| 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", __func__); |
| 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", __func__); |
| 117 | } |
| 118 | |
| 119 | EXPORT_SYMBOL(udplite_hash); |
| 120 | EXPORT_SYMBOL(udplite_prot); |
| 121 | EXPORT_SYMBOL(udplite_get_port); |