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 ipv6_hdr(const struct sk_buff * skb)107 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) 108 { 109 return (struct ipv6hdr *)skb_network_header(skb); 110 } 111 inner_ipv6_hdr(const struct sk_buff * skb)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 ipipv6_hdr(const struct sk_buff * skb)117 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 118 { 119 return (struct ipv6hdr *)skb_transport_header(skb); 120 } 121 ipv6_transport_len(const struct sk_buff * skb)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) ipv6_l3mdev_skb(__u16 flags)162 static inline bool ipv6_l3mdev_skb(__u16 flags) 163 { 164 return flags & IP6SKB_L3SLAVE; 165 } 166 #else ipv6_l3mdev_skb(__u16 flags)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 inet6_iif(const struct sk_buff * skb)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 inet6_is_jumbogram(const struct sk_buff * skb)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 */ inet6_sdif(const struct sk_buff * skb)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 }; 211 212 /* struct ipv6_pinfo - ipv6 private area */ 213 struct ipv6_pinfo { 214 struct in6_addr saddr; 215 struct in6_pktinfo sticky_pktinfo; 216 const struct in6_addr *daddr_cache; 217 #ifdef CONFIG_IPV6_SUBTREES 218 const struct in6_addr *saddr_cache; 219 #endif 220 221 __be32 flow_label; 222 __u32 frag_size; 223 224 s16 hop_limit; 225 u8 mcast_hops; 226 227 int ucast_oif; 228 int mcast_oif; 229 230 /* pktoption flags */ 231 union { 232 struct { 233 __u16 srcrt:1, 234 osrcrt:1, 235 rxinfo:1, 236 rxoinfo:1, 237 rxhlim:1, 238 rxohlim:1, 239 hopopts:1, 240 ohopopts:1, 241 dstopts:1, 242 odstopts:1, 243 rxflow:1, 244 rxtclass:1, 245 rxpmtu:1, 246 rxorigdstaddr:1, 247 recvfragsize:1; 248 /* 1 bits hole */ 249 } bits; 250 __u16 all; 251 } rxopt; 252 253 /* sockopt flags */ 254 __u8 srcprefs; /* 001: prefer temporary address 255 * 010: prefer public address 256 * 100: prefer care-of address 257 */ 258 __u8 pmtudisc; 259 __u8 min_hopcount; 260 __u8 tclass; 261 __be32 rcv_flowinfo; 262 263 __u32 dst_cookie; 264 265 struct ipv6_mc_socklist __rcu *ipv6_mc_list; 266 struct ipv6_ac_socklist *ipv6_ac_list; 267 struct ipv6_fl_socklist __rcu *ipv6_fl_list; 268 269 struct ipv6_txoptions __rcu *opt; 270 struct sk_buff *pktoptions; 271 struct sk_buff *rxpmtu; 272 struct inet6_cork cork; 273 }; 274 275 /* We currently use available bits from inet_sk(sk)->inet_flags, 276 * this could change in the future. 277 */ 278 #define inet6_test_bit(nr, sk) \ 279 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 280 #define inet6_set_bit(nr, sk) \ 281 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 282 #define inet6_clear_bit(nr, sk) \ 283 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags) 284 #define inet6_assign_bit(nr, sk, val) \ 285 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val) 286 287 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */ 288 struct raw6_sock { 289 /* inet_sock has to be the first member of raw6_sock */ 290 struct inet_sock inet; 291 __u32 checksum; /* perform checksum */ 292 __u32 offset; /* checksum offset */ 293 struct icmp6_filter filter; 294 __u32 ip6mr_table; 295 296 struct ipv6_pinfo inet6; 297 }; 298 299 struct udp6_sock { 300 struct udp_sock udp; 301 302 struct ipv6_pinfo inet6; 303 }; 304 305 struct tcp6_sock { 306 struct tcp_sock tcp; 307 308 struct ipv6_pinfo inet6; 309 }; 310 311 extern int inet6_sk_rebuild_header(struct sock *sk); 312 313 struct tcp6_timewait_sock { 314 struct tcp_timewait_sock tcp6tw_tcp; 315 }; 316 317 #if IS_ENABLED(CONFIG_IPV6) 318 bool ipv6_mod_enabled(void); 319 inet6_sk(const struct sock * __sk)320 static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk) 321 { 322 return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL; 323 } 324 325 #define raw6_sk(ptr) container_of_const(ptr, struct raw6_sock, inet.sk) 326 327 #define ipv6_only_sock(sk) (sk->sk_ipv6only) 328 #define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \ 329 inet6_sk(sk)->rxopt.bits.rxinfo) 330 inet6_rcv_saddr(const struct sock * sk)331 static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk) 332 { 333 if (sk->sk_family == AF_INET6) 334 return &sk->sk_v6_rcv_saddr; 335 return NULL; 336 } 337 inet_v6_ipv6only(const struct sock * sk)338 static inline int inet_v6_ipv6only(const struct sock *sk) 339 { 340 /* ipv6only field is at same position for timewait and other sockets */ 341 return ipv6_only_sock(sk); 342 } 343 #else 344 #define ipv6_only_sock(sk) 0 345 #define ipv6_sk_rxinfo(sk) 0 346 ipv6_mod_enabled(void)347 static inline bool ipv6_mod_enabled(void) 348 { 349 return false; 350 } 351 inet6_sk(const struct sock * __sk)352 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk) 353 { 354 return NULL; 355 } 356 raw6_sk(const struct sock * sk)357 static inline struct raw6_sock *raw6_sk(const struct sock *sk) 358 { 359 return NULL; 360 } 361 362 #define inet6_rcv_saddr(__sk) NULL 363 #define inet_v6_ipv6only(__sk) 0 364 #endif /* IS_ENABLED(CONFIG_IPV6) */ 365 #endif /* _IPV6_H */ 366