p2p_utils.c File Reference

P2P - generic helper functions. More...

#include "includes.h"
#include "common.h"
#include "common/defs.h"
#include "common/ieee802_11_common.h"
#include "p2p_i.h"

Functions
int	p2p_random (char *buf, size_t len)
	Generate random string for SSID and passphrase. More...
int	p2p_channel_to_freq (int op_class, int channel)
	Convert channel info to frequency. More...
int	p2p_freq_to_channel (unsigned int freq, u8 *op_class, u8 *channel)
	Convert frequency into channel info. More...
void	p2p_channels_intersect (const struct p2p_channels *a, const struct p2p_channels *b, struct p2p_channels *res)
	Intersection of supported channel lists. More...
void	p2p_channels_union_inplace (struct p2p_channels *res, const struct p2p_channels *b)
	Inplace union of channel lists. More...
void	p2p_channels_union (const struct p2p_channels *a, const struct p2p_channels *b, struct p2p_channels *res)
	Union of channel lists. More...
void	p2p_channels_remove_freqs (struct p2p_channels *chan, const struct wpa_freq_range_list *list)
int	p2p_channels_includes (const struct p2p_channels *channels, u8 reg_class, u8 channel)
	Check whether a channel is included in the list. More...
int	p2p_channels_includes_freq (const struct p2p_channels *channels, unsigned int freq)
int	p2p_supported_freq (struct p2p_data *p2p, unsigned int freq)
	Check whether channel is supported for P2P. More...
int	p2p_supported_freq_go (struct p2p_data *p2p, unsigned int freq)
	Check whether channel is supported for P2P GO operation. More...
int	p2p_supported_freq_cli (struct p2p_data *p2p, unsigned int freq)
	Check whether channel is supported for P2P client operation. More...
unsigned int	p2p_get_pref_freq (struct p2p_data *p2p, const struct p2p_channels *channels)
	Get channel from preferred channel list. More...
void	p2p_channels_dump (struct p2p_data *p2p, const char *title, const struct p2p_channels *chan)
int	p2p_channel_select (struct p2p_channels *chans, const int *classes, u8 *op_class, u8 *op_channel)
int	p2p_channel_random_social (struct p2p_channels *chans, u8 *op_class, u8 *op_channel)
int	p2p_channels_to_freqs (const struct p2p_channels *channels, int *freq_list, unsigned int max_len)

Detailed Description

P2P - generic helper functions.

Function Documentation

int p2p_channel_to_freq	(	int	op_class,
		int	channel
	)

Convert channel info to frequency.

Parameters

op_class	Operating class
channel	Channel number

Returns

Frequency in MHz or -1 if the specified channel is unknown

int p2p_channels_includes	(	const struct p2p_channels *	channels,
		u8	reg_class,
		u8	channel
	)

Check whether a channel is included in the list.

Parameters

channels	List of supported channels
reg_class	Regulatory class of the channel to search
channel	Channel number of the channel to search

Returns

1 if channel was found or 0 if not

void p2p_channels_intersect	(	const struct p2p_channels *	a,
		const struct p2p_channels *	b,
		struct p2p_channels *	res
	)

Intersection of supported channel lists.

Parameters

a	First set of supported channels
b	Second set of supported channels
res	Data structure for returning the intersection of support channels

This function can be used to find a common set of supported channels. Both input channels sets are assumed to use the same country code. If different country codes are used, the regulatory class numbers may not be matched correctly and results are undefined.

void p2p_channels_union	(	const struct p2p_channels *	a,
		const struct p2p_channels *	b,
		struct p2p_channels *	res
	)

Union of channel lists.

Parameters

a	First set of channels
b	Second set of channels
res	Data structure for returning the union of channels

void p2p_channels_union_inplace	(	struct p2p_channels *	res,
		const struct p2p_channels *	b
	)

Inplace union of channel lists.

Parameters

res	Input data and place for returning union of the channel sets
b	Second set of channels

int p2p_freq_to_channel	(	unsigned int	freq,
		u8 *	op_class,
		u8 *	channel
	)

Convert frequency into channel info.

Parameters

op_class	Buffer for returning operating class
channel	Buffer for returning channel number

Returns

0 on success, -1 if the specified frequency is unknown

unsigned int p2p_get_pref_freq	(	struct p2p_data *	p2p,
		const struct p2p_channels *	channels
	)

Get channel from preferred channel list.

Parameters

p2p	P2P module context from p2p_init()
channels	List of channels

Returns

Preferred channel

int p2p_random	(	char *	buf,
		size_t	len
	)

Generate random string for SSID and passphrase.

Parameters

buf	Buffer for returning the result
len	Number of octets to write to the buffer

Returns

0 on success, -1 on failure

This function generates a random string using the following character set: 'A'-'Z', 'a'-'z', '0'-'9'.

int p2p_supported_freq	(	struct p2p_data *	p2p,
		unsigned int	freq
	)

Check whether channel is supported for P2P.

Parameters

p2p	P2P module context from p2p_init()
freq	Channel frequency in MHz

Returns

0 if channel not usable for P2P, 1 if usable for P2P

int p2p_supported_freq_cli	(	struct p2p_data *	p2p,
		unsigned int	freq
	)

Check whether channel is supported for P2P client operation.

Parameters

p2p	P2P module context from p2p_init()
freq	Channel frequency in MHz

Returns

0 if channel not usable for P2P, 1 if usable for P2P

int p2p_supported_freq_go	(	struct p2p_data *	p2p,
		unsigned int	freq
	)

Check whether channel is supported for P2P GO operation.

Parameters

p2p	P2P module context from p2p_init()
freq	Channel frequency in MHz

Returns

0 if channel not usable for P2P, 1 if usable for P2P