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