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| author | Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> | 2018-07-06 05:49:00 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-07-08 01:25:35 +0300 |
| commit | d8d7218ad842e18fc6976b87c08ed749e8d56313 (patch) | |
| tree | 57cdc7f8d2c55996b0ca1b6e74a8de8fa997b29f /kernel/bpf/devmap.c | |
| parent | 4fb126cbcbd6870851f0b3ba503e8ec0e66b9dd5 (diff) | |
| download | linux-d8d7218ad842e18fc6976b87c08ed749e8d56313.tar.xz | |
xdp: XDP_REDIRECT should check IFF_UP and MTU
Otherwise we end up with attempting to send packets from down devices
or to send oversized packets, which may cause unexpected driver/device
behaviour. Generic XDP has already done this check, so reuse the logic
in native XDP.
Fixes: 814abfabef3c ("xdp: add bpf_redirect helper function")
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/devmap.c')
| -rw-r--r-- | kernel/bpf/devmap.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 642c97f6d1b8..d361fc1e3bf3 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -334,10 +334,15 @@ int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, { struct net_device *dev = dst->dev; struct xdp_frame *xdpf; + int err; if (!dev->netdev_ops->ndo_xdp_xmit) return -EOPNOTSUPP; + err = xdp_ok_fwd_dev(dev, xdp->data_end - xdp->data); + if (unlikely(err)) + return err; + xdpf = convert_to_xdp_frame(xdp); if (unlikely(!xdpf)) return -EOVERFLOW; @@ -350,7 +355,7 @@ int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb, { int err; - err = __xdp_generic_ok_fwd_dev(skb, dst->dev); + err = xdp_ok_fwd_dev(dst->dev, skb->len); if (unlikely(err)) return err; skb->dev = dst->dev; |