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diff --git a/share/man/man4/inet6.4 b/share/man/man4/inet6.4
--- a/share/man/man4/inet6.4
+++ b/share/man/man4/inet6.4
@@ -29,7 +29,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd November 25, 2020
+.Dd November 12, 2021
.Dt INET6 4
.Os
.Sh NAME
@@ -341,6 +341,14 @@
.Dv AF_INET6
sockets.
Defaults to on.
+.It Va ip6.source_address_validation
+Boolean: perform source address validation for packets destined for the local
+host.
+Consider this as following Section 3.2 of RFC3704/BCP84, where we treat local
+host as our own infrastructure.
+This has no effect on packets to be forwarded, so don't consider it as
+anti-spoof feature for a router.
+Enabled by default.
.El
.Ss Interaction between IPv4/v6 sockets
By default,
diff --git a/sys/netinet6/ip6_input.c b/sys/netinet6/ip6_input.c
--- a/sys/netinet6/ip6_input.c
+++ b/sys/netinet6/ip6_input.c
@@ -163,6 +163,12 @@
0, 0, sysctl_netinet6_intr_queue_maxlen, "I",
"Maximum size of the IPv6 input queue");
+VNET_DEFINE_STATIC(bool, ip6_sav) = true;
+#define V_ip6_sav VNET(ip6_sav)
+SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, source_address_validation,
+ CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sav), true,
+ "Drop incoming packets with source address that is a local address");
+
#ifdef RSS
static struct netisr_handler ip6_direct_nh = {
.nh_name = "ip6_direct",
@@ -816,6 +822,12 @@
ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
goto bad;
}
+ if (V_ip6_sav && !(rcvif->if_flags & IFF_LOOPBACK) &&
+ __predict_false(in6_localip_fib(&ip6->ip6_src,
+ rcvif->if_fib))) {
+ IP6STAT_INC(ip6s_badscope); /* XXX */
+ goto bad;
+ }
/* Count the packet in the ip address stats */
counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len);

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