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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_PIM_H
#define __LINUX_PIM_H
#include <linux/skbuff.h>
#include <asm/byteorder.h>
/* Message types - V1 */
#define PIM_V1_VERSION cpu_to_be32(0x10000000)
#define PIM_V1_REGISTER 1
/* Message types - V2 */
#define PIM_VERSION 2
/* RFC7761, sec 4.9:
* Type
* Types for specific PIM messages. PIM Types are:
*
* Message Type Destination
* ---------------------------------------------------------------------
* 0 = Hello Multicast to ALL-PIM-ROUTERS
* 1 = Register Unicast to RP
* 2 = Register-Stop Unicast to source of Register
* packet
* 3 = Join/Prune Multicast to ALL-PIM-ROUTERS
* 4 = Bootstrap Multicast to ALL-PIM-ROUTERS
* 5 = Assert Multicast to ALL-PIM-ROUTERS
* 6 = Graft (used in PIM-DM only) Unicast to RPF'(S)
* 7 = Graft-Ack (used in PIM-DM only) Unicast to source of Graft
* packet
* 8 = Candidate-RP-Advertisement Unicast to Domain's BSR
*/
enum {
PIM_TYPE_HELLO,
PIM_TYPE_REGISTER,
PIM_TYPE_REGISTER_STOP,
PIM_TYPE_JOIN_PRUNE,
PIM_TYPE_BOOTSTRAP,
PIM_TYPE_ASSERT,
PIM_TYPE_GRAFT,
PIM_TYPE_GRAFT_ACK,
PIM_TYPE_CANDIDATE_RP_ADV
};
#define PIM_NULL_REGISTER cpu_to_be32(0x40000000)
/* 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 {
__u8 type;
__u8 reserved;
__be16 csum;
__be32 flags;
};
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;
}
/* check if the address is 224.0.0.13, RFC7761 sec 4.3.1 */
static inline bool pim_ipv4_all_pim_routers(__be32 addr)
{
return addr == htonl(0xE000000D);
}
#endif
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