/
weave
executable file
·2122 lines (1933 loc) · 68.4 KB
/
weave
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
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#!/bin/sh
set -e
[ -n "$WEAVE_DEBUG" ] && set -x
SCRIPT_VERSION="(unreleased version)"
if [ "$SCRIPT_VERSION" = "(unreleased version)" ] ; then
IMAGE_VERSION=latest
else
IMAGE_VERSION=$SCRIPT_VERSION
fi
IMAGE_VERSION=${WEAVE_VERSION:-$IMAGE_VERSION}
# - Docker versions prior to 1.6 cannot pull images from DockerHub
# - The weavexec image embeds a Docker 1.6.2 client. Docker will give
# a "client is newer than server error" if the daemon has an older
# API version, which could be confusing if the user's Docker client
# is correctly matched with that older version.
#
# We therefore check that the user's Docker *client* is >= 1.6
MIN_DOCKER_VERSION=1.6.0
# These are needed for remote execs, hence we introduce them here
DOCKERHUB_USER=${DOCKERHUB_USER:-weaveworks}
BASE_EXEC_IMAGE=$DOCKERHUB_USER/weaveexec
EXEC_IMAGE=$BASE_EXEC_IMAGE:$IMAGE_VERSION
PROXY_HOST=${PROXY_HOST:-$(echo "${DOCKER_HOST#tcp://}" | cut -s -d: -f1)}
PROXY_HOST=${PROXY_HOST:-127.0.0.1}
DOCKER_CLIENT_HOST=${DOCKER_CLIENT_HOST:-$DOCKER_HOST}
# Define some regular expressions for matching addresses.
# The regexp here is far from precise, but good enough.
IP_REGEXP="[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
CIDR_REGEXP="$IP_REGEXP/[0-9]{1,2}"
usage_no_exit() {
cat >&2 <<EOF
Usage:
weave --help | help
weave setup
weave version
weave launch [--password <password>] [--nickname <nickname>]
[--ipalloc-range <cidr> [--ipalloc-default-subnet <cidr>]]
[--no-discovery] [--init-peer-count <count>] <peer> ...
weave launch-router [--password <password>] [--nickname <nickname>]
[--ipalloc-range <cidr> [--ipalloc-default-subnet <cidr>]]
[--no-discovery] [--init-peer-count <count>] <peer> ...
weave launch-proxy [-H <endpoint>] [--with-dns | --without-dns]
[--no-default-ipalloc] [--no-rewrite-hosts]
[--hostname-from-label <labelkey>]
[--hostname-match <regexp>]
[--hostname-replacement <replacement>]
[--rewrite-inspect]
weave launch-plugin
weave env [--restore]
weave config
weave connect [--replace] [<peer> ...]
weave forget <peer> ...
weave status [targets | connections | peers | dns]
weave report [-f <format>]
weave run [--without-dns] [--no-rewrite-hosts]
[<addr> ...] <docker run args> ...
weave start [<addr> ...] <container_id>
weave attach [<addr> ...] <container_id>
weave detach [<addr> ...] <container_id>
weave dns-add [<ip_address> ...] <container_id> [-h <fqdn>] |
<ip_address> ... -h <fqdn>
weave dns-remove [<ip_address> ...] <container_id> [-h <fqdn>] |
<ip_address> ... -h <fqdn>
weave dns-lookup <unqualified_name>
weave expose [<addr> ...] [-h <fqdn>]
weave hide [<addr> ...]
weave ps [<container_id> ...]
weave stop
weave stop-router
weave stop-proxy
weave stop-plugin
weave reset
weave rmpeer <peer_id>
where <peer> = <ip_address_or_fqdn>[:<port>]
<cidr> = <ip_address>/<routing_prefix_length>
<addr> = [ip:]<cidr> | net:<cidr> | net:default
<endpoint> = [tcp://][<ip_address>]:<port> | [unix://]/path/to/socket
<peer_id> = <nickname> or weave internal peer ID
EOF
}
usage() {
usage_no_exit
exit 1
}
exec_remote() {
docker $DOCKER_CLIENT_ARGS run --rm --privileged --net=host \
-v /var/run/docker.sock:/var/run/docker.sock \
-v /proc:/hostproc \
-e PROCFS=/hostproc \
-e DOCKERHUB_USER="$DOCKERHUB_USER" \
-e WEAVE_VERSION \
-e WEAVE_DEBUG \
-e WEAVE_DOCKER_ARGS \
-e WEAVEPROXY_DOCKER_ARGS \
-e WEAVE_PASSWORD \
-e WEAVE_PORT \
-e WEAVE_CONTAINER_NAME \
-e WEAVE_MTU \
-e WEAVE_NO_FASTDP \
-e WEAVE_NO_BRIDGED_FASTDP \
-e DOCKER_BRIDGE \
-e DOCKER_CLIENT_HOST="$DOCKER_CLIENT_HOST" \
-e DOCKER_CLIENT_ARGS \
-e PROXY_HOST="$PROXY_HOST" \
-e WEAVE_CIDR=none \
-e COVERAGE \
$WEAVEEXEC_DOCKER_ARGS $EXEC_IMAGE --local "$@"
}
check_docker_version() {
if ! DOCKER_VERSION=$(docker -v | sed -n -e 's|^Docker version \([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*|\1|p') || [ -z "$DOCKER_VERSION" ] ; then
echo "ERROR: Unable to parse docker version" >&2
exit 1
fi
DOCKER_VERSION_MAJOR=$(echo "$DOCKER_VERSION" | cut -d. -f 1)
DOCKER_VERSION_MINOR=$(echo "$DOCKER_VERSION" | cut -d. -f 2)
DOCKER_VERSION_PATCH=$(echo "$DOCKER_VERSION" | cut -d. -f 3)
MIN_DOCKER_VERSION_MAJOR=$(echo "$MIN_DOCKER_VERSION" | cut -d. -f 1)
MIN_DOCKER_VERSION_MINOR=$(echo "$MIN_DOCKER_VERSION" | cut -d. -f 2)
MIN_DOCKER_VERSION_PATCH=$(echo "$MIN_DOCKER_VERSION" | cut -d. -f 3)
if [ \( "$DOCKER_VERSION_MAJOR" -lt "$MIN_DOCKER_VERSION_MAJOR" \) -o \
\( "$DOCKER_VERSION_MAJOR" -eq "$MIN_DOCKER_VERSION_MAJOR" -a \
\( "$DOCKER_VERSION_MINOR" -lt "$MIN_DOCKER_VERSION_MINOR" -o \
\( "$DOCKER_VERSION_MINOR" -eq "$MIN_DOCKER_VERSION_MINOR" -a \
\( "$DOCKER_VERSION_PATCH" -lt "$MIN_DOCKER_VERSION_PATCH" \) \) \) \) ] ; then
echo "ERROR: weave requires Docker version $MIN_DOCKER_VERSION or later; you are running $DOCKER_VERSION" >&2
exit 1
fi
}
enforce_docker_bridge_addr_assign_type() {
if ! ADDR_ASSIGN_TYPE=$(cat /sys/class/net/$DOCKER_BRIDGE/addr_assign_type 2>/dev/null) ; then
echo "Could not determine address assignment type of $DOCKER_BRIDGE" >&2
return
fi
# From include/uapi/linux/netdevice.h
# #define NET_ADDR_PERM 0 /* address is permanent (default) */
# #define NET_ADDR_RANDOM 1 /* address is generated randomly */
# #define NET_ADDR_STOLEN 2 /* address is stolen from other device */
# #define NET_ADDR_SET 3 /* address is set using dev_set_mac_address() */
if [ $ADDR_ASSIGN_TYPE != 3 ] ; then
echo "Setting $DOCKER_BRIDGE MAC (mitigate https://github.com/docker/docker/issues/14908)" >&2
ip link set dev $DOCKER_BRIDGE address $(random_mac) || true
fi
}
check_forwarding_rules() {
if run_iptables -C FORWARD -j REJECT --reject-with icmp-host-prohibited > /dev/null 2>&1; then
cat >&2 <<EOF
WARNING: existing iptables rule
'-A FORWARD -j REJECT --reject-with icmp-host-prohibited'
will block name resolution via weaveDNS - please reconfigure your firewall.
EOF
fi
}
is_cidr() {
echo "$1" | grep -E "^$CIDR_REGEXP$" >/dev/null
}
collect_cidr_args() {
CIDR_ARGS=""
CIDR_ARG_COUNT=0
while [ "$1" = "net:default" ] || is_cidr "$1" || is_cidr "${1#ip:}" || is_cidr "${1#net:}" ; do
CIDR_ARGS="$CIDR_ARGS ${1#ip:}"
CIDR_ARG_COUNT=$((CIDR_ARG_COUNT + 1))
shift 1
done
}
is_ip() {
echo "$1" | grep -E "^$IP_REGEXP$" >/dev/null
}
collect_ip_args() {
IP_ARGS=""
IP_COUNT=0
while is_ip "$1" ; do
IP_ARGS="$IP_ARGS $1"
IP_COUNT=$((IP_COUNT + 1))
shift 1
done
}
dns_arg_count() {
if [ "$1" = "--with-dns" -o "$1" = "--without-dns" ] ; then
echo 1
else
echo 0
fi
}
extra_hosts_args() {
DNS_EXTRA_HOSTS=
DNS_EXTRA_HOSTS_ARGS=
while [ $# -gt 0 ] ; do
case "$1" in
--add-host)
DNS_EXTRA_HOSTS="$2 $DNS_EXTRA_HOSTS"
DNS_EXTRA_HOSTS_ARGS="--add-host=$2 $DNS_EXTRA_HOSTS_ARGS"
shift
;;
--add-host=*)
DNS_EXTRA_HOSTS="${1#*=} $DNS_EXTRA_HOSTS"
DNS_EXTRA_HOSTS_ARGS="--add-host=${1#*=} $DNS_EXTRA_HOSTS_ARGS"
;;
esac
shift
done
}
check_docker_version
if [ "$1" = "--local" ] ; then
shift 1
IS_LOCAL=1
fi
if [ "$1" = "--help" -o "$1" = "help" ] ; then
# "--help|help" are special because we always want to process them
# at the client end.
usage_no_exit
exit 0
elif [ "$1" = "version" -a -z "$IS_LOCAL" ] ; then
# non-local "version" is special because we want to show the
# version of the script executed by the user rather than what is
# embedded in weaveexec.
echo "weave script $SCRIPT_VERSION"
elif [ "$1" = "env" -a "$2" = "--restore" ] ; then
# "env --restore" is special because we always want to process it
# at the client end.
if [ "${ORIG_DOCKER_HOST-unset}" = "unset" ] ; then
echo "Nothing to restore. This is most likely because there was no preceding invocation of 'eval \$(weave env)' in this shell." >&2
exit 1
else
echo "DOCKER_HOST=$ORIG_DOCKER_HOST"
exit 0
fi
elif [ "$1" = "run" -a -z "$IS_LOCAL" ] ; then
# non-local "run" is a special case because we want to use docker
# directly, rather than the docker in $EXEC_IMAGE remotely. That's
# because we are passing arbitrary arguments on to docker run, and
# we can't rely on our baked-in docker to support those arguments.
shift 1
if [ "$1" != "--without-dns" ] ; then
DNS_ARGS=$(exec_remote dns-args "$@" || true)
fi
shift $(dns_arg_count "$@")
if [ "$1" = "--no-rewrite-hosts" ] ; then
shift
else
extra_hosts_args "$@"
DNS_EXTRA_HOSTS_ARGS="--rewrite-hosts $DNS_EXTRA_HOSTS_ARGS"
fi
collect_cidr_args "$@"
shift $CIDR_ARG_COUNT
CONTAINER=$(docker $DOCKER_CLIENT_ARGS run -e WEAVE_CIDR=none $DNS_ARGS -d "$@")
exec_remote attach $CIDR_ARGS --or-die $DNS_EXTRA_HOSTS_ARGS $CONTAINER >/dev/null
echo $CONTAINER
exit 0
fi
if [ -z "$IS_LOCAL" ] ; then
exec_remote "$@"
exit $?
fi
BASE_IMAGE=$DOCKERHUB_USER/weave
IMAGE=$BASE_IMAGE:$IMAGE_VERSION
BASE_PLUGIN_IMAGE=$DOCKERHUB_USER/plugin
PLUGIN_IMAGE=$BASE_PLUGIN_IMAGE:$IMAGE_VERSION
PLUGIN_CONTAINER_NAME=weaveplugin
PROCFS=${PROCFS:-/proc}
DOCKER_BRIDGE=${DOCKER_BRIDGE:-docker0}
CONTAINER_NAME=${WEAVE_CONTAINER_NAME:-weave}
BRIDGE=weave
# This value is overridden when the datapath is used unbridged
DATAPATH=datapath
BRIDGE_IFNAME=link-${BRIDGE}
DATAPATH_IFNAME=${DATAPATH}-link
CONTAINER_IFNAME=ethwe
# ROUTER_HOSTNETNS_IFNAME is only used for fastdp with encryption
ROUTER_HOSTNETNS_IFNAME=veth-weave
PORT=${WEAVE_PORT:-6783}
HTTP_PORT=6784
PROXY_PORT=12375
PROXY_CONTAINER_NAME=weaveproxy
COVERAGE_ARGS=""
if [ -n "$COVERAGE" ] ; then
COVERAGE_ARGS="-test.coverprofile=/home/weave/cover.prof --"
fi
######################################################################
# general helpers; independent of docker and weave
######################################################################
# utility function to check whether a command can be executed by the shell
# see http://stackoverflow.com/questions/592620/how-to-check-if-a-program-exists-from-a-bash-script
command_exists() {
command -v $1 >/dev/null 2>&1
}
fractional_sleep() {
case $1 in
*.*)
if [ -z "$NO_FRACTIONAL_SLEEP" ] ; then
sleep $1 >/dev/null 2>&1 && return 0
NO_FRACTIONAL_SLEEP=1
fi
sleep $((${1%.*} + 1))
;;
*)
sleep $1
;;
esac
}
run_iptables() {
# -w is recent addition to iptables
if [ -z "$CHECKED_IPTABLES_W" ] ; then
if iptables -S -w >/dev/null 2>&1 ; then
IPTABLES_W=-w
fi
CHECKED_IPTABLES_W=1
fi
iptables $IPTABLES_W "$@"
}
# Add a rule to iptables, if it doesn't exist already
add_iptables_rule() {
IPTABLES_TABLE="$1"
shift 1
if ! run_iptables -t $IPTABLES_TABLE -C "$@" >/dev/null 2>&1 ; then
run_iptables -t $IPTABLES_TABLE -A "$@" >/dev/null
fi
}
# Delete a rule from iptables, if it exist
delete_iptables_rule() {
IPTABLES_TABLE="$1"
shift 1
if run_iptables -t $IPTABLES_TABLE -C "$@" >/dev/null 2>&1 ; then
run_iptables -t $IPTABLES_TABLE -D "$@" >/dev/null
fi
}
# Configure the ARP cache parameters for the given interface. This
# makes containers react more quickly to a change in the MAC address
# associated with an IP address.
configure_arp_cache() {
$2 sh -c "echo 5 >/proc/sys/net/ipv4/neigh/$1/base_reachable_time &&
echo 2 >/proc/sys/net/ipv4/neigh/$1/delay_first_probe_time &&
echo 1 >/proc/sys/net/ipv4/neigh/$1/ucast_solicit"
}
# Send out an ARP announcement
# (https://tools.ietf.org/html/rfc5227#page-15) to update ARP cache
# entries across the weave network. We do this in addition to
# configure_arp_cache because a) with those ARP cache settings it
# still takes a few seconds to correct a stale ARP mapping, and b)
# there is a kernel bug that means that the base_reachable_time
# setting is not promptly obeyed
# (<https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4bf6980dd0328530783fd657c776e3719b421d30>>).
arp_update() {
# It's not the end of the world if this doesn't run - we configure
# ARP caches so that stale entries will be noticed quickly.
if command_exists arping ; then
$3 arping -U -q -I $1 -c 1 ${2%/*}
fi
}
# Generate a random MAC value
random_mac() {
# In the first byte of the MAC, the 'multicast' bit should be
# clear and 'locally administered' bit should be set. All other
# bits should be random.
od -txC -An -N6 /dev/urandom | ( read a b c d e f && printf "%02x:$b:$c:$d:$e:$f" $((0x$a & ~1 | 2)) )
}
######################################################################
# weave and docker specific helpers
######################################################################
# Detect the current bridge/datapath state. When invoked, the values of
# $BRIDGE and $DATAPATH are expected to be distinct. $BRIDGE_TYPE and
# $DATAPATH are set correctly on success; failure indicates that the
# bridge/datapath devices have yet to be configured. If netdevs do exist
# but are in an inconsistent state the script aborts with an error.
detect_bridge_type() {
BRIDGE_TYPE=
if [ -d /sys/class/net/$DATAPATH ] ; then
# Unfortunately there's no simple way to positively check whether
# $DATAPATH is an ODP netdev so we have to make sure it isn't
# a bridge instead (and that $BRIDGE is).
if [ ! -d /sys/class/net/$DATAPATH/bridge -a -d /sys/class/net/$BRIDGE/bridge ] ; then
BRIDGE_TYPE=bridged_fastdp
else
echo "Inconsistent bridge state detected. Please do 'weave reset' and try again" >&2
exit 1
fi
elif [ -d /sys/class/net/$BRIDGE ] ; then
if [ -d /sys/class/net/$BRIDGE/bridge ] ; then
BRIDGE_TYPE=bridge
else
BRIDGE_TYPE=fastdp
# The datapath is the bridge when there is no intermediary
DATAPATH="$BRIDGE"
fi
else
# No bridge/datapath devices configured
return 1
fi
}
create_bridge() {
if ! detect_bridge_type ; then
BRIDGE_TYPE=bridge
if [ -z "$WEAVE_NO_FASTDP" ] ; then
BRIDGE_TYPE=bridged_fastdp
if [ -n "$WEAVE_NO_BRIDGED_FASTDP" ] ; then
BRIDGE_TYPE=fastdp
# The datapath is the bridge when there is no intermediary
DATAPATH="$BRIDGE"
fi
if docker run --rm --privileged --net=host $IMAGE $COVERAGE_ARGS --create-datapath --datapath=$DATAPATH ; then
: # ODP datapath created successfully
elif [ $? = 17 ] ; then
# Exit status of 17 means the kernel doesn't have ODP
BRIDGE_TYPE=bridge
else
return 1
fi
fi
init_$BRIDGE_TYPE
# Drop traffic from Docker bridge to Weave; it can break
# subnet isolation
if [ "$DOCKER_BRIDGE" != "$BRIDGE" ] ; then
# Note using -I to insert ahead of Docker's bridge rules
run_iptables -t filter -I FORWARD -i $DOCKER_BRIDGE -o $BRIDGE -j DROP
fi
[ -n "$DOCKER_BRIDGE_IP" ] || docker_bridge_ip
# forbid traffic to the Weave port from other containers
add_iptables_rule filter INPUT -i $DOCKER_BRIDGE -p tcp --dst $DOCKER_BRIDGE_IP --dport $PORT -j DROP
add_iptables_rule filter INPUT -i $DOCKER_BRIDGE -p udp --dst $DOCKER_BRIDGE_IP --dport $PORT -j DROP
add_iptables_rule filter INPUT -i $DOCKER_BRIDGE -p udp --dst $DOCKER_BRIDGE_IP --dport $(($PORT + 1)) -j DROP
# let DNS traffic to weaveDNS, since otherwise it might get blocked by the likes of UFW
add_iptables_rule filter INPUT -i $DOCKER_BRIDGE -p udp --dport 53 -j ACCEPT
add_iptables_rule filter INPUT -i $DOCKER_BRIDGE -p tcp --dport 53 -j ACCEPT
# Work around the situation where there are no rules allowing traffic
# across our bridge. E.g. ufw
add_iptables_rule filter FORWARD -i $BRIDGE -o $BRIDGE -j ACCEPT
# create a chain for masquerading
run_iptables -t nat -N WEAVE >/dev/null 2>&1 || true
add_iptables_rule nat POSTROUTING -j WEAVE
else
if [ -n "$LAUNCHING_ROUTER" ] ; then
if [ "$BRIDGE_TYPE" = bridge -a -z "$WEAVE_NO_FASTDP" ] ; then
cat <<EOF >&1
WEAVE_NO_FASTDP is not set, but there is already a bridge present of
the wrong type for fast datapath. Please do 'weave reset' to remove
the bridge first.
EOF
return 1
fi
if [ "$BRIDGE_TYPE" != bridge -a -n "$WEAVE_NO_FASTDP" ] ; then
cat <<EOF >&1
WEAVE_NO_FASTDP is set, but there is already a weave fast datapath
bridge present. Please do 'weave reset' to remove the bridge first.
EOF
return 1
fi
fi
# WEAVE_MTU may have been specified when the bridge was
# created (perhaps implicitly with WEAVE_NO_FASTDP). So take
# the MTU from the bridge unless it is explicitly specified
# for this invocation.
MTU=${WEAVE_MTU:-$(cat /sys/class/net/$BRIDGE/mtu)}
fi
if [ "$1" != "--without-ethtool" ] ; then
ethtool_tx_off_$BRIDGE_TYPE $BRIDGE
fi
ip link set dev $BRIDGE up
# Configure the ARP cache parameters on the bridge interface for
# the sake of 'weave expose'
configure_arp_cache $BRIDGE
}
init_fastdp() {
# GCE has the lowest underlay network MTU we're likely to encounter on
# a local network, at 1460 bytes. To get the overlay MTU from that we
# subtract 20 bytes for the outer IPv4 header, 8 bytes for the outer
# UDP header, 8 bytes for the vxlan header, and 14 bytes for the inner
# ethernet header.
MTU=${WEAVE_MTU:-1410}
# create_bridge already created the datapath netdev
ip link set dev $DATAPATH mtu $MTU
}
init_bridge() {
# Observe any MTU that is already set
if [ -z "$MTU" ] ; then
MTU=${WEAVE_MTU:-65535}
fi
ip link add name $BRIDGE type bridge
# Set a random MAC address on the bridge. Current Linux
# kernels already do this when creating a bridge, but there
# are rumours it was not always so.
ip link set dev $BRIDGE address $(random_mac)
# Attempting to set the bridge MTU to a high value directly
# fails. Bridges take the lowest MTU of their interfaces. So
# instead we create a temporary interface with the desired
# MTU, attach that to the bridge, and then remove it again.
ip link add name v${CONTAINER_IFNAME}du mtu $MTU type dummy
ip link set dev v${CONTAINER_IFNAME}du master $BRIDGE
ip link del dev v${CONTAINER_IFNAME}du
}
init_bridged_fastdp() {
# Initialise the datapath as normal. NB sets MTU for use below
init_fastdp
# Create linking veth pair. We do this before initialising the bridge
# so that `ip link show` displays the datapath, linking veths and
# the bridge in natural order
ip link del $DATAPATH_IFNAME >/dev/null 2>&1 || true
ip link del $BRIDGE_IFNAME >/dev/null 2>&1 || true
ip link add name $BRIDGE_IFNAME mtu $MTU type veth peer name $DATAPATH_IFNAME mtu $MTU || return 1
# Initialise the bridge using fast datapath MTU
init_bridge
# Link intermediary bridge and datapath
if ! ip link set $DATAPATH_IFNAME up ||
! ip link set $BRIDGE_IFNAME up ||
! add_iface_fastdp $DATAPATH_IFNAME || ! ip link set $BRIDGE_IFNAME master $BRIDGE ; then
# Failed to link bridge and datapath - clean up
ip link del $BRIDGE >/dev/null 2>&1 || true
ip link del $DATAPATH_IFNAME >/dev/null 2>&1 || true
ip link del $BRIDGE_IFNAME >/dev/null 2>&1 || true
docker run --rm --privileged --net=host $IMAGE $COVERAGE_ARGS --delete-datapath --datapath=$DATAPATH >/dev/null 2>&1 || true
return 1
fi
# Finally, bring the datapath up
ip link set dev $DATAPATH up
}
ethtool_tx_off_fastdp() {
true
}
ethtool_tx_off_bridge() {
ethtool -K $1 tx off >/dev/null
}
ethtool_tx_off_bridged_fastdp() {
true
}
destroy_bridge() {
# It's important that detect_bridge_type has not been called so
# we have distinct values for $BRIDGE and $DATAPATH. Make best efforts
# to remove netdevs of any type with those names so `weave reset` can
# recover from inconsistent states.
for NETDEV in $BRIDGE $DATAPATH ; do
if [ -d /sys/class/net/$NETDEV ] ; then
if [ -d /sys/class/net/$NETDEV/bridge ] ; then
ip link del $NETDEV
else
docker run --rm --privileged --net=host $IMAGE $COVERAGE_ARGS --delete-datapath --datapath=$NETDEV
fi
fi
done
# Remove any lingering bridged fastdp veth
ip link del $DATAPATH_IFNAME >/dev/null 2>&1 || true
ip link del $BRIDGE_IFNAME >/dev/null 2>&1 || true
if [ "$DOCKER_BRIDGE" != "$BRIDGE" ] ; then
run_iptables -t filter -D FORWARD -i $DOCKER_BRIDGE -o $BRIDGE -j DROP 2>/dev/null || true
fi
[ -n "$DOCKER_BRIDGE_IP" ] || docker_bridge_ip
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p udp --dport 53 -j ACCEPT >/dev/null 2>&1 || true
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p tcp --dport 53 -j ACCEPT >/dev/null 2>&1 || true
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p tcp --dst $DOCKER_BRIDGE_IP --dport $PORT -j DROP >/dev/null 2>&1 || true
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p udp --dst $DOCKER_BRIDGE_IP --dport $PORT -j DROP >/dev/null 2>&1 || true
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p udp --dst $DOCKER_BRIDGE_IP --dport $(($PORT + 1)) -j DROP >/dev/null 2>&1 || true
run_iptables -t filter -D FORWARD -i $BRIDGE -o $BRIDGE -j ACCEPT 2>/dev/null || true
run_iptables -t nat -F WEAVE >/dev/null 2>&1 || true
run_iptables -t nat -D POSTROUTING -j WEAVE >/dev/null 2>&1 || true
run_iptables -t nat -X WEAVE >/dev/null 2>&1 || true
}
docker_bridge_ip() {
DOCKER_BRIDGE_IP=$(ip -4 addr show dev $DOCKER_BRIDGE | grep -m1 -o 'inet [.0-9]*')
DOCKER_BRIDGE_IP=${DOCKER_BRIDGE_IP#inet }
}
# the following borrows from https://github.com/jpetazzo/pipework
# Set $CONTAINER_PID to the PID of container $1, $LOCAL_IFNAME and
# $GUEST_IFNAME to suitable names for two ends of a veth pair, specific
# to the container, and execute args $2 $3 ... as a command. If an error
# is caused by container dying, swallow output from error.
with_container_netns() {
CONTAINER="$1"
CONTAINER_PID=$(docker inspect --format='{{.State.Pid}}' $CONTAINER)
if [ "$CONTAINER_PID" = 0 ] ; then
echo "Container $CONTAINER not running." >&2
exit 1
fi
if [ "$CONTAINER_PID" = "<no value>" ] ; then
echo "Container $CONTAINER unknown to Docker." >&2
exit 1
fi
LOCAL_IFNAME="v${CONTAINER_IFNAME}pl${CONTAINER_PID}"
GUEST_IFNAME="v${CONTAINER_IFNAME}pg${CONTAINER_PID}"
IP_TMPOUT=/tmp/weave_ip_out_$$
IP_TMPERR=/tmp/weave_ip_err_$$
rm -f $IP_TMPOUT $IP_TMPERR
# Run the wrapped command
STATUS=0
shift 1
if ! "$@" >$IP_TMPOUT 2>$IP_TMPERR ; then
STATUS=1
if [ ! -d $PROCFS/$CONTAINER_PID ] ; then
echo "Container $CONTAINER died" >&2
else
echo "Failure during network configuration for container $CONTAINER:" >&2
cat $IP_TMPERR >&2
fi
else
cat $IP_TMPOUT
cat $IP_TMPERR >&2
fi
rm -f $IP_TMPOUT $IP_TMPERR
return $STATUS
}
with_container_netns_or_die() {
if ! with_container_netns "$@" >/dev/null ; then
docker kill $1 >/dev/null 2>&1 || true
exit 1
fi
}
# Execute arguments as a command within the network namespace of $CONTAINER_PID
netnsenter() {
nsenter --net=$PROCFS/$CONTAINER_PID/ns/net "$@"
}
# connect_container_to_bridge <container inteface name>
connect_container_to_bridge() {
ip link add name $LOCAL_IFNAME mtu $MTU type veth peer name $GUEST_IFNAME mtu $MTU || return 1
if ! ethtool_tx_off_$BRIDGE_TYPE $GUEST_IFNAME ||
! ip link set $GUEST_IFNAME netns $PROCFS/$CONTAINER_PID/ns/net ; then
# failed before we assigned the veth to the container's
# namespace
ip link del $LOCAL_IFNAME type veth || true
return 1
fi
# Versions of the 'ip' command differ in whether they create a
# veth pair in the 'up' or 'down' state. Furthermore, moving one
# end into a netns normally sets them to 'down'. But, moving an
# end into the default netns is a null operation, so they stay up,
# which leads to errors later on. So to get a consistent result,
# we have to be explicit in setting them 'up' or 'down' as
# necessary.
if ! netnsenter ip link set $GUEST_IFNAME down ||
! netnsenter ip link set $GUEST_IFNAME name $1 up ||
! ip link set $LOCAL_IFNAME up ||
! add_iface_$BRIDGE_TYPE $LOCAL_IFNAME ||
! configure_arp_cache $1 "netnsenter" ; then
return 1
fi
}
add_iface_fastdp() {
docker run --rm --privileged --net=host $IMAGE $COVERAGE_ARGS --datapath=$DATAPATH --add-datapath-iface=$1
}
add_iface_bridge() {
ip link set $1 master $BRIDGE
}
add_iface_bridged_fastdp() {
add_iface_bridge "$@"
}
ask_version() {
if ! DOCKERIMAGE=$(docker inspect --format='{{.Image}}' $1 2>/dev/null) ; then
if ! DOCKERIMAGE=$(docker inspect --format='{{.Id}}' $2 2>/dev/null) ; then
echo "Unable to find $2 image." >&2
fi
fi
[ -n "$DOCKERIMAGE" ] && docker run --rm --net=none -e WEAVE_CIDR=none $3 $DOCKERIMAGE $COVERAGE_ARGS --version
}
router_opts_fastdp() {
if [ -z "$WEAVE_PASSWORD" ] ; then
echo "--datapath $DATAPATH"
else
# When using encryption, we still do bridging on the ODP
# datapath, because you can 'weave launch' without encryption
# and then later restart the router with encryption, or vice
# versa. Encryption disables the use of the fastdp Overlay,
# but the router could still use the fastdp Bridge to receive
# packets. However, pcap has better performance when sniffing
# every packet. So we pass --iface to use the pcap Bridge.
#
# Why don't we simply pass "--iface $BRIDGE". We could,
# except for the fact that NetworkManager likes to down the
# odp $BRIDGE netdev (at least under ubuntu), and you can only
# use pcap on an interface that is up. We avoid that by use
# pcap via a veth pair (NetworkManager leaves them alone).
# Having a netdev in the host netns called "ethwe" might
# surprise people, so it is called $ROUTER_HOSTNETNS_IFNAME
# instead.
echo "--datapath $DATAPATH --iface $ROUTER_HOSTNETNS_IFNAME"
fi
}
router_opts_bridge() {
echo "--iface $CONTAINER_IFNAME"
}
router_opts_bridged_fastdp() {
router_opts_fastdp "$@"
}
######################################################################
# functions invoked through with_container_netns
######################################################################
setup_router_iface_fastdp() {
if [ -n "$WEAVE_PASSWORD" ] ; then
# See router_opts_fastdp
# No-op if already attached
if ip link show $LOCAL_IFNAME >/dev/null 2>&1 ; then
return 0
fi
connect_container_to_bridge $ROUTER_HOSTNETNS_IFNAME &&
ip link set $ROUTER_HOSTNETNS_IFNAME up
fi
}
setup_router_iface_bridge() {
if ! netnsenter ip link show eth0 >/dev/null ; then
echo "Perhaps you are running the docker daemon with container networking disabled (-b=none)." >&2
return 1
fi
# No-op if already attached
if netnsenter ip link show $CONTAINER_IFNAME >/dev/null 2>&1 ; then
return 0
fi
connect_container_to_bridge $CONTAINER_IFNAME &&
netnsenter ethtool -K eth0 tx off >/dev/null &&
netnsenter ip link set $CONTAINER_IFNAME up
}
setup_router_iface_bridged_fastdp() {
setup_router_iface_fastdp "$@"
}
attach() {
if [ -h "$PROCFS/$CONTAINER_PID/ns/net" -a -h "/proc/self/ns/net" -a "$(readlink $PROCFS/$CONTAINER_PID/ns/net)" = "$(readlink /proc/self/ns/net)" ] ; then
echo "Container is running in the host network namespace, and therefore cannot be" >&2
echo "connected to weave. Perhaps the container was started with --net=host." >&2
return 1
fi
if ! netnsenter ip link show $CONTAINER_IFNAME >/dev/null 2>&1 ; then
connect_container_to_bridge $CONTAINER_IFNAME || return 1
fi
NEW_ADDRS=
for ADDR in "$@" ; do
if netnsenter ip addr show dev $CONTAINER_IFNAME | grep -F $ADDR >/dev/null ; then
# address was there already
continue
fi
netnsenter ip addr add $ADDR dev $CONTAINER_IFNAME || return 1
NEW_ADDRS="$NEW_ADDRS $ADDR"
done
netnsenter ip link set $CONTAINER_IFNAME up || return 1
for ADDR in $NEW_ADDRS ; do
arp_update $CONTAINER_IFNAME $ADDR "netnsenter"
done
# Route multicast packets across the weave network.
# This must come last in 'attach'. If you change this, change weavewait to match.
#
# The MTU lock prevents PMTU discovery for multicast
# destinations. Without that, the kernel sets the DF flag on
# multicast packets. Since RFC1122 prohibits sending of ICMP
# errors for packets with multicast destinations, that causes
# packets larger than the PMTU to be dropped silently.
if ! netnsenter ip route show | grep '^224\.0\.0\.0/4' >/dev/null ; then
netnsenter ip route add 224.0.0.0/4 dev $CONTAINER_IFNAME mtu lock $MTU
fi
}
detach() {
netnsenter ip link show $CONTAINER_IFNAME >/dev/null 2>&1 || return 0
for ADDR in "$@" ; do
if ! netnsenter ip addr show dev $CONTAINER_IFNAME | grep -F $ADDR >/dev/null ; then
# address is not there, leave the device alone
continue
fi
netnsenter ip addr del $ADDR dev $CONTAINER_IFNAME || return 1
done
if [ -n "$(netnsenter ip -f inet addr show dev $CONTAINER_IFNAME)" ] ; then
# other addresses are left, leave the device alone
return 0
fi
# Deleting the interface will delete the multicast route we set up
netnsenter ip link del $CONTAINER_IFNAME type veth
}
container_weave_addrs() {
netnsenter ip addr show dev $CONTAINER_IFNAME
}
######################################################################
# functions for interacting with containers
######################################################################
# Check that a container named $1 with image $2 is not running
check_not_running() {
case $(docker inspect --format='{{.State.Running}} {{.Config.Image}}' $1 2>/dev/null) in
"true $2")
echo "$1 is already running." >&2
exit 1
;;
"true $2:"*)
echo "$1 is already running." >&2
exit 1
;;
"false $2")
docker rm $1 >/dev/null
;;
"false $2:"*)
docker rm $1 >/dev/null
;;
true*)
echo "Found another running container named '$1'. Aborting." >&2
exit 1
;;
false*)
echo "Found another container named '$1'. Aborting." >&2
exit 1
;;
esac
}
stop() {
if ! docker stop $1 >/dev/null 2>&1 ; then
echo "$2 is not running." >&2
fi
docker rm -f $1 >/dev/null 2>&1 || true
}
# Given a container name or short ID in $1, ensure the specified
# container is running and then print its full ID to stdout. If
# it's not running or doesn't exist, print an error to stderr and
# return with an indicative non-zero exit code.
container_id() {
if ! status=$(docker inspect --format='{{.State.Running}} {{.Id}}' $1 2>/dev/null) ; then
echo "Error: No such container: $1" >&2
return 1
fi
case "$status" in
true*)
echo "${status#true }"
;;
*)
echo "$1 container is not running." >&2
return 2
;;
esac
}
container_ip() {
if ! status=$(docker inspect --format='{{.State.Running}} {{.NetworkSettings.IPAddress}}' $1 2>/dev/null) ; then
echo "$2" >&2
return 1
fi
case "$status" in
"true ")
#echo "$1 container has no IP address; is Docker networking enabled?" >&2
CONTAINER_IP=127.0.0.1
;;
true*)
CONTAINER_IP="${status#true }"
;;
*)
echo "$3" >&2
return 1
;;
esac
}
http_call() {
addr="$1"
http_verb="$2"
url="$3"
shift 3
curl --connect-timeout 3 -s -S -X $http_verb "$@" http://$addr$url
}
http_call_unix() {
container="$1"
socket="$2"
http_verb="$3"
url="$4"
shift 4
# NB: requires curl >= 7.40
output=$(docker exec $container curl -s -S -X $http_verb --unix-socket $socket "$@" http:$url)
# in some docker versions, `docker exec` does not fail when the executed command fails
[ -n "$output" ] || return 1
echo $output
}
call_weave() {
container_ip $CONTAINER_NAME \
"$CONTAINER_NAME container is not present. Have you launched it?" \
"$CONTAINER_NAME container is not running." \
|| return 1
if ! http_call $CONTAINER_IP:$HTTP_PORT "$@" ; then
echo "Call to $CONTAINER_NAME failed." >&2
return 1
fi
}
death_msg() {
echo "The $1 container has died. Consult the container logs for further details."
}
# Wait until container $1 is alive enough to respond to "GET /status"
# http request
wait_for_status() {
container="$1"
shift
while true ; do
"$@" GET /status >/dev/null 2>&1 && return 0
if ! container_id $container >/dev/null 2>&1 ; then
echo $(death_msg $container) >&2
return 1
fi
fractional_sleep 0.1
done