1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _IPV6_H 3 #define _IPV6_H 4 5 #include <uapi/linux/ipv6.h> 6 #include <linux/cache.h> 7 8 #define ipv6_optlen(p) (((p)->hdrlen+1) << 3) 9 #define ipv6_authlen(p) (((p)->hdrlen+2) << 2) 10 /* 11 * This structure contains configuration options per IPv6 link. 12 */ 13 struct ipv6_devconf { 14 /* RX & TX fastpath fields. */ 15 __cacheline_group_begin(ipv6_devconf_read_txrx); 16 __s32 disable_ipv6; 17 __s32 hop_limit; 18 __s32 mtu6; 19 __s32 forwarding; 20 __s32 disable_policy; 21 __s32 proxy_ndp; 22 __cacheline_group_end(ipv6_devconf_read_txrx); 23 24 __s32 accept_ra; 25 __s32 accept_redirects; 26 __s32 autoconf; 27 __s32 dad_transmits; 28 __s32 rtr_solicits; 29 __s32 rtr_solicit_interval; 30 __s32 rtr_solicit_max_interval; 31 __s32 rtr_solicit_delay; 32 __s32 force_mld_version; 33 __s32 mldv1_unsolicited_report_interval; 34 __s32 mldv2_unsolicited_report_interval; 35 __s32 use_tempaddr; 36 __s32 temp_valid_lft; 37 __s32 temp_prefered_lft; 38 __s32 regen_min_advance; 39 __s32 regen_max_retry; 40 __s32 max_desync_factor; 41 __s32 max_addresses; 42 __s32 accept_ra_defrtr; 43 __u32 ra_defrtr_metric; 44 __s32 accept_ra_min_hop_limit; 45 __s32 accept_ra_min_lft; 46 __s32 accept_ra_pinfo; 47 __s32 ignore_routes_with_linkdown; 48 #ifdef CONFIG_IPV6_ROUTER_PREF 49 __s32 accept_ra_rtr_pref; 50 __s32 rtr_probe_interval; 51 #ifdef CONFIG_IPV6_ROUTE_INFO 52 __s32 accept_ra_rt_info_min_plen; 53 __s32 accept_ra_rt_info_max_plen; 54 #endif 55 #endif 56 __s32 accept_source_route; 57 __s32 accept_ra_from_local; 58 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 59 __s32 optimistic_dad; 60 __s32 use_optimistic; 61 #endif 62 #ifdef CONFIG_IPV6_MROUTE 63 atomic_t mc_forwarding; 64 #endif 65 __s32 drop_unicast_in_l2_multicast; 66 __s32 accept_dad; 67 __s32 force_tllao; 68 __s32 ndisc_notify; 69 __s32 suppress_frag_ndisc; 70 __s32 accept_ra_mtu; 71 __s32 drop_unsolicited_na; 72 __s32 accept_untracked_na; 73 struct ipv6_stable_secret { 74 bool initialized; 75 struct in6_addr secret; 76 } stable_secret; 77 __s32 use_oif_addrs_only; 78 __s32 keep_addr_on_down; 79 __s32 seg6_enabled; 80 #ifdef CONFIG_IPV6_SEG6_HMAC 81 __s32 seg6_require_hmac; 82 #endif 83 __u32 enhanced_dad; 84 __u32 addr_gen_mode; 85 __s32 ndisc_tclass; 86 __s32 rpl_seg_enabled; 87 __u32 ioam6_id; 88 __u32 ioam6_id_wide; 89 __u8 ioam6_enabled; 90 __u8 ndisc_evict_nocarrier; 91 __u8 ra_honor_pio_life; 92 __u8 ra_honor_pio_pflag; 93 94 struct ctl_table_header *sysctl_header; 95 }; 96 97 struct ipv6_params { 98 __s32 disable_ipv6; 99 __s32 autoconf; 100 }; 101 extern struct ipv6_params ipv6_defaults; 102 #include <linux/tcp.h> 103 #include <linux/udp.h> 104 105 #include <net/inet_sock.h> 106 107 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 108 { 109 return (struct ipv6hdr *)skb_network_header(skb); 110 } 111 112 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 113 { 114 return (struct ipv6hdr *)skb_inner_network_header(skb); 115 } 116 117 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 118 { 119 return (struct ipv6hdr *)skb_transport_header(skb); 120 } 121 122 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb) 123 { 124 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) - 125 skb_network_header_len(skb); 126 } 127 128 /* 129 This structure contains results of exthdrs parsing 130 as offsets from skb->nh. 131 */ 132 133 struct inet6_skb_parm { 134 int iif; 135 __be16 ra; 136 __u16 dst0; 137 __u16 srcrt; 138 __u16 dst1; 139 __u16 lastopt; 140 __u16 nhoff; 141 __u16 flags; 142 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 143 __u16 dsthao; 144 #endif 145 __u16 frag_max_size; 146 __u16 srhoff; 147 148 #define IP6SKB_XFRM_TRANSFORMED 1 149 #define IP6SKB_FORWARDED 2 150 #define IP6SKB_REROUTED 4 151 #define IP6SKB_ROUTERALERT 8 152 #define IP6SKB_FRAGMENTED 16 153 #define IP6SKB_HOPBYHOP 32 154 #define IP6SKB_L3SLAVE 64 155 #define IP6SKB_JUMBOGRAM 128 156 #define IP6SKB_SEG6 256 157 #define IP6SKB_FAKEJUMBO 512 158 #define IP6SKB_MULTIPATH 1024 159 }; 160 161 #if defined(CONFIG_NET_L3_MASTER_DEV) 162 static inline bool ipv6_l3mdev_skb(__u16 flags) 163 { 164 return flags & IP6SKB_L3SLAVE; 165 } 166 #else 167 static inline bool ipv6_l3mdev_skb(__u16 flags) 168 { 169 return false; 170 } 171 #endif 172 173 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 174 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 175 176 static inline int inet6_iif(const struct sk_buff *skb) 177 { 178 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 179 180 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 181 } 182 183 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 184 { 185 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 186 } 187 188 /* can not be used in TCP layer after tcp_v6_fill_cb */ 189 static inline int inet6_sdif(const struct sk_buff *skb) 190 { 191 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 192 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 193 return IP6CB(skb)->iif; 194 #endif 195 return 0; 196 } 197 198 struct tcp6_request_sock { 199 struct tcp_request_sock tcp6rsk_tcp; 200 }; 201 202 struct ipv6_mc_socklist; 203 struct ipv6_ac_socklist; 204 struct ipv6_fl_socklist; 205 206 struct inet6_cork { 207 struct ipv6_txoptions *opt; 208 u8 hop_limit; 209 u8 tclass; 210 u8 dontfrag:1; 211 }; 212 213 /* struct ipv6_pinfo - ipv6 private area */ 214 struct ipv6_pinfo { 215 struct in6_addr saddr; 216 struct in6_pktinfo sticky_pktinfo; 217 const struct in6_addr *daddr_cache; 218 #ifdef CONFIG_IPV6_SUBTREES 219 const struct in6_addr *saddr_cache; 220 #endif 221 222 __be32 flow_label; 223 __u32 frag_size; 224 225 s16 hop_limit; 226 u8 mcast_hops; 227 228 int ucast_oif; 229 int mcast_oif; 230 231 /* pktoption flags */ 232 union { 233 struct { 234 __u16 srcrt:1, 235 osrcrt:1, 236 rxinfo:1, 237 rxoinfo:1, 238 rxhlim:1, 239 rxohlim:1, 240 hopopts:1, 241 ohopopts:1, 242 dstopts:1, 243 odstopts:1, 244 rxflow:1, 245 rxtclass:1, 246 rxpmtu:1, 247 rxorigdstaddr:1, 248 recvfragsize:1; 249 /* 1 bits hole */ 250 } bits; 251 __u16 all; 252 } rxopt; 253 254 /* sockopt flags */ 255 __u8 srcprefs; /* 001: prefer temporary address 256 * 010: prefer public address 257 * 100: prefer care-of address 258 */ 259 __u8 pmtudisc; 260 __u8 min_hopcount; 261 __u8 tclass; 262 __be32 rcv_flowinfo; 263 264 __u32 dst_cookie; 265 266 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 267 struct ipv6_ac_socklist *ipv6_ac_list; 268 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 269 270 struct ipv6_txoptions __rcu *opt; 271 struct sk_buff *pktoptions; 272 struct sk_buff *rxpmtu; 273 struct inet6_cork cork; 274 }; 275 276 /* We currently use available bits from inet_sk(sk)->inet_flags, 277 * this could change in the future. 278 */ 279 #define inet6_test_bit(nr, sk) \ 280 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 281 #define inet6_set_bit(nr, sk) \ 282 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 283 #define inet6_clear_bit(nr, sk) \ 284 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 285 #define inet6_assign_bit(nr, sk, val) \ 286 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val) 287 288 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 289 struct raw6_sock { 290 /* inet_sock has to be the first member of raw6_sock */ 291 struct inet_sock inet; 292 __u32 checksum; /* perform checksum */ 293 __u32 offset; /* checksum offset */ 294 struct icmp6_filter filter; 295 __u32 ip6mr_table; 296 297 struct ipv6_pinfo inet6; 298 }; 299 300 struct udp6_sock { 301 struct udp_sock udp; 302 303 struct ipv6_pinfo inet6; 304 }; 305 306 struct tcp6_sock { 307 struct tcp_sock tcp; 308 309 struct ipv6_pinfo inet6; 310 }; 311 312 extern int inet6_sk_rebuild_header(struct sock *sk); 313 314 struct tcp6_timewait_sock { 315 struct tcp_timewait_sock tcp6tw_tcp; 316 }; 317 318 #if IS_ENABLED(CONFIG_IPV6) 319 bool ipv6_mod_enabled(void); 320 321 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 322 { 323 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 324 } 325 326 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk) 327 328 #define ipv6_only_sock(sk) (sk->sk_ipv6only) 329 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 330 inet6_sk(sk)->rxopt.bits.rxinfo) 331 332 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 333 { 334 if (sk->sk_family == AF_INET6) 335 return &sk->sk_v6_rcv_saddr; 336 return NULL; 337 } 338 339 static inline int inet_v6_ipv6only(const struct sock *sk) 340 { 341 /* ipv6only field is at same position for timewait and other sockets */ 342 return ipv6_only_sock(sk); 343 } 344 #else 345 #define ipv6_only_sock(sk) 0 346 #define ipv6_sk_rxinfo(sk) 0 347 348 static inline bool ipv6_mod_enabled(void) 349 { 350 return false; 351 } 352 353 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 354 { 355 return NULL; 356 } 357 358 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 359 { 360 return NULL; 361 } 362 363 #define inet6_rcv_saddr(__sk) NULL 364 #define inet_v6_ipv6only(__sk) 0 365 #endif /* IS_ENABLED(CONFIG_IPV6) */ 366 #endif /* _IPV6_H */ 367