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 int (*c)(const struct sock *, const struct sock *)) 23 { 24 return __udp_lib_get_port(sk, p, udplite_hash, &udplite_port_rover, c); 25 } 26 27 static int udplite_v4_get_port(struct sock *sk, unsigned short snum) 28 { 29 return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal); 30 } 31 32 static int udplite_rcv(struct sk_buff *skb) 33 { 34 return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE); 35 } 36 37 static void udplite_err(struct sk_buff *skb, u32 info) 38 { 39 return __udp4_lib_err(skb, info, udplite_hash); 40 } 41 42 static struct net_protocol udplite_protocol = { 43 .handler = udplite_rcv, 44 .err_handler = udplite_err, 45 .no_policy = 1, 46 }; 47 48 struct proto udplite_prot = { 49 .name = "UDP-Lite", 50 .owner = THIS_MODULE, 51 .close = udp_lib_close, 52 .connect = ip4_datagram_connect, 53 .disconnect = udp_disconnect, 54 .ioctl = udp_ioctl, 55 .init = udplite_sk_init, 56 .destroy = udp_destroy_sock, 57 .setsockopt = udp_setsockopt, 58 .getsockopt = udp_getsockopt, 59 .sendmsg = udp_sendmsg, 60 .recvmsg = udp_recvmsg, 61 .sendpage = udp_sendpage, 62 .backlog_rcv = udp_queue_rcv_skb, 63 .hash = udp_lib_hash, 64 .unhash = udp_lib_unhash, 65 .get_port = udplite_v4_get_port, 66 .obj_size = sizeof(struct udp_sock), 67 #ifdef CONFIG_COMPAT 68 .compat_setsockopt = compat_udp_setsockopt, 69 .compat_getsockopt = compat_udp_getsockopt, 70 #endif 71 }; 72 73 static struct inet_protosw udplite4_protosw = { 74 .type = SOCK_DGRAM, 75 .protocol = IPPROTO_UDPLITE, 76 .prot = &udplite_prot, 77 .ops = &inet_dgram_ops, 78 .capability = -1, 79 .no_check = 0, /* must checksum (RFC 3828) */ 80 .flags = INET_PROTOSW_PERMANENT, 81 }; 82 83 #ifdef CONFIG_PROC_FS 84 static struct file_operations udplite4_seq_fops; 85 static struct udp_seq_afinfo udplite4_seq_afinfo = { 86 .owner = THIS_MODULE, 87 .name = "udplite", 88 .family = AF_INET, 89 .hashtable = udplite_hash, 90 .seq_show = udp4_seq_show, 91 .seq_fops = &udplite4_seq_fops, 92 }; 93 #endif 94 95 void __init udplite4_register(void) 96 { 97 if (proto_register(&udplite_prot, 1)) 98 goto out_register_err; 99 100 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 101 goto out_unregister_proto; 102 103 inet_register_protosw(&udplite4_protosw); 104 105 #ifdef CONFIG_PROC_FS 106 if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */ 107 printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__); 108 #endif 109 return; 110 111 out_unregister_proto: 112 proto_unregister(&udplite_prot); 113 out_register_err: 114 printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__); 115 } 116 117 EXPORT_SYMBOL(udplite_hash); 118 EXPORT_SYMBOL(udplite_prot); 119 EXPORT_SYMBOL(udplite_get_port); 120