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