1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * GENEVE: Generic Network Virtualization Encapsulation 4 * 5 * Copyright (c) 2015 Red Hat, Inc. 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/ethtool.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/etherdevice.h> 14 #include <linux/hash.h> 15 #include <net/ipv6_stubs.h> 16 #include <net/dst_metadata.h> 17 #include <net/gro_cells.h> 18 #include <net/rtnetlink.h> 19 #include <net/geneve.h> 20 #include <net/gro.h> 21 #include <net/protocol.h> 22 23 #define GENEVE_NETDEV_VER "0.6" 24 25 #define GENEVE_N_VID (1u << 24) 26 #define GENEVE_VID_MASK (GENEVE_N_VID - 1) 27 28 #define VNI_HASH_BITS 10 29 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 30 31 static bool log_ecn_error = true; 32 module_param(log_ecn_error, bool, 0644); 33 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 34 35 #define GENEVE_VER 0 36 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) 37 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN) 38 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN) 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 unsigned int geneve_net_id; 47 48 struct geneve_dev_node { 49 struct hlist_node hlist; 50 struct geneve_dev *geneve; 51 }; 52 53 struct geneve_config { 54 struct ip_tunnel_info info; 55 bool collect_md; 56 bool use_udp6_rx_checksums; 57 bool ttl_inherit; 58 enum ifla_geneve_df df; 59 bool inner_proto_inherit; 60 }; 61 62 /* Pseudo network device */ 63 struct geneve_dev { 64 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ 65 #if IS_ENABLED(CONFIG_IPV6) 66 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ 67 #endif 68 struct net *net; /* netns for packet i/o */ 69 struct net_device *dev; /* netdev for geneve tunnel */ 70 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 71 #if IS_ENABLED(CONFIG_IPV6) 72 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ 73 #endif 74 struct list_head next; /* geneve's per namespace list */ 75 struct gro_cells gro_cells; 76 struct geneve_config cfg; 77 }; 78 79 struct geneve_sock { 80 bool collect_md; 81 struct list_head list; 82 struct socket *sock; 83 struct rcu_head rcu; 84 int refcnt; 85 struct hlist_head vni_list[VNI_HASH_SIZE]; 86 }; 87 88 static inline __u32 geneve_net_vni_hash(u8 vni[3]) 89 { 90 __u32 vnid; 91 92 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 93 return hash_32(vnid, VNI_HASH_BITS); 94 } 95 96 static __be64 vni_to_tunnel_id(const __u8 *vni) 97 { 98 #ifdef __BIG_ENDIAN 99 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 100 #else 101 return (__force __be64)(((__force u64)vni[0] << 40) | 102 ((__force u64)vni[1] << 48) | 103 ((__force u64)vni[2] << 56)); 104 #endif 105 } 106 107 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 108 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 109 { 110 #ifdef __BIG_ENDIAN 111 vni[0] = (__force __u8)(tun_id >> 16); 112 vni[1] = (__force __u8)(tun_id >> 8); 113 vni[2] = (__force __u8)tun_id; 114 #else 115 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 116 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 117 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 118 #endif 119 } 120 121 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) 122 { 123 return !memcmp(vni, &tun_id[5], 3); 124 } 125 126 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 127 { 128 return gs->sock->sk->sk_family; 129 } 130 131 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 132 __be32 addr, u8 vni[]) 133 { 134 struct hlist_head *vni_list_head; 135 struct geneve_dev_node *node; 136 __u32 hash; 137 138 /* Find the device for this VNI */ 139 hash = geneve_net_vni_hash(vni); 140 vni_list_head = &gs->vni_list[hash]; 141 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 142 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 143 addr == node->geneve->cfg.info.key.u.ipv4.dst) 144 return node->geneve; 145 } 146 return NULL; 147 } 148 149 #if IS_ENABLED(CONFIG_IPV6) 150 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 151 struct in6_addr addr6, u8 vni[]) 152 { 153 struct hlist_head *vni_list_head; 154 struct geneve_dev_node *node; 155 __u32 hash; 156 157 /* Find the device for this VNI */ 158 hash = geneve_net_vni_hash(vni); 159 vni_list_head = &gs->vni_list[hash]; 160 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 161 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 162 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst)) 163 return node->geneve; 164 } 165 return NULL; 166 } 167 #endif 168 169 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 170 { 171 return (struct genevehdr *)(udp_hdr(skb) + 1); 172 } 173 174 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 175 struct sk_buff *skb) 176 { 177 static u8 zero_vni[3]; 178 u8 *vni; 179 180 if (geneve_get_sk_family(gs) == AF_INET) { 181 struct iphdr *iph; 182 __be32 addr; 183 184 iph = ip_hdr(skb); /* outer IP header... */ 185 186 if (gs->collect_md) { 187 vni = zero_vni; 188 addr = 0; 189 } else { 190 vni = geneve_hdr(skb)->vni; 191 addr = iph->saddr; 192 } 193 194 return geneve_lookup(gs, addr, vni); 195 #if IS_ENABLED(CONFIG_IPV6) 196 } else if (geneve_get_sk_family(gs) == AF_INET6) { 197 static struct in6_addr zero_addr6; 198 struct ipv6hdr *ip6h; 199 struct in6_addr addr6; 200 201 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 202 203 if (gs->collect_md) { 204 vni = zero_vni; 205 addr6 = zero_addr6; 206 } else { 207 vni = geneve_hdr(skb)->vni; 208 addr6 = ip6h->saddr; 209 } 210 211 return geneve6_lookup(gs, addr6, vni); 212 #endif 213 } 214 return NULL; 215 } 216 217 /* geneve receive/decap routine */ 218 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 219 struct sk_buff *skb) 220 { 221 struct genevehdr *gnvh = geneve_hdr(skb); 222 struct metadata_dst *tun_dst = NULL; 223 unsigned int len; 224 int err = 0; 225 void *oiph; 226 227 if (ip_tunnel_collect_metadata() || gs->collect_md) { 228 __be16 flags; 229 230 flags = TUNNEL_KEY | (gnvh->oam ? TUNNEL_OAM : 0) | 231 (gnvh->critical ? TUNNEL_CRIT_OPT : 0); 232 233 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 234 vni_to_tunnel_id(gnvh->vni), 235 gnvh->opt_len * 4); 236 if (!tun_dst) { 237 geneve->dev->stats.rx_dropped++; 238 goto drop; 239 } 240 /* Update tunnel dst according to Geneve options. */ 241 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 242 gnvh->options, gnvh->opt_len * 4, 243 TUNNEL_GENEVE_OPT); 244 } else { 245 /* Drop packets w/ critical options, 246 * since we don't support any... 247 */ 248 if (gnvh->critical) { 249 geneve->dev->stats.rx_frame_errors++; 250 geneve->dev->stats.rx_errors++; 251 goto drop; 252 } 253 } 254 255 if (tun_dst) 256 skb_dst_set(skb, &tun_dst->dst); 257 258 if (gnvh->proto_type == htons(ETH_P_TEB)) { 259 skb_reset_mac_header(skb); 260 skb->protocol = eth_type_trans(skb, geneve->dev); 261 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 262 263 /* Ignore packet loops (and multicast echo) */ 264 if (ether_addr_equal(eth_hdr(skb)->h_source, 265 geneve->dev->dev_addr)) { 266 geneve->dev->stats.rx_errors++; 267 goto drop; 268 } 269 } else { 270 skb_reset_mac_header(skb); 271 skb->dev = geneve->dev; 272 skb->pkt_type = PACKET_HOST; 273 } 274 275 oiph = skb_network_header(skb); 276 skb_reset_network_header(skb); 277 278 if (geneve_get_sk_family(gs) == AF_INET) 279 err = IP_ECN_decapsulate(oiph, skb); 280 #if IS_ENABLED(CONFIG_IPV6) 281 else 282 err = IP6_ECN_decapsulate(oiph, skb); 283 #endif 284 285 if (unlikely(err)) { 286 if (log_ecn_error) { 287 if (geneve_get_sk_family(gs) == AF_INET) 288 net_info_ratelimited("non-ECT from %pI4 " 289 "with TOS=%#x\n", 290 &((struct iphdr *)oiph)->saddr, 291 ((struct iphdr *)oiph)->tos); 292 #if IS_ENABLED(CONFIG_IPV6) 293 else 294 net_info_ratelimited("non-ECT from %pI6\n", 295 &((struct ipv6hdr *)oiph)->saddr); 296 #endif 297 } 298 if (err > 1) { 299 ++geneve->dev->stats.rx_frame_errors; 300 ++geneve->dev->stats.rx_errors; 301 goto drop; 302 } 303 } 304 305 len = skb->len; 306 err = gro_cells_receive(&geneve->gro_cells, skb); 307 if (likely(err == NET_RX_SUCCESS)) 308 dev_sw_netstats_rx_add(geneve->dev, len); 309 310 return; 311 drop: 312 /* Consume bad packet */ 313 kfree_skb(skb); 314 } 315 316 /* Setup stats when device is created */ 317 static int geneve_init(struct net_device *dev) 318 { 319 struct geneve_dev *geneve = netdev_priv(dev); 320 int err; 321 322 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 323 if (!dev->tstats) 324 return -ENOMEM; 325 326 err = gro_cells_init(&geneve->gro_cells, dev); 327 if (err) { 328 free_percpu(dev->tstats); 329 return err; 330 } 331 332 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 333 if (err) { 334 free_percpu(dev->tstats); 335 gro_cells_destroy(&geneve->gro_cells); 336 return err; 337 } 338 return 0; 339 } 340 341 static void geneve_uninit(struct net_device *dev) 342 { 343 struct geneve_dev *geneve = netdev_priv(dev); 344 345 dst_cache_destroy(&geneve->cfg.info.dst_cache); 346 gro_cells_destroy(&geneve->gro_cells); 347 free_percpu(dev->tstats); 348 } 349 350 /* Callback from net/ipv4/udp.c to receive packets */ 351 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 352 { 353 struct genevehdr *geneveh; 354 struct geneve_dev *geneve; 355 struct geneve_sock *gs; 356 __be16 inner_proto; 357 int opts_len; 358 359 /* Need UDP and Geneve header to be present */ 360 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 361 goto drop; 362 363 /* Return packets with reserved bits set */ 364 geneveh = geneve_hdr(skb); 365 if (unlikely(geneveh->ver != GENEVE_VER)) 366 goto drop; 367 368 inner_proto = geneveh->proto_type; 369 370 if (unlikely((inner_proto != htons(ETH_P_TEB) && 371 inner_proto != htons(ETH_P_IP) && 372 inner_proto != htons(ETH_P_IPV6)))) 373 goto drop; 374 375 gs = rcu_dereference_sk_user_data(sk); 376 if (!gs) 377 goto drop; 378 379 geneve = geneve_lookup_skb(gs, skb); 380 if (!geneve) 381 goto drop; 382 383 if (unlikely((!geneve->cfg.inner_proto_inherit && 384 inner_proto != htons(ETH_P_TEB)))) { 385 geneve->dev->stats.rx_dropped++; 386 goto drop; 387 } 388 389 opts_len = geneveh->opt_len * 4; 390 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto, 391 !net_eq(geneve->net, dev_net(geneve->dev)))) { 392 geneve->dev->stats.rx_dropped++; 393 goto drop; 394 } 395 396 geneve_rx(geneve, gs, skb); 397 return 0; 398 399 drop: 400 /* Consume bad packet */ 401 kfree_skb(skb); 402 return 0; 403 } 404 405 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 406 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 407 { 408 struct genevehdr *geneveh; 409 struct geneve_sock *gs; 410 u8 zero_vni[3] = { 0 }; 411 u8 *vni = zero_vni; 412 413 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 414 return -EINVAL; 415 416 geneveh = geneve_hdr(skb); 417 if (geneveh->ver != GENEVE_VER) 418 return -EINVAL; 419 420 if (geneveh->proto_type != htons(ETH_P_TEB)) 421 return -EINVAL; 422 423 gs = rcu_dereference_sk_user_data(sk); 424 if (!gs) 425 return -ENOENT; 426 427 if (geneve_get_sk_family(gs) == AF_INET) { 428 struct iphdr *iph = ip_hdr(skb); 429 __be32 addr4 = 0; 430 431 if (!gs->collect_md) { 432 vni = geneve_hdr(skb)->vni; 433 addr4 = iph->daddr; 434 } 435 436 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 437 } 438 439 #if IS_ENABLED(CONFIG_IPV6) 440 if (geneve_get_sk_family(gs) == AF_INET6) { 441 struct ipv6hdr *ip6h = ipv6_hdr(skb); 442 struct in6_addr addr6; 443 444 memset(&addr6, 0, sizeof(struct in6_addr)); 445 446 if (!gs->collect_md) { 447 vni = geneve_hdr(skb)->vni; 448 addr6 = ip6h->daddr; 449 } 450 451 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 452 } 453 #endif 454 455 return -EPFNOSUPPORT; 456 } 457 458 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 459 __be16 port, bool ipv6_rx_csum) 460 { 461 struct socket *sock; 462 struct udp_port_cfg udp_conf; 463 int err; 464 465 memset(&udp_conf, 0, sizeof(udp_conf)); 466 467 if (ipv6) { 468 udp_conf.family = AF_INET6; 469 udp_conf.ipv6_v6only = 1; 470 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 471 } else { 472 udp_conf.family = AF_INET; 473 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 474 } 475 476 udp_conf.local_udp_port = port; 477 478 /* Open UDP socket */ 479 err = udp_sock_create(net, &udp_conf, &sock); 480 if (err < 0) 481 return ERR_PTR(err); 482 483 udp_allow_gso(sock->sk); 484 return sock; 485 } 486 487 static int geneve_hlen(struct genevehdr *gh) 488 { 489 return sizeof(*gh) + gh->opt_len * 4; 490 } 491 492 static struct sk_buff *geneve_gro_receive(struct sock *sk, 493 struct list_head *head, 494 struct sk_buff *skb) 495 { 496 struct sk_buff *pp = NULL; 497 struct sk_buff *p; 498 struct genevehdr *gh, *gh2; 499 unsigned int hlen, gh_len, off_gnv; 500 const struct packet_offload *ptype; 501 __be16 type; 502 int flush = 1; 503 504 off_gnv = skb_gro_offset(skb); 505 hlen = off_gnv + sizeof(*gh); 506 gh = skb_gro_header_fast(skb, off_gnv); 507 if (skb_gro_header_hard(skb, hlen)) { 508 gh = skb_gro_header_slow(skb, hlen, off_gnv); 509 if (unlikely(!gh)) 510 goto out; 511 } 512 513 if (gh->ver != GENEVE_VER || gh->oam) 514 goto out; 515 gh_len = geneve_hlen(gh); 516 517 hlen = off_gnv + gh_len; 518 if (skb_gro_header_hard(skb, hlen)) { 519 gh = skb_gro_header_slow(skb, hlen, off_gnv); 520 if (unlikely(!gh)) 521 goto out; 522 } 523 524 list_for_each_entry(p, head, list) { 525 if (!NAPI_GRO_CB(p)->same_flow) 526 continue; 527 528 gh2 = (struct genevehdr *)(p->data + off_gnv); 529 if (gh->opt_len != gh2->opt_len || 530 memcmp(gh, gh2, gh_len)) { 531 NAPI_GRO_CB(p)->same_flow = 0; 532 continue; 533 } 534 } 535 536 type = gh->proto_type; 537 538 ptype = gro_find_receive_by_type(type); 539 if (!ptype) 540 goto out; 541 542 skb_gro_pull(skb, gh_len); 543 skb_gro_postpull_rcsum(skb, gh, gh_len); 544 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 545 flush = 0; 546 547 out: 548 skb_gro_flush_final(skb, pp, flush); 549 550 return pp; 551 } 552 553 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 554 int nhoff) 555 { 556 struct genevehdr *gh; 557 struct packet_offload *ptype; 558 __be16 type; 559 int gh_len; 560 int err = -ENOSYS; 561 562 gh = (struct genevehdr *)(skb->data + nhoff); 563 gh_len = geneve_hlen(gh); 564 type = gh->proto_type; 565 566 ptype = gro_find_complete_by_type(type); 567 if (ptype) 568 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 569 570 skb_set_inner_mac_header(skb, nhoff + gh_len); 571 572 return err; 573 } 574 575 /* Create new listen socket if needed */ 576 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 577 bool ipv6, bool ipv6_rx_csum) 578 { 579 struct geneve_net *gn = net_generic(net, geneve_net_id); 580 struct geneve_sock *gs; 581 struct socket *sock; 582 struct udp_tunnel_sock_cfg tunnel_cfg; 583 int h; 584 585 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 586 if (!gs) 587 return ERR_PTR(-ENOMEM); 588 589 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 590 if (IS_ERR(sock)) { 591 kfree(gs); 592 return ERR_CAST(sock); 593 } 594 595 gs->sock = sock; 596 gs->refcnt = 1; 597 for (h = 0; h < VNI_HASH_SIZE; ++h) 598 INIT_HLIST_HEAD(&gs->vni_list[h]); 599 600 /* Initialize the geneve udp offloads structure */ 601 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 602 603 /* Mark socket as an encapsulation socket */ 604 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 605 tunnel_cfg.sk_user_data = gs; 606 tunnel_cfg.encap_type = 1; 607 tunnel_cfg.gro_receive = geneve_gro_receive; 608 tunnel_cfg.gro_complete = geneve_gro_complete; 609 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 610 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 611 tunnel_cfg.encap_destroy = NULL; 612 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 613 list_add(&gs->list, &gn->sock_list); 614 return gs; 615 } 616 617 static void __geneve_sock_release(struct geneve_sock *gs) 618 { 619 if (!gs || --gs->refcnt) 620 return; 621 622 list_del(&gs->list); 623 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 624 udp_tunnel_sock_release(gs->sock); 625 kfree_rcu(gs, rcu); 626 } 627 628 static void geneve_sock_release(struct geneve_dev *geneve) 629 { 630 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 631 #if IS_ENABLED(CONFIG_IPV6) 632 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 633 634 rcu_assign_pointer(geneve->sock6, NULL); 635 #endif 636 637 rcu_assign_pointer(geneve->sock4, NULL); 638 synchronize_net(); 639 640 __geneve_sock_release(gs4); 641 #if IS_ENABLED(CONFIG_IPV6) 642 __geneve_sock_release(gs6); 643 #endif 644 } 645 646 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 647 sa_family_t family, 648 __be16 dst_port) 649 { 650 struct geneve_sock *gs; 651 652 list_for_each_entry(gs, &gn->sock_list, list) { 653 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 654 geneve_get_sk_family(gs) == family) { 655 return gs; 656 } 657 } 658 return NULL; 659 } 660 661 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 662 { 663 struct net *net = geneve->net; 664 struct geneve_net *gn = net_generic(net, geneve_net_id); 665 struct geneve_dev_node *node; 666 struct geneve_sock *gs; 667 __u8 vni[3]; 668 __u32 hash; 669 670 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 671 if (gs) { 672 gs->refcnt++; 673 goto out; 674 } 675 676 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 677 geneve->cfg.use_udp6_rx_checksums); 678 if (IS_ERR(gs)) 679 return PTR_ERR(gs); 680 681 out: 682 gs->collect_md = geneve->cfg.collect_md; 683 #if IS_ENABLED(CONFIG_IPV6) 684 if (ipv6) { 685 rcu_assign_pointer(geneve->sock6, gs); 686 node = &geneve->hlist6; 687 } else 688 #endif 689 { 690 rcu_assign_pointer(geneve->sock4, gs); 691 node = &geneve->hlist4; 692 } 693 node->geneve = geneve; 694 695 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 696 hash = geneve_net_vni_hash(vni); 697 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 698 return 0; 699 } 700 701 static int geneve_open(struct net_device *dev) 702 { 703 struct geneve_dev *geneve = netdev_priv(dev); 704 bool metadata = geneve->cfg.collect_md; 705 bool ipv4, ipv6; 706 int ret = 0; 707 708 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 709 ipv4 = !ipv6 || metadata; 710 #if IS_ENABLED(CONFIG_IPV6) 711 if (ipv6) { 712 ret = geneve_sock_add(geneve, true); 713 if (ret < 0 && ret != -EAFNOSUPPORT) 714 ipv4 = false; 715 } 716 #endif 717 if (ipv4) 718 ret = geneve_sock_add(geneve, false); 719 if (ret < 0) 720 geneve_sock_release(geneve); 721 722 return ret; 723 } 724 725 static int geneve_stop(struct net_device *dev) 726 { 727 struct geneve_dev *geneve = netdev_priv(dev); 728 729 hlist_del_init_rcu(&geneve->hlist4.hlist); 730 #if IS_ENABLED(CONFIG_IPV6) 731 hlist_del_init_rcu(&geneve->hlist6.hlist); 732 #endif 733 geneve_sock_release(geneve); 734 return 0; 735 } 736 737 static void geneve_build_header(struct genevehdr *geneveh, 738 const struct ip_tunnel_info *info, 739 __be16 inner_proto) 740 { 741 geneveh->ver = GENEVE_VER; 742 geneveh->opt_len = info->options_len / 4; 743 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 744 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 745 geneveh->rsvd1 = 0; 746 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 747 geneveh->proto_type = inner_proto; 748 geneveh->rsvd2 = 0; 749 750 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 751 ip_tunnel_info_opts_get(geneveh->options, info); 752 } 753 754 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 755 const struct ip_tunnel_info *info, 756 bool xnet, int ip_hdr_len, 757 bool inner_proto_inherit) 758 { 759 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 760 struct genevehdr *gnvh; 761 __be16 inner_proto; 762 int min_headroom; 763 int err; 764 765 skb_reset_mac_header(skb); 766 skb_scrub_packet(skb, xnet); 767 768 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 769 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 770 err = skb_cow_head(skb, min_headroom); 771 if (unlikely(err)) 772 goto free_dst; 773 774 err = udp_tunnel_handle_offloads(skb, udp_sum); 775 if (err) 776 goto free_dst; 777 778 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 779 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB); 780 geneve_build_header(gnvh, info, inner_proto); 781 skb_set_inner_protocol(skb, inner_proto); 782 return 0; 783 784 free_dst: 785 dst_release(dst); 786 return err; 787 } 788 789 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 790 struct net_device *dev, 791 struct geneve_sock *gs4, 792 struct flowi4 *fl4, 793 const struct ip_tunnel_info *info, 794 __be16 dport, __be16 sport) 795 { 796 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 797 struct geneve_dev *geneve = netdev_priv(dev); 798 struct dst_cache *dst_cache; 799 struct rtable *rt = NULL; 800 __u8 tos; 801 802 if (!gs4) 803 return ERR_PTR(-EIO); 804 805 memset(fl4, 0, sizeof(*fl4)); 806 fl4->flowi4_mark = skb->mark; 807 fl4->flowi4_proto = IPPROTO_UDP; 808 fl4->daddr = info->key.u.ipv4.dst; 809 fl4->saddr = info->key.u.ipv4.src; 810 fl4->fl4_dport = dport; 811 fl4->fl4_sport = sport; 812 813 tos = info->key.tos; 814 if ((tos == 1) && !geneve->cfg.collect_md) { 815 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 816 use_cache = false; 817 } 818 fl4->flowi4_tos = RT_TOS(tos); 819 820 dst_cache = (struct dst_cache *)&info->dst_cache; 821 if (use_cache) { 822 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 823 if (rt) 824 return rt; 825 } 826 rt = ip_route_output_key(geneve->net, fl4); 827 if (IS_ERR(rt)) { 828 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 829 return ERR_PTR(-ENETUNREACH); 830 } 831 if (rt->dst.dev == dev) { /* is this necessary? */ 832 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 833 ip_rt_put(rt); 834 return ERR_PTR(-ELOOP); 835 } 836 if (use_cache) 837 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 838 return rt; 839 } 840 841 #if IS_ENABLED(CONFIG_IPV6) 842 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 843 struct net_device *dev, 844 struct geneve_sock *gs6, 845 struct flowi6 *fl6, 846 const struct ip_tunnel_info *info, 847 __be16 dport, __be16 sport) 848 { 849 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 850 struct geneve_dev *geneve = netdev_priv(dev); 851 struct dst_entry *dst = NULL; 852 struct dst_cache *dst_cache; 853 __u8 prio; 854 855 if (!gs6) 856 return ERR_PTR(-EIO); 857 858 memset(fl6, 0, sizeof(*fl6)); 859 fl6->flowi6_mark = skb->mark; 860 fl6->flowi6_proto = IPPROTO_UDP; 861 fl6->daddr = info->key.u.ipv6.dst; 862 fl6->saddr = info->key.u.ipv6.src; 863 fl6->fl6_dport = dport; 864 fl6->fl6_sport = sport; 865 866 prio = info->key.tos; 867 if ((prio == 1) && !geneve->cfg.collect_md) { 868 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 869 use_cache = false; 870 } 871 872 fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), 873 info->key.label); 874 dst_cache = (struct dst_cache *)&info->dst_cache; 875 if (use_cache) { 876 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 877 if (dst) 878 return dst; 879 } 880 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, 881 NULL); 882 if (IS_ERR(dst)) { 883 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 884 return ERR_PTR(-ENETUNREACH); 885 } 886 if (dst->dev == dev) { /* is this necessary? */ 887 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 888 dst_release(dst); 889 return ERR_PTR(-ELOOP); 890 } 891 892 if (use_cache) 893 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 894 return dst; 895 } 896 #endif 897 898 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 899 struct geneve_dev *geneve, 900 const struct ip_tunnel_info *info) 901 { 902 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 903 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 904 const struct ip_tunnel_key *key = &info->key; 905 struct rtable *rt; 906 struct flowi4 fl4; 907 __u8 tos, ttl; 908 __be16 df = 0; 909 __be16 sport; 910 int err; 911 912 if (!pskb_inet_may_pull(skb)) 913 return -EINVAL; 914 915 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 916 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 917 geneve->cfg.info.key.tp_dst, sport); 918 if (IS_ERR(rt)) 919 return PTR_ERR(rt); 920 921 err = skb_tunnel_check_pmtu(skb, &rt->dst, 922 GENEVE_IPV4_HLEN + info->options_len, 923 netif_is_any_bridge_port(dev)); 924 if (err < 0) { 925 dst_release(&rt->dst); 926 return err; 927 } else if (err) { 928 struct ip_tunnel_info *info; 929 930 info = skb_tunnel_info(skb); 931 if (info) { 932 struct ip_tunnel_info *unclone; 933 934 unclone = skb_tunnel_info_unclone(skb); 935 if (unlikely(!unclone)) { 936 dst_release(&rt->dst); 937 return -ENOMEM; 938 } 939 940 unclone->key.u.ipv4.dst = fl4.saddr; 941 unclone->key.u.ipv4.src = fl4.daddr; 942 } 943 944 if (!pskb_may_pull(skb, ETH_HLEN)) { 945 dst_release(&rt->dst); 946 return -EINVAL; 947 } 948 949 skb->protocol = eth_type_trans(skb, geneve->dev); 950 __netif_rx(skb); 951 dst_release(&rt->dst); 952 return -EMSGSIZE; 953 } 954 955 if (geneve->cfg.collect_md) { 956 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 957 ttl = key->ttl; 958 959 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 960 } else { 961 tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); 962 if (geneve->cfg.ttl_inherit) 963 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 964 else 965 ttl = key->ttl; 966 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 967 968 if (geneve->cfg.df == GENEVE_DF_SET) { 969 df = htons(IP_DF); 970 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 971 struct ethhdr *eth = eth_hdr(skb); 972 973 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 974 df = htons(IP_DF); 975 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 976 struct iphdr *iph = ip_hdr(skb); 977 978 if (iph->frag_off & htons(IP_DF)) 979 df = htons(IP_DF); 980 } 981 } 982 } 983 984 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr), 985 geneve->cfg.inner_proto_inherit); 986 if (unlikely(err)) 987 return err; 988 989 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 990 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 991 !net_eq(geneve->net, dev_net(geneve->dev)), 992 !(info->key.tun_flags & TUNNEL_CSUM)); 993 return 0; 994 } 995 996 #if IS_ENABLED(CONFIG_IPV6) 997 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 998 struct geneve_dev *geneve, 999 const struct ip_tunnel_info *info) 1000 { 1001 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 1002 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1003 const struct ip_tunnel_key *key = &info->key; 1004 struct dst_entry *dst = NULL; 1005 struct flowi6 fl6; 1006 __u8 prio, ttl; 1007 __be16 sport; 1008 int err; 1009 1010 if (!pskb_inet_may_pull(skb)) 1011 return -EINVAL; 1012 1013 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 1014 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1015 geneve->cfg.info.key.tp_dst, sport); 1016 if (IS_ERR(dst)) 1017 return PTR_ERR(dst); 1018 1019 err = skb_tunnel_check_pmtu(skb, dst, 1020 GENEVE_IPV6_HLEN + info->options_len, 1021 netif_is_any_bridge_port(dev)); 1022 if (err < 0) { 1023 dst_release(dst); 1024 return err; 1025 } else if (err) { 1026 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1027 1028 if (info) { 1029 struct ip_tunnel_info *unclone; 1030 1031 unclone = skb_tunnel_info_unclone(skb); 1032 if (unlikely(!unclone)) { 1033 dst_release(dst); 1034 return -ENOMEM; 1035 } 1036 1037 unclone->key.u.ipv6.dst = fl6.saddr; 1038 unclone->key.u.ipv6.src = fl6.daddr; 1039 } 1040 1041 if (!pskb_may_pull(skb, ETH_HLEN)) { 1042 dst_release(dst); 1043 return -EINVAL; 1044 } 1045 1046 skb->protocol = eth_type_trans(skb, geneve->dev); 1047 __netif_rx(skb); 1048 dst_release(dst); 1049 return -EMSGSIZE; 1050 } 1051 1052 if (geneve->cfg.collect_md) { 1053 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 1054 ttl = key->ttl; 1055 } else { 1056 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1057 ip_hdr(skb), skb); 1058 if (geneve->cfg.ttl_inherit) 1059 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1060 else 1061 ttl = key->ttl; 1062 ttl = ttl ? : ip6_dst_hoplimit(dst); 1063 } 1064 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr), 1065 geneve->cfg.inner_proto_inherit); 1066 if (unlikely(err)) 1067 return err; 1068 1069 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1070 &fl6.saddr, &fl6.daddr, prio, ttl, 1071 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1072 !(info->key.tun_flags & TUNNEL_CSUM)); 1073 return 0; 1074 } 1075 #endif 1076 1077 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1078 { 1079 struct geneve_dev *geneve = netdev_priv(dev); 1080 struct ip_tunnel_info *info = NULL; 1081 int err; 1082 1083 if (geneve->cfg.collect_md) { 1084 info = skb_tunnel_info(skb); 1085 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1086 netdev_dbg(dev, "no tunnel metadata\n"); 1087 dev_kfree_skb(skb); 1088 dev->stats.tx_dropped++; 1089 return NETDEV_TX_OK; 1090 } 1091 } else { 1092 info = &geneve->cfg.info; 1093 } 1094 1095 rcu_read_lock(); 1096 #if IS_ENABLED(CONFIG_IPV6) 1097 if (info->mode & IP_TUNNEL_INFO_IPV6) 1098 err = geneve6_xmit_skb(skb, dev, geneve, info); 1099 else 1100 #endif 1101 err = geneve_xmit_skb(skb, dev, geneve, info); 1102 rcu_read_unlock(); 1103 1104 if (likely(!err)) 1105 return NETDEV_TX_OK; 1106 1107 if (err != -EMSGSIZE) 1108 dev_kfree_skb(skb); 1109 1110 if (err == -ELOOP) 1111 dev->stats.collisions++; 1112 else if (err == -ENETUNREACH) 1113 dev->stats.tx_carrier_errors++; 1114 1115 dev->stats.tx_errors++; 1116 return NETDEV_TX_OK; 1117 } 1118 1119 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1120 { 1121 if (new_mtu > dev->max_mtu) 1122 new_mtu = dev->max_mtu; 1123 else if (new_mtu < dev->min_mtu) 1124 new_mtu = dev->min_mtu; 1125 1126 dev->mtu = new_mtu; 1127 return 0; 1128 } 1129 1130 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1131 { 1132 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1133 struct geneve_dev *geneve = netdev_priv(dev); 1134 __be16 sport; 1135 1136 if (ip_tunnel_info_af(info) == AF_INET) { 1137 struct rtable *rt; 1138 struct flowi4 fl4; 1139 1140 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1141 sport = udp_flow_src_port(geneve->net, skb, 1142 1, USHRT_MAX, true); 1143 1144 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 1145 geneve->cfg.info.key.tp_dst, sport); 1146 if (IS_ERR(rt)) 1147 return PTR_ERR(rt); 1148 1149 ip_rt_put(rt); 1150 info->key.u.ipv4.src = fl4.saddr; 1151 #if IS_ENABLED(CONFIG_IPV6) 1152 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1153 struct dst_entry *dst; 1154 struct flowi6 fl6; 1155 1156 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1157 sport = udp_flow_src_port(geneve->net, skb, 1158 1, USHRT_MAX, true); 1159 1160 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1161 geneve->cfg.info.key.tp_dst, sport); 1162 if (IS_ERR(dst)) 1163 return PTR_ERR(dst); 1164 1165 dst_release(dst); 1166 info->key.u.ipv6.src = fl6.saddr; 1167 #endif 1168 } else { 1169 return -EINVAL; 1170 } 1171 1172 info->key.tp_src = sport; 1173 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1174 return 0; 1175 } 1176 1177 static const struct net_device_ops geneve_netdev_ops = { 1178 .ndo_init = geneve_init, 1179 .ndo_uninit = geneve_uninit, 1180 .ndo_open = geneve_open, 1181 .ndo_stop = geneve_stop, 1182 .ndo_start_xmit = geneve_xmit, 1183 .ndo_get_stats64 = dev_get_tstats64, 1184 .ndo_change_mtu = geneve_change_mtu, 1185 .ndo_validate_addr = eth_validate_addr, 1186 .ndo_set_mac_address = eth_mac_addr, 1187 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1188 }; 1189 1190 static void geneve_get_drvinfo(struct net_device *dev, 1191 struct ethtool_drvinfo *drvinfo) 1192 { 1193 strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1194 strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1195 } 1196 1197 static const struct ethtool_ops geneve_ethtool_ops = { 1198 .get_drvinfo = geneve_get_drvinfo, 1199 .get_link = ethtool_op_get_link, 1200 }; 1201 1202 /* Info for udev, that this is a virtual tunnel endpoint */ 1203 static struct device_type geneve_type = { 1204 .name = "geneve", 1205 }; 1206 1207 /* Calls the ndo_udp_tunnel_add of the caller in order to 1208 * supply the listening GENEVE udp ports. Callers are expected 1209 * to implement the ndo_udp_tunnel_add. 1210 */ 1211 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1212 { 1213 struct net *net = dev_net(dev); 1214 struct geneve_net *gn = net_generic(net, geneve_net_id); 1215 struct geneve_sock *gs; 1216 1217 rcu_read_lock(); 1218 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1219 if (push) { 1220 udp_tunnel_push_rx_port(dev, gs->sock, 1221 UDP_TUNNEL_TYPE_GENEVE); 1222 } else { 1223 udp_tunnel_drop_rx_port(dev, gs->sock, 1224 UDP_TUNNEL_TYPE_GENEVE); 1225 } 1226 } 1227 rcu_read_unlock(); 1228 } 1229 1230 /* Initialize the device structure. */ 1231 static void geneve_setup(struct net_device *dev) 1232 { 1233 ether_setup(dev); 1234 1235 dev->netdev_ops = &geneve_netdev_ops; 1236 dev->ethtool_ops = &geneve_ethtool_ops; 1237 dev->needs_free_netdev = true; 1238 1239 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1240 1241 dev->features |= NETIF_F_LLTX; 1242 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1243 dev->features |= NETIF_F_RXCSUM; 1244 dev->features |= NETIF_F_GSO_SOFTWARE; 1245 1246 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1247 dev->hw_features |= NETIF_F_RXCSUM; 1248 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1249 1250 /* MTU range: 68 - (something less than 65535) */ 1251 dev->min_mtu = ETH_MIN_MTU; 1252 /* The max_mtu calculation does not take account of GENEVE 1253 * options, to avoid excluding potentially valid 1254 * configurations. This will be further reduced by IPvX hdr size. 1255 */ 1256 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1257 1258 netif_keep_dst(dev); 1259 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1260 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1261 eth_hw_addr_random(dev); 1262 } 1263 1264 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1265 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, 1266 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1267 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1268 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1269 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1270 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1271 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1272 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1273 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1274 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1275 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1276 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1277 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1278 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1279 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, 1280 }; 1281 1282 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1283 struct netlink_ext_ack *extack) 1284 { 1285 if (tb[IFLA_ADDRESS]) { 1286 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1287 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1288 "Provided link layer address is not Ethernet"); 1289 return -EINVAL; 1290 } 1291 1292 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1293 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1294 "Provided Ethernet address is not unicast"); 1295 return -EADDRNOTAVAIL; 1296 } 1297 } 1298 1299 if (!data) { 1300 NL_SET_ERR_MSG(extack, 1301 "Not enough attributes provided to perform the operation"); 1302 return -EINVAL; 1303 } 1304 1305 if (data[IFLA_GENEVE_ID]) { 1306 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1307 1308 if (vni >= GENEVE_N_VID) { 1309 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1310 "Geneve ID must be lower than 16777216"); 1311 return -ERANGE; 1312 } 1313 } 1314 1315 if (data[IFLA_GENEVE_DF]) { 1316 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1317 1318 if (df < 0 || df > GENEVE_DF_MAX) { 1319 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1320 "Invalid DF attribute"); 1321 return -EINVAL; 1322 } 1323 } 1324 1325 return 0; 1326 } 1327 1328 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1329 const struct ip_tunnel_info *info, 1330 bool *tun_on_same_port, 1331 bool *tun_collect_md) 1332 { 1333 struct geneve_dev *geneve, *t = NULL; 1334 1335 *tun_on_same_port = false; 1336 *tun_collect_md = false; 1337 list_for_each_entry(geneve, &gn->geneve_list, next) { 1338 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1339 *tun_collect_md = geneve->cfg.collect_md; 1340 *tun_on_same_port = true; 1341 } 1342 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1343 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1344 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1345 t = geneve; 1346 } 1347 return t; 1348 } 1349 1350 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1351 { 1352 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1353 info->key.ttl || info->key.label || info->key.tp_src || 1354 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1355 } 1356 1357 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1358 struct ip_tunnel_info *b) 1359 { 1360 if (ip_tunnel_info_af(a) == AF_INET) 1361 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1362 else 1363 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1364 } 1365 1366 static int geneve_configure(struct net *net, struct net_device *dev, 1367 struct netlink_ext_ack *extack, 1368 const struct geneve_config *cfg) 1369 { 1370 struct geneve_net *gn = net_generic(net, geneve_net_id); 1371 struct geneve_dev *t, *geneve = netdev_priv(dev); 1372 const struct ip_tunnel_info *info = &cfg->info; 1373 bool tun_collect_md, tun_on_same_port; 1374 int err, encap_len; 1375 1376 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1377 NL_SET_ERR_MSG(extack, 1378 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1379 return -EINVAL; 1380 } 1381 1382 geneve->net = net; 1383 geneve->dev = dev; 1384 1385 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1386 if (t) 1387 return -EBUSY; 1388 1389 /* make enough headroom for basic scenario */ 1390 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1391 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1392 encap_len += sizeof(struct iphdr); 1393 dev->max_mtu -= sizeof(struct iphdr); 1394 } else { 1395 encap_len += sizeof(struct ipv6hdr); 1396 dev->max_mtu -= sizeof(struct ipv6hdr); 1397 } 1398 dev->needed_headroom = encap_len + ETH_HLEN; 1399 1400 if (cfg->collect_md) { 1401 if (tun_on_same_port) { 1402 NL_SET_ERR_MSG(extack, 1403 "There can be only one externally controlled device on a destination port"); 1404 return -EPERM; 1405 } 1406 } else { 1407 if (tun_collect_md) { 1408 NL_SET_ERR_MSG(extack, 1409 "There already exists an externally controlled device on this destination port"); 1410 return -EPERM; 1411 } 1412 } 1413 1414 dst_cache_reset(&geneve->cfg.info.dst_cache); 1415 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1416 1417 if (geneve->cfg.inner_proto_inherit) { 1418 dev->header_ops = NULL; 1419 dev->type = ARPHRD_NONE; 1420 dev->hard_header_len = 0; 1421 dev->addr_len = 0; 1422 dev->flags = IFF_NOARP; 1423 } 1424 1425 err = register_netdevice(dev); 1426 if (err) 1427 return err; 1428 1429 list_add(&geneve->next, &gn->geneve_list); 1430 return 0; 1431 } 1432 1433 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1434 { 1435 memset(info, 0, sizeof(*info)); 1436 info->key.tp_dst = htons(dst_port); 1437 } 1438 1439 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1440 struct netlink_ext_ack *extack, 1441 struct geneve_config *cfg, bool changelink) 1442 { 1443 struct ip_tunnel_info *info = &cfg->info; 1444 int attrtype; 1445 1446 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1447 NL_SET_ERR_MSG(extack, 1448 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1449 return -EINVAL; 1450 } 1451 1452 if (data[IFLA_GENEVE_REMOTE]) { 1453 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1454 attrtype = IFLA_GENEVE_REMOTE; 1455 goto change_notsup; 1456 } 1457 1458 info->key.u.ipv4.dst = 1459 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1460 1461 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1462 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1463 "Remote IPv4 address cannot be Multicast"); 1464 return -EINVAL; 1465 } 1466 } 1467 1468 if (data[IFLA_GENEVE_REMOTE6]) { 1469 #if IS_ENABLED(CONFIG_IPV6) 1470 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1471 attrtype = IFLA_GENEVE_REMOTE6; 1472 goto change_notsup; 1473 } 1474 1475 info->mode = IP_TUNNEL_INFO_IPV6; 1476 info->key.u.ipv6.dst = 1477 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1478 1479 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1480 IPV6_ADDR_LINKLOCAL) { 1481 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1482 "Remote IPv6 address cannot be link-local"); 1483 return -EINVAL; 1484 } 1485 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1486 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1487 "Remote IPv6 address cannot be Multicast"); 1488 return -EINVAL; 1489 } 1490 info->key.tun_flags |= TUNNEL_CSUM; 1491 cfg->use_udp6_rx_checksums = true; 1492 #else 1493 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1494 "IPv6 support not enabled in the kernel"); 1495 return -EPFNOSUPPORT; 1496 #endif 1497 } 1498 1499 if (data[IFLA_GENEVE_ID]) { 1500 __u32 vni; 1501 __u8 tvni[3]; 1502 __be64 tunid; 1503 1504 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1505 tvni[0] = (vni & 0x00ff0000) >> 16; 1506 tvni[1] = (vni & 0x0000ff00) >> 8; 1507 tvni[2] = vni & 0x000000ff; 1508 1509 tunid = vni_to_tunnel_id(tvni); 1510 if (changelink && (tunid != info->key.tun_id)) { 1511 attrtype = IFLA_GENEVE_ID; 1512 goto change_notsup; 1513 } 1514 info->key.tun_id = tunid; 1515 } 1516 1517 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1518 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1519 cfg->ttl_inherit = true; 1520 else 1521 cfg->ttl_inherit = false; 1522 } else if (data[IFLA_GENEVE_TTL]) { 1523 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1524 cfg->ttl_inherit = false; 1525 } 1526 1527 if (data[IFLA_GENEVE_TOS]) 1528 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1529 1530 if (data[IFLA_GENEVE_DF]) 1531 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1532 1533 if (data[IFLA_GENEVE_LABEL]) { 1534 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1535 IPV6_FLOWLABEL_MASK; 1536 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1537 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1538 "Label attribute only applies for IPv6 Geneve devices"); 1539 return -EINVAL; 1540 } 1541 } 1542 1543 if (data[IFLA_GENEVE_PORT]) { 1544 if (changelink) { 1545 attrtype = IFLA_GENEVE_PORT; 1546 goto change_notsup; 1547 } 1548 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1549 } 1550 1551 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1552 if (changelink) { 1553 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1554 goto change_notsup; 1555 } 1556 cfg->collect_md = true; 1557 } 1558 1559 if (data[IFLA_GENEVE_UDP_CSUM]) { 1560 if (changelink) { 1561 attrtype = IFLA_GENEVE_UDP_CSUM; 1562 goto change_notsup; 1563 } 1564 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1565 info->key.tun_flags |= TUNNEL_CSUM; 1566 } 1567 1568 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1569 #if IS_ENABLED(CONFIG_IPV6) 1570 if (changelink) { 1571 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1572 goto change_notsup; 1573 } 1574 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1575 info->key.tun_flags &= ~TUNNEL_CSUM; 1576 #else 1577 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1578 "IPv6 support not enabled in the kernel"); 1579 return -EPFNOSUPPORT; 1580 #endif 1581 } 1582 1583 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1584 #if IS_ENABLED(CONFIG_IPV6) 1585 if (changelink) { 1586 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1587 goto change_notsup; 1588 } 1589 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1590 cfg->use_udp6_rx_checksums = false; 1591 #else 1592 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1593 "IPv6 support not enabled in the kernel"); 1594 return -EPFNOSUPPORT; 1595 #endif 1596 } 1597 1598 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { 1599 if (changelink) { 1600 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; 1601 goto change_notsup; 1602 } 1603 cfg->inner_proto_inherit = true; 1604 } 1605 1606 return 0; 1607 change_notsup: 1608 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1609 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported"); 1610 return -EOPNOTSUPP; 1611 } 1612 1613 static void geneve_link_config(struct net_device *dev, 1614 struct ip_tunnel_info *info, struct nlattr *tb[]) 1615 { 1616 struct geneve_dev *geneve = netdev_priv(dev); 1617 int ldev_mtu = 0; 1618 1619 if (tb[IFLA_MTU]) { 1620 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1621 return; 1622 } 1623 1624 switch (ip_tunnel_info_af(info)) { 1625 case AF_INET: { 1626 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1627 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1628 1629 if (!IS_ERR(rt) && rt->dst.dev) { 1630 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1631 ip_rt_put(rt); 1632 } 1633 break; 1634 } 1635 #if IS_ENABLED(CONFIG_IPV6) 1636 case AF_INET6: { 1637 struct rt6_info *rt; 1638 1639 if (!__in6_dev_get(dev)) 1640 break; 1641 1642 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1643 NULL, 0); 1644 1645 if (rt && rt->dst.dev) 1646 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1647 ip6_rt_put(rt); 1648 break; 1649 } 1650 #endif 1651 } 1652 1653 if (ldev_mtu <= 0) 1654 return; 1655 1656 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1657 } 1658 1659 static int geneve_newlink(struct net *net, struct net_device *dev, 1660 struct nlattr *tb[], struct nlattr *data[], 1661 struct netlink_ext_ack *extack) 1662 { 1663 struct geneve_config cfg = { 1664 .df = GENEVE_DF_UNSET, 1665 .use_udp6_rx_checksums = false, 1666 .ttl_inherit = false, 1667 .collect_md = false, 1668 }; 1669 int err; 1670 1671 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1672 err = geneve_nl2info(tb, data, extack, &cfg, false); 1673 if (err) 1674 return err; 1675 1676 err = geneve_configure(net, dev, extack, &cfg); 1677 if (err) 1678 return err; 1679 1680 geneve_link_config(dev, &cfg.info, tb); 1681 1682 return 0; 1683 } 1684 1685 /* Quiesces the geneve device data path for both TX and RX. 1686 * 1687 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1688 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1689 * to complete for the existing set of in-flight packets to be transmitted, 1690 * then we would have quiesced the transmit data path. All the future packets 1691 * will get dropped until we unquiesce the data path. 1692 * 1693 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1694 * if we set that to NULL under RCU and wait for synchronize_net() to 1695 * complete, then we would have quiesced the receive data path. 1696 */ 1697 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1698 struct geneve_sock **gs6) 1699 { 1700 *gs4 = rtnl_dereference(geneve->sock4); 1701 rcu_assign_pointer(geneve->sock4, NULL); 1702 if (*gs4) 1703 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1704 #if IS_ENABLED(CONFIG_IPV6) 1705 *gs6 = rtnl_dereference(geneve->sock6); 1706 rcu_assign_pointer(geneve->sock6, NULL); 1707 if (*gs6) 1708 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1709 #else 1710 *gs6 = NULL; 1711 #endif 1712 synchronize_net(); 1713 } 1714 1715 /* Resumes the geneve device data path for both TX and RX. */ 1716 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1717 struct geneve_sock __maybe_unused *gs6) 1718 { 1719 rcu_assign_pointer(geneve->sock4, gs4); 1720 if (gs4) 1721 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1722 #if IS_ENABLED(CONFIG_IPV6) 1723 rcu_assign_pointer(geneve->sock6, gs6); 1724 if (gs6) 1725 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1726 #endif 1727 synchronize_net(); 1728 } 1729 1730 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1731 struct nlattr *data[], 1732 struct netlink_ext_ack *extack) 1733 { 1734 struct geneve_dev *geneve = netdev_priv(dev); 1735 struct geneve_sock *gs4, *gs6; 1736 struct geneve_config cfg; 1737 int err; 1738 1739 /* If the geneve device is configured for metadata (or externally 1740 * controlled, for example, OVS), then nothing can be changed. 1741 */ 1742 if (geneve->cfg.collect_md) 1743 return -EOPNOTSUPP; 1744 1745 /* Start with the existing info. */ 1746 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1747 err = geneve_nl2info(tb, data, extack, &cfg, true); 1748 if (err) 1749 return err; 1750 1751 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1752 dst_cache_reset(&cfg.info.dst_cache); 1753 geneve_link_config(dev, &cfg.info, tb); 1754 } 1755 1756 geneve_quiesce(geneve, &gs4, &gs6); 1757 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1758 geneve_unquiesce(geneve, gs4, gs6); 1759 1760 return 0; 1761 } 1762 1763 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1764 { 1765 struct geneve_dev *geneve = netdev_priv(dev); 1766 1767 list_del(&geneve->next); 1768 unregister_netdevice_queue(dev, head); 1769 } 1770 1771 static size_t geneve_get_size(const struct net_device *dev) 1772 { 1773 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1774 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1775 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1776 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1777 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1778 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1779 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1780 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1781 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1782 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1783 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1784 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1785 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ 1786 0; 1787 } 1788 1789 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1790 { 1791 struct geneve_dev *geneve = netdev_priv(dev); 1792 struct ip_tunnel_info *info = &geneve->cfg.info; 1793 bool ttl_inherit = geneve->cfg.ttl_inherit; 1794 bool metadata = geneve->cfg.collect_md; 1795 __u8 tmp_vni[3]; 1796 __u32 vni; 1797 1798 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1799 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1800 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1801 goto nla_put_failure; 1802 1803 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1804 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1805 info->key.u.ipv4.dst)) 1806 goto nla_put_failure; 1807 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1808 !!(info->key.tun_flags & TUNNEL_CSUM))) 1809 goto nla_put_failure; 1810 1811 #if IS_ENABLED(CONFIG_IPV6) 1812 } else if (!metadata) { 1813 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1814 &info->key.u.ipv6.dst)) 1815 goto nla_put_failure; 1816 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1817 !(info->key.tun_flags & TUNNEL_CSUM))) 1818 goto nla_put_failure; 1819 #endif 1820 } 1821 1822 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1823 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1824 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1825 goto nla_put_failure; 1826 1827 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1828 goto nla_put_failure; 1829 1830 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1831 goto nla_put_failure; 1832 1833 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1834 goto nla_put_failure; 1835 1836 #if IS_ENABLED(CONFIG_IPV6) 1837 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1838 !geneve->cfg.use_udp6_rx_checksums)) 1839 goto nla_put_failure; 1840 #endif 1841 1842 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1843 goto nla_put_failure; 1844 1845 if (geneve->cfg.inner_proto_inherit && 1846 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) 1847 goto nla_put_failure; 1848 1849 return 0; 1850 1851 nla_put_failure: 1852 return -EMSGSIZE; 1853 } 1854 1855 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1856 .kind = "geneve", 1857 .maxtype = IFLA_GENEVE_MAX, 1858 .policy = geneve_policy, 1859 .priv_size = sizeof(struct geneve_dev), 1860 .setup = geneve_setup, 1861 .validate = geneve_validate, 1862 .newlink = geneve_newlink, 1863 .changelink = geneve_changelink, 1864 .dellink = geneve_dellink, 1865 .get_size = geneve_get_size, 1866 .fill_info = geneve_fill_info, 1867 }; 1868 1869 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1870 u8 name_assign_type, u16 dst_port) 1871 { 1872 struct nlattr *tb[IFLA_MAX + 1]; 1873 struct net_device *dev; 1874 LIST_HEAD(list_kill); 1875 int err; 1876 struct geneve_config cfg = { 1877 .df = GENEVE_DF_UNSET, 1878 .use_udp6_rx_checksums = true, 1879 .ttl_inherit = false, 1880 .collect_md = true, 1881 }; 1882 1883 memset(tb, 0, sizeof(tb)); 1884 dev = rtnl_create_link(net, name, name_assign_type, 1885 &geneve_link_ops, tb, NULL); 1886 if (IS_ERR(dev)) 1887 return dev; 1888 1889 init_tnl_info(&cfg.info, dst_port); 1890 err = geneve_configure(net, dev, NULL, &cfg); 1891 if (err) { 1892 free_netdev(dev); 1893 return ERR_PTR(err); 1894 } 1895 1896 /* openvswitch users expect packet sizes to be unrestricted, 1897 * so set the largest MTU we can. 1898 */ 1899 err = geneve_change_mtu(dev, IP_MAX_MTU); 1900 if (err) 1901 goto err; 1902 1903 err = rtnl_configure_link(dev, NULL); 1904 if (err < 0) 1905 goto err; 1906 1907 return dev; 1908 err: 1909 geneve_dellink(dev, &list_kill); 1910 unregister_netdevice_many(&list_kill); 1911 return ERR_PTR(err); 1912 } 1913 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1914 1915 static int geneve_netdevice_event(struct notifier_block *unused, 1916 unsigned long event, void *ptr) 1917 { 1918 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1919 1920 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1921 geneve_offload_rx_ports(dev, true); 1922 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 1923 geneve_offload_rx_ports(dev, false); 1924 1925 return NOTIFY_DONE; 1926 } 1927 1928 static struct notifier_block geneve_notifier_block __read_mostly = { 1929 .notifier_call = geneve_netdevice_event, 1930 }; 1931 1932 static __net_init int geneve_init_net(struct net *net) 1933 { 1934 struct geneve_net *gn = net_generic(net, geneve_net_id); 1935 1936 INIT_LIST_HEAD(&gn->geneve_list); 1937 INIT_LIST_HEAD(&gn->sock_list); 1938 return 0; 1939 } 1940 1941 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1942 { 1943 struct geneve_net *gn = net_generic(net, geneve_net_id); 1944 struct geneve_dev *geneve, *next; 1945 struct net_device *dev, *aux; 1946 1947 /* gather any geneve devices that were moved into this ns */ 1948 for_each_netdev_safe(net, dev, aux) 1949 if (dev->rtnl_link_ops == &geneve_link_ops) 1950 unregister_netdevice_queue(dev, head); 1951 1952 /* now gather any other geneve devices that were created in this ns */ 1953 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1954 /* If geneve->dev is in the same netns, it was already added 1955 * to the list by the previous loop. 1956 */ 1957 if (!net_eq(dev_net(geneve->dev), net)) 1958 unregister_netdevice_queue(geneve->dev, head); 1959 } 1960 } 1961 1962 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1963 { 1964 struct net *net; 1965 LIST_HEAD(list); 1966 1967 rtnl_lock(); 1968 list_for_each_entry(net, net_list, exit_list) 1969 geneve_destroy_tunnels(net, &list); 1970 1971 /* unregister the devices gathered above */ 1972 unregister_netdevice_many(&list); 1973 rtnl_unlock(); 1974 1975 list_for_each_entry(net, net_list, exit_list) { 1976 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1977 1978 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1979 } 1980 } 1981 1982 static struct pernet_operations geneve_net_ops = { 1983 .init = geneve_init_net, 1984 .exit_batch = geneve_exit_batch_net, 1985 .id = &geneve_net_id, 1986 .size = sizeof(struct geneve_net), 1987 }; 1988 1989 static int __init geneve_init_module(void) 1990 { 1991 int rc; 1992 1993 rc = register_pernet_subsys(&geneve_net_ops); 1994 if (rc) 1995 goto out1; 1996 1997 rc = register_netdevice_notifier(&geneve_notifier_block); 1998 if (rc) 1999 goto out2; 2000 2001 rc = rtnl_link_register(&geneve_link_ops); 2002 if (rc) 2003 goto out3; 2004 2005 return 0; 2006 out3: 2007 unregister_netdevice_notifier(&geneve_notifier_block); 2008 out2: 2009 unregister_pernet_subsys(&geneve_net_ops); 2010 out1: 2011 return rc; 2012 } 2013 late_initcall(geneve_init_module); 2014 2015 static void __exit geneve_cleanup_module(void) 2016 { 2017 rtnl_link_unregister(&geneve_link_ops); 2018 unregister_netdevice_notifier(&geneve_notifier_block); 2019 unregister_pernet_subsys(&geneve_net_ops); 2020 } 2021 module_exit(geneve_cleanup_module); 2022 2023 MODULE_LICENSE("GPL"); 2024 MODULE_VERSION(GENEVE_NETDEV_VER); 2025 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 2026 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 2027 MODULE_ALIAS_RTNL_LINK("geneve"); 2028