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_min_hop_limit;
  33        __s32           accept_ra_pinfo;
  34        __s32           ignore_routes_with_linkdown;
  35#ifdef CONFIG_IPV6_ROUTER_PREF
  36        __s32           accept_ra_rtr_pref;
  37        __s32           rtr_probe_interval;
  38#ifdef CONFIG_IPV6_ROUTE_INFO
  39        __s32           accept_ra_rt_info_max_plen;
  40#endif
  41#endif
  42        __s32           proxy_ndp;
  43        __s32           accept_source_route;
  44        __s32           accept_ra_from_local;
  45#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
  46        __s32           optimistic_dad;
  47        __s32           use_optimistic;
  48#endif
  49#ifdef CONFIG_IPV6_MROUTE
  50        __s32           mc_forwarding;
  51#endif
  52        __s32           disable_ipv6;
  53        __s32           accept_dad;
  54        __s32           force_tllao;
  55        __s32           ndisc_notify;
  56        __s32           suppress_frag_ndisc;
  57        __s32           accept_ra_mtu;
  58        struct ipv6_stable_secret {
  59                bool initialized;
  60                struct in6_addr secret;
  61        } stable_secret;
  62        __s32           use_oif_addrs_only;
  63        void            *sysctl;
  64};
  65
  66struct ipv6_params {
  67        __s32 disable_ipv6;
  68        __s32 autoconf;
  69};
  70extern struct ipv6_params ipv6_defaults;
  71#include <linux/icmpv6.h>
  72#include <linux/tcp.h>
  73#include <linux/udp.h>
  74
  75#include <net/inet_sock.h>
  76
  77static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
  78{
  79        return (struct ipv6hdr *)skb_network_header(skb);
  80}
  81
  82static inline struct ipv6hdr *inner_ipv6_hdr(const struct sk_buff *skb)
  83{
  84        return (struct ipv6hdr *)skb_inner_network_header(skb);
  85}
  86
  87static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
  88{
  89        return (struct ipv6hdr *)skb_transport_header(skb);
  90}
  91
  92/* 
  93   This structure contains results of exthdrs parsing
  94   as offsets from skb->nh.
  95 */
  96
  97struct inet6_skb_parm {
  98        int                     iif;
  99        __be16                  ra;
 100        __u16                   dst0;
 101        __u16                   srcrt;
 102        __u16                   dst1;
 103        __u16                   lastopt;
 104        __u16                   nhoff;
 105        __u16                   flags;
 106#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 107        __u16                   dsthao;
 108#endif
 109        __u16                   frag_max_size;
 110
 111#define IP6SKB_XFRM_TRANSFORMED 1
 112#define IP6SKB_FORWARDED        2
 113#define IP6SKB_REROUTED         4
 114#define IP6SKB_ROUTERALERT      8
 115#define IP6SKB_FRAGMENTED      16
 116#define IP6SKB_HOPBYHOP        32
 117};
 118
 119#define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 120#define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 121
 122static inline int inet6_iif(const struct sk_buff *skb)
 123{
 124        return IP6CB(skb)->iif;
 125}
 126
 127struct tcp6_request_sock {
 128        struct tcp_request_sock   tcp6rsk_tcp;
 129};
 130
 131struct ipv6_mc_socklist;
 132struct ipv6_ac_socklist;
 133struct ipv6_fl_socklist;
 134
 135struct inet6_cork {
 136        struct ipv6_txoptions *opt;
 137        u8 hop_limit;
 138        u8 tclass;
 139};
 140
 141/**
 142 * struct ipv6_pinfo - ipv6 private area
 143 *
 144 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 145 * this _must_ be the last member, so that inet6_sk_generic
 146 * is able to calculate its offset from the base struct sock
 147 * by using the struct proto->slab_obj_size member. -acme
 148 */
 149struct ipv6_pinfo {
 150        struct in6_addr         saddr;
 151        struct in6_pktinfo      sticky_pktinfo;
 152        const struct in6_addr           *daddr_cache;
 153#ifdef CONFIG_IPV6_SUBTREES
 154        const struct in6_addr           *saddr_cache;
 155#endif
 156
 157        __be32                  flow_label;
 158        __u32                   frag_size;
 159
 160        /*
 161         * Packed in 16bits.
 162         * Omit one shift by by putting the signed field at MSB.
 163         */
 164#if defined(__BIG_ENDIAN_BITFIELD)
 165        __s16                   hop_limit:9;
 166        __u16                   __unused_1:7;
 167#else
 168        __u16                   __unused_1:7;
 169        __s16                   hop_limit:9;
 170#endif
 171
 172#if defined(__BIG_ENDIAN_BITFIELD)
 173        /* Packed in 16bits. */
 174        __s16                   mcast_hops:9;
 175        __u16                   __unused_2:6,
 176                                mc_loop:1;
 177#else
 178        __u16                   mc_loop:1,
 179                                __unused_2:6;
 180        __s16                   mcast_hops:9;
 181#endif
 182        int                     ucast_oif;
 183        int                     mcast_oif;
 184
 185        /* pktoption flags */
 186        union {
 187                struct {
 188                        __u16   srcrt:1,
 189                                osrcrt:1,
 190                                rxinfo:1,
 191                                rxoinfo:1,
 192                                rxhlim:1,
 193                                rxohlim:1,
 194                                hopopts:1,
 195                                ohopopts:1,
 196                                dstopts:1,
 197                                odstopts:1,
 198                                rxflow:1,
 199                                rxtclass:1,
 200                                rxpmtu:1,
 201                                rxorigdstaddr:1;
 202                                /* 2 bits hole */
 203                } bits;
 204                __u16           all;
 205        } rxopt;
 206
 207        /* sockopt flags */
 208        __u16                   recverr:1,
 209                                sndflow:1,
 210                                repflow:1,
 211                                pmtudisc:3,
 212                                padding:1,      /* 1 bit hole */
 213                                srcprefs:3,     /* 001: prefer temporary address
 214                                                 * 010: prefer public address
 215                                                 * 100: prefer care-of address
 216                                                 */
 217                                dontfrag:1,
 218                                autoflowlabel:1;
 219        __u8                    min_hopcount;
 220        __u8                    tclass;
 221        __be32                  rcv_flowinfo;
 222
 223        __u32                   dst_cookie;
 224        __u32                   rx_dst_cookie;
 225
 226        struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 227        struct ipv6_ac_socklist *ipv6_ac_list;
 228        struct ipv6_fl_socklist __rcu *ipv6_fl_list;
 229
 230        struct ipv6_txoptions __rcu     *opt;
 231        struct sk_buff          *pktoptions;
 232        struct sk_buff          *rxpmtu;
 233        struct inet6_cork       cork;
 234};
 235
 236/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 237struct raw6_sock {
 238        /* inet_sock has to be the first member of raw6_sock */
 239        struct inet_sock        inet;
 240        __u32                   checksum;       /* perform checksum */
 241        __u32                   offset;         /* checksum offset  */
 242        struct icmp6_filter     filter;
 243        __u32                   ip6mr_table;
 244        /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 245        struct ipv6_pinfo       inet6;
 246};
 247
 248struct udp6_sock {
 249        struct udp_sock   udp;
 250        /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 251        struct ipv6_pinfo inet6;
 252};
 253
 254struct tcp6_sock {
 255        struct tcp_sock   tcp;
 256        /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 257        struct ipv6_pinfo inet6;
 258};
 259
 260extern int inet6_sk_rebuild_header(struct sock *sk);
 261
 262struct tcp6_timewait_sock {
 263        struct tcp_timewait_sock   tcp6tw_tcp;
 264};
 265
 266#if IS_ENABLED(CONFIG_IPV6)
 267static inline struct ipv6_pinfo *inet6_sk(const struct sock *__sk)
 268{
 269        return sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;
 270}
 271
 272static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 273{
 274        return (struct raw6_sock *)sk;
 275}
 276
 277static inline void inet_sk_copy_descendant(struct sock *sk_to,
 278                                           const struct sock *sk_from)
 279{
 280        int ancestor_size = sizeof(struct inet_sock);
 281
 282        if (sk_from->sk_family == PF_INET6)
 283                ancestor_size += sizeof(struct ipv6_pinfo);
 284
 285        __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 286}
 287
 288#define __ipv6_only_sock(sk)    (sk->sk_ipv6only)
 289#define ipv6_only_sock(sk)      (__ipv6_only_sock(sk))
 290#define ipv6_sk_rxinfo(sk)      ((sk)->sk_family == PF_INET6 && \
 291                                 inet6_sk(sk)->rxopt.bits.rxinfo)
 292
 293static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 294{
 295        if (sk->sk_family == AF_INET6)
 296                return &sk->sk_v6_rcv_saddr;
 297        return NULL;
 298}
 299
 300static inline int inet_v6_ipv6only(const struct sock *sk)
 301{
 302        /* ipv6only field is at same position for timewait and other sockets */
 303        return ipv6_only_sock(sk);
 304}
 305#else
 306#define __ipv6_only_sock(sk)    0
 307#define ipv6_only_sock(sk)      0
 308#define ipv6_sk_rxinfo(sk)      0
 309
 310static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 311{
 312        return NULL;
 313}
 314
 315static inline struct inet6_request_sock *
 316                        inet6_rsk(const struct request_sock *rsk)
 317{
 318        return NULL;
 319}
 320
 321static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 322{
 323        return NULL;
 324}
 325
 326#define inet6_rcv_saddr(__sk)   NULL
 327#define tcp_twsk_ipv6only(__sk)         0
 328#define inet_v6_ipv6only(__sk)          0
 329#endif /* IS_ENABLED(CONFIG_IPV6) */
 330#endif /* _IPV6_H */
 331
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