Getter & Setter

static __u8	ce_gw_get_ip_version (void *payload)
	Reads the first 4 bytes of IP-Header and detects the version. More...
struct can_frame *	ce_gw_get_header_can (canid_t can_id, __u8 can_dlc, __u8 *payload)
	builds a can header in SFF (standart frame format) or EFF (extended frame formate) with the given information More...

Detailed Description

Function Documentation

struct can_frame * ce_gw_get_header_can ( canid_t  can_id, __u8  can_dlc, __u8 *  payload  )

read

builds a can header in SFF (standart frame format) or EFF (extended frame formate) with the given information

Parameters

can_id_t	identifier (11/29 bits) + error flag (0=data, 1= error) + remote transmission flag (1=rtr frame) + frame format flag (0=SFF, 1=EFF)
can_dlc	data length code
payload	data (maximum 64 bit in an 8*8 array)

See Also

include/linux/can.h

Return values

can	frame if successful
NULL	if unsuccessful

Todo:

not tested yet

Definition at line 186 of file ce_gw_main.c.

References ce_gw_alloc_can_frame().

                                                 {
    struct can_frame *new_can_frame = ce_gw_alloc_can_frame();
    if (new_can_frame == NULL) {
        printk (KERN_ERR "ce_gw_main.c: kmalloc failed in function"
                "ce_gw_get_header_can \n");
        return NULL;
    }
    new_can_frame->can_id = can_id;
    new_can_frame->can_dlc = can_dlc;
    *(u64 *)new_can_frame->data = *(u64 *)payload;
    return new_can_frame;
}

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static __u8 ce_gw_get_ip_version ( void *  payload )

static

Reads the first 4 bytes of IP-Header and detects the version.

Parameters

payload

Layer 2 Payload with IP-Header

Return values

4	if it is a IPv4 Header
6	if it is a IPv6 Header
0	else

Definition at line 746 of file ce_gw_main.c.

{
    __u8 version = *(__u8 *)payload & 0xF0;
    if (version == 0x40) {
        return 4;
    } else if (version == 0x60) {
        return 6;
    } else {
        return 0;
    }
}