1 /* 2 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828). 3 * 4 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk> 5 * 6 * Changes: 7 * Fixes: 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 #define pr_fmt(fmt) "UDPLite: " fmt 15 16 #include <linux/export.h> 17 #include <linux/proc_fs.h> 18 #include "udp_impl.h" 19 20 struct udp_table udplite_table __read_mostly; 21 EXPORT_SYMBOL(udplite_table); 22 23 static int udplite_rcv(struct sk_buff *skb) 24 { 25 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 26 } 27 28 static void udplite_err(struct sk_buff *skb, u32 info) 29 { 30 __udp4_lib_err(skb, info, &udplite_table); 31 } 32 33 static const struct net_protocol udplite_protocol = { 34 .handler = udplite_rcv, 35 .err_handler = udplite_err, 36 .no_policy = 1, 37 .netns_ok = 1, 38 }; 39 40 struct proto udplite_prot = { 41 .name = "UDP-Lite", 42 .owner = THIS_MODULE, 43 .close = udp_lib_close, 44 .connect = ip4_datagram_connect, 45 .disconnect = udp_disconnect, 46 .ioctl = udp_ioctl, 47 .init = udplite_sk_init, 48 .destroy = udp_destroy_sock, 49 .setsockopt = udp_setsockopt, 50 .getsockopt = udp_getsockopt, 51 .sendmsg = udp_sendmsg, 52 .recvmsg = udp_recvmsg, 53 .sendpage = udp_sendpage, 54 .hash = udp_lib_hash, 55 .unhash = udp_lib_unhash, 56 .get_port = udp_v4_get_port, 57 .memory_allocated = &udp_memory_allocated, 58 .sysctl_mem = sysctl_udp_mem, 59 .obj_size = sizeof(struct udp_sock), 60 .h.udp_table = &udplite_table, 61 #ifdef CONFIG_COMPAT 62 .compat_setsockopt = compat_udp_setsockopt, 63 .compat_getsockopt = compat_udp_getsockopt, 64 #endif 65 }; 66 EXPORT_SYMBOL(udplite_prot); 67 68 static struct inet_protosw udplite4_protosw = { 69 .type = SOCK_DGRAM, 70 .protocol = IPPROTO_UDPLITE, 71 .prot = &udplite_prot, 72 .ops = &inet_dgram_ops, 73 .flags = INET_PROTOSW_PERMANENT, 74 }; 75 76 #ifdef CONFIG_PROC_FS 77 static struct udp_seq_afinfo udplite4_seq_afinfo = { 78 .family = AF_INET, 79 .udp_table = &udplite_table, 80 }; 81 82 static int __net_init udplite4_proc_init_net(struct net *net) 83 { 84 if (!proc_create_net_data("udplite", 0444, net->proc_net, &udp_seq_ops, 85 sizeof(struct udp_iter_state), &udplite4_seq_afinfo)) 86 return -ENOMEM; 87 return 0; 88 } 89 90 static void __net_exit udplite4_proc_exit_net(struct net *net) 91 { 92 remove_proc_entry("udplite", net->proc_net); 93 } 94 95 static struct pernet_operations udplite4_net_ops = { 96 .init = udplite4_proc_init_net, 97 .exit = udplite4_proc_exit_net, 98 }; 99 100 static __init int udplite4_proc_init(void) 101 { 102 return register_pernet_subsys(&udplite4_net_ops); 103 } 104 #else 105 static inline int udplite4_proc_init(void) 106 { 107 return 0; 108 } 109 #endif 110 111 void __init udplite4_register(void) 112 { 113 udp_table_init(&udplite_table, "UDP-Lite"); 114 if (proto_register(&udplite_prot, 1)) 115 goto out_register_err; 116 117 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 118 goto out_unregister_proto; 119 120 inet_register_protosw(&udplite4_protosw); 121 122 if (udplite4_proc_init()) 123 pr_err("%s: Cannot register /proc!\n", __func__); 124 return; 125 126 out_unregister_proto: 127 proto_unregister(&udplite_prot); 128 out_register_err: 129 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); 130 } 131