1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */
22e804627SYOSHIFUJI Hideaki #ifndef __LINUX_PIM_H
32e804627SYOSHIFUJI Hideaki #define __LINUX_PIM_H
42e804627SYOSHIFUJI Hideaki
5556d299fSNikolay Aleksandrov #include <linux/skbuff.h>
62e804627SYOSHIFUJI Hideaki #include <asm/byteorder.h>
72e804627SYOSHIFUJI Hideaki
82e804627SYOSHIFUJI Hideaki /* Message types - V1 */
9f3a7c66bSHarvey Harrison #define PIM_V1_VERSION cpu_to_be32(0x10000000)
102e804627SYOSHIFUJI Hideaki #define PIM_V1_REGISTER 1
112e804627SYOSHIFUJI Hideaki
122e804627SYOSHIFUJI Hideaki /* Message types - V2 */
132e804627SYOSHIFUJI Hideaki #define PIM_VERSION 2
1456245caeSNikolay Aleksandrov
1556245caeSNikolay Aleksandrov /* RFC7761, sec 4.9:
1656245caeSNikolay Aleksandrov * Type
1756245caeSNikolay Aleksandrov * Types for specific PIM messages. PIM Types are:
1856245caeSNikolay Aleksandrov *
1956245caeSNikolay Aleksandrov * Message Type Destination
2056245caeSNikolay Aleksandrov * ---------------------------------------------------------------------
2156245caeSNikolay Aleksandrov * 0 = Hello Multicast to ALL-PIM-ROUTERS
2256245caeSNikolay Aleksandrov * 1 = Register Unicast to RP
2356245caeSNikolay Aleksandrov * 2 = Register-Stop Unicast to source of Register
2456245caeSNikolay Aleksandrov * packet
2556245caeSNikolay Aleksandrov * 3 = Join/Prune Multicast to ALL-PIM-ROUTERS
2656245caeSNikolay Aleksandrov * 4 = Bootstrap Multicast to ALL-PIM-ROUTERS
2756245caeSNikolay Aleksandrov * 5 = Assert Multicast to ALL-PIM-ROUTERS
2856245caeSNikolay Aleksandrov * 6 = Graft (used in PIM-DM only) Unicast to RPF'(S)
2956245caeSNikolay Aleksandrov * 7 = Graft-Ack (used in PIM-DM only) Unicast to source of Graft
3056245caeSNikolay Aleksandrov * packet
3156245caeSNikolay Aleksandrov * 8 = Candidate-RP-Advertisement Unicast to Domain's BSR
3256245caeSNikolay Aleksandrov */
3356245caeSNikolay Aleksandrov enum {
3456245caeSNikolay Aleksandrov PIM_TYPE_HELLO,
3556245caeSNikolay Aleksandrov PIM_TYPE_REGISTER,
3656245caeSNikolay Aleksandrov PIM_TYPE_REGISTER_STOP,
3756245caeSNikolay Aleksandrov PIM_TYPE_JOIN_PRUNE,
3856245caeSNikolay Aleksandrov PIM_TYPE_BOOTSTRAP,
3956245caeSNikolay Aleksandrov PIM_TYPE_ASSERT,
4056245caeSNikolay Aleksandrov PIM_TYPE_GRAFT,
4156245caeSNikolay Aleksandrov PIM_TYPE_GRAFT_ACK,
4256245caeSNikolay Aleksandrov PIM_TYPE_CANDIDATE_RP_ADV
4356245caeSNikolay Aleksandrov };
442e804627SYOSHIFUJI Hideaki
45f3a7c66bSHarvey Harrison #define PIM_NULL_REGISTER cpu_to_be32(0x40000000)
462e804627SYOSHIFUJI Hideaki
47556d299fSNikolay Aleksandrov /* RFC7761, sec 4.9:
48556d299fSNikolay Aleksandrov * The PIM header common to all PIM messages is:
49556d299fSNikolay Aleksandrov * 0 1 2 3
50556d299fSNikolay Aleksandrov * 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
51556d299fSNikolay Aleksandrov * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
52556d299fSNikolay Aleksandrov * |PIM Ver| Type | Reserved | Checksum |
53556d299fSNikolay Aleksandrov * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
54556d299fSNikolay Aleksandrov */
55556d299fSNikolay Aleksandrov struct pimhdr {
56556d299fSNikolay Aleksandrov __u8 type;
57556d299fSNikolay Aleksandrov __u8 reserved;
58556d299fSNikolay Aleksandrov __be16 csum;
59556d299fSNikolay Aleksandrov };
601973a4eaSNikolay Aleksandrov
612e804627SYOSHIFUJI Hideaki /* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */
62556d299fSNikolay Aleksandrov struct pimreghdr {
632e804627SYOSHIFUJI Hideaki __u8 type;
642e804627SYOSHIFUJI Hideaki __u8 reserved;
652e804627SYOSHIFUJI Hideaki __be16 csum;
662e804627SYOSHIFUJI Hideaki __be32 flags;
672e804627SYOSHIFUJI Hideaki };
682e804627SYOSHIFUJI Hideaki
69556d299fSNikolay Aleksandrov int pim_rcv_v1(struct sk_buff *skb);
70556d299fSNikolay Aleksandrov
ipmr_pimsm_enabled(void)71556d299fSNikolay Aleksandrov static inline bool ipmr_pimsm_enabled(void)
72556d299fSNikolay Aleksandrov {
73556d299fSNikolay Aleksandrov return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2);
74556d299fSNikolay Aleksandrov }
75556d299fSNikolay Aleksandrov
pim_hdr(const struct sk_buff * skb)76556d299fSNikolay Aleksandrov static inline struct pimhdr *pim_hdr(const struct sk_buff *skb)
77556d299fSNikolay Aleksandrov {
78556d299fSNikolay Aleksandrov return (struct pimhdr *)skb_transport_header(skb);
79556d299fSNikolay Aleksandrov }
80556d299fSNikolay Aleksandrov
pim_hdr_version(const struct pimhdr * pimhdr)81556d299fSNikolay Aleksandrov static inline u8 pim_hdr_version(const struct pimhdr *pimhdr)
82556d299fSNikolay Aleksandrov {
83556d299fSNikolay Aleksandrov return pimhdr->type >> 4;
84556d299fSNikolay Aleksandrov }
85556d299fSNikolay Aleksandrov
pim_hdr_type(const struct pimhdr * pimhdr)86556d299fSNikolay Aleksandrov static inline u8 pim_hdr_type(const struct pimhdr *pimhdr)
87556d299fSNikolay Aleksandrov {
88556d299fSNikolay Aleksandrov return pimhdr->type & 0xf;
89556d299fSNikolay Aleksandrov }
9020bb6ce9SNikolay Aleksandrov
9120bb6ce9SNikolay Aleksandrov /* check if the address is 224.0.0.13, RFC7761 sec 4.3.1 */
pim_ipv4_all_pim_routers(__be32 addr)9220bb6ce9SNikolay Aleksandrov static inline bool pim_ipv4_all_pim_routers(__be32 addr)
9320bb6ce9SNikolay Aleksandrov {
9420bb6ce9SNikolay Aleksandrov return addr == htonl(0xE000000D);
9520bb6ce9SNikolay Aleksandrov }
962e804627SYOSHIFUJI Hideaki #endif
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