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275 lines
10 KiB
C
275 lines
10 KiB
C
/*
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* IS-IS Rout(e)ing protocol - isis_pdu.h
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* PDU processing
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*
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* Copyright (C) 2001,2002 Sampo Saaristo
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* Tampere University of Technology
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* Institute of Communications Engineering
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public Licenseas published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _ZEBRA_ISIS_PDU_H
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#define _ZEBRA_ISIS_PDU_H
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#ifdef __SUNPRO_C
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#pragma pack(1)
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#endif
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/*
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* ISO 9542 - 7.5,7.6
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*
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* ES to IS Fixed Header
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Intradomain Routeing Protocol Discriminator |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Length Indicator |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Version/Protocol ID extension |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Reserved = 0 |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | 0 | 0 | 0 | PDU Type |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Holding Time | 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Checksum | 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*/
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struct esis_fixed_hdr
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{
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u_char idrp;
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u_char length;
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u_char version;
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u_char id_len;
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u_char pdu_type;
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u_int16_t holdtime;
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u_int16_t checksum;
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} __attribute__ ((packed));
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#define ESIS_FIXED_HDR_LEN 9
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#define ESH_PDU 2
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#define ISH_PDU 4
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#define RD_PDU 5
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/*
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* IS to IS Fixed Header
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Intradomain Routeing Protocol Discriminator |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Length Indicator |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Version/Protocol ID extension |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | R | R | R | PDU Type |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Version |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Reserved |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Maximum Area Addresses |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*/
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struct isis_fixed_hdr
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{
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u_char idrp;
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u_char length;
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u_char version1;
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u_char id_len;
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u_char pdu_type;
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u_char version2;
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u_char reserved;
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u_char max_area_addrs;
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} __attribute__ ((packed));
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#define ISIS_FIXED_HDR_LEN 8
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/*
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* IS-IS PDU types.
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*/
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#define L1_LAN_HELLO 15
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#define L2_LAN_HELLO 16
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/*
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* L1 and L2 LAN IS to IS Hello PDU header
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Reserved | Circuit Type | 1
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + Source ID + id_len
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Holding Time | 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | PDU Length | 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | R | Priority | 1
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | LAN ID | id_len + 1
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*/
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struct isis_lan_hello_hdr
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{
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u_char circuit_t;
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u_char source_id[ISIS_SYS_ID_LEN];
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u_int16_t hold_time;
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u_int16_t pdu_len;
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u_char prio;
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u_char lan_id[ISIS_SYS_ID_LEN + 1];
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} __attribute__ ((packed));
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#define ISIS_LANHELLO_HDRLEN 19
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#define P2P_HELLO 17
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/*
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* Point-to-point IS to IS hello PDU header
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Reserved | Circuit Type | 1
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + Source ID + id_len
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + Holding Time + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + PDU Length + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | Local Circuit ID | 1
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*/
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struct isis_p2p_hello_hdr
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{
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u_char circuit_t;
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u_char source_id[ISIS_SYS_ID_LEN];
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u_int16_t hold_time;
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u_int16_t pdu_len;
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u_char local_id;
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} __attribute__ ((packed));
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#define ISIS_P2PHELLO_HDRLEN 12
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#define L1_LINK_STATE 18
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#define L2_LINK_STATE 20
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/*
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* L1 and L2 IS to IS link state PDU header
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + PDU Length + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + Remaining Lifetime + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | LSP ID | id_len + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + Sequence Number + 4
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + Checksum + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* | P | ATT |LSPDBOL| ISTYPE |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*/
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struct isis_link_state_hdr
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{
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u_int16_t pdu_len;
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u_int16_t rem_lifetime;
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u_char lsp_id[ISIS_SYS_ID_LEN + 2];
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u_int32_t seq_num;
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u_int16_t checksum;
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u_int8_t lsp_bits;
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} __attribute__ ((packed));
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#define ISIS_LSP_HDR_LEN 19
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/*
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* Since the length field of LSP Entries TLV is one byte long, and each LSP
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* entry is LSP_ENTRIES_LEN (16) bytes long, the maximum number of LSP entries
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* can be accomodated in a TLV is
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* 255 / 16 = 15.
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*
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* Therefore, the maximum length of the LSP Entries TLV is
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* 16 * 15 + 2 (header) = 242 bytes.
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*/
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#define MAX_LSP_ENTRIES_TLV_SIZE 242
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#define L1_COMPLETE_SEQ_NUM 24
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#define L2_COMPLETE_SEQ_NUM 25
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/*
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* L1 and L2 IS to IS complete sequence numbers PDU header
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + PDU Length + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + Source ID + id_len + 1
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + Start LSP ID + id_len + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + End LSP ID + id_len + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*/
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struct isis_complete_seqnum_hdr
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{
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u_int16_t pdu_len;
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u_char source_id[ISIS_SYS_ID_LEN + 1];
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u_char start_lsp_id[ISIS_SYS_ID_LEN + 2];
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u_char stop_lsp_id[ISIS_SYS_ID_LEN + 2];
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};
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#define ISIS_CSNP_HDRLEN 25
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#define L1_PARTIAL_SEQ_NUM 26
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#define L2_PARTIAL_SEQ_NUM 27
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/*
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* L1 and L2 IS to IS partial sequence numbers PDU header
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + PDU Length + 2
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* + Source ID + id_len + 1
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* +---------------------------------------------------------------+
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*/
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struct isis_partial_seqnum_hdr
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{
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u_int16_t pdu_len;
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u_char source_id[ISIS_SYS_ID_LEN + 1];
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};
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#define ISIS_PSNP_HDRLEN 9
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#ifdef __SUNPRO_C
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#pragma pack()
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#endif
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/*
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* Function for receiving IS-IS PDUs
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*/
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int isis_receive (struct thread *thread);
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/*
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* calling arguments for snp_process ()
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*/
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#define ISIS_SNP_PSNP_FLAG 0
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#define ISIS_SNP_CSNP_FLAG 1
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#define ISIS_AUTH_MD5_SIZE 16U
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/*
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* Sending functions
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*/
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int send_lan_l1_hello (struct thread *thread);
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int send_lan_l2_hello (struct thread *thread);
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int send_p2p_hello (struct thread *thread);
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int send_csnp (struct isis_circuit *circuit, int level);
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int send_l1_csnp (struct thread *thread);
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int send_l2_csnp (struct thread *thread);
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int send_l1_psnp (struct thread *thread);
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int send_l2_psnp (struct thread *thread);
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int send_lsp (struct thread *thread);
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int ack_lsp (struct isis_link_state_hdr *hdr,
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struct isis_circuit *circuit, int level);
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void fill_fixed_hdr (struct isis_fixed_hdr *hdr, u_char pdu_type);
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int send_hello (struct isis_circuit *circuit, int level);
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#endif /* _ZEBRA_ISIS_PDU_H */
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