act_mirred: do not drop packets when fails to mirror it
We drop packet unconditionally when we fail to mirror it. This is not intended in some cases. Consdier for kvm guest, we may mirror the traffic of the bridge to a tap device used by a VM. When kernel fails to mirror the packet in conditions such as when qemu crashes or stop polling the tap, it's hard for the management software to detect such condition and clean the the mirroring before. This would lead all packets to the bridge to be dropped and break the netowrk of other virtual machines. To solve the issue, the patch does not drop packets when kernel fails to mirror it, and only drop the redirected packets. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -200,13 +200,12 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
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out:
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if (err) {
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m->tcf_qstats.overlimits++;
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/* should we be asking for packet to be dropped?
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* may make sense for redirect case only
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*/
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retval = TC_ACT_SHOT;
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} else {
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if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
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retval = TC_ACT_SHOT;
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else
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retval = m->tcf_action;
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} else
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retval = m->tcf_action;
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}
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spin_unlock(&m->tcf_lock);
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return retval;
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