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BFD protocol, ready for release.

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Supports OSPF and BGP and also statically configured sessions.
This commit is contained in:
Ondrej Zajicek 2013-11-19 22:33:48 +01:00
parent 0e175f9f0f
commit 1ec522538f
25 changed files with 1043 additions and 227 deletions
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12
aclocal.m4 vendored
View File

@ -133,6 +133,18 @@ if test "$bird_cv_struct_ip_mreqn" = yes ; then
fi
])
AC_DEFUN(BIRD_CHECK_PTHREADS,
[
bird_tmp_cflags="$CFLAGS"
CFLAGS="$CFLAGS -pthread"
AC_CACHE_CHECK([whether POSIX threads are available], bird_cv_lib_pthreads,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], [[pthread_t pt; pthread_create(&pt, NULL, NULL, NULL); pthread_spinlock_t lock; pthread_spin_lock(&lock); ]])],
[bird_cv_lib_pthreads=yes], [bird_cv_lib_pthreads=no])])
CFLAGS="$bird_tmp_cflags"
])
AC_DEFUN(BIRD_CHECK_GCC_OPTION,
[
bird_tmp_cflags="$CFLAGS"

35
configure.in
View File

@ -10,6 +10,7 @@ AC_ARG_ENABLE(debug, [ --enable-debug enable internal debugging routin
AC_ARG_ENABLE(memcheck, [ --enable-memcheck check memory allocations when debugging (default: enabled)],,enable_memcheck=yes)
AC_ARG_ENABLE(client, [ --enable-client enable building of BIRD client (default: enabled)],,enable_client=yes)
AC_ARG_ENABLE(ipv6, [ --enable-ipv6 enable building of IPv6 version (default: disabled)],,enable_ipv6=no)
AC_ARG_ENABLE(pthreads, [ --enable-pthreads enable POSIX threads support (default: detect)],,enable_pthreads=try)
AC_ARG_WITH(suffix, [ --with-suffix=STRING use specified suffix for BIRD files (default: 6 for IPv6 version)],[given_suffix="yes"])
AC_ARG_WITH(sysconfig, [ --with-sysconfig=FILE use specified BIRD system configuration file])
AC_ARG_WITH(protocols, [ --with-protocols=LIST include specified routing protocols (default: all)],,[with_protocols="all"])
@ -47,11 +48,10 @@ AC_SUBST(runtimedir)
if test "$enable_ipv6" = yes ; then
ip=ipv6
SUFFIX=6
all_protocols=bfd,bgp,ospf,pipe,radv,rip,static
proto_radv=radv
else
ip=ipv4
SUFFIX=""
all_protocols=bfd,bgp,ospf,pipe,rip,static
fi
if test "$given_suffix" = yes ; then
@ -59,10 +59,6 @@ if test "$given_suffix" = yes ; then
fi
AC_SUBST(SUFFIX)
if test "$with_protocols" = all ; then
with_protocols="$all_protocols"
fi
if test "$enable_debug" = yes ; then
CONFIG_FILE="bird$SUFFIX.conf"
CONTROL_SOCKET="bird$SUFFIX.ctl"
@ -87,12 +83,29 @@ if test -z "$GCC" ; then
AC_MSG_ERROR([This program requires the GNU C Compiler.])
fi
if test "$enable_pthreads" != no ; then
BIRD_CHECK_PTHREADS
if test "$bird_cv_lib_pthreads" = yes ; then
AC_DEFINE(USE_PTHREADS)
CFLAGS="$CFLAGS -pthread"
LDFLAGS="$LDFLAGS -pthread"
proto_bfd=bfd
elif test "$enable_pthreads" = yes ; then
AC_MSG_ERROR([POSIX threads not available.])
fi
if test "$enable_pthreads" = try ; then
enable_pthreads="$bird_cv_lib_pthreads"
fi
fi
if test "$bird_cflags_default" = yes ; then
BIRD_CHECK_GCC_OPTION(bird_cv_c_option_wno_pointer_sign, -Wno-pointer-sign, -Wall)
BIRD_CHECK_GCC_OPTION(bird_cv_c_option_fno_strict_aliasing, -fno-strict-aliasing)
BIRD_CHECK_GCC_OPTION(bird_cv_c_option_fno_strict_overflow, -fno-strict-overflow)
CFLAGS="$CFLAGS -pthread -Wall -Wstrict-prototypes -Wno-parentheses"
CFLAGS="$CFLAGS -Wall -Wstrict-prototypes -Wno-parentheses"
BIRD_ADD_GCC_OPTION(bird_cv_c_option_wno_pointer_sign, -Wno-pointer-sign)
BIRD_ADD_GCC_OPTION(bird_cv_c_option_fno_strict_aliasing, -fno-strict-aliasing)
BIRD_ADD_GCC_OPTION(bird_cv_c_option_fno_strict_overflow, -fno-strict-overflow)
@ -183,6 +196,13 @@ fi
AC_SUBST(iproutedir)
all_protocols="$proto_bfd bgp ospf pipe $proto_radv rip static"
all_protocols=`echo $all_protocols | sed 's/ /,/g'`
if test "$with_protocols" = all ; then
with_protocols="$all_protocols"
fi
AC_MSG_CHECKING([protocols])
protocols=`echo "$with_protocols" | sed 's/,/ /g'`
if test "$protocols" = no ; then protocols= ; fi
@ -272,6 +292,7 @@ BIRD was configured with the following options:
Iproute2 directory: $iproutedir
System configuration: $sysdesc
Debugging: $enable_debug
POSIX threads: $enable_pthreads
Routing protocols: $protocols
Client: $enable_client
EOF

195
doc/bird.sgml
View File

@ -1244,6 +1244,178 @@ undefined value is regarded as empty clist for most purposes.
<chapt>Protocols
<sect><label id="sect-bfd">BFD
<sect1>Introduction
<p>Bidirectional Forwarding Detection (BFD) is not a routing protocol itself, it
is an independent tool providing liveness and failure detection. Routing
protocols like OSPF and BGP use integrated periodic "hello" messages to monitor
liveness of neighbors, but detection times of these mechanisms are high (e.g. 40
seconds by default in OSPF, could be set down to several seconds). BFD offers
universal, fast and low-overhead mechanism for failure detection, which could be
attached to any routing protocol in an advisory role.
<p>BFD consists of mostly independent BFD sessions. Each session monitors an
unicast bidirectional path between two BFD-enabled routers. This is done by
periodically sending control packets in both directions. BFD does not handle
neighbor discovery, BFD sessions are created on demand by request of other
protocols (like OSPF or BGP), which supply appropriate information like IP
addresses and associated interfaces. When a session changes its state, these
protocols are notified and act accordingly (e.g. break an OSPF adjacency when
the BFD session went down).
<p>BIRD implements basic BFD behavior as defined in
RFC 5880<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc5880.txt">
(some advanced features like the echo mode or authentication are not implemented),
IP transport for BFD as defined in
RFC 5881<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc5881.txt"> and
RFC 5883<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc5883.txt">
and interaction with client protocols as defined in
RFC 5882<htmlurl url="ftp://ftp.rfc-editor.org/in-notes/rfc5882.txt">.
<p>Note that BFD implementation in BIRD is currently a new feature in
development, expect some rough edges and possible UI and configuration changes
in the future. Also note that we currently support at most one protocol instance.
<sect1>Configuration
<p>BFD configuration consists mainly of multiple definitions of interfaces.
Most BFD config options are session specific. When a new session is requested
and dynamically created, it is configured from one of these definitions. For
sessions to directly connected neighbors, <cf/interface/ definitions are chosen
based on the interface associated with the session, while <cf/multihop/
definition is used for multihop sessions. If no definition is relevant, the
session is just created with the default configuration. Therefore, an empty BFD
configuration is often sufficient.
<p>Note that to use BFD for other protocols like OSPF or BGP, these protocols
also have to be configured to request BFD sessions, usually by <cf/bfd/ option.
<p>Some of BFD session options require <m/time/ value, which has to be specified
with the appropriate unit: <m/num/ <cf/s/|<cf/ms/|<cf/us/. Although microseconds
are allowed as units, practical minimum values are usually in order of tens of
milliseconds.
<code>
protocol bfd [&lt;name&gt;] {
interface &lt;interface pattern&gt; {
interval &lt;time&gt;;
min rx interval &lt;time&gt;;
min tx interval &lt;time&gt;;
idle tx interval &lt;time&gt;;
multiplier &lt;num&gt;;
passive &lt;switch&gt;;
};
multihop {
interval &lt;time&gt;;
min rx interval &lt;time&gt;;
min tx interval &lt;time&gt;;
idle tx interval &lt;time&gt;;
multiplier &lt;num&gt;;
passive &lt;switch&gt;;
};
neighbor &lt;ip&gt; [dev "&lt;interface&gt;"] [local &lt;ip&gt;] [multihop &lt;switch&gt;];
}
</code>
<descrip>
<tag>interface <m/pattern [, ...]/ { <m/options/ }</tag>
Interface definitions allow to specify options for sessions associated
with such interfaces and also may contain interface specific options.
See <ref id="dsc-iface" name="interface"> common option for a detailed
description of interface patterns. Note that contrary to the behavior of
<cf/interface/ definitions of other protocols, BFD protocol would accept
sessions (in default configuration) even on interfaces not covered by
such definitions.
<tag>multihop { <m/options/ }</tag>
Multihop definitions allow to specify options for multihop BFD sessions,
in the same manner as <cf/interface/ definitions are used for directly
connected sessions. Currently only one such definition (for all multihop
sessions) could be used.
<tag>neighbor <m/ip/ [dev "<m/interface/"] [local <m/ip/] [multihop <m/switch/]</tag>
BFD sessions are usually created on demand as requested by other
protocols (like OSPF or BGP). This option allows to explicitly add
a BFD session to the specified neighbor regardless of such requests.
The session is identified by the IP address of the neighbor, with
optional specification of used interface and local IP. By default
the neighbor must be directly connected, unless the the session is
configured as multihop. Note that local IP must be specified for
multihop sessions.
</descrip>
<p>Session specific options (part of <cf/interface/ and <cf/multihop/ definitions):
<descrip>
<tag>interval <m/time/</tag>
BFD ensures availability of the forwarding path associated with the
session by periodically sending BFD control packets in both
directions. The rate of such packets is controlled by two options,
<cf/min rx interval/ and <cf/min tx interval/ (see below). This option
is just a shorthand to set both of these options together.
<tag>min rx interval <m/time/</tag>
This option specifies the minimum RX interval, which is announced to the
neighbor and used there to limit the neighbor's rate of generated BFD
control packets. Default: 10 ms.
<tag>min tx interval <m/time/</tag>
This option specifies the desired TX interval, which controls the rate
of generated BFD control packets (together with <cf/min rx interval/
announced by the neighbor). Note that this value is used only if the BFD
session is up, otherwise the value of <cf/idle tx interval/ is used
instead. Default: 100 ms.
<tag>idle tx interval <m/time/</tag>
In order to limit unnecessary traffic in cases where a neighbor is not
available or not running BFD, the rate of generated BFD control packets
is lower when the BFD session is not up. This option specifies the
desired TX interval in such cases instead of <cf/min tx interval/.
Default: 1 s.
<tag>multiplier <m/num/</tag>
Failure detection time for BFD sessions is based on established rate of
BFD control packets (<cf>min rx/tx interval</cf>) multiplied by this
multiplier, which is essentially (ignoring jitter) a number of missed
packets after which the session is declared down. Note that rates and
multipliers could be different in each direction of a BFD session.
Default: 5.
<tag>passive <m/switch/</tag>
Generally, both BFD session endpoinds try to establish the session by
sending control packets to the other side. This option allows to enable
passive mode, which means that the router does not send BFD packets
until it has received one from the other side. Default: disabled.
</descrip>
<sect1>Example
<p><code>
protocol bfd {
interface "eth*" {
min rx interval 20 ms;
min tx interval 50 ms;
idle tx interval 300 ms;
};
interface "gre*" {
interval 200 ms;
multiplier 10;
passive;
};
multihop {
interval 200 ms;
multiplier 10;
};
neighbor 192.168.1.10;
neighbor 192.168.2.2 dev "eth2";
neighbor 192.168.10.1 local 192.168.1.1 multihop;
}
</code>
<sect>BGP
<p>The Border Gateway Protocol is the routing protocol used for backbone
@ -1258,8 +1430,8 @@ AS). Each AS is a part of the network with common management and
common routing policy. It is identified by a unique 16-bit number
(ASN). Routers within each AS usually exchange AS-internal routing
information with each other using an interior gateway protocol (IGP,
such as OSPF or RIP). Boundary routers at the border of
the AS communicate global (inter-AS) network reachability information with
such as OSPF or RIP). Boundary routers at the border of the AS
communicate global (inter-AS) network reachability information with
their neighbors in the neighboring AS'es via exterior BGP (eBGP) and
redistribute received information to other routers in the AS via
interior BGP (iBGP).
@ -1412,7 +1584,15 @@ for each neighbor using the following configuration parameters:
<tag>igp table <m/name/</tag> Specifies a table that is used
as an IGP routing table. Default: the same as the table BGP is
connected to.
<tag>bfd <M>switch</M></tag>
BGP could use BFD protocol as an advisory mechanism for neighbor
liveness and failure detection. If enabled, BIRD setups a BFD session
for the BGP neighbor and tracks its liveness by it. This has an
advantage of an order of magnitude lower detection times in case of
failure. Note that BFD protocol also has to be configured, see
<ref id="sect-bfd" name="BFD"> section for details. Default: disabled.
<tag>ttl security <m/switch/</tag> Use GTSM (RFC 5082 - the
generalized TTL security mechanism). GTSM protects against
spoofed packets by ignoring received packets with a smaller
@ -1986,6 +2166,7 @@ protocol ospf &lt;name&gt; {
real broadcast &lt;switch&gt;;
ptp netmask &lt;switch&gt;;
check link &lt;switch&gt;;
bfd &lt;switch&gt;;
ecmp weight &lt;num&gt;;
ttl security [&lt;switch&gt;; | tx only]
tx class|dscp &lt;num&gt;;
@ -2260,6 +2441,14 @@ protocol ospf &lt;name&gt; {
prefix) is propagated. It is possible that some hardware
drivers or platforms do not implement this feature. Default value is no.
<tag>bfd <M>switch</M></tag>
OSPF could use BFD protocol as an advisory mechanism for neighbor
liveness and failure detection. If enabled, BIRD setups a BFD session
for each OSPF neighbor and tracks its liveness by it. This has an
advantage of an order of magnitude lower detection times in case of
failure. Note that BFD protocol also has to be configured, see
<ref id="sect-bfd" name="BFD"> section for details. Default value is no.
<tag>ttl security [<m/switch/ | tx only]</tag>
TTL security is a feature that protects routing protocols
from remote spoofed packets by using TTL 255 instead of TTL 1

2
lib/birdlib.h
View File

@ -24,6 +24,8 @@
#define _MAX(a,b) (((a)>(b))?(a):(b))
#ifndef PARSER
#undef MIN
#undef MAX
#define MIN(a,b) _MIN(a,b)
#define MAX(a,b) _MAX(a,b)
#endif

2
lib/printf.c
View File

@ -276,7 +276,7 @@ int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
ip_ntox(va_arg(args, ip_addr), ipbuf);
else {
ip_ntop(va_arg(args, ip_addr), ipbuf);
if (field_width > 0)
if (field_width == 1)
field_width = STD_ADDRESS_P_LENGTH;
}
s = ipbuf;

7
nest/proto.c
View File

@ -681,6 +681,9 @@ proto_build(struct protocol *p)
}
}
/* FIXME: convert this call to some protocol hook */
extern void bfd_init_all(void);
/**
* protos_build - build a protocol list
*
@ -718,8 +721,10 @@ protos_build(void)
#ifdef CONFIG_BGP
proto_build(&proto_bgp);
#endif
// XXX
#ifdef CONFIG_BFD
proto_build(&proto_bfd);
bfd_init_all();
#endif
proto_pool = rp_new(&root_pool, "Protocols");
proto_flush_event = ev_new(proto_pool);

683
proto/bfd/bfd.c
View File

@ -4,6 +4,103 @@
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: Bidirectional Forwarding Detection
*
* The BFD protocol is implemented in three files: |bfd.c| containing the
* protocol logic and the protocol glue with BIRD core, |packets.c| handling BFD
* packet processing, RX, TX and protocol sockets. |io.c| then contains generic
* code for the event loop, threads and event sources (sockets, microsecond
* timers). This generic code will be merged to the main BIRD I/O code in the
* future.
*
* The BFD implementation uses a separate thread with an internal event loop for
* handling the protocol logic, which requires high-res and low-latency timing,
* so it is not affected by the rest of BIRD, which has several low-granularity
* hooks in the main loop, uses second-based timers and cannot offer good
* latency. The core of BFD protocol (the code related to BFD sessions,
* interfaces and packets) runs in the BFD thread, while the rest (the code
* related to BFD requests, BFD neighbors and the protocol glue) runs in the
* main thread.
*
* BFD sessions are represented by structure &bfd_session that contains a state
* related to the session and two timers (TX timer for periodic packets and hold
* timer for session timeout). These sessions are allocated from @session_slab
* and are accessible by two hash tables, @session_hash_id (by session ID) and
* @session_hash_ip (by IP addresses of neighbors). Slab and both hashes are in
* the main protocol structure &bfd_proto. The protocol logic related to BFD
* sessions is implemented in internal functions bfd_session_*(), which are
* expected to be called from the context of BFD thread, and external functions
* bfd_add_session(), bfd_remove_session() and bfd_reconfigure_session(), which
* form an interface to the BFD core for the rest and are expected to be called
* from the context of main thread.
*
* Each BFD session has an associated BFD interface, represented by structure
* &bfd_iface. A BFD interface contains a socket used for TX (the one for RX is
* shared in &bfd_proto), an interface configuration and reference counter.
* Compared to interface structures of other protocols, these structures are not
* created and removed based on interface notification events, but according to
* the needs of BFD sessions. When a new session is created, it requests a
* proper BFD interface by function bfd_get_iface(), which either finds an
* existing one in &iface_list (from &bfd_proto) or allocates a new one. When a
* session is removed, an associated iface is dicharged by bfd_free_iface().
*
* BFD requests are the external API for the other protocols. When a protocol
* wants a BFD session, it calls bfd_request_session(), which creates a
* structure &bfd_request containing approprite information and an notify hook.
* This structure is a resource associated with the caller's resource pool. When
* a BFD protocol is available, a BFD request is submitted to the protocol, an
* appropriate BFD session is found or created and the request is attached to
* the session. When a session changes state, all attached requests (and related
* protocols) are notified. Note that BFD requests do not depend on BFD protocol
* running. When the BFD protocol is stopped or removed (or not available from
* beginning), related BFD requests are stored in @bfd_wait_list, where waits
* for a new protocol.
*
* BFD neighbors are just a way to statically configure BFD sessions without
* requests from other protocol. Structures &bfd_neighbor are part of BFD
* configuration (like static routes in the static protocol). BFD neighbors are
* handled by BFD protocol like it is a BFD client -- when a BFD neighbor is
* ready, the protocol just creates a BFD request like any other protocol.
*
* The protocol uses a new generic event loop (structure &birdloop) from |io.c|,
* which supports sockets, timers and events like the main loop. Timers
* (structure &timer2) are new microsecond based timers, while sockets and
* events are the same. A birdloop is associated with a thread (field @thread)
* in which event hooks are executed. Most functions for setting event sources
* (like sk_start() or tm2_start()) must be called from the context of that
* thread. Birdloop allows to temporarily acquire the context of that thread for
* the main thread by calling birdloop_enter() and then birdloop_leave(), which
* also ensures mutual exclusion with all event hooks. Note that resources
* associated with a birdloop (like timers) should be attached to the
* independent resource pool, detached from the main resource tree.
*
* There are two kinds of interaction between the BFD core (running in the BFD
* thread) and the rest of BFD (running in the main thread). The first kind are
* configuration calls from main thread to the BFD thread (like bfd_add_session()).
* These calls are synchronous and use birdloop_enter() mechanism for mutual
* exclusion. The second kind is a notification about session changes from the
* BFD thread to the main thread. This is done in an asynchronous way, sesions
* with pending notifications are linked (in the BFD thread) to @notify_list in
* &bfd_proto, and then bfd_notify_hook() in the main thread is activated using
* bfd_notify_kick() and a pipe. The hook then processes scheduled sessions and
* calls hooks from associated BFD requests. This @notify_list (and state fields
* in structure &bfd_session) is protected by a spinlock in &bfd_proto and
* functions bfd_lock_sessions() / bfd_unlock_sessions().
*
* There are few data races (accessing @p->p.debug from TRACE() from the BFD
* thread and accessing some some private fields of %bfd_session from
* bfd_show_sessions() from the main thread, but these are harmless (i hope).
*
* TODO: document functions and access restrictions for fields in BFD structures.
*
* Supported standards:
* - RFC 5880 - main BFD standard
* - RFC 5881 - BFD for IP links
* - RFC 5882 - generic application of BFD
* - RFC 5883 - BFD for multihop paths
*/
#include "bfd.h"
@ -17,23 +114,34 @@
#define HASH_IP_EQ(a,b) ipa_equal(a,b)
#define HASH_IP_FN(k) ipa_hash(k)
static list bfd_proto_list;
static list bfd_wait_list;
const char *bfd_state_names[] = { "AdminDown", "Down", "Init", "Up" };
static void bfd_session_set_min_tx(struct bfd_session *s, u32 val);
static struct bfd_iface *bfd_get_iface(struct bfd_proto *p, ip_addr local, struct iface *iface);
static void bfd_free_iface(struct bfd_iface *ifa);
static inline void bfd_notify_kick(struct bfd_proto *p);
/*
* BFD sessions
*/
static void
bfd_session_update_state(struct bfd_session *s, uint state, uint diag)
{
struct bfd_proto *p = s->bfd;
struct bfd_proto *p = s->ifa->bfd;
uint old_state = s->loc_state;
int notify;
if (s->loc_state == state)
if (state == old_state)
return;
TRACE(D_EVENTS, "Session changed %I %d %d", s->addr, state, diag);
debug("STATE %I %d %d %d\n", s->addr, s->loc_state, state, diag);
TRACE(D_EVENTS, "Session to %I changed state from %s to %s",
s->addr, bfd_state_names[old_state], bfd_state_names[state]);
bfd_lock_sessions(p);
s->loc_state = state;
s->loc_diag = diag;
@ -43,23 +151,16 @@ bfd_session_update_state(struct bfd_session *s, uint state, uint diag)
add_tail(&p->notify_list, &s->n);
bfd_unlock_sessions(p);
if (state == BFD_STATE_UP)
bfd_session_set_min_tx(s, s->ifa->cf->min_tx_int);
if (old_state == BFD_STATE_UP)
bfd_session_set_min_tx(s, s->ifa->cf->idle_tx_int);
if (notify)
bfd_notify_kick(p);
}
static void
bfd_session_timeout(struct bfd_session *s)
{
s->rem_state = BFD_STATE_DOWN;
s->rem_id = 0;
s->rem_min_tx_int = 0;
s->rem_min_rx_int = 1;
s->rem_demand_mode = 0;
s->rem_detect_mult = 0;
bfd_session_update_state(s, BFD_STATE_DOWN, BFD_DIAG_TIMEOUT);
}
static void
bfd_session_update_tx_interval(struct bfd_session *s)
{
@ -93,10 +194,9 @@ bfd_session_update_detection_time(struct bfd_session *s, int kick)
}
static void
bfd_session_control_tx_timer(struct bfd_session *s)
bfd_session_control_tx_timer(struct bfd_session *s, int reset)
{
if (!s->opened)
goto stop;
// if (!s->opened) goto stop;
if (s->passive && (s->rem_id == 0))
goto stop;
@ -111,10 +211,12 @@ bfd_session_control_tx_timer(struct bfd_session *s)
goto stop;
/* So TX timer should run */
if (tm2_active(s->tx_timer))
return;
if (reset || !tm2_active(s->tx_timer))
{
s->last_tx = 0;
tm2_start(s->tx_timer, 0);
}
tm2_start(s->tx_timer, 0);
return;
stop:
@ -125,6 +227,10 @@ bfd_session_control_tx_timer(struct bfd_session *s)
static void
bfd_session_request_poll(struct bfd_session *s, u8 request)
{
/* Not sure about this, but doing poll in this case does not make sense */
if (s->rem_id == 0)
return;
s->poll_scheduled |= request;
if (s->poll_active)
@ -132,7 +238,8 @@ bfd_session_request_poll(struct bfd_session *s, u8 request)
s->poll_active = s->poll_scheduled;
s->poll_scheduled = 0;
bfd_send_ctl(s->bfd, s, 0);
bfd_session_control_tx_timer(s, 1);
}
static void
@ -146,11 +253,10 @@ bfd_session_terminate_poll(struct bfd_session *s)
if (poll_done & BFD_POLL_RX)
s->req_min_rx_int = s->req_min_rx_new;
s->poll_active = 0;
s->poll_active = s->poll_scheduled;
s->poll_scheduled = 0;
/* Timers are updated by caller - bfd_session_process_ctl() */
// xxx_restart_poll();
}
void
@ -191,10 +297,32 @@ bfd_session_process_ctl(struct bfd_session *s, u8 flags, u32 old_tx_int, u32 old
if (next_state)
bfd_session_update_state(s, next_state, diag);
bfd_session_control_tx_timer(s);
bfd_session_control_tx_timer(s, 0);
if (flags & BFD_FLAG_POLL)
bfd_send_ctl(s->bfd, s, 1);
bfd_send_ctl(s->ifa->bfd, s, 1);
}
static void
bfd_session_timeout(struct bfd_session *s)
{
struct bfd_proto *p = s->ifa->bfd;
TRACE(D_EVENTS, "Session to %I expired", s->addr);
s->rem_state = BFD_STATE_DOWN;
s->rem_id = 0;
s->rem_min_tx_int = 0;
s->rem_min_rx_int = 1;
s->rem_demand_mode = 0;
s->rem_detect_mult = 0;
s->poll_active = 0;
s->poll_scheduled = 0;
bfd_session_update_state(s, BFD_STATE_DOWN, BFD_DIAG_TIMEOUT);
bfd_session_control_tx_timer(s, 1);
}
static void
@ -255,8 +383,7 @@ bfd_tx_timer_hook(timer2 *t)
struct bfd_session *s = t->data;
s->last_tx = current_time();
// debug("TX %d\n", (s32) (s->last_tx TO_MS));
bfd_send_ctl(s->bfd, s, 0);
bfd_send_ctl(s->ifa->bfd, s, 0);
}
static void
@ -277,48 +404,53 @@ bfd_get_free_id(struct bfd_proto *p)
}
static struct bfd_session *
bfd_add_session(struct bfd_proto *p, ip_addr addr, struct bfd_session_config *opts)
bfd_add_session(struct bfd_proto *p, ip_addr addr, ip_addr local, struct iface *iface)
{
birdloop_enter(p->loop);
struct bfd_iface *ifa = bfd_get_iface(p, local, iface);
struct bfd_session *s = sl_alloc(p->session_slab);
bzero(s, sizeof(struct bfd_session));
s->addr = addr;
s->ifa = ifa;
s->loc_id = bfd_get_free_id(p);
debug("XXX INS1 %d %d %u %I\n", p->session_hash_id.count, p->session_hash_ip.count, s->loc_id, s->addr);
HASH_INSERT(p->session_hash_id, HASH_ID, s);
debug("XXX INS2 %d %d\n", p->session_hash_id.count, p->session_hash_ip.count);
HASH_INSERT(p->session_hash_ip, HASH_IP, s);
debug("XXX INS3 %d %d\n", p->session_hash_id.count, p->session_hash_ip.count);
s->bfd = p;
/* Initialization of state variables - see RFC 5880 6.8.1 */
s->loc_state = BFD_STATE_DOWN;
s->rem_state = BFD_STATE_DOWN;
s->des_min_tx_int = s->des_min_tx_new = opts->min_tx_int; // XXX opts->idle_tx_int;
s->req_min_rx_int = s->req_min_rx_new = opts->min_rx_int;
s->des_min_tx_int = s->des_min_tx_new = ifa->cf->idle_tx_int;
s->req_min_rx_int = s->req_min_rx_new = ifa->cf->min_rx_int;
s->rem_min_rx_int = 1;
s->detect_mult = opts->multiplier;
s->passive = opts->passive;
s->detect_mult = ifa->cf->multiplier;
s->passive = ifa->cf->passive;
s->tx_timer = tm2_new_init(p->tpool, bfd_tx_timer_hook, s, 0, 0);
s->hold_timer = tm2_new_init(p->tpool, bfd_hold_timer_hook, s, 0, 0);
bfd_session_update_tx_interval(s);
bfd_session_control_tx_timer(s, 1);
init_list(&s->request_list);
s->last_state_change = now;
TRACE(D_EVENTS, "Session to %I added", s->addr);
birdloop_leave(p->loop);
return s;
}
/*
static void
bfd_open_session(struct bfd_proto *p, struct bfd_session *s, ip_addr local, struct iface *ifa)
{
birdloop_enter(p->loop);
s->bsock = bfd_get_socket(p, local, ifa);
// s->local = local;
// s->iface = ifa;
s->opened = 1;
bfd_session_control_tx_timer(s);
@ -331,10 +463,6 @@ bfd_close_session(struct bfd_proto *p, struct bfd_session *s)
{
birdloop_enter(p->loop);
bfd_free_socket(s->bsock);
s->bsock = NULL;
// s->local = IPA_NONE;
// s->iface = NULL;
s->opened = 0;
bfd_session_update_state(s, BFD_STATE_DOWN, BFD_DIAG_PATH_DOWN);
@ -342,54 +470,295 @@ bfd_close_session(struct bfd_proto *p, struct bfd_session *s)
birdloop_leave(p->loop);
}
*/
static void
bfd_remove_session(struct bfd_proto *p, struct bfd_session *s)
{
ip_addr ip = s->addr;
birdloop_enter(p->loop);
bfd_free_socket(s->bsock);
bfd_free_iface(s->ifa);
rfree(s->tx_timer);
rfree(s->hold_timer);
debug("XXX REM1 %d %d %u %I\n", p->session_hash_id.count, p->session_hash_ip.count, s->loc_id, s->addr);
HASH_REMOVE(p->session_hash_id, HASH_ID, s);
debug("XXX REM2 %d %d\n", p->session_hash_id.count, p->session_hash_ip.count);
HASH_REMOVE(p->session_hash_ip, HASH_IP, s);
debug("XXX REM3 %d %d\n", p->session_hash_id.count, p->session_hash_ip.count);
sl_free(p->session_slab, s);
TRACE(D_EVENTS, "Session to %I removed", ip);
birdloop_leave(p->loop);
}
static void
bfd_configure_session(struct bfd_proto *p, struct bfd_session *s,
struct bfd_session_config *opts)
bfd_reconfigure_session(struct bfd_proto *p, struct bfd_session *s)
{
birdloop_enter(p->loop);
// XXX opts->idle_tx_int;
struct bfd_iface_config *cf = s->ifa->cf;
bfd_session_set_min_tx(s, opts->min_tx_int);
bfd_session_set_min_rx(s, opts->min_rx_int);
s->detect_mult = opts->multiplier;
s->passive = opts->passive;
u32 tx = (s->loc_state == BFD_STATE_UP) ? cf->min_tx_int : cf->idle_tx_int;
bfd_session_set_min_tx(s, tx);
bfd_session_set_min_rx(s, cf->min_rx_int);
s->detect_mult = cf->multiplier;
s->passive = cf->passive;
bfd_session_control_tx_timer(s);
bfd_session_control_tx_timer(s, 0);
birdloop_leave(p->loop);
TRACE(D_EVENTS, "Session to %I reconfigured", s->addr);
}
/*
* BFD interfaces
*/
static struct bfd_iface_config bfd_default_iface = {
.min_rx_int = BFD_DEFAULT_MIN_RX_INT,
.min_tx_int = BFD_DEFAULT_MIN_TX_INT,
.idle_tx_int = BFD_DEFAULT_IDLE_TX_INT,
.multiplier = BFD_DEFAULT_MULTIPLIER
};
static inline struct bfd_iface_config *
bfd_find_iface_config(struct bfd_config *cf, struct iface *iface)
{
struct bfd_iface_config *ic;
ic = iface ? (void *) iface_patt_find(&cf->patt_list, iface, NULL) : cf->multihop;
return ic ? ic : &bfd_default_iface;
}
static struct bfd_iface *
bfd_get_iface(struct bfd_proto *p, ip_addr local, struct iface *iface)
{
struct bfd_iface *ifa;
WALK_LIST(ifa, p->iface_list)
if (ipa_equal(ifa->local, local) && (ifa->iface == iface))
return ifa->uc++, ifa;
struct bfd_config *cf = (struct bfd_config *) (p->p.cf);
struct bfd_iface_config *ic = bfd_find_iface_config(cf, iface);
ifa = mb_allocz(p->tpool, sizeof(struct bfd_iface));
ifa->local = local;
ifa->iface = iface;
ifa->cf = ic;
ifa->bfd = p;
ifa->sk = bfd_open_tx_sk(p, local, iface);
ifa->uc = 1;
add_tail(&p->iface_list, &ifa->n);
return ifa;
}
static void
bfd_free_iface(struct bfd_iface *ifa)
{
if (!ifa || --ifa->uc)
return;
rem_node(&ifa->n);
sk_stop(ifa->sk);
rfree(ifa->sk);
mb_free(ifa);
}
static void
bfd_reconfigure_iface(struct bfd_proto *p, struct bfd_iface *ifa, struct bfd_config *nc)
{
struct bfd_iface_config *nic = bfd_find_iface_config(nc, ifa->iface);
ifa->changed = !!memcmp(nic, ifa->cf, sizeof(struct bfd_iface_config));
/* This should be probably changed to not access ifa->cf from the BFD thread */
birdloop_enter(p->loop);
ifa->cf = nic;
birdloop_leave(p->loop);
}
/*
* BFD requests
*/
static void
bfd_request_notify(struct bfd_request *req, u8 state, u8 diag)
{
u8 old_state = req->state;
if (state == old_state)
return;
req->state = state;
req->diag = diag;
req->old_state = old_state;
req->down = (old_state == BFD_STATE_UP) && (state == BFD_STATE_DOWN);
if (req->hook)
req->hook(req);
}
static int
bfd_add_request(struct bfd_proto *p, struct bfd_request *req)
{
struct bfd_session *s = bfd_find_session_by_addr(p, req->addr);
u8 state, diag;
if (!s)
s = bfd_add_session(p, req->addr, req->local, req->iface);
rem_node(&req->n);
add_tail(&s->request_list, &req->n);
req->session = s;
bfd_lock_sessions(p);
state = s->loc_state;
diag = s->loc_diag;
bfd_unlock_sessions(p);
bfd_request_notify(req, state, diag);
return 1;
}
static void
bfd_submit_request(struct bfd_request *req)
{
node *n;
WALK_LIST(n, bfd_proto_list)
if (bfd_add_request(SKIP_BACK(struct bfd_proto, bfd_node, n), req))
return;
rem_node(&req->n);
add_tail(&bfd_wait_list, &req->n);
req->session = NULL;
bfd_request_notify(req, BFD_STATE_ADMIN_DOWN, 0);
}
static void
bfd_take_requests(struct bfd_proto *p)
{
node *n, *nn;
WALK_LIST_DELSAFE(n, nn, bfd_wait_list)
bfd_add_request(p, SKIP_BACK(struct bfd_request, n, n));
}
static void
bfd_drop_requests(struct bfd_proto *p)
{
node *n;
HASH_WALK(p->session_hash_id, next_id, s)
{
/* We assume that p is not in bfd_proto_list */
WALK_LIST_FIRST(n, s->request_list)
bfd_submit_request(SKIP_BACK(struct bfd_request, n, n));
}
HASH_WALK_END;
}
static struct resclass bfd_request_class;
struct bfd_request *
bfd_request_session(pool *p, ip_addr addr, ip_addr local, struct iface *iface,
void (*hook)(struct bfd_request *), void *data)
{
struct bfd_request *req = ralloc(p, &bfd_request_class);
/* Hack: self-link req->n, we will call rem_node() on it */
req->n.prev = req->n.next = &req->n;
req->addr = addr;
req->local = local;
req->iface = iface;
bfd_submit_request(req);
req->hook = hook;
req->data = data;
return req;
}
static void
bfd_request_free(resource *r)
{
struct bfd_request *req = (struct bfd_request *) r;
struct bfd_session *s = req->session;
rem_node(&req->n);
/* Remove the session if there is no request for it. Skip that if
inside notify hooks, will be handled by bfd_notify_hook() itself */
if (s && EMPTY_LIST(s->request_list) && !s->notify_running)
bfd_remove_session(s->ifa->bfd, s);
}
static void
bfd_request_dump(resource *r)
{
struct bfd_request *req = (struct bfd_request *) r;
debug("(code %p, data %p)\n", req->hook, req->data);
}
static struct resclass bfd_request_class = {
"BFD request",
sizeof(struct bfd_request),
bfd_request_free,
bfd_request_dump,
NULL,
NULL
};
/*
* BFD neighbors
*/
static void
bfd_neigh_notify(struct neighbor *nb)
{
struct bfd_proto *p = (struct bfd_proto *) nb->proto;
struct bfd_neighbor *n = nb->data;
if (!n)
return;
if ((nb->scope > 0) && !n->req)
{
ip_addr local = ipa_nonzero(n->local) ? n->local : nb->iface->addr->ip;
n->req = bfd_request_session(p->p.pool, n->addr, local, nb->iface, NULL, NULL);
}
if ((nb->scope <= 0) && n->req)
{
rfree(n->req);
n->req = NULL;
}
}
static void
bfd_start_neighbor(struct bfd_proto *p, struct bfd_neighbor *n)
{
n->session = bfd_add_session(p, n->addr, n->opts);
n->active = 1;
if (n->opts->multihop)
if (n->multihop)
{
bfd_open_session(p, n->session, n->local, NULL);
n->req = bfd_request_session(p->p.pool, n->addr, n->local, NULL, NULL, NULL);
return;
}
@ -402,14 +771,15 @@ bfd_start_neighbor(struct bfd_proto *p, struct bfd_neighbor *n)
if (nb->data)
{
log(L_ERR "%s: Duplicate remote address %I", p->p.name, n->addr);
log(L_ERR "%s: Duplicate neighbor %I", p->p.name, n->addr);
return;
}
nb->data = n->session;
n->neigh = nb;
nb->data = n;
if (nb->scope > 0)
bfd_open_session(p, n->session, nb->iface->addr->ip, nb->iface);
bfd_neigh_notify(nb);
else
TRACE(D_EVENTS, "Waiting for %I%J to become my neighbor", n->addr, n->iface);
}
@ -417,33 +787,54 @@ bfd_start_neighbor(struct bfd_proto *p, struct bfd_neighbor *n)
static void
bfd_stop_neighbor(struct bfd_proto *p, struct bfd_neighbor *n)
{
if (!n->opts->multihop)
{
struct neighbor *nb = neigh_find2(&p->p, &n->addr, n->iface, 0);
if (nb)
nb->data = NULL;
}
if (n->neigh)
n->neigh->data = NULL;
n->neigh = NULL;
bfd_remove_session(p, n->session);
rfree(n->req);
n->req = NULL;
}
static inline int
bfd_same_neighbor(struct bfd_neighbor *x, struct bfd_neighbor *y)
{
return ipa_equal(x->addr, y->addr) && ipa_equal(x->local, y->local) &&
(x->iface == y->iface) && (x->multihop == y->multihop);
}
static void
bfd_neigh_notify(struct neighbor *nb)
bfd_reconfigure_neighbors(struct bfd_proto *p, struct bfd_config *new)
{
struct bfd_proto *p = (struct bfd_proto *) nb->proto;
struct bfd_session *s = nb->data;
struct bfd_config *old = (struct bfd_config *) (p->p.cf);
struct bfd_neighbor *on, *nn;
if (!s)
return;
WALK_LIST(on, old->neigh_list)
{
WALK_LIST(nn, new->neigh_list)
if (bfd_same_neighbor(nn, on))
{
nn->neigh = on->neigh;
if (nn->neigh)
nn->neigh->data = nn;
if ((nb->scope > 0) && !s->opened)
bfd_open_session(p, s, nb->iface->addr->ip, nb->iface);
nn->req = on->req;
nn->active = 1;
return;
}
if ((nb->scope <= 0) && s->opened)
bfd_close_session(p, s);
bfd_stop_neighbor(p, on);
}
WALK_LIST(nn, new->neigh_list)
if (!nn->active)
bfd_start_neighbor(p, nn);
}
/*
* BFD notify socket
*/
/* This core notify code should be replaced after main loop transition to birdloop */
int pipe(int pipefd[2]);
@ -456,6 +847,8 @@ bfd_notify_hook(sock *sk, int len)
struct bfd_proto *p = sk->data;
struct bfd_session *s;
list tmp_list;
u8 state, diag;
node *n, *nn;
pipe_drain(sk->fd);
@ -469,10 +862,21 @@ bfd_notify_hook(sock *sk, int len)
{
bfd_lock_sessions(p);
rem2_node(&s->n);
state = s->loc_state;
diag = s->loc_diag;
bfd_unlock_sessions(p);
// XXX do something
TRACE(D_EVENTS, "Notify: session changed %I %d %d", s->addr, s->loc_state, s->loc_diag);
/* FIXME: convert to btime and move to bfd_session_update_state() */
s->last_state_change = now;
s->notify_running = 1;
WALK_LIST_DELSAFE(n, nn, s->request_list)
bfd_request_notify(SKIP_BACK(struct bfd_request, n, n), state, diag);
s->notify_running = 0;
/* Remove the session if all requests were removed in notify hooks */
if (EMPTY_LIST(s->request_list))
bfd_remove_session(p, s);
}
return 0;
@ -523,6 +927,17 @@ bfd_notify_init(struct bfd_proto *p)
}
/*
* BFD protocol glue
*/
void
bfd_init_all(void)
{
init_list(&bfd_proto_list);
init_list(&bfd_wait_list);
}
static struct proto *
bfd_init(struct proto_config *c)
{
@ -539,25 +954,28 @@ bfd_start(struct proto *P)
struct bfd_proto *p = (struct bfd_proto *) P;
struct bfd_config *cf = (struct bfd_config *) (P->cf);
p->loop = birdloop_new(P->pool);
p->loop = birdloop_new();
p->tpool = rp_new(NULL, "BFD thread root");
pthread_spin_init(&p->lock, PTHREAD_PROCESS_PRIVATE);
p->session_slab = sl_new(P->pool, sizeof(struct bfd_session));
HASH_INIT(p->session_hash_id, P->pool, 4);
HASH_INIT(p->session_hash_ip, P->pool, 4);
init_list(&p->sock_list);
HASH_INIT(p->session_hash_id, P->pool, 8);
HASH_INIT(p->session_hash_ip, P->pool, 8);
init_list(&p->iface_list);
init_list(&p->notify_list);
bfd_notify_init(p);
add_tail(&bfd_proto_list, &p->bfd_node);
birdloop_enter(p->loop);
p->rx_1 = bfd_open_rx_sk(p, 0);
p->rx_m = bfd_open_rx_sk(p, 1);
birdloop_leave(p->loop);
bfd_take_requests(p);
struct bfd_neighbor *n;
WALK_LIST(n, cf->neigh_list)
bfd_start_neighbor(p, n);
@ -572,76 +990,79 @@ static int
bfd_shutdown(struct proto *P)
{
struct bfd_proto *p = (struct bfd_proto *) P;
struct bfd_config *cf = (struct bfd_config *) (P->cf);
rem_node(&p->bfd_node);
birdloop_stop(p->loop);
struct bfd_neighbor *n;
WALK_LIST(n, cf->neigh_list)
bfd_stop_neighbor(p, n);
bfd_drop_requests(p);
/* FIXME: This is hack */
birdloop_enter(p->loop);
rfree(p->tpool);
birdloop_leave(p->loop);
birdloop_free(p->loop);
return PS_DOWN;
}
static inline int
bfd_same_neighbor(struct bfd_neighbor *x, struct bfd_neighbor *y)
{
return ipa_equal(x->addr, y->addr) && ipa_equal(x->local, y->local) &&
(x->iface == y->iface) && (x->opts->multihop == y->opts->multihop);
}
static void
bfd_match_neighbor(struct bfd_proto *p, struct bfd_neighbor *on, struct bfd_config *new)
{
struct bfd_neighbor *nn;
WALK_LIST(nn, new->neigh_list)
if (bfd_same_neighbor(nn, on))
{
nn->session = on->session;
bfd_configure_session(p, nn->session, nn->opts);
return;
}
bfd_stop_neighbor(p, on);
}
static int
bfd_reconfigure(struct proto *P, struct proto_config *c)
{
struct bfd_proto *p = (struct bfd_proto *) P;
struct bfd_config *old = (struct bfd_config *) (P->cf);
// struct bfd_config *old = (struct bfd_config *) (P->cf);
struct bfd_config *new = (struct bfd_config *) c;
struct bfd_neighbor *n;
struct bfd_iface *ifa;
birdloop_mask_wakeups(p->loop);
WALK_LIST(n, old->neigh_list)
bfd_match_neighbor(p, n, new);
WALK_LIST(ifa, p->iface_list)
bfd_reconfigure_iface(p, ifa, new);
WALK_LIST(n, new->neigh_list)
if (!n->session)
bfd_start_neighbor(p, n);
HASH_WALK(p->session_hash_id, next_id, s)
{
if (s->ifa->changed)
bfd_reconfigure_session(p, s);
}
HASH_WALK_END;
bfd_reconfigure_neighbors(p, new);
birdloop_unmask_wakeups(p->loop);
return 1;
}
/* Ensure one instance */
struct bfd_config *bfd_cf;
static void
bfd_preconfig(struct protocol *P UNUSED, struct config *c UNUSED)
{
bfd_cf = NULL;
}
static void
bfd_copy_config(struct proto_config *dest, struct proto_config *src)
{
struct bfd_config *d = (struct bfd_config *) dest;
// struct bfd_config *s = (struct bfd_config *) src;
/* We clean up neigh_list, ifaces are non-sharable */
/* We clean up patt_list and neigh_list, neighbors and ifaces are non-sharable */
init_list(&d->patt_list);
init_list(&d->neigh_list);
}
void
bfd_show_sessions(struct proto *P)
{
byte tbuf[TM_DATETIME_BUFFER_SIZE];
struct bfd_proto *p = (struct bfd_proto *) P;
uint state, diag;
u32 tx_int, timeout;
@ -655,22 +1076,25 @@ bfd_show_sessions(struct proto *P)
}
cli_msg(-1013, "%s:", p->p.name);
cli_msg(-1013, "%-12s\t%s\t%s\t%s\t%s", "Router IP", "Iface",
"State", "TX Int", "Timeout");
cli_msg(-1013, "%-25s %-10s %-10s %-10s %8s %8s",
"IP address", "Interface", "State", "Since", "Interval", "Timeout");
debug("XXX WALK %d %d\n", p->session_hash_id.count, p->session_hash_ip.count);
HASH_WALK(p->session_hash_id, next_id, s)
{
// FIXME this is unsafe
/* FIXME: this is thread-unsafe, but perhaps harmless */
state = s->loc_state;
diag = s->loc_diag;
ifname = (s->bsock && s->bsock->sk->iface) ? s->bsock->sk->iface->name : "---";
tx_int = (MAX(s->des_min_tx_int, s->rem_min_rx_int) TO_MS);
ifname = (s->ifa && s->ifa->sk->iface) ? s->ifa->sk->iface->name : "---";
tx_int = s->last_tx ? (MAX(s->des_min_tx_int, s->rem_min_rx_int) TO_MS) : 0;
timeout = (MAX(s->req_min_rx_int, s->rem_min_tx_int) TO_MS) * s->rem_detect_mult;
cli_msg(-1013, "%I\t%s\t%s %d\t%u\t%u",
s->addr, ifname, bfd_state_names[state], diag, tx_int, timeout);
state = (state < 4) ? state : 0;
tm_format_datetime(tbuf, &config->tf_proto, s->last_state_change);
cli_msg(-1013, "%-25I %-10s %-10s %-10s %3u.%03u %3u.%03u",
s->addr, ifname, bfd_state_names[state], tbuf,
tx_int / 1000, tx_int % 1000, timeout / 1000, timeout % 1000);
}
HASH_WALK_END;
@ -685,5 +1109,6 @@ struct protocol proto_bfd = {
.start = bfd_start,
.shutdown = bfd_shutdown,
.reconfigure = bfd_reconfigure,
.preconfig = bfd_preconfig,
.copy_config = bfd_copy_config,
};

42
proto/bfd/bfd.h
View File

@ -20,6 +20,7 @@
#include "lib/socket.h"
#include "lib/string.h"
#include "nest/bfd.h"
#include "io.h"
@ -33,19 +34,23 @@
#define BFD_DEFAULT_MULTIPLIER 5
struct bfd_iface_config;
struct bfd_config
{
struct proto_config c;
list neigh_list; /* List of struct bfd_neighbor */
list patt_list; /* List of iface configs (struct bfd_iface_config) */
list neigh_list; /* List of configured neighbors (struct bfd_neighbor) */
struct bfd_iface_config *multihop; /* Multihop pseudoiface config */
};
struct bfd_session_config
struct bfd_iface_config
{
struct iface_patt i;
u32 min_rx_int;
u32 min_tx_int;
u32 idle_tx_int;