net/ipv4/udplite.c

   1 /*
   2  *  UDPLITE     An implementation of the UDP-Lite protocol (RFC 3828).
   3  *
   4  *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
   5  *
   6  *  Changes:
   7  *  Fixes:
   8  *              This program is free software; you can redistribute it and/or
   9  *              modify it under the terms of the GNU General Public License
  10  *              as published by the Free Software Foundation; either version
  11  *              2 of the License, or (at your option) any later version.
  12  */
  13 #include "udp_impl.h"
  14
  15 struct hlist_head       udplite_hash[UDP_HTABLE_SIZE];
  16
  17 static int udplite_rcv(struct sk_buff *skb)
  18 {
  19         return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE);
  20 }
  21
  22 static void udplite_err(struct sk_buff *skb, u32 info)
  23 {
  24         __udp4_lib_err(skb, info, udplite_hash);
  25 }
  26
  27 static  struct net_protocol udplite_protocol = {
  28         .handler        = udplite_rcv,
  29         .err_handler    = udplite_err,
  30         .no_policy      = 1,
  31         .netns_ok       = 1,
  32 };
  33
  34 struct proto    udplite_prot = {
  35         .name              = "UDP-Lite",
  36         .owner             = THIS_MODULE,
  37         .close             = udp_lib_close,
  38         .connect           = ip4_datagram_connect,
  39         .disconnect        = udp_disconnect,
  40         .ioctl             = udp_ioctl,
  41         .init              = udplite_sk_init,
  42         .destroy           = udp_destroy_sock,
  43         .setsockopt        = udp_setsockopt,
  44         .getsockopt        = udp_getsockopt,
  45         .sendmsg           = udp_sendmsg,
  46         .recvmsg           = udp_recvmsg,
  47         .sendpage          = udp_sendpage,
  48         .backlog_rcv       = udp_queue_rcv_skb,
  49         .hash              = udp_lib_hash,
  50         .unhash            = udp_lib_unhash,
  51         .get_port          = udp_v4_get_port,
  52         .obj_size          = sizeof(struct udp_sock),
  53         .h.udp_hash        = udplite_hash,
  54 #ifdef CONFIG_COMPAT
  55         .compat_setsockopt = compat_udp_setsockopt,
  56         .compat_getsockopt = compat_udp_getsockopt,
  57 #endif
  58 };
  59
  60 static struct inet_protosw udplite4_protosw = {
  61         .type           =  SOCK_DGRAM,
  62         .protocol       =  IPPROTO_UDPLITE,
  63         .prot           =  &udplite_prot,
  64         .ops            =  &inet_dgram_ops,
  65         .capability     = -1,
  66         .no_check       =  0,           /* must checksum (RFC 3828) */
  67         .flags          =  INET_PROTOSW_PERMANENT,
  68 };
  69
  70 #ifdef CONFIG_PROC_FS
  71 static struct udp_seq_afinfo udplite4_seq_afinfo = {
  72         .name           = "udplite",
  73         .family         = AF_INET,
  74         .hashtable      = udplite_hash,
  75         .seq_fops       = {
  76                 .owner  =       THIS_MODULE,
  77         },
  78         .seq_ops        = {
  79                 .show           = udp4_seq_show,
  80         },
  81 };
  82
  83 static int udplite4_proc_init_net(struct net *net)
  84 {
  85         return udp_proc_register(net, &udplite4_seq_afinfo);
  86 }
  87
  88 static void udplite4_proc_exit_net(struct net *net)
  89 {
  90         udp_proc_unregister(net, &udplite4_seq_afinfo);
  91 }
  92
  93 static struct pernet_operations udplite4_net_ops = {
  94         .init = udplite4_proc_init_net,
  95         .exit = udplite4_proc_exit_net,
  96 };
  97
  98 static __init int udplite4_proc_init(void)
  99 {
 100         return register_pernet_subsys(&udplite4_net_ops);
 101 }
 102 #else
 103 static inline int udplite4_proc_init(void)
 104 {
 105         return 0;
 106 }
 107 #endif
 108
 109 void __init udplite4_register(void)
 110 {
 111         if (proto_register(&udplite_prot, 1))
 112                 goto out_register_err;
 113
 114         if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 115                 goto out_unregister_proto;
 116
 117         inet_register_protosw(&udplite4_protosw);
 118
 119         if (udplite4_proc_init())
 120                 printk(KERN_ERR "%s: Cannot register /proc!\n", __func__);
 121         return;
 122
 123 out_unregister_proto:
 124         proto_unregister(&udplite_prot);
 125 out_register_err:
 126         printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
 127 }
 128
 129 EXPORT_SYMBOL(udplite_hash);
 130 EXPORT_SYMBOL(udplite_prot);