[PATCH 0/3] ipset patches for nf

[PATCH 0/3] ipset patches for nf

[Jozsef Kadlecsik]

Hi Pablo,

Please pull the next ipset patches for the nf tree:

- Fix the error code in ip_set_sockfn_get() when copy_to_user() is used,
  from Dan Carpenter.
- The IPv6 part was missed when fixing copying the right MAC address
  in the patch "netfilter: ipset: Copy the right MAC address in bitmap:ip,mac
  and hash:ip,mac sets", it is completed now by Stefano Brivio.
- ipset nla_policies are fixed to fully support NL_VALIDATE_STRICT and
  the code is converted from deprecated parsings to verified ones.

Best regards,
Jozsef

The following changes since commit 3da09663209d6732c74cb7b6d5890b8dea9cf6f3:

  Merge branch 'hv_netvsc-fix-error-handling-in-netvsc_attach-set_features' (2019-10-30 18:17:36 -0700)

are available in the Git repository at:

  it://blackhole.kfki.hu/nf e2eaf4585997c8576d

for you to fetch changes up to e2eaf4585997c8576d28b2028d7a937c9c710011:

  netfilter: ipset: Fix nla_policies to fully support NL_VALIDATE_STRICT (2019-11-01 17:13:18 +0100)

----------------------------------------------------------------
Dan Carpenter (1):
      netfilter: ipset: Fix an error code in ip_set_sockfn_get()

Jozsef Kadlecsik (1):
      netfilter: ipset: Fix nla_policies to fully support NL_VALIDATE_STRICT

Stefano Brivio (1):
      netfilter: ipset: Copy the right MAC address in hash:ip,mac IPv6 sets

 net/netfilter/ipset/ip_set_core.c        | 49 +++++++++++++++++++++-----------
 net/netfilter/ipset/ip_set_hash_ipmac.c  |  2 +-
 net/netfilter/ipset/ip_set_hash_net.c    |  1 +
 net/netfilter/ipset/ip_set_hash_netnet.c |  1 +
 4 files changed, 36 insertions(+), 17 deletions(-)

[PATCH 1/3] netfilter: ipset: Fix an error code in ip_set_sockfn_get()

[Jozsef Kadlecsik]

From: Dan Carpenter <dan.carpenter@oracle.com>

The copy_to_user() function returns the number of bytes remaining to be
copied.  In this code, that positive return is checked at the end of the
function and we return zero/success.  What we should do instead is
return -EFAULT.

Fixes: a7b4f989a629 ("netfilter: ipset: IP set core support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
---
 net/netfilter/ipset/ip_set_core.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index e64d5f9a89dd..e7288eab7512 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -2069,8 +2069,9 @@ ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
 		}
 
 		req_version->version = IPSET_PROTOCOL;
-		ret = copy_to_user(user, req_version,
-				   sizeof(struct ip_set_req_version));
+		if (copy_to_user(user, req_version,
+				 sizeof(struct ip_set_req_version)))
+			ret = -EFAULT;
 		goto done;
 	}
 	case IP_SET_OP_GET_BYNAME: {
@@ -2129,7 +2130,8 @@ ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
 	}	/* end of switch(op) */
 
 copy:
-	ret = copy_to_user(user, data, copylen);
+	if (copy_to_user(user, data, copylen))
+		ret = -EFAULT;
 
 done:
 	vfree(data);
-- 
2.20.1

[PATCH 2/3] netfilter: ipset: Copy the right MAC address in hash:ip,mac IPv6 sets

[Jozsef Kadlecsik]

From: Stefano Brivio <sbrivio@redhat.com>

Same as commit 1b4a75108d5b ("netfilter: ipset: Copy the right MAC
address in bitmap:ip,mac and hash:ip,mac sets"), another copy and paste
went wrong in commit 8cc4ccf58379 ("netfilter: ipset: Allow matching on
destination MAC address for mac and ipmac sets").

When I fixed this for IPv4 in 1b4a75108d5b, I didn't realise that
hash:ip,mac sets also support IPv6 as family, and this is covered by a
separate function, hash_ipmac6_kadt().

In hash:ip,mac sets, the first dimension is the IP address, and the
second dimension is the MAC address: check the IPSET_DIM_TWO_SRC flag
in flags while deciding which MAC address to copy, destination or
source.

This way, mixing source and destination matches for the two dimensions
of ip,mac hash type works as expected, also for IPv6. With this setup:

  ip netns add A
  ip link add veth1 type veth peer name veth2 netns A
  ip addr add 2001:db8::1/64 dev veth1
  ip -net A addr add 2001:db8::2/64 dev veth2
  ip link set veth1 up
  ip -net A link set veth2 up

  dst=$(ip netns exec A cat /sys/class/net/veth2/address)

  ip netns exec A ipset create test_hash hash:ip,mac family inet6
  ip netns exec A ipset add test_hash 2001:db8::1,${dst}
  ip netns exec A ip6tables -A INPUT -p icmpv6 --icmpv6-type 135 -j ACCEPT
  ip netns exec A ip6tables -A INPUT -m set ! --match-set test_hash src,dst -j DROP

ipset now correctly matches a test packet:

  # ping -c1 2001:db8::2 >/dev/null
  # echo $?
  0

Reported-by: Chen, Yi <yiche@redhat.com>
Fixes: 8cc4ccf58379 ("netfilter: ipset: Allow matching on destination MAC address for mac and ipmac sets")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
---
 net/netfilter/ipset/ip_set_hash_ipmac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/ipset/ip_set_hash_ipmac.c b/net/netfilter/ipset/ip_set_hash_ipmac.c
index 24d8f4df4230..4ce563eb927d 100644
--- a/net/netfilter/ipset/ip_set_hash_ipmac.c
+++ b/net/netfilter/ipset/ip_set_hash_ipmac.c
@@ -209,7 +209,7 @@ hash_ipmac6_kadt(struct ip_set *set, const struct sk_buff *skb,
 	    (skb_mac_header(skb) + ETH_HLEN) > skb->data)
 		return -EINVAL;
 
-	if (opt->flags & IPSET_DIM_ONE_SRC)
+	if (opt->flags & IPSET_DIM_TWO_SRC)
 		ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
 	else
 		ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
-- 
2.20.1

[PATCH 3/3] netfilter: ipset: Fix nla_policies to fully support NL_VALIDATE_STRICT

[Jozsef Kadlecsik]

Since v5.2 (commit "netlink: re-add parse/validate functions in strict
mode") NL_VALIDATE_STRICT is enabled. Fix the ipset nla_policies which did
not support strict mode and convert from deprecated parsings to verified ones.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
---
 net/netfilter/ipset/ip_set_core.c        | 41 ++++++++++++++++--------
 net/netfilter/ipset/ip_set_hash_net.c    |  1 +
 net/netfilter/ipset/ip_set_hash_netnet.c |  1 +
 3 files changed, 30 insertions(+), 13 deletions(-)

diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index e7288eab7512..d73d1828216a 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -296,7 +296,8 @@ ip_set_get_ipaddr4(struct nlattr *nla,  __be32 *ipaddr)
 
 	if (unlikely(!flag_nested(nla)))
 		return -IPSET_ERR_PROTOCOL;
-	if (nla_parse_nested_deprecated(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy, NULL))
+	if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla,
+			     ipaddr_policy, NULL))
 		return -IPSET_ERR_PROTOCOL;
 	if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV4)))
 		return -IPSET_ERR_PROTOCOL;
@@ -314,7 +315,8 @@ ip_set_get_ipaddr6(struct nlattr *nla, union nf_inet_addr *ipaddr)
 	if (unlikely(!flag_nested(nla)))
 		return -IPSET_ERR_PROTOCOL;
 
-	if (nla_parse_nested_deprecated(tb, IPSET_ATTR_IPADDR_MAX, nla, ipaddr_policy, NULL))
+	if (nla_parse_nested(tb, IPSET_ATTR_IPADDR_MAX, nla,
+			     ipaddr_policy, NULL))
 		return -IPSET_ERR_PROTOCOL;
 	if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_IPADDR_IPV6)))
 		return -IPSET_ERR_PROTOCOL;
@@ -934,7 +936,8 @@ static int ip_set_create(struct net *net, struct sock *ctnl,
 
 	/* Without holding any locks, create private part. */
 	if (attr[IPSET_ATTR_DATA] &&
-	    nla_parse_nested_deprecated(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA], set->type->create_policy, NULL)) {
+	    nla_parse_nested(tb, IPSET_ATTR_CREATE_MAX, attr[IPSET_ATTR_DATA],
+			     set->type->create_policy, NULL)) {
 		ret = -IPSET_ERR_PROTOCOL;
 		goto put_out;
 	}
@@ -1281,6 +1284,14 @@ dump_attrs(struct nlmsghdr *nlh)
 	}
 }
 
+static const struct nla_policy
+ip_set_dump_policy[IPSET_ATTR_CMD_MAX + 1] = {
+	[IPSET_ATTR_PROTOCOL]	= { .type = NLA_U8 },
+	[IPSET_ATTR_SETNAME]	= { .type = NLA_NUL_STRING,
+				    .len = IPSET_MAXNAMELEN - 1 },
+	[IPSET_ATTR_FLAGS]	= { .type = NLA_U32 },
+};
+
 static int
 dump_init(struct netlink_callback *cb, struct ip_set_net *inst)
 {
@@ -1292,9 +1303,9 @@ dump_init(struct netlink_callback *cb, struct ip_set_net *inst)
 	ip_set_id_t index;
 	int ret;
 
-	ret = nla_parse_deprecated(cda, IPSET_ATTR_CMD_MAX, attr,
-				   nlh->nlmsg_len - min_len,
-				   ip_set_setname_policy, NULL);
+	ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, attr,
+			nlh->nlmsg_len - min_len,
+			ip_set_dump_policy, NULL);
 	if (ret)
 		return ret;
 
@@ -1543,9 +1554,9 @@ call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set,
 		memcpy(&errmsg->msg, nlh, nlh->nlmsg_len);
 		cmdattr = (void *)&errmsg->msg + min_len;
 
-		ret = nla_parse_deprecated(cda, IPSET_ATTR_CMD_MAX, cmdattr,
-					   nlh->nlmsg_len - min_len,
-					   ip_set_adt_policy, NULL);
+		ret = nla_parse(cda, IPSET_ATTR_CMD_MAX, cmdattr,
+				nlh->nlmsg_len - min_len, ip_set_adt_policy,
+				NULL);
 
 		if (ret) {
 			nlmsg_free(skb2);
@@ -1596,7 +1607,9 @@ static int ip_set_ad(struct net *net, struct sock *ctnl,
 
 	use_lineno = !!attr[IPSET_ATTR_LINENO];
 	if (attr[IPSET_ATTR_DATA]) {
-		if (nla_parse_nested_deprecated(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], set->type->adt_policy, NULL))
+		if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX,
+				     attr[IPSET_ATTR_DATA],
+				     set->type->adt_policy, NULL))
 			return -IPSET_ERR_PROTOCOL;
 		ret = call_ad(ctnl, skb, set, tb, adt, flags,
 			      use_lineno);
@@ -1606,7 +1619,8 @@ static int ip_set_ad(struct net *net, struct sock *ctnl,
 		nla_for_each_nested(nla, attr[IPSET_ATTR_ADT], nla_rem) {
 			if (nla_type(nla) != IPSET_ATTR_DATA ||
 			    !flag_nested(nla) ||
-			    nla_parse_nested_deprecated(tb, IPSET_ATTR_ADT_MAX, nla, set->type->adt_policy, NULL))
+			    nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, nla,
+					     set->type->adt_policy, NULL))
 				return -IPSET_ERR_PROTOCOL;
 			ret = call_ad(ctnl, skb, set, tb, adt,
 				      flags, use_lineno);
@@ -1655,7 +1669,8 @@ static int ip_set_utest(struct net *net, struct sock *ctnl, struct sk_buff *skb,
 	if (!set)
 		return -ENOENT;
 
-	if (nla_parse_nested_deprecated(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA], set->type->adt_policy, NULL))
+	if (nla_parse_nested(tb, IPSET_ATTR_ADT_MAX, attr[IPSET_ATTR_DATA],
+			     set->type->adt_policy, NULL))
 		return -IPSET_ERR_PROTOCOL;
 
 	rcu_read_lock_bh();
@@ -1961,7 +1976,7 @@ static const struct nfnl_callback ip_set_netlink_subsys_cb[IPSET_MSG_MAX] = {
 	[IPSET_CMD_LIST]	= {
 		.call		= ip_set_dump,
 		.attr_count	= IPSET_ATTR_CMD_MAX,
-		.policy		= ip_set_setname_policy,
+		.policy		= ip_set_dump_policy,
 	},
 	[IPSET_CMD_SAVE]	= {
 		.call		= ip_set_dump,
diff --git a/net/netfilter/ipset/ip_set_hash_net.c b/net/netfilter/ipset/ip_set_hash_net.c
index c259cbc3ef45..3d932de0ad29 100644
--- a/net/netfilter/ipset/ip_set_hash_net.c
+++ b/net/netfilter/ipset/ip_set_hash_net.c
@@ -368,6 +368,7 @@ static struct ip_set_type hash_net_type __read_mostly = {
 		[IPSET_ATTR_IP_TO]	= { .type = NLA_NESTED },
 		[IPSET_ATTR_CIDR]	= { .type = NLA_U8 },
 		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
+		[IPSET_ATTR_LINENO]	= { .type = NLA_U32 },
 		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
 		[IPSET_ATTR_BYTES]	= { .type = NLA_U64 },
 		[IPSET_ATTR_PACKETS]	= { .type = NLA_U64 },
diff --git a/net/netfilter/ipset/ip_set_hash_netnet.c b/net/netfilter/ipset/ip_set_hash_netnet.c
index a3ae69bfee66..4398322fad59 100644
--- a/net/netfilter/ipset/ip_set_hash_netnet.c
+++ b/net/netfilter/ipset/ip_set_hash_netnet.c
@@ -476,6 +476,7 @@ static struct ip_set_type hash_netnet_type __read_mostly = {
 		[IPSET_ATTR_CIDR]	= { .type = NLA_U8 },
 		[IPSET_ATTR_CIDR2]	= { .type = NLA_U8 },
 		[IPSET_ATTR_TIMEOUT]	= { .type = NLA_U32 },
+		[IPSET_ATTR_LINENO]	= { .type = NLA_U32 },
 		[IPSET_ATTR_CADT_FLAGS]	= { .type = NLA_U32 },
 		[IPSET_ATTR_BYTES]	= { .type = NLA_U64 },
 		[IPSET_ATTR_PACKETS]	= { .type = NLA_U64 },
-- 
2.20.1

Re: [PATCH 0/3] ipset patches for nf

[Pablo Neira Ayuso]

On Fri, Nov 01, 2019 at 05:35:51PM +0100, Jozsef Kadlecsik wrote:
> Hi Pablo,
> 
> Please pull the next ipset patches for the nf tree:
> 
> - Fix the error code in ip_set_sockfn_get() when copy_to_user() is used,
>   from Dan Carpenter.
> - The IPv6 part was missed when fixing copying the right MAC address
>   in the patch "netfilter: ipset: Copy the right MAC address in bitmap:ip,mac
>   and hash:ip,mac sets", it is completed now by Stefano Brivio.
> - ipset nla_policies are fixed to fully support NL_VALIDATE_STRICT and
>   the code is converted from deprecated parsings to verified ones.

Applied, thanks!