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 __s32 accept_ra_from_local; 43 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 44 __s32 optimistic_dad; 45 #endif 46 #ifdef CONFIG_IPV6_MROUTE 47 __s32 mc_forwarding; 48 #endif 49 __s32 disable_ipv6; 50 __s32 accept_dad; 51 __s32 force_tllao; 52 __s32 ndisc_notify; 53 __s32 suppress_frag_ndisc; 54 void *sysctl; 55 }; 56 57 struct ipv6_params { 58 __s32 disable_ipv6; 59 __s32 autoconf; 60 }; 61 extern struct ipv6_params ipv6_defaults; 62 #include <linux/icmpv6.h> 63 #include <linux/tcp.h> 64 #include <linux/udp.h> 65 66 #include <net/inet_sock.h> 67 68 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 69 { 70 return (struct ipv6hdr *)skb_network_header(skb); 71 } 72 73 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 74 { 75 return (struct ipv6hdr *)skb_inner_network_header(skb); 76 } 77 78 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 79 { 80 return (struct ipv6hdr *)skb_transport_header(skb); 81 } 82 83 /* 84 This structure contains results of exthdrs parsing 85 as offsets from skb->nh. 86 */ 87 88 struct inet6_skb_parm { 89 int iif; 90 __be16 ra; 91 __u16 hop; 92 __u16 dst0; 93 __u16 srcrt; 94 __u16 dst1; 95 __u16 lastopt; 96 __u16 nhoff; 97 __u16 flags; 98 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 99 __u16 dsthao; 100 #endif 101 __u16 frag_max_size; 102 103 #define IP6SKB_XFRM_TRANSFORMED 1 104 #define IP6SKB_FORWARDED 2 105 #define IP6SKB_REROUTED 4 106 #define IP6SKB_ROUTERALERT 8 107 #define IP6SKB_FRAGMENTED 16 108 }; 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 tcp6_request_sock { 119 struct tcp_request_sock tcp6rsk_tcp; 120 }; 121 122 struct ipv6_mc_socklist; 123 struct ipv6_ac_socklist; 124 struct ipv6_fl_socklist; 125 126 /** 127 * struct ipv6_pinfo - ipv6 private area 128 * 129 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 130 * this _must_ be the last member, so that inet6_sk_generic 131 * is able to calculate its offset from the base struct sock 132 * by using the struct proto->slab_obj_size member. -acme 133 */ 134 struct ipv6_pinfo { 135 struct in6_addr saddr; 136 struct in6_pktinfo sticky_pktinfo; 137 const struct in6_addr *daddr_cache; 138 #ifdef CONFIG_IPV6_SUBTREES 139 const struct in6_addr *saddr_cache; 140 #endif 141 142 __be32 flow_label; 143 __u32 frag_size; 144 145 /* 146 * Packed in 16bits. 147 * Omit one shift by by putting the signed field at MSB. 148 */ 149 #if defined(__BIG_ENDIAN_BITFIELD) 150 __s16 hop_limit:9; 151 __u16 __unused_1:7; 152 #else 153 __u16 __unused_1:7; 154 __s16 hop_limit:9; 155 #endif 156 157 #if defined(__BIG_ENDIAN_BITFIELD) 158 /* Packed in 16bits. */ 159 __s16 mcast_hops:9; 160 __u16 __unused_2:6, 161 mc_loop:1; 162 #else 163 __u16 mc_loop:1, 164 __unused_2:6; 165 __s16 mcast_hops:9; 166 #endif 167 int ucast_oif; 168 int mcast_oif; 169 170 /* pktoption flags */ 171 union { 172 struct { 173 __u16 srcrt:1, 174 osrcrt:1, 175 rxinfo:1, 176 rxoinfo:1, 177 rxhlim:1, 178 rxohlim:1, 179 hopopts:1, 180 ohopopts:1, 181 dstopts:1, 182 odstopts:1, 183 rxflow:1, 184 rxtclass:1, 185 rxpmtu:1, 186 rxorigdstaddr:1; 187 /* 2 bits hole */ 188 } bits; 189 __u16 all; 190 } rxopt; 191 192 /* sockopt flags */ 193 __u16 recverr:1, 194 sndflow:1, 195 repflow:1, 196 pmtudisc:3, 197 padding:1, /* 1 bit hole */ 198 srcprefs:3, /* 001: prefer temporary address 199 * 010: prefer public address 200 * 100: prefer care-of address 201 */ 202 dontfrag:1, 203 autoflowlabel:1; 204 __u8 min_hopcount; 205 __u8 tclass; 206 __be32 rcv_flowinfo; 207 208 __u32 dst_cookie; 209 __u32 rx_dst_cookie; 210 211 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 212 struct ipv6_ac_socklist *ipv6_ac_list; 213 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 214 215 struct ipv6_txoptions *opt; 216 struct sk_buff *pktoptions; 217 struct sk_buff *rxpmtu; 218 struct { 219 struct ipv6_txoptions *opt; 220 u8 hop_limit; 221 u8 tclass; 222 } cork; 223 }; 224 225 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 226 struct raw6_sock { 227 /* inet_sock has to be the first member of raw6_sock */ 228 struct inet_sock inet; 229 __u32 checksum; /* perform checksum */ 230 __u32 offset; /* checksum offset */ 231 struct icmp6_filter filter; 232 __u32 ip6mr_table; 233 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 234 struct ipv6_pinfo inet6; 235 }; 236 237 struct udp6_sock { 238 struct udp_sock udp; 239 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 240 struct ipv6_pinfo inet6; 241 }; 242 243 struct tcp6_sock { 244 struct tcp_sock tcp; 245 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 246 struct ipv6_pinfo inet6; 247 }; 248 249 extern int inet6_sk_rebuild_header(struct sock *sk); 250 251 struct tcp6_timewait_sock { 252 struct tcp_timewait_sock tcp6tw_tcp; 253 }; 254 255 #if IS_ENABLED(CONFIG_IPV6) 256 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 257 { 258 return inet_sk(__sk)->pinet6; 259 } 260 261 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 262 { 263 return (struct raw6_sock *)sk; 264 } 265 266 static inline void inet_sk_copy_descendant(struct sock *sk_to, 267 const struct sock *sk_from) 268 { 269 int ancestor_size = sizeof(struct inet_sock); 270 271 if (sk_from->sk_family == PF_INET6) 272 ancestor_size += sizeof(struct ipv6_pinfo); 273 274 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 275 } 276 277 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 278 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 279 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 280 inet6_sk(sk)->rxopt.bits.rxinfo) 281 282 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 283 { 284 if (sk->sk_family == AF_INET6) 285 return &sk->sk_v6_rcv_saddr; 286 return NULL; 287 } 288 289 static inline int inet_v6_ipv6only(const struct sock *sk) 290 { 291 /* ipv6only field is at same position for timewait and other sockets */ 292 return ipv6_only_sock(sk); 293 } 294 #else 295 #define __ipv6_only_sock(sk) 0 296 #define ipv6_only_sock(sk) 0 297 #define ipv6_sk_rxinfo(sk) 0 298 299 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 300 { 301 return NULL; 302 } 303 304 static inline struct inet6_request_sock * 305 inet6_rsk(const struct request_sock *rsk) 306 { 307 return NULL; 308 } 309 310 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 311 { 312 return NULL; 313 } 314 315 #define inet6_rcv_saddr(__sk) NULL 316 #define tcp_twsk_ipv6only(__sk) 0 317 #define inet_v6_ipv6only(__sk) 0 318 #endif /* IS_ENABLED(CONFIG_IPV6) */ 319 320 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif) \ 321 (((__sk)->sk_portpair == (__ports)) && \ 322 ((__sk)->sk_family == AF_INET6) && \ 323 ipv6_addr_equal(&(__sk)->sk_v6_daddr, (__saddr)) && \ 324 ipv6_addr_equal(&(__sk)->sk_v6_rcv_saddr, (__daddr)) && \ 325 (!(__sk)->sk_bound_dev_if || \ 326 ((__sk)->sk_bound_dev_if == (__dif))) && \ 327 net_eq(sock_net(__sk), (__net))) 328 329 #endif /* _IPV6_H */ 330