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/*
* OSPF Sending and Receiving OSPF Packets.
* Copyright (C) 1999 Toshiaki Takada
*
* This file is part of GNU Zebra.
*
* GNU Zebra 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, or (at your option) any
* later version.
*
* GNU Zebra 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 _ZEBRA_OSPF_PACKET_H
#define _ZEBRA_OSPF_PACKET_H
#define OSPF_HEADER_SIZE 24U
#define OSPF_AUTH_SIMPLE_SIZE 8U
#define OSPF_AUTH_MD5_SIZE 16U
#define OSPF_MAX_PACKET_SIZE 65535U /* includes IP Header size. */
#define OSPF_HELLO_MIN_SIZE 20U /* not including neighbors */
#define OSPF_DB_DESC_MIN_SIZE 8U
#define OSPF_LS_REQ_MIN_SIZE 0U
#define OSPF_LS_UPD_MIN_SIZE 4U
#define OSPF_LS_ACK_MIN_SIZE 0U
#define OSPF_MSG_HELLO 1 /* OSPF Hello Message. */
#define OSPF_MSG_DB_DESC 2 /* OSPF Database Descriptoin Message. */
#define OSPF_MSG_LS_REQ 3 /* OSPF Link State Request Message. */
#define OSPF_MSG_LS_UPD 4 /* OSPF Link State Update Message. */
#define OSPF_MSG_LS_ACK 5 /* OSPF Link State Acknoledgement Message. */
#define OSPF_SEND_PACKET_DIRECT 1
#define OSPF_SEND_PACKET_INDIRECT 2
#define OSPF_SEND_PACKET_LOOP 3
#define OSPF_HELLO_REPLY_DELAY 1
/* Return values of functions involved in packet verification, see ospf6d. */
#define MSG_OK 0
#define MSG_NG 1
struct ospf_packet
{
struct ospf_packet *next;
/* Pointer to data stream. */
struct stream *s;
/* IP destination address. */
struct in_addr dst;
/* OSPF packet length. */
u_int16_t length;
};
/* OSPF packet queue structure. */
struct ospf_fifo
{
unsigned long count;
struct ospf_packet *head;
struct ospf_packet *tail;
};
/* OSPF packet header structure. */
struct ospf_header
{
u_char version; /* OSPF Version. */
u_char type; /* Packet Type. */
u_int16_t length; /* Packet Length. */
struct in_addr router_id; /* Router ID. */
struct in_addr area_id; /* Area ID. */
u_int16_t checksum; /* Check Sum. */
u_int16_t auth_type; /* Authentication Type. */
/* Authentication Data. */
union
{
/* Simple Authentication. */
u_char auth_data [OSPF_AUTH_SIMPLE_SIZE];
/* Cryptographic Authentication. */
struct
{
u_int16_t zero; /* Should be 0. */
u_char key_id; /* Key ID. */
u_char auth_data_len; /* Auth Data Length. */
u_int32_t crypt_seqnum; /* Cryptographic Sequence Number. */
} crypt;
} u;
};
/* OSPF Hello body format. */
struct ospf_hello
{
struct in_addr network_mask;
u_int16_t hello_interval;
u_char options;
u_char priority;
u_int32_t dead_interval;
struct in_addr d_router;
struct in_addr bd_router;
struct in_addr neighbors[1];
};
/* OSPF Database Description body format. */
struct ospf_db_desc
{
u_int16_t mtu;
u_char options;
u_char flags;
u_int32_t dd_seqnum;
};
struct ospf_ls_update
{
u_int32_t num_lsas;
};
/* Macros. */
/* XXX Perhaps obsolete; function in ospf_packet.c */
#define OSPF_PACKET_MAX(oi) ospf_packet_max (oi)
#define OSPF_OUTPUT_PNT(S) ((S)->data + (S)->putp)
#define OSPF_OUTPUT_LENGTH(S) ((S)->endp)
#define IS_SET_DD_MS(X) ((X) & OSPF_DD_FLAG_MS)
#define IS_SET_DD_M(X) ((X) & OSPF_DD_FLAG_M)
#define IS_SET_DD_I(X) ((X) & OSPF_DD_FLAG_I)
#define IS_SET_DD_ALL(X) ((X) & OSPF_DD_FLAG_ALL)
/* Prototypes. */
extern void ospf_output_forward (struct stream *, int);
extern struct ospf_packet *ospf_packet_new (size_t);
extern void ospf_packet_free (struct ospf_packet *);
extern struct ospf_fifo *ospf_fifo_new (void);
extern void ospf_fifo_push (struct ospf_fifo *, struct ospf_packet *);
extern struct ospf_packet *ospf_fifo_pop (struct ospf_fifo *);
extern struct ospf_packet *ospf_fifo_head (struct ospf_fifo *);
extern void ospf_fifo_flush (struct ospf_fifo *);
extern void ospf_fifo_free (struct ospf_fifo *);
extern void ospf_packet_add (struct ospf_interface *, struct ospf_packet *);
extern void ospf_packet_delete (struct ospf_interface *);
extern struct stream *ospf_stream_dup (struct stream *);
extern struct ospf_packet *ospf_packet_dup (struct ospf_packet *);
extern int ospf_read (struct thread *);
extern void ospf_hello_send (struct ospf_interface *);
extern void ospf_db_desc_send (struct ospf_neighbor *);
extern void ospf_db_desc_resend (struct ospf_neighbor *);
extern void ospf_ls_req_send (struct ospf_neighbor *);
extern void ospf_ls_upd_send_lsa (struct ospf_neighbor *, struct ospf_lsa *,
int);
extern void ospf_ls_upd_send (struct ospf_neighbor *, struct list *, int);
extern void ospf_ls_ack_send (struct ospf_neighbor *, struct ospf_lsa *);
extern void ospf_ls_ack_send_delayed (struct ospf_interface *);
extern void ospf_ls_retransmit (struct ospf_interface *, struct ospf_lsa *);
extern void ospf_ls_req_event (struct ospf_neighbor *);
extern int ospf_ls_upd_timer (struct thread *);
extern int ospf_ls_ack_timer (struct thread *);
extern int ospf_poll_timer (struct thread *);
extern int ospf_hello_reply_timer (struct thread *);
extern const struct message ospf_packet_type_str[];
extern const size_t ospf_packet_type_str_max;
extern void ospf_proactively_arp (struct ospf_neighbor *);
#endif /* _ZEBRA_OSPF_PACKET_H */
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