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Commit 556d299f authored by Nikolay Aleksandrov's avatar Nikolay Aleksandrov Committed by David S. Miller
Browse files

net: pim: add common pimhdr struct and helpers 



Add the common pimhdr structure and helpers to access it, also cleanup the
format of the header file.

Signed-off-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f3a6f592

include/linux/pim.h

+36 −8
Original line number Diff line number Diff line 
#ifndef __LINUX_PIM_H

#define __LINUX_PIM_H



#include <linux/skbuff.h>

#include <asm/byteorder.h>



/* Message types - V1 */
@@ -13,20 +14,47 @@ 


#define PIM_NULL_REGISTER	cpu_to_be32(0x40000000)



static inline bool ipmr_pimsm_enabled(void)

{

	return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2);

}

/* RFC7761, sec 4.9:

 * The PIM header common to all PIM messages is:

 *   0                   1                   2                   3

 *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 *  |PIM Ver| Type  |   Reserved    |           Checksum            |

 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 */

struct pimhdr {

	__u8	type;

	__u8	reserved;

	__be16	csum;

};



/* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */

struct pimreghdr

{

struct pimreghdr {

	__u8	type;

	__u8	reserved;

	__be16	csum;

	__be32	flags;

};



struct sk_buff;

extern int pim_rcv_v1(struct sk_buff *);

int pim_rcv_v1(struct sk_buff *skb);



static inline bool ipmr_pimsm_enabled(void)

{

	return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2);

}



static inline struct pimhdr *pim_hdr(const struct sk_buff *skb)

{

	return (struct pimhdr *)skb_transport_header(skb);

}



static inline u8 pim_hdr_version(const struct pimhdr *pimhdr)

{

	return pimhdr->type >> 4;

}



static inline u8 pim_hdr_type(const struct pimhdr *pimhdr)

{

	return pimhdr->type & 0xf;

}

#endif