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
  20 static int udplite_rcv(struct sk_buff *skb)
  21 {
  22         return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
  23 }
  24
  25 static void udplite_err(struct sk_buff *skb, u32 info)
  26 {
  27         __udp4_lib_err(skb, info, udplite_hash);
  28 }
  29
  30 static  struct net_protocol udplite_protocol = {
  31         .handler        = udplite_rcv,
  32         .err_handler    = udplite_err,
  33         .no_policy      = 1,
  34         .netns_ok       = 1,
  35 };
  36
  37 DEFINE_PROTO_INUSE(udplite)
  38
  39 struct proto    udplite_prot = {
  40         .name              = "UDP-Lite",
  41         .owner             = THIS_MODULE,
  42         .close             = udp_lib_close,
  43         .connect           = ip4_datagram_connect,
  44         .disconnect        = udp_disconnect,
  45         .ioctl             = udp_ioctl,
  46         .init              = udplite_sk_init,
  47         .destroy           = udp_destroy_sock,
  48         .setsockopt        = udp_setsockopt,
  49         .getsockopt        = udp_getsockopt,
  50         .sendmsg           = udp_sendmsg,
  51         .recvmsg           = udp_recvmsg,
  52         .sendpage          = udp_sendpage,
  53         .backlog_rcv       = udp_queue_rcv_skb,
  54         .hash              = udp_lib_hash,
  55         .unhash            = udp_lib_unhash,
  56         .get_port          = udp_v4_get_port,
  57         .obj_size          = sizeof(struct udp_sock),
  58         .h.udp_hash        = udplite_hash,
  59 #ifdef CONFIG_COMPAT
  60         .compat_setsockopt = compat_udp_setsockopt,
  61         .compat_getsockopt = compat_udp_getsockopt,
  62 #endif
  63         REF_PROTO_INUSE(udplite)
  64 };
  65
  66 static struct inet_protosw udplite4_protosw = {
  67         .type           =  SOCK_DGRAM,
  68         .protocol       =  IPPROTO_UDPLITE,
  69         .prot           =  &udplite_prot,
  70         .ops            =  &inet_dgram_ops,
  71         .capability     = -1,
  72         .no_check       =  0,           /* must checksum (RFC 3828) */
  73         .flags          =  INET_PROTOSW_PERMANENT,
  74 };
  75
  76 #ifdef CONFIG_PROC_FS
  77 static struct file_operations udplite4_seq_fops;
  78 static struct udp_seq_afinfo udplite4_seq_afinfo = {
  79         .owner          = THIS_MODULE,
  80         .name           = "udplite",
  81         .family         = AF_INET,
  82         .hashtable      = udplite_hash,
  83         .seq_show       = udp4_seq_show,
  84         .seq_fops       = &udplite4_seq_fops,
  85 };
  86
  87 static int udplite4_proc_init_net(struct net *net)
  88 {
  89         return udp_proc_register(net, &udplite4_seq_afinfo);
  90 }
  91
  92 static void udplite4_proc_exit_net(struct net *net)
  93 {
  94         udp_proc_unregister(net, &udplite4_seq_afinfo);
  95 }
  96
  97 static struct pernet_operations udplite4_net_ops = {
  98         .init = udplite4_proc_init_net,
  99         .exit = udplite4_proc_exit_net,
 100 };
 101
 102 static __init int udplite4_proc_init(void)
 103 {
 104         return register_pernet_subsys(&udplite4_net_ops);
 105 }
 106 #else
 107 static inline int udplite4_proc_init(void)
 108 {
 109         return 0;
 110 }
 111 #endif
 112
 113 void __init udplite4_register(void)
 114 {
 115         if (proto_register(&udplite_prot, 1))
 116                 goto out_register_err;
 117
 118         if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 119                 goto out_unregister_proto;
 120
 121         inet_register_protosw(&udplite4_protosw);
 122
 123         if (udplite4_proc_init())
 124                 printk(KERN_ERR "%s: Cannot register /proc!\n", __func__);
 125         return;
 126
 127 out_unregister_proto:
 128         proto_unregister(&udplite_prot);
 129 out_register_err:
 130         printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
 131 }
 132
 133 EXPORT_SYMBOL(udplite_hash);
 134 EXPORT_SYMBOL(udplite_prot);