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 udp_table        udplite_table __read_mostly;
  16 EXPORT_SYMBOL(udplite_table);
  17
  18 static int udplite_rcv(struct sk_buff *skb)
  19 {
  20         return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
  21 }
  22
  23 static void udplite_err(struct sk_buff *skb, u32 info)
  24 {
  25         __udp4_lib_err(skb, info, &udplite_table);
  26 }
  27
  28 static const struct net_protocol udplite_protocol = {
  29         .handler        = udplite_rcv,
  30         .err_handler    = udplite_err,
  31         .no_policy      = 1,
  32         .netns_ok       = 1,
  33 };
  34
  35 struct proto    udplite_prot = {
  36         .name              = "UDP-Lite",
  37         .owner             = THIS_MODULE,
  38         .close             = udp_lib_close,
  39         .connect           = ip4_datagram_connect,
  40         .disconnect        = udp_disconnect,
  41         .ioctl             = udp_ioctl,
  42         .init              = udplite_sk_init,
  43         .destroy           = udp_destroy_sock,
  44         .setsockopt        = udp_setsockopt,
  45         .getsockopt        = udp_getsockopt,
  46         .sendmsg           = udp_sendmsg,
  47         .recvmsg           = udp_recvmsg,
  48         .sendpage          = udp_sendpage,
  49         .backlog_rcv       = udp_queue_rcv_skb,
  50         .hash              = udp_lib_hash,
  51         .unhash            = udp_lib_unhash,
  52         .get_port          = udp_v4_get_port,
  53         .obj_size          = sizeof(struct udp_sock),
  54         .slab_flags        = SLAB_DESTROY_BY_RCU,
  55         .h.udp_table       = &udplite_table,
  56 #ifdef CONFIG_COMPAT
  57         .compat_setsockopt = compat_udp_setsockopt,
  58         .compat_getsockopt = compat_udp_getsockopt,
  59 #endif
  60         .clear_sk          = sk_prot_clear_portaddr_nulls,
  61 };
  62 EXPORT_SYMBOL(udplite_prot);
  63
  64 static struct inet_protosw udplite4_protosw = {
  65         .type           =  SOCK_DGRAM,
  66         .protocol       =  IPPROTO_UDPLITE,
  67         .prot           =  &udplite_prot,
  68         .ops            =  &inet_dgram_ops,
  69         .no_check       =  0,           /* must checksum (RFC 3828) */
  70         .flags          =  INET_PROTOSW_PERMANENT,
  71 };
  72
  73 #ifdef CONFIG_PROC_FS
  74 static struct udp_seq_afinfo udplite4_seq_afinfo = {
  75         .name           = "udplite",
  76         .family         = AF_INET,
  77         .udp_table      = &udplite_table,
  78         .seq_fops       = {
  79                 .owner  =       THIS_MODULE,
  80         },
  81         .seq_ops        = {
  82                 .show           = udp4_seq_show,
  83         },
  84 };
  85
  86 static int __net_init udplite4_proc_init_net(struct net *net)
  87 {
  88         return udp_proc_register(net, &udplite4_seq_afinfo);
  89 }
  90
  91 static void __net_exit udplite4_proc_exit_net(struct net *net)
  92 {
  93         udp_proc_unregister(net, &udplite4_seq_afinfo);
  94 }
  95
  96 static struct pernet_operations udplite4_net_ops = {
  97         .init = udplite4_proc_init_net,
  98         .exit = udplite4_proc_exit_net,
  99 };
 100
 101 static __init int udplite4_proc_init(void)
 102 {
 103         return register_pernet_subsys(&udplite4_net_ops);
 104 }
 105 #else
 106 static inline int udplite4_proc_init(void)
 107 {
 108         return 0;
 109 }
 110 #endif
 111
 112 void __init udplite4_register(void)
 113 {
 114         udp_table_init(&udplite_table, "UDP-Lite");
 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 }