From: Alexei Starovoitov
Date: Thu, 4 Jun 2015 10:11:54 -0700
> allow programs read/write skb->mark, tc_index fields and
> ((struct qdisc_skb_cb *)cb)->data.
>
> mark and tc_index are generically useful in TC.
> cb[0]-cb[4] are primarily used to pass arguments from one
> program to another call
allow programs read/write skb->mark, tc_index fields and
((struct qdisc_skb_cb *)cb)->data.
mark and tc_index are generically useful in TC.
cb[0]-cb[4] are primarily used to pass arguments from one
program to another called via bpf_tail_call() which can
be seen in sockex3_kern.c example.
All fiel
