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 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2) 8 /* 9 * This structure contains configuration options per IPv6 link. 10 */ 11 struct ipv6_devconf { 12 __s32 forwarding; 13 __s32 hop_limit; 14 __s32 mtu6; 15 __s32 accept_ra; 16 __s32 accept_redirects; 17 __s32 autoconf; 18 __s32 dad_transmits; 19 __s32 rtr_solicits; 20 __s32 rtr_solicit_interval; 21 __s32 rtr_solicit_delay; 22 __s32 force_mld_version; 23 __s32 mldv1_unsolicited_report_interval; 24 __s32 mldv2_unsolicited_report_interval; 25 __s32 use_tempaddr; 26 __s32 temp_valid_lft; 27 __s32 temp_prefered_lft; 28 __s32 regen_max_retry; 29 __s32 max_desync_factor; 30 __s32 max_addresses; 31 __s32 accept_ra_defrtr; 32 __s32 accept_ra_pinfo; 33 #ifdef CONFIG_IPV6_ROUTER_PREF 34 __s32 accept_ra_rtr_pref; 35 __s32 rtr_probe_interval; 36 #ifdef CONFIG_IPV6_ROUTE_INFO 37 __s32 accept_ra_rt_info_max_plen; 38 #endif 39 #endif 40 __s32 proxy_ndp; 41 __s32 accept_source_route; 42 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 43 __s32 optimistic_dad; 44 #endif 45 #ifdef CONFIG_IPV6_MROUTE 46 __s32 mc_forwarding; 47 #endif 48 __s32 disable_ipv6; 49 __s32 accept_dad; 50 __s32 force_tllao; 51 __s32 ndisc_notify; 52 __s32 suppress_frag_ndisc; 53 void *sysctl; 54 }; 55 56 struct ipv6_params { 57 __s32 disable_ipv6; 58 __s32 autoconf; 59 }; 60 extern struct ipv6_params ipv6_defaults; 61 #include <linux/icmpv6.h> 62 #include <linux/tcp.h> 63 #include <linux/udp.h> 64 65 #include <net/inet_sock.h> 66 67 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 68 { 69 return (struct ipv6hdr *)skb_network_header(skb); 70 } 71 72 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 73 { 74 return (struct ipv6hdr *)skb_inner_network_header(skb); 75 } 76 77 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 78 { 79 return (struct ipv6hdr *)skb_transport_header(skb); 80 } 81 82 /* 83 This structure contains results of exthdrs parsing 84 as offsets from skb->nh. 85 */ 86 87 struct inet6_skb_parm { 88 int iif; 89 __be16 ra; 90 __u16 hop; 91 __u16 dst0; 92 __u16 srcrt; 93 __u16 dst1; 94 __u16 lastopt; 95 __u16 nhoff; 96 __u16 flags; 97 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 98 __u16 dsthao; 99 #endif 100 __u16 frag_max_size; 101 102 #define IP6SKB_XFRM_TRANSFORMED 1 103 #define IP6SKB_FORWARDED 2 104 #define IP6SKB_REROUTED 4 105 #define IP6SKB_ROUTERALERT 8 106 #define IP6SKB_FRAGMENTED 16 107 }; 108 109 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 110 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 111 112 static inline int inet6_iif(const struct sk_buff *skb) 113 { 114 return IP6CB(skb)->iif; 115 } 116 117 struct tcp6_request_sock { 118 struct tcp_request_sock tcp6rsk_tcp; 119 }; 120 121 struct ipv6_mc_socklist; 122 struct ipv6_ac_socklist; 123 struct ipv6_fl_socklist; 124 125 /** 126 * struct ipv6_pinfo - ipv6 private area 127 * 128 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 129 * this _must_ be the last member, so that inet6_sk_generic 130 * is able to calculate its offset from the base struct sock 131 * by using the struct proto->slab_obj_size member. -acme 132 */ 133 struct ipv6_pinfo { 134 struct in6_addr saddr; 135 struct in6_pktinfo sticky_pktinfo; 136 const struct in6_addr *daddr_cache; 137 #ifdef CONFIG_IPV6_SUBTREES 138 const struct in6_addr *saddr_cache; 139 #endif 140 141 __be32 flow_label; 142 __u32 frag_size; 143 144 /* 145 * Packed in 16bits. 146 * Omit one shift by by putting the signed field at MSB. 147 */ 148 #if defined(__BIG_ENDIAN_BITFIELD) 149 __s16 hop_limit:9; 150 __u16 __unused_1:7; 151 #else 152 __u16 __unused_1:7; 153 __s16 hop_limit:9; 154 #endif 155 156 #if defined(__BIG_ENDIAN_BITFIELD) 157 /* Packed in 16bits. */ 158 __s16 mcast_hops:9; 159 __u16 __unused_2:6, 160 mc_loop:1; 161 #else 162 __u16 mc_loop:1, 163 __unused_2:6; 164 __s16 mcast_hops:9; 165 #endif 166 int ucast_oif; 167 int mcast_oif; 168 169 /* pktoption flags */ 170 union { 171 struct { 172 __u16 srcrt:1, 173 osrcrt:1, 174 rxinfo:1, 175 rxoinfo:1, 176 rxhlim:1, 177 rxohlim:1, 178 hopopts:1, 179 ohopopts:1, 180 dstopts:1, 181 odstopts:1, 182 rxflow:1, 183 rxtclass:1, 184 rxpmtu:1, 185 rxorigdstaddr:1; 186 /* 2 bits hole */ 187 } bits; 188 __u16 all; 189 } rxopt; 190 191 /* sockopt flags */ 192 __u16 recverr:1, 193 sndflow:1, 194 pmtudisc:2, 195 ipv6only:1, 196 srcprefs:3, /* 001: prefer temporary address 197 * 010: prefer public address 198 * 100: prefer care-of address 199 */ 200 dontfrag:1; 201 __u8 min_hopcount; 202 __u8 tclass; 203 __u8 rcv_tclass; 204 205 __u32 dst_cookie; 206 __u32 rx_dst_cookie; 207 208 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 209 struct ipv6_ac_socklist *ipv6_ac_list; 210 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 211 212 struct ipv6_txoptions *opt; 213 struct sk_buff *pktoptions; 214 struct sk_buff *rxpmtu; 215 struct { 216 struct ipv6_txoptions *opt; 217 u8 hop_limit; 218 u8 tclass; 219 } cork; 220 }; 221 222 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 223 struct raw6_sock { 224 /* inet_sock has to be the first member of raw6_sock */ 225 struct inet_sock inet; 226 __u32 checksum; /* perform checksum */ 227 __u32 offset; /* checksum offset */ 228 struct icmp6_filter filter; 229 __u32 ip6mr_table; 230 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 231 struct ipv6_pinfo inet6; 232 }; 233 234 struct udp6_sock { 235 struct udp_sock udp; 236 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 237 struct ipv6_pinfo inet6; 238 }; 239 240 struct tcp6_sock { 241 struct tcp_sock tcp; 242 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 243 struct ipv6_pinfo inet6; 244 }; 245 246 extern int inet6_sk_rebuild_header(struct sock *sk); 247 248 struct tcp6_timewait_sock { 249 struct tcp_timewait_sock tcp6tw_tcp; 250 }; 251 252 #if IS_ENABLED(CONFIG_IPV6) 253 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 254 { 255 return inet_sk(__sk)->pinet6; 256 } 257 258 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops) 259 { 260 struct request_sock *req = reqsk_alloc(ops); 261 262 if (req) 263 inet_rsk(req)->pktopts = NULL; 264 265 return req; 266 } 267 268 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 269 { 270 return (struct raw6_sock *)sk; 271 } 272 273 static inline void inet_sk_copy_descendant(struct sock *sk_to, 274 const struct sock *sk_from) 275 { 276 int ancestor_size = sizeof(struct inet_sock); 277 278 if (sk_from->sk_family == PF_INET6) 279 ancestor_size += sizeof(struct ipv6_pinfo); 280 281 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 282 } 283 284 #define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only) 285 #define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk)) 286 287 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 288 { 289 if (sk->sk_family == AF_INET6) 290 return &sk->sk_v6_rcv_saddr; 291 return NULL; 292 } 293 294 static inline int inet_v6_ipv6only(const struct sock *sk) 295 { 296 return likely(sk->sk_state != TCP_TIME_WAIT) ? 297 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only; 298 } 299 #else 300 #define __ipv6_only_sock(sk) 0 301 #define ipv6_only_sock(sk) 0 302 303 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 304 { 305 return NULL; 306 } 307 308 static inline struct inet6_request_sock * 309 inet6_rsk(const struct request_sock *rsk) 310 { 311 return NULL; 312 } 313 314 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 315 { 316 return NULL; 317 } 318 319 #define inet6_rcv_saddr(__sk) NULL 320 #define tcp_twsk_ipv6only(__sk) 0 321 #define inet_v6_ipv6only(__sk) 0 322 #endif /* IS_ENABLED(CONFIG_IPV6) */ 323 324 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \ 325 (((__sk)->sk_portpair == (__ports)) && \ 326 ((__sk)->sk_family == AF_INET6) && \ 327 ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr)) && \ 328 ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr)) && \ 329 (!(__sk)->sk_bound_dev_if || \ 330 ((__sk)->sk_bound_dev_if == (__dif))) && \ 331 net_eq(sock_net(__sk), (__net))) 332 333 #endif /* _IPV6_H */ 334