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/netdevice.h> 16 #include <linux/etherdevice.h> 17 #include <linux/hash.h> 18 #include <net/dst_metadata.h> 19 #include <net/gro_cells.h> 20 #include <net/rtnetlink.h> 21 #include <net/geneve.h> 22 #include <net/protocol.h> 23 24 #define GENEVE_NETDEV_VER "0.6" 25 26 #define GENEVE_UDP_PORT 6081 27 28 #define GENEVE_N_VID (1u << 24) 29 #define GENEVE_VID_MASK (GENEVE_N_VID - 1) 30 31 #define VNI_HASH_BITS 10 32 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 33 34 static bool log_ecn_error = true; 35 module_param(log_ecn_error, bool, 0644); 36 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 37 38 #define GENEVE_VER 0 39 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) 40 41 /* per-network namespace private data for this module */ 42 struct geneve_net { 43 struct list_head geneve_list; 44 struct list_head sock_list; 45 }; 46 47 static int geneve_net_id; 48 49 union geneve_addr { 50 struct sockaddr_in sin; 51 struct sockaddr_in6 sin6; 52 struct sockaddr sa; 53 }; 54 55 static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, }; 56 57 /* Pseudo network device */ 58 struct geneve_dev { 59 struct hlist_node hlist; /* vni hash table */ 60 struct net *net; /* netns for packet i/o */ 61 struct net_device *dev; /* netdev for geneve tunnel */ 62 struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */ 63 #if IS_ENABLED(CONFIG_IPV6) 64 struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */ 65 #endif 66 u8 vni[3]; /* virtual network ID for tunnel */ 67 u8 ttl; /* TTL override */ 68 u8 tos; /* TOS override */ 69 union geneve_addr remote; /* IP address for link partner */ 70 struct list_head next; /* geneve's per namespace list */ 71 __be32 label; /* IPv6 flowlabel override */ 72 __be16 dst_port; 73 bool collect_md; 74 struct gro_cells gro_cells; 75 u32 flags; 76 struct dst_cache dst_cache; 77 }; 78 79 /* Geneve device flags */ 80 #define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0) 81 #define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1) 82 #define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2) 83 84 struct geneve_sock { 85 bool collect_md; 86 struct list_head list; 87 struct socket *sock; 88 struct rcu_head rcu; 89 int refcnt; 90 struct udp_offload udp_offloads; 91 struct hlist_head vni_list[VNI_HASH_SIZE]; 92 u32 flags; 93 }; 94 95 static inline __u32 geneve_net_vni_hash(u8 vni[3]) 96 { 97 __u32 vnid; 98 99 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 100 return hash_32(vnid, VNI_HASH_BITS); 101 } 102 103 static __be64 vni_to_tunnel_id(const __u8 *vni) 104 { 105 #ifdef __BIG_ENDIAN 106 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 107 #else 108 return (__force __be64)(((__force u64)vni[0] << 40) | 109 ((__force u64)vni[1] << 48) | 110 ((__force u64)vni[2] << 56)); 111 #endif 112 } 113 114 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 115 { 116 return gs->sock->sk->sk_family; 117 } 118 119 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 120 __be32 addr, u8 vni[]) 121 { 122 struct hlist_head *vni_list_head; 123 struct geneve_dev *geneve; 124 __u32 hash; 125 126 /* Find the device for this VNI */ 127 hash = geneve_net_vni_hash(vni); 128 vni_list_head = &gs->vni_list[hash]; 129 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) { 130 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && 131 addr == geneve->remote.sin.sin_addr.s_addr) 132 return geneve; 133 } 134 return NULL; 135 } 136 137 #if IS_ENABLED(CONFIG_IPV6) 138 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 139 struct in6_addr addr6, u8 vni[]) 140 { 141 struct hlist_head *vni_list_head; 142 struct geneve_dev *geneve; 143 __u32 hash; 144 145 /* Find the device for this VNI */ 146 hash = geneve_net_vni_hash(vni); 147 vni_list_head = &gs->vni_list[hash]; 148 hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) { 149 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && 150 ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr)) 151 return geneve; 152 } 153 return NULL; 154 } 155 #endif 156 157 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 158 { 159 return (struct genevehdr *)(udp_hdr(skb) + 1); 160 } 161 162 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 163 struct sk_buff *skb) 164 { 165 u8 *vni; 166 __be32 addr; 167 static u8 zero_vni[3]; 168 #if IS_ENABLED(CONFIG_IPV6) 169 static struct in6_addr zero_addr6; 170 #endif 171 172 if (geneve_get_sk_family(gs) == AF_INET) { 173 struct iphdr *iph; 174 175 iph = ip_hdr(skb); /* outer IP header... */ 176 177 if (gs->collect_md) { 178 vni = zero_vni; 179 addr = 0; 180 } else { 181 vni = geneve_hdr(skb)->vni; 182 addr = iph->saddr; 183 } 184 185 return geneve_lookup(gs, addr, vni); 186 #if IS_ENABLED(CONFIG_IPV6) 187 } else if (geneve_get_sk_family(gs) == AF_INET6) { 188 struct ipv6hdr *ip6h; 189 struct in6_addr addr6; 190 191 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 192 193 if (gs->collect_md) { 194 vni = zero_vni; 195 addr6 = zero_addr6; 196 } else { 197 vni = geneve_hdr(skb)->vni; 198 addr6 = ip6h->saddr; 199 } 200 201 return geneve6_lookup(gs, addr6, vni); 202 #endif 203 } 204 return NULL; 205 } 206 207 /* geneve receive/decap routine */ 208 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 209 struct sk_buff *skb) 210 { 211 struct genevehdr *gnvh = geneve_hdr(skb); 212 struct metadata_dst *tun_dst = NULL; 213 struct pcpu_sw_netstats *stats; 214 int err = 0; 215 void *oiph; 216 217 if (ip_tunnel_collect_metadata() || gs->collect_md) { 218 __be16 flags; 219 220 flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | 221 (gnvh->oam ? TUNNEL_OAM : 0) | 222 (gnvh->critical ? TUNNEL_CRIT_OPT : 0); 223 224 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 225 vni_to_tunnel_id(gnvh->vni), 226 gnvh->opt_len * 4); 227 if (!tun_dst) 228 goto drop; 229 /* Update tunnel dst according to Geneve options. */ 230 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 231 gnvh->options, gnvh->opt_len * 4); 232 } else { 233 /* Drop packets w/ critical options, 234 * since we don't support any... 235 */ 236 if (gnvh->critical) 237 goto drop; 238 } 239 240 skb_reset_mac_header(skb); 241 skb->protocol = eth_type_trans(skb, geneve->dev); 242 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 243 244 if (tun_dst) 245 skb_dst_set(skb, &tun_dst->dst); 246 247 /* Ignore packet loops (and multicast echo) */ 248 if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) 249 goto drop; 250 251 oiph = skb_network_header(skb); 252 skb_reset_network_header(skb); 253 254 if (geneve_get_sk_family(gs) == AF_INET) 255 err = IP_ECN_decapsulate(oiph, skb); 256 #if IS_ENABLED(CONFIG_IPV6) 257 else 258 err = IP6_ECN_decapsulate(oiph, skb); 259 #endif 260 261 if (unlikely(err)) { 262 if (log_ecn_error) { 263 if (geneve_get_sk_family(gs) == AF_INET) 264 net_info_ratelimited("non-ECT from %pI4 " 265 "with TOS=%#x\n", 266 &((struct iphdr *)oiph)->saddr, 267 ((struct iphdr *)oiph)->tos); 268 #if IS_ENABLED(CONFIG_IPV6) 269 else 270 net_info_ratelimited("non-ECT from %pI6\n", 271 &((struct ipv6hdr *)oiph)->saddr); 272 #endif 273 } 274 if (err > 1) { 275 ++geneve->dev->stats.rx_frame_errors; 276 ++geneve->dev->stats.rx_errors; 277 goto drop; 278 } 279 } 280 281 stats = this_cpu_ptr(geneve->dev->tstats); 282 u64_stats_update_begin(&stats->syncp); 283 stats->rx_packets++; 284 stats->rx_bytes += skb->len; 285 u64_stats_update_end(&stats->syncp); 286 287 gro_cells_receive(&geneve->gro_cells, skb); 288 return; 289 drop: 290 /* Consume bad packet */ 291 kfree_skb(skb); 292 } 293 294 /* Setup stats when device is created */ 295 static int geneve_init(struct net_device *dev) 296 { 297 struct geneve_dev *geneve = netdev_priv(dev); 298 int err; 299 300 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 301 if (!dev->tstats) 302 return -ENOMEM; 303 304 err = gro_cells_init(&geneve->gro_cells, dev); 305 if (err) { 306 free_percpu(dev->tstats); 307 return err; 308 } 309 310 err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL); 311 if (err) { 312 free_percpu(dev->tstats); 313 gro_cells_destroy(&geneve->gro_cells); 314 return err; 315 } 316 317 return 0; 318 } 319 320 static void geneve_uninit(struct net_device *dev) 321 { 322 struct geneve_dev *geneve = netdev_priv(dev); 323 324 dst_cache_destroy(&geneve->dst_cache); 325 gro_cells_destroy(&geneve->gro_cells); 326 free_percpu(dev->tstats); 327 } 328 329 /* Callback from net/ipv4/udp.c to receive packets */ 330 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 331 { 332 struct genevehdr *geneveh; 333 struct geneve_dev *geneve; 334 struct geneve_sock *gs; 335 int opts_len; 336 337 /* Need Geneve and inner Ethernet header to be present */ 338 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 339 goto error; 340 341 /* Return packets with reserved bits set */ 342 geneveh = geneve_hdr(skb); 343 if (unlikely(geneveh->ver != GENEVE_VER)) 344 goto error; 345 346 if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) 347 goto error; 348 349 gs = rcu_dereference_sk_user_data(sk); 350 if (!gs) 351 goto drop; 352 353 geneve = geneve_lookup_skb(gs, skb); 354 if (!geneve) 355 goto drop; 356 357 opts_len = geneveh->opt_len * 4; 358 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, 359 htons(ETH_P_TEB), 360 !net_eq(geneve->net, dev_net(geneve->dev)))) 361 goto drop; 362 363 geneve_rx(geneve, gs, skb); 364 return 0; 365 366 drop: 367 /* Consume bad packet */ 368 kfree_skb(skb); 369 return 0; 370 371 error: 372 /* Let the UDP layer deal with the skb */ 373 return 1; 374 } 375 376 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 377 __be16 port, u32 flags) 378 { 379 struct socket *sock; 380 struct udp_port_cfg udp_conf; 381 int err; 382 383 memset(&udp_conf, 0, sizeof(udp_conf)); 384 385 if (ipv6) { 386 udp_conf.family = AF_INET6; 387 udp_conf.ipv6_v6only = 1; 388 udp_conf.use_udp6_rx_checksums = 389 !(flags & GENEVE_F_UDP_ZERO_CSUM6_RX); 390 } else { 391 udp_conf.family = AF_INET; 392 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 393 } 394 395 udp_conf.local_udp_port = port; 396 397 /* Open UDP socket */ 398 err = udp_sock_create(net, &udp_conf, &sock); 399 if (err < 0) 400 return ERR_PTR(err); 401 402 return sock; 403 } 404 405 static void geneve_notify_add_rx_port(struct geneve_sock *gs) 406 { 407 struct net_device *dev; 408 struct sock *sk = gs->sock->sk; 409 struct net *net = sock_net(sk); 410 sa_family_t sa_family = geneve_get_sk_family(gs); 411 __be16 port = inet_sk(sk)->inet_sport; 412 int err; 413 414 if (sa_family == AF_INET) { 415 err = udp_add_offload(sock_net(sk), &gs->udp_offloads); 416 if (err) 417 pr_warn("geneve: udp_add_offload failed with status %d\n", 418 err); 419 } 420 421 rcu_read_lock(); 422 for_each_netdev_rcu(net, dev) { 423 if (dev->netdev_ops->ndo_add_geneve_port) 424 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, 425 port); 426 } 427 rcu_read_unlock(); 428 } 429 430 static int geneve_hlen(struct genevehdr *gh) 431 { 432 return sizeof(*gh) + gh->opt_len * 4; 433 } 434 435 static struct sk_buff **geneve_gro_receive(struct sk_buff **head, 436 struct sk_buff *skb, 437 struct udp_offload *uoff) 438 { 439 struct sk_buff *p, **pp = NULL; 440 struct genevehdr *gh, *gh2; 441 unsigned int hlen, gh_len, off_gnv; 442 const struct packet_offload *ptype; 443 __be16 type; 444 int flush = 1; 445 446 off_gnv = skb_gro_offset(skb); 447 hlen = off_gnv + sizeof(*gh); 448 gh = skb_gro_header_fast(skb, off_gnv); 449 if (skb_gro_header_hard(skb, hlen)) { 450 gh = skb_gro_header_slow(skb, hlen, off_gnv); 451 if (unlikely(!gh)) 452 goto out; 453 } 454 455 if (gh->ver != GENEVE_VER || gh->oam) 456 goto out; 457 gh_len = geneve_hlen(gh); 458 459 hlen = off_gnv + gh_len; 460 if (skb_gro_header_hard(skb, hlen)) { 461 gh = skb_gro_header_slow(skb, hlen, off_gnv); 462 if (unlikely(!gh)) 463 goto out; 464 } 465 466 for (p = *head; p; p = p->next) { 467 if (!NAPI_GRO_CB(p)->same_flow) 468 continue; 469 470 gh2 = (struct genevehdr *)(p->data + off_gnv); 471 if (gh->opt_len != gh2->opt_len || 472 memcmp(gh, gh2, gh_len)) { 473 NAPI_GRO_CB(p)->same_flow = 0; 474 continue; 475 } 476 } 477 478 type = gh->proto_type; 479 480 rcu_read_lock(); 481 ptype = gro_find_receive_by_type(type); 482 if (!ptype) 483 goto out_unlock; 484 485 skb_gro_pull(skb, gh_len); 486 skb_gro_postpull_rcsum(skb, gh, gh_len); 487 pp = ptype->callbacks.gro_receive(head, skb); 488 flush = 0; 489 490 out_unlock: 491 rcu_read_unlock(); 492 out: 493 NAPI_GRO_CB(skb)->flush |= flush; 494 495 return pp; 496 } 497 498 static int geneve_gro_complete(struct sk_buff *skb, int nhoff, 499 struct udp_offload *uoff) 500 { 501 struct genevehdr *gh; 502 struct packet_offload *ptype; 503 __be16 type; 504 int gh_len; 505 int err = -ENOSYS; 506 507 udp_tunnel_gro_complete(skb, nhoff); 508 509 gh = (struct genevehdr *)(skb->data + nhoff); 510 gh_len = geneve_hlen(gh); 511 type = gh->proto_type; 512 513 rcu_read_lock(); 514 ptype = gro_find_complete_by_type(type); 515 if (ptype) 516 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 517 518 rcu_read_unlock(); 519 return err; 520 } 521 522 /* Create new listen socket if needed */ 523 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 524 bool ipv6, u32 flags) 525 { 526 struct geneve_net *gn = net_generic(net, geneve_net_id); 527 struct geneve_sock *gs; 528 struct socket *sock; 529 struct udp_tunnel_sock_cfg tunnel_cfg; 530 int h; 531 532 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 533 if (!gs) 534 return ERR_PTR(-ENOMEM); 535 536 sock = geneve_create_sock(net, ipv6, port, flags); 537 if (IS_ERR(sock)) { 538 kfree(gs); 539 return ERR_CAST(sock); 540 } 541 542 gs->sock = sock; 543 gs->refcnt = 1; 544 for (h = 0; h < VNI_HASH_SIZE; ++h) 545 INIT_HLIST_HEAD(&gs->vni_list[h]); 546 547 /* Initialize the geneve udp offloads structure */ 548 gs->udp_offloads.port = port; 549 gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive; 550 gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete; 551 geneve_notify_add_rx_port(gs); 552 553 /* Mark socket as an encapsulation socket */ 554 tunnel_cfg.sk_user_data = gs; 555 tunnel_cfg.encap_type = 1; 556 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 557 tunnel_cfg.encap_destroy = NULL; 558 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 559 list_add(&gs->list, &gn->sock_list); 560 return gs; 561 } 562 563 static void geneve_notify_del_rx_port(struct geneve_sock *gs) 564 { 565 struct net_device *dev; 566 struct sock *sk = gs->sock->sk; 567 struct net *net = sock_net(sk); 568 sa_family_t sa_family = geneve_get_sk_family(gs); 569 __be16 port = inet_sk(sk)->inet_sport; 570 571 rcu_read_lock(); 572 for_each_netdev_rcu(net, dev) { 573 if (dev->netdev_ops->ndo_del_geneve_port) 574 dev->netdev_ops->ndo_del_geneve_port(dev, sa_family, 575 port); 576 } 577 578 rcu_read_unlock(); 579 580 if (sa_family == AF_INET) 581 udp_del_offload(&gs->udp_offloads); 582 } 583 584 static void __geneve_sock_release(struct geneve_sock *gs) 585 { 586 if (!gs || --gs->refcnt) 587 return; 588 589 list_del(&gs->list); 590 geneve_notify_del_rx_port(gs); 591 udp_tunnel_sock_release(gs->sock); 592 kfree_rcu(gs, rcu); 593 } 594 595 static void geneve_sock_release(struct geneve_dev *geneve) 596 { 597 __geneve_sock_release(geneve->sock4); 598 #if IS_ENABLED(CONFIG_IPV6) 599 __geneve_sock_release(geneve->sock6); 600 #endif 601 } 602 603 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 604 sa_family_t family, 605 __be16 dst_port) 606 { 607 struct geneve_sock *gs; 608 609 list_for_each_entry(gs, &gn->sock_list, list) { 610 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 611 geneve_get_sk_family(gs) == family) { 612 return gs; 613 } 614 } 615 return NULL; 616 } 617 618 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 619 { 620 struct net *net = geneve->net; 621 struct geneve_net *gn = net_generic(net, geneve_net_id); 622 struct geneve_sock *gs; 623 __u32 hash; 624 625 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port); 626 if (gs) { 627 gs->refcnt++; 628 goto out; 629 } 630 631 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags); 632 if (IS_ERR(gs)) 633 return PTR_ERR(gs); 634 635 out: 636 gs->collect_md = geneve->collect_md; 637 gs->flags = geneve->flags; 638 #if IS_ENABLED(CONFIG_IPV6) 639 if (ipv6) 640 geneve->sock6 = gs; 641 else 642 #endif 643 geneve->sock4 = gs; 644 645 hash = geneve_net_vni_hash(geneve->vni); 646 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]); 647 return 0; 648 } 649 650 static int geneve_open(struct net_device *dev) 651 { 652 struct geneve_dev *geneve = netdev_priv(dev); 653 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6; 654 bool metadata = geneve->collect_md; 655 int ret = 0; 656 657 geneve->sock4 = NULL; 658 #if IS_ENABLED(CONFIG_IPV6) 659 geneve->sock6 = NULL; 660 if (ipv6 || metadata) 661 ret = geneve_sock_add(geneve, true); 662 #endif 663 if (!ret && (!ipv6 || metadata)) 664 ret = geneve_sock_add(geneve, false); 665 if (ret < 0) 666 geneve_sock_release(geneve); 667 668 return ret; 669 } 670 671 static int geneve_stop(struct net_device *dev) 672 { 673 struct geneve_dev *geneve = netdev_priv(dev); 674 675 if (!hlist_unhashed(&geneve->hlist)) 676 hlist_del_rcu(&geneve->hlist); 677 geneve_sock_release(geneve); 678 return 0; 679 } 680 681 static void geneve_build_header(struct genevehdr *geneveh, 682 __be16 tun_flags, u8 vni[3], 683 u8 options_len, u8 *options) 684 { 685 geneveh->ver = GENEVE_VER; 686 geneveh->opt_len = options_len / 4; 687 geneveh->oam = !!(tun_flags & TUNNEL_OAM); 688 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT); 689 geneveh->rsvd1 = 0; 690 memcpy(geneveh->vni, vni, 3); 691 geneveh->proto_type = htons(ETH_P_TEB); 692 geneveh->rsvd2 = 0; 693 694 memcpy(geneveh->options, options, options_len); 695 } 696 697 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb, 698 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, 699 u32 flags, bool xnet) 700 { 701 struct genevehdr *gnvh; 702 int min_headroom; 703 int err; 704 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX); 705 706 skb_scrub_packet(skb, xnet); 707 708 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len 709 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr); 710 err = skb_cow_head(skb, min_headroom); 711 if (unlikely(err)) { 712 kfree_skb(skb); 713 goto free_rt; 714 } 715 716 skb = udp_tunnel_handle_offloads(skb, udp_sum); 717 if (IS_ERR(skb)) { 718 err = PTR_ERR(skb); 719 goto free_rt; 720 } 721 722 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); 723 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); 724 725 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 726 return 0; 727 728 free_rt: 729 ip_rt_put(rt); 730 return err; 731 } 732 733 #if IS_ENABLED(CONFIG_IPV6) 734 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb, 735 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, 736 u32 flags, bool xnet) 737 { 738 struct genevehdr *gnvh; 739 int min_headroom; 740 int err; 741 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX); 742 743 skb_scrub_packet(skb, xnet); 744 745 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 746 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr); 747 err = skb_cow_head(skb, min_headroom); 748 if (unlikely(err)) { 749 kfree_skb(skb); 750 goto free_dst; 751 } 752 753 skb = udp_tunnel_handle_offloads(skb, udp_sum); 754 if (IS_ERR(skb)) { 755 err = PTR_ERR(skb); 756 goto free_dst; 757 } 758 759 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); 760 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); 761 762 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 763 return 0; 764 765 free_dst: 766 dst_release(dst); 767 return err; 768 } 769 #endif 770 771 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 772 struct net_device *dev, 773 struct flowi4 *fl4, 774 struct ip_tunnel_info *info) 775 { 776 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 777 struct geneve_dev *geneve = netdev_priv(dev); 778 struct dst_cache *dst_cache; 779 struct rtable *rt = NULL; 780 __u8 tos; 781 782 memset(fl4, 0, sizeof(*fl4)); 783 fl4->flowi4_mark = skb->mark; 784 fl4->flowi4_proto = IPPROTO_UDP; 785 786 if (info) { 787 fl4->daddr = info->key.u.ipv4.dst; 788 fl4->saddr = info->key.u.ipv4.src; 789 fl4->flowi4_tos = RT_TOS(info->key.tos); 790 dst_cache = &info->dst_cache; 791 } else { 792 tos = geneve->tos; 793 if (tos == 1) { 794 const struct iphdr *iip = ip_hdr(skb); 795 796 tos = ip_tunnel_get_dsfield(iip, skb); 797 use_cache = false; 798 } 799 800 fl4->flowi4_tos = RT_TOS(tos); 801 fl4->daddr = geneve->remote.sin.sin_addr.s_addr; 802 dst_cache = &geneve->dst_cache; 803 } 804 805 if (use_cache) { 806 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 807 if (rt) 808 return rt; 809 } 810 811 rt = ip_route_output_key(geneve->net, fl4); 812 if (IS_ERR(rt)) { 813 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 814 return ERR_PTR(-ENETUNREACH); 815 } 816 if (rt->dst.dev == dev) { /* is this necessary? */ 817 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 818 ip_rt_put(rt); 819 return ERR_PTR(-ELOOP); 820 } 821 if (use_cache) 822 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 823 return rt; 824 } 825 826 #if IS_ENABLED(CONFIG_IPV6) 827 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 828 struct net_device *dev, 829 struct flowi6 *fl6, 830 struct ip_tunnel_info *info) 831 { 832 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 833 struct geneve_dev *geneve = netdev_priv(dev); 834 struct geneve_sock *gs6 = geneve->sock6; 835 struct dst_entry *dst = NULL; 836 struct dst_cache *dst_cache; 837 __u8 prio; 838 839 memset(fl6, 0, sizeof(*fl6)); 840 fl6->flowi6_mark = skb->mark; 841 fl6->flowi6_proto = IPPROTO_UDP; 842 843 if (info) { 844 fl6->daddr = info->key.u.ipv6.dst; 845 fl6->saddr = info->key.u.ipv6.src; 846 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos), 847 info->key.label); 848 dst_cache = &info->dst_cache; 849 } else { 850 prio = geneve->tos; 851 if (prio == 1) { 852 const struct iphdr *iip = ip_hdr(skb); 853 854 prio = ip_tunnel_get_dsfield(iip, skb); 855 use_cache = false; 856 } 857 858 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 859 geneve->label); 860 fl6->daddr = geneve->remote.sin6.sin6_addr; 861 dst_cache = &geneve->dst_cache; 862 } 863 864 if (use_cache) { 865 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 866 if (dst) 867 return dst; 868 } 869 870 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) { 871 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 872 return ERR_PTR(-ENETUNREACH); 873 } 874 if (dst->dev == dev) { /* is this necessary? */ 875 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 876 dst_release(dst); 877 return ERR_PTR(-ELOOP); 878 } 879 880 if (use_cache) 881 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 882 return dst; 883 } 884 #endif 885 886 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 887 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 888 { 889 #ifdef __BIG_ENDIAN 890 vni[0] = (__force __u8)(tun_id >> 16); 891 vni[1] = (__force __u8)(tun_id >> 8); 892 vni[2] = (__force __u8)tun_id; 893 #else 894 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 895 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 896 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 897 #endif 898 } 899 900 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 901 struct ip_tunnel_info *info) 902 { 903 struct geneve_dev *geneve = netdev_priv(dev); 904 struct geneve_sock *gs4 = geneve->sock4; 905 struct rtable *rt = NULL; 906 const struct iphdr *iip; /* interior IP header */ 907 int err = -EINVAL; 908 struct flowi4 fl4; 909 __u8 tos, ttl; 910 __be16 sport; 911 __be16 df; 912 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 913 u32 flags = geneve->flags; 914 915 if (geneve->collect_md) { 916 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 917 netdev_dbg(dev, "no tunnel metadata\n"); 918 goto tx_error; 919 } 920 if (info && ip_tunnel_info_af(info) != AF_INET) 921 goto tx_error; 922 } 923 924 rt = geneve_get_v4_rt(skb, dev, &fl4, info); 925 if (IS_ERR(rt)) { 926 err = PTR_ERR(rt); 927 goto tx_error; 928 } 929 930 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 931 skb_reset_mac_header(skb); 932 933 iip = ip_hdr(skb); 934 935 if (info) { 936 const struct ip_tunnel_key *key = &info->key; 937 u8 *opts = NULL; 938 u8 vni[3]; 939 940 tunnel_id_to_vni(key->tun_id, vni); 941 if (info->options_len) 942 opts = ip_tunnel_info_opts(info); 943 944 if (key->tun_flags & TUNNEL_CSUM) 945 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX; 946 else 947 flags |= GENEVE_F_UDP_ZERO_CSUM_TX; 948 949 err = geneve_build_skb(rt, skb, key->tun_flags, vni, 950 info->options_len, opts, flags, xnet); 951 if (unlikely(err)) 952 goto err; 953 954 tos = ip_tunnel_ecn_encap(key->tos, iip, skb); 955 ttl = key->ttl; 956 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 957 } else { 958 err = geneve_build_skb(rt, skb, 0, geneve->vni, 959 0, NULL, flags, xnet); 960 if (unlikely(err)) 961 goto err; 962 963 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb); 964 ttl = geneve->ttl; 965 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr))) 966 ttl = 1; 967 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 968 df = 0; 969 } 970 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 971 tos, ttl, df, sport, geneve->dst_port, 972 !net_eq(geneve->net, dev_net(geneve->dev)), 973 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX)); 974 975 return NETDEV_TX_OK; 976 977 tx_error: 978 dev_kfree_skb(skb); 979 err: 980 if (err == -ELOOP) 981 dev->stats.collisions++; 982 else if (err == -ENETUNREACH) 983 dev->stats.tx_carrier_errors++; 984 else 985 dev->stats.tx_errors++; 986 return NETDEV_TX_OK; 987 } 988 989 #if IS_ENABLED(CONFIG_IPV6) 990 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 991 struct ip_tunnel_info *info) 992 { 993 struct geneve_dev *geneve = netdev_priv(dev); 994 struct geneve_sock *gs6 = geneve->sock6; 995 struct dst_entry *dst = NULL; 996 const struct iphdr *iip; /* interior IP header */ 997 int err = -EINVAL; 998 struct flowi6 fl6; 999 __u8 prio, ttl; 1000 __be16 sport; 1001 __be32 label; 1002 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 1003 u32 flags = geneve->flags; 1004 1005 if (geneve->collect_md) { 1006 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1007 netdev_dbg(dev, "no tunnel metadata\n"); 1008 goto tx_error; 1009 } 1010 } 1011 1012 dst = geneve_get_v6_dst(skb, dev, &fl6, info); 1013 if (IS_ERR(dst)) { 1014 err = PTR_ERR(dst); 1015 goto tx_error; 1016 } 1017 1018 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 1019 skb_reset_mac_header(skb); 1020 1021 iip = ip_hdr(skb); 1022 1023 if (info) { 1024 const struct ip_tunnel_key *key = &info->key; 1025 u8 *opts = NULL; 1026 u8 vni[3]; 1027 1028 tunnel_id_to_vni(key->tun_id, vni); 1029 if (info->options_len) 1030 opts = ip_tunnel_info_opts(info); 1031 1032 if (key->tun_flags & TUNNEL_CSUM) 1033 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX; 1034 else 1035 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; 1036 1037 err = geneve6_build_skb(dst, skb, key->tun_flags, vni, 1038 info->options_len, opts, 1039 flags, xnet); 1040 if (unlikely(err)) 1041 goto err; 1042 1043 prio = ip_tunnel_ecn_encap(key->tos, iip, skb); 1044 ttl = key->ttl; 1045 label = info->key.label; 1046 } else { 1047 err = geneve6_build_skb(dst, skb, 0, geneve->vni, 1048 0, NULL, flags, xnet); 1049 if (unlikely(err)) 1050 goto err; 1051 1052 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1053 iip, skb); 1054 ttl = geneve->ttl; 1055 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr)) 1056 ttl = 1; 1057 ttl = ttl ? : ip6_dst_hoplimit(dst); 1058 label = geneve->label; 1059 } 1060 1061 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1062 &fl6.saddr, &fl6.daddr, prio, ttl, label, 1063 sport, geneve->dst_port, 1064 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX)); 1065 return NETDEV_TX_OK; 1066 1067 tx_error: 1068 dev_kfree_skb(skb); 1069 err: 1070 if (err == -ELOOP) 1071 dev->stats.collisions++; 1072 else if (err == -ENETUNREACH) 1073 dev->stats.tx_carrier_errors++; 1074 else 1075 dev->stats.tx_errors++; 1076 return NETDEV_TX_OK; 1077 } 1078 #endif 1079 1080 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1081 { 1082 struct geneve_dev *geneve = netdev_priv(dev); 1083 struct ip_tunnel_info *info = NULL; 1084 1085 if (geneve->collect_md) 1086 info = skb_tunnel_info(skb); 1087 1088 #if IS_ENABLED(CONFIG_IPV6) 1089 if ((info && ip_tunnel_info_af(info) == AF_INET6) || 1090 (!info && geneve->remote.sa.sa_family == AF_INET6)) 1091 return geneve6_xmit_skb(skb, dev, info); 1092 #endif 1093 return geneve_xmit_skb(skb, dev, info); 1094 } 1095 1096 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict) 1097 { 1098 /* The max_mtu calculation does not take account of GENEVE 1099 * options, to avoid excluding potentially valid 1100 * configurations. 1101 */ 1102 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr) 1103 - dev->hard_header_len; 1104 1105 if (new_mtu < 68) 1106 return -EINVAL; 1107 1108 if (new_mtu > max_mtu) { 1109 if (strict) 1110 return -EINVAL; 1111 1112 new_mtu = max_mtu; 1113 } 1114 1115 dev->mtu = new_mtu; 1116 return 0; 1117 } 1118 1119 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1120 { 1121 return __geneve_change_mtu(dev, new_mtu, true); 1122 } 1123 1124 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1125 { 1126 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1127 struct geneve_dev *geneve = netdev_priv(dev); 1128 struct rtable *rt; 1129 struct flowi4 fl4; 1130 #if IS_ENABLED(CONFIG_IPV6) 1131 struct dst_entry *dst; 1132 struct flowi6 fl6; 1133 #endif 1134 1135 if (ip_tunnel_info_af(info) == AF_INET) { 1136 rt = geneve_get_v4_rt(skb, dev, &fl4, info); 1137 if (IS_ERR(rt)) 1138 return PTR_ERR(rt); 1139 1140 ip_rt_put(rt); 1141 info->key.u.ipv4.src = fl4.saddr; 1142 #if IS_ENABLED(CONFIG_IPV6) 1143 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1144 dst = geneve_get_v6_dst(skb, dev, &fl6, info); 1145 if (IS_ERR(dst)) 1146 return PTR_ERR(dst); 1147 1148 dst_release(dst); 1149 info->key.u.ipv6.src = fl6.saddr; 1150 #endif 1151 } else { 1152 return -EINVAL; 1153 } 1154 1155 info->key.tp_src = udp_flow_src_port(geneve->net, skb, 1156 1, USHRT_MAX, true); 1157 info->key.tp_dst = geneve->dst_port; 1158 return 0; 1159 } 1160 1161 static const struct net_device_ops geneve_netdev_ops = { 1162 .ndo_init = geneve_init, 1163 .ndo_uninit = geneve_uninit, 1164 .ndo_open = geneve_open, 1165 .ndo_stop = geneve_stop, 1166 .ndo_start_xmit = geneve_xmit, 1167 .ndo_get_stats64 = ip_tunnel_get_stats64, 1168 .ndo_change_mtu = geneve_change_mtu, 1169 .ndo_validate_addr = eth_validate_addr, 1170 .ndo_set_mac_address = eth_mac_addr, 1171 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1172 }; 1173 1174 static void geneve_get_drvinfo(struct net_device *dev, 1175 struct ethtool_drvinfo *drvinfo) 1176 { 1177 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1178 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1179 } 1180 1181 static const struct ethtool_ops geneve_ethtool_ops = { 1182 .get_drvinfo = geneve_get_drvinfo, 1183 .get_link = ethtool_op_get_link, 1184 }; 1185 1186 /* Info for udev, that this is a virtual tunnel endpoint */ 1187 static struct device_type geneve_type = { 1188 .name = "geneve", 1189 }; 1190 1191 /* Calls the ndo_add_geneve_port of the caller in order to 1192 * supply the listening GENEVE udp ports. Callers are expected 1193 * to implement the ndo_add_geneve_port. 1194 */ 1195 void geneve_get_rx_port(struct net_device *dev) 1196 { 1197 struct net *net = dev_net(dev); 1198 struct geneve_net *gn = net_generic(net, geneve_net_id); 1199 struct geneve_sock *gs; 1200 sa_family_t sa_family; 1201 struct sock *sk; 1202 __be16 port; 1203 1204 rcu_read_lock(); 1205 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1206 sk = gs->sock->sk; 1207 sa_family = sk->sk_family; 1208 port = inet_sk(sk)->inet_sport; 1209 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port); 1210 } 1211 rcu_read_unlock(); 1212 } 1213 EXPORT_SYMBOL_GPL(geneve_get_rx_port); 1214 1215 /* Initialize the device structure. */ 1216 static void geneve_setup(struct net_device *dev) 1217 { 1218 ether_setup(dev); 1219 1220 dev->netdev_ops = &geneve_netdev_ops; 1221 dev->ethtool_ops = &geneve_ethtool_ops; 1222 dev->destructor = free_netdev; 1223 1224 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1225 1226 dev->features |= NETIF_F_LLTX; 1227 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1228 dev->features |= NETIF_F_RXCSUM; 1229 dev->features |= NETIF_F_GSO_SOFTWARE; 1230 1231 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 1232 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1233 1234 netif_keep_dst(dev); 1235 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1236 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1237 eth_hw_addr_random(dev); 1238 } 1239 1240 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1241 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1242 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, 1243 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1244 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1245 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1246 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1247 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1248 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1249 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1250 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1251 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1252 }; 1253 1254 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) 1255 { 1256 if (tb[IFLA_ADDRESS]) { 1257 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1258 return -EINVAL; 1259 1260 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1261 return -EADDRNOTAVAIL; 1262 } 1263 1264 if (!data) 1265 return -EINVAL; 1266 1267 if (data[IFLA_GENEVE_ID]) { 1268 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1269 1270 if (vni >= GENEVE_VID_MASK) 1271 return -ERANGE; 1272 } 1273 1274 return 0; 1275 } 1276 1277 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1278 __be16 dst_port, 1279 union geneve_addr *remote, 1280 u8 vni[], 1281 bool *tun_on_same_port, 1282 bool *tun_collect_md) 1283 { 1284 struct geneve_dev *geneve, *t; 1285 1286 *tun_on_same_port = false; 1287 *tun_collect_md = false; 1288 t = NULL; 1289 list_for_each_entry(geneve, &gn->geneve_list, next) { 1290 if (geneve->dst_port == dst_port) { 1291 *tun_collect_md = geneve->collect_md; 1292 *tun_on_same_port = true; 1293 } 1294 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && 1295 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) && 1296 dst_port == geneve->dst_port) 1297 t = geneve; 1298 } 1299 return t; 1300 } 1301 1302 static int geneve_configure(struct net *net, struct net_device *dev, 1303 union geneve_addr *remote, 1304 __u32 vni, __u8 ttl, __u8 tos, __be32 label, 1305 __be16 dst_port, bool metadata, u32 flags) 1306 { 1307 struct geneve_net *gn = net_generic(net, geneve_net_id); 1308 struct geneve_dev *t, *geneve = netdev_priv(dev); 1309 bool tun_collect_md, tun_on_same_port; 1310 int err, encap_len; 1311 1312 if (!remote) 1313 return -EINVAL; 1314 if (metadata && 1315 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label)) 1316 return -EINVAL; 1317 1318 geneve->net = net; 1319 geneve->dev = dev; 1320 1321 geneve->vni[0] = (vni & 0x00ff0000) >> 16; 1322 geneve->vni[1] = (vni & 0x0000ff00) >> 8; 1323 geneve->vni[2] = vni & 0x000000ff; 1324 1325 if ((remote->sa.sa_family == AF_INET && 1326 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) || 1327 (remote->sa.sa_family == AF_INET6 && 1328 ipv6_addr_is_multicast(&remote->sin6.sin6_addr))) 1329 return -EINVAL; 1330 if (label && remote->sa.sa_family != AF_INET6) 1331 return -EINVAL; 1332 1333 geneve->remote = *remote; 1334 1335 geneve->ttl = ttl; 1336 geneve->tos = tos; 1337 geneve->label = label; 1338 geneve->dst_port = dst_port; 1339 geneve->collect_md = metadata; 1340 geneve->flags = flags; 1341 1342 t = geneve_find_dev(gn, dst_port, remote, geneve->vni, 1343 &tun_on_same_port, &tun_collect_md); 1344 if (t) 1345 return -EBUSY; 1346 1347 /* make enough headroom for basic scenario */ 1348 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1349 if (remote->sa.sa_family == AF_INET) 1350 encap_len += sizeof(struct iphdr); 1351 else 1352 encap_len += sizeof(struct ipv6hdr); 1353 dev->needed_headroom = encap_len + ETH_HLEN; 1354 1355 if (metadata) { 1356 if (tun_on_same_port) 1357 return -EPERM; 1358 } else { 1359 if (tun_collect_md) 1360 return -EPERM; 1361 } 1362 1363 dst_cache_reset(&geneve->dst_cache); 1364 1365 err = register_netdevice(dev); 1366 if (err) 1367 return err; 1368 1369 list_add(&geneve->next, &gn->geneve_list); 1370 return 0; 1371 } 1372 1373 static int geneve_newlink(struct net *net, struct net_device *dev, 1374 struct nlattr *tb[], struct nlattr *data[]) 1375 { 1376 __be16 dst_port = htons(GENEVE_UDP_PORT); 1377 __u8 ttl = 0, tos = 0; 1378 bool metadata = false; 1379 union geneve_addr remote = geneve_remote_unspec; 1380 __be32 label = 0; 1381 __u32 vni = 0; 1382 u32 flags = 0; 1383 1384 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) 1385 return -EINVAL; 1386 1387 if (data[IFLA_GENEVE_REMOTE]) { 1388 remote.sa.sa_family = AF_INET; 1389 remote.sin.sin_addr.s_addr = 1390 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1391 } 1392 1393 if (data[IFLA_GENEVE_REMOTE6]) { 1394 if (!IS_ENABLED(CONFIG_IPV6)) 1395 return -EPFNOSUPPORT; 1396 1397 remote.sa.sa_family = AF_INET6; 1398 remote.sin6.sin6_addr = 1399 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1400 1401 if (ipv6_addr_type(&remote.sin6.sin6_addr) & 1402 IPV6_ADDR_LINKLOCAL) { 1403 netdev_dbg(dev, "link-local remote is unsupported\n"); 1404 return -EINVAL; 1405 } 1406 } 1407 1408 if (data[IFLA_GENEVE_ID]) 1409 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1410 1411 if (data[IFLA_GENEVE_TTL]) 1412 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1413 1414 if (data[IFLA_GENEVE_TOS]) 1415 tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1416 1417 if (data[IFLA_GENEVE_LABEL]) 1418 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1419 IPV6_FLOWLABEL_MASK; 1420 1421 if (data[IFLA_GENEVE_PORT]) 1422 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]); 1423 1424 if (data[IFLA_GENEVE_COLLECT_METADATA]) 1425 metadata = true; 1426 1427 if (data[IFLA_GENEVE_UDP_CSUM] && 1428 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1429 flags |= GENEVE_F_UDP_ZERO_CSUM_TX; 1430 1431 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] && 1432 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1433 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; 1434 1435 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] && 1436 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1437 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX; 1438 1439 return geneve_configure(net, dev, &remote, vni, ttl, tos, label, 1440 dst_port, metadata, flags); 1441 } 1442 1443 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1444 { 1445 struct geneve_dev *geneve = netdev_priv(dev); 1446 1447 list_del(&geneve->next); 1448 unregister_netdevice_queue(dev, head); 1449 } 1450 1451 static size_t geneve_get_size(const struct net_device *dev) 1452 { 1453 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1454 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1455 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1456 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1457 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1458 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1459 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1460 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1461 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1462 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1463 0; 1464 } 1465 1466 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1467 { 1468 struct geneve_dev *geneve = netdev_priv(dev); 1469 __u32 vni; 1470 1471 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2]; 1472 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1473 goto nla_put_failure; 1474 1475 if (geneve->remote.sa.sa_family == AF_INET) { 1476 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1477 geneve->remote.sin.sin_addr.s_addr)) 1478 goto nla_put_failure; 1479 #if IS_ENABLED(CONFIG_IPV6) 1480 } else { 1481 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1482 &geneve->remote.sin6.sin6_addr)) 1483 goto nla_put_failure; 1484 #endif 1485 } 1486 1487 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) || 1488 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) || 1489 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label)) 1490 goto nla_put_failure; 1491 1492 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port)) 1493 goto nla_put_failure; 1494 1495 if (geneve->collect_md) { 1496 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1497 goto nla_put_failure; 1498 } 1499 1500 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1501 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) || 1502 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1503 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) || 1504 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1505 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX))) 1506 goto nla_put_failure; 1507 1508 return 0; 1509 1510 nla_put_failure: 1511 return -EMSGSIZE; 1512 } 1513 1514 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1515 .kind = "geneve", 1516 .maxtype = IFLA_GENEVE_MAX, 1517 .policy = geneve_policy, 1518 .priv_size = sizeof(struct geneve_dev), 1519 .setup = geneve_setup, 1520 .validate = geneve_validate, 1521 .newlink = geneve_newlink, 1522 .dellink = geneve_dellink, 1523 .get_size = geneve_get_size, 1524 .fill_info = geneve_fill_info, 1525 }; 1526 1527 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1528 u8 name_assign_type, u16 dst_port) 1529 { 1530 struct nlattr *tb[IFLA_MAX + 1]; 1531 struct net_device *dev; 1532 int err; 1533 1534 memset(tb, 0, sizeof(tb)); 1535 dev = rtnl_create_link(net, name, name_assign_type, 1536 &geneve_link_ops, tb); 1537 if (IS_ERR(dev)) 1538 return dev; 1539 1540 err = geneve_configure(net, dev, &geneve_remote_unspec, 1541 0, 0, 0, 0, htons(dst_port), true, 1542 GENEVE_F_UDP_ZERO_CSUM6_RX); 1543 if (err) 1544 goto err; 1545 1546 /* openvswitch users expect packet sizes to be unrestricted, 1547 * so set the largest MTU we can. 1548 */ 1549 err = __geneve_change_mtu(dev, IP_MAX_MTU, false); 1550 if (err) 1551 goto err; 1552 1553 return dev; 1554 1555 err: 1556 free_netdev(dev); 1557 return ERR_PTR(err); 1558 } 1559 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1560 1561 static __net_init int geneve_init_net(struct net *net) 1562 { 1563 struct geneve_net *gn = net_generic(net, geneve_net_id); 1564 1565 INIT_LIST_HEAD(&gn->geneve_list); 1566 INIT_LIST_HEAD(&gn->sock_list); 1567 return 0; 1568 } 1569 1570 static void __net_exit geneve_exit_net(struct net *net) 1571 { 1572 struct geneve_net *gn = net_generic(net, geneve_net_id); 1573 struct geneve_dev *geneve, *next; 1574 struct net_device *dev, *aux; 1575 LIST_HEAD(list); 1576 1577 rtnl_lock(); 1578 1579 /* gather any geneve devices that were moved into this ns */ 1580 for_each_netdev_safe(net, dev, aux) 1581 if (dev->rtnl_link_ops == &geneve_link_ops) 1582 unregister_netdevice_queue(dev, &list); 1583 1584 /* now gather any other geneve devices that were created in this ns */ 1585 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1586 /* If geneve->dev is in the same netns, it was already added 1587 * to the list by the previous loop. 1588 */ 1589 if (!net_eq(dev_net(geneve->dev), net)) 1590 unregister_netdevice_queue(geneve->dev, &list); 1591 } 1592 1593 /* unregister the devices gathered above */ 1594 unregister_netdevice_many(&list); 1595 rtnl_unlock(); 1596 } 1597 1598 static struct pernet_operations geneve_net_ops = { 1599 .init = geneve_init_net, 1600 .exit = geneve_exit_net, 1601 .id = &geneve_net_id, 1602 .size = sizeof(struct geneve_net), 1603 }; 1604 1605 static int __init geneve_init_module(void) 1606 { 1607 int rc; 1608 1609 rc = register_pernet_subsys(&geneve_net_ops); 1610 if (rc) 1611 goto out1; 1612 1613 rc = rtnl_link_register(&geneve_link_ops); 1614 if (rc) 1615 goto out2; 1616 1617 return 0; 1618 out2: 1619 unregister_pernet_subsys(&geneve_net_ops); 1620 out1: 1621 return rc; 1622 } 1623 late_initcall(geneve_init_module); 1624 1625 static void __exit geneve_cleanup_module(void) 1626 { 1627 rtnl_link_unregister(&geneve_link_ops); 1628 unregister_pernet_subsys(&geneve_net_ops); 1629 } 1630 module_exit(geneve_cleanup_module); 1631 1632 MODULE_LICENSE("GPL"); 1633 MODULE_VERSION(GENEVE_NETDEV_VER); 1634 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1635 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1636 MODULE_ALIAS_RTNL_LINK("geneve"); 1637