Hi Stanislav,
There is no TX interface information if the packet is for-us. There is only
valid TX interface information if the routing decision was to TX on an
interface. How do you choose the egress Tap?
/neale
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> on behalf of Stanislav Zaikin
via lists.fd.io <zstaseg=gmail....@lists.fd.io>
Date: Friday, 22 January 2021 at 16:29
To: vpp-dev <vpp-dev@lists.fd.io>
Subject: [vpp-dev] local lookup and tx sw_if_index
Hello,
I have a custom node which registered certain protocols (it's basically an old
good "router" plugin).
After "ip4-local" node VPP sends the packet to this node. But there is no
information about TX interface, and I need TX sw_if_index to push my packet to
the corresponding tap device.
If I've understood correctly vnet_buffer(b0)->sw_if_index[VLIB_TX] is set to
fib index.
How can I get TX sw_if_index of the destination address after the lookup?
00:00:39:579495: memif-input
memif: hw_if_index 1 next-index 4
slot: ring 0
00:00:39:587518: ethernet-input
frame: flags 0x1, hw-if-index 1, sw-if-index 1
MPLS: 02:fe:13:14:0e:36 -> 02:fe:4c:84:cc:01
00:00:39:587526: mpls-input
MPLS: next mpls-lookup[1] label 1111 ttl 64 exp 0
00:00:39:587530: mpls-lookup
MPLS: next [6], lookup fib index 0, LB index 33 hash 0 label 1111 eos 1
00:00:39:587534: ip4-mpls-label-disposition-pipe
rpf-id:-1 ip4, pipe
00:00:39:587539: lookup-ip4-dst
fib-index:1 addr:1.1.1.1 load-balance:28
00:00:39:587543: ip4-local
TCP: 100.0.0.2 -> 1.1.1.1
tos 0x00, ttl 63, length 60, checksum 0x1f25 dscp CS0 ecn NON_ECN
fragment id 0xb693, flags DONT_FRAGMENT
TCP: 40740 -> 169
seq. 0x66669613 ack 0x00000000
flags 0x02 SYN, tcp header: 40 bytes
window 64240, checksum 0x0939
00:00:39:587552: tap-inject-tx
tap_inject_tx rx_sw_if 1 tx_sw_if 1 tap fd 23
--
Best regards
Stanislav Zaikin
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