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 gh = (struct genevehdr *)(skb->data + nhoff); 508 gh_len = geneve_hlen(gh); 509 type = gh->proto_type; 510 511 rcu_read_lock(); 512 ptype = gro_find_complete_by_type(type); 513 if (ptype) 514 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 515 516 rcu_read_unlock(); 517 518 skb_set_inner_mac_header(skb, nhoff + gh_len); 519 520 return err; 521 } 522 523 /* Create new listen socket if needed */ 524 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 525 bool ipv6, u32 flags) 526 { 527 struct geneve_net *gn = net_generic(net, geneve_net_id); 528 struct geneve_sock *gs; 529 struct socket *sock; 530 struct udp_tunnel_sock_cfg tunnel_cfg; 531 int h; 532 533 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 534 if (!gs) 535 return ERR_PTR(-ENOMEM); 536 537 sock = geneve_create_sock(net, ipv6, port, flags); 538 if (IS_ERR(sock)) { 539 kfree(gs); 540 return ERR_CAST(sock); 541 } 542 543 gs->sock = sock; 544 gs->refcnt = 1; 545 for (h = 0; h < VNI_HASH_SIZE; ++h) 546 INIT_HLIST_HEAD(&gs->vni_list[h]); 547 548 /* Initialize the geneve udp offloads structure */ 549 gs->udp_offloads.port = port; 550 gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive; 551 gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete; 552 geneve_notify_add_rx_port(gs); 553 554 /* Mark socket as an encapsulation socket */ 555 tunnel_cfg.sk_user_data = gs; 556 tunnel_cfg.encap_type = 1; 557 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 558 tunnel_cfg.encap_destroy = NULL; 559 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 560 list_add(&gs->list, &gn->sock_list); 561 return gs; 562 } 563 564 static void geneve_notify_del_rx_port(struct geneve_sock *gs) 565 { 566 struct net_device *dev; 567 struct sock *sk = gs->sock->sk; 568 struct net *net = sock_net(sk); 569 sa_family_t sa_family = geneve_get_sk_family(gs); 570 __be16 port = inet_sk(sk)->inet_sport; 571 572 rcu_read_lock(); 573 for_each_netdev_rcu(net, dev) { 574 if (dev->netdev_ops->ndo_del_geneve_port) 575 dev->netdev_ops->ndo_del_geneve_port(dev, sa_family, 576 port); 577 } 578 579 rcu_read_unlock(); 580 581 if (sa_family == AF_INET) 582 udp_del_offload(&gs->udp_offloads); 583 } 584 585 static void __geneve_sock_release(struct geneve_sock *gs) 586 { 587 if (!gs || --gs->refcnt) 588 return; 589 590 list_del(&gs->list); 591 geneve_notify_del_rx_port(gs); 592 udp_tunnel_sock_release(gs->sock); 593 kfree_rcu(gs, rcu); 594 } 595 596 static void geneve_sock_release(struct geneve_dev *geneve) 597 { 598 __geneve_sock_release(geneve->sock4); 599 #if IS_ENABLED(CONFIG_IPV6) 600 __geneve_sock_release(geneve->sock6); 601 #endif 602 } 603 604 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 605 sa_family_t family, 606 __be16 dst_port) 607 { 608 struct geneve_sock *gs; 609 610 list_for_each_entry(gs, &gn->sock_list, list) { 611 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 612 geneve_get_sk_family(gs) == family) { 613 return gs; 614 } 615 } 616 return NULL; 617 } 618 619 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 620 { 621 struct net *net = geneve->net; 622 struct geneve_net *gn = net_generic(net, geneve_net_id); 623 struct geneve_sock *gs; 624 __u32 hash; 625 626 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port); 627 if (gs) { 628 gs->refcnt++; 629 goto out; 630 } 631 632 gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags); 633 if (IS_ERR(gs)) 634 return PTR_ERR(gs); 635 636 out: 637 gs->collect_md = geneve->collect_md; 638 gs->flags = geneve->flags; 639 #if IS_ENABLED(CONFIG_IPV6) 640 if (ipv6) 641 geneve->sock6 = gs; 642 else 643 #endif 644 geneve->sock4 = gs; 645 646 hash = geneve_net_vni_hash(geneve->vni); 647 hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]); 648 return 0; 649 } 650 651 static int geneve_open(struct net_device *dev) 652 { 653 struct geneve_dev *geneve = netdev_priv(dev); 654 bool ipv6 = geneve->remote.sa.sa_family == AF_INET6; 655 bool metadata = geneve->collect_md; 656 int ret = 0; 657 658 geneve->sock4 = NULL; 659 #if IS_ENABLED(CONFIG_IPV6) 660 geneve->sock6 = NULL; 661 if (ipv6 || metadata) 662 ret = geneve_sock_add(geneve, true); 663 #endif 664 if (!ret && (!ipv6 || metadata)) 665 ret = geneve_sock_add(geneve, false); 666 if (ret < 0) 667 geneve_sock_release(geneve); 668 669 return ret; 670 } 671 672 static int geneve_stop(struct net_device *dev) 673 { 674 struct geneve_dev *geneve = netdev_priv(dev); 675 676 if (!hlist_unhashed(&geneve->hlist)) 677 hlist_del_rcu(&geneve->hlist); 678 geneve_sock_release(geneve); 679 return 0; 680 } 681 682 static void geneve_build_header(struct genevehdr *geneveh, 683 __be16 tun_flags, u8 vni[3], 684 u8 options_len, u8 *options) 685 { 686 geneveh->ver = GENEVE_VER; 687 geneveh->opt_len = options_len / 4; 688 geneveh->oam = !!(tun_flags & TUNNEL_OAM); 689 geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT); 690 geneveh->rsvd1 = 0; 691 memcpy(geneveh->vni, vni, 3); 692 geneveh->proto_type = htons(ETH_P_TEB); 693 geneveh->rsvd2 = 0; 694 695 memcpy(geneveh->options, options, options_len); 696 } 697 698 static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb, 699 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, 700 u32 flags, bool xnet) 701 { 702 struct genevehdr *gnvh; 703 int min_headroom; 704 int err; 705 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX); 706 707 skb_scrub_packet(skb, xnet); 708 709 min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len 710 + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr); 711 err = skb_cow_head(skb, min_headroom); 712 if (unlikely(err)) { 713 kfree_skb(skb); 714 goto free_rt; 715 } 716 717 skb = udp_tunnel_handle_offloads(skb, udp_sum); 718 if (IS_ERR(skb)) { 719 err = PTR_ERR(skb); 720 goto free_rt; 721 } 722 723 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); 724 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); 725 726 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 727 return 0; 728 729 free_rt: 730 ip_rt_put(rt); 731 return err; 732 } 733 734 #if IS_ENABLED(CONFIG_IPV6) 735 static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb, 736 __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt, 737 u32 flags, bool xnet) 738 { 739 struct genevehdr *gnvh; 740 int min_headroom; 741 int err; 742 bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX); 743 744 skb_scrub_packet(skb, xnet); 745 746 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len 747 + GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr); 748 err = skb_cow_head(skb, min_headroom); 749 if (unlikely(err)) { 750 kfree_skb(skb); 751 goto free_dst; 752 } 753 754 skb = udp_tunnel_handle_offloads(skb, udp_sum); 755 if (IS_ERR(skb)) { 756 err = PTR_ERR(skb); 757 goto free_dst; 758 } 759 760 gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len); 761 geneve_build_header(gnvh, tun_flags, vni, opt_len, opt); 762 763 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 764 return 0; 765 766 free_dst: 767 dst_release(dst); 768 return err; 769 } 770 #endif 771 772 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 773 struct net_device *dev, 774 struct flowi4 *fl4, 775 struct ip_tunnel_info *info) 776 { 777 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 778 struct geneve_dev *geneve = netdev_priv(dev); 779 struct dst_cache *dst_cache; 780 struct rtable *rt = NULL; 781 __u8 tos; 782 783 memset(fl4, 0, sizeof(*fl4)); 784 fl4->flowi4_mark = skb->mark; 785 fl4->flowi4_proto = IPPROTO_UDP; 786 787 if (info) { 788 fl4->daddr = info->key.u.ipv4.dst; 789 fl4->saddr = info->key.u.ipv4.src; 790 fl4->flowi4_tos = RT_TOS(info->key.tos); 791 dst_cache = &info->dst_cache; 792 } else { 793 tos = geneve->tos; 794 if (tos == 1) { 795 const struct iphdr *iip = ip_hdr(skb); 796 797 tos = ip_tunnel_get_dsfield(iip, skb); 798 use_cache = false; 799 } 800 801 fl4->flowi4_tos = RT_TOS(tos); 802 fl4->daddr = geneve->remote.sin.sin_addr.s_addr; 803 dst_cache = &geneve->dst_cache; 804 } 805 806 if (use_cache) { 807 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 808 if (rt) 809 return rt; 810 } 811 812 rt = ip_route_output_key(geneve->net, fl4); 813 if (IS_ERR(rt)) { 814 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 815 return ERR_PTR(-ENETUNREACH); 816 } 817 if (rt->dst.dev == dev) { /* is this necessary? */ 818 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 819 ip_rt_put(rt); 820 return ERR_PTR(-ELOOP); 821 } 822 if (use_cache) 823 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 824 return rt; 825 } 826 827 #if IS_ENABLED(CONFIG_IPV6) 828 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 829 struct net_device *dev, 830 struct flowi6 *fl6, 831 struct ip_tunnel_info *info) 832 { 833 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 834 struct geneve_dev *geneve = netdev_priv(dev); 835 struct geneve_sock *gs6 = geneve->sock6; 836 struct dst_entry *dst = NULL; 837 struct dst_cache *dst_cache; 838 __u8 prio; 839 840 memset(fl6, 0, sizeof(*fl6)); 841 fl6->flowi6_mark = skb->mark; 842 fl6->flowi6_proto = IPPROTO_UDP; 843 844 if (info) { 845 fl6->daddr = info->key.u.ipv6.dst; 846 fl6->saddr = info->key.u.ipv6.src; 847 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos), 848 info->key.label); 849 dst_cache = &info->dst_cache; 850 } else { 851 prio = geneve->tos; 852 if (prio == 1) { 853 const struct iphdr *iip = ip_hdr(skb); 854 855 prio = ip_tunnel_get_dsfield(iip, skb); 856 use_cache = false; 857 } 858 859 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 860 geneve->label); 861 fl6->daddr = geneve->remote.sin6.sin6_addr; 862 dst_cache = &geneve->dst_cache; 863 } 864 865 if (use_cache) { 866 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 867 if (dst) 868 return dst; 869 } 870 871 if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) { 872 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 873 return ERR_PTR(-ENETUNREACH); 874 } 875 if (dst->dev == dev) { /* is this necessary? */ 876 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 877 dst_release(dst); 878 return ERR_PTR(-ELOOP); 879 } 880 881 if (use_cache) 882 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 883 return dst; 884 } 885 #endif 886 887 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 888 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 889 { 890 #ifdef __BIG_ENDIAN 891 vni[0] = (__force __u8)(tun_id >> 16); 892 vni[1] = (__force __u8)(tun_id >> 8); 893 vni[2] = (__force __u8)tun_id; 894 #else 895 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 896 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 897 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 898 #endif 899 } 900 901 static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 902 struct ip_tunnel_info *info) 903 { 904 struct geneve_dev *geneve = netdev_priv(dev); 905 struct geneve_sock *gs4 = geneve->sock4; 906 struct rtable *rt = NULL; 907 const struct iphdr *iip; /* interior IP header */ 908 int err = -EINVAL; 909 struct flowi4 fl4; 910 __u8 tos, ttl; 911 __be16 sport; 912 __be16 df; 913 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 914 u32 flags = geneve->flags; 915 916 if (geneve->collect_md) { 917 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 918 netdev_dbg(dev, "no tunnel metadata\n"); 919 goto tx_error; 920 } 921 if (info && ip_tunnel_info_af(info) != AF_INET) 922 goto tx_error; 923 } 924 925 rt = geneve_get_v4_rt(skb, dev, &fl4, info); 926 if (IS_ERR(rt)) { 927 err = PTR_ERR(rt); 928 goto tx_error; 929 } 930 931 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 932 skb_reset_mac_header(skb); 933 934 iip = ip_hdr(skb); 935 936 if (info) { 937 const struct ip_tunnel_key *key = &info->key; 938 u8 *opts = NULL; 939 u8 vni[3]; 940 941 tunnel_id_to_vni(key->tun_id, vni); 942 if (info->options_len) 943 opts = ip_tunnel_info_opts(info); 944 945 if (key->tun_flags & TUNNEL_CSUM) 946 flags &= ~GENEVE_F_UDP_ZERO_CSUM_TX; 947 else 948 flags |= GENEVE_F_UDP_ZERO_CSUM_TX; 949 950 err = geneve_build_skb(rt, skb, key->tun_flags, vni, 951 info->options_len, opts, flags, xnet); 952 if (unlikely(err)) 953 goto err; 954 955 tos = ip_tunnel_ecn_encap(key->tos, iip, skb); 956 ttl = key->ttl; 957 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 958 } else { 959 err = geneve_build_skb(rt, skb, 0, geneve->vni, 960 0, NULL, flags, xnet); 961 if (unlikely(err)) 962 goto err; 963 964 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb); 965 ttl = geneve->ttl; 966 if (!ttl && IN_MULTICAST(ntohl(fl4.daddr))) 967 ttl = 1; 968 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 969 df = 0; 970 } 971 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 972 tos, ttl, df, sport, geneve->dst_port, 973 !net_eq(geneve->net, dev_net(geneve->dev)), 974 !!(flags & GENEVE_F_UDP_ZERO_CSUM_TX)); 975 976 return NETDEV_TX_OK; 977 978 tx_error: 979 dev_kfree_skb(skb); 980 err: 981 if (err == -ELOOP) 982 dev->stats.collisions++; 983 else if (err == -ENETUNREACH) 984 dev->stats.tx_carrier_errors++; 985 else 986 dev->stats.tx_errors++; 987 return NETDEV_TX_OK; 988 } 989 990 #if IS_ENABLED(CONFIG_IPV6) 991 static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 992 struct ip_tunnel_info *info) 993 { 994 struct geneve_dev *geneve = netdev_priv(dev); 995 struct geneve_sock *gs6 = geneve->sock6; 996 struct dst_entry *dst = NULL; 997 const struct iphdr *iip; /* interior IP header */ 998 int err = -EINVAL; 999 struct flowi6 fl6; 1000 __u8 prio, ttl; 1001 __be16 sport; 1002 __be32 label; 1003 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 1004 u32 flags = geneve->flags; 1005 1006 if (geneve->collect_md) { 1007 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1008 netdev_dbg(dev, "no tunnel metadata\n"); 1009 goto tx_error; 1010 } 1011 } 1012 1013 dst = geneve_get_v6_dst(skb, dev, &fl6, info); 1014 if (IS_ERR(dst)) { 1015 err = PTR_ERR(dst); 1016 goto tx_error; 1017 } 1018 1019 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 1020 skb_reset_mac_header(skb); 1021 1022 iip = ip_hdr(skb); 1023 1024 if (info) { 1025 const struct ip_tunnel_key *key = &info->key; 1026 u8 *opts = NULL; 1027 u8 vni[3]; 1028 1029 tunnel_id_to_vni(key->tun_id, vni); 1030 if (info->options_len) 1031 opts = ip_tunnel_info_opts(info); 1032 1033 if (key->tun_flags & TUNNEL_CSUM) 1034 flags &= ~GENEVE_F_UDP_ZERO_CSUM6_TX; 1035 else 1036 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; 1037 1038 err = geneve6_build_skb(dst, skb, key->tun_flags, vni, 1039 info->options_len, opts, 1040 flags, xnet); 1041 if (unlikely(err)) 1042 goto err; 1043 1044 prio = ip_tunnel_ecn_encap(key->tos, iip, skb); 1045 ttl = key->ttl; 1046 label = info->key.label; 1047 } else { 1048 err = geneve6_build_skb(dst, skb, 0, geneve->vni, 1049 0, NULL, flags, xnet); 1050 if (unlikely(err)) 1051 goto err; 1052 1053 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1054 iip, skb); 1055 ttl = geneve->ttl; 1056 if (!ttl && ipv6_addr_is_multicast(&fl6.daddr)) 1057 ttl = 1; 1058 ttl = ttl ? : ip6_dst_hoplimit(dst); 1059 label = geneve->label; 1060 } 1061 1062 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1063 &fl6.saddr, &fl6.daddr, prio, ttl, label, 1064 sport, geneve->dst_port, 1065 !!(flags & GENEVE_F_UDP_ZERO_CSUM6_TX)); 1066 return NETDEV_TX_OK; 1067 1068 tx_error: 1069 dev_kfree_skb(skb); 1070 err: 1071 if (err == -ELOOP) 1072 dev->stats.collisions++; 1073 else if (err == -ENETUNREACH) 1074 dev->stats.tx_carrier_errors++; 1075 else 1076 dev->stats.tx_errors++; 1077 return NETDEV_TX_OK; 1078 } 1079 #endif 1080 1081 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1082 { 1083 struct geneve_dev *geneve = netdev_priv(dev); 1084 struct ip_tunnel_info *info = NULL; 1085 1086 if (geneve->collect_md) 1087 info = skb_tunnel_info(skb); 1088 1089 #if IS_ENABLED(CONFIG_IPV6) 1090 if ((info && ip_tunnel_info_af(info) == AF_INET6) || 1091 (!info && geneve->remote.sa.sa_family == AF_INET6)) 1092 return geneve6_xmit_skb(skb, dev, info); 1093 #endif 1094 return geneve_xmit_skb(skb, dev, info); 1095 } 1096 1097 static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict) 1098 { 1099 /* The max_mtu calculation does not take account of GENEVE 1100 * options, to avoid excluding potentially valid 1101 * configurations. 1102 */ 1103 int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - sizeof(struct iphdr) 1104 - dev->hard_header_len; 1105 1106 if (new_mtu < 68) 1107 return -EINVAL; 1108 1109 if (new_mtu > max_mtu) { 1110 if (strict) 1111 return -EINVAL; 1112 1113 new_mtu = max_mtu; 1114 } 1115 1116 dev->mtu = new_mtu; 1117 return 0; 1118 } 1119 1120 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1121 { 1122 return __geneve_change_mtu(dev, new_mtu, true); 1123 } 1124 1125 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1126 { 1127 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1128 struct geneve_dev *geneve = netdev_priv(dev); 1129 struct rtable *rt; 1130 struct flowi4 fl4; 1131 #if IS_ENABLED(CONFIG_IPV6) 1132 struct dst_entry *dst; 1133 struct flowi6 fl6; 1134 #endif 1135 1136 if (ip_tunnel_info_af(info) == AF_INET) { 1137 rt = geneve_get_v4_rt(skb, dev, &fl4, info); 1138 if (IS_ERR(rt)) 1139 return PTR_ERR(rt); 1140 1141 ip_rt_put(rt); 1142 info->key.u.ipv4.src = fl4.saddr; 1143 #if IS_ENABLED(CONFIG_IPV6) 1144 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1145 dst = geneve_get_v6_dst(skb, dev, &fl6, info); 1146 if (IS_ERR(dst)) 1147 return PTR_ERR(dst); 1148 1149 dst_release(dst); 1150 info->key.u.ipv6.src = fl6.saddr; 1151 #endif 1152 } else { 1153 return -EINVAL; 1154 } 1155 1156 info->key.tp_src = udp_flow_src_port(geneve->net, skb, 1157 1, USHRT_MAX, true); 1158 info->key.tp_dst = geneve->dst_port; 1159 return 0; 1160 } 1161 1162 static const struct net_device_ops geneve_netdev_ops = { 1163 .ndo_init = geneve_init, 1164 .ndo_uninit = geneve_uninit, 1165 .ndo_open = geneve_open, 1166 .ndo_stop = geneve_stop, 1167 .ndo_start_xmit = geneve_xmit, 1168 .ndo_get_stats64 = ip_tunnel_get_stats64, 1169 .ndo_change_mtu = geneve_change_mtu, 1170 .ndo_validate_addr = eth_validate_addr, 1171 .ndo_set_mac_address = eth_mac_addr, 1172 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1173 }; 1174 1175 static void geneve_get_drvinfo(struct net_device *dev, 1176 struct ethtool_drvinfo *drvinfo) 1177 { 1178 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1179 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1180 } 1181 1182 static const struct ethtool_ops geneve_ethtool_ops = { 1183 .get_drvinfo = geneve_get_drvinfo, 1184 .get_link = ethtool_op_get_link, 1185 }; 1186 1187 /* Info for udev, that this is a virtual tunnel endpoint */ 1188 static struct device_type geneve_type = { 1189 .name = "geneve", 1190 }; 1191 1192 /* Calls the ndo_add_geneve_port of the caller in order to 1193 * supply the listening GENEVE udp ports. Callers are expected 1194 * to implement the ndo_add_geneve_port. 1195 */ 1196 void geneve_get_rx_port(struct net_device *dev) 1197 { 1198 struct net *net = dev_net(dev); 1199 struct geneve_net *gn = net_generic(net, geneve_net_id); 1200 struct geneve_sock *gs; 1201 sa_family_t sa_family; 1202 struct sock *sk; 1203 __be16 port; 1204 1205 rcu_read_lock(); 1206 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1207 sk = gs->sock->sk; 1208 sa_family = sk->sk_family; 1209 port = inet_sk(sk)->inet_sport; 1210 dev->netdev_ops->ndo_add_geneve_port(dev, sa_family, port); 1211 } 1212 rcu_read_unlock(); 1213 } 1214 EXPORT_SYMBOL_GPL(geneve_get_rx_port); 1215 1216 /* Initialize the device structure. */ 1217 static void geneve_setup(struct net_device *dev) 1218 { 1219 ether_setup(dev); 1220 1221 dev->netdev_ops = &geneve_netdev_ops; 1222 dev->ethtool_ops = &geneve_ethtool_ops; 1223 dev->destructor = free_netdev; 1224 1225 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1226 1227 dev->features |= NETIF_F_LLTX; 1228 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; 1229 dev->features |= NETIF_F_RXCSUM; 1230 dev->features |= NETIF_F_GSO_SOFTWARE; 1231 1232 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; 1233 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1234 1235 netif_keep_dst(dev); 1236 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1237 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1238 eth_hw_addr_random(dev); 1239 } 1240 1241 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1242 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1243 [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, 1244 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1245 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1246 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1247 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1248 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1249 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1250 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1251 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1252 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1253 }; 1254 1255 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[]) 1256 { 1257 if (tb[IFLA_ADDRESS]) { 1258 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 1259 return -EINVAL; 1260 1261 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 1262 return -EADDRNOTAVAIL; 1263 } 1264 1265 if (!data) 1266 return -EINVAL; 1267 1268 if (data[IFLA_GENEVE_ID]) { 1269 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1270 1271 if (vni >= GENEVE_VID_MASK) 1272 return -ERANGE; 1273 } 1274 1275 return 0; 1276 } 1277 1278 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1279 __be16 dst_port, 1280 union geneve_addr *remote, 1281 u8 vni[], 1282 bool *tun_on_same_port, 1283 bool *tun_collect_md) 1284 { 1285 struct geneve_dev *geneve, *t; 1286 1287 *tun_on_same_port = false; 1288 *tun_collect_md = false; 1289 t = NULL; 1290 list_for_each_entry(geneve, &gn->geneve_list, next) { 1291 if (geneve->dst_port == dst_port) { 1292 *tun_collect_md = geneve->collect_md; 1293 *tun_on_same_port = true; 1294 } 1295 if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) && 1296 !memcmp(remote, &geneve->remote, sizeof(geneve->remote)) && 1297 dst_port == geneve->dst_port) 1298 t = geneve; 1299 } 1300 return t; 1301 } 1302 1303 static int geneve_configure(struct net *net, struct net_device *dev, 1304 union geneve_addr *remote, 1305 __u32 vni, __u8 ttl, __u8 tos, __be32 label, 1306 __be16 dst_port, bool metadata, u32 flags) 1307 { 1308 struct geneve_net *gn = net_generic(net, geneve_net_id); 1309 struct geneve_dev *t, *geneve = netdev_priv(dev); 1310 bool tun_collect_md, tun_on_same_port; 1311 int err, encap_len; 1312 1313 if (!remote) 1314 return -EINVAL; 1315 if (metadata && 1316 (remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl || label)) 1317 return -EINVAL; 1318 1319 geneve->net = net; 1320 geneve->dev = dev; 1321 1322 geneve->vni[0] = (vni & 0x00ff0000) >> 16; 1323 geneve->vni[1] = (vni & 0x0000ff00) >> 8; 1324 geneve->vni[2] = vni & 0x000000ff; 1325 1326 if ((remote->sa.sa_family == AF_INET && 1327 IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) || 1328 (remote->sa.sa_family == AF_INET6 && 1329 ipv6_addr_is_multicast(&remote->sin6.sin6_addr))) 1330 return -EINVAL; 1331 if (label && remote->sa.sa_family != AF_INET6) 1332 return -EINVAL; 1333 1334 geneve->remote = *remote; 1335 1336 geneve->ttl = ttl; 1337 geneve->tos = tos; 1338 geneve->label = label; 1339 geneve->dst_port = dst_port; 1340 geneve->collect_md = metadata; 1341 geneve->flags = flags; 1342 1343 t = geneve_find_dev(gn, dst_port, remote, geneve->vni, 1344 &tun_on_same_port, &tun_collect_md); 1345 if (t) 1346 return -EBUSY; 1347 1348 /* make enough headroom for basic scenario */ 1349 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1350 if (remote->sa.sa_family == AF_INET) 1351 encap_len += sizeof(struct iphdr); 1352 else 1353 encap_len += sizeof(struct ipv6hdr); 1354 dev->needed_headroom = encap_len + ETH_HLEN; 1355 1356 if (metadata) { 1357 if (tun_on_same_port) 1358 return -EPERM; 1359 } else { 1360 if (tun_collect_md) 1361 return -EPERM; 1362 } 1363 1364 dst_cache_reset(&geneve->dst_cache); 1365 1366 err = register_netdevice(dev); 1367 if (err) 1368 return err; 1369 1370 list_add(&geneve->next, &gn->geneve_list); 1371 return 0; 1372 } 1373 1374 static int geneve_newlink(struct net *net, struct net_device *dev, 1375 struct nlattr *tb[], struct nlattr *data[]) 1376 { 1377 __be16 dst_port = htons(GENEVE_UDP_PORT); 1378 __u8 ttl = 0, tos = 0; 1379 bool metadata = false; 1380 union geneve_addr remote = geneve_remote_unspec; 1381 __be32 label = 0; 1382 __u32 vni = 0; 1383 u32 flags = 0; 1384 1385 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) 1386 return -EINVAL; 1387 1388 if (data[IFLA_GENEVE_REMOTE]) { 1389 remote.sa.sa_family = AF_INET; 1390 remote.sin.sin_addr.s_addr = 1391 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1392 } 1393 1394 if (data[IFLA_GENEVE_REMOTE6]) { 1395 if (!IS_ENABLED(CONFIG_IPV6)) 1396 return -EPFNOSUPPORT; 1397 1398 remote.sa.sa_family = AF_INET6; 1399 remote.sin6.sin6_addr = 1400 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1401 1402 if (ipv6_addr_type(&remote.sin6.sin6_addr) & 1403 IPV6_ADDR_LINKLOCAL) { 1404 netdev_dbg(dev, "link-local remote is unsupported\n"); 1405 return -EINVAL; 1406 } 1407 } 1408 1409 if (data[IFLA_GENEVE_ID]) 1410 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1411 1412 if (data[IFLA_GENEVE_TTL]) 1413 ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1414 1415 if (data[IFLA_GENEVE_TOS]) 1416 tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1417 1418 if (data[IFLA_GENEVE_LABEL]) 1419 label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1420 IPV6_FLOWLABEL_MASK; 1421 1422 if (data[IFLA_GENEVE_PORT]) 1423 dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]); 1424 1425 if (data[IFLA_GENEVE_COLLECT_METADATA]) 1426 metadata = true; 1427 1428 if (data[IFLA_GENEVE_UDP_CSUM] && 1429 !nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1430 flags |= GENEVE_F_UDP_ZERO_CSUM_TX; 1431 1432 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] && 1433 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1434 flags |= GENEVE_F_UDP_ZERO_CSUM6_TX; 1435 1436 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] && 1437 nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1438 flags |= GENEVE_F_UDP_ZERO_CSUM6_RX; 1439 1440 return geneve_configure(net, dev, &remote, vni, ttl, tos, label, 1441 dst_port, metadata, flags); 1442 } 1443 1444 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1445 { 1446 struct geneve_dev *geneve = netdev_priv(dev); 1447 1448 list_del(&geneve->next); 1449 unregister_netdevice_queue(dev, head); 1450 } 1451 1452 static size_t geneve_get_size(const struct net_device *dev) 1453 { 1454 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1455 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1456 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1457 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1458 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1459 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1460 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1461 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1462 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1463 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1464 0; 1465 } 1466 1467 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1468 { 1469 struct geneve_dev *geneve = netdev_priv(dev); 1470 __u32 vni; 1471 1472 vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2]; 1473 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1474 goto nla_put_failure; 1475 1476 if (geneve->remote.sa.sa_family == AF_INET) { 1477 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1478 geneve->remote.sin.sin_addr.s_addr)) 1479 goto nla_put_failure; 1480 #if IS_ENABLED(CONFIG_IPV6) 1481 } else { 1482 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1483 &geneve->remote.sin6.sin6_addr)) 1484 goto nla_put_failure; 1485 #endif 1486 } 1487 1488 if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) || 1489 nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos) || 1490 nla_put_be32(skb, IFLA_GENEVE_LABEL, geneve->label)) 1491 goto nla_put_failure; 1492 1493 if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port)) 1494 goto nla_put_failure; 1495 1496 if (geneve->collect_md) { 1497 if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1498 goto nla_put_failure; 1499 } 1500 1501 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1502 !(geneve->flags & GENEVE_F_UDP_ZERO_CSUM_TX)) || 1503 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1504 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_TX)) || 1505 nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1506 !!(geneve->flags & GENEVE_F_UDP_ZERO_CSUM6_RX))) 1507 goto nla_put_failure; 1508 1509 return 0; 1510 1511 nla_put_failure: 1512 return -EMSGSIZE; 1513 } 1514 1515 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1516 .kind = "geneve", 1517 .maxtype = IFLA_GENEVE_MAX, 1518 .policy = geneve_policy, 1519 .priv_size = sizeof(struct geneve_dev), 1520 .setup = geneve_setup, 1521 .validate = geneve_validate, 1522 .newlink = geneve_newlink, 1523 .dellink = geneve_dellink, 1524 .get_size = geneve_get_size, 1525 .fill_info = geneve_fill_info, 1526 }; 1527 1528 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1529 u8 name_assign_type, u16 dst_port) 1530 { 1531 struct nlattr *tb[IFLA_MAX + 1]; 1532 struct net_device *dev; 1533 int err; 1534 1535 memset(tb, 0, sizeof(tb)); 1536 dev = rtnl_create_link(net, name, name_assign_type, 1537 &geneve_link_ops, tb); 1538 if (IS_ERR(dev)) 1539 return dev; 1540 1541 err = geneve_configure(net, dev, &geneve_remote_unspec, 1542 0, 0, 0, 0, htons(dst_port), true, 1543 GENEVE_F_UDP_ZERO_CSUM6_RX); 1544 if (err) 1545 goto err; 1546 1547 /* openvswitch users expect packet sizes to be unrestricted, 1548 * so set the largest MTU we can. 1549 */ 1550 err = __geneve_change_mtu(dev, IP_MAX_MTU, false); 1551 if (err) 1552 goto err; 1553 1554 return dev; 1555 1556 err: 1557 free_netdev(dev); 1558 return ERR_PTR(err); 1559 } 1560 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1561 1562 static __net_init int geneve_init_net(struct net *net) 1563 { 1564 struct geneve_net *gn = net_generic(net, geneve_net_id); 1565 1566 INIT_LIST_HEAD(&gn->geneve_list); 1567 INIT_LIST_HEAD(&gn->sock_list); 1568 return 0; 1569 } 1570 1571 static void __net_exit geneve_exit_net(struct net *net) 1572 { 1573 struct geneve_net *gn = net_generic(net, geneve_net_id); 1574 struct geneve_dev *geneve, *next; 1575 struct net_device *dev, *aux; 1576 LIST_HEAD(list); 1577 1578 rtnl_lock(); 1579 1580 /* gather any geneve devices that were moved into this ns */ 1581 for_each_netdev_safe(net, dev, aux) 1582 if (dev->rtnl_link_ops == &geneve_link_ops) 1583 unregister_netdevice_queue(dev, &list); 1584 1585 /* now gather any other geneve devices that were created in this ns */ 1586 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1587 /* If geneve->dev is in the same netns, it was already added 1588 * to the list by the previous loop. 1589 */ 1590 if (!net_eq(dev_net(geneve->dev), net)) 1591 unregister_netdevice_queue(geneve->dev, &list); 1592 } 1593 1594 /* unregister the devices gathered above */ 1595 unregister_netdevice_many(&list); 1596 rtnl_unlock(); 1597 } 1598 1599 static struct pernet_operations geneve_net_ops = { 1600 .init = geneve_init_net, 1601 .exit = geneve_exit_net, 1602 .id = &geneve_net_id, 1603 .size = sizeof(struct geneve_net), 1604 }; 1605 1606 static int __init geneve_init_module(void) 1607 { 1608 int rc; 1609 1610 rc = register_pernet_subsys(&geneve_net_ops); 1611 if (rc) 1612 goto out1; 1613 1614 rc = rtnl_link_register(&geneve_link_ops); 1615 if (rc) 1616 goto out2; 1617 1618 return 0; 1619 out2: 1620 unregister_pernet_subsys(&geneve_net_ops); 1621 out1: 1622 return rc; 1623 } 1624 late_initcall(geneve_init_module); 1625 1626 static void __exit geneve_cleanup_module(void) 1627 { 1628 rtnl_link_unregister(&geneve_link_ops); 1629 unregister_pernet_subsys(&geneve_net_ops); 1630 } 1631 module_exit(geneve_cleanup_module); 1632 1633 MODULE_LICENSE("GPL"); 1634 MODULE_VERSION(GENEVE_NETDEV_VER); 1635 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1636 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1637 MODULE_ALIAS_RTNL_LINK("geneve"); 1638