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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 | * |
10 | * Authors: Ross Biro |
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 | |
25 | #include <linux/list.h> |
26 | #include <net/inet_sock.h> |
27 | #include <net/sock.h> |
28 | #include <net/snmp.h> |
29 | #include <net/ip.h> |
30 | #include <linux/ipv6.h> |
31 | #include <linux/seq_file.h> |
32 | #include <linux/poll.h> |
33 | |
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)) |
52 | |
53 | /** |
54 | * struct udp_hslot - UDP hash slot |
55 | * |
56 | * @head: head of list of sockets |
57 | * @count: number of sockets in 'head' list |
58 | * @lock: spinlock protecting changes to head/count |
59 | */ |
60 | struct udp_hslot { |
61 | struct hlist_nulls_head head; |
62 | int count; |
63 | spinlock_t lock; |
64 | } __attribute__((aligned(2 * sizeof(long)))); |
65 | |
66 | /** |
67 | * struct udp_table - UDP table |
68 | * |
69 | * @hash: hash table, sockets are hashed on (local port) |
70 | * @hash2: hash table, sockets are hashed on (local port, local address) |
71 | * @mask: number of slots in hash tables, minus 1 |
72 | * @log: log2(number of slots in hash table) |
73 | */ |
74 | struct udp_table { |
75 | struct udp_hslot *hash; |
76 | struct udp_hslot *hash2; |
77 | unsigned int mask; |
78 | unsigned int log; |
79 | }; |
80 | extern struct udp_table udp_table; |
81 | extern void udp_table_init(struct udp_table *, const char *); |
82 | static inline struct udp_hslot *udp_hashslot(struct udp_table *table, |
83 | struct net *net, unsigned num) |
84 | { |
85 | return &table->hash[udp_hashfn(net, num, table->mask)]; |
86 | } |
87 | /* |
88 | * For secondary hash, net_hash_mix() is performed before calling |
89 | * udp_hashslot2(), this explains difference with udp_hashslot() |
90 | */ |
91 | static inline struct udp_hslot *udp_hashslot2(struct udp_table *table, |
92 | unsigned int hash) |
93 | { |
94 | return &table->hash2[hash & table->mask]; |
95 | } |
96 | |
97 | /* Note: this must match 'valbool' in sock_setsockopt */ |
98 | #define UDP_CSUM_NOXMIT 1 |
99 | |
100 | /* Used by SunRPC/xprt layer. */ |
101 | #define UDP_CSUM_NORCV 2 |
102 | |
103 | /* Default, as per the RFC, is to always do csums. */ |
104 | #define UDP_CSUM_DEFAULT 0 |
105 | |
106 | extern struct proto udp_prot; |
107 | |
108 | extern atomic_long_t udp_memory_allocated; |
109 | |
110 | /* sysctl variables for udp */ |
111 | extern long sysctl_udp_mem[3]; |
112 | extern int sysctl_udp_rmem_min; |
113 | extern int sysctl_udp_wmem_min; |
114 | |
115 | struct sk_buff; |
116 | |
117 | /* |
118 | * Generic checksumming routines for UDP(-Lite) v4 and v6 |
119 | */ |
120 | static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) |
121 | { |
122 | return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov); |
123 | } |
124 | |
125 | static inline int udp_lib_checksum_complete(struct sk_buff *skb) |
126 | { |
127 | return !skb_csum_unnecessary(skb) && |
128 | __udp_lib_checksum_complete(skb); |
129 | } |
130 | |
131 | /** |
132 | * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments |
133 | * @sk: socket we are writing to |
134 | * @skb: sk_buff containing the filled-in UDP header |
135 | * (checksum field must be zeroed out) |
136 | */ |
137 | static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
138 | { |
139 | __wsum csum = csum_partial(skb_transport_header(skb), |
140 | sizeof(struct udphdr), 0); |
141 | skb_queue_walk(&sk->sk_write_queue, skb) { |
142 | csum = csum_add(csum, skb->csum); |
143 | } |
144 | return csum; |
145 | } |
146 | |
147 | static inline __wsum udp_csum(struct sk_buff *skb) |
148 | { |
149 | __wsum csum = csum_partial(skb_transport_header(skb), |
150 | sizeof(struct udphdr), skb->csum); |
151 | |
152 | for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) { |
153 | csum = csum_add(csum, skb->csum); |
154 | } |
155 | return csum; |
156 | } |
157 | |
158 | /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ |
159 | static inline void udp_lib_hash(struct sock *sk) |
160 | { |
161 | BUG(); |
162 | } |
163 | |
164 | extern void udp_lib_unhash(struct sock *sk); |
165 | extern void udp_lib_rehash(struct sock *sk, u16 new_hash); |
166 | |
167 | static inline void udp_lib_close(struct sock *sk, long timeout) |
168 | { |
169 | sk_common_release(sk); |
170 | } |
171 | |
172 | extern int udp_lib_get_port(struct sock *sk, unsigned short snum, |
173 | int (*)(const struct sock *,const struct sock *), |
174 | unsigned int hash2_nulladdr); |
175 | |
176 | /* net/ipv4/udp.c */ |
177 | extern int udp_get_port(struct sock *sk, unsigned short snum, |
178 | int (*saddr_cmp)(const struct sock *, |
179 | const struct sock *)); |
180 | extern void udp_err(struct sk_buff *, u32); |
181 | extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk, |
182 | struct msghdr *msg, size_t len); |
183 | extern void udp_flush_pending_frames(struct sock *sk); |
184 | extern int udp_rcv(struct sk_buff *skb); |
185 | extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
186 | extern int udp_disconnect(struct sock *sk, int flags); |
187 | extern unsigned int udp_poll(struct file *file, struct socket *sock, |
188 | poll_table *wait); |
189 | extern int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
190 | char __user *optval, int __user *optlen); |
191 | extern int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
192 | char __user *optval, unsigned int optlen, |
193 | int (*push_pending_frames)(struct sock *)); |
194 | extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
195 | __be32 daddr, __be16 dport, |
196 | int dif); |
197 | extern struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
198 | const struct in6_addr *daddr, __be16 dport, |
199 | int dif); |
200 | |
201 | /* |
202 | * SNMP statistics for UDP and UDP-Lite |
203 | */ |
204 | #define UDP_INC_STATS_USER(net, field, is_udplite) do { \ |
205 | if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \ |
206 | else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0) |
207 | #define UDP_INC_STATS_BH(net, field, is_udplite) do { \ |
208 | if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \ |
209 | else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0) |
210 | |
211 | #define UDP6_INC_STATS_BH(net, field, is_udplite) do { \ |
212 | if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\ |
213 | else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \ |
214 | } while(0) |
215 | #define UDP6_INC_STATS_USER(net, field, __lite) do { \ |
216 | if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \ |
217 | else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \ |
218 | } while(0) |
219 | |
220 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
221 | #define UDPX_INC_STATS_BH(sk, field) \ |
222 | do { \ |
223 | if ((sk)->sk_family == AF_INET) \ |
224 | UDP_INC_STATS_BH(sock_net(sk), field, 0); \ |
225 | else \ |
226 | UDP6_INC_STATS_BH(sock_net(sk), field, 0); \ |
227 | } while (0); |
228 | #else |
229 | #define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0) |
230 | #endif |
231 | |
232 | /* /proc */ |
233 | struct udp_seq_afinfo { |
234 | char *name; |
235 | sa_family_t family; |
236 | struct udp_table *udp_table; |
237 | struct file_operations seq_fops; |
238 | struct seq_operations seq_ops; |
239 | }; |
240 | |
241 | struct udp_iter_state { |
242 | struct seq_net_private p; |
243 | sa_family_t family; |
244 | int bucket; |
245 | struct udp_table *udp_table; |
246 | }; |
247 | |
248 | #ifdef CONFIG_PROC_FS |
249 | extern int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo); |
250 | extern void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo); |
251 | |
252 | extern int udp4_proc_init(void); |
253 | extern void udp4_proc_exit(void); |
254 | #endif |
255 | |
256 | extern void udp_init(void); |
257 | |
258 | extern int udp4_ufo_send_check(struct sk_buff *skb); |
259 | extern struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, u32 features); |
260 | #endif /* _UDP_H */ |
261 |
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