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 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb) 108 { 109 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) - 110 skb_network_header_len(skb); 111 } 112 113 /* 114 This structure contains results of exthdrs parsing 115 as offsets from skb->nh. 116 */ 117 118 struct inet6_skb_parm { 119 int iif; 120 __be16 ra; 121 __u16 dst0; 122 __u16 srcrt; 123 __u16 dst1; 124 __u16 lastopt; 125 __u16 nhoff; 126 __u16 flags; 127 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 128 __u16 dsthao; 129 #endif 130 __u16 frag_max_size; 131 132 #define IP6SKB_XFRM_TRANSFORMED 1 133 #define IP6SKB_FORWARDED 2 134 #define IP6SKB_REROUTED 4 135 #define IP6SKB_ROUTERALERT 8 136 #define IP6SKB_FRAGMENTED 16 137 #define IP6SKB_HOPBYHOP 32 138 #define IP6SKB_L3SLAVE 64 139 #define IP6SKB_JUMBOGRAM 128 140 }; 141 142 #if defined(CONFIG_NET_L3_MASTER_DEV) 143 static inline bool ipv6_l3mdev_skb(__u16 flags) 144 { 145 return flags & IP6SKB_L3SLAVE; 146 } 147 #else 148 static inline bool ipv6_l3mdev_skb(__u16 flags) 149 { 150 return false; 151 } 152 #endif 153 154 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 155 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 156 157 static inline int inet6_iif(const struct sk_buff *skb) 158 { 159 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 160 161 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 162 } 163 164 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 165 { 166 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 167 } 168 169 /* can not be used in TCP layer after tcp_v6_fill_cb */ 170 static inline int inet6_sdif(const struct sk_buff *skb) 171 { 172 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 173 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 174 return IP6CB(skb)->iif; 175 #endif 176 return 0; 177 } 178 179 /* can not be used in TCP layer after tcp_v6_fill_cb */ 180 static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb) 181 { 182 #if defined(CONFIG_NET_L3_MASTER_DEV) 183 if (!net->ipv4.sysctl_tcp_l3mdev_accept && 184 skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 185 return true; 186 #endif 187 return false; 188 } 189 190 struct tcp6_request_sock { 191 struct tcp_request_sock tcp6rsk_tcp; 192 }; 193 194 struct ipv6_mc_socklist; 195 struct ipv6_ac_socklist; 196 struct ipv6_fl_socklist; 197 198 struct inet6_cork { 199 struct ipv6_txoptions *opt; 200 u8 hop_limit; 201 u8 tclass; 202 }; 203 204 /** 205 * struct ipv6_pinfo - ipv6 private area 206 * 207 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 208 * this _must_ be the last member, so that inet6_sk_generic 209 * is able to calculate its offset from the base struct sock 210 * by using the struct proto->slab_obj_size member. -acme 211 */ 212 struct ipv6_pinfo { 213 struct in6_addr saddr; 214 struct in6_pktinfo sticky_pktinfo; 215 const struct in6_addr *daddr_cache; 216 #ifdef CONFIG_IPV6_SUBTREES 217 const struct in6_addr *saddr_cache; 218 #endif 219 220 __be32 flow_label; 221 __u32 frag_size; 222 223 /* 224 * Packed in 16bits. 225 * Omit one shift by by putting the signed field at MSB. 226 */ 227 #if defined(__BIG_ENDIAN_BITFIELD) 228 __s16 hop_limit:9; 229 __u16 __unused_1:7; 230 #else 231 __u16 __unused_1:7; 232 __s16 hop_limit:9; 233 #endif 234 235 #if defined(__BIG_ENDIAN_BITFIELD) 236 /* Packed in 16bits. */ 237 __s16 mcast_hops:9; 238 __u16 __unused_2:6, 239 mc_loop:1; 240 #else 241 __u16 mc_loop:1, 242 __unused_2:6; 243 __s16 mcast_hops:9; 244 #endif 245 int ucast_oif; 246 int mcast_oif; 247 248 /* pktoption flags */ 249 union { 250 struct { 251 __u16 srcrt:1, 252 osrcrt:1, 253 rxinfo:1, 254 rxoinfo:1, 255 rxhlim:1, 256 rxohlim:1, 257 hopopts:1, 258 ohopopts:1, 259 dstopts:1, 260 odstopts:1, 261 rxflow:1, 262 rxtclass:1, 263 rxpmtu:1, 264 rxorigdstaddr:1, 265 recvfragsize:1; 266 /* 1 bits hole */ 267 } bits; 268 __u16 all; 269 } rxopt; 270 271 /* sockopt flags */ 272 __u16 recverr:1, 273 sndflow:1, 274 repflow:1, 275 pmtudisc:3, 276 padding:1, /* 1 bit hole */ 277 srcprefs:3, /* 001: prefer temporary address 278 * 010: prefer public address 279 * 100: prefer care-of address 280 */ 281 dontfrag:1, 282 autoflowlabel:1, 283 autoflowlabel_set:1, 284 mc_all:1, 285 rtalert_isolate:1; 286 __u8 min_hopcount; 287 __u8 tclass; 288 __be32 rcv_flowinfo; 289 290 __u32 dst_cookie; 291 __u32 rx_dst_cookie; 292 293 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 294 struct ipv6_ac_socklist *ipv6_ac_list; 295 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 296 297 struct ipv6_txoptions __rcu *opt; 298 struct sk_buff *pktoptions; 299 struct sk_buff *rxpmtu; 300 struct inet6_cork cork; 301 }; 302 303 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 304 struct raw6_sock { 305 /* inet_sock has to be the first member of raw6_sock */ 306 struct inet_sock inet; 307 __u32 checksum; /* perform checksum */ 308 __u32 offset; /* checksum offset */ 309 struct icmp6_filter filter; 310 __u32 ip6mr_table; 311 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 312 struct ipv6_pinfo inet6; 313 }; 314 315 struct udp6_sock { 316 struct udp_sock udp; 317 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 318 struct ipv6_pinfo inet6; 319 }; 320 321 struct tcp6_sock { 322 struct tcp_sock tcp; 323 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 324 struct ipv6_pinfo inet6; 325 }; 326 327 extern int inet6_sk_rebuild_header(struct sock *sk); 328 329 struct tcp6_timewait_sock { 330 struct tcp_timewait_sock tcp6tw_tcp; 331 }; 332 333 #if IS_ENABLED(CONFIG_IPV6) 334 bool ipv6_mod_enabled(void); 335 336 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 337 { 338 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 339 } 340 341 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 342 { 343 return (struct raw6_sock *)sk; 344 } 345 346 static inline void inet_sk_copy_descendant(struct sock *sk_to, 347 const struct sock *sk_from) 348 { 349 int ancestor_size = sizeof(struct inet_sock); 350 351 if (sk_from->sk_family == PF_INET6) 352 ancestor_size += sizeof(struct ipv6_pinfo); 353 354 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size); 355 } 356 357 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 358 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 359 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 360 inet6_sk(sk)->rxopt.bits.rxinfo) 361 362 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 363 { 364 if (sk->sk_family == AF_INET6) 365 return &sk->sk_v6_rcv_saddr; 366 return NULL; 367 } 368 369 static inline int inet_v6_ipv6only(const struct sock *sk) 370 { 371 /* ipv6only field is at same position for timewait and other sockets */ 372 return ipv6_only_sock(sk); 373 } 374 #else 375 #define __ipv6_only_sock(sk) 0 376 #define ipv6_only_sock(sk) 0 377 #define ipv6_sk_rxinfo(sk) 0 378 379 static inline bool ipv6_mod_enabled(void) 380 { 381 return false; 382 } 383 384 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 385 { 386 return NULL; 387 } 388 389 static inline struct inet6_request_sock * 390 inet6_rsk(const struct request_sock *rsk) 391 { 392 return NULL; 393 } 394 395 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 396 { 397 return NULL; 398 } 399 400 #define inet6_rcv_saddr(__sk) NULL 401 #define tcp_twsk_ipv6only(__sk) 0 402 #define inet_v6_ipv6only(__sk) 0 403 #endif /* IS_ENABLED(CONFIG_IPV6) */ 404 #endif /* _IPV6_H */ 405