Functions
static int	send_mod_request (int fd, struct nlmsghdr *n)
	send_mod_request - send a linkinfo modification request More...

static int	send_dump_request (int fd, const char *name, int family, int type)
	send_dump_request - send a dump linkinfo request More...

static int	open_nl_sock ()
	open_nl_sock - open a netlink socket More...

static int	do_get_nl_link (int fd, __u8 acquire, const char name, void res)
	do_get_nl_link - get linkinfo More...

static int	get_link (const char name, __u8 acquire, void res)
	get_link - get linkinfo More...

static int	do_set_nl_link (int fd, __u8 if_state, const char name, struct req_info req_info)
	do_set_nl_link - setup linkinfo More...

static int	set_link (const char name, __u8 if_state, struct req_info req_info)
	set_link - open a netlink socket and setup linkinfo More...

Detailed Description

Function Documentation

◆ do_get_nl_link()

static int do_get_nl_link	(	int	fd,
		__u8	acquire,
		const char *	name,
		void *	res
	)

static

do_get_nl_link - get linkinfo

Parameters

fd	socket file descriptor to a priorly opened netlink socket
acquire	which parameter we want to get
name	name of the can device. This is the netdev name, as ifconfig -a shows in your system. usually it contains prefix "can" and the numer of the can line. e.g. "can0"
res	pointer to store the result

This callback send a dump request into the netlink layer, collect the packet containing the linkinfo and fill the pointer res points to depending on the acquire mode set in param acquire.

Returns: 0 if success; -1 if failed

Referenced by get_link().

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◆ do_set_nl_link()

static int do_set_nl_link	(	int	fd,
		__u8	if_state,
		const char *	name,
		struct req_info *	req_info
	)

static

do_set_nl_link - setup linkinfo

Parameters

fd	socket file descriptor to a priorly opened netlink socket
if_state	state of the interface we want to put the device into. this parameter is only set if you want to use the callback to driver up/down the device
name	name of the can device. This is the netdev name, as ifconfig -a shows in your system. usually it contains prefix "can" and the numer of the can line. e.g. "can0"
req_info	request parameters

This callback can do two different tasks:

bring up/down the interface
set up a netlink packet with request, as set up in req_info Which task this callback will do depends on which parameters are set.

Returns: 0 if success; -1 if failed

Referenced by set_link().

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◆ get_link()

static int get_link	(	const char *	name,
		__u8	acquire,
		void *	res
	)

static

get_link - get linkinfo

Parameters

name	name of the can device. This is the netdev name, as ifconfig -a shows in your system. usually it contains prefix "can" and the numer of the can line. e.g. "can0"
acquire	which parameter we want to get
res	pointer to store the result

This is a wrapper for do_get_nl_link

Returns: 0 if success; -1 if failed

References do_get_nl_link(), and open_nl_sock().

Referenced by can_get_berr_counter(), can_get_bittiming(), can_get_bittiming_const(), can_get_clock(), can_get_ctrlmode(), can_get_device_stats(), can_get_link_stats(), can_get_restart_ms(), and can_get_state().

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◆ open_nl_sock()

static int open_nl_sock ( )

static

open_nl_sock - open a netlink socket

opens a netlink socket and returns the socket descriptor

Returns: 0 if success; negativ if failed

Referenced by get_link(), and set_link().

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◆ send_dump_request()

static int send_dump_request	(	int	fd,
		const char *	name,
		int	family,
		int	type
	)

static

send_dump_request - send a dump linkinfo request

Parameters

fd	decriptor to a priorly opened netlink socket
name	network interface name, null means all interfaces
family	rt_gen message family
type	netlink message header type

Returns: 0 if success; negativ if failed

◆ send_mod_request()

static int send_mod_request	(	int	fd,
		struct nlmsghdr *	n
	)

static

send_mod_request - send a linkinfo modification request

Parameters

fd	decriptor to a priorly opened netlink socket
n	netlink message containing the request

sends a request to setup the the linkinfo to netlink layer and awaits the status.

Returns: 0 if success; negativ if failed

◆ set_link()

static int set_link	(	const char *	name,
		__u8	if_state,
		struct req_info *	req_info
	)

static

set_link - open a netlink socket and setup linkinfo

Parameters

name	name of the can device. This is the netdev name, as ifconfig -a shows in your system. usually it contains prefix "can" and the numer of the can line. e.g. "can0"
if_state	state of the interface we want to put the device into. this parameter is only set if you want to use the callback to driver up/down the device
req_info	request parameters

This is a wrapper for do_set_nl_link. It opens a netlink socket and sends down the requests.

Returns: 0 if success; -1 if failed

References do_set_nl_link(), and open_nl_sock().

Referenced by can_do_restart(), can_do_start(), can_do_stop(), can_set_bittiming(), can_set_ctrlmode(), and can_set_restart_ms().

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Functions

Detailed Description

Function Documentation

◆ do_get_nl_link()

◆ do_set_nl_link()

◆ get_link()

◆ open_nl_sock()

◆ send_dump_request()

◆ send_mod_request()

◆ set_link()