1 #ifndef _IPV6_H 2 #define _IPV6_H 3 4 #include <linux/config.h> 5 #include <linux/in6.h> 6 #include <asm/byteorder.h> 7 8 /* The latest drafts declared increase in minimal mtu up to 1280. */ 9 10 #define IPV6_MIN_MTU 1280 11 12 /* 13 * Advanced API 14 * source interface/address selection, source routing, etc... 15 * *under construction* 16 */ 17 18 19 struct in6_pktinfo { 20 struct in6_addr ipi6_addr; 21 int ipi6_ifindex; 22 }; 23 24 25 struct in6_ifreq { 26 struct in6_addr ifr6_addr; 27 __u32 ifr6_prefixlen; 28 int ifr6_ifindex; 29 }; 30 31 #define IPV6_SRCRT_STRICT 0x01 /* this hop must be a neighbor */ 32 #define IPV6_SRCRT_TYPE_0 0 /* IPv6 type 0 Routing Header */ 33 34 /* 35 * routing header 36 */ 37 struct ipv6_rt_hdr { 38 __u8 nexthdr; 39 __u8 hdrlen; 40 __u8 type; 41 __u8 segments_left; 42 43 /* 44 * type specific data 45 * variable length field 46 */ 47 }; 48 49 50 struct ipv6_opt_hdr { 51 __u8 nexthdr; 52 __u8 hdrlen; 53 /* 54 * TLV encoded option data follows. 55 */ 56 }; 57 58 #define ipv6_destopt_hdr ipv6_opt_hdr 59 #define ipv6_hopopt_hdr ipv6_opt_hdr 60 61 #ifdef __KERNEL__ 62 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3) 63 #endif 64 65 /* 66 * routing header type 0 (used in cmsghdr struct) 67 */ 68 69 struct rt0_hdr { 70 struct ipv6_rt_hdr rt_hdr; 71 __u32 bitmap; /* strict/loose bit map */ 72 struct in6_addr addr[0]; 73 74 #define rt0_type rt_hdr.type 75 }; 76 77 struct ipv6_auth_hdr { 78 __u8 nexthdr; 79 __u8 hdrlen; /* This one is measured in 32 bit units! */ 80 __u16 reserved; 81 __u32 spi; 82 __u32 seq_no; /* Sequence number */ 83 __u8 auth_data[0]; /* Length variable but >=4. Mind the 64 bit alignment! */ 84 }; 85 86 struct ipv6_esp_hdr { 87 __u32 spi; 88 __u32 seq_no; /* Sequence number */ 89 __u8 enc_data[0]; /* Length variable but >=8. Mind the 64 bit alignment! */ 90 }; 91 92 struct ipv6_comp_hdr { 93 __u8 nexthdr; 94 __u8 flags; 95 __u16 cpi; 96 }; 97 98 /* 99 * IPv6 fixed header 100 * 101 * BEWARE, it is incorrect. The first 4 bits of flow_lbl 102 * are glued to priority now, forming "class". 103 */ 104 105 struct ipv6hdr { 106 #if defined(__LITTLE_ENDIAN_BITFIELD) 107 __u8 priority:4, 108 version:4; 109 #elif defined(__BIG_ENDIAN_BITFIELD) 110 __u8 version:4, 111 priority:4; 112 #else 113 #error "Please fix <asm/byteorder.h>" 114 #endif 115 __u8 flow_lbl[3]; 116 117 __u16 payload_len; 118 __u8 nexthdr; 119 __u8 hop_limit; 120 121 struct in6_addr saddr; 122 struct in6_addr daddr; 123 }; 124 125 /* 126 * This structure contains configuration options per IPv6 link. 127 */ 128 struct ipv6_devconf { 129 __s32 forwarding; 130 __s32 hop_limit; 131 __s32 mtu6; 132 __s32 accept_ra; 133 __s32 accept_redirects; 134 __s32 autoconf; 135 __s32 dad_transmits; 136 __s32 rtr_solicits; 137 __s32 rtr_solicit_interval; 138 __s32 rtr_solicit_delay; 139 __s32 force_mld_version; 140 #ifdef CONFIG_IPV6_PRIVACY 141 __s32 use_tempaddr; 142 __s32 temp_valid_lft; 143 __s32 temp_prefered_lft; 144 __s32 regen_max_retry; 145 __s32 max_desync_factor; 146 #endif 147 __s32 max_addresses; 148 void *sysctl; 149 }; 150 151 /* index values for the variables in ipv6_devconf */ 152 enum { 153 DEVCONF_FORWARDING = 0, 154 DEVCONF_HOPLIMIT, 155 DEVCONF_MTU6, 156 DEVCONF_ACCEPT_RA, 157 DEVCONF_ACCEPT_REDIRECTS, 158 DEVCONF_AUTOCONF, 159 DEVCONF_DAD_TRANSMITS, 160 DEVCONF_RTR_SOLICITS, 161 DEVCONF_RTR_SOLICIT_INTERVAL, 162 DEVCONF_RTR_SOLICIT_DELAY, 163 DEVCONF_USE_TEMPADDR, 164 DEVCONF_TEMP_VALID_LFT, 165 DEVCONF_TEMP_PREFERED_LFT, 166 DEVCONF_REGEN_MAX_RETRY, 167 DEVCONF_MAX_DESYNC_FACTOR, 168 DEVCONF_MAX_ADDRESSES, 169 DEVCONF_FORCE_MLD_VERSION, 170 DEVCONF_MAX 171 }; 172 173 #ifdef __KERNEL__ 174 #include <linux/in6.h> /* struct sockaddr_in6 */ 175 #include <linux/icmpv6.h> 176 #include <net/if_inet6.h> /* struct ipv6_mc_socklist */ 177 #include <linux/tcp.h> 178 #include <linux/udp.h> 179 180 /* 181 This structure contains results of exthdrs parsing 182 as offsets from skb->nh. 183 */ 184 185 struct inet6_skb_parm { 186 int iif; 187 __u16 ra; 188 __u16 hop; 189 __u16 dst0; 190 __u16 srcrt; 191 __u16 dst1; 192 }; 193 194 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 195 196 static inline int inet6_iif(const struct sk_buff *skb) 197 { 198 return IP6CB(skb)->iif; 199 } 200 201 struct tcp6_request_sock { 202 struct tcp_request_sock req; 203 struct in6_addr loc_addr; 204 struct in6_addr rmt_addr; 205 struct sk_buff *pktopts; 206 int iif; 207 }; 208 209 static inline struct tcp6_request_sock *tcp6_rsk(const struct request_sock *sk) 210 { 211 return (struct tcp6_request_sock *)sk; 212 } 213 214 /** 215 * struct ipv6_pinfo - ipv6 private area 216 * 217 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 218 * this _must_ be the last member, so that inet6_sk_generic 219 * is able to calculate its offset from the base struct sock 220 * by using the struct proto->slab_obj_size member. -acme 221 */ 222 struct ipv6_pinfo { 223 struct in6_addr saddr; 224 struct in6_addr rcv_saddr; 225 struct in6_addr daddr; 226 struct in6_addr *daddr_cache; 227 228 __u32 flow_label; 229 __u32 frag_size; 230 __s16 hop_limit; 231 __s16 mcast_hops; 232 int mcast_oif; 233 234 /* pktoption flags */ 235 union { 236 struct { 237 __u8 srcrt:2, 238 rxinfo:1, 239 rxhlim:1, 240 hopopts:1, 241 dstopts:1, 242 rxflow:1; 243 } bits; 244 __u8 all; 245 } rxopt; 246 247 /* sockopt flags */ 248 __u8 mc_loop:1, 249 recverr:1, 250 sndflow:1, 251 pmtudisc:2, 252 ipv6only:1; 253 254 __u32 dst_cookie; 255 256 struct ipv6_mc_socklist *ipv6_mc_list; 257 struct ipv6_ac_socklist *ipv6_ac_list; 258 struct ipv6_fl_socklist *ipv6_fl_list; 259 260 struct ipv6_txoptions *opt; 261 struct sk_buff *pktoptions; 262 struct { 263 struct ipv6_txoptions *opt; 264 struct rt6_info *rt; 265 int hop_limit; 266 } cork; 267 }; 268 269 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 270 struct raw6_sock { 271 /* inet_sock has to be the first member of raw6_sock */ 272 struct inet_sock inet; 273 __u32 checksum; /* perform checksum */ 274 __u32 offset; /* checksum offset */ 275 struct icmp6_filter filter; 276 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 277 struct ipv6_pinfo inet6; 278 }; 279 280 struct udp6_sock { 281 struct udp_sock udp; 282 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 283 struct ipv6_pinfo inet6; 284 }; 285 286 struct tcp6_sock { 287 struct tcp_sock tcp; 288 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 289 struct ipv6_pinfo inet6; 290 }; 291 292 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 293 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 294 { 295 return inet_sk(__sk)->pinet6; 296 } 297 298 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 299 { 300 return (struct raw6_sock *)sk; 301 } 302 303 static inline void inet_sk_copy_descendant(struct sock *sk_to, 304 const struct sock *sk_from) 305 { 306 int ancestor_size = sizeof(struct inet_sock); 307 308 if (sk_from->sk_family == PF_INET6) 309 ancestor_size += sizeof(struct ipv6_pinfo); 310 311 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 312 } 313 314 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 315 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 316 317 #include <linux/tcp.h> 318 319 struct tcp6_timewait_sock { 320 struct tcp_timewait_sock tw_v6_sk; 321 struct in6_addr tw_v6_daddr; 322 struct in6_addr tw_v6_rcv_saddr; 323 }; 324 325 static inline struct tcp6_timewait_sock *tcp6_twsk(const struct sock *sk) 326 { 327 return (struct tcp6_timewait_sock *)sk; 328 } 329 330 static inline struct in6_addr *__tcp_v6_rcv_saddr(const struct sock *sk) 331 { 332 return likely(sk->sk_state != TCP_TIME_WAIT) ? 333 &inet6_sk(sk)->rcv_saddr : &tcp6_twsk(sk)->tw_v6_rcv_saddr; 334 } 335 336 static inline struct in6_addr *tcp_v6_rcv_saddr(const struct sock *sk) 337 { 338 return sk->sk_family == AF_INET6 ? __tcp_v6_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 raw6_sock *raw6_sk(const struct sock *sk) 356 { 357 return NULL; 358 } 359 360 #define __tcp_v6_rcv_saddr(__sk) NULL 361 #define tcp_v6_rcv_saddr(__sk) NULL 362 #define tcp_twsk_ipv6only(__sk) 0 363 #define inet_v6_ipv6only(__sk) 0 364 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ 365 366 #define INET6_MATCH(__sk, __saddr, __daddr, __ports, __dif) \ 367 (((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports)) && \ 368 ((__sk)->sk_family == AF_INET6) && \ 369 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \ 370 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \ 371 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) 372 373 #endif /* __KERNEL__ */ 374 375 #endif /* _IPV6_H */ 376