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 #define IP6SKB_L3SLAVE 64 122 }; 123 124 #if defined(CONFIG_NET_L3_MASTER_DEV) 125 static inline bool skb_l3mdev_slave(__u16 flags) 126 { 127 return flags & IP6SKB_L3SLAVE; 128 } 129 #else 130 static inline bool skb_l3mdev_slave(__u16 flags) 131 { 132 return false; 133 } 134 #endif 135 136 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 137 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 138 139 static inline int inet6_iif(const struct sk_buff *skb) 140 { 141 bool l3_slave = skb_l3mdev_slave(IP6CB(skb)->flags); 142 143 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 144 } 145 146 struct tcp6_request_sock { 147 struct tcp_request_sock tcp6rsk_tcp; 148 }; 149 150 struct ipv6_mc_socklist; 151 struct ipv6_ac_socklist; 152 struct ipv6_fl_socklist; 153 154 struct inet6_cork { 155 struct ipv6_txoptions *opt; 156 u8 hop_limit; 157 u8 tclass; 158 }; 159 160 /** 161 * struct ipv6_pinfo - ipv6 private area 162 * 163 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 164 * this _must_ be the last member, so that inet6_sk_generic 165 * is able to calculate its offset from the base struct sock 166 * by using the struct proto->slab_obj_size member. -acme 167 */ 168 struct ipv6_pinfo { 169 struct in6_addr saddr; 170 struct in6_pktinfo sticky_pktinfo; 171 const struct in6_addr *daddr_cache; 172 #ifdef CONFIG_IPV6_SUBTREES 173 const struct in6_addr *saddr_cache; 174 #endif 175 176 __be32 flow_label; 177 __u32 frag_size; 178 179 /* 180 * Packed in 16bits. 181 * Omit one shift by by putting the signed field at MSB. 182 */ 183 #if defined(__BIG_ENDIAN_BITFIELD) 184 __s16 hop_limit:9; 185 __u16 __unused_1:7; 186 #else 187 __u16 __unused_1:7; 188 __s16 hop_limit:9; 189 #endif 190 191 #if defined(__BIG_ENDIAN_BITFIELD) 192 /* Packed in 16bits. */ 193 __s16 mcast_hops:9; 194 __u16 __unused_2:6, 195 mc_loop:1; 196 #else 197 __u16 mc_loop:1, 198 __unused_2:6; 199 __s16 mcast_hops:9; 200 #endif 201 int ucast_oif; 202 int mcast_oif; 203 204 /* pktoption flags */ 205 union { 206 struct { 207 __u16 srcrt:1, 208 osrcrt:1, 209 rxinfo:1, 210 rxoinfo:1, 211 rxhlim:1, 212 rxohlim:1, 213 hopopts:1, 214 ohopopts:1, 215 dstopts:1, 216 odstopts:1, 217 rxflow:1, 218 rxtclass:1, 219 rxpmtu:1, 220 rxorigdstaddr:1; 221 /* 2 bits hole */ 222 } bits; 223 __u16 all; 224 } rxopt; 225 226 /* sockopt flags */ 227 __u16 recverr:1, 228 sndflow:1, 229 repflow:1, 230 pmtudisc:3, 231 padding:1, /* 1 bit hole */ 232 srcprefs:3, /* 001: prefer temporary address 233 * 010: prefer public address 234 * 100: prefer care-of address 235 */ 236 dontfrag:1, 237 autoflowlabel:1; 238 __u8 min_hopcount; 239 __u8 tclass; 240 __be32 rcv_flowinfo; 241 242 __u32 dst_cookie; 243 __u32 rx_dst_cookie; 244 245 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 246 struct ipv6_ac_socklist *ipv6_ac_list; 247 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 248 249 struct ipv6_txoptions __rcu *opt; 250 struct sk_buff *pktoptions; 251 struct sk_buff *rxpmtu; 252 struct inet6_cork cork; 253 }; 254 255 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 256 struct raw6_sock { 257 /* inet_sock has to be the first member of raw6_sock */ 258 struct inet_sock inet; 259 __u32 checksum; /* perform checksum */ 260 __u32 offset; /* checksum offset */ 261 struct icmp6_filter filter; 262 __u32 ip6mr_table; 263 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 264 struct ipv6_pinfo inet6; 265 }; 266 267 struct udp6_sock { 268 struct udp_sock udp; 269 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 270 struct ipv6_pinfo inet6; 271 }; 272 273 struct tcp6_sock { 274 struct tcp_sock tcp; 275 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 276 struct ipv6_pinfo inet6; 277 }; 278 279 extern int inet6_sk_rebuild_header(struct sock *sk); 280 281 struct tcp6_timewait_sock { 282 struct tcp_timewait_sock tcp6tw_tcp; 283 }; 284 285 #if IS_ENABLED(CONFIG_IPV6) 286 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 287 { 288 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 289 } 290 291 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 292 { 293 return (struct raw6_sock *)sk; 294 } 295 296 static inline void inet_sk_copy_descendant(struct sock *sk_to, 297 const struct sock *sk_from) 298 { 299 int ancestor_size = sizeof(struct inet_sock); 300 301 if (sk_from->sk_family == PF_INET6) 302 ancestor_size += sizeof(struct ipv6_pinfo); 303 304 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 305 } 306 307 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 308 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 309 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 310 inet6_sk(sk)->rxopt.bits.rxinfo) 311 312 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 313 { 314 if (sk->sk_family == AF_INET6) 315 return &sk->sk_v6_rcv_saddr; 316 return NULL; 317 } 318 319 static inline int inet_v6_ipv6only(const struct sock *sk) 320 { 321 /* ipv6only field is at same position for timewait and other sockets */ 322 return ipv6_only_sock(sk); 323 } 324 #else 325 #define __ipv6_only_sock(sk) 0 326 #define ipv6_only_sock(sk) 0 327 #define ipv6_sk_rxinfo(sk) 0 328 329 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 330 { 331 return NULL; 332 } 333 334 static inline struct inet6_request_sock * 335 inet6_rsk(const struct request_sock *rsk) 336 { 337 return NULL; 338 } 339 340 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 341 { 342 return NULL; 343 } 344 345 #define inet6_rcv_saddr(__sk) NULL 346 #define tcp_twsk_ipv6only(__sk) 0 347 #define inet_v6_ipv6only(__sk) 0 348 #endif /* IS_ENABLED(CONFIG_IPV6) */ 349 #endif /* _IPV6_H */ 350