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Common behavior for LSupd and delayed LSack moved to ospf_send_to_iface() and other minor changes.
1122 lines
33 KiB
C
1122 lines
33 KiB
C
/*
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* BIRD -- OSPF
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*
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* (c) 1999--2005 Ondrej Filip <feela@network.cz>
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* (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
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* (c) 2009--2014 CZ.NIC z.s.p.o.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_OSPF_H_
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#define _BIRD_OSPF_H_
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#include "nest/bird.h"
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#include "lib/checksum.h"
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#include "lib/idm.h"
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#include "lib/lists.h"
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#include "lib/slists.h"
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#include "lib/socket.h"
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#include "lib/timer.h"
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#include "lib/resource.h"
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#include "nest/protocol.h"
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#include "nest/iface.h"
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#include "nest/route.h"
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#include "nest/cli.h"
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#include "nest/locks.h"
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#include "nest/bfd.h"
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#include "conf/conf.h"
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#include "lib/string.h"
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#ifdef LOCAL_DEBUG
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#define OSPF_FORCE_DEBUG 1
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#else
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#define OSPF_FORCE_DEBUG 0
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#endif
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#define OSPF_TRACE(flags, msg, args...) \
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do { if ((p->p.debug & flags) || OSPF_FORCE_DEBUG) \
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log(L_TRACE "%s: " msg, p->p.name , ## args ); } while(0)
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#define OSPF_PACKET(dumpfn, buffer, msg, args...) \
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do { if ((p->p.debug & D_PACKETS) || OSPF_FORCE_DEBUG) \
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{ log(L_TRACE "%s: " msg, p->p.name, ## args ); dumpfn(p, buffer); } } while(0)
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#define LOG_PKT(msg, args...) \
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log_rl(&p->log_pkt_tbf, L_REMOTE "%s: " msg, p->p.name, args)
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#define LOG_PKT_AUTH(msg, args...) \
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log_rl(&p->log_pkt_tbf, L_AUTH "%s: " msg, p->p.name, args)
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#define LOG_PKT_WARN(msg, args...) \
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log_rl(&p->log_pkt_tbf, L_WARN "%s: " msg, p->p.name, args)
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#define LOG_LSA1(msg, args...) \
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log_rl(&p->log_lsa_tbf, L_REMOTE "%s: " msg, p->p.name, args)
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#define LOG_LSA2(msg, args...) \
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do { if (! p->log_lsa_tbf.drop) \
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log(L_REMOTE "%s: " msg, p->p.name, args); } while(0)
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#define OSPF_PROTO 89
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#define LSREFRESHTIME 1800 /* 30 minutes */
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#define MINLSINTERVAL (5 S_)
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#define MINLSARRIVAL (1 S_)
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#define LSINFINITY 0xffffff
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#define OSPF_PKT_TYPES 5 /* HELLO_P .. LSACK_P */
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#define OSPF3_CRYPTO_ID 1 /* OSPFv3 Cryptographic Protocol ID */
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#define OSPF_DEFAULT_TICK 1
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#define OSPF_DEFAULT_STUB_COST 1000
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#define OSPF_DEFAULT_ECMP_LIMIT 16
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#define OSPF_DEFAULT_GR_TIME 120
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#define OSPF_DEFAULT_TRANSINT 40
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#define OSPF_MIN_PKT_SIZE 256
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#define OSPF_MAX_PKT_SIZE 65535
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#define OSPF_VLINK_ID_OFFSET 0x80000000
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#define OSPF_GR_ABLE 1
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#define OSPF_GR_AWARE 2
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struct ospf_config
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{
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struct proto_config c;
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uint tick;
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u8 ospf2;
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u8 af_ext;
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u8 af_mc;
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u8 rfc1583;
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u8 stub_router;
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u8 merge_external;
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u8 instance_id;
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u8 instance_id_set;
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u8 abr;
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u8 asbr;
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u8 vpn_pe;
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u8 gr_mode; /* Graceful restart mode (OSPF_GR_*) */
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uint gr_time; /* Graceful restart interval */
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uint ecmp;
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list area_list; /* list of area configs (struct ospf_area_config) */
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list vlink_list; /* list of configured vlinks (struct ospf_iface_patt) */
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};
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struct ospf_area_config
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{
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node n;
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u32 areaid;
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u32 default_cost; /* Cost of default route for stub areas
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(With possible LSA_EXT3_EBIT for NSSA areas) */
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u8 type; /* Area type (standard, stub, NSSA), represented
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by option flags (OPT_E, OPT_N) */
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u8 summary; /* Import summaries to this stub/NSSA area, valid for ABR */
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u8 default_nssa; /* Generate default NSSA route for NSSA+summary area */
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u8 translator; /* Translator role, for NSSA ABR */
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u32 transint; /* Translator stability interval */
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list patt_list; /* List of iface configs (struct ospf_iface_patt) */
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list net_list; /* List of aggregate networks for that area */
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list enet_list; /* List of aggregate external (NSSA) networks */
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list stubnet_list; /* List of stub networks added to Router LSA */
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};
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struct area_net_config
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{
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node n;
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net_addr prefix;
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u32 tag;
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u8 hidden;
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};
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struct area_net
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{
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u32 metric; /* With possible LSA_EXT3_EBIT for NSSA area nets */
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u32 tag;
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u8 hidden;
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u8 active;
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struct fib_node fn;
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};
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struct ospf_stubnet_config
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{
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node n;
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net_addr prefix;
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u32 cost;
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u8 hidden;
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u8 summary;
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};
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struct nbma_node
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{
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node n;
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ip_addr ip;
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byte eligible;
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byte found;
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};
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struct ospf_iface_patt
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{
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struct iface_patt i;
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u32 type;
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u32 stub;
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u32 cost;
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u32 helloint;
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u32 rxmtint;
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u32 pollint;
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u32 waitint;
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u32 deadc;
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u32 deadint;
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u32 inftransdelay;
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list nbma_list;
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u32 priority;
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u32 voa;
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u32 vid;
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int tx_tos;
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int tx_priority;
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u16 tx_length;
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u16 rx_buffer;
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#define OSPF_RXBUF_MINSIZE 256 /* Minimal allowed size */
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u8 instance_id;
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u8 instance_id_set;
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u8 autype; /* OSPF_AUTH_*, not really used in OSPFv3 */
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u8 strictnbma;
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u8 check_link;
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u8 ecmp_weight;
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u8 link_lsa_suppression;
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u8 real_bcast; /* Not really used in OSPFv3 */
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u8 ptp_netmask; /* bool + 2 for unspecified */
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u8 ptp_address; /* bool + 2 for unspecified */
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u8 ttl_security; /* bool + 2 for TX only */
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u8 bfd;
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list *passwords;
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};
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/* Default values for interface parameters */
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#define COST_D 10
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#define RXMTINT_D 5
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#define INFTRANSDELAY_D 1
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#define PRIORITY_D 1
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#define HELLOINT_D 10
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#define POLLINT_D 20
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#define DEADC_D 4
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#define WAIT_DMH 4
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/* Value of Wait timer - not found it in RFC * - using 4*HELLO */
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struct ospf_proto
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{
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struct proto p;
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timer *disp_timer; /* OSPF proto dispatcher */
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uint tick;
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struct top_graph *gr; /* LSA graph */
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slist lsal; /* List of all LSA's */
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int calcrt; /* Routing table calculation scheduled?
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0=no, 1=normal, 2=forced reload */
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list iface_list; /* List of OSPF interfaces (struct ospf_iface) */
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list area_list; /* List of OSPF areas (struct ospf_area) */
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int areano; /* Number of area I belong to */
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int padj; /* Number of neighbors in Exchange or Loading state */
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int gr_count; /* Number of neighbors in graceful restart state */
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u8 gr_recovery; /* Graceful restart recovery is active */
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u8 gr_cleanup; /* GR cleanup scheduled */
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btime gr_timeout; /* The end time of grace restart recovery */
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struct fib rtf; /* Routing table */
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struct idm idm; /* OSPFv3 LSA ID map */
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u8 ospf2; /* OSPF v2 or v3 */
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u8 af_ext; /* OSPFv3-AF extension */
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u8 af_mc; /* OSPFv3-AF multicast */
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u8 rfc1583; /* RFC1583 compatibility */
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u8 stub_router; /* Do not forward transit traffic */
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u8 merge_external; /* Should i merge external routes? */
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u8 instance_id; /* Differentiate between more OSPF instances */
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u8 asbr; /* May i originate any ext/NSSA lsa? */
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u8 vpn_pe; /* Should we do VPN PE specific behavior (RFC 4577)? */
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u8 ecmp; /* Maximal number of nexthops in ECMP route, or 0 */
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u8 gr_mode; /* Graceful restart mode (OSPF_GR_*) */
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uint gr_time; /* Graceful restart interval */
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u64 csn64; /* Last used cryptographic sequence number */
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struct ospf_area *backbone; /* If exists */
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event *flood_event; /* Event for flooding LS updates */
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void *lsab; /* LSA buffer used when originating router LSAs */
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int lsab_size, lsab_used;
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linpool *nhpool; /* Linpool used for next hops computed in SPF */
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sock *vlink_sk; /* IP socket used for vlink TX */
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u32 router_id;
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u32 last_vlink_id; /* Interface IDs for vlinks (starts at 0x80000000) */
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struct tbf log_pkt_tbf; /* TBF for packet messages */
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struct tbf log_lsa_tbf; /* TBF for LSA messages */
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};
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struct ospf_area
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{
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node n;
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u32 areaid;
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struct ospf_area_config *ac; /* Related area config */
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struct top_hash_entry *rt; /* My own router LSA */
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struct top_hash_entry *pxr_lsa; /* Originated prefix LSA */
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list cand; /* List of candidates for RT calc. */
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struct fib net_fib; /* Networks to advertise or not */
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struct fib enet_fib; /* External networks for NSSAs */
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u32 options; /* Optional features */
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u8 update_rt_lsa; /* Rt lsa origination scheduled? */
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u8 trcap; /* Transit capability? */
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u8 marked; /* Used in OSPF reconfigure */
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u8 translate; /* Translator state (TRANS_*), for NSSA ABR */
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timer *translator_timer; /* For NSSA translator switch */
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struct ospf_proto *po;
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struct fib rtr; /* Routing tables for routers */
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};
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struct ospf_iface
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{
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node n;
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struct iface *iface; /* Nest's iface (NULL for vlinks) */
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struct ifa *addr; /* IP prefix associated with that OSPF iface */
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struct ospf_area *oa;
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struct ospf_iface_patt *cf;
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char *ifname; /* Interface name (iface->name), new one for vlinks */
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pool *pool;
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sock *sk; /* IP socket */
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list neigh_list; /* List of neighbors (struct ospf_neighbor) */
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u32 cost; /* Cost of iface */
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u32 waitint; /* Number of seconds before changing state from wait */
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u32 rxmtint; /* Number of seconds between LSA retransmissions */
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u32 pollint; /* Poll interval in seconds */
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u32 deadint; /* After deadint seconds without hellos is router dead */
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u32 iface_id; /* Interface ID (iface->index or new value for vlinks) */
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u32 vid; /* ID of peer of virtual link */
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ip_addr vip; /* IP of peer of virtual link */
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struct ospf_iface *vifa; /* OSPF iface which the vlink goes through */
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struct ospf_area *voa; /* OSPF area which the vlink goes through */
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u16 inftransdelay; /* The estimated number of seconds it takes to
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transmit a Link State Update Packet over this
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interface. LSAs contained in the update */
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u16 helloint; /* number of seconds between hello sending */
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list *passwords;
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u32 csn; /* Last used crypt seq number */
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btime csn_use; /* Last time when packet with that CSN was sent */
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ip_addr all_routers; /* Multicast (or broadcast) address for all routers */
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ip_addr des_routers; /* Multicast (or NULL) address for designated routers */
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ip_addr drip; /* Designated router IP */
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ip_addr bdrip; /* Backup DR IP */
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u32 drid; /* DR Router ID */
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u32 bdrid; /* BDR Router ID */
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s16 rt_pos_beg; /* Position of iface in Router-LSA, begin, inclusive */
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s16 rt_pos_end; /* Position of iface in Router-LSA, end, exclusive */
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s16 px_pos_beg; /* Position of iface in Rt Prefix-LSA, begin, inclusive */
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s16 px_pos_end; /* Position of iface in Rt Prefix-LSA, end, exclusive */
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u32 dr_iface_id; /* if drid is valid, this is iface_id of DR (for connecting network) */
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u8 instance_id; /* Used to differentiate between more OSPF
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instances on one interface */
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u8 autype; /* Authentication type (OSPF_AUTH_*) */
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u8 type; /* OSPF view of type (OSPF_IT_*) */
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u8 strictnbma; /* Can I talk with unknown neighbors? */
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u8 stub; /* Inactive interface */
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u8 state; /* Interface state machine (OSPF_IS_*) */
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timer *wait_timer; /* WAIT timer */
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timer *hello_timer; /* HELLOINT timer */
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timer *poll_timer; /* Poll Interval - for NBMA */
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struct top_hash_entry *link_lsa; /* Originated link LSA */
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struct top_hash_entry *net_lsa; /* Originated network LSA */
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struct top_hash_entry *pxn_lsa; /* Originated prefix LSA */
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struct top_hash_entry **flood_queue; /* LSAs queued for LSUPD */
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u8 update_link_lsa;
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u8 update_net_lsa;
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u16 flood_queue_used; /* The current number of LSAs in flood_queue */
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u16 flood_queue_size; /* The maximum number of LSAs in flood_queue */
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int fadj; /* Number of fully adjacent neighbors */
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list nbma_list;
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u8 priority; /* A router priority for DR election */
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u8 ioprob;
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#define OSPF_I_OK 0 /* Everything OK */
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#define OSPF_I_SK 1 /* Socket open failed */
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#define OSPF_I_LL 2 /* Missing link-local address (OSPFv3) */
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u8 sk_dr; /* Socket is a member of designated routers group */
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u8 marked; /* Used in OSPF reconfigure, 2 for force restart */
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u16 rxbuf; /* Buffer size */
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u16 tx_length; /* Soft TX packet length limit, usually MTU */
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u16 tx_hdrlen; /* Expected packet header length, less than tx_length */
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u8 check_link; /* Whether iface link change is used */
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u8 ecmp_weight; /* Weight used for ECMP */
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u8 link_lsa_suppression; /* Suppression of Link-LSA origination */
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u8 ptp_netmask; /* Send real netmask for P2P */
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u8 ptp_address; /* Send IP address in data field for PtP */
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u8 check_ttl; /* Check incoming packets for TTL 255 */
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u8 bfd; /* Use BFD on iface */
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};
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struct ospf_neighbor
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{
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node n;
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pool *pool;
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struct ospf_iface *ifa;
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u8 state;
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u8 gr_active; /* We act as GR helper for the neighbor */
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u8 got_my_rt_lsa; /* Received my Rt-LSA in DBDES exchanged */
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timer *inactim; /* Inactivity timer */
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u8 imms; /* I, M, Master/slave received */
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u8 myimms; /* I, M Master/slave */
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u32 dds; /* DD Sequence number being sent */
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u32 ddr; /* last Dat Des packet received */
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u32 rid; /* Router ID */
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ip_addr ip; /* IP of it's interface */
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u8 priority; /* Priority */
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u32 options; /* Options received */
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/* Entries dr and bdr store IP addresses in OSPFv2 and router IDs in
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OSPFv3, we use the same type to simplify handling */
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u32 dr; /* Neighbor's idea of DR */
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u32 bdr; /* Neighbor's idea of BDR */
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u32 iface_id; /* ID of Neighbour's iface connected to common network */
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/* Database summary list iterator, controls initial dbdes exchange.
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* Advances in the LSA list as dbdes packets are sent.
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*/
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siterator dbsi; /* iterator of po->lsal */
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/* Link state request list, controls initial LSA exchange.
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* Entries added when received in dbdes packets, removed as sent in lsreq packets.
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*/
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slist lsrql; /* slist of struct top_hash_entry from n->lsrqh */
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struct top_graph *lsrqh;
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struct top_hash_entry *lsrqi; /* Pointer to the first unsent node in lsrql */
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/* Link state retransmission list, controls LSA retransmission during flood.
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* Entries added as sent in lsupd packets, removed when received in lsack packets.
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* These entries hold ret_count in appropriate LSA entries.
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*/
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slist lsrtl; /* slist of struct top_hash_entry from n->lsrth */
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struct top_graph *lsrth;
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timer *dbdes_timer; /* DBDES exchange timer */
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timer *lsrq_timer; /* LSA request timer */
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timer *lsrt_timer; /* LSA retransmission timer */
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list ackl[2];
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#define ACKL_DIRECT 0
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#define ACKL_DELAY 1
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timer *ackd_timer; /* Delayed ack timer */
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timer *gr_timer; /* Graceful restart timer, non-NULL only if gr_active */
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struct bfd_request *bfd_req; /* BFD request, if BFD is used */
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void *ldd_buffer; /* Last database description packet */
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u32 ldd_bsize; /* Buffer size for ldd_buffer */
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u32 csn; /* OSPFv2: Last received crypt seq number */
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u64 csn64[OSPF_PKT_TYPES]; /* OSPFv3: Last received CSN for each type of packet */
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};
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/* OSPF interface types */
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#define OSPF_IT_BCAST 0
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#define OSPF_IT_NBMA 1
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#define OSPF_IT_PTP 2
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#define OSPF_IT_PTMP 3
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#define OSPF_IT_VLINK 4
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#define OSPF_IT_UNDEF 5
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/* OSPF interface states */
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#define OSPF_IS_DOWN 0 /* Not active */
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#define OSPF_IS_LOOP 1 /* Iface with no link */
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#define OSPF_IS_WAITING 2 /* Waiting for Wait timer */
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#define OSPF_IS_PTP 3 /* PTP operational */
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#define OSPF_IS_DROTHER 4 /* I'm on BCAST or NBMA and I'm not DR */
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#define OSPF_IS_BACKUP 5 /* I'm BDR */
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#define OSPF_IS_DR 6 /* I'm DR */
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/* Definitions for interface state machine */
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#define ISM_UP 0 /* Interface Up */
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#define ISM_WAITF 1 /* Wait timer fired */
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#define ISM_BACKS 2 /* Backup seen */
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#define ISM_NEICH 3 /* Neighbor change */
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#define ISM_LOOP 4 /* Link down */
|
|
#define ISM_UNLOOP 5 /* Link up */
|
|
#define ISM_DOWN 6 /* Interface down */
|
|
|
|
/* OSPF authentication types */
|
|
#define OSPF_AUTH_NONE 0
|
|
#define OSPF_AUTH_SIMPLE 1
|
|
#define OSPF_AUTH_CRYPT 2
|
|
|
|
#define OSPF3_AUTH_HMAC 1 /* HMAC Cryptographic Authentication */
|
|
|
|
/* OSPF neighbor states */
|
|
#define NEIGHBOR_DOWN 0
|
|
#define NEIGHBOR_ATTEMPT 1
|
|
#define NEIGHBOR_INIT 2
|
|
#define NEIGHBOR_2WAY 3
|
|
#define NEIGHBOR_EXSTART 4
|
|
#define NEIGHBOR_EXCHANGE 5
|
|
#define NEIGHBOR_LOADING 6
|
|
#define NEIGHBOR_FULL 7
|
|
|
|
/* Definitions for neighbor state machine */
|
|
#define INM_HELLOREC 0 /* Hello Received */
|
|
#define INM_START 1 /* Neighbor start - for NBMA */
|
|
#define INM_2WAYREC 2 /* 2-Way received */
|
|
#define INM_NEGDONE 3 /* Negotiation done */
|
|
#define INM_EXDONE 4 /* Exchange done */
|
|
#define INM_BADLSREQ 5 /* Bad LS Request */
|
|
#define INM_LOADDONE 6 /* Load done */
|
|
#define INM_ADJOK 7 /* AdjOK? */
|
|
#define INM_SEQMIS 8 /* Sequence number mismatch */
|
|
#define INM_1WAYREC 9 /* 1-Way */
|
|
#define INM_KILLNBR 10 /* Kill Neighbor */
|
|
#define INM_INACTTIM 11 /* Inactivity timer */
|
|
#define INM_LLDOWN 12 /* Line down */
|
|
|
|
#define TRANS_OFF 0
|
|
#define TRANS_ON 1
|
|
#define TRANS_WAIT 2 /* Waiting before the end of translation */
|
|
|
|
|
|
/* Generic option flags */
|
|
#define OPT_V6 0x0001 /* OSPFv3, LSA relevant for IPv6 routing calculation */
|
|
#define OPT_E 0x0002 /* Related to AS-external LSAs */
|
|
#define OPT_MC 0x0004 /* Related to MOSPF, not used and obsolete */
|
|
#define OPT_N 0x0008 /* Related to NSSA */
|
|
#define OPT_P 0x0008 /* OSPFv2, flags P and N share position, see NSSA RFC */
|
|
#define OPT_L_V2 0x0010 /* OSPFv2, link-local signaling, not used */
|
|
#define OPT_R 0x0010 /* OSPFv3, originator is active router */
|
|
#define OPT_DC 0x0020 /* Related to demand circuits, not used */
|
|
#define OPT_O 0x0040 /* OSPFv2 Opaque LSA (RFC 5250) */
|
|
#define OPT_DN 0x0080 /* OSPFv2 VPN loop prevention (RFC 4576) */
|
|
#define OPT_AF 0x0100 /* OSPFv3 Address Families (RFC 5838) */
|
|
#define OPT_L_V3 0x0200 /* OSPFv3, link-local signaling */
|
|
#define OPT_AT 0x0400 /* OSPFv3, authentication trailer */
|
|
|
|
#define HELLO2_OPT_MASK (OPT_E | OPT_N | OPT_L_V2)
|
|
#define DBDES2_OPT_MASK (OPT_E | OPT_L_V2 | OPT_O)
|
|
|
|
#define HELLO3_OPT_MASK (OPT_V6 | OPT_E | OPT_N | OPT_R | OPT_AF | OPT_L_V3 | OPT_AT )
|
|
#define DBDES3_OPT_MASK (OPT_V6 | OPT_E | OPT_R | OPT_AF | OPT_L_V3 | OPT_AT )
|
|
|
|
/* Router-LSA VEB flags are are stored together with links (OSPFv2) or options (OSPFv3) */
|
|
#define OPT_RT_B (0x01 << 24)
|
|
#define OPT_RT_E (0x02 << 24)
|
|
#define OPT_RT_V (0x04 << 24)
|
|
#define OPT_RT_NT (0x10 << 24)
|
|
|
|
/* Prefix flags, specific for OSPFv3 */
|
|
#define OPT_PX_NU 0x01
|
|
#define OPT_PX_LA 0x02
|
|
#define OPT_PX_P 0x08
|
|
#define OPT_PX_DN 0x10
|
|
|
|
|
|
struct ospf_packet
|
|
{
|
|
u8 version;
|
|
u8 type;
|
|
u16 length;
|
|
u32 routerid;
|
|
u32 areaid;
|
|
u16 checksum;
|
|
u8 instance_id; /* See RFC 6549 */
|
|
u8 autype; /* Undefined for OSPFv3 */
|
|
};
|
|
|
|
struct ospf_lls
|
|
{
|
|
u16 checksum;
|
|
u16 length;
|
|
byte data[0];
|
|
};
|
|
|
|
struct ospf_auth_crypto
|
|
{
|
|
u16 zero;
|
|
u8 keyid;
|
|
u8 len;
|
|
u32 csn; /* Cryptographic sequence number (32-bit) */
|
|
};
|
|
|
|
union ospf_auth2
|
|
{
|
|
u8 password[8];
|
|
struct ospf_auth_crypto c32;
|
|
};
|
|
|
|
struct ospf_auth3
|
|
{
|
|
u16 type; /* Authentication type (OSPF3_AUTH_*) */
|
|
u16 length; /* Authentication trailer length (header + data) */
|
|
u16 reserved;
|
|
u16 sa_id; /* Security association identifier (key_id) */
|
|
u64 csn; /* Cryptographic sequence number (64-bit) */
|
|
byte data[0]; /* Authentication data */
|
|
};
|
|
|
|
|
|
/* Packet types */
|
|
#define HELLO_P 1 /* Hello */
|
|
#define DBDES_P 2 /* Database description */
|
|
#define LSREQ_P 3 /* Link state request */
|
|
#define LSUPD_P 4 /* Link state update */
|
|
#define LSACK_P 5 /* Link state acknowledgement */
|
|
|
|
|
|
#define DBDES_I 4 /* Init bit */
|
|
#define DBDES_M 2 /* More bit */
|
|
#define DBDES_MS 1 /* Master/Slave bit */
|
|
#define DBDES_IMMS (DBDES_I | DBDES_M | DBDES_MS)
|
|
|
|
|
|
/* OSPFv3 LSA Types / LSA Function Codes */
|
|
/* https://www.iana.org/assignments/ospfv3-parameters/ospfv3-parameters.xhtml#ospfv3-parameters-3 */
|
|
#define LSA_T_RT 0x2001
|
|
#define LSA_T_NET 0x2002
|
|
#define LSA_T_SUM_NET 0x2003
|
|
#define LSA_T_SUM_RT 0x2004
|
|
#define LSA_T_EXT 0x4005
|
|
#define LSA_T_NSSA 0x2007
|
|
#define LSA_T_LINK 0x0008
|
|
#define LSA_T_PREFIX 0x2009
|
|
#define LSA_T_GR 0x000B
|
|
#define LSA_T_RI_ 0x000C
|
|
#define LSA_T_RI_LINK 0x800C
|
|
#define LSA_T_RI_AREA 0xA00C
|
|
#define LSA_T_RI_AS 0xC00C
|
|
#define LSA_T_OPAQUE_ 0x1FFF
|
|
#define LSA_T_OPAQUE_LINK 0x9FFF
|
|
#define LSA_T_OPAQUE_AREA 0xBFFF
|
|
#define LSA_T_OPAQUE_AS 0xDFFF
|
|
|
|
#define LSA_T_V2_OPAQUE_ 0x0009
|
|
#define LSA_T_V2_MASK 0x00ff
|
|
|
|
/* OSPFv2 Opaque LSA Types */
|
|
/* https://www.iana.org/assignments/ospf-opaque-types/ospf-opaque-types.xhtml#ospf-opaque-types-2 */
|
|
#define LSA_OT_GR 0x03
|
|
#define LSA_OT_RI 0x04
|
|
|
|
#define LSA_FUNCTION_MASK 0x1FFF
|
|
#define LSA_FUNCTION(type) ((type) & LSA_FUNCTION_MASK)
|
|
|
|
#define LSA_UBIT 0x8000
|
|
|
|
#define LSA_SCOPE_LINK 0x0000
|
|
#define LSA_SCOPE_AREA 0x2000
|
|
#define LSA_SCOPE_AS 0x4000
|
|
#define LSA_SCOPE_RES 0x6000
|
|
#define LSA_SCOPE_MASK 0x6000
|
|
#define LSA_SCOPE(type) ((type) & LSA_SCOPE_MASK)
|
|
#define LSA_SCOPE_ORDER(type) (((type) >> 13) & 0x3)
|
|
|
|
|
|
#define LSA_MAXAGE 3600 /* 1 hour */
|
|
#define LSA_CHECKAGE 300 /* 5 minutes */
|
|
#define LSA_MAXAGEDIFF 900 /* 15 minutes */
|
|
|
|
#define LSA_ZEROSEQNO ((s32) 0x80000000)
|
|
#define LSA_INITSEQNO ((s32) 0x80000001)
|
|
#define LSA_MAXSEQNO ((s32) 0x7fffffff)
|
|
|
|
#define LSA_METRIC_MASK 0x00FFFFFF
|
|
#define LSA_OPTIONS_MASK 0x00FFFFFF
|
|
|
|
|
|
#define LSART_PTP 1
|
|
#define LSART_NET 2
|
|
#define LSART_STUB 3
|
|
#define LSART_VLNK 4
|
|
|
|
#define LSA_RT2_LINKS 0x0000FFFF
|
|
|
|
#define LSA_SUM2_TOS 0xFF000000
|
|
|
|
#define LSA_EXT2_TOS 0x7F000000
|
|
#define LSA_EXT2_EBIT 0x80000000
|
|
|
|
#define LSA_EXT3_EBIT 0x04000000
|
|
#define LSA_EXT3_FBIT 0x02000000
|
|
#define LSA_EXT3_TBIT 0x01000000
|
|
|
|
/* OSPF Grace LSA (GR) TLVs */
|
|
/* https://www.iana.org/assignments/ospfv2-parameters/ospfv2-parameters.xhtml#ospfv2-parameters-13 */
|
|
#define LSA_GR_PERIOD 1
|
|
#define LSA_GR_REASON 2
|
|
#define LSA_GR_ADDRESS 3
|
|
|
|
/* OSPF Router Information (RI) TLVs */
|
|
/* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#ri-tlv */
|
|
#define LSA_RI_RIC 1
|
|
#define LSA_RI_RFC 2
|
|
|
|
/* OSPF Router Informational Capability Bits */
|
|
/* https://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#router-informational-capability */
|
|
#define LSA_RIC_GR_CAPABLE 0
|
|
#define LSA_RIC_GR_HELPER 1
|
|
#define LSA_RIC_STUB_ROUTER 2
|
|
|
|
|
|
struct ospf_lsa_header
|
|
{
|
|
u16 age; /* LS Age */
|
|
u16 type_raw; /* Type, mixed with options on OSPFv2 */
|
|
|
|
u32 id;
|
|
u32 rt; /* Advertising router */
|
|
s32 sn; /* LS Sequence number */
|
|
u16 checksum;
|
|
u16 length;
|
|
};
|
|
|
|
|
|
/* In OSPFv2, options are embedded in higher half of type_raw */
|
|
static inline u8 lsa_get_options(struct ospf_lsa_header *lsa)
|
|
{ return lsa->type_raw >> 8; }
|
|
|
|
static inline void lsa_set_options(struct ospf_lsa_header *lsa, u16 options)
|
|
{ lsa->type_raw = (lsa->type_raw & 0xff) | (options << 8); }
|
|
|
|
|
|
struct ospf_lsa_rt
|
|
{
|
|
u32 options; /* VEB flags, mixed with link count for OSPFv2 and options for OSPFv3 */
|
|
};
|
|
|
|
struct ospf_lsa_rt2_link
|
|
{
|
|
u32 id;
|
|
u32 data;
|
|
#ifdef CPU_BIG_ENDIAN
|
|
u8 type;
|
|
u8 no_tos;
|
|
u16 metric;
|
|
#else
|
|
u16 metric;
|
|
u8 no_tos;
|
|
u8 type;
|
|
#endif
|
|
};
|
|
|
|
struct ospf_lsa_rt2_tos
|
|
{
|
|
#ifdef CPU_BIG_ENDIAN
|
|
u8 tos;
|
|
u8 padding;
|
|
u16 metric;
|
|
#else
|
|
u16 metric;
|
|
u8 padding;
|
|
u8 tos;
|
|
#endif
|
|
};
|
|
|
|
struct ospf_lsa_rt3_link
|
|
{
|
|
#ifdef CPU_BIG_ENDIAN
|
|
u8 type;
|
|
u8 padding;
|
|
u16 metric;
|
|
#else
|
|
u16 metric;
|
|
u8 padding;
|
|
u8 type;
|
|
#endif
|
|
u32 lif; /* Local interface ID */
|
|
u32 nif; /* Neighbor interface ID */
|
|
u32 id; /* Neighbor router ID */
|
|
};
|
|
|
|
|
|
struct ospf_lsa_net
|
|
{
|
|
u32 optx; /* Netmask for OSPFv2, options for OSPFv3 */
|
|
u32 routers[];
|
|
};
|
|
|
|
struct ospf_lsa_sum2
|
|
{
|
|
u32 netmask;
|
|
u32 metric;
|
|
};
|
|
|
|
struct ospf_lsa_sum3_net
|
|
{
|
|
u32 metric;
|
|
u32 prefix[];
|
|
};
|
|
|
|
struct ospf_lsa_sum3_rt
|
|
{
|
|
u32 options;
|
|
u32 metric;
|
|
u32 drid;
|
|
};
|
|
|
|
struct ospf_lsa_ext2
|
|
{
|
|
u32 netmask;
|
|
u32 metric;
|
|
u32 fwaddr;
|
|
u32 tag;
|
|
};
|
|
|
|
struct ospf_lsa_ext3
|
|
{
|
|
u32 metric;
|
|
u32 rest[];
|
|
};
|
|
|
|
struct ospf_lsa_ext_local
|
|
{
|
|
net_addr net;
|
|
ip_addr fwaddr;
|
|
u32 metric, ebit, fbit, tag, propagate, downwards;
|
|
u8 pxopts;
|
|
};
|
|
|
|
struct ospf_lsa_link
|
|
{
|
|
u32 options;
|
|
ip6_addr lladdr;
|
|
u32 pxcount;
|
|
u32 rest[];
|
|
};
|
|
|
|
struct ospf_lsa_prefix
|
|
{
|
|
#ifdef CPU_BIG_ENDIAN
|
|
u16 pxcount;
|
|
u16 ref_type;
|
|
#else
|
|
u16 ref_type;
|
|
u16 pxcount;
|
|
#endif
|
|
u32 ref_id;
|
|
u32 ref_rt;
|
|
u32 rest[];
|
|
};
|
|
|
|
struct ospf_tlv
|
|
{
|
|
#ifdef CPU_BIG_ENDIAN
|
|
u16 type;
|
|
u16 length;
|
|
#else
|
|
u16 length;
|
|
u16 type;
|
|
#endif
|
|
u32 data[];
|
|
};
|
|
|
|
|
|
static inline uint
|
|
lsa_net_count(struct ospf_lsa_header *lsa)
|
|
{
|
|
return (lsa->length - sizeof(struct ospf_lsa_header) - sizeof(struct ospf_lsa_net))
|
|
/ sizeof(u32);
|
|
}
|
|
|
|
/* In ospf_area->rtr we store paths to routers, but we use RID (and not IP address)
|
|
as index, so we need to encapsulate RID to IP address */
|
|
|
|
#define net_from_rid(x) NET_ADDR_IP4(ip4_from_u32(x), IP4_MAX_PREFIX_LENGTH)
|
|
#define rid_from_net(x) ip4_to_u32(((net_addr_ip4 *) x)->prefix)
|
|
|
|
#define IPV6_PREFIX_SPACE(x) ((((x) + 63) / 32) * 4)
|
|
#define IPV6_PREFIX_WORDS(x) (((x) + 63) / 32)
|
|
|
|
|
|
static inline int
|
|
ospf_valid_prefix(net_addr *n)
|
|
{
|
|
/*
|
|
* In OSPFv2, prefix is stored as netmask; ip4_masklen() returns 255 for
|
|
* invalid one. But OSPFv3-AF may receive IPv4 net with 32 < pxlen < 128.
|
|
*/
|
|
uint max = (n->type == NET_IP4) ? IP4_MAX_PREFIX_LENGTH : IP6_MAX_PREFIX_LENGTH;
|
|
return n->pxlen <= max;
|
|
}
|
|
|
|
/*
|
|
* In OSPFv3-AF (RFC 5835), IPv4 address is encoded by just placing it in the
|
|
* first 32 bits of IPv6 address and setting remaining bits to zero. Likewise
|
|
* for IPv4 prefix, where remaining bits do not matter. We use following
|
|
* functions to convert between IPv4 and IPv4-in-IPv6 representations:
|
|
*/
|
|
|
|
static inline ip4_addr ospf3_6to4(ip6_addr a)
|
|
{ return _MI4(_I0(a)); }
|
|
|
|
static inline ip6_addr ospf3_4to6(ip4_addr a)
|
|
{ return _MI6(_I(a), 0, 0, 0); }
|
|
|
|
|
|
static inline u32 *
|
|
ospf3_get_prefix(u32 *buf, int af, net_addr *n, u8 *pxopts, u16 *rest)
|
|
{
|
|
ip6_addr px = IP6_NONE;
|
|
uint pxlen = (*buf >> 24);
|
|
*pxopts = (*buf >> 16) & 0xff;
|
|
if (rest) *rest = *buf & 0xffff;
|
|
buf++;
|
|
|
|
if (pxlen > 0)
|
|
_I0(px) = *buf++;
|
|
if (pxlen > 32)
|
|
_I1(px) = *buf++;
|
|
if (pxlen > 64)
|
|
_I2(px) = *buf++;
|
|
if (pxlen > 96)
|
|
_I3(px) = *buf++;
|
|
|
|
/* Clean up remaining bits */
|
|
if (pxlen < 128)
|
|
px.addr[pxlen / 32] &= u32_mkmask(pxlen % 32);
|
|
|
|
if (af == NET_IP4)
|
|
net_fill_ip4(n, ospf3_6to4(px), pxlen);
|
|
else
|
|
net_fill_ip6(n, px, pxlen);
|
|
|
|
return buf;
|
|
}
|
|
|
|
static inline u32 *
|
|
ospf3_put_prefix(u32 *buf, net_addr *n, u8 pxopts, u16 rest)
|
|
{
|
|
ip6_addr px = (n->type == NET_IP4) ? ospf3_4to6(net4_prefix(n)) : net6_prefix(n);
|
|
uint pxlen = n->pxlen;
|
|
|
|
*buf++ = ((pxlen << 24) | (pxopts << 16) | rest);
|
|
|
|
if (pxlen > 0)
|
|
*buf++ = _I0(px);
|
|
if (pxlen > 32)
|
|
*buf++ = _I1(px);
|
|
if (pxlen > 64)
|
|
*buf++ = _I2(px);
|
|
if (pxlen > 96)
|
|
*buf++ = _I3(px);
|
|
|
|
return buf;
|
|
}
|
|
|
|
static inline u32 *
|
|
ospf3_get_addr(u32 *buf, int af, ip_addr *addr)
|
|
{
|
|
ip6_addr a;
|
|
memcpy(&a, buf, 16);
|
|
*addr = (af == NET_IP4) ? ipa_from_ip4(ospf3_6to4(a)) : ipa_from_ip6(a);
|
|
return buf + 4;
|
|
}
|
|
|
|
static inline u32 *
|
|
ospf3_put_addr(u32 *buf, ip_addr addr)
|
|
{
|
|
ip6_addr a = ipa_is_ip4(addr) ? ospf3_4to6(ipa_to_ip4(addr)) : ipa_to_ip6(addr);
|
|
memcpy(buf, &a, 16);
|
|
return buf + 4;
|
|
}
|
|
|
|
|
|
struct ospf_lsreq_header
|
|
{
|
|
u32 type;
|
|
u32 id;
|
|
u32 rt;
|
|
};
|
|
|
|
|
|
|
|
#define SH_ROUTER_SELF 0xffffffff
|
|
|
|
struct lsadb_show_data {
|
|
struct ospf_proto *proto; /* Protocol to request data from */
|
|
u16 type; /* LSA Type, 0 -> all */
|
|
u16 scope; /* Scope, 0 -> all, hack to handle link scope as 1 */
|
|
u32 area; /* Specified for area scope */
|
|
u32 lsid; /* LSA ID, 0 -> all */
|
|
u32 router; /* Advertising router, 0 -> all */
|
|
};
|
|
|
|
|
|
#define EA_OSPF_METRIC1 EA_CODE(PROTOCOL_OSPF, 0)
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#define EA_OSPF_METRIC2 EA_CODE(PROTOCOL_OSPF, 1)
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#define EA_OSPF_TAG EA_CODE(PROTOCOL_OSPF, 2)
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#define EA_OSPF_ROUTER_ID EA_CODE(PROTOCOL_OSPF, 3)
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/* ospf.c */
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void ospf_schedule_rtcalc(struct ospf_proto *p);
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static inline void ospf_notify_rt_lsa(struct ospf_area *oa)
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{ oa->update_rt_lsa = 1; }
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static inline void ospf_notify_net_lsa(struct ospf_iface *ifa)
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{ ifa->update_net_lsa = 1; }
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static inline void ospf_notify_link_lsa(struct ospf_iface *ifa)
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{ ifa->update_link_lsa = 1; }
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static inline int ospf_is_v2(struct ospf_proto *p)
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{ return p->ospf2; }
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static inline int ospf_is_v3(struct ospf_proto *p)
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{ return ! p->ospf2; }
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static inline int ospf_get_version(struct ospf_proto *p)
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{ return ospf_is_v2(p) ? 2 : 3; }
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static inline int ospf_is_ip4(struct ospf_proto *p)
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{ return p->p.net_type == NET_IP4; }
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static inline int ospf_is_ip6(struct ospf_proto *p)
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{ return p->p.net_type == NET_IP6; }
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static inline int ospf_get_af(struct ospf_proto *p)
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{ return p->p.net_type; }
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struct ospf_area *ospf_find_area(struct ospf_proto *p, u32 aid);
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static inline struct ospf_area *ospf_main_area(struct ospf_proto *p)
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{ return (p->areano == 1) ? HEAD(p->area_list) : p->backbone; }
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static inline int oa_is_stub(struct ospf_area *oa)
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{ return (oa->options & (OPT_E | OPT_N)) == 0; }
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static inline int oa_is_ext(struct ospf_area *oa)
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{ return oa->options & OPT_E; }
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static inline int oa_is_nssa(struct ospf_area *oa)
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{ return oa->options & OPT_N; }
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void ospf_stop_gr_recovery(struct ospf_proto *p);
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void ospf_sh_neigh(struct proto *P, const char *iff);
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void ospf_sh(struct proto *P);
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void ospf_sh_iface(struct proto *P, const char *iff);
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void ospf_sh_state(struct proto *P, int verbose, int reachable);
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void ospf_sh_lsadb(struct lsadb_show_data *ld);
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/* iface.c */
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void ospf_iface_chstate(struct ospf_iface *ifa, u8 state);
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void ospf_iface_sm(struct ospf_iface *ifa, int event);
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struct ospf_iface *ospf_iface_find(struct ospf_proto *p, struct iface *what);
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void ospf_if_notify(struct proto *P, uint flags, struct iface *iface);
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void ospf_ifa_notify2(struct proto *P, uint flags, struct ifa *a);
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void ospf_ifa_notify3(struct proto *P, uint flags, struct ifa *a);
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void ospf_iface_info(struct ospf_iface *ifa);
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void ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *ip);
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void ospf_iface_new_vlink(struct ospf_proto *p, struct ospf_iface_patt *ip);
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void ospf_iface_remove(struct ospf_iface *ifa);
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void ospf_iface_shutdown(struct ospf_iface *ifa);
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int ospf_iface_assure_bufsize(struct ospf_iface *ifa, uint plen);
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int ospf_iface_reconfigure(struct ospf_iface *ifa, struct ospf_iface_patt *new);
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void ospf_reconfigure_ifaces(struct ospf_proto *p);
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void ospf_open_vlink_sk(struct ospf_proto *p);
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struct nbma_node *find_nbma_node_(list *nnl, ip_addr ip);
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static inline struct nbma_node * find_nbma_node(struct ospf_iface *ifa, ip_addr ip)
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{ return find_nbma_node_(&ifa->nbma_list, ip); }
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static inline u32 ospf_iface_get_data(struct ospf_iface *ifa)
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{
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/*
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* Return expected value of the link data field in Rt-LSA for given iface.
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* It should be ifa->iface_id for unnumbered PtP links, IP address otherwise
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* (see RFC 2328 12.4.1.1). It is controlled by ifa->ptp_address field so it
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* can be overriden for compatibility purposes.
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*/
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return ((ifa->type == OSPF_IT_PTP) && !ifa->ptp_address) ?
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ifa->iface_id :
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ipa_to_u32(ifa->addr->ip);
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}
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/* neighbor.c */
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struct ospf_neighbor *ospf_neighbor_new(struct ospf_iface *ifa);
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void ospf_neigh_sm(struct ospf_neighbor *n, int event);
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void ospf_neigh_cancel_graceful_restart(struct ospf_neighbor *n);
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void ospf_neigh_notify_grace_lsa(struct ospf_neighbor *n, struct top_hash_entry *en);
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void ospf_neigh_lsadb_changed_(struct ospf_proto *p, struct top_hash_entry *en);
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void ospf_dr_election(struct ospf_iface *ifa);
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struct ospf_neighbor *find_neigh(struct ospf_iface *ifa, u32 rid);
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struct ospf_neighbor *find_neigh_by_ip(struct ospf_iface *ifa, ip_addr ip);
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void ospf_neigh_update_bfd(struct ospf_neighbor *n, int use_bfd);
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void ospf_sh_neigh_info(struct ospf_neighbor *n);
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static inline void ospf_neigh_lsadb_changed(struct ospf_proto *p, struct top_hash_entry *en)
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{ if (p->gr_count) ospf_neigh_lsadb_changed_(p, en); }
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/* packet.c */
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void ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type);
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int ospf_rx_hook(sock * sk, uint size);
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// void ospf_tx_hook(sock * sk);
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void ospf_err_hook(sock * sk, int err);
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void ospf_verr_hook(sock *sk, int err);
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void ospf_send_to(struct ospf_iface *ifa, ip_addr ip);
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void ospf_send_to_iface(struct ospf_iface *ifa);
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static inline void ospf_send_to_all(struct ospf_iface *ifa)
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{ ospf_send_to(ifa, ifa->all_routers); }
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static inline uint ospf_pkt_maxsize(struct ospf_iface *ifa)
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{ return ifa->tx_length - ifa->tx_hdrlen; }
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#ifndef PARSER
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#define DROP(DSC,VAL) do { err_dsc = DSC; err_val = VAL; goto drop; } while(0)
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#define DROP1(DSC) do { err_dsc = DSC; goto drop; } while(0)
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#define SKIP(DSC) do { err_dsc = DSC; goto skip; } while(0)
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#endif
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static inline uint ospf_pkt_hdrlen(struct ospf_proto *p)
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{ return ospf_is_v2(p) ? (sizeof(struct ospf_packet) + sizeof(union ospf_auth2)) : sizeof(struct ospf_packet); }
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static inline void * ospf_tx_buffer(struct ospf_iface *ifa)
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{ return ifa->sk->tbuf; }
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/* hello.c */
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#define OHS_HELLO 0
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#define OHS_POLL 1
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#define OHS_SHUTDOWN 2
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void ospf_send_hello(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn);
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void ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n, ip_addr faddr);
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uint ospf_hello3_options(struct ospf_packet *pkt);
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/* dbdes.c */
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void ospf_send_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
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void ospf_rxmt_dbdes(struct ospf_proto *p, struct ospf_neighbor *n);
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void ospf_reset_ldd(struct ospf_proto *p, struct ospf_neighbor *n);
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void ospf_receive_dbdes(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
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uint ospf_dbdes3_options(struct ospf_packet *pkt);
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/* lsreq.c */
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void ospf_send_lsreq(struct ospf_proto *p, struct ospf_neighbor *n);
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void ospf_receive_lsreq(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
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/* lsupd.c */
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void ospf_dump_lsahdr(struct ospf_proto *p, struct ospf_lsa_header *lsa_n);
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void ospf_dump_common(struct ospf_proto *p, struct ospf_packet *pkt);
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void ospf_lsa_lsrt_down_(struct top_hash_entry *en, struct ospf_neighbor *n, struct top_hash_entry *ret);
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void ospf_add_flushed_to_lsrt(struct ospf_proto *p, struct ospf_neighbor *n);
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void ospf_flood_event(void *ptr);
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int ospf_flood_lsa(struct ospf_proto *p, struct top_hash_entry *en, struct ospf_neighbor *from);
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int ospf_send_lsupd(struct ospf_proto *p, struct top_hash_entry **lsa_list, uint lsa_count, struct ospf_neighbor *n);
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void ospf_rxmt_lsupd(struct ospf_proto *p, struct ospf_neighbor *n);
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void ospf_receive_lsupd(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
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/* lsack.c */
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void ospf_enqueue_lsack(struct ospf_neighbor *n, struct ospf_lsa_header *h_n, int queue);
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void ospf_reset_lsack_queue(struct ospf_neighbor *n);
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void ospf_send_lsack(struct ospf_proto *p, struct ospf_neighbor *n, int queue);
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void ospf_receive_lsack(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n);
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#include "proto/ospf/rt.h"
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#include "proto/ospf/topology.h"
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#include "proto/ospf/lsalib.h"
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#endif /* _BIRD_OSPF_H_ */
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