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net: implement XDP_REDIRECT for xdp generic

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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>
This commit is contained in:
John Fastabend 2017-07-17 09:27:50 -07:00 committed by David S. Miller
parent 832622e6bd
commit 6103aa96ec
3 changed files with 47 additions and 2 deletions
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1
include/linux/filter.h
View File

@ -712,6 +712,7 @@ bool bpf_helper_changes_pkt_data(void *func);
struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
const struct bpf_insn *patch, u32 len);
int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb);
int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp);
void bpf_warn_invalid_xdp_action(u32 act);

22
net/core/dev.c
View File

@ -3902,6 +3902,7 @@ static u32 netif_receive_generic_xdp(struct sk_buff *skb,
__skb_push(skb, -off);
switch (act) {
case XDP_REDIRECT:
case XDP_TX:
__skb_push(skb, mac_len);
/* fall through */
@ -3956,14 +3957,27 @@ static int do_xdp_generic(struct sk_buff *skb)
if (xdp_prog) {
u32 act = netif_receive_generic_xdp(skb, xdp_prog);
int err;
if (act != XDP_PASS) {
if (act == XDP_TX)
switch (act) {
case XDP_REDIRECT:
err = xdp_do_generic_redirect(skb->dev, skb);
if (err)
goto out_redir;
/* fallthru to submit skb */
case XDP_TX:
generic_xdp_tx(skb, xdp_prog);
break;
}
return XDP_DROP;
}
}
return XDP_PASS;
out_redir:
trace_xdp_exception(skb->dev, xdp_prog, XDP_REDIRECT);
kfree_skb(skb);
return XDP_DROP;
}
static int netif_rx_internal(struct sk_buff *skb)
@ -3977,8 +3991,12 @@ static int netif_rx_internal(struct sk_buff *skb)
if (static_key_false(&generic_xdp_needed)) {
int ret = do_xdp_generic(skb);
/* Consider XDP consuming the packet a success from
* the netdev point of view we do not want to count
* this as an error.
*/
if (ret != XDP_PASS)
return NET_RX_DROP;
return NET_RX_SUCCESS;
}
#ifdef CONFIG_RPS

26
net/core/filter.c
View File

@ -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);