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.
6 * Definitions for the UDP module.
8 * Version: @(#)udp.h 1.0.2 05/07/93
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
14 * Alan Cox : Turned on udp checksums. I don't want to
15 * chase 'memory corruption' bugs that aren't!
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.
25 #include <linux/list.h>
26 #include <net/inet_sock.h>
30 #include <linux/ipv6.h>
31 #include <linux/seq_file.h>
32 #include <linux/poll.h>
35 * struct udp_skb_cb - UDP(-Lite) private variables
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
43 struct inet_skb_parm h4;
44 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
45 struct inet6_skb_parm h6;
51 #define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
54 struct hlist_nulls_head head;
56 } __attribute__((aligned(2 * sizeof(long))));
58 struct udp_hslot hash[UDP_HTABLE_SIZE];
60 extern struct udp_table udp_table;
61 extern void udp_table_init(struct udp_table *);
64 /* Note: this must match 'valbool' in sock_setsockopt */
65 #define UDP_CSUM_NOXMIT 1
67 /* Used by SunRPC/xprt layer. */
68 #define UDP_CSUM_NORCV 2
70 /* Default, as per the RFC, is to always do csums. */
71 #define UDP_CSUM_DEFAULT 0
73 extern struct proto udp_prot;
75 extern atomic_t udp_memory_allocated;
77 /* sysctl variables for udp */
78 extern int sysctl_udp_mem[3];
79 extern int sysctl_udp_rmem_min;
80 extern int sysctl_udp_wmem_min;
85 * Generic checksumming routines for UDP(-Lite) v4 and v6
87 static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
89 return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov);
92 static inline int udp_lib_checksum_complete(struct sk_buff *skb)
94 return !skb_csum_unnecessary(skb) &&
95 __udp_lib_checksum_complete(skb);
99 * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
100 * @sk: socket we are writing to
101 * @skb: sk_buff containing the filled-in UDP header
102 * (checksum field must be zeroed out)
104 static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
106 __wsum csum = csum_partial(skb_transport_header(skb),
107 sizeof(struct udphdr), 0);
108 skb_queue_walk(&sk->sk_write_queue, skb) {
109 csum = csum_add(csum, skb->csum);
114 /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
115 static inline void udp_lib_hash(struct sock *sk)
120 extern void udp_lib_unhash(struct sock *sk);
122 static inline void udp_lib_close(struct sock *sk, long timeout)
124 sk_common_release(sk);
127 extern int ipv4_rcv_saddr_equal(const struct sock *sk1,
128 const struct sock *sk2);
129 extern int udp_lib_get_port(struct sock *sk, unsigned short snum,
130 int (*)(const struct sock*,const struct sock*));
133 extern int udp_get_port(struct sock *sk, unsigned short snum,
134 int (*saddr_cmp)(const struct sock *, const struct sock *));
135 extern void udp_err(struct sk_buff *, u32);
137 extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
138 struct msghdr *msg, size_t len);
139 extern void udp_flush_pending_frames(struct sock *sk);
141 extern int udp_rcv(struct sk_buff *skb);
142 extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
143 extern int udp_disconnect(struct sock *sk, int flags);
144 extern unsigned int udp_poll(struct file *file, struct socket *sock,
146 extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
147 char __user *optval, int __user *optlen);
148 extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
149 char __user *optval, int optlen,
150 int (*push_pending_frames)(struct sock *));
152 extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
153 __be32 daddr, __be16 dport,
157 * SNMP statistics for UDP and UDP-Lite
159 #define UDP_INC_STATS_USER(net, field, is_udplite) do { \
160 if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \
161 else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0)
162 #define UDP_INC_STATS_BH(net, field, is_udplite) do { \
163 if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \
164 else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0)
166 #define UDP6_INC_STATS_BH(net, field, is_udplite) do { \
167 if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\
168 else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \
170 #define UDP6_INC_STATS_USER(net, field, __lite) do { \
171 if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \
172 else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \
175 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
176 #define UDPX_INC_STATS_BH(sk, field) \
178 if ((sk)->sk_family == AF_INET) \
179 UDP_INC_STATS_BH(sock_net(sk), field, 0); \
181 UDP6_INC_STATS_BH(sock_net(sk), field, 0); \
184 #define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0)
188 struct udp_seq_afinfo {
191 struct udp_table *udp_table;
192 struct file_operations seq_fops;
193 struct seq_operations seq_ops;
196 struct udp_iter_state {
197 struct seq_net_private p;
200 struct udp_table *udp_table;
203 #ifdef CONFIG_PROC_FS
204 extern int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo);
205 extern void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo);
207 extern int udp4_proc_init(void);
208 extern void udp4_proc_exit(void);
211 extern void udp_init(void);