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 /* Designate sk as UDP-Lite socket */ 21 static int udplite_sk_init(struct sock *sk) 22 { 23 udp_init_sock(sk); 24 pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, " 25 "please contact the netdev mailing list\n"); 26 return 0; 27 } 28 29 static int udplite_rcv(struct sk_buff *skb) 30 { 31 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 32 } 33 34 static int udplite_err(struct sk_buff *skb, u32 info) 35 { 36 return __udp4_lib_err(skb, info, &udplite_table); 37 } 38 39 static const struct net_protocol udplite_protocol = { 40 .handler = udplite_rcv, 41 .err_handler = udplite_err, 42 .no_policy = 1, 43 }; 44 45 struct proto udplite_prot = { 46 .name = "UDP-Lite", 47 .owner = THIS_MODULE, 48 .close = udp_lib_close, 49 .connect = ip4_datagram_connect, 50 .disconnect = udp_disconnect, 51 .ioctl = udp_ioctl, 52 .init = udplite_sk_init, 53 .destroy = udp_destroy_sock, 54 .setsockopt = udp_setsockopt, 55 .getsockopt = udp_getsockopt, 56 .sendmsg = udp_sendmsg, 57 .recvmsg = udp_recvmsg, 58 .hash = udp_lib_hash, 59 .unhash = udp_lib_unhash, 60 .rehash = udp_v4_rehash, 61 .get_port = udp_v4_get_port, 62 63 .memory_allocated = &udp_memory_allocated, 64 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 65 66 .sysctl_mem = sysctl_udp_mem, 67 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 68 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 69 .obj_size = sizeof(struct udp_sock), 70 .h.udp_table = &udplite_table, 71 }; 72 EXPORT_SYMBOL(udplite_prot); 73 74 static struct inet_protosw udplite4_protosw = { 75 .type = SOCK_DGRAM, 76 .protocol = IPPROTO_UDPLITE, 77 .prot = &udplite_prot, 78 .ops = &inet_dgram_ops, 79 .flags = INET_PROTOSW_PERMANENT, 80 }; 81 82 #ifdef CONFIG_PROC_FS 83 static struct udp_seq_afinfo udplite4_seq_afinfo = { 84 .family = AF_INET, 85 .udp_table = &udplite_table, 86 }; 87 88 static int __net_init udplite4_proc_init_net(struct net *net) 89 { 90 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops, 91 sizeof(struct udp_iter_state), &udplite4_seq_afinfo)) 92 return -ENOMEM; 93 return 0; 94 } 95 96 static void __net_exit udplite4_proc_exit_net(struct net *net) 97 { 98 remove_proc_entry("udplite", net->proc_net); 99 } 100 101 static struct pernet_operations udplite4_net_ops = { 102 .init = udplite4_proc_init_net, 103 .exit = udplite4_proc_exit_net, 104 }; 105 106 static __init int udplite4_proc_init(void) 107 { 108 return register_pernet_subsys(&udplite4_net_ops); 109 } 110 #else 111 static inline int udplite4_proc_init(void) 112 { 113 return 0; 114 } 115 #endif 116 117 void __init udplite4_register(void) 118 { 119 udp_table_init(&udplite_table, "UDP-Lite"); 120 if (proto_register(&udplite_prot, 1)) 121 goto out_register_err; 122 123 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 124 goto out_unregister_proto; 125 126 inet_register_protosw(&udplite4_protosw); 127 128 if (udplite4_proc_init()) 129 pr_err("%s: Cannot register /proc!\n", __func__); 130 return; 131 132 out_unregister_proto: 133 proto_unregister(&udplite_prot); 134 out_register_err: 135 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); 136 } 137