Date: Tue, 30 Jan 2001 10:37:42 +0100 (CET) From: Harti Brandt <brandt@fokus.gmd.de> To: Julian Elischer <julian@elischer.org> Cc: julian@freebsd.org, freebsd-net@freebsd.org, archie@freebsd.org Subject: Re: netgraph: problem in ng_base Message-ID: <Pine.BSF.4.21.0101301025520.5981-100000@beagle.fokus.gmd.de> In-Reply-To: <3A768232.282B28E6@elischer.org>
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On Tue, 30 Jan 2001, Julian Elischer wrote:
JE>using ngctl and 'hole' nodes in this configuration I cannot make this happen.
I tried the following two things:
-----------------------------------------------------
500 [root] (beagle) /tmp # ngctl
+ mkpeer sscfu mine upper
+ name mine sscf
+ mkpeer sscf: sscop lower upper
+ name sscf:lower sscop
+ connect sscop: fatm0: lower sig
+ list
There are 5 total nodes:
Name: sscop Type: sscop ID: 00000011 Num hooks: 2
Name: sscf Type: sscfu ID: 00000010 Num hooks: 2
Name: ngctl12169 Type: socket ID: 0000000f Num hooks: 1
Name: fatm1 Type: atm ID: 00000002 Num hooks: 0
Name: fatm0 Type: atm ID: 00000001 Num hooks: 1
+ show sscf:
Name: sscf Type: sscfu ID: 00000010 Num hooks: 2
Local hook Peer name Peer type Peer ID Peer hook
---------- --------- --------- ------- ---------
lower sscop sscop 00000011 upper
upper ngctl12169 socket 0000000f mine
+ show sscop:
Name: sscop Type: sscop ID: 00000011 Num hooks: 2
Local hook Peer name Peer type Peer ID Peer hook
---------- --------- --------- ------- ---------
lower fatm0 atm 00000001 sig
upper sscf sscfu 00000010 lower
+ msg fatm0: cpcsinit {name="sig" aal=5 vci=5}
Rec'd response "cpcsinit" (4) from "[1]:":
Args: {}
+
Rec'd data packet on hook "mine":
0000: 01 00 00 00 ....
+ shutdown sscf:
+ shutdown sscop:
+ list
There are 3 total nodes:
Name: ngctl12169 Type: socket ID: 0000000f Num hooks: 0
Name: fatm1 Type: atm ID: 00000002 Num hooks: 0
Name: fatm0 Type: atm ID: 00000001 Num hooks: 0
+ ^C
The cpcsinit opens the ATM VCI and sends the AAL5 frames out the named
hook. The data is an SSCOP begin PDU.
In /var/log/messages I have:
Jan 30 10:15:00 beagle /boot/kernel/kernel: changing state from SSCOP_OUT_DIS_PEND to SSCOP_IDLE
Jan 30 10:15:00 beagle /boot/kernel/kernel: disconnect 0xc2c54840 from 0xc2c94d00 (invalid) refs=3 flags=9
Jan 30 10:15:00 beagle /boot/kernel/kernel: ng_sscop_shutdown: 0xc2c94d00 refs=2 flags=9
Jan 30 10:15:00 beagle /boot/kernel/kernel: Accessing freed node node: ID [11]: type 'sscop', 0 hooks, flags 0x9, 0 refs, :
Jan 30 10:15:00 beagle /boot/kernel/kernel: Last active @ /usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c, line 735
Jan 30 10:15:00 beagle /boot/kernel/kernel: problem discovered at file /usr/src/sys/modules/netgraph/netgraph/../../../netgraph/ng_base.c, line 2436
-----------------------------------
The 2nd test is exactly the same, except I do not do the cpcsinit:
+ mkpeer sscfu mine upper
+ name mine sscf
+ mkpeer sscf: sscop lower upper
+ name sscf:lower sscop
+ connect sscop: fatm0: lower sig
+ list
There are 5 total nodes:
Name: sscop Type: sscop ID: 00000014 Num hooks: 2
Name: sscf Type: sscfu ID: 00000013 Num hooks: 2
Name: ngctl12184 Type: socket ID: 00000012 Num hooks: 1
Name: fatm1 Type: atm ID: 00000002 Num hooks: 0
Name: fatm0 Type: atm ID: 00000001 Num hooks: 1
+ show sscf:
Name: sscf Type: sscfu ID: 00000013 Num hooks: 2
Local hook Peer name Peer type Peer ID Peer hook
---------- --------- --------- ------- ---------
lower sscop sscop 00000014 upper
upper ngctl12184 socket 00000012 mine
+ show sscop:
Name: sscop Type: sscop ID: 00000014 Num hooks: 2
Local hook Peer name Peer type Peer ID Peer hook
---------- --------- --------- ------- ---------
lower fatm0 atm 00000001 sig
upper sscf sscfu 00000013 lower
+ shutdown sscf:
+ shutdown sscop:
+ list
There are 3 total nodes:
Name: ngctl12184 Type: socket ID: 00000012 Num hooks: 0
Name: fatm1 Type: atm ID: 00000002 Num hooks: 0
Name: fatm0 Type: atm ID: 00000001 Num hooks: 0
+ ^D
Now everything is ok. In /var/log/messages I have:
Jan 30 10:18:42 beagle /boot/kernel/kernel: disconnect 0xc2c54740 from 0xc2c94c00 (valid) refs=4 flags=0
Jan 30 10:19:12 beagle /boot/kernel/kernel: disconnect 0xc2c54940 from 0xc2c94c00 (invalid) refs=4 flags=9
Jan 30 10:19:12 beagle /boot/kernel/kernel: ng_sscop_shutdown: 0xc2c94c00 refs=3 flags=9
Note, that the reference count is now 3 as I expected it (and as I
understand your explanation).
The same experiment with two holes and the cpcsinit also works whether I
do it slowly or fast.
NB: the ng_atm node switches the peer hook to queueing.
[later]
If I use 'xl0: lower' instead of the fatm0 it's also ok. Perhaps it is
rather a problem in ng_sscop ???
Can't really understand what happens.
harti
--
harti brandt, http://www.fokus.gmd.de/research/cc/cats/employees/hartmut.brandt/private
brandt@fokus.gmd.de, harti@begemot.org, lhbrandt@mail.ru
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