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