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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
68extern atomic_t udp_memory_allocated;
69
70/* sysctl variables for udp */
71extern int sysctl_udp_mem[3];
72extern int sysctl_udp_rmem_min;
73extern int sysctl_udp_wmem_min;
74
75struct sk_buff;
76
77/*
78 * Generic checksumming routines for UDP(-Lite) v4 and v6
79 */
80static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
81{
82 return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov);
83}
84
85static inline int udp_lib_checksum_complete(struct sk_buff *skb)
86{
87 return !skb_csum_unnecessary(skb) &&
88 __udp_lib_checksum_complete(skb);
89}
90
91/**
92 * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
93 * @sk: socket we are writing to
94 * @skb: sk_buff containing the filled-in UDP header
95 * (checksum field must be zeroed out)
96 */
97static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
98{
99 __wsum csum = csum_partial(skb_transport_header(skb),
100 sizeof(struct udphdr), 0);
101 skb_queue_walk(&sk->sk_write_queue, skb) {
102 csum = csum_add(csum, skb->csum);
103 }
104 return csum;
105}
106
107/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
108static inline void udp_lib_hash(struct sock *sk)
109{
110 BUG();
111}
112
113static inline void udp_lib_unhash(struct sock *sk)
114{
115 write_lock_bh(&udp_hash_lock);
116 if (sk_del_node_init(sk)) {
117 inet_sk(sk)->num = 0;
118 sock_prot_inuse_add(sk->sk_prot, -1);
119 }
120 write_unlock_bh(&udp_hash_lock);
121}
122
123static inline void udp_lib_close(struct sock *sk, long timeout)
124{
125 sk_common_release(sk);
126}
127
128
129/* net/ipv4/udp.c */
130extern int udp_get_port(struct sock *sk, unsigned short snum,
131 int (*saddr_cmp)(const struct sock *, const struct sock *));
132extern void udp_err(struct sk_buff *, u32);
133
134extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
135 struct msghdr *msg, size_t len);
136
137extern int udp_rcv(struct sk_buff *skb);
138extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
139extern int udp_disconnect(struct sock *sk, int flags);
140extern unsigned int udp_poll(struct file *file, struct socket *sock,
141 poll_table *wait);
142extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
143 char __user *optval, int __user *optlen);
144extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
145 char __user *optval, int optlen,
146 int (*push_pending_frames)(struct sock *));
147
148DECLARE_SNMP_STAT(struct udp_mib, udp_statistics);
149DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
150
151/* UDP-Lite does not have a standardized MIB yet, so we inherit from UDP */
152DECLARE_SNMP_STAT(struct udp_mib, udplite_statistics);
153DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
154
155/*
156 * SNMP statistics for UDP and UDP-Lite
157 */
158#define UDP_INC_STATS_USER(field, is_udplite) do { \
159 if (is_udplite) SNMP_INC_STATS_USER(udplite_statistics, field); \
160 else SNMP_INC_STATS_USER(udp_statistics, field); } while(0)
161#define UDP_INC_STATS_BH(field, is_udplite) do { \
162 if (is_udplite) SNMP_INC_STATS_BH(udplite_statistics, field); \
163 else SNMP_INC_STATS_BH(udp_statistics, field); } while(0)
164
165#define UDP6_INC_STATS_BH(field, is_udplite) do { \
166 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \
167 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0)
168#define UDP6_INC_STATS_USER(field, is_udplite) do { \
169 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \
170 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0)
171
172#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
173#define UDPX_INC_STATS_BH(sk, field) \
174 do { \
175 if ((sk)->sk_family == AF_INET) \
176 UDP_INC_STATS_BH(field, 0); \
177 else \
178 UDP6_INC_STATS_BH(field, 0); \
179 } while (0);
180#else
181#define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(field, 0)
182#endif
183
184/* /proc */
185struct udp_seq_afinfo {
186 struct module *owner;
187 char *name;
188 sa_family_t family;
189 struct hlist_head *hashtable;
190 int (*seq_show) (struct seq_file *m, void *v);
191 struct file_operations *seq_fops;
192};
193
194struct udp_iter_state {
195 sa_family_t family;
196 struct hlist_head *hashtable;
197 int bucket;
198 struct seq_operations seq_ops;
199};
200
201#ifdef CONFIG_PROC_FS
202extern int udp_proc_register(struct udp_seq_afinfo *afinfo);
203extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo);
204
205extern int udp4_proc_init(void);
206extern void udp4_proc_exit(void);
207#endif
208
209extern void udp_init(void);
210#endif /* _UDP_H */