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 67 struct ctl_table_header *sysctl_header; 68 }; 69 70 struct ipv6_params { 71 __s32 disable_ipv6; 72 __s32 autoconf; 73 }; 74 extern struct ipv6_params ipv6_defaults; 75 #include <linux/icmpv6.h> 76 #include <linux/tcp.h> 77 #include <linux/udp.h> 78 79 #include <net/inet_sock.h> 80 81 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 82 { 83 return (struct ipv6hdr *)skb_network_header(skb); 84 } 85 86 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 87 { 88 return (struct ipv6hdr *)skb_inner_network_header(skb); 89 } 90 91 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 92 { 93 return (struct ipv6hdr *)skb_transport_header(skb); 94 } 95 96 /* 97 This structure contains results of exthdrs parsing 98 as offsets from skb->nh. 99 */ 100 101 struct inet6_skb_parm { 102 int iif; 103 __be16 ra; 104 __u16 dst0; 105 __u16 srcrt; 106 __u16 dst1; 107 __u16 lastopt; 108 __u16 nhoff; 109 __u16 flags; 110 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 111 __u16 dsthao; 112 #endif 113 __u16 frag_max_size; 114 115 #define IP6SKB_XFRM_TRANSFORMED 1 116 #define IP6SKB_FORWARDED 2 117 #define IP6SKB_REROUTED 4 118 #define IP6SKB_ROUTERALERT 8 119 #define IP6SKB_FRAGMENTED 16 120 #define IP6SKB_HOPBYHOP 32 121 }; 122 123 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 124 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 125 126 static inline int inet6_iif(const struct sk_buff *skb) 127 { 128 return IP6CB(skb)->iif; 129 } 130 131 struct tcp6_request_sock { 132 struct tcp_request_sock tcp6rsk_tcp; 133 }; 134 135 struct ipv6_mc_socklist; 136 struct ipv6_ac_socklist; 137 struct ipv6_fl_socklist; 138 139 struct inet6_cork { 140 struct ipv6_txoptions *opt; 141 u8 hop_limit; 142 u8 tclass; 143 }; 144 145 /** 146 * struct ipv6_pinfo - ipv6 private area 147 * 148 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 149 * this _must_ be the last member, so that inet6_sk_generic 150 * is able to calculate its offset from the base struct sock 151 * by using the struct proto->slab_obj_size member. -acme 152 */ 153 struct ipv6_pinfo { 154 struct in6_addr saddr; 155 struct in6_pktinfo sticky_pktinfo; 156 const struct in6_addr *daddr_cache; 157 #ifdef CONFIG_IPV6_SUBTREES 158 const struct in6_addr *saddr_cache; 159 #endif 160 161 __be32 flow_label; 162 __u32 frag_size; 163 164 /* 165 * Packed in 16bits. 166 * Omit one shift by by putting the signed field at MSB. 167 */ 168 #if defined(__BIG_ENDIAN_BITFIELD) 169 __s16 hop_limit:9; 170 __u16 __unused_1:7; 171 #else 172 __u16 __unused_1:7; 173 __s16 hop_limit:9; 174 #endif 175 176 #if defined(__BIG_ENDIAN_BITFIELD) 177 /* Packed in 16bits. */ 178 __s16 mcast_hops:9; 179 __u16 __unused_2:6, 180 mc_loop:1; 181 #else 182 __u16 mc_loop:1, 183 __unused_2:6; 184 __s16 mcast_hops:9; 185 #endif 186 int ucast_oif; 187 int mcast_oif; 188 189 /* pktoption flags */ 190 union { 191 struct { 192 __u16 srcrt:1, 193 osrcrt:1, 194 rxinfo:1, 195 rxoinfo:1, 196 rxhlim:1, 197 rxohlim:1, 198 hopopts:1, 199 ohopopts:1, 200 dstopts:1, 201 odstopts:1, 202 rxflow:1, 203 rxtclass:1, 204 rxpmtu:1, 205 rxorigdstaddr:1; 206 /* 2 bits hole */ 207 } bits; 208 __u16 all; 209 } rxopt; 210 211 /* sockopt flags */ 212 __u16 recverr:1, 213 sndflow:1, 214 repflow:1, 215 pmtudisc:3, 216 padding:1, /* 1 bit hole */ 217 srcprefs:3, /* 001: prefer temporary address 218 * 010: prefer public address 219 * 100: prefer care-of address 220 */ 221 dontfrag:1, 222 autoflowlabel:1; 223 __u8 min_hopcount; 224 __u8 tclass; 225 __be32 rcv_flowinfo; 226 227 __u32 dst_cookie; 228 __u32 rx_dst_cookie; 229 230 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 231 struct ipv6_ac_socklist *ipv6_ac_list; 232 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 233 234 struct ipv6_txoptions __rcu *opt; 235 struct sk_buff *pktoptions; 236 struct sk_buff *rxpmtu; 237 struct inet6_cork cork; 238 }; 239 240 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 241 struct raw6_sock { 242 /* inet_sock has to be the first member of raw6_sock */ 243 struct inet_sock inet; 244 __u32 checksum; /* perform checksum */ 245 __u32 offset; /* checksum offset */ 246 struct icmp6_filter filter; 247 __u32 ip6mr_table; 248 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 249 struct ipv6_pinfo inet6; 250 }; 251 252 struct udp6_sock { 253 struct udp_sock udp; 254 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 255 struct ipv6_pinfo inet6; 256 }; 257 258 struct tcp6_sock { 259 struct tcp_sock tcp; 260 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 261 struct ipv6_pinfo inet6; 262 }; 263 264 extern int inet6_sk_rebuild_header(struct sock *sk); 265 266 struct tcp6_timewait_sock { 267 struct tcp_timewait_sock tcp6tw_tcp; 268 }; 269 270 #if IS_ENABLED(CONFIG_IPV6) 271 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 272 { 273 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 274 } 275 276 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 277 { 278 return (struct raw6_sock *)sk; 279 } 280 281 static inline void inet_sk_copy_descendant(struct sock *sk_to, 282 const struct sock *sk_from) 283 { 284 int ancestor_size = sizeof(struct inet_sock); 285 286 if (sk_from->sk_family == PF_INET6) 287 ancestor_size += sizeof(struct ipv6_pinfo); 288 289 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 290 } 291 292 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 293 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 294 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 295 inet6_sk(sk)->rxopt.bits.rxinfo) 296 297 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 298 { 299 if (sk->sk_family == AF_INET6) 300 return &sk->sk_v6_rcv_saddr; 301 return NULL; 302 } 303 304 static inline int inet_v6_ipv6only(const struct sock *sk) 305 { 306 /* ipv6only field is at same position for timewait and other sockets */ 307 return ipv6_only_sock(sk); 308 } 309 #else 310 #define __ipv6_only_sock(sk) 0 311 #define ipv6_only_sock(sk) 0 312 #define ipv6_sk_rxinfo(sk) 0 313 314 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 315 { 316 return NULL; 317 } 318 319 static inline struct inet6_request_sock * 320 inet6_rsk(const struct request_sock *rsk) 321 { 322 return NULL; 323 } 324 325 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 326 { 327 return NULL; 328 } 329 330 #define inet6_rcv_saddr(__sk) NULL 331 #define tcp_twsk_ipv6only(__sk) 0 332 #define inet_v6_ipv6only(__sk) 0 333 #endif /* IS_ENABLED(CONFIG_IPV6) */ 334 #endif /* _IPV6_H */ 335