>> The question is: when do you test for the PID? You would have to do it
>> within send(), because anywhere else, you do not know. A socket may be
>> shared among multiple processes (most simple way: fork()).
>
>I'm hooking in NF_IP_LOCAL_OUT of netfilter code using nf_register_hook() function.
In sys_send(), I would have said you could use "current", but in netfilter
I can't tell exactly whether it is going to work on SMP.
Check net/ipv4/netfilter/ipt_owner.c, it provides a way to match packets vs
pids, but it's not easy to find out.
Jan Engelhardt
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