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/*
* PIM for Quagga
* Copyright (C) 2008 Everton da Silva Marques
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef PIM_MSG_H
#define PIM_MSG_H
#include <netinet/in.h>
#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,
};
/*
* Network Order 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 {
uint8_t type : 4;
uint8_t ver : 4;
uint8_t Nbit : 1; /* No Fwd Bit */
uint8_t reserved : 7;
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_group_ipv4 {
uint8_t ne;
uint8_t family;
uint8_t bidir : 1; /* Bidir bit */
uint8_t reserved : 6; /* Reserved */
uint8_t sz : 1; /* scope zone bit */
uint8_t mask;
struct in_addr addr;
} __attribute__((packed));
struct pim_encoded_source_ipv4 {
uint8_t ne;
uint8_t family;
uint8_t bits;
uint8_t mask;
struct in_addr addr;
} __attribute__((packed));
struct pim_jp_groups {
struct pim_encoded_group_ipv4 g;
uint16_t joins;
uint16_t prunes;
struct pim_encoded_source_ipv4 s[1];
} __attribute__((packed));
struct pim_jp {
struct pim_msg_header header;
struct pim_encoded_ipv4_unicast addr;
uint8_t reserved;
uint8_t num_groups;
uint16_t holdtime;
struct pim_jp_groups groups[1];
} __attribute__((packed));
void pim_msg_build_header(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);
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 */
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