On 04/03/2017 12:31 PM, Daniel Borkmann wrote:
On 04/03/2017 03:40 PM, Mauricio Vasquez via iovisor-dev wrote:
Dear All,
I am trying to inject a BPF_PROG_TYPE_SCHED_ACT program and attach it
to the TC using C++.
Out of curiosity, why not .._SCHED_CLS program in direct-action mode
(same functionality wrt BPF and would save you additional layers of
indirection in tc at least), or are you required to run something
different as a classifier entity?
That's a good question. I have to admit that we haven't looked at the
very detail of this, we base our work on hover that uses ..._SCHED_ACT.
According to some documentation I read ..._SCHED_CLS programs should
work in our case. I'll further investigate on it, thanks for noticing it!
I had no particular problems compiling and injecting the program,
however I haven't been able to attach it to TC, I know that in go I
can use the netlink library [1] or in python pyroute2 [2],
unfortunately it appears not to be a similar library in C++
Is there a library that implements this functionality for C or C++?
in case of negative, does some body have a example code of how to
achieve this using the netlink protocol?
Not aware of a C++ lib (but I also haven't looked much). You could
check the iproute2 code, f.e. tc/f_bpf.c to set up the nl message.
Thanks for that pointer, I'll take a look.
Thanks in Advance,
Mauricio
[1] https://github.com/vishvananda/netlink
[2] http://docs.pyroute2.org/
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