| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __LINUX_PIM_H |
| #define __LINUX_PIM_H |
| |
| #include <linux/skbuff.h> |
| #include <asm/byteorder.h> |
| |
| /* Message types - V1 */ |
| #define PIM_V1_VERSION cpu_to_be32(0x10000000) |
| #define PIM_V1_REGISTER 1 |
| |
| /* Message types - V2 */ |
| #define PIM_VERSION 2 |
| |
| /* RFC7761, sec 4.9: |
| * Type |
| * Types for specific PIM messages. PIM Types are: |
| * |
| * Message Type Destination |
| * --------------------------------------------------------------------- |
| * 0 = Hello Multicast to ALL-PIM-ROUTERS |
| * 1 = Register Unicast to RP |
| * 2 = Register-Stop Unicast to source of Register |
| * packet |
| * 3 = Join/Prune Multicast to ALL-PIM-ROUTERS |
| * 4 = Bootstrap Multicast to ALL-PIM-ROUTERS |
| * 5 = Assert Multicast to ALL-PIM-ROUTERS |
| * 6 = Graft (used in PIM-DM only) Unicast to RPF'(S) |
| * 7 = Graft-Ack (used in PIM-DM only) Unicast to source of Graft |
| * packet |
| * 8 = Candidate-RP-Advertisement Unicast to Domain's BSR |
| */ |
| enum { |
| PIM_TYPE_HELLO, |
| PIM_TYPE_REGISTER, |
| PIM_TYPE_REGISTER_STOP, |
| PIM_TYPE_JOIN_PRUNE, |
| PIM_TYPE_BOOTSTRAP, |
| PIM_TYPE_ASSERT, |
| PIM_TYPE_GRAFT, |
| PIM_TYPE_GRAFT_ACK, |
| PIM_TYPE_CANDIDATE_RP_ADV |
| }; |
| |
| #define PIM_NULL_REGISTER cpu_to_be32(0x40000000) |
| |
| /* RFC7761, sec 4.9: |
| * The PIM header common to all PIM messages is: |
| * 0 1 2 3 |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |PIM Ver| Type | Reserved | Checksum | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| struct pimhdr { |
| __u8 type; |
| __u8 reserved; |
| __be16 csum; |
| }; |
| |
| /* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */ |
| struct pimreghdr { |
| __u8 type; |
| __u8 reserved; |
| __be16 csum; |
| __be32 flags; |
| }; |
| |
| int pim_rcv_v1(struct sk_buff *skb); |
| |
| static inline bool ipmr_pimsm_enabled(void) |
| { |
| return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2); |
| } |
| |
| static inline struct pimhdr *pim_hdr(const struct sk_buff *skb) |
| { |
| return (struct pimhdr *)skb_transport_header(skb); |
| } |
| |
| static inline u8 pim_hdr_version(const struct pimhdr *pimhdr) |
| { |
| return pimhdr->type >> 4; |
| } |
| |
| static inline u8 pim_hdr_type(const struct pimhdr *pimhdr) |
| { |
| return pimhdr->type & 0xf; |
| } |
| |
| /* check if the address is 224.0.0.13, RFC7761 sec 4.3.1 */ |
| static inline bool pim_ipv4_all_pim_routers(__be32 addr) |
| { |
| return addr == htonl(0xE000000D); |
| } |
| #endif |
