Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf

Pablo Neira Ayuso says:

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

This is a large batch of Netfilter fixes for net, they are:

1) Three patches to fix NAT conversion to rhashtable: Switch to rhlist
   structure that allows to have several objects with the same key.
   Moreover, fix wrong comparison logic in nf_nat_bysource_cmp() as this is
   expecting a return value similar to memcmp(). Change location of
   the nat_bysource field in the nf_conn structure to avoid zeroing
   this as it breaks interaction with SLAB_DESTROY_BY_RCU and lead us
   to crashes. From Florian Westphal.

2) Don't allow malformed fragments go through in IPv6, drop them,
   otherwise we hit GPF, patch from Florian Westphal.

3) Fix crash if attributes are missing in nft_range, from Liping Zhang.

4) Fix arptables 32-bits userspace 64-bits kernel compat, from Hongxu Jia.

5) Two patches from David Ahern to fix netfilter interaction with vrf.
   From David Ahern.

6) Fix element timeout calculation in nf_tables, we take milliseconds
   from userspace, but we use jiffies from kernelspace. Patch from
   Anders K.  Pedersen.

7) Missing validation length netlink attribute for nft_hash, from
   Laura Garcia.

8) Fix nf_conntrack_helper documentation, we don't default to off
   anymore for a bit of time so let's get this in sync with the code.

I know is late but I think these are important, specifically the NAT
bits, as they are mostly addressing fallout from recent changes. I also
read there are chances to have -rc8, if that is the case, that would
also give us a bit more time to test this.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 69 insertions, 38 deletions

diff --git a/Documentation/networking/nf_conntrack-sysctl.txt b/Documentation/networking/nf_conntrack-sysctl.txt
index 399e4e866a9c4d..433b6724797ad7 100644
--- a/Documentation/networking/nf_conntrack-sysctl.txt
+++ b/Documentation/networking/nf_conntrack-sysctl.txt
@@ -62,10 +62,13 @@ nf_conntrack_generic_timeout - INTEGER (seconds)
 	protocols.
 
 nf_conntrack_helper - BOOLEAN
-	0 - disabled
-	not 0 - enabled (default)
+	0 - disabled (default)
+	not 0 - enabled
 
 	Enable automatic conntrack helper assignment.
+	If disabled it is required to set up iptables rules to assign
+	helpers to connections.  See the CT target description in the
+	iptables-extensions(8) man page for further information.
 
 nf_conntrack_icmp_timeout - INTEGER (seconds)
 	default 30
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 50418052a520f3..d9d52c020a7099 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -100,6 +100,9 @@ struct nf_conn {
 
 	possible_net_t ct_net;
 
+#if IS_ENABLED(CONFIG_NF_NAT)
+	struct rhlist_head nat_bysource;
+#endif
 	/* all members below initialized via memset */
 	u8 __nfct_init_offset[0];
 
@@ -117,9 +120,6 @@ struct nf_conn {
 	/* Extensions */
 	struct nf_ct_ext *ext;
 
-#if IS_ENABLED(CONFIG_NF_NAT)
-	struct rhash_head	nat_bysource;
-#endif
 	/* Storage reserved for other modules, must be the last member */
 	union nf_conntrack_proto proto;
 };
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index d79d1e9b95461b..b02af0bf577796 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -313,7 +313,7 @@ void nft_unregister_set(struct nft_set_ops *ops);
  * 	@size: maximum set size
  * 	@nelems: number of elements
  * 	@ndeact: number of deactivated elements queued for removal
- * 	@timeout: default timeout value in msecs
+ *	@timeout: default timeout value in jiffies
  * 	@gc_int: garbage collection interval in msecs
  *	@policy: set parameterization (see enum nft_set_policies)
  *	@udlen: user data length
diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
index c3776ff6749f18..b3cc1335adbc1a 100644
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -24,10 +24,11 @@ int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned int addr_t
 	struct flowi4 fl4 = {};
 	__be32 saddr = iph->saddr;
 	__u8 flags = skb->sk ? inet_sk_flowi_flags(skb->sk) : 0;
+	struct net_device *dev = skb_dst(skb)->dev;
 	unsigned int hh_len;
 
 	if (addr_type == RTN_UNSPEC)
-		addr_type = inet_addr_type(net, saddr);
+		addr_type = inet_addr_type_dev_table(net, dev, saddr);
 	if (addr_type == RTN_LOCAL || addr_type == RTN_UNICAST)
 		flags |= FLOWI_FLAG_ANYSRC;
 	else
@@ -40,6 +41,8 @@ int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned int addr_t
 	fl4.saddr = saddr;
 	fl4.flowi4_tos = RT_TOS(iph->tos);
 	fl4.flowi4_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0;
+	if (!fl4.flowi4_oif)
+		fl4.flowi4_oif = l3mdev_master_ifindex(dev);
 	fl4.flowi4_mark = skb->mark;
 	fl4.flowi4_flags = flags;
 	rt = ip_route_output_key(net, &fl4);
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index b31df597fd37e4..697538464e6e31 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1201,8 +1201,8 @@ static int translate_compat_table(struct xt_table_info **pinfo,
 
 	newinfo->number = compatr->num_entries;
 	for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
-		newinfo->hook_entry[i] = info->hook_entry[i];
-		newinfo->underflow[i] = info->underflow[i];
+		newinfo->hook_entry[i] = compatr->hook_entry[i];
+		newinfo->underflow[i] = compatr->underflow[i];
 	}
 	entry1 = newinfo->entries;
 	pos = entry1;
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index e4347aeb2e6533..9948b5ce52dad3 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -576,11 +576,11 @@ int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user)
 	/* Jumbo payload inhibits frag. header */
 	if (ipv6_hdr(skb)->payload_len == 0) {
 		pr_debug("payload len = 0\n");
-		return -EINVAL;
+		return 0;
 	}
 
 	if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0)
-		return -EINVAL;
+		return 0;
 
 	if (!pskb_may_pull(skb, fhoff + sizeof(*fhdr)))
 		return -ENOMEM;
diff --git a/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
index f7aab5ab93a558..f06b0471f39fc0 100644
--- a/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
+++ b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
@@ -69,7 +69,7 @@ static unsigned int ipv6_defrag(void *priv,
 	if (err == -EINPROGRESS)
 		return NF_STOLEN;
 
-	return NF_ACCEPT;
+	return err == 0 ? NF_ACCEPT : NF_DROP;
 }
 
 static struct nf_hook_ops ipv6_defrag_ops[] = {
diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c
index a5400223fd743f..10090400c72f19 100644
--- a/net/ipv6/netfilter/nf_reject_ipv6.c
+++ b/net/ipv6/netfilter/nf_reject_ipv6.c
@@ -156,6 +156,7 @@ void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
 	fl6.daddr = oip6h->saddr;
 	fl6.fl6_sport = otcph->dest;
 	fl6.fl6_dport = otcph->source;
+	fl6.flowi6_oif = l3mdev_master_ifindex(skb_dst(oldskb)->dev);
 	security_skb_classify_flow(oldskb, flowi6_to_flowi(&fl6));
 	dst = ip6_route_output(net, NULL, &fl6);
 	if (dst->error) {
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index bbb8f3df79f723..5b9c884a452e83 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -42,7 +42,7 @@ struct nf_nat_conn_key {
 	const struct nf_conntrack_zone *zone;
 };
 
-static struct rhashtable nf_nat_bysource_table;
+static struct rhltable nf_nat_bysource_table;
 
 inline const struct nf_nat_l3proto *
 __nf_nat_l3proto_find(u8 family)
@@ -193,9 +193,12 @@ static int nf_nat_bysource_cmp(struct rhashtable_compare_arg *arg,
 	const struct nf_nat_conn_key *key = arg->key;
 	const struct nf_conn *ct = obj;
 
-	return same_src(ct, key->tuple) &&
-	       net_eq(nf_ct_net(ct), key->net) &&
-	       nf_ct_zone_equal(ct, key->zone, IP_CT_DIR_ORIGINAL);
+	if (!same_src(ct, key->tuple) ||
+	    !net_eq(nf_ct_net(ct), key->net) ||
+	    !nf_ct_zone_equal(ct, key->zone, IP_CT_DIR_ORIGINAL))
+		return 1;
+
+	return 0;
 }
 
 static struct rhashtable_params nf_nat_bysource_params = {
@@ -204,7 +207,6 @@ static struct rhashtable_params nf_nat_bysource_params = {
 	.obj_cmpfn = nf_nat_bysource_cmp,
 	.nelem_hint = 256,
 	.min_size = 1024,
-	.nulls_base = (1U << RHT_BASE_SHIFT),
 };
 
 /* Only called for SRC manip */
@@ -223,12 +225,15 @@ find_appropriate_src(struct net *net,
 		.tuple = tuple,
 		.zone = zone
 	};
+	struct rhlist_head *hl;
 
-	ct = rhashtable_lookup_fast(&nf_nat_bysource_table, &key,
-				    nf_nat_bysource_params);
-	if (!ct)
+	hl = rhltable_lookup(&nf_nat_bysource_table, &key,
+			     nf_nat_bysource_params);
+	if (!hl)
 		return 0;
 
+	ct = container_of(hl, typeof(*ct), nat_bysource);
+
 	nf_ct_invert_tuplepr(result,
 			     &ct->tuplehash[IP_CT_DIR_REPLY].tuple);
 	result->dst = tuple->dst;
@@ -446,11 +451,17 @@ nf_nat_setup_info(struct nf_conn *ct,
 	}
 
 	if (maniptype == NF_NAT_MANIP_SRC) {
+		struct nf_nat_conn_key key = {
+			.net = nf_ct_net(ct),
+			.tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
+			.zone = nf_ct_zone(ct),
+		};
 		int err;
 
-		err = rhashtable_insert_fast(&nf_nat_bysource_table,
-					     &ct->nat_bysource,
-					     nf_nat_bysource_params);
+		err = rhltable_insert_key(&nf_nat_bysource_table,
+					  &key,
+					  &ct->nat_bysource,
+					  nf_nat_bysource_params);
 		if (err)
 			return NF_DROP;
 	}
@@ -567,8 +578,8 @@ static int nf_nat_proto_clean(struct nf_conn *ct, void *data)
 	 * will delete entry from already-freed table.
 	 */
 	ct->status &= ~IPS_NAT_DONE_MASK;
-	rhashtable_remove_fast(&nf_nat_bysource_table, &ct->nat_bysource,
-			       nf_nat_bysource_params);
+	rhltable_remove(&nf_nat_bysource_table, &ct->nat_bysource,
+			nf_nat_bysource_params);
 
 	/* don't delete conntrack.  Although that would make things a lot
 	 * simpler, we'd end up flushing all conntracks on nat rmmod.
@@ -698,8 +709,8 @@ static void nf_nat_cleanup_conntrack(struct nf_conn *ct)
 	if (!nat)
 		return;
 
-	rhashtable_remove_fast(&nf_nat_bysource_table, &ct->nat_bysource,
-			       nf_nat_bysource_params);
+	rhltable_remove(&nf_nat_bysource_table, &ct->nat_bysource,
+			nf_nat_bysource_params);
 }
 
 static struct nf_ct_ext_type nat_extend __read_mostly = {
@@ -834,13 +845,13 @@ static int __init nf_nat_init(void)
 {
 	int ret;
 
-	ret = rhashtable_init(&nf_nat_bysource_table, &nf_nat_bysource_params);
+	ret = rhltable_init(&nf_nat_bysource_table, &nf_nat_bysource_params);
 	if (ret)
 		return ret;
 
 	ret = nf_ct_extend_register(&nat_extend);
 	if (ret < 0) {
-		rhashtable_destroy(&nf_nat_bysource_table);
+		rhltable_destroy(&nf_nat_bysource_table);
 		printk(KERN_ERR "nf_nat_core: Unable to register extension\n");
 		return ret;
 	}
@@ -864,7 +875,7 @@ static int __init nf_nat_init(void)
 	return 0;
 
  cleanup_extend:
-	rhashtable_destroy(&nf_nat_bysource_table);
+	rhltable_destroy(&nf_nat_bysource_table);
 	nf_ct_extend_unregister(&nat_extend);
 	return ret;
 }
@@ -883,7 +894,7 @@ static void __exit nf_nat_cleanup(void)
 	for (i = 0; i < NFPROTO_NUMPROTO; i++)
 		kfree(nf_nat_l4protos[i]);
 
-	rhashtable_destroy(&nf_nat_bysource_table);
+	rhltable_destroy(&nf_nat_bysource_table);
 }
 
 MODULE_LICENSE("GPL");
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 026581b04ea8d1..e5194f6f906cb2 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2570,7 +2570,8 @@ static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
 	}
 
 	if (set->timeout &&
-	    nla_put_be64(skb, NFTA_SET_TIMEOUT, cpu_to_be64(set->timeout),
+	    nla_put_be64(skb, NFTA_SET_TIMEOUT,
+			 cpu_to_be64(jiffies_to_msecs(set->timeout)),
 			 NFTA_SET_PAD))
 		goto nla_put_failure;
 	if (set->gc_int &&
@@ -2859,7 +2860,8 @@ static int nf_tables_newset(struct net *net, struct sock *nlsk,
 	if (nla[NFTA_SET_TIMEOUT] != NULL) {
 		if (!(flags & NFT_SET_TIMEOUT))
 			return -EINVAL;
-		timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_TIMEOUT]));
+		timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
+						nla[NFTA_SET_TIMEOUT])));
 	}
 	gc_int = 0;
 	if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
@@ -3178,7 +3180,8 @@ static int nf_tables_fill_setelem(struct sk_buff *skb,
 
 	if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
 	    nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
-			 cpu_to_be64(*nft_set_ext_timeout(ext)),
+			 cpu_to_be64(jiffies_to_msecs(
+						*nft_set_ext_timeout(ext))),
 			 NFTA_SET_ELEM_PAD))
 		goto nla_put_failure;
 
@@ -3447,7 +3450,7 @@ void *nft_set_elem_init(const struct nft_set *set,
 		memcpy(nft_set_ext_data(ext), data, set->dlen);
 	if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION))
 		*nft_set_ext_expiration(ext) =
-			jiffies + msecs_to_jiffies(timeout);
+			jiffies + timeout;
 	if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
 		*nft_set_ext_timeout(ext) = timeout;
 
@@ -3535,7 +3538,8 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
 	if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
 		if (!(set->flags & NFT_SET_TIMEOUT))
 			return -EINVAL;
-		timeout = be64_to_cpu(nla_get_be64(nla[NFTA_SET_ELEM_TIMEOUT]));
+		timeout = msecs_to_jiffies(be64_to_cpu(nla_get_be64(
+					nla[NFTA_SET_ELEM_TIMEOUT])));
 	} else if (set->flags & NFT_SET_TIMEOUT) {
 		timeout = set->timeout;
 	}
diff --git a/net/netfilter/nft_hash.c b/net/netfilter/nft_hash.c
index baf694de3935a2..d5447a22275c06 100644
--- a/net/netfilter/nft_hash.c
+++ b/net/netfilter/nft_hash.c
@@ -53,6 +53,7 @@ static int nft_hash_init(const struct nft_ctx *ctx,
 {
 	struct nft_hash *priv = nft_expr_priv(expr);
 	u32 len;
+	int err;
 
 	if (!tb[NFTA_HASH_SREG] ||
 	    !tb[NFTA_HASH_DREG] ||
@@ -67,8 +68,10 @@ static int nft_hash_init(const struct nft_ctx *ctx,
 	priv->sreg = nft_parse_register(tb[NFTA_HASH_SREG]);
 	priv->dreg = nft_parse_register(tb[NFTA_HASH_DREG]);
 
-	len = ntohl(nla_get_be32(tb[NFTA_HASH_LEN]));
-	if (len == 0 || len > U8_MAX)
+	err = nft_parse_u32_check(tb[NFTA_HASH_LEN], U8_MAX, &len);
+	if (err < 0)
+		return err;
+	if (len == 0)
 		return -ERANGE;
 
 	priv->len = len;
diff --git a/net/netfilter/nft_range.c b/net/netfilter/nft_range.c
index fbc88009ca2ef9..8f0aaaea1376eb 100644
--- a/net/netfilter/nft_range.c
+++ b/net/netfilter/nft_range.c
@@ -59,6 +59,12 @@ static int nft_range_init(const struct nft_ctx *ctx, const struct nft_expr *expr
 	int err;
 	u32 op;
 
+	if (!tb[NFTA_RANGE_SREG]      ||
+	    !tb[NFTA_RANGE_OP]	      ||
+	    !tb[NFTA_RANGE_FROM_DATA] ||
+	    !tb[NFTA_RANGE_TO_DATA])
+		return -EINVAL;
+
 	err = nft_data_init(NULL, &priv->data_from, sizeof(priv->data_from),
 			    &desc_from, tb[NFTA_RANGE_FROM_DATA]);
 	if (err < 0)