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
  80/* 
  81   This structure contains results of exthdrs parsing
  82   as offsets from skb->nh.
  83 */
  84
  85struct inet6_skb_parm {
  86        int                     iif;
  87        __be16                  ra;
  88        __u16                   hop;
  89        __u16                   dst0;
  90        __u16                   srcrt;
  91        __u16                   dst1;
  92        __u16                   lastopt;
  93        __u16                   nhoff;
  94        __u16                   flags;
  95#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  96        __u16                   dsthao;
  97#endif
  98        __u16                   frag_max_size;
  99
 100#define IP6SKB_XFRM_TRANSFORMED 1
 101#define IP6SKB_FORWARDED        2
 102#define IP6SKB_REROUTED         4
 103#define IP6SKB_ROUTERALERT      8
 104};
 105
 106#define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 107#define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 108
 109static inline int inet6_iif(const struct sk_buff *skb)
 110{
 111        return IP6CB(skb)->iif;
 112}
 113
 114struct inet6_request_sock {
 115        struct in6_addr         loc_addr;
 116        struct in6_addr         rmt_addr;
 117        struct sk_buff          *pktopts;
 118        int                     iif;
 119};
 120
 121struct tcp6_request_sock {
 122        struct tcp_request_sock   tcp6rsk_tcp;
 123        struct inet6_request_sock tcp6rsk_inet6;
 124};
 125
 126struct ipv6_mc_socklist;
 127struct ipv6_ac_socklist;
 128struct ipv6_fl_socklist;
 129
 130/**
 131 * struct ipv6_pinfo - ipv6 private area
 132 *
 133 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 134 * this _must_ be the last member, so that inet6_sk_generic
 135 * is able to calculate its offset from the base struct sock
 136 * by using the struct proto->slab_obj_size member. -acme
 137 */
 138struct ipv6_pinfo {
 139        struct in6_addr         saddr;
 140        struct in6_addr         rcv_saddr;
 141        struct in6_addr         daddr;
 142        struct in6_pktinfo      sticky_pktinfo;
 143        const struct in6_addr           *daddr_cache;
 144#ifdef CONFIG_IPV6_SUBTREES
 145        const struct in6_addr           *saddr_cache;
 146#endif
 147
 148        __be32                  flow_label;
 149        __u32                   frag_size;
 150
 151        /*
 152         * Packed in 16bits.
 153         * Omit one shift by by putting the signed field at MSB.
 154         */
 155#if defined(__BIG_ENDIAN_BITFIELD)
 156        __s16                   hop_limit:9;
 157        __u16                   __unused_1:7;
 158#else
 159        __u16                   __unused_1:7;
 160        __s16                   hop_limit:9;
 161#endif
 162
 163#if defined(__BIG_ENDIAN_BITFIELD)
 164        /* Packed in 16bits. */
 165        __s16                   mcast_hops:9;
 166        __u16                   __unused_2:6,
 167                                mc_loop:1;
 168#else
 169        __u16                   mc_loop:1,
 170                                __unused_2:6;
 171        __s16                   mcast_hops:9;
 172#endif
 173        int                     ucast_oif;
 174        int                     mcast_oif;
 175
 176        /* pktoption flags */
 177        union {
 178                struct {
 179                        __u16   srcrt:1,
 180                                osrcrt:1,
 181                                rxinfo:1,
 182                                rxoinfo:1,
 183                                rxhlim:1,
 184                                rxohlim:1,
 185                                hopopts:1,
 186                                ohopopts:1,
 187                                dstopts:1,
 188                                odstopts:1,
 189                                rxflow:1,
 190                                rxtclass:1,
 191                                rxpmtu:1,
 192                                rxorigdstaddr:1;
 193                                /* 2 bits hole */
 194                } bits;
 195                __u16           all;
 196        } rxopt;
 197
 198        /* sockopt flags */
 199        __u16                   recverr:1,
 200                                sndflow:1,
 201                                pmtudisc:2,
 202                                ipv6only:1,
 203                                srcprefs:3,     /* 001: prefer temporary address
 204                                                 * 010: prefer public address
 205                                                 * 100: prefer care-of address
 206                                                 */
 207                                dontfrag:1;
 208        __u8                    min_hopcount;
 209        __u8                    tclass;
 210        __u8                    rcv_tclass;
 211
 212        __u32                   dst_cookie;
 213        __u32                   rx_dst_cookie;
 214
 215        struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 216        struct ipv6_ac_socklist *ipv6_ac_list;
 217        struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 218
 219        struct ipv6_txoptions   *opt;
 220        struct sk_buff          *pktoptions;
 221        struct sk_buff          *rxpmtu;
 222        struct {
 223                struct ipv6_txoptions *opt;
 224                u8 hop_limit;
 225                u8 tclass;
 226        } cork;
 227};
 228
 229/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 230struct raw6_sock {
 231        /* inet_sock has to be the first member of raw6_sock */
 232        struct inet_sock        inet;
 233        __u32                   checksum;       /* perform checksum */
 234        __u32                   offset;         /* checksum offset  */
 235        struct icmp6_filter     filter;
 236        __u32                   ip6mr_table;
 237        /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 238        struct ipv6_pinfo       inet6;
 239};
 240
 241struct udp6_sock {
 242        struct udp_sock   udp;
 243        /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 244        struct ipv6_pinfo inet6;
 245};
 246
 247struct tcp6_sock {
 248        struct tcp_sock   tcp;
 249        /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 250        struct ipv6_pinfo inet6;
 251};
 252
 253extern int inet6_sk_rebuild_header(struct sock *sk);
 254
 255struct inet6_timewait_sock {
 256        struct in6_addr tw_v6_daddr;
 257        struct in6_addr tw_v6_rcv_saddr;
 258};
 259
 260struct tcp6_timewait_sock {
 261        struct tcp_timewait_sock   tcp6tw_tcp;
 262        struct inet6_timewait_sock tcp6tw_inet6;
 263};
 264
 265static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 266{
 267        return (struct inet6_timewait_sock *)(((u8 *)sk) +
 268                                              inet_twsk(sk)->tw_ipv6_offset);
 269}
 270
 271#if IS_ENABLED(CONFIG_IPV6)
 272static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 273{
 274        return inet_sk(__sk)->pinet6;
 275}
 276
 277static inline struct inet6_request_sock *
 278                        inet6_rsk(const struct request_sock *rsk)
 279{
 280        return (struct inet6_request_sock *)(((u8 *)rsk) +
 281                                             inet_rsk(rsk)->inet6_rsk_offset);
 282}
 283
 284static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 285{
 286        return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 287}
 288
 289static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 290{
 291        struct request_sock *req = reqsk_alloc(ops);
 292
 293        if (req != NULL) {
 294                inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 295                inet6_rsk(req)->pktopts = NULL;
 296        }
 297
 298        return req;
 299}
 300
 301static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 302{
 303        return (struct raw6_sock *)sk;
 304}
 305
 306static inline void inet_sk_copy_descendant(struct sock *sk_to,
 307                                           const struct sock *sk_from)
 308{
 309        int ancestor_size = sizeof(struct inet_sock);
 310
 311        if (sk_from->sk_family == PF_INET6)
 312                ancestor_size += sizeof(struct ipv6_pinfo);
 313
 314        __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 315}
 316
 317#define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 318#define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 319
 320static inline u16 inet6_tw_offset(const struct proto *prot)
 321{
 322        return prot->twsk_prot->twsk_obj_size -
 323                        sizeof(struct inet6_timewait_sock);
 324}
 325
 326static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 327{
 328        return likely(sk->sk_state != TCP_TIME_WAIT) ?
 329                &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 330}
 331
 332static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 333{
 334        return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 335}
 336
 337static inline int inet_v6_ipv6only(const struct sock *sk)
 338{
 339        return likely(sk->sk_state != TCP_TIME_WAIT) ?
 340                ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 341}
 342#else
 343#define __ipv6_only_sock(sk)    0
 344#define ipv6_only_sock(sk)      0
 345
 346static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 347{
 348        return NULL;
 349}
 350
 351static inline struct inet6_request_sock *
 352                        inet6_rsk(const struct request_sock *rsk)
 353{
 354        return NULL;
 355}
 356
 357static 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 inet6_rcv_saddr(__sk)   NULL
 364#define tcp_twsk_ipv6only(__sk)         0
 365#define inet_v6_ipv6only(__sk)          0
 366#endif /* IS_ENABLED(CONFIG_IPV6) */
 367
 368#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 369        ((inet_sk(__sk)->inet_portpair == (__ports))            &&      \
 370         ((__sk)->sk_family == AF_INET6)                        &&      \
 371         ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     &&      \
 372         ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) &&      \
 373         (!(__sk)->sk_bound_dev_if      ||                              \
 374           ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
 375         net_eq(sock_net(__sk), (__net)))
 376
 377#define INET6_TW_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif)      \
 378        ((inet_twsk(__sk)->tw_portpair == (__ports))                    && \
 379         ((__sk)->sk_family == AF_INET6)                                && \
 380         ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))     && \
 381         ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr)) && \
 382         (!(__sk)->sk_bound_dev_if      ||                                 \
 383          ((__sk)->sk_bound_dev_if == (__dif)))                         && \
 384         net_eq(sock_net(__sk), (__net)))
 385
 386#endif /* _IPV6_H */
 387
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