aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/udp.h
blob: 2725c83395bfdd9e0ca0b78a1859bb6203af9f1c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the UDP protocol.
 *
 * Version:	@(#)udp.h	1.0.2	04/28/93
 *
 * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_UDP_H
#define _LINUX_UDP_H

#include <net/inet_sock.h>
#include <linux/skbuff.h>
#include <net/netns/hash.h>
#include <uapi/linux/udp.h>

static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
{
	return (struct udphdr *)skb_transport_header(skb);
}

static inline struct udphdr *inner_udp_hdr(const struct sk_buff *skb)
{
	return (struct udphdr *)skb_inner_transport_header(skb);
}

#define UDP_HTABLE_SIZE_MIN		(CONFIG_BASE_SMALL ? 128 : 256)

static inline u32 udp_hashfn(const struct net *net, u32 num, u32 mask)
{
	return (num + net_hash_mix(net)) & mask;
}

struct udp_sock {
	/* inet_sock has to be the first member */
	struct inet_sock inet;
#define udp_port_hash		inet.sk.__sk_common.skc_u16hashes[0]
#define udp_portaddr_hash	inet.sk.__sk_common.skc_u16hashes[1]
#define udp_portaddr_node	inet.sk.__sk_common.skc_portaddr_node
	int		 pending;	/* Any pending frames ? */
	unsigned int	 corkflag;	/* Cork is required */
	__u8		 encap_type;	/* Is this an Encapsulation socket? */
	unsigned char	 no_check6_tx:1,/* Send zero UDP6 checksums on TX? */
			 no_check6_rx:1,/* Allow zero UDP6 checksums on RX? */
			 encap_enabled:1, /* This socket enabled encap
					   * processing; UDP tunnels and
					   * different encapsulation layer set
					   * this
					   */
			 gro_enabled:1;	/* Can accept GRO packets */
	/*
	 * Following member retains the information to create a UDP header
	 * when the socket is uncorked.
	 */
	__u16		 len;		/* total length of pending frames */
	__u16		 gso_size;
	/*
	 * Fields specific to UDP-Lite.
	 */
	__u16		 pcslen;
	__u16		 pcrlen;
/* indicator bits used by pcflag: */
#define UDPLITE_BIT      0x1  		/* set by udplite proto init function */
#define UDPLITE_SEND_CC  0x2  		/* set via udplite setsockopt         */
#define UDPLITE_RECV_CC  0x4		/* set via udplite setsocktopt        */
	__u8		 pcflag;        /* marks socket as UDP-Lite if > 0    */
	__u8		 unused[3];
	/*
	 * For encapsulation sockets.
	 */
	int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
	int (*encap_err_lookup)(struct sock *sk, struct sk_buff *skb);
	void (*encap_destroy)(struct sock *sk);

	/* GRO functions for UDP socket */
	struct sk_buff *	(*gro_receive)(struct sock *sk,
					       struct list_head *head,
					       struct sk_buff *skb);
	int			(*gro_complete)(struct sock *sk,
						struct sk_buff *skb,
						int nhoff);

	/* udp_recvmsg try to use this before splicing sk_receive_queue */
	struct sk_buff_head	reader_queue ____cacheline_aligned_in_smp;

	/* This field is dirtied by udp_recvmsg() */
	int		forward_deficit;
};

#define UDP_MAX_SEGMENTS	(1 << 6UL)

static inline struct udp_sock *udp_sk(const struct sock *sk)
{
	return (struct udp_sock *)sk;
}

static inline void udp_set_no_check6_tx(struct sock *sk, bool val)
{
	udp_sk(sk)->no_check6_tx = val;
}

static inline void udp_set_no_check6_rx(struct sock *sk, bool val)
{
	udp_sk(sk)->no_check6_rx = val;
}

static inline bool udp_get_no_check6_tx(struct sock *sk)
{
	return udp_sk(sk)->no_check6_tx;
}

static inline bool udp_get_no_check6_rx(struct sock *sk)
{
	return udp_sk(sk)->no_check6_rx;
}

static inline void udp_cmsg_recv(struct msghdr *msg, struct sock *sk,
				 struct sk_buff *skb)
{
	int gso_size;

	if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
		gso_size = skb_shinfo(skb)->gso_size;
		put_cmsg(msg, SOL_UDP, UDP_GRO, sizeof(gso_size), &gso_size);
	}
}

static inline bool udp_unexpected_gso(struct sock *sk, struct sk_buff *skb)
{
	return !udp_sk(sk)->gro_enabled && skb_is_gso(skb) &&
	       skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4;
}

#define udp_portaddr_for_each_entry(__sk, list) \
	hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)

#define udp_portaddr_for_each_entry_rcu(__sk, list) \
	hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node)

#define IS_UDPLITE(__sk) (__sk->sk_protocol == IPPROTO_UDPLITE)

#endif	/* _LINUX_UDP_H */