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