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bpf: fix the printing of ifindex

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Save the ifindex before it gets zeroed so the invalid
ifindex can be printed out.

Signed-off-by: William Tu <u9012063@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu 2017-08-02 08:43:52 -07:00 committed by David S. Miller
parent f6c00a3bb8
commit eb48d68281
1 changed files with 6 additions and 4 deletions
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10
net/core/filter.c
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@ -2509,15 +2509,16 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
{
struct redirect_info *ri = this_cpu_ptr(&redirect_info);
struct net_device *fwd;
u32 index = ri->ifindex;
if (ri->map)
return xdp_do_redirect_map(dev, xdp, xdp_prog);
fwd = dev_get_by_index_rcu(dev_net(dev), ri->ifindex);
fwd = dev_get_by_index_rcu(dev_net(dev), index);
ri->ifindex = 0;
ri->map = NULL;
if (unlikely(!fwd)) {
bpf_warn_invalid_xdp_redirect(ri->ifindex);
bpf_warn_invalid_xdp_redirect(index);
return -EINVAL;
}
@ -2531,11 +2532,12 @@ int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb)
{
struct redirect_info *ri = this_cpu_ptr(&redirect_info);
unsigned int len;
u32 index = ri->ifindex;
dev = dev_get_by_index_rcu(dev_net(dev), ri->ifindex);
dev = dev_get_by_index_rcu(dev_net(dev), index);
ri->ifindex = 0;
if (unlikely(!dev)) {
bpf_warn_invalid_xdp_redirect(ri->ifindex);
bpf_warn_invalid_xdp_redirect(index);
goto err;
}