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 __s32 keep_addr_on_down; 66 void *sysctl; 67 }; 68 69 struct ipv6_params { 70 __s32 disable_ipv6; 71 __s32 autoconf; 72 }; 73 extern struct ipv6_params ipv6_defaults; 74 #include <linux/icmpv6.h> 75 #include <linux/tcp.h> 76 #include <linux/udp.h> 77 78 #include <net/inet_sock.h> 79 80 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 81 { 82 return (struct ipv6hdr *)skb_network_header(skb); 83 } 84 85 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 86 { 87 return (struct ipv6hdr *)skb_inner_network_header(skb); 88 } 89 90 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 91 { 92 return (struct ipv6hdr *)skb_transport_header(skb); 93 } 94 95 /* 96 This structure contains results of exthdrs parsing 97 as offsets from skb->nh. 98 */ 99 100 struct inet6_skb_parm { 101 int iif; 102 __be16 ra; 103 __u16 dst0; 104 __u16 srcrt; 105 __u16 dst1; 106 __u16 lastopt; 107 __u16 nhoff; 108 __u16 flags; 109 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 110 __u16 dsthao; 111 #endif 112 __u16 frag_max_size; 113 114 #define IP6SKB_XFRM_TRANSFORMED 1 115 #define IP6SKB_FORWARDED 2 116 #define IP6SKB_REROUTED 4 117 #define IP6SKB_ROUTERALERT 8 118 #define IP6SKB_FRAGMENTED 16 119 #define IP6SKB_HOPBYHOP 32 120 }; 121 122 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 123 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 124 125 static inline int inet6_iif(const struct sk_buff *skb) 126 { 127 return IP6CB(skb)->iif; 128 } 129 130 struct tcp6_request_sock { 131 struct tcp_request_sock tcp6rsk_tcp; 132 }; 133 134 struct ipv6_mc_socklist; 135 struct ipv6_ac_socklist; 136 struct ipv6_fl_socklist; 137 138 struct inet6_cork { 139 struct ipv6_txoptions *opt; 140 u8 hop_limit; 141 u8 tclass; 142 }; 143 144 /** 145 * struct ipv6_pinfo - ipv6 private area 146 * 147 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 148 * this _must_ be the last member, so that inet6_sk_generic 149 * is able to calculate its offset from the base struct sock 150 * by using the struct proto->slab_obj_size member. -acme 151 */ 152 struct ipv6_pinfo { 153 struct in6_addr saddr; 154 struct in6_pktinfo sticky_pktinfo; 155 const struct in6_addr *daddr_cache; 156 #ifdef CONFIG_IPV6_SUBTREES 157 const struct in6_addr *saddr_cache; 158 #endif 159 160 __be32 flow_label; 161 __u32 frag_size; 162 163 /* 164 * Packed in 16bits. 165 * Omit one shift by by putting the signed field at MSB. 166 */ 167 #if defined(__BIG_ENDIAN_BITFIELD) 168 __s16 hop_limit:9; 169 __u16 __unused_1:7; 170 #else 171 __u16 __unused_1:7; 172 __s16 hop_limit:9; 173 #endif 174 175 #if defined(__BIG_ENDIAN_BITFIELD) 176 /* Packed in 16bits. */ 177 __s16 mcast_hops:9; 178 __u16 __unused_2:6, 179 mc_loop:1; 180 #else 181 __u16 mc_loop:1, 182 __unused_2:6; 183 __s16 mcast_hops:9; 184 #endif 185 int ucast_oif; 186 int mcast_oif; 187 188 /* pktoption flags */ 189 union { 190 struct { 191 __u16 srcrt:1, 192 osrcrt:1, 193 rxinfo:1, 194 rxoinfo:1, 195 rxhlim:1, 196 rxohlim:1, 197 hopopts:1, 198 ohopopts:1, 199 dstopts:1, 200 odstopts:1, 201 rxflow:1, 202 rxtclass:1, 203 rxpmtu:1, 204 rxorigdstaddr:1; 205 /* 2 bits hole */ 206 } bits; 207 __u16 all; 208 } rxopt; 209 210 /* sockopt flags */ 211 __u16 recverr:1, 212 sndflow:1, 213 repflow:1, 214 pmtudisc:3, 215 padding:1, /* 1 bit hole */ 216 srcprefs:3, /* 001: prefer temporary address 217 * 010: prefer public address 218 * 100: prefer care-of address 219 */ 220 dontfrag:1, 221 autoflowlabel:1; 222 __u8 min_hopcount; 223 __u8 tclass; 224 __be32 rcv_flowinfo; 225 226 __u32 dst_cookie; 227 __u32 rx_dst_cookie; 228 229 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 230 struct ipv6_ac_socklist *ipv6_ac_list; 231 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 232 233 struct ipv6_txoptions __rcu *opt; 234 struct sk_buff *pktoptions; 235 struct sk_buff *rxpmtu; 236 struct inet6_cork cork; 237 }; 238 239 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 240 struct raw6_sock { 241 /* inet_sock has to be the first member of raw6_sock */ 242 struct inet_sock inet; 243 __u32 checksum; /* perform checksum */ 244 __u32 offset; /* checksum offset */ 245 struct icmp6_filter filter; 246 __u32 ip6mr_table; 247 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 248 struct ipv6_pinfo inet6; 249 }; 250 251 struct udp6_sock { 252 struct udp_sock udp; 253 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 254 struct ipv6_pinfo inet6; 255 }; 256 257 struct tcp6_sock { 258 struct tcp_sock tcp; 259 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 260 struct ipv6_pinfo inet6; 261 }; 262 263 extern int inet6_sk_rebuild_header(struct sock *sk); 264 265 struct tcp6_timewait_sock { 266 struct tcp_timewait_sock tcp6tw_tcp; 267 }; 268 269 #if IS_ENABLED(CONFIG_IPV6) 270 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 271 { 272 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 273 } 274 275 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 276 { 277 return (struct raw6_sock *)sk; 278 } 279 280 static inline void inet_sk_copy_descendant(struct sock *sk_to, 281 const struct sock *sk_from) 282 { 283 int ancestor_size = sizeof(struct inet_sock); 284 285 if (sk_from->sk_family == PF_INET6) 286 ancestor_size += sizeof(struct ipv6_pinfo); 287 288 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 289 } 290 291 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 292 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 293 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 294 inet6_sk(sk)->rxopt.bits.rxinfo) 295 296 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 297 { 298 if (sk->sk_family == AF_INET6) 299 return &sk->sk_v6_rcv_saddr; 300 return NULL; 301 } 302 303 static inline int inet_v6_ipv6only(const struct sock *sk) 304 { 305 /* ipv6only field is at same position for timewait and other sockets */ 306 return ipv6_only_sock(sk); 307 } 308 #else 309 #define __ipv6_only_sock(sk) 0 310 #define ipv6_only_sock(sk) 0 311 #define ipv6_sk_rxinfo(sk) 0 312 313 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 314 { 315 return NULL; 316 } 317 318 static inline struct inet6_request_sock * 319 inet6_rsk(const struct request_sock *rsk) 320 { 321 return NULL; 322 } 323 324 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 325 { 326 return NULL; 327 } 328 329 #define inet6_rcv_saddr(__sk) NULL 330 #define tcp_twsk_ipv6only(__sk) 0 331 #define inet_v6_ipv6only(__sk) 0 332 #endif /* IS_ENABLED(CONFIG_IPV6) */ 333 #endif /* _IPV6_H */ 334