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bpf: also call skb_postpush_rcsum on xmit occasions 

Follow-up to commit f8ffad69c9 ("bpf: add skb_postpush_rcsum and fix
dev_forward_skb occasions") to fix an issue for dev_queue_xmit() redirect
locations which need CHECKSUM_COMPLETE fixups on ingress.

For the same reasons as described in f8ffad69c9 already, we of course
also need this here, since dev_queue_xmit() on a veth device will let us
end up in the dev_forward_skb() helper again to cross namespaces.

Latter then calls into skb_postpull_rcsum() to pull out L2 header, so
that netif_rx_internal() sees CHECKSUM_COMPLETE as it is expected. That
is, CHECKSUM_COMPLETE on ingress covering L2 _payload_, not L2 headers.

Also here we have to address bpf_redirect() and bpf_clone_redirect().

Fixes: 3896d655f4 ("bpf: introduce bpf_clone_redirect() helper")
Fixes: 27b29f6305 ("bpf: add bpf_redirect() helper")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2016-08-05 00:11:11 +02:00 committed by David S. Miller
parent 66cf3504f4
commit a2bfe6bf09
1 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
net/core/filter.c
View File

@ -1365,6 +1365,12 @@ static inline int bpf_try_make_writable(struct sk_buff *skb,
return err;
}
static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
{
if (skb_at_tc_ingress(skb))
skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
}
static u64 bpf_skb_store_bytes(u64 r1, u64 r2, u64 r3, u64 r4, u64 flags)
{
struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
@ -1607,9 +1613,6 @@ static const struct bpf_func_proto bpf_csum_diff_proto = {
static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
{
if (skb_at_tc_ingress(skb))
skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
return dev_forward_skb(dev, skb);
}
@ -1648,6 +1651,8 @@ static u64 bpf_clone_redirect(u64 r1, u64 ifindex, u64 flags, u64 r4, u64 r5)
if (unlikely(!skb))
return -ENOMEM;
bpf_push_mac_rcsum(skb);
return flags & BPF_F_INGRESS ?
__bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
}
@ -1693,6 +1698,8 @@ int skb_do_redirect(struct sk_buff *skb)
return -EINVAL;
}
bpf_push_mac_rcsum(skb);
return ri->flags & BPF_F_INGRESS ?
__bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
}