LXR linux/include/net/inet

   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Definitions for inet_sock
   7 *
   8 * Authors:     Many, reorganised here by
   9 *              Arnaldo Carvalho de Melo <acme@mandriva.com>
  10 *
  11 *              This program is free software; you can redistribute it and/or
  12 *              modify it under the terms of the GNU General Public License
  13 *              as published by the Free Software Foundation; either version
  14 *              2 of the License, or (at your option) any later version.
  15 */
  16#ifndef _INET_SOCK_H
  17#define _INET_SOCK_H
  18
  19
  20#include <linux/string.h>
  21#include <linux/types.h>
  22#include <linux/jhash.h>
  23
  24#include <net/flow.h>
  25#include <net/sock.h>
  26#include <net/request_sock.h>
  27#include <net/route.h>
  28#include <net/netns/hash.h>
  29
  30/** struct ip_options - IP Options
  31 *
  32 * @faddr - Saved first hop address
  33 * @is_data - Options in __data, rather than skb
  34 * @is_strictroute - Strict source route
  35 * @srr_is_hit - Packet destination addr was our one
  36 * @is_changed - IP checksum more not valid
  37 * @rr_needaddr - Need to record addr of outgoing dev
  38 * @ts_needtime - Need to record timestamp
  39 * @ts_needaddr - Need to record addr of outgoing dev
  40 */
  41struct ip_options {
  42        __be32          faddr;
  43        unsigned char   optlen;
  44        unsigned char   srr;
  45        unsigned char   rr;
  46        unsigned char   ts;
  47        unsigned char   is_strictroute:1,
  48                        srr_is_hit:1,
  49                        is_changed:1,
  50                        rr_needaddr:1,
  51                        ts_needtime:1,
  52                        ts_needaddr:1;
  53        unsigned char   router_alert;
  54        unsigned char   cipso;
  55        unsigned char   __pad2;
  56        unsigned char   __data[0];
  57};
  58
  59#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
  60
  61struct inet_request_sock {
  62        struct request_sock     req;
  63#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  64        u16                     inet6_rsk_offset;
  65        /* 2 bytes hole, try to pack */
  66#endif
  67        __be32                  loc_addr;
  68        __be32                  rmt_addr;
  69        __be16                  rmt_port;
  70        u16                     snd_wscale : 4, 
  71                                rcv_wscale : 4, 
  72                                tstamp_ok  : 1,
  73                                sack_ok    : 1,
  74                                wscale_ok  : 1,
  75                                ecn_ok     : 1,
  76                                acked      : 1;
  77        struct ip_options       *opt;
  78};
  79
  80static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
  81{
  82        return (struct inet_request_sock *)sk;
  83}
  84
  85struct ip_mc_socklist;
  86struct ipv6_pinfo;
  87struct rtable;
  88
  89/** struct inet_sock - representation of INET sockets
  90 *
  91 * @sk - ancestor class
  92 * @pinet6 - pointer to IPv6 control block
  93 * @daddr - Foreign IPv4 addr
  94 * @rcv_saddr - Bound local IPv4 addr
  95 * @dport - Destination port
  96 * @num - Local port
  97 * @saddr - Sending source
  98 * @uc_ttl - Unicast TTL
  99 * @sport - Source port
 100 * @id - ID counter for DF pkts
 101 * @tos - TOS
 102 * @mc_ttl - Multicasting TTL
 103 * @is_icsk - is this an inet_connection_sock?
 104 * @mc_index - Multicast device index
 105 * @mc_list - Group array
 106 * @cork - info to build ip hdr on each ip frag while socket is corked
 107 */
 108struct inet_sock {
 109        /* sk and pinet6 has to be the first two members of inet_sock */
 110        struct sock             sk;
 111#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 112        struct ipv6_pinfo       *pinet6;
 113#endif
 114        /* Socket demultiplex comparisons on incoming packets. */
 115        __be32                  daddr;
 116        __be32                  rcv_saddr;
 117        __be16                  dport;
 118        __u16                   num;
 119        __be32                  saddr;
 120        __s16                   uc_ttl;
 121        __u16                   cmsg_flags;
 122        struct ip_options       *opt;
 123        __be16                  sport;
 124        __u16                   id;
 125        __u8                    tos;
 126        __u8                    mc_ttl;
 127        __u8                    pmtudisc;
 128        __u8                    recverr:1,
 129                                is_icsk:1,
 130                                freebind:1,
 131                                hdrincl:1,
 132                                mc_loop:1;
 133        int                     mc_index;
 134        __be32                  mc_addr;
 135        struct ip_mc_socklist   *mc_list;
 136        struct {
 137                unsigned int            flags;
 138                unsigned int            fragsize;
 139                struct ip_options       *opt;
 140                struct dst_entry        *dst;
 141                int                     length; /* Total length of all frames */
 142                __be32                  addr;
 143                struct flowi            fl;
 144        } cork;
 145};
 146
 147#define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
 148#define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
 149
 150static inline struct inet_sock *inet_sk(const struct sock *sk)
 151{
 152        return (struct inet_sock *)sk;
 153}
 154
 155static inline void __inet_sk_copy_descendant(struct sock *sk_to,
 156                                             const struct sock *sk_from,
 157                                             const int ancestor_size)
 158{
 159        memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
 160               sk_from->sk_prot->obj_size - ancestor_size);
 161}
 162#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
 163static inline void inet_sk_copy_descendant(struct sock *sk_to,
 164                                           const struct sock *sk_from)
 165{
 166        __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
 167}
 168#endif
 169
 170extern int inet_sk_rebuild_header(struct sock *sk);
 171
 172extern u32 inet_ehash_secret;
 173extern void build_ehash_secret(void);
 174
 175static inline unsigned int inet_ehashfn(struct net *net,
 176                                        const __be32 laddr, const __u16 lport,
 177                                        const __be32 faddr, const __be16 fport)
 178{
 179        return jhash_3words((__force __u32) laddr,
 180                            (__force __u32) faddr,
 181                            ((__u32) lport) << 16 | (__force __u32)fport,
 182                            inet_ehash_secret + net_hash_mix(net));
 183}
 184
 185static inline int inet_sk_ehashfn(const struct sock *sk)
 186{
 187        const struct inet_sock *inet = inet_sk(sk);
 188        const __be32 laddr = inet->rcv_saddr;
 189        const __u16 lport = inet->num;
 190        const __be32 faddr = inet->daddr;
 191        const __be16 fport = inet->dport;
 192        struct net *net = sock_net(sk);
 193
 194        return inet_ehashfn(net, laddr, lport, faddr, fport);
 195}
 196
 197
 198static inline int inet_iif(const struct sk_buff *skb)
 199{
 200        return skb->rtable->rt_iif;
 201}
 202
 203static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
 204{
 205        struct request_sock *req = reqsk_alloc(ops);
 206
 207        if (req != NULL)
 208                inet_rsk(req)->opt = NULL;
 209
 210        return req;
 211}
 212
 213#endif  /* _INET_SOCK_H */
 214