| /* |
| * 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 */ |