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 __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 DEFINE_PROTO_INUSE(udplite) 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 REF_PROTO_INUSE(udplite) 73 }; 74 75 static struct inet_protosw udplite4_protosw = { 76 .type = SOCK_DGRAM, 77 .protocol = IPPROTO_UDPLITE, 78 .prot = &udplite_prot, 79 .ops = &inet_dgram_ops, 80 .capability = -1, 81 .no_check = 0, /* must checksum (RFC 3828) */ 82 .flags = INET_PROTOSW_PERMANENT, 83 }; 84 85 #ifdef CONFIG_PROC_FS 86 static struct file_operations udplite4_seq_fops; 87 static struct udp_seq_afinfo udplite4_seq_afinfo = { 88 .owner = THIS_MODULE, 89 .name = "udplite", 90 .family = AF_INET, 91 .hashtable = udplite_hash, 92 .seq_show = udp4_seq_show, 93 .seq_fops = &udplite4_seq_fops, 94 }; 95 #endif 96 97 void __init udplite4_register(void) 98 { 99 if (proto_register(&udplite_prot, 1)) 100 goto out_register_err; 101 102 if (inet_add_protocol(&udplite_protocol, IPPROTO_UDPLITE) < 0) 103 goto out_unregister_proto; 104 105 inet_register_protosw(&udplite4_protosw); 106 107 #ifdef CONFIG_PROC_FS 108 if (udp_proc_register(&udplite4_seq_afinfo)) /* udplite4_proc_init() */ 109 printk(KERN_ERR "%s: Cannot register /proc!\n", __FUNCTION__); 110 #endif 111 return; 112 113 out_unregister_proto: 114 proto_unregister(&udplite_prot); 115 out_register_err: 116 printk(KERN_CRIT "%s: Cannot add UDP-Lite protocol.\n", __FUNCTION__); 117 } 118 119 EXPORT_SYMBOL(udplite_hash); 120 EXPORT_SYMBOL(udplite_prot); 121 EXPORT_SYMBOL(udplite_get_port); 122