LXR linux/net/ipv4/udplite.c

   1/*
   2 *  UDPLITE     An implementation of the UDP-Lite protocol (RFC 3828).
   3 *
   4 *  Version:    $Id: udplite.c,v 1.25 2006/10/19 07:22:36 gerrit Exp $
   5 *
   6 *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
   7 *
   8 *  Changes:
   9 *  Fixes:
  10 *              This program is free software; you can redistribute it and/or
  11 *              modify it under the terms of the GNU General Public License
  12 *              as published by the Free Software Foundation; either version
  13 *              2 of the License, or (at your option) any later version.
  14 */
  15#include "udp_impl.h"
  16DEFINE_SNMP_STAT(struct udp_mib, udplite_statistics)    __read_mostly;
  17
  18struct hlist_head       udplite_hash[UDP_HTABLE_SIZE];
  19
  20int udplite_get_port(struct sock *sk, unsigned short p,
  21                     int (*c)(const struct sock *, const struct sock *))
  22{
  23        return  __udp_lib_get_port(sk, p, udplite_hash, c);
  24}
  25
  26static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
  27{
  28        return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal);
  29}
  30
  31static int udplite_rcv(struct sk_buff *skb)
  32{
  33        return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
  34}
  35
  36static void udplite_err(struct sk_buff *skb, u32 info)
  37{
  38        return __udp4_lib_err(skb, info, udplite_hash);
  39}
  40
  41static  struct net_protocol udplite_protocol = {
  42        .handler        = udplite_rcv,
  43        .err_handler    = udplite_err,
  44        .no_policy      = 1,
  45};
  46
  47DEFINE_PROTO_INUSE(udplite)
  48
  49struct proto    udplite_prot = {
  50        .name              = "UDP-Lite",
  51        .owner             = THIS_MODULE,
  52        .close             = udp_lib_close,
  53        .connect           = ip4_datagram_connect,
  54        .disconnect        = udp_disconnect,
  55        .ioctl             = udp_ioctl,
  56        .init              = udplite_sk_init,
  57        .destroy           = udp_destroy_sock,
  58        .setsockopt        = udp_setsockopt,
  59        .getsockopt        = udp_getsockopt,
  60        .sendmsg           = udp_sendmsg,
  61        .recvmsg           = udp_recvmsg,
  62        .sendpage          = udp_sendpage,
  63        .backlog_rcv       = udp_queue_rcv_skb,
  64        .hash              = udp_lib_hash,
  65        .unhash            = udp_lib_unhash,
  66        .get_port          = udplite_v4_get_port,
  67        .obj_size          = sizeof(struct udp_sock),
  68#ifdef CONFIG_COMPAT
  69        .compat_setsockopt = compat_udp_setsockopt,
  70        .compat_getsockopt = compat_udp_getsockopt,
  71#endif
  72        REF_PROTO_INUSE(udplite)
  73};
  74
  75static struct inet_protosw udplite4_protosw = {
  76        .type           =  SOCK_DGRAM,
  77        .protocol       =  IPPROTO_UDPLITE,
  78        .prot           =  &udplite_prot,
  79        .ops            =  &inet_dgram_ops,
  80        .capability     = -1,
  81        .no_check       =  0,           /* must checksum (RFC 3828) */
  82        .flags          =  INET_PROTOSW_PERMANENT,
  83};
  84
  85#ifdef CONFIG_PROC_FS
  86static struct file_operations udplite4_seq_fops;
  87static struct udp_seq_afinfo udplite4_seq_afinfo = {
  88        .owner          = THIS_MODULE,
  89        .name           = "udplite",
  90        .family         = AF_INET,
  91        .hashtable      = udplite_hash,
  92        .seq_show       = udp4_seq_show,
  93        .seq_fops       = &udplite4_seq_fops,
  94};
  95#endif
  96
  97void __init udplite4_register(void)
  98{
  99        if (proto_register(&udplite_prot, 1))
 100                goto out_register_err;
 101
 102        if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 103                goto out_unregister_proto;
 104
 105        inet_register_protosw(&udplite4_protosw);
 106
 107#ifdef CONFIG_PROC_FS
 108        if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */
 109                printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__);
 110#endif
 111        return;
 112
 113out_unregister_proto:
 114        proto_unregister(&udplite_prot);
 115out_register_err:
 116        printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__);
 117}
 118
 119EXPORT_SYMBOL(udplite_hash);
 120EXPORT_SYMBOL(udplite_prot);
 121EXPORT_SYMBOL(udplite_get_port);
 122