[Bug 277029] Invalid source address selection for IPv4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277029

            Bug ID: 277029
           Summary: Invalid source address selection for IPv4
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: nyan@FreeBSD.org

After the following changes, DS-Lite (RFC 6333) does not work due to using
0.0.0.0 as source address.
https://cgit.freebsd.org/src/commit/?id=b0ccf53f2455ad300b8b784c4b1a91a5733e890f
https://cgit.freebsd.org/src/commit/?id=713264f6b8bc5f927dd52cf8ffcccfa397034fec

When I revert the changes, it works fine.
But I think that this issue is related to source address selection for IPv4 and
the IPv4 address on vtnet0 should be selected.

My test environment:

# ifconfig
vtnet0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0
mtu 1500
        options=80028<VLAN_MTU,JUMBO_MTU,LINKSTATE>
        ether 00:a0:98:eb:5c:b2
        inet 192.168.10.14 netmask 0xffffff00 broadcast 192.168.10.255
        inet6 fe80::2a0:98ff:feeb:5cb2%vtnet0 prefixlen 64 scopeid 0x1
        inet6 2405:6581:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX prefixlen 64 autoconf
pltime 604800 vltime 2592000
        media: Ethernet autoselect (10Gbase-T <full-duplex>)
        status: active
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
lo0: flags=1008049<UP,LOOPBACK,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet 127.0.0.1 netmask 0xff000000
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
        groups: lo
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
gif0: flags=1008051<UP,POINTOPOINT,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu
1280
        options=80000<LINKSTATE>
        tunnel inet6 2405:6581:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX -->
2001:c28:YYYY:YYYY::YYYY
        groups: gif
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

# route add -inet default -interface gif0
add net default: gateway gif0

# netstat -4rn
Routing tables

Internet:
Destination        Gateway            Flags     Netif Expire
default            link#3             US         gif0
127.0.0.1          link#2             UH          lo0
192.168.0.0/16     192.168.10.1       UGS      vtnet0
192.168.10.0/24    link#1             U        vtnet0
192.168.10.14      link#2             UHS         lo0

# telnet -4 www.freebsd.org 80
Trying 210.231.212.93...
telnet: connect to address 210.231.212.93: No route to host
Trying 192.50.199.250...
telnet: connect to address 192.50.199.250: No route to host
telnet: Unable to connect to remote host

# telnet -4 -s 192.168.10.14 www.freebsd.org 80
Trying 192.50.199.250...
Connected to web.geo.freebsd.org.
Escape character is '^]'.

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