1 /* 2 * UDPLITE An implementation of the UDP-Lite protocol (RFC 3828). 3 * 4 * Version: $Id: udplite.c,v 1.25 2006/10/19 07:22:36 gerrit Exp $ 5 * 6 * Authors: Gerrit Renker <gerrit@erg.abdn.ac.uk> 7 * 8 * Changes: 9 * Fixes: 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 #include "udp_impl.h" 16 DEFINE_SNMP_STAT(struct udp_mib, udplite_statistics) __read_mostly; 17 18 struct hlist_head udplite_hash[UDP_HTABLE_SIZE]; 19 20 static int udplite_rcv(struct sk_buff *skb) 21 { 22 return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE); 23 } 24 25 static void udplite_err(struct sk_buff *skb, u32 info) 26 { 27 __udp4_lib_err(skb, info, udplite_hash); 28 } 29 30 static struct net_protocol udplite_protocol = { 31 .handler = udplite_rcv, 32 .err_handler = udplite_err, 33 .no_policy = 1, 34 .netns_ok = 1, 35 }; 36 37 struct proto udplite_prot = { 38 .name = "UDP-Lite", 39 .owner = THIS_MODULE, 40 .close = udp_lib_close, 41 .connect = ip4_datagram_connect, 42 .disconnect = udp_disconnect, 43 .ioctl = udp_ioctl, 44 .init = udplite_sk_init, 45 .destroy = udp_destroy_sock, 46 .setsockopt = udp_setsockopt, 47 .getsockopt = udp_getsockopt, 48 .sendmsg = udp_sendmsg, 49 .recvmsg = udp_recvmsg, 50 .sendpage = udp_sendpage, 51 .backlog_rcv = udp_queue_rcv_skb, 52 .hash = udp_lib_hash, 53 .unhash = udp_lib_unhash, 54 .get_port = udp_v4_get_port, 55 .obj_size = sizeof(struct udp_sock), 56 .h.udp_hash = udplite_hash, 57 #ifdef CONFIG_COMPAT 58 .compat_setsockopt = compat_udp_setsockopt, 59 .compat_getsockopt = compat_udp_getsockopt, 60 #endif 61 }; 62 63 static struct inet_protosw udplite4_protosw = { 64 .type = SOCK_DGRAM, 65 .protocol = IPPROTO_UDPLITE, 66 .prot = &udplite_prot, 67 .ops = &inet_dgram_ops, 68 .capability = -1, 69 .no_check = 0, /* must checksum (RFC 3828) */ 70 .flags = INET_PROTOSW_PERMANENT, 71 }; 72 73 #ifdef CONFIG_PROC_FS 74 static struct udp_seq_afinfo udplite4_seq_afinfo = { 75 .name = "udplite", 76 .family = AF_INET, 77 .hashtable = udplite_hash, 78 .seq_fops = { 79 .owner = THIS_MODULE, 80 }, 81 .seq_ops = { 82 .show = udp4_seq_show, 83 }, 84 }; 85 86 static int udplite4_proc_init_net(struct net *net) 87 { 88 return udp_proc_register(net, &udplite4_seq_afinfo); 89 } 90 91 static void udplite4_proc_exit_net(struct net *net) 92 { 93 udp_proc_unregister(net, &udplite4_seq_afinfo); 94 } 95 96 static struct pernet_operations udplite4_net_ops = { 97 .init = udplite4_proc_init_net, 98 .exit = udplite4_proc_exit_net, 99 }; 100 101 static __init int udplite4_proc_init(void) 102 { 103 return register_pernet_subsys(&udplite4_net_ops); 104 } 105 #else 106 static inline int udplite4_proc_init(void) 107 { 108 return 0; 109 } 110 #endif 111 112 void __init udplite4_register(void) 113 { 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 printk(KERN_ERR "%s: Cannot register /proc!\n", __func__); 124 return; 125 126 out_unregister_proto: 127 proto_unregister(&udplite_prot); 128 out_register_err: 129 printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __func__); 130 } 131 132 EXPORT_SYMBOL(udplite_hash); 133 EXPORT_SYMBOL(udplite_prot); 134