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#define ipv6_authlen(p) (((p)->hdrlen+2) << 2)
   8/*
   9 * This structure contains configuration options per IPv6 link.
  10 */
  11struct ipv6_devconf {
  12        __s32           forwarding;
  13        __s32           hop_limit;
  14        __s32           mtu6;
  15        __s32           accept_ra;
  16        __s32           accept_redirects;
  17        __s32           autoconf;
  18        __s32           dad_transmits;
  19        __s32           rtr_solicits;
  20        __s32           rtr_solicit_interval;
  21        __s32           rtr_solicit_delay;
  22        __s32           force_mld_version;
  23        __s32           mldv1_unsolicited_report_interval;
  24        __s32           mldv2_unsolicited_report_interval;
  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        __s32           max_addresses;
  31        __s32           accept_ra_defrtr;
  32        __s32           accept_ra_pinfo;
  33#ifdef CONFIG_IPV6_ROUTER_PREF
  34        __s32           accept_ra_rtr_pref;
  35        __s32           rtr_probe_interval;
  36#ifdef CONFIG_IPV6_ROUTE_INFO
  37        __s32           accept_ra_rt_info_max_plen;
  38#endif
  39#endif
  40        __s32           proxy_ndp;
  41        __s32           accept_source_route;
  42        __s32           accept_ra_from_local;
  43#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  44        __s32           optimistic_dad;
  45        __s32           use_optimistic;
  46#endif
  47#ifdef CONFIG_IPV6_MROUTE
  48        __s32           mc_forwarding;
  49#endif
  50        __s32           disable_ipv6;
  51        __s32           accept_dad;
  52        __s32           force_tllao;
  53        __s32           ndisc_notify;
  54        __s32           suppress_frag_ndisc;
  55        __s32           accept_ra_mtu;
  56        struct ipv6_stable_secret {
  57                bool initialized;
  58                struct in6_addr secret;
  59        } stable_secret;
  60        void            *sysctl;
  61};
  62
  63struct ipv6_params {
  64        __s32 disable_ipv6;
  65        __s32 autoconf;
  66};
  67extern struct ipv6_params ipv6_defaults;
  68#include <linux/icmpv6.h>
  69#include <linux/tcp.h>
  70#include <linux/udp.h>
  71
  72#include <net/inet_sock.h>
  73
  74static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  75{
  76        return (struct ipv6hdr *)skb_network_header(skb);
  77}
  78
  79static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  80{
  81        return (struct ipv6hdr *)skb_inner_network_header(skb);
  82}
  83
  84static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  85{
  86        return (struct ipv6hdr *)skb_transport_header(skb);
  87}
  88
  89/* 
  90   This structure contains results of exthdrs parsing
  91   as offsets from skb->nh.
  92 */
  93
  94struct inet6_skb_parm {
  95        int                     iif;
  96        __be16                  ra;
  97        __u16                   hop;
  98        __u16                   dst0;
  99        __u16                   srcrt;
 100        __u16                   dst1;
 101        __u16                   lastopt;
 102        __u16                   nhoff;
 103        __u16                   flags;
 104#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 105        __u16                   dsthao;
 106#endif
 107        __u16                   frag_max_size;
 108
 109#define IP6SKB_XFRM_TRANSFORMED 1
 110#define IP6SKB_FORWARDED        2
 111#define IP6SKB_REROUTED         4
 112#define IP6SKB_ROUTERALERT      8
 113#define IP6SKB_FRAGMENTED      16
 114};
 115
 116#define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 117#define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 118
 119static inline int inet6_iif(const struct sk_buff *skb)
 120{
 121        return IP6CB(skb)->iif;
 122}
 123
 124struct tcp6_request_sock {
 125        struct tcp_request_sock   tcp6rsk_tcp;
 126};
 127
 128struct ipv6_mc_socklist;
 129struct ipv6_ac_socklist;
 130struct ipv6_fl_socklist;
 131
 132struct inet6_cork {
 133        struct ipv6_txoptions *opt;
 134        u8 hop_limit;
 135        u8 tclass;
 136};
 137
 138/**
 139 * struct ipv6_pinfo - ipv6 private area
 140 *
 141 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 142 * this _must_ be the last member, so that inet6_sk_generic
 143 * is able to calculate its offset from the base struct sock
 144 * by using the struct proto->slab_obj_size member. -acme
 145 */
 146struct ipv6_pinfo {
 147        struct in6_addr         saddr;
 148        struct in6_pktinfo      sticky_pktinfo;
 149        const struct in6_addr           *daddr_cache;
 150#ifdef CONFIG_IPV6_SUBTREES
 151        const struct in6_addr           *saddr_cache;
 152#endif
 153
 154        __be32                  flow_label;
 155        __u32                   frag_size;
 156
 157        /*
 158         * Packed in 16bits.
 159         * Omit one shift by by putting the signed field at MSB.
 160         */
 161#if defined(__BIG_ENDIAN_BITFIELD)
 162        __s16                   hop_limit:9;
 163        __u16                   __unused_1:7;
 164#else
 165        __u16                   __unused_1:7;
 166        __s16                   hop_limit:9;
 167#endif
 168
 169#if defined(__BIG_ENDIAN_BITFIELD)
 170        /* Packed in 16bits. */
 171        __s16                   mcast_hops:9;
 172        __u16                   __unused_2:6,
 173                                mc_loop:1;
 174#else
 175        __u16                   mc_loop:1,
 176                                __unused_2:6;
 177        __s16                   mcast_hops:9;
 178#endif
 179        int                     ucast_oif;
 180        int                     mcast_oif;
 181
 182        /* pktoption flags */
 183        union {
 184                struct {
 185                        __u16   srcrt:1,
 186                                osrcrt:1,
 187                                rxinfo:1,
 188                                rxoinfo:1,
 189                                rxhlim:1,
 190                                rxohlim:1,
 191                                hopopts:1,
 192                                ohopopts:1,
 193                                dstopts:1,
 194                                odstopts:1,
 195                                rxflow:1,
 196                                rxtclass:1,
 197                                rxpmtu:1,
 198                                rxorigdstaddr:1;
 199                                /* 2 bits hole */
 200                } bits;
 201                __u16           all;
 202        } rxopt;
 203
 204        /* sockopt flags */
 205        __u16                   recverr:1,
 206                                sndflow:1,
 207                                repflow:1,
 208                                pmtudisc:3,
 209                                padding:1,      /* 1 bit hole */
 210                                srcprefs:3,     /* 001: prefer temporary address
 211                                                 * 010: prefer public address
 212                                                 * 100: prefer care-of address
 213                                                 */
 214                                dontfrag:1,
 215                                autoflowlabel:1;
 216        __u8                    min_hopcount;
 217        __u8                    tclass;
 218        __be32                  rcv_flowinfo;
 219
 220        __u32                   dst_cookie;
 221        __u32                   rx_dst_cookie;
 222
 223        struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 224        struct ipv6_ac_socklist *ipv6_ac_list;
 225        struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 226
 227        struct ipv6_txoptions   *opt;
 228        struct sk_buff          *pktoptions;
 229        struct sk_buff          *rxpmtu;
 230        struct inet6_cork       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 tcp6_timewait_sock {
 260        struct tcp_timewait_sock   tcp6tw_tcp;
 261};
 262
 263#if IS_ENABLED(CONFIG_IPV6)
 264static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 265{
 266        return inet_sk(__sk)->pinet6;
 267}
 268
 269static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 270{
 271        return (struct raw6_sock *)sk;
 272}
 273
 274static inline void inet_sk_copy_descendant(struct sock *sk_to,
 275                                           const struct sock *sk_from)
 276{
 277        int ancestor_size = sizeof(struct inet_sock);
 278
 279        if (sk_from->sk_family == PF_INET6)
 280                ancestor_size += sizeof(struct ipv6_pinfo);
 281
 282        __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 283}
 284
 285#define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 286#define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 287#define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 288                                 inet6_sk(sk)->rxopt.bits.rxinfo)
 289
 290static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 291{
 292        if (sk->sk_family == AF_INET6)
 293                return &sk->sk_v6_rcv_saddr;
 294        return NULL;
 295}
 296
 297static inline int inet_v6_ipv6only(const struct sock *sk)
 298{
 299        /* ipv6only field is at same position for timewait and other sockets */
 300        return ipv6_only_sock(sk);
 301}
 302#else
 303#define __ipv6_only_sock(sk)    0
 304#define ipv6_only_sock(sk)      0
 305#define ipv6_sk_rxinfo(sk)      0
 306
 307static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 308{
 309        return NULL;
 310}
 311
 312static inline struct inet6_request_sock *
 313                        inet6_rsk(const struct request_sock *rsk)
 314{
 315        return NULL;
 316}
 317
 318static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 319{
 320        return NULL;
 321}
 322
 323#define inet6_rcv_saddr(__sk)   NULL
 324#define tcp_twsk_ipv6only(__sk)         0
 325#define inet_v6_ipv6only(__sk)          0
 326#endif /* IS_ENABLED(CONFIG_IPV6) */
 327#endif /* _IPV6_H */
 328
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