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