1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2013 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/types.h> 9 #include <linux/kernel.h> 10 #include <linux/skbuff.h> 11 #include <linux/netdevice.h> 12 #include <linux/in.h> 13 #include <linux/if_arp.h> 14 #include <linux/init.h> 15 #include <linux/in6.h> 16 #include <linux/inetdevice.h> 17 #include <linux/netfilter_ipv4.h> 18 #include <linux/etherdevice.h> 19 #include <linux/if_ether.h> 20 #include <linux/if_vlan.h> 21 #include <linux/static_key.h> 22 23 #include <net/ip.h> 24 #include <net/icmp.h> 25 #include <net/protocol.h> 26 #include <net/ip_tunnels.h> 27 #include <net/ip6_tunnel.h> 28 #include <net/arp.h> 29 #include <net/checksum.h> 30 #include <net/dsfield.h> 31 #include <net/inet_ecn.h> 32 #include <net/xfrm.h> 33 #include <net/net_namespace.h> 34 #include <net/netns/generic.h> 35 #include <net/rtnetlink.h> 36 #include <net/dst_metadata.h> 37 #include <net/geneve.h> 38 #include <net/vxlan.h> 39 40 const struct ip_tunnel_encap_ops __rcu * 41 iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; 42 EXPORT_SYMBOL(iptun_encaps); 43 44 const struct ip6_tnl_encap_ops __rcu * 45 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; 46 EXPORT_SYMBOL(ip6tun_encaps); 47 48 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 49 __be32 src, __be32 dst, __u8 proto, 50 __u8 tos, __u8 ttl, __be16 df, bool xnet) 51 { 52 int pkt_len = skb->len - skb_inner_network_offset(skb); 53 struct net *net = dev_net(rt->dst.dev); 54 struct net_device *dev = skb->dev; 55 struct iphdr *iph; 56 int err; 57 58 skb_scrub_packet(skb, xnet); 59 60 skb_clear_hash_if_not_l4(skb); 61 skb_dst_set(skb, &rt->dst); 62 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 63 64 /* Push down and install the IP header. */ 65 skb_push(skb, sizeof(struct iphdr)); 66 skb_reset_network_header(skb); 67 68 iph = ip_hdr(skb); 69 70 iph->version = 4; 71 iph->ihl = sizeof(struct iphdr) >> 2; 72 iph->frag_off = ip_mtu_locked(&rt->dst) ? 0 : df; 73 iph->protocol = proto; 74 iph->tos = tos; 75 iph->daddr = dst; 76 iph->saddr = src; 77 iph->ttl = ttl; 78 __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1); 79 80 err = ip_local_out(net, sk, skb); 81 82 if (dev) { 83 if (unlikely(net_xmit_eval(err))) 84 pkt_len = 0; 85 iptunnel_xmit_stats(dev, pkt_len); 86 } 87 } 88 EXPORT_SYMBOL_GPL(iptunnel_xmit); 89 90 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 91 __be16 inner_proto, bool raw_proto, bool xnet) 92 { 93 if (unlikely(!pskb_may_pull(skb, hdr_len))) 94 return -ENOMEM; 95 96 skb_pull_rcsum(skb, hdr_len); 97 98 if (!raw_proto && inner_proto == htons(ETH_P_TEB)) { 99 struct ethhdr *eh; 100 101 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 102 return -ENOMEM; 103 104 eh = (struct ethhdr *)skb->data; 105 if (likely(eth_proto_is_802_3(eh->h_proto))) 106 skb->protocol = eh->h_proto; 107 else 108 skb->protocol = htons(ETH_P_802_2); 109 110 } else { 111 skb->protocol = inner_proto; 112 } 113 114 skb_clear_hash_if_not_l4(skb); 115 __vlan_hwaccel_clear_tag(skb); 116 skb_set_queue_mapping(skb, 0); 117 skb_scrub_packet(skb, xnet); 118 119 return iptunnel_pull_offloads(skb); 120 } 121 EXPORT_SYMBOL_GPL(__iptunnel_pull_header); 122 123 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, 124 gfp_t flags) 125 { 126 struct metadata_dst *res; 127 struct ip_tunnel_info *dst, *src; 128 129 if (!md || md->type != METADATA_IP_TUNNEL || 130 md->u.tun_info.mode & IP_TUNNEL_INFO_TX) 131 return NULL; 132 133 src = &md->u.tun_info; 134 res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags); 135 if (!res) 136 return NULL; 137 138 dst = &res->u.tun_info; 139 dst->key.tun_id = src->key.tun_id; 140 if (src->mode & IP_TUNNEL_INFO_IPV6) 141 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src, 142 sizeof(struct in6_addr)); 143 else 144 dst->key.u.ipv4.dst = src->key.u.ipv4.src; 145 dst->key.tun_flags = src->key.tun_flags; 146 dst->mode = src->mode | IP_TUNNEL_INFO_TX; 147 ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src), 148 src->options_len, 0); 149 150 return res; 151 } 152 EXPORT_SYMBOL_GPL(iptunnel_metadata_reply); 153 154 int iptunnel_handle_offloads(struct sk_buff *skb, 155 int gso_type_mask) 156 { 157 int err; 158 159 if (likely(!skb->encapsulation)) { 160 skb_reset_inner_headers(skb); 161 skb->encapsulation = 1; 162 } 163 164 if (skb_is_gso(skb)) { 165 err = skb_header_unclone(skb, GFP_ATOMIC); 166 if (unlikely(err)) 167 return err; 168 skb_shinfo(skb)->gso_type |= gso_type_mask; 169 return 0; 170 } 171 172 if (skb->ip_summed != CHECKSUM_PARTIAL) { 173 skb->ip_summed = CHECKSUM_NONE; 174 /* We clear encapsulation here to prevent badly-written 175 * drivers potentially deciding to offload an inner checksum 176 * if we set CHECKSUM_PARTIAL on the outer header. 177 * This should go away when the drivers are all fixed. 178 */ 179 skb->encapsulation = 0; 180 } 181 182 return 0; 183 } 184 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); 185 186 /* Often modified stats are per cpu, other are shared (netdev->stats) */ 187 void ip_tunnel_get_stats64(struct net_device *dev, 188 struct rtnl_link_stats64 *tot) 189 { 190 int i; 191 192 netdev_stats_to_stats64(tot, &dev->stats); 193 194 for_each_possible_cpu(i) { 195 const struct pcpu_sw_netstats *tstats = 196 per_cpu_ptr(dev->tstats, i); 197 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 198 unsigned int start; 199 200 do { 201 start = u64_stats_fetch_begin_irq(&tstats->syncp); 202 rx_packets = tstats->rx_packets; 203 tx_packets = tstats->tx_packets; 204 rx_bytes = tstats->rx_bytes; 205 tx_bytes = tstats->tx_bytes; 206 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 207 208 tot->rx_packets += rx_packets; 209 tot->tx_packets += tx_packets; 210 tot->rx_bytes += rx_bytes; 211 tot->tx_bytes += tx_bytes; 212 } 213 } 214 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); 215 216 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = { 217 [LWTUNNEL_IP_ID] = { .type = NLA_U64 }, 218 [LWTUNNEL_IP_DST] = { .type = NLA_U32 }, 219 [LWTUNNEL_IP_SRC] = { .type = NLA_U32 }, 220 [LWTUNNEL_IP_TTL] = { .type = NLA_U8 }, 221 [LWTUNNEL_IP_TOS] = { .type = NLA_U8 }, 222 [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 }, 223 [LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED }, 224 }; 225 226 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = { 227 [LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED }, 228 [LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED }, 229 }; 230 231 static const struct nla_policy 232 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = { 233 [LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 }, 234 [LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 }, 235 [LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 128 }, 236 }; 237 238 static const struct nla_policy 239 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = { 240 [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 }, 241 }; 242 243 static int ip_tun_parse_opts_geneve(struct nlattr *attr, 244 struct ip_tunnel_info *info, 245 struct netlink_ext_ack *extack) 246 { 247 struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1]; 248 int data_len, err; 249 250 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, 251 attr, geneve_opt_policy, extack); 252 if (err) 253 return err; 254 255 if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] || 256 !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] || 257 !tb[LWTUNNEL_IP_OPT_GENEVE_DATA]) 258 return -EINVAL; 259 260 attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA]; 261 data_len = nla_len(attr); 262 if (data_len % 4) 263 return -EINVAL; 264 265 if (info) { 266 struct geneve_opt *opt = ip_tunnel_info_opts(info); 267 268 memcpy(opt->opt_data, nla_data(attr), data_len); 269 opt->length = data_len / 4; 270 attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS]; 271 opt->opt_class = nla_get_be16(attr); 272 attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE]; 273 opt->type = nla_get_u8(attr); 274 info->key.tun_flags |= TUNNEL_GENEVE_OPT; 275 } 276 277 return sizeof(struct geneve_opt) + data_len; 278 } 279 280 static int ip_tun_parse_opts_vxlan(struct nlattr *attr, 281 struct ip_tunnel_info *info, 282 struct netlink_ext_ack *extack) 283 { 284 struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1]; 285 int err; 286 287 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, 288 attr, vxlan_opt_policy, extack); 289 if (err) 290 return err; 291 292 if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP]) 293 return -EINVAL; 294 295 if (info) { 296 struct vxlan_metadata *md = ip_tunnel_info_opts(info); 297 298 attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP]; 299 md->gbp = nla_get_u32(attr); 300 info->key.tun_flags |= TUNNEL_VXLAN_OPT; 301 } 302 303 return sizeof(struct vxlan_metadata); 304 } 305 306 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info, 307 struct netlink_ext_ack *extack) 308 { 309 struct nlattr *tb[LWTUNNEL_IP_OPTS_MAX + 1]; 310 int err; 311 312 if (!attr) 313 return 0; 314 315 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_OPTS_MAX, attr, 316 ip_opts_policy, extack); 317 if (err) 318 return err; 319 320 if (tb[LWTUNNEL_IP_OPTS_GENEVE]) 321 err = ip_tun_parse_opts_geneve(tb[LWTUNNEL_IP_OPTS_GENEVE], 322 info, extack); 323 else if (tb[LWTUNNEL_IP_OPTS_VXLAN]) 324 err = ip_tun_parse_opts_vxlan(tb[LWTUNNEL_IP_OPTS_VXLAN], 325 info, extack); 326 else 327 err = -EINVAL; 328 329 return err; 330 } 331 332 static int ip_tun_get_optlen(struct nlattr *attr, 333 struct netlink_ext_ack *extack) 334 { 335 return ip_tun_parse_opts(attr, NULL, extack); 336 } 337 338 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info, 339 struct netlink_ext_ack *extack) 340 { 341 return ip_tun_parse_opts(attr, info, extack); 342 } 343 344 static int ip_tun_build_state(struct nlattr *attr, 345 unsigned int family, const void *cfg, 346 struct lwtunnel_state **ts, 347 struct netlink_ext_ack *extack) 348 { 349 struct nlattr *tb[LWTUNNEL_IP_MAX + 1]; 350 struct lwtunnel_state *new_state; 351 struct ip_tunnel_info *tun_info; 352 int err, opt_len; 353 354 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr, 355 ip_tun_policy, extack); 356 if (err < 0) 357 return err; 358 359 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack); 360 if (opt_len < 0) 361 return opt_len; 362 363 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 364 if (!new_state) 365 return -ENOMEM; 366 367 new_state->type = LWTUNNEL_ENCAP_IP; 368 369 tun_info = lwt_tun_info(new_state); 370 371 err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack); 372 if (err < 0) { 373 lwtstate_free(new_state); 374 return err; 375 } 376 377 #ifdef CONFIG_DST_CACHE 378 err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL); 379 if (err) { 380 lwtstate_free(new_state); 381 return err; 382 } 383 #endif 384 385 if (tb[LWTUNNEL_IP_ID]) 386 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]); 387 388 if (tb[LWTUNNEL_IP_DST]) 389 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]); 390 391 if (tb[LWTUNNEL_IP_SRC]) 392 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]); 393 394 if (tb[LWTUNNEL_IP_TTL]) 395 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]); 396 397 if (tb[LWTUNNEL_IP_TOS]) 398 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]); 399 400 if (tb[LWTUNNEL_IP_FLAGS]) 401 tun_info->key.tun_flags |= nla_get_be16(tb[LWTUNNEL_IP_FLAGS]); 402 403 tun_info->mode = IP_TUNNEL_INFO_TX; 404 tun_info->options_len = opt_len; 405 406 *ts = new_state; 407 408 return 0; 409 } 410 411 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate) 412 { 413 #ifdef CONFIG_DST_CACHE 414 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 415 416 dst_cache_destroy(&tun_info->dst_cache); 417 #endif 418 } 419 420 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb, 421 struct ip_tunnel_info *tun_info) 422 { 423 struct geneve_opt *opt; 424 struct nlattr *nest; 425 426 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE); 427 if (!nest) 428 return -ENOMEM; 429 430 opt = ip_tunnel_info_opts(tun_info); 431 if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS, opt->opt_class) || 432 nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) || 433 nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4, 434 opt->opt_data)) { 435 nla_nest_cancel(skb, nest); 436 return -ENOMEM; 437 } 438 439 nla_nest_end(skb, nest); 440 return 0; 441 } 442 443 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb, 444 struct ip_tunnel_info *tun_info) 445 { 446 struct vxlan_metadata *md; 447 struct nlattr *nest; 448 449 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN); 450 if (!nest) 451 return -ENOMEM; 452 453 md = ip_tunnel_info_opts(tun_info); 454 if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) { 455 nla_nest_cancel(skb, nest); 456 return -ENOMEM; 457 } 458 459 nla_nest_end(skb, nest); 460 return 0; 461 } 462 463 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type, 464 struct ip_tunnel_info *tun_info) 465 { 466 struct nlattr *nest; 467 int err = 0; 468 469 if (!(tun_info->key.tun_flags & 470 (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT))) 471 return 0; 472 473 nest = nla_nest_start_noflag(skb, type); 474 if (!nest) 475 return -ENOMEM; 476 477 if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT) 478 err = ip_tun_fill_encap_opts_geneve(skb, tun_info); 479 else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT) 480 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info); 481 482 if (err) { 483 nla_nest_cancel(skb, nest); 484 return err; 485 } 486 487 nla_nest_end(skb, nest); 488 return 0; 489 } 490 491 static int ip_tun_fill_encap_info(struct sk_buff *skb, 492 struct lwtunnel_state *lwtstate) 493 { 494 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 495 496 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id, 497 LWTUNNEL_IP_PAD) || 498 nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) || 499 nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) || 500 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) || 501 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) || 502 nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) || 503 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info)) 504 return -ENOMEM; 505 506 return 0; 507 } 508 509 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info) 510 { 511 int opt_len; 512 513 if (!(info->key.tun_flags & 514 (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT))) 515 return 0; 516 517 opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */ 518 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) { 519 struct geneve_opt *opt = ip_tunnel_info_opts(info); 520 521 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_GENEVE */ 522 + nla_total_size(2) /* OPT_GENEVE_CLASS */ 523 + nla_total_size(1) /* OPT_GENEVE_TYPE */ 524 + nla_total_size(opt->length * 4); 525 /* OPT_GENEVE_DATA */ 526 } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) { 527 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */ 528 + nla_total_size(4); /* OPT_VXLAN_GBP */ 529 } 530 531 return opt_len; 532 } 533 534 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 535 { 536 return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */ 537 + nla_total_size(4) /* LWTUNNEL_IP_DST */ 538 + nla_total_size(4) /* LWTUNNEL_IP_SRC */ 539 + nla_total_size(1) /* LWTUNNEL_IP_TOS */ 540 + nla_total_size(1) /* LWTUNNEL_IP_TTL */ 541 + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */ 542 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 543 /* LWTUNNEL_IP_OPTS */ 544 } 545 546 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) 547 { 548 struct ip_tunnel_info *info_a = lwt_tun_info(a); 549 struct ip_tunnel_info *info_b = lwt_tun_info(b); 550 551 return memcmp(info_a, info_b, sizeof(info_a->key)) || 552 info_a->mode != info_b->mode || 553 info_a->options_len != info_b->options_len || 554 memcmp(ip_tunnel_info_opts(info_a), 555 ip_tunnel_info_opts(info_b), info_a->options_len); 556 } 557 558 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = { 559 .build_state = ip_tun_build_state, 560 .destroy_state = ip_tun_destroy_state, 561 .fill_encap = ip_tun_fill_encap_info, 562 .get_encap_size = ip_tun_encap_nlsize, 563 .cmp_encap = ip_tun_cmp_encap, 564 .owner = THIS_MODULE, 565 }; 566 567 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = { 568 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 }, 569 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) }, 570 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) }, 571 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 }, 572 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 }, 573 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 }, 574 }; 575 576 static int ip6_tun_build_state(struct nlattr *attr, 577 unsigned int family, const void *cfg, 578 struct lwtunnel_state **ts, 579 struct netlink_ext_ack *extack) 580 { 581 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1]; 582 struct lwtunnel_state *new_state; 583 struct ip_tunnel_info *tun_info; 584 int err, opt_len; 585 586 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr, 587 ip6_tun_policy, extack); 588 if (err < 0) 589 return err; 590 591 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack); 592 if (opt_len < 0) 593 return opt_len; 594 595 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 596 if (!new_state) 597 return -ENOMEM; 598 599 new_state->type = LWTUNNEL_ENCAP_IP6; 600 601 tun_info = lwt_tun_info(new_state); 602 603 err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack); 604 if (err < 0) { 605 lwtstate_free(new_state); 606 return err; 607 } 608 609 if (tb[LWTUNNEL_IP6_ID]) 610 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]); 611 612 if (tb[LWTUNNEL_IP6_DST]) 613 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]); 614 615 if (tb[LWTUNNEL_IP6_SRC]) 616 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]); 617 618 if (tb[LWTUNNEL_IP6_HOPLIMIT]) 619 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]); 620 621 if (tb[LWTUNNEL_IP6_TC]) 622 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]); 623 624 if (tb[LWTUNNEL_IP6_FLAGS]) 625 tun_info->key.tun_flags |= nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]); 626 627 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6; 628 tun_info->options_len = opt_len; 629 630 *ts = new_state; 631 632 return 0; 633 } 634 635 static int ip6_tun_fill_encap_info(struct sk_buff *skb, 636 struct lwtunnel_state *lwtstate) 637 { 638 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 639 640 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id, 641 LWTUNNEL_IP6_PAD) || 642 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) || 643 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) || 644 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) || 645 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) || 646 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) || 647 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info)) 648 return -ENOMEM; 649 650 return 0; 651 } 652 653 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 654 { 655 return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */ 656 + nla_total_size(16) /* LWTUNNEL_IP6_DST */ 657 + nla_total_size(16) /* LWTUNNEL_IP6_SRC */ 658 + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */ 659 + nla_total_size(1) /* LWTUNNEL_IP6_TC */ 660 + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */ 661 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 662 /* LWTUNNEL_IP6_OPTS */ 663 } 664 665 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = { 666 .build_state = ip6_tun_build_state, 667 .fill_encap = ip6_tun_fill_encap_info, 668 .get_encap_size = ip6_tun_encap_nlsize, 669 .cmp_encap = ip_tun_cmp_encap, 670 .owner = THIS_MODULE, 671 }; 672 673 void __init ip_tunnel_core_init(void) 674 { 675 /* If you land here, make sure whether increasing ip_tunnel_info's 676 * options_len is a reasonable choice with its usage in front ends 677 * (f.e., it's part of flow keys, etc). 678 */ 679 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255); 680 681 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP); 682 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6); 683 } 684 685 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); 686 EXPORT_SYMBOL(ip_tunnel_metadata_cnt); 687 688 void ip_tunnel_need_metadata(void) 689 { 690 static_branch_inc(&ip_tunnel_metadata_cnt); 691 } 692 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata); 693 694 void ip_tunnel_unneed_metadata(void) 695 { 696 static_branch_dec(&ip_tunnel_metadata_cnt); 697 } 698 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata); 699