D9163.diff
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	Index: head/sys/netinet/tcp_usrreq.c
	===================================================================
	--- head/sys/netinet/tcp_usrreq.c
	+++ head/sys/netinet/tcp_usrreq.c
	@@ -597,6 +597,10 @@
	error = EINVAL;
	goto out;
	}
	+ if ((inp->inp_vflag & INP_IPV4) == 0) {
	+ error = EAFNOSUPPORT;
	+ goto out;
	+ }

	in6_sin6_2_sin(&sin, sin6p);
	inp->inp_vflag \|= INP_IPV4;
	@@ -614,6 +618,11 @@
	#endif
	error = tp->t_fb->tfb_tcp_output(tp);
	goto out;
	+ } else {
	+ if ((inp->inp_vflag & INP_IPV6) == 0) {
	+ error = EAFNOSUPPORT;
	+ goto out;
	+ }
	}
	#endif
	inp->inp_vflag &= ~INP_IPV4;
	Index: head/sys/netinet6/udp6_usrreq.c
	===================================================================
	--- head/sys/netinet6/udp6_usrreq.c
	+++ head/sys/netinet6/udp6_usrreq.c
	@@ -1119,6 +1119,10 @@
	error = EINVAL;
	goto out;
	}
	+ if ((inp->inp_vflag & INP_IPV4) == 0) {
	+ error = EAFNOSUPPORT;
	+ goto out;
	+ }
	if (inp->inp_faddr.s_addr != INADDR_ANY) {
	error = EISCONN;
	goto out;
	@@ -1136,6 +1140,11 @@
	if (error == 0)
	soisconnected(so);
	goto out;
	+ } else {
	+ if ((inp->inp_vflag & INP_IPV6) == 0) {
	+ error = EAFNOSUPPORT;
	+ goto out;
	+ }
	}
	#endif
	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {