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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/list.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -050026#include <linux/bug.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020027#include <net/inet_sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <net/sock.h>
29#include <net/snmp.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080030#include <net/ip.h>
31#include <linux/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/seq_file.h>
Al Virobd01f842006-10-19 17:23:57 -040033#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080035/**
36 * struct udp_skb_cb - UDP(-Lite) private variables
37 *
38 * @header: private variables used by IPv4/IPv6
39 * @cscov: checksum coverage length (UDP-Lite only)
40 * @partial_cov: if set indicates partial csum coverage
41 */
42struct udp_skb_cb {
43 union {
44 struct inet_skb_parm h4;
Eric Dumazetdfd56b82011-12-10 09:48:31 +000045#if IS_ENABLED(CONFIG_IPV6)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080046 struct inet6_skb_parm h6;
47#endif
48 } header;
49 __u16 cscov;
50 __u8 partial_cov;
51};
52#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Eric Dumazetfdcc8aa92009-11-08 10:17:05 +000054/**
55 * struct udp_hslot - UDP hash slot
56 *
57 * @head: head of list of sockets
58 * @count: number of sockets in 'head' list
59 * @lock: spinlock protecting changes to head/count
60 */
Eric Dumazet645ca702008-10-29 01:41:45 -070061struct udp_hslot {
Eric Dumazet88ab1932008-11-16 19:39:21 -080062 struct hlist_nulls_head head;
Eric Dumazetfdcc8aa92009-11-08 10:17:05 +000063 int count;
Eric Dumazet645ca702008-10-29 01:41:45 -070064 spinlock_t lock;
65} __attribute__((aligned(2 * sizeof(long))));
Eric Dumazetf86dcc52009-10-07 00:37:59 +000066
Eric Dumazet512615b2009-11-08 10:17:58 +000067/**
68 * struct udp_table - UDP table
69 *
70 * @hash: hash table, sockets are hashed on (local port)
71 * @hash2: hash table, sockets are hashed on (local port, local address)
72 * @mask: number of slots in hash tables, minus 1
73 * @log: log2(number of slots in hash table)
74 */
Eric Dumazet645ca702008-10-29 01:41:45 -070075struct udp_table {
Eric Dumazetf86dcc52009-10-07 00:37:59 +000076 struct udp_hslot *hash;
Eric Dumazet512615b2009-11-08 10:17:58 +000077 struct udp_hslot *hash2;
78 unsigned int mask;
79 unsigned int log;
Eric Dumazet645ca702008-10-29 01:41:45 -070080};
81extern struct udp_table udp_table;
Eric Dumazetf86dcc52009-10-07 00:37:59 +000082extern void udp_table_init(struct udp_table *, const char *);
83static inline struct udp_hslot *udp_hashslot(struct udp_table *table,
84 struct net *net, unsigned num)
85{
86 return &table->hash[udp_hashfn(net, num, table->mask)];
87}
Eric Dumazet512615b2009-11-08 10:17:58 +000088/*
89 * For secondary hash, net_hash_mix() is performed before calling
90 * udp_hashslot2(), this explains difference with udp_hashslot()
91 */
92static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
93 unsigned int hash)
94{
95 return &table->hash2[hash & table->mask];
96}
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98/* Note: this must match 'valbool' in sock_setsockopt */
99#define UDP_CSUM_NOXMIT 1
100
101/* Used by SunRPC/xprt layer. */
102#define UDP_CSUM_NORCV 2
103
104/* Default, as per the RFC, is to always do csums. */
105#define UDP_CSUM_DEFAULT 0
106
107extern struct proto udp_prot;
108
Eric Dumazet8d987e52010-11-09 23:24:26 +0000109extern atomic_long_t udp_memory_allocated;
Hideo Aoki95766ff2007-12-31 00:29:24 -0800110
111/* sysctl variables for udp */
Eric Dumazet8d987e52010-11-09 23:24:26 +0000112extern long sysctl_udp_mem[3];
Hideo Aoki95766ff2007-12-31 00:29:24 -0800113extern int sysctl_udp_rmem_min;
114extern int sysctl_udp_wmem_min;
115
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200116struct sk_buff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800118/*
119 * Generic checksumming routines for UDP(-Lite) v4 and v6
120 */
Al Virob51655b2006-11-14 21:40:42 -0800121static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800122{
Herbert Xu759e5d02007-03-25 20:10:56 -0700123 return __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800124}
125
Al Viro8e5200f2006-11-20 18:06:37 -0800126static inline int udp_lib_checksum_complete(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800127{
Herbert Xu60476372007-04-09 11:59:39 -0700128 return !skb_csum_unnecessary(skb) &&
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800129 __udp_lib_checksum_complete(skb);
130}
131
132/**
133 * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
134 * @sk: socket we are writing to
135 * @skb: sk_buff containing the filled-in UDP header
136 * (checksum field must be zeroed out)
137 */
Al Viro868c86b2006-11-14 21:35:48 -0800138static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800139{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700140 __wsum csum = csum_partial(skb_transport_header(skb),
141 sizeof(struct udphdr), 0);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800142 skb_queue_walk(&sk->sk_write_queue, skb) {
143 csum = csum_add(csum, skb->csum);
144 }
145 return csum;
146}
147
Herbert Xuf6b96642011-03-01 02:36:48 +0000148static inline __wsum udp_csum(struct sk_buff *skb)
149{
150 __wsum csum = csum_partial(skb_transport_header(skb),
151 sizeof(struct udphdr), skb->csum);
152
153 for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) {
154 csum = csum_add(csum, skb->csum);
155 }
156 return csum;
157}
158
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800159/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
160static inline void udp_lib_hash(struct sock *sk)
161{
162 BUG();
163}
164
Eric Dumazet645ca702008-10-29 01:41:45 -0700165extern void udp_lib_unhash(struct sock *sk);
Eric Dumazet719f8352010-09-08 05:08:44 +0000166extern void udp_lib_rehash(struct sock *sk, u16 new_hash);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800167
168static inline void udp_lib_close(struct sock *sk, long timeout)
169{
170 sk_common_release(sk);
171}
172
Changli Gao53d31762010-07-10 20:41:06 +0000173extern int udp_lib_get_port(struct sock *sk, unsigned short snum,
174 int (*)(const struct sock *,const struct sock *),
175 unsigned int hash2_nulladdr);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800176
177/* net/ipv4/udp.c */
Changli Gao53d31762010-07-10 20:41:06 +0000178extern int udp_get_port(struct sock *sk, unsigned short snum,
179 int (*saddr_cmp)(const struct sock *,
180 const struct sock *));
181extern void udp_err(struct sk_buff *, u32);
182extern int udp_sendmsg(struct kiocb *iocb, struct sock *sk,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 struct msghdr *msg, size_t len);
Changli Gao53d31762010-07-10 20:41:06 +0000184extern void udp_flush_pending_frames(struct sock *sk);
185extern int udp_rcv(struct sk_buff *skb);
186extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
187extern int udp_disconnect(struct sock *sk, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188extern unsigned int udp_poll(struct file *file, struct socket *sock,
189 poll_table *wait);
Changli Gao53d31762010-07-10 20:41:06 +0000190extern int udp_lib_getsockopt(struct sock *sk, int level, int optname,
191 char __user *optval, int __user *optlen);
192extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
193 char __user *optval, unsigned int optlen,
194 int (*push_pending_frames)(struct sock *));
KOVACS Krisztianbcd41302008-10-01 07:48:10 -0700195extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
196 __be32 daddr, __be16 dport,
197 int dif);
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000198extern struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
199 __be32 daddr, __be16 dport,
200 int dif, struct udp_table *tbl);
Balazs Scheidleraa976fc2010-10-21 16:05:41 +0200201extern struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
202 const struct in6_addr *daddr, __be16 dport,
203 int dif);
Pavel Emelyanovfce82332011-12-09 06:23:34 +0000204extern struct sock *__udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
205 const struct in6_addr *daddr, __be16 dport,
206 int dif, struct udp_table *tbl);
KOVACS Krisztianbcd41302008-10-01 07:48:10 -0700207
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800208/*
209 * SNMP statistics for UDP and UDP-Lite
210 */
Pavel Emelyanov2f275f92008-07-18 04:03:27 -0700211#define UDP_INC_STATS_USER(net, field, is_udplite) do { \
Pavel Emelyanov386019d2008-07-18 04:03:45 -0700212 if (is_udplite) SNMP_INC_STATS_USER((net)->mib.udplite_statistics, field); \
Pavel Emelyanov2f275f92008-07-18 04:03:27 -0700213 else SNMP_INC_STATS_USER((net)->mib.udp_statistics, field); } while(0)
214#define UDP_INC_STATS_BH(net, field, is_udplite) do { \
Pavel Emelyanov386019d2008-07-18 04:03:45 -0700215 if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_statistics, field); \
Pavel Emelyanov2f275f92008-07-18 04:03:27 -0700216 else SNMP_INC_STATS_BH((net)->mib.udp_statistics, field); } while(0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Denis V. Lunev0c7ed672008-10-07 14:49:36 -0700218#define UDP6_INC_STATS_BH(net, field, is_udplite) do { \
Denis V. Lunevbe713a42008-10-07 14:50:06 -0700219 if (is_udplite) SNMP_INC_STATS_BH((net)->mib.udplite_stats_in6, field);\
Denis V. Lunev0c7ed672008-10-07 14:49:36 -0700220 else SNMP_INC_STATS_BH((net)->mib.udp_stats_in6, field); \
221} while(0)
Denis V. Lunevbe713a42008-10-07 14:50:06 -0700222#define UDP6_INC_STATS_USER(net, field, __lite) do { \
223 if (__lite) SNMP_INC_STATS_USER((net)->mib.udplite_stats_in6, field); \
224 else SNMP_INC_STATS_USER((net)->mib.udp_stats_in6, field); \
Denis V. Lunev0c7ed672008-10-07 14:49:36 -0700225} while(0)
Herbert Xu1781f7f2007-12-11 11:30:32 -0800226
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000227#if IS_ENABLED(CONFIG_IPV6)
Herbert Xu1781f7f2007-12-11 11:30:32 -0800228#define UDPX_INC_STATS_BH(sk, field) \
229 do { \
230 if ((sk)->sk_family == AF_INET) \
Pavel Emelyanov02833282008-07-05 21:18:48 -0700231 UDP_INC_STATS_BH(sock_net(sk), field, 0); \
Herbert Xu1781f7f2007-12-11 11:30:32 -0800232 else \
Pavel Emelyanovef28d1a2008-07-05 21:19:40 -0700233 UDP6_INC_STATS_BH(sock_net(sk), field, 0); \
Herbert Xu1781f7f2007-12-11 11:30:32 -0800234 } while (0);
235#else
Pavel Emelyanov02833282008-07-05 21:18:48 -0700236#define UDPX_INC_STATS_BH(sk, field) UDP_INC_STATS_BH(sock_net(sk), field, 0)
Herbert Xu1781f7f2007-12-11 11:30:32 -0800237#endif
238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239/* /proc */
Arjan van de Ven73cb88e2011-10-30 06:46:30 +0000240int udp_seq_open(struct inode *inode, struct file *file);
241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242struct udp_seq_afinfo {
Arjan van de Ven73cb88e2011-10-30 06:46:30 +0000243 char *name;
244 sa_family_t family;
245 struct udp_table *udp_table;
246 const struct file_operations *seq_fops;
247 struct seq_operations seq_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248};
249
250struct udp_iter_state {
Denis V. Lunev6f191ef2008-03-28 18:23:33 -0700251 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 sa_family_t family;
253 int bucket;
Eric Dumazet645ca702008-10-29 01:41:45 -0700254 struct udp_table *udp_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255};
256
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300257#ifdef CONFIG_PROC_FS
Daniel Lezcano0c96d8c2008-03-21 04:14:17 -0700258extern int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo);
259extern void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300260
Changli Gao53d31762010-07-10 20:41:06 +0000261extern int udp4_proc_init(void);
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300262extern void udp4_proc_exit(void);
263#endif
Hideo Aoki95766ff2007-12-31 00:29:24 -0800264
265extern void udp_init(void);
Sridhar Samudralad7ca4cc2009-07-09 08:09:47 +0000266
267extern int udp4_ufo_send_check(struct sk_buff *skb);
Michał Mirosławc8f44af2011-11-15 15:29:55 +0000268extern struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
269 netdev_features_t features);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270#endif /* _UDP_H */