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Subject[PATCH AUTOSEL 4.19 016/100] netfilter: ipset: Make invalid MAC address checks consistent
Date
From: Stefano Brivio <sbrivio@redhat.com>

[ Upstream commit 29edbc3ebdb0faa934114f14bf12fc0b784d4f1b ]

Set types bitmap:ipmac and hash:ipmac check that MAC addresses
are not all zeroes.

Introduce one missing check, and make the remaining ones
consistent, using is_zero_ether_addr() instead of comparing
against an array containing zeroes.

This was already done for hash:mac sets in commit 26c97c5d8dac
("netfilter: ipset: Use is_zero_ether_addr instead of static and
memcmp").

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/netfilter/ipset/ip_set_bitmap_ipmac.c | 3 +++
net/netfilter/ipset/ip_set_hash_ipmac.c | 11 ++++-------
2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/net/netfilter/ipset/ip_set_bitmap_ipmac.c b/net/netfilter/ipset/ip_set_bitmap_ipmac.c
index 4f01321e793ce..794e0335a8648 100644
--- a/net/netfilter/ipset/ip_set_bitmap_ipmac.c
+++ b/net/netfilter/ipset/ip_set_bitmap_ipmac.c
@@ -235,6 +235,9 @@ bitmap_ipmac_kadt(struct ip_set *set, const struct sk_buff *skb,
else
ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);

+ if (is_zero_ether_addr(e.ether))
+ return -EINVAL;
+
return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
}

diff --git a/net/netfilter/ipset/ip_set_hash_ipmac.c b/net/netfilter/ipset/ip_set_hash_ipmac.c
index 16ec822e40447..25560ea742d66 100644
--- a/net/netfilter/ipset/ip_set_hash_ipmac.c
+++ b/net/netfilter/ipset/ip_set_hash_ipmac.c
@@ -36,9 +36,6 @@ MODULE_ALIAS("ip_set_hash:ip,mac");
/* Type specific function prefix */
#define HTYPE hash_ipmac

-/* Zero valued element is not supported */
-static const unsigned char invalid_ether[ETH_ALEN] = { 0 };
-
/* IPv4 variant */

/* Member elements */
@@ -104,7 +101,7 @@ hash_ipmac4_kadt(struct ip_set *set, const struct sk_buff *skb,
else
ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);

- if (ether_addr_equal(e.ether, invalid_ether))
+ if (is_zero_ether_addr(e.ether))
return -EINVAL;

ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
@@ -140,7 +137,7 @@ hash_ipmac4_uadt(struct ip_set *set, struct nlattr *tb[],
if (ret)
return ret;
memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
- if (ether_addr_equal(e.ether, invalid_ether))
+ if (is_zero_ether_addr(e.ether))
return -IPSET_ERR_HASH_ELEM;

return adtfn(set, &e, &ext, &ext, flags);
@@ -220,7 +217,7 @@ hash_ipmac6_kadt(struct ip_set *set, const struct sk_buff *skb,
else
ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);

- if (ether_addr_equal(e.ether, invalid_ether))
+ if (is_zero_ether_addr(e.ether))
return -EINVAL;

ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
@@ -260,7 +257,7 @@ hash_ipmac6_uadt(struct ip_set *set, struct nlattr *tb[],
return ret;

memcpy(e.ether, nla_data(tb[IPSET_ATTR_ETHER]), ETH_ALEN);
- if (ether_addr_equal(e.ether, invalid_ether))
+ if (is_zero_ether_addr(e.ether))
return -IPSET_ERR_HASH_ELEM;

return adtfn(set, &e, &ext, &ext, flags);
--
2.20.1
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