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Code

netfilter: ipset: Allow matching on destination MAC address for mac and ipmac sets

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There doesn't seem to be any reason to restrict MAC address
matching to source MAC addresses in set types bitmap:ipmac,
hash:ipmac and hash:mac. With this patch, and this setup:

  ip netns add A
  ip link add veth1 type veth peer name veth2 netns A
  ip addr add 192.0.2.1/24 dev veth1
  ip -net A addr add 192.0.2.2/24 dev veth2
  ip link set veth1 up
  ip -net A link set veth2 up

  ip netns exec A ipset create test hash:mac
  dst=$(ip netns exec A cat /sys/class/net/veth2/address)
  ip netns exec A ipset add test ${dst}
  ip netns exec A iptables -P INPUT DROP
  ip netns exec A iptables -I INPUT -m set --match-set test dst -j ACCEPT

ipset will match packets based on destination MAC address:

  # ping -c1 192.0.2.2 >/dev/null
  # echo $?
  0

Reported-by: Yi Chen <yiche@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
This commit is contained in:
Stefano Brivio 2018-08-17 21:09:47 +02:00 committed by Jozsef Kadlecsik
parent af510ebd89
commit 8cc4ccf583
3 changed files with 20 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
net/netfilter/ipset/ip_set_bitmap_ipmac.c
View File

@ -219,10 +219,6 @@ bitmap_ipmac_kadt(struct ip_set *set, const struct sk_buff *skb,
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
u32 ip;
/* MAC can be src only */
if (!(opt->flags & IPSET_DIM_TWO_SRC))
return 0;
ip = ntohl(ip4addr(skb, opt->flags & IPSET_DIM_ONE_SRC));
if (ip < map->first_ip || ip > map->last_ip)
return -IPSET_ERR_BITMAP_RANGE;
@ -233,7 +229,11 @@ bitmap_ipmac_kadt(struct ip_set *set, const struct sk_buff *skb,
return -EINVAL;
e.id = ip_to_id(map, ip);
memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN);
if (opt->flags & IPSET_DIM_ONE_SRC)
ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
else
ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
}

16
net/netfilter/ipset/ip_set_hash_ipmac.c
View File

@ -103,7 +103,11 @@ hash_ipmac4_kadt(struct ip_set *set, const struct sk_buff *skb,
(skb_mac_header(skb) + ETH_HLEN) > skb->data)
return -EINVAL;
memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN);
if (opt->flags & IPSET_DIM_ONE_SRC)
ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
else
ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
if (ether_addr_equal(e.ether, invalid_ether))
return -EINVAL;
@ -211,15 +215,15 @@ hash_ipmac6_kadt(struct ip_set *set, const struct sk_buff *skb,
};
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
/* MAC can be src only */
if (!(opt->flags & IPSET_DIM_TWO_SRC))
return 0;
if (skb_mac_header(skb) < skb->head ||
(skb_mac_header(skb) + ETH_HLEN) > skb->data)
return -EINVAL;
memcpy(e.ether, eth_hdr(skb)->h_source, ETH_ALEN);
if (opt->flags & IPSET_DIM_ONE_SRC)
ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
else
ether_addr_copy(e.ether, eth_hdr(skb)->h_dest);
if (ether_addr_equal(e.ether, invalid_ether))
return -EINVAL;

10
net/netfilter/ipset/ip_set_hash_mac.c
View File

@ -81,15 +81,15 @@ hash_mac4_kadt(struct ip_set *set, const struct sk_buff *skb,
struct hash_mac4_elem e = { { .foo[0] = 0, .foo[1] = 0 } };
struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
/* MAC can be src only */
if (!(opt->flags & IPSET_DIM_ONE_SRC))
return 0;
if (skb_mac_header(skb) < skb->head ||
(skb_mac_header(skb) + ETH_HLEN) > skb->data)
return -EINVAL;
ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
if (opt->flags & IPSET_DIM_ONE_SRC)
ether_addr_copy(e.ether, eth_hdr(skb)->h_source);
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);