1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __LINUX_PIM_H |
3 | #define __LINUX_PIM_H |
4 | |
5 | #include <linux/skbuff.h> |
6 | #include <asm/byteorder.h> |
7 | |
8 | /* Message types - V1 */ |
9 | #define PIM_V1_VERSION cpu_to_be32(0x10000000) |
10 | #define PIM_V1_REGISTER 1 |
11 | |
12 | /* Message types - V2 */ |
13 | #define PIM_VERSION 2 |
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 | }; |
44 | |
45 | #define PIM_NULL_REGISTER cpu_to_be32(0x40000000) |
46 | |
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 | }; |
60 | |
61 | /* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */ |
62 | struct pimreghdr { |
63 | __u8 type; |
64 | __u8 reserved; |
65 | __be16 csum; |
66 | __be32 flags; |
67 | }; |
68 | |
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 | } |
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 | } |
96 | #endif |
97 | |