1 #ifndef __NET_IP_TUNNELS_H 2 #define __NET_IP_TUNNELS_H 1 3 4 #include <linux/if_tunnel.h> 5 #include <linux/netdevice.h> 6 #include <linux/skbuff.h> 7 #include <linux/socket.h> 8 #include <linux/types.h> 9 #include <linux/u64_stats_sync.h> 10 #include <net/dsfield.h> 11 #include <net/gro_cells.h> 12 #include <net/inet_ecn.h> 13 #include <net/netns/generic.h> 14 #include <net/rtnetlink.h> 15 #include <net/lwtunnel.h> 16 17 #if IS_ENABLED(CONFIG_IPV6) 18 #include <net/ipv6.h> 19 #include <net/ip6_fib.h> 20 #include <net/ip6_route.h> 21 #endif 22 23 /* Keep error state on tunnel for 30 sec */ 24 #define IPTUNNEL_ERR_TIMEO (30*HZ) 25 26 /* Used to memset ip_tunnel padding. */ 27 #define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) 28 29 /* Used to memset ipv4 address padding. */ 30 #define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst) 31 #define IP_TUNNEL_KEY_IPV4_PAD_LEN \ 32 (FIELD_SIZEOF(struct ip_tunnel_key, u) - \ 33 FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4)) 34 35 struct ip_tunnel_key { 36 __be64 tun_id; 37 union { 38 struct { 39 __be32 src; 40 __be32 dst; 41 } ipv4; 42 struct { 43 struct in6_addr src; 44 struct in6_addr dst; 45 } ipv6; 46 } u; 47 __be16 tun_flags; 48 u8 tos; /* TOS for IPv4, TC for IPv6 */ 49 u8 ttl; /* TTL for IPv4, HL for IPv6 */ 50 __be16 tp_src; 51 __be16 tp_dst; 52 }; 53 54 /* Flags for ip_tunnel_info mode. */ 55 #define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */ 56 #define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */ 57 58 struct ip_tunnel_info { 59 struct ip_tunnel_key key; 60 u8 options_len; 61 u8 mode; 62 }; 63 64 /* 6rd prefix/relay information */ 65 #ifdef CONFIG_IPV6_SIT_6RD 66 struct ip_tunnel_6rd_parm { 67 struct in6_addr prefix; 68 __be32 relay_prefix; 69 u16 prefixlen; 70 u16 relay_prefixlen; 71 }; 72 #endif 73 74 struct ip_tunnel_encap { 75 u16 type; 76 u16 flags; 77 __be16 sport; 78 __be16 dport; 79 }; 80 81 struct ip_tunnel_prl_entry { 82 struct ip_tunnel_prl_entry __rcu *next; 83 __be32 addr; 84 u16 flags; 85 struct rcu_head rcu_head; 86 }; 87 88 struct ip_tunnel_dst { 89 struct dst_entry __rcu *dst; 90 __be32 saddr; 91 }; 92 93 struct metadata_dst; 94 95 struct ip_tunnel { 96 struct ip_tunnel __rcu *next; 97 struct hlist_node hash_node; 98 struct net_device *dev; 99 struct net *net; /* netns for packet i/o */ 100 101 int err_count; /* Number of arrived ICMP errors */ 102 unsigned long err_time; /* Time when the last ICMP error 103 * arrived */ 104 105 /* These four fields used only by GRE */ 106 u32 i_seqno; /* The last seen seqno */ 107 u32 o_seqno; /* The last output seqno */ 108 int tun_hlen; /* Precalculated header length */ 109 int mlink; 110 111 struct ip_tunnel_dst __percpu *dst_cache; 112 113 struct ip_tunnel_parm parms; 114 115 int encap_hlen; /* Encap header length (FOU,GUE) */ 116 struct ip_tunnel_encap encap; 117 118 int hlen; /* tun_hlen + encap_hlen */ 119 120 /* for SIT */ 121 #ifdef CONFIG_IPV6_SIT_6RD 122 struct ip_tunnel_6rd_parm ip6rd; 123 #endif 124 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ 125 unsigned int prl_count; /* # of entries in PRL */ 126 int ip_tnl_net_id; 127 struct gro_cells gro_cells; 128 bool collect_md; 129 }; 130 131 #define TUNNEL_CSUM __cpu_to_be16(0x01) 132 #define TUNNEL_ROUTING __cpu_to_be16(0x02) 133 #define TUNNEL_KEY __cpu_to_be16(0x04) 134 #define TUNNEL_SEQ __cpu_to_be16(0x08) 135 #define TUNNEL_STRICT __cpu_to_be16(0x10) 136 #define TUNNEL_REC __cpu_to_be16(0x20) 137 #define TUNNEL_VERSION __cpu_to_be16(0x40) 138 #define TUNNEL_NO_KEY __cpu_to_be16(0x80) 139 #define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100) 140 #define TUNNEL_OAM __cpu_to_be16(0x0200) 141 #define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400) 142 #define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800) 143 #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000) 144 145 #define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT) 146 147 struct tnl_ptk_info { 148 __be16 flags; 149 __be16 proto; 150 __be32 key; 151 __be32 seq; 152 }; 153 154 #define PACKET_RCVD 0 155 #define PACKET_REJECT 1 156 157 #define IP_TNL_HASH_BITS 7 158 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) 159 160 struct ip_tunnel_net { 161 struct net_device *fb_tunnel_dev; 162 struct hlist_head tunnels[IP_TNL_HASH_SIZE]; 163 struct ip_tunnel __rcu *collect_md_tun; 164 }; 165 166 struct ip_tunnel_encap_ops { 167 size_t (*encap_hlen)(struct ip_tunnel_encap *e); 168 int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, 169 u8 *protocol, struct flowi4 *fl4); 170 }; 171 172 #define MAX_IPTUN_ENCAP_OPS 8 173 174 extern const struct ip_tunnel_encap_ops __rcu * 175 iptun_encaps[MAX_IPTUN_ENCAP_OPS]; 176 177 int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, 178 unsigned int num); 179 int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, 180 unsigned int num); 181 182 static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, 183 __be32 saddr, __be32 daddr, 184 u8 tos, u8 ttl, 185 __be16 tp_src, __be16 tp_dst, 186 __be64 tun_id, __be16 tun_flags) 187 { 188 key->tun_id = tun_id; 189 key->u.ipv4.src = saddr; 190 key->u.ipv4.dst = daddr; 191 memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, 192 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); 193 key->tos = tos; 194 key->ttl = ttl; 195 key->tun_flags = tun_flags; 196 197 /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of 198 * the upper tunnel are used. 199 * E.g: GRE over IPSEC, the tp_src and tp_port are zero. 200 */ 201 key->tp_src = tp_src; 202 key->tp_dst = tp_dst; 203 204 /* Clear struct padding. */ 205 if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) 206 memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, 207 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE); 208 } 209 210 static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info 211 *tun_info) 212 { 213 return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; 214 } 215 216 #ifdef CONFIG_INET 217 218 int ip_tunnel_init(struct net_device *dev); 219 void ip_tunnel_uninit(struct net_device *dev); 220 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); 221 struct net *ip_tunnel_get_link_net(const struct net_device *dev); 222 int ip_tunnel_get_iflink(const struct net_device *dev); 223 int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id, 224 struct rtnl_link_ops *ops, char *devname); 225 226 void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops); 227 228 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, 229 const struct iphdr *tnl_params, const u8 protocol); 230 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); 231 int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, 232 u8 *protocol, struct flowi4 *fl4); 233 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); 234 235 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev, 236 struct rtnl_link_stats64 *tot); 237 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, 238 int link, __be16 flags, 239 __be32 remote, __be32 local, 240 __be32 key); 241 242 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, 243 const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, 244 bool log_ecn_error); 245 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], 246 struct ip_tunnel_parm *p); 247 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], 248 struct ip_tunnel_parm *p); 249 void ip_tunnel_setup(struct net_device *dev, int net_id); 250 void ip_tunnel_dst_reset_all(struct ip_tunnel *t); 251 int ip_tunnel_encap_setup(struct ip_tunnel *t, 252 struct ip_tunnel_encap *ipencap); 253 254 /* Extract dsfield from inner protocol */ 255 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, 256 const struct sk_buff *skb) 257 { 258 if (skb->protocol == htons(ETH_P_IP)) 259 return iph->tos; 260 else if (skb->protocol == htons(ETH_P_IPV6)) 261 return ipv6_get_dsfield((const struct ipv6hdr *)iph); 262 else 263 return 0; 264 } 265 266 /* Propogate ECN bits out */ 267 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, 268 const struct sk_buff *skb) 269 { 270 u8 inner = ip_tunnel_get_dsfield(iph, skb); 271 272 return INET_ECN_encapsulate(tos, inner); 273 } 274 275 int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto); 276 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, 277 __be32 src, __be32 dst, u8 proto, 278 u8 tos, u8 ttl, __be16 df, bool xnet); 279 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, 280 gfp_t flags); 281 282 struct sk_buff *iptunnel_handle_offloads(struct sk_buff *skb, bool gre_csum, 283 int gso_type_mask); 284 285 static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len) 286 { 287 if (pkt_len > 0) { 288 struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); 289 290 u64_stats_update_begin(&tstats->syncp); 291 tstats->tx_bytes += pkt_len; 292 tstats->tx_packets++; 293 u64_stats_update_end(&tstats->syncp); 294 put_cpu_ptr(tstats); 295 } else { 296 struct net_device_stats *err_stats = &dev->stats; 297 298 if (pkt_len < 0) { 299 err_stats->tx_errors++; 300 err_stats->tx_aborted_errors++; 301 } else { 302 err_stats->tx_dropped++; 303 } 304 } 305 } 306 307 static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info) 308 { 309 return info + 1; 310 } 311 312 static inline void ip_tunnel_info_opts_get(void *to, 313 const struct ip_tunnel_info *info) 314 { 315 memcpy(to, info + 1, info->options_len); 316 } 317 318 static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, 319 const void *from, int len) 320 { 321 memcpy(ip_tunnel_info_opts(info), from, len); 322 info->options_len = len; 323 } 324 325 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 326 { 327 return (struct ip_tunnel_info *)lwtstate->data; 328 } 329 330 extern struct static_key ip_tunnel_metadata_cnt; 331 332 /* Returns > 0 if metadata should be collected */ 333 static inline int ip_tunnel_collect_metadata(void) 334 { 335 return static_key_false(&ip_tunnel_metadata_cnt); 336 } 337 338 void __init ip_tunnel_core_init(void); 339 340 void ip_tunnel_need_metadata(void); 341 void ip_tunnel_unneed_metadata(void); 342 343 #else /* CONFIG_INET */ 344 345 static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) 346 { 347 return NULL; 348 } 349 350 static inline void ip_tunnel_need_metadata(void) 351 { 352 } 353 354 static inline void ip_tunnel_unneed_metadata(void) 355 { 356 } 357 358 #endif /* CONFIG_INET */ 359 360 #endif /* __NET_IP_TUNNELS_H */ 361