teach bgpctl about IPv6 MPLS VPN

[Claudio Jeker]

Bgpctl has a way to specify the address family to show in 'show rib'
commands. Teach it to also support IPv6 MPLS VPNs (aka VPNv6).

OK?
-- 
:wq Claudio

Index: parser.c
===================================================================
RCS file: /cvs/src/usr.sbin/bgpctl/parser.c,v
retrieving revision 1.101
diff -u -p -r1.101 parser.c
--- parser.c    22 Jan 2020 07:52:38 -0000      1.101
+++ parser.c    7 May 2020 17:11:38 -0000
@@ -581,6 +581,11 @@ match_token(int *argc, char **argv[], co
                                t = &table[i];
                                res.aid = AID_VPN_IPv4;
                        }
+                       if (!strcasecmp(word, "VPNv6")) {
+                               match++;
+                               t = &table[i];
+                               res.aid = AID_VPN_IPv6;
+                       }
                        break;
                case ADDRESS:
                        if (parse_addr(word, &res.addr)) {
@@ -878,7 +883,8 @@ show_valid_args(const struct token table
                        fprintf(stderr, "  <pftable>\n");
                        break;
                case FAMILY:
-                       fprintf(stderr, "  [ inet | inet6 | IPv4 | IPv6 | VPNv4 
]\n");
+                       fprintf(stderr, "  [ inet | inet6 | IPv4 | IPv6 | "
+                           "VPNv4 | VPNv6 ]\n");
                        break;
                case FILENAME:
                        fprintf(stderr, "  <filename>\n");