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Diffstat (limited to 'isisd/isis_pdu.h')
| -rw-r--r-- | isisd/isis_pdu.h | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/isisd/isis_pdu.h b/isisd/isis_pdu.h new file mode 100644 index 0000000..5303c61 --- /dev/null +++ b/isisd/isis_pdu.h @@ -0,0 +1,211 @@ +// 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 */ |