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"
  16 DEFINE_SNMP_STAT(struct udp_mib, udplite_statistics)    __read_mostly;
  17
  18 struct hlist_head       udplite_hash[UDP_HTABLE_SIZE];
  19 static int              udplite_port_rover;
  20
  21 int udplite_get_port(struct sock *sk, unsigned short p,
  22                      int (*c)(const struct sock *, const struct sock *))
  23 {
  24         return  __udp_lib_get_port(sk, p, udplite_hash, &udplite_port_rover, c);
  25 }
  26
  27 static int udplite_v4_get_port(struct sock *sk, unsigned short snum)
  28 {
  29         return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal);
  30 }
  31
  32 static int udplite_rcv(struct sk_buff *skb)
  33 {
  34         return __udp4_lib_rcv(skb, udplite_hash, 1);
  35 }
  36
  37 static void udplite_err(struct sk_buff *skb, u32 info)
  38 {
  39         return __udp4_lib_err(skb, info, udplite_hash);
  40 }
  41
  42 static  struct net_protocol udplite_protocol = {
  43         .handler        = udplite_rcv,
  44         .err_handler    = udplite_err,
  45         .no_policy      = 1,
  46 };
  47
  48 struct proto    udplite_prot = {
  49         .name              = "UDP-Lite",
  50         .owner             = THIS_MODULE,
  51         .close             = udp_lib_close,
  52         .connect           = ip4_datagram_connect,
  53         .disconnect        = udp_disconnect,
  54         .ioctl             = udp_ioctl,
  55         .init              = udplite_sk_init,
  56         .destroy           = udp_destroy_sock,
  57         .setsockopt        = udp_setsockopt,
  58         .getsockopt        = udp_getsockopt,
  59         .sendmsg           = udp_sendmsg,
  60         .recvmsg           = udp_recvmsg,
  61         .sendpage          = udp_sendpage,
  62         .backlog_rcv       = udp_queue_rcv_skb,
  63         .hash              = udp_lib_hash,
  64         .unhash            = udp_lib_unhash,
  65         .get_port          = udplite_v4_get_port,
  66         .obj_size          = sizeof(struct udp_sock),
  67 #ifdef CONFIG_COMPAT
  68         .compat_setsockopt = compat_udp_setsockopt,
  69         .compat_getsockopt = compat_udp_getsockopt,
  70 #endif
  71 };
  72
  73 static struct inet_protosw udplite4_protosw = {
  74         .type           =  SOCK_DGRAM,
  75         .protocol       =  IPPROTO_UDPLITE,
  76         .prot           =  &udplite_prot,
  77         .ops            =  &inet_dgram_ops,
  78         .capability     = -1,
  79         .no_check       =  0,           /* must checksum (RFC 3828) */
  80         .flags          =  INET_PROTOSW_PERMANENT,
  81 };
  82
  83 #ifdef CONFIG_PROC_FS
  84 static struct file_operations udplite4_seq_fops;
  85 static struct udp_seq_afinfo udplite4_seq_afinfo = {
  86         .owner          = THIS_MODULE,
  87         .name           = "udplite",
  88         .family         = AF_INET,
  89         .hashtable      = udplite_hash,
  90         .seq_show       = udp4_seq_show,
  91         .seq_fops       = &udplite4_seq_fops,
  92 };
  93 #endif
  94
  95 void __init udplite4_register(void)
  96 {
  97         if (proto_register(&udplite_prot, 1))
  98                 goto out_register_err;
  99
 100         if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 101                 goto out_unregister_proto;
 102
 103         inet_register_protosw(&udplite4_protosw);
 104
 105 #ifdef CONFIG_PROC_FS
 106         if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */
 107                 printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__);
 108 #endif
 109         return;
 110
 111 out_unregister_proto:
 112         proto_unregister(&udplite_prot);
 113 out_register_err:
 114         printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__);
 115 }
 116
 117 EXPORT_SYMBOL(udplite_hash);
 118 EXPORT_SYMBOL(udplite_prot);
 119 EXPORT_SYMBOL(udplite_get_port);