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net: ppp: reset nextseq counter when enabling SC_MULTILINK 

If using a demand-dialled PPP unit for a PPP multilink master, the pppd
daemon needs to reset the sequence counter between two connections. This
allows the daemon to reuse the PPP unit instead of destroying and recreating
it. As there is no API to reset the counter, this patch resets the counter
whenever the SC_MULTILINK flag is set.

Signed-off-by: Christoph Schulz <develop@kristov.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Schulz 2014-07-15 11:51:03 +02:00 committed by David S. Miller
parent c8ad0f298c
commit d762d03849
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ppp/ppp_generic.c
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@ -661,6 +661,8 @@ static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
break; break;
ppp_lock(ppp); ppp_lock(ppp);
cflags = ppp->flags & ~val; cflags = ppp->flags & ~val;
if (!(ppp->flags & SC_MULTILINK) && (val & SC_MULTILINK))
ppp->nextseq = 0;
ppp->flags = val & SC_FLAG_BITS; ppp->flags = val & SC_FLAG_BITS;
ppp_unlock(ppp); ppp_unlock(ppp);
if (cflags & SC_CCP_OPEN) if (cflags & SC_CCP_OPEN)