1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2013 Nicira, Inc. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/types.h> 9 #include <linux/kernel.h> 10 #include <linux/skbuff.h> 11 #include <linux/netdevice.h> 12 #include <linux/in.h> 13 #include <linux/if_arp.h> 14 #include <linux/init.h> 15 #include <linux/in6.h> 16 #include <linux/inetdevice.h> 17 #include <linux/netfilter_ipv4.h> 18 #include <linux/etherdevice.h> 19 #include <linux/if_ether.h> 20 #include <linux/if_vlan.h> 21 #include <linux/static_key.h> 22 23 #include <net/ip.h> 24 #include <net/icmp.h> 25 #include <net/protocol.h> 26 #include <net/ip_tunnels.h> 27 #include <net/ip6_tunnel.h> 28 #include <net/arp.h> 29 #include <net/checksum.h> 30 #include <net/dsfield.h> 31 #include <net/inet_ecn.h> 32 #include <net/xfrm.h> 33 #include <net/net_namespace.h> 34 #include <net/netns/generic.h> 35 #include <net/rtnetlink.h> 36 #include <net/dst_metadata.h> 37 #include <net/geneve.h> 38 #include <net/vxlan.h> 39 #include <net/erspan.h> 40 41 const struct ip_tunnel_encap_ops __rcu * 42 iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; 43 EXPORT_SYMBOL(iptun_encaps); 44 45 const struct ip6_tnl_encap_ops __rcu * 46 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly; 47 EXPORT_SYMBOL(ip6tun_encaps); 48 49 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 50 __be32 src, __be32 dst, __u8 proto, 51 __u8 tos, __u8 ttl, __be16 df, bool xnet) 52 { 53 int pkt_len = skb->len - skb_inner_network_offset(skb); 54 struct net *net = dev_net(rt->dst.dev); 55 struct net_device *dev = skb->dev; 56 struct iphdr *iph; 57 int err; 58 59 skb_scrub_packet(skb, xnet); 60 61 skb_clear_hash_if_not_l4(skb); 62 skb_dst_set(skb, &rt->dst); 63 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 64 65 /* Push down and install the IP header. */ 66 skb_push(skb, sizeof(struct iphdr)); 67 skb_reset_network_header(skb); 68 69 iph = ip_hdr(skb); 70 71 iph->version = 4; 72 iph->ihl = sizeof(struct iphdr) >> 2; 73 iph->frag_off = ip_mtu_locked(&rt->dst) ? 0 : df; 74 iph->protocol = proto; 75 iph->tos = tos; 76 iph->daddr = dst; 77 iph->saddr = src; 78 iph->ttl = ttl; 79 __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1); 80 81 err = ip_local_out(net, sk, skb); 82 83 if (dev) { 84 if (unlikely(net_xmit_eval(err))) 85 pkt_len = 0; 86 iptunnel_xmit_stats(dev, pkt_len); 87 } 88 } 89 EXPORT_SYMBOL_GPL(iptunnel_xmit); 90 91 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 92 __be16 inner_proto, bool raw_proto, bool xnet) 93 { 94 if (unlikely(!pskb_may_pull(skb, hdr_len))) 95 return -ENOMEM; 96 97 skb_pull_rcsum(skb, hdr_len); 98 99 if (!raw_proto && inner_proto == htons(ETH_P_TEB)) { 100 struct ethhdr *eh; 101 102 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 103 return -ENOMEM; 104 105 eh = (struct ethhdr *)skb->data; 106 if (likely(eth_proto_is_802_3(eh->h_proto))) 107 skb->protocol = eh->h_proto; 108 else 109 skb->protocol = htons(ETH_P_802_2); 110 111 } else { 112 skb->protocol = inner_proto; 113 } 114 115 skb_clear_hash_if_not_l4(skb); 116 __vlan_hwaccel_clear_tag(skb); 117 skb_set_queue_mapping(skb, 0); 118 skb_scrub_packet(skb, xnet); 119 120 return iptunnel_pull_offloads(skb); 121 } 122 EXPORT_SYMBOL_GPL(__iptunnel_pull_header); 123 124 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, 125 gfp_t flags) 126 { 127 struct metadata_dst *res; 128 struct ip_tunnel_info *dst, *src; 129 130 if (!md || md->type != METADATA_IP_TUNNEL || 131 md->u.tun_info.mode & IP_TUNNEL_INFO_TX) 132 return NULL; 133 134 src = &md->u.tun_info; 135 res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags); 136 if (!res) 137 return NULL; 138 139 dst = &res->u.tun_info; 140 dst->key.tun_id = src->key.tun_id; 141 if (src->mode & IP_TUNNEL_INFO_IPV6) 142 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src, 143 sizeof(struct in6_addr)); 144 else 145 dst->key.u.ipv4.dst = src->key.u.ipv4.src; 146 dst->key.tun_flags = src->key.tun_flags; 147 dst->mode = src->mode | IP_TUNNEL_INFO_TX; 148 ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src), 149 src->options_len, 0); 150 151 return res; 152 } 153 EXPORT_SYMBOL_GPL(iptunnel_metadata_reply); 154 155 int iptunnel_handle_offloads(struct sk_buff *skb, 156 int gso_type_mask) 157 { 158 int err; 159 160 if (likely(!skb->encapsulation)) { 161 skb_reset_inner_headers(skb); 162 skb->encapsulation = 1; 163 } 164 165 if (skb_is_gso(skb)) { 166 err = skb_header_unclone(skb, GFP_ATOMIC); 167 if (unlikely(err)) 168 return err; 169 skb_shinfo(skb)->gso_type |= gso_type_mask; 170 return 0; 171 } 172 173 if (skb->ip_summed != CHECKSUM_PARTIAL) { 174 skb->ip_summed = CHECKSUM_NONE; 175 /* We clear encapsulation here to prevent badly-written 176 * drivers potentially deciding to offload an inner checksum 177 * if we set CHECKSUM_PARTIAL on the outer header. 178 * This should go away when the drivers are all fixed. 179 */ 180 skb->encapsulation = 0; 181 } 182 183 return 0; 184 } 185 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads); 186 187 /* Often modified stats are per cpu, other are shared (netdev->stats) */ 188 void ip_tunnel_get_stats64(struct net_device *dev, 189 struct rtnl_link_stats64 *tot) 190 { 191 int i; 192 193 netdev_stats_to_stats64(tot, &dev->stats); 194 195 for_each_possible_cpu(i) { 196 const struct pcpu_sw_netstats *tstats = 197 per_cpu_ptr(dev->tstats, i); 198 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 199 unsigned int start; 200 201 do { 202 start = u64_stats_fetch_begin_irq(&tstats->syncp); 203 rx_packets = tstats->rx_packets; 204 tx_packets = tstats->tx_packets; 205 rx_bytes = tstats->rx_bytes; 206 tx_bytes = tstats->tx_bytes; 207 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 208 209 tot->rx_packets += rx_packets; 210 tot->tx_packets += tx_packets; 211 tot->rx_bytes += rx_bytes; 212 tot->tx_bytes += tx_bytes; 213 } 214 } 215 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64); 216 217 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = { 218 [LWTUNNEL_IP_UNSPEC] = { .strict_start_type = LWTUNNEL_IP_OPTS }, 219 [LWTUNNEL_IP_ID] = { .type = NLA_U64 }, 220 [LWTUNNEL_IP_DST] = { .type = NLA_U32 }, 221 [LWTUNNEL_IP_SRC] = { .type = NLA_U32 }, 222 [LWTUNNEL_IP_TTL] = { .type = NLA_U8 }, 223 [LWTUNNEL_IP_TOS] = { .type = NLA_U8 }, 224 [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 }, 225 [LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED }, 226 }; 227 228 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = { 229 [LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED }, 230 [LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED }, 231 [LWTUNNEL_IP_OPTS_ERSPAN] = { .type = NLA_NESTED }, 232 }; 233 234 static const struct nla_policy 235 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = { 236 [LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 }, 237 [LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 }, 238 [LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 128 }, 239 }; 240 241 static const struct nla_policy 242 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = { 243 [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 }, 244 }; 245 246 static const struct nla_policy 247 erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = { 248 [LWTUNNEL_IP_OPT_ERSPAN_VER] = { .type = NLA_U8 }, 249 [LWTUNNEL_IP_OPT_ERSPAN_INDEX] = { .type = NLA_U32 }, 250 [LWTUNNEL_IP_OPT_ERSPAN_DIR] = { .type = NLA_U8 }, 251 [LWTUNNEL_IP_OPT_ERSPAN_HWID] = { .type = NLA_U8 }, 252 }; 253 254 static int ip_tun_parse_opts_geneve(struct nlattr *attr, 255 struct ip_tunnel_info *info, int opts_len, 256 struct netlink_ext_ack *extack) 257 { 258 struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1]; 259 int data_len, err; 260 261 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr, 262 geneve_opt_policy, extack); 263 if (err) 264 return err; 265 266 if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] || 267 !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] || 268 !tb[LWTUNNEL_IP_OPT_GENEVE_DATA]) 269 return -EINVAL; 270 271 attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA]; 272 data_len = nla_len(attr); 273 if (data_len % 4) 274 return -EINVAL; 275 276 if (info) { 277 struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len; 278 279 memcpy(opt->opt_data, nla_data(attr), data_len); 280 opt->length = data_len / 4; 281 attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS]; 282 opt->opt_class = nla_get_be16(attr); 283 attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE]; 284 opt->type = nla_get_u8(attr); 285 info->key.tun_flags |= TUNNEL_GENEVE_OPT; 286 } 287 288 return sizeof(struct geneve_opt) + data_len; 289 } 290 291 static int ip_tun_parse_opts_vxlan(struct nlattr *attr, 292 struct ip_tunnel_info *info, int opts_len, 293 struct netlink_ext_ack *extack) 294 { 295 struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1]; 296 int err; 297 298 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr, 299 vxlan_opt_policy, extack); 300 if (err) 301 return err; 302 303 if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP]) 304 return -EINVAL; 305 306 if (info) { 307 struct vxlan_metadata *md = 308 ip_tunnel_info_opts(info) + opts_len; 309 310 attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP]; 311 md->gbp = nla_get_u32(attr); 312 info->key.tun_flags |= TUNNEL_VXLAN_OPT; 313 } 314 315 return sizeof(struct vxlan_metadata); 316 } 317 318 static int ip_tun_parse_opts_erspan(struct nlattr *attr, 319 struct ip_tunnel_info *info, int opts_len, 320 struct netlink_ext_ack *extack) 321 { 322 struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1]; 323 int err; 324 u8 ver; 325 326 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr, 327 erspan_opt_policy, extack); 328 if (err) 329 return err; 330 331 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER]) 332 return -EINVAL; 333 334 ver = nla_get_u8(tb[LWTUNNEL_IP_OPT_ERSPAN_VER]); 335 if (ver == 1) { 336 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]) 337 return -EINVAL; 338 } else if (ver == 2) { 339 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] || 340 !tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]) 341 return -EINVAL; 342 } else { 343 return -EINVAL; 344 } 345 346 if (info) { 347 struct erspan_metadata *md = 348 ip_tunnel_info_opts(info) + opts_len; 349 350 md->version = ver; 351 if (ver == 1) { 352 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]; 353 md->u.index = nla_get_be32(attr); 354 } else { 355 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR]; 356 md->u.md2.dir = nla_get_u8(attr); 357 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]; 358 set_hwid(&md->u.md2, nla_get_u8(attr)); 359 } 360 361 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 362 } 363 364 return sizeof(struct erspan_metadata); 365 } 366 367 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info, 368 struct netlink_ext_ack *extack) 369 { 370 int err, rem, opt_len, opts_len = 0, type = 0; 371 struct nlattr *nla; 372 373 if (!attr) 374 return 0; 375 376 err = nla_validate(nla_data(attr), nla_len(attr), LWTUNNEL_IP_OPTS_MAX, 377 ip_opts_policy, extack); 378 if (err) 379 return err; 380 381 nla_for_each_attr(nla, nla_data(attr), nla_len(attr), rem) { 382 switch (nla_type(nla)) { 383 case LWTUNNEL_IP_OPTS_GENEVE: 384 if (type && type != TUNNEL_GENEVE_OPT) 385 return -EINVAL; 386 opt_len = ip_tun_parse_opts_geneve(nla, info, opts_len, 387 extack); 388 if (opt_len < 0) 389 return opt_len; 390 opts_len += opt_len; 391 if (opts_len > IP_TUNNEL_OPTS_MAX) 392 return -EINVAL; 393 type = TUNNEL_GENEVE_OPT; 394 break; 395 case LWTUNNEL_IP_OPTS_VXLAN: 396 if (type) 397 return -EINVAL; 398 opt_len = ip_tun_parse_opts_vxlan(nla, info, opts_len, 399 extack); 400 if (opt_len < 0) 401 return opt_len; 402 opts_len += opt_len; 403 type = TUNNEL_VXLAN_OPT; 404 break; 405 case LWTUNNEL_IP_OPTS_ERSPAN: 406 if (type) 407 return -EINVAL; 408 opt_len = ip_tun_parse_opts_erspan(nla, info, opts_len, 409 extack); 410 if (opt_len < 0) 411 return opt_len; 412 opts_len += opt_len; 413 type = TUNNEL_ERSPAN_OPT; 414 break; 415 default: 416 return -EINVAL; 417 } 418 } 419 420 return opts_len; 421 } 422 423 static int ip_tun_get_optlen(struct nlattr *attr, 424 struct netlink_ext_ack *extack) 425 { 426 return ip_tun_parse_opts(attr, NULL, extack); 427 } 428 429 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info, 430 struct netlink_ext_ack *extack) 431 { 432 return ip_tun_parse_opts(attr, info, extack); 433 } 434 435 static int ip_tun_build_state(struct net *net, struct nlattr *attr, 436 unsigned int family, const void *cfg, 437 struct lwtunnel_state **ts, 438 struct netlink_ext_ack *extack) 439 { 440 struct nlattr *tb[LWTUNNEL_IP_MAX + 1]; 441 struct lwtunnel_state *new_state; 442 struct ip_tunnel_info *tun_info; 443 int err, opt_len; 444 445 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr, 446 ip_tun_policy, extack); 447 if (err < 0) 448 return err; 449 450 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack); 451 if (opt_len < 0) 452 return opt_len; 453 454 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 455 if (!new_state) 456 return -ENOMEM; 457 458 new_state->type = LWTUNNEL_ENCAP_IP; 459 460 tun_info = lwt_tun_info(new_state); 461 462 err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack); 463 if (err < 0) { 464 lwtstate_free(new_state); 465 return err; 466 } 467 468 #ifdef CONFIG_DST_CACHE 469 err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL); 470 if (err) { 471 lwtstate_free(new_state); 472 return err; 473 } 474 #endif 475 476 if (tb[LWTUNNEL_IP_ID]) 477 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]); 478 479 if (tb[LWTUNNEL_IP_DST]) 480 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]); 481 482 if (tb[LWTUNNEL_IP_SRC]) 483 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]); 484 485 if (tb[LWTUNNEL_IP_TTL]) 486 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]); 487 488 if (tb[LWTUNNEL_IP_TOS]) 489 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]); 490 491 if (tb[LWTUNNEL_IP_FLAGS]) 492 tun_info->key.tun_flags |= 493 (nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) & 494 ~TUNNEL_OPTIONS_PRESENT); 495 496 tun_info->mode = IP_TUNNEL_INFO_TX; 497 tun_info->options_len = opt_len; 498 499 *ts = new_state; 500 501 return 0; 502 } 503 504 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate) 505 { 506 #ifdef CONFIG_DST_CACHE 507 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 508 509 dst_cache_destroy(&tun_info->dst_cache); 510 #endif 511 } 512 513 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb, 514 struct ip_tunnel_info *tun_info) 515 { 516 struct geneve_opt *opt; 517 struct nlattr *nest; 518 int offset = 0; 519 520 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE); 521 if (!nest) 522 return -ENOMEM; 523 524 while (tun_info->options_len > offset) { 525 opt = ip_tunnel_info_opts(tun_info) + offset; 526 if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS, 527 opt->opt_class) || 528 nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) || 529 nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4, 530 opt->opt_data)) { 531 nla_nest_cancel(skb, nest); 532 return -ENOMEM; 533 } 534 offset += sizeof(*opt) + opt->length * 4; 535 } 536 537 nla_nest_end(skb, nest); 538 return 0; 539 } 540 541 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb, 542 struct ip_tunnel_info *tun_info) 543 { 544 struct vxlan_metadata *md; 545 struct nlattr *nest; 546 547 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN); 548 if (!nest) 549 return -ENOMEM; 550 551 md = ip_tunnel_info_opts(tun_info); 552 if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) { 553 nla_nest_cancel(skb, nest); 554 return -ENOMEM; 555 } 556 557 nla_nest_end(skb, nest); 558 return 0; 559 } 560 561 static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb, 562 struct ip_tunnel_info *tun_info) 563 { 564 struct erspan_metadata *md; 565 struct nlattr *nest; 566 567 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN); 568 if (!nest) 569 return -ENOMEM; 570 571 md = ip_tunnel_info_opts(tun_info); 572 if (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version)) 573 goto err; 574 575 if (md->version == 1 && 576 nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index)) 577 goto err; 578 579 if (md->version == 2 && 580 (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) || 581 nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID, 582 get_hwid(&md->u.md2)))) 583 goto err; 584 585 nla_nest_end(skb, nest); 586 return 0; 587 err: 588 nla_nest_cancel(skb, nest); 589 return -ENOMEM; 590 } 591 592 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type, 593 struct ip_tunnel_info *tun_info) 594 { 595 struct nlattr *nest; 596 int err = 0; 597 598 if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT)) 599 return 0; 600 601 nest = nla_nest_start_noflag(skb, type); 602 if (!nest) 603 return -ENOMEM; 604 605 if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT) 606 err = ip_tun_fill_encap_opts_geneve(skb, tun_info); 607 else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT) 608 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info); 609 else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT) 610 err = ip_tun_fill_encap_opts_erspan(skb, tun_info); 611 612 if (err) { 613 nla_nest_cancel(skb, nest); 614 return err; 615 } 616 617 nla_nest_end(skb, nest); 618 return 0; 619 } 620 621 static int ip_tun_fill_encap_info(struct sk_buff *skb, 622 struct lwtunnel_state *lwtstate) 623 { 624 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 625 626 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id, 627 LWTUNNEL_IP_PAD) || 628 nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) || 629 nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) || 630 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) || 631 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) || 632 nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) || 633 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info)) 634 return -ENOMEM; 635 636 return 0; 637 } 638 639 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info) 640 { 641 int opt_len; 642 643 if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT)) 644 return 0; 645 646 opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */ 647 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) { 648 struct geneve_opt *opt; 649 int offset = 0; 650 651 opt_len += nla_total_size(0); /* LWTUNNEL_IP_OPTS_GENEVE */ 652 while (info->options_len > offset) { 653 opt = ip_tunnel_info_opts(info) + offset; 654 opt_len += nla_total_size(2) /* OPT_GENEVE_CLASS */ 655 + nla_total_size(1) /* OPT_GENEVE_TYPE */ 656 + nla_total_size(opt->length * 4); 657 /* OPT_GENEVE_DATA */ 658 offset += sizeof(*opt) + opt->length * 4; 659 } 660 } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) { 661 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */ 662 + nla_total_size(4); /* OPT_VXLAN_GBP */ 663 } else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) { 664 struct erspan_metadata *md = ip_tunnel_info_opts(info); 665 666 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */ 667 + nla_total_size(1) /* OPT_ERSPAN_VER */ 668 + (md->version == 1 ? nla_total_size(4) 669 /* OPT_ERSPAN_INDEX (v1) */ 670 : nla_total_size(1) + 671 nla_total_size(1)); 672 /* OPT_ERSPAN_DIR + HWID (v2) */ 673 } 674 675 return opt_len; 676 } 677 678 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 679 { 680 return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */ 681 + nla_total_size(4) /* LWTUNNEL_IP_DST */ 682 + nla_total_size(4) /* LWTUNNEL_IP_SRC */ 683 + nla_total_size(1) /* LWTUNNEL_IP_TOS */ 684 + nla_total_size(1) /* LWTUNNEL_IP_TTL */ 685 + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */ 686 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 687 /* LWTUNNEL_IP_OPTS */ 688 } 689 690 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) 691 { 692 struct ip_tunnel_info *info_a = lwt_tun_info(a); 693 struct ip_tunnel_info *info_b = lwt_tun_info(b); 694 695 return memcmp(info_a, info_b, sizeof(info_a->key)) || 696 info_a->mode != info_b->mode || 697 info_a->options_len != info_b->options_len || 698 memcmp(ip_tunnel_info_opts(info_a), 699 ip_tunnel_info_opts(info_b), info_a->options_len); 700 } 701 702 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = { 703 .build_state = ip_tun_build_state, 704 .destroy_state = ip_tun_destroy_state, 705 .fill_encap = ip_tun_fill_encap_info, 706 .get_encap_size = ip_tun_encap_nlsize, 707 .cmp_encap = ip_tun_cmp_encap, 708 .owner = THIS_MODULE, 709 }; 710 711 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = { 712 [LWTUNNEL_IP6_UNSPEC] = { .strict_start_type = LWTUNNEL_IP6_OPTS }, 713 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 }, 714 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) }, 715 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) }, 716 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 }, 717 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 }, 718 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 }, 719 [LWTUNNEL_IP6_OPTS] = { .type = NLA_NESTED }, 720 }; 721 722 static int ip6_tun_build_state(struct net *net, struct nlattr *attr, 723 unsigned int family, const void *cfg, 724 struct lwtunnel_state **ts, 725 struct netlink_ext_ack *extack) 726 { 727 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1]; 728 struct lwtunnel_state *new_state; 729 struct ip_tunnel_info *tun_info; 730 int err, opt_len; 731 732 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr, 733 ip6_tun_policy, extack); 734 if (err < 0) 735 return err; 736 737 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack); 738 if (opt_len < 0) 739 return opt_len; 740 741 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 742 if (!new_state) 743 return -ENOMEM; 744 745 new_state->type = LWTUNNEL_ENCAP_IP6; 746 747 tun_info = lwt_tun_info(new_state); 748 749 err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack); 750 if (err < 0) { 751 lwtstate_free(new_state); 752 return err; 753 } 754 755 if (tb[LWTUNNEL_IP6_ID]) 756 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]); 757 758 if (tb[LWTUNNEL_IP6_DST]) 759 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]); 760 761 if (tb[LWTUNNEL_IP6_SRC]) 762 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]); 763 764 if (tb[LWTUNNEL_IP6_HOPLIMIT]) 765 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]); 766 767 if (tb[LWTUNNEL_IP6_TC]) 768 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]); 769 770 if (tb[LWTUNNEL_IP6_FLAGS]) 771 tun_info->key.tun_flags |= 772 (nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) & 773 ~TUNNEL_OPTIONS_PRESENT); 774 775 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6; 776 tun_info->options_len = opt_len; 777 778 *ts = new_state; 779 780 return 0; 781 } 782 783 static int ip6_tun_fill_encap_info(struct sk_buff *skb, 784 struct lwtunnel_state *lwtstate) 785 { 786 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 787 788 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id, 789 LWTUNNEL_IP6_PAD) || 790 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) || 791 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) || 792 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) || 793 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) || 794 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) || 795 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info)) 796 return -ENOMEM; 797 798 return 0; 799 } 800 801 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 802 { 803 return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */ 804 + nla_total_size(16) /* LWTUNNEL_IP6_DST */ 805 + nla_total_size(16) /* LWTUNNEL_IP6_SRC */ 806 + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */ 807 + nla_total_size(1) /* LWTUNNEL_IP6_TC */ 808 + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */ 809 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 810 /* LWTUNNEL_IP6_OPTS */ 811 } 812 813 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = { 814 .build_state = ip6_tun_build_state, 815 .fill_encap = ip6_tun_fill_encap_info, 816 .get_encap_size = ip6_tun_encap_nlsize, 817 .cmp_encap = ip_tun_cmp_encap, 818 .owner = THIS_MODULE, 819 }; 820 821 void __init ip_tunnel_core_init(void) 822 { 823 /* If you land here, make sure whether increasing ip_tunnel_info's 824 * options_len is a reasonable choice with its usage in front ends 825 * (f.e., it's part of flow keys, etc). 826 */ 827 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255); 828 829 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP); 830 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6); 831 } 832 833 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); 834 EXPORT_SYMBOL(ip_tunnel_metadata_cnt); 835 836 void ip_tunnel_need_metadata(void) 837 { 838 static_branch_inc(&ip_tunnel_metadata_cnt); 839 } 840 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata); 841 842 void ip_tunnel_unneed_metadata(void) 843 { 844 static_branch_dec(&ip_tunnel_metadata_cnt); 845 } 846 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata); 847