Revive the RTF_LLINFO flag in route.h. The kernel code is guarded

by the new kernel option COMPAT_ROUTE_FLAGS for binary backward
compatibility. The RTF_LLDATA flag maps to the same value as RTF_LLINFO.
RTF_LLDATA is used by the arp and ndp utilities. The RTF_LLDATA flag is
always returned to the userland regardless whether the COMPAT_ROUTE_FLAGS
is defined.

4 files changed, 14 insertions, 2 deletions

diff --git a/sys/conf/options b/sys/conf/options
index 34c1d63..b7424f61 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -411,6 +411,7 @@ PPP_DEFLATE		opt_ppp.h
 PPP_FILTER		opt_ppp.h
 RADIX_MPATH		opt_mpath.h
 ROUTETABLES		opt_route.h
+COMPAT_ROUTE_FLAGS	opt_route.h
 SLIP_IFF_OPTS		opt_slip.h
 TCPDEBUG
 TCP_OFFLOAD_DISABLE	opt_inet.h #Disable code to dispatch tcp offloading
diff --git a/sys/net/route.h b/sys/net/route.h
index ed43496..44b04ac 100644
--- a/sys/net/route.h
+++ b/sys/net/route.h
@@ -173,7 +173,8 @@ struct ortentry {
 /*			0x80		   unused, was RTF_DELCLONE */
 /*			0x100		   unused, was RTF_CLONING */
 #define RTF_XRESOLVE	0x200		/* external daemon resolves name */
-/*			0x400		   unused, was RTF_LLINFO */
+#define RTF_LLINFO	0x400		/* DEPRECATED - exists ONLY for backward 
+					   compatibility */
 #define RTF_LLDATA	0x400		/* used by apps to add/del L2 entries */
 #define RTF_STATIC	0x800		/* manually added */
 #define RTF_BLACKHOLE	0x1000		/* just discard pkts (during updates) */
diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c
index 45e3c92..8c5499c 100644
--- a/sys/net/rtsock.c
+++ b/sys/net/rtsock.c
@@ -31,6 +31,7 @@
  */
 #include "opt_sctp.h"
 #include "opt_mpath.h"
+#include "opt_route.h"
 #include "opt_inet.h"
 #include "opt_inet6.h"
 
@@ -1446,7 +1447,12 @@ sysctl_rtsock(SYSCTL_HANDLER_ARGS)
 		 * take care of llinfo entries, the caller must
 		 * specify an AF
 		 */
-		if (w.w_op == NET_RT_FLAGS && w.w_arg == 0) {
+		if (w.w_op == NET_RT_FLAGS &&
+#if defined(COMPAT_ROUTE_FLAGS)
+		    (w.w_arg & RTF_LLINFO)) {
+#else
+		    w.w_arg == 0) {
+#endif
 			if (af != 0)
 				error = lltable_sysctl_dumparp(af, w.w_req);
 			else
diff --git a/sys/netinet6/in6.c b/sys/netinet6/in6.c
index b7c5111..fc0333b 100644
--- a/sys/netinet6/in6.c
+++ b/sys/netinet6/in6.c
@@ -2252,6 +2252,10 @@ in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
 			 */
 			bzero(&ndpc, sizeof(ndpc));
 			ndpc.rtm.rtm_msglen = sizeof(ndpc);
+			ndpc.rtm.rtm_version = RTM_VERSION;
+			ndpc.rtm.rtm_type = RTM_GET;
+			ndpc.rtm.rtm_flags = RTF_UP;
+			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
 			ndpc.sin6.sin6_family = AF_INET6;
 			ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
 			bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));