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_max_interval; 22 __s32 rtr_solicit_delay; 23 __s32 force_mld_version; 24 __s32 mldv1_unsolicited_report_interval; 25 __s32 mldv2_unsolicited_report_interval; 26 __s32 use_tempaddr; 27 __s32 temp_valid_lft; 28 __s32 temp_prefered_lft; 29 __s32 regen_max_retry; 30 __s32 max_desync_factor; 31 __s32 max_addresses; 32 __s32 accept_ra_defrtr; 33 __s32 accept_ra_min_hop_limit; 34 __s32 accept_ra_pinfo; 35 __s32 ignore_routes_with_linkdown; 36 #ifdef CONFIG_IPV6_ROUTER_PREF 37 __s32 accept_ra_rtr_pref; 38 __s32 rtr_probe_interval; 39 #ifdef CONFIG_IPV6_ROUTE_INFO 40 __s32 accept_ra_rt_info_max_plen; 41 #endif 42 #endif 43 __s32 proxy_ndp; 44 __s32 accept_source_route; 45 __s32 accept_ra_from_local; 46 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 47 __s32 optimistic_dad; 48 __s32 use_optimistic; 49 #endif 50 #ifdef CONFIG_IPV6_MROUTE 51 __s32 mc_forwarding; 52 #endif 53 __s32 disable_ipv6; 54 __s32 drop_unicast_in_l2_multicast; 55 __s32 accept_dad; 56 __s32 force_tllao; 57 __s32 ndisc_notify; 58 __s32 suppress_frag_ndisc; 59 __s32 accept_ra_mtu; 60 __s32 drop_unsolicited_na; 61 struct ipv6_stable_secret { 62 bool initialized; 63 struct in6_addr secret; 64 } stable_secret; 65 __s32 use_oif_addrs_only; 66 __s32 keep_addr_on_down; 67 68 struct ctl_table_header *sysctl_header; 69 }; 70 71 struct ipv6_params { 72 __s32 disable_ipv6; 73 __s32 autoconf; 74 }; 75 extern struct ipv6_params ipv6_defaults; 76 #include <linux/icmpv6.h> 77 #include <linux/tcp.h> 78 #include <linux/udp.h> 79 80 #include <net/inet_sock.h> 81 82 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 83 { 84 return (struct ipv6hdr *)skb_network_header(skb); 85 } 86 87 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 88 { 89 return (struct ipv6hdr *)skb_inner_network_header(skb); 90 } 91 92 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 93 { 94 return (struct ipv6hdr *)skb_transport_header(skb); 95 } 96 97 /* 98 This structure contains results of exthdrs parsing 99 as offsets from skb->nh. 100 */ 101 102 struct inet6_skb_parm { 103 int iif; 104 __be16 ra; 105 __u16 dst0; 106 __u16 srcrt; 107 __u16 dst1; 108 __u16 lastopt; 109 __u16 nhoff; 110 __u16 flags; 111 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 112 __u16 dsthao; 113 #endif 114 __u16 frag_max_size; 115 116 #define IP6SKB_XFRM_TRANSFORMED 1 117 #define IP6SKB_FORWARDED 2 118 #define IP6SKB_REROUTED 4 119 #define IP6SKB_ROUTERALERT 8 120 #define IP6SKB_FRAGMENTED 16 121 #define IP6SKB_HOPBYHOP 32 122 #define IP6SKB_L3SLAVE 64 123 }; 124 125 #if defined(CONFIG_NET_L3_MASTER_DEV) 126 static inline bool ipv6_l3mdev_skb(__u16 flags) 127 { 128 return flags & IP6SKB_L3SLAVE; 129 } 130 #else 131 static inline bool ipv6_l3mdev_skb(__u16 flags) 132 { 133 return false; 134 } 135 #endif 136 137 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 138 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 139 140 static inline int inet6_iif(const struct sk_buff *skb) 141 { 142 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 143 144 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 145 } 146 147 /* can not be used in TCP layer after tcp_v6_fill_cb */ 148 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb) 149 { 150 #if defined(CONFIG_NET_L3_MASTER_DEV) 151 if (!net->ipv4.sysctl_tcp_l3mdev_accept && 152 ipv6_l3mdev_skb(IP6CB(skb)->flags)) 153 return true; 154 #endif 155 return false; 156 } 157 158 struct tcp6_request_sock { 159 struct tcp_request_sock tcp6rsk_tcp; 160 }; 161 162 struct ipv6_mc_socklist; 163 struct ipv6_ac_socklist; 164 struct ipv6_fl_socklist; 165 166 struct inet6_cork { 167 struct ipv6_txoptions *opt; 168 u8 hop_limit; 169 u8 tclass; 170 }; 171 172 /** 173 * struct ipv6_pinfo - ipv6 private area 174 * 175 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 176 * this _must_ be the last member, so that inet6_sk_generic 177 * is able to calculate its offset from the base struct sock 178 * by using the struct proto->slab_obj_size member. -acme 179 */ 180 struct ipv6_pinfo { 181 struct in6_addr saddr; 182 struct in6_pktinfo sticky_pktinfo; 183 const struct in6_addr *daddr_cache; 184 #ifdef CONFIG_IPV6_SUBTREES 185 const struct in6_addr *saddr_cache; 186 #endif 187 188 __be32 flow_label; 189 __u32 frag_size; 190 191 /* 192 * Packed in 16bits. 193 * Omit one shift by by putting the signed field at MSB. 194 */ 195 #if defined(__BIG_ENDIAN_BITFIELD) 196 __s16 hop_limit:9; 197 __u16 __unused_1:7; 198 #else 199 __u16 __unused_1:7; 200 __s16 hop_limit:9; 201 #endif 202 203 #if defined(__BIG_ENDIAN_BITFIELD) 204 /* Packed in 16bits. */ 205 __s16 mcast_hops:9; 206 __u16 __unused_2:6, 207 mc_loop:1; 208 #else 209 __u16 mc_loop:1, 210 __unused_2:6; 211 __s16 mcast_hops:9; 212 #endif 213 int ucast_oif; 214 int mcast_oif; 215 216 /* pktoption flags */ 217 union { 218 struct { 219 __u16 srcrt:1, 220 osrcrt:1, 221 rxinfo:1, 222 rxoinfo:1, 223 rxhlim:1, 224 rxohlim:1, 225 hopopts:1, 226 ohopopts:1, 227 dstopts:1, 228 odstopts:1, 229 rxflow:1, 230 rxtclass:1, 231 rxpmtu:1, 232 rxorigdstaddr:1; 233 /* 2 bits hole */ 234 } bits; 235 __u16 all; 236 } rxopt; 237 238 /* sockopt flags */ 239 __u16 recverr:1, 240 sndflow:1, 241 repflow:1, 242 pmtudisc:3, 243 padding:1, /* 1 bit hole */ 244 srcprefs:3, /* 001: prefer temporary address 245 * 010: prefer public address 246 * 100: prefer care-of address 247 */ 248 dontfrag:1, 249 autoflowlabel:1; 250 __u8 min_hopcount; 251 __u8 tclass; 252 __be32 rcv_flowinfo; 253 254 __u32 dst_cookie; 255 __u32 rx_dst_cookie; 256 257 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 258 struct ipv6_ac_socklist *ipv6_ac_list; 259 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 260 261 struct ipv6_txoptions __rcu *opt; 262 struct sk_buff *pktoptions; 263 struct sk_buff *rxpmtu; 264 struct inet6_cork cork; 265 }; 266 267 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 268 struct raw6_sock { 269 /* inet_sock has to be the first member of raw6_sock */ 270 struct inet_sock inet; 271 __u32 checksum; /* perform checksum */ 272 __u32 offset; /* checksum offset */ 273 struct icmp6_filter filter; 274 __u32 ip6mr_table; 275 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 276 struct ipv6_pinfo inet6; 277 }; 278 279 struct udp6_sock { 280 struct udp_sock udp; 281 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 282 struct ipv6_pinfo inet6; 283 }; 284 285 struct tcp6_sock { 286 struct tcp_sock tcp; 287 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 288 struct ipv6_pinfo inet6; 289 }; 290 291 extern int inet6_sk_rebuild_header(struct sock *sk); 292 293 struct tcp6_timewait_sock { 294 struct tcp_timewait_sock tcp6tw_tcp; 295 }; 296 297 #if IS_ENABLED(CONFIG_IPV6) 298 bool ipv6_mod_enabled(void); 299 300 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 301 { 302 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 303 } 304 305 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 306 { 307 return (struct raw6_sock *)sk; 308 } 309 310 static inline void inet_sk_copy_descendant(struct sock *sk_to, 311 const struct sock *sk_from) 312 { 313 int ancestor_size = sizeof(struct inet_sock); 314 315 if (sk_from->sk_family == PF_INET6) 316 ancestor_size += sizeof(struct ipv6_pinfo); 317 318 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 319 } 320 321 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 322 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 323 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 324 inet6_sk(sk)->rxopt.bits.rxinfo) 325 326 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 327 { 328 if (sk->sk_family == AF_INET6) 329 return &sk->sk_v6_rcv_saddr; 330 return NULL; 331 } 332 333 static inline int inet_v6_ipv6only(const struct sock *sk) 334 { 335 /* ipv6only field is at same position for timewait and other sockets */ 336 return ipv6_only_sock(sk); 337 } 338 #else 339 #define __ipv6_only_sock(sk) 0 340 #define ipv6_only_sock(sk) 0 341 #define ipv6_sk_rxinfo(sk) 0 342 343 static inline bool ipv6_mod_enabled(void) 344 { 345 return false; 346 } 347 348 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 349 { 350 return NULL; 351 } 352 353 static inline struct inet6_request_sock * 354 inet6_rsk(const struct request_sock *rsk) 355 { 356 return NULL; 357 } 358 359 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 360 { 361 return NULL; 362 } 363 364 #define inet6_rcv_saddr(__sk) NULL 365 #define tcp_twsk_ipv6only(__sk) 0 366 #define inet_v6_ipv6only(__sk) 0 367 #endif /* IS_ENABLED(CONFIG_IPV6) */ 368 #endif /* _IPV6_H */ 369