From 03f1eccc7a69c965351e6bee41c62afa2844752f Mon Sep 17 00:00:00 2001 From: Stephen Suryaputra Date: Tue, 19 Mar 2019 12:37:12 -0400 Subject: ipv6: Add icmp_echo_ignore_multicast support for ICMPv6 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 Signed-off-by: David S. Miller --- net/ipv6/icmp.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'net/ipv6/icmp.c') diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c index 802faa2fcc0e..0907bcede5e5 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -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; } -- cgit