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 <linux/export.h>
  14 #include "udp_impl.h"
  15
  16 struct udp_table        udplite_table __read_mostly;
  17 EXPORT_SYMBOL(udplite_table);
  18
  19 static int udplite_rcv(struct sk_buff *skb)
  20 {
  21         return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
  22 }
  23
  24 static void udplite_err(struct sk_buff *skb, u32 info)
  25 {
  26         __udp4_lib_err(skb, info, &udplite_table);
  27 }
  28
  29 static const struct net_protocol udplite_protocol = {
  30         .handler        = udplite_rcv,
  31         .err_handler    = udplite_err,
  32         .no_policy      = 1,
  33         .netns_ok       = 1,
  34 };
  35
  36 struct proto    udplite_prot = {
  37         .name              = "UDP-Lite",
  38         .owner             = THIS_MODULE,
  39         .close             = udp_lib_close,
  40         .connect           = ip4_datagram_connect,
  41         .disconnect        = udp_disconnect,
  42         .ioctl             = udp_ioctl,
  43         .init              = udplite_sk_init,
  44         .destroy           = udp_destroy_sock,
  45         .setsockopt        = udp_setsockopt,
  46         .getsockopt        = udp_getsockopt,
  47         .sendmsg           = udp_sendmsg,
  48         .recvmsg           = udp_recvmsg,
  49         .sendpage          = udp_sendpage,
  50         .backlog_rcv       = udp_queue_rcv_skb,
  51         .hash              = udp_lib_hash,
  52         .unhash            = udp_lib_unhash,
  53         .get_port          = udp_v4_get_port,
  54         .obj_size          = sizeof(struct udp_sock),
  55         .slab_flags        = SLAB_DESTROY_BY_RCU,
  56         .h.udp_table       = &udplite_table,
  57 #ifdef CONFIG_COMPAT
  58         .compat_setsockopt = compat_udp_setsockopt,
  59         .compat_getsockopt = compat_udp_getsockopt,
  60 #endif
  61         .clear_sk          = sk_prot_clear_portaddr_nulls,
  62 };
  63 EXPORT_SYMBOL(udplite_prot);
  64
  65 static struct inet_protosw udplite4_protosw = {
  66         .type           =  SOCK_DGRAM,
  67         .protocol       =  IPPROTO_UDPLITE,
  68         .prot           =  &udplite_prot,
  69         .ops            =  &inet_dgram_ops,
  70         .no_check       =  0,           /* must checksum (RFC 3828) */
  71         .flags          =  INET_PROTOSW_PERMANENT,
  72 };
  73
  74 #ifdef CONFIG_PROC_FS
  75
  76 static const struct file_operations udplite_afinfo_seq_fops = {
  77         .owner    = THIS_MODULE,
  78         .open     = udp_seq_open,
  79         .read     = seq_read,
  80         .llseek   = seq_lseek,
  81         .release  = seq_release_net
  82 };
  83
  84 static struct udp_seq_afinfo udplite4_seq_afinfo = {
  85         .name           = "udplite",
  86         .family         = AF_INET,
  87         .udp_table      = &udplite_table,
  88         .seq_fops       = &udplite_afinfo_seq_fops,
  89         .seq_ops        = {
  90                 .show           = udp4_seq_show,
  91         },
  92 };
  93
  94 static int __net_init udplite4_proc_init_net(struct net *net)
  95 {
  96         return udp_proc_register(net, &udplite4_seq_afinfo);
  97 }
  98
  99 static void __net_exit udplite4_proc_exit_net(struct net *net)
 100 {
 101         udp_proc_unregister(net, &udplite4_seq_afinfo);
 102 }
 103
 104 static struct pernet_operations udplite4_net_ops = {
 105         .init = udplite4_proc_init_net,
 106         .exit = udplite4_proc_exit_net,
 107 };
 108
 109 static __init int udplite4_proc_init(void)
 110 {
 111         return register_pernet_subsys(&udplite4_net_ops);
 112 }
 113 #else
 114 static inline int udplite4_proc_init(void)
 115 {
 116         return 0;
 117 }
 118 #endif
 119
 120 void __init udplite4_register(void)
 121 {
 122         udp_table_init(&udplite_table, "UDP-Lite");
 123         if (proto_register(&udplite_prot, 1))
 124                 goto out_register_err;
 125
 126         if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 127                 goto out_unregister_proto;
 128
 129         inet_register_protosw(&udplite4_protosw);
 130
 131         if (udplite4_proc_init())
 132                 printk(KERN_ERR "%s: Cannot register /proc!\n", __func__);
 133         return;
 134
 135 out_unregister_proto:
 136         proto_unregister(&udplite_prot);
 137 out_register_err:
 138         printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__);
 139 }