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1/*
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 *
10 * Authors: Ross Biro
11 * 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
25#include <linux/list.h>
26#include <net/inet_sock.h>
27#include <net/sock.h>
28#include <net/snmp.h>
29#include <net/ip.h>
30#include <linux/ipv6.h>
31#include <linux/seq_file.h>
32#include <linux/poll.h>
33
34/**
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))
52
53extern struct hlist_head udp_hash[UDP_HTABLE_SIZE];
54extern rwlock_t udp_hash_lock;
55
56
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
68struct sk_buff;
69
70/*
71 * Generic checksumming routines for UDP(-Lite) v4 and v6
72 */
73static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
74{
75 if (! UDP_SKB_CB(skb)->partial_cov)
76 return __skb_checksum_complete(skb);
77 return csum_fold(skb_checksum(skb, 0, UDP_SKB_CB(skb)->cscov,
78 skb->csum));
79}
80
81static inline int udp_lib_checksum_complete(struct sk_buff *skb)
82{
83 return skb->ip_summed != CHECKSUM_UNNECESSARY &&
84 __udp_lib_checksum_complete(skb);
85}
86
87/**
88 * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
89 * @sk: socket we are writing to
90 * @skb: sk_buff containing the filled-in UDP header
91 * (checksum field must be zeroed out)
92 */
93static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
94{
95 __wsum csum = csum_partial(skb->h.raw, sizeof(struct udphdr), 0);
96
97 skb_queue_walk(&sk->sk_write_queue, skb) {
98 csum = csum_add(csum, skb->csum);
99 }
100 return csum;
101}
102
103/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
104static inline void udp_lib_hash(struct sock *sk)
105{
106 BUG();
107}
108
109static inline void udp_lib_unhash(struct sock *sk)
110{
111 write_lock_bh(&udp_hash_lock);
112 if (sk_del_node_init(sk)) {
113 inet_sk(sk)->num = 0;
114 sock_prot_dec_use(sk->sk_prot);
115 }
116 write_unlock_bh(&udp_hash_lock);
117}
118
119static inline void udp_lib_close(struct sock *sk, long timeout)
120{
121 sk_common_release(sk);
122}
123
124
125/* net/ipv4/udp.c */
126extern int udp_get_port(struct sock *sk, unsigned short snum,
127 int (*saddr_cmp)(const struct sock *, const struct sock *));
128extern void udp_err(struct sk_buff *, u32);
129
130extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
131 struct msghdr *msg, size_t len);
132
133extern int udp_rcv(struct sk_buff *skb);
134extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
135extern int udp_disconnect(struct sock *sk, int flags);
136extern unsigned int udp_poll(struct file *file, struct socket *sock,
137 poll_table *wait);
138extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
139 char __user *optval, int __user *optlen);
140extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
141 char __user *optval, int optlen,
142 int (*push_pending_frames)(struct sock *));
143
144DECLARE_SNMP_STAT(struct udp_mib, udp_statistics);
145/*
146 * SNMP statistics for UDP and UDP-Lite
147 */
148#define UDP_INC_STATS_USER(field, is_udplite) do { \
149 if (is_udplite) SNMP_INC_STATS_USER(udplite_statistics, field); \
150 else SNMP_INC_STATS_USER(udp_statistics, field); } while(0)
151#define UDP_INC_STATS_BH(field, is_udplite) do { \
152 if (is_udplite) SNMP_INC_STATS_BH(udplite_statistics, field); \
153 else SNMP_INC_STATS_BH(udp_statistics, field); } while(0)
154
155/* /proc */
156struct udp_seq_afinfo {
157 struct module *owner;
158 char *name;
159 sa_family_t family;
160 struct hlist_head *hashtable;
161 int (*seq_show) (struct seq_file *m, void *v);
162 struct file_operations *seq_fops;
163};
164
165struct udp_iter_state {
166 sa_family_t family;
167 struct hlist_head *hashtable;
168 int bucket;
169 struct seq_operations seq_ops;
170};
171
172#ifdef CONFIG_PROC_FS
173extern int udp_proc_register(struct udp_seq_afinfo *afinfo);
174extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo);
175
176extern int udp4_proc_init(void);
177extern void udp4_proc_exit(void);
178#endif
179#endif /* _UDP_H */