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netfilter: deprecate NF_STOP 

NF_STOP is only used by br_netfilter these days, and it can be emulated
with a combination of NF_STOLEN plus explicit call to the ->okfn()
function as Florian suggests.

To retain binary compatibility with userspace nf_queue application, we
have to keep NF_STOP around, so libnetfilter_queue userspace userspace
applications still work if they use NF_STOP for some exotic reason.

Out of tree modules using NF_STOP would break, but we don't care about
those.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2016-11-03 10:56:17 +01:00
parent 1610a73c41
commit 06fd3a392b
3 changed files with 6 additions and 4 deletions
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2
include/uapi/linux/netfilter.h
View File

@ -13,7 +13,7 @@
#define NF_STOLEN 2
#define NF_QUEUE 3
#define NF_REPEAT 4
#define NF_STOP 5
#define NF_STOP 5 /* Deprecated, for userspace nf_queue compatibility. */
#define NF_MAX_VERDICT NF_STOP
/* we overload the higher bits for encoding auxiliary data such as the queue

6
net/bridge/br_netfilter_hooks.c
View File

@ -845,8 +845,10 @@ static unsigned int ip_sabotage_in(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
if (skb->nf_bridge && !skb->nf_bridge->in_prerouting)
return NF_STOP;
if (skb->nf_bridge && !skb->nf_bridge->in_prerouting) {
state->okfn(state->net, state->sk, skb);
return NF_STOLEN;
}
return NF_ACCEPT;
}

2
net/netfilter/core.c
View File

@ -333,7 +333,7 @@ int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state)
entry = rcu_dereference(state->hook_entries);
next_hook:
verdict = nf_iterate(skb, state, &entry);
if (verdict == NF_ACCEPT || verdict == NF_STOP) {
if (verdict == NF_ACCEPT) {
ret = 1;
} else if ((verdict & NF_VERDICT_MASK) == NF_DROP) {
kfree_skb(skb);