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