mirror of
https://passt.top/passt
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2320ac3349
ip(8)'s ability to take abbreviated arguments (e.g. "li sh" instead of "link show") is very handy when using it interactively, but it doesn't make for very readable scripts and examples when shown that way. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
126 lines
3.5 KiB
Bash
Executable File
126 lines
3.5 KiB
Bash
Executable File
#!/bin/sh -e
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#
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# SPDX-License-Identifier: AGPL-3.0-or-later
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#
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# PASST - Plug A Simple Socket Transport
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#
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# demo.sh - Set up namespaces, addresses and routes to show PASST functionality
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#
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# Copyright (c) 2020-2021 Red Hat GmbH
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# Author: Stefano Brivio <sbrivio@redhat.com>
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get_token() {
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IFS=' '
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__next=0
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for __token in ${@}; do
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[ ${__next} -eq 2 ] && echo "${__token}" && return
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[ "${__token}" = "${1}" ] && __next=$((__next + 1))
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done
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unset IFS
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}
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ipv6_dev() { get_token "dev" $(ip -o -6 route show default | grep via); }
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ipv6_devaddr() { get_token "inet6" $(ip -o -6 addr show dev "${1}" scope global); }
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ipv6_ll_addr() { get_token "inet6" $(ip -o -6 addr show dev "${1}" scope link); }
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ipv6_mask() { echo ${1#*/}; }
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ipv6_mangle() {
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IFS=':'
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__c=0
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for __16b in ${1%%/*}; do
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if [ ${__c} -lt 7 ]; then
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printf "${__16b}:"
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else
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printf "%04x\n" $((0xabc0 + ${2})) && break
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fi
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__c=$((__c + 1))
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done
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unset IFS
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}
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ndp_setup() {
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sysctl -w net.ipv6.conf.all.proxy_ndp=1
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ip -6 neigh add proxy "${1}" dev "$(ipv6_dev)"
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for i in `seq 1 63`; do
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__neigh="$(ipv6_mangle ${1} ${i})"
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if [ "${__neigh}" != "${1}" ]; then
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ip -6 neigh add proxy "${__neigh}" dev "${2}"
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fi
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done
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}
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ns_idx=0
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for i in `seq 1 63`; do
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ns="passt_${i}"
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ns_idx=${i}
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busy=0
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for p in $(pidof passt); do
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[ "$(ip netns identify ${p})" = "${ns}" ] && busy=1 && break
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done
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[ ${busy} -eq 0 ] && break
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done
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[ ${busy} -ne 0 ] && echo "Couldn't create namespace" && exit 1
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ip netns del "${ns}" 2>/dev/null || :
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ip netns add "${ns}"
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ip link del "veth_${ns}" 2>/dev/null || :
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ip link add "veth_${ns}" up netns "${ns}" type veth peer name "veth_${ns}"
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ip link set dev "veth_${ns}" up
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ip link set dev "veth_${ns}" mtu 65535
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ip -n "${ns}" link set dev "veth_${ns}" mtu 65535
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ip -n "${ns}" link set dev lo up
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ipv4_main="192.0.2.$(((ns_idx - 1) * 4 + 1))"
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ipv4_ns="192.0.2.$(((ns_idx - 1) * 4 + 2))"
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ip -n "${ns}" addr add "${ipv4_ns}/30" dev "veth_${ns}"
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ip addr add "${ipv4_main}/30" dev "veth_${ns}"
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ip -n "${ns}" route add default via "${ipv4_main}"
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sysctl -w net.ipv4.ip_forward=1
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nft delete table "${ns}_nat" 2>/dev/null || :
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nft add table "${ns}_nat"
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nft add chain "${ns}_nat" postrouting '{ type nat hook postrouting priority -100 ; }'
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nft add rule "${ns}_nat" postrouting ip saddr "${ipv4_ns}" masquerade
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ipv6_addr="$(ipv6_devaddr "$(ipv6_dev)")"
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if [ -n "${ipv6_addr}" ]; then
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ipv6_passt="$(ipv6_mangle "${ipv6_addr}" ${ns_idx})"
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ndp_setup "${ipv6_passt}" "veth_${ns}"
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ip -n "${ns}" addr add "${ipv6_passt}/$(ipv6_mask "${ipv6_addr}")" dev "veth_${ns}"
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ip addr add "${ipv6_addr}" dev "veth_${ns}"
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ip route add "${ipv6_passt}" dev "veth_${ns}"
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passt_ll="$(ipv6_ll_addr "veth_${ns}")"
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main_ll="$(get_token "link/ether" $(ip -o link show "veth_${ns}"))"
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ip neigh add "${passt_ll%%/*}" dev "veth_${ns}" lladdr "${main_ll}"
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ip -n "${ns}" route add default via "${passt_ll%%/*}" dev "veth_${ns}"
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sysctl -w net.ipv6.conf.all.forwarding=1
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else
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ipv6_passt=
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fi
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ethtool -K "veth_${ns}" tx off
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ip netns exec "${ns}" ethtool -K "veth_${ns}" tx off
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ip netns exec "${ns}" sysctl -w net.ipv4.ping_group_range="0 2147483647"
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sysctl -w net.core.rmem_max=16777216
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sysctl -w net.core.wmem_max=16777216
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sysctl -w net.core.rmem_default=16777216
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sysctl -w net.core.wmem_default=16777216
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sysctl -w net.ipv4.tcp_rmem="16777216 131072 16777216"
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sysctl -w net.ipv4.tcp_wmem="16777216 131072 16777216"
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echo
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echo "Namespace ${ns} set up, addresses:"
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echo " ${ipv4_ns}"
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echo " ${ipv6_passt}"
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echo
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echo "Starting passt..."
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echo
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ip netns exec "${ns}" ./passt -f -e -t all -u all
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