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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
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#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