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