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_min_hop_limit; 33 __s32 accept_ra_pinfo; 34 __s32 ignore_routes_with_linkdown; 35 #ifdef CONFIG_IPV6_ROUTER_PREF 36 __s32 accept_ra_rtr_pref; 37 __s32 rtr_probe_interval; 38 #ifdef CONFIG_IPV6_ROUTE_INFO 39 __s32 accept_ra_rt_info_max_plen; 40 #endif 41 #endif 42 __s32 proxy_ndp; 43 __s32 accept_source_route; 44 __s32 accept_ra_from_local; 45 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 46 __s32 optimistic_dad; 47 __s32 use_optimistic; 48 #endif 49 #ifdef CONFIG_IPV6_MROUTE 50 __s32 mc_forwarding; 51 #endif 52 __s32 disable_ipv6; 53 __s32 drop_unicast_in_l2_multicast; 54 __s32 accept_dad; 55 __s32 force_tllao; 56 __s32 ndisc_notify; 57 __s32 suppress_frag_ndisc; 58 __s32 accept_ra_mtu; 59 __s32 drop_unsolicited_na; 60 struct ipv6_stable_secret { 61 bool initialized; 62 struct in6_addr secret; 63 } stable_secret; 64 __s32 use_oif_addrs_only; 65 void *sysctl; 66 }; 67 68 struct ipv6_params { 69 __s32 disable_ipv6; 70 __s32 autoconf; 71 }; 72 extern struct ipv6_params ipv6_defaults; 73 #include <linux/icmpv6.h> 74 #include <linux/tcp.h> 75 #include <linux/udp.h> 76 77 #include <net/inet_sock.h> 78 79 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 80 { 81 return (struct ipv6hdr *)skb_network_header(skb); 82 } 83 84 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 85 { 86 return (struct ipv6hdr *)skb_inner_network_header(skb); 87 } 88 89 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 90 { 91 return (struct ipv6hdr *)skb_transport_header(skb); 92 } 93 94 /* 95 This structure contains results of exthdrs parsing 96 as offsets from skb->nh. 97 */ 98 99 struct inet6_skb_parm { 100 int iif; 101 __be16 ra; 102 __u16 dst0; 103 __u16 srcrt; 104 __u16 dst1; 105 __u16 lastopt; 106 __u16 nhoff; 107 __u16 flags; 108 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 109 __u16 dsthao; 110 #endif 111 __u16 frag_max_size; 112 113 #define IP6SKB_XFRM_TRANSFORMED 1 114 #define IP6SKB_FORWARDED 2 115 #define IP6SKB_REROUTED 4 116 #define IP6SKB_ROUTERALERT 8 117 #define IP6SKB_FRAGMENTED 16 118 #define IP6SKB_HOPBYHOP 32 119 }; 120 121 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 122 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 123 124 static inline int inet6_iif(const struct sk_buff *skb) 125 { 126 return IP6CB(skb)->iif; 127 } 128 129 struct tcp6_request_sock { 130 struct tcp_request_sock tcp6rsk_tcp; 131 }; 132 133 struct ipv6_mc_socklist; 134 struct ipv6_ac_socklist; 135 struct ipv6_fl_socklist; 136 137 struct inet6_cork { 138 struct ipv6_txoptions *opt; 139 u8 hop_limit; 140 u8 tclass; 141 }; 142 143 /** 144 * struct ipv6_pinfo - ipv6 private area 145 * 146 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 147 * this _must_ be the last member, so that inet6_sk_generic 148 * is able to calculate its offset from the base struct sock 149 * by using the struct proto->slab_obj_size member. -acme 150 */ 151 struct ipv6_pinfo { 152 struct in6_addr saddr; 153 struct in6_pktinfo sticky_pktinfo; 154 const struct in6_addr *daddr_cache; 155 #ifdef CONFIG_IPV6_SUBTREES 156 const struct in6_addr *saddr_cache; 157 #endif 158 159 __be32 flow_label; 160 __u32 frag_size; 161 162 /* 163 * Packed in 16bits. 164 * Omit one shift by by putting the signed field at MSB. 165 */ 166 #if defined(__BIG_ENDIAN_BITFIELD) 167 __s16 hop_limit:9; 168 __u16 __unused_1:7; 169 #else 170 __u16 __unused_1:7; 171 __s16 hop_limit:9; 172 #endif 173 174 #if defined(__BIG_ENDIAN_BITFIELD) 175 /* Packed in 16bits. */ 176 __s16 mcast_hops:9; 177 __u16 __unused_2:6, 178 mc_loop:1; 179 #else 180 __u16 mc_loop:1, 181 __unused_2:6; 182 __s16 mcast_hops:9; 183 #endif 184 int ucast_oif; 185 int mcast_oif; 186 187 /* pktoption flags */ 188 union { 189 struct { 190 __u16 srcrt:1, 191 osrcrt:1, 192 rxinfo:1, 193 rxoinfo:1, 194 rxhlim:1, 195 rxohlim:1, 196 hopopts:1, 197 ohopopts:1, 198 dstopts:1, 199 odstopts:1, 200 rxflow:1, 201 rxtclass:1, 202 rxpmtu:1, 203 rxorigdstaddr:1; 204 /* 2 bits hole */ 205 } bits; 206 __u16 all; 207 } rxopt; 208 209 /* sockopt flags */ 210 __u16 recverr:1, 211 sndflow:1, 212 repflow:1, 213 pmtudisc:3, 214 padding:1, /* 1 bit hole */ 215 srcprefs:3, /* 001: prefer temporary address 216 * 010: prefer public address 217 * 100: prefer care-of address 218 */ 219 dontfrag:1, 220 autoflowlabel:1; 221 __u8 min_hopcount; 222 __u8 tclass; 223 __be32 rcv_flowinfo; 224 225 __u32 dst_cookie; 226 __u32 rx_dst_cookie; 227 228 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 229 struct ipv6_ac_socklist *ipv6_ac_list; 230 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 231 232 struct ipv6_txoptions __rcu *opt; 233 struct sk_buff *pktoptions; 234 struct sk_buff *rxpmtu; 235 struct inet6_cork cork; 236 }; 237 238 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 239 struct raw6_sock { 240 /* inet_sock has to be the first member of raw6_sock */ 241 struct inet_sock inet; 242 __u32 checksum; /* perform checksum */ 243 __u32 offset; /* checksum offset */ 244 struct icmp6_filter filter; 245 __u32 ip6mr_table; 246 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 247 struct ipv6_pinfo inet6; 248 }; 249 250 struct udp6_sock { 251 struct udp_sock udp; 252 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 253 struct ipv6_pinfo inet6; 254 }; 255 256 struct tcp6_sock { 257 struct tcp_sock tcp; 258 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 259 struct ipv6_pinfo inet6; 260 }; 261 262 extern int inet6_sk_rebuild_header(struct sock *sk); 263 264 struct tcp6_timewait_sock { 265 struct tcp_timewait_sock tcp6tw_tcp; 266 }; 267 268 #if IS_ENABLED(CONFIG_IPV6) 269 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 270 { 271 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 272 } 273 274 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 275 { 276 return (struct raw6_sock *)sk; 277 } 278 279 static inline void inet_sk_copy_descendant(struct sock *sk_to, 280 const struct sock *sk_from) 281 { 282 int ancestor_size = sizeof(struct inet_sock); 283 284 if (sk_from->sk_family == PF_INET6) 285 ancestor_size += sizeof(struct ipv6_pinfo); 286 287 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 288 } 289 290 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 291 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 292 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 293 inet6_sk(sk)->rxopt.bits.rxinfo) 294 295 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 296 { 297 if (sk->sk_family == AF_INET6) 298 return &sk->sk_v6_rcv_saddr; 299 return NULL; 300 } 301 302 static inline int inet_v6_ipv6only(const struct sock *sk) 303 { 304 /* ipv6only field is at same position for timewait and other sockets */ 305 return ipv6_only_sock(sk); 306 } 307 #else 308 #define __ipv6_only_sock(sk) 0 309 #define ipv6_only_sock(sk) 0 310 #define ipv6_sk_rxinfo(sk) 0 311 312 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 313 { 314 return NULL; 315 } 316 317 static inline struct inet6_request_sock * 318 inet6_rsk(const struct request_sock *rsk) 319 { 320 return NULL; 321 } 322 323 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 324 { 325 return NULL; 326 } 327 328 #define inet6_rcv_saddr(__sk) NULL 329 #define tcp_twsk_ipv6only(__sk) 0 330 #define inet_v6_ipv6only(__sk) 0 331 #endif /* IS_ENABLED(CONFIG_IPV6) */ 332 #endif /* _IPV6_H */ 333