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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 | |
645ca708 | 53 | struct udp_hslot { |
88ab1932 | 54 | struct hlist_nulls_head head; |
645ca708 ED |
55 | spinlock_t lock; |
56 | } __attribute__((aligned(2 * sizeof(long)))); | |
57 | struct udp_table { | |
58 | struct udp_hslot hash[UDP_HTABLE_SIZE]; | |
59 | }; | |
60 | extern struct udp_table udp_table; | |
61 | extern void udp_table_init(struct udp_table *); | |
1da177e4 | 62 | |
1da177e4 LT |
63 | |
64 | /* Note: this must match 'valbool' in sock_setsockopt */ | |
65 | #define UDP_CSUM_NOXMIT 1 | |
66 | ||
67 | /* Used by SunRPC/xprt layer. */ | |
68 | #define UDP_CSUM_NORCV 2 | |
69 | ||
70 | /* Default, as per the RFC, is to always do csums. */ | |
71 | #define UDP_CSUM_DEFAULT 0 | |
72 | ||
73 | extern struct proto udp_prot; | |
74 | ||
95766fff HA |
75 | extern atomic_t udp_memory_allocated; |
76 | ||
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; | |
81 | ||
14c85021 | 82 | struct sk_buff; |
1da177e4 | 83 | |
ba4e58ec GR |
84 | /* |
85 | * Generic checksumming routines for UDP(-Lite) v4 and v6 | |
86 | */ | |
b51655b9 | 87 | static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec | 88 | { |
759e5d00 | 89 | return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov); |
ba4e58ec GR |
90 | } |
91 | ||
8e5200f5 | 92 | static inline int udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec | 93 | { |
60476372 | 94 | return !skb_csum_unnecessary(skb) && |
ba4e58ec GR |
95 | __udp_lib_checksum_complete(skb); |
96 | } | |
97 | ||
98 | /** | |
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) | |
103 | */ | |
868c86bc | 104 | static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
ba4e58ec | 105 | { |
9c70220b ACM |
106 | __wsum csum = csum_partial(skb_transport_header(skb), |
107 | sizeof(struct udphdr), 0); | |
ba4e58ec GR |
108 | skb_queue_walk(&sk->sk_write_queue, skb) { |
109 | csum = csum_add(csum, skb->csum); | |
110 | } | |
111 | return csum; | |
112 | } | |
113 | ||
114 | /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ | |
115 | static inline void udp_lib_hash(struct sock *sk) | |
116 | { | |
117 | BUG(); | |
118 | } | |
119 | ||
645ca708 | 120 | extern void udp_lib_unhash(struct sock *sk); |
ba4e58ec GR |
121 | |
122 | static inline void udp_lib_close(struct sock *sk, long timeout) | |
123 | { | |
124 | sk_common_release(sk); | |
125 | } | |
126 | ||
6ba5a3c5 PE |
127 | extern int udp_lib_get_port(struct sock *sk, unsigned short snum, |
128 | int (*)(const struct sock*,const struct sock*)); | |
ba4e58ec GR |
129 | |
130 | /* net/ipv4/udp.c */ | |
25030a7f | 131 | extern int udp_get_port(struct sock *sk, unsigned short snum, |
df2bc459 | 132 | int (*saddr_cmp)(const struct sock *, const struct sock *)); |
1da177e4 LT |
133 | extern void udp_err(struct sk_buff *, u32); |
134 | ||
135 | extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk, | |
136 | struct msghdr *msg, size_t len); | |
36d926b9 | 137 | extern void udp_flush_pending_frames(struct sock *sk); |
1da177e4 LT |
138 | |
139 | extern int udp_rcv(struct sk_buff *skb); | |
140 | extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); | |
141 | extern int udp_disconnect(struct sock *sk, int flags); | |
142 | extern unsigned int udp_poll(struct file *file, struct socket *sock, | |
143 | poll_table *wait); | |
4c0a6cb0 GR |
144 | extern int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
145 | char __user *optval, int __user *optlen); | |
146 | extern int udp_lib_setsockopt(struct sock *sk, int level, int optname, | |
147 | char __user *optval, int optlen, | |
148 | int (*push_pending_frames)(struct sock *)); | |
1da177e4 | 149 | |
bcd41303 KK |
150 | extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
151 | __be32 daddr, __be16 dport, | |
152 | int dif); | |
153 | ||
ba4e58ec GR |
154 | /* |
155 | * SNMP statistics for UDP and UDP-Lite | |
156 | */ | |
2f275f91 | 157 | #define UDP_INC_STATS_USER(net, field, is_udplite) do { \ |
386019d3 | 158 | if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \ |
2f275f91 PE |
159 | else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0) |
160 | #define UDP_INC_STATS_BH(net, field, is_udplite) do { \ | |
386019d3 | 161 | if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \ |
2f275f91 | 162 | else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0) |
1da177e4 | 163 | |
0c7ed677 | 164 | #define UDP6_INC_STATS_BH(net, field, is_udplite) do { \ |
be713a44 | 165 | if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\ |
0c7ed677 DL |
166 | else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \ |
167 | } while(0) | |
be713a44 DL |
168 | #define UDP6_INC_STATS_USER(net, field, __lite) do { \ |
169 | if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \ | |
170 | else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \ | |
0c7ed677 | 171 | } while(0) |
1781f7f5 HX |
172 | |
173 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
174 | #define UDPX_INC_STATS_BH(sk, field) \ | |
175 | do { \ | |
176 | if ((sk)->sk_family == AF_INET) \ | |
0283328e | 177 | UDP_INC_STATS_BH(sock_net(sk), field, 0); \ |
1781f7f5 | 178 | else \ |
ef28d1a2 | 179 | UDP6_INC_STATS_BH(sock_net(sk), field, 0); \ |
1781f7f5 HX |
180 | } while (0); |
181 | #else | |
0283328e | 182 | #define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0) |
1781f7f5 HX |
183 | #endif |
184 | ||
1da177e4 LT |
185 | /* /proc */ |
186 | struct udp_seq_afinfo { | |
1da177e4 LT |
187 | char *name; |
188 | sa_family_t family; | |
645ca708 | 189 | struct udp_table *udp_table; |
3ba9441b | 190 | struct file_operations seq_fops; |
dda61925 | 191 | struct seq_operations seq_ops; |
1da177e4 LT |
192 | }; |
193 | ||
194 | struct udp_iter_state { | |
6f191efe | 195 | struct seq_net_private p; |
1da177e4 LT |
196 | sa_family_t family; |
197 | int bucket; | |
645ca708 | 198 | struct udp_table *udp_table; |
1da177e4 LT |
199 | }; |
200 | ||
20380731 | 201 | #ifdef CONFIG_PROC_FS |
0c96d8c5 DL |
202 | extern int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo); |
203 | extern void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo); | |
20380731 ACM |
204 | |
205 | extern int udp4_proc_init(void); | |
206 | extern void udp4_proc_exit(void); | |
207 | #endif | |
95766fff HA |
208 | |
209 | extern void udp_init(void); | |
1da177e4 | 210 | #endif /* _UDP_H */ |