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, info->key.tun_flags), 925 0); 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 0); 1019 return 0; 1020 } 1021 #endif 1022 1023 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1024 { 1025 struct geneve_dev *geneve = netdev_priv(dev); 1026 struct ip_tunnel_info *info = NULL; 1027 int err; 1028 1029 if (geneve->cfg.collect_md) { 1030 info = skb_tunnel_info(skb); 1031 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1032 netdev_dbg(dev, "no tunnel metadata\n"); 1033 dev_kfree_skb(skb); 1034 dev_dstats_tx_dropped(dev); 1035 return NETDEV_TX_OK; 1036 } 1037 } else { 1038 info = &geneve->cfg.info; 1039 } 1040 1041 rcu_read_lock(); 1042 #if IS_ENABLED(CONFIG_IPV6) 1043 if (info->mode & IP_TUNNEL_INFO_IPV6) 1044 err = geneve6_xmit_skb(skb, dev, geneve, info); 1045 else 1046 #endif 1047 err = geneve_xmit_skb(skb, dev, geneve, info); 1048 rcu_read_unlock(); 1049 1050 if (likely(!err)) 1051 return NETDEV_TX_OK; 1052 1053 if (err != -EMSGSIZE) 1054 dev_kfree_skb(skb); 1055 1056 if (err == -ELOOP) 1057 DEV_STATS_INC(dev, collisions); 1058 else if (err == -ENETUNREACH) 1059 DEV_STATS_INC(dev, tx_carrier_errors); 1060 1061 DEV_STATS_INC(dev, tx_errors); 1062 return NETDEV_TX_OK; 1063 } 1064 1065 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1066 { 1067 if (new_mtu > dev->max_mtu) 1068 new_mtu = dev->max_mtu; 1069 else if (new_mtu < dev->min_mtu) 1070 new_mtu = dev->min_mtu; 1071 1072 WRITE_ONCE(dev->mtu, new_mtu); 1073 return 0; 1074 } 1075 1076 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1077 { 1078 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1079 struct geneve_dev *geneve = netdev_priv(dev); 1080 __be16 sport; 1081 1082 if (ip_tunnel_info_af(info) == AF_INET) { 1083 struct rtable *rt; 1084 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1085 bool use_cache; 1086 __be32 saddr; 1087 u8 tos; 1088 1089 if (!gs4) 1090 return -EIO; 1091 1092 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1093 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 1094 sport = udp_flow_src_port(geneve->net, skb, 1095 geneve->cfg.port_min, 1096 geneve->cfg.port_max, true); 1097 1098 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 1099 &info->key, 1100 sport, geneve->cfg.info.key.tp_dst, 1101 tos, 1102 use_cache ? &info->dst_cache : NULL); 1103 if (IS_ERR(rt)) 1104 return PTR_ERR(rt); 1105 1106 ip_rt_put(rt); 1107 info->key.u.ipv4.src = saddr; 1108 #if IS_ENABLED(CONFIG_IPV6) 1109 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1110 struct dst_entry *dst; 1111 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1112 struct in6_addr saddr; 1113 bool use_cache; 1114 u8 prio; 1115 1116 if (!gs6) 1117 return -EIO; 1118 1119 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1120 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 1121 sport = udp_flow_src_port(geneve->net, skb, 1122 geneve->cfg.port_min, 1123 geneve->cfg.port_max, true); 1124 1125 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 1126 &saddr, &info->key, sport, 1127 geneve->cfg.info.key.tp_dst, prio, 1128 use_cache ? &info->dst_cache : NULL); 1129 if (IS_ERR(dst)) 1130 return PTR_ERR(dst); 1131 1132 dst_release(dst); 1133 info->key.u.ipv6.src = saddr; 1134 #endif 1135 } else { 1136 return -EINVAL; 1137 } 1138 1139 info->key.tp_src = sport; 1140 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1141 return 0; 1142 } 1143 1144 static const struct net_device_ops geneve_netdev_ops = { 1145 .ndo_init = geneve_init, 1146 .ndo_uninit = geneve_uninit, 1147 .ndo_open = geneve_open, 1148 .ndo_stop = geneve_stop, 1149 .ndo_start_xmit = geneve_xmit, 1150 .ndo_change_mtu = geneve_change_mtu, 1151 .ndo_validate_addr = eth_validate_addr, 1152 .ndo_set_mac_address = eth_mac_addr, 1153 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1154 }; 1155 1156 static void geneve_get_drvinfo(struct net_device *dev, 1157 struct ethtool_drvinfo *drvinfo) 1158 { 1159 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1160 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1161 } 1162 1163 static const struct ethtool_ops geneve_ethtool_ops = { 1164 .get_drvinfo = geneve_get_drvinfo, 1165 .get_link = ethtool_op_get_link, 1166 }; 1167 1168 /* Info for udev, that this is a virtual tunnel endpoint */ 1169 static const struct device_type geneve_type = { 1170 .name = "geneve", 1171 }; 1172 1173 /* Calls the ndo_udp_tunnel_add of the caller in order to 1174 * supply the listening GENEVE udp ports. Callers are expected 1175 * to implement the ndo_udp_tunnel_add. 1176 */ 1177 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1178 { 1179 struct net *net = dev_net(dev); 1180 struct geneve_net *gn = net_generic(net, geneve_net_id); 1181 struct geneve_sock *gs; 1182 1183 rcu_read_lock(); 1184 list_for_each_entry_rcu(gs, &gn->sock_list, list) { 1185 if (push) { 1186 udp_tunnel_push_rx_port(dev, gs->sock, 1187 UDP_TUNNEL_TYPE_GENEVE); 1188 } else { 1189 udp_tunnel_drop_rx_port(dev, gs->sock, 1190 UDP_TUNNEL_TYPE_GENEVE); 1191 } 1192 } 1193 rcu_read_unlock(); 1194 } 1195 1196 /* Initialize the device structure. */ 1197 static void geneve_setup(struct net_device *dev) 1198 { 1199 ether_setup(dev); 1200 1201 dev->netdev_ops = &geneve_netdev_ops; 1202 dev->ethtool_ops = &geneve_ethtool_ops; 1203 dev->needs_free_netdev = true; 1204 1205 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1206 1207 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1208 dev->features |= NETIF_F_RXCSUM; 1209 dev->features |= NETIF_F_GSO_SOFTWARE; 1210 1211 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1212 dev->hw_features |= NETIF_F_RXCSUM; 1213 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1214 1215 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; 1216 /* MTU range: 68 - (something less than 65535) */ 1217 dev->min_mtu = ETH_MIN_MTU; 1218 /* The max_mtu calculation does not take account of GENEVE 1219 * options, to avoid excluding potentially valid 1220 * configurations. This will be further reduced by IPvX hdr size. 1221 */ 1222 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1223 1224 netif_keep_dst(dev); 1225 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1226 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1227 dev->lltx = true; 1228 eth_hw_addr_random(dev); 1229 } 1230 1231 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1232 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, 1233 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1234 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1235 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1236 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1237 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1238 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1239 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1240 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1241 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1242 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1243 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1244 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1245 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1246 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, 1247 [IFLA_GENEVE_PORT_RANGE] = NLA_POLICY_EXACT_LEN(sizeof(struct ifla_geneve_port_range)), 1248 }; 1249 1250 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1251 struct netlink_ext_ack *extack) 1252 { 1253 if (tb[IFLA_ADDRESS]) { 1254 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1255 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1256 "Provided link layer address is not Ethernet"); 1257 return -EINVAL; 1258 } 1259 1260 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1261 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1262 "Provided Ethernet address is not unicast"); 1263 return -EADDRNOTAVAIL; 1264 } 1265 } 1266 1267 if (!data) { 1268 NL_SET_ERR_MSG(extack, 1269 "Not enough attributes provided to perform the operation"); 1270 return -EINVAL; 1271 } 1272 1273 if (data[IFLA_GENEVE_ID]) { 1274 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1275 1276 if (vni >= GENEVE_N_VID) { 1277 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1278 "Geneve ID must be lower than 16777216"); 1279 return -ERANGE; 1280 } 1281 } 1282 1283 if (data[IFLA_GENEVE_DF]) { 1284 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1285 1286 if (df < 0 || df > GENEVE_DF_MAX) { 1287 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1288 "Invalid DF attribute"); 1289 return -EINVAL; 1290 } 1291 } 1292 1293 if (data[IFLA_GENEVE_PORT_RANGE]) { 1294 const struct ifla_geneve_port_range *p; 1295 1296 p = nla_data(data[IFLA_GENEVE_PORT_RANGE]); 1297 if (ntohs(p->high) < ntohs(p->low)) { 1298 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_PORT_RANGE], 1299 "Invalid source port range"); 1300 return -EINVAL; 1301 } 1302 } 1303 1304 return 0; 1305 } 1306 1307 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1308 const struct ip_tunnel_info *info, 1309 bool *tun_on_same_port, 1310 bool *tun_collect_md) 1311 { 1312 struct geneve_dev *geneve, *t = NULL; 1313 1314 *tun_on_same_port = false; 1315 *tun_collect_md = false; 1316 list_for_each_entry(geneve, &gn->geneve_list, next) { 1317 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1318 *tun_collect_md = geneve->cfg.collect_md; 1319 *tun_on_same_port = true; 1320 } 1321 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1322 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1323 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1324 t = geneve; 1325 } 1326 return t; 1327 } 1328 1329 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1330 { 1331 return !(info->key.tun_id || info->key.tos || 1332 !ip_tunnel_flags_empty(info->key.tun_flags) || 1333 info->key.ttl || info->key.label || info->key.tp_src || 1334 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1335 } 1336 1337 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1338 struct ip_tunnel_info *b) 1339 { 1340 if (ip_tunnel_info_af(a) == AF_INET) 1341 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1342 else 1343 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1344 } 1345 1346 static int geneve_configure(struct net *net, struct net_device *dev, 1347 struct netlink_ext_ack *extack, 1348 const struct geneve_config *cfg) 1349 { 1350 struct geneve_net *gn = net_generic(net, geneve_net_id); 1351 struct geneve_dev *t, *geneve = netdev_priv(dev); 1352 const struct ip_tunnel_info *info = &cfg->info; 1353 bool tun_collect_md, tun_on_same_port; 1354 int err, encap_len; 1355 1356 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1357 NL_SET_ERR_MSG(extack, 1358 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1359 return -EINVAL; 1360 } 1361 1362 geneve->net = net; 1363 geneve->dev = dev; 1364 1365 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1366 if (t) 1367 return -EBUSY; 1368 1369 /* make enough headroom for basic scenario */ 1370 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1371 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1372 encap_len += sizeof(struct iphdr); 1373 dev->max_mtu -= sizeof(struct iphdr); 1374 } else { 1375 encap_len += sizeof(struct ipv6hdr); 1376 dev->max_mtu -= sizeof(struct ipv6hdr); 1377 } 1378 dev->needed_headroom = encap_len + ETH_HLEN; 1379 1380 if (cfg->collect_md) { 1381 if (tun_on_same_port) { 1382 NL_SET_ERR_MSG(extack, 1383 "There can be only one externally controlled device on a destination port"); 1384 return -EPERM; 1385 } 1386 } else { 1387 if (tun_collect_md) { 1388 NL_SET_ERR_MSG(extack, 1389 "There already exists an externally controlled device on this destination port"); 1390 return -EPERM; 1391 } 1392 } 1393 1394 dst_cache_reset(&geneve->cfg.info.dst_cache); 1395 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1396 1397 if (geneve->cfg.inner_proto_inherit) { 1398 dev->header_ops = NULL; 1399 dev->type = ARPHRD_NONE; 1400 dev->hard_header_len = 0; 1401 dev->addr_len = 0; 1402 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1403 } 1404 1405 err = register_netdevice(dev); 1406 if (err) 1407 return err; 1408 1409 list_add(&geneve->next, &gn->geneve_list); 1410 return 0; 1411 } 1412 1413 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1414 { 1415 memset(info, 0, sizeof(*info)); 1416 info->key.tp_dst = htons(dst_port); 1417 } 1418 1419 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1420 struct netlink_ext_ack *extack, 1421 struct geneve_config *cfg, bool changelink) 1422 { 1423 struct ip_tunnel_info *info = &cfg->info; 1424 int attrtype; 1425 1426 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1427 NL_SET_ERR_MSG(extack, 1428 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1429 return -EINVAL; 1430 } 1431 1432 if (data[IFLA_GENEVE_REMOTE]) { 1433 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1434 attrtype = IFLA_GENEVE_REMOTE; 1435 goto change_notsup; 1436 } 1437 1438 info->key.u.ipv4.dst = 1439 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1440 1441 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1442 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1443 "Remote IPv4 address cannot be Multicast"); 1444 return -EINVAL; 1445 } 1446 } 1447 1448 if (data[IFLA_GENEVE_REMOTE6]) { 1449 #if IS_ENABLED(CONFIG_IPV6) 1450 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1451 attrtype = IFLA_GENEVE_REMOTE6; 1452 goto change_notsup; 1453 } 1454 1455 info->mode = IP_TUNNEL_INFO_IPV6; 1456 info->key.u.ipv6.dst = 1457 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1458 1459 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1460 IPV6_ADDR_LINKLOCAL) { 1461 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1462 "Remote IPv6 address cannot be link-local"); 1463 return -EINVAL; 1464 } 1465 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1466 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1467 "Remote IPv6 address cannot be Multicast"); 1468 return -EINVAL; 1469 } 1470 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1471 cfg->use_udp6_rx_checksums = true; 1472 #else 1473 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1474 "IPv6 support not enabled in the kernel"); 1475 return -EPFNOSUPPORT; 1476 #endif 1477 } 1478 1479 if (data[IFLA_GENEVE_ID]) { 1480 __u32 vni; 1481 __u8 tvni[3]; 1482 __be64 tunid; 1483 1484 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1485 tvni[0] = (vni & 0x00ff0000) >> 16; 1486 tvni[1] = (vni & 0x0000ff00) >> 8; 1487 tvni[2] = vni & 0x000000ff; 1488 1489 tunid = vni_to_tunnel_id(tvni); 1490 if (changelink && (tunid != info->key.tun_id)) { 1491 attrtype = IFLA_GENEVE_ID; 1492 goto change_notsup; 1493 } 1494 info->key.tun_id = tunid; 1495 } 1496 1497 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1498 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1499 cfg->ttl_inherit = true; 1500 else 1501 cfg->ttl_inherit = false; 1502 } else if (data[IFLA_GENEVE_TTL]) { 1503 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1504 cfg->ttl_inherit = false; 1505 } 1506 1507 if (data[IFLA_GENEVE_TOS]) 1508 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1509 1510 if (data[IFLA_GENEVE_DF]) 1511 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1512 1513 if (data[IFLA_GENEVE_LABEL]) { 1514 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1515 IPV6_FLOWLABEL_MASK; 1516 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1517 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1518 "Label attribute only applies for IPv6 Geneve devices"); 1519 return -EINVAL; 1520 } 1521 } 1522 1523 if (data[IFLA_GENEVE_PORT]) { 1524 if (changelink) { 1525 attrtype = IFLA_GENEVE_PORT; 1526 goto change_notsup; 1527 } 1528 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 1529 } 1530 1531 if (data[IFLA_GENEVE_PORT_RANGE]) { 1532 const struct ifla_geneve_port_range *p; 1533 1534 if (changelink) { 1535 attrtype = IFLA_GENEVE_PORT_RANGE; 1536 goto change_notsup; 1537 } 1538 p = nla_data(data[IFLA_GENEVE_PORT_RANGE]); 1539 cfg->port_min = ntohs(p->low); 1540 cfg->port_max = ntohs(p->high); 1541 } 1542 1543 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 1544 if (changelink) { 1545 attrtype = IFLA_GENEVE_COLLECT_METADATA; 1546 goto change_notsup; 1547 } 1548 cfg->collect_md = true; 1549 } 1550 1551 if (data[IFLA_GENEVE_UDP_CSUM]) { 1552 if (changelink) { 1553 attrtype = IFLA_GENEVE_UDP_CSUM; 1554 goto change_notsup; 1555 } 1556 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 1557 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1558 } 1559 1560 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 1561 #if IS_ENABLED(CONFIG_IPV6) 1562 if (changelink) { 1563 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 1564 goto change_notsup; 1565 } 1566 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 1567 __clear_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1568 #else 1569 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 1570 "IPv6 support not enabled in the kernel"); 1571 return -EPFNOSUPPORT; 1572 #endif 1573 } 1574 1575 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 1576 #if IS_ENABLED(CONFIG_IPV6) 1577 if (changelink) { 1578 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 1579 goto change_notsup; 1580 } 1581 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 1582 cfg->use_udp6_rx_checksums = false; 1583 #else 1584 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 1585 "IPv6 support not enabled in the kernel"); 1586 return -EPFNOSUPPORT; 1587 #endif 1588 } 1589 1590 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { 1591 if (changelink) { 1592 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; 1593 goto change_notsup; 1594 } 1595 cfg->inner_proto_inherit = true; 1596 } 1597 1598 return 0; 1599 change_notsup: 1600 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 1601 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, and UDP checksum attributes are not supported"); 1602 return -EOPNOTSUPP; 1603 } 1604 1605 static void geneve_link_config(struct net_device *dev, 1606 struct ip_tunnel_info *info, struct nlattr *tb[]) 1607 { 1608 struct geneve_dev *geneve = netdev_priv(dev); 1609 int ldev_mtu = 0; 1610 1611 if (tb[IFLA_MTU]) { 1612 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 1613 return; 1614 } 1615 1616 switch (ip_tunnel_info_af(info)) { 1617 case AF_INET: { 1618 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 1619 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 1620 1621 if (!IS_ERR(rt) && rt->dst.dev) { 1622 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 1623 ip_rt_put(rt); 1624 } 1625 break; 1626 } 1627 #if IS_ENABLED(CONFIG_IPV6) 1628 case AF_INET6: { 1629 struct rt6_info *rt; 1630 1631 if (!__in6_dev_get(dev)) 1632 break; 1633 1634 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 1635 NULL, 0); 1636 1637 if (rt && rt->dst.dev) 1638 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 1639 ip6_rt_put(rt); 1640 break; 1641 } 1642 #endif 1643 } 1644 1645 if (ldev_mtu <= 0) 1646 return; 1647 1648 geneve_change_mtu(dev, ldev_mtu - info->options_len); 1649 } 1650 1651 static int geneve_newlink(struct net_device *dev, 1652 struct rtnl_newlink_params *params, 1653 struct netlink_ext_ack *extack) 1654 { 1655 struct net *link_net = rtnl_newlink_link_net(params); 1656 struct nlattr **data = params->data; 1657 struct nlattr **tb = params->tb; 1658 struct geneve_config cfg = { 1659 .df = GENEVE_DF_UNSET, 1660 .use_udp6_rx_checksums = false, 1661 .ttl_inherit = false, 1662 .collect_md = false, 1663 .port_min = 1, 1664 .port_max = USHRT_MAX, 1665 }; 1666 int err; 1667 1668 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 1669 err = geneve_nl2info(tb, data, extack, &cfg, false); 1670 if (err) 1671 return err; 1672 1673 err = geneve_configure(link_net, dev, extack, &cfg); 1674 if (err) 1675 return err; 1676 1677 geneve_link_config(dev, &cfg.info, tb); 1678 1679 return 0; 1680 } 1681 1682 /* Quiesces the geneve device data path for both TX and RX. 1683 * 1684 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 1685 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 1686 * to complete for the existing set of in-flight packets to be transmitted, 1687 * then we would have quiesced the transmit data path. All the future packets 1688 * will get dropped until we unquiesce the data path. 1689 * 1690 * On receive geneve dereference the geneve_sock stashed in the socket. So, 1691 * if we set that to NULL under RCU and wait for synchronize_net() to 1692 * complete, then we would have quiesced the receive data path. 1693 */ 1694 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 1695 struct geneve_sock **gs6) 1696 { 1697 *gs4 = rtnl_dereference(geneve->sock4); 1698 rcu_assign_pointer(geneve->sock4, NULL); 1699 if (*gs4) 1700 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 1701 #if IS_ENABLED(CONFIG_IPV6) 1702 *gs6 = rtnl_dereference(geneve->sock6); 1703 rcu_assign_pointer(geneve->sock6, NULL); 1704 if (*gs6) 1705 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 1706 #else 1707 *gs6 = NULL; 1708 #endif 1709 synchronize_net(); 1710 } 1711 1712 /* Resumes the geneve device data path for both TX and RX. */ 1713 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 1714 struct geneve_sock __maybe_unused *gs6) 1715 { 1716 rcu_assign_pointer(geneve->sock4, gs4); 1717 if (gs4) 1718 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 1719 #if IS_ENABLED(CONFIG_IPV6) 1720 rcu_assign_pointer(geneve->sock6, gs6); 1721 if (gs6) 1722 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 1723 #endif 1724 synchronize_net(); 1725 } 1726 1727 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 1728 struct nlattr *data[], 1729 struct netlink_ext_ack *extack) 1730 { 1731 struct geneve_dev *geneve = netdev_priv(dev); 1732 struct geneve_sock *gs4, *gs6; 1733 struct geneve_config cfg; 1734 int err; 1735 1736 /* If the geneve device is configured for metadata (or externally 1737 * controlled, for example, OVS), then nothing can be changed. 1738 */ 1739 if (geneve->cfg.collect_md) 1740 return -EOPNOTSUPP; 1741 1742 /* Start with the existing info. */ 1743 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 1744 err = geneve_nl2info(tb, data, extack, &cfg, true); 1745 if (err) 1746 return err; 1747 1748 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 1749 dst_cache_reset(&cfg.info.dst_cache); 1750 geneve_link_config(dev, &cfg.info, tb); 1751 } 1752 1753 geneve_quiesce(geneve, &gs4, &gs6); 1754 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 1755 geneve_unquiesce(geneve, gs4, gs6); 1756 1757 return 0; 1758 } 1759 1760 static void geneve_dellink(struct net_device *dev, struct list_head *head) 1761 { 1762 struct geneve_dev *geneve = netdev_priv(dev); 1763 1764 list_del(&geneve->next); 1765 unregister_netdevice_queue(dev, head); 1766 } 1767 1768 static size_t geneve_get_size(const struct net_device *dev) 1769 { 1770 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 1771 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 1772 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 1773 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 1774 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 1775 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 1776 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 1777 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 1778 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 1779 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 1780 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 1781 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 1782 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ 1783 nla_total_size(sizeof(struct ifla_geneve_port_range)) + /* IFLA_GENEVE_PORT_RANGE */ 1784 0; 1785 } 1786 1787 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 1788 { 1789 struct geneve_dev *geneve = netdev_priv(dev); 1790 struct ip_tunnel_info *info = &geneve->cfg.info; 1791 bool ttl_inherit = geneve->cfg.ttl_inherit; 1792 bool metadata = geneve->cfg.collect_md; 1793 struct ifla_geneve_port_range ports = { 1794 .low = htons(geneve->cfg.port_min), 1795 .high = htons(geneve->cfg.port_max), 1796 }; 1797 __u8 tmp_vni[3]; 1798 __u32 vni; 1799 1800 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 1801 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 1802 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 1803 goto nla_put_failure; 1804 1805 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 1806 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 1807 info->key.u.ipv4.dst)) 1808 goto nla_put_failure; 1809 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 1810 test_bit(IP_TUNNEL_CSUM_BIT, 1811 info->key.tun_flags))) 1812 goto nla_put_failure; 1813 1814 #if IS_ENABLED(CONFIG_IPV6) 1815 } else if (!metadata) { 1816 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 1817 &info->key.u.ipv6.dst)) 1818 goto nla_put_failure; 1819 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 1820 !test_bit(IP_TUNNEL_CSUM_BIT, 1821 info->key.tun_flags))) 1822 goto nla_put_failure; 1823 #endif 1824 } 1825 1826 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 1827 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 1828 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 1829 goto nla_put_failure; 1830 1831 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 1832 goto nla_put_failure; 1833 1834 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 1835 goto nla_put_failure; 1836 1837 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 1838 goto nla_put_failure; 1839 1840 #if IS_ENABLED(CONFIG_IPV6) 1841 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 1842 !geneve->cfg.use_udp6_rx_checksums)) 1843 goto nla_put_failure; 1844 #endif 1845 1846 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 1847 goto nla_put_failure; 1848 1849 if (geneve->cfg.inner_proto_inherit && 1850 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) 1851 goto nla_put_failure; 1852 1853 if (nla_put(skb, IFLA_GENEVE_PORT_RANGE, sizeof(ports), &ports)) 1854 goto nla_put_failure; 1855 1856 return 0; 1857 1858 nla_put_failure: 1859 return -EMSGSIZE; 1860 } 1861 1862 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 1863 .kind = "geneve", 1864 .maxtype = IFLA_GENEVE_MAX, 1865 .policy = geneve_policy, 1866 .priv_size = sizeof(struct geneve_dev), 1867 .setup = geneve_setup, 1868 .validate = geneve_validate, 1869 .newlink = geneve_newlink, 1870 .changelink = geneve_changelink, 1871 .dellink = geneve_dellink, 1872 .get_size = geneve_get_size, 1873 .fill_info = geneve_fill_info, 1874 }; 1875 1876 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 1877 u8 name_assign_type, u16 dst_port) 1878 { 1879 struct nlattr *tb[IFLA_MAX + 1]; 1880 struct net_device *dev; 1881 LIST_HEAD(list_kill); 1882 int err; 1883 struct geneve_config cfg = { 1884 .df = GENEVE_DF_UNSET, 1885 .use_udp6_rx_checksums = true, 1886 .ttl_inherit = false, 1887 .collect_md = true, 1888 .port_min = 1, 1889 .port_max = USHRT_MAX, 1890 }; 1891 1892 memset(tb, 0, sizeof(tb)); 1893 dev = rtnl_create_link(net, name, name_assign_type, 1894 &geneve_link_ops, tb, NULL); 1895 if (IS_ERR(dev)) 1896 return dev; 1897 1898 init_tnl_info(&cfg.info, dst_port); 1899 err = geneve_configure(net, dev, NULL, &cfg); 1900 if (err) { 1901 free_netdev(dev); 1902 return ERR_PTR(err); 1903 } 1904 1905 /* openvswitch users expect packet sizes to be unrestricted, 1906 * so set the largest MTU we can. 1907 */ 1908 err = geneve_change_mtu(dev, IP_MAX_MTU); 1909 if (err) 1910 goto err; 1911 1912 err = rtnl_configure_link(dev, NULL, 0, NULL); 1913 if (err < 0) 1914 goto err; 1915 1916 return dev; 1917 err: 1918 geneve_dellink(dev, &list_kill); 1919 unregister_netdevice_many(&list_kill); 1920 return ERR_PTR(err); 1921 } 1922 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 1923 1924 static int geneve_netdevice_event(struct notifier_block *unused, 1925 unsigned long event, void *ptr) 1926 { 1927 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1928 1929 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 1930 geneve_offload_rx_ports(dev, true); 1931 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 1932 geneve_offload_rx_ports(dev, false); 1933 1934 return NOTIFY_DONE; 1935 } 1936 1937 static struct notifier_block geneve_notifier_block __read_mostly = { 1938 .notifier_call = geneve_netdevice_event, 1939 }; 1940 1941 static __net_init int geneve_init_net(struct net *net) 1942 { 1943 struct geneve_net *gn = net_generic(net, geneve_net_id); 1944 1945 INIT_LIST_HEAD(&gn->geneve_list); 1946 INIT_LIST_HEAD(&gn->sock_list); 1947 return 0; 1948 } 1949 1950 static void __net_exit geneve_exit_rtnl_net(struct net *net, 1951 struct list_head *dev_to_kill) 1952 { 1953 struct geneve_net *gn = net_generic(net, geneve_net_id); 1954 struct geneve_dev *geneve, *next; 1955 1956 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) 1957 geneve_dellink(geneve->dev, dev_to_kill); 1958 } 1959 1960 static void __net_exit geneve_exit_net(struct net *net) 1961 { 1962 const struct geneve_net *gn = net_generic(net, geneve_net_id); 1963 1964 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 1965 } 1966 1967 static struct pernet_operations geneve_net_ops = { 1968 .init = geneve_init_net, 1969 .exit_rtnl = geneve_exit_rtnl_net, 1970 .exit = geneve_exit_net, 1971 .id = &geneve_net_id, 1972 .size = sizeof(struct geneve_net), 1973 }; 1974 1975 static int __init geneve_init_module(void) 1976 { 1977 int rc; 1978 1979 rc = register_pernet_subsys(&geneve_net_ops); 1980 if (rc) 1981 goto out1; 1982 1983 rc = register_netdevice_notifier(&geneve_notifier_block); 1984 if (rc) 1985 goto out2; 1986 1987 rc = rtnl_link_register(&geneve_link_ops); 1988 if (rc) 1989 goto out3; 1990 1991 return 0; 1992 out3: 1993 unregister_netdevice_notifier(&geneve_notifier_block); 1994 out2: 1995 unregister_pernet_subsys(&geneve_net_ops); 1996 out1: 1997 return rc; 1998 } 1999 late_initcall(geneve_init_module); 2000 2001 static void __exit geneve_cleanup_module(void) 2002 { 2003 rtnl_link_unregister(&geneve_link_ops); 2004 unregister_netdevice_notifier(&geneve_notifier_block); 2005 unregister_pernet_subsys(&geneve_net_ops); 2006 } 2007 module_exit(geneve_cleanup_module); 2008 2009 MODULE_LICENSE("GPL"); 2010 MODULE_VERSION(GENEVE_NETDEV_VER); 2011 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 2012 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 2013 MODULE_ALIAS_RTNL_LINK("geneve"); 2014