summaryrefslogtreecommitdiffstats
path: root/ospfd/ospf_ext.h
diff options
context:
space:
mode:
Diffstat (limited to 'ospfd/ospf_ext.h')
-rw-r--r--ospfd/ospf_ext.h196
1 files changed, 196 insertions, 0 deletions
diff --git a/ospfd/ospf_ext.h b/ospfd/ospf_ext.h
new file mode 100644
index 000000000..5e1855420
--- /dev/null
+++ b/ospfd/ospf_ext.h
@@ -0,0 +1,196 @@
+/*
+ * This is an implementation of RFC7684 OSPFv2 Prefix/Link Attribute
+ * Advertisement
+ *
+ * Module name: Extended Prefix/Link Opaque LSA header definition
+ *
+ * Author: Anselme Sawadogo <anselmesawadogo@gmail.com>
+ * Author: Olivier Dugeon <olivier.dugeon@orange.com>
+ *
+ * Copyright (C) 2016 - 2017 Orange Labs http://www.orange.com
+ *
+ * This file is part of FRR.
+ *
+ * FRR is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * FRR 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 FRR; see the file COPYING. If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef _FRR_OSPF_EXT_PREF_H_
+#define _FRR_OSPF_EXT_PREF_H_
+
+/*
+ * Opaque LSA's link state ID for Extended Prefix/Link is
+ * structured as follows.
+ *
+ * 24 16 8 0
+ * +--------+--------+--------+--------+
+ * | 7/8 |........|........|........|
+ * +--------+--------+--------+--------+
+ * |<-Type->|<------- Instance ------->|
+ *
+ *
+ * Type: IANA has assigned '7' for Extended Prefix Opaque LSA
+ * and '8' for Extended Link Opaque LSA
+ * Instance: User may select arbitrary 24-bit values to identify
+ * different instances of Extended Prefix/Link Opaque LSA
+ *
+ */
+
+/*
+ * 24 16 8 0
+ * +--------+--------+--------+--------+ ---
+ * | LS age |Options | 10,11 | A
+ * +--------+--------+--------+--------+ | Standard (Opaque) LSA header;
+ * | 7/8 | Instance | |
+ * +--------+--------+--------+--------+ | Type 10 or 11 are used for Extended
+ * | Advertising router | | Prefix Opaque LSA
+ * +--------+--------+--------+--------+ |
+ * | LS sequence number | | Type 10 only is used for Extended
+ * +--------+--------+--------+--------+ | Link Opaque LSA
+ * | LS checksum | Length | V
+ * +--------+--------+--------+--------+ ---
+ * | Type | Length | A
+ * +--------+--------+--------+--------+ | TLV part for Extended Prefix/Link
+ * | | | Opaque LSA;
+ * ~ Values ... ~ | Values might be structured as a set
+ * | | V of sub-TLVs.
+ * +--------+--------+--------+--------+ ---
+ */
+
+/* Global use constant numbers */
+
+#define MAX_LEGAL_EXT_INSTANCE_NUM (0xffff)
+#define LEGAL_EXT_INSTANCE_RANGE(i) (0 <= (i) && (i) <= 0xffff)
+
+/* Flags to manage Extended Link/Prefix Opaque LSA */
+#define EXT_LPFLG_LSA_INACTIVE 0x00
+#define EXT_LPFLG_LSA_ACTIVE 0x01
+#define EXT_LPFLG_LSA_ENGAGED 0x02
+#define EXT_LPFLG_LSA_LOOKUP_DONE 0x04
+#define EXT_LPFLG_LSA_FORCED_REFRESH 0x08
+#define EXT_LPFLG_FIB_ENTRY_SET 0x10
+
+/*
+ * Following section defines TLV (tag, length, value) structures,
+ * used in Extended Prefix/Link Opaque LSA.
+ */
+
+/* Extended Prefix TLV Route Types */
+#define EXT_TLV_PREF_ROUTE_UNSPEC 0
+#define EXT_TLV_PREF_ROUTE_INTRA_AREA 1
+#define EXT_TLV_PREF_ROUTE_INTER_AREA 3
+#define EXT_TLV_PREF_ROUTE_AS_EXT 5
+#define EXT_TLV_PREF_ROUTE_NSSA_EXT 7
+
+/* Extended Prefix and Extended Prefix Range TLVs'
+ * Address family flag for IPv4 */
+#define EXT_TLV_PREF_AF_IPV4 0
+
+/* Extended Prefix TLV Flags */
+#define EXT_TLV_PREF_AFLG 0x80
+#define EXT_TLV_PREF_NFLG 0x40
+
+/* Extended Prefix Range TLV Flags */
+#define EXT_TLV_PREF_RANGE_IAFLG 0x80
+
+/* ERO subtlvs Flags */
+#define EXT_SUBTLV_ERO_LFLG 0x80
+
+/* Extended Prefix TLV see RFC 7684 section 2.1 */
+#define EXT_TLV_PREFIX 1
+#define EXT_TLV_PREFIX_SIZE 8
+struct ext_tlv_prefix {
+ struct tlv_header header;
+ u_int8_t route_type;
+ u_int8_t pref_length;
+ u_int8_t af;
+ u_int8_t flags;
+ struct in_addr address;
+};
+
+/* Extended Link TLV see RFC 7684 section 3.1 */
+#define EXT_TLV_LINK 1
+#define EXT_TLV_LINK_SIZE 12
+struct ext_tlv_link {
+ struct tlv_header header;
+ u_int8_t link_type;
+ u_int8_t reserved[3];
+ struct in_addr link_id;
+ struct in_addr link_data;
+};
+
+/* Remote Interface Address Sub-TLV, Cisco experimental use Sub-TLV */
+#define EXT_SUBTLV_RMT_ITF_ADDR 32768
+#define EXT_SUBTLV_RMT_ITF_ADDR_SIZE 4
+struct ext_subtlv_rmt_itf_addr {
+ struct tlv_header header;
+ struct in_addr value;
+};
+
+/* Internal structure to manage Extended Link/Prefix Opaque LSA */
+struct ospf_ext_lp {
+ bool enabled;
+
+ /* Flags to manage this Extended Prefix/Link Opaque LSA */
+ u_int32_t flags;
+
+ /* Scope is area Opaque Type 10 or AS Opaque LSA Type 11 for
+ * Extended Prefix and area Opaque Type 10 for Extended Link */
+ u_int8_t scope;
+
+ /* area pointer if flooding is Type 10 Null if flooding is AS scope */
+ struct ospf_area *area;
+ struct in_addr area_id;
+
+ /* List of interface with Segment Routing enable */
+ struct list *iflist;
+};
+
+/* Structure to aggregate interfaces information for Extended Prefix/Link */
+struct ext_itf {
+ /* 24-bit Opaque-ID field value according to RFC 7684 specification */
+ u_int32_t instance;
+ u_int8_t type; /* Extended Prefix (7) or Link (8) */
+
+ /* Reference pointer to a Zebra-interface. */
+ struct interface *ifp;
+
+ /* Area info in which this SR link belongs to. */
+ struct ospf_area *area;
+
+ /* Flags to manage this link parameters. */
+ u_int32_t flags;
+
+ /* SID type: Node, Adjacency or LAN Adjacency */
+ enum sid_type stype;
+
+ /* extended link/prefix TLV information */
+ struct ext_tlv_prefix prefix;
+ struct ext_subtlv_prefix_sid node_sid;
+ struct ext_tlv_link link;
+ struct ext_subtlv_adj_sid adj_sid[2];
+ struct ext_subtlv_lan_adj_sid lan_sid[2];
+
+ /* cisco experimental subtlv */
+ struct ext_subtlv_rmt_itf_addr rmt_itf_addr;
+};
+
+/* Prototypes. */
+extern int ospf_ext_init(void);
+extern void ospf_ext_term(void);
+extern void ospf_ext_update_sr(bool);
+extern int ospf_ext_schedule_prefix_index(struct interface *, u_int32_t,
+ struct prefix_ipv4 *);
+#endif /* _FRR_OSPF_EXT_PREF_H_ */