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_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 /* struct ipv6_pinfo - ipv6 private area */ 204 struct ipv6_pinfo { 205 struct in6_addr saddr; 206 struct in6_pktinfo sticky_pktinfo; 207 const struct in6_addr *daddr_cache; 208 #ifdef CONFIG_IPV6_SUBTREES 209 const struct in6_addr *saddr_cache; 210 #endif 211 212 __be32 flow_label; 213 __u32 frag_size; 214 215 /* 216 * Packed in 16bits. 217 * Omit one shift by putting the signed field at MSB. 218 */ 219 #if defined(__BIG_ENDIAN_BITFIELD) 220 __s16 hop_limit:9; 221 __u16 __unused_1:7; 222 #else 223 __u16 __unused_1:7; 224 __s16 hop_limit:9; 225 #endif 226 227 #if defined(__BIG_ENDIAN_BITFIELD) 228 /* Packed in 16bits. */ 229 __s16 mcast_hops:9; 230 __u16 __unused_2:6, 231 mc_loop:1; 232 #else 233 __u16 mc_loop:1, 234 __unused_2:6; 235 __s16 mcast_hops:9; 236 #endif 237 int ucast_oif; 238 int mcast_oif; 239 240 /* pktoption flags */ 241 union { 242 struct { 243 __u16 srcrt:1, 244 osrcrt:1, 245 rxinfo:1, 246 rxoinfo:1, 247 rxhlim:1, 248 rxohlim:1, 249 hopopts:1, 250 ohopopts:1, 251 dstopts:1, 252 odstopts:1, 253 rxflow:1, 254 rxtclass:1, 255 rxpmtu:1, 256 rxorigdstaddr:1, 257 recvfragsize:1; 258 /* 1 bits hole */ 259 } bits; 260 __u16 all; 261 } rxopt; 262 263 /* sockopt flags */ 264 __u16 recverr:1, 265 sndflow:1, 266 repflow:1, 267 pmtudisc:3, 268 padding:1, /* 1 bit hole */ 269 srcprefs:3, /* 001: prefer temporary address 270 * 010: prefer public address 271 * 100: prefer care-of address 272 */ 273 dontfrag:1, 274 autoflowlabel:1, 275 autoflowlabel_set:1, 276 mc_all:1, 277 recverr_rfc4884:1, 278 rtalert_isolate:1; 279 __u8 min_hopcount; 280 __u8 tclass; 281 __be32 rcv_flowinfo; 282 283 __u32 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; 303 304 struct ipv6_pinfo inet6; 305 }; 306 307 struct udp6_sock { 308 struct udp_sock udp; 309 310 struct ipv6_pinfo inet6; 311 }; 312 313 struct tcp6_sock { 314 struct tcp_sock tcp; 315 316 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 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk) 334 335 #define ipv6_only_sock(sk) (sk->sk_ipv6only) 336 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 337 inet6_sk(sk)->rxopt.bits.rxinfo) 338 339 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 340 { 341 if (sk->sk_family == AF_INET6) 342 return &sk->sk_v6_rcv_saddr; 343 return NULL; 344 } 345 346 static inline int inet_v6_ipv6only(const struct sock *sk) 347 { 348 /* ipv6only field is at same position for timewait and other sockets */ 349 return ipv6_only_sock(sk); 350 } 351 #else 352 #define ipv6_only_sock(sk) 0 353 #define ipv6_sk_rxinfo(sk) 0 354 355 static inline bool ipv6_mod_enabled(void) 356 { 357 return false; 358 } 359 360 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 361 { 362 return NULL; 363 } 364 365 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 366 { 367 return NULL; 368 } 369 370 #define inet6_rcv_saddr(__sk) NULL 371 #define inet_v6_ipv6only(__sk) 0 372 #endif /* IS_ENABLED(CONFIG_IPV6) */ 373 #endif /* _IPV6_H */ 374