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xdp: add trace event for xdp redirect

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This adds a trace event for xdp redirect which may help when debugging
XDP programs that use redirect bpf commands.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend
2017-07-17 09:28:35 -07:00
committed by David S. Miller
parent 6453073987
commit 5acaee0a89
4 changed files with 43 additions and 7 deletions
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13
net/core/filter.c
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@@ -55,6 +55,7 @@
#include <net/sock_reuseport.h>
#include <net/busy_poll.h>
#include <net/tcp.h>
#include <linux/bpf_trace.h>
/**
* sk_filter_trim_cap - run a packet through a socket filter
@@ -2422,18 +2423,22 @@ static int __bpf_tx_xdp(struct net_device *dev, struct xdp_buff *xdp)
return -EOPNOTSUPP;
}
int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp)
int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
struct bpf_prog *xdp_prog)
{
struct redirect_info *ri = this_cpu_ptr(&redirect_info);
struct net_device *fwd;
dev = dev_get_by_index_rcu(dev_net(dev), ri->ifindex);
fwd = dev_get_by_index_rcu(dev_net(dev), ri->ifindex);
ri->ifindex = 0;
if (unlikely(!dev)) {
if (unlikely(!fwd)) {
bpf_warn_invalid_xdp_redirect(ri->ifindex);
return -EINVAL;
}
return __bpf_tx_xdp(dev, xdp);
trace_xdp_redirect(dev, fwd, xdp_prog, XDP_REDIRECT);
return __bpf_tx_xdp(fwd, xdp);
}
EXPORT_SYMBOL_GPL(xdp_do_redirect);