154 lines
4.7 KiB
C
154 lines
4.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OSPF Sending and Receiving OSPF Packets.
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* Copyright (C) 1999 Toshiaki Takada
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*/
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#ifndef _ZEBRA_OSPF_PACKET_H
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#define _ZEBRA_OSPF_PACKET_H
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#define OSPF_HEADER_SIZE 24U
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#define OSPF_AUTH_SIMPLE_SIZE 8U
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#define OSPF_AUTH_MD5_SIZE 16U
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#define OSPF_MAX_PACKET_SIZE 65535U /* includes IP Header size. */
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#define OSPF_HELLO_MIN_SIZE 20U /* not including neighbors */
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#define OSPF_DB_DESC_MIN_SIZE 8U
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#define OSPF_LS_REQ_MIN_SIZE 0U
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#define OSPF_LS_UPD_MIN_SIZE 4U
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#define OSPF_LS_ACK_MIN_SIZE 0U
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#define OSPF_MSG_HELLO 1 /* OSPF Hello Message. */
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#define OSPF_MSG_DB_DESC 2 /* OSPF Database Description Message. */
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#define OSPF_MSG_LS_REQ 3 /* OSPF Link State Request Message. */
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#define OSPF_MSG_LS_UPD 4 /* OSPF Link State Update Message. */
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#define OSPF_MSG_LS_ACK 5 /* OSPF Link State Acknowledgement Message. */
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#define OSPF_SEND_PACKET_DIRECT 1
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#define OSPF_SEND_PACKET_INDIRECT 2
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#define OSPF_SEND_PACKET_LOOP 3
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#define OSPF_HELLO_REPLY_DELAY 1
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/* Return values of functions involved in packet verification, see ospf6d. */
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#define MSG_OK 0
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#define MSG_NG 1
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struct ospf_packet {
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struct ospf_packet *next;
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/* Pointer to data stream. */
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struct stream *s;
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/* IP destination address. */
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struct in_addr dst;
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/* OSPF packet length. */
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uint16_t length;
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};
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/* OSPF packet queue structure. */
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struct ospf_fifo {
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unsigned long count;
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struct ospf_packet *head;
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struct ospf_packet *tail;
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};
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/* OSPF packet header structure. */
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struct ospf_header {
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uint8_t version; /* OSPF Version. */
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uint8_t type; /* Packet Type. */
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uint16_t length; /* Packet Length. */
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struct in_addr router_id; /* Router ID. */
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struct in_addr area_id; /* Area ID. */
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uint16_t checksum; /* Check Sum. */
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uint16_t auth_type; /* Authentication Type. */
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/* Authentication Data. */
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union {
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/* Simple Authentication. */
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uint8_t auth_data[OSPF_AUTH_SIMPLE_SIZE];
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/* Cryptographic Authentication. */
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struct {
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uint16_t zero; /* Should be 0. */
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uint8_t key_id; /* Key ID. */
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uint8_t auth_data_len; /* Auth Data Length. */
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uint32_t crypt_seqnum; /* Cryptographic Sequence
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Number. */
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} crypt;
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} u;
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};
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/* OSPF Hello body format. */
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struct ospf_hello {
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struct in_addr network_mask;
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uint16_t hello_interval;
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uint8_t options;
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uint8_t priority;
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uint32_t dead_interval;
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struct in_addr d_router;
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struct in_addr bd_router;
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struct in_addr neighbors[1];
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};
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/* OSPF Database Description body format. */
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struct ospf_db_desc {
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uint16_t mtu;
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uint8_t options;
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uint8_t flags;
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uint32_t dd_seqnum;
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};
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struct ospf_ls_update {
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uint32_t num_lsas;
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};
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/* Macros. */
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/* XXX Perhaps obsolete; function in ospf_packet.c */
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#define OSPF_PACKET_MAX(oi) ospf_packet_max (oi)
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#define OSPF_OUTPUT_PNT(S) ((S)->data + (S)->putp)
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#define OSPF_OUTPUT_LENGTH(S) ((S)->endp)
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#define IS_SET_DD_MS(X) ((X) & OSPF_DD_FLAG_MS)
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#define IS_SET_DD_M(X) ((X) & OSPF_DD_FLAG_M)
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#define IS_SET_DD_I(X) ((X) & OSPF_DD_FLAG_I)
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#define IS_SET_DD_ALL(X) ((X) & OSPF_DD_FLAG_ALL)
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/* Prototypes. */
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extern void ospf_packet_free(struct ospf_packet *);
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extern struct ospf_fifo *ospf_fifo_new(void);
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extern void ospf_fifo_push(struct ospf_fifo *, struct ospf_packet *);
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extern struct ospf_packet *ospf_fifo_pop(struct ospf_fifo *);
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extern struct ospf_packet *ospf_fifo_head(struct ospf_fifo *);
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extern void ospf_fifo_flush(struct ospf_fifo *);
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extern void ospf_fifo_free(struct ospf_fifo *);
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extern void ospf_read(struct event *thread);
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extern void ospf_hello_send(struct ospf_interface *);
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extern void ospf_db_desc_send(struct ospf_neighbor *);
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extern void ospf_db_desc_resend(struct ospf_neighbor *);
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extern void ospf_ls_req_send(struct ospf_neighbor *);
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extern void ospf_ls_upd_send_lsa(struct ospf_neighbor *, struct ospf_lsa *,
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int);
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extern void ospf_ls_upd_send(struct ospf_neighbor *, struct list *, int, int);
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extern void ospf_ls_upd_queue_send(struct ospf_interface *oi,
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struct list *update, struct in_addr addr,
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int send_lsupd_now);
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extern void ospf_ls_ack_send(struct ospf_neighbor *, struct ospf_lsa *);
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extern void ospf_ls_ack_send_delayed(struct ospf_interface *);
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extern void ospf_ls_retransmit(struct ospf_interface *, struct ospf_lsa *);
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extern void ospf_ls_req_event(struct ospf_neighbor *);
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extern void ospf_ls_upd_timer(struct event *thread);
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extern void ospf_ls_ack_timer(struct event *thread);
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extern void ospf_poll_timer(struct event *thread);
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extern void ospf_hello_reply_timer(struct event *thread);
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extern const struct message ospf_packet_type_str[];
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extern const size_t ospf_packet_type_str_max;
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extern void ospf_proactively_arp(struct ospf_neighbor *);
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#endif /* _ZEBRA_OSPF_PACKET_H */
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