1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __NET_IP_TUNNELS_H 3 #define __NET_IP_TUNNELS_H 1 4 5 #include <linux/if_tunnel.h> 6 #include <linux/netdevice.h> 7 #include <linux/skbuff.h> 8 #include <linux/socket.h> 9 #include <linux/types.h> 10 #include <linux/u64_stats_sync.h> 11 #include <linux/bitops.h> 12 13 #include <net/dsfield.h> 14 #include <net/flow.h> 15 #include <net/gro_cells.h> 16 #include <net/inet_dscp.h> 17 #include <net/inet_ecn.h> 18 #include <net/netns/generic.h> 19 #include <net/rtnetlink.h> 20 #include <net/lwtunnel.h> 21 #include <net/dst_cache.h> 22 #include <net/netdev_lock.h> 23 24 #if IS_ENABLED(CONFIG_IPV6) 25 #include <net/ipv6.h> 26 #include <net/ip6_fib.h> 27 #include <net/ip6_route.h> 28 #endif 29 30 /* Keep error state on tunnel for 30 sec */ 31 #define IPTUNNEL_ERR_TIMEO (30*HZ) 32 33 /* Used to memset ip_tunnel padding. */ 34 #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) 35 36 /* Used to memset ipv4 address padding. */ 37 #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst) 38 #define IP_TUNNEL_KEY_IPV4_PAD_LEN \ 39 (sizeof_field(struct ip_tunnel_key, u) - \ 40 sizeof_field(struct ip_tunnel_key, u.ipv4)) 41 42 #define __ipt_flag_op(op, ...) \ 43 op(__VA_ARGS__, __IP_TUNNEL_FLAG_NUM) 44 45 #define IP_TUNNEL_DECLARE_FLAGS(...) \ 46 __ipt_flag_op(DECLARE_BITMAP, __VA_ARGS__) 47 48 #define ip_tunnel_flags_zero(...) __ipt_flag_op(bitmap_zero, __VA_ARGS__) 49 #define ip_tunnel_flags_copy(...) __ipt_flag_op(bitmap_copy, __VA_ARGS__) 50 #define ip_tunnel_flags_and(...) __ipt_flag_op(bitmap_and, __VA_ARGS__) 51 #define ip_tunnel_flags_or(...) __ipt_flag_op(bitmap_or, __VA_ARGS__) 52 53 #define ip_tunnel_flags_empty(...) \ 54 __ipt_flag_op(bitmap_empty, __VA_ARGS__) 55 #define ip_tunnel_flags_intersect(...) \ 56 __ipt_flag_op(bitmap_intersects, __VA_ARGS__) 57 #define ip_tunnel_flags_subset(...) \ 58 __ipt_flag_op(bitmap_subset, __VA_ARGS__) 59 60 struct ip_tunnel_key { 61 __be64 tun_id; 62 union { 63 struct { 64 __be32 src; 65 __be32 dst; 66 } ipv4; 67 struct { 68 struct in6_addr src; 69 struct in6_addr dst; 70 } ipv6; 71 } u; 72 IP_TUNNEL_DECLARE_FLAGS(tun_flags); 73 __be32 label; /* Flow Label for IPv6 */ 74 u32 nhid; 75 u8 tos; /* TOS for IPv4, TC for IPv6 */ 76 u8 ttl; /* TTL for IPv4, HL for IPv6 */ 77 __be16 tp_src; 78 __be16 tp_dst; 79 __u8 flow_flags; 80 }; 81 82 struct ip_tunnel_encap { 83 u16 type; 84 u16 flags; 85 __be16 sport; 86 __be16 dport; 87 }; 88 89 /* Flags for ip_tunnel_info mode. */ 90 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */ 91 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */ 92 #define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */ 93 94 /* Maximum tunnel options length. */ 95 #define IP_TUNNEL_OPTS_MAX \ 96 GENMASK((sizeof_field(struct ip_tunnel_info, \ 97 options_len) * BITS_PER_BYTE) - 1, 0) 98 99 #define ip_tunnel_info_opts(info) \ 100 _Generic(info, \ 101 const struct ip_tunnel_info * : ((const void *)(info)->options),\ 102 struct ip_tunnel_info * : ((void *)(info)->options)\ 103 ) 104 105 struct ip_tunnel_info { 106 struct ip_tunnel_key key; 107 struct ip_tunnel_encap encap; 108 #ifdef CONFIG_DST_CACHE 109 struct dst_cache dst_cache; 110 #endif 111 u8 options_len; 112 u8 mode; 113 u8 options[] __aligned_largest __counted_by(options_len); 114 }; 115 116 /* 6rd prefix/relay information */ 117 #ifdef CONFIG_IPV6_SIT_6RD 118 struct ip_tunnel_6rd_parm { 119 struct in6_addr prefix; 120 __be32 relay_prefix; 121 u16 prefixlen; 122 u16 relay_prefixlen; 123 }; 124 #endif 125 126 struct ip_tunnel_prl_entry { 127 struct ip_tunnel_prl_entry __rcu *next; 128 __be32 addr; 129 u16 flags; 130 struct rcu_head rcu_head; 131 }; 132 133 struct metadata_dst; 134 135 /* Kernel-side variant of ip_tunnel_parm */ 136 struct ip_tunnel_parm_kern { 137 char name[IFNAMSIZ]; 138 IP_TUNNEL_DECLARE_FLAGS(i_flags); 139 IP_TUNNEL_DECLARE_FLAGS(o_flags); 140 __be32 i_key; 141 __be32 o_key; 142 int link; 143 struct iphdr iph; 144 }; 145 146 struct ip_tunnel { 147 struct ip_tunnel __rcu *next; 148 struct hlist_node hash_node; 149 150 struct net_device *dev; 151 netdevice_tracker dev_tracker; 152 153 struct net *net; /* netns for packet i/o */ 154 155 unsigned long err_time; /* Time when the last ICMP error 156 * arrived */ 157 int err_count; /* Number of arrived ICMP errors */ 158 159 /* These four fields used only by GRE */ 160 u32 i_seqno; /* The last seen seqno */ 161 atomic_t o_seqno; /* The last output seqno */ 162 int tun_hlen; /* Precalculated header length */ 163 164 /* These four fields used only by ERSPAN */ 165 u32 index; /* ERSPAN type II index */ 166 u8 erspan_ver; /* ERSPAN version */ 167 u8 dir; /* ERSPAN direction */ 168 u16 hwid; /* ERSPAN hardware ID */ 169 170 struct dst_cache dst_cache; 171 172 struct ip_tunnel_parm_kern parms; 173 174 int mlink; 175 int encap_hlen; /* Encap header length (FOU,GUE) */ 176 int hlen; /* tun_hlen + encap_hlen */ 177 struct ip_tunnel_encap encap; 178 179 /* for SIT */ 180 #ifdef CONFIG_IPV6_SIT_6RD 181 struct ip_tunnel_6rd_parm ip6rd; 182 #endif 183 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ 184 unsigned int prl_count; /* # of entries in PRL */ 185 unsigned int ip_tnl_net_id; 186 struct gro_cells gro_cells; 187 __u32 fwmark; 188 bool collect_md; 189 bool ignore_df; 190 }; 191 192 struct tnl_ptk_info { 193 IP_TUNNEL_DECLARE_FLAGS(flags); 194 __be16 proto; 195 __be32 key; 196 __be32 seq; 197 int hdr_len; 198 }; 199 200 #define PACKET_RCVD 0 201 #define PACKET_REJECT 1 202 #define PACKET_NEXT 2 203 204 #define IP_TNL_HASH_BITS 7 205 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) 206 207 struct ip_tunnel_net { 208 struct net_device *fb_tunnel_dev; 209 struct rtnl_link_ops *rtnl_link_ops; 210 struct hlist_head tunnels[IP_TNL_HASH_SIZE]; 211 struct ip_tunnel __rcu *collect_md_tun; 212 int type; 213 }; 214 215 static inline void ip_tunnel_set_options_present(unsigned long *flags) 216 { 217 IP_TUNNEL_DECLARE_FLAGS(present) = { }; 218 219 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); 220 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); 221 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); 222 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); 223 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); 224 225 ip_tunnel_flags_or(flags, flags, present); 226 } 227 228 static inline void ip_tunnel_clear_options_present(unsigned long *flags) 229 { 230 IP_TUNNEL_DECLARE_FLAGS(present) = { }; 231 232 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); 233 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); 234 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); 235 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); 236 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); 237 238 __ipt_flag_op(bitmap_andnot, flags, flags, present); 239 } 240 241 static inline bool ip_tunnel_is_options_present(const unsigned long *flags) 242 { 243 IP_TUNNEL_DECLARE_FLAGS(present) = { }; 244 245 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); 246 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); 247 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); 248 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); 249 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); 250 251 return ip_tunnel_flags_intersect(flags, present); 252 } 253 254 static inline bool ip_tunnel_flags_is_be16_compat(const unsigned long *flags) 255 { 256 IP_TUNNEL_DECLARE_FLAGS(supp) = { }; 257 258 bitmap_set(supp, 0, BITS_PER_TYPE(__be16)); 259 __set_bit(IP_TUNNEL_VTI_BIT, supp); 260 261 return ip_tunnel_flags_subset(flags, supp); 262 } 263 264 static inline void ip_tunnel_flags_from_be16(unsigned long *dst, __be16 flags) 265 { 266 ip_tunnel_flags_zero(dst); 267 268 bitmap_write(dst, be16_to_cpu(flags), 0, BITS_PER_TYPE(__be16)); 269 __assign_bit(IP_TUNNEL_VTI_BIT, dst, flags & VTI_ISVTI); 270 } 271 272 static inline __be16 ip_tunnel_flags_to_be16(const unsigned long *flags) 273 { 274 __be16 ret; 275 276 ret = cpu_to_be16(bitmap_read(flags, 0, BITS_PER_TYPE(__be16))); 277 if (test_bit(IP_TUNNEL_VTI_BIT, flags)) 278 ret |= VTI_ISVTI; 279 280 return ret; 281 } 282 283 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, 284 __be32 saddr, __be32 daddr, 285 u8 tos, u8 ttl, __be32 label, 286 __be16 tp_src, __be16 tp_dst, 287 __be64 tun_id, 288 const unsigned long *tun_flags) 289 { 290 key->tun_id = tun_id; 291 key->u.ipv4.src = saddr; 292 key->u.ipv4.dst = daddr; 293 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, 294 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); 295 key->tos = tos; 296 key->ttl = ttl; 297 key->label = label; 298 ip_tunnel_flags_copy(key->tun_flags, tun_flags); 299 300 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of 301 * the upper tunnel are used. 302 * E.g: GRE over IPSEC, the tp_src and tp_port are zero. 303 */ 304 key->tp_src = tp_src; 305 key->tp_dst = tp_dst; 306 307 /* Clear struct padding. */ 308 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) 309 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, 310 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE); 311 } 312 313 static inline bool 314 ip_tunnel_dst_cache_usable(const struct sk_buff *skb, 315 const struct ip_tunnel_info *info) 316 { 317 if (skb->mark) 318 return false; 319 320 return !info || !test_bit(IP_TUNNEL_NOCACHE_BIT, info->key.tun_flags); 321 } 322 323 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info 324 *tun_info) 325 { 326 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; 327 } 328 329 static inline __be64 key32_to_tunnel_id(__be32 key) 330 { 331 #ifdef __BIG_ENDIAN 332 return (__force __be64)key; 333 #else 334 return (__force __be64)((__force u64)key << 32); 335 #endif 336 } 337 338 /* Returns the least-significant 32 bits of a __be64. */ 339 static inline __be32 tunnel_id_to_key32(__be64 tun_id) 340 { 341 #ifdef __BIG_ENDIAN 342 return (__force __be32)tun_id; 343 #else 344 return (__force __be32)((__force u64)tun_id >> 32); 345 #endif 346 } 347 348 #ifdef CONFIG_INET 349 350 static inline void ip_tunnel_init_flow(struct flowi4 *fl4, 351 int proto, 352 __be32 daddr, __be32 saddr, 353 __be32 key, __u8 tos, 354 struct net *net, int oif, 355 __u32 mark, __u32 tun_inner_hash, 356 __u8 flow_flags) 357 { 358 memset(fl4, 0, sizeof(*fl4)); 359 360 if (oif) { 361 fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index(net, oif); 362 /* Legacy VRF/l3mdev use case */ 363 fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : oif; 364 } 365 366 fl4->daddr = daddr; 367 fl4->saddr = saddr; 368 fl4->flowi4_dscp = inet_dsfield_to_dscp(tos); 369 fl4->flowi4_proto = proto; 370 fl4->fl4_gre_key = key; 371 fl4->flowi4_mark = mark; 372 fl4->flowi4_multipath_hash = tun_inner_hash; 373 fl4->flowi4_flags = flow_flags; 374 } 375 376 int __ip_tunnel_init(struct net_device *dev); 377 #define ip_tunnel_init(DEV) \ 378 ({ \ 379 struct net_device *__dev = (DEV); \ 380 int __res = __ip_tunnel_init(__dev); \ 381 \ 382 if (!__res) \ 383 netdev_lockdep_set_classes(__dev);\ 384 __res; \ 385 }) 386 387 void ip_tunnel_uninit(struct net_device *dev); 388 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); 389 struct net *ip_tunnel_get_link_net(const struct net_device *dev); 390 int ip_tunnel_get_iflink(const struct net_device *dev); 391 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, 392 struct rtnl_link_ops *ops, char *devname); 393 void ip_tunnel_delete_net(struct net *net, unsigned int id, 394 struct rtnl_link_ops *ops, 395 struct list_head *dev_to_kill); 396 397 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 398 const struct iphdr *tnl_params, const u8 protocol); 399 void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 400 const u8 proto, int tunnel_hlen); 401 int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, 402 int cmd); 403 bool ip_tunnel_parm_from_user(struct ip_tunnel_parm_kern *kp, 404 const void __user *data); 405 bool ip_tunnel_parm_to_user(void __user *data, struct ip_tunnel_parm_kern *kp); 406 int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 407 void __user *data, int cmd); 408 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict); 409 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); 410 411 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, 412 int link, const unsigned long *flags, 413 __be32 remote, __be32 local, 414 __be32 key); 415 416 void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info); 417 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, 418 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 419 bool log_ecn_error); 420 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], 421 struct ip_tunnel_parm_kern *p, __u32 fwmark); 422 int ip_tunnel_newlink(struct net *net, struct net_device *dev, 423 struct nlattr *tb[], struct ip_tunnel_parm_kern *p, 424 __u32 fwmark); 425 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id); 426 427 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], 428 struct ip_tunnel_encap *encap); 429 430 void ip_tunnel_netlink_parms(struct nlattr *data[], 431 struct ip_tunnel_parm_kern *parms); 432 433 extern const struct header_ops ip_tunnel_header_ops; 434 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb); 435 436 struct ip_tunnel_encap_ops { 437 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 438 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 439 u8 *protocol, struct flowi4 *fl4); 440 int (*err_handler)(struct sk_buff *skb, u32 info); 441 }; 442 443 #define MAX_IPTUN_ENCAP_OPS 8 444 445 extern const struct ip_tunnel_encap_ops __rcu * 446 iptun_encaps[MAX_IPTUN_ENCAP_OPS]; 447 448 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, 449 unsigned int num); 450 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, 451 unsigned int num); 452 453 int ip_tunnel_encap_setup(struct ip_tunnel *t, 454 struct ip_tunnel_encap *ipencap); 455 456 static inline enum skb_drop_reason 457 pskb_inet_may_pull_reason(struct sk_buff *skb) 458 { 459 int nhlen; 460 461 switch (skb->protocol) { 462 #if IS_ENABLED(CONFIG_IPV6) 463 case htons(ETH_P_IPV6): 464 nhlen = sizeof(struct ipv6hdr); 465 break; 466 #endif 467 case htons(ETH_P_IP): 468 nhlen = sizeof(struct iphdr); 469 break; 470 default: 471 nhlen = 0; 472 } 473 474 return pskb_network_may_pull_reason(skb, nhlen); 475 } 476 477 static inline bool pskb_inet_may_pull(struct sk_buff *skb) 478 { 479 return pskb_inet_may_pull_reason(skb) == SKB_NOT_DROPPED_YET; 480 } 481 482 /* Variant of pskb_inet_may_pull(). 483 */ 484 static inline enum skb_drop_reason 485 skb_vlan_inet_prepare(struct sk_buff *skb, bool inner_proto_inherit) 486 { 487 int nhlen = 0, maclen = inner_proto_inherit ? 0 : ETH_HLEN; 488 __be16 type = skb->protocol; 489 enum skb_drop_reason reason; 490 491 /* Essentially this is skb_protocol(skb, true) 492 * And we get MAC len. 493 */ 494 if (eth_type_vlan(type)) 495 type = __vlan_get_protocol(skb, type, &maclen); 496 497 switch (type) { 498 #if IS_ENABLED(CONFIG_IPV6) 499 case htons(ETH_P_IPV6): 500 nhlen = sizeof(struct ipv6hdr); 501 break; 502 #endif 503 case htons(ETH_P_IP): 504 nhlen = sizeof(struct iphdr); 505 break; 506 } 507 /* For ETH_P_IPV6/ETH_P_IP we make sure to pull 508 * a base network header in skb->head. 509 */ 510 reason = pskb_may_pull_reason(skb, maclen + nhlen); 511 if (reason) 512 return reason; 513 514 skb_set_network_header(skb, maclen); 515 516 return SKB_NOT_DROPPED_YET; 517 } 518 519 static inline int ip_encap_hlen(struct ip_tunnel_encap *e) 520 { 521 const struct ip_tunnel_encap_ops *ops; 522 int hlen = -EINVAL; 523 524 if (e->type == TUNNEL_ENCAP_NONE) 525 return 0; 526 527 if (e->type >= MAX_IPTUN_ENCAP_OPS) 528 return -EINVAL; 529 530 rcu_read_lock(); 531 ops = rcu_dereference(iptun_encaps[e->type]); 532 if (likely(ops && ops->encap_hlen)) 533 hlen = ops->encap_hlen(e); 534 rcu_read_unlock(); 535 536 return hlen; 537 } 538 539 static inline int ip_tunnel_encap(struct sk_buff *skb, 540 struct ip_tunnel_encap *e, 541 u8 *protocol, struct flowi4 *fl4) 542 { 543 const struct ip_tunnel_encap_ops *ops; 544 int ret = -EINVAL; 545 546 if (e->type == TUNNEL_ENCAP_NONE) 547 return 0; 548 549 if (e->type >= MAX_IPTUN_ENCAP_OPS) 550 return -EINVAL; 551 552 rcu_read_lock(); 553 ops = rcu_dereference(iptun_encaps[e->type]); 554 if (likely(ops && ops->build_header)) 555 ret = ops->build_header(skb, e, protocol, fl4); 556 rcu_read_unlock(); 557 558 return ret; 559 } 560 561 /* Extract dsfield from inner protocol */ 562 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, 563 const struct sk_buff *skb) 564 { 565 __be16 payload_protocol = skb_protocol(skb, true); 566 567 if (payload_protocol == htons(ETH_P_IP)) 568 return iph->tos; 569 else if (payload_protocol == htons(ETH_P_IPV6)) 570 return ipv6_get_dsfield((const struct ipv6hdr *)iph); 571 else 572 return 0; 573 } 574 575 static inline __be32 ip_tunnel_get_flowlabel(const struct iphdr *iph, 576 const struct sk_buff *skb) 577 { 578 __be16 payload_protocol = skb_protocol(skb, true); 579 580 if (payload_protocol == htons(ETH_P_IPV6)) 581 return ip6_flowlabel((const struct ipv6hdr *)iph); 582 else 583 return 0; 584 } 585 586 static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph, 587 const struct sk_buff *skb) 588 { 589 __be16 payload_protocol = skb_protocol(skb, true); 590 591 if (payload_protocol == htons(ETH_P_IP)) 592 return iph->ttl; 593 else if (payload_protocol == htons(ETH_P_IPV6)) 594 return ((const struct ipv6hdr *)iph)->hop_limit; 595 else 596 return 0; 597 } 598 599 /* Propagate ECN bits out */ 600 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, 601 const struct sk_buff *skb) 602 { 603 u8 inner = ip_tunnel_get_dsfield(iph, skb); 604 605 return INET_ECN_encapsulate(tos, inner); 606 } 607 608 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 609 __be16 inner_proto, bool raw_proto, bool xnet); 610 611 static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 612 __be16 inner_proto, bool xnet) 613 { 614 return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet); 615 } 616 617 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 618 __be32 src, __be32 dst, u8 proto, 619 u8 tos, u8 ttl, __be16 df, bool xnet, u16 ipcb_flags); 620 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, 621 gfp_t flags); 622 int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst, 623 int headroom, bool reply); 624 625 static inline void ip_tunnel_adj_headroom(struct net_device *dev, 626 unsigned int headroom) 627 { 628 /* we must cap headroom to some upperlimit, else pskb_expand_head 629 * will overflow header offsets in skb_headers_offset_update(). 630 */ 631 const unsigned int max_allowed = 512; 632 633 if (headroom > max_allowed) 634 headroom = max_allowed; 635 636 if (headroom > READ_ONCE(dev->needed_headroom)) 637 WRITE_ONCE(dev->needed_headroom, headroom); 638 } 639 640 int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask); 641 642 static inline int iptunnel_pull_offloads(struct sk_buff *skb) 643 { 644 if (skb_is_gso(skb)) { 645 int err; 646 647 err = skb_unclone(skb, GFP_ATOMIC); 648 if (unlikely(err)) 649 return err; 650 skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >> 651 NETIF_F_GSO_SHIFT); 652 } 653 654 skb->encapsulation = 0; 655 return 0; 656 } 657 658 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len) 659 { 660 if (pkt_len > 0) { 661 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); 662 663 u64_stats_update_begin(&tstats->syncp); 664 u64_stats_add(&tstats->tx_bytes, pkt_len); 665 u64_stats_inc(&tstats->tx_packets); 666 u64_stats_update_end(&tstats->syncp); 667 put_cpu_ptr(tstats); 668 return; 669 } 670 671 if (pkt_len < 0) { 672 DEV_STATS_INC(dev, tx_errors); 673 DEV_STATS_INC(dev, tx_aborted_errors); 674 } else { 675 DEV_STATS_INC(dev, tx_dropped); 676 } 677 } 678 679 static inline void ip_tunnel_info_opts_get(void *to, 680 const struct ip_tunnel_info *info) 681 { 682 memcpy(to, ip_tunnel_info_opts(info), info->options_len); 683 } 684 685 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, 686 const void *from, int len, 687 const unsigned long *flags) 688 { 689 info->options_len = len; 690 if (len > 0) { 691 memcpy(ip_tunnel_info_opts(info), from, len); 692 ip_tunnel_flags_or(info->key.tun_flags, info->key.tun_flags, 693 flags); 694 } 695 } 696 697 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 698 { 699 return (struct ip_tunnel_info *)lwtstate->data; 700 } 701 702 DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); 703 704 /* Returns > 0 if metadata should be collected */ 705 static inline int ip_tunnel_collect_metadata(void) 706 { 707 return static_branch_unlikely(&ip_tunnel_metadata_cnt); 708 } 709 710 void __init ip_tunnel_core_init(void); 711 712 void ip_tunnel_need_metadata(void); 713 void ip_tunnel_unneed_metadata(void); 714 715 #else /* CONFIG_INET */ 716 717 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 718 { 719 return NULL; 720 } 721 722 static inline void ip_tunnel_need_metadata(void) 723 { 724 } 725 726 static inline void ip_tunnel_unneed_metadata(void) 727 { 728 } 729 730 static inline void ip_tunnel_info_opts_get(void *to, 731 const struct ip_tunnel_info *info) 732 { 733 } 734 735 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, 736 const void *from, int len, 737 const unsigned long *flags) 738 { 739 info->options_len = 0; 740 } 741 742 #endif /* CONFIG_INET */ 743 744 #endif /* __NET_IP_TUNNELS_H */ 745