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net: delete stale packet_mclist entries 

When an interface is deleted from a net namespace the ifindex in the
corresponding entries in PF_PACKET sockets' mclists becomes stale.
This can create inconsistencies if later an interface with the same ifindex
is moved from a different namespace (not that unlikely since ifindexes are
per-namespace).
In particular we saw problems with dev->promiscuity, resulting
in "promiscuity touches roof, set promiscuity failed. promiscuity
feature of device might be broken" warnings and EOVERFLOW failures of
setsockopt(PACKET_ADD_MEMBERSHIP).
This patch deletes the mclist entries for interfaces that are deleted.
Since this now causes setsockopt(PACKET_DROP_MEMBERSHIP) to fail with
EADDRNOTAVAIL if called after the interface is deleted, also make
packet_mc_drop not fail.

Signed-off-by: Francesco Ruggeri <fruggeri@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Francesco Ruggeri 2015-03-09 11:51:04 -07:00 committed by David S. Miller
parent 0b2eb3e9bc
commit 82f17091e6
1 changed files with 14 additions and 8 deletions
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24
net/packet/af_packet.c
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@ -3123,11 +3123,18 @@ static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i,
return 0;
}
static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what)
static void packet_dev_mclist_delete(struct net_device *dev,
struct packet_mclist **mlp)
{
for ( ; i; i = i->next) {
if (i->ifindex == dev->ifindex)
packet_dev_mc(dev, i, what);
struct packet_mclist *ml;
while ((ml = *mlp) != NULL) {
if (ml->ifindex == dev->ifindex) {
packet_dev_mc(dev, ml, -1);
*mlp = ml->next;
kfree(ml);
} else
mlp = &ml->next;
}
}
@ -3204,12 +3211,11 @@ static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *mreq)
packet_dev_mc(dev, ml, -1);
kfree(ml);
}
break;
}
}
rtnl_unlock();
return 0;
}
}
rtnl_unlock();
return -EADDRNOTAVAIL;
}
static void packet_flush_mclist(struct sock *sk)
@ -3559,7 +3565,7 @@ static int packet_notifier(struct notifier_block *this,
switch (msg) {
case NETDEV_UNREGISTER:
if (po->mclist)
packet_dev_mclist(dev, po->mclist, -1);
packet_dev_mclist_delete(dev, &po->mclist);
/* fallthrough */
case NETDEV_DOWN: