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