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 int udplite_get_port(struct sock *sk, unsigned short p, 21 int (*c)(const struct sock *, const struct sock *)) 22 { 23 return __udp_lib_get_port(sk, p, udplite_hash, c); 24 } 25 26 static int udplite_v4_get_port(struct sock *sk, unsigned short snum) 27 { 28 return udplite_get_port(sk, snum, ipv4_rcv_saddr_equal); 29 } 30 31 static int udplite_rcv(struct sk_buff *skb) 32 { 33 return __udp4_lib_rcv(skb, udplite_hash, IPPROTO_UDPLITE); 34 } 35 36 static void udplite_err(struct sk_buff *skb, u32 info) 37 { 38 return __udp4_lib_err(skb, info, udplite_hash); 39 } 40 41 static struct net_protocol udplite_protocol = { 42 .handler = udplite_rcv, 43 .err_handler = udplite_err, 44 .no_policy = 1, 45 }; 46 47 struct proto udplite_prot = { 48 .name = "UDP-Lite", 49 .owner = THIS_MODULE, 50 .close = udp_lib_close, 51 .connect = ip4_datagram_connect, 52 .disconnect = udp_disconnect, 53 .ioctl = udp_ioctl, 54 .init = udplite_sk_init, 55 .destroy = udp_destroy_sock, 56 .setsockopt = udp_setsockopt, 57 .getsockopt = udp_getsockopt, 58 .sendmsg = udp_sendmsg, 59 .recvmsg = udp_recvmsg, 60 .sendpage = udp_sendpage, 61 .backlog_rcv = udp_queue_rcv_skb, 62 .hash = udp_lib_hash, 63 .unhash = udp_lib_unhash, 64 .get_port = udplite_v4_get_port, 65 .obj_size = sizeof(struct udp_sock), 66 #ifdef CONFIG_COMPAT 67 .compat_setsockopt = compat_udp_setsockopt, 68 .compat_getsockopt = compat_udp_getsockopt, 69 #endif 70 }; 71 72 static struct inet_protosw udplite4_protosw = { 73 .type = SOCK_DGRAM, 74 .protocol = IPPROTO_UDPLITE, 75 .prot = &udplite_prot, 76 .ops = &inet_dgram_ops, 77 .capability = -1, 78 .no_check = 0, /* must checksum (RFC 3828) */ 79 .flags = INET_PROTOSW_PERMANENT, 80 }; 81 82 #ifdef CONFIG_PROC_FS 83 static struct file_operations udplite4_seq_fops; 84 static struct udp_seq_afinfo udplite4_seq_afinfo = { 85 .owner = THIS_MODULE, 86 .name = "udplite", 87 .family = AF_INET, 88 .hashtable = udplite_hash, 89 .seq_show = udp4_seq_show, 90 .seq_fops = &udplite4_seq_fops, 91 }; 92 #endif 93 94 void __init udplite4_register(void) 95 { 96 if (proto_register(&udplite_prot, 1)) 97 goto out_register_err; 98 99 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 100 goto out_unregister_proto; 101 102 inet_register_protosw(&udplite4_protosw); 103 104 #ifdef CONFIG_PROC_FS 105 if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */ 106 printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__); 107 #endif 108 return; 109 110 out_unregister_proto: 111 proto_unregister(&udplite_prot); 112 out_register_err: 113 printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__); 114 } 115 116 EXPORT_SYMBOL(udplite_hash); 117 EXPORT_SYMBOL(udplite_prot); 118 EXPORT_SYMBOL(udplite_get_port); 119