Add an arc from your node to the "error-drop" node, set next0 =
MYNODE_NEXT_ERROR and b0->error = node->errors[SOME_ERROR].
Please use the standard dual/single - or quad/single - loop code pattern to
walk the incoming vector of buffer indices. You will hate your life if you try
to code the vector-walk from first principles. It's not impossible, but I it
will be a waste of your time / a bunch of needless aggravation.
b0->sw_if_index[VLIB_TX] is interpreted in a couple of different ways.
"ip4/6-lookup" interprets it as a fib index. "interface-output" interprets it
as a [tx] hardware interface ID.
I'm not sure what you're trying to do, but if it involves an ip lookup, do NOT
set b0->sw_if_index[VLIB_TX]. Let the fib code do its job, and send pkts to
either the input nodes - if mandatory input checks / ttl decrement have not
been performed - or to the lookup stage if e.g. you've rewritten the ip
header(s) in some fashion.
HTH... Dave
-----Original Message-----
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Avi Cohen (A)
Sent: Wednesday, March 7, 2018 6:38 AM
To: vpp-dev@lists.fd.io
Subject: [vpp-dev] VPP - mechanism to drop packets
Hi,
I'm implementing a simple policy plugin , below is the pseudo-code
Go over the packets vector
While (there are packets to process )
{
Check if a packet match a specific rule
If yes - set the out-interface for the packet to be transmitted
Else - drop packet
}
2 Question -
1. is there any function/mechanism that implements a drop ? or any filed in
the packet's metadata for drop marking ?
2. Regarding the set tx out interface - I see that I can set the
sw_if_index[VLIB_TX] - so the packet will be later transmitted through this
interface - is this correct ?
Best Regards
Avi
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