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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the UDP module.
7 *
8 * Version: @(#)udp.h 1.0.2 05/07/93
9 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * Fixes:
14 * Alan Cox : Turned on udp checksums. I don't want to
15 * chase 'memory corruption' bugs that aren't!
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 */
22#ifndef _UDP_H
23#define _UDP_H
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/list.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020026#include <net/inet_sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <net/sock.h>
28#include <net/snmp.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080029#include <net/ip.h>
30#include <linux/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/seq_file.h>
Al Virobd01f842006-10-19 17:23:57 -040032#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080034/**
35 * struct udp_skb_cb - UDP(-Lite) private variables
36 *
37 * @header: private variables used by IPv4/IPv6
38 * @cscov: checksum coverage length (UDP-Lite only)
39 * @partial_cov: if set indicates partial csum coverage
40 */
41struct udp_skb_cb {
42 union {
43 struct inet_skb_parm h4;
44#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
45 struct inet6_skb_parm h6;
46#endif
47 } header;
48 __u16 cscov;
49 __u8 partial_cov;
50};
51#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053extern struct hlist_head udp_hash[UDP_HTABLE_SIZE];
54extern rwlock_t udp_hash_lock;
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57/* Note: this must match 'valbool' in sock_setsockopt */
58#define UDP_CSUM_NOXMIT 1
59
60/* Used by SunRPC/xprt layer. */
61#define UDP_CSUM_NORCV 2
62
63/* Default, as per the RFC, is to always do csums. */
64#define UDP_CSUM_DEFAULT 0
65
66extern struct proto udp_prot;
67
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020068struct sk_buff;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080070/*
71 * Generic checksumming routines for UDP(-Lite) v4 and v6
72 */
Al Virob51655b2006-11-14 21:40:42 -080073static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080074{
Herbert Xu759e5d02007-03-25 20:10:56 -070075 return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080076}
77
Al Viro8e5200f2006-11-20 18:06:37 -080078static inline int udp_lib_checksum_complete(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080079{
Herbert Xu60476372007-04-09 11:59:39 -070080 return !skb_csum_unnecessary(skb) &&
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080081 __udp_lib_checksum_complete(skb);
82}
83
84/**
85 * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
86 * @sk: socket we are writing to
87 * @skb: sk_buff containing the filled-in UDP header
88 * (checksum field must be zeroed out)
89 */
Al Viro868c86b2006-11-14 21:35:48 -080090static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080091{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -070092 __wsum csum = csum_partial(skb_transport_header(skb),
93 sizeof(struct udphdr), 0);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080094 skb_queue_walk(&sk->sk_write_queue, skb) {
95 csum = csum_add(csum, skb->csum);
96 }
97 return csum;
98}
99
100/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
101static inline void udp_lib_hash(struct sock *sk)
102{
103 BUG();
104}
105
106static inline void udp_lib_unhash(struct sock *sk)
107{
108 write_lock_bh(&udp_hash_lock);
109 if (sk_del_node_init(sk)) {
110 inet_sk(sk)->num = 0;
111 sock_prot_dec_use(sk->sk_prot);
112 }
113 write_unlock_bh(&udp_hash_lock);
114}
115
116static inline void udp_lib_close(struct sock *sk, long timeout)
117{
118 sk_common_release(sk);
119}
120
121
122/* net/ipv4/udp.c */
Gerrit Renker25030a72006-08-26 20:06:05 -0700123extern int udp_get_port(struct sock *sk, unsigned short snum,
David S. Millere3b4ead2006-08-26 20:10:15 -0700124 int (*saddr_cmp)(const struct sock *, const struct sock *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125extern void udp_err(struct sk_buff *, u32);
126
127extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
128 struct msghdr *msg, size_t len);
129
130extern int udp_rcv(struct sk_buff *skb);
131extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
132extern int udp_disconnect(struct sock *sk, int flags);
133extern unsigned int udp_poll(struct file *file, struct socket *sock,
134 poll_table *wait);
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800135extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
136 char __user *optval, int __user *optlen);
137extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
138 char __user *optval, int optlen,
139 int (*push_pending_frames)(struct sock *));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141DECLARE_SNMP_STAT(struct udp_mib, udp_statistics);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800142/*
143 * SNMP statistics for UDP and UDP-Lite
144 */
145#define UDP_INC_STATS_USER(field, is_udplite) do { \
146 if (is_udplite) SNMP_INC_STATS_USER(udplite_statistics, field); \
147 else SNMP_INC_STATS_USER(udp_statistics, field); } while(0)
148#define UDP_INC_STATS_BH(field, is_udplite) do { \
149 if (is_udplite) SNMP_INC_STATS_BH(udplite_statistics, field); \
150 else SNMP_INC_STATS_BH(udp_statistics, field); } while(0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152/* /proc */
153struct udp_seq_afinfo {
154 struct module *owner;
155 char *name;
156 sa_family_t family;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800157 struct hlist_head *hashtable;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 int (*seq_show) (struct seq_file *m, void *v);
159 struct file_operations *seq_fops;
160};
161
162struct udp_iter_state {
163 sa_family_t family;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800164 struct hlist_head *hashtable;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 int bucket;
166 struct seq_operations seq_ops;
167};
168
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300169#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170extern int udp_proc_register(struct udp_seq_afinfo *afinfo);
171extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300172
173extern int udp4_proc_init(void);
174extern void udp4_proc_exit(void);
175#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176#endif /* _UDP_H */