5ec9ad7e9d
There's no reason to limit the MTU here to any lower value. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
123 lines
3.3 KiB
Bash
Executable file
123 lines
3.3 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 ro show default); }
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ipv6_devaddr() { get_token "inet6" $(ip -o -6 ad sh dev "${1}" scope global); }
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ipv6_ll_addr() { get_token "inet6" $(ip -o -6 ad sh dev "${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" $(ip -o li sh "veth_${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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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 | cat
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