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 static inline __u8 ipv6_tclass(const struct ipv6hdr *iph) 81 { 82 return (ntohl(*(__be32 *)iph) >> 20) & 0xff; 83 } 84 85 /* 86 This structure contains results of exthdrs parsing 87 as offsets from skb->nh. 88 */ 89 90 struct inet6_skb_parm { 91 int iif; 92 __u16 ra; 93 __u16 hop; 94 __u16 dst0; 95 __u16 srcrt; 96 __u16 dst1; 97 __u16 lastopt; 98 __u16 nhoff; 99 __u16 flags; 100 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 101 __u16 dsthao; 102 #endif 103 __u16 frag_max_size; 104 105 #define IP6SKB_XFRM_TRANSFORMED 1 106 #define IP6SKB_FORWARDED 2 107 #define IP6SKB_REROUTED 4 108 }; 109 110 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 111 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 112 113 static inline int inet6_iif(const struct sk_buff *skb) 114 { 115 return IP6CB(skb)->iif; 116 } 117 118 struct inet6_request_sock { 119 struct in6_addr loc_addr; 120 struct in6_addr rmt_addr; 121 struct sk_buff *pktopts; 122 int iif; 123 }; 124 125 struct tcp6_request_sock { 126 struct tcp_request_sock tcp6rsk_tcp; 127 struct inet6_request_sock tcp6rsk_inet6; 128 }; 129 130 struct ipv6_mc_socklist; 131 struct ipv6_ac_socklist; 132 struct ipv6_fl_socklist; 133 134 /** 135 * struct ipv6_pinfo - ipv6 private area 136 * 137 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 138 * this _must_ be the last member, so that inet6_sk_generic 139 * is able to calculate its offset from the base struct sock 140 * by using the struct proto->slab_obj_size member. -acme 141 */ 142 struct ipv6_pinfo { 143 struct in6_addr saddr; 144 struct in6_addr rcv_saddr; 145 struct in6_addr daddr; 146 struct in6_pktinfo sticky_pktinfo; 147 const struct in6_addr *daddr_cache; 148 #ifdef CONFIG_IPV6_SUBTREES 149 const struct in6_addr *saddr_cache; 150 #endif 151 152 __be32 flow_label; 153 __u32 frag_size; 154 155 /* 156 * Packed in 16bits. 157 * Omit one shift by by putting the signed field at MSB. 158 */ 159 #if defined(__BIG_ENDIAN_BITFIELD) 160 __s16 hop_limit:9; 161 __u16 __unused_1:7; 162 #else 163 __u16 __unused_1:7; 164 __s16 hop_limit:9; 165 #endif 166 167 #if defined(__BIG_ENDIAN_BITFIELD) 168 /* Packed in 16bits. */ 169 __s16 mcast_hops:9; 170 __u16 __unused_2:6, 171 mc_loop:1; 172 #else 173 __u16 mc_loop:1, 174 __unused_2:6; 175 __s16 mcast_hops:9; 176 #endif 177 int ucast_oif; 178 int mcast_oif; 179 180 /* pktoption flags */ 181 union { 182 struct { 183 __u16 srcrt:1, 184 osrcrt:1, 185 rxinfo:1, 186 rxoinfo:1, 187 rxhlim:1, 188 rxohlim:1, 189 hopopts:1, 190 ohopopts:1, 191 dstopts:1, 192 odstopts:1, 193 rxflow:1, 194 rxtclass:1, 195 rxpmtu:1, 196 rxorigdstaddr:1; 197 /* 2 bits hole */ 198 } bits; 199 __u16 all; 200 } rxopt; 201 202 /* sockopt flags */ 203 __u16 recverr:1, 204 sndflow:1, 205 pmtudisc:2, 206 ipv6only:1, 207 srcprefs:3, /* 001: prefer temporary address 208 * 010: prefer public address 209 * 100: prefer care-of address 210 */ 211 dontfrag:1; 212 __u8 min_hopcount; 213 __u8 tclass; 214 __u8 rcv_tclass; 215 216 __u32 dst_cookie; 217 __u32 rx_dst_cookie; 218 219 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 220 struct ipv6_ac_socklist *ipv6_ac_list; 221 struct ipv6_fl_socklist *ipv6_fl_list; 222 223 struct ipv6_txoptions *opt; 224 struct sk_buff *pktoptions; 225 struct sk_buff *rxpmtu; 226 struct { 227 struct ipv6_txoptions *opt; 228 u8 hop_limit; 229 u8 tclass; 230 } cork; 231 }; 232 233 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 234 struct raw6_sock { 235 /* inet_sock has to be the first member of raw6_sock */ 236 struct inet_sock inet; 237 __u32 checksum; /* perform checksum */ 238 __u32 offset; /* checksum offset */ 239 struct icmp6_filter filter; 240 __u32 ip6mr_table; 241 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 242 struct ipv6_pinfo inet6; 243 }; 244 245 struct udp6_sock { 246 struct udp_sock udp; 247 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 248 struct ipv6_pinfo inet6; 249 }; 250 251 struct tcp6_sock { 252 struct tcp_sock tcp; 253 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 254 struct ipv6_pinfo inet6; 255 }; 256 257 extern int inet6_sk_rebuild_header(struct sock *sk); 258 259 struct inet6_timewait_sock { 260 struct in6_addr tw_v6_daddr; 261 struct in6_addr tw_v6_rcv_saddr; 262 }; 263 264 struct tcp6_timewait_sock { 265 struct tcp_timewait_sock tcp6tw_tcp; 266 struct inet6_timewait_sock tcp6tw_inet6; 267 }; 268 269 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk) 270 { 271 return (struct inet6_timewait_sock *)(((u8 *)sk) + 272 inet_twsk(sk)->tw_ipv6_offset); 273 } 274 275 #if IS_ENABLED(CONFIG_IPV6) 276 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 277 { 278 return inet_sk(__sk)->pinet6; 279 } 280 281 static inline struct inet6_request_sock * 282 inet6_rsk(const struct request_sock *rsk) 283 { 284 return (struct inet6_request_sock *)(((u8 *)rsk) + 285 inet_rsk(rsk)->inet6_rsk_offset); 286 } 287 288 static inline u32 inet6_rsk_offset(struct request_sock *rsk) 289 { 290 return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock); 291 } 292 293 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 294 { 295 struct request_sock *req = reqsk_alloc(ops); 296 297 if (req != NULL) { 298 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req); 299 inet6_rsk(req)->pktopts = NULL; 300 } 301 302 return req; 303 } 304 305 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 306 { 307 return (struct raw6_sock *)sk; 308 } 309 310 static inline void inet_sk_copy_descendant(struct sock *sk_to, 311 const struct sock *sk_from) 312 { 313 int ancestor_size = sizeof(struct inet_sock); 314 315 if (sk_from->sk_family == PF_INET6) 316 ancestor_size += sizeof(struct ipv6_pinfo); 317 318 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 319 } 320 321 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 322 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 323 324 static inline u16 inet6_tw_offset(const struct proto *prot) 325 { 326 return prot->twsk_prot->twsk_obj_size - 327 sizeof(struct inet6_timewait_sock); 328 } 329 330 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk) 331 { 332 return likely(sk->sk_state != TCP_TIME_WAIT) ? 333 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr; 334 } 335 336 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 337 { 338 return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL; 339 } 340 341 static inline int inet_v6_ipv6only(const struct sock *sk) 342 { 343 return likely(sk->sk_state != TCP_TIME_WAIT) ? 344 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 345 } 346 #else 347 #define __ipv6_only_sock(sk) 0 348 #define ipv6_only_sock(sk) 0 349 350 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 351 { 352 return NULL; 353 } 354 355 static inline struct inet6_request_sock * 356 inet6_rsk(const struct request_sock *rsk) 357 { 358 return NULL; 359 } 360 361 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 362 { 363 return NULL; 364 } 365 366 #define __inet6_rcv_saddr(__sk) NULL 367 #define inet6_rcv_saddr(__sk) NULL 368 #define tcp_twsk_ipv6only(__sk) 0 369 #define inet_v6_ipv6only(__sk) 0 370 #endif /* IS_ENABLED(CONFIG_IPV6) */ 371 372 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \ 373 ((inet_sk(__sk)->inet_portpair == (__ports)) && \ 374 ((__sk)->sk_family == AF_INET6) && \ 375 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 376 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 377 (!(__sk)->sk_bound_dev_if || \ 378 ((__sk)->sk_bound_dev_if == (__dif))) && \ 379 net_eq(sock_net(__sk), (__net))) 380 381 #define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \ 382 ((inet_twsk(__sk)->tw_portpair == (__ports)) && \ 383 ((__sk)->sk_family == AF_INET6) && \ 384 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)) && \ 385 ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \ 386 (!(__sk)->sk_bound_dev_if || \ 387 ((__sk)->sk_bound_dev_if == (__dif))) && \ 388 net_eq(sock_net(__sk), (__net))) 389 390 #endif /* _IPV6_H */ 391