linux/include/linux/ipv6.h
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   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 */
  10struct 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#ifdef CONFIG_IPV6_PRIVACY
  23        __s32           use_tempaddr;
  24        __s32           temp_valid_lft;
  25        __s32           temp_prefered_lft;
  26        __s32           regen_max_retry;
  27        __s32           max_desync_factor;
  28#endif
  29        __s32           max_addresses;
  30        __s32           accept_ra_defrtr;
  31        __s32           accept_ra_pinfo;
  32#ifdef CONFIG_IPV6_ROUTER_PREF
  33        __s32           accept_ra_rtr_pref;
  34        __s32           rtr_probe_interval;
  35#ifdef CONFIG_IPV6_ROUTE_INFO
  36        __s32           accept_ra_rt_info_max_plen;
  37#endif
  38#endif
  39        __s32           proxy_ndp;
  40        __s32           accept_source_route;
  41#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  42        __s32           optimistic_dad;
  43#endif
  44#ifdef CONFIG_IPV6_MROUTE
  45        __s32           mc_forwarding;
  46#endif
  47        __s32           disable_ipv6;
  48        __s32           accept_dad;
  49        __s32           force_tllao;
  50        __s32           ndisc_notify;
  51        void            *sysctl;
  52};
  53
  54struct ipv6_params {
  55        __s32 disable_ipv6;
  56        __s32 autoconf;
  57};
  58extern struct ipv6_params ipv6_defaults;
  59#include <linux/icmpv6.h>
  60#include <linux/tcp.h>
  61#include <linux/udp.h>
  62
  63#include <net/inet_sock.h>
  64
  65static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  66{
  67        return (struct ipv6hdr *)skb_network_header(skb);
  68}
  69
  70static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  71{
  72        return (struct ipv6hdr *)skb_inner_network_header(skb);
  73}
  74
  75static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  76{
  77        return (struct ipv6hdr *)skb_transport_header(skb);
  78}
  79
  80static inline __u8 ipv6_tclass(const struct ipv6hdr *iph)
  81{
  82        return (ntohl(*(__be32 *)iph) >> 20) & 0xff;
  83}
  84
  85/* 
  86   This structure contains results of exthdrs parsing
  87   as offsets from skb->nh.
  88 */
  89
  90struct inet6_skb_parm {
  91        int                     iif;
  92        __u16                   ra;
  93        __u16                   hop;
  94        __u16                   dst0;
  95        __u16                   srcrt;
  96        __u16                   dst1;
  97        __u16                   lastopt;
  98        __u16                   nhoff;
  99        __u16                   flags;
 100#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 101        __u16                   dsthao;
 102#endif
 103        __u16                   frag_max_size;
 104
 105#define IP6SKB_XFRM_TRANSFORMED 1
 106#define IP6SKB_FORWARDED        2
 107#define IP6SKB_REROUTED         4
 108};
 109
 110#define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 111#define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 112
 113static inline int inet6_iif(const struct sk_buff *skb)
 114{
 115        return IP6CB(skb)->iif;
 116}
 117
 118struct inet6_request_sock {
 119        struct in6_addr         loc_addr;
 120        struct in6_addr         rmt_addr;
 121        struct sk_buff          *pktopts;
 122        int                     iif;
 123};
 124
 125struct tcp6_request_sock {
 126        struct tcp_request_sock   tcp6rsk_tcp;
 127        struct inet6_request_sock tcp6rsk_inet6;
 128};
 129
 130struct ipv6_mc_socklist;
 131struct ipv6_ac_socklist;
 132struct ipv6_fl_socklist;
 133
 134/**
 135 * struct ipv6_pinfo - ipv6 private area
 136 *
 137 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 138 * this _must_ be the last member, so that inet6_sk_generic
 139 * is able to calculate its offset from the base struct sock
 140 * by using the struct proto->slab_obj_size member. -acme
 141 */
 142struct ipv6_pinfo {
 143        struct in6_addr         saddr;
 144        struct in6_addr         rcv_saddr;
 145        struct in6_addr         daddr;
 146        struct in6_pktinfo      sticky_pktinfo;
 147        const struct in6_addr           *daddr_cache;
 148#ifdef CONFIG_IPV6_SUBTREES
 149        const struct in6_addr           *saddr_cache;
 150#endif
 151
 152        __be32                  flow_label;
 153        __u32                   frag_size;
 154
 155        /*
 156         * Packed in 16bits.
 157         * Omit one shift by by putting the signed field at MSB.
 158         */
 159#if defined(__BIG_ENDIAN_BITFIELD)
 160        __s16                   hop_limit:9;
 161        __u16                   __unused_1:7;
 162#else
 163        __u16                   __unused_1:7;
 164        __s16                   hop_limit:9;
 165#endif
 166
 167#if defined(__BIG_ENDIAN_BITFIELD)
 168        /* Packed in 16bits. */
 169        __s16                   mcast_hops:9;
 170        __u16                   __unused_2:6,
 171                                mc_loop:1;
 172#else
 173        __u16                   mc_loop:1,
 174                                __unused_2:6;
 175        __s16                   mcast_hops:9;
 176#endif
 177        int                     ucast_oif;
 178        int                     mcast_oif;
 179
 180        /* pktoption flags */
 181        union {
 182                struct {
 183                        __u16   srcrt:1,
 184                                osrcrt:1,
 185                                rxinfo:1,
 186                                rxoinfo:1,
 187                                rxhlim:1,
 188                                rxohlim:1,
 189                                hopopts:1,
 190                                ohopopts:1,
 191                                dstopts:1,
 192                                odstopts:1,
 193                                rxflow:1,
 194                                rxtclass:1,
 195                                rxpmtu:1,
 196                                rxorigdstaddr:1;
 197                                /* 2 bits hole */
 198                } bits;
 199                __u16           all;
 200        } rxopt;
 201
 202        /* sockopt flags */
 203        __u16                   recverr:1,
 204                                sndflow:1,
 205                                pmtudisc:2,
 206                                ipv6only:1,
 207                                srcprefs:3,     /* 001: prefer temporary address
 208                                                 * 010: prefer public address
 209                                                 * 100: prefer care-of address
 210                                                 */
 211                                dontfrag:1;
 212        __u8                    min_hopcount;
 213        __u8                    tclass;
 214        __u8                    rcv_tclass;
 215
 216        __u32                   dst_cookie;
 217        __u32                   rx_dst_cookie;
 218
 219        struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 220        struct ipv6_ac_socklist *ipv6_ac_list;
 221        struct ipv6_fl_socklist *ipv6_fl_list;
 222
 223        struct ipv6_txoptions   *opt;
 224        struct sk_buff          *pktoptions;
 225        struct sk_buff          *rxpmtu;
 226        struct {
 227                struct ipv6_txoptions *opt;
 228                u8 hop_limit;
 229                u8 tclass;
 230        } cork;
 231};
 232
 233/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 234struct raw6_sock {
 235        /* inet_sock has to be the first member of raw6_sock */
 236        struct inet_sock        inet;
 237        __u32                   checksum;       /* perform checksum */
 238        __u32                   offset;         /* checksum offset  */
 239        struct icmp6_filter     filter;
 240        __u32                   ip6mr_table;
 241        /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 242        struct ipv6_pinfo       inet6;
 243};
 244
 245struct udp6_sock {
 246        struct udp_sock   udp;
 247        /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 248        struct ipv6_pinfo inet6;
 249};
 250
 251struct tcp6_sock {
 252        struct tcp_sock   tcp;
 253        /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 254        struct ipv6_pinfo inet6;
 255};
 256
 257extern int inet6_sk_rebuild_header(struct sock *sk);
 258
 259struct inet6_timewait_sock {
 260        struct in6_addr tw_v6_daddr;
 261        struct in6_addr tw_v6_rcv_saddr;
 262};
 263
 264struct tcp6_timewait_sock {
 265        struct tcp_timewait_sock   tcp6tw_tcp;
 266        struct inet6_timewait_sock tcp6tw_inet6;
 267};
 268
 269static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 270{
 271        return (struct inet6_timewait_sock *)(((u8 *)sk) +
 272                                              inet_twsk(sk)->tw_ipv6_offset);
 273}
 274
 275#if IS_ENABLED(CONFIG_IPV6)
 276static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 277{
 278        return inet_sk(__sk)->pinet6;
 279}
 280
 281static inline struct inet6_request_sock *
 282                        inet6_rsk(const struct request_sock *rsk)
 283{
 284        return (struct inet6_request_sock *)(((u8 *)rsk) +
 285                                             inet_rsk(rsk)->inet6_rsk_offset);
 286}
 287
 288static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 289{
 290        return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 291}
 292
 293static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 294{
 295        struct request_sock *req = reqsk_alloc(ops);
 296
 297        if (req != NULL) {
 298                inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 299                inet6_rsk(req)->pktopts = NULL;
 300        }
 301
 302        return req;
 303}
 304
 305static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 306{
 307        return (struct raw6_sock *)sk;
 308}
 309
 310static inline void inet_sk_copy_descendant(struct sock *sk_to,
 311                                           const struct sock *sk_from)
 312{
 313        int ancestor_size = sizeof(struct inet_sock);
 314
 315        if (sk_from->sk_family == PF_INET6)
 316                ancestor_size += sizeof(struct ipv6_pinfo);
 317
 318        __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 319}
 320
 321#define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 322#define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 323
 324static inline u16 inet6_tw_offset(const struct proto *prot)
 325{
 326        return prot->twsk_prot->twsk_obj_size -
 327                        sizeof(struct inet6_timewait_sock);
 328}
 329
 330static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 331{
 332        return likely(sk->sk_state != TCP_TIME_WAIT) ?
 333                &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 334}
 335
 336static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 337{
 338        return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 339}
 340
 341static inline int inet_v6_ipv6only(const struct sock *sk)
 342{
 343        return likely(sk->sk_state != TCP_TIME_WAIT) ?
 344                ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 345}
 346#else
 347#define __ipv6_only_sock(sk)    0
 348#define ipv6_only_sock(sk)      0
 349
 350static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 351{
 352        return NULL;
 353}
 354
 355static inline struct inet6_request_sock *
 356                        inet6_rsk(const struct request_sock *rsk)
 357{
 358        return NULL;
 359}
 360
 361static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 362{
 363        return NULL;
 364}
 365
 366#define __inet6_rcv_saddr(__sk) NULL
 367#define inet6_rcv_saddr(__sk)   NULL
 368#define tcp_twsk_ipv6only(__sk)         0
 369#define inet_v6_ipv6only(__sk)          0
 370#endif /* IS_ENABLED(CONFIG_IPV6) */
 371
 372#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 373        ((inet_sk(__sk)->inet_portpair == (__ports))            &&      \
 374         ((__sk)->sk_family == AF_INET6)                        &&      \
 375         ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     &&      \
 376         ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) &&      \
 377         (!(__sk)->sk_bound_dev_if      ||                              \
 378           ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 379         net_eq(sock_net(__sk), (__net)))
 380
 381#define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 382        ((inet_twsk(__sk)->tw_portpair == (__ports))                    && \
 383         ((__sk)->sk_family == AF_INET6)                                && \
 384         ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))     && \
 385         ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \
 386         (!(__sk)->sk_bound_dev_if      ||                                 \
 387          ((__sk)->sk_bound_dev_if == (__dif)))                         && \
 388         net_eq(sock_net(__sk), (__net)))
 389
 390#endif /* _IPV6_H */
 391
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