diff options
| author |   John Fastabend <john.fastabend@gmail.com> | 2017-07-17 09:27:50 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-07-17 09:48:06 -0700 |
| commit | 6103aa96ec077c976e851e0b89cc2446cb76573d (patch) | |
| tree | a54dbc7a88b1737d6f02840ee97eecefef49070b /net/core/filter.c | |
| parent | xdp: sample program for new bpf_redirect helper (diff) | |
| download | linux-dev-6103aa96ec077c976e851e0b89cc2446cb76573d.tar.xz linux-dev-6103aa96ec077c976e851e0b89cc2446cb76573d.zip | |
net: implement XDP_REDIRECT for xdp generic
Add support for redirect to xdp generic creating a fall back for
devices that do not yet have support and allowing test infrastructure
using veth pairs to be built.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Tested-by: Andy Gospodarek <andy@greyhouse.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/filter.c')
| -rw-r--r-- | net/core/filter.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index d606a66d1040..eeb713461c25 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -2437,6 +2437,32 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp) } EXPORT_SYMBOL_GPL(xdp_do_redirect); +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; + + dev = dev_get_by_index_rcu(dev_net(dev), ri->ifindex); + ri->ifindex = 0; + if (unlikely(!dev)) { + bpf_warn_invalid_xdp_redirect(ri->ifindex); + goto err; + } + + if (unlikely(!(dev->flags & IFF_UP))) + goto err; + + len = dev->mtu + dev->hard_header_len + VLAN_HLEN; + if (skb->len > len) + goto err; + + skb->dev = dev; + return 0; +err: + return -EINVAL; +} +EXPORT_SYMBOL_GPL(xdp_do_generic_redirect); + BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) { struct redirect_info *ri = this_cpu_ptr(&redirect_info); |