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 "udp_impl.h" 18 19 struct udp_table udplite_table __read_mostly; 20 EXPORT_SYMBOL(udplite_table); 21 22 static int udplite_rcv(struct sk_buff *skb) 23 { 24 return __udp4_lib_rcv(skb, &udplite_table, IPPROTO_UDPLITE); 25 } 26 27 static void udplite_err(struct sk_buff *skb, u32 info) 28 { 29 __udp4_lib_err(skb, info, &udplite_table); 30 } 31 32 static const struct net_protocol udplite_protocol = { 33 .handler = udplite_rcv, 34 .err_handler = udplite_err, 35 .no_policy = 1, 36 .netns_ok = 1, 37 }; 38 39 struct proto udplite_prot = { 40 .name = "UDP-Lite", 41 .owner = THIS_MODULE, 42 .close = udp_lib_close, 43 .connect = ip4_datagram_connect, 44 .disconnect = udp_disconnect, 45 .ioctl = udp_ioctl, 46 .init = udplite_sk_init, 47 .destroy = udp_destroy_sock, 48 .setsockopt = udp_setsockopt, 49 .getsockopt = udp_getsockopt, 50 .sendmsg = udp_sendmsg, 51 .recvmsg = udp_recvmsg, 52 .sendpage = udp_sendpage, 53 .backlog_rcv = udp_queue_rcv_skb, 54 .hash = udp_lib_hash, 55 .unhash = udp_lib_unhash, 56 .get_port = udp_v4_get_port, 57 .obj_size = sizeof(struct udp_sock), 58 .h.udp_table = &udplite_table, 59 #ifdef CONFIG_COMPAT 60 .compat_setsockopt = compat_udp_setsockopt, 61 .compat_getsockopt = compat_udp_getsockopt, 62 #endif 63 }; 64 EXPORT_SYMBOL(udplite_prot); 65 66 static struct inet_protosw udplite4_protosw = { 67 .type = SOCK_DGRAM, 68 .protocol = IPPROTO_UDPLITE, 69 .prot = &udplite_prot, 70 .ops = &inet_dgram_ops, 71 .flags = INET_PROTOSW_PERMANENT, 72 }; 73 74 #ifdef CONFIG_PROC_FS 75 76 static const struct file_operations udplite_afinfo_seq_fops = { 77 .owner = THIS_MODULE, 78 .open = udp_seq_open, 79 .read = seq_read, 80 .llseek = seq_lseek, 81 .release = seq_release_net 82 }; 83 84 static struct udp_seq_afinfo udplite4_seq_afinfo = { 85 .name = "udplite", 86 .family = AF_INET, 87 .udp_table = &udplite_table, 88 .seq_fops = &udplite_afinfo_seq_fops, 89 .seq_ops = { 90 .show = udp4_seq_show, 91 }, 92 }; 93 94 static int __net_init udplite4_proc_init_net(struct net *net) 95 { 96 return udp_proc_register(net, &udplite4_seq_afinfo); 97 } 98 99 static void __net_exit udplite4_proc_exit_net(struct net *net) 100 { 101 udp_proc_unregister(net, &udplite4_seq_afinfo); 102 } 103 104 static struct pernet_operations udplite4_net_ops = { 105 .init = udplite4_proc_init_net, 106 .exit = udplite4_proc_exit_net, 107 }; 108 109 static __init int udplite4_proc_init(void) 110 { 111 return register_pernet_subsys(&udplite4_net_ops); 112 } 113 #else 114 static inline int udplite4_proc_init(void) 115 { 116 return 0; 117 } 118 #endif 119 120 void __init udplite4_register(void) 121 { 122 udp_table_init(&udplite_table, "UDP-Lite"); 123 if (proto_register(&udplite_prot, 1)) 124 goto out_register_err; 125 126 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 127 goto out_unregister_proto; 128 129 inet_register_protosw(&udplite4_protosw); 130 131 if (udplite4_proc_init()) 132 pr_err("%s: Cannot register /proc!\n", __func__); 133 return; 134 135 out_unregister_proto: 136 proto_unregister(&udplite_prot); 137 out_register_err: 138 pr_crit("%s: Cannot add UDP-Lite protocol\n", __func__); 139 } 140