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 };
  60 EXPORT_SYMBOL(udplite_prot);
  61
  62 static struct inet_protosw udplite4_protosw = {
  63         .type           =  SOCK_DGRAM,
  64         .protocol       =  IPPROTO_UDPLITE,
  65         .prot           =  &udplite_prot,
  66         .ops            =  &inet_dgram_ops,
  67         .flags          =  INET_PROTOSW_PERMANENT,
  68 };
  69
  70 #ifdef CONFIG_PROC_FS
  71 static struct udp_seq_afinfo udplite4_seq_afinfo = {
  72         .family         = AF_INET,
  73         .udp_table      = &udplite_table,
  74 };
  75
  76 static int __net_init udplite4_proc_init_net(struct net *net)
  77 {
  78         if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops,
  79                         sizeof(struct udp_iter_state), &udplite4_seq_afinfo))
  80                 return -ENOMEM;
  81         return 0;
  82 }
  83
  84 static void __net_exit udplite4_proc_exit_net(struct net *net)
  85 {
  86         remove_proc_entry("udplite", net->proc_net);
  87 }
  88
  89 static struct pernet_operations udplite4_net_ops = {
  90         .init = udplite4_proc_init_net,
  91         .exit = udplite4_proc_exit_net,
  92 };
  93
  94 static __init int udplite4_proc_init(void)
  95 {
  96         return register_pernet_subsys(&udplite4_net_ops);
  97 }
  98 #else
  99 static inline int udplite4_proc_init(void)
 100 {
 101         return 0;
 102 }
 103 #endif
 104
 105 void __init udplite4_register(void)
 106 {
 107         udp_table_init(&udplite_table, "UDP-Lite");
 108         if (proto_register(&udplite_prot, 1))
 109                 goto out_register_err;
 110
 111         if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0)
 112                 goto out_unregister_proto;
 113
 114         inet_register_protosw(&udplite4_protosw);
 115
 116         if (udplite4_proc_init())
 117                 pr_err("%s: Cannot register /proc!\n", __func__);
 118         return;
 119
 120 out_unregister_proto:
 121         proto_unregister(&udplite_prot);
 122 out_register_err:
 123         pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__);
 124 }