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_min_plen; 41 __s32 accept_ra_rt_info_max_plen; 42 #endif 43 #endif 44 __s32 proxy_ndp; 45 __s32 accept_source_route; 46 __s32 accept_ra_from_local; 47 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 48 __s32 optimistic_dad; 49 __s32 use_optimistic; 50 #endif 51 #ifdef CONFIG_IPV6_MROUTE 52 __s32 mc_forwarding; 53 #endif 54 __s32 disable_ipv6; 55 __s32 drop_unicast_in_l2_multicast; 56 __s32 accept_dad; 57 __s32 force_tllao; 58 __s32 ndisc_notify; 59 __s32 suppress_frag_ndisc; 60 __s32 accept_ra_mtu; 61 __s32 drop_unsolicited_na; 62 struct ipv6_stable_secret { 63 bool initialized; 64 struct in6_addr secret; 65 } stable_secret; 66 __s32 use_oif_addrs_only; 67 __s32 keep_addr_on_down; 68 __s32 seg6_enabled; 69 #ifdef CONFIG_IPV6_SEG6_HMAC 70 __s32 seg6_require_hmac; 71 #endif 72 __u32 enhanced_dad; 73 __u32 addr_gen_mode; 74 __s32 disable_policy; 75 76 struct ctl_table_header *sysctl_header; 77 }; 78 79 struct ipv6_params { 80 __s32 disable_ipv6; 81 __s32 autoconf; 82 }; 83 extern struct ipv6_params ipv6_defaults; 84 #include <linux/icmpv6.h> 85 #include <linux/tcp.h> 86 #include <linux/udp.h> 87 88 #include <net/inet_sock.h> 89 90 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 91 { 92 return (struct ipv6hdr *)skb_network_header(skb); 93 } 94 95 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 96 { 97 return (struct ipv6hdr *)skb_inner_network_header(skb); 98 } 99 100 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 101 { 102 return (struct ipv6hdr *)skb_transport_header(skb); 103 } 104 105 /* 106 This structure contains results of exthdrs parsing 107 as offsets from skb->nh. 108 */ 109 110 struct inet6_skb_parm { 111 int iif; 112 __be16 ra; 113 __u16 dst0; 114 __u16 srcrt; 115 __u16 dst1; 116 __u16 lastopt; 117 __u16 nhoff; 118 __u16 flags; 119 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 120 __u16 dsthao; 121 #endif 122 __u16 frag_max_size; 123 124 #define IP6SKB_XFRM_TRANSFORMED 1 125 #define IP6SKB_FORWARDED 2 126 #define IP6SKB_REROUTED 4 127 #define IP6SKB_ROUTERALERT 8 128 #define IP6SKB_FRAGMENTED 16 129 #define IP6SKB_HOPBYHOP 32 130 #define IP6SKB_L3SLAVE 64 131 }; 132 133 #if defined(CONFIG_NET_L3_MASTER_DEV) 134 static inline bool ipv6_l3mdev_skb(__u16 flags) 135 { 136 return flags & IP6SKB_L3SLAVE; 137 } 138 #else 139 static inline bool ipv6_l3mdev_skb(__u16 flags) 140 { 141 return false; 142 } 143 #endif 144 145 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 146 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 147 148 static inline int inet6_iif(const struct sk_buff *skb) 149 { 150 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 151 152 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 153 } 154 155 /* can not be used in TCP layer after tcp_v6_fill_cb */ 156 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb) 157 { 158 #if defined(CONFIG_NET_L3_MASTER_DEV) 159 if (!net->ipv4.sysctl_tcp_l3mdev_accept && 160 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 161 return true; 162 #endif 163 return false; 164 } 165 166 struct tcp6_request_sock { 167 struct tcp_request_sock tcp6rsk_tcp; 168 }; 169 170 struct ipv6_mc_socklist; 171 struct ipv6_ac_socklist; 172 struct ipv6_fl_socklist; 173 174 struct inet6_cork { 175 struct ipv6_txoptions *opt; 176 u8 hop_limit; 177 u8 tclass; 178 }; 179 180 /** 181 * struct ipv6_pinfo - ipv6 private area 182 * 183 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 184 * this _must_ be the last member, so that inet6_sk_generic 185 * is able to calculate its offset from the base struct sock 186 * by using the struct proto->slab_obj_size member. -acme 187 */ 188 struct ipv6_pinfo { 189 struct in6_addr saddr; 190 struct in6_pktinfo sticky_pktinfo; 191 const struct in6_addr *daddr_cache; 192 #ifdef CONFIG_IPV6_SUBTREES 193 const struct in6_addr *saddr_cache; 194 #endif 195 196 __be32 flow_label; 197 __u32 frag_size; 198 199 /* 200 * Packed in 16bits. 201 * Omit one shift by by putting the signed field at MSB. 202 */ 203 #if defined(__BIG_ENDIAN_BITFIELD) 204 __s16 hop_limit:9; 205 __u16 __unused_1:7; 206 #else 207 __u16 __unused_1:7; 208 __s16 hop_limit:9; 209 #endif 210 211 #if defined(__BIG_ENDIAN_BITFIELD) 212 /* Packed in 16bits. */ 213 __s16 mcast_hops:9; 214 __u16 __unused_2:6, 215 mc_loop:1; 216 #else 217 __u16 mc_loop:1, 218 __unused_2:6; 219 __s16 mcast_hops:9; 220 #endif 221 int ucast_oif; 222 int mcast_oif; 223 224 /* pktoption flags */ 225 union { 226 struct { 227 __u16 srcrt:1, 228 osrcrt:1, 229 rxinfo:1, 230 rxoinfo:1, 231 rxhlim:1, 232 rxohlim:1, 233 hopopts:1, 234 ohopopts:1, 235 dstopts:1, 236 odstopts:1, 237 rxflow:1, 238 rxtclass:1, 239 rxpmtu:1, 240 rxorigdstaddr:1, 241 recvfragsize:1; 242 /* 1 bits hole */ 243 } bits; 244 __u16 all; 245 } rxopt; 246 247 /* sockopt flags */ 248 __u16 recverr:1, 249 sndflow:1, 250 repflow:1, 251 pmtudisc:3, 252 padding:1, /* 1 bit hole */ 253 srcprefs:3, /* 001: prefer temporary address 254 * 010: prefer public address 255 * 100: prefer care-of address 256 */ 257 dontfrag:1, 258 autoflowlabel:1; 259 __u8 min_hopcount; 260 __u8 tclass; 261 __be32 rcv_flowinfo; 262 263 __u32 dst_cookie; 264 __u32 rx_dst_cookie; 265 266 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 267 struct ipv6_ac_socklist *ipv6_ac_list; 268 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 269 270 struct ipv6_txoptions __rcu *opt; 271 struct sk_buff *pktoptions; 272 struct sk_buff *rxpmtu; 273 struct inet6_cork cork; 274 }; 275 276 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 277 struct raw6_sock { 278 /* inet_sock has to be the first member of raw6_sock */ 279 struct inet_sock inet; 280 __u32 checksum; /* perform checksum */ 281 __u32 offset; /* checksum offset */ 282 struct icmp6_filter filter; 283 __u32 ip6mr_table; 284 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 285 struct ipv6_pinfo inet6; 286 }; 287 288 struct udp6_sock { 289 struct udp_sock udp; 290 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 291 struct ipv6_pinfo inet6; 292 }; 293 294 struct tcp6_sock { 295 struct tcp_sock tcp; 296 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 297 struct ipv6_pinfo inet6; 298 }; 299 300 extern int inet6_sk_rebuild_header(struct sock *sk); 301 302 struct tcp6_timewait_sock { 303 struct tcp_timewait_sock tcp6tw_tcp; 304 }; 305 306 #if IS_ENABLED(CONFIG_IPV6) 307 bool ipv6_mod_enabled(void); 308 309 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 310 { 311 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 312 } 313 314 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 315 { 316 return (struct raw6_sock *)sk; 317 } 318 319 static inline void inet_sk_copy_descendant(struct sock *sk_to, 320 const struct sock *sk_from) 321 { 322 int ancestor_size = sizeof(struct inet_sock); 323 324 if (sk_from->sk_family == PF_INET6) 325 ancestor_size += sizeof(struct ipv6_pinfo); 326 327 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 328 } 329 330 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 331 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 332 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 333 inet6_sk(sk)->rxopt.bits.rxinfo) 334 335 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 336 { 337 if (sk->sk_family == AF_INET6) 338 return &sk->sk_v6_rcv_saddr; 339 return NULL; 340 } 341 342 static inline int inet_v6_ipv6only(const struct sock *sk) 343 { 344 /* ipv6only field is at same position for timewait and other sockets */ 345 return ipv6_only_sock(sk); 346 } 347 #else 348 #define __ipv6_only_sock(sk) 0 349 #define ipv6_only_sock(sk) 0 350 #define ipv6_sk_rxinfo(sk) 0 351 352 static inline bool ipv6_mod_enabled(void) 353 { 354 return false; 355 } 356 357 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 358 { 359 return NULL; 360 } 361 362 static inline struct inet6_request_sock * 363 inet6_rsk(const struct request_sock *rsk) 364 { 365 return NULL; 366 } 367 368 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 369 { 370 return NULL; 371 } 372 373 #define inet6_rcv_saddr(__sk) NULL 374 #define tcp_twsk_ipv6only(__sk) 0 375 #define inet_v6_ipv6only(__sk) 0 376 #endif /* IS_ENABLED(CONFIG_IPV6) */ 377 #endif /* _IPV6_H */ 378