LXR linux/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
  15struct udp_table        udplite_table;
  16EXPORT_SYMBOL(udplite_table);
  17
  18static int udplite_rcv(struct sk_buff *skb)
  19{
  20        return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
  21}
  22
  23static void udplite_err(struct sk_buff *skb, u32 info)
  24{
  25        __udp4_lib_err(skb, info, &udplite_table);
  26}
  27
  28static 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
  35struct 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};
  61
  62static struct inet_protosw udplite4_protosw = {
  63        .type           =  SOCK_DGRAM,
  64        .protocol       =  IPPROTO_UDPLITE,
  65        .prot           =  &udplite_prot,
  66        .ops            =  &inet_dgram_ops,
  67        .capability     = -1,
  68        .no_check       =  0,           /* must checksum (RFC 3828) */
  69        .flags          =  INET_PROTOSW_PERMANENT,
  70};
  71
  72#ifdef CONFIG_PROC_FS
  73static struct udp_seq_afinfo udplite4_seq_afinfo = {
  74        .name           = "udplite",
  75        .family         = AF_INET,
  76        .udp_table      = &udplite_table,
  77        .seq_fops       = {
  78                .owner  =       THIS_MODULE,
  79        },
  80        .seq_ops        = {
  81                .show           = udp4_seq_show,
  82        },
  83};
  84
  85static int udplite4_proc_init_net(struct net *net)
  86{
  87        return udp_proc_register(net, &udplite4_seq_afinfo);
  88}
  89
  90static void udplite4_proc_exit_net(struct net *net)
  91{
  92        udp_proc_unregister(net, &udplite4_seq_afinfo);
  93}
  94
  95static struct pernet_operations udplite4_net_ops = {
  96        .init = udplite4_proc_init_net,
  97        .exit = udplite4_proc_exit_net,
  98};
  99
 100static __init int udplite4_proc_init(void)
 101{
 102        return register_pernet_subsys(&udplite4_net_ops);
 103}
 104#else
 105static inline int udplite4_proc_init(void)
 106{
 107        return 0;
 108}
 109#endif
 110
 111void __init udplite4_register(void)
 112{
 113        udp_table_init(&udplite_table);
 114        if (proto_register(&udplite_prot, 1))
 115                goto out_register_err;
 116
 117        if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 118                goto out_unregister_proto;
 119
 120        inet_register_protosw(&udplite4_protosw);
 121
 122        if (udplite4_proc_init())
 123                printk(KERN_ERR "%s: Cannot register /proc!\n", __func__);
 124        return;
 125
 126out_unregister_proto:
 127        proto_unregister(&udplite_prot);
 128out_register_err:
 129        printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
 130}
 131
 132EXPORT_SYMBOL(udplite_prot);
 133