net/ipv6/udplite.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  UDPLITEv6   An implementation of the UDP-Lite protocol over IPv6.
   4  *              See also net/ipv4/udplite.c
   5  *
   6  *  Authors:    Gerrit Renker       <gerrit@erg.abdn.ac.uk>
   7  *
   8  *  Changes:
   9  *  Fixes:
  10  */
  11 #define pr_fmt(fmt) "UDPLite6: " fmt
  12
  13 #include <linux/export.h>
  14 #include <linux/proc_fs.h>
  15 #include "udp_impl.h"
  16
  17 static int udplitev6_sk_init(struct sock *sk)
  18 {
  19         udpv6_init_sock(sk);
  20         pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, "
  21                      "please contact the netdev mailing list\n");
  22         return 0;
  23 }
  24
  25 static int udplitev6_rcv(struct sk_buff *skb)
  26 {
  27         return __udp6_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE);
  28 }
  29
  30 static int udplitev6_err(struct sk_buff *skb,
  31                           struct inet6_skb_parm *opt,
  32                           u8 type, u8 code, int offset, __be32 info)
  33 {
  34         return __udp6_lib_err(skb, opt, type, code, offset, info,
  35                               &udplite_table);
  36 }
  37
  38 static const struct inet6_protocol udplitev6_protocol = {
  39         .handler        =       udplitev6_rcv,
  40         .err_handler    =       udplitev6_err,
  41         .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
  42 };
  43
  44 struct proto udplitev6_prot = {
  45         .name              = "UDPLITEv6",
  46         .owner             = THIS_MODULE,
  47         .close             = udp_lib_close,
  48         .connect           = ip6_datagram_connect,
  49         .disconnect        = udp_disconnect,
  50         .ioctl             = udp_ioctl,
  51         .init              = udplitev6_sk_init,
  52         .destroy           = udpv6_destroy_sock,
  53         .setsockopt        = udpv6_setsockopt,
  54         .getsockopt        = udpv6_getsockopt,
  55         .sendmsg           = udpv6_sendmsg,
  56         .recvmsg           = udpv6_recvmsg,
  57         .hash              = udp_lib_hash,
  58         .unhash            = udp_lib_unhash,
  59         .rehash            = udp_v6_rehash,
  60         .get_port          = udp_v6_get_port,
  61
  62         .memory_allocated  = &udp_memory_allocated,
  63         .per_cpu_fw_alloc  = &udp_memory_per_cpu_fw_alloc,
  64
  65         .sysctl_mem        = sysctl_udp_mem,
  66         .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
  67         .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
  68         .obj_size          = sizeof(struct udp6_sock),
  69         .ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6),
  70         .h.udp_table       = &udplite_table,
  71 };
  72
  73 static struct inet_protosw udplite6_protosw = {
  74         .type           = SOCK_DGRAM,
  75         .protocol       = IPPROTO_UDPLITE,
  76         .prot           = &udplitev6_prot,
  77         .ops            = &inet6_dgram_ops,
  78         .flags          = INET_PROTOSW_PERMANENT,
  79 };
  80
  81 int __init udplitev6_init(void)
  82 {
  83         int ret;
  84
  85         ret = inet6_add_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
  86         if (ret)
  87                 goto out;
  88
  89         ret = inet6_register_protosw(&udplite6_protosw);
  90         if (ret)
  91                 goto out_udplitev6_protocol;
  92 out:
  93         return ret;
  94
  95 out_udplitev6_protocol:
  96         inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
  97         goto out;
  98 }
  99
 100 void udplitev6_exit(void)
 101 {
 102         inet6_unregister_protosw(&udplite6_protosw);
 103         inet6_del_protocol(&udplitev6_protocol, IPPROTO_UDPLITE);
 104 }
 105
 106 #ifdef CONFIG_PROC_FS
 107 static struct udp_seq_afinfo udplite6_seq_afinfo = {
 108         .family         = AF_INET6,
 109         .udp_table      = &udplite_table,
 110 };
 111
 112 static int __net_init udplite6_proc_init_net(struct net *net)
 113 {
 114         if (!proc_create_net_data("udplite6", 0444, net->proc_net,
 115                         &udp6_seq_ops, sizeof(struct udp_iter_state),
 116                         &udplite6_seq_afinfo))
 117                 return -ENOMEM;
 118         return 0;
 119 }
 120
 121 static void __net_exit udplite6_proc_exit_net(struct net *net)
 122 {
 123         remove_proc_entry("udplite6", net->proc_net);
 124 }
 125
 126 static struct pernet_operations udplite6_net_ops = {
 127         .init = udplite6_proc_init_net,
 128         .exit = udplite6_proc_exit_net,
 129 };
 130
 131 int __init udplite6_proc_init(void)
 132 {
 133         return register_pernet_subsys(&udplite6_net_ops);
 134 }
 135
 136 void udplite6_proc_exit(void)
 137 {
 138         unregister_pernet_subsys(&udplite6_net_ops);
 139 }
 140 #endif