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 static int udplite_port_rover; 20 21 int udplite_get_port(struct sock *sk, unsigned short p, 22 const struct udp_get_port_ops *ops) 23 { 24 return __udp_lib_get_port(sk, p, udplite_hash, 25 &udplite_port_rover, ops); 26 } 27 28 static int udplite_v4_get_port(struct sock *sk, unsigned short snum) 29 { 30 return udplite_get_port(sk, snum, &udp_ipv4_ops); 31 } 32 33 static int udplite_rcv(struct sk_buff *skb) 34 { 35 return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE); 36 } 37 38 static void udplite_err(struct sk_buff *skb, u32 info) 39 { 40 return __udp4_lib_err(skb, info, udplite_hash); 41 } 42 43 static struct net_protocol udplite_protocol = { 44 .handler = udplite_rcv, 45 .err_handler = udplite_err, 46 .no_policy = 1, 47 }; 48 49 struct proto udplite_prot = { 50 .name = "UDP-Lite", 51 .owner = THIS_MODULE, 52 .close = udp_lib_close, 53 .connect = ip4_datagram_connect, 54 .disconnect = udp_disconnect, 55 .ioctl = udp_ioctl, 56 .init = udplite_sk_init, 57 .destroy = udp_destroy_sock, 58 .setsockopt = udp_setsockopt, 59 .getsockopt = udp_getsockopt, 60 .sendmsg = udp_sendmsg, 61 .recvmsg = udp_recvmsg, 62 .sendpage = udp_sendpage, 63 .backlog_rcv = udp_queue_rcv_skb, 64 .hash = udp_lib_hash, 65 .unhash = udp_lib_unhash, 66 .get_port = udplite_v4_get_port, 67 .obj_size = sizeof(struct udp_sock), 68 #ifdef CONFIG_COMPAT 69 .compat_setsockopt = compat_udp_setsockopt, 70 .compat_getsockopt = compat_udp_getsockopt, 71 #endif 72 }; 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 .capability = -1, 80 .no_check = 0, /* must checksum (RFC 3828) */ 81 .flags = INET_PROTOSW_PERMANENT, 82 }; 83 84 #ifdef CONFIG_PROC_FS 85 static struct file_operations udplite4_seq_fops; 86 static struct udp_seq_afinfo udplite4_seq_afinfo = { 87 .owner = THIS_MODULE, 88 .name = "udplite", 89 .family = AF_INET, 90 .hashtable = udplite_hash, 91 .seq_show = udp4_seq_show, 92 .seq_fops = &udplite4_seq_fops, 93 }; 94 #endif 95 96 void __init udplite4_register(void) 97 { 98 if (proto_register(&udplite_prot, 1)) 99 goto out_register_err; 100 101 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 102 goto out_unregister_proto; 103 104 inet_register_protosw(&udplite4_protosw); 105 106 #ifdef CONFIG_PROC_FS 107 if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */ 108 printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__); 109 #endif 110 return; 111 112 out_unregister_proto: 113 proto_unregister(&udplite_prot); 114 out_register_err: 115 printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__); 116 } 117 118 EXPORT_SYMBOL(udplite_hash); 119 EXPORT_SYMBOL(udplite_prot); 120 EXPORT_SYMBOL(udplite_get_port); 121