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/netdev_lock.h> 22 #include <net/protocol.h> 23 24 #define GENEVE_NETDEV_VER "0.6" 25 26 #define GENEVE_N_VID (1u << 24) 27 #define GENEVE_VID_MASK (GENEVE_N_VID - 1) 28 29 #define VNI_HASH_BITS 10 30 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) 31 32 static bool log_ecn_error = true; 33 module_param(log_ecn_error, bool, 0644); 34 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 35 36 #define GENEVE_VER 0 37 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) 38 #define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN) 39 #define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN) 40 41 /* per-network namespace private data for this module */ 42 struct geneve_net { 43 struct list_head geneve_list; 44 /* sock_list is protected by rtnl lock */ 45 struct list_head sock_list; 46 }; 47 48 static unsigned int geneve_net_id; 49 50 struct geneve_dev_node { 51 struct hlist_node hlist; 52 struct geneve_dev *geneve; 53 }; 54 55 struct geneve_config { 56 struct ip_tunnel_info info; 57 bool collect_md; 58 bool use_udp6_rx_checksums; 59 bool ttl_inherit; 60 enum ifla_geneve_df df; 61 bool inner_proto_inherit; 62 u16 port_min; 63 u16 port_max; 64 }; 65 66 /* Pseudo network device */ 67 struct geneve_dev { 68 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ 69 #if IS_ENABLED(CONFIG_IPV6) 70 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ 71 #endif 72 struct net *net; /* netns for packet i/o */ 73 struct net_device *dev; /* netdev for geneve tunnel */ 74 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 75 #if IS_ENABLED(CONFIG_IPV6) 76 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ 77 #endif 78 struct list_head next; /* geneve's per namespace list */ 79 struct gro_cells gro_cells; 80 struct geneve_config cfg; 81 }; 82 83 struct geneve_sock { 84 bool collect_md; 85 struct list_head list; 86 struct socket *sock; 87 struct rcu_head rcu; 88 int refcnt; 89 struct hlist_head vni_list[VNI_HASH_SIZE]; 90 }; 91 92 static inline __u32 geneve_net_vni_hash(u8 vni[3]) 93 { 94 __u32 vnid; 95 96 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 97 return hash_32(vnid, VNI_HASH_BITS); 98 } 99 100 static __be64 vni_to_tunnel_id(const __u8 *vni) 101 { 102 #ifdef __BIG_ENDIAN 103 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 104 #else 105 return (__force __be64)(((__force u64)vni[0] << 40) | 106 ((__force u64)vni[1] << 48) | 107 ((__force u64)vni[2] << 56)); 108 #endif 109 } 110 111 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 112 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 113 { 114 #ifdef __BIG_ENDIAN 115 vni[0] = (__force __u8)(tun_id >> 16); 116 vni[1] = (__force __u8)(tun_id >> 8); 117 vni[2] = (__force __u8)tun_id; 118 #else 119 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 120 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 121 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 122 #endif 123 } 124 125 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) 126 { 127 return !memcmp(vni, &tun_id[5], 3); 128 } 129 130 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 131 { 132 return gs->sock->sk->sk_family; 133 } 134 135 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 136 __be32 addr, u8 vni[]) 137 { 138 struct hlist_head *vni_list_head; 139 struct geneve_dev_node *node; 140 __u32 hash; 141 142 /* Find the device for this VNI */ 143 hash = geneve_net_vni_hash(vni); 144 vni_list_head = &gs->vni_list[hash]; 145 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 146 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 147 addr == node->geneve->cfg.info.key.u.ipv4.dst) 148 return node->geneve; 149 } 150 return NULL; 151 } 152 153 #if IS_ENABLED(CONFIG_IPV6) 154 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 155 struct in6_addr addr6, u8 vni[]) 156 { 157 struct hlist_head *vni_list_head; 158 struct geneve_dev_node *node; 159 __u32 hash; 160 161 /* Find the device for this VNI */ 162 hash = geneve_net_vni_hash(vni); 163 vni_list_head = &gs->vni_list[hash]; 164 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 165 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 166 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst)) 167 return node->geneve; 168 } 169 return NULL; 170 } 171 #endif 172 173 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 174 { 175 return (struct genevehdr *)(udp_hdr(skb) + 1); 176 } 177 178 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 179 struct sk_buff *skb) 180 { 181 static u8 zero_vni[3]; 182 u8 *vni; 183 184 if (geneve_get_sk_family(gs) == AF_INET) { 185 struct iphdr *iph; 186 __be32 addr; 187 188 iph = ip_hdr(skb); /* outer IP header... */ 189 190 if (gs->collect_md) { 191 vni = zero_vni; 192 addr = 0; 193 } else { 194 vni = geneve_hdr(skb)->vni; 195 addr = iph->saddr; 196 } 197 198 return geneve_lookup(gs, addr, vni); 199 #if IS_ENABLED(CONFIG_IPV6) 200 } else if (geneve_get_sk_family(gs) == AF_INET6) { 201 static struct in6_addr zero_addr6; 202 struct ipv6hdr *ip6h; 203 struct in6_addr addr6; 204 205 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 206 207 if (gs->collect_md) { 208 vni = zero_vni; 209 addr6 = zero_addr6; 210 } else { 211 vni = geneve_hdr(skb)->vni; 212 addr6 = ip6h->saddr; 213 } 214 215 return geneve6_lookup(gs, addr6, vni); 216 #endif 217 } 218 return NULL; 219 } 220 221 /* geneve receive/decap routine */ 222 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 223 struct sk_buff *skb) 224 { 225 struct genevehdr *gnvh = geneve_hdr(skb); 226 struct metadata_dst *tun_dst = NULL; 227 unsigned int len; 228 int nh, err = 0; 229 void *oiph; 230 231 if (ip_tunnel_collect_metadata() || gs->collect_md) { 232 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 233 234 __set_bit(IP_TUNNEL_KEY_BIT, flags); 235 __assign_bit(IP_TUNNEL_OAM_BIT, flags, gnvh->oam); 236 __assign_bit(IP_TUNNEL_CRIT_OPT_BIT, flags, gnvh->critical); 237 238 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 239 vni_to_tunnel_id(gnvh->vni), 240 gnvh->opt_len * 4); 241 if (!tun_dst) { 242 dev_dstats_rx_dropped(geneve->dev); 243 goto drop; 244 } 245 /* Update tunnel dst according to Geneve options. */ 246 ip_tunnel_flags_zero(flags); 247 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, flags); 248 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 249 gnvh->options, gnvh->opt_len * 4, 250 flags); 251 } else { 252 /* Drop packets w/ critical options, 253 * since we don't support any... 254 */ 255 if (gnvh->critical) { 256 DEV_STATS_INC(geneve->dev, rx_frame_errors); 257 DEV_STATS_INC(geneve->dev, rx_errors); 258 goto drop; 259 } 260 } 261 262 if (tun_dst) 263 skb_dst_set(skb, &tun_dst->dst); 264 265 if (gnvh->proto_type == htons(ETH_P_TEB)) { 266 skb_reset_mac_header(skb); 267 skb->protocol = eth_type_trans(skb, geneve->dev); 268 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 269 270 /* Ignore packet loops (and multicast echo) */ 271 if (ether_addr_equal(eth_hdr(skb)->h_source, 272 geneve->dev->dev_addr)) { 273 DEV_STATS_INC(geneve->dev, rx_errors); 274 goto drop; 275 } 276 } else { 277 skb_reset_mac_header(skb); 278 skb->dev = geneve->dev; 279 skb->pkt_type = PACKET_HOST; 280 } 281 282 /* Save offset of outer header relative to skb->head, 283 * because we are going to reset the network header to the inner header 284 * and might change skb->head. 285 */ 286 nh = skb_network_header(skb) - skb->head; 287 288 skb_reset_network_header(skb); 289 290 if (!pskb_inet_may_pull(skb)) { 291 DEV_STATS_INC(geneve->dev, rx_length_errors); 292 DEV_STATS_INC(geneve->dev, rx_errors); 293 goto drop; 294 } 295 296 /* Get the outer header. */ 297 oiph = skb->head + nh; 298 299 if (geneve_get_sk_family(gs) == AF_INET) 300 err = IP_ECN_decapsulate(oiph, skb); 301 #if IS_ENABLED(CONFIG_IPV6) 302 else 303 err = IP6_ECN_decapsulate(oiph, skb); 304 #endif 305 306 if (unlikely(err)) { 307 if (log_ecn_error) { 308 if (geneve_get_sk_family(gs) == AF_INET) 309 net_info_ratelimited("non-ECT from %pI4 " 310 "with TOS=%#x\n", 311 &((struct iphdr *)oiph)->saddr, 312 ((struct iphdr *)oiph)->tos); 313 #if IS_ENABLED(CONFIG_IPV6) 314 else 315 net_info_ratelimited("non-ECT from %pI6\n", 316 &((struct ipv6hdr *)oiph)->saddr); 317 #endif 318 } 319 if (err > 1) { 320 DEV_STATS_INC(geneve->dev, rx_frame_errors); 321 DEV_STATS_INC(geneve->dev, rx_errors); 322 goto drop; 323 } 324 } 325 326 len = skb->len; 327 err = gro_cells_receive(&geneve->gro_cells, skb); 328 if (likely(err == NET_RX_SUCCESS)) 329 dev_dstats_rx_add(geneve->dev, len); 330 331 return; 332 drop: 333 /* Consume bad packet */ 334 kfree_skb(skb); 335 } 336 337 /* Setup stats when device is created */ 338 static int geneve_init(struct net_device *dev) 339 { 340 struct geneve_dev *geneve = netdev_priv(dev); 341 int err; 342 343 err = gro_cells_init(&geneve->gro_cells, dev); 344 if (err) 345 return err; 346 347 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 348 if (err) { 349 gro_cells_destroy(&geneve->gro_cells); 350 return err; 351 } 352 netdev_lockdep_set_classes(dev); 353 return 0; 354 } 355 356 static void geneve_uninit(struct net_device *dev) 357 { 358 struct geneve_dev *geneve = netdev_priv(dev); 359 360 dst_cache_destroy(&geneve->cfg.info.dst_cache); 361 gro_cells_destroy(&geneve->gro_cells); 362 } 363 364 /* Callback from net/ipv4/udp.c to receive packets */ 365 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 366 { 367 struct genevehdr *geneveh; 368 struct geneve_dev *geneve; 369 struct geneve_sock *gs; 370 __be16 inner_proto; 371 int opts_len; 372 373 /* Need UDP and Geneve header to be present */ 374 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 375 goto drop; 376 377 /* Return packets with reserved bits set */ 378 geneveh = geneve_hdr(skb); 379 if (unlikely(geneveh->ver != GENEVE_VER)) 380 goto drop; 381 382 gs = rcu_dereference_sk_user_data(sk); 383 if (!gs) 384 goto drop; 385 386 geneve = geneve_lookup_skb(gs, skb); 387 if (!geneve) 388 goto drop; 389 390 inner_proto = geneveh->proto_type; 391 392 if (unlikely((!geneve->cfg.inner_proto_inherit && 393 inner_proto != htons(ETH_P_TEB)))) { 394 dev_dstats_rx_dropped(geneve->dev); 395 goto drop; 396 } 397 398 opts_len = geneveh->opt_len * 4; 399 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto, 400 !net_eq(geneve->net, dev_net(geneve->dev)))) { 401 dev_dstats_rx_dropped(geneve->dev); 402 goto drop; 403 } 404 405 geneve_rx(geneve, gs, skb); 406 return 0; 407 408 drop: 409 /* Consume bad packet */ 410 kfree_skb(skb); 411 return 0; 412 } 413 414 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 415 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 416 { 417 struct genevehdr *geneveh; 418 struct geneve_sock *gs; 419 u8 zero_vni[3] = { 0 }; 420 u8 *vni = zero_vni; 421 422 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 423 return -EINVAL; 424 425 geneveh = geneve_hdr(skb); 426 if (geneveh->ver != GENEVE_VER) 427 return -EINVAL; 428 429 if (geneveh->proto_type != htons(ETH_P_TEB)) 430 return -EINVAL; 431 432 gs = rcu_dereference_sk_user_data(sk); 433 if (!gs) 434 return -ENOENT; 435 436 if (geneve_get_sk_family(gs) == AF_INET) { 437 struct iphdr *iph = ip_hdr(skb); 438 __be32 addr4 = 0; 439 440 if (!gs->collect_md) { 441 vni = geneve_hdr(skb)->vni; 442 addr4 = iph->daddr; 443 } 444 445 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 446 } 447 448 #if IS_ENABLED(CONFIG_IPV6) 449 if (geneve_get_sk_family(gs) == AF_INET6) { 450 struct ipv6hdr *ip6h = ipv6_hdr(skb); 451 struct in6_addr addr6; 452 453 memset(&addr6, 0, sizeof(struct in6_addr)); 454 455 if (!gs->collect_md) { 456 vni = geneve_hdr(skb)->vni; 457 addr6 = ip6h->daddr; 458 } 459 460 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 461 } 462 #endif 463 464 return -EPFNOSUPPORT; 465 } 466 467 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 468 __be16 port, bool ipv6_rx_csum) 469 { 470 struct socket *sock; 471 struct udp_port_cfg udp_conf; 472 int err; 473 474 memset(&udp_conf, 0, sizeof(udp_conf)); 475 476 if (ipv6) { 477 udp_conf.family = AF_INET6; 478 udp_conf.ipv6_v6only = 1; 479 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 480 } else { 481 udp_conf.family = AF_INET; 482 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 483 } 484 485 udp_conf.local_udp_port = port; 486 487 /* Open UDP socket */ 488 err = udp_sock_create(net, &udp_conf, &sock); 489 if (err < 0) 490 return ERR_PTR(err); 491 492 udp_allow_gso(sock->sk); 493 return sock; 494 } 495 496 static int geneve_hlen(struct genevehdr *gh) 497 { 498 return sizeof(*gh) + gh->opt_len * 4; 499 } 500 501 static struct sk_buff *geneve_gro_receive(struct sock *sk, 502 struct list_head *head, 503 struct sk_buff *skb) 504 { 505 struct sk_buff *pp = NULL; 506 struct sk_buff *p; 507 struct genevehdr *gh, *gh2; 508 unsigned int hlen, gh_len, off_gnv; 509 const struct packet_offload *ptype; 510 __be16 type; 511 int flush = 1; 512 513 off_gnv = skb_gro_offset(skb); 514 hlen = off_gnv + sizeof(*gh); 515 gh = skb_gro_header(skb, hlen, off_gnv); 516 if (unlikely(!gh)) 517 goto out; 518 519 if (gh->ver != GENEVE_VER || gh->oam) 520 goto out; 521 gh_len = geneve_hlen(gh); 522 523 hlen = off_gnv + gh_len; 524 if (!skb_gro_may_pull(skb, hlen)) { 525 gh = skb_gro_header_slow(skb, hlen, off_gnv); 526 if (unlikely(!gh)) 527 goto out; 528 } 529 530 list_for_each_entry(p, head, list) { 531 if (!NAPI_GRO_CB(p)->same_flow) 532 continue; 533 534 gh2 = (struct genevehdr *)(p->data + off_gnv); 535 if (gh->opt_len != gh2->opt_len || 536 memcmp(gh, gh2, gh_len)) { 537 NAPI_GRO_CB(p)->same_flow = 0; 538 continue; 539 } 540 } 541 542 skb_gro_pull(skb, gh_len); 543 skb_gro_postpull_rcsum(skb, gh, gh_len); 544 type = gh->proto_type; 545 if (likely(type == htons(ETH_P_TEB))) 546 return call_gro_receive(eth_gro_receive, head, skb); 547 548 ptype = gro_find_receive_by_type(type); 549 if (!ptype) 550 goto out; 551 552 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 553 flush = 0; 554 555 out: 556 skb_gro_flush_final(skb, pp, flush); 557 558 return pp; 559 } 560 561 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 562 int nhoff) 563 { 564 struct genevehdr *gh; 565 struct packet_offload *ptype; 566 __be16 type; 567 int gh_len; 568 int err = -ENOSYS; 569 570 gh = (struct genevehdr *)(skb->data + nhoff); 571 gh_len = geneve_hlen(gh); 572 type = gh->proto_type; 573 574 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */ 575 if (likely(type == htons(ETH_P_TEB))) 576 return eth_gro_complete(skb, nhoff + gh_len); 577 578 ptype = gro_find_complete_by_type(type); 579 if (ptype) 580 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 581 582 skb_set_inner_mac_header(skb, nhoff + gh_len); 583 584 return err; 585 } 586 587 /* Create new listen socket if needed */ 588 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 589 bool ipv6, bool ipv6_rx_csum) 590 { 591 struct geneve_net *gn = net_generic(net, geneve_net_id); 592 struct geneve_sock *gs; 593 struct socket *sock; 594 struct udp_tunnel_sock_cfg tunnel_cfg; 595 int h; 596 597 gs = kzalloc(sizeof(*gs), GFP_KERNEL); 598 if (!gs) 599 return ERR_PTR(-ENOMEM); 600 601 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 602 if (IS_ERR(sock)) { 603 kfree(gs); 604 return ERR_CAST(sock); 605 } 606 607 gs->sock = sock; 608 gs->refcnt = 1; 609 for (h = 0; h < VNI_HASH_SIZE; ++h) 610 INIT_HLIST_HEAD(&gs->vni_list[h]); 611 612 /* Initialize the geneve udp offloads structure */ 613 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 614 615 /* Mark socket as an encapsulation socket */ 616 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 617 tunnel_cfg.sk_user_data = gs; 618 tunnel_cfg.encap_type = 1; 619 tunnel_cfg.gro_receive = geneve_gro_receive; 620 tunnel_cfg.gro_complete = geneve_gro_complete; 621 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 622 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 623 tunnel_cfg.encap_destroy = NULL; 624 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 625 list_add(&gs->list, &gn->sock_list); 626 return gs; 627 } 628 629 static void __geneve_sock_release(struct geneve_sock *gs) 630 { 631 if (!gs || --gs->refcnt) 632 return; 633 634 list_del(&gs->list); 635 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 636 udp_tunnel_sock_release(gs->sock); 637 kfree_rcu(gs, rcu); 638 } 639 640 static void geneve_sock_release(struct geneve_dev *geneve) 641 { 642 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 643 #if IS_ENABLED(CONFIG_IPV6) 644 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 645 646 rcu_assign_pointer(geneve->sock6, NULL); 647 #endif 648 649 rcu_assign_pointer(geneve->sock4, NULL); 650 synchronize_net(); 651 652 __geneve_sock_release(gs4); 653 #if IS_ENABLED(CONFIG_IPV6) 654 __geneve_sock_release(gs6); 655 #endif 656 } 657 658 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 659 sa_family_t family, 660 __be16 dst_port) 661 { 662 struct geneve_sock *gs; 663 664 list_for_each_entry(gs, &gn->sock_list, list) { 665 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 666 geneve_get_sk_family(gs) == family) { 667 return gs; 668 } 669 } 670 return NULL; 671 } 672 673 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 674 { 675 struct net *net = geneve->net; 676 struct geneve_net *gn = net_generic(net, geneve_net_id); 677 struct geneve_dev_node *node; 678 struct geneve_sock *gs; 679 __u8 vni[3]; 680 __u32 hash; 681 682 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->cfg.info.key.tp_dst); 683 if (gs) { 684 gs->refcnt++; 685 goto out; 686 } 687 688 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 689 geneve->cfg.use_udp6_rx_checksums); 690 if (IS_ERR(gs)) 691 return PTR_ERR(gs); 692 693 out: 694 gs->collect_md = geneve->cfg.collect_md; 695 #if IS_ENABLED(CONFIG_IPV6) 696 if (ipv6) { 697 rcu_assign_pointer(geneve->sock6, gs); 698 node = &geneve->hlist6; 699 } else 700 #endif 701 { 702 rcu_assign_pointer(geneve->sock4, gs); 703 node = &geneve->hlist4; 704 } 705 node->geneve = geneve; 706 707 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 708 hash = geneve_net_vni_hash(vni); 709 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 710 return 0; 711 } 712 713 static int geneve_open(struct net_device *dev) 714 { 715 struct geneve_dev *geneve = netdev_priv(dev); 716 bool metadata = geneve->cfg.collect_md; 717 bool ipv4, ipv6; 718 int ret = 0; 719 720 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 721 ipv4 = !ipv6 || metadata; 722 #if IS_ENABLED(CONFIG_IPV6) 723 if (ipv6) { 724 ret = geneve_sock_add(geneve, true); 725 if (ret < 0 && ret != -EAFNOSUPPORT) 726 ipv4 = false; 727 } 728 #endif 729 if (ipv4) 730 ret = geneve_sock_add(geneve, false); 731 if (ret < 0) 732 geneve_sock_release(geneve); 733 734 return ret; 735 } 736 737 static int geneve_stop(struct net_device *dev) 738 { 739 struct geneve_dev *geneve = netdev_priv(dev); 740 741 hlist_del_init_rcu(&geneve->hlist4.hlist); 742 #if IS_ENABLED(CONFIG_IPV6) 743 hlist_del_init_rcu(&geneve->hlist6.hlist); 744 #endif 745 geneve_sock_release(geneve); 746 return 0; 747 } 748 749 static void geneve_build_header(struct genevehdr *geneveh, 750 const struct ip_tunnel_info *info, 751 __be16 inner_proto) 752 { 753 geneveh->ver = GENEVE_VER; 754 geneveh->opt_len = info->options_len / 4; 755 geneveh->oam = test_bit(IP_TUNNEL_OAM_BIT, info->key.tun_flags); 756 geneveh->critical = test_bit(IP_TUNNEL_CRIT_OPT_BIT, 757 info->key.tun_flags); 758 geneveh->rsvd1 = 0; 759 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 760 geneveh->proto_type = inner_proto; 761 geneveh->rsvd2 = 0; 762 763 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags)) 764 ip_tunnel_info_opts_get(geneveh->options, info); 765 } 766 767 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 768 const struct ip_tunnel_info *info, 769 bool xnet, int ip_hdr_len, 770 bool inner_proto_inherit) 771 { 772 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 773 struct genevehdr *gnvh; 774 __be16 inner_proto; 775 int min_headroom; 776 int err; 777 778 skb_reset_mac_header(skb); 779 skb_scrub_packet(skb, xnet); 780 781 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 782 GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; 783 err = skb_cow_head(skb, min_headroom); 784 if (unlikely(err)) 785 goto free_dst; 786 787 err = udp_tunnel_handle_offloads(skb, udp_sum); 788 if (err) 789 goto free_dst; 790 791 gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); 792 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB); 793 geneve_build_header(gnvh, info, inner_proto); 794 skb_set_inner_protocol(skb, inner_proto); 795 return 0; 796 797 free_dst: 798 dst_release(dst); 799 return err; 800 } 801 802 static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev, 803 const struct ip_tunnel_info *info, 804 bool *use_cache) 805 { 806 struct geneve_dev *geneve = netdev_priv(dev); 807 u8 dsfield; 808 809 dsfield = info->key.tos; 810 if (dsfield == 1 && !geneve->cfg.collect_md) { 811 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 812 *use_cache = false; 813 } 814 815 return dsfield; 816 } 817 818 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 819 struct geneve_dev *geneve, 820 const struct ip_tunnel_info *info) 821 { 822 bool inner_proto_inherit = geneve->cfg.inner_proto_inherit; 823 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 824 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 825 const struct ip_tunnel_key *key = &info->key; 826 struct rtable *rt; 827 bool use_cache; 828 __u8 tos, ttl; 829 __be16 df = 0; 830 __be32 saddr; 831 __be16 sport; 832 int err; 833 834 if (skb_vlan_inet_prepare(skb, inner_proto_inherit)) 835 return -EINVAL; 836 837 if (!gs4) 838 return -EIO; 839 840 use_cache = ip_tunnel_dst_cache_usable(skb, info); 841 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 842 sport = udp_flow_src_port(geneve->net, skb, 843 geneve->cfg.port_min, 844 geneve->cfg.port_max, true); 845 846 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 847 &info->key, 848 sport, geneve->cfg.info.key.tp_dst, tos, 849 use_cache ? 850 (struct dst_cache *)&info->dst_cache : NULL); 851 if (IS_ERR(rt)) 852 return PTR_ERR(rt); 853 854 err = skb_tunnel_check_pmtu(skb, &rt->dst, 855 GENEVE_IPV4_HLEN + info->options_len, 856 netif_is_any_bridge_port(dev)); 857 if (err < 0) { 858 dst_release(&rt->dst); 859 return err; 860 } else if (err) { 861 struct ip_tunnel_info *info; 862 863 info = skb_tunnel_info(skb); 864 if (info) { 865 struct ip_tunnel_info *unclone; 866 867 unclone = skb_tunnel_info_unclone(skb); 868 if (unlikely(!unclone)) { 869 dst_release(&rt->dst); 870 return -ENOMEM; 871 } 872 873 unclone->key.u.ipv4.dst = saddr; 874 unclone->key.u.ipv4.src = info->key.u.ipv4.dst; 875 } 876 877 if (!pskb_may_pull(skb, ETH_HLEN)) { 878 dst_release(&rt->dst); 879 return -EINVAL; 880 } 881 882 skb->protocol = eth_type_trans(skb, geneve->dev); 883 __netif_rx(skb); 884 dst_release(&rt->dst); 885 return -EMSGSIZE; 886 } 887 888 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb); 889 if (geneve->cfg.collect_md) { 890 ttl = key->ttl; 891 892 df = test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags) ? 893 htons(IP_DF) : 0; 894 } else { 895 if (geneve->cfg.ttl_inherit) 896 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 897 else 898 ttl = key->ttl; 899 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 900 901 if (geneve->cfg.df == GENEVE_DF_SET) { 902 df = htons(IP_DF); 903 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 904 struct ethhdr *eth = skb_eth_hdr(skb); 905 906 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 907 df = htons(IP_DF); 908 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 909 struct iphdr *iph = ip_hdr(skb); 910 911 if (iph->frag_off & htons(IP_DF)) 912 df = htons(IP_DF); 913 } 914 } 915 } 916 917 err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr), 918 inner_proto_inherit); 919 if (unlikely(err)) 920 return err; 921 922 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst, 923 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 924 !net_eq(geneve->net, dev_net(geneve->dev)), 925 !test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags), 926 0); 927 return 0; 928 } 929 930 #if IS_ENABLED(CONFIG_IPV6) 931 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 932 struct geneve_dev *geneve, 933 const struct ip_tunnel_info *info) 934 { 935 bool inner_proto_inherit = geneve->cfg.inner_proto_inherit; 936 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 937 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 938 const struct ip_tunnel_key *key = &info->key; 939 struct dst_entry *dst = NULL; 940 struct in6_addr saddr; 941 bool use_cache; 942 __u8 prio, ttl; 943 __be16 sport; 944 int err; 945 946 if (skb_vlan_inet_prepare(skb, inner_proto_inherit)) 947 return -EINVAL; 948 949 if (!gs6) 950 return -EIO; 951 952 use_cache = ip_tunnel_dst_cache_usable(skb, info); 953 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 954 sport = udp_flow_src_port(geneve->net, skb, 955 geneve->cfg.port_min, 956 geneve->cfg.port_max, true); 957 958 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 959 &saddr, key, sport, 960 geneve->cfg.info.key.tp_dst, prio, 961 use_cache ? 962 (struct dst_cache *)&info->dst_cache : NULL); 963 if (IS_ERR(dst)) 964 return PTR_ERR(dst); 965 966 err = skb_tunnel_check_pmtu(skb, dst, 967 GENEVE_IPV6_HLEN + info->options_len, 968 netif_is_any_bridge_port(dev)); 969 if (err < 0) { 970 dst_release(dst); 971 return err; 972 } else if (err) { 973 struct ip_tunnel_info *info = skb_tunnel_info(skb); 974 975 if (info) { 976 struct ip_tunnel_info *unclone; 977 978 unclone = skb_tunnel_info_unclone(skb); 979 if (unlikely(!unclone)) { 980 dst_release(dst); 981 return -ENOMEM; 982 } 983 984 unclone->key.u.ipv6.dst = saddr; 985 unclone->key.u.ipv6.src = info->key.u.ipv6.dst; 986 } 987 988 if (!pskb_may_pull(skb, ETH_HLEN)) { 989 dst_release(dst); 990 return -EINVAL; 991 } 992 993 skb->protocol = eth_type_trans(skb, geneve->dev); 994 __netif_rx(skb); 995 dst_release(dst); 996 return -EMSGSIZE; 997 } 998 999 prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb); 1000 if (geneve->cfg.collect_md) { 1001 ttl = key->ttl; 1002 } else { 1003 if (geneve->cfg.ttl_inherit) 1004 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1005 else 1006 ttl = key->ttl; 1007 ttl = ttl ? : ip6_dst_hoplimit(dst); 1008 } 1009 err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr), 1010 inner_proto_inherit); 1011 if (unlikely(err)) 1012 return err; 1013 1014 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1015 &saddr, &key->u.ipv6.dst, prio, ttl, 1016 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1017 !test_bit(IP_TUNNEL_CSUM_BIT, 1018 info->key.tun_flags), 1019 0); 1020 return 0; 1021 } 1022 #endif 1023 1024 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1025 { 1026 struct geneve_dev *geneve = netdev_priv(dev); 1027 struct ip_tunnel_info *info = NULL; 1028 int err; 1029 1030 if (geneve->cfg.collect_md) { 1031 info = skb_tunnel_info(skb); 1032 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1033 netdev_dbg(dev, "no tunnel metadata\n"); 1034 dev_kfree_skb(skb); 1035 dev_dstats_tx_dropped(dev); 1036 return NETDEV_TX_OK; 1037 } 1038 } else { 1039 info = &geneve->cfg.info; 1040 } 1041 1042 rcu_read_lock(); 1043 #if IS_ENABLED(CONFIG_IPV6) 1044 if (info->mode & IP_TUNNEL_INFO_IPV6) 1045 err = geneve6_xmit_skb(skb, dev, geneve, info); 1046 else 1047 #endif 1048 err = geneve_xmit_skb(skb, dev, geneve, info); 1049 rcu_read_unlock(); 1050 1051 if (likely(!err)) 1052 return NETDEV_TX_OK; 1053 1054 if (err != -EMSGSIZE) 1055 dev_kfree_skb(skb); 1056 1057 if (err == -ELOOP) 1058 DEV_STATS_INC(dev, collisions); 1059 else if (err == -ENETUNREACH) 1060 DEV_STATS_INC(dev, tx_carrier_errors); 1061 1062 DEV_STATS_INC(dev, tx_errors); 1063 return NETDEV_TX_OK; 1064 } 1065 1066 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1067 { 1068 if (new_mtu > dev->max_mtu) 1069 new_mtu = dev->max_mtu; 1070 else if (new_mtu < dev->min_mtu) 1071 new_mtu = dev->min_mtu; 1072 1073 WRITE_ONCE(dev->mtu, new_mtu); 1074 return 0; 1075 } 1076 1077 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1078 { 1079 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1080 struct geneve_dev *geneve = netdev_priv(dev); 1081 __be16 sport; 1082 1083 if (ip_tunnel_info_af(info) == AF_INET) { 1084 struct rtable *rt; 1085 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1086 bool use_cache; 1087 __be32 saddr; 1088 u8 tos; 1089 1090 if (!gs4) 1091 return -EIO; 1092 1093 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1094 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 1095 sport = udp_flow_src_port(geneve->net, skb, 1096 geneve->cfg.port_min, 1097 geneve->cfg.port_max, true); 1098 1099 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 1100 &info->key, 1101 sport, geneve->cfg.info.key.tp_dst, 1102 tos, 1103 use_cache ? &info->dst_cache : NULL); 1104 if (IS_ERR(rt)) 1105 return PTR_ERR(rt); 1106 1107 ip_rt_put(rt); 1108 info->key.u.ipv4.src = saddr; 1109 #if IS_ENABLED(CONFIG_IPV6) 1110 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1111 struct dst_entry *dst; 1112 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1113 struct in6_addr saddr; 1114 bool use_cache; 1115 u8 prio; 1116 1117 if (!gs6) 1118 return -EIO; 1119 1120 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1121 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 1122 sport = udp_flow_src_port(geneve->net, skb, 1123 geneve->cfg.port_min, 1124 geneve->cfg.port_max, true); 1125 1126 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 1127 &saddr, &info->key, sport, 1128 geneve->cfg.info.key.tp_dst, prio, 1129 use_cache ? &info->dst_cache : NULL); 1130 if (IS_ERR(dst)) 1131 return PTR_ERR(dst); 1132 1133 dst_release(dst); 1134 info->key.u.ipv6.src = saddr; 1135 #endif 1136 } else { 1137 return -EINVAL; 1138 } 1139 1140 info->key.tp_src = sport; 1141 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1142 return 0; 1143 } 1144 1145 static const struct net_device_ops geneve_netdev_ops = { 1146 .ndo_init = geneve_init, 1147 .ndo_uninit = geneve_uninit, 1148 .ndo_open = geneve_open, 1149 .ndo_stop = geneve_stop, 1150 .ndo_start_xmit = geneve_xmit, 1151 .ndo_change_mtu = geneve_change_mtu, 1152 .ndo_validate_addr = eth_validate_addr, 1153 .ndo_set_mac_address = eth_mac_addr, 1154 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1155 }; 1156 1157 static void geneve_get_drvinfo(struct net_device *dev, 1158 struct ethtool_drvinfo *drvinfo) 1159 { 1160 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1161 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1162 } 1163 1164 static const struct ethtool_ops geneve_ethtool_ops = { 1165 .get_drvinfo = geneve_get_drvinfo, 1166 .get_link = ethtool_op_get_link, 1167 }; 1168 1169 /* Info for udev, that this is a virtual tunnel endpoint */ 1170 static const struct device_type geneve_type = { 1171 .name = "geneve", 1172 }; 1173 1174 /* Calls the ndo_udp_tunnel_add of the caller in order to 1175 * supply the listening GENEVE udp ports. Callers are expected 1176 * to implement the ndo_udp_tunnel_add. 1177 */ 1178 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1179 { 1180 struct net *net = dev_net(dev); 1181 struct geneve_net *gn = net_generic(net, geneve_net_id); 1182 struct geneve_sock *gs; 1183 1184 ASSERT_RTNL(); 1185 1186 list_for_each_entry(gs, &gn->sock_list, list) { 1187 if (push) { 1188 udp_tunnel_push_rx_port(dev, gs->sock, 1189 UDP_TUNNEL_TYPE_GENEVE); 1190 } else { 1191 udp_tunnel_drop_rx_port(dev, gs->sock, 1192 UDP_TUNNEL_TYPE_GENEVE); 1193 } 1194 } 1195 } 1196 1197 /* Initialize the device structure. */ 1198 static void geneve_setup(struct net_device *dev) 1199 { 1200 ether_setup(dev); 1201 1202 dev->netdev_ops = &geneve_netdev_ops; 1203 dev->ethtool_ops = &geneve_ethtool_ops; 1204 dev->needs_free_netdev = true; 1205 1206 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1207 1208 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1209 dev->features |= NETIF_F_RXCSUM; 1210 dev->features |= NETIF_F_GSO_SOFTWARE; 1211 1212 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1213 dev->hw_features |= NETIF_F_RXCSUM; 1214 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1215 1216 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; 1217 /* MTU range: 68 - (something less than 65535) */ 1218 dev->min_mtu = ETH_MIN_MTU; 1219 /* The max_mtu calculation does not take account of GENEVE 1220 * options, to avoid excluding potentially valid 1221 * configurations. This will be further reduced by IPvX hdr size. 1222 */ 1223 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1224 1225 netif_keep_dst(dev); 1226 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1227 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1228 dev->lltx = true; 1229 eth_hw_addr_random(dev); 1230 } 1231 1232 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1233 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, 1234 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1235 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1236 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1237 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1238 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1239 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1240 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1241 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1242 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1243 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1244 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1245 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1246 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1247 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, 1248 [IFLA_GENEVE_PORT_RANGE] = NLA_POLICY_EXACT_LEN(sizeof(struct ifla_geneve_port_range)), 1249 }; 1250 1251 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1252 struct netlink_ext_ack *extack) 1253 { 1254 if (tb[IFLA_ADDRESS]) { 1255 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1256 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1257 "Provided link layer address is not Ethernet"); 1258 return -EINVAL; 1259 } 1260 1261 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1262 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1263 "Provided Ethernet address is not unicast"); 1264 return -EADDRNOTAVAIL; 1265 } 1266 } 1267 1268 if (!data) { 1269 NL_SET_ERR_MSG(extack, 1270 "Not enough attributes provided to perform the operation"); 1271 return -EINVAL; 1272 } 1273 1274 if (data[IFLA_GENEVE_ID]) { 1275 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1276 1277 if (vni >= GENEVE_N_VID) { 1278 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1279 "Geneve ID must be lower than 16777216"); 1280 return -ERANGE; 1281 } 1282 } 1283 1284 if (data[IFLA_GENEVE_DF]) { 1285 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1286 1287 if (df < 0 || df > GENEVE_DF_MAX) { 1288 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1289 "Invalid DF attribute"); 1290 return -EINVAL; 1291 } 1292 } 1293 1294 if (data[IFLA_GENEVE_PORT_RANGE]) { 1295 const struct ifla_geneve_port_range *p; 1296 1297 p = nla_data(data[IFLA_GENEVE_PORT_RANGE]); 1298 if (ntohs(p->high) < ntohs(p->low)) { 1299 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_PORT_RANGE], 1300 "Invalid source port range"); 1301 return -EINVAL; 1302 } 1303 } 1304 1305 return 0; 1306 } 1307 1308 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1309 const struct ip_tunnel_info *info, 1310 bool *tun_on_same_port, 1311 bool *tun_collect_md) 1312 { 1313 struct geneve_dev *geneve, *t = NULL; 1314 1315 *tun_on_same_port = false; 1316 *tun_collect_md = false; 1317 list_for_each_entry(geneve, &gn->geneve_list, next) { 1318 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1319 *tun_collect_md = geneve->cfg.collect_md; 1320 *tun_on_same_port = true; 1321 } 1322 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1323 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1324 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1325 t = geneve; 1326 } 1327 return t; 1328 } 1329 1330 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1331 { 1332 return !(info->key.tun_id || info->key.tos || 1333 !ip_tunnel_flags_empty(info->key.tun_flags) || 1334 info->key.ttl || info->key.label || info->key.tp_src || 1335 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1336 } 1337 1338 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1339 struct ip_tunnel_info *b) 1340 { 1341 if (ip_tunnel_info_af(a) == AF_INET) 1342 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1343 else 1344 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1345 } 1346 1347 static int geneve_configure(struct net *net, struct net_device *dev, 1348 struct netlink_ext_ack *extack, 1349 const struct geneve_config *cfg) 1350 { 1351 struct geneve_net *gn = net_generic(net, geneve_net_id); 1352 struct geneve_dev *t, *geneve = netdev_priv(dev); 1353 const struct ip_tunnel_info *info = &cfg->info; 1354 bool tun_collect_md, tun_on_same_port; 1355 int err, encap_len; 1356 1357 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1358 NL_SET_ERR_MSG(extack, 1359 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1360 return -EINVAL; 1361 } 1362 1363 geneve->net = net; 1364 geneve->dev = dev; 1365 1366 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1367 if (t) 1368 return -EBUSY; 1369 1370 /* make enough headroom for basic scenario */ 1371 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1372 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1373 encap_len += sizeof(struct iphdr); 1374 dev->max_mtu -= sizeof(struct iphdr); 1375 } else { 1376 encap_len += sizeof(struct ipv6hdr); 1377 dev->max_mtu -= sizeof(struct ipv6hdr); 1378 } 1379 dev->needed_headroom = encap_len + ETH_HLEN; 1380 1381 if (cfg->collect_md) { 1382 if (tun_on_same_port) { 1383 NL_SET_ERR_MSG(extack, 1384 "There can be only one externally controlled device on a destination port"); 1385 return -EPERM; 1386 } 1387 } else { 1388 if (tun_collect_md) { 1389 NL_SET_ERR_MSG(extack, 1390 "There already exists an externally controlled device on this destination port"); 1391 return -EPERM; 1392 } 1393 } 1394 1395 dst_cache_reset(&geneve->cfg.info.dst_cache); 1396 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1397 1398 if (geneve->cfg.inner_proto_inherit) { 1399 dev->header_ops = NULL; 1400 dev->type = ARPHRD_NONE; 1401 dev->hard_header_len = 0; 1402 dev->addr_len = 0; 1403 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1404 } 1405 1406 err = register_netdevice(dev); 1407 if (err) 1408 return err; 1409 1410 list_add(&geneve->next, &gn->geneve_list); 1411 return 0; 1412 } 1413 1414 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1415 { 1416 memset(info, 0, sizeof(*info)); 1417 info->key.tp_dst = htons(dst_port); 1418 } 1419 1420 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1421 struct netlink_ext_ack *extack, 1422 struct geneve_config *cfg, bool changelink) 1423 { 1424 struct ip_tunnel_info *info = &cfg->info; 1425 int attrtype; 1426 1427 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1428 NL_SET_ERR_MSG(extack, 1429 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1430 return -EINVAL; 1431 } 1432 1433 if (data[IFLA_GENEVE_REMOTE]) { 1434 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1435 attrtype = IFLA_GENEVE_REMOTE; 1436 goto change_notsup; 1437 } 1438 1439 info->key.u.ipv4.dst = 1440 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1441 1442 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1443 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1444 "Remote IPv4 address cannot be Multicast"); 1445 return -EINVAL; 1446 } 1447 } 1448 1449 if (data[IFLA_GENEVE_REMOTE6]) { 1450 #if IS_ENABLED(CONFIG_IPV6) 1451 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1452 attrtype = IFLA_GENEVE_REMOTE6; 1453 goto change_notsup; 1454 } 1455 1456 info->mode = IP_TUNNEL_INFO_IPV6; 1457 info->key.u.ipv6.dst = 1458 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1459 1460 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1461 IPV6_ADDR_LINKLOCAL) { 1462 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1463 "Remote IPv6 address cannot be link-local"); 1464 return -EINVAL; 1465 } 1466 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1467 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1468 "Remote IPv6 address cannot be Multicast"); 1469 return -EINVAL; 1470 } 1471 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1472 cfg->use_udp6_rx_checksums = true; 1473 #else 1474 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1475 "IPv6 support not enabled in the kernel"); 1476 return -EPFNOSUPPORT; 1477 #endif 1478 } 1479 1480 if (data[IFLA_GENEVE_ID]) { 1481 __u32 vni; 1482 __u8 tvni[3]; 1483 __be64 tunid; 1484 1485 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1486 tvni[0] = (vni & 0x00ff0000) >> 16; 1487 tvni[1] = (vni & 0x0000ff00) >> 8; 1488 tvni[2] = vni & 0x000000ff; 1489 1490 tunid = vni_to_tunnel_id(tvni); 1491 if (changelink && (tunid != info->key.tun_id)) { 1492 attrtype = IFLA_GENEVE_ID; 1493 goto change_notsup; 1494 } 1495 info->key.tun_id = tunid; 1496 } 1497 1498 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1499 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1500 cfg->ttl_inherit = true; 1501 else 1502 cfg->ttl_inherit = false; 1503 } else if (data[IFLA_GENEVE_TTL]) { 1504 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1505 cfg->ttl_inherit = false; 1506 } 1507 1508 if (data[IFLA_GENEVE_TOS]) 1509 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1510 1511 if (data[IFLA_GENEVE_DF]) 1512 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1513 1514 if (data[IFLA_GENEVE_LABEL]) { 1515 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1516 IPV6_FLOWLABEL_MASK; 1517 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1518 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1519 "Label attribute only applies for IPv6 Geneve devices"); 1520 return -EINVAL; 1521 } 1522 } 1523 1524 if (data[IFLA_GENEVE_PORT]) { 1525 if (changelink) { 1526 attrtype = IFLA_GENEVE_PORT; 1527 goto change_notsup; 1528 } 1529 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1530 } 1531 1532 if (data[IFLA_GENEVE_PORT_RANGE]) { 1533 const struct ifla_geneve_port_range *p; 1534 1535 if (changelink) { 1536 attrtype = IFLA_GENEVE_PORT_RANGE; 1537 goto change_notsup; 1538 } 1539 p = nla_data(data[IFLA_GENEVE_PORT_RANGE]); 1540 cfg->port_min = ntohs(p->low); 1541 cfg->port_max = ntohs(p->high); 1542 } 1543 1544 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1545 if (changelink) { 1546 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1547 goto change_notsup; 1548 } 1549 cfg->collect_md = true; 1550 } 1551 1552 if (data[IFLA_GENEVE_UDP_CSUM]) { 1553 if (changelink) { 1554 attrtype = IFLA_GENEVE_UDP_CSUM; 1555 goto change_notsup; 1556 } 1557 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1558 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1559 } 1560 1561 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1562 #if IS_ENABLED(CONFIG_IPV6) 1563 if (changelink) { 1564 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1565 goto change_notsup; 1566 } 1567 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1568 __clear_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1569 #else 1570 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1571 "IPv6 support not enabled in the kernel"); 1572 return -EPFNOSUPPORT; 1573 #endif 1574 } 1575 1576 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1577 #if IS_ENABLED(CONFIG_IPV6) 1578 if (changelink) { 1579 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1580 goto change_notsup; 1581 } 1582 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1583 cfg->use_udp6_rx_checksums = false; 1584 #else 1585 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1586 "IPv6 support not enabled in the kernel"); 1587 return -EPFNOSUPPORT; 1588 #endif 1589 } 1590 1591 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { 1592 if (changelink) { 1593 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; 1594 goto change_notsup; 1595 } 1596 cfg->inner_proto_inherit = true; 1597 } 1598 1599 return 0; 1600 change_notsup: 1601 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1602 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported"); 1603 return -EOPNOTSUPP; 1604 } 1605 1606 static void geneve_link_config(struct net_device *dev, 1607 struct ip_tunnel_info *info, struct nlattr *tb[]) 1608 { 1609 struct geneve_dev *geneve = netdev_priv(dev); 1610 int ldev_mtu = 0; 1611 1612 if (tb[IFLA_MTU]) { 1613 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1614 return; 1615 } 1616 1617 switch (ip_tunnel_info_af(info)) { 1618 case AF_INET: { 1619 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1620 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1621 1622 if (!IS_ERR(rt) && rt->dst.dev) { 1623 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1624 ip_rt_put(rt); 1625 } 1626 break; 1627 } 1628 #if IS_ENABLED(CONFIG_IPV6) 1629 case AF_INET6: { 1630 struct rt6_info *rt; 1631 1632 if (!__in6_dev_get(dev)) 1633 break; 1634 1635 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1636 NULL, 0); 1637 1638 if (rt && rt->dst.dev) 1639 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1640 ip6_rt_put(rt); 1641 break; 1642 } 1643 #endif 1644 } 1645 1646 if (ldev_mtu <= 0) 1647 return; 1648 1649 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1650 } 1651 1652 static int geneve_newlink(struct net_device *dev, 1653 struct rtnl_newlink_params *params, 1654 struct netlink_ext_ack *extack) 1655 { 1656 struct net *link_net = rtnl_newlink_link_net(params); 1657 struct nlattr **data = params->data; 1658 struct nlattr **tb = params->tb; 1659 struct geneve_config cfg = { 1660 .df = GENEVE_DF_UNSET, 1661 .use_udp6_rx_checksums = false, 1662 .ttl_inherit = false, 1663 .collect_md = false, 1664 .port_min = 1, 1665 .port_max = USHRT_MAX, 1666 }; 1667 int err; 1668 1669 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1670 err = geneve_nl2info(tb, data, extack, &cfg, false); 1671 if (err) 1672 return err; 1673 1674 err = geneve_configure(link_net, dev, extack, &cfg); 1675 if (err) 1676 return err; 1677 1678 geneve_link_config(dev, &cfg.info, tb); 1679 1680 return 0; 1681 } 1682 1683 /* Quiesces the geneve device data path for both TX and RX. 1684 * 1685 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1686 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1687 * to complete for the existing set of in-flight packets to be transmitted, 1688 * then we would have quiesced the transmit data path. All the future packets 1689 * will get dropped until we unquiesce the data path. 1690 * 1691 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1692 * if we set that to NULL under RCU and wait for synchronize_net() to 1693 * complete, then we would have quiesced the receive data path. 1694 */ 1695 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1696 struct geneve_sock **gs6) 1697 { 1698 *gs4 = rtnl_dereference(geneve->sock4); 1699 rcu_assign_pointer(geneve->sock4, NULL); 1700 if (*gs4) 1701 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1702 #if IS_ENABLED(CONFIG_IPV6) 1703 *gs6 = rtnl_dereference(geneve->sock6); 1704 rcu_assign_pointer(geneve->sock6, NULL); 1705 if (*gs6) 1706 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1707 #else 1708 *gs6 = NULL; 1709 #endif 1710 synchronize_net(); 1711 } 1712 1713 /* Resumes the geneve device data path for both TX and RX. */ 1714 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1715 struct geneve_sock __maybe_unused *gs6) 1716 { 1717 rcu_assign_pointer(geneve->sock4, gs4); 1718 if (gs4) 1719 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1720 #if IS_ENABLED(CONFIG_IPV6) 1721 rcu_assign_pointer(geneve->sock6, gs6); 1722 if (gs6) 1723 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1724 #endif 1725 synchronize_net(); 1726 } 1727 1728 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1729 struct nlattr *data[], 1730 struct netlink_ext_ack *extack) 1731 { 1732 struct geneve_dev *geneve = netdev_priv(dev); 1733 struct geneve_sock *gs4, *gs6; 1734 struct geneve_config cfg; 1735 int err; 1736 1737 /* If the geneve device is configured for metadata (or externally 1738 * controlled, for example, OVS), then nothing can be changed. 1739 */ 1740 if (geneve->cfg.collect_md) 1741 return -EOPNOTSUPP; 1742 1743 /* Start with the existing info. */ 1744 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1745 err = geneve_nl2info(tb, data, extack, &cfg, true); 1746 if (err) 1747 return err; 1748 1749 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1750 dst_cache_reset(&cfg.info.dst_cache); 1751 geneve_link_config(dev, &cfg.info, tb); 1752 } 1753 1754 geneve_quiesce(geneve, &gs4, &gs6); 1755 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1756 geneve_unquiesce(geneve, gs4, gs6); 1757 1758 return 0; 1759 } 1760 1761 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1762 { 1763 struct geneve_dev *geneve = netdev_priv(dev); 1764 1765 list_del(&geneve->next); 1766 unregister_netdevice_queue(dev, head); 1767 } 1768 1769 static size_t geneve_get_size(const struct net_device *dev) 1770 { 1771 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1772 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1773 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1774 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1775 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1776 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1777 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1778 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1779 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1780 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1781 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1782 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1783 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ 1784 nla_total_size(sizeof(struct ifla_geneve_port_range)) + /* IFLA_GENEVE_PORT_RANGE */ 1785 0; 1786 } 1787 1788 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1789 { 1790 struct geneve_dev *geneve = netdev_priv(dev); 1791 struct ip_tunnel_info *info = &geneve->cfg.info; 1792 bool ttl_inherit = geneve->cfg.ttl_inherit; 1793 bool metadata = geneve->cfg.collect_md; 1794 struct ifla_geneve_port_range ports = { 1795 .low = htons(geneve->cfg.port_min), 1796 .high = htons(geneve->cfg.port_max), 1797 }; 1798 __u8 tmp_vni[3]; 1799 __u32 vni; 1800 1801 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1802 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1803 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1804 goto nla_put_failure; 1805 1806 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1807 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1808 info->key.u.ipv4.dst)) 1809 goto nla_put_failure; 1810 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1811 test_bit(IP_TUNNEL_CSUM_BIT, 1812 info->key.tun_flags))) 1813 goto nla_put_failure; 1814 1815 #if IS_ENABLED(CONFIG_IPV6) 1816 } else if (!metadata) { 1817 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1818 &info->key.u.ipv6.dst)) 1819 goto nla_put_failure; 1820 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1821 !test_bit(IP_TUNNEL_CSUM_BIT, 1822 info->key.tun_flags))) 1823 goto nla_put_failure; 1824 #endif 1825 } 1826 1827 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1828 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1829 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1830 goto nla_put_failure; 1831 1832 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1833 goto nla_put_failure; 1834 1835 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1836 goto nla_put_failure; 1837 1838 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1839 goto nla_put_failure; 1840 1841 #if IS_ENABLED(CONFIG_IPV6) 1842 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1843 !geneve->cfg.use_udp6_rx_checksums)) 1844 goto nla_put_failure; 1845 #endif 1846 1847 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1848 goto nla_put_failure; 1849 1850 if (geneve->cfg.inner_proto_inherit && 1851 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) 1852 goto nla_put_failure; 1853 1854 if (nla_put(skb, IFLA_GENEVE_PORT_RANGE, sizeof(ports), &ports)) 1855 goto nla_put_failure; 1856 1857 return 0; 1858 1859 nla_put_failure: 1860 return -EMSGSIZE; 1861 } 1862 1863 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1864 .kind = "geneve", 1865 .maxtype = IFLA_GENEVE_MAX, 1866 .policy = geneve_policy, 1867 .priv_size = sizeof(struct geneve_dev), 1868 .setup = geneve_setup, 1869 .validate = geneve_validate, 1870 .newlink = geneve_newlink, 1871 .changelink = geneve_changelink, 1872 .dellink = geneve_dellink, 1873 .get_size = geneve_get_size, 1874 .fill_info = geneve_fill_info, 1875 }; 1876 1877 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1878 u8 name_assign_type, u16 dst_port) 1879 { 1880 struct nlattr *tb[IFLA_MAX + 1]; 1881 struct net_device *dev; 1882 LIST_HEAD(list_kill); 1883 int err; 1884 struct geneve_config cfg = { 1885 .df = GENEVE_DF_UNSET, 1886 .use_udp6_rx_checksums = true, 1887 .ttl_inherit = false, 1888 .collect_md = true, 1889 .port_min = 1, 1890 .port_max = USHRT_MAX, 1891 }; 1892 1893 memset(tb, 0, sizeof(tb)); 1894 dev = rtnl_create_link(net, name, name_assign_type, 1895 &geneve_link_ops, tb, NULL); 1896 if (IS_ERR(dev)) 1897 return dev; 1898 1899 init_tnl_info(&cfg.info, dst_port); 1900 err = geneve_configure(net, dev, NULL, &cfg); 1901 if (err) { 1902 free_netdev(dev); 1903 return ERR_PTR(err); 1904 } 1905 1906 /* openvswitch users expect packet sizes to be unrestricted, 1907 * so set the largest MTU we can. 1908 */ 1909 err = geneve_change_mtu(dev, IP_MAX_MTU); 1910 if (err) 1911 goto err; 1912 1913 err = rtnl_configure_link(dev, NULL, 0, NULL); 1914 if (err < 0) 1915 goto err; 1916 1917 return dev; 1918 err: 1919 geneve_dellink(dev, &list_kill); 1920 unregister_netdevice_many(&list_kill); 1921 return ERR_PTR(err); 1922 } 1923 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1924 1925 static int geneve_netdevice_event(struct notifier_block *unused, 1926 unsigned long event, void *ptr) 1927 { 1928 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1929 1930 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1931 geneve_offload_rx_ports(dev, true); 1932 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 1933 geneve_offload_rx_ports(dev, false); 1934 1935 return NOTIFY_DONE; 1936 } 1937 1938 static struct notifier_block geneve_notifier_block __read_mostly = { 1939 .notifier_call = geneve_netdevice_event, 1940 }; 1941 1942 static __net_init int geneve_init_net(struct net *net) 1943 { 1944 struct geneve_net *gn = net_generic(net, geneve_net_id); 1945 1946 INIT_LIST_HEAD(&gn->geneve_list); 1947 INIT_LIST_HEAD(&gn->sock_list); 1948 return 0; 1949 } 1950 1951 static void __net_exit geneve_exit_rtnl_net(struct net *net, 1952 struct list_head *dev_to_kill) 1953 { 1954 struct geneve_net *gn = net_generic(net, geneve_net_id); 1955 struct geneve_dev *geneve, *next; 1956 1957 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) 1958 geneve_dellink(geneve->dev, dev_to_kill); 1959 } 1960 1961 static void __net_exit geneve_exit_net(struct net *net) 1962 { 1963 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1964 1965 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1966 } 1967 1968 static struct pernet_operations geneve_net_ops = { 1969 .init = geneve_init_net, 1970 .exit_rtnl = geneve_exit_rtnl_net, 1971 .exit = geneve_exit_net, 1972 .id = &geneve_net_id, 1973 .size = sizeof(struct geneve_net), 1974 }; 1975 1976 static int __init geneve_init_module(void) 1977 { 1978 int rc; 1979 1980 rc = register_pernet_subsys(&geneve_net_ops); 1981 if (rc) 1982 goto out1; 1983 1984 rc = register_netdevice_notifier(&geneve_notifier_block); 1985 if (rc) 1986 goto out2; 1987 1988 rc = rtnl_link_register(&geneve_link_ops); 1989 if (rc) 1990 goto out3; 1991 1992 return 0; 1993 out3: 1994 unregister_netdevice_notifier(&geneve_notifier_block); 1995 out2: 1996 unregister_pernet_subsys(&geneve_net_ops); 1997 out1: 1998 return rc; 1999 } 2000 late_initcall(geneve_init_module); 2001 2002 static void __exit geneve_cleanup_module(void) 2003 { 2004 rtnl_link_unregister(&geneve_link_ops); 2005 unregister_netdevice_notifier(&geneve_notifier_block); 2006 unregister_pernet_subsys(&geneve_net_ops); 2007 } 2008 module_exit(geneve_cleanup_module); 2009 2010 MODULE_LICENSE("GPL"); 2011 MODULE_VERSION(GENEVE_NETDEV_VER); 2012 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 2013 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 2014 MODULE_ALIAS_RTNL_LINK("geneve"); 2015