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_min_advance; 31 __s32 regen_max_retry; 32 __s32 max_desync_factor; 33 __s32 max_addresses; 34 __s32 accept_ra_defrtr; 35 __u32 ra_defrtr_metric; 36 __s32 accept_ra_min_hop_limit; 37 __s32 accept_ra_min_lft; 38 __s32 accept_ra_pinfo; 39 __s32 ignore_routes_with_linkdown; 40 #ifdef CONFIG_IPV6_ROUTER_PREF 41 __s32 accept_ra_rtr_pref; 42 __s32 rtr_probe_interval; 43 #ifdef CONFIG_IPV6_ROUTE_INFO 44 __s32 accept_ra_rt_info_min_plen; 45 __s32 accept_ra_rt_info_max_plen; 46 #endif 47 #endif 48 __s32 proxy_ndp; 49 __s32 accept_source_route; 50 __s32 accept_ra_from_local; 51 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 52 __s32 optimistic_dad; 53 __s32 use_optimistic; 54 #endif 55 #ifdef CONFIG_IPV6_MROUTE 56 atomic_t mc_forwarding; 57 #endif 58 __s32 disable_ipv6; 59 __s32 drop_unicast_in_l2_multicast; 60 __s32 accept_dad; 61 __s32 force_tllao; 62 __s32 ndisc_notify; 63 __s32 suppress_frag_ndisc; 64 __s32 accept_ra_mtu; 65 __s32 drop_unsolicited_na; 66 __s32 accept_untracked_na; 67 struct ipv6_stable_secret { 68 bool initialized; 69 struct in6_addr secret; 70 } stable_secret; 71 __s32 use_oif_addrs_only; 72 __s32 keep_addr_on_down; 73 __s32 seg6_enabled; 74 #ifdef CONFIG_IPV6_SEG6_HMAC 75 __s32 seg6_require_hmac; 76 #endif 77 __u32 enhanced_dad; 78 __u32 addr_gen_mode; 79 __s32 disable_policy; 80 __s32 ndisc_tclass; 81 __s32 rpl_seg_enabled; 82 __u32 ioam6_id; 83 __u32 ioam6_id_wide; 84 __u8 ioam6_enabled; 85 __u8 ndisc_evict_nocarrier; 86 __u8 ra_honor_pio_life; 87 88 struct ctl_table_header *sysctl_header; 89 }; 90 91 struct ipv6_params { 92 __s32 disable_ipv6; 93 __s32 autoconf; 94 }; 95 extern struct ipv6_params ipv6_defaults; 96 #include <linux/tcp.h> 97 #include <linux/udp.h> 98 99 #include <net/inet_sock.h> 100 101 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 102 { 103 return (struct ipv6hdr *)skb_network_header(skb); 104 } 105 106 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 107 { 108 return (struct ipv6hdr *)skb_inner_network_header(skb); 109 } 110 111 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 112 { 113 return (struct ipv6hdr *)skb_transport_header(skb); 114 } 115 116 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb) 117 { 118 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) - 119 skb_network_header_len(skb); 120 } 121 122 /* 123 This structure contains results of exthdrs parsing 124 as offsets from skb->nh. 125 */ 126 127 struct inet6_skb_parm { 128 int iif; 129 __be16 ra; 130 __u16 dst0; 131 __u16 srcrt; 132 __u16 dst1; 133 __u16 lastopt; 134 __u16 nhoff; 135 __u16 flags; 136 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 137 __u16 dsthao; 138 #endif 139 __u16 frag_max_size; 140 __u16 srhoff; 141 142 #define IP6SKB_XFRM_TRANSFORMED 1 143 #define IP6SKB_FORWARDED 2 144 #define IP6SKB_REROUTED 4 145 #define IP6SKB_ROUTERALERT 8 146 #define IP6SKB_FRAGMENTED 16 147 #define IP6SKB_HOPBYHOP 32 148 #define IP6SKB_L3SLAVE 64 149 #define IP6SKB_JUMBOGRAM 128 150 #define IP6SKB_SEG6 256 151 #define IP6SKB_FAKEJUMBO 512 152 #define IP6SKB_MULTIPATH 1024 153 }; 154 155 #if defined(CONFIG_NET_L3_MASTER_DEV) 156 static inline bool ipv6_l3mdev_skb(__u16 flags) 157 { 158 return flags & IP6SKB_L3SLAVE; 159 } 160 #else 161 static inline bool ipv6_l3mdev_skb(__u16 flags) 162 { 163 return false; 164 } 165 #endif 166 167 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 168 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 169 170 static inline int inet6_iif(const struct sk_buff *skb) 171 { 172 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 173 174 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 175 } 176 177 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 178 { 179 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 180 } 181 182 /* can not be used in TCP layer after tcp_v6_fill_cb */ 183 static inline int inet6_sdif(const struct sk_buff *skb) 184 { 185 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 186 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 187 return IP6CB(skb)->iif; 188 #endif 189 return 0; 190 } 191 192 struct tcp6_request_sock { 193 struct tcp_request_sock tcp6rsk_tcp; 194 }; 195 196 struct ipv6_mc_socklist; 197 struct ipv6_ac_socklist; 198 struct ipv6_fl_socklist; 199 200 struct inet6_cork { 201 struct ipv6_txoptions *opt; 202 u8 hop_limit; 203 u8 tclass; 204 }; 205 206 /* struct ipv6_pinfo - ipv6 private area */ 207 struct ipv6_pinfo { 208 struct in6_addr saddr; 209 struct in6_pktinfo sticky_pktinfo; 210 const struct in6_addr *daddr_cache; 211 #ifdef CONFIG_IPV6_SUBTREES 212 const struct in6_addr *saddr_cache; 213 #endif 214 215 __be32 flow_label; 216 __u32 frag_size; 217 218 s16 hop_limit; 219 u8 mcast_hops; 220 221 int ucast_oif; 222 int mcast_oif; 223 224 /* pktoption flags */ 225 union { 226 struct { 227 __u16 srcrt:1, 228 osrcrt:1, 229 rxinfo:1, 230 rxoinfo:1, 231 rxhlim:1, 232 rxohlim:1, 233 hopopts:1, 234 ohopopts:1, 235 dstopts:1, 236 odstopts:1, 237 rxflow:1, 238 rxtclass:1, 239 rxpmtu:1, 240 rxorigdstaddr:1, 241 recvfragsize:1; 242 /* 1 bits hole */ 243 } bits; 244 __u16 all; 245 } rxopt; 246 247 /* sockopt flags */ 248 __u8 srcprefs; /* 001: prefer temporary address 249 * 010: prefer public address 250 * 100: prefer care-of address 251 */ 252 __u8 pmtudisc; 253 __u8 min_hopcount; 254 __u8 tclass; 255 __be32 rcv_flowinfo; 256 257 __u32 dst_cookie; 258 259 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 260 struct ipv6_ac_socklist *ipv6_ac_list; 261 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 262 263 struct ipv6_txoptions __rcu *opt; 264 struct sk_buff *pktoptions; 265 struct sk_buff *rxpmtu; 266 struct inet6_cork cork; 267 }; 268 269 /* We currently use available bits from inet_sk(sk)->inet_flags, 270 * this could change in the future. 271 */ 272 #define inet6_test_bit(nr, sk) \ 273 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 274 #define inet6_set_bit(nr, sk) \ 275 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 276 #define inet6_clear_bit(nr, sk) \ 277 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 278 #define inet6_assign_bit(nr, sk, val) \ 279 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val) 280 281 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 282 struct raw6_sock { 283 /* inet_sock has to be the first member of raw6_sock */ 284 struct inet_sock inet; 285 __u32 checksum; /* perform checksum */ 286 __u32 offset; /* checksum offset */ 287 struct icmp6_filter filter; 288 __u32 ip6mr_table; 289 290 struct ipv6_pinfo inet6; 291 }; 292 293 struct udp6_sock { 294 struct udp_sock udp; 295 296 struct ipv6_pinfo inet6; 297 }; 298 299 struct tcp6_sock { 300 struct tcp_sock tcp; 301 302 struct ipv6_pinfo inet6; 303 }; 304 305 extern int inet6_sk_rebuild_header(struct sock *sk); 306 307 struct tcp6_timewait_sock { 308 struct tcp_timewait_sock tcp6tw_tcp; 309 }; 310 311 #if IS_ENABLED(CONFIG_IPV6) 312 bool ipv6_mod_enabled(void); 313 314 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 315 { 316 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 317 } 318 319 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk) 320 321 #define ipv6_only_sock(sk) (sk->sk_ipv6only) 322 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 323 inet6_sk(sk)->rxopt.bits.rxinfo) 324 325 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 326 { 327 if (sk->sk_family == AF_INET6) 328 return &sk->sk_v6_rcv_saddr; 329 return NULL; 330 } 331 332 static inline int inet_v6_ipv6only(const struct sock *sk) 333 { 334 /* ipv6only field is at same position for timewait and other sockets */ 335 return ipv6_only_sock(sk); 336 } 337 #else 338 #define ipv6_only_sock(sk) 0 339 #define ipv6_sk_rxinfo(sk) 0 340 341 static inline bool ipv6_mod_enabled(void) 342 { 343 return false; 344 } 345 346 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 347 { 348 return NULL; 349 } 350 351 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 352 { 353 return NULL; 354 } 355 356 #define inet6_rcv_saddr(__sk) NULL 357 #define inet_v6_ipv6only(__sk) 0 358 #endif /* IS_ENABLED(CONFIG_IPV6) */ 359 #endif /* _IPV6_H */ 360