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net/sched: act_mirred: use the backlog for mirred ingress

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The test Davide added in commit ca22da2fbd69 ("act_mirred: use the backlog
for nested calls to mirred ingress") hangs our testing VMs every 10 or so
runs, with the familiar tcp_v4_rcv -> tcp_v4_rcv deadlock reported by
lockdep.

The problem as previously described by Davide (see Link) is that
if we reverse flow of traffic with the redirect (egress -> ingress)
we may reach the same socket which generated the packet. And we may
still be holding its socket lock. The common solution to such deadlocks
is to put the packet in the Rx backlog, rather than run the Rx path
inline. Do that for all egress -> ingress reversals, not just once
we started to nest mirred calls.

In the past there was a concern that the backlog indirection will
lead to loss of error reporting / less accurate stats. But the current
workaround does not seem to address the issue.

Fixes: 53592b364001 ("net/sched: act_mirred: Implement ingress actions")
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Suggested-by: Davide Caratti <dcaratti@redhat.com>
Link: https://lore.kernel.org/netdev/33dc43f587ec1388ba456b4915c75f02a8aae226.1663945716.git.dcaratti@redhat.com/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2024-02-15 06:33:45 -08:00 committed by David S. Miller
parent a9f80df4f5
commit 52f671db18
2 changed files with 5 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
net/sched/act_mirred.c
View File

@ -232,18 +232,14 @@ release_idr:
return err;
}
static bool is_mirred_nested(void)
{
return unlikely(__this_cpu_read(mirred_nest_level) > 1);
}
static int tcf_mirred_forward(bool want_ingress, struct sk_buff *skb)
static int
tcf_mirred_forward(bool at_ingress, bool want_ingress, struct sk_buff *skb)
{
int err;
if (!want_ingress)
err = tcf_dev_queue_xmit(skb, dev_queue_xmit);
else if (is_mirred_nested())
else if (!at_ingress)
err = netif_rx(skb);
else
err = netif_receive_skb(skb);
@ -319,9 +315,9 @@ static int tcf_mirred_to_dev(struct sk_buff *skb, struct tcf_mirred *m,
skb_set_redirected(skb_to_send, skb_to_send->tc_at_ingress);
err = tcf_mirred_forward(want_ingress, skb_to_send);
err = tcf_mirred_forward(at_ingress, want_ingress, skb_to_send);
} else {
err = tcf_mirred_forward(want_ingress, skb_to_send);
err = tcf_mirred_forward(at_ingress, want_ingress, skb_to_send);
}
if (err) {

3
tools/testing/selftests/net/forwarding/tc_actions.sh
View File

@ -235,9 +235,6 @@ mirred_egress_to_ingress_tcp_test()
check_err $? "didn't mirred redirect ICMP"
tc_check_packets "dev $h1 ingress" 102 10
check_err $? "didn't drop mirred ICMP"
local overlimits=$(tc_rule_stats_get ${h1} 101 egress .overlimits)
test ${overlimits} = 10
check_err $? "wrong overlimits, expected 10 got ${overlimits}"
tc filter del dev $h1 egress protocol ip pref 100 handle 100 flower
tc filter del dev $h1 egress protocol ip pref 101 handle 101 flower