net-firewall/nftables: refactor init.d/nftables into libexec/nftable.sh

Package-Manager: portage-2.2.23

1 files changed, 150 insertions, 0 deletions

diff --git a/net-firewall/nftables/files/libexec/nftables.sh b/net-firewall/nftables/files/libexec/nftables.sh
new file mode 100755
index 000000000000..0d7c091d07f4
--- /dev/null
+++ b/net-firewall/nftables/files/libexec/nftables.sh
@@ -0,0 +1,150 @@
+#! /bin/sh
+
+main() {
+    local NFTABLES_SAVE=${2:-'/var/lib/nftables/rules-save'}
+    local retval
+    case "$1" in
+        "clear")
+            if ! use_legacy; then
+                nft flush ruleset
+            else
+                clear_legacy
+            fi
+            retval=$?
+        ;;
+        "list")
+            if ! use_legacy; then
+                nft list ruleset
+            else
+                list_legacy
+            fi
+            retval=$?
+        ;;
+        "load")
+            nft -f ${NFTABLES_SAVE}
+            retval=$?
+        ;;
+        "store")
+            local tmp_save="${NFTABLES_SAVE}.tmp"
+            if ! use_legacy; then
+                nft list ruleset > ${tmp_save}
+            else
+                save_legacy ${tmp_save}
+            fi
+            retval=$?
+            if [ ${retval} ]; then
+                mv ${tmp_save} ${NFTABLES_SAVE}
+            fi
+        ;;
+    esac
+    return ${retval}
+}
+
+clear_legacy() {
+    local l3f line table chain first_line
+
+    first_line=1
+    if manualwalk; then
+        for l3f in $(getfamilies); do
+            nft list tables ${l3f} | while read line; do
+                table=$(echo ${line} | sed "s/table[ \t]*//")
+                deletetable ${l3f} ${table}
+            done
+        done
+    else
+        nft list tables | while read line; do
+            l3f=$(echo ${line} | cut -d ' ' -f2)
+            table=$(echo ${line} | cut -d ' ' -f3)
+            deletetable ${l3f} ${table}
+        done
+    fi
+}
+
+list_legacy() {
+    local l3f
+
+    if manualwalk; then
+        for l3f in $(getfamilies); do
+            nft list tables ${l3f} | while read line; do
+                line=$(echo ${line} | sed "s/table/table ${l3f}/")
+                echo "$(nft list ${line})"
+            done
+        done
+    else
+        nft list tables | while read line; do
+            echo "$(nft list ${line})"
+        done
+    fi
+}
+
+save_legacy() {
+    tmp_save=$1
+    touch "${tmp_save}"
+    if manualwalk; then
+        for l3f in $(getfamilies); do
+            nft list tables ${l3f} | while read line; do
+                line=$(echo ${line} | sed "s/table/table ${l3f}/")
+                nft ${SAVE_OPTIONS} list ${line} >> ${tmp_save}
+            done
+        done
+    else
+        nft list tables | while read line; do
+            nft ${SAVE_OPTIONS} list ${line} >> "${tmp_save}"
+        done
+    fi
+}
+
+use_legacy() {
+    local major_ver minor_ver
+
+    major_ver=$(uname -r | cut -d '.' -f1)
+    minor_ver=$(uname -r | cut -d '.' -f2)
+
+    [[ $major_ver -ge 4 || $major_ver -eq 3 && $minor_ver -ge 18 ]] && return 1
+    return 0
+}
+
+CHECK_TABLE_NAME="GENTOO_CHECK_TABLE"
+
+getfamilies() {
+    local l3f families
+
+    for l3f in ip arp ip6 bridge inet; do
+        if nft create table ${l3f} ${CHECK_TABLE_NAME} > /dev/null 2>&1; then
+            families="${families}${l3f} "
+            nft delete table ${l3f} ${CHECK_TABLE_NAME}
+        fi
+    done
+    echo ${families}
+}
+
+manualwalk() {
+    local result l3f=`getfamilies | cut -d ' ' -f1`
+
+    nft create table ${l3f} ${CHECK_TABLE_NAME}
+    nft list tables | read line
+    if [ $(echo $line | wc -w) -lt 3 ]; then
+        result=0
+    fi
+    result=1
+    nft delete table ${l3f} ${CHECK_TABLE_NAME}
+
+    return $result
+}
+
+deletetable() {
+    # family is $1
+    # table name is $2
+    nft flush table $1 $2
+    nft list table $1 $2 | while read l; do
+        chain=$(echo $l | grep -o 'chain [^[:space:]]\+' | cut -d ' ' -f2)
+        if [ -n "${chain}" ]; then
+            nft flush chain $1 $2 ${chain}
+            nft delete chain $1 $2 ${chain}
+        fi
+    done
+    nft delete table $1 $2
+}
+
+main "$@"
+exit $?