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(skb, hlen, off_gnv); 507 if (unlikely(!gh)) 508 goto out; 509 510 if (gh->ver != GENEVE_VER || gh->oam) 511 goto out; 512 gh_len = geneve_hlen(gh); 513 514 hlen = off_gnv + gh_len; 515 if (skb_gro_header_hard(skb, hlen)) { 516 gh = skb_gro_header_slow(skb, hlen, off_gnv); 517 if (unlikely(!gh)) 518 goto out; 519 } 520 521 list_for_each_entry(p, head, list) { 522 if (!NAPI_GRO_CB(p)->same_flow) 523 continue; 524 525 gh2 = (struct genevehdr *)(p->data + off_gnv); 526 if (gh->opt_len != gh2->opt_len || 527 memcmp(gh, gh2, gh_len)) { 528 NAPI_GRO_CB(p)->same_flow = 0; 529 continue; 530 } 531 } 532 533 skb_gro_pull(skb, gh_len); 534 skb_gro_postpull_rcsum(skb, gh, gh_len); 535 type = gh->proto_type; 536 if (likely(type == htons(ETH_P_TEB))) 537 return call_gro_receive(eth_gro_receive, head, skb); 538 539 ptype = gro_find_receive_by_type(type); 540 if (!ptype) 541 goto out; 542 543 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 544 flush = 0; 545 546 out: 547 skb_gro_flush_final(skb, pp, flush); 548 549 return pp; 550 } 551 552 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 553 int nhoff) 554 { 555 struct genevehdr *gh; 556 struct packet_offload *ptype; 557 __be16 type; 558 int gh_len; 559 int err = -ENOSYS; 560 561 gh = (struct genevehdr *)(skb->data + nhoff); 562 gh_len = geneve_hlen(gh); 563 type = gh->proto_type; 564 565 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */ 566 if (likely(type == htons(ETH_P_TEB))) 567 return eth_gro_complete(skb, nhoff + gh_len); 568 569 ptype = gro_find_complete_by_type(type); 570 if (ptype) 571 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 572 573 skb_set_inner_mac_header(skb, nhoff + gh_len); 574 575 return err; 576 } 577 578 /* Create new listen socket if needed */ 579 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 580 bool ipv6, bool ipv6_rx_csum) 581 { 582 struct geneve_net *gn = net_generic(net, geneve_net_id); 583 struct geneve_sock *gs; 584 struct socket *sock; 585 struct udp_tunnel_sock_cfg tunnel_cfg; 586 int h; 587 588 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 589 if (!gs) 590 return ERR_PTR(-ENOMEM); 591 592 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 593 if (IS_ERR(sock)) { 594 kfree(gs); 595 return ERR_CAST(sock); 596 } 597 598 gs->sock = sock; 599 gs->refcnt = 1; 600 for (h = 0; h < VNI_HASH_SIZE; ++h) 601 INIT_HLIST_HEAD(&gs->vni_list[h]); 602 603 /* Initialize the geneve udp offloads structure */ 604 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 605 606 /* Mark socket as an encapsulation socket */ 607 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 608 tunnel_cfg.sk_user_data = gs; 609 tunnel_cfg.encap_type = 1; 610 tunnel_cfg.gro_receive = geneve_gro_receive; 611 tunnel_cfg.gro_complete = geneve_gro_complete; 612 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 613 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 614 tunnel_cfg.encap_destroy = NULL; 615 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 616 list_add(&gs->list, &gn->sock_list); 617 return gs; 618 } 619 620 static void __geneve_sock_release(struct geneve_sock *gs) 621 { 622 if (!gs || --gs->refcnt) 623 return; 624 625 list_del(&gs->list); 626 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 627 udp_tunnel_sock_release(gs->sock); 628 kfree_rcu(gs, rcu); 629 } 630 631 static void geneve_sock_release(struct geneve_dev *geneve) 632 { 633 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 634 #if IS_ENABLED(CONFIG_IPV6) 635 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 636 637 rcu_assign_pointer(geneve->sock6, NULL); 638 #endif 639 640 rcu_assign_pointer(geneve->sock4, NULL); 641 synchronize_net(); 642 643 __geneve_sock_release(gs4); 644 #if IS_ENABLED(CONFIG_IPV6) 645 __geneve_sock_release(gs6); 646 #endif 647 } 648 649 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 650 sa_family_t family, 651 __be16 dst_port) 652 { 653 struct geneve_sock *gs; 654 655 list_for_each_entry(gs, &gn->sock_list, list) { 656 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 657 geneve_get_sk_family(gs) == family) { 658 return gs; 659 } 660 } 661 return NULL; 662 } 663 664 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 665 { 666 struct net *net = geneve->net; 667 struct geneve_net *gn = net_generic(net, geneve_net_id); 668 struct geneve_dev_node *node; 669 struct geneve_sock *gs; 670 __u8 vni[3]; 671 __u32 hash; 672 673 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 674 if (gs) { 675 gs->refcnt++; 676 goto out; 677 } 678 679 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 680 geneve->cfg.use_udp6_rx_checksums); 681 if (IS_ERR(gs)) 682 return PTR_ERR(gs); 683 684 out: 685 gs->collect_md = geneve->cfg.collect_md; 686 #if IS_ENABLED(CONFIG_IPV6) 687 if (ipv6) { 688 rcu_assign_pointer(geneve->sock6, gs); 689 node = &geneve->hlist6; 690 } else 691 #endif 692 { 693 rcu_assign_pointer(geneve->sock4, gs); 694 node = &geneve->hlist4; 695 } 696 node->geneve = geneve; 697 698 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 699 hash = geneve_net_vni_hash(vni); 700 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 701 return 0; 702 } 703 704 static int geneve_open(struct net_device *dev) 705 { 706 struct geneve_dev *geneve = netdev_priv(dev); 707 bool metadata = geneve->cfg.collect_md; 708 bool ipv4, ipv6; 709 int ret = 0; 710 711 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 712 ipv4 = !ipv6 || metadata; 713 #if IS_ENABLED(CONFIG_IPV6) 714 if (ipv6) { 715 ret = geneve_sock_add(geneve, true); 716 if (ret < 0 && ret != -EAFNOSUPPORT) 717 ipv4 = false; 718 } 719 #endif 720 if (ipv4) 721 ret = geneve_sock_add(geneve, false); 722 if (ret < 0) 723 geneve_sock_release(geneve); 724 725 return ret; 726 } 727 728 static int geneve_stop(struct net_device *dev) 729 { 730 struct geneve_dev *geneve = netdev_priv(dev); 731 732 hlist_del_init_rcu(&geneve->hlist4.hlist); 733 #if IS_ENABLED(CONFIG_IPV6) 734 hlist_del_init_rcu(&geneve->hlist6.hlist); 735 #endif 736 geneve_sock_release(geneve); 737 return 0; 738 } 739 740 static void geneve_build_header(struct genevehdr *geneveh, 741 const struct ip_tunnel_info *info, 742 __be16 inner_proto) 743 { 744 geneveh->ver = GENEVE_VER; 745 geneveh->opt_len = info->options_len / 4; 746 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 747 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 748 geneveh->rsvd1 = 0; 749 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 750 geneveh->proto_type = inner_proto; 751 geneveh->rsvd2 = 0; 752 753 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 754 ip_tunnel_info_opts_get(geneveh->options, info); 755 } 756 757 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 758 const struct ip_tunnel_info *info, 759 bool xnet, int ip_hdr_len, 760 bool inner_proto_inherit) 761 { 762 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 763 struct genevehdr *gnvh; 764 __be16 inner_proto; 765 int min_headroom; 766 int err; 767 768 skb_reset_mac_header(skb); 769 skb_scrub_packet(skb, xnet); 770 771 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 772 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 773 err = skb_cow_head(skb, min_headroom); 774 if (unlikely(err)) 775 goto free_dst; 776 777 err = udp_tunnel_handle_offloads(skb, udp_sum); 778 if (err) 779 goto free_dst; 780 781 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 782 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB); 783 geneve_build_header(gnvh, info, inner_proto); 784 skb_set_inner_protocol(skb, inner_proto); 785 return 0; 786 787 free_dst: 788 dst_release(dst); 789 return err; 790 } 791 792 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 793 struct net_device *dev, 794 struct geneve_sock *gs4, 795 struct flowi4 *fl4, 796 const struct ip_tunnel_info *info, 797 __be16 dport, __be16 sport, 798 __u8 *full_tos) 799 { 800 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 801 struct geneve_dev *geneve = netdev_priv(dev); 802 struct dst_cache *dst_cache; 803 struct rtable *rt = NULL; 804 __u8 tos; 805 806 if (!gs4) 807 return ERR_PTR(-EIO); 808 809 memset(fl4, 0, sizeof(*fl4)); 810 fl4->flowi4_mark = skb->mark; 811 fl4->flowi4_proto = IPPROTO_UDP; 812 fl4->daddr = info->key.u.ipv4.dst; 813 fl4->saddr = info->key.u.ipv4.src; 814 fl4->fl4_dport = dport; 815 fl4->fl4_sport = sport; 816 fl4->flowi4_flags = info->key.flow_flags; 817 818 tos = info->key.tos; 819 if ((tos == 1) && !geneve->cfg.collect_md) { 820 tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 821 use_cache = false; 822 } 823 fl4->flowi4_tos = RT_TOS(tos); 824 if (full_tos) 825 *full_tos = tos; 826 827 dst_cache = (struct dst_cache *)&info->dst_cache; 828 if (use_cache) { 829 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 830 if (rt) 831 return rt; 832 } 833 rt = ip_route_output_key(geneve->net, fl4); 834 if (IS_ERR(rt)) { 835 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 836 return ERR_PTR(-ENETUNREACH); 837 } 838 if (rt->dst.dev == dev) { /* is this necessary? */ 839 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 840 ip_rt_put(rt); 841 return ERR_PTR(-ELOOP); 842 } 843 if (use_cache) 844 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 845 return rt; 846 } 847 848 #if IS_ENABLED(CONFIG_IPV6) 849 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 850 struct net_device *dev, 851 struct geneve_sock *gs6, 852 struct flowi6 *fl6, 853 const struct ip_tunnel_info *info, 854 __be16 dport, __be16 sport) 855 { 856 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 857 struct geneve_dev *geneve = netdev_priv(dev); 858 struct dst_entry *dst = NULL; 859 struct dst_cache *dst_cache; 860 __u8 prio; 861 862 if (!gs6) 863 return ERR_PTR(-EIO); 864 865 memset(fl6, 0, sizeof(*fl6)); 866 fl6->flowi6_mark = skb->mark; 867 fl6->flowi6_proto = IPPROTO_UDP; 868 fl6->daddr = info->key.u.ipv6.dst; 869 fl6->saddr = info->key.u.ipv6.src; 870 fl6->fl6_dport = dport; 871 fl6->fl6_sport = sport; 872 873 prio = info->key.tos; 874 if ((prio == 1) && !geneve->cfg.collect_md) { 875 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 876 use_cache = false; 877 } 878 879 fl6->flowlabel = ip6_make_flowinfo(prio, info->key.label); 880 dst_cache = (struct dst_cache *)&info->dst_cache; 881 if (use_cache) { 882 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 883 if (dst) 884 return dst; 885 } 886 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, 887 NULL); 888 if (IS_ERR(dst)) { 889 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 890 return ERR_PTR(-ENETUNREACH); 891 } 892 if (dst->dev == dev) { /* is this necessary? */ 893 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 894 dst_release(dst); 895 return ERR_PTR(-ELOOP); 896 } 897 898 if (use_cache) 899 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 900 return dst; 901 } 902 #endif 903 904 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 905 struct geneve_dev *geneve, 906 const struct ip_tunnel_info *info) 907 { 908 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 909 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 910 const struct ip_tunnel_key *key = &info->key; 911 struct rtable *rt; 912 struct flowi4 fl4; 913 __u8 full_tos; 914 __u8 tos, ttl; 915 __be16 df = 0; 916 __be16 sport; 917 int err; 918 919 if (!pskb_inet_may_pull(skb)) 920 return -EINVAL; 921 922 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 923 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 924 geneve->cfg.info.key.tp_dst, sport, &full_tos); 925 if (IS_ERR(rt)) 926 return PTR_ERR(rt); 927 928 err = skb_tunnel_check_pmtu(skb, &rt->dst, 929 GENEVE_IPV4_HLEN + info->options_len, 930 netif_is_any_bridge_port(dev)); 931 if (err < 0) { 932 dst_release(&rt->dst); 933 return err; 934 } else if (err) { 935 struct ip_tunnel_info *info; 936 937 info = skb_tunnel_info(skb); 938 if (info) { 939 struct ip_tunnel_info *unclone; 940 941 unclone = skb_tunnel_info_unclone(skb); 942 if (unlikely(!unclone)) { 943 dst_release(&rt->dst); 944 return -ENOMEM; 945 } 946 947 unclone->key.u.ipv4.dst = fl4.saddr; 948 unclone->key.u.ipv4.src = fl4.daddr; 949 } 950 951 if (!pskb_may_pull(skb, ETH_HLEN)) { 952 dst_release(&rt->dst); 953 return -EINVAL; 954 } 955 956 skb->protocol = eth_type_trans(skb, geneve->dev); 957 __netif_rx(skb); 958 dst_release(&rt->dst); 959 return -EMSGSIZE; 960 } 961 962 if (geneve->cfg.collect_md) { 963 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 964 ttl = key->ttl; 965 966 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 967 } else { 968 tos = ip_tunnel_ecn_encap(full_tos, ip_hdr(skb), skb); 969 if (geneve->cfg.ttl_inherit) 970 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 971 else 972 ttl = key->ttl; 973 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 974 975 if (geneve->cfg.df == GENEVE_DF_SET) { 976 df = htons(IP_DF); 977 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 978 struct ethhdr *eth = eth_hdr(skb); 979 980 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 981 df = htons(IP_DF); 982 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 983 struct iphdr *iph = ip_hdr(skb); 984 985 if (iph->frag_off & htons(IP_DF)) 986 df = htons(IP_DF); 987 } 988 } 989 } 990 991 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr), 992 geneve->cfg.inner_proto_inherit); 993 if (unlikely(err)) 994 return err; 995 996 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 997 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 998 !net_eq(geneve->net, dev_net(geneve->dev)), 999 !(info->key.tun_flags & TUNNEL_CSUM)); 1000 return 0; 1001 } 1002 1003 #if IS_ENABLED(CONFIG_IPV6) 1004 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 1005 struct geneve_dev *geneve, 1006 const struct ip_tunnel_info *info) 1007 { 1008 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 1009 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1010 const struct ip_tunnel_key *key = &info->key; 1011 struct dst_entry *dst = NULL; 1012 struct flowi6 fl6; 1013 __u8 prio, ttl; 1014 __be16 sport; 1015 int err; 1016 1017 if (!pskb_inet_may_pull(skb)) 1018 return -EINVAL; 1019 1020 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 1021 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1022 geneve->cfg.info.key.tp_dst, sport); 1023 if (IS_ERR(dst)) 1024 return PTR_ERR(dst); 1025 1026 err = skb_tunnel_check_pmtu(skb, dst, 1027 GENEVE_IPV6_HLEN + info->options_len, 1028 netif_is_any_bridge_port(dev)); 1029 if (err < 0) { 1030 dst_release(dst); 1031 return err; 1032 } else if (err) { 1033 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1034 1035 if (info) { 1036 struct ip_tunnel_info *unclone; 1037 1038 unclone = skb_tunnel_info_unclone(skb); 1039 if (unlikely(!unclone)) { 1040 dst_release(dst); 1041 return -ENOMEM; 1042 } 1043 1044 unclone->key.u.ipv6.dst = fl6.saddr; 1045 unclone->key.u.ipv6.src = fl6.daddr; 1046 } 1047 1048 if (!pskb_may_pull(skb, ETH_HLEN)) { 1049 dst_release(dst); 1050 return -EINVAL; 1051 } 1052 1053 skb->protocol = eth_type_trans(skb, geneve->dev); 1054 __netif_rx(skb); 1055 dst_release(dst); 1056 return -EMSGSIZE; 1057 } 1058 1059 if (geneve->cfg.collect_md) { 1060 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 1061 ttl = key->ttl; 1062 } else { 1063 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1064 ip_hdr(skb), skb); 1065 if (geneve->cfg.ttl_inherit) 1066 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1067 else 1068 ttl = key->ttl; 1069 ttl = ttl ? : ip6_dst_hoplimit(dst); 1070 } 1071 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr), 1072 geneve->cfg.inner_proto_inherit); 1073 if (unlikely(err)) 1074 return err; 1075 1076 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1077 &fl6.saddr, &fl6.daddr, prio, ttl, 1078 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1079 !(info->key.tun_flags & TUNNEL_CSUM)); 1080 return 0; 1081 } 1082 #endif 1083 1084 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1085 { 1086 struct geneve_dev *geneve = netdev_priv(dev); 1087 struct ip_tunnel_info *info = NULL; 1088 int err; 1089 1090 if (geneve->cfg.collect_md) { 1091 info = skb_tunnel_info(skb); 1092 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1093 netdev_dbg(dev, "no tunnel metadata\n"); 1094 dev_kfree_skb(skb); 1095 dev->stats.tx_dropped++; 1096 return NETDEV_TX_OK; 1097 } 1098 } else { 1099 info = &geneve->cfg.info; 1100 } 1101 1102 rcu_read_lock(); 1103 #if IS_ENABLED(CONFIG_IPV6) 1104 if (info->mode & IP_TUNNEL_INFO_IPV6) 1105 err = geneve6_xmit_skb(skb, dev, geneve, info); 1106 else 1107 #endif 1108 err = geneve_xmit_skb(skb, dev, geneve, info); 1109 rcu_read_unlock(); 1110 1111 if (likely(!err)) 1112 return NETDEV_TX_OK; 1113 1114 if (err != -EMSGSIZE) 1115 dev_kfree_skb(skb); 1116 1117 if (err == -ELOOP) 1118 dev->stats.collisions++; 1119 else if (err == -ENETUNREACH) 1120 dev->stats.tx_carrier_errors++; 1121 1122 dev->stats.tx_errors++; 1123 return NETDEV_TX_OK; 1124 } 1125 1126 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1127 { 1128 if (new_mtu > dev->max_mtu) 1129 new_mtu = dev->max_mtu; 1130 else if (new_mtu < dev->min_mtu) 1131 new_mtu = dev->min_mtu; 1132 1133 dev->mtu = new_mtu; 1134 return 0; 1135 } 1136 1137 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1138 { 1139 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1140 struct geneve_dev *geneve = netdev_priv(dev); 1141 __be16 sport; 1142 1143 if (ip_tunnel_info_af(info) == AF_INET) { 1144 struct rtable *rt; 1145 struct flowi4 fl4; 1146 1147 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1148 sport = udp_flow_src_port(geneve->net, skb, 1149 1, USHRT_MAX, true); 1150 1151 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 1152 geneve->cfg.info.key.tp_dst, sport, NULL); 1153 if (IS_ERR(rt)) 1154 return PTR_ERR(rt); 1155 1156 ip_rt_put(rt); 1157 info->key.u.ipv4.src = fl4.saddr; 1158 #if IS_ENABLED(CONFIG_IPV6) 1159 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1160 struct dst_entry *dst; 1161 struct flowi6 fl6; 1162 1163 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1164 sport = udp_flow_src_port(geneve->net, skb, 1165 1, USHRT_MAX, true); 1166 1167 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1168 geneve->cfg.info.key.tp_dst, sport); 1169 if (IS_ERR(dst)) 1170 return PTR_ERR(dst); 1171 1172 dst_release(dst); 1173 info->key.u.ipv6.src = fl6.saddr; 1174 #endif 1175 } else { 1176 return -EINVAL; 1177 } 1178 1179 info->key.tp_src = sport; 1180 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1181 return 0; 1182 } 1183 1184 static const struct net_device_ops geneve_netdev_ops = { 1185 .ndo_init = geneve_init, 1186 .ndo_uninit = geneve_uninit, 1187 .ndo_open = geneve_open, 1188 .ndo_stop = geneve_stop, 1189 .ndo_start_xmit = geneve_xmit, 1190 .ndo_get_stats64 = dev_get_tstats64, 1191 .ndo_change_mtu = geneve_change_mtu, 1192 .ndo_validate_addr = eth_validate_addr, 1193 .ndo_set_mac_address = eth_mac_addr, 1194 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1195 }; 1196 1197 static void geneve_get_drvinfo(struct net_device *dev, 1198 struct ethtool_drvinfo *drvinfo) 1199 { 1200 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1201 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1202 } 1203 1204 static const struct ethtool_ops geneve_ethtool_ops = { 1205 .get_drvinfo = geneve_get_drvinfo, 1206 .get_link = ethtool_op_get_link, 1207 }; 1208 1209 /* Info for udev, that this is a virtual tunnel endpoint */ 1210 static struct device_type geneve_type = { 1211 .name = "geneve", 1212 }; 1213 1214 /* Calls the ndo_udp_tunnel_add of the caller in order to 1215 * supply the listening GENEVE udp ports. Callers are expected 1216 * to implement the ndo_udp_tunnel_add. 1217 */ 1218 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1219 { 1220 struct net *net = dev_net(dev); 1221 struct geneve_net *gn = net_generic(net, geneve_net_id); 1222 struct geneve_sock *gs; 1223 1224 rcu_read_lock(); 1225 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1226 if (push) { 1227 udp_tunnel_push_rx_port(dev, gs->sock, 1228 UDP_TUNNEL_TYPE_GENEVE); 1229 } else { 1230 udp_tunnel_drop_rx_port(dev, gs->sock, 1231 UDP_TUNNEL_TYPE_GENEVE); 1232 } 1233 } 1234 rcu_read_unlock(); 1235 } 1236 1237 /* Initialize the device structure. */ 1238 static void geneve_setup(struct net_device *dev) 1239 { 1240 ether_setup(dev); 1241 1242 dev->netdev_ops = &geneve_netdev_ops; 1243 dev->ethtool_ops = &geneve_ethtool_ops; 1244 dev->needs_free_netdev = true; 1245 1246 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1247 1248 dev->features |= NETIF_F_LLTX; 1249 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1250 dev->features |= NETIF_F_RXCSUM; 1251 dev->features |= NETIF_F_GSO_SOFTWARE; 1252 1253 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1254 dev->hw_features |= NETIF_F_RXCSUM; 1255 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1256 1257 /* MTU range: 68 - (something less than 65535) */ 1258 dev->min_mtu = ETH_MIN_MTU; 1259 /* The max_mtu calculation does not take account of GENEVE 1260 * options, to avoid excluding potentially valid 1261 * configurations. This will be further reduced by IPvX hdr size. 1262 */ 1263 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1264 1265 netif_keep_dst(dev); 1266 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1267 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1268 eth_hw_addr_random(dev); 1269 } 1270 1271 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1272 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, 1273 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1274 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1275 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1276 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1277 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1278 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1279 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1280 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1281 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1282 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1283 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1284 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1285 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1286 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, 1287 }; 1288 1289 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1290 struct netlink_ext_ack *extack) 1291 { 1292 if (tb[IFLA_ADDRESS]) { 1293 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1294 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1295 "Provided link layer address is not Ethernet"); 1296 return -EINVAL; 1297 } 1298 1299 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1300 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1301 "Provided Ethernet address is not unicast"); 1302 return -EADDRNOTAVAIL; 1303 } 1304 } 1305 1306 if (!data) { 1307 NL_SET_ERR_MSG(extack, 1308 "Not enough attributes provided to perform the operation"); 1309 return -EINVAL; 1310 } 1311 1312 if (data[IFLA_GENEVE_ID]) { 1313 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1314 1315 if (vni >= GENEVE_N_VID) { 1316 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1317 "Geneve ID must be lower than 16777216"); 1318 return -ERANGE; 1319 } 1320 } 1321 1322 if (data[IFLA_GENEVE_DF]) { 1323 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1324 1325 if (df < 0 || df > GENEVE_DF_MAX) { 1326 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1327 "Invalid DF attribute"); 1328 return -EINVAL; 1329 } 1330 } 1331 1332 return 0; 1333 } 1334 1335 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1336 const struct ip_tunnel_info *info, 1337 bool *tun_on_same_port, 1338 bool *tun_collect_md) 1339 { 1340 struct geneve_dev *geneve, *t = NULL; 1341 1342 *tun_on_same_port = false; 1343 *tun_collect_md = false; 1344 list_for_each_entry(geneve, &gn->geneve_list, next) { 1345 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1346 *tun_collect_md = geneve->cfg.collect_md; 1347 *tun_on_same_port = true; 1348 } 1349 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1350 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1351 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1352 t = geneve; 1353 } 1354 return t; 1355 } 1356 1357 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1358 { 1359 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1360 info->key.ttl || info->key.label || info->key.tp_src || 1361 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1362 } 1363 1364 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1365 struct ip_tunnel_info *b) 1366 { 1367 if (ip_tunnel_info_af(a) == AF_INET) 1368 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1369 else 1370 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1371 } 1372 1373 static int geneve_configure(struct net *net, struct net_device *dev, 1374 struct netlink_ext_ack *extack, 1375 const struct geneve_config *cfg) 1376 { 1377 struct geneve_net *gn = net_generic(net, geneve_net_id); 1378 struct geneve_dev *t, *geneve = netdev_priv(dev); 1379 const struct ip_tunnel_info *info = &cfg->info; 1380 bool tun_collect_md, tun_on_same_port; 1381 int err, encap_len; 1382 1383 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1384 NL_SET_ERR_MSG(extack, 1385 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1386 return -EINVAL; 1387 } 1388 1389 geneve->net = net; 1390 geneve->dev = dev; 1391 1392 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1393 if (t) 1394 return -EBUSY; 1395 1396 /* make enough headroom for basic scenario */ 1397 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1398 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1399 encap_len += sizeof(struct iphdr); 1400 dev->max_mtu -= sizeof(struct iphdr); 1401 } else { 1402 encap_len += sizeof(struct ipv6hdr); 1403 dev->max_mtu -= sizeof(struct ipv6hdr); 1404 } 1405 dev->needed_headroom = encap_len + ETH_HLEN; 1406 1407 if (cfg->collect_md) { 1408 if (tun_on_same_port) { 1409 NL_SET_ERR_MSG(extack, 1410 "There can be only one externally controlled device on a destination port"); 1411 return -EPERM; 1412 } 1413 } else { 1414 if (tun_collect_md) { 1415 NL_SET_ERR_MSG(extack, 1416 "There already exists an externally controlled device on this destination port"); 1417 return -EPERM; 1418 } 1419 } 1420 1421 dst_cache_reset(&geneve->cfg.info.dst_cache); 1422 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1423 1424 if (geneve->cfg.inner_proto_inherit) { 1425 dev->header_ops = NULL; 1426 dev->type = ARPHRD_NONE; 1427 dev->hard_header_len = 0; 1428 dev->addr_len = 0; 1429 dev->flags = IFF_NOARP; 1430 } 1431 1432 err = register_netdevice(dev); 1433 if (err) 1434 return err; 1435 1436 list_add(&geneve->next, &gn->geneve_list); 1437 return 0; 1438 } 1439 1440 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1441 { 1442 memset(info, 0, sizeof(*info)); 1443 info->key.tp_dst = htons(dst_port); 1444 } 1445 1446 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1447 struct netlink_ext_ack *extack, 1448 struct geneve_config *cfg, bool changelink) 1449 { 1450 struct ip_tunnel_info *info = &cfg->info; 1451 int attrtype; 1452 1453 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1454 NL_SET_ERR_MSG(extack, 1455 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1456 return -EINVAL; 1457 } 1458 1459 if (data[IFLA_GENEVE_REMOTE]) { 1460 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1461 attrtype = IFLA_GENEVE_REMOTE; 1462 goto change_notsup; 1463 } 1464 1465 info->key.u.ipv4.dst = 1466 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1467 1468 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1469 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1470 "Remote IPv4 address cannot be Multicast"); 1471 return -EINVAL; 1472 } 1473 } 1474 1475 if (data[IFLA_GENEVE_REMOTE6]) { 1476 #if IS_ENABLED(CONFIG_IPV6) 1477 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1478 attrtype = IFLA_GENEVE_REMOTE6; 1479 goto change_notsup; 1480 } 1481 1482 info->mode = IP_TUNNEL_INFO_IPV6; 1483 info->key.u.ipv6.dst = 1484 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1485 1486 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1487 IPV6_ADDR_LINKLOCAL) { 1488 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1489 "Remote IPv6 address cannot be link-local"); 1490 return -EINVAL; 1491 } 1492 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1493 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1494 "Remote IPv6 address cannot be Multicast"); 1495 return -EINVAL; 1496 } 1497 info->key.tun_flags |= TUNNEL_CSUM; 1498 cfg->use_udp6_rx_checksums = true; 1499 #else 1500 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1501 "IPv6 support not enabled in the kernel"); 1502 return -EPFNOSUPPORT; 1503 #endif 1504 } 1505 1506 if (data[IFLA_GENEVE_ID]) { 1507 __u32 vni; 1508 __u8 tvni[3]; 1509 __be64 tunid; 1510 1511 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1512 tvni[0] = (vni & 0x00ff0000) >> 16; 1513 tvni[1] = (vni & 0x0000ff00) >> 8; 1514 tvni[2] = vni & 0x000000ff; 1515 1516 tunid = vni_to_tunnel_id(tvni); 1517 if (changelink && (tunid != info->key.tun_id)) { 1518 attrtype = IFLA_GENEVE_ID; 1519 goto change_notsup; 1520 } 1521 info->key.tun_id = tunid; 1522 } 1523 1524 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1525 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1526 cfg->ttl_inherit = true; 1527 else 1528 cfg->ttl_inherit = false; 1529 } else if (data[IFLA_GENEVE_TTL]) { 1530 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1531 cfg->ttl_inherit = false; 1532 } 1533 1534 if (data[IFLA_GENEVE_TOS]) 1535 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1536 1537 if (data[IFLA_GENEVE_DF]) 1538 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1539 1540 if (data[IFLA_GENEVE_LABEL]) { 1541 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1542 IPV6_FLOWLABEL_MASK; 1543 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1544 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1545 "Label attribute only applies for IPv6 Geneve devices"); 1546 return -EINVAL; 1547 } 1548 } 1549 1550 if (data[IFLA_GENEVE_PORT]) { 1551 if (changelink) { 1552 attrtype = IFLA_GENEVE_PORT; 1553 goto change_notsup; 1554 } 1555 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1556 } 1557 1558 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1559 if (changelink) { 1560 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1561 goto change_notsup; 1562 } 1563 cfg->collect_md = true; 1564 } 1565 1566 if (data[IFLA_GENEVE_UDP_CSUM]) { 1567 if (changelink) { 1568 attrtype = IFLA_GENEVE_UDP_CSUM; 1569 goto change_notsup; 1570 } 1571 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1572 info->key.tun_flags |= TUNNEL_CSUM; 1573 } 1574 1575 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1576 #if IS_ENABLED(CONFIG_IPV6) 1577 if (changelink) { 1578 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1579 goto change_notsup; 1580 } 1581 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1582 info->key.tun_flags &= ~TUNNEL_CSUM; 1583 #else 1584 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1585 "IPv6 support not enabled in the kernel"); 1586 return -EPFNOSUPPORT; 1587 #endif 1588 } 1589 1590 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1591 #if IS_ENABLED(CONFIG_IPV6) 1592 if (changelink) { 1593 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1594 goto change_notsup; 1595 } 1596 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1597 cfg->use_udp6_rx_checksums = false; 1598 #else 1599 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1600 "IPv6 support not enabled in the kernel"); 1601 return -EPFNOSUPPORT; 1602 #endif 1603 } 1604 1605 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { 1606 if (changelink) { 1607 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; 1608 goto change_notsup; 1609 } 1610 cfg->inner_proto_inherit = true; 1611 } 1612 1613 return 0; 1614 change_notsup: 1615 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1616 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported"); 1617 return -EOPNOTSUPP; 1618 } 1619 1620 static void geneve_link_config(struct net_device *dev, 1621 struct ip_tunnel_info *info, struct nlattr *tb[]) 1622 { 1623 struct geneve_dev *geneve = netdev_priv(dev); 1624 int ldev_mtu = 0; 1625 1626 if (tb[IFLA_MTU]) { 1627 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1628 return; 1629 } 1630 1631 switch (ip_tunnel_info_af(info)) { 1632 case AF_INET: { 1633 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1634 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1635 1636 if (!IS_ERR(rt) && rt->dst.dev) { 1637 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1638 ip_rt_put(rt); 1639 } 1640 break; 1641 } 1642 #if IS_ENABLED(CONFIG_IPV6) 1643 case AF_INET6: { 1644 struct rt6_info *rt; 1645 1646 if (!__in6_dev_get(dev)) 1647 break; 1648 1649 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1650 NULL, 0); 1651 1652 if (rt && rt->dst.dev) 1653 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1654 ip6_rt_put(rt); 1655 break; 1656 } 1657 #endif 1658 } 1659 1660 if (ldev_mtu <= 0) 1661 return; 1662 1663 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1664 } 1665 1666 static int geneve_newlink(struct net *net, struct net_device *dev, 1667 struct nlattr *tb[], struct nlattr *data[], 1668 struct netlink_ext_ack *extack) 1669 { 1670 struct geneve_config cfg = { 1671 .df = GENEVE_DF_UNSET, 1672 .use_udp6_rx_checksums = false, 1673 .ttl_inherit = false, 1674 .collect_md = false, 1675 }; 1676 int err; 1677 1678 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1679 err = geneve_nl2info(tb, data, extack, &cfg, false); 1680 if (err) 1681 return err; 1682 1683 err = geneve_configure(net, dev, extack, &cfg); 1684 if (err) 1685 return err; 1686 1687 geneve_link_config(dev, &cfg.info, tb); 1688 1689 return 0; 1690 } 1691 1692 /* Quiesces the geneve device data path for both TX and RX. 1693 * 1694 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1695 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1696 * to complete for the existing set of in-flight packets to be transmitted, 1697 * then we would have quiesced the transmit data path. All the future packets 1698 * will get dropped until we unquiesce the data path. 1699 * 1700 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1701 * if we set that to NULL under RCU and wait for synchronize_net() to 1702 * complete, then we would have quiesced the receive data path. 1703 */ 1704 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1705 struct geneve_sock **gs6) 1706 { 1707 *gs4 = rtnl_dereference(geneve->sock4); 1708 rcu_assign_pointer(geneve->sock4, NULL); 1709 if (*gs4) 1710 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1711 #if IS_ENABLED(CONFIG_IPV6) 1712 *gs6 = rtnl_dereference(geneve->sock6); 1713 rcu_assign_pointer(geneve->sock6, NULL); 1714 if (*gs6) 1715 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1716 #else 1717 *gs6 = NULL; 1718 #endif 1719 synchronize_net(); 1720 } 1721 1722 /* Resumes the geneve device data path for both TX and RX. */ 1723 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1724 struct geneve_sock __maybe_unused *gs6) 1725 { 1726 rcu_assign_pointer(geneve->sock4, gs4); 1727 if (gs4) 1728 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1729 #if IS_ENABLED(CONFIG_IPV6) 1730 rcu_assign_pointer(geneve->sock6, gs6); 1731 if (gs6) 1732 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1733 #endif 1734 synchronize_net(); 1735 } 1736 1737 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1738 struct nlattr *data[], 1739 struct netlink_ext_ack *extack) 1740 { 1741 struct geneve_dev *geneve = netdev_priv(dev); 1742 struct geneve_sock *gs4, *gs6; 1743 struct geneve_config cfg; 1744 int err; 1745 1746 /* If the geneve device is configured for metadata (or externally 1747 * controlled, for example, OVS), then nothing can be changed. 1748 */ 1749 if (geneve->cfg.collect_md) 1750 return -EOPNOTSUPP; 1751 1752 /* Start with the existing info. */ 1753 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1754 err = geneve_nl2info(tb, data, extack, &cfg, true); 1755 if (err) 1756 return err; 1757 1758 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1759 dst_cache_reset(&cfg.info.dst_cache); 1760 geneve_link_config(dev, &cfg.info, tb); 1761 } 1762 1763 geneve_quiesce(geneve, &gs4, &gs6); 1764 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1765 geneve_unquiesce(geneve, gs4, gs6); 1766 1767 return 0; 1768 } 1769 1770 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1771 { 1772 struct geneve_dev *geneve = netdev_priv(dev); 1773 1774 list_del(&geneve->next); 1775 unregister_netdevice_queue(dev, head); 1776 } 1777 1778 static size_t geneve_get_size(const struct net_device *dev) 1779 { 1780 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1781 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1782 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1783 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1784 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1785 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1786 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1787 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1788 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1789 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1790 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1791 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1792 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ 1793 0; 1794 } 1795 1796 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1797 { 1798 struct geneve_dev *geneve = netdev_priv(dev); 1799 struct ip_tunnel_info *info = &geneve->cfg.info; 1800 bool ttl_inherit = geneve->cfg.ttl_inherit; 1801 bool metadata = geneve->cfg.collect_md; 1802 __u8 tmp_vni[3]; 1803 __u32 vni; 1804 1805 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1806 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1807 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1808 goto nla_put_failure; 1809 1810 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1811 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1812 info->key.u.ipv4.dst)) 1813 goto nla_put_failure; 1814 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1815 !!(info->key.tun_flags & TUNNEL_CSUM))) 1816 goto nla_put_failure; 1817 1818 #if IS_ENABLED(CONFIG_IPV6) 1819 } else if (!metadata) { 1820 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1821 &info->key.u.ipv6.dst)) 1822 goto nla_put_failure; 1823 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1824 !(info->key.tun_flags & TUNNEL_CSUM))) 1825 goto nla_put_failure; 1826 #endif 1827 } 1828 1829 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1830 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1831 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1832 goto nla_put_failure; 1833 1834 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1835 goto nla_put_failure; 1836 1837 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1838 goto nla_put_failure; 1839 1840 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1841 goto nla_put_failure; 1842 1843 #if IS_ENABLED(CONFIG_IPV6) 1844 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1845 !geneve->cfg.use_udp6_rx_checksums)) 1846 goto nla_put_failure; 1847 #endif 1848 1849 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1850 goto nla_put_failure; 1851 1852 if (geneve->cfg.inner_proto_inherit && 1853 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) 1854 goto nla_put_failure; 1855 1856 return 0; 1857 1858 nla_put_failure: 1859 return -EMSGSIZE; 1860 } 1861 1862 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1863 .kind = "geneve", 1864 .maxtype = IFLA_GENEVE_MAX, 1865 .policy = geneve_policy, 1866 .priv_size = sizeof(struct geneve_dev), 1867 .setup = geneve_setup, 1868 .validate = geneve_validate, 1869 .newlink = geneve_newlink, 1870 .changelink = geneve_changelink, 1871 .dellink = geneve_dellink, 1872 .get_size = geneve_get_size, 1873 .fill_info = geneve_fill_info, 1874 }; 1875 1876 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1877 u8 name_assign_type, u16 dst_port) 1878 { 1879 struct nlattr *tb[IFLA_MAX + 1]; 1880 struct net_device *dev; 1881 LIST_HEAD(list_kill); 1882 int err; 1883 struct geneve_config cfg = { 1884 .df = GENEVE_DF_UNSET, 1885 .use_udp6_rx_checksums = true, 1886 .ttl_inherit = false, 1887 .collect_md = true, 1888 }; 1889 1890 memset(tb, 0, sizeof(tb)); 1891 dev = rtnl_create_link(net, name, name_assign_type, 1892 &geneve_link_ops, tb, NULL); 1893 if (IS_ERR(dev)) 1894 return dev; 1895 1896 init_tnl_info(&cfg.info, dst_port); 1897 err = geneve_configure(net, dev, NULL, &cfg); 1898 if (err) { 1899 free_netdev(dev); 1900 return ERR_PTR(err); 1901 } 1902 1903 /* openvswitch users expect packet sizes to be unrestricted, 1904 * so set the largest MTU we can. 1905 */ 1906 err = geneve_change_mtu(dev, IP_MAX_MTU); 1907 if (err) 1908 goto err; 1909 1910 err = rtnl_configure_link(dev, NULL, 0, NULL); 1911 if (err < 0) 1912 goto err; 1913 1914 return dev; 1915 err: 1916 geneve_dellink(dev, &list_kill); 1917 unregister_netdevice_many(&list_kill); 1918 return ERR_PTR(err); 1919 } 1920 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1921 1922 static int geneve_netdevice_event(struct notifier_block *unused, 1923 unsigned long event, void *ptr) 1924 { 1925 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1926 1927 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1928 geneve_offload_rx_ports(dev, true); 1929 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 1930 geneve_offload_rx_ports(dev, false); 1931 1932 return NOTIFY_DONE; 1933 } 1934 1935 static struct notifier_block geneve_notifier_block __read_mostly = { 1936 .notifier_call = geneve_netdevice_event, 1937 }; 1938 1939 static __net_init int geneve_init_net(struct net *net) 1940 { 1941 struct geneve_net *gn = net_generic(net, geneve_net_id); 1942 1943 INIT_LIST_HEAD(&gn->geneve_list); 1944 INIT_LIST_HEAD(&gn->sock_list); 1945 return 0; 1946 } 1947 1948 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1949 { 1950 struct geneve_net *gn = net_generic(net, geneve_net_id); 1951 struct geneve_dev *geneve, *next; 1952 struct net_device *dev, *aux; 1953 1954 /* gather any geneve devices that were moved into this ns */ 1955 for_each_netdev_safe(net, dev, aux) 1956 if (dev->rtnl_link_ops == &geneve_link_ops) 1957 unregister_netdevice_queue(dev, head); 1958 1959 /* now gather any other geneve devices that were created in this ns */ 1960 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1961 /* If geneve->dev is in the same netns, it was already added 1962 * to the list by the previous loop. 1963 */ 1964 if (!net_eq(dev_net(geneve->dev), net)) 1965 unregister_netdevice_queue(geneve->dev, head); 1966 } 1967 } 1968 1969 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1970 { 1971 struct net *net; 1972 LIST_HEAD(list); 1973 1974 rtnl_lock(); 1975 list_for_each_entry(net, net_list, exit_list) 1976 geneve_destroy_tunnels(net, &list); 1977 1978 /* unregister the devices gathered above */ 1979 unregister_netdevice_many(&list); 1980 rtnl_unlock(); 1981 1982 list_for_each_entry(net, net_list, exit_list) { 1983 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1984 1985 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1986 } 1987 } 1988 1989 static struct pernet_operations geneve_net_ops = { 1990 .init = geneve_init_net, 1991 .exit_batch = geneve_exit_batch_net, 1992 .id = &geneve_net_id, 1993 .size = sizeof(struct geneve_net), 1994 }; 1995 1996 static int __init geneve_init_module(void) 1997 { 1998 int rc; 1999 2000 rc = register_pernet_subsys(&geneve_net_ops); 2001 if (rc) 2002 goto out1; 2003 2004 rc = register_netdevice_notifier(&geneve_notifier_block); 2005 if (rc) 2006 goto out2; 2007 2008 rc = rtnl_link_register(&geneve_link_ops); 2009 if (rc) 2010 goto out3; 2011 2012 return 0; 2013 out3: 2014 unregister_netdevice_notifier(&geneve_notifier_block); 2015 out2: 2016 unregister_pernet_subsys(&geneve_net_ops); 2017 out1: 2018 return rc; 2019 } 2020 late_initcall(geneve_init_module); 2021 2022 static void __exit geneve_cleanup_module(void) 2023 { 2024 rtnl_link_unregister(&geneve_link_ops); 2025 unregister_netdevice_notifier(&geneve_notifier_block); 2026 unregister_pernet_subsys(&geneve_net_ops); 2027 } 2028 module_exit(geneve_cleanup_module); 2029 2030 MODULE_LICENSE("GPL"); 2031 MODULE_VERSION(GENEVE_NETDEV_VER); 2032 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 2033 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 2034 MODULE_ALIAS_RTNL_LINK("geneve"); 2035