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authorFlorian Westphal <fw@strlen.de>2017-04-15 19:26:10 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2017-04-19 17:55:16 +0200
commit694a0055f039bc1d73aba10606ea74e798d2d759 (patch)
treed24ef0638fbfbf4dcda30f9fef205912fefc8442 /net/netfilter/nft_ct.c
parentab8bc7ed864b9c4f1fcb00a22bbe4e0f66ce8003 (diff)
netfilter: nft_ct: allow to set ctnetlink event types of a connection
By default the kernel emits all ctnetlink events for a connection. This allows to select the types of events to generate. This can be used to e.g. only send DESTROY events but no NEW/UPDATE ones and will work even if sysctl net.netfilter.nf_conntrack_events is set to 0. This was already possible via iptables' CT target, but the nft version has the advantage that it can also be used with already-established conntracks. The added nf_ct_is_template() check isn't a bug fix as we only support mark and labels (and unlike ecache the conntrack core doesn't copy those). Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_ct.c')
-rw-r--r--net/netfilter/nft_ct.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/net/netfilter/nft_ct.c b/net/netfilter/nft_ct.c
index 6c6fd48b024c..a34ceb38fc55 100644
--- a/net/netfilter/nft_ct.c
+++ b/net/netfilter/nft_ct.c
@@ -264,7 +264,7 @@ static void nft_ct_set_eval(const struct nft_expr *expr,
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
- if (ct == NULL)
+ if (ct == NULL || nf_ct_is_template(ct))
return;
switch (priv->key) {
@@ -284,6 +284,22 @@ static void nft_ct_set_eval(const struct nft_expr *expr,
NF_CT_LABELS_MAX_SIZE / sizeof(u32));
break;
#endif
+#ifdef CONFIG_NF_CONNTRACK_EVENTS
+ case NFT_CT_EVENTMASK: {
+ struct nf_conntrack_ecache *e = nf_ct_ecache_find(ct);
+ u32 ctmask = regs->data[priv->sreg];
+
+ if (e) {
+ if (e->ctmask != ctmask)
+ e->ctmask = ctmask;
+ break;
+ }
+
+ if (ctmask && !nf_ct_is_confirmed(ct))
+ nf_ct_ecache_ext_add(ct, ctmask, 0, GFP_ATOMIC);
+ break;
+ }
+#endif
default:
break;
}
@@ -539,6 +555,13 @@ static int nft_ct_set_init(const struct nft_ctx *ctx,
len = sizeof(u16);
break;
#endif
+#ifdef CONFIG_NF_CONNTRACK_EVENTS
+ case NFT_CT_EVENTMASK:
+ if (tb[NFTA_CT_DIRECTION])
+ return -EINVAL;
+ len = sizeof(u32);
+ break;
+#endif
default:
return -EOPNOTSUPP;
}