Merge branch 'main' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf

Pablo Neira Ayuso says:

====================
Netfilter fixes for net

The following patchset contains Netfilter fixes for net:

1) Restore ctnetlink zero mark in events and dump, from Ivan Delalande.

2) Fix deadlock due to missing disabled bh in tproxy, from Florian Westphal.

3) Safer maximum chain load in conntrack, from Eric Dumazet.

* 'main' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf:
netfilter: conntrack: adopt safer max chain length
netfilter: tproxy: fix deadlock due to missing BH disable
netfilter: ctnetlink: revert to dumping mark regardless of event type
====================

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Paolo Abeni <[e-mail]>

include/net/netfilter/nf_tproxy.h

···
 	return false;
 }
 
+static inline void nf_tproxy_twsk_deschedule_put(struct inet_timewait_sock *tw)
+{
+	local_bh_disable();
+	inet_twsk_deschedule_put(tw);
+	local_bh_enable();
+}
+
 /* assign a socket to the skb -- consumes sk */
 static inline void nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
 {

net/ipv4/netfilter/nf_tproxy_ipv4.c

···
 					    hp->source, lport ? lport : hp->dest,
 					    skb->dev, NF_TPROXY_LOOKUP_LISTENER);
 		if (sk2) {
-			inet_twsk_deschedule_put(inet_twsk(sk));
+			nf_tproxy_twsk_deschedule_put(inet_twsk(sk));
 			sk = sk2;
 		}
 	}

net/ipv6/netfilter/nf_tproxy_ipv6.c

···
 					    lport ? lport : hp->dest,
 					    skb->dev, NF_TPROXY_LOOKUP_LISTENER);
 		if (sk2) {
-			inet_twsk_deschedule_put(inet_twsk(sk));
+			nf_tproxy_twsk_deschedule_put(inet_twsk(sk));
 			sk = sk2;
 		}
 	}

net/netfilter/nf_conntrack_core.c

···
 #define GC_SCAN_MAX_DURATION	msecs_to_jiffies(10)
 #define GC_SCAN_EXPIRED_MAX	(64000u / HZ)
 
-#define MIN_CHAINLEN	8u
-#define MAX_CHAINLEN	(32u - MIN_CHAINLEN)
+#define MIN_CHAINLEN	50u
+#define MAX_CHAINLEN	(80u - MIN_CHAINLEN)
 
 static struct conntrack_gc_work conntrack_gc_work;
 

net/netfilter/nf_conntrack_netlink.c

···
 }
 
 #ifdef CONFIG_NF_CONNTRACK_MARK
-static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
+static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct,
+			       bool dump)
 {
 	u32 mark = READ_ONCE(ct->mark);
 
-	if (!mark)
+	if (!mark && !dump)
 		return 0;
 
 	if (nla_put_be32(skb, CTA_MARK, htonl(mark)))
···
 	return -1;
 }
 #else
-#define ctnetlink_dump_mark(a, b) (0)
+#define ctnetlink_dump_mark(a, b, c) (0)
 #endif
 
 #ifdef CONFIG_NF_CONNTRACK_SECMARK
···
 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
 {
 	if (ctnetlink_dump_status(skb, ct) < 0 ||
-	    ctnetlink_dump_mark(skb, ct) < 0 ||
+	    ctnetlink_dump_mark(skb, ct, true) < 0 ||
 	    ctnetlink_dump_secctx(skb, ct) < 0 ||
 	    ctnetlink_dump_id(skb, ct) < 0 ||
 	    ctnetlink_dump_use(skb, ct) < 0 ||
···
 	}
 
 #ifdef CONFIG_NF_CONNTRACK_MARK
-	if (events & (1 << IPCT_MARK) &&
-	    ctnetlink_dump_mark(skb, ct) < 0)
+	if (ctnetlink_dump_mark(skb, ct, events & (1 << IPCT_MARK)))
 		goto nla_put_failure;
 #endif
 	nlmsg_end(skb, nlh);
···
 		goto nla_put_failure;
 
 #ifdef CONFIG_NF_CONNTRACK_MARK
-	if (ctnetlink_dump_mark(skb, ct) < 0)
+	if (ctnetlink_dump_mark(skb, ct, true) < 0)
 		goto nla_put_failure;
 #endif
 	if (ctnetlink_dump_labels(skb, ct) < 0)