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 #define GENEVE_OPT_NETDEV_CLASS 0x100 42 #define GENEVE_OPT_GRO_HINT_SIZE 8 43 #define GENEVE_OPT_GRO_HINT_TYPE 1 44 #define GENEVE_OPT_GRO_HINT_LEN 1 45 46 struct geneve_opt_gro_hint { 47 u8 inner_proto_id:2, 48 nested_is_v6:1; 49 u8 nested_nh_offset; 50 u8 nested_tp_offset; 51 u8 nested_hdr_len; 52 }; 53 54 struct geneve_skb_cb { 55 unsigned int gro_hint_len; 56 struct geneve_opt_gro_hint gro_hint; 57 }; 58 59 #define GENEVE_SKB_CB(__skb) ((struct geneve_skb_cb *)&((__skb)->cb[0])) 60 61 /* per-network namespace private data for this module */ 62 struct geneve_net { 63 struct list_head geneve_list; 64 /* sock_list is protected by rtnl lock */ 65 struct list_head sock_list; 66 }; 67 68 static unsigned int geneve_net_id; 69 70 struct geneve_dev_node { 71 struct hlist_node hlist; 72 struct geneve_dev *geneve; 73 }; 74 75 struct geneve_config { 76 bool collect_md; 77 bool use_udp6_rx_checksums; 78 bool ttl_inherit; 79 bool gro_hint; 80 enum ifla_geneve_df df; 81 bool inner_proto_inherit; 82 u16 port_min; 83 u16 port_max; 84 85 /* Must be last --ends in a flexible-array member. */ 86 struct ip_tunnel_info info; 87 }; 88 89 /* Pseudo network device */ 90 struct geneve_dev { 91 struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ 92 #if IS_ENABLED(CONFIG_IPV6) 93 struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ 94 #endif 95 struct net *net; /* netns for packet i/o */ 96 struct net_device *dev; /* netdev for geneve tunnel */ 97 struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ 98 #if IS_ENABLED(CONFIG_IPV6) 99 struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ 100 #endif 101 struct list_head next; /* geneve's per namespace list */ 102 struct gro_cells gro_cells; 103 struct geneve_config cfg; 104 }; 105 106 struct geneve_sock { 107 bool collect_md; 108 bool gro_hint; 109 struct list_head list; 110 struct socket *sock; 111 struct rcu_head rcu; 112 int refcnt; 113 struct hlist_head vni_list[VNI_HASH_SIZE]; 114 }; 115 116 static const __be16 proto_id_map[] = { htons(ETH_P_TEB), 117 htons(ETH_P_IPV6), 118 htons(ETH_P_IP) }; 119 120 static int proto_to_id(__be16 proto) 121 { 122 int i; 123 124 for (i = 0; i < ARRAY_SIZE(proto_id_map); i++) 125 if (proto_id_map[i] == proto) 126 return i; 127 128 return -1; 129 } 130 131 static inline __u32 geneve_net_vni_hash(u8 vni[3]) 132 { 133 __u32 vnid; 134 135 vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; 136 return hash_32(vnid, VNI_HASH_BITS); 137 } 138 139 static __be64 vni_to_tunnel_id(const __u8 *vni) 140 { 141 #ifdef __BIG_ENDIAN 142 return (vni[0] << 16) | (vni[1] << 8) | vni[2]; 143 #else 144 return (__force __be64)(((__force u64)vni[0] << 40) | 145 ((__force u64)vni[1] << 48) | 146 ((__force u64)vni[2] << 56)); 147 #endif 148 } 149 150 /* Convert 64 bit tunnel ID to 24 bit VNI. */ 151 static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) 152 { 153 #ifdef __BIG_ENDIAN 154 vni[0] = (__force __u8)(tun_id >> 16); 155 vni[1] = (__force __u8)(tun_id >> 8); 156 vni[2] = (__force __u8)tun_id; 157 #else 158 vni[0] = (__force __u8)((__force u64)tun_id >> 40); 159 vni[1] = (__force __u8)((__force u64)tun_id >> 48); 160 vni[2] = (__force __u8)((__force u64)tun_id >> 56); 161 #endif 162 } 163 164 static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) 165 { 166 return !memcmp(vni, &tun_id[5], 3); 167 } 168 169 static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) 170 { 171 return gs->sock->sk->sk_family; 172 } 173 174 static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, 175 __be32 addr, u8 vni[]) 176 { 177 struct hlist_head *vni_list_head; 178 struct geneve_dev_node *node; 179 __u32 hash; 180 181 /* Find the device for this VNI */ 182 hash = geneve_net_vni_hash(vni); 183 vni_list_head = &gs->vni_list[hash]; 184 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 185 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 186 addr == node->geneve->cfg.info.key.u.ipv4.dst) 187 return node->geneve; 188 } 189 return NULL; 190 } 191 192 #if IS_ENABLED(CONFIG_IPV6) 193 static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, 194 struct in6_addr addr6, u8 vni[]) 195 { 196 struct hlist_head *vni_list_head; 197 struct geneve_dev_node *node; 198 __u32 hash; 199 200 /* Find the device for this VNI */ 201 hash = geneve_net_vni_hash(vni); 202 vni_list_head = &gs->vni_list[hash]; 203 hlist_for_each_entry_rcu(node, vni_list_head, hlist) { 204 if (eq_tun_id_and_vni((u8 *)&node->geneve->cfg.info.key.tun_id, vni) && 205 ipv6_addr_equal(&addr6, &node->geneve->cfg.info.key.u.ipv6.dst)) 206 return node->geneve; 207 } 208 return NULL; 209 } 210 #endif 211 212 static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) 213 { 214 return (struct genevehdr *)(udp_hdr(skb) + 1); 215 } 216 217 static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, 218 struct sk_buff *skb) 219 { 220 static u8 zero_vni[3]; 221 u8 *vni; 222 223 if (geneve_get_sk_family(gs) == AF_INET) { 224 struct iphdr *iph; 225 __be32 addr; 226 227 iph = ip_hdr(skb); /* outer IP header... */ 228 229 if (gs->collect_md) { 230 vni = zero_vni; 231 addr = 0; 232 } else { 233 vni = geneve_hdr(skb)->vni; 234 addr = iph->saddr; 235 } 236 237 return geneve_lookup(gs, addr, vni); 238 #if IS_ENABLED(CONFIG_IPV6) 239 } else if (geneve_get_sk_family(gs) == AF_INET6) { 240 static struct in6_addr zero_addr6; 241 struct ipv6hdr *ip6h; 242 struct in6_addr addr6; 243 244 ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ 245 246 if (gs->collect_md) { 247 vni = zero_vni; 248 addr6 = zero_addr6; 249 } else { 250 vni = geneve_hdr(skb)->vni; 251 addr6 = ip6h->saddr; 252 } 253 254 return geneve6_lookup(gs, addr6, vni); 255 #endif 256 } 257 return NULL; 258 } 259 260 /* geneve receive/decap routine */ 261 static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, 262 struct sk_buff *skb, const struct genevehdr *gnvh) 263 { 264 struct metadata_dst *tun_dst = NULL; 265 unsigned int len; 266 int nh, err = 0; 267 void *oiph; 268 269 if (ip_tunnel_collect_metadata() || gs->collect_md) { 270 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 271 272 __set_bit(IP_TUNNEL_KEY_BIT, flags); 273 __assign_bit(IP_TUNNEL_OAM_BIT, flags, gnvh->oam); 274 __assign_bit(IP_TUNNEL_CRIT_OPT_BIT, flags, gnvh->critical); 275 276 tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, 277 vni_to_tunnel_id(gnvh->vni), 278 gnvh->opt_len * 4); 279 if (!tun_dst) { 280 dev_dstats_rx_dropped(geneve->dev); 281 goto drop; 282 } 283 /* Update tunnel dst according to Geneve options. */ 284 ip_tunnel_flags_zero(flags); 285 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, flags); 286 ip_tunnel_info_opts_set(&tun_dst->u.tun_info, 287 gnvh->options, gnvh->opt_len * 4, 288 flags); 289 } else { 290 /* Drop packets w/ critical options, 291 * since we don't support any... 292 */ 293 if (gnvh->critical) { 294 DEV_STATS_INC(geneve->dev, rx_frame_errors); 295 DEV_STATS_INC(geneve->dev, rx_errors); 296 goto drop; 297 } 298 } 299 300 if (tun_dst) 301 skb_dst_set(skb, &tun_dst->dst); 302 303 if (gnvh->proto_type == htons(ETH_P_TEB)) { 304 skb_reset_mac_header(skb); 305 skb->protocol = eth_type_trans(skb, geneve->dev); 306 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 307 308 /* Ignore packet loops (and multicast echo) */ 309 if (ether_addr_equal(eth_hdr(skb)->h_source, 310 geneve->dev->dev_addr)) { 311 DEV_STATS_INC(geneve->dev, rx_errors); 312 goto drop; 313 } 314 } else { 315 skb_reset_mac_header(skb); 316 skb->dev = geneve->dev; 317 skb->pkt_type = PACKET_HOST; 318 } 319 320 /* Save offset of outer header relative to skb->head, 321 * because we are going to reset the network header to the inner header 322 * and might change skb->head. 323 */ 324 nh = skb_network_header(skb) - skb->head; 325 326 skb_reset_network_header(skb); 327 328 if (!pskb_inet_may_pull(skb)) { 329 DEV_STATS_INC(geneve->dev, rx_length_errors); 330 DEV_STATS_INC(geneve->dev, rx_errors); 331 goto drop; 332 } 333 334 /* Get the outer header. */ 335 oiph = skb->head + nh; 336 337 if (geneve_get_sk_family(gs) == AF_INET) 338 err = IP_ECN_decapsulate(oiph, skb); 339 #if IS_ENABLED(CONFIG_IPV6) 340 else 341 err = IP6_ECN_decapsulate(oiph, skb); 342 #endif 343 344 if (unlikely(err)) { 345 if (log_ecn_error) { 346 if (geneve_get_sk_family(gs) == AF_INET) 347 net_info_ratelimited("non-ECT from %pI4 " 348 "with TOS=%#x\n", 349 &((struct iphdr *)oiph)->saddr, 350 ((struct iphdr *)oiph)->tos); 351 #if IS_ENABLED(CONFIG_IPV6) 352 else 353 net_info_ratelimited("non-ECT from %pI6\n", 354 &((struct ipv6hdr *)oiph)->saddr); 355 #endif 356 } 357 if (err > 1) { 358 DEV_STATS_INC(geneve->dev, rx_frame_errors); 359 DEV_STATS_INC(geneve->dev, rx_errors); 360 goto drop; 361 } 362 } 363 364 /* Skip the additional GRO stage when hints are in use. */ 365 len = skb->len; 366 if (skb->encapsulation) 367 err = netif_rx(skb); 368 else 369 err = gro_cells_receive(&geneve->gro_cells, skb); 370 if (likely(err == NET_RX_SUCCESS)) 371 dev_dstats_rx_add(geneve->dev, len); 372 373 return; 374 drop: 375 /* Consume bad packet */ 376 kfree_skb(skb); 377 } 378 379 /* Setup stats when device is created */ 380 static int geneve_init(struct net_device *dev) 381 { 382 struct geneve_dev *geneve = netdev_priv(dev); 383 int err; 384 385 err = gro_cells_init(&geneve->gro_cells, dev); 386 if (err) 387 return err; 388 389 err = dst_cache_init(&geneve->cfg.info.dst_cache, GFP_KERNEL); 390 if (err) { 391 gro_cells_destroy(&geneve->gro_cells); 392 return err; 393 } 394 netdev_lockdep_set_classes(dev); 395 return 0; 396 } 397 398 static void geneve_uninit(struct net_device *dev) 399 { 400 struct geneve_dev *geneve = netdev_priv(dev); 401 402 dst_cache_destroy(&geneve->cfg.info.dst_cache); 403 gro_cells_destroy(&geneve->gro_cells); 404 } 405 406 static int geneve_hlen(const struct genevehdr *gh) 407 { 408 return sizeof(*gh) + gh->opt_len * 4; 409 } 410 411 /* 412 * Look for GRO hint in the genenve options; if not found or does not pass basic 413 * sanitization return 0, otherwise the offset WRT the geneve hdr start. 414 */ 415 static unsigned int 416 geneve_opt_gro_hint_off(const struct genevehdr *gh, __be16 *type, 417 unsigned int *gh_len) 418 { 419 struct geneve_opt *opt = (void *)(gh + 1); 420 unsigned int id, opt_len = gh->opt_len; 421 struct geneve_opt_gro_hint *gro_hint; 422 423 while (opt_len >= (GENEVE_OPT_GRO_HINT_SIZE >> 2)) { 424 if (opt->opt_class == htons(GENEVE_OPT_NETDEV_CLASS) && 425 opt->type == GENEVE_OPT_GRO_HINT_TYPE && 426 opt->length == GENEVE_OPT_GRO_HINT_LEN) 427 goto found; 428 429 /* check for bad opt len */ 430 if (opt->length + 1 >= opt_len) 431 return 0; 432 433 /* next opt */ 434 opt_len -= opt->length + 1; 435 opt = ((void *)opt) + ((opt->length + 1) << 2); 436 } 437 return 0; 438 439 found: 440 gro_hint = (struct geneve_opt_gro_hint *)opt->opt_data; 441 442 /* 443 * Sanitize the hinted hdrs: the nested transport is UDP and must fit 444 * the overall hinted hdr size. 445 */ 446 if (gro_hint->nested_tp_offset + sizeof(struct udphdr) > 447 gro_hint->nested_hdr_len) 448 return 0; 449 450 if (gro_hint->nested_nh_offset + 451 (gro_hint->nested_is_v6 ? sizeof(struct ipv6hdr) : 452 sizeof(struct iphdr)) > 453 gro_hint->nested_tp_offset) 454 return 0; 455 456 /* Allow only supported L2. */ 457 id = gro_hint->inner_proto_id; 458 if (id >= ARRAY_SIZE(proto_id_map)) 459 return 0; 460 461 *type = proto_id_map[id]; 462 *gh_len += gro_hint->nested_hdr_len; 463 464 return (void *)gro_hint - (void *)gh; 465 } 466 467 static const struct geneve_opt_gro_hint * 468 geneve_opt_gro_hint(const struct genevehdr *gh, unsigned int hint_off) 469 { 470 return (const struct geneve_opt_gro_hint *)((void *)gh + hint_off); 471 } 472 473 static unsigned int 474 geneve_sk_gro_hint_off(const struct sock *sk, const struct genevehdr *gh, 475 __be16 *type, unsigned int *gh_len) 476 { 477 const struct geneve_sock *gs = rcu_dereference_sk_user_data(sk); 478 479 if (!gs || !gs->gro_hint) 480 return 0; 481 return geneve_opt_gro_hint_off(gh, type, gh_len); 482 } 483 484 /* Validate the packet headers pointed by data WRT the provided hint */ 485 static bool 486 geneve_opt_gro_hint_validate(void *data, 487 const struct geneve_opt_gro_hint *gro_hint) 488 { 489 void *nested_nh = data + gro_hint->nested_nh_offset; 490 struct iphdr *iph; 491 492 if (gro_hint->nested_is_v6) { 493 struct ipv6hdr *ipv6h = nested_nh; 494 struct ipv6_opt_hdr *opth; 495 int offset, len; 496 497 if (ipv6h->nexthdr == IPPROTO_UDP) 498 return true; 499 500 offset = sizeof(*ipv6h) + gro_hint->nested_nh_offset; 501 while (offset + sizeof(*opth) <= gro_hint->nested_tp_offset) { 502 opth = data + offset; 503 504 len = ipv6_optlen(opth); 505 if (len + offset > gro_hint->nested_tp_offset) 506 return false; 507 if (opth->nexthdr == IPPROTO_UDP) 508 return true; 509 510 offset += len; 511 } 512 return false; 513 } 514 515 iph = nested_nh; 516 if (*(u8 *)iph != 0x45 || ip_is_fragment(iph) || 517 iph->protocol != IPPROTO_UDP || ip_fast_csum((u8 *)iph, 5)) 518 return false; 519 520 return true; 521 } 522 523 /* 524 * Validate the skb headers following the specified geneve hdr vs the 525 * provided hint, including nested L4 checksum. 526 * The caller already ensured that the relevant amount of data is available 527 * in the linear part. 528 */ 529 static bool 530 geneve_opt_gro_hint_validate_csum(const struct sk_buff *skb, 531 const struct genevehdr *gh, 532 const struct geneve_opt_gro_hint *gro_hint) 533 { 534 unsigned int plen, gh_len = geneve_hlen(gh); 535 void *nested = (void *)gh + gh_len; 536 struct udphdr *nested_uh; 537 unsigned int nested_len; 538 struct ipv6hdr *ipv6h; 539 struct iphdr *iph; 540 __wsum csum, psum; 541 542 if (!geneve_opt_gro_hint_validate(nested, gro_hint)) 543 return false; 544 545 /* Use GRO hints with nested csum only if the outer header has csum. */ 546 nested_uh = nested + gro_hint->nested_tp_offset; 547 if (!nested_uh->check || skb->ip_summed == CHECKSUM_PARTIAL) 548 return true; 549 550 if (!NAPI_GRO_CB(skb)->csum_valid) 551 return false; 552 553 /* Compute the complete checksum up to the nested transport. */ 554 plen = gh_len + gro_hint->nested_tp_offset; 555 csum = csum_sub(NAPI_GRO_CB(skb)->csum, csum_partial(gh, plen, 0)); 556 nested_len = skb_gro_len(skb) - plen; 557 558 /* Compute the nested pseudo header csum. */ 559 ipv6h = nested + gro_hint->nested_nh_offset; 560 iph = (struct iphdr *)ipv6h; 561 psum = gro_hint->nested_is_v6 ? 562 ~csum_unfold(csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, 563 nested_len, IPPROTO_UDP, 0)) : 564 csum_tcpudp_nofold(iph->saddr, iph->daddr, 565 nested_len, IPPROTO_UDP, 0); 566 567 return !csum_fold(csum_add(psum, csum)); 568 } 569 570 static int geneve_post_decap_hint(const struct sock *sk, struct sk_buff *skb, 571 unsigned int gh_len, 572 struct genevehdr **geneveh) 573 { 574 const struct geneve_opt_gro_hint *gro_hint; 575 unsigned int len, total_len, hint_off; 576 struct ipv6hdr *ipv6h; 577 struct iphdr *iph; 578 struct udphdr *uh; 579 __be16 p; 580 581 hint_off = geneve_sk_gro_hint_off(sk, *geneveh, &p, &len); 582 if (!hint_off) 583 return 0; 584 585 if (!skb_is_gso(skb)) 586 return 0; 587 588 gro_hint = geneve_opt_gro_hint(*geneveh, hint_off); 589 if (unlikely(!pskb_may_pull(skb, gro_hint->nested_hdr_len))) 590 return -ENOMEM; 591 592 *geneveh = geneve_hdr(skb); 593 gro_hint = geneve_opt_gro_hint(*geneveh, hint_off); 594 595 /* 596 * Validate hints from untrusted source before accessing 597 * the headers; csum will be checked later by the nested 598 * protocol rx path. 599 */ 600 if (unlikely(skb_shinfo(skb)->gso_type & SKB_GSO_DODGY && 601 !geneve_opt_gro_hint_validate(skb->data, gro_hint))) 602 return -EINVAL; 603 604 ipv6h = (void *)skb->data + gro_hint->nested_nh_offset; 605 iph = (struct iphdr *)ipv6h; 606 total_len = skb->len - gro_hint->nested_nh_offset; 607 if (total_len > GRO_LEGACY_MAX_SIZE) 608 return -E2BIG; 609 610 /* 611 * After stripping the outer encap, the packet still carries a 612 * tunnel encapsulation: the nested one. 613 */ 614 skb->encapsulation = 1; 615 616 /* GSO expect a valid transpor header, move it to the current one. */ 617 skb_set_transport_header(skb, gro_hint->nested_tp_offset); 618 619 /* Adjust the nested IP{6} hdr to actual GSO len. */ 620 if (gro_hint->nested_is_v6) { 621 ipv6h->payload_len = htons(total_len - sizeof(*ipv6h)); 622 } else { 623 __be16 old_len = iph->tot_len; 624 625 iph->tot_len = htons(total_len); 626 627 /* For IPv4 additionally adjust the nested csum. */ 628 csum_replace2(&iph->check, old_len, iph->tot_len); 629 ip_send_check(iph); 630 } 631 632 /* Adjust the nested UDP header len and checksum. */ 633 uh = udp_hdr(skb); 634 uh->len = htons(skb->len - gro_hint->nested_tp_offset); 635 if (uh->check) { 636 len = skb->len - gro_hint->nested_nh_offset; 637 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; 638 if (gro_hint->nested_is_v6) 639 uh->check = ~udp_v6_check(len, &ipv6h->saddr, 640 &ipv6h->daddr, 0); 641 else 642 uh->check = ~udp_v4_check(len, iph->saddr, 643 iph->daddr, 0); 644 } else { 645 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL; 646 } 647 return 0; 648 } 649 650 /* Callback from net/ipv4/udp.c to receive packets */ 651 static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 652 { 653 struct genevehdr *geneveh; 654 struct geneve_dev *geneve; 655 struct geneve_sock *gs; 656 __be16 inner_proto; 657 int opts_len; 658 659 /* Need UDP and Geneve header to be present */ 660 if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) 661 goto drop; 662 663 /* Return packets with reserved bits set */ 664 geneveh = geneve_hdr(skb); 665 if (unlikely(geneveh->ver != GENEVE_VER)) 666 goto drop; 667 668 gs = rcu_dereference_sk_user_data(sk); 669 if (!gs) 670 goto drop; 671 672 geneve = geneve_lookup_skb(gs, skb); 673 if (!geneve) 674 goto drop; 675 676 inner_proto = geneveh->proto_type; 677 678 if (unlikely((!geneve->cfg.inner_proto_inherit && 679 inner_proto != htons(ETH_P_TEB)))) { 680 dev_dstats_rx_dropped(geneve->dev); 681 goto drop; 682 } 683 684 opts_len = geneveh->opt_len * 4; 685 if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto, 686 !net_eq(geneve->net, dev_net(geneve->dev)))) { 687 dev_dstats_rx_dropped(geneve->dev); 688 goto drop; 689 } 690 691 /* 692 * After hint processing, the transport header points to the inner one 693 * and we can't use anymore on geneve_hdr(). 694 */ 695 geneveh = geneve_hdr(skb); 696 if (geneve_post_decap_hint(sk, skb, sizeof(struct genevehdr) + 697 opts_len, &geneveh)) { 698 DEV_STATS_INC(geneve->dev, rx_errors); 699 goto drop; 700 } 701 702 geneve_rx(geneve, gs, skb, geneveh); 703 return 0; 704 705 drop: 706 /* Consume bad packet */ 707 kfree_skb(skb); 708 return 0; 709 } 710 711 /* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ 712 static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) 713 { 714 struct genevehdr *geneveh; 715 struct geneve_sock *gs; 716 u8 zero_vni[3] = { 0 }; 717 u8 *vni = zero_vni; 718 719 if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) 720 return -EINVAL; 721 722 geneveh = geneve_hdr(skb); 723 if (geneveh->ver != GENEVE_VER) 724 return -EINVAL; 725 726 if (geneveh->proto_type != htons(ETH_P_TEB)) 727 return -EINVAL; 728 729 gs = rcu_dereference_sk_user_data(sk); 730 if (!gs) 731 return -ENOENT; 732 733 if (geneve_get_sk_family(gs) == AF_INET) { 734 struct iphdr *iph = ip_hdr(skb); 735 __be32 addr4 = 0; 736 737 if (!gs->collect_md) { 738 vni = geneve_hdr(skb)->vni; 739 addr4 = iph->daddr; 740 } 741 742 return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; 743 } 744 745 #if IS_ENABLED(CONFIG_IPV6) 746 if (geneve_get_sk_family(gs) == AF_INET6) { 747 struct ipv6hdr *ip6h = ipv6_hdr(skb); 748 struct in6_addr addr6; 749 750 memset(&addr6, 0, sizeof(struct in6_addr)); 751 752 if (!gs->collect_md) { 753 vni = geneve_hdr(skb)->vni; 754 addr6 = ip6h->daddr; 755 } 756 757 return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; 758 } 759 #endif 760 761 return -EPFNOSUPPORT; 762 } 763 764 static struct socket *geneve_create_sock(struct net *net, bool ipv6, 765 __be16 port, bool ipv6_rx_csum) 766 { 767 struct socket *sock; 768 struct udp_port_cfg udp_conf; 769 int err; 770 771 memset(&udp_conf, 0, sizeof(udp_conf)); 772 773 if (ipv6) { 774 udp_conf.family = AF_INET6; 775 udp_conf.ipv6_v6only = 1; 776 udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; 777 } else { 778 udp_conf.family = AF_INET; 779 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 780 } 781 782 udp_conf.local_udp_port = port; 783 784 /* Open UDP socket */ 785 err = udp_sock_create(net, &udp_conf, &sock); 786 if (err < 0) 787 return ERR_PTR(err); 788 789 udp_allow_gso(sock->sk); 790 return sock; 791 } 792 793 static bool geneve_hdr_match(struct sk_buff *skb, 794 const struct genevehdr *gh, 795 const struct genevehdr *gh2, 796 unsigned int hint_off) 797 { 798 const struct geneve_opt_gro_hint *gro_hint; 799 void *nested, *nested2, *nh, *nh2; 800 struct udphdr *udp, *udp2; 801 unsigned int gh_len; 802 803 /* Match the geneve hdr and options */ 804 if (gh->opt_len != gh2->opt_len) 805 return false; 806 807 gh_len = geneve_hlen(gh); 808 if (memcmp(gh, gh2, gh_len)) 809 return false; 810 811 if (!hint_off) 812 return true; 813 814 /* 815 * When gro is present consider the nested headers as part 816 * of the geneve options 817 */ 818 nested = (void *)gh + gh_len; 819 nested2 = (void *)gh2 + gh_len; 820 gro_hint = geneve_opt_gro_hint(gh, hint_off); 821 if (!memcmp(nested, nested2, gro_hint->nested_hdr_len)) 822 return true; 823 824 /* 825 * The nested headers differ; the packets can still belong to 826 * the same flow when IPs/proto/ports match; if so flushing is 827 * required. 828 */ 829 nh = nested + gro_hint->nested_nh_offset; 830 nh2 = nested2 + gro_hint->nested_nh_offset; 831 if (gro_hint->nested_is_v6) { 832 struct ipv6hdr *iph = nh, *iph2 = nh2; 833 unsigned int nested_nlen; 834 __be32 first_word; 835 836 first_word = *(__be32 *)iph ^ *(__be32 *)iph2; 837 if ((first_word & htonl(0xF00FFFFF)) || 838 !ipv6_addr_equal(&iph->saddr, &iph2->saddr) || 839 !ipv6_addr_equal(&iph->daddr, &iph2->daddr) || 840 iph->nexthdr != iph2->nexthdr) 841 return false; 842 843 nested_nlen = gro_hint->nested_tp_offset - 844 gro_hint->nested_nh_offset; 845 if (nested_nlen > sizeof(struct ipv6hdr) && 846 (memcmp(iph + 1, iph2 + 1, 847 nested_nlen - sizeof(struct ipv6hdr)))) 848 return false; 849 } else { 850 struct iphdr *iph = nh, *iph2 = nh2; 851 852 if ((iph->protocol ^ iph2->protocol) | 853 ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | 854 ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) 855 return false; 856 } 857 858 udp = nested + gro_hint->nested_tp_offset; 859 udp2 = nested2 + gro_hint->nested_tp_offset; 860 if (udp->source != udp2->source || udp->dest != udp2->dest || 861 udp->check != udp2->check) 862 return false; 863 864 NAPI_GRO_CB(skb)->flush = 1; 865 return true; 866 } 867 868 static struct sk_buff *geneve_gro_receive(struct sock *sk, 869 struct list_head *head, 870 struct sk_buff *skb) 871 { 872 unsigned int hlen, gh_len, off_gnv, hint_off; 873 const struct geneve_opt_gro_hint *gro_hint; 874 const struct packet_offload *ptype; 875 struct genevehdr *gh, *gh2; 876 struct sk_buff *pp = NULL; 877 struct sk_buff *p; 878 int flush = 1; 879 __be16 type; 880 881 off_gnv = skb_gro_offset(skb); 882 hlen = off_gnv + sizeof(*gh); 883 gh = skb_gro_header(skb, hlen, off_gnv); 884 if (unlikely(!gh)) 885 goto out; 886 887 if (gh->ver != GENEVE_VER || gh->oam) 888 goto out; 889 gh_len = geneve_hlen(gh); 890 type = gh->proto_type; 891 892 hlen = off_gnv + gh_len; 893 if (!skb_gro_may_pull(skb, hlen)) { 894 gh = skb_gro_header_slow(skb, hlen, off_gnv); 895 if (unlikely(!gh)) 896 goto out; 897 } 898 899 /* The GRO hint/nested hdr could use a different ethernet type. */ 900 hint_off = geneve_sk_gro_hint_off(sk, gh, &type, &gh_len); 901 if (hint_off) { 902 903 /* 904 * If the hint is present, and nested hdr validation fails, do 905 * not attempt plain GRO: it will ignore inner hdrs and cause 906 * OoO. 907 */ 908 gh = skb_gro_header(skb, off_gnv + gh_len, off_gnv); 909 if (unlikely(!gh)) 910 goto out; 911 912 gro_hint = geneve_opt_gro_hint(gh, hint_off); 913 if (!geneve_opt_gro_hint_validate_csum(skb, gh, gro_hint)) 914 goto out; 915 } 916 917 list_for_each_entry(p, head, list) { 918 if (!NAPI_GRO_CB(p)->same_flow) 919 continue; 920 921 gh2 = (struct genevehdr *)(p->data + off_gnv); 922 if (!geneve_hdr_match(skb, gh, gh2, hint_off)) { 923 NAPI_GRO_CB(p)->same_flow = 0; 924 continue; 925 } 926 } 927 928 skb_gro_pull(skb, gh_len); 929 skb_gro_postpull_rcsum(skb, gh, gh_len); 930 if (likely(type == htons(ETH_P_TEB))) 931 return call_gro_receive(eth_gro_receive, head, skb); 932 933 ptype = gro_find_receive_by_type(type); 934 if (!ptype) 935 goto out; 936 937 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); 938 flush = 0; 939 940 out: 941 skb_gro_flush_final(skb, pp, flush); 942 943 return pp; 944 } 945 946 static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, 947 int nhoff) 948 { 949 struct genevehdr *gh; 950 struct packet_offload *ptype; 951 __be16 type; 952 int gh_len; 953 int err = -ENOSYS; 954 955 gh = (struct genevehdr *)(skb->data + nhoff); 956 gh_len = geneve_hlen(gh); 957 type = gh->proto_type; 958 geneve_opt_gro_hint_off(gh, &type, &gh_len); 959 960 /* since skb->encapsulation is set, eth_gro_complete() sets the inner mac header */ 961 if (likely(type == htons(ETH_P_TEB))) 962 return eth_gro_complete(skb, nhoff + gh_len); 963 964 ptype = gro_find_complete_by_type(type); 965 if (ptype) 966 err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); 967 968 skb_set_inner_mac_header(skb, nhoff + gh_len); 969 970 return err; 971 } 972 973 /* Create new listen socket if needed */ 974 static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, 975 bool ipv6, bool ipv6_rx_csum) 976 { 977 struct geneve_net *gn = net_generic(net, geneve_net_id); 978 struct geneve_sock *gs; 979 struct socket *sock; 980 struct udp_tunnel_sock_cfg tunnel_cfg; 981 int h; 982 983 gs = kzalloc_obj(*gs); 984 if (!gs) 985 return ERR_PTR(-ENOMEM); 986 987 sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); 988 if (IS_ERR(sock)) { 989 kfree(gs); 990 return ERR_CAST(sock); 991 } 992 993 gs->sock = sock; 994 gs->refcnt = 1; 995 for (h = 0; h < VNI_HASH_SIZE; ++h) 996 INIT_HLIST_HEAD(&gs->vni_list[h]); 997 998 /* Initialize the geneve udp offloads structure */ 999 udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 1000 1001 /* Mark socket as an encapsulation socket */ 1002 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 1003 tunnel_cfg.sk_user_data = gs; 1004 tunnel_cfg.encap_type = 1; 1005 tunnel_cfg.gro_receive = geneve_gro_receive; 1006 tunnel_cfg.gro_complete = geneve_gro_complete; 1007 tunnel_cfg.encap_rcv = geneve_udp_encap_recv; 1008 tunnel_cfg.encap_err_lookup = geneve_udp_encap_err_lookup; 1009 tunnel_cfg.encap_destroy = NULL; 1010 setup_udp_tunnel_sock(net, sock, &tunnel_cfg); 1011 list_add(&gs->list, &gn->sock_list); 1012 return gs; 1013 } 1014 1015 static void __geneve_sock_release(struct geneve_sock *gs) 1016 { 1017 if (!gs || --gs->refcnt) 1018 return; 1019 1020 list_del(&gs->list); 1021 udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); 1022 udp_tunnel_sock_release(gs->sock); 1023 kfree_rcu(gs, rcu); 1024 } 1025 1026 static void geneve_sock_release(struct geneve_dev *geneve) 1027 { 1028 struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); 1029 #if IS_ENABLED(CONFIG_IPV6) 1030 struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); 1031 1032 rcu_assign_pointer(geneve->sock6, NULL); 1033 #endif 1034 1035 rcu_assign_pointer(geneve->sock4, NULL); 1036 synchronize_net(); 1037 1038 __geneve_sock_release(gs4); 1039 #if IS_ENABLED(CONFIG_IPV6) 1040 __geneve_sock_release(gs6); 1041 #endif 1042 } 1043 1044 static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, 1045 sa_family_t family, 1046 __be16 dst_port, 1047 bool gro_hint) 1048 { 1049 struct geneve_sock *gs; 1050 1051 list_for_each_entry(gs, &gn->sock_list, list) { 1052 if (inet_sk(gs->sock->sk)->inet_sport == dst_port && 1053 geneve_get_sk_family(gs) == family && 1054 gs->gro_hint == gro_hint) { 1055 return gs; 1056 } 1057 } 1058 return NULL; 1059 } 1060 1061 static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) 1062 { 1063 struct net *net = geneve->net; 1064 struct geneve_net *gn = net_generic(net, geneve_net_id); 1065 bool gro_hint = geneve->cfg.gro_hint; 1066 struct geneve_dev_node *node; 1067 struct geneve_sock *gs; 1068 __u8 vni[3]; 1069 __u32 hash; 1070 1071 gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, 1072 geneve->cfg.info.key.tp_dst, gro_hint); 1073 if (gs) { 1074 gs->refcnt++; 1075 goto out; 1076 } 1077 1078 gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, 1079 geneve->cfg.use_udp6_rx_checksums); 1080 if (IS_ERR(gs)) 1081 return PTR_ERR(gs); 1082 1083 out: 1084 gs->collect_md = geneve->cfg.collect_md; 1085 gs->gro_hint = gro_hint; 1086 #if IS_ENABLED(CONFIG_IPV6) 1087 if (ipv6) { 1088 rcu_assign_pointer(geneve->sock6, gs); 1089 node = &geneve->hlist6; 1090 } else 1091 #endif 1092 { 1093 rcu_assign_pointer(geneve->sock4, gs); 1094 node = &geneve->hlist4; 1095 } 1096 node->geneve = geneve; 1097 1098 tunnel_id_to_vni(geneve->cfg.info.key.tun_id, vni); 1099 hash = geneve_net_vni_hash(vni); 1100 hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); 1101 return 0; 1102 } 1103 1104 static int geneve_open(struct net_device *dev) 1105 { 1106 struct geneve_dev *geneve = netdev_priv(dev); 1107 bool metadata = geneve->cfg.collect_md; 1108 bool ipv4, ipv6; 1109 int ret = 0; 1110 1111 ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; 1112 ipv4 = !ipv6 || metadata; 1113 #if IS_ENABLED(CONFIG_IPV6) 1114 if (ipv6) { 1115 ret = geneve_sock_add(geneve, true); 1116 if (ret < 0 && ret != -EAFNOSUPPORT) 1117 ipv4 = false; 1118 } 1119 #endif 1120 if (ipv4) 1121 ret = geneve_sock_add(geneve, false); 1122 if (ret < 0) 1123 geneve_sock_release(geneve); 1124 1125 return ret; 1126 } 1127 1128 static int geneve_stop(struct net_device *dev) 1129 { 1130 struct geneve_dev *geneve = netdev_priv(dev); 1131 1132 hlist_del_init_rcu(&geneve->hlist4.hlist); 1133 #if IS_ENABLED(CONFIG_IPV6) 1134 hlist_del_init_rcu(&geneve->hlist6.hlist); 1135 #endif 1136 geneve_sock_release(geneve); 1137 return 0; 1138 } 1139 1140 static void geneve_build_header(struct genevehdr *geneveh, 1141 const struct ip_tunnel_info *info, 1142 __be16 inner_proto) 1143 { 1144 geneveh->ver = GENEVE_VER; 1145 geneveh->opt_len = info->options_len / 4; 1146 geneveh->oam = test_bit(IP_TUNNEL_OAM_BIT, info->key.tun_flags); 1147 geneveh->critical = test_bit(IP_TUNNEL_CRIT_OPT_BIT, 1148 info->key.tun_flags); 1149 geneveh->rsvd1 = 0; 1150 tunnel_id_to_vni(info->key.tun_id, geneveh->vni); 1151 geneveh->proto_type = inner_proto; 1152 geneveh->rsvd2 = 0; 1153 1154 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags)) 1155 ip_tunnel_info_opts_get(geneveh->options, info); 1156 } 1157 1158 static int geneve_build_gro_hint_opt(const struct geneve_dev *geneve, 1159 struct sk_buff *skb) 1160 { 1161 struct geneve_skb_cb *cb = GENEVE_SKB_CB(skb); 1162 struct geneve_opt_gro_hint *hint; 1163 unsigned int nhlen; 1164 bool nested_is_v6; 1165 int id; 1166 1167 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct geneve_skb_cb)); 1168 cb->gro_hint_len = 0; 1169 1170 /* Try to add the GRO hint only in case of double encap. */ 1171 if (!geneve->cfg.gro_hint || !skb->encapsulation) 1172 return 0; 1173 1174 /* 1175 * The nested headers must fit the geneve opt len fields and the 1176 * nested encap must carry a nested transport (UDP) header. 1177 */ 1178 nhlen = skb_inner_mac_header(skb) - skb->data; 1179 if (nhlen > 255 || !skb_transport_header_was_set(skb) || 1180 skb->inner_protocol_type != ENCAP_TYPE_ETHER || 1181 (skb_transport_offset(skb) + sizeof(struct udphdr) > nhlen)) 1182 return 0; 1183 1184 id = proto_to_id(skb->inner_protocol); 1185 if (id < 0) 1186 return 0; 1187 1188 nested_is_v6 = skb->protocol == htons(ETH_P_IPV6); 1189 if (nested_is_v6) { 1190 int start = skb_network_offset(skb) + sizeof(struct ipv6hdr); 1191 u8 proto = ipv6_hdr(skb)->nexthdr; 1192 __be16 foff; 1193 1194 if (ipv6_skip_exthdr(skb, start, &proto, &foff) < 0 || 1195 proto != IPPROTO_UDP) 1196 return 0; 1197 } else { 1198 if (ip_hdr(skb)->protocol != IPPROTO_UDP) 1199 return 0; 1200 } 1201 1202 hint = &cb->gro_hint; 1203 memset(hint, 0, sizeof(*hint)); 1204 hint->inner_proto_id = id; 1205 hint->nested_is_v6 = skb->protocol == htons(ETH_P_IPV6); 1206 hint->nested_nh_offset = skb_network_offset(skb); 1207 hint->nested_tp_offset = skb_transport_offset(skb); 1208 hint->nested_hdr_len = nhlen; 1209 cb->gro_hint_len = GENEVE_OPT_GRO_HINT_SIZE; 1210 return GENEVE_OPT_GRO_HINT_SIZE; 1211 } 1212 1213 static void geneve_put_gro_hint_opt(struct genevehdr *gnvh, int opt_size, 1214 const struct geneve_opt_gro_hint *hint) 1215 { 1216 struct geneve_opt *gro_opt; 1217 1218 /* geneve_build_header() did not took in account the GRO hint. */ 1219 gnvh->opt_len = (opt_size + GENEVE_OPT_GRO_HINT_SIZE) >> 2; 1220 1221 gro_opt = (void *)(gnvh + 1) + opt_size; 1222 memset(gro_opt, 0, sizeof(*gro_opt)); 1223 1224 gro_opt->opt_class = htons(GENEVE_OPT_NETDEV_CLASS); 1225 gro_opt->type = GENEVE_OPT_GRO_HINT_TYPE; 1226 gro_opt->length = GENEVE_OPT_GRO_HINT_LEN; 1227 memcpy(gro_opt + 1, hint, sizeof(*hint)); 1228 } 1229 1230 static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, 1231 const struct ip_tunnel_info *info, 1232 const struct geneve_dev *geneve, int ip_hdr_len) 1233 { 1234 bool udp_sum = test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1235 bool inner_proto_inherit = geneve->cfg.inner_proto_inherit; 1236 bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); 1237 struct geneve_skb_cb *cb = GENEVE_SKB_CB(skb); 1238 struct genevehdr *gnvh; 1239 __be16 inner_proto; 1240 bool double_encap; 1241 int min_headroom; 1242 int opt_size; 1243 int err; 1244 1245 skb_reset_mac_header(skb); 1246 skb_scrub_packet(skb, xnet); 1247 1248 opt_size = info->options_len + cb->gro_hint_len; 1249 min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + 1250 GENEVE_BASE_HLEN + opt_size + ip_hdr_len; 1251 err = skb_cow_head(skb, min_headroom); 1252 if (unlikely(err)) 1253 goto free_dst; 1254 1255 double_encap = udp_tunnel_handle_partial(skb); 1256 err = udp_tunnel_handle_offloads(skb, udp_sum); 1257 if (err) 1258 goto free_dst; 1259 1260 gnvh = __skb_push(skb, sizeof(*gnvh) + opt_size); 1261 inner_proto = inner_proto_inherit ? skb->protocol : htons(ETH_P_TEB); 1262 geneve_build_header(gnvh, info, inner_proto); 1263 1264 if (cb->gro_hint_len) 1265 geneve_put_gro_hint_opt(gnvh, info->options_len, &cb->gro_hint); 1266 1267 udp_tunnel_set_inner_protocol(skb, double_encap, inner_proto); 1268 return 0; 1269 1270 free_dst: 1271 dst_release(dst); 1272 return err; 1273 } 1274 1275 static u8 geneve_get_dsfield(struct sk_buff *skb, struct net_device *dev, 1276 const struct ip_tunnel_info *info, 1277 bool *use_cache) 1278 { 1279 struct geneve_dev *geneve = netdev_priv(dev); 1280 u8 dsfield; 1281 1282 dsfield = info->key.tos; 1283 if (dsfield == 1 && !geneve->cfg.collect_md) { 1284 dsfield = ip_tunnel_get_dsfield(ip_hdr(skb), skb); 1285 *use_cache = false; 1286 } 1287 1288 return dsfield; 1289 } 1290 1291 static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, 1292 struct geneve_dev *geneve, 1293 const struct ip_tunnel_info *info) 1294 { 1295 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1296 const struct ip_tunnel_key *key = &info->key; 1297 struct rtable *rt; 1298 bool use_cache; 1299 __u8 tos, ttl; 1300 __be16 df = 0; 1301 __be32 saddr; 1302 __be16 sport; 1303 int err; 1304 1305 if (skb_vlan_inet_prepare(skb, geneve->cfg.inner_proto_inherit)) 1306 return -EINVAL; 1307 1308 if (!gs4) 1309 return -EIO; 1310 1311 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1312 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 1313 sport = udp_flow_src_port(geneve->net, skb, 1314 geneve->cfg.port_min, 1315 geneve->cfg.port_max, true); 1316 1317 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 1318 &info->key, 1319 sport, geneve->cfg.info.key.tp_dst, tos, 1320 use_cache ? 1321 (struct dst_cache *)&info->dst_cache : NULL); 1322 if (IS_ERR(rt)) 1323 return PTR_ERR(rt); 1324 1325 err = skb_tunnel_check_pmtu(skb, &rt->dst, 1326 GENEVE_IPV4_HLEN + info->options_len + 1327 geneve_build_gro_hint_opt(geneve, skb), 1328 netif_is_any_bridge_port(dev)); 1329 if (err < 0) { 1330 dst_release(&rt->dst); 1331 return err; 1332 } else if (err) { 1333 struct ip_tunnel_info *info; 1334 1335 info = skb_tunnel_info(skb); 1336 if (info) { 1337 struct ip_tunnel_info *unclone; 1338 1339 unclone = skb_tunnel_info_unclone(skb); 1340 if (unlikely(!unclone)) { 1341 dst_release(&rt->dst); 1342 return -ENOMEM; 1343 } 1344 1345 unclone->key.u.ipv4.dst = saddr; 1346 unclone->key.u.ipv4.src = info->key.u.ipv4.dst; 1347 } 1348 1349 if (!pskb_may_pull(skb, ETH_HLEN)) { 1350 dst_release(&rt->dst); 1351 return -EINVAL; 1352 } 1353 1354 skb->protocol = eth_type_trans(skb, geneve->dev); 1355 __netif_rx(skb); 1356 dst_release(&rt->dst); 1357 return -EMSGSIZE; 1358 } 1359 1360 tos = ip_tunnel_ecn_encap(tos, ip_hdr(skb), skb); 1361 if (geneve->cfg.collect_md) { 1362 ttl = key->ttl; 1363 1364 df = test_bit(IP_TUNNEL_DONT_FRAGMENT_BIT, key->tun_flags) ? 1365 htons(IP_DF) : 0; 1366 } else { 1367 if (geneve->cfg.ttl_inherit) 1368 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1369 else 1370 ttl = key->ttl; 1371 ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); 1372 1373 if (geneve->cfg.df == GENEVE_DF_SET) { 1374 df = htons(IP_DF); 1375 } else if (geneve->cfg.df == GENEVE_DF_INHERIT) { 1376 struct ethhdr *eth = skb_eth_hdr(skb); 1377 1378 if (ntohs(eth->h_proto) == ETH_P_IPV6) { 1379 df = htons(IP_DF); 1380 } else if (ntohs(eth->h_proto) == ETH_P_IP) { 1381 struct iphdr *iph = ip_hdr(skb); 1382 1383 if (iph->frag_off & htons(IP_DF)) 1384 df = htons(IP_DF); 1385 } 1386 } 1387 } 1388 1389 err = geneve_build_skb(&rt->dst, skb, info, geneve, 1390 sizeof(struct iphdr)); 1391 if (unlikely(err)) 1392 return err; 1393 1394 udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, saddr, info->key.u.ipv4.dst, 1395 tos, ttl, df, sport, geneve->cfg.info.key.tp_dst, 1396 !net_eq(geneve->net, dev_net(geneve->dev)), 1397 !test_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags), 1398 0); 1399 return 0; 1400 } 1401 1402 #if IS_ENABLED(CONFIG_IPV6) 1403 static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, 1404 struct geneve_dev *geneve, 1405 const struct ip_tunnel_info *info) 1406 { 1407 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1408 const struct ip_tunnel_key *key = &info->key; 1409 struct dst_entry *dst = NULL; 1410 struct in6_addr saddr; 1411 bool use_cache; 1412 __u8 prio, ttl; 1413 __be16 sport; 1414 int err; 1415 1416 if (skb_vlan_inet_prepare(skb, geneve->cfg.inner_proto_inherit)) 1417 return -EINVAL; 1418 1419 if (!gs6) 1420 return -EIO; 1421 1422 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1423 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 1424 sport = udp_flow_src_port(geneve->net, skb, 1425 geneve->cfg.port_min, 1426 geneve->cfg.port_max, true); 1427 1428 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 1429 &saddr, key, sport, 1430 geneve->cfg.info.key.tp_dst, prio, 1431 use_cache ? 1432 (struct dst_cache *)&info->dst_cache : NULL); 1433 if (IS_ERR(dst)) 1434 return PTR_ERR(dst); 1435 1436 err = skb_tunnel_check_pmtu(skb, dst, 1437 GENEVE_IPV6_HLEN + info->options_len + 1438 geneve_build_gro_hint_opt(geneve, skb), 1439 netif_is_any_bridge_port(dev)); 1440 if (err < 0) { 1441 dst_release(dst); 1442 return err; 1443 } else if (err) { 1444 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1445 1446 if (info) { 1447 struct ip_tunnel_info *unclone; 1448 1449 unclone = skb_tunnel_info_unclone(skb); 1450 if (unlikely(!unclone)) { 1451 dst_release(dst); 1452 return -ENOMEM; 1453 } 1454 1455 unclone->key.u.ipv6.dst = saddr; 1456 unclone->key.u.ipv6.src = info->key.u.ipv6.dst; 1457 } 1458 1459 if (!pskb_may_pull(skb, ETH_HLEN)) { 1460 dst_release(dst); 1461 return -EINVAL; 1462 } 1463 1464 skb->protocol = eth_type_trans(skb, geneve->dev); 1465 __netif_rx(skb); 1466 dst_release(dst); 1467 return -EMSGSIZE; 1468 } 1469 1470 prio = ip_tunnel_ecn_encap(prio, ip_hdr(skb), skb); 1471 if (geneve->cfg.collect_md) { 1472 ttl = key->ttl; 1473 } else { 1474 if (geneve->cfg.ttl_inherit) 1475 ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); 1476 else 1477 ttl = key->ttl; 1478 ttl = ttl ? : ip6_dst_hoplimit(dst); 1479 } 1480 err = geneve_build_skb(dst, skb, info, geneve, sizeof(struct ipv6hdr)); 1481 if (unlikely(err)) 1482 return err; 1483 1484 udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, 1485 &saddr, &key->u.ipv6.dst, prio, ttl, 1486 info->key.label, sport, geneve->cfg.info.key.tp_dst, 1487 !test_bit(IP_TUNNEL_CSUM_BIT, 1488 info->key.tun_flags), 1489 0); 1490 return 0; 1491 } 1492 #endif 1493 1494 static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) 1495 { 1496 struct geneve_dev *geneve = netdev_priv(dev); 1497 struct ip_tunnel_info *info = NULL; 1498 int err; 1499 1500 if (geneve->cfg.collect_md) { 1501 info = skb_tunnel_info(skb); 1502 if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { 1503 netdev_dbg(dev, "no tunnel metadata\n"); 1504 dev_kfree_skb(skb); 1505 dev_dstats_tx_dropped(dev); 1506 return NETDEV_TX_OK; 1507 } 1508 } else { 1509 info = &geneve->cfg.info; 1510 } 1511 1512 rcu_read_lock(); 1513 #if IS_ENABLED(CONFIG_IPV6) 1514 if (info->mode & IP_TUNNEL_INFO_IPV6) 1515 err = geneve6_xmit_skb(skb, dev, geneve, info); 1516 else 1517 #endif 1518 err = geneve_xmit_skb(skb, dev, geneve, info); 1519 rcu_read_unlock(); 1520 1521 if (likely(!err)) 1522 return NETDEV_TX_OK; 1523 1524 if (err != -EMSGSIZE) 1525 dev_kfree_skb(skb); 1526 1527 if (err == -ELOOP) 1528 DEV_STATS_INC(dev, collisions); 1529 else if (err == -ENETUNREACH) 1530 DEV_STATS_INC(dev, tx_carrier_errors); 1531 1532 DEV_STATS_INC(dev, tx_errors); 1533 return NETDEV_TX_OK; 1534 } 1535 1536 static int geneve_change_mtu(struct net_device *dev, int new_mtu) 1537 { 1538 if (new_mtu > dev->max_mtu) 1539 new_mtu = dev->max_mtu; 1540 else if (new_mtu < dev->min_mtu) 1541 new_mtu = dev->min_mtu; 1542 1543 WRITE_ONCE(dev->mtu, new_mtu); 1544 return 0; 1545 } 1546 1547 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) 1548 { 1549 struct ip_tunnel_info *info = skb_tunnel_info(skb); 1550 struct geneve_dev *geneve = netdev_priv(dev); 1551 __be16 sport; 1552 1553 if (ip_tunnel_info_af(info) == AF_INET) { 1554 struct rtable *rt; 1555 struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); 1556 bool use_cache; 1557 __be32 saddr; 1558 u8 tos; 1559 1560 if (!gs4) 1561 return -EIO; 1562 1563 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1564 tos = geneve_get_dsfield(skb, dev, info, &use_cache); 1565 sport = udp_flow_src_port(geneve->net, skb, 1566 geneve->cfg.port_min, 1567 geneve->cfg.port_max, true); 1568 1569 rt = udp_tunnel_dst_lookup(skb, dev, geneve->net, 0, &saddr, 1570 &info->key, 1571 sport, geneve->cfg.info.key.tp_dst, 1572 tos, 1573 use_cache ? &info->dst_cache : NULL); 1574 if (IS_ERR(rt)) 1575 return PTR_ERR(rt); 1576 1577 ip_rt_put(rt); 1578 info->key.u.ipv4.src = saddr; 1579 #if IS_ENABLED(CONFIG_IPV6) 1580 } else if (ip_tunnel_info_af(info) == AF_INET6) { 1581 struct dst_entry *dst; 1582 struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); 1583 struct in6_addr saddr; 1584 bool use_cache; 1585 u8 prio; 1586 1587 if (!gs6) 1588 return -EIO; 1589 1590 use_cache = ip_tunnel_dst_cache_usable(skb, info); 1591 prio = geneve_get_dsfield(skb, dev, info, &use_cache); 1592 sport = udp_flow_src_port(geneve->net, skb, 1593 geneve->cfg.port_min, 1594 geneve->cfg.port_max, true); 1595 1596 dst = udp_tunnel6_dst_lookup(skb, dev, geneve->net, gs6->sock, 0, 1597 &saddr, &info->key, sport, 1598 geneve->cfg.info.key.tp_dst, prio, 1599 use_cache ? &info->dst_cache : NULL); 1600 if (IS_ERR(dst)) 1601 return PTR_ERR(dst); 1602 1603 dst_release(dst); 1604 info->key.u.ipv6.src = saddr; 1605 #endif 1606 } else { 1607 return -EINVAL; 1608 } 1609 1610 info->key.tp_src = sport; 1611 info->key.tp_dst = geneve->cfg.info.key.tp_dst; 1612 return 0; 1613 } 1614 1615 static const struct net_device_ops geneve_netdev_ops = { 1616 .ndo_init = geneve_init, 1617 .ndo_uninit = geneve_uninit, 1618 .ndo_open = geneve_open, 1619 .ndo_stop = geneve_stop, 1620 .ndo_start_xmit = geneve_xmit, 1621 .ndo_change_mtu = geneve_change_mtu, 1622 .ndo_validate_addr = eth_validate_addr, 1623 .ndo_set_mac_address = eth_mac_addr, 1624 .ndo_fill_metadata_dst = geneve_fill_metadata_dst, 1625 }; 1626 1627 static void geneve_get_drvinfo(struct net_device *dev, 1628 struct ethtool_drvinfo *drvinfo) 1629 { 1630 strscpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); 1631 strscpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); 1632 } 1633 1634 static const struct ethtool_ops geneve_ethtool_ops = { 1635 .get_drvinfo = geneve_get_drvinfo, 1636 .get_link = ethtool_op_get_link, 1637 }; 1638 1639 /* Info for udev, that this is a virtual tunnel endpoint */ 1640 static const struct device_type geneve_type = { 1641 .name = "geneve", 1642 }; 1643 1644 /* Calls the ndo_udp_tunnel_add of the caller in order to 1645 * supply the listening GENEVE udp ports. Callers are expected 1646 * to implement the ndo_udp_tunnel_add. 1647 */ 1648 static void geneve_offload_rx_ports(struct net_device *dev, bool push) 1649 { 1650 struct net *net = dev_net(dev); 1651 struct geneve_net *gn = net_generic(net, geneve_net_id); 1652 struct geneve_sock *gs; 1653 1654 ASSERT_RTNL(); 1655 1656 list_for_each_entry(gs, &gn->sock_list, list) { 1657 if (push) { 1658 udp_tunnel_push_rx_port(dev, gs->sock, 1659 UDP_TUNNEL_TYPE_GENEVE); 1660 } else { 1661 udp_tunnel_drop_rx_port(dev, gs->sock, 1662 UDP_TUNNEL_TYPE_GENEVE); 1663 } 1664 } 1665 } 1666 1667 /* Initialize the device structure. */ 1668 static void geneve_setup(struct net_device *dev) 1669 { 1670 ether_setup(dev); 1671 1672 dev->netdev_ops = &geneve_netdev_ops; 1673 dev->ethtool_ops = &geneve_ethtool_ops; 1674 dev->needs_free_netdev = true; 1675 1676 SET_NETDEV_DEVTYPE(dev, &geneve_type); 1677 1678 dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1679 dev->features |= NETIF_F_RXCSUM; 1680 dev->features |= NETIF_F_GSO_SOFTWARE; 1681 1682 /* Partial features are disabled by default. */ 1683 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; 1684 dev->hw_features |= NETIF_F_RXCSUM; 1685 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 1686 dev->hw_features |= UDP_TUNNEL_PARTIAL_FEATURES; 1687 dev->hw_features |= NETIF_F_GSO_PARTIAL; 1688 1689 dev->hw_enc_features = dev->hw_features; 1690 dev->gso_partial_features = UDP_TUNNEL_PARTIAL_FEATURES; 1691 dev->mangleid_features = NETIF_F_GSO_PARTIAL; 1692 1693 dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; 1694 /* MTU range: 68 - (something less than 65535) */ 1695 dev->min_mtu = ETH_MIN_MTU; 1696 /* The max_mtu calculation does not take account of GENEVE 1697 * options, to avoid excluding potentially valid 1698 * configurations. This will be further reduced by IPvX hdr size. 1699 */ 1700 dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; 1701 1702 netif_keep_dst(dev); 1703 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1704 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; 1705 dev->lltx = true; 1706 eth_hw_addr_random(dev); 1707 } 1708 1709 static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { 1710 [IFLA_GENEVE_UNSPEC] = { .strict_start_type = IFLA_GENEVE_INNER_PROTO_INHERIT }, 1711 [IFLA_GENEVE_ID] = { .type = NLA_U32 }, 1712 [IFLA_GENEVE_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 1713 [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, 1714 [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, 1715 [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, 1716 [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, 1717 [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, 1718 [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, 1719 [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, 1720 [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, 1721 [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, 1722 [IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, 1723 [IFLA_GENEVE_DF] = { .type = NLA_U8 }, 1724 [IFLA_GENEVE_INNER_PROTO_INHERIT] = { .type = NLA_FLAG }, 1725 [IFLA_GENEVE_PORT_RANGE] = NLA_POLICY_EXACT_LEN(sizeof(struct ifla_geneve_port_range)), 1726 [IFLA_GENEVE_GRO_HINT] = { .type = NLA_FLAG }, 1727 }; 1728 1729 static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], 1730 struct netlink_ext_ack *extack) 1731 { 1732 if (tb[IFLA_ADDRESS]) { 1733 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { 1734 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1735 "Provided link layer address is not Ethernet"); 1736 return -EINVAL; 1737 } 1738 1739 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { 1740 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], 1741 "Provided Ethernet address is not unicast"); 1742 return -EADDRNOTAVAIL; 1743 } 1744 } 1745 1746 if (!data) { 1747 NL_SET_ERR_MSG(extack, 1748 "Not enough attributes provided to perform the operation"); 1749 return -EINVAL; 1750 } 1751 1752 if (data[IFLA_GENEVE_ID]) { 1753 __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1754 1755 if (vni >= GENEVE_N_VID) { 1756 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], 1757 "Geneve ID must be lower than 16777216"); 1758 return -ERANGE; 1759 } 1760 } 1761 1762 if (data[IFLA_GENEVE_DF]) { 1763 enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); 1764 1765 if (df < 0 || df > GENEVE_DF_MAX) { 1766 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], 1767 "Invalid DF attribute"); 1768 return -EINVAL; 1769 } 1770 } 1771 1772 if (data[IFLA_GENEVE_PORT_RANGE]) { 1773 const struct ifla_geneve_port_range *p; 1774 1775 p = nla_data(data[IFLA_GENEVE_PORT_RANGE]); 1776 if (ntohs(p->high) < ntohs(p->low)) { 1777 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_PORT_RANGE], 1778 "Invalid source port range"); 1779 return -EINVAL; 1780 } 1781 } 1782 1783 return 0; 1784 } 1785 1786 static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, 1787 const struct ip_tunnel_info *info, 1788 bool *tun_on_same_port, 1789 bool *tun_collect_md) 1790 { 1791 struct geneve_dev *geneve, *t = NULL; 1792 1793 *tun_on_same_port = false; 1794 *tun_collect_md = false; 1795 list_for_each_entry(geneve, &gn->geneve_list, next) { 1796 if (info->key.tp_dst == geneve->cfg.info.key.tp_dst) { 1797 *tun_collect_md = geneve->cfg.collect_md; 1798 *tun_on_same_port = true; 1799 } 1800 if (info->key.tun_id == geneve->cfg.info.key.tun_id && 1801 info->key.tp_dst == geneve->cfg.info.key.tp_dst && 1802 !memcmp(&info->key.u, &geneve->cfg.info.key.u, sizeof(info->key.u))) 1803 t = geneve; 1804 } 1805 return t; 1806 } 1807 1808 static bool is_tnl_info_zero(const struct ip_tunnel_info *info) 1809 { 1810 return !(info->key.tun_id || info->key.tos || 1811 !ip_tunnel_flags_empty(info->key.tun_flags) || 1812 info->key.ttl || info->key.label || info->key.tp_src || 1813 memchr_inv(&info->key.u, 0, sizeof(info->key.u))); 1814 } 1815 1816 static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, 1817 struct ip_tunnel_info *b) 1818 { 1819 if (ip_tunnel_info_af(a) == AF_INET) 1820 return a->key.u.ipv4.dst == b->key.u.ipv4.dst; 1821 else 1822 return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); 1823 } 1824 1825 static int geneve_configure(struct net *net, struct net_device *dev, 1826 struct netlink_ext_ack *extack, 1827 const struct geneve_config *cfg) 1828 { 1829 struct geneve_net *gn = net_generic(net, geneve_net_id); 1830 struct geneve_dev *t, *geneve = netdev_priv(dev); 1831 const struct ip_tunnel_info *info = &cfg->info; 1832 bool tun_collect_md, tun_on_same_port; 1833 int err, encap_len; 1834 1835 if (cfg->collect_md && !is_tnl_info_zero(info)) { 1836 NL_SET_ERR_MSG(extack, 1837 "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); 1838 return -EINVAL; 1839 } 1840 1841 geneve->net = net; 1842 geneve->dev = dev; 1843 1844 t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); 1845 if (t) 1846 return -EBUSY; 1847 1848 /* make enough headroom for basic scenario */ 1849 encap_len = GENEVE_BASE_HLEN + ETH_HLEN; 1850 if (!cfg->collect_md && ip_tunnel_info_af(info) == AF_INET) { 1851 encap_len += sizeof(struct iphdr); 1852 dev->max_mtu -= sizeof(struct iphdr); 1853 } else { 1854 encap_len += sizeof(struct ipv6hdr); 1855 dev->max_mtu -= sizeof(struct ipv6hdr); 1856 } 1857 dev->needed_headroom = encap_len + ETH_HLEN; 1858 1859 if (cfg->collect_md) { 1860 if (tun_on_same_port) { 1861 NL_SET_ERR_MSG(extack, 1862 "There can be only one externally controlled device on a destination port"); 1863 return -EPERM; 1864 } 1865 } else { 1866 if (tun_collect_md) { 1867 NL_SET_ERR_MSG(extack, 1868 "There already exists an externally controlled device on this destination port"); 1869 return -EPERM; 1870 } 1871 } 1872 1873 dst_cache_reset(&geneve->cfg.info.dst_cache); 1874 memcpy(&geneve->cfg, cfg, sizeof(*cfg)); 1875 1876 if (geneve->cfg.inner_proto_inherit) { 1877 dev->header_ops = NULL; 1878 dev->type = ARPHRD_NONE; 1879 dev->hard_header_len = 0; 1880 dev->addr_len = 0; 1881 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1882 } 1883 1884 err = register_netdevice(dev); 1885 if (err) 1886 return err; 1887 1888 list_add(&geneve->next, &gn->geneve_list); 1889 return 0; 1890 } 1891 1892 static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) 1893 { 1894 memset(info, 0, sizeof(*info)); 1895 info->key.tp_dst = htons(dst_port); 1896 } 1897 1898 static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], 1899 struct netlink_ext_ack *extack, 1900 struct geneve_config *cfg, bool changelink) 1901 { 1902 struct ip_tunnel_info *info = &cfg->info; 1903 int attrtype; 1904 1905 if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { 1906 NL_SET_ERR_MSG(extack, 1907 "Cannot specify both IPv4 and IPv6 Remote addresses"); 1908 return -EINVAL; 1909 } 1910 1911 if (data[IFLA_GENEVE_REMOTE]) { 1912 if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { 1913 attrtype = IFLA_GENEVE_REMOTE; 1914 goto change_notsup; 1915 } 1916 1917 info->key.u.ipv4.dst = 1918 nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); 1919 1920 if (ipv4_is_multicast(info->key.u.ipv4.dst)) { 1921 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], 1922 "Remote IPv4 address cannot be Multicast"); 1923 return -EINVAL; 1924 } 1925 } 1926 1927 if (data[IFLA_GENEVE_REMOTE6]) { 1928 #if IS_ENABLED(CONFIG_IPV6) 1929 if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { 1930 attrtype = IFLA_GENEVE_REMOTE6; 1931 goto change_notsup; 1932 } 1933 1934 info->mode = IP_TUNNEL_INFO_IPV6; 1935 info->key.u.ipv6.dst = 1936 nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); 1937 1938 if (ipv6_addr_type(&info->key.u.ipv6.dst) & 1939 IPV6_ADDR_LINKLOCAL) { 1940 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1941 "Remote IPv6 address cannot be link-local"); 1942 return -EINVAL; 1943 } 1944 if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { 1945 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1946 "Remote IPv6 address cannot be Multicast"); 1947 return -EINVAL; 1948 } 1949 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 1950 cfg->use_udp6_rx_checksums = true; 1951 #else 1952 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], 1953 "IPv6 support not enabled in the kernel"); 1954 return -EPFNOSUPPORT; 1955 #endif 1956 } 1957 1958 if (data[IFLA_GENEVE_ID]) { 1959 __u32 vni; 1960 __u8 tvni[3]; 1961 __be64 tunid; 1962 1963 vni = nla_get_u32(data[IFLA_GENEVE_ID]); 1964 tvni[0] = (vni & 0x00ff0000) >> 16; 1965 tvni[1] = (vni & 0x0000ff00) >> 8; 1966 tvni[2] = vni & 0x000000ff; 1967 1968 tunid = vni_to_tunnel_id(tvni); 1969 if (changelink && (tunid != info->key.tun_id)) { 1970 attrtype = IFLA_GENEVE_ID; 1971 goto change_notsup; 1972 } 1973 info->key.tun_id = tunid; 1974 } 1975 1976 if (data[IFLA_GENEVE_TTL_INHERIT]) { 1977 if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) 1978 cfg->ttl_inherit = true; 1979 else 1980 cfg->ttl_inherit = false; 1981 } else if (data[IFLA_GENEVE_TTL]) { 1982 info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); 1983 cfg->ttl_inherit = false; 1984 } 1985 1986 if (data[IFLA_GENEVE_TOS]) 1987 info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); 1988 1989 if (data[IFLA_GENEVE_DF]) 1990 cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); 1991 1992 if (data[IFLA_GENEVE_LABEL]) { 1993 info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & 1994 IPV6_FLOWLABEL_MASK; 1995 if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { 1996 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], 1997 "Label attribute only applies for IPv6 Geneve devices"); 1998 return -EINVAL; 1999 } 2000 } 2001 2002 if (data[IFLA_GENEVE_PORT]) { 2003 if (changelink) { 2004 attrtype = IFLA_GENEVE_PORT; 2005 goto change_notsup; 2006 } 2007 info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); 2008 } 2009 2010 if (data[IFLA_GENEVE_PORT_RANGE]) { 2011 const struct ifla_geneve_port_range *p; 2012 2013 if (changelink) { 2014 attrtype = IFLA_GENEVE_PORT_RANGE; 2015 goto change_notsup; 2016 } 2017 p = nla_data(data[IFLA_GENEVE_PORT_RANGE]); 2018 cfg->port_min = ntohs(p->low); 2019 cfg->port_max = ntohs(p->high); 2020 } 2021 2022 if (data[IFLA_GENEVE_COLLECT_METADATA]) { 2023 if (changelink) { 2024 attrtype = IFLA_GENEVE_COLLECT_METADATA; 2025 goto change_notsup; 2026 } 2027 cfg->collect_md = true; 2028 } 2029 2030 if (data[IFLA_GENEVE_UDP_CSUM]) { 2031 if (changelink) { 2032 attrtype = IFLA_GENEVE_UDP_CSUM; 2033 goto change_notsup; 2034 } 2035 if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) 2036 __set_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 2037 } 2038 2039 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { 2040 #if IS_ENABLED(CONFIG_IPV6) 2041 if (changelink) { 2042 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; 2043 goto change_notsup; 2044 } 2045 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) 2046 __clear_bit(IP_TUNNEL_CSUM_BIT, info->key.tun_flags); 2047 #else 2048 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX], 2049 "IPv6 support not enabled in the kernel"); 2050 return -EPFNOSUPPORT; 2051 #endif 2052 } 2053 2054 if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { 2055 #if IS_ENABLED(CONFIG_IPV6) 2056 if (changelink) { 2057 attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; 2058 goto change_notsup; 2059 } 2060 if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) 2061 cfg->use_udp6_rx_checksums = false; 2062 #else 2063 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX], 2064 "IPv6 support not enabled in the kernel"); 2065 return -EPFNOSUPPORT; 2066 #endif 2067 } 2068 2069 if (data[IFLA_GENEVE_INNER_PROTO_INHERIT]) { 2070 if (changelink) { 2071 attrtype = IFLA_GENEVE_INNER_PROTO_INHERIT; 2072 goto change_notsup; 2073 } 2074 cfg->inner_proto_inherit = true; 2075 } 2076 2077 if (data[IFLA_GENEVE_GRO_HINT]) { 2078 if (changelink) { 2079 attrtype = IFLA_GENEVE_GRO_HINT; 2080 goto change_notsup; 2081 } 2082 cfg->gro_hint = true; 2083 } 2084 2085 return 0; 2086 change_notsup: 2087 NL_SET_ERR_MSG_ATTR(extack, data[attrtype], 2088 "Changing VNI, Port, endpoint IP address family, external, inner_proto_inherit, gro_hint and UDP checksum attributes are not supported"); 2089 return -EOPNOTSUPP; 2090 } 2091 2092 static void geneve_link_config(struct net_device *dev, 2093 struct ip_tunnel_info *info, struct nlattr *tb[]) 2094 { 2095 struct geneve_dev *geneve = netdev_priv(dev); 2096 int ldev_mtu = 0; 2097 2098 if (tb[IFLA_MTU]) { 2099 geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 2100 return; 2101 } 2102 2103 switch (ip_tunnel_info_af(info)) { 2104 case AF_INET: { 2105 struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst }; 2106 struct rtable *rt = ip_route_output_key(geneve->net, &fl4); 2107 2108 if (!IS_ERR(rt) && rt->dst.dev) { 2109 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN; 2110 ip_rt_put(rt); 2111 } 2112 break; 2113 } 2114 #if IS_ENABLED(CONFIG_IPV6) 2115 case AF_INET6: { 2116 struct rt6_info *rt; 2117 2118 if (!__in6_dev_get(dev)) 2119 break; 2120 2121 rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0, 2122 NULL, 0); 2123 2124 if (rt && rt->dst.dev) 2125 ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN; 2126 ip6_rt_put(rt); 2127 break; 2128 } 2129 #endif 2130 } 2131 2132 if (ldev_mtu <= 0) 2133 return; 2134 2135 geneve_change_mtu(dev, ldev_mtu - info->options_len); 2136 } 2137 2138 static int geneve_newlink(struct net_device *dev, 2139 struct rtnl_newlink_params *params, 2140 struct netlink_ext_ack *extack) 2141 { 2142 struct net *link_net = rtnl_newlink_link_net(params); 2143 struct nlattr **data = params->data; 2144 struct nlattr **tb = params->tb; 2145 struct geneve_config cfg = { 2146 .df = GENEVE_DF_UNSET, 2147 .use_udp6_rx_checksums = false, 2148 .ttl_inherit = false, 2149 .collect_md = false, 2150 .port_min = 1, 2151 .port_max = USHRT_MAX, 2152 }; 2153 int err; 2154 2155 init_tnl_info(&cfg.info, GENEVE_UDP_PORT); 2156 err = geneve_nl2info(tb, data, extack, &cfg, false); 2157 if (err) 2158 return err; 2159 2160 err = geneve_configure(link_net, dev, extack, &cfg); 2161 if (err) 2162 return err; 2163 2164 geneve_link_config(dev, &cfg.info, tb); 2165 2166 return 0; 2167 } 2168 2169 /* Quiesces the geneve device data path for both TX and RX. 2170 * 2171 * On transmit geneve checks for non-NULL geneve_sock before it proceeds. 2172 * So, if we set that socket to NULL under RCU and wait for synchronize_net() 2173 * to complete for the existing set of in-flight packets to be transmitted, 2174 * then we would have quiesced the transmit data path. All the future packets 2175 * will get dropped until we unquiesce the data path. 2176 * 2177 * On receive geneve dereference the geneve_sock stashed in the socket. So, 2178 * if we set that to NULL under RCU and wait for synchronize_net() to 2179 * complete, then we would have quiesced the receive data path. 2180 */ 2181 static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, 2182 struct geneve_sock **gs6) 2183 { 2184 *gs4 = rtnl_dereference(geneve->sock4); 2185 rcu_assign_pointer(geneve->sock4, NULL); 2186 if (*gs4) 2187 rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); 2188 #if IS_ENABLED(CONFIG_IPV6) 2189 *gs6 = rtnl_dereference(geneve->sock6); 2190 rcu_assign_pointer(geneve->sock6, NULL); 2191 if (*gs6) 2192 rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); 2193 #else 2194 *gs6 = NULL; 2195 #endif 2196 synchronize_net(); 2197 } 2198 2199 /* Resumes the geneve device data path for both TX and RX. */ 2200 static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, 2201 struct geneve_sock __maybe_unused *gs6) 2202 { 2203 rcu_assign_pointer(geneve->sock4, gs4); 2204 if (gs4) 2205 rcu_assign_sk_user_data(gs4->sock->sk, gs4); 2206 #if IS_ENABLED(CONFIG_IPV6) 2207 rcu_assign_pointer(geneve->sock6, gs6); 2208 if (gs6) 2209 rcu_assign_sk_user_data(gs6->sock->sk, gs6); 2210 #endif 2211 synchronize_net(); 2212 } 2213 2214 static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], 2215 struct nlattr *data[], 2216 struct netlink_ext_ack *extack) 2217 { 2218 struct geneve_dev *geneve = netdev_priv(dev); 2219 struct geneve_sock *gs4, *gs6; 2220 struct geneve_config cfg; 2221 int err; 2222 2223 /* If the geneve device is configured for metadata (or externally 2224 * controlled, for example, OVS), then nothing can be changed. 2225 */ 2226 if (geneve->cfg.collect_md) 2227 return -EOPNOTSUPP; 2228 2229 /* Start with the existing info. */ 2230 memcpy(&cfg, &geneve->cfg, sizeof(cfg)); 2231 err = geneve_nl2info(tb, data, extack, &cfg, true); 2232 if (err) 2233 return err; 2234 2235 if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { 2236 dst_cache_reset(&cfg.info.dst_cache); 2237 geneve_link_config(dev, &cfg.info, tb); 2238 } 2239 2240 geneve_quiesce(geneve, &gs4, &gs6); 2241 memcpy(&geneve->cfg, &cfg, sizeof(cfg)); 2242 geneve_unquiesce(geneve, gs4, gs6); 2243 2244 return 0; 2245 } 2246 2247 static void geneve_dellink(struct net_device *dev, struct list_head *head) 2248 { 2249 struct geneve_dev *geneve = netdev_priv(dev); 2250 2251 list_del(&geneve->next); 2252 unregister_netdevice_queue(dev, head); 2253 } 2254 2255 static size_t geneve_get_size(const struct net_device *dev) 2256 { 2257 return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ 2258 nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ 2259 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ 2260 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ 2261 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_DF */ 2262 nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ 2263 nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ 2264 nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ 2265 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ 2266 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ 2267 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ 2268 nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ 2269 nla_total_size(0) + /* IFLA_GENEVE_INNER_PROTO_INHERIT */ 2270 nla_total_size(sizeof(struct ifla_geneve_port_range)) + /* IFLA_GENEVE_PORT_RANGE */ 2271 nla_total_size(0) + /* IFLA_GENEVE_GRO_HINT */ 2272 0; 2273 } 2274 2275 static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) 2276 { 2277 struct geneve_dev *geneve = netdev_priv(dev); 2278 struct ip_tunnel_info *info = &geneve->cfg.info; 2279 bool ttl_inherit = geneve->cfg.ttl_inherit; 2280 bool metadata = geneve->cfg.collect_md; 2281 struct ifla_geneve_port_range ports = { 2282 .low = htons(geneve->cfg.port_min), 2283 .high = htons(geneve->cfg.port_max), 2284 }; 2285 __u8 tmp_vni[3]; 2286 __u32 vni; 2287 2288 tunnel_id_to_vni(info->key.tun_id, tmp_vni); 2289 vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; 2290 if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) 2291 goto nla_put_failure; 2292 2293 if (!metadata && ip_tunnel_info_af(info) == AF_INET) { 2294 if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, 2295 info->key.u.ipv4.dst)) 2296 goto nla_put_failure; 2297 if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, 2298 test_bit(IP_TUNNEL_CSUM_BIT, 2299 info->key.tun_flags))) 2300 goto nla_put_failure; 2301 2302 #if IS_ENABLED(CONFIG_IPV6) 2303 } else if (!metadata) { 2304 if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, 2305 &info->key.u.ipv6.dst)) 2306 goto nla_put_failure; 2307 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, 2308 !test_bit(IP_TUNNEL_CSUM_BIT, 2309 info->key.tun_flags))) 2310 goto nla_put_failure; 2311 #endif 2312 } 2313 2314 if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || 2315 nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || 2316 nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) 2317 goto nla_put_failure; 2318 2319 if (nla_put_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) 2320 goto nla_put_failure; 2321 2322 if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) 2323 goto nla_put_failure; 2324 2325 if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) 2326 goto nla_put_failure; 2327 2328 #if IS_ENABLED(CONFIG_IPV6) 2329 if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, 2330 !geneve->cfg.use_udp6_rx_checksums)) 2331 goto nla_put_failure; 2332 #endif 2333 2334 if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) 2335 goto nla_put_failure; 2336 2337 if (geneve->cfg.inner_proto_inherit && 2338 nla_put_flag(skb, IFLA_GENEVE_INNER_PROTO_INHERIT)) 2339 goto nla_put_failure; 2340 2341 if (nla_put(skb, IFLA_GENEVE_PORT_RANGE, sizeof(ports), &ports)) 2342 goto nla_put_failure; 2343 2344 if (geneve->cfg.gro_hint && 2345 nla_put_flag(skb, IFLA_GENEVE_GRO_HINT)) 2346 goto nla_put_failure; 2347 2348 return 0; 2349 2350 nla_put_failure: 2351 return -EMSGSIZE; 2352 } 2353 2354 static struct rtnl_link_ops geneve_link_ops __read_mostly = { 2355 .kind = "geneve", 2356 .maxtype = IFLA_GENEVE_MAX, 2357 .policy = geneve_policy, 2358 .priv_size = sizeof(struct geneve_dev), 2359 .setup = geneve_setup, 2360 .validate = geneve_validate, 2361 .newlink = geneve_newlink, 2362 .changelink = geneve_changelink, 2363 .dellink = geneve_dellink, 2364 .get_size = geneve_get_size, 2365 .fill_info = geneve_fill_info, 2366 }; 2367 2368 struct net_device *geneve_dev_create_fb(struct net *net, const char *name, 2369 u8 name_assign_type, u16 dst_port) 2370 { 2371 struct nlattr *tb[IFLA_MAX + 1]; 2372 struct net_device *dev; 2373 LIST_HEAD(list_kill); 2374 int err; 2375 struct geneve_config cfg = { 2376 .df = GENEVE_DF_UNSET, 2377 .use_udp6_rx_checksums = true, 2378 .ttl_inherit = false, 2379 .collect_md = true, 2380 .port_min = 1, 2381 .port_max = USHRT_MAX, 2382 }; 2383 2384 memset(tb, 0, sizeof(tb)); 2385 dev = rtnl_create_link(net, name, name_assign_type, 2386 &geneve_link_ops, tb, NULL); 2387 if (IS_ERR(dev)) 2388 return dev; 2389 2390 init_tnl_info(&cfg.info, dst_port); 2391 err = geneve_configure(net, dev, NULL, &cfg); 2392 if (err) { 2393 free_netdev(dev); 2394 return ERR_PTR(err); 2395 } 2396 2397 /* openvswitch users expect packet sizes to be unrestricted, 2398 * so set the largest MTU we can. 2399 */ 2400 err = geneve_change_mtu(dev, IP_MAX_MTU); 2401 if (err) 2402 goto err; 2403 2404 err = rtnl_configure_link(dev, NULL, 0, NULL); 2405 if (err < 0) 2406 goto err; 2407 2408 return dev; 2409 err: 2410 geneve_dellink(dev, &list_kill); 2411 unregister_netdevice_many(&list_kill); 2412 return ERR_PTR(err); 2413 } 2414 EXPORT_SYMBOL_GPL(geneve_dev_create_fb); 2415 2416 static int geneve_netdevice_event(struct notifier_block *unused, 2417 unsigned long event, void *ptr) 2418 { 2419 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2420 2421 if (event == NETDEV_UDP_TUNNEL_PUSH_INFO) 2422 geneve_offload_rx_ports(dev, true); 2423 else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) 2424 geneve_offload_rx_ports(dev, false); 2425 2426 return NOTIFY_DONE; 2427 } 2428 2429 static struct notifier_block geneve_notifier_block __read_mostly = { 2430 .notifier_call = geneve_netdevice_event, 2431 }; 2432 2433 static __net_init int geneve_init_net(struct net *net) 2434 { 2435 struct geneve_net *gn = net_generic(net, geneve_net_id); 2436 2437 INIT_LIST_HEAD(&gn->geneve_list); 2438 INIT_LIST_HEAD(&gn->sock_list); 2439 return 0; 2440 } 2441 2442 static void __net_exit geneve_exit_rtnl_net(struct net *net, 2443 struct list_head *dev_to_kill) 2444 { 2445 struct geneve_net *gn = net_generic(net, geneve_net_id); 2446 struct geneve_dev *geneve, *next; 2447 2448 list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) 2449 geneve_dellink(geneve->dev, dev_to_kill); 2450 } 2451 2452 static void __net_exit geneve_exit_net(struct net *net) 2453 { 2454 const struct geneve_net *gn = net_generic(net, geneve_net_id); 2455 2456 WARN_ON_ONCE(!list_empty(&gn->sock_list)); 2457 } 2458 2459 static struct pernet_operations geneve_net_ops = { 2460 .init = geneve_init_net, 2461 .exit_rtnl = geneve_exit_rtnl_net, 2462 .exit = geneve_exit_net, 2463 .id = &geneve_net_id, 2464 .size = sizeof(struct geneve_net), 2465 }; 2466 2467 static int __init geneve_init_module(void) 2468 { 2469 int rc; 2470 2471 rc = register_pernet_subsys(&geneve_net_ops); 2472 if (rc) 2473 goto out1; 2474 2475 rc = register_netdevice_notifier(&geneve_notifier_block); 2476 if (rc) 2477 goto out2; 2478 2479 rc = rtnl_link_register(&geneve_link_ops); 2480 if (rc) 2481 goto out3; 2482 2483 return 0; 2484 out3: 2485 unregister_netdevice_notifier(&geneve_notifier_block); 2486 out2: 2487 unregister_pernet_subsys(&geneve_net_ops); 2488 out1: 2489 return rc; 2490 } 2491 late_initcall(geneve_init_module); 2492 2493 static void __exit geneve_cleanup_module(void) 2494 { 2495 rtnl_link_unregister(&geneve_link_ops); 2496 unregister_netdevice_notifier(&geneve_notifier_block); 2497 unregister_pernet_subsys(&geneve_net_ops); 2498 } 2499 module_exit(geneve_cleanup_module); 2500 2501 MODULE_LICENSE("GPL"); 2502 MODULE_VERSION(GENEVE_NETDEV_VER); 2503 MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); 2504 MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); 2505 MODULE_ALIAS_RTNL_LINK("geneve"); 2506