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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IS-IS Rout(e)ing protocol - isis_pdu.h
* PDU processing
*
* Copyright (C) 2001,2002 Sampo Saaristo
* Tampere University of Technology
* Institute of Communications Engineering
*/
#ifndef _ZEBRA_ISIS_PDU_H
#define _ZEBRA_ISIS_PDU_H
#include "isisd/isis_tx_queue.h"
#ifdef __SUNPRO_C
#pragma pack(1)
#endif
/*
* ISO 9542 - 7.5,7.6
*
* ES to IS Fixed Header
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Intradomain Routeing Protocol Discriminator |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Length Indicator |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Version/Protocol ID extension |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Reserved = 0 |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | 0 | 0 | 0 | PDU Type |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Holding Time | 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Checksum | 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
*/
struct esis_fixed_hdr {
uint8_t idrp;
uint8_t length;
uint8_t version;
uint8_t id_len;
uint8_t pdu_type;
uint16_t holdtime;
uint16_t checksum;
} __attribute__((packed));
#define ESIS_FIXED_HDR_LEN 9
#define ESH_PDU 2
#define ISH_PDU 4
#define RD_PDU 5
#define ISIS_FIXED_HDR_LEN 8
/*
* IS-IS PDU types.
*/
#define L1_LAN_HELLO 15
#define L2_LAN_HELLO 16
/*
* L1 and L2 LAN IS to IS Hello PDU header
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Reserved | Circuit Type | 1
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Source ID + id_len
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Holding Time | 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | PDU Length | 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | R | Priority | 1
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | LAN ID | id_len + 1
* +-------+-------+-------+-------+-------+-------+-------+-------+
*/
struct isis_lan_hello_hdr {
uint8_t circuit_t;
uint8_t source_id[ISIS_SYS_ID_LEN];
uint16_t hold_time;
uint16_t pdu_len;
uint8_t prio;
uint8_t lan_id[ISIS_SYS_ID_LEN + 1];
} __attribute__((packed));
#define ISIS_LANHELLO_HDRLEN 19
#define P2P_HELLO 17
/*
* Point-to-point IS to IS hello PDU header
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Reserved | Circuit Type | 1
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Source ID + id_len
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Holding Time + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + PDU Length + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Local Circuit ID | 1
* +-------+-------+-------+-------+-------+-------+-------+-------+
*/
struct isis_p2p_hello_hdr {
uint8_t circuit_t;
uint8_t source_id[ISIS_SYS_ID_LEN];
uint16_t hold_time;
uint16_t pdu_len;
uint8_t local_id;
} __attribute__((packed));
#define ISIS_P2PHELLO_HDRLEN 12
#define L1_LINK_STATE 18
#define L2_LINK_STATE 20
#define FS_LINK_STATE 10
#define L2_CIRCUIT_FLOODING_SCOPE 2
struct isis_lsp_hdr {
uint16_t pdu_len;
uint16_t rem_lifetime;
uint8_t lsp_id[ISIS_SYS_ID_LEN + 2];
uint32_t seqno;
uint16_t checksum;
uint8_t lsp_bits;
};
#define ISIS_LSP_HDR_LEN 19
/*
* Since the length field of LSP Entries TLV is one byte long, and each LSP
* entry is LSP_ENTRIES_LEN (16) bytes long, the maximum number of LSP entries
* can be accommodated in a TLV is
* 255 / 16 = 15.
*
* Therefore, the maximum length of the LSP Entries TLV is
* 16 * 15 + 2 (header) = 242 bytes.
*/
#define MAX_LSP_ENTRIES_TLV_SIZE 242
#define L1_COMPLETE_SEQ_NUM 24
#define L2_COMPLETE_SEQ_NUM 25
/*
* L1 and L2 IS to IS complete sequence numbers PDU header
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + PDU Length + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Source ID + id_len + 1
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Start LSP ID + id_len + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + End LSP ID + id_len + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
*/
struct isis_complete_seqnum_hdr {
uint16_t pdu_len;
uint8_t source_id[ISIS_SYS_ID_LEN + 1];
uint8_t start_lsp_id[ISIS_SYS_ID_LEN + 2];
uint8_t stop_lsp_id[ISIS_SYS_ID_LEN + 2];
};
#define ISIS_CSNP_HDRLEN 25
#define L1_PARTIAL_SEQ_NUM 26
#define L2_PARTIAL_SEQ_NUM 27
/*
* L1 and L2 IS to IS partial sequence numbers PDU header
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + PDU Length + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Source ID + id_len + 1
* +---------------------------------------------------------------+
*/
struct isis_partial_seqnum_hdr {
uint16_t pdu_len;
uint8_t source_id[ISIS_SYS_ID_LEN + 1];
};
#define ISIS_PSNP_HDRLEN 9
#ifdef __SUNPRO_C
#pragma pack()
#endif
/*
* Function for receiving IS-IS PDUs
*/
void isis_receive(struct event *thread);
/*
* calling arguments for snp_process ()
*/
#define ISIS_SNP_PSNP_FLAG 0
#define ISIS_SNP_CSNP_FLAG 1
#define ISIS_AUTH_MD5_SIZE 16U
/*
* Sending functions
*/
void send_hello_sched(struct isis_circuit *circuit, int level, long delay);
int send_csnp(struct isis_circuit *circuit, int level);
void send_l1_csnp(struct event *thread);
void send_l2_csnp(struct event *thread);
void send_l1_psnp(struct event *thread);
void send_l2_psnp(struct event *thread);
void send_lsp(struct isis_circuit *circuit,
struct isis_lsp *lsp, enum isis_tx_type tx_type);
void fill_fixed_hdr(uint8_t pdu_type, struct stream *stream);
int send_hello(struct isis_circuit *circuit, int level);
int isis_handle_pdu(struct isis_circuit *circuit, uint8_t *ssnpa);
void isis_log_pdu_drops(struct isis_area *area, const char *pdu_type);
#endif /* _ZEBRA_ISIS_PDU_H */
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