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 gs = rcu_dereference_sk_user_data(sk); 369 if (!gs) 370 goto drop; 371 372 geneve = geneve_lookup_skb(gs, skb); 373 if (!geneve) 374 goto drop; 375 376 inner_proto = geneveh->proto_type; 377 378 if (unlikely((!geneve->cfg.inner_proto_inherit && 379 inner_proto != htons(ETH_P_TEB)))) { 380 geneve->dev->stats.rx_dropped++; 381 goto drop; 382 } 383 384 opts_len = geneveh->opt_len * 4; 385 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto, 386 !net_eq(geneve->net, dev_net(geneve->dev)))) { 387 geneve->dev->stats.rx_dropped++; 388 goto drop; 389 } 390 391 geneve_rx(geneve, gs, skb); 392 return 0; 393 394 drop: 395 /* Consume bad packet */ 396 kfree_skb(skb); 397 return 0; 398 } 399 400 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 401 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 402 { 403 struct genevehdr *geneveh; 404 struct geneve_sock *gs; 405 u8 zero_vni[3] = { 0 }; 406 u8 *vni = zero_vni; 407 408 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 409 return -EINVAL; 410 411 geneveh = geneve_hdr(skb); 412 if (geneveh->ver != GENEVE_VER) 413 return -EINVAL; 414 415 if (geneveh->proto_type != htons(ETH_P_TEB)) 416 return -EINVAL; 417 418 gs = rcu_dereference_sk_user_data(sk); 419 if (!gs) 420 return -ENOENT; 421 422 if (geneve_get_sk_family(gs) == AF_INET) { 423 struct iphdr *iph = ip_hdr(skb); 424 __be32 addr4 = 0; 425 426 if (!gs->collect_md) { 427 vni = geneve_hdr(skb)->vni; 428 addr4 = iph->daddr; 429 } 430 431 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 432 } 433 434 #if IS_ENABLED(CONFIG_IPV6) 435 if (geneve_get_sk_family(gs) == AF_INET6) { 436 struct ipv6hdr *ip6h = ipv6_hdr(skb); 437 struct in6_addr addr6; 438 439 memset(&addr6, 0, sizeof(struct in6_addr)); 440 441 if (!gs->collect_md) { 442 vni = geneve_hdr(skb)->vni; 443 addr6 = ip6h->daddr; 444 } 445 446 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 447 } 448 #endif 449 450 return -EPFNOSUPPORT; 451 } 452 453 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 454 __be16 port, bool ipv6_rx_csum) 455 { 456 struct socket *sock; 457 struct udp_port_cfg udp_conf; 458 int err; 459 460 memset(&udp_conf, 0, sizeof(udp_conf)); 461 462 if (ipv6) { 463 udp_conf.family = AF_INET6; 464 udp_conf.ipv6_v6only = 1; 465 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 466 } else { 467 udp_conf.family = AF_INET; 468 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 469 } 470 471 udp_conf.local_udp_port = port; 472 473 /* Open UDP socket */ 474 err = udp_sock_create(net, &udp_conf, &sock); 475 if (err < 0) 476 return ERR_PTR(err); 477 478 udp_allow_gso(sock->sk); 479 return sock; 480 } 481 482 static int geneve_hlen(struct genevehdr *gh) 483 { 484 return sizeof(*gh) + gh->opt_len * 4; 485 } 486 487 static struct sk_buff *geneve_gro_receive(struct sock *sk, 488 struct list_head *head, 489 struct sk_buff *skb) 490 { 491 struct sk_buff *pp = NULL; 492 struct sk_buff *p; 493 struct genevehdr *gh, *gh2; 494 unsigned int hlen, gh_len, off_gnv; 495 const struct packet_offload *ptype; 496 __be16 type; 497 int flush = 1; 498 499 off_gnv = skb_gro_offset(skb); 500 hlen = off_gnv + sizeof(*gh); 501 gh = skb_gro_header(skb, hlen, off_gnv); 502 if (unlikely(!gh)) 503 goto out; 504 505 if (gh->ver != GENEVE_VER || gh->oam) 506 goto out; 507 gh_len = geneve_hlen(gh); 508 509 hlen = off_gnv + gh_len; 510 if (skb_gro_header_hard(skb, hlen)) { 511 gh = skb_gro_header_slow(skb, hlen, off_gnv); 512 if (unlikely(!gh)) 513 goto out; 514 } 515 516 list_for_each_entry(p, head, list) { 517 if (!NAPI_GRO_CB(p)->same_flow) 518 continue; 519 520 gh2 = (struct genevehdr *)(p->data + off_gnv); 521 if (gh->opt_len != gh2->opt_len || 522 memcmp(gh, gh2, gh_len)) { 523 NAPI_GRO_CB(p)->same_flow = 0; 524 continue; 525 } 526 } 527 528 skb_gro_pull(skb, gh_len); 529 skb_gro_postpull_rcsum(skb, gh, gh_len); 530 type = gh->proto_type; 531 if (likely(type == htons(ETH_P_TEB))) 532 return call_gro_receive(eth_gro_receive, head, skb); 533 534 ptype = gro_find_receive_by_type(type); 535 if (!ptype) 536 goto out; 537 538 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 539 flush = 0; 540 541 out: 542 skb_gro_flush_final(skb, pp, flush); 543 544 return pp; 545 } 546 547 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 548 int nhoff) 549 { 550 struct genevehdr *gh; 551 struct packet_offload *ptype; 552 __be16 type; 553 int gh_len; 554 int err = -ENOSYS; 555 556 gh = (struct genevehdr *)(skb->data + nhoff); 557 gh_len = geneve_hlen(gh); 558 type = gh->proto_type; 559 560 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */ 561 if (likely(type == htons(ETH_P_TEB))) 562 return eth_gro_complete(skb, nhoff + gh_len); 563 564 ptype = gro_find_complete_by_type(type); 565 if (ptype) 566 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 567 568 skb_set_inner_mac_header(skb, nhoff + gh_len); 569 570 return err; 571 } 572 573 /* Create new listen socket if needed */ 574 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 575 bool ipv6, bool ipv6_rx_csum) 576 { 577 struct geneve_net *gn = net_generic(net, geneve_net_id); 578 struct geneve_sock *gs; 579 struct socket *sock; 580 struct udp_tunnel_sock_cfg tunnel_cfg; 581 int h; 582 583 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 584 if (!gs) 585 return ERR_PTR(-ENOMEM); 586 587 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 588 if (IS_ERR(sock)) { 589 kfree(gs); 590 return ERR_CAST(sock); 591 } 592 593 gs->sock = sock; 594 gs->refcnt = 1; 595 for (h = 0; h < VNI_HASH_SIZE; ++h) 596 INIT_HLIST_HEAD(&gs->vni_list[h]); 597 598 /* Initialize the geneve udp offloads structure */ 599 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 600 601 /* Mark socket as an encapsulation socket */ 602 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 603 tunnel_cfg.sk_user_data = gs; 604 tunnel_cfg.encap_type = 1; 605 tunnel_cfg.gro_receive = geneve_gro_receive; 606 tunnel_cfg.gro_complete = geneve_gro_complete; 607 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 608 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 609 tunnel_cfg.encap_destroy = NULL; 610 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 611 list_add(&gs->list, &gn->sock_list); 612 return gs; 613 } 614 615 static void __geneve_sock_release(struct geneve_sock *gs) 616 { 617 if (!gs || --gs->refcnt) 618 return; 619 620 list_del(&gs->list); 621 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 622 udp_tunnel_sock_release(gs->sock); 623 kfree_rcu(gs, rcu); 624 } 625 626 static void geneve_sock_release(struct geneve_dev *geneve) 627 { 628 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 629 #if IS_ENABLED(CONFIG_IPV6) 630 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 631 632 rcu_assign_pointer(geneve->sock6, NULL); 633 #endif 634 635 rcu_assign_pointer(geneve->sock4, NULL); 636 synchronize_net(); 637 638 __geneve_sock_release(gs4); 639 #if IS_ENABLED(CONFIG_IPV6) 640 __geneve_sock_release(gs6); 641 #endif 642 } 643 644 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 645 sa_family_t family, 646 __be16 dst_port) 647 { 648 struct geneve_sock *gs; 649 650 list_for_each_entry(gs, &gn->sock_list, list) { 651 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 652 geneve_get_sk_family(gs) == family) { 653 return gs; 654 } 655 } 656 return NULL; 657 } 658 659 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 660 { 661 struct net *net = geneve->net; 662 struct geneve_net *gn = net_generic(net, geneve_net_id); 663 struct geneve_dev_node *node; 664 struct geneve_sock *gs; 665 __u8 vni[3]; 666 __u32 hash; 667 668 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 669 if (gs) { 670 gs->refcnt++; 671 goto out; 672 } 673 674 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 675 geneve->cfg.use_udp6_rx_checksums); 676 if (IS_ERR(gs)) 677 return PTR_ERR(gs); 678 679 out: 680 gs->collect_md = geneve->cfg.collect_md; 681 #if IS_ENABLED(CONFIG_IPV6) 682 if (ipv6) { 683 rcu_assign_pointer(geneve->sock6, gs); 684 node = &geneve->hlist6; 685 } else 686 #endif 687 { 688 rcu_assign_pointer(geneve->sock4, gs); 689 node = &geneve->hlist4; 690 } 691 node->geneve = geneve; 692 693 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 694 hash = geneve_net_vni_hash(vni); 695 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 696 return 0; 697 } 698 699 static int geneve_open(struct net_device *dev) 700 { 701 struct geneve_dev *geneve = netdev_priv(dev); 702 bool metadata = geneve->cfg.collect_md; 703 bool ipv4, ipv6; 704 int ret = 0; 705 706 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 707 ipv4 = !ipv6 || metadata; 708 #if IS_ENABLED(CONFIG_IPV6) 709 if (ipv6) { 710 ret = geneve_sock_add(geneve, true); 711 if (ret < 0 && ret != -EAFNOSUPPORT) 712 ipv4 = false; 713 } 714 #endif 715 if (ipv4) 716 ret = geneve_sock_add(geneve, false); 717 if (ret < 0) 718 geneve_sock_release(geneve); 719 720 return ret; 721 } 722 723 static int geneve_stop(struct net_device *dev) 724 { 725 struct geneve_dev *geneve = netdev_priv(dev); 726 727 hlist_del_init_rcu(&geneve->hlist4.hlist); 728 #if IS_ENABLED(CONFIG_IPV6) 729 hlist_del_init_rcu(&geneve->hlist6.hlist); 730 #endif 731 geneve_sock_release(geneve); 732 return 0; 733 } 734 735 static void geneve_build_header(struct genevehdr *geneveh, 736 const struct ip_tunnel_info *info, 737 __be16 inner_proto) 738 { 739 geneveh->ver = GENEVE_VER; 740 geneveh->opt_len = info->options_len / 4; 741 geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); 742 geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); 743 geneveh->rsvd1 = 0; 744 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 745 geneveh->proto_type = inner_proto; 746 geneveh->rsvd2 = 0; 747 748 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) 749 ip_tunnel_info_opts_get(geneveh->options, info); 750 } 751 752 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 753 const struct ip_tunnel_info *info, 754 bool xnet, int ip_hdr_len, 755 bool inner_proto_inherit) 756 { 757 bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); 758 struct genevehdr *gnvh; 759 __be16 inner_proto; 760 int min_headroom; 761 int err; 762 763 skb_reset_mac_header(skb); 764 skb_scrub_packet(skb, xnet); 765 766 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 767 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 768 err = skb_cow_head(skb, min_headroom); 769 if (unlikely(err)) 770 goto free_dst; 771 772 err = udp_tunnel_handle_offloads(skb, udp_sum); 773 if (err) 774 goto free_dst; 775 776 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 777 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB); 778 geneve_build_header(gnvh, info, inner_proto); 779 skb_set_inner_protocol(skb, inner_proto); 780 return 0; 781 782 free_dst: 783 dst_release(dst); 784 return err; 785 } 786 787 static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, 788 struct net_device *dev, 789 struct geneve_sock *gs4, 790 struct flowi4 *fl4, 791 const struct ip_tunnel_info *info, 792 __be16 dport, __be16 sport, 793 __u8 *full_tos) 794 { 795 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 796 struct geneve_dev *geneve = netdev_priv(dev); 797 struct dst_cache *dst_cache; 798 struct rtable *rt = NULL; 799 __u8 tos; 800 801 if (!gs4) 802 return ERR_PTR(-EIO); 803 804 memset(fl4, 0, sizeof(*fl4)); 805 fl4->flowi4_mark = skb->mark; 806 fl4->flowi4_proto = IPPROTO_UDP; 807 fl4->daddr = info->key.u.ipv4.dst; 808 fl4->saddr = info->key.u.ipv4.src; 809 fl4->fl4_dport = dport; 810 fl4->fl4_sport = sport; 811 fl4->flowi4_flags = info->key.flow_flags; 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 if (full_tos) 820 *full_tos = tos; 821 822 dst_cache = (struct dst_cache *)&info->dst_cache; 823 if (use_cache) { 824 rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); 825 if (rt) 826 return rt; 827 } 828 rt = ip_route_output_key(geneve->net, fl4); 829 if (IS_ERR(rt)) { 830 netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); 831 return ERR_PTR(-ENETUNREACH); 832 } 833 if (rt->dst.dev == dev) { /* is this necessary? */ 834 netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); 835 ip_rt_put(rt); 836 return ERR_PTR(-ELOOP); 837 } 838 if (use_cache) 839 dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); 840 return rt; 841 } 842 843 #if IS_ENABLED(CONFIG_IPV6) 844 static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, 845 struct net_device *dev, 846 struct geneve_sock *gs6, 847 struct flowi6 *fl6, 848 const struct ip_tunnel_info *info, 849 __be16 dport, __be16 sport) 850 { 851 bool use_cache = ip_tunnel_dst_cache_usable(skb, info); 852 struct geneve_dev *geneve = netdev_priv(dev); 853 struct dst_entry *dst = NULL; 854 struct dst_cache *dst_cache; 855 __u8 prio; 856 857 if (!gs6) 858 return ERR_PTR(-EIO); 859 860 memset(fl6, 0, sizeof(*fl6)); 861 fl6->flowi6_mark = skb->mark; 862 fl6->flowi6_proto = IPPROTO_UDP; 863 fl6->daddr = info->key.u.ipv6.dst; 864 fl6->saddr = info->key.u.ipv6.src; 865 fl6->fl6_dport = dport; 866 fl6->fl6_sport = sport; 867 868 prio = info->key.tos; 869 if ((prio == 1) && !geneve->cfg.collect_md) { 870 prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 871 use_cache = false; 872 } 873 874 fl6->flowlabel = ip6_make_flowinfo(prio, info->key.label); 875 dst_cache = (struct dst_cache *)&info->dst_cache; 876 if (use_cache) { 877 dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); 878 if (dst) 879 return dst; 880 } 881 dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, 882 NULL); 883 if (IS_ERR(dst)) { 884 netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); 885 return ERR_PTR(-ENETUNREACH); 886 } 887 if (dst->dev == dev) { /* is this necessary? */ 888 netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); 889 dst_release(dst); 890 return ERR_PTR(-ELOOP); 891 } 892 893 if (use_cache) 894 dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); 895 return dst; 896 } 897 #endif 898 899 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 900 struct geneve_dev *geneve, 901 const struct ip_tunnel_info *info) 902 { 903 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 904 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 905 const struct ip_tunnel_key *key = &info->key; 906 struct rtable *rt; 907 struct flowi4 fl4; 908 __u8 full_tos; 909 __u8 tos, ttl; 910 __be16 df = 0; 911 __be16 sport; 912 int err; 913 914 if (!pskb_inet_may_pull(skb)) 915 return -EINVAL; 916 917 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 918 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 919 geneve->cfg.info.key.tp_dst, sport, &full_tos); 920 if (IS_ERR(rt)) 921 return PTR_ERR(rt); 922 923 err = skb_tunnel_check_pmtu(skb, &rt->dst, 924 GENEVE_IPV4_HLEN + info->options_len, 925 netif_is_any_bridge_port(dev)); 926 if (err < 0) { 927 dst_release(&rt->dst); 928 return err; 929 } else if (err) { 930 struct ip_tunnel_info *info; 931 932 info = skb_tunnel_info(skb); 933 if (info) { 934 struct ip_tunnel_info *unclone; 935 936 unclone = skb_tunnel_info_unclone(skb); 937 if (unlikely(!unclone)) { 938 dst_release(&rt->dst); 939 return -ENOMEM; 940 } 941 942 unclone->key.u.ipv4.dst = fl4.saddr; 943 unclone->key.u.ipv4.src = fl4.daddr; 944 } 945 946 if (!pskb_may_pull(skb, ETH_HLEN)) { 947 dst_release(&rt->dst); 948 return -EINVAL; 949 } 950 951 skb->protocol = eth_type_trans(skb, geneve->dev); 952 __netif_rx(skb); 953 dst_release(&rt->dst); 954 return -EMSGSIZE; 955 } 956 957 if (geneve->cfg.collect_md) { 958 tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 959 ttl = key->ttl; 960 961 df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; 962 } else { 963 tos = ip_tunnel_ecn_encap(full_tos, ip_hdr(skb), skb); 964 if (geneve->cfg.ttl_inherit) 965 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 966 else 967 ttl = key->ttl; 968 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 969 970 if (geneve->cfg.df == GENEVE_DF_SET) { 971 df = htons(IP_DF); 972 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 973 struct ethhdr *eth = eth_hdr(skb); 974 975 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 976 df = htons(IP_DF); 977 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 978 struct iphdr *iph = ip_hdr(skb); 979 980 if (iph->frag_off & htons(IP_DF)) 981 df = htons(IP_DF); 982 } 983 } 984 } 985 986 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr), 987 geneve->cfg.inner_proto_inherit); 988 if (unlikely(err)) 989 return err; 990 991 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, 992 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 993 !net_eq(geneve->net, dev_net(geneve->dev)), 994 !(info->key.tun_flags & TUNNEL_CSUM)); 995 return 0; 996 } 997 998 #if IS_ENABLED(CONFIG_IPV6) 999 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 1000 struct geneve_dev *geneve, 1001 const struct ip_tunnel_info *info) 1002 { 1003 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 1004 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1005 const struct ip_tunnel_key *key = &info->key; 1006 struct dst_entry *dst = NULL; 1007 struct flowi6 fl6; 1008 __u8 prio, ttl; 1009 __be16 sport; 1010 int err; 1011 1012 if (!pskb_inet_may_pull(skb)) 1013 return -EINVAL; 1014 1015 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 1016 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1017 geneve->cfg.info.key.tp_dst, sport); 1018 if (IS_ERR(dst)) 1019 return PTR_ERR(dst); 1020 1021 err = skb_tunnel_check_pmtu(skb, dst, 1022 GENEVE_IPV6_HLEN + info->options_len, 1023 netif_is_any_bridge_port(dev)); 1024 if (err < 0) { 1025 dst_release(dst); 1026 return err; 1027 } else if (err) { 1028 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1029 1030 if (info) { 1031 struct ip_tunnel_info *unclone; 1032 1033 unclone = skb_tunnel_info_unclone(skb); 1034 if (unlikely(!unclone)) { 1035 dst_release(dst); 1036 return -ENOMEM; 1037 } 1038 1039 unclone->key.u.ipv6.dst = fl6.saddr; 1040 unclone->key.u.ipv6.src = fl6.daddr; 1041 } 1042 1043 if (!pskb_may_pull(skb, ETH_HLEN)) { 1044 dst_release(dst); 1045 return -EINVAL; 1046 } 1047 1048 skb->protocol = eth_type_trans(skb, geneve->dev); 1049 __netif_rx(skb); 1050 dst_release(dst); 1051 return -EMSGSIZE; 1052 } 1053 1054 if (geneve->cfg.collect_md) { 1055 prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); 1056 ttl = key->ttl; 1057 } else { 1058 prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), 1059 ip_hdr(skb), skb); 1060 if (geneve->cfg.ttl_inherit) 1061 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1062 else 1063 ttl = key->ttl; 1064 ttl = ttl ? : ip6_dst_hoplimit(dst); 1065 } 1066 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr), 1067 geneve->cfg.inner_proto_inherit); 1068 if (unlikely(err)) 1069 return err; 1070 1071 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1072 &fl6.saddr, &fl6.daddr, prio, ttl, 1073 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1074 !(info->key.tun_flags & TUNNEL_CSUM)); 1075 return 0; 1076 } 1077 #endif 1078 1079 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1080 { 1081 struct geneve_dev *geneve = netdev_priv(dev); 1082 struct ip_tunnel_info *info = NULL; 1083 int err; 1084 1085 if (geneve->cfg.collect_md) { 1086 info = skb_tunnel_info(skb); 1087 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1088 netdev_dbg(dev, "no tunnel metadata\n"); 1089 dev_kfree_skb(skb); 1090 dev->stats.tx_dropped++; 1091 return NETDEV_TX_OK; 1092 } 1093 } else { 1094 info = &geneve->cfg.info; 1095 } 1096 1097 rcu_read_lock(); 1098 #if IS_ENABLED(CONFIG_IPV6) 1099 if (info->mode & IP_TUNNEL_INFO_IPV6) 1100 err = geneve6_xmit_skb(skb, dev, geneve, info); 1101 else 1102 #endif 1103 err = geneve_xmit_skb(skb, dev, geneve, info); 1104 rcu_read_unlock(); 1105 1106 if (likely(!err)) 1107 return NETDEV_TX_OK; 1108 1109 if (err != -EMSGSIZE) 1110 dev_kfree_skb(skb); 1111 1112 if (err == -ELOOP) 1113 dev->stats.collisions++; 1114 else if (err == -ENETUNREACH) 1115 dev->stats.tx_carrier_errors++; 1116 1117 dev->stats.tx_errors++; 1118 return NETDEV_TX_OK; 1119 } 1120 1121 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1122 { 1123 if (new_mtu > dev->max_mtu) 1124 new_mtu = dev->max_mtu; 1125 else if (new_mtu < dev->min_mtu) 1126 new_mtu = dev->min_mtu; 1127 1128 dev->mtu = new_mtu; 1129 return 0; 1130 } 1131 1132 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1133 { 1134 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1135 struct geneve_dev *geneve = netdev_priv(dev); 1136 __be16 sport; 1137 1138 if (ip_tunnel_info_af(info) == AF_INET) { 1139 struct rtable *rt; 1140 struct flowi4 fl4; 1141 1142 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1143 sport = udp_flow_src_port(geneve->net, skb, 1144 1, USHRT_MAX, true); 1145 1146 rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, 1147 geneve->cfg.info.key.tp_dst, sport, NULL); 1148 if (IS_ERR(rt)) 1149 return PTR_ERR(rt); 1150 1151 ip_rt_put(rt); 1152 info->key.u.ipv4.src = fl4.saddr; 1153 #if IS_ENABLED(CONFIG_IPV6) 1154 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1155 struct dst_entry *dst; 1156 struct flowi6 fl6; 1157 1158 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1159 sport = udp_flow_src_port(geneve->net, skb, 1160 1, USHRT_MAX, true); 1161 1162 dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, 1163 geneve->cfg.info.key.tp_dst, sport); 1164 if (IS_ERR(dst)) 1165 return PTR_ERR(dst); 1166 1167 dst_release(dst); 1168 info->key.u.ipv6.src = fl6.saddr; 1169 #endif 1170 } else { 1171 return -EINVAL; 1172 } 1173 1174 info->key.tp_src = sport; 1175 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1176 return 0; 1177 } 1178 1179 static const struct net_device_ops geneve_netdev_ops = { 1180 .ndo_init = geneve_init, 1181 .ndo_uninit = geneve_uninit, 1182 .ndo_open = geneve_open, 1183 .ndo_stop = geneve_stop, 1184 .ndo_start_xmit = geneve_xmit, 1185 .ndo_get_stats64 = dev_get_tstats64, 1186 .ndo_change_mtu = geneve_change_mtu, 1187 .ndo_validate_addr = eth_validate_addr, 1188 .ndo_set_mac_address = eth_mac_addr, 1189 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1190 }; 1191 1192 static void geneve_get_drvinfo(struct net_device *dev, 1193 struct ethtool_drvinfo *drvinfo) 1194 { 1195 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1196 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1197 } 1198 1199 static const struct ethtool_ops geneve_ethtool_ops = { 1200 .get_drvinfo = geneve_get_drvinfo, 1201 .get_link = ethtool_op_get_link, 1202 }; 1203 1204 /* Info for udev, that this is a virtual tunnel endpoint */ 1205 static struct device_type geneve_type = { 1206 .name = "geneve", 1207 }; 1208 1209 /* Calls the ndo_udp_tunnel_add of the caller in order to 1210 * supply the listening GENEVE udp ports. Callers are expected 1211 * to implement the ndo_udp_tunnel_add. 1212 */ 1213 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1214 { 1215 struct net *net = dev_net(dev); 1216 struct geneve_net *gn = net_generic(net, geneve_net_id); 1217 struct geneve_sock *gs; 1218 1219 rcu_read_lock(); 1220 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1221 if (push) { 1222 udp_tunnel_push_rx_port(dev, gs->sock, 1223 UDP_TUNNEL_TYPE_GENEVE); 1224 } else { 1225 udp_tunnel_drop_rx_port(dev, gs->sock, 1226 UDP_TUNNEL_TYPE_GENEVE); 1227 } 1228 } 1229 rcu_read_unlock(); 1230 } 1231 1232 /* Initialize the device structure. */ 1233 static void geneve_setup(struct net_device *dev) 1234 { 1235 ether_setup(dev); 1236 1237 dev->netdev_ops = &geneve_netdev_ops; 1238 dev->ethtool_ops = &geneve_ethtool_ops; 1239 dev->needs_free_netdev = true; 1240 1241 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1242 1243 dev->features |= NETIF_F_LLTX; 1244 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1245 dev->features |= NETIF_F_RXCSUM; 1246 dev->features |= NETIF_F_GSO_SOFTWARE; 1247 1248 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1249 dev->hw_features |= NETIF_F_RXCSUM; 1250 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1251 1252 /* MTU range: 68 - (something less than 65535) */ 1253 dev->min_mtu = ETH_MIN_MTU; 1254 /* The max_mtu calculation does not take account of GENEVE 1255 * options, to avoid excluding potentially valid 1256 * configurations. This will be further reduced by IPvX hdr size. 1257 */ 1258 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1259 1260 netif_keep_dst(dev); 1261 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1262 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1263 eth_hw_addr_random(dev); 1264 } 1265 1266 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1267 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, 1268 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1269 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1270 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1271 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1272 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1273 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1274 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1275 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1276 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1277 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1278 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1279 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1280 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1281 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, 1282 }; 1283 1284 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1285 struct netlink_ext_ack *extack) 1286 { 1287 if (tb[IFLA_ADDRESS]) { 1288 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1289 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1290 "Provided link layer address is not Ethernet"); 1291 return -EINVAL; 1292 } 1293 1294 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1295 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1296 "Provided Ethernet address is not unicast"); 1297 return -EADDRNOTAVAIL; 1298 } 1299 } 1300 1301 if (!data) { 1302 NL_SET_ERR_MSG(extack, 1303 "Not enough attributes provided to perform the operation"); 1304 return -EINVAL; 1305 } 1306 1307 if (data[IFLA_GENEVE_ID]) { 1308 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1309 1310 if (vni >= GENEVE_N_VID) { 1311 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1312 "Geneve ID must be lower than 16777216"); 1313 return -ERANGE; 1314 } 1315 } 1316 1317 if (data[IFLA_GENEVE_DF]) { 1318 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1319 1320 if (df < 0 || df > GENEVE_DF_MAX) { 1321 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1322 "Invalid DF attribute"); 1323 return -EINVAL; 1324 } 1325 } 1326 1327 return 0; 1328 } 1329 1330 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1331 const struct ip_tunnel_info *info, 1332 bool *tun_on_same_port, 1333 bool *tun_collect_md) 1334 { 1335 struct geneve_dev *geneve, *t = NULL; 1336 1337 *tun_on_same_port = false; 1338 *tun_collect_md = false; 1339 list_for_each_entry(geneve, &gn->geneve_list, next) { 1340 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1341 *tun_collect_md = geneve->cfg.collect_md; 1342 *tun_on_same_port = true; 1343 } 1344 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1345 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1346 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1347 t = geneve; 1348 } 1349 return t; 1350 } 1351 1352 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1353 { 1354 return !(info->key.tun_id || info->key.tun_flags || info->key.tos || 1355 info->key.ttl || info->key.label || info->key.tp_src || 1356 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1357 } 1358 1359 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1360 struct ip_tunnel_info *b) 1361 { 1362 if (ip_tunnel_info_af(a) == AF_INET) 1363 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1364 else 1365 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1366 } 1367 1368 static int geneve_configure(struct net *net, struct net_device *dev, 1369 struct netlink_ext_ack *extack, 1370 const struct geneve_config *cfg) 1371 { 1372 struct geneve_net *gn = net_generic(net, geneve_net_id); 1373 struct geneve_dev *t, *geneve = netdev_priv(dev); 1374 const struct ip_tunnel_info *info = &cfg->info; 1375 bool tun_collect_md, tun_on_same_port; 1376 int err, encap_len; 1377 1378 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1379 NL_SET_ERR_MSG(extack, 1380 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1381 return -EINVAL; 1382 } 1383 1384 geneve->net = net; 1385 geneve->dev = dev; 1386 1387 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1388 if (t) 1389 return -EBUSY; 1390 1391 /* make enough headroom for basic scenario */ 1392 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1393 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1394 encap_len += sizeof(struct iphdr); 1395 dev->max_mtu -= sizeof(struct iphdr); 1396 } else { 1397 encap_len += sizeof(struct ipv6hdr); 1398 dev->max_mtu -= sizeof(struct ipv6hdr); 1399 } 1400 dev->needed_headroom = encap_len + ETH_HLEN; 1401 1402 if (cfg->collect_md) { 1403 if (tun_on_same_port) { 1404 NL_SET_ERR_MSG(extack, 1405 "There can be only one externally controlled device on a destination port"); 1406 return -EPERM; 1407 } 1408 } else { 1409 if (tun_collect_md) { 1410 NL_SET_ERR_MSG(extack, 1411 "There already exists an externally controlled device on this destination port"); 1412 return -EPERM; 1413 } 1414 } 1415 1416 dst_cache_reset(&geneve->cfg.info.dst_cache); 1417 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1418 1419 if (geneve->cfg.inner_proto_inherit) { 1420 dev->header_ops = NULL; 1421 dev->type = ARPHRD_NONE; 1422 dev->hard_header_len = 0; 1423 dev->addr_len = 0; 1424 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1425 } 1426 1427 err = register_netdevice(dev); 1428 if (err) 1429 return err; 1430 1431 list_add(&geneve->next, &gn->geneve_list); 1432 return 0; 1433 } 1434 1435 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1436 { 1437 memset(info, 0, sizeof(*info)); 1438 info->key.tp_dst = htons(dst_port); 1439 } 1440 1441 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1442 struct netlink_ext_ack *extack, 1443 struct geneve_config *cfg, bool changelink) 1444 { 1445 struct ip_tunnel_info *info = &cfg->info; 1446 int attrtype; 1447 1448 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1449 NL_SET_ERR_MSG(extack, 1450 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1451 return -EINVAL; 1452 } 1453 1454 if (data[IFLA_GENEVE_REMOTE]) { 1455 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1456 attrtype = IFLA_GENEVE_REMOTE; 1457 goto change_notsup; 1458 } 1459 1460 info->key.u.ipv4.dst = 1461 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1462 1463 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1464 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1465 "Remote IPv4 address cannot be Multicast"); 1466 return -EINVAL; 1467 } 1468 } 1469 1470 if (data[IFLA_GENEVE_REMOTE6]) { 1471 #if IS_ENABLED(CONFIG_IPV6) 1472 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1473 attrtype = IFLA_GENEVE_REMOTE6; 1474 goto change_notsup; 1475 } 1476 1477 info->mode = IP_TUNNEL_INFO_IPV6; 1478 info->key.u.ipv6.dst = 1479 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1480 1481 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1482 IPV6_ADDR_LINKLOCAL) { 1483 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1484 "Remote IPv6 address cannot be link-local"); 1485 return -EINVAL; 1486 } 1487 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1488 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1489 "Remote IPv6 address cannot be Multicast"); 1490 return -EINVAL; 1491 } 1492 info->key.tun_flags |= TUNNEL_CSUM; 1493 cfg->use_udp6_rx_checksums = true; 1494 #else 1495 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1496 "IPv6 support not enabled in the kernel"); 1497 return -EPFNOSUPPORT; 1498 #endif 1499 } 1500 1501 if (data[IFLA_GENEVE_ID]) { 1502 __u32 vni; 1503 __u8 tvni[3]; 1504 __be64 tunid; 1505 1506 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1507 tvni[0] = (vni & 0x00ff0000) >> 16; 1508 tvni[1] = (vni & 0x0000ff00) >> 8; 1509 tvni[2] = vni & 0x000000ff; 1510 1511 tunid = vni_to_tunnel_id(tvni); 1512 if (changelink && (tunid != info->key.tun_id)) { 1513 attrtype = IFLA_GENEVE_ID; 1514 goto change_notsup; 1515 } 1516 info->key.tun_id = tunid; 1517 } 1518 1519 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1520 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1521 cfg->ttl_inherit = true; 1522 else 1523 cfg->ttl_inherit = false; 1524 } else if (data[IFLA_GENEVE_TTL]) { 1525 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1526 cfg->ttl_inherit = false; 1527 } 1528 1529 if (data[IFLA_GENEVE_TOS]) 1530 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1531 1532 if (data[IFLA_GENEVE_DF]) 1533 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1534 1535 if (data[IFLA_GENEVE_LABEL]) { 1536 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1537 IPV6_FLOWLABEL_MASK; 1538 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1539 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1540 "Label attribute only applies for IPv6 Geneve devices"); 1541 return -EINVAL; 1542 } 1543 } 1544 1545 if (data[IFLA_GENEVE_PORT]) { 1546 if (changelink) { 1547 attrtype = IFLA_GENEVE_PORT; 1548 goto change_notsup; 1549 } 1550 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1551 } 1552 1553 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1554 if (changelink) { 1555 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1556 goto change_notsup; 1557 } 1558 cfg->collect_md = true; 1559 } 1560 1561 if (data[IFLA_GENEVE_UDP_CSUM]) { 1562 if (changelink) { 1563 attrtype = IFLA_GENEVE_UDP_CSUM; 1564 goto change_notsup; 1565 } 1566 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1567 info->key.tun_flags |= TUNNEL_CSUM; 1568 } 1569 1570 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1571 #if IS_ENABLED(CONFIG_IPV6) 1572 if (changelink) { 1573 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1574 goto change_notsup; 1575 } 1576 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1577 info->key.tun_flags &= ~TUNNEL_CSUM; 1578 #else 1579 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1580 "IPv6 support not enabled in the kernel"); 1581 return -EPFNOSUPPORT; 1582 #endif 1583 } 1584 1585 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1586 #if IS_ENABLED(CONFIG_IPV6) 1587 if (changelink) { 1588 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1589 goto change_notsup; 1590 } 1591 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1592 cfg->use_udp6_rx_checksums = false; 1593 #else 1594 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1595 "IPv6 support not enabled in the kernel"); 1596 return -EPFNOSUPPORT; 1597 #endif 1598 } 1599 1600 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { 1601 if (changelink) { 1602 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; 1603 goto change_notsup; 1604 } 1605 cfg->inner_proto_inherit = true; 1606 } 1607 1608 return 0; 1609 change_notsup: 1610 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1611 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported"); 1612 return -EOPNOTSUPP; 1613 } 1614 1615 static void geneve_link_config(struct net_device *dev, 1616 struct ip_tunnel_info *info, struct nlattr *tb[]) 1617 { 1618 struct geneve_dev *geneve = netdev_priv(dev); 1619 int ldev_mtu = 0; 1620 1621 if (tb[IFLA_MTU]) { 1622 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1623 return; 1624 } 1625 1626 switch (ip_tunnel_info_af(info)) { 1627 case AF_INET: { 1628 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1629 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1630 1631 if (!IS_ERR(rt) && rt->dst.dev) { 1632 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1633 ip_rt_put(rt); 1634 } 1635 break; 1636 } 1637 #if IS_ENABLED(CONFIG_IPV6) 1638 case AF_INET6: { 1639 struct rt6_info *rt; 1640 1641 if (!__in6_dev_get(dev)) 1642 break; 1643 1644 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1645 NULL, 0); 1646 1647 if (rt && rt->dst.dev) 1648 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1649 ip6_rt_put(rt); 1650 break; 1651 } 1652 #endif 1653 } 1654 1655 if (ldev_mtu <= 0) 1656 return; 1657 1658 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1659 } 1660 1661 static int geneve_newlink(struct net *net, struct net_device *dev, 1662 struct nlattr *tb[], struct nlattr *data[], 1663 struct netlink_ext_ack *extack) 1664 { 1665 struct geneve_config cfg = { 1666 .df = GENEVE_DF_UNSET, 1667 .use_udp6_rx_checksums = false, 1668 .ttl_inherit = false, 1669 .collect_md = false, 1670 }; 1671 int err; 1672 1673 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1674 err = geneve_nl2info(tb, data, extack, &cfg, false); 1675 if (err) 1676 return err; 1677 1678 err = geneve_configure(net, dev, extack, &cfg); 1679 if (err) 1680 return err; 1681 1682 geneve_link_config(dev, &cfg.info, tb); 1683 1684 return 0; 1685 } 1686 1687 /* Quiesces the geneve device data path for both TX and RX. 1688 * 1689 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1690 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1691 * to complete for the existing set of in-flight packets to be transmitted, 1692 * then we would have quiesced the transmit data path. All the future packets 1693 * will get dropped until we unquiesce the data path. 1694 * 1695 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1696 * if we set that to NULL under RCU and wait for synchronize_net() to 1697 * complete, then we would have quiesced the receive data path. 1698 */ 1699 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1700 struct geneve_sock **gs6) 1701 { 1702 *gs4 = rtnl_dereference(geneve->sock4); 1703 rcu_assign_pointer(geneve->sock4, NULL); 1704 if (*gs4) 1705 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1706 #if IS_ENABLED(CONFIG_IPV6) 1707 *gs6 = rtnl_dereference(geneve->sock6); 1708 rcu_assign_pointer(geneve->sock6, NULL); 1709 if (*gs6) 1710 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1711 #else 1712 *gs6 = NULL; 1713 #endif 1714 synchronize_net(); 1715 } 1716 1717 /* Resumes the geneve device data path for both TX and RX. */ 1718 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1719 struct geneve_sock __maybe_unused *gs6) 1720 { 1721 rcu_assign_pointer(geneve->sock4, gs4); 1722 if (gs4) 1723 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1724 #if IS_ENABLED(CONFIG_IPV6) 1725 rcu_assign_pointer(geneve->sock6, gs6); 1726 if (gs6) 1727 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1728 #endif 1729 synchronize_net(); 1730 } 1731 1732 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1733 struct nlattr *data[], 1734 struct netlink_ext_ack *extack) 1735 { 1736 struct geneve_dev *geneve = netdev_priv(dev); 1737 struct geneve_sock *gs4, *gs6; 1738 struct geneve_config cfg; 1739 int err; 1740 1741 /* If the geneve device is configured for metadata (or externally 1742 * controlled, for example, OVS), then nothing can be changed. 1743 */ 1744 if (geneve->cfg.collect_md) 1745 return -EOPNOTSUPP; 1746 1747 /* Start with the existing info. */ 1748 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1749 err = geneve_nl2info(tb, data, extack, &cfg, true); 1750 if (err) 1751 return err; 1752 1753 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1754 dst_cache_reset(&cfg.info.dst_cache); 1755 geneve_link_config(dev, &cfg.info, tb); 1756 } 1757 1758 geneve_quiesce(geneve, &gs4, &gs6); 1759 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1760 geneve_unquiesce(geneve, gs4, gs6); 1761 1762 return 0; 1763 } 1764 1765 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1766 { 1767 struct geneve_dev *geneve = netdev_priv(dev); 1768 1769 list_del(&geneve->next); 1770 unregister_netdevice_queue(dev, head); 1771 } 1772 1773 static size_t geneve_get_size(const struct net_device *dev) 1774 { 1775 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1776 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1777 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1778 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1779 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1780 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1781 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1782 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1783 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1784 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1785 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1786 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1787 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ 1788 0; 1789 } 1790 1791 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1792 { 1793 struct geneve_dev *geneve = netdev_priv(dev); 1794 struct ip_tunnel_info *info = &geneve->cfg.info; 1795 bool ttl_inherit = geneve->cfg.ttl_inherit; 1796 bool metadata = geneve->cfg.collect_md; 1797 __u8 tmp_vni[3]; 1798 __u32 vni; 1799 1800 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1801 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1802 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1803 goto nla_put_failure; 1804 1805 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1806 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1807 info->key.u.ipv4.dst)) 1808 goto nla_put_failure; 1809 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1810 !!(info->key.tun_flags & TUNNEL_CSUM))) 1811 goto nla_put_failure; 1812 1813 #if IS_ENABLED(CONFIG_IPV6) 1814 } else if (!metadata) { 1815 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1816 &info->key.u.ipv6.dst)) 1817 goto nla_put_failure; 1818 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1819 !(info->key.tun_flags & TUNNEL_CSUM))) 1820 goto nla_put_failure; 1821 #endif 1822 } 1823 1824 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1825 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1826 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1827 goto nla_put_failure; 1828 1829 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1830 goto nla_put_failure; 1831 1832 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1833 goto nla_put_failure; 1834 1835 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1836 goto nla_put_failure; 1837 1838 #if IS_ENABLED(CONFIG_IPV6) 1839 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1840 !geneve->cfg.use_udp6_rx_checksums)) 1841 goto nla_put_failure; 1842 #endif 1843 1844 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1845 goto nla_put_failure; 1846 1847 if (geneve->cfg.inner_proto_inherit && 1848 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) 1849 goto nla_put_failure; 1850 1851 return 0; 1852 1853 nla_put_failure: 1854 return -EMSGSIZE; 1855 } 1856 1857 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1858 .kind = "geneve", 1859 .maxtype = IFLA_GENEVE_MAX, 1860 .policy = geneve_policy, 1861 .priv_size = sizeof(struct geneve_dev), 1862 .setup = geneve_setup, 1863 .validate = geneve_validate, 1864 .newlink = geneve_newlink, 1865 .changelink = geneve_changelink, 1866 .dellink = geneve_dellink, 1867 .get_size = geneve_get_size, 1868 .fill_info = geneve_fill_info, 1869 }; 1870 1871 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1872 u8 name_assign_type, u16 dst_port) 1873 { 1874 struct nlattr *tb[IFLA_MAX + 1]; 1875 struct net_device *dev; 1876 LIST_HEAD(list_kill); 1877 int err; 1878 struct geneve_config cfg = { 1879 .df = GENEVE_DF_UNSET, 1880 .use_udp6_rx_checksums = true, 1881 .ttl_inherit = false, 1882 .collect_md = true, 1883 }; 1884 1885 memset(tb, 0, sizeof(tb)); 1886 dev = rtnl_create_link(net, name, name_assign_type, 1887 &geneve_link_ops, tb, NULL); 1888 if (IS_ERR(dev)) 1889 return dev; 1890 1891 init_tnl_info(&cfg.info, dst_port); 1892 err = geneve_configure(net, dev, NULL, &cfg); 1893 if (err) { 1894 free_netdev(dev); 1895 return ERR_PTR(err); 1896 } 1897 1898 /* openvswitch users expect packet sizes to be unrestricted, 1899 * so set the largest MTU we can. 1900 */ 1901 err = geneve_change_mtu(dev, IP_MAX_MTU); 1902 if (err) 1903 goto err; 1904 1905 err = rtnl_configure_link(dev, NULL, 0, NULL); 1906 if (err < 0) 1907 goto err; 1908 1909 return dev; 1910 err: 1911 geneve_dellink(dev, &list_kill); 1912 unregister_netdevice_many(&list_kill); 1913 return ERR_PTR(err); 1914 } 1915 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1916 1917 static int geneve_netdevice_event(struct notifier_block *unused, 1918 unsigned long event, void *ptr) 1919 { 1920 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1921 1922 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1923 geneve_offload_rx_ports(dev, true); 1924 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 1925 geneve_offload_rx_ports(dev, false); 1926 1927 return NOTIFY_DONE; 1928 } 1929 1930 static struct notifier_block geneve_notifier_block __read_mostly = { 1931 .notifier_call = geneve_netdevice_event, 1932 }; 1933 1934 static __net_init int geneve_init_net(struct net *net) 1935 { 1936 struct geneve_net *gn = net_generic(net, geneve_net_id); 1937 1938 INIT_LIST_HEAD(&gn->geneve_list); 1939 INIT_LIST_HEAD(&gn->sock_list); 1940 return 0; 1941 } 1942 1943 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1944 { 1945 struct geneve_net *gn = net_generic(net, geneve_net_id); 1946 struct geneve_dev *geneve, *next; 1947 struct net_device *dev, *aux; 1948 1949 /* gather any geneve devices that were moved into this ns */ 1950 for_each_netdev_safe(net, dev, aux) 1951 if (dev->rtnl_link_ops == &geneve_link_ops) 1952 unregister_netdevice_queue(dev, head); 1953 1954 /* now gather any other geneve devices that were created in this ns */ 1955 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1956 /* If geneve->dev is in the same netns, it was already added 1957 * to the list by the previous loop. 1958 */ 1959 if (!net_eq(dev_net(geneve->dev), net)) 1960 unregister_netdevice_queue(geneve->dev, head); 1961 } 1962 } 1963 1964 static void __net_exit geneve_exit_batch_net(struct list_head *net_list) 1965 { 1966 struct net *net; 1967 LIST_HEAD(list); 1968 1969 rtnl_lock(); 1970 list_for_each_entry(net, net_list, exit_list) 1971 geneve_destroy_tunnels(net, &list); 1972 1973 /* unregister the devices gathered above */ 1974 unregister_netdevice_many(&list); 1975 rtnl_unlock(); 1976 1977 list_for_each_entry(net, net_list, exit_list) { 1978 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1979 1980 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1981 } 1982 } 1983 1984 static struct pernet_operations geneve_net_ops = { 1985 .init = geneve_init_net, 1986 .exit_batch = geneve_exit_batch_net, 1987 .id = &geneve_net_id, 1988 .size = sizeof(struct geneve_net), 1989 }; 1990 1991 static int __init geneve_init_module(void) 1992 { 1993 int rc; 1994 1995 rc = register_pernet_subsys(&geneve_net_ops); 1996 if (rc) 1997 goto out1; 1998 1999 rc = register_netdevice_notifier(&geneve_notifier_block); 2000 if (rc) 2001 goto out2; 2002 2003 rc = rtnl_link_register(&geneve_link_ops); 2004 if (rc) 2005 goto out3; 2006 2007 return 0; 2008 out3: 2009 unregister_netdevice_notifier(&geneve_notifier_block); 2010 out2: 2011 unregister_pernet_subsys(&geneve_net_ops); 2012 out1: 2013 return rc; 2014 } 2015 late_initcall(geneve_init_module); 2016 2017 static void __exit geneve_cleanup_module(void) 2018 { 2019 rtnl_link_unregister(&geneve_link_ops); 2020 unregister_netdevice_notifier(&geneve_notifier_block); 2021 unregister_pernet_subsys(&geneve_net_ops); 2022 } 2023 module_exit(geneve_cleanup_module); 2024 2025 MODULE_LICENSE("GPL"); 2026 MODULE_VERSION(GENEVE_NETDEV_VER); 2027 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 2028 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 2029 MODULE_ALIAS_RTNL_LINK("geneve"); 2030