mirror of
https://passt.top/passt
synced 2024-10-02 03:55:48 +00:00
105b916361
This is a reimplementation, partially building on the earlier draft, that uses L4 sockets (SOCK_DGRAM, SOCK_STREAM) instead of SOCK_RAW, providing L4-L2 translation functionality without requiring any security capability. Conceptually, this follows the design presented at: https://gitlab.com/abologna/kubevirt-and-kvm/-/blob/master/Networking.md The most significant novelty here comes from TCP and UDP translation layers. In particular, the TCP state and translation logic follows the intent of being minimalistic, without reimplementing a full TCP stack in either direction, and synchronising as much as possible the TCP dynamic and flows between guest and host kernel. Another important introduction concerns addressing, port translation and forwarding. The Layer 4 implementations now attempt to bind on all unbound ports, in order to forward connections in a transparent way. While at it: - the qemu 'tap' back-end can't be used as-is by qrap anymore, because of explicit checks now introduced in qemu to ensure that the corresponding file descriptor is actually a tap device. For this reason, qrap now operates on a 'socket' back-end type, accounting for and building the additional header reporting frame length - provide a demo script that sets up namespaces, addresses and routes, and starts the daemon. A virtual machine started in the network namespace, wrapped by qrap, will now directly interface with passt and communicate using Layer 4 sockets provided by the host kernel. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
70 lines
1.9 KiB
Bash
Executable File
70 lines
1.9 KiB
Bash
Executable File
#!/bin/sh -e
|
|
#
|
|
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
#
|
|
# PASST - Plug A Simple Socket Transport
|
|
#
|
|
# demo.sh - Set up namespaces, addresses and routes to show PASST functionality
|
|
#
|
|
# Copyright (c) 2020-2021 Red Hat GmbH
|
|
# Author: Stefano Brivio <sbrivio@redhat.com>
|
|
|
|
get_token() {
|
|
IFS=' '
|
|
__next=0
|
|
for __token in ${@}; do
|
|
[ ${__next} -eq 2 ] && echo "${__token}" && return
|
|
[ "${__token}" = "${1}" ] && __next=$((__next + 1))
|
|
done
|
|
unset IFS
|
|
}
|
|
|
|
ipv6_dev() { get_token "dev" $(ip -o -6 ro show default); }
|
|
ipv6_devaddr() { get_token "inet6" $(ip -o -6 ad sh dev "${1}" scope global); }
|
|
ipv6_ll_addr() { get_token "inet6" $(ip -o -6 ad sh dev "${1}" scope link); }
|
|
ipv6_mask() { echo ${1#*/}; }
|
|
ipv6_mangle() {
|
|
IFS=':'
|
|
__c=0
|
|
for __16b in ${1%%/*}; do
|
|
if [ ${__c} -lt 7 ]; then
|
|
printf "${__16b}:"
|
|
else
|
|
printf "abcd\n" && break
|
|
fi
|
|
__c=$((__c + 1))
|
|
done
|
|
unset IFS
|
|
}
|
|
|
|
ndp_setup() {
|
|
sysctl -w net.ipv6.conf.all.proxy_ndp=1
|
|
ip -6 neigh add proxy "${1}" dev "$(ipv6_dev)"
|
|
}
|
|
|
|
ip netns del passt 2>/dev/null || :
|
|
ip link del veth_passt 2>/dev/null || :
|
|
ip netns add passt
|
|
ip link add veth_passt up netns passt type veth peer name veth_passt
|
|
ip link set dev veth_passt up
|
|
|
|
ip -n passt addr add 192.0.2.2/24 dev veth_passt
|
|
ip addr add 192.0.2.1/24 dev veth_passt
|
|
ip -n passt route add default via 192.0.2.1
|
|
|
|
ipv6_addr="$(ipv6_devaddr "$(ipv6_dev)")"
|
|
ipv6_passt="$(ipv6_mangle "${ipv6_addr}")"
|
|
ndp_setup "${ipv6_passt}"
|
|
ip -n passt addr add "${ipv6_passt}/$(ipv6_mask "${ipv6_addr}")" dev veth_passt
|
|
ip addr add "${ipv6_addr}" dev veth_passt
|
|
passt_ll="$(ipv6_ll_addr "veth_passt")"
|
|
main_ll="$(get_token "link/ether" $(ip -o li sh veth_passt))"
|
|
ip -n passt neigh add "${passt_ll%%/*}" dev veth_passt lladdr "${main_ll}"
|
|
ip -n passt route add default via "${passt_ll%%/*}" dev veth_passt
|
|
|
|
ethtool -K veth_passt tx off
|
|
ip netns exec passt ethtool -K veth_passt tx off
|
|
ulimit -n 300000
|
|
|
|
ip netns exec passt ./passt
|