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| author | Francesco Ruggeri <fruggeri@arista.com> | 2015-03-09 11:51:04 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-03-09 16:17:43 -0400 |
| commit | 82f17091e68254d1612b42cf23291cad63cfaf04 (patch) | |
| tree | dcffa6fb6b17a6adc0debb924dfcdd855feb0977 /net | |
| parent | 0b2eb3e9bc738c23784b9281dd035ee0b450d98a (diff) | |
| download | linux-82f17091e68254d1612b42cf23291cad63cfaf04.tar.gz linux-82f17091e68254d1612b42cf23291cad63cfaf04.tar.bz2 linux-82f17091e68254d1612b42cf23291cad63cfaf04.zip | |
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/packet/af_packet.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 5bf1e968a728..f8db7064d81c 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -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); } - rtnl_unlock(); - return 0; + break; } } rtnl_unlock(); - return -EADDRNOTAVAIL; + return 0; } 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: |