include/net/inet_sock.h

   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
  23 #include <net/flow.h>
  24 #include <net/sock.h>
  25 #include <net/request_sock.h>
  26
  27 /** struct ip_options - IP Options
  28  *
  29  * @faddr - Saved first hop address
  30  * @is_data - Options in __data, rather than skb
  31  * @is_strictroute - Strict source route
  32  * @srr_is_hit - Packet destination addr was our one
  33  * @is_changed - IP checksum more not valid
  34  * @rr_needaddr - Need to record addr of outgoing dev
  35  * @ts_needtime - Need to record timestamp
  36  * @ts_needaddr - Need to record addr of outgoing dev
  37  */
  38 struct ip_options {
  39         __be32          faddr;
  40         unsigned char   optlen;
  41         unsigned char   srr;
  42         unsigned char   rr;
  43         unsigned char   ts;
  44         unsigned char   is_data:1,
  45                         is_strictroute:1,
  46                         srr_is_hit:1,
  47                         is_changed:1,
  48                         rr_needaddr:1,
  49                         ts_needtime:1,
  50                         ts_needaddr:1;
  51         unsigned char   router_alert;
  52         unsigned char   cipso;
  53         unsigned char   __pad2;
  54         unsigned char   __data[0];
  55 };
  56
  57 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
  58
  59 struct inet_request_sock {
  60         struct request_sock     req;
  61 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
  62         u16                     inet6_rsk_offset;
  63         /* 2 bytes hole, try to pack */
  64 #endif
  65         __be32                  loc_addr;
  66         __be32                  rmt_addr;
  67         __be16                  rmt_port;
  68         u16                     snd_wscale : 4,
  69                                 rcv_wscale : 4,
  70                                 tstamp_ok  : 1,
  71                                 sack_ok    : 1,
  72                                 wscale_ok  : 1,
  73                                 ecn_ok     : 1,
  74                                 acked      : 1;
  75         struct ip_options       *opt;
  76 };
  77
  78 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
  79 {
  80         return (struct inet_request_sock *)sk;
  81 }
  82
  83 struct ip_mc_socklist;
  84 struct ipv6_pinfo;
  85 struct rtable;
  86
  87 /** struct inet_sock - representation of INET sockets
  88  *
  89  * @sk - ancestor class
  90  * @pinet6 - pointer to IPv6 control block
  91  * @daddr - Foreign IPv4 addr
  92  * @rcv_saddr - Bound local IPv4 addr
  93  * @dport - Destination port
  94  * @num - Local port
  95  * @saddr - Sending source
  96  * @uc_ttl - Unicast TTL
  97  * @sport - Source port
  98  * @id - ID counter for DF pkts
  99  * @tos - TOS
 100  * @mc_ttl - Multicasting TTL
 101  * @is_icsk - is this an inet_connection_sock?
 102  * @mc_index - Multicast device index
 103  * @mc_list - Group array
 104  * @cork - info to build ip hdr on each ip frag while socket is corked
 105  */
 106 struct inet_sock {
 107         /* sk and pinet6 has to be the first two members of inet_sock */
 108         struct sock             sk;
 109 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 110         struct ipv6_pinfo       *pinet6;
 111 #endif
 112         /* Socket demultiplex comparisons on incoming packets. */
 113         __be32                  daddr;
 114         __be32                  rcv_saddr;
 115         __be16                  dport;
 116         __u16                   num;
 117         __be32                  saddr;
 118         __s16                   uc_ttl;
 119         __u16                   cmsg_flags;
 120         struct ip_options       *opt;
 121         __be16                  sport;
 122         __u16                   id;
 123         __u8                    tos;
 124         __u8                    mc_ttl;
 125         __u8                    pmtudisc;
 126         __u8                    recverr:1,
 127                                 is_icsk:1,
 128                                 freebind:1,
 129                                 hdrincl:1,
 130                                 mc_loop:1;
 131         int                     mc_index;
 132         __be32                  mc_addr;
 133         struct ip_mc_socklist   *mc_list;
 134         struct {
 135                 unsigned int            flags;
 136                 unsigned int            fragsize;
 137                 struct ip_options       *opt;
 138                 struct rtable           *rt;
 139                 int                     length; /* Total length of all frames */
 140                 __be32                  addr;
 141                 struct flowi            fl;
 142         } cork;
 143 };
 144
 145 #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
 146 #define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
 147
 148 static inline struct inet_sock *inet_sk(const struct sock *sk)
 149 {
 150         return (struct inet_sock *)sk;
 151 }
 152
 153 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
 154                                              const struct sock *sk_from,
 155                                              const int ancestor_size)
 156 {
 157         memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
 158                sk_from->sk_prot->obj_size - ancestor_size);
 159 }
 160 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
 161 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 162                                            const struct sock *sk_from)
 163 {
 164         __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
 165 }
 166 #endif
 167
 168 extern int inet_sk_rebuild_header(struct sock *sk);
 169
 170 static inline unsigned int inet_ehashfn(const __be32 laddr, const __u16 lport,
 171                                         const __be32 faddr, const __be16 fport)
 172 {
 173         unsigned int h = ((__force __u32)laddr ^ lport) ^ ((__force __u32)faddr ^ (__force __u32)fport);
 174         h ^= h >> 16;
 175         h ^= h >> 8;
 176         return h;
 177 }
 178
 179 static inline int inet_sk_ehashfn(const struct sock *sk)
 180 {
 181         const struct inet_sock *inet = inet_sk(sk);
 182         const __be32 laddr = inet->rcv_saddr;
 183         const __u16 lport = inet->num;
 184         const __be32 faddr = inet->daddr;
 185         const __be16 fport = inet->dport;
 186
 187         return inet_ehashfn(laddr, lport, faddr, fport);
 188 }
 189
 190 #endif  /* _INET_SOCK_H */