/* SPDX-License-Identifier: GPL-2.0 */
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#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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/* RFC7761, sec 4.9:
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* Type
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* Types for specific PIM messages. PIM Types are:
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*
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* Message Type Destination
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* ---------------------------------------------------------------------
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* 0 = Hello Multicast to ALL-PIM-ROUTERS
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* 1 = Register Unicast to RP
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* 2 = Register-Stop Unicast to source of Register
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* packet
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* 3 = Join/Prune Multicast to ALL-PIM-ROUTERS
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* 4 = Bootstrap Multicast to ALL-PIM-ROUTERS
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* 5 = Assert Multicast to ALL-PIM-ROUTERS
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* 6 = Graft (used in PIM-DM only) Unicast to RPF'(S)
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* 7 = Graft-Ack (used in PIM-DM only) Unicast to source of Graft
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* packet
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* 8 = Candidate-RP-Advertisement Unicast to Domain's BSR
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*/
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enum {
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PIM_TYPE_HELLO,
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PIM_TYPE_REGISTER,
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PIM_TYPE_REGISTER_STOP,
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PIM_TYPE_JOIN_PRUNE,
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PIM_TYPE_BOOTSTRAP,
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PIM_TYPE_ASSERT,
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PIM_TYPE_GRAFT,
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PIM_TYPE_GRAFT_ACK,
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PIM_TYPE_CANDIDATE_RP_ADV
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};
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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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/* check if the address is 224.0.0.13, RFC7761 sec 4.3.1 */
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static inline bool pim_ipv4_all_pim_routers(__be32 addr)
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{
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return addr == htonl(0xE000000D);
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}
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#endif
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