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         .netns_ok       = 1,
  35 };
  36
  37 struct proto    udplite_prot = {
  38         .name              = "UDP-Lite",
  39         .owner             = THIS_MODULE,
  40         .close             = udp_lib_close,
  41         .connect           = ip4_datagram_connect,
  42         .disconnect        = udp_disconnect,
  43         .ioctl             = udp_ioctl,
  44         .init              = udplite_sk_init,
  45         .destroy           = udp_destroy_sock,
  46         .setsockopt        = udp_setsockopt,
  47         .getsockopt        = udp_getsockopt,
  48         .sendmsg           = udp_sendmsg,
  49         .recvmsg           = udp_recvmsg,
  50         .sendpage          = udp_sendpage,
  51         .hash              = udp_lib_hash,
  52         .unhash            = udp_lib_unhash,
  53         .rehash            = udp_v4_rehash,
  54         .get_port          = udp_v4_get_port,
  55         .memory_allocated  = &udp_memory_allocated,
  56         .sysctl_mem        = sysctl_udp_mem,
  57         .obj_size          = sizeof(struct udp_sock),
  58         .h.udp_table       = &udplite_table,
  59 #ifdef CONFIG_COMPAT
  60         .compat_setsockopt = compat_udp_setsockopt,
  61         .compat_getsockopt = compat_udp_getsockopt,
  62 #endif
  63 };
  64 EXPORT_SYMBOL(udplite_prot);
  65
  66 static struct inet_protosw udplite4_protosw = {
  67         .type           =  SOCK_DGRAM,
  68         .protocol       =  IPPROTO_UDPLITE,
  69         .prot           =  &udplite_prot,
  70         .ops            =  &inet_dgram_ops,
  71         .flags          =  INET_PROTOSW_PERMANENT,
  72 };
  73
  74 #ifdef CONFIG_PROC_FS
  75 static struct udp_seq_afinfo udplite4_seq_afinfo = {
  76         .family         = AF_INET,
  77         .udp_table      = &udplite_table,
  78 };
  79
  80 static int __net_init udplite4_proc_init_net(struct net *net)
  81 {
  82         if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
  83                         sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
  84                 return -ENOMEM;
  85         return 0;
  86 }
  87
  88 static void __net_exit udplite4_proc_exit_net(struct net *net)
  89 {
  90         remove_proc_entry("udplite", net->proc_net);
  91 }
  92
  93 static struct pernet_operations udplite4_net_ops = {
  94         .init = udplite4_proc_init_net,
  95         .exit = udplite4_proc_exit_net,
  96 };
  97
  98 static __init int udplite4_proc_init(void)
  99 {
 100         return register_pernet_subsys(&udplite4_net_ops);
 101 }
 102 #else
 103 static inline int udplite4_proc_init(void)
 104 {
 105         return 0;
 106 }
 107 #endif
 108
 109 void __init udplite4_register(void)
 110 {
 111         udp_table_init(&udplite_table, "UDP-Lite");
 112         if (proto_register(&udplite_prot, 1))
 113                 goto out_register_err;
 114
 115         if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 116                 goto out_unregister_proto;
 117
 118         inet_register_protosw(&udplite4_protosw);
 119
 120         if (udplite4_proc_init())
 121                 pr_err("%s: Cannot register /proc!\n", __func__);
 122         return;
 123
 124 out_unregister_proto:
 125         proto_unregister(&udplite_prot);
 126 out_register_err:
 127         pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
 128 }