1 #ifndef _IPV6_H 2 #define _IPV6_H 3 4 #include <uapi/linux/ipv6.h> 5 6 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3) 7 /* 8 * This structure contains configuration options per IPv6 link. 9 */ 10 struct ipv6_devconf { 11 __s32 forwarding; 12 __s32 hop_limit; 13 __s32 mtu6; 14 __s32 accept_ra; 15 __s32 accept_redirects; 16 __s32 autoconf; 17 __s32 dad_transmits; 18 __s32 rtr_solicits; 19 __s32 rtr_solicit_interval; 20 __s32 rtr_solicit_delay; 21 __s32 force_mld_version; 22 #ifdef CONFIG_IPV6_PRIVACY 23 __s32 use_tempaddr; 24 __s32 temp_valid_lft; 25 __s32 temp_prefered_lft; 26 __s32 regen_max_retry; 27 __s32 max_desync_factor; 28 #endif 29 __s32 max_addresses; 30 __s32 accept_ra_defrtr; 31 __s32 accept_ra_pinfo; 32 #ifdef CONFIG_IPV6_ROUTER_PREF 33 __s32 accept_ra_rtr_pref; 34 __s32 rtr_probe_interval; 35 #ifdef CONFIG_IPV6_ROUTE_INFO 36 __s32 accept_ra_rt_info_max_plen; 37 #endif 38 #endif 39 __s32 proxy_ndp; 40 __s32 accept_source_route; 41 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 42 __s32 optimistic_dad; 43 #endif 44 #ifdef CONFIG_IPV6_MROUTE 45 __s32 mc_forwarding; 46 #endif 47 __s32 disable_ipv6; 48 __s32 accept_dad; 49 __s32 force_tllao; 50 __s32 ndisc_notify; 51 void *sysctl; 52 }; 53 54 struct ipv6_params { 55 __s32 disable_ipv6; 56 __s32 autoconf; 57 }; 58 extern struct ipv6_params ipv6_defaults; 59 #include <linux/icmpv6.h> 60 #include <linux/tcp.h> 61 #include <linux/udp.h> 62 63 #include <net/inet_sock.h> 64 65 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 66 { 67 return (struct ipv6hdr *)skb_network_header(skb); 68 } 69 70 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 71 { 72 return (struct ipv6hdr *)skb_inner_network_header(skb); 73 } 74 75 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 76 { 77 return (struct ipv6hdr *)skb_transport_header(skb); 78 } 79 80 /* 81 This structure contains results of exthdrs parsing 82 as offsets from skb->nh. 83 */ 84 85 struct inet6_skb_parm { 86 int iif; 87 __be16 ra; 88 __u16 hop; 89 __u16 dst0; 90 __u16 srcrt; 91 __u16 dst1; 92 __u16 lastopt; 93 __u16 nhoff; 94 __u16 flags; 95 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 96 __u16 dsthao; 97 #endif 98 __u16 frag_max_size; 99 100 #define IP6SKB_XFRM_TRANSFORMED 1 101 #define IP6SKB_FORWARDED 2 102 #define IP6SKB_REROUTED 4 103 #define IP6SKB_ROUTERALERT 8 104 #define IP6SKB_FRAGMENTED 16 105 }; 106 107 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 108 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 109 110 static inline int inet6_iif(const struct sk_buff *skb) 111 { 112 return IP6CB(skb)->iif; 113 } 114 115 struct inet6_request_sock { 116 struct in6_addr loc_addr; 117 struct in6_addr rmt_addr; 118 struct sk_buff *pktopts; 119 int iif; 120 }; 121 122 struct tcp6_request_sock { 123 struct tcp_request_sock tcp6rsk_tcp; 124 struct inet6_request_sock tcp6rsk_inet6; 125 }; 126 127 struct ipv6_mc_socklist; 128 struct ipv6_ac_socklist; 129 struct ipv6_fl_socklist; 130 131 /** 132 * struct ipv6_pinfo - ipv6 private area 133 * 134 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 135 * this _must_ be the last member, so that inet6_sk_generic 136 * is able to calculate its offset from the base struct sock 137 * by using the struct proto->slab_obj_size member. -acme 138 */ 139 struct ipv6_pinfo { 140 struct in6_addr saddr; 141 struct in6_addr rcv_saddr; 142 struct in6_addr daddr; 143 struct in6_pktinfo sticky_pktinfo; 144 const struct in6_addr *daddr_cache; 145 #ifdef CONFIG_IPV6_SUBTREES 146 const struct in6_addr *saddr_cache; 147 #endif 148 149 __be32 flow_label; 150 __u32 frag_size; 151 152 /* 153 * Packed in 16bits. 154 * Omit one shift by by putting the signed field at MSB. 155 */ 156 #if defined(__BIG_ENDIAN_BITFIELD) 157 __s16 hop_limit:9; 158 __u16 __unused_1:7; 159 #else 160 __u16 __unused_1:7; 161 __s16 hop_limit:9; 162 #endif 163 164 #if defined(__BIG_ENDIAN_BITFIELD) 165 /* Packed in 16bits. */ 166 __s16 mcast_hops:9; 167 __u16 __unused_2:6, 168 mc_loop:1; 169 #else 170 __u16 mc_loop:1, 171 __unused_2:6; 172 __s16 mcast_hops:9; 173 #endif 174 int ucast_oif; 175 int mcast_oif; 176 177 /* pktoption flags */ 178 union { 179 struct { 180 __u16 srcrt:1, 181 osrcrt:1, 182 rxinfo:1, 183 rxoinfo:1, 184 rxhlim:1, 185 rxohlim:1, 186 hopopts:1, 187 ohopopts:1, 188 dstopts:1, 189 odstopts:1, 190 rxflow:1, 191 rxtclass:1, 192 rxpmtu:1, 193 rxorigdstaddr:1; 194 /* 2 bits hole */ 195 } bits; 196 __u16 all; 197 } rxopt; 198 199 /* sockopt flags */ 200 __u16 recverr:1, 201 sndflow:1, 202 pmtudisc:2, 203 ipv6only:1, 204 srcprefs:3, /* 001: prefer temporary address 205 * 010: prefer public address 206 * 100: prefer care-of address 207 */ 208 dontfrag:1; 209 __u8 min_hopcount; 210 __u8 tclass; 211 __u8 rcv_tclass; 212 213 __u32 dst_cookie; 214 __u32 rx_dst_cookie; 215 216 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 217 struct ipv6_ac_socklist *ipv6_ac_list; 218 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 219 220 struct ipv6_txoptions *opt; 221 struct sk_buff *pktoptions; 222 struct sk_buff *rxpmtu; 223 struct { 224 struct ipv6_txoptions *opt; 225 u8 hop_limit; 226 u8 tclass; 227 } cork; 228 }; 229 230 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 231 struct raw6_sock { 232 /* inet_sock has to be the first member of raw6_sock */ 233 struct inet_sock inet; 234 __u32 checksum; /* perform checksum */ 235 __u32 offset; /* checksum offset */ 236 struct icmp6_filter filter; 237 __u32 ip6mr_table; 238 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 239 struct ipv6_pinfo inet6; 240 }; 241 242 struct udp6_sock { 243 struct udp_sock udp; 244 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 245 struct ipv6_pinfo inet6; 246 }; 247 248 struct tcp6_sock { 249 struct tcp_sock tcp; 250 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 251 struct ipv6_pinfo inet6; 252 }; 253 254 extern int inet6_sk_rebuild_header(struct sock *sk); 255 256 struct inet6_timewait_sock { 257 struct in6_addr tw_v6_daddr; 258 struct in6_addr tw_v6_rcv_saddr; 259 }; 260 261 struct tcp6_timewait_sock { 262 struct tcp_timewait_sock tcp6tw_tcp; 263 struct inet6_timewait_sock tcp6tw_inet6; 264 }; 265 266 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 267 { 268 return (struct inet6_timewait_sock *)(((u8 *)sk) + 269 inet_twsk(sk)->tw_ipv6_offset); 270 } 271 272 #if IS_ENABLED(CONFIG_IPV6) 273 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 274 { 275 return inet_sk(__sk)->pinet6; 276 } 277 278 static inline struct inet6_request_sock * 279 inet6_rsk(const struct request_sock *rsk) 280 { 281 return (struct inet6_request_sock *)(((u8 *)rsk) + 282 inet_rsk(rsk)->inet6_rsk_offset); 283 } 284 285 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 286 { 287 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 288 } 289 290 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 291 { 292 struct request_sock *req = reqsk_alloc(ops); 293 294 if (req != NULL) { 295 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 296 inet6_rsk(req)->pktopts = NULL; 297 } 298 299 return req; 300 } 301 302 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 303 { 304 return (struct raw6_sock *)sk; 305 } 306 307 static inline void inet_sk_copy_descendant(struct sock *sk_to, 308 const struct sock *sk_from) 309 { 310 int ancestor_size = sizeof(struct inet_sock); 311 312 if (sk_from->sk_family == PF_INET6) 313 ancestor_size += sizeof(struct ipv6_pinfo); 314 315 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 316 } 317 318 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 319 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 320 321 static inline u16 inet6_tw_offset(const struct proto *prot) 322 { 323 return prot->twsk_prot->twsk_obj_size - 324 sizeof(struct inet6_timewait_sock); 325 } 326 327 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 328 { 329 return likely(sk->sk_state != TCP_TIME_WAIT) ? 330 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 331 } 332 333 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 334 { 335 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 336 } 337 338 static inline int inet_v6_ipv6only(const struct sock *sk) 339 { 340 return likely(sk->sk_state != TCP_TIME_WAIT) ? 341 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 342 } 343 #else 344 #define __ipv6_only_sock(sk) 0 345 #define ipv6_only_sock(sk) 0 346 347 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 348 { 349 return NULL; 350 } 351 352 static inline struct inet6_request_sock * 353 inet6_rsk(const struct request_sock *rsk) 354 { 355 return NULL; 356 } 357 358 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 359 { 360 return NULL; 361 } 362 363 #define __inet6_rcv_saddr(__sk) NULL 364 #define inet6_rcv_saddr(__sk) NULL 365 #define tcp_twsk_ipv6only(__sk) 0 366 #define inet_v6_ipv6only(__sk) 0 367 #endif /* IS_ENABLED(CONFIG_IPV6) */ 368 369 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \ 370 ((inet_sk(__sk)->inet_portpair == (__ports)) && \ 371 ((__sk)->sk_family == AF_INET6) && \ 372 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 373 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 374 (!(__sk)->sk_bound_dev_if || \ 375 ((__sk)->sk_bound_dev_if == (__dif))) && \ 376 net_eq(sock_net(__sk), (__net))) 377 378 #define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \ 379 ((inet_twsk(__sk)->tw_portpair == (__ports)) && \ 380 ((__sk)->sk_family == AF_INET6) && \ 381 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)) && \ 382 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \ 383 (!(__sk)->sk_bound_dev_if || \ 384 ((__sk)->sk_bound_dev_if == (__dif))) && \ 385 net_eq(sock_net(__sk), (__net))) 386 387 #endif /* _IPV6_H */ 388