blob: 4bde9d066c4616430533cef02e32d295b0329b11 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
#!/bin/bash
#
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Jesper Dangaard Brouer, Red Hat Inc.
#
# Bash-shell example on using iproute2 tools 'tc' and 'ip' to load
# eBPF programs, both for XDP and clsbpf. Shell script function
# wrappers and even long options parsing is illustrated, for ease of
# use.
#
# Related to sample/bpf/xdp2skb_meta_kern.c, which contains BPF-progs
# that need to collaborate between XDP and TC hooks. Thus, it is
# convenient that the same tool load both programs that need to work
# together.
#
BPF_FILE=xdp2skb_meta_kern.o
DIR=$(dirname $0)
[ -z "$TC" ] && TC=tc
[ -z "$IP" ] && IP=ip
function usage() {
echo ""
echo "Usage: $0 [-vfh] --dev ethX"
echo " -d | --dev : Network device (required)"
echo " --flush : Cleanup flush TC and XDP progs"
echo " --list : (\$LIST) List TC and XDP progs"
echo " -v | --verbose : (\$VERBOSE) Verbose"
echo " --dry-run : (\$DRYRUN) Dry-run only (echo commands)"
echo ""
}
## -- General shell logging cmds --
function err() {
local exitcode=$1
shift
echo "ERROR: $@" >&2
exit $exitcode
}
function info() {
if [[ -n "$VERBOSE" ]]; then
echo "# $@"
fi
}
## -- Helper function calls --
# Wrapper call for TC and IP
# - Will display the offending command on failure
function _call_cmd() {
local cmd="$1"
local allow_fail="$2"
shift 2
if [[ -n "$VERBOSE" ]]; then
echo "$cmd $@"
fi
if [[ -n "$DRYRUN" ]]; then
return
fi
$cmd "$@"
local status=$?
if (( $status != 0 )); then
if [[ "$allow_fail" == "" ]]; then
err 2 "Exec error($status) occurred cmd: \"$cmd $@\""
fi
fi
}
function call_tc() {
_call_cmd "$TC" "" "$@"
}
function call_tc_allow_fail() {
_call_cmd "$TC" "allow_fail" "$@"
}
function call_ip() {
_call_cmd "$IP" "" "$@"
}
## --- Parse command line arguments / parameters ---
# Using external program "getopt" to get --long-options
OPTIONS=$(getopt -o vfhd: \
--long verbose,flush,help,list,dev:,dry-run -- "$@")
if (( $? != 0 )); then
err 4 "Error calling getopt"
fi
eval set -- "$OPTIONS"
unset DEV
unset FLUSH
while true; do
case "$1" in
-d | --dev ) # device
DEV=$2
info "Device set to: DEV=$DEV" >&2
shift 2
;;
-v | --verbose)
VERBOSE=yes
# info "Verbose mode: VERBOSE=$VERBOSE" >&2
shift
;;
--dry-run )
DRYRUN=yes
VERBOSE=yes
info "Dry-run mode: enable VERBOSE and don't call TC+IP" >&2
shift
;;
-f | --flush )
FLUSH=yes
shift
;;
--list )
LIST=yes
shift
;;
-- )
shift
break
;;
-h | --help )
usage;
exit 0
;;
* )
shift
break
;;
esac
done
FILE="$DIR/$BPF_FILE"
if [[ ! -e $FILE ]]; then
err 3 "Missing BPF object file ($FILE)"
fi
if [[ -z $DEV ]]; then
usage
err 2 "Please specify network device -- required option --dev"
fi
## -- Function calls --
function list_tc()
{
local device="$1"
shift
info "Listing current TC ingress rules"
call_tc filter show dev $device ingress
}
function list_xdp()
{
local device="$1"
shift
info "Listing current XDP device($device) setting"
call_ip link show dev $device | grep --color=auto xdp
}
function flush_tc()
{
local device="$1"
shift
info "Flush TC on device: $device"
call_tc_allow_fail filter del dev $device ingress
call_tc_allow_fail qdisc del dev $device clsact
}
function flush_xdp()
{
local device="$1"
shift
info "Flush XDP on device: $device"
call_ip link set dev $device xdp off
}
function attach_tc_mark()
{
local device="$1"
local file="$2"
local prog="tc_mark"
shift 2
# Re-attach clsact to clear/flush existing role
call_tc_allow_fail qdisc del dev $device clsact 2> /dev/null
call_tc qdisc add dev $device clsact
# Attach BPF prog
call_tc filter add dev $device ingress \
prio 1 handle 1 bpf da obj $file sec $prog
}
function attach_xdp_mark()
{
local device="$1"
local file="$2"
local prog="xdp_mark"
shift 2
# Remove XDP prog in-case it's already loaded
# TODO: Need ip-link option to override/replace existing XDP prog
flush_xdp $device
# Attach XDP/BPF prog
call_ip link set dev $device xdp obj $file sec $prog
}
if [[ -n $FLUSH ]]; then
flush_tc $DEV
flush_xdp $DEV
exit 0
fi
if [[ -n $LIST ]]; then
list_tc $DEV
list_xdp $DEV
exit 0
fi
attach_tc_mark $DEV $FILE
attach_xdp_mark $DEV $FILE
|
