[Bug 284857] wg(4): IPv4 packet with IPv6 nexthop not forwarded

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284857

Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> changed:

           What    |Removed                     |Added
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                 CC|                            |zarychtam@plan-b.pwste.edu.
                   |                            |pl

--- Comment #1 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
Created attachment 258107
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=258107&action=edit
0001-wg-Unbreak-IPv4-routes-with-an-IPv6-next-hops.patch

Tested in semi-production scenario:

[hamal] /usr/src_head# route add 10.0.0.x/32 -6 2001:db8:db8::1
add net 10.0.0.x: gateway 2001:db8:db8::1 fib 0
[hamal] /usr/src_head# route get 10.0.0.x
   route to: 10.0.0.x
destination: 10.0.0.x
    gateway: 2001:db8:db8::1
        fib: 0
  interface: wg1
      flags: <UP,GATEWAY,HOST,DONE,STATIC>
 recvpipe  sendpipe  ssthresh  rtt,msec    mtu        weight    expire
       0         0         0         0      1420         1         0
[hamal] /usr/src_head# ping -c 3 -S 172.19.3.5 10.0.0.x
PING 10.0.0.x (10.0.0.x) from 172.19.3.5: 56 data bytes
64 bytes from 10.0.0.x: icmp_seq=0 ttl=63 time=8.893 ms
64 bytes from 10.0.0.x: icmp_seq=1 ttl=63 time=8.515 ms
64 bytes from 10.0.0.x: icmp_seq=2 ttl=63 time=8.506 ms

--- 10.0.0.x ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 8.506/8.638/8.893/0.180 ms

Tested from recent 15.0-CURRENT to 14.2-STABLE on the remote endpoint. Both
endpoints were patched. Without this patch, the test was falling as reported
above.

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