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   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
  20 int 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
  26 static 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
  31 static int udplite_rcv(struct sk_buff *skb)
  32 {
  33         return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
  34 }
  35
  36 static void udplite_err(struct sk_buff *skb, u32 info)
  37 {
  38         __udp4_lib_err(skb, info, udplite_hash);
  39 }
  40
  41 static  struct net_protocol udplite_protocol = {
  42         .handler        = udplite_rcv,
  43         .err_handler    = udplite_err,
  44         .no_policy      = 1,
  45 };
  46
  47 DEFINE_PROTO_INUSE(udplite)
  48
  49 struct 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
  75 static 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
  86 static struct file_operations udplite4_seq_fops;
  87 static 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
  97 void __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", __func__);
 110 #endif
 111         return;
 112
 113 out_unregister_proto:
 114         proto_unregister(&udplite_prot);
 115 out_register_err:
 116         printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
 117 }
 118
 119 EXPORT_SYMBOL(udplite_hash);
 120 EXPORT_SYMBOL(udplite_prot);
 121 EXPORT_SYMBOL(udplite_get_port);