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 __u32 ra_defrtr_metric; 35 __s32 accept_ra_min_hop_limit; 36 __s32 accept_ra_pinfo; 37 __s32 ignore_routes_with_linkdown; 38 #ifdef CONFIG_IPV6_ROUTER_PREF 39 __s32 accept_ra_rtr_pref; 40 __s32 rtr_probe_interval; 41 #ifdef CONFIG_IPV6_ROUTE_INFO 42 __s32 accept_ra_rt_info_min_plen; 43 __s32 accept_ra_rt_info_max_plen; 44 #endif 45 #endif 46 __s32 proxy_ndp; 47 __s32 accept_source_route; 48 __s32 accept_ra_from_local; 49 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 50 __s32 optimistic_dad; 51 __s32 use_optimistic; 52 #endif 53 #ifdef CONFIG_IPV6_MROUTE 54 __s32 mc_forwarding; 55 #endif 56 __s32 disable_ipv6; 57 __s32 drop_unicast_in_l2_multicast; 58 __s32 accept_dad; 59 __s32 force_tllao; 60 __s32 ndisc_notify; 61 __s32 suppress_frag_ndisc; 62 __s32 accept_ra_mtu; 63 __s32 drop_unsolicited_na; 64 struct ipv6_stable_secret { 65 bool initialized; 66 struct in6_addr secret; 67 } stable_secret; 68 __s32 use_oif_addrs_only; 69 __s32 keep_addr_on_down; 70 __s32 seg6_enabled; 71 #ifdef CONFIG_IPV6_SEG6_HMAC 72 __s32 seg6_require_hmac; 73 #endif 74 __u32 enhanced_dad; 75 __u32 addr_gen_mode; 76 __s32 disable_policy; 77 __s32 ndisc_tclass; 78 __s32 rpl_seg_enabled; 79 80 struct ctl_table_header *sysctl_header; 81 }; 82 83 struct ipv6_params { 84 __s32 disable_ipv6; 85 __s32 autoconf; 86 }; 87 extern struct ipv6_params ipv6_defaults; 88 #include <linux/icmpv6.h> 89 #include <linux/tcp.h> 90 #include <linux/udp.h> 91 92 #include <net/inet_sock.h> 93 94 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 95 { 96 return (struct ipv6hdr *)skb_network_header(skb); 97 } 98 99 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 100 { 101 return (struct ipv6hdr *)skb_inner_network_header(skb); 102 } 103 104 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 105 { 106 return (struct ipv6hdr *)skb_transport_header(skb); 107 } 108 109 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb) 110 { 111 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) - 112 skb_network_header_len(skb); 113 } 114 115 /* 116 This structure contains results of exthdrs parsing 117 as offsets from skb->nh. 118 */ 119 120 struct inet6_skb_parm { 121 int iif; 122 __be16 ra; 123 __u16 dst0; 124 __u16 srcrt; 125 __u16 dst1; 126 __u16 lastopt; 127 __u16 nhoff; 128 __u16 flags; 129 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 130 __u16 dsthao; 131 #endif 132 __u16 frag_max_size; 133 134 #define IP6SKB_XFRM_TRANSFORMED 1 135 #define IP6SKB_FORWARDED 2 136 #define IP6SKB_REROUTED 4 137 #define IP6SKB_ROUTERALERT 8 138 #define IP6SKB_FRAGMENTED 16 139 #define IP6SKB_HOPBYHOP 32 140 #define IP6SKB_L3SLAVE 64 141 #define IP6SKB_JUMBOGRAM 128 142 }; 143 144 #if defined(CONFIG_NET_L3_MASTER_DEV) 145 static inline bool ipv6_l3mdev_skb(__u16 flags) 146 { 147 return flags & IP6SKB_L3SLAVE; 148 } 149 #else 150 static inline bool ipv6_l3mdev_skb(__u16 flags) 151 { 152 return false; 153 } 154 #endif 155 156 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 157 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 158 159 static inline int inet6_iif(const struct sk_buff *skb) 160 { 161 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 162 163 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 164 } 165 166 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 167 { 168 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 169 } 170 171 /* can not be used in TCP layer after tcp_v6_fill_cb */ 172 static inline int inet6_sdif(const struct sk_buff *skb) 173 { 174 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 175 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 176 return IP6CB(skb)->iif; 177 #endif 178 return 0; 179 } 180 181 struct tcp6_request_sock { 182 struct tcp_request_sock tcp6rsk_tcp; 183 }; 184 185 struct ipv6_mc_socklist; 186 struct ipv6_ac_socklist; 187 struct ipv6_fl_socklist; 188 189 struct inet6_cork { 190 struct ipv6_txoptions *opt; 191 u8 hop_limit; 192 u8 tclass; 193 }; 194 195 /** 196 * struct ipv6_pinfo - ipv6 private area 197 * 198 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 199 * this _must_ be the last member, so that inet6_sk_generic 200 * is able to calculate its offset from the base struct sock 201 * by using the struct proto->slab_obj_size member. -acme 202 */ 203 struct ipv6_pinfo { 204 struct in6_addr saddr; 205 struct in6_pktinfo sticky_pktinfo; 206 const struct in6_addr *daddr_cache; 207 #ifdef CONFIG_IPV6_SUBTREES 208 const struct in6_addr *saddr_cache; 209 #endif 210 211 __be32 flow_label; 212 __u32 frag_size; 213 214 /* 215 * Packed in 16bits. 216 * Omit one shift by putting the signed field at MSB. 217 */ 218 #if defined(__BIG_ENDIAN_BITFIELD) 219 __s16 hop_limit:9; 220 __u16 __unused_1:7; 221 #else 222 __u16 __unused_1:7; 223 __s16 hop_limit:9; 224 #endif 225 226 #if defined(__BIG_ENDIAN_BITFIELD) 227 /* Packed in 16bits. */ 228 __s16 mcast_hops:9; 229 __u16 __unused_2:6, 230 mc_loop:1; 231 #else 232 __u16 mc_loop:1, 233 __unused_2:6; 234 __s16 mcast_hops:9; 235 #endif 236 int ucast_oif; 237 int mcast_oif; 238 239 /* pktoption flags */ 240 union { 241 struct { 242 __u16 srcrt:1, 243 osrcrt:1, 244 rxinfo:1, 245 rxoinfo:1, 246 rxhlim:1, 247 rxohlim:1, 248 hopopts:1, 249 ohopopts:1, 250 dstopts:1, 251 odstopts:1, 252 rxflow:1, 253 rxtclass:1, 254 rxpmtu:1, 255 rxorigdstaddr:1, 256 recvfragsize:1; 257 /* 1 bits hole */ 258 } bits; 259 __u16 all; 260 } rxopt; 261 262 /* sockopt flags */ 263 __u16 recverr:1, 264 sndflow:1, 265 repflow:1, 266 pmtudisc:3, 267 padding:1, /* 1 bit hole */ 268 srcprefs:3, /* 001: prefer temporary address 269 * 010: prefer public address 270 * 100: prefer care-of address 271 */ 272 dontfrag:1, 273 autoflowlabel:1, 274 autoflowlabel_set:1, 275 mc_all:1, 276 recverr_rfc4884:1, 277 rtalert_isolate: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 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 339 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 340 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 341 inet6_sk(sk)->rxopt.bits.rxinfo) 342 343 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 344 { 345 if (sk->sk_family == AF_INET6) 346 return &sk->sk_v6_rcv_saddr; 347 return NULL; 348 } 349 350 static inline int inet_v6_ipv6only(const struct sock *sk) 351 { 352 /* ipv6only field is at same position for timewait and other sockets */ 353 return ipv6_only_sock(sk); 354 } 355 #else 356 #define __ipv6_only_sock(sk) 0 357 #define ipv6_only_sock(sk) 0 358 #define ipv6_sk_rxinfo(sk) 0 359 360 static inline bool ipv6_mod_enabled(void) 361 { 362 return false; 363 } 364 365 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 366 { 367 return NULL; 368 } 369 370 static inline struct inet6_request_sock * 371 inet6_rsk(const struct request_sock *rsk) 372 { 373 return NULL; 374 } 375 376 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 377 { 378 return NULL; 379 } 380 381 #define inet6_rcv_saddr(__sk) NULL 382 #define tcp_twsk_ipv6only(__sk) 0 383 #define inet_v6_ipv6only(__sk) 0 384 #endif /* IS_ENABLED(CONFIG_IPV6) */ 385 #endif /* _IPV6_H */ 386