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bpf, devmap: Compute proper xdp_frame len redirecting frames 

Even if it is currently forbidden to XDP_REDIRECT a multi-frag xdp_frame into
a devmap, compute proper xdp_frame length in __xdp_enqueue and is_valid_dst
routines running xdp_get_frame_len().

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/894d99c01139e921bdb6868158ff8e67f661c072.1658596075.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi 2022-07-23 19:17:10 +02:00 committed by Daniel Borkmann
parent bbd52178e2
commit bd82ea52f0
1 changed files with 2 additions and 2 deletions
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4
kernel/bpf/devmap.c
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@ -477,7 +477,7 @@ static inline int __xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
if (!dev->netdev_ops->ndo_xdp_xmit) if (!dev->netdev_ops->ndo_xdp_xmit)
return -EOPNOTSUPP; return -EOPNOTSUPP;
err = xdp_ok_fwd_dev(dev, xdpf->len); err = xdp_ok_fwd_dev(dev, xdp_get_frame_len(xdpf));
if (unlikely(err)) if (unlikely(err))
return err; return err;
@ -536,7 +536,7 @@ static bool is_valid_dst(struct bpf_dtab_netdev *obj, struct xdp_frame *xdpf)
!obj->dev->netdev_ops->ndo_xdp_xmit) !obj->dev->netdev_ops->ndo_xdp_xmit)
return false; return false;
if (xdp_ok_fwd_dev(obj->dev, xdpf->len)) if (xdp_ok_fwd_dev(obj->dev, xdp_get_frame_len(xdpf)))
return false; return false;
return true; return true;