Update man page with SSM group join/leave support

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

smcroute.8

@@ -13,6 +13,7 @@
 .Op Fl p Ar USER:GROUP
 .Op Fl a | Fl r Ar ROUTE
 .Op Fl j | Fl l Ar GROUP
+.Op Fl x | Fl y Ar GROUP
 .Sh DESCRIPTION
 .Nm
 is a command line tool to manipulate the multicast routes of a UNIX
@@ -141,6 +142,10 @@ Remove a kernel multicast route.
 Join a multicast group on a given interface.
 .It Fl l Ar IFNAME GROUP
 Leave a multicast group on a given interface.
+.It Fl x Ar IFNAME SOURCE GROUP
+Join a source specific multicast (SSM) group on a given interface.
+.It Fl y Ar IFNAME SOURCE GROUP
+Leave a source specific multicast (SSM) group on a given interface.
 .El
 .Pp
 Multicast routes can be added with the

smcroute.c

@@ -709,8 +709,8 @@ static int usage(int code)
 	       "  -j ARGS  Join a multicast group\n"
 	       "  -l ARGS  Leave a multicast group\n"
 	       "\n"
-	       "  -x ARGS  Join a multicast group (Source Specific Multicast version)\n"
-	       "  -y ARGS  Leave a multicast group (Source Specific Multicast version)\n"
+	       "  -x ARGS  Join a multicast group (Source Specific Multicast, SSM)\n"
+	       "  -y ARGS  Leave a multicast group (Source Specific Multicast, SSM)\n"
 	       "\n"
 	       "     <------------- INBOUND -------------->  <----- OUTBOUND ------>\n"
 	       "  -a <IFNAME> <SOURCE-IP> <MULTICAST-GROUP>  <IFNAME> [<IFNAME> ...]\n"