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