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 atomic_t 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 __s32 accept_unsolicited_na; 65 struct ipv6_stable_secret { 66 bool initialized; 67 struct in6_addr secret; 68 } stable_secret; 69 __s32 use_oif_addrs_only; 70 __s32 keep_addr_on_down; 71 __s32 seg6_enabled; 72 #ifdef CONFIG_IPV6_SEG6_HMAC 73 __s32 seg6_require_hmac; 74 #endif 75 __u32 enhanced_dad; 76 __u32 addr_gen_mode; 77 __s32 disable_policy; 78 __s32 ndisc_tclass; 79 __s32 rpl_seg_enabled; 80 __u32 ioam6_id; 81 __u32 ioam6_id_wide; 82 __u8 ioam6_enabled; 83 __u8 ndisc_evict_nocarrier; 84 85 struct ctl_table_header *sysctl_header; 86 }; 87 88 struct ipv6_params { 89 __s32 disable_ipv6; 90 __s32 autoconf; 91 }; 92 extern struct ipv6_params ipv6_defaults; 93 #include <linux/tcp.h> 94 #include <linux/udp.h> 95 96 #include <net/inet_sock.h> 97 98 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 99 { 100 return (struct ipv6hdr *)skb_network_header(skb); 101 } 102 103 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 104 { 105 return (struct ipv6hdr *)skb_inner_network_header(skb); 106 } 107 108 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 109 { 110 return (struct ipv6hdr *)skb_transport_header(skb); 111 } 112 113 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb) 114 { 115 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) - 116 skb_network_header_len(skb); 117 } 118 119 /* 120 This structure contains results of exthdrs parsing 121 as offsets from skb->nh. 122 */ 123 124 struct inet6_skb_parm { 125 int iif; 126 __be16 ra; 127 __u16 dst0; 128 __u16 srcrt; 129 __u16 dst1; 130 __u16 lastopt; 131 __u16 nhoff; 132 __u16 flags; 133 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 134 __u16 dsthao; 135 #endif 136 __u16 frag_max_size; 137 __u16 srhoff; 138 139 #define IP6SKB_XFRM_TRANSFORMED 1 140 #define IP6SKB_FORWARDED 2 141 #define IP6SKB_REROUTED 4 142 #define IP6SKB_ROUTERALERT 8 143 #define IP6SKB_FRAGMENTED 16 144 #define IP6SKB_HOPBYHOP 32 145 #define IP6SKB_L3SLAVE 64 146 #define IP6SKB_JUMBOGRAM 128 147 #define IP6SKB_SEG6 256 148 }; 149 150 #if defined(CONFIG_NET_L3_MASTER_DEV) 151 static inline bool ipv6_l3mdev_skb(__u16 flags) 152 { 153 return flags & IP6SKB_L3SLAVE; 154 } 155 #else 156 static inline bool ipv6_l3mdev_skb(__u16 flags) 157 { 158 return false; 159 } 160 #endif 161 162 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 163 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 164 165 static inline int inet6_iif(const struct sk_buff *skb) 166 { 167 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 168 169 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 170 } 171 172 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 173 { 174 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 175 } 176 177 /* can not be used in TCP layer after tcp_v6_fill_cb */ 178 static inline int inet6_sdif(const struct sk_buff *skb) 179 { 180 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 181 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 182 return IP6CB(skb)->iif; 183 #endif 184 return 0; 185 } 186 187 struct tcp6_request_sock { 188 struct tcp_request_sock tcp6rsk_tcp; 189 }; 190 191 struct ipv6_mc_socklist; 192 struct ipv6_ac_socklist; 193 struct ipv6_fl_socklist; 194 195 struct inet6_cork { 196 struct ipv6_txoptions *opt; 197 u8 hop_limit; 198 u8 tclass; 199 }; 200 201 /** 202 * struct ipv6_pinfo - ipv6 private area 203 * 204 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 205 * this _must_ be the last member, so that inet6_sk_generic 206 * is able to calculate its offset from the base struct sock 207 * by using the struct proto->slab_obj_size member. -acme 208 */ 209 struct ipv6_pinfo { 210 struct in6_addr saddr; 211 struct in6_pktinfo sticky_pktinfo; 212 const struct in6_addr *daddr_cache; 213 #ifdef CONFIG_IPV6_SUBTREES 214 const struct in6_addr *saddr_cache; 215 #endif 216 217 __be32 flow_label; 218 __u32 frag_size; 219 220 /* 221 * Packed in 16bits. 222 * Omit one shift by putting the signed field at MSB. 223 */ 224 #if defined(__BIG_ENDIAN_BITFIELD) 225 __s16 hop_limit:9; 226 __u16 __unused_1:7; 227 #else 228 __u16 __unused_1:7; 229 __s16 hop_limit:9; 230 #endif 231 232 #if defined(__BIG_ENDIAN_BITFIELD) 233 /* Packed in 16bits. */ 234 __s16 mcast_hops:9; 235 __u16 __unused_2:6, 236 mc_loop:1; 237 #else 238 __u16 mc_loop:1, 239 __unused_2:6; 240 __s16 mcast_hops:9; 241 #endif 242 int ucast_oif; 243 int mcast_oif; 244 245 /* pktoption flags */ 246 union { 247 struct { 248 __u16 srcrt:1, 249 osrcrt:1, 250 rxinfo:1, 251 rxoinfo:1, 252 rxhlim:1, 253 rxohlim:1, 254 hopopts:1, 255 ohopopts:1, 256 dstopts:1, 257 odstopts:1, 258 rxflow:1, 259 rxtclass:1, 260 rxpmtu:1, 261 rxorigdstaddr:1, 262 recvfragsize:1; 263 /* 1 bits hole */ 264 } bits; 265 __u16 all; 266 } rxopt; 267 268 /* sockopt flags */ 269 __u16 recverr:1, 270 sndflow:1, 271 repflow:1, 272 pmtudisc:3, 273 padding:1, /* 1 bit hole */ 274 srcprefs:3, /* 001: prefer temporary address 275 * 010: prefer public address 276 * 100: prefer care-of address 277 */ 278 dontfrag:1, 279 autoflowlabel:1, 280 autoflowlabel_set:1, 281 mc_all:1, 282 recverr_rfc4884:1, 283 rtalert_isolate:1; 284 __u8 min_hopcount; 285 __u8 tclass; 286 __be32 rcv_flowinfo; 287 288 __u32 dst_cookie; 289 290 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 291 struct ipv6_ac_socklist *ipv6_ac_list; 292 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 293 294 struct ipv6_txoptions __rcu *opt; 295 struct sk_buff *pktoptions; 296 struct sk_buff *rxpmtu; 297 struct inet6_cork cork; 298 }; 299 300 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 301 struct raw6_sock { 302 /* inet_sock has to be the first member of raw6_sock */ 303 struct inet_sock inet; 304 __u32 checksum; /* perform checksum */ 305 __u32 offset; /* checksum offset */ 306 struct icmp6_filter filter; 307 __u32 ip6mr_table; 308 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 309 struct ipv6_pinfo inet6; 310 }; 311 312 struct udp6_sock { 313 struct udp_sock udp; 314 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 315 struct ipv6_pinfo inet6; 316 }; 317 318 struct tcp6_sock { 319 struct tcp_sock tcp; 320 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 321 struct ipv6_pinfo inet6; 322 }; 323 324 extern int inet6_sk_rebuild_header(struct sock *sk); 325 326 struct tcp6_timewait_sock { 327 struct tcp_timewait_sock tcp6tw_tcp; 328 }; 329 330 #if IS_ENABLED(CONFIG_IPV6) 331 bool ipv6_mod_enabled(void); 332 333 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 334 { 335 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 336 } 337 338 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 339 { 340 return (struct raw6_sock *)sk; 341 } 342 343 #define ipv6_only_sock(sk) (sk->sk_ipv6only) 344 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 345 inet6_sk(sk)->rxopt.bits.rxinfo) 346 347 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 348 { 349 if (sk->sk_family == AF_INET6) 350 return &sk->sk_v6_rcv_saddr; 351 return NULL; 352 } 353 354 static inline int inet_v6_ipv6only(const struct sock *sk) 355 { 356 /* ipv6only field is at same position for timewait and other sockets */ 357 return ipv6_only_sock(sk); 358 } 359 #else 360 #define ipv6_only_sock(sk) 0 361 #define ipv6_sk_rxinfo(sk) 0 362 363 static inline bool ipv6_mod_enabled(void) 364 { 365 return false; 366 } 367 368 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 369 { 370 return NULL; 371 } 372 373 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 374 { 375 return NULL; 376 } 377 378 #define inet6_rcv_saddr(__sk) NULL 379 #define inet_v6_ipv6only(__sk) 0 380 #endif /* IS_ENABLED(CONFIG_IPV6) */ 381 #endif /* _IPV6_H */ 382