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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 LT |
31 | #include <linux/seq_file.h> |
32 | ||
ba4e58ec GR |
33 | /** |
34 | * struct udp_skb_cb - UDP(-Lite) private variables | |
35 | * | |
36 | * @header: private variables used by IPv4/IPv6 | |
37 | * @cscov: checksum coverage length (UDP-Lite only) | |
38 | * @partial_cov: if set indicates partial csum coverage | |
39 | */ | |
40 | struct udp_skb_cb { | |
41 | union { | |
42 | struct inet_skb_parm h4; | |
43 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) | |
44 | struct inet6_skb_parm h6; | |
45 | #endif | |
46 | } header; | |
47 | __u16 cscov; | |
48 | __u8 partial_cov; | |
49 | }; | |
50 | #define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb)) | |
1da177e4 | 51 | |
1da177e4 LT |
52 | extern struct hlist_head udp_hash[UDP_HTABLE_SIZE]; |
53 | extern rwlock_t udp_hash_lock; | |
54 | ||
1da177e4 LT |
55 | |
56 | /* Note: this must match 'valbool' in sock_setsockopt */ | |
57 | #define UDP_CSUM_NOXMIT 1 | |
58 | ||
59 | /* Used by SunRPC/xprt layer. */ | |
60 | #define UDP_CSUM_NORCV 2 | |
61 | ||
62 | /* Default, as per the RFC, is to always do csums. */ | |
63 | #define UDP_CSUM_DEFAULT 0 | |
64 | ||
65 | extern struct proto udp_prot; | |
66 | ||
14c85021 | 67 | struct sk_buff; |
1da177e4 | 68 | |
ba4e58ec GR |
69 | /* |
70 | * Generic checksumming routines for UDP(-Lite) v4 and v6 | |
71 | */ | |
72 | static inline u16 __udp_lib_checksum_complete(struct sk_buff *skb) | |
73 | { | |
74 | if (! UDP_SKB_CB(skb)->partial_cov) | |
75 | return __skb_checksum_complete(skb); | |
76 | return csum_fold(skb_checksum(skb, 0, UDP_SKB_CB(skb)->cscov, | |
77 | skb->csum)); | |
78 | } | |
79 | ||
80 | static __inline__ int udp_lib_checksum_complete(struct sk_buff *skb) | |
81 | { | |
82 | return skb->ip_summed != CHECKSUM_UNNECESSARY && | |
83 | __udp_lib_checksum_complete(skb); | |
84 | } | |
85 | ||
86 | /** | |
87 | * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments | |
88 | * @sk: socket we are writing to | |
89 | * @skb: sk_buff containing the filled-in UDP header | |
90 | * (checksum field must be zeroed out) | |
91 | */ | |
868c86bc | 92 | static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
ba4e58ec | 93 | { |
868c86bc | 94 | __wsum csum = csum_partial(skb->h.raw, sizeof(struct udphdr), 0); |
ba4e58ec GR |
95 | |
96 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
97 | csum = csum_add(csum, skb->csum); | |
98 | } | |
99 | return csum; | |
100 | } | |
101 | ||
102 | /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ | |
103 | static inline void udp_lib_hash(struct sock *sk) | |
104 | { | |
105 | BUG(); | |
106 | } | |
107 | ||
108 | static inline void udp_lib_unhash(struct sock *sk) | |
109 | { | |
110 | write_lock_bh(&udp_hash_lock); | |
111 | if (sk_del_node_init(sk)) { | |
112 | inet_sk(sk)->num = 0; | |
113 | sock_prot_dec_use(sk->sk_prot); | |
114 | } | |
115 | write_unlock_bh(&udp_hash_lock); | |
116 | } | |
117 | ||
118 | static inline void udp_lib_close(struct sock *sk, long timeout) | |
119 | { | |
120 | sk_common_release(sk); | |
121 | } | |
122 | ||
123 | ||
124 | /* net/ipv4/udp.c */ | |
25030a7f | 125 | extern int udp_get_port(struct sock *sk, unsigned short snum, |
e3b4eadb | 126 | int (*saddr_cmp)(const struct sock *, const struct sock *)); |
1da177e4 LT |
127 | extern void udp_err(struct sk_buff *, u32); |
128 | ||
129 | extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk, | |
130 | struct msghdr *msg, size_t len); | |
131 | ||
132 | extern int udp_rcv(struct sk_buff *skb); | |
133 | extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); | |
134 | extern int udp_disconnect(struct sock *sk, int flags); | |
135 | extern unsigned int udp_poll(struct file *file, struct socket *sock, | |
136 | poll_table *wait); | |
137 | ||
138 | DECLARE_SNMP_STAT(struct udp_mib, udp_statistics); | |
ba4e58ec GR |
139 | /* |
140 | * SNMP statistics for UDP and UDP-Lite | |
141 | */ | |
142 | #define UDP_INC_STATS_USER(field, is_udplite) do { \ | |
143 | if (is_udplite) SNMP_INC_STATS_USER(udplite_statistics, field); \ | |
144 | else SNMP_INC_STATS_USER(udp_statistics, field); } while(0) | |
145 | #define UDP_INC_STATS_BH(field, is_udplite) do { \ | |
146 | if (is_udplite) SNMP_INC_STATS_BH(udplite_statistics, field); \ | |
147 | else SNMP_INC_STATS_BH(udp_statistics, field); } while(0) | |
1da177e4 LT |
148 | |
149 | /* /proc */ | |
150 | struct udp_seq_afinfo { | |
151 | struct module *owner; | |
152 | char *name; | |
153 | sa_family_t family; | |
ba4e58ec | 154 | struct hlist_head *hashtable; |
1da177e4 LT |
155 | int (*seq_show) (struct seq_file *m, void *v); |
156 | struct file_operations *seq_fops; | |
157 | }; | |
158 | ||
159 | struct udp_iter_state { | |
160 | sa_family_t family; | |
ba4e58ec | 161 | struct hlist_head *hashtable; |
1da177e4 LT |
162 | int bucket; |
163 | struct seq_operations seq_ops; | |
164 | }; | |
165 | ||
20380731 | 166 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
167 | extern int udp_proc_register(struct udp_seq_afinfo *afinfo); |
168 | extern void udp_proc_unregister(struct udp_seq_afinfo *afinfo); | |
20380731 ACM |
169 | |
170 | extern int udp4_proc_init(void); | |
171 | extern void udp4_proc_exit(void); | |
172 | #endif | |
1da177e4 | 173 | #endif /* _UDP_H */ |