1 #ifndef __LINUX_PIM_H 2 #define __LINUX_PIM_H 3 4 #include <linux/skbuff.h> 5 #include <asm/byteorder.h> 6 7 /* Message types - V1 */ 8 #define PIM_V1_VERSION cpu_to_be32(0x10000000) 9 #define PIM_V1_REGISTER 1 10 11 /* Message types - V2 */ 12 #define PIM_VERSION 2 13 14 /* RFC7761, sec 4.9: 15 * Type 16 * Types for specific PIM messages. PIM Types are: 17 * 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 23 * packet 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 29 * packet 30 * 8 = Candidate-RP-Advertisement Unicast to Domain's BSR 31 */ 32 enum { 33 PIM_TYPE_HELLO, 34 PIM_TYPE_REGISTER, 35 PIM_TYPE_REGISTER_STOP, 36 PIM_TYPE_JOIN_PRUNE, 37 PIM_TYPE_BOOTSTRAP, 38 PIM_TYPE_ASSERT, 39 PIM_TYPE_GRAFT, 40 PIM_TYPE_GRAFT_ACK, 41 PIM_TYPE_CANDIDATE_RP_ADV 42 }; 43 44 #define PIM_NULL_REGISTER cpu_to_be32(0x40000000) 45 46 /* RFC7761, sec 4.9: 47 * The PIM header common to all PIM messages is: 48 * 0 1 2 3 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 53 */ 54 struct pimhdr { 55 __u8 type; 56 __u8 reserved; 57 __be16 csum; 58 }; 59 60 /* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */ 61 struct pimreghdr { 62 __u8 type; 63 __u8 reserved; 64 __be16 csum; 65 __be32 flags; 66 }; 67 68 int pim_rcv_v1(struct sk_buff *skb); 69 70 static inline bool ipmr_pimsm_enabled(void) 71 { 72 return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2); 73 } 74 75 static inline struct pimhdr *pim_hdr(const struct sk_buff *skb) 76 { 77 return (struct pimhdr *)skb_transport_header(skb); 78 } 79 80 static inline u8 pim_hdr_version(const struct pimhdr *pimhdr) 81 { 82 return pimhdr->type >> 4; 83 } 84 85 static inline u8 pim_hdr_type(const struct pimhdr *pimhdr) 86 { 87 return pimhdr->type & 0xf; 88 } 89 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) 92 { 93 return addr == htonl(0xE000000D); 94 } 95 #endif 96