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 void *sysctl; 51 }; 52 53 struct ipv6_params { 54 __s32 disable_ipv6; 55 __s32 autoconf; 56 }; 57 extern struct ipv6_params ipv6_defaults; 58 #include <linux/icmpv6.h> 59 #include <linux/tcp.h> 60 #include <linux/udp.h> 61 62 #include <net/inet_sock.h> 63 64 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 65 { 66 return (struct ipv6hdr *)skb_network_header(skb); 67 } 68 69 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 70 { 71 return (struct ipv6hdr *)skb_transport_header(skb); 72 } 73 74 static inline __u8 ipv6_tclass(const struct ipv6hdr *iph) 75 { 76 return (ntohl(*(__be32 *)iph) >> 20) & 0xff; 77 } 78 79 /* 80 This structure contains results of exthdrs parsing 81 as offsets from skb->nh. 82 */ 83 84 struct inet6_skb_parm { 85 int iif; 86 __u16 ra; 87 __u16 hop; 88 __u16 dst0; 89 __u16 srcrt; 90 __u16 dst1; 91 __u16 lastopt; 92 __u16 nhoff; 93 __u16 flags; 94 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 95 __u16 dsthao; 96 #endif 97 __u16 frag_max_size; 98 99 #define IP6SKB_XFRM_TRANSFORMED 1 100 #define IP6SKB_FORWARDED 2 101 #define IP6SKB_REROUTED 4 102 }; 103 104 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 105 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 106 107 static inline int inet6_iif(const struct sk_buff *skb) 108 { 109 return IP6CB(skb)->iif; 110 } 111 112 struct inet6_request_sock { 113 struct in6_addr loc_addr; 114 struct in6_addr rmt_addr; 115 struct sk_buff *pktopts; 116 int iif; 117 }; 118 119 struct tcp6_request_sock { 120 struct tcp_request_sock tcp6rsk_tcp; 121 struct inet6_request_sock tcp6rsk_inet6; 122 }; 123 124 struct ipv6_mc_socklist; 125 struct ipv6_ac_socklist; 126 struct ipv6_fl_socklist; 127 128 /** 129 * struct ipv6_pinfo - ipv6 private area 130 * 131 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 132 * this _must_ be the last member, so that inet6_sk_generic 133 * is able to calculate its offset from the base struct sock 134 * by using the struct proto->slab_obj_size member. -acme 135 */ 136 struct ipv6_pinfo { 137 struct in6_addr saddr; 138 struct in6_addr rcv_saddr; 139 struct in6_addr daddr; 140 struct in6_pktinfo sticky_pktinfo; 141 const struct in6_addr *daddr_cache; 142 #ifdef CONFIG_IPV6_SUBTREES 143 const struct in6_addr *saddr_cache; 144 #endif 145 146 __be32 flow_label; 147 __u32 frag_size; 148 149 /* 150 * Packed in 16bits. 151 * Omit one shift by by putting the signed field at MSB. 152 */ 153 #if defined(__BIG_ENDIAN_BITFIELD) 154 __s16 hop_limit:9; 155 __u16 __unused_1:7; 156 #else 157 __u16 __unused_1:7; 158 __s16 hop_limit:9; 159 #endif 160 161 #if defined(__BIG_ENDIAN_BITFIELD) 162 /* Packed in 16bits. */ 163 __s16 mcast_hops:9; 164 __u16 __unused_2:6, 165 mc_loop:1; 166 #else 167 __u16 mc_loop:1, 168 __unused_2:6; 169 __s16 mcast_hops:9; 170 #endif 171 int ucast_oif; 172 int mcast_oif; 173 174 /* pktoption flags */ 175 union { 176 struct { 177 __u16 srcrt:1, 178 osrcrt:1, 179 rxinfo:1, 180 rxoinfo:1, 181 rxhlim:1, 182 rxohlim:1, 183 hopopts:1, 184 ohopopts:1, 185 dstopts:1, 186 odstopts:1, 187 rxflow:1, 188 rxtclass:1, 189 rxpmtu:1, 190 rxorigdstaddr:1; 191 /* 2 bits hole */ 192 } bits; 193 __u16 all; 194 } rxopt; 195 196 /* sockopt flags */ 197 __u16 recverr:1, 198 sndflow:1, 199 pmtudisc:2, 200 ipv6only:1, 201 srcprefs:3, /* 001: prefer temporary address 202 * 010: prefer public address 203 * 100: prefer care-of address 204 */ 205 dontfrag:1; 206 __u8 min_hopcount; 207 __u8 tclass; 208 __u8 rcv_tclass; 209 210 __u32 dst_cookie; 211 __u32 rx_dst_cookie; 212 213 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 214 struct ipv6_ac_socklist *ipv6_ac_list; 215 struct ipv6_fl_socklist *ipv6_fl_list; 216 217 struct ipv6_txoptions *opt; 218 struct sk_buff *pktoptions; 219 struct sk_buff *rxpmtu; 220 struct { 221 struct ipv6_txoptions *opt; 222 u8 hop_limit; 223 u8 tclass; 224 } cork; 225 }; 226 227 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 228 struct raw6_sock { 229 /* inet_sock has to be the first member of raw6_sock */ 230 struct inet_sock inet; 231 __u32 checksum; /* perform checksum */ 232 __u32 offset; /* checksum offset */ 233 struct icmp6_filter filter; 234 __u32 ip6mr_table; 235 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 236 struct ipv6_pinfo inet6; 237 }; 238 239 struct udp6_sock { 240 struct udp_sock udp; 241 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 242 struct ipv6_pinfo inet6; 243 }; 244 245 struct tcp6_sock { 246 struct tcp_sock tcp; 247 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 248 struct ipv6_pinfo inet6; 249 }; 250 251 extern int inet6_sk_rebuild_header(struct sock *sk); 252 253 struct inet6_timewait_sock { 254 struct in6_addr tw_v6_daddr; 255 struct in6_addr tw_v6_rcv_saddr; 256 }; 257 258 struct tcp6_timewait_sock { 259 struct tcp_timewait_sock tcp6tw_tcp; 260 struct inet6_timewait_sock tcp6tw_inet6; 261 }; 262 263 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 264 { 265 return (struct inet6_timewait_sock *)(((u8 *)sk) + 266 inet_twsk(sk)->tw_ipv6_offset); 267 } 268 269 #if IS_ENABLED(CONFIG_IPV6) 270 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 271 { 272 return inet_sk(__sk)->pinet6; 273 } 274 275 static inline struct inet6_request_sock * 276 inet6_rsk(const struct request_sock *rsk) 277 { 278 return (struct inet6_request_sock *)(((u8 *)rsk) + 279 inet_rsk(rsk)->inet6_rsk_offset); 280 } 281 282 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 283 { 284 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 285 } 286 287 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 288 { 289 struct request_sock *req = reqsk_alloc(ops); 290 291 if (req != NULL) { 292 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 293 inet6_rsk(req)->pktopts = NULL; 294 } 295 296 return req; 297 } 298 299 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 300 { 301 return (struct raw6_sock *)sk; 302 } 303 304 static inline void inet_sk_copy_descendant(struct sock *sk_to, 305 const struct sock *sk_from) 306 { 307 int ancestor_size = sizeof(struct inet_sock); 308 309 if (sk_from->sk_family == PF_INET6) 310 ancestor_size += sizeof(struct ipv6_pinfo); 311 312 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 313 } 314 315 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 316 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 317 318 static inline u16 inet6_tw_offset(const struct proto *prot) 319 { 320 return prot->twsk_prot->twsk_obj_size - 321 sizeof(struct inet6_timewait_sock); 322 } 323 324 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 325 { 326 return likely(sk->sk_state != TCP_TIME_WAIT) ? 327 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 328 } 329 330 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 331 { 332 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 333 } 334 335 static inline int inet_v6_ipv6only(const struct sock *sk) 336 { 337 return likely(sk->sk_state != TCP_TIME_WAIT) ? 338 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 339 } 340 #else 341 #define __ipv6_only_sock(sk) 0 342 #define ipv6_only_sock(sk) 0 343 344 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 345 { 346 return NULL; 347 } 348 349 static inline struct inet6_request_sock * 350 inet6_rsk(const struct request_sock *rsk) 351 { 352 return NULL; 353 } 354 355 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 356 { 357 return NULL; 358 } 359 360 #define __inet6_rcv_saddr(__sk) NULL 361 #define inet6_rcv_saddr(__sk) NULL 362 #define tcp_twsk_ipv6only(__sk) 0 363 #define inet_v6_ipv6only(__sk) 0 364 #endif /* IS_ENABLED(CONFIG_IPV6) */ 365 366 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\ 367 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 368 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \ 369 ((__sk)->sk_family == AF_INET6) && \ 370 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 371 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 372 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 373 374 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \ 375 (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \ 376 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \ 377 ((__sk)->sk_family == PF_INET6) && \ 378 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \ 379 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \ 380 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 381 382 #endif /* _IPV6_H */ 383