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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 protocol.
7 *
8 * Version: @(#)udp.h 1.0.2 04/28/93
9 *
10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17#ifndef _LINUX_UDP_H
18#define _LINUX_UDP_H
19
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020020#include <net/inet_sock.h>
Joe Perches310afe82008-03-23 22:06:51 -070021#include <linux/skbuff.h>
Pavel Emelyanov0b441912008-06-16 17:14:11 -070022#include <net/netns/hash.h>
David Howells607ca462012-10-13 10:46:48 +010023#include <uapi/linux/udp.h>
Joe Perches310afe82008-03-23 22:06:51 -070024
25static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
26{
27 return (struct udphdr *)skb_transport_header(skb);
28}
29
Joseph Gasparakis6a674e92012-12-07 14:14:14 +000030static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb)
31{
32 return (struct udphdr *)skb_inner_transport_header(skb);
33}
34
Eric Dumazetf86dcc52009-10-07 00:37:59 +000035#define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Eric Dumazetf86dcc52009-10-07 00:37:59 +000037static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
Pavel Emelyanovd6266282008-06-16 17:11:50 -070038{
Eric Dumazetf86dcc52009-10-07 00:37:59 +000039 return (num + net_hash_mix(net)) & mask;
Pavel Emelyanovd6266282008-06-16 17:11:50 -070040}
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042struct udp_sock {
43 /* inet_sock has to be the first member */
44 struct inet_sock inet;
Eric Dumazetd4cada42009-11-08 10:17:30 +000045#define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0]
46#define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1]
Eric Dumazet512615b2009-11-08 10:17:58 +000047#define udp_portaddr_node inet.sk.__sk_common.skc_portaddr_node
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 int pending; /* Any pending frames ? */
49 unsigned int corkflag; /* Cork is required */
50 __u16 encap_type; /* Is this an Encapsulation socket? */
51 /*
Adrian Bunk47bdd712006-06-30 18:25:18 +020052 * Following member retains the information to create a UDP header
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 * when the socket is uncorked.
54 */
55 __u16 len; /* total length of pending frames */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080056 /*
57 * Fields specific to UDP-Lite.
58 */
59 __u16 pcslen;
60 __u16 pcrlen;
61/* indicator bits used by pcflag: */
62#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
63#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
64#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
65 __u8 pcflag; /* marks socket as UDP-Lite if > 0 */
James Chapman342f0232007-06-27 15:37:46 -070066 __u8 unused[3];
67 /*
68 * For encapsulation sockets.
69 */
70 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
Tom Parkin44046a52013-03-19 06:11:12 +000071 void (*encap_destroy)(struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072};
73
74static inline struct udp_sock *udp_sk(const struct sock *sk)
75{
76 return (struct udp_sock *)sk;
77}
YOSHIFUJI Hideakie898d4d2008-03-01 01:06:47 +090078
Eric Dumazet30fff922009-11-09 05:26:33 +000079#define udp_portaddr_for_each_entry(__sk, node, list) \
80 hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)
81
82#define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
83 hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)
84
Gerrit Renkerba4e58e2006-11-27 11:10:57 -080085#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#endif /* _LINUX_UDP_H */