On 4/14/23 23:12, Ihar Hrachyshka wrote:
> Scapy allows to define packets in descriptive form that is easier to
> digest and debug.
>
> Signed-off-by: Ihar Hrachyshka <[email protected]>
> Acked-by: Ales Musil <[email protected]>
> Acked-by: Dumitru Ceara <[email protected]>
> ---
> v1: initial version.
> v2: use .decode() instead of sed to truncate b'...'.
> v2: remove unnecessary backspaces in example of use.
> v2: use $PYTHON3.
> v3: <no changes>.
> v4: added missing acks from previous reviews.
> v5: <no changes>.
> ---
> tests/ovn-macros.at | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/tests/ovn-macros.at b/tests/ovn-macros.at
> index ee942e8a6..6f2d085ae 100644
> --- a/tests/ovn-macros.at
> +++ b/tests/ovn-macros.at
> @@ -817,6 +817,29 @@ ovn_trace_client() {
> ovs-appctl -t $target trace "$@" | tee trace | sed '/^# /d'
> }
>
> +# Receives a string with scapy python code that represents a packet.
> +# Returns a hex-string that contains bytes that reflect the packet symbolic
> +# description.
> +#
> +# Scapy docs: https://scapy.readthedocs.io/en/latest/usage.html
> +#
> +# Example of usage:
> +#
> +# packet=$(fmt_pkt "
> +# Ether(dst='ff:ff:ff:ff:ff:ff', src='50:64:00:00:00:01') /
> +# IPv6(src='abed::1', dst='ff02::1:ff00:2') /
> +# ICMPv6ND_NS(tgt='abed::2')
> +# ")
> +#
> +# ovs-appctl netdev-dummy/receive $vif $packet
> +#
> +fmt_pkt() {
> + echo "from scapy.all import *; \
> + import binascii; \
> + out = binascii.hexlify(raw($1)); \
> + print(out.decode())" | $PYTHON3
> +}
> +
> OVS_END_SHELL_HELPERS
>
> m4_define([OVN_POPULATE_ARP], [AT_CHECK(ovn_populate_arp__, [0], [ignore])])
This is awesome and really useful!
I applied it to main and backported it to all stable branches down to
22.03 (LTS). To make it work properly on older branches I had to
actually install scapy via pip (like we do on main in CI) similar to
Ales' commit 97b5aa54571a ("ci: Add missing packages to the container").
I added a note in the backports' commit log.
Thanks,
Dumitru
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