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 #define IP6SKB_MULTIPATH 1024 151 }; 152 153 #if defined(CONFIG_NET_L3_MASTER_DEV) 154 static inline bool ipv6_l3mdev_skb(__u16 flags) 155 { 156 return flags & IP6SKB_L3SLAVE; 157 } 158 #else 159 static inline bool ipv6_l3mdev_skb(__u16 flags) 160 { 161 return false; 162 } 163 #endif 164 165 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 166 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 167 168 static inline int inet6_iif(const struct sk_buff *skb) 169 { 170 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 171 172 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 173 } 174 175 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 176 { 177 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 178 } 179 180 /* can not be used in TCP layer after tcp_v6_fill_cb */ 181 static inline int inet6_sdif(const struct sk_buff *skb) 182 { 183 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 184 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 185 return IP6CB(skb)->iif; 186 #endif 187 return 0; 188 } 189 190 struct tcp6_request_sock { 191 struct tcp_request_sock tcp6rsk_tcp; 192 }; 193 194 struct ipv6_mc_socklist; 195 struct ipv6_ac_socklist; 196 struct ipv6_fl_socklist; 197 198 struct inet6_cork { 199 struct ipv6_txoptions *opt; 200 u8 hop_limit; 201 u8 tclass; 202 }; 203 204 /* struct ipv6_pinfo - ipv6 private area */ 205 struct ipv6_pinfo { 206 struct in6_addr saddr; 207 struct in6_pktinfo sticky_pktinfo; 208 const struct in6_addr *daddr_cache; 209 #ifdef CONFIG_IPV6_SUBTREES 210 const struct in6_addr *saddr_cache; 211 #endif 212 213 __be32 flow_label; 214 __u32 frag_size; 215 216 s16 hop_limit; 217 u8 mcast_hops; 218 219 int ucast_oif; 220 int mcast_oif; 221 222 /* pktoption flags */ 223 union { 224 struct { 225 __u16 srcrt:1, 226 osrcrt:1, 227 rxinfo:1, 228 rxoinfo:1, 229 rxhlim:1, 230 rxohlim:1, 231 hopopts:1, 232 ohopopts:1, 233 dstopts:1, 234 odstopts:1, 235 rxflow:1, 236 rxtclass:1, 237 rxpmtu:1, 238 rxorigdstaddr:1, 239 recvfragsize:1; 240 /* 1 bits hole */ 241 } bits; 242 __u16 all; 243 } rxopt; 244 245 /* sockopt flags */ 246 __u16 sndflow:1, 247 pmtudisc:3, 248 padding:1, /* 1 bit hole */ 249 srcprefs:3, /* 001: prefer temporary address 250 * 010: prefer public address 251 * 100: prefer care-of address 252 */ 253 rtalert_isolate:1; 254 __u8 min_hopcount; 255 __u8 tclass; 256 __be32 rcv_flowinfo; 257 258 __u32 dst_cookie; 259 260 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 261 struct ipv6_ac_socklist *ipv6_ac_list; 262 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 263 264 struct ipv6_txoptions __rcu *opt; 265 struct sk_buff *pktoptions; 266 struct sk_buff *rxpmtu; 267 struct inet6_cork cork; 268 }; 269 270 /* We currently use available bits from inet_sk(sk)->inet_flags, 271 * this could change in the future. 272 */ 273 #define inet6_test_bit(nr, sk) \ 274 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 275 #define inet6_set_bit(nr, sk) \ 276 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 277 #define inet6_clear_bit(nr, sk) \ 278 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 279 #define inet6_assign_bit(nr, sk, val) \ 280 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val) 281 282 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 283 struct raw6_sock { 284 /* inet_sock has to be the first member of raw6_sock */ 285 struct inet_sock inet; 286 __u32 checksum; /* perform checksum */ 287 __u32 offset; /* checksum offset */ 288 struct icmp6_filter filter; 289 __u32 ip6mr_table; 290 291 struct ipv6_pinfo inet6; 292 }; 293 294 struct udp6_sock { 295 struct udp_sock udp; 296 297 struct ipv6_pinfo inet6; 298 }; 299 300 struct tcp6_sock { 301 struct tcp_sock tcp; 302 303 struct ipv6_pinfo inet6; 304 }; 305 306 extern int inet6_sk_rebuild_header(struct sock *sk); 307 308 struct tcp6_timewait_sock { 309 struct tcp_timewait_sock tcp6tw_tcp; 310 }; 311 312 #if IS_ENABLED(CONFIG_IPV6) 313 bool ipv6_mod_enabled(void); 314 315 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 316 { 317 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 318 } 319 320 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk) 321 322 #define ipv6_only_sock(sk) (sk->sk_ipv6only) 323 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 324 inet6_sk(sk)->rxopt.bits.rxinfo) 325 326 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 327 { 328 if (sk->sk_family == AF_INET6) 329 return &sk->sk_v6_rcv_saddr; 330 return NULL; 331 } 332 333 static inline int inet_v6_ipv6only(const struct sock *sk) 334 { 335 /* ipv6only field is at same position for timewait and other sockets */ 336 return ipv6_only_sock(sk); 337 } 338 #else 339 #define ipv6_only_sock(sk) 0 340 #define ipv6_sk_rxinfo(sk) 0 341 342 static inline bool ipv6_mod_enabled(void) 343 { 344 return false; 345 } 346 347 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 348 { 349 return NULL; 350 } 351 352 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 353 { 354 return NULL; 355 } 356 357 #define inet6_rcv_saddr(__sk) NULL 358 #define inet_v6_ipv6only(__sk) 0 359 #endif /* IS_ENABLED(CONFIG_IPV6) */ 360 #endif /* _IPV6_H */ 361