1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _IPV6_H 3 #define _IPV6_H 4 5 #include <uapi/linux/ipv6.h> 6 7 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3) 8 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2) 9 /* 10 * This structure contains configuration options per IPv6 link. 11 */ 12 struct ipv6_devconf { 13 __s32 forwarding; 14 __s32 hop_limit; 15 __s32 mtu6; 16 __s32 accept_ra; 17 __s32 accept_redirects; 18 __s32 autoconf; 19 __s32 dad_transmits; 20 __s32 rtr_solicits; 21 __s32 rtr_solicit_interval; 22 __s32 rtr_solicit_max_interval; 23 __s32 rtr_solicit_delay; 24 __s32 force_mld_version; 25 __s32 mldv1_unsolicited_report_interval; 26 __s32 mldv2_unsolicited_report_interval; 27 __s32 use_tempaddr; 28 __s32 temp_valid_lft; 29 __s32 temp_prefered_lft; 30 __s32 regen_max_retry; 31 __s32 max_desync_factor; 32 __s32 max_addresses; 33 __s32 accept_ra_defrtr; 34 __s32 accept_ra_min_hop_limit; 35 __s32 accept_ra_pinfo; 36 __s32 ignore_routes_with_linkdown; 37 #ifdef CONFIG_IPV6_ROUTER_PREF 38 __s32 accept_ra_rtr_pref; 39 __s32 rtr_probe_interval; 40 #ifdef CONFIG_IPV6_ROUTE_INFO 41 __s32 accept_ra_rt_info_min_plen; 42 __s32 accept_ra_rt_info_max_plen; 43 #endif 44 #endif 45 __s32 proxy_ndp; 46 __s32 accept_source_route; 47 __s32 accept_ra_from_local; 48 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 49 __s32 optimistic_dad; 50 __s32 use_optimistic; 51 #endif 52 #ifdef CONFIG_IPV6_MROUTE 53 __s32 mc_forwarding; 54 #endif 55 __s32 disable_ipv6; 56 __s32 drop_unicast_in_l2_multicast; 57 __s32 accept_dad; 58 __s32 force_tllao; 59 __s32 ndisc_notify; 60 __s32 suppress_frag_ndisc; 61 __s32 accept_ra_mtu; 62 __s32 drop_unsolicited_na; 63 struct ipv6_stable_secret { 64 bool initialized; 65 struct in6_addr secret; 66 } stable_secret; 67 __s32 use_oif_addrs_only; 68 __s32 keep_addr_on_down; 69 __s32 seg6_enabled; 70 #ifdef CONFIG_IPV6_SEG6_HMAC 71 __s32 seg6_require_hmac; 72 #endif 73 __u32 enhanced_dad; 74 __u32 addr_gen_mode; 75 __s32 disable_policy; 76 77 struct ctl_table_header *sysctl_header; 78 }; 79 80 struct ipv6_params { 81 __s32 disable_ipv6; 82 __s32 autoconf; 83 }; 84 extern struct ipv6_params ipv6_defaults; 85 #include <linux/icmpv6.h> 86 #include <linux/tcp.h> 87 #include <linux/udp.h> 88 89 #include <net/inet_sock.h> 90 91 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 92 { 93 return (struct ipv6hdr *)skb_network_header(skb); 94 } 95 96 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 97 { 98 return (struct ipv6hdr *)skb_inner_network_header(skb); 99 } 100 101 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 102 { 103 return (struct ipv6hdr *)skb_transport_header(skb); 104 } 105 106 /* 107 This structure contains results of exthdrs parsing 108 as offsets from skb->nh. 109 */ 110 111 struct inet6_skb_parm { 112 int iif; 113 __be16 ra; 114 __u16 dst0; 115 __u16 srcrt; 116 __u16 dst1; 117 __u16 lastopt; 118 __u16 nhoff; 119 __u16 flags; 120 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 121 __u16 dsthao; 122 #endif 123 __u16 frag_max_size; 124 125 #define IP6SKB_XFRM_TRANSFORMED 1 126 #define IP6SKB_FORWARDED 2 127 #define IP6SKB_REROUTED 4 128 #define IP6SKB_ROUTERALERT 8 129 #define IP6SKB_FRAGMENTED 16 130 #define IP6SKB_HOPBYHOP 32 131 #define IP6SKB_L3SLAVE 64 132 #define IP6SKB_JUMBOGRAM 128 133 }; 134 135 #if defined(CONFIG_NET_L3_MASTER_DEV) 136 static inline bool ipv6_l3mdev_skb(__u16 flags) 137 { 138 return flags & IP6SKB_L3SLAVE; 139 } 140 #else 141 static inline bool ipv6_l3mdev_skb(__u16 flags) 142 { 143 return false; 144 } 145 #endif 146 147 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 148 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 149 150 static inline int inet6_iif(const struct sk_buff *skb) 151 { 152 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 153 154 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 155 } 156 157 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 158 { 159 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 160 } 161 162 /* can not be used in TCP layer after tcp_v6_fill_cb */ 163 static inline int inet6_sdif(const struct sk_buff *skb) 164 { 165 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 166 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 167 return IP6CB(skb)->iif; 168 #endif 169 return 0; 170 } 171 172 /* can not be used in TCP layer after tcp_v6_fill_cb */ 173 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb) 174 { 175 #if defined(CONFIG_NET_L3_MASTER_DEV) 176 if (!net->ipv4.sysctl_tcp_l3mdev_accept && 177 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 178 return true; 179 #endif 180 return false; 181 } 182 183 struct tcp6_request_sock { 184 struct tcp_request_sock tcp6rsk_tcp; 185 }; 186 187 struct ipv6_mc_socklist; 188 struct ipv6_ac_socklist; 189 struct ipv6_fl_socklist; 190 191 struct inet6_cork { 192 struct ipv6_txoptions *opt; 193 u8 hop_limit; 194 u8 tclass; 195 }; 196 197 /** 198 * struct ipv6_pinfo - ipv6 private area 199 * 200 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 201 * this _must_ be the last member, so that inet6_sk_generic 202 * is able to calculate its offset from the base struct sock 203 * by using the struct proto->slab_obj_size member. -acme 204 */ 205 struct ipv6_pinfo { 206 struct in6_addr saddr; 207 struct in6_pktinfo sticky_pktinfo; 208 const struct in6_addr *daddr_cache; 209 #ifdef CONFIG_IPV6_SUBTREES 210 const struct in6_addr *saddr_cache; 211 #endif 212 213 __be32 flow_label; 214 __u32 frag_size; 215 216 /* 217 * Packed in 16bits. 218 * Omit one shift by by putting the signed field at MSB. 219 */ 220 #if defined(__BIG_ENDIAN_BITFIELD) 221 __s16 hop_limit:9; 222 __u16 __unused_1:7; 223 #else 224 __u16 __unused_1:7; 225 __s16 hop_limit:9; 226 #endif 227 228 #if defined(__BIG_ENDIAN_BITFIELD) 229 /* Packed in 16bits. */ 230 __s16 mcast_hops:9; 231 __u16 __unused_2:6, 232 mc_loop:1; 233 #else 234 __u16 mc_loop:1, 235 __unused_2:6; 236 __s16 mcast_hops:9; 237 #endif 238 int ucast_oif; 239 int mcast_oif; 240 241 /* pktoption flags */ 242 union { 243 struct { 244 __u16 srcrt:1, 245 osrcrt:1, 246 rxinfo:1, 247 rxoinfo:1, 248 rxhlim:1, 249 rxohlim:1, 250 hopopts:1, 251 ohopopts:1, 252 dstopts:1, 253 odstopts:1, 254 rxflow:1, 255 rxtclass:1, 256 rxpmtu:1, 257 rxorigdstaddr:1, 258 recvfragsize:1; 259 /* 1 bits hole */ 260 } bits; 261 __u16 all; 262 } rxopt; 263 264 /* sockopt flags */ 265 __u16 recverr:1, 266 sndflow:1, 267 repflow:1, 268 pmtudisc:3, 269 padding:1, /* 1 bit hole */ 270 srcprefs:3, /* 001: prefer temporary address 271 * 010: prefer public address 272 * 100: prefer care-of address 273 */ 274 dontfrag:1, 275 autoflowlabel:1; 276 __u8 min_hopcount; 277 __u8 tclass; 278 __be32 rcv_flowinfo; 279 280 __u32 dst_cookie; 281 __u32 rx_dst_cookie; 282 283 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 284 struct ipv6_ac_socklist *ipv6_ac_list; 285 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 286 287 struct ipv6_txoptions __rcu *opt; 288 struct sk_buff *pktoptions; 289 struct sk_buff *rxpmtu; 290 struct inet6_cork cork; 291 }; 292 293 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 294 struct raw6_sock { 295 /* inet_sock has to be the first member of raw6_sock */ 296 struct inet_sock inet; 297 __u32 checksum; /* perform checksum */ 298 __u32 offset; /* checksum offset */ 299 struct icmp6_filter filter; 300 __u32 ip6mr_table; 301 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 302 struct ipv6_pinfo inet6; 303 }; 304 305 struct udp6_sock { 306 struct udp_sock udp; 307 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 308 struct ipv6_pinfo inet6; 309 }; 310 311 struct tcp6_sock { 312 struct tcp_sock tcp; 313 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 314 struct ipv6_pinfo inet6; 315 }; 316 317 extern int inet6_sk_rebuild_header(struct sock *sk); 318 319 struct tcp6_timewait_sock { 320 struct tcp_timewait_sock tcp6tw_tcp; 321 }; 322 323 #if IS_ENABLED(CONFIG_IPV6) 324 bool ipv6_mod_enabled(void); 325 326 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 327 { 328 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 329 } 330 331 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 332 { 333 return (struct raw6_sock *)sk; 334 } 335 336 static inline void inet_sk_copy_descendant(struct sock *sk_to, 337 const struct sock *sk_from) 338 { 339 int ancestor_size = sizeof(struct inet_sock); 340 341 if (sk_from->sk_family == PF_INET6) 342 ancestor_size += sizeof(struct ipv6_pinfo); 343 344 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 345 } 346 347 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 348 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 349 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 350 inet6_sk(sk)->rxopt.bits.rxinfo) 351 352 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 353 { 354 if (sk->sk_family == AF_INET6) 355 return &sk->sk_v6_rcv_saddr; 356 return NULL; 357 } 358 359 static inline int inet_v6_ipv6only(const struct sock *sk) 360 { 361 /* ipv6only field is at same position for timewait and other sockets */ 362 return ipv6_only_sock(sk); 363 } 364 #else 365 #define __ipv6_only_sock(sk) 0 366 #define ipv6_only_sock(sk) 0 367 #define ipv6_sk_rxinfo(sk) 0 368 369 static inline bool ipv6_mod_enabled(void) 370 { 371 return false; 372 } 373 374 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 375 { 376 return NULL; 377 } 378 379 static inline struct inet6_request_sock * 380 inet6_rsk(const struct request_sock *rsk) 381 { 382 return NULL; 383 } 384 385 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 386 { 387 return NULL; 388 } 389 390 #define inet6_rcv_saddr(__sk) NULL 391 #define tcp_twsk_ipv6only(__sk) 0 392 #define inet_v6_ipv6only(__sk) 0 393 #endif /* IS_ENABLED(CONFIG_IPV6) */ 394 #endif /* _IPV6_H */ 395