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/ip6_checksum.h> 29 #include <net/arp.h> 30 #include <net/checksum.h> 31 #include <net/dsfield.h> 32 #include <net/inet_ecn.h> 33 #include <net/xfrm.h> 34 #include <net/net_namespace.h> 35 #include <net/netns/generic.h> 36 #include <net/rtnetlink.h> 37 #include <net/dst_metadata.h> 38 #include <net/geneve.h> 39 #include <net/vxlan.h> 40 #include <net/erspan.h> 41 42 const struct ip_tunnel_encap_ops __rcu * 43 iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; 44 EXPORT_SYMBOL(iptun_encaps); 45 46 const struct ip6_tnl_encap_ops __rcu * 47 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; 48 EXPORT_SYMBOL(ip6tun_encaps); 49 50 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 51 __be32 src, __be32 dst, __u8 proto, 52 __u8 tos, __u8 ttl, __be16 df, bool xnet, 53 u16 ipcb_flags) 54 { 55 int pkt_len = skb->len - skb_inner_network_offset(skb); 56 struct net *net = dev_net(rt->dst.dev); 57 struct net_device *dev = skb->dev; 58 struct iphdr *iph; 59 int err; 60 61 if (unlikely(dev_recursion_level() > IP_TUNNEL_RECURSION_LIMIT)) { 62 if (dev) { 63 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", 64 dev->name); 65 DEV_STATS_INC(dev, tx_errors); 66 } 67 ip_rt_put(rt); 68 kfree_skb(skb); 69 return; 70 } 71 72 dev_xmit_recursion_inc(); 73 74 skb_scrub_packet(skb, xnet); 75 76 skb_clear_hash_if_not_l4(skb); 77 skb_dst_set(skb, &rt->dst); 78 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 79 IPCB(skb)->flags = ipcb_flags; 80 81 /* Push down and install the IP header. */ 82 skb_push(skb, sizeof(struct iphdr)); 83 skb_reset_network_header(skb); 84 85 iph = ip_hdr(skb); 86 87 iph->version = 4; 88 iph->ihl = sizeof(struct iphdr) >> 2; 89 iph->frag_off = ip_mtu_locked(&rt->dst) ? 0 : df; 90 iph->protocol = proto; 91 iph->tos = tos; 92 iph->daddr = dst; 93 iph->saddr = src; 94 iph->ttl = ttl; 95 __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1); 96 97 err = ip_local_out(net, sk, skb); 98 99 if (dev) { 100 if (unlikely(net_xmit_eval(err))) 101 pkt_len = 0; 102 iptunnel_xmit_stats(dev, pkt_len); 103 } 104 105 dev_xmit_recursion_dec(); 106 } 107 EXPORT_SYMBOL_GPL(iptunnel_xmit); 108 109 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 110 __be16 inner_proto, bool raw_proto, bool xnet) 111 { 112 if (unlikely(!pskb_may_pull(skb, hdr_len))) 113 return -ENOMEM; 114 115 skb_pull_rcsum(skb, hdr_len); 116 117 if (!raw_proto && inner_proto == htons(ETH_P_TEB)) { 118 struct ethhdr *eh; 119 120 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 121 return -ENOMEM; 122 123 eh = (struct ethhdr *)skb->data; 124 if (likely(eth_proto_is_802_3(eh->h_proto))) 125 skb->protocol = eh->h_proto; 126 else 127 skb->protocol = htons(ETH_P_802_2); 128 129 } else { 130 skb->protocol = inner_proto; 131 } 132 133 skb_clear_hash_if_not_l4(skb); 134 __vlan_hwaccel_clear_tag(skb); 135 skb_set_queue_mapping(skb, 0); 136 skb_scrub_packet(skb, xnet); 137 138 return iptunnel_pull_offloads(skb); 139 } 140 EXPORT_SYMBOL_GPL(__iptunnel_pull_header); 141 142 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, 143 gfp_t flags) 144 { 145 IP_TUNNEL_DECLARE_FLAGS(tun_flags) = { }; 146 struct metadata_dst *res; 147 struct ip_tunnel_info *dst, *src; 148 149 if (!md || md->type != METADATA_IP_TUNNEL || 150 md->u.tun_info.mode & IP_TUNNEL_INFO_TX) 151 return NULL; 152 153 src = &md->u.tun_info; 154 res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags); 155 if (!res) 156 return NULL; 157 158 dst = &res->u.tun_info; 159 dst->key.tun_id = src->key.tun_id; 160 if (src->mode & IP_TUNNEL_INFO_IPV6) 161 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src, 162 sizeof(struct in6_addr)); 163 else 164 dst->key.u.ipv4.dst = src->key.u.ipv4.src; 165 ip_tunnel_flags_copy(dst->key.tun_flags, src->key.tun_flags); 166 dst->mode = src->mode | IP_TUNNEL_INFO_TX; 167 ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src), 168 src->options_len, tun_flags); 169 170 return res; 171 } 172 EXPORT_SYMBOL_GPL(iptunnel_metadata_reply); 173 174 int iptunnel_handle_offloads(struct sk_buff *skb, 175 int gso_type_mask) 176 { 177 int err; 178 179 if (likely(!skb->encapsulation)) { 180 skb_reset_inner_headers(skb); 181 skb->encapsulation = 1; 182 } 183 184 if (skb_is_gso(skb)) { 185 err = skb_header_unclone(skb, GFP_ATOMIC); 186 if (unlikely(err)) 187 return err; 188 skb_shinfo(skb)->gso_type |= gso_type_mask; 189 return 0; 190 } 191 192 if (skb->ip_summed != CHECKSUM_PARTIAL) { 193 skb->ip_summed = CHECKSUM_NONE; 194 /* We clear encapsulation here to prevent badly-written 195 * drivers potentially deciding to offload an inner checksum 196 * if we set CHECKSUM_PARTIAL on the outer header. 197 * This should go away when the drivers are all fixed. 198 */ 199 skb->encapsulation = 0; 200 } 201 202 return 0; 203 } 204 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); 205 206 /** 207 * iptunnel_pmtud_build_icmp() - Build ICMP error message for PMTUD 208 * @skb: Original packet with L2 header 209 * @mtu: MTU value for ICMP error 210 * 211 * Return: length on success, negative error code if message couldn't be built. 212 */ 213 static int iptunnel_pmtud_build_icmp(struct sk_buff *skb, int mtu) 214 { 215 const struct iphdr *iph = ip_hdr(skb); 216 struct icmphdr *icmph; 217 struct iphdr *niph; 218 struct ethhdr eh; 219 int len, err; 220 221 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct iphdr))) 222 return -EINVAL; 223 224 if (skb_is_gso(skb)) 225 skb_gso_reset(skb); 226 227 skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN); 228 pskb_pull(skb, ETH_HLEN); 229 skb_reset_network_header(skb); 230 231 err = pskb_trim(skb, 576 - sizeof(*niph) - sizeof(*icmph)); 232 if (err) 233 return err; 234 235 len = skb->len + sizeof(*icmph); 236 err = skb_cow(skb, sizeof(*niph) + sizeof(*icmph) + ETH_HLEN); 237 if (err) 238 return err; 239 240 icmph = skb_push(skb, sizeof(*icmph)); 241 *icmph = (struct icmphdr) { 242 .type = ICMP_DEST_UNREACH, 243 .code = ICMP_FRAG_NEEDED, 244 .checksum = 0, 245 .un.frag.__unused = 0, 246 .un.frag.mtu = htons(mtu), 247 }; 248 icmph->checksum = csum_fold(skb_checksum(skb, 0, len, 0)); 249 skb_reset_transport_header(skb); 250 251 niph = skb_push(skb, sizeof(*niph)); 252 *niph = (struct iphdr) { 253 .ihl = sizeof(*niph) / 4u, 254 .version = 4, 255 .tos = 0, 256 .tot_len = htons(len + sizeof(*niph)), 257 .id = 0, 258 .frag_off = htons(IP_DF), 259 .ttl = iph->ttl, 260 .protocol = IPPROTO_ICMP, 261 .saddr = iph->daddr, 262 .daddr = iph->saddr, 263 }; 264 ip_send_check(niph); 265 skb_reset_network_header(skb); 266 267 skb->ip_summed = CHECKSUM_NONE; 268 269 eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0); 270 skb_reset_mac_header(skb); 271 272 return skb->len; 273 } 274 275 /** 276 * iptunnel_pmtud_check_icmp() - Trigger ICMP reply if needed and allowed 277 * @skb: Buffer being sent by encapsulation, L2 headers expected 278 * @mtu: Network MTU for path 279 * 280 * Return: 0 for no ICMP reply, length if built, negative value on error. 281 */ 282 static int iptunnel_pmtud_check_icmp(struct sk_buff *skb, int mtu) 283 { 284 const struct icmphdr *icmph = icmp_hdr(skb); 285 const struct iphdr *iph = ip_hdr(skb); 286 287 if (mtu < 576 || iph->frag_off != htons(IP_DF)) 288 return 0; 289 290 if (ipv4_is_lbcast(iph->daddr) || ipv4_is_multicast(iph->daddr) || 291 ipv4_is_zeronet(iph->saddr) || ipv4_is_loopback(iph->saddr) || 292 ipv4_is_lbcast(iph->saddr) || ipv4_is_multicast(iph->saddr)) 293 return 0; 294 295 if (iph->protocol == IPPROTO_ICMP && icmp_is_err(icmph->type)) 296 return 0; 297 298 return iptunnel_pmtud_build_icmp(skb, mtu); 299 } 300 301 #if IS_ENABLED(CONFIG_IPV6) 302 /** 303 * iptunnel_pmtud_build_icmpv6() - Build ICMPv6 error message for PMTUD 304 * @skb: Original packet with L2 header 305 * @mtu: MTU value for ICMPv6 error 306 * 307 * Return: length on success, negative error code if message couldn't be built. 308 */ 309 static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb, int mtu) 310 { 311 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 312 struct icmp6hdr *icmp6h; 313 struct ipv6hdr *nip6h; 314 struct ethhdr eh; 315 int len, err; 316 __wsum csum; 317 318 if (!pskb_may_pull(skb, ETH_HLEN + sizeof(struct ipv6hdr))) 319 return -EINVAL; 320 321 if (skb_is_gso(skb)) 322 skb_gso_reset(skb); 323 324 skb_copy_bits(skb, skb_mac_offset(skb), &eh, ETH_HLEN); 325 pskb_pull(skb, ETH_HLEN); 326 skb_reset_network_header(skb); 327 328 err = pskb_trim(skb, IPV6_MIN_MTU - sizeof(*nip6h) - sizeof(*icmp6h)); 329 if (err) 330 return err; 331 332 len = skb->len + sizeof(*icmp6h); 333 err = skb_cow(skb, sizeof(*nip6h) + sizeof(*icmp6h) + ETH_HLEN); 334 if (err) 335 return err; 336 337 icmp6h = skb_push(skb, sizeof(*icmp6h)); 338 *icmp6h = (struct icmp6hdr) { 339 .icmp6_type = ICMPV6_PKT_TOOBIG, 340 .icmp6_code = 0, 341 .icmp6_cksum = 0, 342 .icmp6_mtu = htonl(mtu), 343 }; 344 skb_reset_transport_header(skb); 345 346 nip6h = skb_push(skb, sizeof(*nip6h)); 347 *nip6h = (struct ipv6hdr) { 348 .priority = 0, 349 .version = 6, 350 .flow_lbl = { 0 }, 351 .payload_len = htons(len), 352 .nexthdr = IPPROTO_ICMPV6, 353 .hop_limit = ip6h->hop_limit, 354 .saddr = ip6h->daddr, 355 .daddr = ip6h->saddr, 356 }; 357 skb_reset_network_header(skb); 358 359 csum = skb_checksum(skb, skb_transport_offset(skb), len, 0); 360 icmp6h->icmp6_cksum = csum_ipv6_magic(&nip6h->saddr, &nip6h->daddr, len, 361 IPPROTO_ICMPV6, csum); 362 363 skb->ip_summed = CHECKSUM_NONE; 364 365 eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0); 366 skb_reset_mac_header(skb); 367 368 return skb->len; 369 } 370 371 /** 372 * iptunnel_pmtud_check_icmpv6() - Trigger ICMPv6 reply if needed and allowed 373 * @skb: Buffer being sent by encapsulation, L2 headers expected 374 * @mtu: Network MTU for path 375 * 376 * Return: 0 for no ICMPv6 reply, length if built, negative value on error. 377 */ 378 static int iptunnel_pmtud_check_icmpv6(struct sk_buff *skb, int mtu) 379 { 380 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 381 int stype = ipv6_addr_type(&ip6h->saddr); 382 u8 proto = ip6h->nexthdr; 383 __be16 frag_off; 384 int offset; 385 386 if (mtu < IPV6_MIN_MTU) 387 return 0; 388 389 if (stype == IPV6_ADDR_ANY || stype == IPV6_ADDR_MULTICAST || 390 stype == IPV6_ADDR_LOOPBACK) 391 return 0; 392 393 offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto, 394 &frag_off); 395 if (offset < 0 || (frag_off & htons(~0x7))) 396 return 0; 397 398 if (proto == IPPROTO_ICMPV6) { 399 struct icmp6hdr *icmp6h; 400 401 if (!pskb_may_pull(skb, skb_network_header(skb) + 402 offset + 1 - skb->data)) 403 return 0; 404 405 icmp6h = (struct icmp6hdr *)(skb_network_header(skb) + offset); 406 if (icmpv6_is_err(icmp6h->icmp6_type) || 407 icmp6h->icmp6_type == NDISC_REDIRECT) 408 return 0; 409 } 410 411 return iptunnel_pmtud_build_icmpv6(skb, mtu); 412 } 413 #endif /* IS_ENABLED(CONFIG_IPV6) */ 414 415 /** 416 * skb_tunnel_check_pmtu() - Check, update PMTU and trigger ICMP reply as needed 417 * @skb: Buffer being sent by encapsulation, L2 headers expected 418 * @encap_dst: Destination for tunnel encapsulation (outer IP) 419 * @headroom: Encapsulation header size, bytes 420 * @reply: Build matching ICMP or ICMPv6 message as a result 421 * 422 * L2 tunnel implementations that can carry IP and can be directly bridged 423 * (currently UDP tunnels) can't always rely on IP forwarding paths to handle 424 * PMTU discovery. In the bridged case, ICMP or ICMPv6 messages need to be built 425 * based on payload and sent back by the encapsulation itself. 426 * 427 * For routable interfaces, we just need to update the PMTU for the destination. 428 * 429 * Return: 0 if ICMP error not needed, length if built, negative value on error 430 */ 431 int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst, 432 int headroom, bool reply) 433 { 434 u32 mtu = dst_mtu(encap_dst) - headroom; 435 436 if ((skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) || 437 (!skb_is_gso(skb) && (skb->len - skb_network_offset(skb)) <= mtu)) 438 return 0; 439 440 skb_dst_update_pmtu_no_confirm(skb, mtu); 441 442 if (!reply) 443 return 0; 444 445 if (skb->protocol == htons(ETH_P_IP)) 446 return iptunnel_pmtud_check_icmp(skb, mtu); 447 448 #if IS_ENABLED(CONFIG_IPV6) 449 if (skb->protocol == htons(ETH_P_IPV6)) 450 return iptunnel_pmtud_check_icmpv6(skb, mtu); 451 #endif 452 return 0; 453 } 454 EXPORT_SYMBOL(skb_tunnel_check_pmtu); 455 456 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = { 457 [LWTUNNEL_IP_UNSPEC] = { .strict_start_type = LWTUNNEL_IP_OPTS }, 458 [LWTUNNEL_IP_ID] = { .type = NLA_U64 }, 459 [LWTUNNEL_IP_DST] = { .type = NLA_U32 }, 460 [LWTUNNEL_IP_SRC] = { .type = NLA_U32 }, 461 [LWTUNNEL_IP_TTL] = { .type = NLA_U8 }, 462 [LWTUNNEL_IP_TOS] = { .type = NLA_U8 }, 463 [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 }, 464 [LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED }, 465 }; 466 467 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = { 468 [LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED }, 469 [LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED }, 470 [LWTUNNEL_IP_OPTS_ERSPAN] = { .type = NLA_NESTED }, 471 }; 472 473 static const struct nla_policy 474 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = { 475 [LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 }, 476 [LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 }, 477 [LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 127 }, 478 }; 479 480 static const struct nla_policy 481 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = { 482 [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 }, 483 }; 484 485 static const struct nla_policy 486 erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = { 487 [LWTUNNEL_IP_OPT_ERSPAN_VER] = { .type = NLA_U8 }, 488 [LWTUNNEL_IP_OPT_ERSPAN_INDEX] = { .type = NLA_U32 }, 489 [LWTUNNEL_IP_OPT_ERSPAN_DIR] = { .type = NLA_U8 }, 490 [LWTUNNEL_IP_OPT_ERSPAN_HWID] = { .type = NLA_U8 }, 491 }; 492 493 static int ip_tun_parse_opts_geneve(struct nlattr *attr, 494 struct ip_tunnel_info *info, int opts_len, 495 struct netlink_ext_ack *extack) 496 { 497 struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1]; 498 int data_len, err; 499 500 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr, 501 geneve_opt_policy, extack); 502 if (err) 503 return err; 504 505 if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] || 506 !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] || 507 !tb[LWTUNNEL_IP_OPT_GENEVE_DATA]) 508 return -EINVAL; 509 510 attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA]; 511 data_len = nla_len(attr); 512 if (data_len % 4) 513 return -EINVAL; 514 515 if (info) { 516 struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len; 517 518 memcpy(opt->opt_data, nla_data(attr), data_len); 519 opt->length = data_len / 4; 520 attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS]; 521 opt->opt_class = nla_get_be16(attr); 522 attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE]; 523 opt->type = nla_get_u8(attr); 524 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags); 525 } 526 527 return sizeof(struct geneve_opt) + data_len; 528 } 529 530 static int ip_tun_parse_opts_vxlan(struct nlattr *attr, 531 struct ip_tunnel_info *info, int opts_len, 532 struct netlink_ext_ack *extack) 533 { 534 struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1]; 535 int err; 536 537 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr, 538 vxlan_opt_policy, extack); 539 if (err) 540 return err; 541 542 if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP]) 543 return -EINVAL; 544 545 if (info) { 546 struct vxlan_metadata *md = 547 ip_tunnel_info_opts(info) + opts_len; 548 549 attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP]; 550 md->gbp = nla_get_u32(attr); 551 md->gbp &= VXLAN_GBP_MASK; 552 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags); 553 } 554 555 return sizeof(struct vxlan_metadata); 556 } 557 558 static int ip_tun_parse_opts_erspan(struct nlattr *attr, 559 struct ip_tunnel_info *info, int opts_len, 560 struct netlink_ext_ack *extack) 561 { 562 struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1]; 563 int err; 564 u8 ver; 565 566 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr, 567 erspan_opt_policy, extack); 568 if (err) 569 return err; 570 571 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER]) 572 return -EINVAL; 573 574 ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]); 575 if (ver == 1) { 576 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]) 577 return -EINVAL; 578 } else if (ver == 2) { 579 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] || 580 !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]) 581 return -EINVAL; 582 } else { 583 return -EINVAL; 584 } 585 586 if (info) { 587 struct erspan_metadata *md = 588 ip_tunnel_info_opts(info) + opts_len; 589 590 md->version = ver; 591 if (ver == 1) { 592 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]; 593 md->u.index = nla_get_be32(attr); 594 } else { 595 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR]; 596 md->u.md2.dir = nla_get_u8(attr); 597 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]; 598 set_hwid(&md->u.md2, nla_get_u8(attr)); 599 } 600 601 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags); 602 } 603 604 return sizeof(struct erspan_metadata); 605 } 606 607 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info, 608 struct netlink_ext_ack *extack) 609 { 610 int err, rem, opt_len, opts_len = 0; 611 struct nlattr *nla; 612 u32 type = 0; 613 614 if (!attr) 615 return 0; 616 617 err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX, 618 ip_opts_policy, extack); 619 if (err) 620 return err; 621 622 nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) { 623 switch (nla_type(nla)) { 624 case LWTUNNEL_IP_OPTS_GENEVE: 625 if (type && type != IP_TUNNEL_GENEVE_OPT_BIT) 626 return -EINVAL; 627 opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len, 628 extack); 629 if (opt_len < 0) 630 return opt_len; 631 opts_len += opt_len; 632 if (opts_len > IP_TUNNEL_OPTS_MAX) 633 return -EINVAL; 634 type = IP_TUNNEL_GENEVE_OPT_BIT; 635 break; 636 case LWTUNNEL_IP_OPTS_VXLAN: 637 if (type) 638 return -EINVAL; 639 opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len, 640 extack); 641 if (opt_len < 0) 642 return opt_len; 643 opts_len += opt_len; 644 type = IP_TUNNEL_VXLAN_OPT_BIT; 645 break; 646 case LWTUNNEL_IP_OPTS_ERSPAN: 647 if (type) 648 return -EINVAL; 649 opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len, 650 extack); 651 if (opt_len < 0) 652 return opt_len; 653 opts_len += opt_len; 654 type = IP_TUNNEL_ERSPAN_OPT_BIT; 655 break; 656 default: 657 return -EINVAL; 658 } 659 } 660 661 return opts_len; 662 } 663 664 static int ip_tun_get_optlen(struct nlattr *attr, 665 struct netlink_ext_ack *extack) 666 { 667 return ip_tun_parse_opts(attr, NULL, extack); 668 } 669 670 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info, 671 struct netlink_ext_ack *extack) 672 { 673 return ip_tun_parse_opts(attr, info, extack); 674 } 675 676 static int ip_tun_build_state(struct net *net, struct nlattr *attr, 677 unsigned int family, const void *cfg, 678 struct lwtunnel_state **ts, 679 struct netlink_ext_ack *extack) 680 { 681 struct nlattr *tb[LWTUNNEL_IP_MAX + 1]; 682 struct lwtunnel_state *new_state; 683 struct ip_tunnel_info *tun_info; 684 int err, opt_len; 685 686 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr, 687 ip_tun_policy, extack); 688 if (err < 0) 689 return err; 690 691 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack); 692 if (opt_len < 0) 693 return opt_len; 694 695 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 696 if (!new_state) 697 return -ENOMEM; 698 699 new_state->type = LWTUNNEL_ENCAP_IP; 700 701 tun_info = lwt_tun_info(new_state); 702 703 err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack); 704 if (err < 0) { 705 lwtstate_free(new_state); 706 return err; 707 } 708 709 #ifdef CONFIG_DST_CACHE 710 err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL); 711 if (err) { 712 lwtstate_free(new_state); 713 return err; 714 } 715 #endif 716 717 if (tb[LWTUNNEL_IP_ID]) 718 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]); 719 720 if (tb[LWTUNNEL_IP_DST]) 721 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]); 722 723 if (tb[LWTUNNEL_IP_SRC]) 724 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]); 725 726 if (tb[LWTUNNEL_IP_TTL]) 727 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]); 728 729 if (tb[LWTUNNEL_IP_TOS]) 730 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]); 731 732 if (tb[LWTUNNEL_IP_FLAGS]) { 733 IP_TUNNEL_DECLARE_FLAGS(flags); 734 735 ip_tunnel_flags_from_be16(flags, 736 nla_get_be16(tb[LWTUNNEL_IP_FLAGS])); 737 ip_tunnel_clear_options_present(flags); 738 739 ip_tunnel_flags_or(tun_info->key.tun_flags, 740 tun_info->key.tun_flags, flags); 741 } 742 743 tun_info->mode = IP_TUNNEL_INFO_TX; 744 tun_info->options_len = opt_len; 745 746 *ts = new_state; 747 748 return 0; 749 } 750 751 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate) 752 { 753 #ifdef CONFIG_DST_CACHE 754 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 755 756 dst_cache_destroy(&tun_info->dst_cache); 757 #endif 758 } 759 760 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb, 761 struct ip_tunnel_info *tun_info) 762 { 763 struct geneve_opt *opt; 764 struct nlattr *nest; 765 int offset = 0; 766 767 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE); 768 if (!nest) 769 return -ENOMEM; 770 771 while (tun_info->options_len > offset) { 772 opt = ip_tunnel_info_opts(tun_info) + offset; 773 if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS, 774 opt->opt_class) || 775 nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) || 776 nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4, 777 opt->opt_data)) { 778 nla_nest_cancel(skb, nest); 779 return -ENOMEM; 780 } 781 offset += sizeof(*opt) + opt->length * 4; 782 } 783 784 nla_nest_end(skb, nest); 785 return 0; 786 } 787 788 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb, 789 struct ip_tunnel_info *tun_info) 790 { 791 struct vxlan_metadata *md; 792 struct nlattr *nest; 793 794 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN); 795 if (!nest) 796 return -ENOMEM; 797 798 md = ip_tunnel_info_opts(tun_info); 799 if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) { 800 nla_nest_cancel(skb, nest); 801 return -ENOMEM; 802 } 803 804 nla_nest_end(skb, nest); 805 return 0; 806 } 807 808 static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb, 809 struct ip_tunnel_info *tun_info) 810 { 811 struct erspan_metadata *md; 812 struct nlattr *nest; 813 814 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN); 815 if (!nest) 816 return -ENOMEM; 817 818 md = ip_tunnel_info_opts(tun_info); 819 if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version)) 820 goto err; 821 822 if (md->version == 1 && 823 nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index)) 824 goto err; 825 826 if (md->version == 2 && 827 (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) || 828 nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID, 829 get_hwid(&md->u.md2)))) 830 goto err; 831 832 nla_nest_end(skb, nest); 833 return 0; 834 err: 835 nla_nest_cancel(skb, nest); 836 return -ENOMEM; 837 } 838 839 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type, 840 struct ip_tunnel_info *tun_info) 841 { 842 struct nlattr *nest; 843 int err = 0; 844 845 if (!ip_tunnel_is_options_present(tun_info->key.tun_flags)) 846 return 0; 847 848 nest = nla_nest_start_noflag(skb, type); 849 if (!nest) 850 return -ENOMEM; 851 852 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, tun_info->key.tun_flags)) 853 err = ip_tun_fill_encap_opts_geneve(skb, tun_info); 854 else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, tun_info->key.tun_flags)) 855 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info); 856 else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, tun_info->key.tun_flags)) 857 err = ip_tun_fill_encap_opts_erspan(skb, tun_info); 858 859 if (err) { 860 nla_nest_cancel(skb, nest); 861 return err; 862 } 863 864 nla_nest_end(skb, nest); 865 return 0; 866 } 867 868 static int ip_tun_fill_encap_info(struct sk_buff *skb, 869 struct lwtunnel_state *lwtstate) 870 { 871 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 872 873 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id, 874 LWTUNNEL_IP_PAD) || 875 nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) || 876 nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) || 877 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) || 878 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) || 879 nla_put_be16(skb, LWTUNNEL_IP_FLAGS, 880 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) || 881 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info)) 882 return -ENOMEM; 883 884 return 0; 885 } 886 887 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info) 888 { 889 int opt_len; 890 891 if (!ip_tunnel_is_options_present(info->key.tun_flags)) 892 return 0; 893 894 opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */ 895 if (test_bit(IP_TUNNEL_GENEVE_OPT_BIT, info->key.tun_flags)) { 896 struct geneve_opt *opt; 897 int offset = 0; 898 899 opt_len += nla_total_size(0); /* LWTUNNEL_IP_OPTS_GENEVE */ 900 while (info->options_len > offset) { 901 opt = ip_tunnel_info_opts(info) + offset; 902 opt_len += nla_total_size(2) /* OPT_GENEVE_CLASS */ 903 + nla_total_size(1) /* OPT_GENEVE_TYPE */ 904 + nla_total_size(opt->length * 4); 905 /* OPT_GENEVE_DATA */ 906 offset += sizeof(*opt) + opt->length * 4; 907 } 908 } else if (test_bit(IP_TUNNEL_VXLAN_OPT_BIT, info->key.tun_flags)) { 909 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */ 910 + nla_total_size(4); /* OPT_VXLAN_GBP */ 911 } else if (test_bit(IP_TUNNEL_ERSPAN_OPT_BIT, info->key.tun_flags)) { 912 struct erspan_metadata *md = ip_tunnel_info_opts(info); 913 914 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */ 915 + nla_total_size(1) /* OPT_ERSPAN_VER */ 916 + (md->version == 1 ? nla_total_size(4) 917 /* OPT_ERSPAN_INDEX (v1) */ 918 : nla_total_size(1) + 919 nla_total_size(1)); 920 /* OPT_ERSPAN_DIR + HWID (v2) */ 921 } 922 923 return opt_len; 924 } 925 926 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 927 { 928 return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */ 929 + nla_total_size(4) /* LWTUNNEL_IP_DST */ 930 + nla_total_size(4) /* LWTUNNEL_IP_SRC */ 931 + nla_total_size(1) /* LWTUNNEL_IP_TOS */ 932 + nla_total_size(1) /* LWTUNNEL_IP_TTL */ 933 + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */ 934 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 935 /* LWTUNNEL_IP_OPTS */ 936 } 937 938 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) 939 { 940 struct ip_tunnel_info *info_a = lwt_tun_info(a); 941 struct ip_tunnel_info *info_b = lwt_tun_info(b); 942 943 return memcmp(info_a, info_b, sizeof(info_a->key)) || 944 info_a->mode != info_b->mode || 945 info_a->options_len != info_b->options_len || 946 memcmp(ip_tunnel_info_opts(info_a), 947 ip_tunnel_info_opts(info_b), info_a->options_len); 948 } 949 950 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = { 951 .build_state = ip_tun_build_state, 952 .destroy_state = ip_tun_destroy_state, 953 .fill_encap = ip_tun_fill_encap_info, 954 .get_encap_size = ip_tun_encap_nlsize, 955 .cmp_encap = ip_tun_cmp_encap, 956 .owner = THIS_MODULE, 957 }; 958 959 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = { 960 [LWTUNNEL_IP6_UNSPEC] = { .strict_start_type = LWTUNNEL_IP6_OPTS }, 961 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 }, 962 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) }, 963 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) }, 964 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 }, 965 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 }, 966 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 }, 967 [LWTUNNEL_IP6_OPTS] = { .type = NLA_NESTED }, 968 }; 969 970 static int ip6_tun_build_state(struct net *net, struct nlattr *attr, 971 unsigned int family, const void *cfg, 972 struct lwtunnel_state **ts, 973 struct netlink_ext_ack *extack) 974 { 975 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1]; 976 struct lwtunnel_state *new_state; 977 struct ip_tunnel_info *tun_info; 978 int err, opt_len; 979 980 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr, 981 ip6_tun_policy, extack); 982 if (err < 0) 983 return err; 984 985 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack); 986 if (opt_len < 0) 987 return opt_len; 988 989 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 990 if (!new_state) 991 return -ENOMEM; 992 993 new_state->type = LWTUNNEL_ENCAP_IP6; 994 995 tun_info = lwt_tun_info(new_state); 996 997 err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack); 998 if (err < 0) { 999 lwtstate_free(new_state); 1000 return err; 1001 } 1002 1003 if (tb[LWTUNNEL_IP6_ID]) 1004 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]); 1005 1006 if (tb[LWTUNNEL_IP6_DST]) 1007 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]); 1008 1009 if (tb[LWTUNNEL_IP6_SRC]) 1010 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]); 1011 1012 if (tb[LWTUNNEL_IP6_HOPLIMIT]) 1013 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]); 1014 1015 if (tb[LWTUNNEL_IP6_TC]) 1016 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]); 1017 1018 if (tb[LWTUNNEL_IP6_FLAGS]) { 1019 IP_TUNNEL_DECLARE_FLAGS(flags); 1020 __be16 data; 1021 1022 data = nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]); 1023 ip_tunnel_flags_from_be16(flags, data); 1024 ip_tunnel_clear_options_present(flags); 1025 1026 ip_tunnel_flags_or(tun_info->key.tun_flags, 1027 tun_info->key.tun_flags, flags); 1028 } 1029 1030 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6; 1031 tun_info->options_len = opt_len; 1032 1033 *ts = new_state; 1034 1035 return 0; 1036 } 1037 1038 static int ip6_tun_fill_encap_info(struct sk_buff *skb, 1039 struct lwtunnel_state *lwtstate) 1040 { 1041 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 1042 1043 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id, 1044 LWTUNNEL_IP6_PAD) || 1045 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) || 1046 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) || 1047 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) || 1048 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) || 1049 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, 1050 ip_tunnel_flags_to_be16(tun_info->key.tun_flags)) || 1051 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info)) 1052 return -ENOMEM; 1053 1054 return 0; 1055 } 1056 1057 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 1058 { 1059 return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */ 1060 + nla_total_size(16) /* LWTUNNEL_IP6_DST */ 1061 + nla_total_size(16) /* LWTUNNEL_IP6_SRC */ 1062 + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */ 1063 + nla_total_size(1) /* LWTUNNEL_IP6_TC */ 1064 + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */ 1065 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 1066 /* LWTUNNEL_IP6_OPTS */ 1067 } 1068 1069 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = { 1070 .build_state = ip6_tun_build_state, 1071 .fill_encap = ip6_tun_fill_encap_info, 1072 .get_encap_size = ip6_tun_encap_nlsize, 1073 .cmp_encap = ip_tun_cmp_encap, 1074 .owner = THIS_MODULE, 1075 }; 1076 1077 void __init ip_tunnel_core_init(void) 1078 { 1079 /* If you land here, make sure whether increasing ip_tunnel_info's 1080 * options_len is a reasonable choice with its usage in front ends 1081 * (f.e., it's part of flow keys, etc). 1082 */ 1083 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255); 1084 1085 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP); 1086 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6); 1087 } 1088 1089 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); 1090 EXPORT_SYMBOL(ip_tunnel_metadata_cnt); 1091 1092 void ip_tunnel_need_metadata(void) 1093 { 1094 static_branch_inc(&ip_tunnel_metadata_cnt); 1095 } 1096 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata); 1097 1098 void ip_tunnel_unneed_metadata(void) 1099 { 1100 static_branch_dec(&ip_tunnel_metadata_cnt); 1101 } 1102 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata); 1103 1104 /* Returns either the correct skb->protocol value, or 0 if invalid. */ 1105 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb) 1106 { 1107 if (skb_network_header(skb) >= skb->head && 1108 (skb_network_header(skb) + sizeof(struct iphdr)) <= skb_tail_pointer(skb) && 1109 ip_hdr(skb)->version == 4) 1110 return htons(ETH_P_IP); 1111 if (skb_network_header(skb) >= skb->head && 1112 (skb_network_header(skb) + sizeof(struct ipv6hdr)) <= skb_tail_pointer(skb) && 1113 ipv6_hdr(skb)->version == 6) 1114 return htons(ETH_P_IPV6); 1115 return 0; 1116 } 1117 EXPORT_SYMBOL(ip_tunnel_parse_protocol); 1118 1119 const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol }; 1120 EXPORT_SYMBOL(ip_tunnel_header_ops); 1121 1122 /* This function returns true when ENCAP attributes are present in the nl msg */ 1123 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], 1124 struct ip_tunnel_encap *encap) 1125 { 1126 bool ret = false; 1127 1128 memset(encap, 0, sizeof(*encap)); 1129 1130 if (!data) 1131 return ret; 1132 1133 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1134 ret = true; 1135 encap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1136 } 1137 1138 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1139 ret = true; 1140 encap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1141 } 1142 1143 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1144 ret = true; 1145 encap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1146 } 1147 1148 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1149 ret = true; 1150 encap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1151 } 1152 1153 return ret; 1154 } 1155 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms); 1156 1157 void ip_tunnel_netlink_parms(struct nlattr *data[], 1158 struct ip_tunnel_parm_kern *parms) 1159 { 1160 if (data[IFLA_IPTUN_LINK]) 1161 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1162 1163 if (data[IFLA_IPTUN_LOCAL]) 1164 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1165 1166 if (data[IFLA_IPTUN_REMOTE]) 1167 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1168 1169 if (data[IFLA_IPTUN_TTL]) { 1170 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1171 if (parms->iph.ttl) 1172 parms->iph.frag_off = htons(IP_DF); 1173 } 1174 1175 if (data[IFLA_IPTUN_TOS]) 1176 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1177 1178 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1179 parms->iph.frag_off = htons(IP_DF); 1180 1181 if (data[IFLA_IPTUN_FLAGS]) { 1182 __be16 flags; 1183 1184 flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1185 ip_tunnel_flags_from_be16(parms->i_flags, flags); 1186 } 1187 1188 if (data[IFLA_IPTUN_PROTO]) 1189 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1190 } 1191 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_parms); 1192