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