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1da177e4 LT |
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 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
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 | ||
1da177e4 | 25 | #include <linux/list.h> |
14c85021 | 26 | #include <net/inet_sock.h> |
1da177e4 LT |
27 | #include <net/sock.h> |
28 | #include <net/snmp.h> | |
ba4e58ec GR |
29 | #include <net/ip.h> |
30 | #include <linux/ipv6.h> | |
1da177e4 | 31 | #include <linux/seq_file.h> |
bd01f843 | 32 | #include <linux/poll.h> |
1da177e4 | 33 | |
ba4e58ec GR |
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 | */ | |
41 | struct 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)) | |
1da177e4 | 52 | |
1da177e4 LT |
53 | extern struct hlist_head udp_hash[UDP_HTABLE_SIZE]; |
54 | extern rwlock_t udp_hash_lock; | |
55 | ||
1da177e4 LT |
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 | ||
66 | extern struct proto udp_prot; | |
67 | ||
14c85021 | 68 | struct sk_buff; |
1da177e4 | 69 | |
ba4e58ec GR |
70 | /* |
71 | * Generic checksumming routines for UDP(-Lite) v4 and v6 | |
72 | */ | |
b51655b9 | 73 | static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec | 74 | { |
759e5d00 | 75 | return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov); |
ba4e58ec GR |
76 | } |
77 | ||
8e5200f5 | 78 | static inline int udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec GR |
79 | { |
80 | return skb->ip_summed != CHECKSUM_UNNECESSARY && | |
81 | __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 | */ | |
868c86bc | 90 | static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
ba4e58ec | 91 | { |
868c86bc | 92 | __wsum csum = csum_partial(skb->h.raw, sizeof(struct udphdr), 0); |
ba4e58ec GR |
93 | |
94 | 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 */ | |
101 | static inline void udp_lib_hash(struct sock *sk) | |
102 | { | |
103 | BUG(); | |
104 | } | |
105 | ||
106 | static 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 | ||
116 | static inline void udp_lib_close(struct sock *sk, long timeout) | |
117 | { | |
118 | sk_common_release(sk); | |
119 | } | |
120 | ||
121 | ||
122 | /* net/ipv4/udp.c */ | |
25030a7f | 123 | extern int udp_get_port(struct sock *sk, unsigned short snum, |
e3b4eadb | 124 | int (*saddr_cmp)(const struct sock *, const struct sock *)); |
1da177e4 LT |
125 | extern void udp_err(struct sk_buff *, u32); |
126 | ||
127 | extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk, | |
128 | struct msghdr *msg, size_t len); | |
129 | ||
130 | extern int udp_rcv(struct sk_buff *skb); | |
131 | extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); | |
132 | extern int udp_disconnect(struct sock *sk, int flags); | |
133 | extern unsigned int udp_poll(struct file *file, struct socket *sock, | |
134 | poll_table *wait); | |
4c0a6cb0 GR |
135 | extern int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
136 | char __user *optval, int __user *optlen); | |
137 | extern int udp_lib_setsockopt(struct sock *sk, int level, int optname, | |
138 | char __user *optval, int optlen, | |
139 | int (*push_pending_frames)(struct sock *)); | |
1da177e4 LT |
140 | |
141 | DECLARE_SNMP_STAT(struct udp_mib, udp_statistics); | |
ba4e58ec GR |
142 | /* |
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) | |
1da177e4 LT |
151 | |
152 | /* /proc */ | |
153 | struct udp_seq_afinfo { | |
154 | struct module *owner; | |
155 | char *name; | |
156 | sa_family_t family; | |
ba4e58ec | 157 | struct hlist_head *hashtable; |
1da177e4 LT |
158 | int (*seq_show) (struct seq_file *m, void *v); |
159 | struct file_operations *seq_fops; | |
160 | }; | |
161 | ||
162 | struct udp_iter_state { | |
163 | sa_family_t family; | |
ba4e58ec | 164 | struct hlist_head *hashtable; |
1da177e4 LT |
165 | int bucket; |
166 | struct seq_operations seq_ops; | |
167 | }; | |
168 | ||
20380731 | 169 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
170 | extern int udp_proc_register(struct udp_seq_afinfo *afinfo); |
171 | extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo); | |
20380731 ACM |
172 | |
173 | extern int udp4_proc_init(void); | |
174 | extern void udp4_proc_exit(void); | |
175 | #endif | |
1da177e4 | 176 | #endif /* _UDP_H */ |