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pim_msg.h
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PIM for Quagga
* Copyright (C) 2008 Everton da Silva Marques
*/
#ifndef PIM_MSG_H
#define PIM_MSG_H
#include <netinet/in.h>
#if PIM_IPV == 6
#include <netinet/ip6.h>
#endif
#include "pim_jp_agg.h"
#define PIM_HDR_LEN sizeof(struct pim_msg_header)
/*
Number Description
---------- ------------------
0 Reserved
1 IP (IP version 4)
2 IP6 (IP version 6)
From:
http://www.iana.org/assignments/address-family-numbers
*/
enum pim_msg_address_family {
PIM_MSG_ADDRESS_FAMILY_RESERVED,
PIM_MSG_ADDRESS_FAMILY_IPV4,
PIM_MSG_ADDRESS_FAMILY_IPV6,
};
/*
* pim_msg_hdr
* =========================
* PIM Header definition as per RFC 5059. N bit introduced to indicate
* do-not-forward option in PIM Boot strap Message.
* 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 |N| Reserved | Checksum |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct pim_msg_header {
#if (BYTE_ORDER == LITTLE_ENDIAN)
uint8_t type : 4;
uint8_t ver : 4;
uint8_t reserved : 7;
uint8_t Nbit : 1; /* No Fwd Bit */
#elif (BYTE_ORDER == BIG_ENDIAN)
uint8_t ver : 4;
uint8_t type : 4;
uint8_t Nbit : 1; /* No Fwd Bit */
uint8_t reserved : 7;
#else
#error"Please set byte order"
#endif
uint16_t checksum;
} __attribute__((packed));
struct pim_encoded_ipv4_unicast {
uint8_t family;
uint8_t reserved;
struct in_addr addr;
} __attribute__((packed));
struct pim_encoded_ipv6_unicast {
uint8_t family;
uint8_t reserved;
struct in6_addr addr;
} __attribute__((packed));
/*
* Encoded Group format. RFC 4601 Sec 4.9.1
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Addr Family | Encoding Type |B| Reserved |Z| Mask Len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Group multicast Address
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+...
*/
struct pim_encoded_group_ipv4 {
uint8_t family;
uint8_t ne;
#if (BYTE_ORDER == LITTLE_ENDIAN)
uint8_t sz : 1; /* scope zone bit */
uint8_t reserved : 6; /* Reserved */
uint8_t bidir : 1; /* Bidir bit */
#elif (BYTE_ORDER == BIG_ENDIAN)
uint8_t bidir : 1; /* Bidir bit */
uint8_t reserved : 6; /* Reserved */
uint8_t sz : 1; /* scope zone bit */
#else
#error"Please set byte order"
#endif
uint8_t mask;
struct in_addr addr;
} __attribute__((packed));
struct pim_encoded_group_ipv6 {
uint8_t family;
uint8_t ne;
#if (BYTE_ORDER == LITTLE_ENDIAN)
uint8_t sz : 1; /* scope zone bit */
uint8_t reserved : 6; /* Reserved */
uint8_t bidir : 1; /* Bidir bit */
#elif (BYTE_ORDER == BIG_ENDIAN)
uint8_t bidir : 1; /* Bidir bit */
uint8_t reserved : 6; /* Reserved */
uint8_t sz : 1; /* scope zone bit */
#else
#error "Please set byte order"
#endif
uint8_t mask;
struct in6_addr addr;
} __attribute__((packed));
/*
* Encoded Source format. RFC 4601 Sec 4.9.1
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Source Address
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...
*/
struct pim_encoded_source_ipv4 {
uint8_t family;
uint8_t ne;
uint8_t bits;
uint8_t mask;
struct in_addr addr;
} __attribute__((packed));
struct pim_encoded_source_ipv6 {
uint8_t family;
uint8_t ne;
uint8_t bits;
uint8_t mask;
struct in6_addr addr;
} __attribute__((packed));
/* clang-format off */
#if PIM_IPV == 4
typedef struct pim_encoded_ipv4_unicast pim_encoded_unicast;
typedef struct pim_encoded_group_ipv4 pim_encoded_group;
typedef struct pim_encoded_source_ipv4 pim_encoded_source;
#define PIM_MSG_ADDRESS_FAMILY PIM_MSG_ADDRESS_FAMILY_IPV4
typedef struct ip ipv_hdr;
#define IPV_SRC(ip_hdr) ((ip_hdr))->ip_src
#define IPV_DST(ip_hdr) ((ip_hdr))->ip_dst
#define IPV_LEN(ip_hdr) ((ip_hdr))->ip_len
#else
typedef struct pim_encoded_ipv6_unicast pim_encoded_unicast;
typedef struct pim_encoded_group_ipv6 pim_encoded_group;
typedef struct pim_encoded_source_ipv6 pim_encoded_source;
#define PIM_MSG_ADDRESS_FAMILY PIM_MSG_ADDRESS_FAMILY_IPV6
typedef struct ip6_hdr ipv_hdr;
#define IPV_SRC(ip_hdr) ((ip_hdr))->ip6_src
#define IPV_DST(ip_hdr) ((ip_hdr))->ip6_dst
#define IPV_LEN(ip_hdr) ((ip_hdr))->ip6_plen
#endif
/* clang-format on */
struct pim_jp_groups {
pim_encoded_group g;
uint16_t joins;
uint16_t prunes;
pim_encoded_source s[1];
} __attribute__((packed));
struct pim_jp {
struct pim_msg_header header;
pim_encoded_unicast addr;
uint8_t reserved;
uint8_t num_groups;
uint16_t holdtime;
struct pim_jp_groups groups[1];
} __attribute__((packed));
#if PIM_IPV == 4
static inline pim_sgaddr pim_sgaddr_from_iphdr(const void *iphdr)
{
const struct ip *ipv4_hdr = iphdr;
pim_sgaddr sg;
sg.src = ipv4_hdr->ip_src;
sg.grp = ipv4_hdr->ip_dst;
return sg;
}
#else
static inline pim_sgaddr pim_sgaddr_from_iphdr(const void *iphdr)
{
const struct ip6_hdr *ipv6_hdr = iphdr;
pim_sgaddr sg;
sg.src = ipv6_hdr->ip6_src;
sg.grp = ipv6_hdr->ip6_dst;
return sg;
}
#endif
void pim_msg_build_header(pim_addr src, pim_addr dst, uint8_t *pim_msg,
size_t pim_msg_size, uint8_t pim_msg_type,
bool no_fwd);
uint8_t *pim_msg_addr_encode_ipv4_ucast(uint8_t *buf, struct in_addr addr);
uint8_t *pim_msg_addr_encode_ipv4_group(uint8_t *buf, struct in_addr addr);
#define PIM_ENCODE_SPARSE_BIT 0x04
#define PIM_ENCODE_WC_BIT 0x02
#define PIM_ENCODE_RPT_BIT 0x01
uint8_t *pim_msg_addr_encode_ipv4_source(uint8_t *buf, struct in_addr addr,
uint8_t bits);
uint8_t *pim_msg_addr_encode_ipv6_ucast(uint8_t *buf, struct in6_addr addr);
uint8_t *pim_msg_addr_encode_ipv6_group(uint8_t *buf, struct in6_addr addr);
uint8_t *pim_msg_addr_encode_ipv6_source(uint8_t *buf, struct in6_addr addr,
uint8_t bits);
uint8_t *pim_msg_addr_encode_ucast(uint8_t *buf, pim_addr addr);
uint8_t *pim_msg_addr_encode_group(uint8_t *buf, pim_addr addr);
uint8_t *pim_msg_addr_encode_source(uint8_t *buf, pim_addr addr, uint8_t bits);
size_t pim_msg_get_jp_group_size(struct list *sources);
size_t pim_msg_build_jp_groups(struct pim_jp_groups *grp,
struct pim_jp_agg_group *sgs, size_t size);
#endif /* PIM_MSG_H */