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
  14#define pr_fmt(fmt) "UDPLite: " fmt
  15
  16#include <linux/export.h>
  17#include <linux/proc_fs.h>
  18#include "udp_impl.h"
  19
  20struct udp_table        udplite_table __read_mostly;
  21EXPORT_SYMBOL(udplite_table);
  22
  23static int udplite_rcv(struct sk_buff *skb)
  24{
  25        return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
  26}
  27
  28static void udplite_err(struct sk_buff *skb, u32 info)
  29{
  30        __udp4_lib_err(skb, info, &udplite_table);
  31}
  32
  33static const struct net_protocol udplite_protocol = {
  34        .handler        = udplite_rcv,
  35        .err_handler    = udplite_err,
  36        .no_policy      = 1,
  37        .netns_ok       = 1,
  38};
  39
  40struct proto    udplite_prot = {
  41        .name              = "UDP-Lite",
  42        .owner             = THIS_MODULE,
  43        .close             = udp_lib_close,
  44        .connect           = ip4_datagram_connect,
  45        .disconnect        = udp_disconnect,
  46        .ioctl             = udp_ioctl,
  47        .init              = udplite_sk_init,
  48        .destroy           = udp_destroy_sock,
  49        .setsockopt        = udp_setsockopt,
  50        .getsockopt        = udp_getsockopt,
  51        .sendmsg           = udp_sendmsg,
  52        .recvmsg           = udp_recvmsg,
  53        .sendpage          = udp_sendpage,
  54        .hash              = udp_lib_hash,
  55        .unhash            = udp_lib_unhash,
  56        .get_port          = udp_v4_get_port,
  57        .memory_allocated  = &udp_memory_allocated,
  58        .sysctl_mem        = sysctl_udp_mem,
  59        .obj_size          = sizeof(struct udp_sock),
  60        .h.udp_table       = &udplite_table,
  61#ifdef CONFIG_COMPAT
  62        .compat_setsockopt = compat_udp_setsockopt,
  63        .compat_getsockopt = compat_udp_getsockopt,
  64#endif
  65};
  66EXPORT_SYMBOL(udplite_prot);
  67
  68static struct inet_protosw udplite4_protosw = {
  69        .type           =  SOCK_DGRAM,
  70        .protocol       =  IPPROTO_UDPLITE,
  71        .prot           =  &udplite_prot,
  72        .ops            =  &inet_dgram_ops,
  73        .flags          =  INET_PROTOSW_PERMANENT,
  74};
  75
  76#ifdef CONFIG_PROC_FS
  77static struct udp_seq_afinfo udplite4_seq_afinfo = {
  78        .family         = AF_INET,
  79        .udp_table      = &udplite_table,
  80};
  81
  82static int __net_init udplite4_proc_init_net(struct net *net)
  83{
  84        if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
  85                        sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
  86                return -ENOMEM;
  87        return 0;
  88}
  89
  90static void __net_exit udplite4_proc_exit_net(struct net *net)
  91{
  92        remove_proc_entry("udplite", net->proc_net);
  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, "UDP-Lite");
 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                pr_err("%s: Cannot register /proc!\n", __func__);
 124        return;
 125
 126out_unregister_proto:
 127        proto_unregister(&udplite_prot);
 128out_register_err:
 129        pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
 130}
 131