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authorJohn Fastabend <john.fastabend@gmail.com>2017-10-27 09:45:53 -0700
committerDavid S. Miller <davem@davemloft.net>2017-10-29 11:18:48 +0900
commitbfa640757e9378c2f26867e723f1287e94f5a7ad (patch)
tree927d92a4bf5018b3f82f4943fd9ee6a657c3a4e9 /net/core
parent8108a77515126f6db4374e8593956e20430307c0 (diff)
downloadlinux-bfa640757e9378c2f26867e723f1287e94f5a7ad.tar.bz2
bpf: rename sk_actions to align with bpf infrastructure
Recent additions to support multiple programs in cgroups impose a strict requirement, "all yes is yes, any no is no". To enforce this the infrastructure requires the 'no' return code, SK_DROP in this case, to be 0. To apply these rules to SK_SKB program types the sk_actions return codes need to be adjusted. This fix adds SK_PASS and makes 'SK_DROP = 0'. Finally, remove SK_ABORTED to remove any chance that the API may allow aborted program flows to be passed up the stack. This would be incorrect behavior and allow programs to break existing policies. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/filter.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index 68eaa2f81a8e..6ae94f825f72 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1844,14 +1844,15 @@ BPF_CALL_4(bpf_sk_redirect_map, struct sk_buff *, skb,
{
struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
+ /* If user passes invalid input drop the packet. */
if (unlikely(flags))
- return SK_ABORTED;
+ return SK_DROP;
tcb->bpf.key = key;
tcb->bpf.flags = flags;
tcb->bpf.map = map;
- return SK_REDIRECT;
+ return SK_PASS;
}
struct sock *do_sk_redirect_map(struct sk_buff *skb)