netfilter: allow hooks to pass error code back up the stack
SELinux would like to pass certain fatal errors back up the stack. This patch
implements the generic netfilter support for this functionality.
Based-on-patch-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 85dabb8..32fcbe2 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -173,9 +173,11 @@
outdev, &elem, okfn, hook_thresh);
if (verdict == NF_ACCEPT || verdict == NF_STOP) {
ret = 1;
- } else if (verdict == NF_DROP) {
+ } else if ((verdict & NF_VERDICT_MASK) == NF_DROP) {
kfree_skb(skb);
- ret = -EPERM;
+ ret = -(verdict >> NF_VERDICT_BITS);
+ if (ret == 0)
+ ret = -EPERM;
} else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE) {
if (!nf_queue(skb, elem, pf, hook, indev, outdev, okfn,
verdict >> NF_VERDICT_BITS))