[Bug 252883] [net][route][loopback] lo1 IP is not added tp routing table of cloned interface via rc.d at startup

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252883

            Bug ID: 252883
           Summary: [net][route][loopback] lo1 IP is not added tp routing
                    table of cloned interface via rc.d at startup
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: dch at freebsd.org

IP routes for loopback cloned interfaces shouldn't need
to have a static route manually added. Regression is
probably present for several weeks, I think.

# ping 100.64.0.1
PING 100.64.0.1 (100.64.0.1): 56 data bytes
^C

# netstat -4rn

Routing tables

Internet:
Destination        Gateway            Flags     Netif Expire
default            172.16.1.1         UGS        igb0
127.0.0.1          link#3             UHS         lo0
172.16.1.0/24      link#1             U          igb0
172.16.1.4         link#1             UHS         lo0

### the following is missing, then the above now works

# route add 100.64.0.1/28 100.64.0.1

uname 13.0-ALPHA1 main-c256063-g098c902b5202 (~ 2021-01-18)

To reproduce:

default install, add these to /etc/rc.conf, reboot or /etc/netstart. 
Issue is also present with a more typical RFC1918 range, I tested with
192.168.0.1 as well.

# /etc/rc.conf
cloned_interfaces="${cloned_interfaces} lo1"
ifconfig_lo1="inet 100.64.0.1/28"
ifconfig_lo1_aliases="inet 100.64.0.2-15/32"


# ifconfig lo1
lo1: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 fe80::1%lo1 prefixlen 64 scopeid 0x4
        inet 100.64.0.1  netmask 0xfffffff0
        inet 100.64.0.2  netmask 0xffffffff
...
        inet 100.64.0.15 netmask 0xffffffff
        groups: lo
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

# route -nv get 100.64.0.1
RTA_DST: inet 100.64.0.1; RTA_IFP: link ; RTM_GET: Report Metrics: len 224,
pid: 0, seq 1, errno 0, flags:<UP,GATEWAY,HOST,STATIC>
locks:  inits: 
sockaddrs: <DST,IFP>
 100.64.0.1 link#0
   route to: 100.64.0.1
destination: 0.0.0.0
       mask: 0.0.0.0
    gateway: 172.16.1.1
        fib: 0
  interface: igb0
      flags: <UP,GATEWAY,DONE,STATIC>
 recvpipe  sendpipe  ssthresh  rtt,msec    mtu        weight    expire
       0         0         0         0      1500         1         0 

locks:  inits: 
sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA>
 0.0.0.0 172.16.1.1 0.0.0.0 igb0:ac.1f.6b.67.e1.38 172.16.1.4

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