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Douglas Gilbert | 14 May 02:30 2015
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ppp over serial problems in lk 4.0.x

Since lk 4.0.0 came out running ppp connected to a serial
port (GPRS) has failed on my hardware (at91sam9g25 based ARM
system). It works in lk 3.19-rc4 which is the last kernel I
tried prior to lk 4.0.0 . The fix to ppp_generic.c in lk
4.0.2 did not help.

With older kernels I see:

...
chat[1760]: ATD*99***1#^M^M
chat[1760]: CONNECT
chat[1760]:  -- got it
chat[1760]: send (^M)
pppd[1758]: Serial connection established.
pppd[1758]: Using interface ppp0
...

and about 5 ppp related modules loaded including ppp_async.

With lk 4.0.x the "Serial connection established" line never
appears and only the ppp_generic module is loaded.

I get the same results (i.e. depends on the kernel version)
with both an up to date Debian 7 (wheezy) and a freshly
minted Debian 8 (jessie) system.

Doug Gilbert
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(Continue reading)

salix | 5 May 09:54 2015

PPP over PCIe

hi,

I want to send ppp packets generated in linux ppp module over PCIe 
instead of serial port. and then through FPGA send packets out.

I using RIFFA architecture for send and receive data to/from FPGA via 
PCIe, RIFFA has library in user space to communicate with it's driver.
RIFFA site: https://sites.google.com/a/eng.ucsd.edu/matt-jacobsen/riffa
and: http://riffa.ucsd.edu/
also it use IOCTL for communications.
and riffa driver generate /dev/riffa

Is it possible to send PPP packets over any hardware channel?
can anyone give me a point to how can I do this? how can I send ppp 
packets to my PCIe driver?

is it enough to change ppp_generic.c and ppp_channel.h and tty.c?

Best Regards
salix

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Sylvain Rochet | 26 Apr 20:40 2015

[PATCH 0/2] ppp: mppe: fixes MPPE desync on links which don't guarantee packet ordering

I am currently having an issue with PPP over L2TP (UDP) and MPPE in
stateless mode (default mode), UDP does not guarantee packet ordering so
we might get out of order packet. MPPE needs to be continuously synched
so we should drop late UDP packet.

I added a printk on the number of time we rekeyed in MPPE decompressor,
this is what we currently have if we receive a slightly out of order UDP
packet:

[1731001.049206] mppe_decompress[1]: ccount 1559
[1731001.049216] mppe_decompress[1]: rekeyed 1 times

[1731001.049228] mppe_decompress[1]: ccount 1560
[1731001.049232] mppe_decompress[1]: rekeyed 1 times

[1731001.050170] mppe_decompress[1]: ccount 1562
[1731001.050182] mppe_decompress[1]: rekeyed 2 times

[1731001.050191] mppe_decompress[1]: ccount 1561
[1731001.062576] mppe_decompress[1]: rekeyed 4095 times
                                             ^^^^
This is obviously wrong, we missed packet 1561 and we already rekeyed 2
times for 1562 we previously received, we can't recover the decryption
key we need for 1561, we should drop it instead of rekeying 4095 times.

This patch series drop any packet with are not within the 4096/2 forward
window.

Sylvain Rochet (2):
  ppp: mppe: sanity error path rework
(Continue reading)

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ck | 27 Mar 22:42 2015
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PADO answer incoming wrong VLAN since new linecard

Hi There!
I've been running pppd for years with my PPPoE connection. That was 
working perfectly fine until yesterday.
I am not able to connect via PPPoE anymore, because after I am sending 
an PADI, the received PADO is incoming on a wrong VLAN.

That happend, after the linecard outside has been changed by my ISP. It 
was an Infineon 11.5.3, when it was working and stopped working, after 
it has been changed to a Broadcom 164.34.

Basically, my setup is, that I've to connect via vlan7. I am sending my 
requests on that specific vlan7. But now, after that, I am getting the 
PADO on vlan8, which now causes the problem, that pppd thinks, that 
there is no answer to the PADI request.

That also seems not to be a distribution problem. I am using Gentoo, but 
I've tried also Ubuntu and OpenSUSE. All distributions showed the same 
error. I've tried pppd 2.4.5, 2.4.6 and 2.4.7.

BUT!
If I am using a BSD-Distribution (like pfSense) or an external hardware 
router (like Fritz!Box), those are perfectly working fine. Those systems 
can connect via PPPoE, the PADO answer is getting there on the correct 
VLAN back (7).

So, what is going? Why does Linux PPP seems to have problems, where 
other systems do not have a problem?
Can anybody help? After my tests, I am just thinking, that there is some 
sort if a bug.. I mean, if was working for years fine and now stopped?

(Continue reading)

pepa6.es@ono.com | 12 Mar 12:49 2015

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Steel Company Limited
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Liaoning 114021, China.

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Simon Farnsworth | 1 Mar 11:54 2015
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[PATCH net-next v2] pppoe: Use workqueue to die properly when a PADT is received

When a PADT frame is received, the socket may not be in a good state to
close down the PPP interface. The current implementation handles this by
simply blocking all further PPP traffic, and hoping that the lack of traffic
will trigger the user to investigate.

Use schedule_work to get to a process context from which we clear down the
PPP interface, in a fashion analogous to hangup on a TTY-based PPP
interface. This causes pppd to disconnect immediately, and allows tools to
take immediate corrective action.

Note that pppd's rp_pppoe.so plugin has code in it to disable the session
when it disconnects; however, as a consequence of this patch, the session is
already disabled before rp_pppoe.so is asked to disable the session. The
result is a harmless error message:

Failed to disconnect PPPoE socket: 114 Operation already in progress

This message is safe to ignore, as long as the error is 114 Operation
already in progress; in that specific case, it means that the PPPoE session
has already been disabled before pppd tried to disable it.

Signed-off-by: Simon Farnsworth <simon <at> farnz.org.uk>
Tested-by: Dan Williams <dcbw <at> redhat.com>
Tested-by: Christoph Schulz <develop <at> kristov.de>
---

Changes from v1:

 * Amend commit message to tell people about the harmless error from pppd

(Continue reading)

Alan | 19 Feb 22:39 2015
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[PATCH] ppp_synctty: remove unneeded NULL check

Fix a random whine found by coverity. Had it been NULL it would have
showered us with oopses long before.

Signed-off-by: Alan Cox <alan <at> linux.intel.com>
---
 drivers/net/ppp/ppp_synctty.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ppp/ppp_synctty.c b/drivers/net/ppp/ppp_synctty.c
index 925d3e2..b5592b8 100644
--- a/drivers/net/ppp/ppp_synctty.c
+++ b/drivers/net/ppp/ppp_synctty.c
 <at>  <at>  -549,7 +549,7  <at>  <at>  ppp_sync_txmunge(struct syncppp *ap, struct sk_buff *skb)

 	ap->last_xmit = jiffies;

-	if (skb && ap->flags & SC_LOG_OUTPKT)
+	if (ap->flags & SC_LOG_OUTPKT)
 		ppp_print_buffer ("send buffer", skb->data, skb->len);

 	return skb;

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Anljaken . | 10 Feb 13:02 2015
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Default Route Problem with pppd

Hi,

I have a default route problem with a dialup xDSL ppp interface. Even
if i give defaultroute option to pppd service, default route is not
added. I do not have another default route. Running on debug mode, i
can not see any problem at logs.

PPP Version : ppp-2.4.4-2.el5
OS : Centos5
Linux kernel : 3.4.103-2
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