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![Taeung Song](/assets/img/avatar_default.png)
The below path error can occur:
# ./xdp2skb_meta.sh --dev eth0 --list
./xdp2skb_meta.sh: line 61: /usr/sbin/tc: No such file or directory
So just use command names instead of absolute paths of tc and ip.
In addition, it allow callers to redefine $TC and $IP paths
Fixes: 36e04a2d78
("samples/bpf: xdp2skb_meta shows transferring info from XDP to SKB")
Reviewed-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
220 lines
4.5 KiB
Bash
Executable file
220 lines
4.5 KiB
Bash
Executable file
#!/bin/bash
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#
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (c) 2018 Jesper Dangaard Brouer, Red Hat Inc.
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#
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# Bash-shell example on using iproute2 tools 'tc' and 'ip' to load
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# eBPF programs, both for XDP and clsbpf. Shell script function
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# wrappers and even long options parsing is illustrated, for ease of
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# use.
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#
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# Related to sample/bpf/xdp2skb_meta_kern.c, which contains BPF-progs
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# that need to collaborate between XDP and TC hooks. Thus, it is
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# convenient that the same tool load both programs that need to work
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# together.
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#
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BPF_FILE=xdp2skb_meta_kern.o
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DIR=$(dirname $0)
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[ -z "$TC" ] && TC=tc
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[ -z "$IP" ] && IP=ip
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function usage() {
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echo ""
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echo "Usage: $0 [-vfh] --dev ethX"
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echo " -d | --dev : Network device (required)"
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echo " --flush : Cleanup flush TC and XDP progs"
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echo " --list : (\$LIST) List TC and XDP progs"
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echo " -v | --verbose : (\$VERBOSE) Verbose"
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echo " --dry-run : (\$DRYRUN) Dry-run only (echo commands)"
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echo ""
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}
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## -- General shell logging cmds --
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function err() {
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local exitcode=$1
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shift
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echo "ERROR: $@" >&2
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exit $exitcode
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}
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function info() {
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if [[ -n "$VERBOSE" ]]; then
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echo "# $@"
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fi
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}
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## -- Helper function calls --
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# Wrapper call for TC and IP
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# - Will display the offending command on failure
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function _call_cmd() {
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local cmd="$1"
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local allow_fail="$2"
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shift 2
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if [[ -n "$VERBOSE" ]]; then
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echo "$cmd $@"
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fi
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if [[ -n "$DRYRUN" ]]; then
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return
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fi
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$cmd "$@"
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local status=$?
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if (( $status != 0 )); then
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if [[ "$allow_fail" == "" ]]; then
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err 2 "Exec error($status) occurred cmd: \"$cmd $@\""
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fi
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fi
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}
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function call_tc() {
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_call_cmd "$TC" "" "$@"
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}
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function call_tc_allow_fail() {
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_call_cmd "$TC" "allow_fail" "$@"
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}
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function call_ip() {
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_call_cmd "$IP" "" "$@"
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}
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## --- Parse command line arguments / parameters ---
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# Using external program "getopt" to get --long-options
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OPTIONS=$(getopt -o vfhd: \
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--long verbose,flush,help,list,dev:,dry-run -- "$@")
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if (( $? != 0 )); then
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err 4 "Error calling getopt"
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fi
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eval set -- "$OPTIONS"
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unset DEV
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unset FLUSH
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while true; do
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case "$1" in
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-d | --dev ) # device
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DEV=$2
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info "Device set to: DEV=$DEV" >&2
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shift 2
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;;
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-v | --verbose)
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VERBOSE=yes
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# info "Verbose mode: VERBOSE=$VERBOSE" >&2
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shift
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;;
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--dry-run )
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DRYRUN=yes
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VERBOSE=yes
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info "Dry-run mode: enable VERBOSE and don't call TC+IP" >&2
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shift
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;;
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-f | --flush )
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FLUSH=yes
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shift
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;;
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--list )
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LIST=yes
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shift
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;;
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-- )
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shift
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break
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;;
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-h | --help )
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usage;
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exit 0
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;;
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* )
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shift
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break
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;;
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esac
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done
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FILE="$DIR/$BPF_FILE"
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if [[ ! -e $FILE ]]; then
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err 3 "Missing BPF object file ($FILE)"
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fi
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if [[ -z $DEV ]]; then
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usage
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err 2 "Please specify network device -- required option --dev"
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fi
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## -- Function calls --
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function list_tc()
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{
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local device="$1"
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shift
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info "Listing current TC ingress rules"
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call_tc filter show dev $device ingress
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}
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function list_xdp()
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{
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local device="$1"
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shift
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info "Listing current XDP device($device) setting"
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call_ip link show dev $device | grep --color=auto xdp
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}
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function flush_tc()
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{
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local device="$1"
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shift
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info "Flush TC on device: $device"
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call_tc_allow_fail filter del dev $device ingress
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call_tc_allow_fail qdisc del dev $device clsact
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}
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function flush_xdp()
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{
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local device="$1"
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shift
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info "Flush XDP on device: $device"
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call_ip link set dev $device xdp off
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}
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function attach_tc_mark()
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{
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local device="$1"
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local file="$2"
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local prog="tc_mark"
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shift 2
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# Re-attach clsact to clear/flush existing role
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call_tc_allow_fail qdisc del dev $device clsact 2> /dev/null
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call_tc qdisc add dev $device clsact
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# Attach BPF prog
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call_tc filter add dev $device ingress \
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prio 1 handle 1 bpf da obj $file sec $prog
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}
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function attach_xdp_mark()
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{
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local device="$1"
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local file="$2"
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local prog="xdp_mark"
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shift 2
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# Remove XDP prog in-case it's already loaded
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# TODO: Need ip-link option to override/replace existing XDP prog
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flush_xdp $device
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# Attach XDP/BPF prog
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call_ip link set dev $device xdp obj $file sec $prog
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}
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if [[ -n $FLUSH ]]; then
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flush_tc $DEV
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flush_xdp $DEV
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exit 0
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fi
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if [[ -n $LIST ]]; then
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list_tc $DEV
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list_xdp $DEV
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exit 0
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fi
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attach_tc_mark $DEV $FILE
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attach_xdp_mark $DEV $FILE
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