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net: flow: Add l3mdev flow update

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Add l3mdev hook to set FLOWI_FLAG_SKIP_NH_OIF flag and update oif/iif
in flow struct if its oif or iif points to a device enslaved to an L3
Master device. Only 1 needs to be converted to match the l3mdev FIB
rule. This moves the flow adjustment for l3mdev to a single point
catching all lookups. It is redundant for existing hooks (those are
removed in later patches) but is needed for missed lookups such as
PMTU updates.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
2016-09-10 12:09:52 -07:00
committed by David S. Miller
parent cf9932a941
commit 9ee0034b8f
4 changed files with 47 additions and 0 deletions
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35
net/l3mdev/l3mdev.c
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@@ -222,3 +222,38 @@ out:
return rc;
}
void l3mdev_update_flow(struct net *net, struct flowi *fl)
{
struct net_device *dev;
int ifindex;
rcu_read_lock();
if (fl->flowi_oif) {
dev = dev_get_by_index_rcu(net, fl->flowi_oif);
if (dev) {
ifindex = l3mdev_master_ifindex_rcu(dev);
if (ifindex) {
fl->flowi_oif = ifindex;
fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
goto out;
}
}
}
if (fl->flowi_iif) {
dev = dev_get_by_index_rcu(net, fl->flowi_iif);
if (dev) {
ifindex = l3mdev_master_ifindex_rcu(dev);
if (ifindex) {
fl->flowi_iif = ifindex;
fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
}
}
}
out:
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(l3mdev_update_flow);