4 #include <linux/skbuff.h>
5 #include <asm/byteorder.h>
7 /* Message types - V1 */
8 #define PIM_V1_VERSION cpu_to_be32(0x10000000)
9 #define PIM_V1_REGISTER 1
11 /* Message types - V2 */
16 * Types for specific PIM messages. PIM Types are:
18 * Message Type Destination
19 * ---------------------------------------------------------------------
20 * 0 = Hello Multicast to ALL-PIM-ROUTERS
21 * 1 = Register Unicast to RP
22 * 2 = Register-Stop Unicast to source of Register
24 * 3 = Join/Prune Multicast to ALL-PIM-ROUTERS
25 * 4 = Bootstrap Multicast to ALL-PIM-ROUTERS
26 * 5 = Assert Multicast to ALL-PIM-ROUTERS
27 * 6 = Graft (used in PIM-DM only) Unicast to RPF'(S)
28 * 7 = Graft-Ack (used in PIM-DM only) Unicast to source of Graft
30 * 8 = Candidate-RP-Advertisement Unicast to Domain's BSR
35 PIM_TYPE_REGISTER_STOP,
41 PIM_TYPE_CANDIDATE_RP_ADV
44 #define PIM_NULL_REGISTER cpu_to_be32(0x40000000)
47 * The PIM header common to all PIM messages is:
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
50 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
51 * |PIM Ver| Type | Reserved | Checksum |
52 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
60 /* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */
68 int pim_rcv_v1(struct sk_buff *skb);
70 static inline bool ipmr_pimsm_enabled(void)
72 return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2);
75 static inline struct pimhdr *pim_hdr(const struct sk_buff *skb)
77 return (struct pimhdr *)skb_transport_header(skb);
80 static inline u8 pim_hdr_version(const struct pimhdr *pimhdr)
82 return pimhdr->type >> 4;
85 static inline u8 pim_hdr_type(const struct pimhdr *pimhdr)
87 return pimhdr->type & 0xf;
90 /* check if the address is 224.0.0.13, RFC7761 sec 4.3.1 */
91 static inline bool pim_ipv4_all_pim_routers(__be32 addr)
93 return addr == htonl(0xE000000D);