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/*
* 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
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public Licenseas 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; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _ZEBRA_ISIS_PDU_H
#define _ZEBRA_ISIS_PDU_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
{
u_char idrp;
u_char length;
u_char version;
u_char id_len;
u_char pdu_type;
u_int16_t holdtime;
u_int16_t checksum;
} __attribute__ ((packed));
#define ESIS_FIXED_HDR_LEN 9
#define ESH_PDU 2
#define ISH_PDU 4
#define RD_PDU 5
/*
* IS to IS Fixed Header
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Intradomain Routeing Protocol Discriminator |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Length Indicator |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Version/Protocol ID extension |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | R | R | R | PDU Type |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Version |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Reserved |
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | Maximum Area Addresses |
* +-------+-------+-------+-------+-------+-------+-------+-------+
*/
struct isis_fixed_hdr
{
u_char idrp;
u_char length;
u_char version1;
u_char id_len;
u_char pdu_type;
u_char version2;
u_char reserved;
u_char max_area_addrs;
} __attribute__ ((packed));
#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
{
u_char circuit_t;
u_char source_id[ISIS_SYS_ID_LEN];
u_int16_t hold_time;
u_int16_t pdu_len;
u_char prio;
u_char 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
{
u_char circuit_t;
u_char source_id[ISIS_SYS_ID_LEN];
u_int16_t hold_time;
u_int16_t pdu_len;
u_char local_id;
} __attribute__ ((packed));
#define ISIS_P2PHELLO_HDRLEN 12
#define L1_LINK_STATE 18
#define L2_LINK_STATE 20
/*
* L1 and L2 IS to IS link state PDU header
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + PDU Length + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Remaining Lifetime + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | LSP ID | id_len + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Sequence Number + 4
* +-------+-------+-------+-------+-------+-------+-------+-------+
* + Checksum + 2
* +-------+-------+-------+-------+-------+-------+-------+-------+
* | P | ATT |LSPDBOL| ISTYPE |
* +-------+-------+-------+-------+-------+-------+-------+-------+
*/
struct isis_link_state_hdr
{
u_int16_t pdu_len;
u_int16_t rem_lifetime;
u_char lsp_id[ISIS_SYS_ID_LEN + 2];
u_int32_t seq_num;
u_int16_t checksum;
u_int8_t lsp_bits;
} __attribute__ ((packed));
#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 accomodated 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
{
u_int16_t pdu_len;
u_char source_id[ISIS_SYS_ID_LEN + 1];
u_char start_lsp_id[ISIS_SYS_ID_LEN + 2];
u_char 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
{
u_int16_t pdu_len;
u_char source_id[ISIS_SYS_ID_LEN + 1];
};
#define ISIS_PSNP_HDRLEN 9
#ifdef __SUNPRO_C
#pragma pack()
#endif
/*
* Function for receiving IS-IS PDUs
*/
int isis_receive (struct thread *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
*/
int send_lan_l1_hello (struct thread *thread);
int send_lan_l2_hello (struct thread *thread);
int send_p2p_hello (struct thread *thread);
int send_csnp (struct isis_circuit *circuit, int level);
int send_l1_csnp (struct thread *thread);
int send_l2_csnp (struct thread *thread);
int send_l1_psnp (struct thread *thread);
int send_l2_psnp (struct thread *thread);
int send_lsp (struct thread *thread);
int ack_lsp (struct isis_link_state_hdr *hdr,
struct isis_circuit *circuit, int level);
void fill_fixed_hdr (struct isis_fixed_hdr *hdr, u_char pdu_type);
int send_hello (struct isis_circuit *circuit, int level);
#endif /* _ZEBRA_ISIS_PDU_H */
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