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_ID] = { .type = NLA_U64 }, 219 [LWTUNNEL_IP_DST] = { .type = NLA_U32 }, 220 [LWTUNNEL_IP_SRC] = { .type = NLA_U32 }, 221 [LWTUNNEL_IP_TTL] = { .type = NLA_U8 }, 222 [LWTUNNEL_IP_TOS] = { .type = NLA_U8 }, 223 [LWTUNNEL_IP_FLAGS] = { .type = NLA_U16 }, 224 [LWTUNNEL_IP_OPTS] = { .type = NLA_NESTED }, 225 }; 226 227 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = { 228 [LWTUNNEL_IP_OPTS_GENEVE] = { .type = NLA_NESTED }, 229 [LWTUNNEL_IP_OPTS_VXLAN] = { .type = NLA_NESTED }, 230 [LWTUNNEL_IP_OPTS_ERSPAN] = { .type = NLA_NESTED }, 231 }; 232 233 static const struct nla_policy 234 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = { 235 [LWTUNNEL_IP_OPT_GENEVE_CLASS] = { .type = NLA_U16 }, 236 [LWTUNNEL_IP_OPT_GENEVE_TYPE] = { .type = NLA_U8 }, 237 [LWTUNNEL_IP_OPT_GENEVE_DATA] = { .type = NLA_BINARY, .len = 128 }, 238 }; 239 240 static const struct nla_policy 241 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = { 242 [LWTUNNEL_IP_OPT_VXLAN_GBP] = { .type = NLA_U32 }, 243 }; 244 245 static const struct nla_policy 246 erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = { 247 [LWTUNNEL_IP_OPT_ERSPAN_VER] = { .type = NLA_U8 }, 248 [LWTUNNEL_IP_OPT_ERSPAN_INDEX] = { .type = NLA_U32 }, 249 [LWTUNNEL_IP_OPT_ERSPAN_DIR] = { .type = NLA_U8 }, 250 [LWTUNNEL_IP_OPT_ERSPAN_HWID] = { .type = NLA_U8 }, 251 }; 252 253 static int ip_tun_parse_opts_geneve(struct nlattr *attr, 254 struct ip_tunnel_info *info, 255 struct netlink_ext_ack *extack) 256 { 257 struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1]; 258 int data_len, err; 259 260 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr, 261 geneve_opt_policy, extack); 262 if (err) 263 return err; 264 265 if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] || 266 !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] || 267 !tb[LWTUNNEL_IP_OPT_GENEVE_DATA]) 268 return -EINVAL; 269 270 attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA]; 271 data_len = nla_len(attr); 272 if (data_len % 4) 273 return -EINVAL; 274 275 if (info) { 276 struct geneve_opt *opt = ip_tunnel_info_opts(info); 277 278 memcpy(opt->opt_data, nla_data(attr), data_len); 279 opt->length = data_len / 4; 280 attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS]; 281 opt->opt_class = nla_get_be16(attr); 282 attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE]; 283 opt->type = nla_get_u8(attr); 284 info->key.tun_flags |= TUNNEL_GENEVE_OPT; 285 } 286 287 return sizeof(struct geneve_opt) + data_len; 288 } 289 290 static int ip_tun_parse_opts_vxlan(struct nlattr *attr, 291 struct ip_tunnel_info *info, 292 struct netlink_ext_ack *extack) 293 { 294 struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1]; 295 int err; 296 297 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr, 298 vxlan_opt_policy, extack); 299 if (err) 300 return err; 301 302 if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP]) 303 return -EINVAL; 304 305 if (info) { 306 struct vxlan_metadata *md = ip_tunnel_info_opts(info); 307 308 attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP]; 309 md->gbp = nla_get_u32(attr); 310 info->key.tun_flags |= TUNNEL_VXLAN_OPT; 311 } 312 313 return sizeof(struct vxlan_metadata); 314 } 315 316 static int ip_tun_parse_opts_erspan(struct nlattr *attr, 317 struct ip_tunnel_info *info, 318 struct netlink_ext_ack *extack) 319 { 320 struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1]; 321 int err; 322 323 err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr, 324 erspan_opt_policy, extack); 325 if (err) 326 return err; 327 328 if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER]) 329 return -EINVAL; 330 331 if (info) { 332 struct erspan_metadata *md = ip_tunnel_info_opts(info); 333 334 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_VER]; 335 md->version = nla_get_u8(attr); 336 337 if (md->version == 1 && tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]) { 338 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]; 339 md->u.index = nla_get_be32(attr); 340 } else if (md->version == 2 && tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] && 341 tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]) { 342 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR]; 343 md->u.md2.dir = nla_get_u8(attr); 344 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]; 345 set_hwid(&md->u.md2, nla_get_u8(attr)); 346 } else { 347 return -EINVAL; 348 } 349 350 info->key.tun_flags |= TUNNEL_ERSPAN_OPT; 351 } 352 353 return sizeof(struct erspan_metadata); 354 } 355 356 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info, 357 struct netlink_ext_ack *extack) 358 { 359 struct nlattr *tb[LWTUNNEL_IP_OPTS_MAX + 1]; 360 int err; 361 362 if (!attr) 363 return 0; 364 365 err = nla_parse_nested(tb, LWTUNNEL_IP_OPTS_MAX, attr, 366 ip_opts_policy, extack); 367 if (err) 368 return err; 369 370 if (tb[LWTUNNEL_IP_OPTS_GENEVE]) 371 err = ip_tun_parse_opts_geneve(tb[LWTUNNEL_IP_OPTS_GENEVE], 372 info, extack); 373 else if (tb[LWTUNNEL_IP_OPTS_VXLAN]) 374 err = ip_tun_parse_opts_vxlan(tb[LWTUNNEL_IP_OPTS_VXLAN], 375 info, extack); 376 else if (tb[LWTUNNEL_IP_OPTS_ERSPAN]) 377 err = ip_tun_parse_opts_erspan(tb[LWTUNNEL_IP_OPTS_ERSPAN], 378 info, extack); 379 else 380 err = -EINVAL; 381 382 return err; 383 } 384 385 static int ip_tun_get_optlen(struct nlattr *attr, 386 struct netlink_ext_ack *extack) 387 { 388 return ip_tun_parse_opts(attr, NULL, extack); 389 } 390 391 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info, 392 struct netlink_ext_ack *extack) 393 { 394 return ip_tun_parse_opts(attr, info, extack); 395 } 396 397 static int ip_tun_build_state(struct nlattr *attr, 398 unsigned int family, const void *cfg, 399 struct lwtunnel_state **ts, 400 struct netlink_ext_ack *extack) 401 { 402 struct nlattr *tb[LWTUNNEL_IP_MAX + 1]; 403 struct lwtunnel_state *new_state; 404 struct ip_tunnel_info *tun_info; 405 int err, opt_len; 406 407 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr, 408 ip_tun_policy, extack); 409 if (err < 0) 410 return err; 411 412 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack); 413 if (opt_len < 0) 414 return opt_len; 415 416 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 417 if (!new_state) 418 return -ENOMEM; 419 420 new_state->type = LWTUNNEL_ENCAP_IP; 421 422 tun_info = lwt_tun_info(new_state); 423 424 err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack); 425 if (err < 0) { 426 lwtstate_free(new_state); 427 return err; 428 } 429 430 #ifdef CONFIG_DST_CACHE 431 err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL); 432 if (err) { 433 lwtstate_free(new_state); 434 return err; 435 } 436 #endif 437 438 if (tb[LWTUNNEL_IP_ID]) 439 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]); 440 441 if (tb[LWTUNNEL_IP_DST]) 442 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]); 443 444 if (tb[LWTUNNEL_IP_SRC]) 445 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]); 446 447 if (tb[LWTUNNEL_IP_TTL]) 448 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]); 449 450 if (tb[LWTUNNEL_IP_TOS]) 451 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]); 452 453 if (tb[LWTUNNEL_IP_FLAGS]) 454 tun_info->key.tun_flags |= 455 (nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) & 456 ~TUNNEL_OPTIONS_PRESENT); 457 458 tun_info->mode = IP_TUNNEL_INFO_TX; 459 tun_info->options_len = opt_len; 460 461 *ts = new_state; 462 463 return 0; 464 } 465 466 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate) 467 { 468 #ifdef CONFIG_DST_CACHE 469 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 470 471 dst_cache_destroy(&tun_info->dst_cache); 472 #endif 473 } 474 475 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb, 476 struct ip_tunnel_info *tun_info) 477 { 478 struct geneve_opt *opt; 479 struct nlattr *nest; 480 481 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE); 482 if (!nest) 483 return -ENOMEM; 484 485 opt = ip_tunnel_info_opts(tun_info); 486 if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS, opt->opt_class) || 487 nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) || 488 nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4, 489 opt->opt_data)) { 490 nla_nest_cancel(skb, nest); 491 return -ENOMEM; 492 } 493 494 nla_nest_end(skb, nest); 495 return 0; 496 } 497 498 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb, 499 struct ip_tunnel_info *tun_info) 500 { 501 struct vxlan_metadata *md; 502 struct nlattr *nest; 503 504 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN); 505 if (!nest) 506 return -ENOMEM; 507 508 md = ip_tunnel_info_opts(tun_info); 509 if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) { 510 nla_nest_cancel(skb, nest); 511 return -ENOMEM; 512 } 513 514 nla_nest_end(skb, nest); 515 return 0; 516 } 517 518 static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb, 519 struct ip_tunnel_info *tun_info) 520 { 521 struct erspan_metadata *md; 522 struct nlattr *nest; 523 524 nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN); 525 if (!nest) 526 return -ENOMEM; 527 528 md = ip_tunnel_info_opts(tun_info); 529 if (nla_put_u32(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version)) 530 goto err; 531 532 if (md->version == 1 && 533 nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index)) 534 goto err; 535 536 if (md->version == 2 && 537 (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) || 538 nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID, 539 get_hwid(&md->u.md2)))) 540 goto err; 541 542 nla_nest_end(skb, nest); 543 return 0; 544 err: 545 nla_nest_cancel(skb, nest); 546 return -ENOMEM; 547 } 548 549 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type, 550 struct ip_tunnel_info *tun_info) 551 { 552 struct nlattr *nest; 553 int err = 0; 554 555 if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT)) 556 return 0; 557 558 nest = nla_nest_start_noflag(skb, type); 559 if (!nest) 560 return -ENOMEM; 561 562 if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT) 563 err = ip_tun_fill_encap_opts_geneve(skb, tun_info); 564 else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT) 565 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info); 566 else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT) 567 err = ip_tun_fill_encap_opts_erspan(skb, tun_info); 568 569 if (err) { 570 nla_nest_cancel(skb, nest); 571 return err; 572 } 573 574 nla_nest_end(skb, nest); 575 return 0; 576 } 577 578 static int ip_tun_fill_encap_info(struct sk_buff *skb, 579 struct lwtunnel_state *lwtstate) 580 { 581 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 582 583 if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id, 584 LWTUNNEL_IP_PAD) || 585 nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) || 586 nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) || 587 nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) || 588 nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) || 589 nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) || 590 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info)) 591 return -ENOMEM; 592 593 return 0; 594 } 595 596 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info) 597 { 598 int opt_len; 599 600 if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT)) 601 return 0; 602 603 opt_len = nla_total_size(0); /* LWTUNNEL_IP_OPTS */ 604 if (info->key.tun_flags & TUNNEL_GENEVE_OPT) { 605 struct geneve_opt *opt = ip_tunnel_info_opts(info); 606 607 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_GENEVE */ 608 + nla_total_size(2) /* OPT_GENEVE_CLASS */ 609 + nla_total_size(1) /* OPT_GENEVE_TYPE */ 610 + nla_total_size(opt->length * 4); 611 /* OPT_GENEVE_DATA */ 612 } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) { 613 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_VXLAN */ 614 + nla_total_size(4); /* OPT_VXLAN_GBP */ 615 } else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) { 616 struct erspan_metadata *md = ip_tunnel_info_opts(info); 617 618 opt_len += nla_total_size(0) /* LWTUNNEL_IP_OPTS_ERSPAN */ 619 + nla_total_size(1) /* OPT_ERSPAN_VER */ 620 + (md->version == 1 ? nla_total_size(4) 621 /* OPT_ERSPAN_INDEX (v1) */ 622 : nla_total_size(1) + 623 nla_total_size(1)); 624 /* OPT_ERSPAN_DIR + HWID (v2) */ 625 } 626 627 return opt_len; 628 } 629 630 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 631 { 632 return nla_total_size_64bit(8) /* LWTUNNEL_IP_ID */ 633 + nla_total_size(4) /* LWTUNNEL_IP_DST */ 634 + nla_total_size(4) /* LWTUNNEL_IP_SRC */ 635 + nla_total_size(1) /* LWTUNNEL_IP_TOS */ 636 + nla_total_size(1) /* LWTUNNEL_IP_TTL */ 637 + nla_total_size(2) /* LWTUNNEL_IP_FLAGS */ 638 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 639 /* LWTUNNEL_IP_OPTS */ 640 } 641 642 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b) 643 { 644 struct ip_tunnel_info *info_a = lwt_tun_info(a); 645 struct ip_tunnel_info *info_b = lwt_tun_info(b); 646 647 return memcmp(info_a, info_b, sizeof(info_a->key)) || 648 info_a->mode != info_b->mode || 649 info_a->options_len != info_b->options_len || 650 memcmp(ip_tunnel_info_opts(info_a), 651 ip_tunnel_info_opts(info_b), info_a->options_len); 652 } 653 654 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = { 655 .build_state = ip_tun_build_state, 656 .destroy_state = ip_tun_destroy_state, 657 .fill_encap = ip_tun_fill_encap_info, 658 .get_encap_size = ip_tun_encap_nlsize, 659 .cmp_encap = ip_tun_cmp_encap, 660 .owner = THIS_MODULE, 661 }; 662 663 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = { 664 [LWTUNNEL_IP6_ID] = { .type = NLA_U64 }, 665 [LWTUNNEL_IP6_DST] = { .len = sizeof(struct in6_addr) }, 666 [LWTUNNEL_IP6_SRC] = { .len = sizeof(struct in6_addr) }, 667 [LWTUNNEL_IP6_HOPLIMIT] = { .type = NLA_U8 }, 668 [LWTUNNEL_IP6_TC] = { .type = NLA_U8 }, 669 [LWTUNNEL_IP6_FLAGS] = { .type = NLA_U16 }, 670 }; 671 672 static int ip6_tun_build_state(struct nlattr *attr, 673 unsigned int family, const void *cfg, 674 struct lwtunnel_state **ts, 675 struct netlink_ext_ack *extack) 676 { 677 struct nlattr *tb[LWTUNNEL_IP6_MAX + 1]; 678 struct lwtunnel_state *new_state; 679 struct ip_tunnel_info *tun_info; 680 int err, opt_len; 681 682 err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr, 683 ip6_tun_policy, extack); 684 if (err < 0) 685 return err; 686 687 opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack); 688 if (opt_len < 0) 689 return opt_len; 690 691 new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len); 692 if (!new_state) 693 return -ENOMEM; 694 695 new_state->type = LWTUNNEL_ENCAP_IP6; 696 697 tun_info = lwt_tun_info(new_state); 698 699 err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack); 700 if (err < 0) { 701 lwtstate_free(new_state); 702 return err; 703 } 704 705 if (tb[LWTUNNEL_IP6_ID]) 706 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]); 707 708 if (tb[LWTUNNEL_IP6_DST]) 709 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]); 710 711 if (tb[LWTUNNEL_IP6_SRC]) 712 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]); 713 714 if (tb[LWTUNNEL_IP6_HOPLIMIT]) 715 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]); 716 717 if (tb[LWTUNNEL_IP6_TC]) 718 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]); 719 720 if (tb[LWTUNNEL_IP6_FLAGS]) 721 tun_info->key.tun_flags |= 722 (nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) & 723 ~TUNNEL_OPTIONS_PRESENT); 724 725 tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6; 726 tun_info->options_len = opt_len; 727 728 *ts = new_state; 729 730 return 0; 731 } 732 733 static int ip6_tun_fill_encap_info(struct sk_buff *skb, 734 struct lwtunnel_state *lwtstate) 735 { 736 struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate); 737 738 if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id, 739 LWTUNNEL_IP6_PAD) || 740 nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) || 741 nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) || 742 nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) || 743 nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) || 744 nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) || 745 ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info)) 746 return -ENOMEM; 747 748 return 0; 749 } 750 751 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate) 752 { 753 return nla_total_size_64bit(8) /* LWTUNNEL_IP6_ID */ 754 + nla_total_size(16) /* LWTUNNEL_IP6_DST */ 755 + nla_total_size(16) /* LWTUNNEL_IP6_SRC */ 756 + nla_total_size(1) /* LWTUNNEL_IP6_HOPLIMIT */ 757 + nla_total_size(1) /* LWTUNNEL_IP6_TC */ 758 + nla_total_size(2) /* LWTUNNEL_IP6_FLAGS */ 759 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate)); 760 /* LWTUNNEL_IP6_OPTS */ 761 } 762 763 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = { 764 .build_state = ip6_tun_build_state, 765 .fill_encap = ip6_tun_fill_encap_info, 766 .get_encap_size = ip6_tun_encap_nlsize, 767 .cmp_encap = ip_tun_cmp_encap, 768 .owner = THIS_MODULE, 769 }; 770 771 void __init ip_tunnel_core_init(void) 772 { 773 /* If you land here, make sure whether increasing ip_tunnel_info's 774 * options_len is a reasonable choice with its usage in front ends 775 * (f.e., it's part of flow keys, etc). 776 */ 777 BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255); 778 779 lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP); 780 lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6); 781 } 782 783 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); 784 EXPORT_SYMBOL(ip_tunnel_metadata_cnt); 785 786 void ip_tunnel_need_metadata(void) 787 { 788 static_branch_inc(&ip_tunnel_metadata_cnt); 789 } 790 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata); 791 792 void ip_tunnel_unneed_metadata(void) 793 { 794 static_branch_dec(&ip_tunnel_metadata_cnt); 795 } 796 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata); 797