net/ipv4/udplite.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  UDPLITE     An implementation of the UDP-Lite protocol (RFC 3828).
   4  *
   5  *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
   6  *
   7  *  Changes:
   8  *  Fixes:
   9  */
  10
  11 #define pr_fmt(fmt) "UDPLite: " fmt
  12
  13 #include <linux/export.h>
  14 #include <linux/proc_fs.h>
  15 #include "udp_impl.h"
  16
  17 struct udp_table        udplite_table __read_mostly;
  18 EXPORT_SYMBOL(udplite_table);
  19
  20 static int udplite_rcv(struct sk_buff *skb)
  21 {
  22         return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
  23 }
  24
  25 static int udplite_err(struct sk_buff *skb, u32 info)
  26 {
  27         return __udp4_lib_err(skb, info, &udplite_table);
  28 }
  29
  30 static const struct net_protocol udplite_protocol = {
  31         .handler        = udplite_rcv,
  32         .err_handler    = udplite_err,
  33         .no_policy      = 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         .hash              = udp_lib_hash,
  51         .unhash            = udp_lib_unhash,
  52         .rehash            = udp_v4_rehash,
  53         .get_port          = udp_v4_get_port,
  54         .memory_allocated  = &udp_memory_allocated,
  55         .sysctl_mem        = sysctl_udp_mem,
  56         .obj_size          = sizeof(struct udp_sock),
  57         .h.udp_table       = &udplite_table,
  58 };
  59 EXPORT_SYMBOL(udplite_prot);
  60
  61 static struct inet_protosw udplite4_protosw = {
  62         .type           =  SOCK_DGRAM,
  63         .protocol       =  IPPROTO_UDPLITE,
  64         .prot           =  &udplite_prot,
  65         .ops            =  &inet_dgram_ops,
  66         .flags          =  INET_PROTOSW_PERMANENT,
  67 };
  68
  69 #ifdef CONFIG_PROC_FS
  70 static struct udp_seq_afinfo udplite4_seq_afinfo = {
  71         .family         = AF_INET,
  72         .udp_table      = &udplite_table,
  73 };
  74
  75 static int __net_init udplite4_proc_init_net(struct net *net)
  76 {
  77         if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
  78                         sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
  79                 return -ENOMEM;
  80         return 0;
  81 }
  82
  83 static void __net_exit udplite4_proc_exit_net(struct net *net)
  84 {
  85         remove_proc_entry("udplite", net->proc_net);
  86 }
  87
  88 static struct pernet_operations udplite4_net_ops = {
  89         .init = udplite4_proc_init_net,
  90         .exit = udplite4_proc_exit_net,
  91 };
  92
  93 static __init int udplite4_proc_init(void)
  94 {
  95         return register_pernet_subsys(&udplite4_net_ops);
  96 }
  97 #else
  98 static inline int udplite4_proc_init(void)
  99 {
 100         return 0;
 101 }
 102 #endif
 103
 104 void __init udplite4_register(void)
 105 {
 106         udp_table_init(&udplite_table, "UDP-Lite");
 107         if (proto_register(&udplite_prot, 1))
 108                 goto out_register_err;
 109
 110         if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 111                 goto out_unregister_proto;
 112
 113         inet_register_protosw(&udplite4_protosw);
 114
 115         if (udplite4_proc_init())
 116                 pr_err("%s: Cannot register /proc!\n", __func__);
 117         return;
 118
 119 out_unregister_proto:
 120         proto_unregister(&udplite_prot);
 121 out_register_err:
 122         pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
 123 }