I have the following output from [`hping`](http://ports.su/net/hping) on OpenBSD:

```
# hping --icmp-ts www.openbsd.org
HPING www.openbsd.org (re0 129.128.5.194): icmp mode set, 28 headers + 0 data bytes
len=46 ip=129.128.5.194 ttl=237 id=23807 icmp_seq=0 rtt=155.3 ms
ICMP timestamp: Originate=22085077 Receive=22085171 Transmit=22085171
ICMP timestamp RTT tsrtt=156

len=46 ip=129.128.5.194 ttl=237 id=4150 icmp_seq=1 rtt=154.8 ms
ICMP timestamp: Originate=22086078 Receive=22086171 Transmit=22086171
ICMP timestamp RTT tsrtt=155

^C
--- www.openbsd.org hping statistic ---
2 packets tramitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 154.8/155.0/155.3 ms

```

I require some extra arithmetic [to troubleshoot asymmetric routes](https://networkengineering.stackexchange.com/questions/5132/measure-one-way-latency-jitter-packet-loss), as available in [a patch in some bugreport](http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=651270), but I don't want to have to recompile the software.

TL;DR, the two new fields are calculated as `Receive − Originate` and `Originate + tsrtt − Transmit`, to result in something like the following (without necessarily having to span 4 lines).

```
len=46 ip=129.128.5.194 ttl=237 id=23807 icmp_seq=0 rtt=155.3 ms
ICMP timestamp: Originate=22085077 Receive=22085171 Transmit=22085171
ICMP timestamp RTT tsrtt=156  src->dst=94  dst->src=62

```

How do I do this with `awk`? (I'm fine with any other \*BSD tool, too.)