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