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jool: add Jool-based CLAT netifd proto #29070
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,286 @@ | ||
| #!/bin/sh | ||
| # | ||
| # netifd proto helper for 464XLAT CLAT using Jool SIIT in a network namespace. | ||
| JOOL_DEFAULT_VETH_HOST_V4="192.0.2.0" | ||
| JOOL_DEFAULT_VETH_NS_V4="192.0.2.1" | ||
|
|
||
| [ -n "$INCLUDE_ONLY" ] || { | ||
| . /lib/functions.sh | ||
| . ../netifd-proto.sh | ||
| init_proto "$@" | ||
| } | ||
|
|
||
| jool_clat_proto_log() { | ||
| local cfg="$1" | ||
| shift | ||
|
|
||
| logger -t "jool-clat-proto[$cfg]" -- "$*" | ||
| } | ||
|
|
||
| jool_clat_proto_fail() { | ||
| local cfg="$1" | ||
| local code="$2" | ||
| shift 2 | ||
|
|
||
| [ "$#" -gt 0 ] && jool_clat_proto_log "$cfg" "$*" | ||
| proto_notify_error "$cfg" "$code" | ||
| proto_block_restart "$cfg" | ||
| proto_setup_failed "$cfg" | ||
| return 1 | ||
| } | ||
|
|
||
| jool_clat_proto_wait_linklocal() { | ||
| local netns="$1" | ||
| local ifname="$2" | ||
| local addr tries=0 | ||
|
|
||
| while [ "$tries" -lt 5 ]; do | ||
| if [ -n "$netns" ]; then | ||
| addr="$(ip netns exec "$netns" ip -6 -o addr show scope link dev "$ifname" | awk '$0 !~ / tentative( |$)/ { print $4; exit }' | cut -d/ -f1)" | ||
| else | ||
| addr="$(ip -6 -o addr show scope link dev "$ifname" | awk '$0 !~ / tentative( |$)/ { print $4; exit }' | cut -d/ -f1)" | ||
| fi | ||
| [ -n "$addr" ] && { | ||
| echo "$addr" | ||
| return 0 | ||
| } | ||
|
|
||
| tries=$((tries + 1)) | ||
| sleep 1 | ||
| done | ||
|
|
||
| return 1 | ||
| } | ||
|
|
||
| jool_clat_proto_word_count() { | ||
| local count=0 | ||
| local word | ||
|
|
||
| for word in $1; do | ||
| count=$((count + 1)) | ||
| done | ||
|
|
||
| echo "$count" | ||
| } | ||
|
|
||
| jool_clat_proto_run() { | ||
| local cfg="$1" | ||
| local message="$2" | ||
| shift 2 | ||
|
|
||
| "$@" || { | ||
| jool_clat_proto_log "$cfg" "$message" | ||
| return 1 | ||
| } | ||
| } | ||
|
|
||
| jool_clat_proto_cleanup() { | ||
| local cfg="$1" | ||
| local veth_host_ifname="$2" | ||
| local netns="$3" | ||
|
|
||
| [ -n "$netns" ] && ip netns exec "$netns" jool_siit instance remove >/dev/null 2>&1 | ||
| [ -n "$netns" ] && ip netns del "$netns" >/dev/null 2>&1 | ||
| [ -n "$veth_host_ifname" ] && ip link del dev "$veth_host_ifname" >/dev/null 2>&1 | ||
| } | ||
|
|
||
| jool_clat_proto_setup_instance() { | ||
| local cfg="$1" | ||
| local plat_prefix="$2" | ||
| local veth_host_v4="$3" | ||
| local veth_ns_v4="$4" | ||
| local veth_host_ifname="$5" | ||
| local veth_ns_ifname="$6" | ||
| local netns="$7" | ||
| local clat_v4="$8" | ||
| local clat_v6="$9" | ||
| local veth_host_v6 veth_ns_v6 veth_host_mac veth_ns_mac | ||
| local prefix4 prefix6 | ||
|
|
||
| # Ref: https://blog.lingxh.com/post/464xlat/ | ||
| # https://www.jool.mx/en/464xlat.html | ||
|
|
||
| # Set up netns and veth pair. | ||
| jool_clat_proto_run "$cfg" "failed to create namespace '$netns'" \ | ||
| ip netns add "$netns" || return 1 | ||
| jool_clat_proto_run "$cfg" "failed to create veth pair '$veth_host_ifname'/'$veth_ns_ifname'" \ | ||
| ip link add name "$veth_host_ifname" type veth peer name "$veth_ns_ifname" || return 1 | ||
| jool_clat_proto_run "$cfg" "failed to move '$veth_ns_ifname' into '$netns'" \ | ||
| ip link set dev "$veth_ns_ifname" netns "$netns" || return 1 | ||
| # Bring the host veth up now so we can learn its link-local address before | ||
| # handing the interface to netifd. | ||
| jool_clat_proto_run "$cfg" "failed to bring up '$veth_host_ifname'" \ | ||
| ip link set dev "$veth_host_ifname" up || return 1 | ||
| jool_clat_proto_run "$cfg" "failed to bring up loopback in '$netns'" \ | ||
| ip netns exec "$netns" ip link set dev lo up || return 1 | ||
| jool_clat_proto_run "$cfg" "failed to bring up '$veth_ns_ifname' in '$netns'" \ | ||
| ip netns exec "$netns" ip link set dev "$veth_ns_ifname" up || return 1 | ||
|
|
||
| veth_host_v6="$(jool_clat_proto_wait_linklocal "" "$veth_host_ifname")" || { | ||
| jool_clat_proto_log "$cfg" "failed to discover link-local IPv6 on '$veth_host_ifname'" | ||
| return 1 | ||
| } | ||
| veth_ns_v6="$(jool_clat_proto_wait_linklocal "$netns" "$veth_ns_ifname")" || { | ||
| jool_clat_proto_log "$cfg" "failed to discover link-local IPv6 on '$veth_ns_ifname'" | ||
| return 1 | ||
| } | ||
|
|
||
| veth_host_mac="$(cat "/sys/class/net/$veth_host_ifname/address")" || { | ||
| jool_clat_proto_log "$cfg" "failed to read MAC address for '$veth_host_ifname'" | ||
| return 1 | ||
| } | ||
| veth_ns_mac="$(ip netns exec "$netns" cat "/sys/class/net/$veth_ns_ifname/address")" || { | ||
| jool_clat_proto_log "$cfg" "failed to read MAC address for '$veth_ns_ifname' in '$netns'" | ||
| return 1 | ||
| } | ||
|
|
||
| # Prepopulate the namespace-side neighbor entry to avoid relying on ARP | ||
| # and NDP, which may require extra firewall rules to work. | ||
| # The host-side neighbor entries are populated later via proto_add_ipv[46]_neighbor. | ||
| jool_clat_proto_run "$cfg" "failed to populate namespace IPv6 neighbor entry for '$veth_host_v6'" \ | ||
| ip netns exec "$netns" ip -6 neigh replace "$veth_host_v6" lladdr "$veth_host_mac" dev "$veth_ns_ifname" nud permanent || return 1 | ||
| jool_clat_proto_run "$cfg" "failed to populate namespace IPv4 neighbor entry for '$veth_host_v4'" \ | ||
| ip netns exec "$netns" ip -4 neigh replace "$veth_host_v4" lladdr "$veth_host_mac" dev "$veth_ns_ifname" nud permanent || return 1 | ||
| jool_clat_proto_run "$cfg" "failed to assign '$veth_ns_v4' peer '$veth_host_v4' on '$veth_ns_ifname'" \ | ||
| ip netns exec "$netns" ip addr add "$veth_ns_v4" peer "$veth_host_v4" dev "$veth_ns_ifname" || return 1 | ||
| # Route translated 4to6 traffic back to the host, where it is expected to be | ||
| # routed toward the PLAT. | ||
| jool_clat_proto_run "$cfg" "failed to install namespace default route" \ | ||
| ip netns exec "$netns" ip -6 route replace default via "$veth_host_v6" dev "$veth_ns_ifname" || return 1 | ||
|
|
||
| # Route translated 6to4 return traffic back to the host. | ||
| for prefix4 in $clat_v4; do | ||
| [ "$prefix4" = "$veth_host_v4" ] && continue | ||
| jool_clat_proto_run "$cfg" "failed to install namespace route for '$prefix4'" \ | ||
| ip netns exec "$netns" ip route replace "$prefix4" via "$veth_host_v4" dev "$veth_ns_ifname" || return 1 | ||
| done | ||
|
|
||
| jool_clat_proto_run "$cfg" "failed to enable namespace IPv4 forwarding" \ | ||
| ip netns exec "$netns" sysctl -q -w net.ipv4.conf.all.forwarding=1 || return 1 | ||
| jool_clat_proto_run "$cfg" "failed to enable namespace IPv6 forwarding" \ | ||
| ip netns exec "$netns" sysctl -q -w net.ipv6.conf.all.forwarding=1 || return 1 | ||
|
|
||
| jool_clat_proto_run "$cfg" "failed to create jool_siit instance in '$netns'" \ | ||
| ip netns exec "$netns" jool_siit instance add --netfilter --pool6 "$plat_prefix" || return 1 | ||
|
|
||
| # Prefix counts are validated earlier, so each IPv4 prefix maps to the | ||
| # next IPv6 prefix in order. | ||
| set -- $clat_v6 | ||
| for prefix4 in $clat_v4; do | ||
| prefix6="$1" | ||
| shift | ||
| jool_clat_proto_run "$cfg" "failed to map '$prefix4' to '$prefix6'" \ | ||
| ip netns exec "$netns" jool_siit eamt add --force "$prefix4" "$prefix6" || return 1 | ||
| done | ||
|
|
||
| # Prevent Jool SIIT from capturing INPUT traffic toward the ns veth itself | ||
| # (e.g. ping for test). | ||
| jool_clat_proto_run "$cfg" "failed to add denylist" \ | ||
| ip netns exec "$netns" jool_siit denylist4 add "${veth_ns_v4}" || return 1 | ||
|
|
||
| JOOL_CLAT_VETH_NS_V6="$veth_ns_v6" | ||
| JOOL_CLAT_VETH_NS_MAC="$veth_ns_mac" | ||
| return 0 | ||
| } | ||
|
|
||
| proto_jool_clat_init_config() { | ||
| available=1 | ||
| no_device=1 | ||
|
|
||
| proto_config_add_string "plat_prefix" | ||
| proto_config_add_array "clat_v4:list(string)" | ||
| proto_config_add_array "clat_v6:list(string)" | ||
| proto_config_add_string "veth_host_v4" | ||
| proto_config_add_string "veth_ns_v4" | ||
| proto_config_add_string "veth_host_ifname" | ||
| proto_config_add_string "veth_ns_ifname" | ||
| proto_config_add_string "netns" | ||
| proto_config_add_boolean "defaultroute" | ||
| proto_config_add_int "metric" | ||
| } | ||
|
|
||
| proto_jool_clat_setup() { | ||
| local cfg="$1" | ||
| local plat_prefix veth_host_v4 veth_ns_v4 veth_host_ifname veth_ns_ifname netns defaultroute metric | ||
| local clat_v4 clat_v6 | ||
| local prefix_count4 prefix_count6 prefix6 | ||
|
|
||
| json_get_vars plat_prefix veth_host_v4 veth_ns_v4 veth_host_ifname veth_ns_ifname netns defaultroute metric | ||
| json_get_values clat_v4 clat_v4 | ||
| json_get_values clat_v6 clat_v6 | ||
|
|
||
| [ -n "$plat_prefix" ] || { | ||
| jool_clat_proto_fail "$cfg" MISSING_PLAT_PREFIX "missing required option plat_prefix" | ||
| return 1 | ||
| } | ||
| veth_host_v4="${veth_host_v4:-$JOOL_DEFAULT_VETH_HOST_V4}" | ||
| veth_ns_v4="${veth_ns_v4:-$JOOL_DEFAULT_VETH_NS_V4}" | ||
|
|
||
| veth_host_ifname="${veth_host_ifname:-veth-$cfg}" | ||
| veth_ns_ifname="${veth_ns_ifname:-$veth_host_ifname-peer}" | ||
| netns="${netns:-ns-$cfg}" | ||
| defaultroute="${defaultroute:-1}" | ||
| clat_v4="${clat_v4:-$veth_host_v4}" | ||
|
|
||
| prefix_count6="$(jool_clat_proto_word_count "$clat_v6")" | ||
| [ "$prefix_count6" -gt 0 ] || { | ||
| jool_clat_proto_fail "$cfg" MISSING_CLAT_V6 "at least one clat_v6 is required" | ||
| return 1 | ||
| } | ||
|
|
||
| prefix_count4="$(jool_clat_proto_word_count "$clat_v4")" | ||
| [ "$prefix_count4" -eq "$prefix_count6" ] || { | ||
| jool_clat_proto_fail "$cfg" PREFIX_COUNT_MISMATCH "clat_v4 and clat_v6 must have the same number of entries" | ||
| return 1 | ||
| } | ||
|
|
||
| if [ -e "/sys/class/net/$veth_host_ifname" ]; then | ||
| jool_clat_proto_fail "$cfg" HOST_IF_EXISTS "host interface '$veth_host_ifname' already exists" | ||
| return 1 | ||
| fi | ||
| if ip netns list | awk '{ print $1 }' | grep -Fxq "$netns"; then | ||
| jool_clat_proto_fail "$cfg" NETNS_EXISTS "network namespace '$netns' already exists" | ||
| return 1 | ||
| fi | ||
|
|
||
| modprobe jool_siit >/dev/null 2>&1 | ||
| [ -x /usr/bin/jool_siit ] || { | ||
| jool_clat_proto_fail "$cfg" MISSING_BINARY "missing /usr/bin/jool_siit" | ||
| return 1 | ||
| } | ||
|
|
||
| jool_clat_proto_setup_instance \ | ||
| "$cfg" "$plat_prefix" "$veth_host_v4" "$veth_ns_v4" "$veth_host_ifname" "$veth_ns_ifname" \ | ||
| "$netns" "$clat_v4" "$clat_v6" || { | ||
| jool_clat_proto_cleanup "$cfg" "$veth_host_ifname" "$netns" | ||
| jool_clat_proto_fail "$cfg" SETUP_FAILED "setup failed; see logread for details" | ||
| return 1 | ||
| } | ||
|
|
||
| proto_init_update "$veth_host_ifname" 1 | ||
| proto_add_ipv4_address "$veth_host_v4" "" "" "$veth_ns_v4" | ||
| [ "$defaultroute" = 0 ] || proto_add_ipv4_route "0.0.0.0" 0 "$veth_ns_v4" "" "$metric" | ||
| proto_add_ipv4_neighbor "$veth_ns_v4" "$JOOL_CLAT_VETH_NS_MAC" | ||
| proto_add_ipv6_neighbor "$JOOL_CLAT_VETH_NS_V6" "$JOOL_CLAT_VETH_NS_MAC" | ||
|
|
||
| for prefix6 in $clat_v6; do | ||
| proto_add_ipv6_route "${prefix6%/*}" "${prefix6#*/}" "$JOOL_CLAT_VETH_NS_V6" | ||
| done | ||
|
|
||
| proto_send_update "$cfg" | ||
| } | ||
|
|
||
| proto_jool_clat_teardown() { | ||
| local cfg="$1" | ||
| local veth_host_ifname netns | ||
|
|
||
| json_get_vars veth_host_ifname netns | ||
| veth_host_ifname="${veth_host_ifname:-veth-$cfg}" | ||
| netns="${netns:-ns-$cfg}" | ||
|
|
||
| jool_clat_proto_cleanup "$cfg" "$veth_host_ifname" "$netns" | ||
| } | ||
|
|
||
| [ -n "$INCLUDE_ONLY" ] || { | ||
| add_protocol jool_clat | ||
| } | ||
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