GENEVE_UDP_CSUM] && 1390 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1391 flags |= GENEVE_F_UDP_ZERO_CSUM_TX; 1392 1393 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] && 1394 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1395 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; 1396 1397 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] && 1398 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1399 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX; 1400 1401 return geneve_configure(net, dev, &remote, vni, ttl, tos, label, 1402 dst_port, metadata, flags); 1403 } 1404 1405 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1406 { 1407 struct geneve_dev *geneve = netdev_priv(dev); 1408 1409 list_del(&geneve->next); 1410 unregister_netdevice_queue(dev, head); 1411 } 1412 1413 static size_t geneve_get_size(const struct net_device *dev) 1414 { 1415 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1416 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1417 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1418 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1419 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1420 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1421 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1422 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1423 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1424 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1425 0; 1426 } 1427 1428 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1429 { 1430 struct geneve_dev *geneve = netdev_priv(dev); 1431 __u32 vni; 1432 1433 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2]; 1434 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1435 goto nla_put_failure; 1436 1437 if (geneve->remote.sa.sa_family == AF_INET) { 1438 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1439 geneve->remote.sin.sin_addr.s_addr)) 1440 goto nla_put_failure; 1441 #if IS_ENABLED(CONFIG_IPV6) 1442 } else { 1443 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1444 &geneve->remote.sin6.sin6_addr)) 1445 goto nla_put_failure; 1446 #endif 1447 } 1448 1449 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) || 1450 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) || 1451 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label)) 1452 goto nla_put_failure; 1453 1454 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port)) 1455 goto nla_put_failure; 1456 1457 if (geneve->collect_md) { 1458 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1459 goto nla_put_failure; 1460 } 1461 1462 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1463 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) || 1464 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1465 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) || 1466 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1467 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX))) 1468 goto nla_put_failure; 1469 1470 return 0; 1471 1472 nla_put_failure: 1473 return -EMSGSIZE; 1474 } 1475 1476 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1477 .kind = "geneve", 1478 .maxtype = IFLA_GENEVE_MAX, 1479 .policy = geneve_policy, 1480 .priv_size = sizeof(struct geneve_dev), 1481 .setup = geneve_setup, 1482 .validate = geneve_validate, 1483 .newlink = geneve_newlink, 1484 .dellink = geneve_dellink, 1485 .get_size = geneve_get_size, 1486 .fill_info = geneve_fill_info, 1487 }; 1488 1489 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1490 u8 name_assign_type, u16 dst_port) 1491 { 1492 struct nlattr *tb[IFLA_MAX + 1]; 1493 struct net_device *dev; 1494 LIST_HEAD(list_kill); 1495 int err; 1496 1497 memset(tb, 0, sizeof(tb)); 1498 dev = rtnl_create_link(net, name, name_assign_type, 1499 &geneve_link_ops, tb); 1500 if (IS_ERR(dev)) 1501 return dev; 1502 1503 err = geneve_configure(net, dev, &geneve_remote_unspec, 1504 0, 0, 0, 0, htons(dst_port), true, 1505 GENEVE_F_UDP_ZERO_CSUM6_RX); 1506 if (err) { 1507 free_netdev(dev); 1508 return ERR_PTR(err); 1509 } 1510 1511 /* openvswitch users expect packet sizes to be unrestricted, 1512 * so set the largest MTU we can. 1513 */ 1514 err = __geneve_change_mtu(dev, IP_MAX_MTU, false); 1515 if (err) 1516 goto err; 1517 1518 err = rtnl_configure_link(dev, NULL); 1519 if (err < 0) 1520 goto err; 1521 1522 return dev; 1523 1524 err: 1525 geneve_dellink(dev, &list_kill); 1526 unregister_netdevice_many(&list_kill); 1527 return ERR_PTR(err); 1528 } 1529 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1530 1531 static int geneve_netdevice_event(struct notifier_block *unused, 1532 unsigned long event, void *ptr) 1533 { 1534 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1535 1536 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1537 geneve_push_rx_ports(dev); 1538 1539 return NOTIFY_DONE; 1540 } 1541 1542 static struct notifier_block geneve_notifier_block __read_mostly = { 1543 .notifier_call = geneve_netdevice_event, 1544 }; 1545 1546 static __net_init int geneve_init_net(struct net *net) 1547 { 1548 struct geneve_net *gn = net_generic(net, geneve_net_id); 1549 1550 INIT_LIST_HEAD(&gn->geneve_list); 1551 INIT_LIST_HEAD(&gn->sock_list); 1552 return 0; 1553 } 1554 1555 static void __net_exit geneve_exit_net(struct net *net) 1556 { 1557 struct geneve_net *gn = net_generic(net, geneve_net_id); 1558 struct geneve_dev *geneve, *next; 1559 struct net_device *dev, *aux; 1560 LIST_HEAD(list); 1561 1562 rtnl_lock(); 1563 1564 /* gather any geneve devices that were moved into this ns */ 1565 for_each_netdev_safe(net, dev, aux) 1566 if (dev->rtnl_link_ops == &geneve_link_ops) 1567 unregister_netdevice_queue(dev, &list); 1568 1569 /* now gather any other geneve devices that were created in this ns */ 1570 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1571 /* If geneve->dev is in the same netns, it was already added 1572 * to the list by the previous loop. 1573 */ 1574 if (!net_eq(dev_net(geneve->dev), net)) 1575 unregister_netdevice_queue(geneve->dev, &list); 1576 } 1577 1578 /* unregister the devices gathered above */ 1579 unregister_netdevice_many(&list); 1580 rtnl_unlock(); 1581 } 1582 1583 static struct pernet_operations geneve_net_ops = { 1584 .init = geneve_init_net, 1585 .exit = geneve_exit_net, 1586 .id = &geneve_net_id, 1587 .size = sizeof(struct geneve_net), 1588 }; 1589 1590 static int __init geneve_init_module(void) 1591 { 1592 int rc; 1593 1594 rc = register_pernet_subsys(&geneve_net_ops); 1595 if (rc) 1596 goto out1; 1597 1598 rc = register_netdevice_notifier(&geneve_notifier_block); 1599 if (rc) 1600 goto out2; 1601 1602 rc = rtnl_link_register(&geneve_link_ops); 1603 if (rc) 1604 goto out3; 1605 1606 return 0; 1607 1608 out3: 1609 unregister_netdevice_notifier(&geneve_notifier_block); 1610 out2: 1611 unregister_pernet_subsys(&geneve_net_ops); 1612 out1: 1613 return rc; 1614 } 1615 late_initcall(geneve_init_module); 1616 1617 static void __exit geneve_cleanup_module(void) 1618 { 1619 rtnl_link_unregister(&geneve_link_ops); 1620 unregister_netdevice_notifier(&geneve_notifier_block); 1621 unregister_pernet_subsys(&geneve_net_ops); 1622 } 1623 module_exit(geneve_cleanup_module); 1624 1625 MODULE_LICENSE("GPL"); 1626 MODULE_VERSION(GENEVE_NETDEV_VER); 1627 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1628 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1629 MODULE_ALIAS_RTNL_LINK("geneve"); 1630