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
  20 struct udp_table        udplite_table __read_mostly;
  21 EXPORT_SYMBOL(udplite_table);
  22
  23 static int udplite_rcv(struct sk_buff *skb)
  24 {
  25         return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
  26 }
  27
  28 static void udplite_err(struct sk_buff *skb, u32 info)
  29 {
  30         __udp4_lib_err(skb, info, &udplite_table);
  31 }
  32
  33 static 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
  40 struct 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 };
  66 EXPORT_SYMBOL(udplite_prot);
  67
  68 static 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
  77 static struct udp_seq_afinfo udplite4_seq_afinfo = {
  78         .family         = AF_INET,
  79         .udp_table      = &udplite_table,
  80 };
  81
  82 static 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
  90 static void __net_exit udplite4_proc_exit_net(struct net *net)
  91 {
  92         remove_proc_entry("udplite", net->proc_net);
  93 }
  94
  95 static struct pernet_operations udplite4_net_ops = {
  96         .init = udplite4_proc_init_net,
  97         .exit = udplite4_proc_exit_net,
  98 };
  99
 100 static __init int udplite4_proc_init(void)
 101 {
 102         return register_pernet_subsys(&udplite4_net_ops);
 103 }
 104 #else
 105 static inline int udplite4_proc_init(void)
 106 {
 107         return 0;
 108 }
 109 #endif
 110
 111 void __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
 126 out_unregister_proto:
 127         proto_unregister(&udplite_prot);
 128 out_register_err:
 129         pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
 130 }