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/gro_cells.h> 15 #include <net/inet_ecn.h> 16 #include <net/netns/generic.h> 17 #include <net/rtnetlink.h> 18 #include <net/lwtunnel.h> 19 #include <net/dst_cache.h> 20 21 #if IS_ENABLED(CONFIG_IPV6) 22 #include <net/ipv6.h> 23 #include <net/ip6_fib.h> 24 #include <net/ip6_route.h> 25 #endif 26 27 /* Keep error state on tunnel for 30 sec */ 28 #define IPTUNNEL_ERR_TIMEO (30*HZ) 29 30 /* Used to memset ip_tunnel padding. */ 31 #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) 32 33 /* Used to memset ipv4 address padding. */ 34 #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst) 35 #define IP_TUNNEL_KEY_IPV4_PAD_LEN \ 36 (sizeof_field(struct ip_tunnel_key, u) - \ 37 sizeof_field(struct ip_tunnel_key, u.ipv4)) 38 39 #define __ipt_flag_op(op, ...) \ 40 op(__VA_ARGS__, __IP_TUNNEL_FLAG_NUM) 41 42 #define IP_TUNNEL_DECLARE_FLAGS(...) \ 43 __ipt_flag_op(DECLARE_BITMAP, __VA_ARGS__) 44 45 #define ip_tunnel_flags_zero(...) __ipt_flag_op(bitmap_zero, __VA_ARGS__) 46 #define ip_tunnel_flags_copy(...) __ipt_flag_op(bitmap_copy, __VA_ARGS__) 47 #define ip_tunnel_flags_and(...) __ipt_flag_op(bitmap_and, __VA_ARGS__) 48 #define ip_tunnel_flags_or(...) __ipt_flag_op(bitmap_or, __VA_ARGS__) 49 50 #define ip_tunnel_flags_empty(...) \ 51 __ipt_flag_op(bitmap_empty, __VA_ARGS__) 52 #define ip_tunnel_flags_intersect(...) \ 53 __ipt_flag_op(bitmap_intersects, __VA_ARGS__) 54 #define ip_tunnel_flags_subset(...) \ 55 __ipt_flag_op(bitmap_subset, __VA_ARGS__) 56 57 struct ip_tunnel_key { 58 __be64 tun_id; 59 union { 60 struct { 61 __be32 src; 62 __be32 dst; 63 } ipv4; 64 struct { 65 struct in6_addr src; 66 struct in6_addr dst; 67 } ipv6; 68 } u; 69 IP_TUNNEL_DECLARE_FLAGS(tun_flags); 70 __be32 label; /* Flow Label for IPv6 */ 71 u32 nhid; 72 u8 tos; /* TOS for IPv4, TC for IPv6 */ 73 u8 ttl; /* TTL for IPv4, HL for IPv6 */ 74 __be16 tp_src; 75 __be16 tp_dst; 76 __u8 flow_flags; 77 }; 78 79 struct ip_tunnel_encap { 80 u16 type; 81 u16 flags; 82 __be16 sport; 83 __be16 dport; 84 }; 85 86 /* Flags for ip_tunnel_info mode. */ 87 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */ 88 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */ 89 #define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */ 90 91 /* Maximum tunnel options length. */ 92 #define IP_TUNNEL_OPTS_MAX \ 93 GENMASK((sizeof_field(struct ip_tunnel_info, \ 94 options_len) * BITS_PER_BYTE) - 1, 0) 95 96 #define ip_tunnel_info_opts(info) \ 97 _Generic(info, \ 98 const struct ip_tunnel_info * : ((const void *)(info)->options),\ 99 struct ip_tunnel_info * : ((void *)(info)->options)\ 100 ) 101 102 struct ip_tunnel_info { 103 struct ip_tunnel_key key; 104 struct ip_tunnel_encap encap; 105 #ifdef CONFIG_DST_CACHE 106 struct dst_cache dst_cache; 107 #endif 108 u8 options_len; 109 u8 mode; 110 u8 options[] __aligned_largest __counted_by(options_len); 111 }; 112 113 /* 6rd prefix/relay information */ 114 #ifdef CONFIG_IPV6_SIT_6RD 115 struct ip_tunnel_6rd_parm { 116 struct in6_addr prefix; 117 __be32 relay_prefix; 118 u16 prefixlen; 119 u16 relay_prefixlen; 120 }; 121 #endif 122 123 struct ip_tunnel_prl_entry { 124 struct ip_tunnel_prl_entry __rcu *next; 125 __be32 addr; 126 u16 flags; 127 struct rcu_head rcu_head; 128 }; 129 130 struct metadata_dst; 131 132 /* Kernel-side variant of ip_tunnel_parm */ 133 struct ip_tunnel_parm_kern { 134 char name[IFNAMSIZ]; 135 IP_TUNNEL_DECLARE_FLAGS(i_flags); 136 IP_TUNNEL_DECLARE_FLAGS(o_flags); 137 __be32 i_key; 138 __be32 o_key; 139 int link; 140 struct iphdr iph; 141 }; 142 143 struct ip_tunnel { 144 struct ip_tunnel __rcu *next; 145 struct hlist_node hash_node; 146 147 struct net_device *dev; 148 netdevice_tracker dev_tracker; 149 150 struct net *net; /* netns for packet i/o */ 151 152 unsigned long err_time; /* Time when the last ICMP error 153 * arrived */ 154 int err_count; /* Number of arrived ICMP errors */ 155 156 /* These four fields used only by GRE */ 157 u32 i_seqno; /* The last seen seqno */ 158 atomic_t o_seqno; /* The last output seqno */ 159 int tun_hlen; /* Precalculated header length */ 160 161 /* These four fields used only by ERSPAN */ 162 u32 index; /* ERSPAN type II index */ 163 u8 erspan_ver; /* ERSPAN version */ 164 u8 dir; /* ERSPAN direction */ 165 u16 hwid; /* ERSPAN hardware ID */ 166 167 struct dst_cache dst_cache; 168 169 struct ip_tunnel_parm_kern parms; 170 171 int mlink; 172 int encap_hlen; /* Encap header length (FOU,GUE) */ 173 int hlen; /* tun_hlen + encap_hlen */ 174 struct ip_tunnel_encap encap; 175 176 /* for SIT */ 177 #ifdef CONFIG_IPV6_SIT_6RD 178 struct ip_tunnel_6rd_parm ip6rd; 179 #endif 180 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ 181 unsigned int prl_count; /* # of entries in PRL */ 182 unsigned int ip_tnl_net_id; 183 struct gro_cells gro_cells; 184 __u32 fwmark; 185 bool collect_md; 186 bool ignore_df; 187 }; 188 189 struct tnl_ptk_info { 190 IP_TUNNEL_DECLARE_FLAGS(flags); 191 __be16 proto; 192 __be32 key; 193 __be32 seq; 194 int hdr_len; 195 }; 196 197 #define PACKET_RCVD 0 198 #define PACKET_REJECT 1 199 #define PACKET_NEXT 2 200 201 #define IP_TNL_HASH_BITS 7 202 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) 203 204 struct ip_tunnel_net { 205 struct net_device *fb_tunnel_dev; 206 struct rtnl_link_ops *rtnl_link_ops; 207 struct hlist_head tunnels[IP_TNL_HASH_SIZE]; 208 struct ip_tunnel __rcu *collect_md_tun; 209 int type; 210 }; 211 212 static inline void ip_tunnel_set_options_present(unsigned long *flags) 213 { 214 IP_TUNNEL_DECLARE_FLAGS(present) = { }; 215 216 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); 217 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); 218 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); 219 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); 220 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); 221 222 ip_tunnel_flags_or(flags, flags, present); 223 } 224 225 static inline void ip_tunnel_clear_options_present(unsigned long *flags) 226 { 227 IP_TUNNEL_DECLARE_FLAGS(present) = { }; 228 229 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); 230 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); 231 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); 232 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); 233 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); 234 235 __ipt_flag_op(bitmap_andnot, flags, flags, present); 236 } 237 238 static inline bool ip_tunnel_is_options_present(const unsigned long *flags) 239 { 240 IP_TUNNEL_DECLARE_FLAGS(present) = { }; 241 242 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); 243 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); 244 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); 245 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); 246 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); 247 248 return ip_tunnel_flags_intersect(flags, present); 249 } 250 251 static inline bool ip_tunnel_flags_is_be16_compat(const unsigned long *flags) 252 { 253 IP_TUNNEL_DECLARE_FLAGS(supp) = { }; 254 255 bitmap_set(supp, 0, BITS_PER_TYPE(__be16)); 256 __set_bit(IP_TUNNEL_VTI_BIT, supp); 257 258 return ip_tunnel_flags_subset(flags, supp); 259 } 260 261 static inline void ip_tunnel_flags_from_be16(unsigned long *dst, __be16 flags) 262 { 263 ip_tunnel_flags_zero(dst); 264 265 bitmap_write(dst, be16_to_cpu(flags), 0, BITS_PER_TYPE(__be16)); 266 __assign_bit(IP_TUNNEL_VTI_BIT, dst, flags & VTI_ISVTI); 267 } 268 269 static inline __be16 ip_tunnel_flags_to_be16(const unsigned long *flags) 270 { 271 __be16 ret; 272 273 ret = cpu_to_be16(bitmap_read(flags, 0, BITS_PER_TYPE(__be16))); 274 if (test_bit(IP_TUNNEL_VTI_BIT, flags)) 275 ret |= VTI_ISVTI; 276 277 return ret; 278 } 279 280 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, 281 __be32 saddr, __be32 daddr, 282 u8 tos, u8 ttl, __be32 label, 283 __be16 tp_src, __be16 tp_dst, 284 __be64 tun_id, 285 const unsigned long *tun_flags) 286 { 287 key->tun_id = tun_id; 288 key->u.ipv4.src = saddr; 289 key->u.ipv4.dst = daddr; 290 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, 291 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); 292 key->tos = tos; 293 key->ttl = ttl; 294 key->label = label; 295 ip_tunnel_flags_copy(key->tun_flags, tun_flags); 296 297 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of 298 * the upper tunnel are used. 299 * E.g: GRE over IPSEC, the tp_src and tp_port are zero. 300 */ 301 key->tp_src = tp_src; 302 key->tp_dst = tp_dst; 303 304 /* Clear struct padding. */ 305 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) 306 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, 307 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE); 308 } 309 310 static inline bool 311 ip_tunnel_dst_cache_usable(const struct sk_buff *skb, 312 const struct ip_tunnel_info *info) 313 { 314 if (skb->mark) 315 return false; 316 317 return !info || !test_bit(IP_TUNNEL_NOCACHE_BIT, info->key.tun_flags); 318 } 319 320 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info 321 *tun_info) 322 { 323 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; 324 } 325 326 static inline __be64 key32_to_tunnel_id(__be32 key) 327 { 328 #ifdef __BIG_ENDIAN 329 return (__force __be64)key; 330 #else 331 return (__force __be64)((__force u64)key << 32); 332 #endif 333 } 334 335 /* Returns the least-significant 32 bits of a __be64. */ 336 static inline __be32 tunnel_id_to_key32(__be64 tun_id) 337 { 338 #ifdef __BIG_ENDIAN 339 return (__force __be32)tun_id; 340 #else 341 return (__force __be32)((__force u64)tun_id >> 32); 342 #endif 343 } 344 345 #ifdef CONFIG_INET 346 347 static inline void ip_tunnel_init_flow(struct flowi4 *fl4, 348 int proto, 349 __be32 daddr, __be32 saddr, 350 __be32 key, __u8 tos, 351 struct net *net, int oif, 352 __u32 mark, __u32 tun_inner_hash, 353 __u8 flow_flags) 354 { 355 memset(fl4, 0, sizeof(*fl4)); 356 357 if (oif) { 358 fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index(net, oif); 359 /* Legacy VRF/l3mdev use case */ 360 fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : oif; 361 } 362 363 fl4->daddr = daddr; 364 fl4->saddr = saddr; 365 fl4->flowi4_tos = tos; 366 fl4->flowi4_proto = proto; 367 fl4->fl4_gre_key = key; 368 fl4->flowi4_mark = mark; 369 fl4->flowi4_multipath_hash = tun_inner_hash; 370 fl4->flowi4_flags = flow_flags; 371 } 372 373 int ip_tunnel_init(struct net_device *dev); 374 void ip_tunnel_uninit(struct net_device *dev); 375 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); 376 struct net *ip_tunnel_get_link_net(const struct net_device *dev); 377 int ip_tunnel_get_iflink(const struct net_device *dev); 378 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, 379 struct rtnl_link_ops *ops, char *devname); 380 void ip_tunnel_delete_net(struct net *net, unsigned int id, 381 struct rtnl_link_ops *ops, 382 struct list_head *dev_to_kill); 383 384 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 385 const struct iphdr *tnl_params, const u8 protocol); 386 void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 387 const u8 proto, int tunnel_hlen); 388 int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, 389 int cmd); 390 bool ip_tunnel_parm_from_user(struct ip_tunnel_parm_kern *kp, 391 const void __user *data); 392 bool ip_tunnel_parm_to_user(void __user *data, struct ip_tunnel_parm_kern *kp); 393 int ip_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 394 void __user *data, int cmd); 395 int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict); 396 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); 397 398 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, 399 int link, const unsigned long *flags, 400 __be32 remote, __be32 local, 401 __be32 key); 402 403 void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info); 404 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, 405 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 406 bool log_ecn_error); 407 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], 408 struct ip_tunnel_parm_kern *p, __u32 fwmark); 409 int ip_tunnel_newlink(struct net *net, struct net_device *dev, 410 struct nlattr *tb[], struct ip_tunnel_parm_kern *p, 411 __u32 fwmark); 412 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id); 413 414 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], 415 struct ip_tunnel_encap *encap); 416 417 void ip_tunnel_netlink_parms(struct nlattr *data[], 418 struct ip_tunnel_parm_kern *parms); 419 420 extern const struct header_ops ip_tunnel_header_ops; 421 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb); 422 423 struct ip_tunnel_encap_ops { 424 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 425 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 426 u8 *protocol, struct flowi4 *fl4); 427 int (*err_handler)(struct sk_buff *skb, u32 info); 428 }; 429 430 #define MAX_IPTUN_ENCAP_OPS 8 431 432 extern const struct ip_tunnel_encap_ops __rcu * 433 iptun_encaps[MAX_IPTUN_ENCAP_OPS]; 434 435 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, 436 unsigned int num); 437 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, 438 unsigned int num); 439 440 int ip_tunnel_encap_setup(struct ip_tunnel *t, 441 struct ip_tunnel_encap *ipencap); 442 443 static inline enum skb_drop_reason 444 pskb_inet_may_pull_reason(struct sk_buff *skb) 445 { 446 int nhlen; 447 448 switch (skb->protocol) { 449 #if IS_ENABLED(CONFIG_IPV6) 450 case htons(ETH_P_IPV6): 451 nhlen = sizeof(struct ipv6hdr); 452 break; 453 #endif 454 case htons(ETH_P_IP): 455 nhlen = sizeof(struct iphdr); 456 break; 457 default: 458 nhlen = 0; 459 } 460 461 return pskb_network_may_pull_reason(skb, nhlen); 462 } 463 464 static inline bool pskb_inet_may_pull(struct sk_buff *skb) 465 { 466 return pskb_inet_may_pull_reason(skb) == SKB_NOT_DROPPED_YET; 467 } 468 469 /* Variant of pskb_inet_may_pull(). 470 */ 471 static inline enum skb_drop_reason 472 skb_vlan_inet_prepare(struct sk_buff *skb, bool inner_proto_inherit) 473 { 474 int nhlen = 0, maclen = inner_proto_inherit ? 0 : ETH_HLEN; 475 __be16 type = skb->protocol; 476 enum skb_drop_reason reason; 477 478 /* Essentially this is skb_protocol(skb, true) 479 * And we get MAC len. 480 */ 481 if (eth_type_vlan(type)) 482 type = __vlan_get_protocol(skb, type, &maclen); 483 484 switch (type) { 485 #if IS_ENABLED(CONFIG_IPV6) 486 case htons(ETH_P_IPV6): 487 nhlen = sizeof(struct ipv6hdr); 488 break; 489 #endif 490 case htons(ETH_P_IP): 491 nhlen = sizeof(struct iphdr); 492 break; 493 } 494 /* For ETH_P_IPV6/ETH_P_IP we make sure to pull 495 * a base network header in skb->head. 496 */ 497 reason = pskb_may_pull_reason(skb, maclen + nhlen); 498 if (reason) 499 return reason; 500 501 skb_set_network_header(skb, maclen); 502 503 return SKB_NOT_DROPPED_YET; 504 } 505 506 static inline int ip_encap_hlen(struct ip_tunnel_encap *e) 507 { 508 const struct ip_tunnel_encap_ops *ops; 509 int hlen = -EINVAL; 510 511 if (e->type == TUNNEL_ENCAP_NONE) 512 return 0; 513 514 if (e->type >= MAX_IPTUN_ENCAP_OPS) 515 return -EINVAL; 516 517 rcu_read_lock(); 518 ops = rcu_dereference(iptun_encaps[e->type]); 519 if (likely(ops && ops->encap_hlen)) 520 hlen = ops->encap_hlen(e); 521 rcu_read_unlock(); 522 523 return hlen; 524 } 525 526 static inline int ip_tunnel_encap(struct sk_buff *skb, 527 struct ip_tunnel_encap *e, 528 u8 *protocol, struct flowi4 *fl4) 529 { 530 const struct ip_tunnel_encap_ops *ops; 531 int ret = -EINVAL; 532 533 if (e->type == TUNNEL_ENCAP_NONE) 534 return 0; 535 536 if (e->type >= MAX_IPTUN_ENCAP_OPS) 537 return -EINVAL; 538 539 rcu_read_lock(); 540 ops = rcu_dereference(iptun_encaps[e->type]); 541 if (likely(ops && ops->build_header)) 542 ret = ops->build_header(skb, e, protocol, fl4); 543 rcu_read_unlock(); 544 545 return ret; 546 } 547 548 /* Extract dsfield from inner protocol */ 549 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, 550 const struct sk_buff *skb) 551 { 552 __be16 payload_protocol = skb_protocol(skb, true); 553 554 if (payload_protocol == htons(ETH_P_IP)) 555 return iph->tos; 556 else if (payload_protocol == htons(ETH_P_IPV6)) 557 return ipv6_get_dsfield((const struct ipv6hdr *)iph); 558 else 559 return 0; 560 } 561 562 static inline __be32 ip_tunnel_get_flowlabel(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_IPV6)) 568 return ip6_flowlabel((const struct ipv6hdr *)iph); 569 else 570 return 0; 571 } 572 573 static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph, 574 const struct sk_buff *skb) 575 { 576 __be16 payload_protocol = skb_protocol(skb, true); 577 578 if (payload_protocol == htons(ETH_P_IP)) 579 return iph->ttl; 580 else if (payload_protocol == htons(ETH_P_IPV6)) 581 return ((const struct ipv6hdr *)iph)->hop_limit; 582 else 583 return 0; 584 } 585 586 /* Propagate ECN bits out */ 587 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, 588 const struct sk_buff *skb) 589 { 590 u8 inner = ip_tunnel_get_dsfield(iph, skb); 591 592 return INET_ECN_encapsulate(tos, inner); 593 } 594 595 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 596 __be16 inner_proto, bool raw_proto, bool xnet); 597 598 static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 599 __be16 inner_proto, bool xnet) 600 { 601 return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet); 602 } 603 604 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 605 __be32 src, __be32 dst, u8 proto, 606 u8 tos, u8 ttl, __be16 df, bool xnet); 607 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, 608 gfp_t flags); 609 int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst, 610 int headroom, bool reply); 611 612 int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask); 613 614 static inline int iptunnel_pull_offloads(struct sk_buff *skb) 615 { 616 if (skb_is_gso(skb)) { 617 int err; 618 619 err = skb_unclone(skb, GFP_ATOMIC); 620 if (unlikely(err)) 621 return err; 622 skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >> 623 NETIF_F_GSO_SHIFT); 624 } 625 626 skb->encapsulation = 0; 627 return 0; 628 } 629 630 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len) 631 { 632 if (pkt_len > 0) { 633 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); 634 635 u64_stats_update_begin(&tstats->syncp); 636 u64_stats_add(&tstats->tx_bytes, pkt_len); 637 u64_stats_inc(&tstats->tx_packets); 638 u64_stats_update_end(&tstats->syncp); 639 put_cpu_ptr(tstats); 640 return; 641 } 642 643 if (pkt_len < 0) { 644 DEV_STATS_INC(dev, tx_errors); 645 DEV_STATS_INC(dev, tx_aborted_errors); 646 } else { 647 DEV_STATS_INC(dev, tx_dropped); 648 } 649 } 650 651 static inline void ip_tunnel_info_opts_get(void *to, 652 const struct ip_tunnel_info *info) 653 { 654 memcpy(to, ip_tunnel_info_opts(info), info->options_len); 655 } 656 657 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, 658 const void *from, int len, 659 const unsigned long *flags) 660 { 661 info->options_len = len; 662 if (len > 0) { 663 memcpy(ip_tunnel_info_opts(info), from, len); 664 ip_tunnel_flags_or(info->key.tun_flags, info->key.tun_flags, 665 flags); 666 } 667 } 668 669 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 670 { 671 return (struct ip_tunnel_info *)lwtstate->data; 672 } 673 674 DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); 675 676 /* Returns > 0 if metadata should be collected */ 677 static inline int ip_tunnel_collect_metadata(void) 678 { 679 return static_branch_unlikely(&ip_tunnel_metadata_cnt); 680 } 681 682 void __init ip_tunnel_core_init(void); 683 684 void ip_tunnel_need_metadata(void); 685 void ip_tunnel_unneed_metadata(void); 686 687 #else /* CONFIG_INET */ 688 689 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 690 { 691 return NULL; 692 } 693 694 static inline void ip_tunnel_need_metadata(void) 695 { 696 } 697 698 static inline void ip_tunnel_unneed_metadata(void) 699 { 700 } 701 702 static inline void ip_tunnel_info_opts_get(void *to, 703 const struct ip_tunnel_info *info) 704 { 705 } 706 707 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, 708 const void *from, int len, 709 const unsigned long *flags) 710 { 711 info->options_len = 0; 712 } 713 714 #endif /* CONFIG_INET */ 715 716 #endif /* __NET_IP_TUNNELS_H */ 717