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![Nikolay Aleksandrov](/assets/img/avatar_default.png)
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>
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
#ifndef __LINUX_PIM_H
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#define __LINUX_PIM_H
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#include <linux/skbuff.h>
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#include <asm/byteorder.h>
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/* Message types - V1 */
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#define PIM_V1_VERSION cpu_to_be32(0x10000000)
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#define PIM_V1_REGISTER 1
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/* Message types - V2 */
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#define PIM_VERSION 2
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#define PIM_REGISTER 1
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#define PIM_NULL_REGISTER cpu_to_be32(0x40000000)
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/* RFC7761, sec 4.9:
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* The PIM header common to all PIM messages is:
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |PIM Ver| Type | Reserved | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct pimhdr {
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__u8 type;
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__u8 reserved;
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__be16 csum;
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};
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/* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */
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struct pimreghdr {
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__u8 type;
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__u8 reserved;
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__be16 csum;
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__be32 flags;
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};
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int pim_rcv_v1(struct sk_buff *skb);
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static inline bool ipmr_pimsm_enabled(void)
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{
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return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2);
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}
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static inline struct pimhdr *pim_hdr(const struct sk_buff *skb)
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{
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return (struct pimhdr *)skb_transport_header(skb);
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}
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static inline u8 pim_hdr_version(const struct pimhdr *pimhdr)
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{
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return pimhdr->type >> 4;
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}
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static inline u8 pim_hdr_type(const struct pimhdr *pimhdr)
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{
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return pimhdr->type & 0xf;
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}
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#endif
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