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