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_min_rtr_lft; 37 __s32 accept_ra_pinfo; 38 __s32 ignore_routes_with_linkdown; 39 #ifdef CONFIG_IPV6_ROUTER_PREF 40 __s32 accept_ra_rtr_pref; 41 __s32 rtr_probe_interval; 42 #ifdef CONFIG_IPV6_ROUTE_INFO 43 __s32 accept_ra_rt_info_min_plen; 44 __s32 accept_ra_rt_info_max_plen; 45 #endif 46 #endif 47 __s32 proxy_ndp; 48 __s32 accept_source_route; 49 __s32 accept_ra_from_local; 50 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 51 __s32 optimistic_dad; 52 __s32 use_optimistic; 53 #endif 54 #ifdef CONFIG_IPV6_MROUTE 55 atomic_t mc_forwarding; 56 #endif 57 __s32 disable_ipv6; 58 __s32 drop_unicast_in_l2_multicast; 59 __s32 accept_dad; 60 __s32 force_tllao; 61 __s32 ndisc_notify; 62 __s32 suppress_frag_ndisc; 63 __s32 accept_ra_mtu; 64 __s32 drop_unsolicited_na; 65 __s32 accept_untracked_na; 66 struct ipv6_stable_secret { 67 bool initialized; 68 struct in6_addr secret; 69 } stable_secret; 70 __s32 use_oif_addrs_only; 71 __s32 keep_addr_on_down; 72 __s32 seg6_enabled; 73 #ifdef CONFIG_IPV6_SEG6_HMAC 74 __s32 seg6_require_hmac; 75 #endif 76 __u32 enhanced_dad; 77 __u32 addr_gen_mode; 78 __s32 disable_policy; 79 __s32 ndisc_tclass; 80 __s32 rpl_seg_enabled; 81 __u32 ioam6_id; 82 __u32 ioam6_id_wide; 83 __u8 ioam6_enabled; 84 __u8 ndisc_evict_nocarrier; 85 86 struct ctl_table_header *sysctl_header; 87 }; 88 89 struct ipv6_params { 90 __s32 disable_ipv6; 91 __s32 autoconf; 92 }; 93 extern struct ipv6_params ipv6_defaults; 94 #include <linux/tcp.h> 95 #include <linux/udp.h> 96 97 #include <net/inet_sock.h> 98 99 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 100 { 101 return (struct ipv6hdr *)skb_network_header(skb); 102 } 103 104 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 105 { 106 return (struct ipv6hdr *)skb_inner_network_header(skb); 107 } 108 109 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 110 { 111 return (struct ipv6hdr *)skb_transport_header(skb); 112 } 113 114 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb) 115 { 116 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) - 117 skb_network_header_len(skb); 118 } 119 120 /* 121 This structure contains results of exthdrs parsing 122 as offsets from skb->nh. 123 */ 124 125 struct inet6_skb_parm { 126 int iif; 127 __be16 ra; 128 __u16 dst0; 129 __u16 srcrt; 130 __u16 dst1; 131 __u16 lastopt; 132 __u16 nhoff; 133 __u16 flags; 134 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 135 __u16 dsthao; 136 #endif 137 __u16 frag_max_size; 138 __u16 srhoff; 139 140 #define IP6SKB_XFRM_TRANSFORMED 1 141 #define IP6SKB_FORWARDED 2 142 #define IP6SKB_REROUTED 4 143 #define IP6SKB_ROUTERALERT 8 144 #define IP6SKB_FRAGMENTED 16 145 #define IP6SKB_HOPBYHOP 32 146 #define IP6SKB_L3SLAVE 64 147 #define IP6SKB_JUMBOGRAM 128 148 #define IP6SKB_SEG6 256 149 #define IP6SKB_FAKEJUMBO 512 150 }; 151 152 #if defined(CONFIG_NET_L3_MASTER_DEV) 153 static inline bool ipv6_l3mdev_skb(__u16 flags) 154 { 155 return flags & IP6SKB_L3SLAVE; 156 } 157 #else 158 static inline bool ipv6_l3mdev_skb(__u16 flags) 159 { 160 return false; 161 } 162 #endif 163 164 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 165 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 166 167 static inline int inet6_iif(const struct sk_buff *skb) 168 { 169 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 170 171 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 172 } 173 174 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 175 { 176 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 177 } 178 179 /* can not be used in TCP layer after tcp_v6_fill_cb */ 180 static inline int inet6_sdif(const struct sk_buff *skb) 181 { 182 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 183 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 184 return IP6CB(skb)->iif; 185 #endif 186 return 0; 187 } 188 189 struct tcp6_request_sock { 190 struct tcp_request_sock tcp6rsk_tcp; 191 }; 192 193 struct ipv6_mc_socklist; 194 struct ipv6_ac_socklist; 195 struct ipv6_fl_socklist; 196 197 struct inet6_cork { 198 struct ipv6_txoptions *opt; 199 u8 hop_limit; 200 u8 tclass; 201 }; 202 203 /** 204 * struct ipv6_pinfo - ipv6 private area 205 * 206 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc) 207 * this _must_ be the last member, so that inet6_sk_generic 208 * is able to calculate its offset from the base struct sock 209 * by using the struct proto->slab_obj_size member. -acme 210 */ 211 struct ipv6_pinfo { 212 struct in6_addr saddr; 213 struct in6_pktinfo sticky_pktinfo; 214 const struct in6_addr *daddr_cache; 215 #ifdef CONFIG_IPV6_SUBTREES 216 const struct in6_addr *saddr_cache; 217 #endif 218 219 __be32 flow_label; 220 __u32 frag_size; 221 222 /* 223 * Packed in 16bits. 224 * Omit one shift by putting the signed field at MSB. 225 */ 226 #if defined(__BIG_ENDIAN_BITFIELD) 227 __s16 hop_limit:9; 228 __u16 __unused_1:7; 229 #else 230 __u16 __unused_1:7; 231 __s16 hop_limit:9; 232 #endif 233 234 #if defined(__BIG_ENDIAN_BITFIELD) 235 /* Packed in 16bits. */ 236 __s16 mcast_hops:9; 237 __u16 __unused_2:6, 238 mc_loop:1; 239 #else 240 __u16 mc_loop:1, 241 __unused_2:6; 242 __s16 mcast_hops:9; 243 #endif 244 int ucast_oif; 245 int mcast_oif; 246 247 /* pktoption flags */ 248 union { 249 struct { 250 __u16 srcrt:1, 251 osrcrt:1, 252 rxinfo:1, 253 rxoinfo:1, 254 rxhlim:1, 255 rxohlim:1, 256 hopopts:1, 257 ohopopts:1, 258 dstopts:1, 259 odstopts:1, 260 rxflow:1, 261 rxtclass:1, 262 rxpmtu:1, 263 rxorigdstaddr:1, 264 recvfragsize:1; 265 /* 1 bits hole */ 266 } bits; 267 __u16 all; 268 } rxopt; 269 270 /* sockopt flags */ 271 __u16 recverr:1, 272 sndflow:1, 273 repflow:1, 274 pmtudisc:3, 275 padding:1, /* 1 bit hole */ 276 srcprefs:3, /* 001: prefer temporary address 277 * 010: prefer public address 278 * 100: prefer care-of address 279 */ 280 dontfrag:1, 281 autoflowlabel:1, 282 autoflowlabel_set:1, 283 mc_all:1, 284 recverr_rfc4884:1, 285 rtalert_isolate:1; 286 __u8 min_hopcount; 287 __u8 tclass; 288 __be32 rcv_flowinfo; 289 290 __u32 dst_cookie; 291 292 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 293 struct ipv6_ac_socklist *ipv6_ac_list; 294 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 295 296 struct ipv6_txoptions __rcu *opt; 297 struct sk_buff *pktoptions; 298 struct sk_buff *rxpmtu; 299 struct inet6_cork cork; 300 }; 301 302 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 303 struct raw6_sock { 304 /* inet_sock has to be the first member of raw6_sock */ 305 struct inet_sock inet; 306 __u32 checksum; /* perform checksum */ 307 __u32 offset; /* checksum offset */ 308 struct icmp6_filter filter; 309 __u32 ip6mr_table; 310 /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */ 311 struct ipv6_pinfo inet6; 312 }; 313 314 struct udp6_sock { 315 struct udp_sock udp; 316 /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */ 317 struct ipv6_pinfo inet6; 318 }; 319 320 struct tcp6_sock { 321 struct tcp_sock tcp; 322 /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */ 323 struct ipv6_pinfo inet6; 324 }; 325 326 extern int inet6_sk_rebuild_header(struct sock *sk); 327 328 struct tcp6_timewait_sock { 329 struct tcp_timewait_sock tcp6tw_tcp; 330 }; 331 332 #if IS_ENABLED(CONFIG_IPV6) 333 bool ipv6_mod_enabled(void); 334 335 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 336 { 337 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 338 } 339 340 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk) 341 342 #define ipv6_only_sock(sk) (sk->sk_ipv6only) 343 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 344 inet6_sk(sk)->rxopt.bits.rxinfo) 345 346 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 347 { 348 if (sk->sk_family == AF_INET6) 349 return &sk->sk_v6_rcv_saddr; 350 return NULL; 351 } 352 353 static inline int inet_v6_ipv6only(const struct sock *sk) 354 { 355 /* ipv6only field is at same position for timewait and other sockets */ 356 return ipv6_only_sock(sk); 357 } 358 #else 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 raw6_sock *raw6_sk(const struct sock *sk) 373 { 374 return NULL; 375 } 376 377 #define inet6_rcv_saddr(__sk) NULL 378 #define inet_v6_ipv6only(__sk) 0 379 #endif /* IS_ENABLED(CONFIG_IPV6) */ 380 #endif /* _IPV6_H */ 381