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authorStephen Suryaputra <ssuryaextr@gmail.com>2019-03-20 10:29:27 -0400
committerDavid S. Miller <davem@davemloft.net>2019-03-20 16:29:37 -0700
commit0b03a5ca8b14321366eec4a903922d2b46d585ff (patch)
treedd57f1bdfad2cdd949bde6d02fafa392fd374001 /net/ipv6/icmp.c
parentnet: isdn: Make isdn_ppp_mp_discard and isdn_ppp_mp_reassembly static (diff)
downloadlinux-dev-0b03a5ca8b14321366eec4a903922d2b46d585ff.tar.xz
linux-dev-0b03a5ca8b14321366eec4a903922d2b46d585ff.zip
ipv6: Add icmp_echo_ignore_anycast for ICMPv6
In addition to icmp_echo_ignore_multicast, there is a need to also prevent responding to pings to anycast addresses for security. Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/ipv6/icmp.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 0907bcede5e5..cc14b9998941 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -683,6 +683,7 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
struct dst_entry *dst;
struct ipcm6_cookie ipc6;
u32 mark = IP6_REPLY_MARK(net, skb->mark);
+ bool acast;
if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) &&
net->ipv6.sysctl.icmpv6_echo_ignore_multicast)
@@ -690,9 +691,12 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
saddr = &ipv6_hdr(skb)->daddr;
+ acast = ipv6_anycast_destination(skb_dst(skb), saddr);
+ if (acast && net->ipv6.sysctl.icmpv6_echo_ignore_anycast)
+ return;
+
if (!ipv6_unicast_destination(skb) &&
- !(net->ipv6.sysctl.anycast_src_echo_reply &&
- ipv6_anycast_destination(skb_dst(skb), saddr)))
+ !(net->ipv6.sysctl.anycast_src_echo_reply && acast))
saddr = NULL;
memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
@@ -1126,6 +1130,13 @@ static struct ctl_table ipv6_icmp_table_template[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
+ {
+ .procname = "echo_ignore_anycast",
+ .data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_anycast,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
{ },
};
@@ -1141,6 +1152,7 @@ struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
table[0].data = &net->ipv6.sysctl.icmpv6_time;
table[1].data = &net->ipv6.sysctl.icmpv6_echo_ignore_all;
table[2].data = &net->ipv6.sysctl.icmpv6_echo_ignore_multicast;
+ table[3].data = &net->ipv6.sysctl.icmpv6_echo_ignore_anycast;
}
return table;
}