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