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ipv6: Add icmp_echo_ignore_multicast support for ICMPv6

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IPv4 has icmp_echo_ignore_broadcast to prevent responding to broadcast pings.
IPv6 needs a similar mechanism.

v1->v2:
- Remove NET_IPV6_ICMP_ECHO_IGNORE_MULTICAST.

Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Suryaputra 2019-03-19 12:37:12 -04:00 committed by David S. Miller
parent f9cb75970e
commit 03f1eccc7a
4 changed files with 19 additions and 0 deletions
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5
Documentation/networking/ip-sysctl.txt
View file

@ -1918,6 +1918,11 @@ echo_ignore_all - BOOLEAN
requests sent to it over the IPv6 protocol.
Default: 0
echo_ignore_multicast - BOOLEAN
If set non-zero, then the kernel will ignore all ICMP ECHO
requests sent to it over the IPv6 protocol via multicast.
Default: 0
xfrm6_gc_thresh - INTEGER
The threshold at which we will start garbage collecting for IPv6
destination cache entries. At twice this value the system will

1
include/net/netns/ipv6.h
View file

@ -33,6 +33,7 @@ struct netns_sysctl_ipv6 {
int auto_flowlabels;
int icmpv6_time;
int icmpv6_echo_ignore_all;
int icmpv6_echo_ignore_multicast;
int anycast_src_echo_reply;
int ip_nonlocal_bind;
int fwmark_reflect;

1
net/ipv6/af_inet6.c
View file

@ -847,6 +847,7 @@ static int __net_init inet6_net_init(struct net *net)
net->ipv6.sysctl.bindv6only = 0;
net->ipv6.sysctl.icmpv6_time = 1*HZ;
net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
net->ipv6.sysctl.flowlabel_consistency = 1;
net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
net->ipv6.sysctl.idgen_retries = 3;

12
net/ipv6/icmp.c
View file

@ -684,6 +684,10 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
struct ipcm6_cookie ipc6;
u32 mark = IP6_REPLY_MARK(net, skb->mark);
if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) &&
net->ipv6.sysctl.icmpv6_echo_ignore_multicast)
return;
saddr = &ipv6_hdr(skb)->daddr;
if (!ipv6_unicast_destination(skb) &&
@ -1115,6 +1119,13 @@ static struct ctl_table ipv6_icmp_table_template[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "echo_ignore_multicast",
.data = &init_net.ipv6.sysctl.icmpv6_echo_ignore_multicast,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{ },
};
@ -1129,6 +1140,7 @@ struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
if (table) {
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;
}
return table;
}