Commit | Line | Data |
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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 | ||
95766fff HA |
68 | extern atomic_t udp_memory_allocated; |
69 | ||
70 | /* sysctl variables for udp */ | |
71 | extern int sysctl_udp_mem[3]; | |
72 | extern int sysctl_udp_rmem_min; | |
73 | extern int sysctl_udp_wmem_min; | |
74 | ||
14c85021 | 75 | struct sk_buff; |
1da177e4 | 76 | |
ba4e58ec GR |
77 | /* |
78 | * Generic checksumming routines for UDP(-Lite) v4 and v6 | |
79 | */ | |
b51655b9 | 80 | static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec | 81 | { |
759e5d00 | 82 | return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov); |
ba4e58ec GR |
83 | } |
84 | ||
8e5200f5 | 85 | static inline int udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec | 86 | { |
60476372 | 87 | return !skb_csum_unnecessary(skb) && |
ba4e58ec GR |
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 | */ | |
868c86bc | 97 | static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
ba4e58ec | 98 | { |
9c70220b ACM |
99 | __wsum csum = csum_partial(skb_transport_header(skb), |
100 | sizeof(struct udphdr), 0); | |
ba4e58ec GR |
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 */ | |
108 | static inline void udp_lib_hash(struct sock *sk) | |
109 | { | |
110 | BUG(); | |
111 | } | |
112 | ||
113 | static 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; | |
c29a0bc4 | 118 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
ba4e58ec GR |
119 | } |
120 | write_unlock_bh(&udp_hash_lock); | |
121 | } | |
122 | ||
123 | static inline void udp_lib_close(struct sock *sk, long timeout) | |
124 | { | |
125 | sk_common_release(sk); | |
126 | } | |
127 | ||
6ba5a3c5 PE |
128 | extern int udp_lib_get_port(struct sock *sk, unsigned short snum, |
129 | int (*)(const struct sock*,const struct sock*)); | |
ba4e58ec GR |
130 | |
131 | /* net/ipv4/udp.c */ | |
25030a7f | 132 | extern int udp_get_port(struct sock *sk, unsigned short snum, |
df2bc459 | 133 | int (*saddr_cmp)(const struct sock *, const struct sock *)); |
1da177e4 LT |
134 | extern void udp_err(struct sk_buff *, u32); |
135 | ||
136 | extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk, | |
137 | struct msghdr *msg, size_t len); | |
36d926b9 | 138 | extern void udp_flush_pending_frames(struct sock *sk); |
1da177e4 LT |
139 | |
140 | extern int udp_rcv(struct sk_buff *skb); | |
141 | extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); | |
142 | extern int udp_disconnect(struct sock *sk, int flags); | |
143 | extern unsigned int udp_poll(struct file *file, struct socket *sock, | |
144 | poll_table *wait); | |
4c0a6cb0 GR |
145 | extern int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
146 | char __user *optval, int __user *optlen); | |
147 | extern int udp_lib_setsockopt(struct sock *sk, int level, int optname, | |
148 | char __user *optval, int optlen, | |
149 | int (*push_pending_frames)(struct sock *)); | |
1da177e4 LT |
150 | |
151 | DECLARE_SNMP_STAT(struct udp_mib, udp_statistics); | |
1781f7f5 HX |
152 | DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6); |
153 | ||
154 | /* UDP-Lite does not have a standardized MIB yet, so we inherit from UDP */ | |
155 | DECLARE_SNMP_STAT(struct udp_mib, udplite_statistics); | |
156 | DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6); | |
157 | ||
ba4e58ec GR |
158 | /* |
159 | * SNMP statistics for UDP and UDP-Lite | |
160 | */ | |
161 | #define UDP_INC_STATS_USER(field, is_udplite) do { \ | |
162 | if (is_udplite) SNMP_INC_STATS_USER(udplite_statistics, field); \ | |
163 | else SNMP_INC_STATS_USER(udp_statistics, field); } while(0) | |
164 | #define UDP_INC_STATS_BH(field, is_udplite) do { \ | |
165 | if (is_udplite) SNMP_INC_STATS_BH(udplite_statistics, field); \ | |
166 | else SNMP_INC_STATS_BH(udp_statistics, field); } while(0) | |
1da177e4 | 167 | |
1781f7f5 HX |
168 | #define UDP6_INC_STATS_BH(field, is_udplite) do { \ |
169 | if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \ | |
170 | else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0) | |
171 | #define UDP6_INC_STATS_USER(field, is_udplite) do { \ | |
172 | if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \ | |
173 | else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0) | |
174 | ||
175 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
176 | #define UDPX_INC_STATS_BH(sk, field) \ | |
177 | do { \ | |
178 | if ((sk)->sk_family == AF_INET) \ | |
179 | UDP_INC_STATS_BH(field, 0); \ | |
180 | else \ | |
181 | UDP6_INC_STATS_BH(field, 0); \ | |
182 | } while (0); | |
183 | #else | |
184 | #define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(field, 0) | |
185 | #endif | |
186 | ||
1da177e4 LT |
187 | /* /proc */ |
188 | struct udp_seq_afinfo { | |
1da177e4 LT |
189 | char *name; |
190 | sa_family_t family; | |
ba4e58ec | 191 | struct hlist_head *hashtable; |
3ba9441b | 192 | struct file_operations seq_fops; |
dda61925 | 193 | struct seq_operations seq_ops; |
1da177e4 LT |
194 | }; |
195 | ||
196 | struct udp_iter_state { | |
6f191efe | 197 | struct seq_net_private p; |
1da177e4 | 198 | sa_family_t family; |
ba4e58ec | 199 | struct hlist_head *hashtable; |
1da177e4 | 200 | int bucket; |
1da177e4 LT |
201 | }; |
202 | ||
20380731 | 203 | #ifdef CONFIG_PROC_FS |
0c96d8c5 DL |
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); | |
20380731 ACM |
206 | |
207 | extern int udp4_proc_init(void); | |
208 | extern void udp4_proc_exit(void); | |
209 | #endif | |
95766fff HA |
210 | |
211 | extern void udp_init(void); | |
1da177e4 | 212 | #endif /* _UDP_H */ |