linux/net/ipv4/udplite.c
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   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 "udp_impl.h"
  18
  19struct udp_table        udplite_table __read_mostly;
  20EXPORT_SYMBOL(udplite_table);
  21
  22static int udplite_rcv(struct sk_buff *skb)
  23{
  24        return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
  25}
  26
  27static void udplite_err(struct sk_buff *skb, u32 info)
  28{
  29        __udp4_lib_err(skb, info, &udplite_table);
  30}
  31
  32static const struct net_protocol udplite_protocol = {
  33        .handler        = udplite_rcv,
  34        .err_handler    = udplite_err,
  35        .no_policy      = 1,
  36        .netns_ok       = 1,
  37};
  38
  39struct 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        .slab_flags        = SLAB_DESTROY_BY_RCU,
  59        .h.udp_table       = &udplite_table,
  60#ifdef CONFIG_COMPAT
  61        .compat_setsockopt = compat_udp_setsockopt,
  62        .compat_getsockopt = compat_udp_getsockopt,
  63#endif
  64        .clear_sk          = sk_prot_clear_portaddr_nulls,
  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        .no_check       =  0,           /* must checksum (RFC 3828) */
  74        .flags          =  INET_PROTOSW_PERMANENT,
  75};
  76
  77#ifdef CONFIG_PROC_FS
  78
  79static const struct file_operations udplite_afinfo_seq_fops = {
  80        .owner    = THIS_MODULE,
  81        .open     = udp_seq_open,
  82        .read     = seq_read,
  83        .llseek   = seq_lseek,
  84        .release  = seq_release_net
  85};
  86
  87static struct udp_seq_afinfo udplite4_seq_afinfo = {
  88        .name           = "udplite",
  89        .family         = AF_INET,
  90        .udp_table      = &udplite_table,
  91        .seq_fops       = &udplite_afinfo_seq_fops,
  92        .seq_ops        = {
  93                .show           = udp4_seq_show,
  94        },
  95};
  96
  97static int __net_init udplite4_proc_init_net(struct net *net)
  98{
  99        return udp_proc_register(net, &udplite4_seq_afinfo);
 100}
 101
 102static void __net_exit udplite4_proc_exit_net(struct net *net)
 103{
 104        udp_proc_unregister(net, &udplite4_seq_afinfo);
 105}
 106
 107static struct pernet_operations udplite4_net_ops = {
 108        .init = udplite4_proc_init_net,
 109        .exit = udplite4_proc_exit_net,
 110};
 111
 112static __init int udplite4_proc_init(void)
 113{
 114        return register_pernet_subsys(&udplite4_net_ops);
 115}
 116#else
 117static inline int udplite4_proc_init(void)
 118{
 119        return 0;
 120}
 121#endif
 122
 123void __init udplite4_register(void)
 124{
 125        udp_table_init(&udplite_table, "UDP-Lite");
 126        if (proto_register(&udplite_prot, 1))
 127                goto out_register_err;
 128
 129        if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 130                goto out_unregister_proto;
 131
 132        inet_register_protosw(&udplite4_protosw);
 133
 134        if (udplite4_proc_init())
 135                pr_err("%s: Cannot register /proc!\n", __func__);
 136        return;
 137
 138out_unregister_proto:
 139        proto_unregister(&udplite_prot);
 140out_register_err:
 141        pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
 142}
 143
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