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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: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2016-10-31 13:21:02 +01:00 committed by David S. Miller
parent f3a6f592e9
commit 556d299fcb
1 changed files with 36 additions and 8 deletions
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44
include/linux/pim.h
View File

@ -1,6 +1,7 @@
#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