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 force_forwarding; 21 __s32 disable_policy; 22 __s32 proxy_ndp; 23 __cacheline_group_end(ipv6_devconf_read_txrx); 24 25 __s32 accept_ra; 26 __s32 accept_redirects; 27 __s32 autoconf; 28 __s32 dad_transmits; 29 __s32 rtr_solicits; 30 __s32 rtr_solicit_interval; 31 __s32 rtr_solicit_max_interval; 32 __s32 rtr_solicit_delay; 33 __s32 force_mld_version; 34 __s32 mldv1_unsolicited_report_interval; 35 __s32 mldv2_unsolicited_report_interval; 36 __s32 use_tempaddr; 37 __s32 temp_valid_lft; 38 __s32 temp_prefered_lft; 39 __s32 regen_min_advance; 40 __s32 regen_max_retry; 41 __s32 max_desync_factor; 42 __s32 max_addresses; 43 __s32 accept_ra_defrtr; 44 __u32 ra_defrtr_metric; 45 __s32 accept_ra_min_hop_limit; 46 __s32 accept_ra_min_lft; 47 __s32 accept_ra_pinfo; 48 __s32 ignore_routes_with_linkdown; 49 #ifdef CONFIG_IPV6_ROUTER_PREF 50 __s32 accept_ra_rtr_pref; 51 __s32 rtr_probe_interval; 52 #ifdef CONFIG_IPV6_ROUTE_INFO 53 __s32 accept_ra_rt_info_min_plen; 54 __s32 accept_ra_rt_info_max_plen; 55 #endif 56 #endif 57 __s32 accept_source_route; 58 __s32 accept_ra_from_local; 59 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 60 __s32 optimistic_dad; 61 __s32 use_optimistic; 62 #endif 63 #ifdef CONFIG_IPV6_MROUTE 64 atomic_t mc_forwarding; 65 #endif 66 __s32 drop_unicast_in_l2_multicast; 67 __s32 accept_dad; 68 __s32 force_tllao; 69 __s32 ndisc_notify; 70 __s32 suppress_frag_ndisc; 71 __s32 accept_ra_mtu; 72 __s32 drop_unsolicited_na; 73 __s32 accept_untracked_na; 74 struct ipv6_stable_secret { 75 bool initialized; 76 struct in6_addr secret; 77 } stable_secret; 78 __s32 use_oif_addrs_only; 79 __s32 keep_addr_on_down; 80 __s32 seg6_enabled; 81 #ifdef CONFIG_IPV6_SEG6_HMAC 82 __s32 seg6_require_hmac; 83 #endif 84 __u32 enhanced_dad; 85 __u32 addr_gen_mode; 86 __s32 ndisc_tclass; 87 __s32 rpl_seg_enabled; 88 __u32 ioam6_id; 89 __u32 ioam6_id_wide; 90 __u8 ioam6_enabled; 91 __u8 ndisc_evict_nocarrier; 92 __u8 ra_honor_pio_life; 93 __u8 ra_honor_pio_pflag; 94 95 struct ctl_table_header *sysctl_header; 96 }; 97 98 struct ipv6_params { 99 __s32 disable_ipv6; 100 __s32 autoconf; 101 }; 102 extern struct ipv6_params ipv6_defaults; 103 #include <linux/tcp.h> 104 #include <linux/udp.h> 105 106 #include <net/inet_sock.h> 107 108 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 109 { 110 return (struct ipv6hdr *)skb_network_header(skb); 111 } 112 113 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb) 114 { 115 return (struct ipv6hdr *)skb_inner_network_header(skb); 116 } 117 118 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 119 { 120 return (struct ipv6hdr *)skb_transport_header(skb); 121 } 122 123 static inline unsigned int ipv6_transport_len(const struct sk_buff *skb) 124 { 125 return ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr) - 126 skb_network_header_len(skb); 127 } 128 129 /* 130 This structure contains results of exthdrs parsing 131 as offsets from skb->nh. 132 */ 133 134 struct inet6_skb_parm { 135 int iif; 136 __be16 ra; 137 __u16 dst0; 138 __u16 srcrt; 139 __u16 dst1; 140 __u16 lastopt; 141 __u16 nhoff; 142 __u16 flags; 143 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 144 __u16 dsthao; 145 #endif 146 __u16 frag_max_size; 147 __u16 srhoff; 148 149 #define IP6SKB_XFRM_TRANSFORMED 1 150 #define IP6SKB_FORWARDED 2 151 #define IP6SKB_REROUTED 4 152 #define IP6SKB_ROUTERALERT 8 153 #define IP6SKB_FRAGMENTED 16 154 #define IP6SKB_HOPBYHOP 32 155 #define IP6SKB_L3SLAVE 64 156 #define IP6SKB_JUMBOGRAM 128 157 #define IP6SKB_SEG6 256 158 #define IP6SKB_FAKEJUMBO 512 159 #define IP6SKB_MULTIPATH 1024 160 #define IP6SKB_MCROUTE 2048 161 }; 162 163 #if defined(CONFIG_NET_L3_MASTER_DEV) 164 static inline bool ipv6_l3mdev_skb(__u16 flags) 165 { 166 return flags & IP6SKB_L3SLAVE; 167 } 168 #else 169 static inline bool ipv6_l3mdev_skb(__u16 flags) 170 { 171 return false; 172 } 173 #endif 174 175 #define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb)) 176 #define IP6CBMTU(skb) ((struct ip6_mtuinfo *)((skb)->cb)) 177 178 static inline int inet6_iif(const struct sk_buff *skb) 179 { 180 bool l3_slave = ipv6_l3mdev_skb(IP6CB(skb)->flags); 181 182 return l3_slave ? skb->skb_iif : IP6CB(skb)->iif; 183 } 184 185 static inline bool inet6_is_jumbogram(const struct sk_buff *skb) 186 { 187 return !!(IP6CB(skb)->flags & IP6SKB_JUMBOGRAM); 188 } 189 190 /* can not be used in TCP layer after tcp_v6_fill_cb */ 191 static inline int inet6_sdif(const struct sk_buff *skb) 192 { 193 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) 194 if (skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) 195 return IP6CB(skb)->iif; 196 #endif 197 return 0; 198 } 199 200 struct tcp6_request_sock { 201 struct tcp_request_sock tcp6rsk_tcp; 202 }; 203 204 struct ipv6_mc_socklist; 205 struct ipv6_ac_socklist; 206 struct ipv6_fl_socklist; 207 208 struct inet6_cork { 209 struct ipv6_txoptions *opt; 210 u8 hop_limit; 211 u8 tclass; 212 u8 dontfrag:1; 213 }; 214 215 /* struct ipv6_pinfo - ipv6 private area */ 216 struct ipv6_pinfo { 217 /* Used in tx path (inet6_csk_route_socket(), ip6_xmit()) */ 218 struct in6_addr saddr; 219 __be32 flow_label; 220 u32 dst_cookie; 221 struct ipv6_txoptions __rcu *opt; 222 s16 hop_limit; 223 u8 pmtudisc; 224 u8 tclass; 225 #ifdef CONFIG_IPV6_SUBTREES 226 bool saddr_cache; 227 #endif 228 bool daddr_cache; 229 230 u8 mcast_hops; 231 u32 frag_size; 232 233 int ucast_oif; 234 int mcast_oif; 235 236 /* pktoption flags */ 237 union { 238 struct { 239 u16 srcrt:1, 240 osrcrt:1, 241 rxinfo:1, 242 rxoinfo:1, 243 rxhlim:1, 244 rxohlim:1, 245 hopopts:1, 246 ohopopts:1, 247 dstopts:1, 248 odstopts:1, 249 rxflow:1, 250 rxtclass:1, 251 rxpmtu:1, 252 rxorigdstaddr:1, 253 recvfragsize:1; 254 /* 1 bits hole */ 255 } bits; 256 u16 all; 257 } rxopt; 258 259 /* sockopt flags */ 260 u8 srcprefs; /* 001: prefer temporary address 261 * 010: prefer public address 262 * 100: prefer care-of address 263 */ 264 u8 min_hopcount; 265 __be32 rcv_flowinfo; 266 struct in6_pktinfo sticky_pktinfo; 267 268 struct sk_buff *pktoptions; 269 struct sk_buff *rxpmtu; 270 struct inet6_cork cork; 271 272 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 273 struct ipv6_ac_socklist *ipv6_ac_list; 274 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 275 }; 276 277 /* We currently use available bits from inet_sk(sk)->inet_flags, 278 * this could change in the future. 279 */ 280 #define inet6_test_bit(nr, sk) \ 281 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 282 #define inet6_set_bit(nr, sk) \ 283 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 284 #define inet6_clear_bit(nr, sk) \ 285 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 286 #define inet6_assign_bit(nr, sk, val) \ 287 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val) 288 289 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 290 struct raw6_sock { 291 /* inet_sock has to be the first member of raw6_sock */ 292 struct inet_sock inet; 293 __u32 checksum; /* perform checksum */ 294 __u32 offset; /* checksum offset */ 295 struct icmp6_filter filter; 296 __u32 ip6mr_table; 297 struct numa_drop_counters drop_counters; 298 struct ipv6_pinfo inet6; 299 }; 300 301 struct udp6_sock { 302 struct udp_sock udp; 303 304 struct ipv6_pinfo inet6; 305 }; 306 307 struct tcp6_sock { 308 struct tcp_sock tcp; 309 310 struct ipv6_pinfo inet6; 311 }; 312 313 extern int inet6_sk_rebuild_header(struct sock *sk); 314 315 struct tcp6_timewait_sock { 316 struct tcp_timewait_sock tcp6tw_tcp; 317 }; 318 319 #if IS_ENABLED(CONFIG_IPV6) 320 bool ipv6_mod_enabled(void); 321 322 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 323 { 324 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 325 } 326 327 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk) 328 329 #define ipv6_only_sock(sk) (sk->sk_ipv6only) 330 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 331 inet6_sk(sk)->rxopt.bits.rxinfo) 332 333 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 334 { 335 if (sk->sk_family == AF_INET6) 336 return &sk->sk_v6_rcv_saddr; 337 return NULL; 338 } 339 340 static inline int inet_v6_ipv6only(const struct sock *sk) 341 { 342 /* ipv6only field is at same position for timewait and other sockets */ 343 return ipv6_only_sock(sk); 344 } 345 #else 346 #define ipv6_only_sock(sk) 0 347 #define ipv6_sk_rxinfo(sk) 0 348 349 static inline bool ipv6_mod_enabled(void) 350 { 351 return false; 352 } 353 354 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 355 { 356 return NULL; 357 } 358 359 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 360 { 361 return NULL; 362 } 363 364 #define inet6_rcv_saddr(__sk) NULL 365 #define inet_v6_ipv6only(__sk) 0 366 #endif /* IS_ENABLED(CONFIG_IPV6) */ 367 #endif /* _IPV6_H */ 368