/* * 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 */