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 __s32 ndisc_tclass; 77 78 struct ctl_table_header *sysctl_header; 79 }; 80 81 struct ipv6_params { 82 __s32 disable_ipv6; 83 __s32 autoconf; 84 }; 85 extern struct ipv6_params ipv6_defaults; 86 #include <linux/icmpv6.h> 87 #include <linux/tcp.h> 88 #include <linux/udp.h> 89 90 #include <net/inet_sock.h> 91 92 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 93 { 94 return (struct ipv6hdr *)skb_network_header(skb); 95 } 96 97 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 98 { 99 return (struct ipv6hdr *)skb_inner_network_header(skb); 100 } 101 102 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 103 { 104 return (struct ipv6hdr *)skb_transport_header(skb); 105 } 106 107 /* 108 This structure contains results of exthdrs parsing 109 as offsets from skb->nh. 110 */ 111 112 struct inet6_skb_parm { 113 int iif; 114 __be16 ra; 115 __u16 dst0; 116 __u16 srcrt; 117 __u16 dst1; 118 __u16 lastopt; 119 __u16 nhoff; 120 __u16 flags; 121 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 122 __u16 dsthao; 123 #endif 124 __u16 frag_max_size; 125 126 #define IP6SKB_XFRM_TRANSFORMED 1 127 #define IP6SKB_FORWARDED 2 128 #define IP6SKB_REROUTED 4 129 #define IP6SKB_ROUTERALERT 8 130 #define IP6SKB_FRAGMENTED 16 131 #define IP6SKB_HOPBYHOP 32 132 #define IP6SKB_L3SLAVE 64 133 #define IP6SKB_JUMBOGRAM 128 134 }; 135 136 #if defined(CONFIG_NET_L3_MASTER_DEV) 137 static inline bool ipv6_l3mdev_skb(__u16 flags) 138 { 139 return flags & IP6SKB_L3SLAVE; 140 } 141 #else 142 static inline bool ipv6_l3mdev_skb(__u16 flags) 143 { 144 return false; 145 } 146 #endif 147 148 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 149 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 150 151 static inline int inet6_iif(const struct sk_buff *skb) 152 { 153 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 154 155 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 156 } 157 158 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 159 { 160 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 161 } 162 163 /* can not be used in TCP layer after tcp_v6_fill_cb */ 164 static inline int inet6_sdif(const struct sk_buff *skb) 165 { 166 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 167 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 168 return IP6CB(skb)->iif; 169 #endif 170 return 0; 171 } 172 173 /* can not be used in TCP layer after tcp_v6_fill_cb */ 174 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb) 175 { 176 #if defined(CONFIG_NET_L3_MASTER_DEV) 177 if (!net->ipv4.sysctl_tcp_l3mdev_accept && 178 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 179 return true; 180 #endif 181 return false; 182 } 183 184 struct tcp6_request_sock { 185 struct tcp_request_sock tcp6rsk_tcp; 186 }; 187 188 struct ipv6_mc_socklist; 189 struct ipv6_ac_socklist; 190 struct ipv6_fl_socklist; 191 192 struct inet6_cork { 193 struct ipv6_txoptions *opt; 194 u8 hop_limit; 195 u8 tclass; 196 }; 197 198 /** 199 * struct ipv6_pinfo - ipv6 private area 200 * 201 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 202 * this _must_ be the last member, so that inet6_sk_generic 203 * is able to calculate its offset from the base struct sock 204 * by using the struct proto->slab_obj_size member. -acme 205 */ 206 struct ipv6_pinfo { 207 struct in6_addr saddr; 208 struct in6_pktinfo sticky_pktinfo; 209 const struct in6_addr *daddr_cache; 210 #ifdef CONFIG_IPV6_SUBTREES 211 const struct in6_addr *saddr_cache; 212 #endif 213 214 __be32 flow_label; 215 __u32 frag_size; 216 217 /* 218 * Packed in 16bits. 219 * Omit one shift by by putting the signed field at MSB. 220 */ 221 #if defined(__BIG_ENDIAN_BITFIELD) 222 __s16 hop_limit:9; 223 __u16 __unused_1:7; 224 #else 225 __u16 __unused_1:7; 226 __s16 hop_limit:9; 227 #endif 228 229 #if defined(__BIG_ENDIAN_BITFIELD) 230 /* Packed in 16bits. */ 231 __s16 mcast_hops:9; 232 __u16 __unused_2:6, 233 mc_loop:1; 234 #else 235 __u16 mc_loop:1, 236 __unused_2:6; 237 __s16 mcast_hops:9; 238 #endif 239 int ucast_oif; 240 int mcast_oif; 241 242 /* pktoption flags */ 243 union { 244 struct { 245 __u16 srcrt:1, 246 osrcrt:1, 247 rxinfo:1, 248 rxoinfo:1, 249 rxhlim:1, 250 rxohlim:1, 251 hopopts:1, 252 ohopopts:1, 253 dstopts:1, 254 odstopts:1, 255 rxflow:1, 256 rxtclass:1, 257 rxpmtu:1, 258 rxorigdstaddr:1, 259 recvfragsize:1; 260 /* 1 bits hole */ 261 } bits; 262 __u16 all; 263 } rxopt; 264 265 /* sockopt flags */ 266 __u16 recverr:1, 267 sndflow:1, 268 repflow:1, 269 pmtudisc:3, 270 padding:1, /* 1 bit hole */ 271 srcprefs:3, /* 001: prefer temporary address 272 * 010: prefer public address 273 * 100: prefer care-of address 274 */ 275 dontfrag:1, 276 autoflowlabel:1, 277 autoflowlabel_set:1; 278 __u8 min_hopcount; 279 __u8 tclass; 280 __be32 rcv_flowinfo; 281 282 __u32 dst_cookie; 283 __u32 rx_dst_cookie; 284 285 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 286 struct ipv6_ac_socklist *ipv6_ac_list; 287 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 288 289 struct ipv6_txoptions __rcu *opt; 290 struct sk_buff *pktoptions; 291 struct sk_buff *rxpmtu; 292 struct inet6_cork cork; 293 }; 294 295 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 296 struct raw6_sock { 297 /* inet_sock has to be the first member of raw6_sock */ 298 struct inet_sock inet; 299 __u32 checksum; /* perform checksum */ 300 __u32 offset; /* checksum offset */ 301 struct icmp6_filter filter; 302 __u32 ip6mr_table; 303 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 304 struct ipv6_pinfo inet6; 305 }; 306 307 struct udp6_sock { 308 struct udp_sock udp; 309 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 310 struct ipv6_pinfo inet6; 311 }; 312 313 struct tcp6_sock { 314 struct tcp_sock tcp; 315 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 316 struct ipv6_pinfo inet6; 317 }; 318 319 extern int inet6_sk_rebuild_header(struct sock *sk); 320 321 struct tcp6_timewait_sock { 322 struct tcp_timewait_sock tcp6tw_tcp; 323 }; 324 325 #if IS_ENABLED(CONFIG_IPV6) 326 bool ipv6_mod_enabled(void); 327 328 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 329 { 330 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 331 } 332 333 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 334 { 335 return (struct raw6_sock *)sk; 336 } 337 338 static inline void inet_sk_copy_descendant(struct sock *sk_to, 339 const struct sock *sk_from) 340 { 341 int ancestor_size = sizeof(struct inet_sock); 342 343 if (sk_from->sk_family == PF_INET6) 344 ancestor_size += sizeof(struct ipv6_pinfo); 345 346 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 347 } 348 349 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 350 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 351 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 352 inet6_sk(sk)->rxopt.bits.rxinfo) 353 354 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 355 { 356 if (sk->sk_family == AF_INET6) 357 return &sk->sk_v6_rcv_saddr; 358 return NULL; 359 } 360 361 static inline int inet_v6_ipv6only(const struct sock *sk) 362 { 363 /* ipv6only field is at same position for timewait and other sockets */ 364 return ipv6_only_sock(sk); 365 } 366 #else 367 #define __ipv6_only_sock(sk) 0 368 #define ipv6_only_sock(sk) 0 369 #define ipv6_sk_rxinfo(sk) 0 370 371 static inline bool ipv6_mod_enabled(void) 372 { 373 return false; 374 } 375 376 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 377 { 378 return NULL; 379 } 380 381 static inline struct inet6_request_sock * 382 inet6_rsk(const struct request_sock *rsk) 383 { 384 return NULL; 385 } 386 387 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 388 { 389 return NULL; 390 } 391 392 #define inet6_rcv_saddr(__sk) NULL 393 #define tcp_twsk_ipv6only(__sk) 0 394 #define inet_v6_ipv6only(__sk) 0 395 #endif /* IS_ENABLED(CONFIG_IPV6) */ 396 #endif /* _IPV6_H */ 397