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bpf: Fix dev's rx stats for bpf_redirect_peer traffic
Traffic redirected by bpf_redirect_peer() (used by recent CNIs like Cilium)
is not accounted for in the RX stats of supported devices (that is, veth
and netkit), confusing user space metrics collectors such as cAdvisor [0],
as reported by Youlun.
Fix it by calling dev_sw_netstats_rx_add() in skb_do_redirect(), to update
RX traffic counters. Devices that support ndo_get_peer_dev _must_ use the
@tstats per-CPU counters (instead of @lstats, or @dstats).
To make this more fool-proof, error out when ndo_get_peer_dev is set but
@tstats are not selected.
[0] Specifically, the "container_network_receive_{byte,packet}s_total"
counters are affected.
Fixes: 9aa1206e8f
("bpf: Add redirect_peer helper")
Reported-by: Youlun Zhang <zhangyoulun@bytedance.com>
Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>
Co-developed-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://lore.kernel.org/r/20231114004220.6495-6-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
parent
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@ -10055,6 +10055,14 @@ static int netdev_do_alloc_pcpu_stats(struct net_device *dev)
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{
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void __percpu *v;
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/* Drivers implementing ndo_get_peer_dev must support tstat
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* accounting, so that skb_do_redirect() can bump the dev's
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* RX stats upon network namespace switch.
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*/
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if (dev->netdev_ops->ndo_get_peer_dev &&
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dev->pcpu_stat_type != NETDEV_PCPU_STAT_TSTATS)
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return -EOPNOTSUPP;
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switch (dev->pcpu_stat_type) {
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case NETDEV_PCPU_STAT_NONE:
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return 0;
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@ -2492,6 +2492,7 @@ int skb_do_redirect(struct sk_buff *skb)
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net_eq(net, dev_net(dev))))
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goto out_drop;
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skb->dev = dev;
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dev_sw_netstats_rx_add(dev, skb->len);
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return -EAGAIN;
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}
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return flags & BPF_F_NEIGH ?
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