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c494702929
The current OSPF neighbor retransmission operates on a single per-neighbor
periodic timer that sends all LSAs on the list when it expires.
Additionally, since it skips the first retransmission of received LSAs so
that at least the retransmission interval (resulting in a delay of between
the retransmission interval and twice the interval. In environments where
the links are lossy on P2MP networks with "delay-reflood" configured (which
relies on neighbor retransmission in partial meshs), the implementation
is sub-optimal (to say the least).
This commit reimplements OSPF neighbor retransmission as follows:
1. A new data structure making use the application managed
typesafe.h doubly linked list implements an OSPF LSA
list where each node includes a timestamp.
2. The existing neighbor LS retransmission LSDB data structure
is augmented with a pointer to the list node on the LSA
list to faciliate O(1) removal when the LSA is acknowledged.
3. The neighbor LS retransmission timer is set to the expiration
timer of the LSA at the top of the list.
4. When the timer expires, LSAs are retransmitted that within
the window of the current time and a small delta (50 milli-secs
default). The LSAs that are retransmited are given an updated
retransmission time and moved to the end of the LSA list.
5. Configuration is added to set the "retransmission-window" to a
value other than 50 milliseconds.
6. Neighbor and interface LSA retransmission counters are added
to provide insight into the lossiness of the links. However,
these will increment quickly on non-fully meshed P2MP networks
with "delay-reflood" configured.
7. Added a topotest to exercise the implementation on a non-fully
meshed P2MP network with "delay-reflood" configured. The
alternative was to use existing mechanisms to instroduce loss
but these seem less determistic in a topotest.
Signed-off-by: Acee Lindem <acee@lindem.com>
97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Defines and structures common to OSPFv2 and OSPFv3
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* Copyright (C) 1998, 99, 2000 Kunihiro Ishiguro, Toshiaki Takada
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*/
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#ifndef _LIBOSPFD_H
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#define _LIBOSPFD_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* IP precedence. */
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#ifndef IPTOS_PREC_INTERNETCONTROL
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#define IPTOS_PREC_INTERNETCONTROL 0xC0
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#endif /* IPTOS_PREC_INTERNETCONTROL */
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/* Default protocol, port number. */
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#ifndef IPPROTO_OSPFIGP
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#define IPPROTO_OSPFIGP 89
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#endif /* IPPROTO_OSPFIGP */
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/* Architectural Constants */
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#ifdef DEBUG
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#define OSPF_LS_REFRESH_TIME 120
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#else
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#define OSPF_LS_REFRESH_TIME 1800
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#endif
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#define OSPF_MIN_LS_INTERVAL 5000 /* msec */
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#define OSPF_MIN_LS_ARRIVAL 1000 /* in milliseconds */
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#define OSPF_LSA_INITIAL_AGE 0 /* useful for debug */
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#define OSPF_LSA_MAXAGE 3600
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#define OSPF_CHECK_AGE 300
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#define OSPF_LSA_MAXAGE_DIFF 900
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#define OSPF_LS_INFINITY 0xffffff
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#define OSPF_DEFAULT_DESTINATION 0x00000000 /* 0.0.0.0 */
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#define OSPF_INITIAL_SEQUENCE_NUMBER 0x80000001U
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#define OSPF_MAX_SEQUENCE_NUMBER 0x7fffffffU
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#define OSPF_INVALID_SEQUENCE_NUMBER 0x80000000U
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/* OSPF Interface Types */
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#define OSPF_IFTYPE_NONE 0
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#define OSPF_IFTYPE_POINTOPOINT 1
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#define OSPF_IFTYPE_BROADCAST 2
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#define OSPF_IFTYPE_NBMA 3
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#define OSPF_IFTYPE_POINTOMULTIPOINT 4
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#define OSPF_IFTYPE_VIRTUALLINK 5
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#define OSPF_IFTYPE_LOOPBACK 6
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#define OSPF_IFTYPE_MAX 7
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/* OSPF interface default values. */
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#define OSPF_OUTPUT_COST_DEFAULT 10
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#define OSPF_OUTPUT_COST_INFINITE UINT16_MAX
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#define OSPF_ROUTER_DEAD_INTERVAL_DEFAULT 40
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#define OSPF_ROUTER_DEAD_INTERVAL_MINIMAL 1
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#define OSPF_HELLO_INTERVAL_DEFAULT 10
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#define OSPF_HELLO_DELAY_DEFAULT 10
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#define OSPF_ROUTER_PRIORITY_DEFAULT 1
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#define OSPF_RETRANSMIT_INTERVAL_DEFAULT 5
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#define OSPF_RETRANSMIT_WINDOW_DEFAULT 50 /* milliseconds */
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#define OSPF_TRANSMIT_DELAY_DEFAULT 1
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#define OSPF_DEFAULT_BANDWIDTH 10000 /* Mbps */
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#define OSPF_DEFAULT_REF_BANDWIDTH 100000 /* Kbps */
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#define OSPF_POLL_INTERVAL_DEFAULT 60
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#define OSPF_NEIGHBOR_PRIORITY_DEFAULT 0
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#define OSPF_MTU_IGNORE_DEFAULT 0
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#define OSPF_FAST_HELLO_DEFAULT 0
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#define OSPF_P2MP_DELAY_REFLOOD_DEFAULT false
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#define OSPF_P2MP_NON_BROADCAST_DEFAULT false
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#define OSPF_OPAQUE_CAPABLE_DEFAULT true
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#define OSPF_PREFIX_SUPPRESSION_DEFAULT false
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#define OSPF_AREA_BACKBONE 0x00000000 /* 0.0.0.0 */
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#define OSPF_AREA_RANGE_COST_UNSPEC -1U
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#define OSPF_AREA_DEFAULT 0
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#define OSPF_AREA_STUB 1
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#define OSPF_AREA_NSSA 2
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#define OSPF_AREA_TYPE_MAX 3
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/* SPF Throttling timer values. */
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#define OSPF_SPF_DELAY_DEFAULT 0
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#define OSPF_SPF_HOLDTIME_DEFAULT 50
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#define OSPF_SPF_MAX_HOLDTIME_DEFAULT 5000
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#define OSPF_LSA_MAXAGE_CHECK_INTERVAL 30
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#define OSPF_LSA_MAXAGE_REMOVE_DELAY_DEFAULT 60
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#ifdef __cplusplus
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}
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#endif
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#endif /* _LIBOSPFD_H */
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