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 __u32 ioam6_id; 80 __u32 ioam6_id_wide; 81 __u8 ioam6_enabled; 82 __u8 ndisc_evict_nocarrier; 83 84 struct ctl_table_header *sysctl_header; 85 }; 86 87 struct ipv6_params { 88 __s32 disable_ipv6; 89 __s32 autoconf; 90 }; 91 extern struct ipv6_params ipv6_defaults; 92 #include <linux/tcp.h> 93 #include <linux/udp.h> 94 95 #include <net/inet_sock.h> 96 97 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 98 { 99 return (struct ipv6hdr *)skb_network_header(skb); 100 } 101 102 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 103 { 104 return (struct ipv6hdr *)skb_inner_network_header(skb); 105 } 106 107 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 108 { 109 return (struct ipv6hdr *)skb_transport_header(skb); 110 } 111 112 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb) 113 { 114 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) - 115 skb_network_header_len(skb); 116 } 117 118 /* 119 This structure contains results of exthdrs parsing 120 as offsets from skb->nh. 121 */ 122 123 struct inet6_skb_parm { 124 int iif; 125 __be16 ra; 126 __u16 dst0; 127 __u16 srcrt; 128 __u16 dst1; 129 __u16 lastopt; 130 __u16 nhoff; 131 __u16 flags; 132 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 133 __u16 dsthao; 134 #endif 135 __u16 frag_max_size; 136 137 #define IP6SKB_XFRM_TRANSFORMED 1 138 #define IP6SKB_FORWARDED 2 139 #define IP6SKB_REROUTED 4 140 #define IP6SKB_ROUTERALERT 8 141 #define IP6SKB_FRAGMENTED 16 142 #define IP6SKB_HOPBYHOP 32 143 #define IP6SKB_L3SLAVE 64 144 #define IP6SKB_JUMBOGRAM 128 145 }; 146 147 #if defined(CONFIG_NET_L3_MASTER_DEV) 148 static inline bool ipv6_l3mdev_skb(__u16 flags) 149 { 150 return flags & IP6SKB_L3SLAVE; 151 } 152 #else 153 static inline bool ipv6_l3mdev_skb(__u16 flags) 154 { 155 return false; 156 } 157 #endif 158 159 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 160 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 161 162 static inline int inet6_iif(const struct sk_buff *skb) 163 { 164 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 165 166 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 167 } 168 169 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 170 { 171 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 172 } 173 174 /* can not be used in TCP layer after tcp_v6_fill_cb */ 175 static inline int inet6_sdif(const struct sk_buff *skb) 176 { 177 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 178 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 179 return IP6CB(skb)->iif; 180 #endif 181 return 0; 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 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 mc_all:1, 279 recverr_rfc4884:1, 280 rtalert_isolate:1; 281 __u8 min_hopcount; 282 __u8 tclass; 283 __be32 rcv_flowinfo; 284 285 __u32 dst_cookie; 286 287 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 288 struct ipv6_ac_socklist *ipv6_ac_list; 289 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 290 291 struct ipv6_txoptions __rcu *opt; 292 struct sk_buff *pktoptions; 293 struct sk_buff *rxpmtu; 294 struct inet6_cork cork; 295 }; 296 297 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 298 struct raw6_sock { 299 /* inet_sock has to be the first member of raw6_sock */ 300 struct inet_sock inet; 301 __u32 checksum; /* perform checksum */ 302 __u32 offset; /* checksum offset */ 303 struct icmp6_filter filter; 304 __u32 ip6mr_table; 305 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 306 struct ipv6_pinfo inet6; 307 }; 308 309 struct udp6_sock { 310 struct udp_sock udp; 311 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 312 struct ipv6_pinfo inet6; 313 }; 314 315 struct tcp6_sock { 316 struct tcp_sock tcp; 317 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 318 struct ipv6_pinfo inet6; 319 }; 320 321 extern int inet6_sk_rebuild_header(struct sock *sk); 322 323 struct tcp6_timewait_sock { 324 struct tcp_timewait_sock tcp6tw_tcp; 325 }; 326 327 #if IS_ENABLED(CONFIG_IPV6) 328 bool ipv6_mod_enabled(void); 329 330 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 331 { 332 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 333 } 334 335 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 336 { 337 return (struct raw6_sock *)sk; 338 } 339 340 #define __ipv6_only_sock(sk) (sk->sk_ipv6only) 341 #define ipv6_only_sock(sk) (__ipv6_only_sock(sk)) 342 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 343 inet6_sk(sk)->rxopt.bits.rxinfo) 344 345 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 346 { 347 if (sk->sk_family == AF_INET6) 348 return &sk->sk_v6_rcv_saddr; 349 return NULL; 350 } 351 352 static inline int inet_v6_ipv6only(const struct sock *sk) 353 { 354 /* ipv6only field is at same position for timewait and other sockets */ 355 return ipv6_only_sock(sk); 356 } 357 #else 358 #define __ipv6_only_sock(sk) 0 359 #define ipv6_only_sock(sk) 0 360 #define ipv6_sk_rxinfo(sk) 0 361 362 static inline bool ipv6_mod_enabled(void) 363 { 364 return false; 365 } 366 367 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 368 { 369 return NULL; 370 } 371 372 static inline struct inet6_request_sock * 373 inet6_rsk(const struct request_sock *rsk) 374 { 375 return NULL; 376 } 377 378 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 379 { 380 return NULL; 381 } 382 383 #define inet6_rcv_saddr(__sk) NULL 384 #define tcp_twsk_ipv6only(__sk) 0 385 #define inet_v6_ipv6only(__sk) 0 386 #endif /* IS_ENABLED(CONFIG_IPV6) */ 387 #endif /* _IPV6_H */ 388