Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
YOSHIFUJI Hideaki | 2e80462 | 2008-04-03 09:22:09 +0900 | [diff] [blame] | 2 | #ifndef __LINUX_PIM_H |
| 3 | #define __LINUX_PIM_H |
| 4 | |
Nikolay Aleksandrov | 556d299 | 2016-10-31 13:21:02 +0100 | [diff] [blame] | 5 | #include <linux/skbuff.h> |
YOSHIFUJI Hideaki | 2e80462 | 2008-04-03 09:22:09 +0900 | [diff] [blame] | 6 | #include <asm/byteorder.h> |
| 7 | |
YOSHIFUJI Hideaki | 2e80462 | 2008-04-03 09:22:09 +0900 | [diff] [blame] | 8 | /* Message types - V1 */ |
Harvey Harrison | f3a7c66 | 2009-02-14 22:58:35 -0800 | [diff] [blame] | 9 | #define PIM_V1_VERSION cpu_to_be32(0x10000000) |
YOSHIFUJI Hideaki | 2e80462 | 2008-04-03 09:22:09 +0900 | [diff] [blame] | 10 | #define PIM_V1_REGISTER 1 |
| 11 | |
| 12 | /* Message types - V2 */ |
| 13 | #define PIM_VERSION 2 |
Nikolay Aleksandrov | 56245ca | 2016-10-31 13:21:04 +0100 | [diff] [blame] | 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 | }; |
YOSHIFUJI Hideaki | 2e80462 | 2008-04-03 09:22:09 +0900 | [diff] [blame] | 44 | |
Harvey Harrison | f3a7c66 | 2009-02-14 22:58:35 -0800 | [diff] [blame] | 45 | #define PIM_NULL_REGISTER cpu_to_be32(0x40000000) |
YOSHIFUJI Hideaki | 2e80462 | 2008-04-03 09:22:09 +0900 | [diff] [blame] | 46 | |
Nikolay Aleksandrov | 556d299 | 2016-10-31 13:21:02 +0100 | [diff] [blame] | 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 | }; |
Nikolay Aleksandrov | 1973a4e | 2015-11-26 15:23:48 +0100 | [diff] [blame] | 60 | |
YOSHIFUJI Hideaki | 2e80462 | 2008-04-03 09:22:09 +0900 | [diff] [blame] | 61 | /* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */ |
Nikolay Aleksandrov | 556d299 | 2016-10-31 13:21:02 +0100 | [diff] [blame] | 62 | struct pimreghdr { |
YOSHIFUJI Hideaki | 2e80462 | 2008-04-03 09:22:09 +0900 | [diff] [blame] | 63 | __u8 type; |
| 64 | __u8 reserved; |
| 65 | __be16 csum; |
| 66 | __be32 flags; |
| 67 | }; |
| 68 | |
Nikolay Aleksandrov | 556d299 | 2016-10-31 13:21:02 +0100 | [diff] [blame] | 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 | } |
Nikolay Aleksandrov | 20bb6ce | 2016-10-31 13:21:03 +0100 | [diff] [blame] | 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 | } |
YOSHIFUJI Hideaki | 2e80462 | 2008-04-03 09:22:09 +0900 | [diff] [blame] | 96 | #endif |