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net-test: packetdrill: add PSP encryption #82

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Add packetdrill support for the PSP encryption protocol, both in tunnel and transport mode.

For more information on PSP, see the architecture spec at https://github.com/google/psp/blob/main/doc/PSP_Arch_Spec.pdf

Implementation by to Dimitris Michailidis dmichail@google.com

This implementation is against the upstream draft PSP protocol as published at https://github.com/wdebruij/psp/tree/linux-v5.15-psp-v1.1 This is for demonstration purposes only: an upstream Linux ABI is expected to look significantly different.

Tested:
Test psp scripts with a psp-capable tuntap device in qemu

step 1: build kernel with psp support

git clone https://github.com/wdebruij/psp.git
cd psp
git checkout origin/linux-v5.15-psp-v1.1
make defconfig
make kvm_guest.config
sed -i 's/#\ CONFIG_TUN\ is\ not\ set/CONFIG_TUN=y/' .config
make -j $(nproc) bzImage

step 2 inside qemu, build and run packetdrill

git clone github.com/google/packetdrill
cd gtests/net/packetdrill
make && make tests
PDIR=${PWD}

cd ../tcp
$PDIR/in_netns.sh $PDIR/packetdrill --ip_version=ipv6 --mtu=1520 psp/psp_client_sockopt.pkt
$PDIR/in_netns.sh $PDIR/packetdrill --ip_version=ipv6 --mtu=1520 psp/psp_server_sockopt.pkt

Add packetdrill support for the PSP encryption protocol,
both in tunnel and transport mode.

For more information on PSP, see the architecture spec at
https://github.com/google/psp/blob/main/doc/PSP_Arch_Spec.pdf

Implementation by to Dimitris Michailidis <dmichail@google.com>

This implementation is against the upstream draft PSP protocol as
published at https://github.com/wdebruij/psp/tree/linux-v5.15-psp-v1.1
This is for demonstration purposes only: an upstream Linux ABI is
expected to look significantly different.

Tested:
  Test psp scripts with a psp-capable tuntap device in qemu

  # step 1: build kernel with psp support
  git clone https://github.com/wdebruij/psp.git
  cd psp
  git checkout origin/linux-v5.15-psp-v1.1
  make defconfig
  make kvm_guest.config
  sed -i 's/#\ CONFIG_TUN\ is\ not\ set/CONFIG_TUN=y/' .config
  make -j $(nproc) bzImage

  # step 2 inside qemu, build and run packetdrill
  git clone github.com/google/packetdrill
  cd gtests/net/packetdrill
  make && make tests
  PDIR=${PWD}

  cd ../tcp
  $PDIR/in_netns.sh $PDIR/packetdrill --ip_version=ipv6 --mtu=1520 psp/psp_client_sockopt.pkt
  $PDIR/in_netns.sh $PDIR/packetdrill --ip_version=ipv6 --mtu=1520 psp/psp_server_sockopt.pkt

Signed-off-by: Willem de Bruijn <willemb@google.com>
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