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 udp_sk(sk)->pcflag = UDPLITE_BIT; 25 pr_warn_once("UDP-Lite is deprecated and scheduled to be removed in 2025, " 26 "please contact the netdev mailing list\n"); 27 return 0; 28 } 29 30 static int udplite_rcv(struct sk_buff *skb) 31 { 32 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 33 } 34 35 static int udplite_err(struct sk_buff *skb, u32 info) 36 { 37 return __udp4_lib_err(skb, info, &udplite_table); 38 } 39 40 static const struct net_protocol udplite_protocol = { 41 .handler = udplite_rcv, 42 .err_handler = udplite_err, 43 .no_policy = 1, 44 }; 45 46 struct proto udplite_prot = { 47 .name = "UDP-Lite", 48 .owner = THIS_MODULE, 49 .close = udp_lib_close, 50 .connect = ip4_datagram_connect, 51 .disconnect = udp_disconnect, 52 .ioctl = udp_ioctl, 53 .init = udplite_sk_init, 54 .destroy = udp_destroy_sock, 55 .setsockopt = udp_setsockopt, 56 .getsockopt = udp_getsockopt, 57 .sendmsg = udp_sendmsg, 58 .recvmsg = udp_recvmsg, 59 .hash = udp_lib_hash, 60 .unhash = udp_lib_unhash, 61 .rehash = udp_v4_rehash, 62 .get_port = udp_v4_get_port, 63 64 .memory_allocated = &udp_memory_allocated, 65 .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, 66 67 .sysctl_mem = sysctl_udp_mem, 68 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), 69 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), 70 .obj_size = sizeof(struct udp_sock), 71 .h.udp_table = &udplite_table, 72 }; 73 EXPORT_SYMBOL(udplite_prot); 74 75 static struct inet_protosw udplite4_protosw = { 76 .type = SOCK_DGRAM, 77 .protocol = IPPROTO_UDPLITE, 78 .prot = &udplite_prot, 79 .ops = &inet_dgram_ops, 80 .flags = INET_PROTOSW_PERMANENT, 81 }; 82 83 #ifdef CONFIG_PROC_FS 84 static struct udp_seq_afinfo udplite4_seq_afinfo = { 85 .family = AF_INET, 86 .udp_table = &udplite_table, 87 }; 88 89 static int __net_init udplite4_proc_init_net(struct net *net) 90 { 91 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops, 92 sizeof(struct udp_iter_state), &udplite4_seq_afinfo)) 93 return -ENOMEM; 94 return 0; 95 } 96 97 static void __net_exit udplite4_proc_exit_net(struct net *net) 98 { 99 remove_proc_entry("udplite", net->proc_net); 100 } 101 102 static struct pernet_operations udplite4_net_ops = { 103 .init = udplite4_proc_init_net, 104 .exit = udplite4_proc_exit_net, 105 }; 106 107 static __init int udplite4_proc_init(void) 108 { 109 return register_pernet_subsys(&udplite4_net_ops); 110 } 111 #else 112 static inline int udplite4_proc_init(void) 113 { 114 return 0; 115 } 116 #endif 117 118 void __init udplite4_register(void) 119 { 120 udp_table_init(&udplite_table, "UDP-Lite"); 121 if (proto_register(&udplite_prot, 1)) 122 goto out_register_err; 123 124 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 125 goto out_unregister_proto; 126 127 inet_register_protosw(&udplite4_protosw); 128 129 if (udplite4_proc_init()) 130 pr_err("%s: Cannot register /proc!\n", __func__); 131 return; 132 133 out_unregister_proto: 134 proto_unregister(&udplite_prot); 135 out_register_err: 136 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); 137 } 138