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 }; 105 106 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 107 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 108 109 static inline int inet6_iif(const struct sk_buff *skb) 110 { 111 return IP6CB(skb)->iif; 112 } 113 114 struct inet6_request_sock { 115 struct in6_addr loc_addr; 116 struct in6_addr rmt_addr; 117 struct sk_buff *pktopts; 118 int iif; 119 }; 120 121 struct tcp6_request_sock { 122 struct tcp_request_sock tcp6rsk_tcp; 123 struct inet6_request_sock tcp6rsk_inet6; 124 }; 125 126 struct ipv6_mc_socklist; 127 struct ipv6_ac_socklist; 128 struct ipv6_fl_socklist; 129 130 /** 131 * struct ipv6_pinfo - ipv6 private area 132 * 133 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 134 * this _must_ be the last member, so that inet6_sk_generic 135 * is able to calculate its offset from the base struct sock 136 * by using the struct proto->slab_obj_size member. -acme 137 */ 138 struct ipv6_pinfo { 139 struct in6_addr saddr; 140 struct in6_addr rcv_saddr; 141 struct in6_addr daddr; 142 struct in6_pktinfo sticky_pktinfo; 143 const struct in6_addr *daddr_cache; 144 #ifdef CONFIG_IPV6_SUBTREES 145 const struct in6_addr *saddr_cache; 146 #endif 147 148 __be32 flow_label; 149 __u32 frag_size; 150 151 /* 152 * Packed in 16bits. 153 * Omit one shift by by putting the signed field at MSB. 154 */ 155 #if defined(__BIG_ENDIAN_BITFIELD) 156 __s16 hop_limit:9; 157 __u16 __unused_1:7; 158 #else 159 __u16 __unused_1:7; 160 __s16 hop_limit:9; 161 #endif 162 163 #if defined(__BIG_ENDIAN_BITFIELD) 164 /* Packed in 16bits. */ 165 __s16 mcast_hops:9; 166 __u16 __unused_2:6, 167 mc_loop:1; 168 #else 169 __u16 mc_loop:1, 170 __unused_2:6; 171 __s16 mcast_hops:9; 172 #endif 173 int ucast_oif; 174 int mcast_oif; 175 176 /* pktoption flags */ 177 union { 178 struct { 179 __u16 srcrt:1, 180 osrcrt:1, 181 rxinfo:1, 182 rxoinfo:1, 183 rxhlim:1, 184 rxohlim:1, 185 hopopts:1, 186 ohopopts:1, 187 dstopts:1, 188 odstopts:1, 189 rxflow:1, 190 rxtclass:1, 191 rxpmtu:1, 192 rxorigdstaddr:1; 193 /* 2 bits hole */ 194 } bits; 195 __u16 all; 196 } rxopt; 197 198 /* sockopt flags */ 199 __u16 recverr:1, 200 sndflow:1, 201 pmtudisc:2, 202 ipv6only:1, 203 srcprefs:3, /* 001: prefer temporary address 204 * 010: prefer public address 205 * 100: prefer care-of address 206 */ 207 dontfrag:1; 208 __u8 min_hopcount; 209 __u8 tclass; 210 __u8 rcv_tclass; 211 212 __u32 dst_cookie; 213 __u32 rx_dst_cookie; 214 215 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 216 struct ipv6_ac_socklist *ipv6_ac_list; 217 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 218 219 struct ipv6_txoptions *opt; 220 struct sk_buff *pktoptions; 221 struct sk_buff *rxpmtu; 222 struct { 223 struct ipv6_txoptions *opt; 224 u8 hop_limit; 225 u8 tclass; 226 } cork; 227 }; 228 229 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 230 struct raw6_sock { 231 /* inet_sock has to be the first member of raw6_sock */ 232 struct inet_sock inet; 233 __u32 checksum; /* perform checksum */ 234 __u32 offset; /* checksum offset */ 235 struct icmp6_filter filter; 236 __u32 ip6mr_table; 237 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 238 struct ipv6_pinfo inet6; 239 }; 240 241 struct udp6_sock { 242 struct udp_sock udp; 243 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 244 struct ipv6_pinfo inet6; 245 }; 246 247 struct tcp6_sock { 248 struct tcp_sock tcp; 249 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 250 struct ipv6_pinfo inet6; 251 }; 252 253 extern int inet6_sk_rebuild_header(struct sock *sk); 254 255 struct inet6_timewait_sock { 256 struct in6_addr tw_v6_daddr; 257 struct in6_addr tw_v6_rcv_saddr; 258 }; 259 260 struct tcp6_timewait_sock { 261 struct tcp_timewait_sock tcp6tw_tcp; 262 struct inet6_timewait_sock tcp6tw_inet6; 263 }; 264 265 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 266 { 267 return (struct inet6_timewait_sock *)(((u8 *)sk) + 268 inet_twsk(sk)->tw_ipv6_offset); 269 } 270 271 #if IS_ENABLED(CONFIG_IPV6) 272 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 273 { 274 return inet_sk(__sk)->pinet6; 275 } 276 277 static inline struct inet6_request_sock * 278 inet6_rsk(const struct request_sock *rsk) 279 { 280 return (struct inet6_request_sock *)(((u8 *)rsk) + 281 inet_rsk(rsk)->inet6_rsk_offset); 282 } 283 284 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 285 { 286 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 287 } 288 289 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 290 { 291 struct request_sock *req = reqsk_alloc(ops); 292 293 if (req != NULL) { 294 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 295 inet6_rsk(req)->pktopts = NULL; 296 } 297 298 return req; 299 } 300 301 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 302 { 303 return (struct raw6_sock *)sk; 304 } 305 306 static inline void inet_sk_copy_descendant(struct sock *sk_to, 307 const struct sock *sk_from) 308 { 309 int ancestor_size = sizeof(struct inet_sock); 310 311 if (sk_from->sk_family == PF_INET6) 312 ancestor_size += sizeof(struct ipv6_pinfo); 313 314 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 315 } 316 317 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 318 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 319 320 static inline u16 inet6_tw_offset(const struct proto *prot) 321 { 322 return prot->twsk_prot->twsk_obj_size - 323 sizeof(struct inet6_timewait_sock); 324 } 325 326 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 327 { 328 return likely(sk->sk_state != TCP_TIME_WAIT) ? 329 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 330 } 331 332 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 333 { 334 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 335 } 336 337 static inline int inet_v6_ipv6only(const struct sock *sk) 338 { 339 return likely(sk->sk_state != TCP_TIME_WAIT) ? 340 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 341 } 342 #else 343 #define __ipv6_only_sock(sk) 0 344 #define ipv6_only_sock(sk) 0 345 346 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 347 { 348 return NULL; 349 } 350 351 static inline struct inet6_request_sock * 352 inet6_rsk(const struct request_sock *rsk) 353 { 354 return NULL; 355 } 356 357 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 358 { 359 return NULL; 360 } 361 362 #define __inet6_rcv_saddr(__sk) NULL 363 #define inet6_rcv_saddr(__sk) NULL 364 #define tcp_twsk_ipv6only(__sk) 0 365 #define inet_v6_ipv6only(__sk) 0 366 #endif /* IS_ENABLED(CONFIG_IPV6) */ 367 368 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \ 369 ((inet_sk(__sk)->inet_portpair == (__ports)) && \ 370 ((__sk)->sk_family == AF_INET6) && \ 371 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 372 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 373 (!(__sk)->sk_bound_dev_if || \ 374 ((__sk)->sk_bound_dev_if == (__dif))) && \ 375 net_eq(sock_net(__sk), (__net))) 376 377 #define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \ 378 ((inet_twsk(__sk)->tw_portpair == (__ports)) && \ 379 ((__sk)->sk_family == AF_INET6) && \ 380 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)) && \ 381 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \ 382 (!(__sk)->sk_bound_dev_if || \ 383 ((__sk)->sk_bound_dev_if == (__dif))) && \ 384 net_eq(sock_net(__sk), (__net))) 385 386 #endif /* _IPV6_H */ 387