Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2e804627 YH |
2 | #ifndef __LINUX_PIM_H |
3 | #define __LINUX_PIM_H | |
4 | ||
556d299f | 5 | #include <linux/skbuff.h> |
2e804627 YH |
6 | #include <asm/byteorder.h> |
7 | ||
8 | /* Message types - V1 */ | |
f3a7c66b | 9 | #define PIM_V1_VERSION cpu_to_be32(0x10000000) |
2e804627 YH |
10 | #define PIM_V1_REGISTER 1 |
11 | ||
12 | /* Message types - V2 */ | |
13 | #define PIM_VERSION 2 | |
56245cae NA |
14 | |
15 | /* RFC7761, sec 4.9: | |
16 | * Type | |
17 | * Types for specific PIM messages. PIM Types are: | |
18 | * | |
19 | * Message Type Destination | |
20 | * --------------------------------------------------------------------- | |
21 | * 0 = Hello Multicast to ALL-PIM-ROUTERS | |
22 | * 1 = Register Unicast to RP | |
23 | * 2 = Register-Stop Unicast to source of Register | |
24 | * packet | |
25 | * 3 = Join/Prune Multicast to ALL-PIM-ROUTERS | |
26 | * 4 = Bootstrap Multicast to ALL-PIM-ROUTERS | |
27 | * 5 = Assert Multicast to ALL-PIM-ROUTERS | |
28 | * 6 = Graft (used in PIM-DM only) Unicast to RPF'(S) | |
29 | * 7 = Graft-Ack (used in PIM-DM only) Unicast to source of Graft | |
30 | * packet | |
31 | * 8 = Candidate-RP-Advertisement Unicast to Domain's BSR | |
32 | */ | |
33 | enum { | |
34 | PIM_TYPE_HELLO, | |
35 | PIM_TYPE_REGISTER, | |
36 | PIM_TYPE_REGISTER_STOP, | |
37 | PIM_TYPE_JOIN_PRUNE, | |
38 | PIM_TYPE_BOOTSTRAP, | |
39 | PIM_TYPE_ASSERT, | |
40 | PIM_TYPE_GRAFT, | |
41 | PIM_TYPE_GRAFT_ACK, | |
42 | PIM_TYPE_CANDIDATE_RP_ADV | |
43 | }; | |
2e804627 | 44 | |
f3a7c66b | 45 | #define PIM_NULL_REGISTER cpu_to_be32(0x40000000) |
2e804627 | 46 | |
556d299f NA |
47 | /* RFC7761, sec 4.9: |
48 | * The PIM header common to all PIM messages is: | |
49 | * 0 1 2 3 | |
50 | * 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 | |
51 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
52 | * |PIM Ver| Type | Reserved | Checksum | | |
53 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
54 | */ | |
55 | struct pimhdr { | |
56 | __u8 type; | |
57 | __u8 reserved; | |
58 | __be16 csum; | |
59 | }; | |
1973a4ea | 60 | |
2e804627 | 61 | /* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */ |
556d299f | 62 | struct pimreghdr { |
2e804627 YH |
63 | __u8 type; |
64 | __u8 reserved; | |
65 | __be16 csum; | |
66 | __be32 flags; | |
67 | }; | |
68 | ||
556d299f NA |
69 | int pim_rcv_v1(struct sk_buff *skb); |
70 | ||
71 | static inline bool ipmr_pimsm_enabled(void) | |
72 | { | |
73 | return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2); | |
74 | } | |
75 | ||
76 | static inline struct pimhdr *pim_hdr(const struct sk_buff *skb) | |
77 | { | |
78 | return (struct pimhdr *)skb_transport_header(skb); | |
79 | } | |
80 | ||
81 | static inline u8 pim_hdr_version(const struct pimhdr *pimhdr) | |
82 | { | |
83 | return pimhdr->type >> 4; | |
84 | } | |
85 | ||
86 | static inline u8 pim_hdr_type(const struct pimhdr *pimhdr) | |
87 | { | |
88 | return pimhdr->type & 0xf; | |
89 | } | |
20bb6ce9 NA |
90 | |
91 | /* check if the address is 224.0.0.13, RFC7761 sec 4.3.1 */ | |
92 | static inline bool pim_ipv4_all_pim_routers(__be32 addr) | |
93 | { | |
94 | return addr == htonl(0xE000000D); | |
95 | } | |
2e804627 | 96 | #endif |