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 nh, err = 0; 225 void *oiph; 226 227 if (ip_tunnel_collect_metadata() || gs->collect_md) { 228 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 229 230 __set_bit(IP_TUNNEL_KEY_BIT, flags); 231 __assign_bit(IP_TUNNEL_OAM_BIT, flags, gnvh->oam); 232 __assign_bit(IP_TUNNEL_CRIT_OPT_BIT, flags, gnvh->critical); 233 234 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 235 vni_to_tunnel_id(gnvh->vni), 236 gnvh->opt_len * 4); 237 if (!tun_dst) { 238 DEV_STATS_INC(geneve->dev, rx_dropped); 239 goto drop; 240 } 241 /* Update tunnel dst according to Geneve options. */ 242 ip_tunnel_flags_zero(flags); 243 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, flags); 244 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 245 gnvh->options, gnvh->opt_len * 4, 246 flags); 247 } else { 248 /* Drop packets w/ critical options, 249 * since we don't support any... 250 */ 251 if (gnvh->critical) { 252 DEV_STATS_INC(geneve->dev, rx_frame_errors); 253 DEV_STATS_INC(geneve->dev, rx_errors); 254 goto drop; 255 } 256 } 257 258 if (tun_dst) 259 skb_dst_set(skb, &tun_dst->dst); 260 261 if (gnvh->proto_type == htons(ETH_P_TEB)) { 262 skb_reset_mac_header(skb); 263 skb->protocol = eth_type_trans(skb, geneve->dev); 264 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 265 266 /* Ignore packet loops (and multicast echo) */ 267 if (ether_addr_equal(eth_hdr(skb)->h_source, 268 geneve->dev->dev_addr)) { 269 DEV_STATS_INC(geneve->dev, rx_errors); 270 goto drop; 271 } 272 } else { 273 skb_reset_mac_header(skb); 274 skb->dev = geneve->dev; 275 skb->pkt_type = PACKET_HOST; 276 } 277 278 /* Save offset of outer header relative to skb->head, 279 * because we are going to reset the network header to the inner header 280 * and might change skb->head. 281 */ 282 nh = skb_network_header(skb) - skb->head; 283 284 skb_reset_network_header(skb); 285 286 if (!pskb_inet_may_pull(skb)) { 287 DEV_STATS_INC(geneve->dev, rx_length_errors); 288 DEV_STATS_INC(geneve->dev, rx_errors); 289 goto drop; 290 } 291 292 /* Get the outer header. */ 293 oiph = skb->head + nh; 294 295 if (geneve_get_sk_family(gs) == AF_INET) 296 err = IP_ECN_decapsulate(oiph, skb); 297 #if IS_ENABLED(CONFIG_IPV6) 298 else 299 err = IP6_ECN_decapsulate(oiph, skb); 300 #endif 301 302 if (unlikely(err)) { 303 if (log_ecn_error) { 304 if (geneve_get_sk_family(gs) == AF_INET) 305 net_info_ratelimited("non-ECT from %pI4 " 306 "with TOS=%#x\n", 307 &((struct iphdr *)oiph)->saddr, 308 ((struct iphdr *)oiph)->tos); 309 #if IS_ENABLED(CONFIG_IPV6) 310 else 311 net_info_ratelimited("non-ECT from %pI6\n", 312 &((struct ipv6hdr *)oiph)->saddr); 313 #endif 314 } 315 if (err > 1) { 316 DEV_STATS_INC(geneve->dev, rx_frame_errors); 317 DEV_STATS_INC(geneve->dev, rx_errors); 318 goto drop; 319 } 320 } 321 322 len = skb->len; 323 err = gro_cells_receive(&geneve->gro_cells, skb); 324 if (likely(err == NET_RX_SUCCESS)) 325 dev_sw_netstats_rx_add(geneve->dev, len); 326 327 return; 328 drop: 329 /* Consume bad packet */ 330 kfree_skb(skb); 331 } 332 333 /* Setup stats when device is created */ 334 static int geneve_init(struct net_device *dev) 335 { 336 struct geneve_dev *geneve = netdev_priv(dev); 337 int err; 338 339 err = gro_cells_init(&geneve->gro_cells, dev); 340 if (err) 341 return err; 342 343 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 344 if (err) { 345 gro_cells_destroy(&geneve->gro_cells); 346 return err; 347 } 348 netdev_lockdep_set_classes(dev); 349 return 0; 350 } 351 352 static void geneve_uninit(struct net_device *dev) 353 { 354 struct geneve_dev *geneve = netdev_priv(dev); 355 356 dst_cache_destroy(&geneve->cfg.info.dst_cache); 357 gro_cells_destroy(&geneve->gro_cells); 358 } 359 360 /* Callback from net/ipv4/udp.c to receive packets */ 361 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 362 { 363 struct genevehdr *geneveh; 364 struct geneve_dev *geneve; 365 struct geneve_sock *gs; 366 __be16 inner_proto; 367 int opts_len; 368 369 /* Need UDP and Geneve header to be present */ 370 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 371 goto drop; 372 373 /* Return packets with reserved bits set */ 374 geneveh = geneve_hdr(skb); 375 if (unlikely(geneveh->ver != GENEVE_VER)) 376 goto drop; 377 378 gs = rcu_dereference_sk_user_data(sk); 379 if (!gs) 380 goto drop; 381 382 geneve = geneve_lookup_skb(gs, skb); 383 if (!geneve) 384 goto drop; 385 386 inner_proto = geneveh->proto_type; 387 388 if (unlikely((!geneve->cfg.inner_proto_inherit && 389 inner_proto != htons(ETH_P_TEB)))) { 390 DEV_STATS_INC(geneve->dev, rx_dropped); 391 goto drop; 392 } 393 394 opts_len = geneveh->opt_len * 4; 395 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto, 396 !net_eq(geneve->net, dev_net(geneve->dev)))) { 397 DEV_STATS_INC(geneve->dev, rx_dropped); 398 goto drop; 399 } 400 401 geneve_rx(geneve, gs, skb); 402 return 0; 403 404 drop: 405 /* Consume bad packet */ 406 kfree_skb(skb); 407 return 0; 408 } 409 410 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 411 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 412 { 413 struct genevehdr *geneveh; 414 struct geneve_sock *gs; 415 u8 zero_vni[3] = { 0 }; 416 u8 *vni = zero_vni; 417 418 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 419 return -EINVAL; 420 421 geneveh = geneve_hdr(skb); 422 if (geneveh->ver != GENEVE_VER) 423 return -EINVAL; 424 425 if (geneveh->proto_type != htons(ETH_P_TEB)) 426 return -EINVAL; 427 428 gs = rcu_dereference_sk_user_data(sk); 429 if (!gs) 430 return -ENOENT; 431 432 if (geneve_get_sk_family(gs) == AF_INET) { 433 struct iphdr *iph = ip_hdr(skb); 434 __be32 addr4 = 0; 435 436 if (!gs->collect_md) { 437 vni = geneve_hdr(skb)->vni; 438 addr4 = iph->daddr; 439 } 440 441 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 442 } 443 444 #if IS_ENABLED(CONFIG_IPV6) 445 if (geneve_get_sk_family(gs) == AF_INET6) { 446 struct ipv6hdr *ip6h = ipv6_hdr(skb); 447 struct in6_addr addr6; 448 449 memset(&addr6, 0, sizeof(struct in6_addr)); 450 451 if (!gs->collect_md) { 452 vni = geneve_hdr(skb)->vni; 453 addr6 = ip6h->daddr; 454 } 455 456 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 457 } 458 #endif 459 460 return -EPFNOSUPPORT; 461 } 462 463 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 464 __be16 port, bool ipv6_rx_csum) 465 { 466 struct socket *sock; 467 struct udp_port_cfg udp_conf; 468 int err; 469 470 memset(&udp_conf, 0, sizeof(udp_conf)); 471 472 if (ipv6) { 473 udp_conf.family = AF_INET6; 474 udp_conf.ipv6_v6only = 1; 475 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 476 } else { 477 udp_conf.family = AF_INET; 478 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 479 } 480 481 udp_conf.local_udp_port = port; 482 483 /* Open UDP socket */ 484 err = udp_sock_create(net, &udp_conf, &sock); 485 if (err < 0) 486 return ERR_PTR(err); 487 488 udp_allow_gso(sock->sk); 489 return sock; 490 } 491 492 static int geneve_hlen(struct genevehdr *gh) 493 { 494 return sizeof(*gh) + gh->opt_len * 4; 495 } 496 497 static struct sk_buff *geneve_gro_receive(struct sock *sk, 498 struct list_head *head, 499 struct sk_buff *skb) 500 { 501 struct sk_buff *pp = NULL; 502 struct sk_buff *p; 503 struct genevehdr *gh, *gh2; 504 unsigned int hlen, gh_len, off_gnv; 505 const struct packet_offload *ptype; 506 __be16 type; 507 int flush = 1; 508 509 off_gnv = skb_gro_offset(skb); 510 hlen = off_gnv + sizeof(*gh); 511 gh = skb_gro_header(skb, hlen, off_gnv); 512 if (unlikely(!gh)) 513 goto out; 514 515 if (gh->ver != GENEVE_VER || gh->oam) 516 goto out; 517 gh_len = geneve_hlen(gh); 518 519 hlen = off_gnv + gh_len; 520 if (!skb_gro_may_pull(skb, hlen)) { 521 gh = skb_gro_header_slow(skb, hlen, off_gnv); 522 if (unlikely(!gh)) 523 goto out; 524 } 525 526 list_for_each_entry(p, head, list) { 527 if (!NAPI_GRO_CB(p)->same_flow) 528 continue; 529 530 gh2 = (struct genevehdr *)(p->data + off_gnv); 531 if (gh->opt_len != gh2->opt_len || 532 memcmp(gh, gh2, gh_len)) { 533 NAPI_GRO_CB(p)->same_flow = 0; 534 continue; 535 } 536 } 537 538 skb_gro_pull(skb, gh_len); 539 skb_gro_postpull_rcsum(skb, gh, gh_len); 540 type = gh->proto_type; 541 if (likely(type == htons(ETH_P_TEB))) 542 return call_gro_receive(eth_gro_receive, head, skb); 543 544 ptype = gro_find_receive_by_type(type); 545 if (!ptype) 546 goto out; 547 548 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 549 flush = 0; 550 551 out: 552 skb_gro_flush_final(skb, pp, flush); 553 554 return pp; 555 } 556 557 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 558 int nhoff) 559 { 560 struct genevehdr *gh; 561 struct packet_offload *ptype; 562 __be16 type; 563 int gh_len; 564 int err = -ENOSYS; 565 566 gh = (struct genevehdr *)(skb->data + nhoff); 567 gh_len = geneve_hlen(gh); 568 type = gh->proto_type; 569 570 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */ 571 if (likely(type == htons(ETH_P_TEB))) 572 return eth_gro_complete(skb, nhoff + gh_len); 573 574 ptype = gro_find_complete_by_type(type); 575 if (ptype) 576 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 577 578 skb_set_inner_mac_header(skb, nhoff + gh_len); 579 580 return err; 581 } 582 583 /* Create new listen socket if needed */ 584 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 585 bool ipv6, bool ipv6_rx_csum) 586 { 587 struct geneve_net *gn = net_generic(net, geneve_net_id); 588 struct geneve_sock *gs; 589 struct socket *sock; 590 struct udp_tunnel_sock_cfg tunnel_cfg; 591 int h; 592 593 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 594 if (!gs) 595 return ERR_PTR(-ENOMEM); 596 597 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 598 if (IS_ERR(sock)) { 599 kfree(gs); 600 return ERR_CAST(sock); 601 } 602 603 gs->sock = sock; 604 gs->refcnt = 1; 605 for (h = 0; h < VNI_HASH_SIZE; ++h) 606 INIT_HLIST_HEAD(&gs->vni_list[h]); 607 608 /* Initialize the geneve udp offloads structure */ 609 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 610 611 /* Mark socket as an encapsulation socket */ 612 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 613 tunnel_cfg.sk_user_data = gs; 614 tunnel_cfg.encap_type = 1; 615 tunnel_cfg.gro_receive = geneve_gro_receive; 616 tunnel_cfg.gro_complete = geneve_gro_complete; 617 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 618 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 619 tunnel_cfg.encap_destroy = NULL; 620 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 621 list_add(&gs->list, &gn->sock_list); 622 return gs; 623 } 624 625 static void __geneve_sock_release(struct geneve_sock *gs) 626 { 627 if (!gs || --gs->refcnt) 628 return; 629 630 list_del(&gs->list); 631 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 632 udp_tunnel_sock_release(gs->sock); 633 kfree_rcu(gs, rcu); 634 } 635 636 static void geneve_sock_release(struct geneve_dev *geneve) 637 { 638 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 639 #if IS_ENABLED(CONFIG_IPV6) 640 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 641 642 rcu_assign_pointer(geneve->sock6, NULL); 643 #endif 644 645 rcu_assign_pointer(geneve->sock4, NULL); 646 synchronize_net(); 647 648 __geneve_sock_release(gs4); 649 #if IS_ENABLED(CONFIG_IPV6) 650 __geneve_sock_release(gs6); 651 #endif 652 } 653 654 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 655 sa_family_t family, 656 __be16 dst_port) 657 { 658 struct geneve_sock *gs; 659 660 list_for_each_entry(gs, &gn->sock_list, list) { 661 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 662 geneve_get_sk_family(gs) == family) { 663 return gs; 664 } 665 } 666 return NULL; 667 } 668 669 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 670 { 671 struct net *net = geneve->net; 672 struct geneve_net *gn = net_generic(net, geneve_net_id); 673 struct geneve_dev_node *node; 674 struct geneve_sock *gs; 675 __u8 vni[3]; 676 __u32 hash; 677 678 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 679 if (gs) { 680 gs->refcnt++; 681 goto out; 682 } 683 684 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 685 geneve->cfg.use_udp6_rx_checksums); 686 if (IS_ERR(gs)) 687 return PTR_ERR(gs); 688 689 out: 690 gs->collect_md = geneve->cfg.collect_md; 691 #if IS_ENABLED(CONFIG_IPV6) 692 if (ipv6) { 693 rcu_assign_pointer(geneve->sock6, gs); 694 node = &geneve->hlist6; 695 } else 696 #endif 697 { 698 rcu_assign_pointer(geneve->sock4, gs); 699 node = &geneve->hlist4; 700 } 701 node->geneve = geneve; 702 703 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 704 hash = geneve_net_vni_hash(vni); 705 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 706 return 0; 707 } 708 709 static int geneve_open(struct net_device *dev) 710 { 711 struct geneve_dev *geneve = netdev_priv(dev); 712 bool metadata = geneve->cfg.collect_md; 713 bool ipv4, ipv6; 714 int ret = 0; 715 716 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 717 ipv4 = !ipv6 || metadata; 718 #if IS_ENABLED(CONFIG_IPV6) 719 if (ipv6) { 720 ret = geneve_sock_add(geneve, true); 721 if (ret < 0 && ret != -EAFNOSUPPORT) 722 ipv4 = false; 723 } 724 #endif 725 if (ipv4) 726 ret = geneve_sock_add(geneve, false); 727 if (ret < 0) 728 geneve_sock_release(geneve); 729 730 return ret; 731 } 732 733 static int geneve_stop(struct net_device *dev) 734 { 735 struct geneve_dev *geneve = netdev_priv(dev); 736 737 hlist_del_init_rcu(&geneve->hlist4.hlist); 738 #if IS_ENABLED(CONFIG_IPV6) 739 hlist_del_init_rcu(&geneve->hlist6.hlist); 740 #endif 741 geneve_sock_release(geneve); 742 return 0; 743 } 744 745 static void geneve_build_header(struct genevehdr *geneveh, 746 const struct ip_tunnel_info *info, 747 __be16 inner_proto) 748 { 749 geneveh->ver = GENEVE_VER; 750 geneveh->opt_len = info->options_len / 4; 751 geneveh->oam = test_bit(IP_TUNNEL_OAM_BIT, info->key.tun_flags); 752 geneveh->critical = test_bit(IP_TUNNEL_CRIT_OPT_BIT, 753 info->key.tun_flags); 754 geneveh->rsvd1 = 0; 755 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 756 geneveh->proto_type = inner_proto; 757 geneveh->rsvd2 = 0; 758 759 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags)) 760 ip_tunnel_info_opts_get(geneveh->options, info); 761 } 762 763 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 764 const struct ip_tunnel_info *info, 765 bool xnet, int ip_hdr_len, 766 bool inner_proto_inherit) 767 { 768 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 769 struct genevehdr *gnvh; 770 __be16 inner_proto; 771 int min_headroom; 772 int err; 773 774 skb_reset_mac_header(skb); 775 skb_scrub_packet(skb, xnet); 776 777 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 778 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 779 err = skb_cow_head(skb, min_headroom); 780 if (unlikely(err)) 781 goto free_dst; 782 783 err = udp_tunnel_handle_offloads(skb, udp_sum); 784 if (err) 785 goto free_dst; 786 787 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 788 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB); 789 geneve_build_header(gnvh, info, inner_proto); 790 skb_set_inner_protocol(skb, inner_proto); 791 return 0; 792 793 free_dst: 794 dst_release(dst); 795 return err; 796 } 797 798 static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev, 799 const struct ip_tunnel_info *info, 800 bool *use_cache) 801 { 802 struct geneve_dev *geneve = netdev_priv(dev); 803 u8 dsfield; 804 805 dsfield = info->key.tos; 806 if (dsfield == 1 && !geneve->cfg.collect_md) { 807 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 808 *use_cache = false; 809 } 810 811 return dsfield; 812 } 813 814 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 815 struct geneve_dev *geneve, 816 const struct ip_tunnel_info *info) 817 { 818 bool inner_proto_inherit = geneve->cfg.inner_proto_inherit; 819 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 820 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 821 const struct ip_tunnel_key *key = &info->key; 822 struct rtable *rt; 823 bool use_cache; 824 __u8 tos, ttl; 825 __be16 df = 0; 826 __be32 saddr; 827 __be16 sport; 828 int err; 829 830 if (!skb_vlan_inet_prepare(skb, inner_proto_inherit)) 831 return -EINVAL; 832 833 if (!gs4) 834 return -EIO; 835 836 use_cache = ip_tunnel_dst_cache_usable(skb, info); 837 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 838 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 839 840 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 841 &info->key, 842 sport, geneve->cfg.info.key.tp_dst, tos, 843 use_cache ? 844 (struct dst_cache *)&info->dst_cache : NULL); 845 if (IS_ERR(rt)) 846 return PTR_ERR(rt); 847 848 err = skb_tunnel_check_pmtu(skb, &rt->dst, 849 GENEVE_IPV4_HLEN + info->options_len, 850 netif_is_any_bridge_port(dev)); 851 if (err < 0) { 852 dst_release(&rt->dst); 853 return err; 854 } else if (err) { 855 struct ip_tunnel_info *info; 856 857 info = skb_tunnel_info(skb); 858 if (info) { 859 struct ip_tunnel_info *unclone; 860 861 unclone = skb_tunnel_info_unclone(skb); 862 if (unlikely(!unclone)) { 863 dst_release(&rt->dst); 864 return -ENOMEM; 865 } 866 867 unclone->key.u.ipv4.dst = saddr; 868 unclone->key.u.ipv4.src = info->key.u.ipv4.dst; 869 } 870 871 if (!pskb_may_pull(skb, ETH_HLEN)) { 872 dst_release(&rt->dst); 873 return -EINVAL; 874 } 875 876 skb->protocol = eth_type_trans(skb, geneve->dev); 877 __netif_rx(skb); 878 dst_release(&rt->dst); 879 return -EMSGSIZE; 880 } 881 882 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb); 883 if (geneve->cfg.collect_md) { 884 ttl = key->ttl; 885 886 df = test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags) ? 887 htons(IP_DF) : 0; 888 } else { 889 if (geneve->cfg.ttl_inherit) 890 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 891 else 892 ttl = key->ttl; 893 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 894 895 if (geneve->cfg.df == GENEVE_DF_SET) { 896 df = htons(IP_DF); 897 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 898 struct ethhdr *eth = eth_hdr(skb); 899 900 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 901 df = htons(IP_DF); 902 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 903 struct iphdr *iph = ip_hdr(skb); 904 905 if (iph->frag_off & htons(IP_DF)) 906 df = htons(IP_DF); 907 } 908 } 909 } 910 911 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr), 912 inner_proto_inherit); 913 if (unlikely(err)) 914 return err; 915 916 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst, 917 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 918 !net_eq(geneve->net, dev_net(geneve->dev)), 919 !test_bit(IP_TUNNEL_CSUM_BIT, 920 info->key.tun_flags)); 921 return 0; 922 } 923 924 #if IS_ENABLED(CONFIG_IPV6) 925 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 926 struct geneve_dev *geneve, 927 const struct ip_tunnel_info *info) 928 { 929 bool inner_proto_inherit = geneve->cfg.inner_proto_inherit; 930 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 931 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 932 const struct ip_tunnel_key *key = &info->key; 933 struct dst_entry *dst = NULL; 934 struct in6_addr saddr; 935 bool use_cache; 936 __u8 prio, ttl; 937 __be16 sport; 938 int err; 939 940 if (!skb_vlan_inet_prepare(skb, inner_proto_inherit)) 941 return -EINVAL; 942 943 if (!gs6) 944 return -EIO; 945 946 use_cache = ip_tunnel_dst_cache_usable(skb, info); 947 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 948 sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); 949 950 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 951 &saddr, key, sport, 952 geneve->cfg.info.key.tp_dst, prio, 953 use_cache ? 954 (struct dst_cache *)&info->dst_cache : NULL); 955 if (IS_ERR(dst)) 956 return PTR_ERR(dst); 957 958 err = skb_tunnel_check_pmtu(skb, dst, 959 GENEVE_IPV6_HLEN + info->options_len, 960 netif_is_any_bridge_port(dev)); 961 if (err < 0) { 962 dst_release(dst); 963 return err; 964 } else if (err) { 965 struct ip_tunnel_info *info = skb_tunnel_info(skb); 966 967 if (info) { 968 struct ip_tunnel_info *unclone; 969 970 unclone = skb_tunnel_info_unclone(skb); 971 if (unlikely(!unclone)) { 972 dst_release(dst); 973 return -ENOMEM; 974 } 975 976 unclone->key.u.ipv6.dst = saddr; 977 unclone->key.u.ipv6.src = info->key.u.ipv6.dst; 978 } 979 980 if (!pskb_may_pull(skb, ETH_HLEN)) { 981 dst_release(dst); 982 return -EINVAL; 983 } 984 985 skb->protocol = eth_type_trans(skb, geneve->dev); 986 __netif_rx(skb); 987 dst_release(dst); 988 return -EMSGSIZE; 989 } 990 991 prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb); 992 if (geneve->cfg.collect_md) { 993 ttl = key->ttl; 994 } else { 995 if (geneve->cfg.ttl_inherit) 996 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 997 else 998 ttl = key->ttl; 999 ttl = ttl ? : ip6_dst_hoplimit(dst); 1000 } 1001 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr), 1002 inner_proto_inherit); 1003 if (unlikely(err)) 1004 return err; 1005 1006 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1007 &saddr, &key->u.ipv6.dst, prio, ttl, 1008 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1009 !test_bit(IP_TUNNEL_CSUM_BIT, 1010 info->key.tun_flags)); 1011 return 0; 1012 } 1013 #endif 1014 1015 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1016 { 1017 struct geneve_dev *geneve = netdev_priv(dev); 1018 struct ip_tunnel_info *info = NULL; 1019 int err; 1020 1021 if (geneve->cfg.collect_md) { 1022 info = skb_tunnel_info(skb); 1023 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1024 netdev_dbg(dev, "no tunnel metadata\n"); 1025 dev_kfree_skb(skb); 1026 DEV_STATS_INC(dev, tx_dropped); 1027 return NETDEV_TX_OK; 1028 } 1029 } else { 1030 info = &geneve->cfg.info; 1031 } 1032 1033 rcu_read_lock(); 1034 #if IS_ENABLED(CONFIG_IPV6) 1035 if (info->mode & IP_TUNNEL_INFO_IPV6) 1036 err = geneve6_xmit_skb(skb, dev, geneve, info); 1037 else 1038 #endif 1039 err = geneve_xmit_skb(skb, dev, geneve, info); 1040 rcu_read_unlock(); 1041 1042 if (likely(!err)) 1043 return NETDEV_TX_OK; 1044 1045 if (err != -EMSGSIZE) 1046 dev_kfree_skb(skb); 1047 1048 if (err == -ELOOP) 1049 DEV_STATS_INC(dev, collisions); 1050 else if (err == -ENETUNREACH) 1051 DEV_STATS_INC(dev, tx_carrier_errors); 1052 1053 DEV_STATS_INC(dev, tx_errors); 1054 return NETDEV_TX_OK; 1055 } 1056 1057 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1058 { 1059 if (new_mtu > dev->max_mtu) 1060 new_mtu = dev->max_mtu; 1061 else if (new_mtu < dev->min_mtu) 1062 new_mtu = dev->min_mtu; 1063 1064 WRITE_ONCE(dev->mtu, new_mtu); 1065 return 0; 1066 } 1067 1068 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1069 { 1070 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1071 struct geneve_dev *geneve = netdev_priv(dev); 1072 __be16 sport; 1073 1074 if (ip_tunnel_info_af(info) == AF_INET) { 1075 struct rtable *rt; 1076 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1077 bool use_cache; 1078 __be32 saddr; 1079 u8 tos; 1080 1081 if (!gs4) 1082 return -EIO; 1083 1084 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1085 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 1086 sport = udp_flow_src_port(geneve->net, skb, 1087 1, USHRT_MAX, true); 1088 1089 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 1090 &info->key, 1091 sport, geneve->cfg.info.key.tp_dst, 1092 tos, 1093 use_cache ? &info->dst_cache : NULL); 1094 if (IS_ERR(rt)) 1095 return PTR_ERR(rt); 1096 1097 ip_rt_put(rt); 1098 info->key.u.ipv4.src = saddr; 1099 #if IS_ENABLED(CONFIG_IPV6) 1100 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1101 struct dst_entry *dst; 1102 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1103 struct in6_addr saddr; 1104 bool use_cache; 1105 u8 prio; 1106 1107 if (!gs6) 1108 return -EIO; 1109 1110 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1111 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 1112 sport = udp_flow_src_port(geneve->net, skb, 1113 1, USHRT_MAX, true); 1114 1115 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 1116 &saddr, &info->key, sport, 1117 geneve->cfg.info.key.tp_dst, prio, 1118 use_cache ? &info->dst_cache : NULL); 1119 if (IS_ERR(dst)) 1120 return PTR_ERR(dst); 1121 1122 dst_release(dst); 1123 info->key.u.ipv6.src = saddr; 1124 #endif 1125 } else { 1126 return -EINVAL; 1127 } 1128 1129 info->key.tp_src = sport; 1130 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1131 return 0; 1132 } 1133 1134 static const struct net_device_ops geneve_netdev_ops = { 1135 .ndo_init = geneve_init, 1136 .ndo_uninit = geneve_uninit, 1137 .ndo_open = geneve_open, 1138 .ndo_stop = geneve_stop, 1139 .ndo_start_xmit = geneve_xmit, 1140 .ndo_change_mtu = geneve_change_mtu, 1141 .ndo_validate_addr = eth_validate_addr, 1142 .ndo_set_mac_address = eth_mac_addr, 1143 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1144 }; 1145 1146 static void geneve_get_drvinfo(struct net_device *dev, 1147 struct ethtool_drvinfo *drvinfo) 1148 { 1149 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1150 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1151 } 1152 1153 static const struct ethtool_ops geneve_ethtool_ops = { 1154 .get_drvinfo = geneve_get_drvinfo, 1155 .get_link = ethtool_op_get_link, 1156 }; 1157 1158 /* Info for udev, that this is a virtual tunnel endpoint */ 1159 static const struct device_type geneve_type = { 1160 .name = "geneve", 1161 }; 1162 1163 /* Calls the ndo_udp_tunnel_add of the caller in order to 1164 * supply the listening GENEVE udp ports. Callers are expected 1165 * to implement the ndo_udp_tunnel_add. 1166 */ 1167 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1168 { 1169 struct net *net = dev_net(dev); 1170 struct geneve_net *gn = net_generic(net, geneve_net_id); 1171 struct geneve_sock *gs; 1172 1173 rcu_read_lock(); 1174 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1175 if (push) { 1176 udp_tunnel_push_rx_port(dev, gs->sock, 1177 UDP_TUNNEL_TYPE_GENEVE); 1178 } else { 1179 udp_tunnel_drop_rx_port(dev, gs->sock, 1180 UDP_TUNNEL_TYPE_GENEVE); 1181 } 1182 } 1183 rcu_read_unlock(); 1184 } 1185 1186 /* Initialize the device structure. */ 1187 static void geneve_setup(struct net_device *dev) 1188 { 1189 ether_setup(dev); 1190 1191 dev->netdev_ops = &geneve_netdev_ops; 1192 dev->ethtool_ops = &geneve_ethtool_ops; 1193 dev->needs_free_netdev = true; 1194 1195 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1196 1197 dev->features |= NETIF_F_LLTX; 1198 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1199 dev->features |= NETIF_F_RXCSUM; 1200 dev->features |= NETIF_F_GSO_SOFTWARE; 1201 1202 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1203 dev->hw_features |= NETIF_F_RXCSUM; 1204 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1205 1206 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 1207 /* MTU range: 68 - (something less than 65535) */ 1208 dev->min_mtu = ETH_MIN_MTU; 1209 /* The max_mtu calculation does not take account of GENEVE 1210 * options, to avoid excluding potentially valid 1211 * configurations. This will be further reduced by IPvX hdr size. 1212 */ 1213 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1214 1215 netif_keep_dst(dev); 1216 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1217 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1218 eth_hw_addr_random(dev); 1219 } 1220 1221 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1222 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, 1223 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1224 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1225 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1226 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1227 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1228 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1229 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1230 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1231 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1232 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1233 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1234 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1235 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1236 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, 1237 }; 1238 1239 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1240 struct netlink_ext_ack *extack) 1241 { 1242 if (tb[IFLA_ADDRESS]) { 1243 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1244 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1245 "Provided link layer address is not Ethernet"); 1246 return -EINVAL; 1247 } 1248 1249 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1250 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1251 "Provided Ethernet address is not unicast"); 1252 return -EADDRNOTAVAIL; 1253 } 1254 } 1255 1256 if (!data) { 1257 NL_SET_ERR_MSG(extack, 1258 "Not enough attributes provided to perform the operation"); 1259 return -EINVAL; 1260 } 1261 1262 if (data[IFLA_GENEVE_ID]) { 1263 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1264 1265 if (vni >= GENEVE_N_VID) { 1266 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1267 "Geneve ID must be lower than 16777216"); 1268 return -ERANGE; 1269 } 1270 } 1271 1272 if (data[IFLA_GENEVE_DF]) { 1273 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1274 1275 if (df < 0 || df > GENEVE_DF_MAX) { 1276 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1277 "Invalid DF attribute"); 1278 return -EINVAL; 1279 } 1280 } 1281 1282 return 0; 1283 } 1284 1285 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1286 const struct ip_tunnel_info *info, 1287 bool *tun_on_same_port, 1288 bool *tun_collect_md) 1289 { 1290 struct geneve_dev *geneve, *t = NULL; 1291 1292 *tun_on_same_port = false; 1293 *tun_collect_md = false; 1294 list_for_each_entry(geneve, &gn->geneve_list, next) { 1295 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1296 *tun_collect_md = geneve->cfg.collect_md; 1297 *tun_on_same_port = true; 1298 } 1299 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1300 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1301 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1302 t = geneve; 1303 } 1304 return t; 1305 } 1306 1307 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1308 { 1309 return !(info->key.tun_id || info->key.tos || 1310 !ip_tunnel_flags_empty(info->key.tun_flags) || 1311 info->key.ttl || info->key.label || info->key.tp_src || 1312 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1313 } 1314 1315 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1316 struct ip_tunnel_info *b) 1317 { 1318 if (ip_tunnel_info_af(a) == AF_INET) 1319 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1320 else 1321 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1322 } 1323 1324 static int geneve_configure(struct net *net, struct net_device *dev, 1325 struct netlink_ext_ack *extack, 1326 const struct geneve_config *cfg) 1327 { 1328 struct geneve_net *gn = net_generic(net, geneve_net_id); 1329 struct geneve_dev *t, *geneve = netdev_priv(dev); 1330 const struct ip_tunnel_info *info = &cfg->info; 1331 bool tun_collect_md, tun_on_same_port; 1332 int err, encap_len; 1333 1334 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1335 NL_SET_ERR_MSG(extack, 1336 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1337 return -EINVAL; 1338 } 1339 1340 geneve->net = net; 1341 geneve->dev = dev; 1342 1343 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1344 if (t) 1345 return -EBUSY; 1346 1347 /* make enough headroom for basic scenario */ 1348 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1349 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1350 encap_len += sizeof(struct iphdr); 1351 dev->max_mtu -= sizeof(struct iphdr); 1352 } else { 1353 encap_len += sizeof(struct ipv6hdr); 1354 dev->max_mtu -= sizeof(struct ipv6hdr); 1355 } 1356 dev->needed_headroom = encap_len + ETH_HLEN; 1357 1358 if (cfg->collect_md) { 1359 if (tun_on_same_port) { 1360 NL_SET_ERR_MSG(extack, 1361 "There can be only one externally controlled device on a destination port"); 1362 return -EPERM; 1363 } 1364 } else { 1365 if (tun_collect_md) { 1366 NL_SET_ERR_MSG(extack, 1367 "There already exists an externally controlled device on this destination port"); 1368 return -EPERM; 1369 } 1370 } 1371 1372 dst_cache_reset(&geneve->cfg.info.dst_cache); 1373 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1374 1375 if (geneve->cfg.inner_proto_inherit) { 1376 dev->header_ops = NULL; 1377 dev->type = ARPHRD_NONE; 1378 dev->hard_header_len = 0; 1379 dev->addr_len = 0; 1380 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1381 } 1382 1383 err = register_netdevice(dev); 1384 if (err) 1385 return err; 1386 1387 list_add(&geneve->next, &gn->geneve_list); 1388 return 0; 1389 } 1390 1391 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1392 { 1393 memset(info, 0, sizeof(*info)); 1394 info->key.tp_dst = htons(dst_port); 1395 } 1396 1397 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1398 struct netlink_ext_ack *extack, 1399 struct geneve_config *cfg, bool changelink) 1400 { 1401 struct ip_tunnel_info *info = &cfg->info; 1402 int attrtype; 1403 1404 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1405 NL_SET_ERR_MSG(extack, 1406 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1407 return -EINVAL; 1408 } 1409 1410 if (data[IFLA_GENEVE_REMOTE]) { 1411 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1412 attrtype = IFLA_GENEVE_REMOTE; 1413 goto change_notsup; 1414 } 1415 1416 info->key.u.ipv4.dst = 1417 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1418 1419 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1420 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1421 "Remote IPv4 address cannot be Multicast"); 1422 return -EINVAL; 1423 } 1424 } 1425 1426 if (data[IFLA_GENEVE_REMOTE6]) { 1427 #if IS_ENABLED(CONFIG_IPV6) 1428 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1429 attrtype = IFLA_GENEVE_REMOTE6; 1430 goto change_notsup; 1431 } 1432 1433 info->mode = IP_TUNNEL_INFO_IPV6; 1434 info->key.u.ipv6.dst = 1435 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1436 1437 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1438 IPV6_ADDR_LINKLOCAL) { 1439 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1440 "Remote IPv6 address cannot be link-local"); 1441 return -EINVAL; 1442 } 1443 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1444 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1445 "Remote IPv6 address cannot be Multicast"); 1446 return -EINVAL; 1447 } 1448 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1449 cfg->use_udp6_rx_checksums = true; 1450 #else 1451 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1452 "IPv6 support not enabled in the kernel"); 1453 return -EPFNOSUPPORT; 1454 #endif 1455 } 1456 1457 if (data[IFLA_GENEVE_ID]) { 1458 __u32 vni; 1459 __u8 tvni[3]; 1460 __be64 tunid; 1461 1462 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1463 tvni[0] = (vni & 0x00ff0000) >> 16; 1464 tvni[1] = (vni & 0x0000ff00) >> 8; 1465 tvni[2] = vni & 0x000000ff; 1466 1467 tunid = vni_to_tunnel_id(tvni); 1468 if (changelink && (tunid != info->key.tun_id)) { 1469 attrtype = IFLA_GENEVE_ID; 1470 goto change_notsup; 1471 } 1472 info->key.tun_id = tunid; 1473 } 1474 1475 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1476 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1477 cfg->ttl_inherit = true; 1478 else 1479 cfg->ttl_inherit = false; 1480 } else if (data[IFLA_GENEVE_TTL]) { 1481 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1482 cfg->ttl_inherit = false; 1483 } 1484 1485 if (data[IFLA_GENEVE_TOS]) 1486 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1487 1488 if (data[IFLA_GENEVE_DF]) 1489 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1490 1491 if (data[IFLA_GENEVE_LABEL]) { 1492 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1493 IPV6_FLOWLABEL_MASK; 1494 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1495 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1496 "Label attribute only applies for IPv6 Geneve devices"); 1497 return -EINVAL; 1498 } 1499 } 1500 1501 if (data[IFLA_GENEVE_PORT]) { 1502 if (changelink) { 1503 attrtype = IFLA_GENEVE_PORT; 1504 goto change_notsup; 1505 } 1506 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1507 } 1508 1509 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1510 if (changelink) { 1511 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1512 goto change_notsup; 1513 } 1514 cfg->collect_md = true; 1515 } 1516 1517 if (data[IFLA_GENEVE_UDP_CSUM]) { 1518 if (changelink) { 1519 attrtype = IFLA_GENEVE_UDP_CSUM; 1520 goto change_notsup; 1521 } 1522 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1523 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1524 } 1525 1526 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1527 #if IS_ENABLED(CONFIG_IPV6) 1528 if (changelink) { 1529 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1530 goto change_notsup; 1531 } 1532 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1533 __clear_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1534 #else 1535 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1536 "IPv6 support not enabled in the kernel"); 1537 return -EPFNOSUPPORT; 1538 #endif 1539 } 1540 1541 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1542 #if IS_ENABLED(CONFIG_IPV6) 1543 if (changelink) { 1544 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1545 goto change_notsup; 1546 } 1547 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1548 cfg->use_udp6_rx_checksums = false; 1549 #else 1550 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1551 "IPv6 support not enabled in the kernel"); 1552 return -EPFNOSUPPORT; 1553 #endif 1554 } 1555 1556 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { 1557 if (changelink) { 1558 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; 1559 goto change_notsup; 1560 } 1561 cfg->inner_proto_inherit = true; 1562 } 1563 1564 return 0; 1565 change_notsup: 1566 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1567 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported"); 1568 return -EOPNOTSUPP; 1569 } 1570 1571 static void geneve_link_config(struct net_device *dev, 1572 struct ip_tunnel_info *info, struct nlattr *tb[]) 1573 { 1574 struct geneve_dev *geneve = netdev_priv(dev); 1575 int ldev_mtu = 0; 1576 1577 if (tb[IFLA_MTU]) { 1578 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1579 return; 1580 } 1581 1582 switch (ip_tunnel_info_af(info)) { 1583 case AF_INET: { 1584 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1585 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1586 1587 if (!IS_ERR(rt) && rt->dst.dev) { 1588 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1589 ip_rt_put(rt); 1590 } 1591 break; 1592 } 1593 #if IS_ENABLED(CONFIG_IPV6) 1594 case AF_INET6: { 1595 struct rt6_info *rt; 1596 1597 if (!__in6_dev_get(dev)) 1598 break; 1599 1600 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1601 NULL, 0); 1602 1603 if (rt && rt->dst.dev) 1604 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1605 ip6_rt_put(rt); 1606 break; 1607 } 1608 #endif 1609 } 1610 1611 if (ldev_mtu <= 0) 1612 return; 1613 1614 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1615 } 1616 1617 static int geneve_newlink(struct net *net, struct net_device *dev, 1618 struct nlattr *tb[], struct nlattr *data[], 1619 struct netlink_ext_ack *extack) 1620 { 1621 struct geneve_config cfg = { 1622 .df = GENEVE_DF_UNSET, 1623 .use_udp6_rx_checksums = false, 1624 .ttl_inherit = false, 1625 .collect_md = false, 1626 }; 1627 int err; 1628 1629 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1630 err = geneve_nl2info(tb, data, extack, &cfg, false); 1631 if (err) 1632 return err; 1633 1634 err = geneve_configure(net, dev, extack, &cfg); 1635 if (err) 1636 return err; 1637 1638 geneve_link_config(dev, &cfg.info, tb); 1639 1640 return 0; 1641 } 1642 1643 /* Quiesces the geneve device data path for both TX and RX. 1644 * 1645 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1646 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1647 * to complete for the existing set of in-flight packets to be transmitted, 1648 * then we would have quiesced the transmit data path. All the future packets 1649 * will get dropped until we unquiesce the data path. 1650 * 1651 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1652 * if we set that to NULL under RCU and wait for synchronize_net() to 1653 * complete, then we would have quiesced the receive data path. 1654 */ 1655 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1656 struct geneve_sock **gs6) 1657 { 1658 *gs4 = rtnl_dereference(geneve->sock4); 1659 rcu_assign_pointer(geneve->sock4, NULL); 1660 if (*gs4) 1661 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1662 #if IS_ENABLED(CONFIG_IPV6) 1663 *gs6 = rtnl_dereference(geneve->sock6); 1664 rcu_assign_pointer(geneve->sock6, NULL); 1665 if (*gs6) 1666 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1667 #else 1668 *gs6 = NULL; 1669 #endif 1670 synchronize_net(); 1671 } 1672 1673 /* Resumes the geneve device data path for both TX and RX. */ 1674 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1675 struct geneve_sock __maybe_unused *gs6) 1676 { 1677 rcu_assign_pointer(geneve->sock4, gs4); 1678 if (gs4) 1679 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1680 #if IS_ENABLED(CONFIG_IPV6) 1681 rcu_assign_pointer(geneve->sock6, gs6); 1682 if (gs6) 1683 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1684 #endif 1685 synchronize_net(); 1686 } 1687 1688 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1689 struct nlattr *data[], 1690 struct netlink_ext_ack *extack) 1691 { 1692 struct geneve_dev *geneve = netdev_priv(dev); 1693 struct geneve_sock *gs4, *gs6; 1694 struct geneve_config cfg; 1695 int err; 1696 1697 /* If the geneve device is configured for metadata (or externally 1698 * controlled, for example, OVS), then nothing can be changed. 1699 */ 1700 if (geneve->cfg.collect_md) 1701 return -EOPNOTSUPP; 1702 1703 /* Start with the existing info. */ 1704 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1705 err = geneve_nl2info(tb, data, extack, &cfg, true); 1706 if (err) 1707 return err; 1708 1709 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1710 dst_cache_reset(&cfg.info.dst_cache); 1711 geneve_link_config(dev, &cfg.info, tb); 1712 } 1713 1714 geneve_quiesce(geneve, &gs4, &gs6); 1715 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1716 geneve_unquiesce(geneve, gs4, gs6); 1717 1718 return 0; 1719 } 1720 1721 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1722 { 1723 struct geneve_dev *geneve = netdev_priv(dev); 1724 1725 list_del(&geneve->next); 1726 unregister_netdevice_queue(dev, head); 1727 } 1728 1729 static size_t geneve_get_size(const struct net_device *dev) 1730 { 1731 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1732 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1733 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1734 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1735 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1736 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1737 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1738 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1739 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1740 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1741 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1742 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1743 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ 1744 0; 1745 } 1746 1747 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1748 { 1749 struct geneve_dev *geneve = netdev_priv(dev); 1750 struct ip_tunnel_info *info = &geneve->cfg.info; 1751 bool ttl_inherit = geneve->cfg.ttl_inherit; 1752 bool metadata = geneve->cfg.collect_md; 1753 __u8 tmp_vni[3]; 1754 __u32 vni; 1755 1756 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1757 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1758 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1759 goto nla_put_failure; 1760 1761 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1762 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1763 info->key.u.ipv4.dst)) 1764 goto nla_put_failure; 1765 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1766 test_bit(IP_TUNNEL_CSUM_BIT, 1767 info->key.tun_flags))) 1768 goto nla_put_failure; 1769 1770 #if IS_ENABLED(CONFIG_IPV6) 1771 } else if (!metadata) { 1772 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1773 &info->key.u.ipv6.dst)) 1774 goto nla_put_failure; 1775 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1776 !test_bit(IP_TUNNEL_CSUM_BIT, 1777 info->key.tun_flags))) 1778 goto nla_put_failure; 1779 #endif 1780 } 1781 1782 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1783 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1784 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1785 goto nla_put_failure; 1786 1787 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1788 goto nla_put_failure; 1789 1790 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1791 goto nla_put_failure; 1792 1793 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1794 goto nla_put_failure; 1795 1796 #if IS_ENABLED(CONFIG_IPV6) 1797 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1798 !geneve->cfg.use_udp6_rx_checksums)) 1799 goto nla_put_failure; 1800 #endif 1801 1802 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1803 goto nla_put_failure; 1804 1805 if (geneve->cfg.inner_proto_inherit && 1806 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) 1807 goto nla_put_failure; 1808 1809 return 0; 1810 1811 nla_put_failure: 1812 return -EMSGSIZE; 1813 } 1814 1815 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1816 .kind = "geneve", 1817 .maxtype = IFLA_GENEVE_MAX, 1818 .policy = geneve_policy, 1819 .priv_size = sizeof(struct geneve_dev), 1820 .setup = geneve_setup, 1821 .validate = geneve_validate, 1822 .newlink = geneve_newlink, 1823 .changelink = geneve_changelink, 1824 .dellink = geneve_dellink, 1825 .get_size = geneve_get_size, 1826 .fill_info = geneve_fill_info, 1827 }; 1828 1829 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1830 u8 name_assign_type, u16 dst_port) 1831 { 1832 struct nlattr *tb[IFLA_MAX + 1]; 1833 struct net_device *dev; 1834 LIST_HEAD(list_kill); 1835 int err; 1836 struct geneve_config cfg = { 1837 .df = GENEVE_DF_UNSET, 1838 .use_udp6_rx_checksums = true, 1839 .ttl_inherit = false, 1840 .collect_md = true, 1841 }; 1842 1843 memset(tb, 0, sizeof(tb)); 1844 dev = rtnl_create_link(net, name, name_assign_type, 1845 &geneve_link_ops, tb, NULL); 1846 if (IS_ERR(dev)) 1847 return dev; 1848 1849 init_tnl_info(&cfg.info, dst_port); 1850 err = geneve_configure(net, dev, NULL, &cfg); 1851 if (err) { 1852 free_netdev(dev); 1853 return ERR_PTR(err); 1854 } 1855 1856 /* openvswitch users expect packet sizes to be unrestricted, 1857 * so set the largest MTU we can. 1858 */ 1859 err = geneve_change_mtu(dev, IP_MAX_MTU); 1860 if (err) 1861 goto err; 1862 1863 err = rtnl_configure_link(dev, NULL, 0, NULL); 1864 if (err < 0) 1865 goto err; 1866 1867 return dev; 1868 err: 1869 geneve_dellink(dev, &list_kill); 1870 unregister_netdevice_many(&list_kill); 1871 return ERR_PTR(err); 1872 } 1873 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1874 1875 static int geneve_netdevice_event(struct notifier_block *unused, 1876 unsigned long event, void *ptr) 1877 { 1878 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1879 1880 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1881 geneve_offload_rx_ports(dev, true); 1882 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 1883 geneve_offload_rx_ports(dev, false); 1884 1885 return NOTIFY_DONE; 1886 } 1887 1888 static struct notifier_block geneve_notifier_block __read_mostly = { 1889 .notifier_call = geneve_netdevice_event, 1890 }; 1891 1892 static __net_init int geneve_init_net(struct net *net) 1893 { 1894 struct geneve_net *gn = net_generic(net, geneve_net_id); 1895 1896 INIT_LIST_HEAD(&gn->geneve_list); 1897 INIT_LIST_HEAD(&gn->sock_list); 1898 return 0; 1899 } 1900 1901 static void geneve_destroy_tunnels(struct net *net, struct list_head *head) 1902 { 1903 struct geneve_net *gn = net_generic(net, geneve_net_id); 1904 struct geneve_dev *geneve, *next; 1905 struct net_device *dev, *aux; 1906 1907 /* gather any geneve devices that were moved into this ns */ 1908 for_each_netdev_safe(net, dev, aux) 1909 if (dev->rtnl_link_ops == &geneve_link_ops) 1910 unregister_netdevice_queue(dev, head); 1911 1912 /* now gather any other geneve devices that were created in this ns */ 1913 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { 1914 /* If geneve->dev is in the same netns, it was already added 1915 * to the list by the previous loop. 1916 */ 1917 if (!net_eq(dev_net(geneve->dev), net)) 1918 unregister_netdevice_queue(geneve->dev, head); 1919 } 1920 } 1921 1922 static void __net_exit geneve_exit_batch_rtnl(struct list_head *net_list, 1923 struct list_head *dev_to_kill) 1924 { 1925 struct net *net; 1926 1927 list_for_each_entry(net, net_list, exit_list) 1928 geneve_destroy_tunnels(net, dev_to_kill); 1929 } 1930 1931 static void __net_exit geneve_exit_net(struct net *net) 1932 { 1933 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1934 1935 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1936 } 1937 1938 static struct pernet_operations geneve_net_ops = { 1939 .init = geneve_init_net, 1940 .exit_batch_rtnl = geneve_exit_batch_rtnl, 1941 .exit = geneve_exit_net, 1942 .id = &geneve_net_id, 1943 .size = sizeof(struct geneve_net), 1944 }; 1945 1946 static int __init geneve_init_module(void) 1947 { 1948 int rc; 1949 1950 rc = register_pernet_subsys(&geneve_net_ops); 1951 if (rc) 1952 goto out1; 1953 1954 rc = register_netdevice_notifier(&geneve_notifier_block); 1955 if (rc) 1956 goto out2; 1957 1958 rc = rtnl_link_register(&geneve_link_ops); 1959 if (rc) 1960 goto out3; 1961 1962 return 0; 1963 out3: 1964 unregister_netdevice_notifier(&geneve_notifier_block); 1965 out2: 1966 unregister_pernet_subsys(&geneve_net_ops); 1967 out1: 1968 return rc; 1969 } 1970 late_initcall(geneve_init_module); 1971 1972 static void __exit geneve_cleanup_module(void) 1973 { 1974 rtnl_link_unregister(&geneve_link_ops); 1975 unregister_netdevice_notifier(&geneve_notifier_block); 1976 unregister_pernet_subsys(&geneve_net_ops); 1977 } 1978 module_exit(geneve_cleanup_module); 1979 1980 MODULE_LICENSE("GPL"); 1981 MODULE_VERSION(GENEVE_NETDEV_VER); 1982 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 1983 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 1984 MODULE_ALIAS_RTNL_LINK("geneve"); 1985