include/linux/ipv6.h

   1 #ifndef _IPV6_H
   2 #define _IPV6_H
   3
   4 #include <uapi/linux/ipv6.h>
   5
   6 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
   7 /*
   8  * This structure contains configuration options per IPv6 link.
   9  */
  10 struct ipv6_devconf {
  11         __s32           forwarding;
  12         __s32           hop_limit;
  13         __s32           mtu6;
  14         __s32           accept_ra;
  15         __s32           accept_redirects;
  16         __s32           autoconf;
  17         __s32           dad_transmits;
  18         __s32           rtr_solicits;
  19         __s32           rtr_solicit_interval;
  20         __s32           rtr_solicit_delay;
  21         __s32           force_mld_version;
  22         __s32           mldv1_unsolicited_report_interval;
  23         __s32           mldv2_unsolicited_report_interval;
  24 #ifdef CONFIG_IPV6_PRIVACY
  25         __s32           use_tempaddr;
  26         __s32           temp_valid_lft;
  27         __s32           temp_prefered_lft;
  28         __s32           regen_max_retry;
  29         __s32           max_desync_factor;
  30 #endif
  31         __s32           max_addresses;
  32         __s32           accept_ra_defrtr;
  33         __s32           accept_ra_pinfo;
  34 #ifdef CONFIG_IPV6_ROUTER_PREF
  35         __s32           accept_ra_rtr_pref;
  36         __s32           rtr_probe_interval;
  37 #ifdef CONFIG_IPV6_ROUTE_INFO
  38         __s32           accept_ra_rt_info_max_plen;
  39 #endif
  40 #endif
  41         __s32           proxy_ndp;
  42         __s32           accept_source_route;
  43 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  44         __s32           optimistic_dad;
  45 #endif
  46 #ifdef CONFIG_IPV6_MROUTE
  47         __s32           mc_forwarding;
  48 #endif
  49         __s32           disable_ipv6;
  50         __s32           accept_dad;
  51         __s32           force_tllao;
  52         __s32           ndisc_notify;
  53         void            *sysctl;
  54 };
  55
  56 struct ipv6_params {
  57         __s32 disable_ipv6;
  58         __s32 autoconf;
  59 };
  60 extern struct ipv6_params ipv6_defaults;
  61 #include <linux/icmpv6.h>
  62 #include <linux/tcp.h>
  63 #include <linux/udp.h>
  64
  65 #include <net/inet_sock.h>
  66
  67 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  68 {
  69         return (struct ipv6hdr *)skb_network_header(skb);
  70 }
  71
  72 static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  73 {
  74         return (struct ipv6hdr *)skb_inner_network_header(skb);
  75 }
  76
  77 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  78 {
  79         return (struct ipv6hdr *)skb_transport_header(skb);
  80 }
  81
  82 /*
  83    This structure contains results of exthdrs parsing
  84    as offsets from skb->nh.
  85  */
  86
  87 struct inet6_skb_parm {
  88         int                     iif;
  89         __be16                  ra;
  90         __u16                   hop;
  91         __u16                   dst0;
  92         __u16                   srcrt;
  93         __u16                   dst1;
  94         __u16                   lastopt;
  95         __u16                   nhoff;
  96         __u16                   flags;
  97 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  98         __u16                   dsthao;
  99 #endif
 100         __u16                   frag_max_size;
 101
 102 #define IP6SKB_XFRM_TRANSFORMED 1
 103 #define IP6SKB_FORWARDED        2
 104 #define IP6SKB_REROUTED         4
 105 #define IP6SKB_ROUTERALERT      8
 106 };
 107
 108 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 109 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 110
 111 static inline int inet6_iif(const struct sk_buff *skb)
 112 {
 113         return IP6CB(skb)->iif;
 114 }
 115
 116 struct inet6_request_sock {
 117         struct in6_addr         loc_addr;
 118         struct in6_addr         rmt_addr;
 119         struct sk_buff          *pktopts;
 120         int                     iif;
 121 };
 122
 123 struct tcp6_request_sock {
 124         struct tcp_request_sock   tcp6rsk_tcp;
 125         struct inet6_request_sock tcp6rsk_inet6;
 126 };
 127
 128 struct ipv6_mc_socklist;
 129 struct ipv6_ac_socklist;
 130 struct ipv6_fl_socklist;
 131
 132 /**
 133  * struct ipv6_pinfo - ipv6 private area
 134  *
 135  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 136  * this _must_ be the last member, so that inet6_sk_generic
 137  * is able to calculate its offset from the base struct sock
 138  * by using the struct proto->slab_obj_size member. -acme
 139  */
 140 struct ipv6_pinfo {
 141         struct in6_addr         saddr;
 142         struct in6_addr         rcv_saddr;
 143         struct in6_addr         daddr;
 144         struct in6_pktinfo      sticky_pktinfo;
 145         const struct in6_addr           *daddr_cache;
 146 #ifdef CONFIG_IPV6_SUBTREES
 147         const struct in6_addr           *saddr_cache;
 148 #endif
 149
 150         __be32                  flow_label;
 151         __u32                   frag_size;
 152
 153         /*
 154          * Packed in 16bits.
 155          * Omit one shift by by putting the signed field at MSB.
 156          */
 157 #if defined(__BIG_ENDIAN_BITFIELD)
 158         __s16                   hop_limit:9;
 159         __u16                   __unused_1:7;
 160 #else
 161         __u16                   __unused_1:7;
 162         __s16                   hop_limit:9;
 163 #endif
 164
 165 #if defined(__BIG_ENDIAN_BITFIELD)
 166         /* Packed in 16bits. */
 167         __s16                   mcast_hops:9;
 168         __u16                   __unused_2:6,
 169                                 mc_loop:1;
 170 #else
 171         __u16                   mc_loop:1,
 172                                 __unused_2:6;
 173         __s16                   mcast_hops:9;
 174 #endif
 175         int                     ucast_oif;
 176         int                     mcast_oif;
 177
 178         /* pktoption flags */
 179         union {
 180                 struct {
 181                         __u16   srcrt:1,
 182                                 osrcrt:1,
 183                                 rxinfo:1,
 184                                 rxoinfo:1,
 185                                 rxhlim:1,
 186                                 rxohlim:1,
 187                                 hopopts:1,
 188                                 ohopopts:1,
 189                                 dstopts:1,
 190                                 odstopts:1,
 191                                 rxflow:1,
 192                                 rxtclass:1,
 193                                 rxpmtu:1,
 194                                 rxorigdstaddr:1;
 195                                 /* 2 bits hole */
 196                 } bits;
 197                 __u16           all;
 198         } rxopt;
 199
 200         /* sockopt flags */
 201         __u16                   recverr:1,
 202                                 sndflow:1,
 203                                 pmtudisc:2,
 204                                 ipv6only:1,
 205                                 srcprefs:3,     /* 001: prefer temporary address
 206                                                  * 010: prefer public address
 207                                                  * 100: prefer care-of address
 208                                                  */
 209                                 dontfrag:1;
 210         __u8                    min_hopcount;
 211         __u8                    tclass;
 212         __u8                    rcv_tclass;
 213
 214         __u32                   dst_cookie;
 215         __u32                   rx_dst_cookie;
 216
 217         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 218         struct ipv6_ac_socklist *ipv6_ac_list;
 219         struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 220
 221         struct ipv6_txoptions   *opt;
 222         struct sk_buff          *pktoptions;
 223         struct sk_buff          *rxpmtu;
 224         struct {
 225                 struct ipv6_txoptions *opt;
 226                 u8 hop_limit;
 227                 u8 tclass;
 228         } cork;
 229 };
 230
 231 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 232 struct raw6_sock {
 233         /* inet_sock has to be the first member of raw6_sock */
 234         struct inet_sock        inet;
 235         __u32                   checksum;       /* perform checksum */
 236         __u32                   offset;         /* checksum offset  */
 237         struct icmp6_filter     filter;
 238         __u32                   ip6mr_table;
 239         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 240         struct ipv6_pinfo       inet6;
 241 };
 242
 243 struct udp6_sock {
 244         struct udp_sock   udp;
 245         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 246         struct ipv6_pinfo inet6;
 247 };
 248
 249 struct tcp6_sock {
 250         struct tcp_sock   tcp;
 251         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 252         struct ipv6_pinfo inet6;
 253 };
 254
 255 extern int inet6_sk_rebuild_header(struct sock *sk);
 256
 257 struct inet6_timewait_sock {
 258         struct in6_addr tw_v6_daddr;
 259         struct in6_addr tw_v6_rcv_saddr;
 260 };
 261
 262 struct tcp6_timewait_sock {
 263         struct tcp_timewait_sock   tcp6tw_tcp;
 264         struct inet6_timewait_sock tcp6tw_inet6;
 265 };
 266
 267 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 268 {
 269         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 270                                               inet_twsk(sk)->tw_ipv6_offset);
 271 }
 272
 273 #if IS_ENABLED(CONFIG_IPV6)
 274 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 275 {
 276         return inet_sk(__sk)->pinet6;
 277 }
 278
 279 static inline struct inet6_request_sock *
 280                         inet6_rsk(const struct request_sock *rsk)
 281 {
 282         return (struct inet6_request_sock *)(((u8 *)rsk) +
 283                                              inet_rsk(rsk)->inet6_rsk_offset);
 284 }
 285
 286 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 287 {
 288         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 289 }
 290
 291 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 292 {
 293         struct request_sock *req = reqsk_alloc(ops);
 294
 295         if (req != NULL) {
 296                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 297                 inet6_rsk(req)->pktopts = NULL;
 298         }
 299
 300         return req;
 301 }
 302
 303 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 304 {
 305         return (struct raw6_sock *)sk;
 306 }
 307
 308 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 309                                            const struct sock *sk_from)
 310 {
 311         int ancestor_size = sizeof(struct inet_sock);
 312
 313         if (sk_from->sk_family == PF_INET6)
 314                 ancestor_size += sizeof(struct ipv6_pinfo);
 315
 316         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 317 }
 318
 319 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 320 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 321
 322 static inline u16 inet6_tw_offset(const struct proto *prot)
 323 {
 324         return prot->twsk_prot->twsk_obj_size -
 325                         sizeof(struct inet6_timewait_sock);
 326 }
 327
 328 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 329 {
 330         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 331                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 332 }
 333
 334 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 335 {
 336         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 337 }
 338
 339 static inline int inet_v6_ipv6only(const struct sock *sk)
 340 {
 341         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 342                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 343 }
 344 #else
 345 #define __ipv6_only_sock(sk)    0
 346 #define ipv6_only_sock(sk)      0
 347
 348 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 349 {
 350         return NULL;
 351 }
 352
 353 static inline struct inet6_request_sock *
 354                         inet6_rsk(const struct request_sock *rsk)
 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 inet6_rcv_saddr(__sk)   NULL
 366 #define tcp_twsk_ipv6only(__sk)         0
 367 #define inet_v6_ipv6only(__sk)          0
 368 #endif /* IS_ENABLED(CONFIG_IPV6) */
 369
 370 #define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 371         ((inet_sk(__sk)->inet_portpair == (__ports))            &&      \
 372          ((__sk)->sk_family == AF_INET6)                        &&      \
 373          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     &&      \
 374          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) &&      \
 375          (!(__sk)->sk_bound_dev_if      ||                              \
 376            ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 377          net_eq(sock_net(__sk), (__net)))
 378
 379 #define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 380         ((inet_twsk(__sk)->tw_portpair == (__ports))                    && \
 381          ((__sk)->sk_family == AF_INET6)                                && \
 382          ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))     && \
 383          ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \
 384          (!(__sk)->sk_bound_dev_if      ||                                 \
 385           ((__sk)->sk_bound_dev_if == (__dif)))                         && \
 386          net_eq(sock_net(__sk), (__net)))
 387
 388 #endif /* _IPV6_H */