bgpd force fib sync in fetchtable

[Claudio Jeker]

On startup we load the routing table in bgpd and at that moment a cleanup
of old bgpd routes should happen. I noticed this is not the case because
fib_sync is not set and so send_rtmsg() just returns.
I think we need to force fib_sync in fetchtable() to make sure the cleanup
happens correctly.

OK?
-- 
:wq Claudio

Index: kroute.c
===================================================================
RCS file: /cvs/src/usr.sbin/bgpd/kroute.c,v
retrieving revision 1.285
diff -u -p -r1.285 kroute.c
--- kroute.c    28 Jul 2022 14:05:13 -0000      1.285
+++ kroute.c    2 Aug 2022 10:13:59 -0000
@@ -2726,6 +2726,7 @@ fetchtable(struct ktable *kt)
        char                    *buf = NULL, *next, *lim;
        struct rt_msghdr        *rtm;
        struct kroute_full       kf;
+       int                      fib_sync;
 
        mib[0] = CTL_NET;
        mib[1] = PF_ROUTE;
@@ -2754,6 +2755,10 @@ fetchtable(struct ktable *kt)
                }
        }
 
+       /* force fib_sync on during fetch */
+       fib_sync = kt->fib_sync;
+       kt->fib_sync = 1;
+
        lim = buf + len;
        for (next = buf; next < lim; next += rtm->rtm_msglen) {
                rtm = (struct rt_msghdr *)next;
@@ -2768,6 +2773,8 @@ fetchtable(struct ktable *kt)
                else
                        kroute_insert(kt, &kf);
        }
+       kt->fib_sync = fib_sync;
+
        free(buf);
        return (0);
 }