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) + 1)),\ 99 struct ip_tunnel_info * : ((void *)((info) + 1))\ 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 }; 111 112 /* 6rd prefix/relay information */ 113 #ifdef CONFIG_IPV6_SIT_6RD 114 struct ip_tunnel_6rd_parm { 115 struct in6_addr prefix; 116 __be32 relay_prefix; 117 u16 prefixlen; 118 u16 relay_prefixlen; 119 }; 120 #endif 121 122 struct ip_tunnel_prl_entry { 123 struct ip_tunnel_prl_entry __rcu *next; 124 __be32 addr; 125 u16 flags; 126 struct rcu_head rcu_head; 127 }; 128 129 struct metadata_dst; 130 131 /* Kernel-side variant of ip_tunnel_parm */ 132 struct ip_tunnel_parm_kern { 133 char name[IFNAMSIZ]; 134 IP_TUNNEL_DECLARE_FLAGS(i_flags); 135 IP_TUNNEL_DECLARE_FLAGS(o_flags); 136 __be32 i_key; 137 __be32 o_key; 138 int link; 139 struct iphdr iph; 140 }; 141 142 struct ip_tunnel { 143 struct ip_tunnel __rcu *next; 144 struct hlist_node hash_node; 145 146 struct net_device *dev; 147 netdevice_tracker dev_tracker; 148 149 struct net *net; /* netns for packet i/o */ 150 151 unsigned long err_time; /* Time when the last ICMP error 152 * arrived */ 153 int err_count; /* Number of arrived ICMP errors */ 154 155 /* These four fields used only by GRE */ 156 u32 i_seqno; /* The last seen seqno */ 157 atomic_t o_seqno; /* The last output seqno */ 158 int tun_hlen; /* Precalculated header length */ 159 160 /* These four fields used only by ERSPAN */ 161 u32 index; /* ERSPAN type II index */ 162 u8 erspan_ver; /* ERSPAN version */ 163 u8 dir; /* ERSPAN direction */ 164 u16 hwid; /* ERSPAN hardware ID */ 165 166 struct dst_cache dst_cache; 167 168 struct ip_tunnel_parm_kern parms; 169 170 int mlink; 171 int encap_hlen; /* Encap header length (FOU,GUE) */ 172 int hlen; /* tun_hlen + encap_hlen */ 173 struct ip_tunnel_encap encap; 174 175 /* for SIT */ 176 #ifdef CONFIG_IPV6_SIT_6RD 177 struct ip_tunnel_6rd_parm ip6rd; 178 #endif 179 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ 180 unsigned int prl_count; /* # of entries in PRL */ 181 unsigned int ip_tnl_net_id; 182 struct gro_cells gro_cells; 183 __u32 fwmark; 184 bool collect_md; 185 bool ignore_df; 186 }; 187 188 struct tnl_ptk_info { 189 IP_TUNNEL_DECLARE_FLAGS(flags); 190 __be16 proto; 191 __be32 key; 192 __be32 seq; 193 int hdr_len; 194 }; 195 196 #define PACKET_RCVD 0 197 #define PACKET_REJECT 1 198 #define PACKET_NEXT 2 199 200 #define IP_TNL_HASH_BITS 7 201 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) 202 203 struct ip_tunnel_net { 204 struct net_device *fb_tunnel_dev; 205 struct rtnl_link_ops *rtnl_link_ops; 206 struct hlist_head tunnels[IP_TNL_HASH_SIZE]; 207 struct ip_tunnel __rcu *collect_md_tun; 208 int type; 209 }; 210 ip_tunnel_set_options_present(unsigned long * flags)211 static inline void ip_tunnel_set_options_present(unsigned long *flags) 212 { 213 IP_TUNNEL_DECLARE_FLAGS(present) = { }; 214 215 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); 216 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); 217 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); 218 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); 219 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); 220 221 ip_tunnel_flags_or(flags, flags, present); 222 } 223 ip_tunnel_clear_options_present(unsigned long * flags)224 static inline void ip_tunnel_clear_options_present(unsigned long *flags) 225 { 226 IP_TUNNEL_DECLARE_FLAGS(present) = { }; 227 228 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); 229 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); 230 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); 231 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); 232 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); 233 234 __ipt_flag_op(bitmap_andnot, flags, flags, present); 235 } 236 ip_tunnel_is_options_present(const unsigned long * flags)237 static inline bool ip_tunnel_is_options_present(const unsigned long *flags) 238 { 239 IP_TUNNEL_DECLARE_FLAGS(present) = { }; 240 241 __set_bit(IP_TUNNEL_GENEVE_OPT_BIT, present); 242 __set_bit(IP_TUNNEL_VXLAN_OPT_BIT, present); 243 __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT, present); 244 __set_bit(IP_TUNNEL_GTP_OPT_BIT, present); 245 __set_bit(IP_TUNNEL_PFCP_OPT_BIT, present); 246 247 return ip_tunnel_flags_intersect(flags, present); 248 } 249 ip_tunnel_flags_is_be16_compat(const unsigned long * flags)250 static inline bool ip_tunnel_flags_is_be16_compat(const unsigned long *flags) 251 { 252 IP_TUNNEL_DECLARE_FLAGS(supp) = { }; 253 254 bitmap_set(supp, 0, BITS_PER_TYPE(__be16)); 255 __set_bit(IP_TUNNEL_VTI_BIT, supp); 256 257 return ip_tunnel_flags_subset(flags, supp); 258 } 259 ip_tunnel_flags_from_be16(unsigned long * dst,__be16 flags)260 static inline void ip_tunnel_flags_from_be16(unsigned long *dst, __be16 flags) 261 { 262 ip_tunnel_flags_zero(dst); 263 264 bitmap_write(dst, be16_to_cpu(flags), 0, BITS_PER_TYPE(__be16)); 265 __assign_bit(IP_TUNNEL_VTI_BIT, dst, flags & VTI_ISVTI); 266 } 267 ip_tunnel_flags_to_be16(const unsigned long * flags)268 static inline __be16 ip_tunnel_flags_to_be16(const unsigned long *flags) 269 { 270 __be16 ret; 271 272 ret = cpu_to_be16(bitmap_read(flags, 0, BITS_PER_TYPE(__be16))); 273 if (test_bit(IP_TUNNEL_VTI_BIT, flags)) 274 ret |= VTI_ISVTI; 275 276 return ret; 277 } 278 ip_tunnel_key_init(struct ip_tunnel_key * key,__be32 saddr,__be32 daddr,u8 tos,u8 ttl,__be32 label,__be16 tp_src,__be16 tp_dst,__be64 tun_id,const unsigned long * tun_flags)279 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, 280 __be32 saddr, __be32 daddr, 281 u8 tos, u8 ttl, __be32 label, 282 __be16 tp_src, __be16 tp_dst, 283 __be64 tun_id, 284 const unsigned long *tun_flags) 285 { 286 key->tun_id = tun_id; 287 key->u.ipv4.src = saddr; 288 key->u.ipv4.dst = daddr; 289 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, 290 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); 291 key->tos = tos; 292 key->ttl = ttl; 293 key->label = label; 294 ip_tunnel_flags_copy(key->tun_flags, tun_flags); 295 296 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of 297 * the upper tunnel are used. 298 * E.g: GRE over IPSEC, the tp_src and tp_port are zero. 299 */ 300 key->tp_src = tp_src; 301 key->tp_dst = tp_dst; 302 303 /* Clear struct padding. */ 304 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) 305 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, 306 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE); 307 } 308 309 static inline bool ip_tunnel_dst_cache_usable(const struct sk_buff * skb,const struct ip_tunnel_info * info)310 ip_tunnel_dst_cache_usable(const struct sk_buff *skb, 311 const struct ip_tunnel_info *info) 312 { 313 if (skb->mark) 314 return false; 315 316 return !info || !test_bit(IP_TUNNEL_NOCACHE_BIT, info->key.tun_flags); 317 } 318 ip_tunnel_info_af(const struct ip_tunnel_info * tun_info)319 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info 320 *tun_info) 321 { 322 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; 323 } 324 key32_to_tunnel_id(__be32 key)325 static inline __be64 key32_to_tunnel_id(__be32 key) 326 { 327 #ifdef __BIG_ENDIAN 328 return (__force __be64)key; 329 #else 330 return (__force __be64)((__force u64)key << 32); 331 #endif 332 } 333 334 /* Returns the least-significant 32 bits of a __be64. */ tunnel_id_to_key32(__be64 tun_id)335 static inline __be32 tunnel_id_to_key32(__be64 tun_id) 336 { 337 #ifdef __BIG_ENDIAN 338 return (__force __be32)tun_id; 339 #else 340 return (__force __be32)((__force u64)tun_id >> 32); 341 #endif 342 } 343 344 #ifdef CONFIG_INET 345 ip_tunnel_init_flow(struct flowi4 * fl4,int proto,__be32 daddr,__be32 saddr,__be32 key,__u8 tos,struct net * net,int oif,__u32 mark,__u32 tun_inner_hash,__u8 flow_flags)346 static inline void ip_tunnel_init_flow(struct flowi4 *fl4, 347 int proto, 348 __be32 daddr, __be32 saddr, 349 __be32 key, __u8 tos, 350 struct net *net, int oif, 351 __u32 mark, __u32 tun_inner_hash, 352 __u8 flow_flags) 353 { 354 memset(fl4, 0, sizeof(*fl4)); 355 356 if (oif) { 357 fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index(net, oif); 358 /* Legacy VRF/l3mdev use case */ 359 fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : oif; 360 } 361 362 fl4->daddr = daddr; 363 fl4->saddr = saddr; 364 fl4->flowi4_tos = tos; 365 fl4->flowi4_proto = proto; 366 fl4->fl4_gre_key = key; 367 fl4->flowi4_mark = mark; 368 fl4->flowi4_multipath_hash = tun_inner_hash; 369 fl4->flowi4_flags = flow_flags; 370 } 371 372 int ip_tunnel_init(struct net_device *dev); 373 void ip_tunnel_uninit(struct net_device *dev); 374 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); 375 struct net *ip_tunnel_get_link_net(const struct net_device *dev); 376 int ip_tunnel_get_iflink(const struct net_device *dev); 377 int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, 378 struct rtnl_link_ops *ops, char *devname); 379 380 void ip_tunnel_delete_nets(struct list_head *list_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_device *dev, struct nlattr *tb[], 410 struct ip_tunnel_parm_kern *p, __u32 fwmark); 411 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id); 412 413 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], 414 struct ip_tunnel_encap *encap); 415 416 void ip_tunnel_netlink_parms(struct nlattr *data[], 417 struct ip_tunnel_parm_kern *parms); 418 419 extern const struct header_ops ip_tunnel_header_ops; 420 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb); 421 422 struct ip_tunnel_encap_ops { 423 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 424 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 425 u8 *protocol, struct flowi4 *fl4); 426 int (*err_handler)(struct sk_buff *skb, u32 info); 427 }; 428 429 #define MAX_IPTUN_ENCAP_OPS 8 430 431 extern const struct ip_tunnel_encap_ops __rcu * 432 iptun_encaps[MAX_IPTUN_ENCAP_OPS]; 433 434 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, 435 unsigned int num); 436 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, 437 unsigned int num); 438 439 int ip_tunnel_encap_setup(struct ip_tunnel *t, 440 struct ip_tunnel_encap *ipencap); 441 pskb_inet_may_pull(struct sk_buff * skb)442 static inline bool pskb_inet_may_pull(struct sk_buff *skb) 443 { 444 int nhlen; 445 446 switch (skb->protocol) { 447 #if IS_ENABLED(CONFIG_IPV6) 448 case htons(ETH_P_IPV6): 449 nhlen = sizeof(struct ipv6hdr); 450 break; 451 #endif 452 case htons(ETH_P_IP): 453 nhlen = sizeof(struct iphdr); 454 break; 455 default: 456 nhlen = 0; 457 } 458 459 return pskb_network_may_pull(skb, nhlen); 460 } 461 462 /* Variant of pskb_inet_may_pull(). 463 */ skb_vlan_inet_prepare(struct sk_buff * skb,bool inner_proto_inherit)464 static inline bool skb_vlan_inet_prepare(struct sk_buff *skb, 465 bool inner_proto_inherit) 466 { 467 int nhlen = 0, maclen = inner_proto_inherit ? 0 : ETH_HLEN; 468 __be16 type = skb->protocol; 469 470 /* Essentially this is skb_protocol(skb, true) 471 * And we get MAC len. 472 */ 473 if (eth_type_vlan(type)) 474 type = __vlan_get_protocol(skb, type, &maclen); 475 476 switch (type) { 477 #if IS_ENABLED(CONFIG_IPV6) 478 case htons(ETH_P_IPV6): 479 nhlen = sizeof(struct ipv6hdr); 480 break; 481 #endif 482 case htons(ETH_P_IP): 483 nhlen = sizeof(struct iphdr); 484 break; 485 } 486 /* For ETH_P_IPV6/ETH_P_IP we make sure to pull 487 * a base network header in skb->head. 488 */ 489 if (!pskb_may_pull(skb, maclen + nhlen)) 490 return false; 491 492 skb_set_network_header(skb, maclen); 493 return true; 494 } 495 ip_encap_hlen(struct ip_tunnel_encap * e)496 static inline int ip_encap_hlen(struct ip_tunnel_encap *e) 497 { 498 const struct ip_tunnel_encap_ops *ops; 499 int hlen = -EINVAL; 500 501 if (e->type == TUNNEL_ENCAP_NONE) 502 return 0; 503 504 if (e->type >= MAX_IPTUN_ENCAP_OPS) 505 return -EINVAL; 506 507 rcu_read_lock(); 508 ops = rcu_dereference(iptun_encaps[e->type]); 509 if (likely(ops && ops->encap_hlen)) 510 hlen = ops->encap_hlen(e); 511 rcu_read_unlock(); 512 513 return hlen; 514 } 515 ip_tunnel_encap(struct sk_buff * skb,struct ip_tunnel_encap * e,u8 * protocol,struct flowi4 * fl4)516 static inline int ip_tunnel_encap(struct sk_buff *skb, 517 struct ip_tunnel_encap *e, 518 u8 *protocol, struct flowi4 *fl4) 519 { 520 const struct ip_tunnel_encap_ops *ops; 521 int ret = -EINVAL; 522 523 if (e->type == TUNNEL_ENCAP_NONE) 524 return 0; 525 526 if (e->type >= MAX_IPTUN_ENCAP_OPS) 527 return -EINVAL; 528 529 rcu_read_lock(); 530 ops = rcu_dereference(iptun_encaps[e->type]); 531 if (likely(ops && ops->build_header)) 532 ret = ops->build_header(skb, e, protocol, fl4); 533 rcu_read_unlock(); 534 535 return ret; 536 } 537 538 /* Extract dsfield from inner protocol */ ip_tunnel_get_dsfield(const struct iphdr * iph,const struct sk_buff * skb)539 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, 540 const struct sk_buff *skb) 541 { 542 __be16 payload_protocol = skb_protocol(skb, true); 543 544 if (payload_protocol == htons(ETH_P_IP)) 545 return iph->tos; 546 else if (payload_protocol == htons(ETH_P_IPV6)) 547 return ipv6_get_dsfield((const struct ipv6hdr *)iph); 548 else 549 return 0; 550 } 551 ip_tunnel_get_flowlabel(const struct iphdr * iph,const struct sk_buff * skb)552 static inline __be32 ip_tunnel_get_flowlabel(const struct iphdr *iph, 553 const struct sk_buff *skb) 554 { 555 __be16 payload_protocol = skb_protocol(skb, true); 556 557 if (payload_protocol == htons(ETH_P_IPV6)) 558 return ip6_flowlabel((const struct ipv6hdr *)iph); 559 else 560 return 0; 561 } 562 ip_tunnel_get_ttl(const struct iphdr * iph,const struct sk_buff * skb)563 static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph, 564 const struct sk_buff *skb) 565 { 566 __be16 payload_protocol = skb_protocol(skb, true); 567 568 if (payload_protocol == htons(ETH_P_IP)) 569 return iph->ttl; 570 else if (payload_protocol == htons(ETH_P_IPV6)) 571 return ((const struct ipv6hdr *)iph)->hop_limit; 572 else 573 return 0; 574 } 575 576 /* Propagate ECN bits out */ ip_tunnel_ecn_encap(u8 tos,const struct iphdr * iph,const struct sk_buff * skb)577 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, 578 const struct sk_buff *skb) 579 { 580 u8 inner = ip_tunnel_get_dsfield(iph, skb); 581 582 return INET_ECN_encapsulate(tos, inner); 583 } 584 585 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 586 __be16 inner_proto, bool raw_proto, bool xnet); 587 iptunnel_pull_header(struct sk_buff * skb,int hdr_len,__be16 inner_proto,bool xnet)588 static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, 589 __be16 inner_proto, bool xnet) 590 { 591 return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet); 592 } 593 594 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 595 __be32 src, __be32 dst, u8 proto, 596 u8 tos, u8 ttl, __be16 df, bool xnet); 597 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, 598 gfp_t flags); 599 int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst, 600 int headroom, bool reply); 601 602 int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask); 603 iptunnel_pull_offloads(struct sk_buff * skb)604 static inline int iptunnel_pull_offloads(struct sk_buff *skb) 605 { 606 if (skb_is_gso(skb)) { 607 int err; 608 609 err = skb_unclone(skb, GFP_ATOMIC); 610 if (unlikely(err)) 611 return err; 612 skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >> 613 NETIF_F_GSO_SHIFT); 614 } 615 616 skb->encapsulation = 0; 617 return 0; 618 } 619 iptunnel_xmit_stats(struct net_device * dev,int pkt_len)620 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len) 621 { 622 if (pkt_len > 0) { 623 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); 624 625 u64_stats_update_begin(&tstats->syncp); 626 u64_stats_add(&tstats->tx_bytes, pkt_len); 627 u64_stats_inc(&tstats->tx_packets); 628 u64_stats_update_end(&tstats->syncp); 629 put_cpu_ptr(tstats); 630 return; 631 } 632 633 if (pkt_len < 0) { 634 DEV_STATS_INC(dev, tx_errors); 635 DEV_STATS_INC(dev, tx_aborted_errors); 636 } else { 637 DEV_STATS_INC(dev, tx_dropped); 638 } 639 } 640 ip_tunnel_info_opts_get(void * to,const struct ip_tunnel_info * info)641 static inline void ip_tunnel_info_opts_get(void *to, 642 const struct ip_tunnel_info *info) 643 { 644 memcpy(to, info + 1, info->options_len); 645 } 646 ip_tunnel_info_opts_set(struct ip_tunnel_info * info,const void * from,int len,const unsigned long * flags)647 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, 648 const void *from, int len, 649 const unsigned long *flags) 650 { 651 info->options_len = len; 652 if (len > 0) { 653 memcpy(ip_tunnel_info_opts(info), from, len); 654 ip_tunnel_flags_or(info->key.tun_flags, info->key.tun_flags, 655 flags); 656 } 657 } 658 lwt_tun_info(struct lwtunnel_state * lwtstate)659 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 660 { 661 return (struct ip_tunnel_info *)lwtstate->data; 662 } 663 664 DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); 665 666 /* Returns > 0 if metadata should be collected */ ip_tunnel_collect_metadata(void)667 static inline int ip_tunnel_collect_metadata(void) 668 { 669 return static_branch_unlikely(&ip_tunnel_metadata_cnt); 670 } 671 672 void __init ip_tunnel_core_init(void); 673 674 void ip_tunnel_need_metadata(void); 675 void ip_tunnel_unneed_metadata(void); 676 677 #else /* CONFIG_INET */ 678 lwt_tun_info(struct lwtunnel_state * lwtstate)679 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 680 { 681 return NULL; 682 } 683 ip_tunnel_need_metadata(void)684 static inline void ip_tunnel_need_metadata(void) 685 { 686 } 687 ip_tunnel_unneed_metadata(void)688 static inline void ip_tunnel_unneed_metadata(void) 689 { 690 } 691 ip_tunnel_info_opts_get(void * to,const struct ip_tunnel_info * info)692 static inline void ip_tunnel_info_opts_get(void *to, 693 const struct ip_tunnel_info *info) 694 { 695 } 696 ip_tunnel_info_opts_set(struct ip_tunnel_info * info,const void * from,int len,const unsigned long * flags)697 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, 698 const void *from, int len, 699 const unsigned long *flags) 700 { 701 info->options_len = 0; 702 } 703 704 #endif /* CONFIG_INET */ 705 706 #endif /* __NET_IP_TUNNELS_H */ 707