Hello! I've ported the ip, tcp and udp DTrace providers to FreeBSD, following the Solaris documentation here:
https://wikis.oracle.com/display/DTrace/ip+Provider https://wikis.oracle.com/display/DTrace/tcp+Provider https://wikis.oracle.com/display/DTrace/udp+Provider My implementation of these providers makes use of dynamic translators, for which FreeBSD support was added in r254468; this patch won't compile with earlier revisions. The use of dynamic translators means that existing DTrace scripts which use these providers will just work when run on FreeBSD - no modifications needed. In particular, all of the examples in the links above will work properly on FreeBSD with my diff. I've collected a bunch of example scripts for these providers and placed them here: http://people.freebsd.org/~markj/dtrace/network-providers/ To run one you just need to execute "dtrace -s <script>". In general these providers make it trivial to monitor or count packets and bytes on a per-host/port/protocol/interface basis. One can also do neat things like watch TCP connection state transitions in real time (tcpstate.d) and measure connection latency. All of the probes correspond to logical events in their respective protocol implementations; all of the providers have send and receive probes, and the tcp provider has a few more. I didn't have to make any major changes to add support for these providers, but I've made a few small tweaks: 1. Add a little helper function for TCP state changes instead of sprinkling a bunch of SDT_PROBE calls throughout the code. 2. Set the IPv6 payload size in TCP and UDP before calling ip6_output(). This is done for the send probes so that the ipinfo_t argument can be used to get the payload size. It's not quite correct since it doesn't include the length of IPv6 option headers (they aren't known yet), but I think that's ok for the purposes of these providers. 3. Set the IPv4 header version in udp_output(). This is already done for IPv6. I'm hoping that none of this (or the rest of the diff) is controversial, but I wanted to make sure, so any review would be really appreciated. The patch is here: http://people.freebsd.org/~markj/patches/network-providers/network-providers-1.diff It depends on r254468. To use it, just recompile the kernel (assuming that KDTRACE_HOOKS is enabled) and copy $SRC/cddl/lib/libdtrace/{ip,tcp,udp}.d (added by the patch) to /usr/lib/dtrace. Then the example scripts I linked above should just work. Thanks! -Mark _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
