[ovs-dev] [PATCH ovn v6] ofctrl.c: Add a predictable resolution for conflicting flow actions.
Mark Gray
mark.d.gray at redhat.com
Wed Oct 14 20:07:50 UTC 2020
On 13/10/2020 19:06, Han Zhou wrote:
> On Tue, Oct 13, 2020 at 1:52 AM Dumitru Ceara <dceara at redhat.com> wrote:
>>
>> Until now, in case the ACL configuration generates openflows that have
>> the same match but different actions, ovn-controller was using the
>> following approach:
>> 1. If the flow being added contains conjunctive actions, merge its
>> actions with the already existing flow.
>> 2. Otherwise, if the flow is being added incrementally
>> (update_installed_flows_by_track), don't install the new flow but
>> instead keep the old one.
>> 3. Otherwise, (update_installed_flows_by_compare), don't install the
>> new flow but instead keep the old one.
>>
>> Even though one can argue that having an ACL with a match that includes
>> the match of another ACL is a misconfiguration, it can happen that the
>> users provision OVN like this. Depending on the order of reading and
>> installing the logical flows, the above operations can yield
>> unpredictable results, e.g., allow specific traffic but then after
>> ovn-controller is restarted (or a recompute happens) that specific
>> traffic starts being dropped.
>>
>> A simple example of ACL configuration is:
>> ovn-nbctl acl-add ls to-lport 3 '(ip4.src==10.0.0.1 ||
>> ip4.src==10.0.0.2) && (ip4.dst == 10.0.0.3 || ip4.dst == 10.0.0.4)' allow
>> ovn-nbctl acl-add ls to-lport 3 'ip4.src==10.0.0.1' allow
>> ovn-nbctl acl-add ls to-lport 2 'arp' allow
>> ovn-nbctl acl-add ls to-lport 1 'ip4' drop
>>
>> This is a pattern used by most CMSs:
>> - define a default deny policy.
>> - punch holes in the default deny policy based on user specific
>> configurations.
>>
>> Without this commit the behavior for traffic from 10.0.0.1 to 10.0.0.5
>> is unpredictable. Depending on the order of operations traffic might be
>> dropped or allowed.
>>
>> It's also quite hard to force the CMS to ensure that such match overlaps
>> never occur.
>>
>> To address this issue we now ensure that when selecting the active flow
>> from all desired flows refering the same installed flow we give
>> precedence to "allow" over "drop" over "conjunction" flows.
>>
>> Essentially, less restrictive flows are always preferred over more
>> restrictive flows whenever a match conflict happens.
>>
>> CC: Daniel Alvarez <dalvarez at redhat.com>
>> Reported-at: https://bugzilla.redhat.com/1871931
>> Signed-off-by: Dumitru Ceara <dceara at redhat.com>
>> ---
>> v6:
>> - First 3 patches of the v5 series were already applied.
>> - Send patch 4 as v6 addressing Han's comments:
>> - Instead of maintaining a sorted list, select active flow by walking
>> the list of desired flows.
>> - Add missing ovn_flow_log() call.
>> v5:
>> - Turn the patch into a series.
>> - Address Han's comments.
>> - Ensure predictable flow ordering in all cases (during incremental
>> procesing
>> or full recomputation).
>> v4:
>> - Address Han's comments:
>> - make sure only flows with action conjunction are combined.
>> v3:
>> - Add Mark's ack.
>> - Add last missing pcap check in the test.
>> v2:
>> - Address Han's comments:
>> - Do not delete desired flow that cannot be merged, it might be
>> installed later.
>> - Fix typos in the commit log.
>> - Update the test to check the OVS flows.
>> ---
>> controller/ofctrl.c | 96 +++++++++++++++++++++--
>> tests/ovn.at | 214
> ++++++++++++++++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 305 insertions(+), 5 deletions(-)
>>
>> diff --git a/controller/ofctrl.c b/controller/ofctrl.c
>> index ba0c61c..0edb2b9 100644
>> --- a/controller/ofctrl.c
>> +++ b/controller/ofctrl.c
>> @@ -229,6 +229,8 @@ static struct installed_flow *installed_flow_lookup(
>> static void installed_flow_destroy(struct installed_flow *);
>> static struct installed_flow *installed_flow_dup(struct desired_flow *);
>> static struct desired_flow *installed_flow_get_active(struct
> installed_flow *);
>> +static struct desired_flow *installed_flow_select_active(
>> + struct installed_flow *);
>>
>> static uint32_t ovn_flow_match_hash(const struct ovn_flow *);
>> static char *ovn_flow_to_string(const struct ovn_flow *);
>> @@ -796,6 +798,12 @@ ofctrl_recv(const struct ofp_header *oh, enum
> ofptype type)
>> }
>>
>> static bool
>> +flow_action_has_drop(const struct ovn_flow *f)
>> +{
>> + return f->ofpacts_len == 0;
>> +}
>> +
>> +static bool
>> flow_action_has_conj(const struct ovn_flow *f)
>> {
>> const struct ofpact *a = NULL;
>> @@ -822,7 +830,7 @@ link_installed_to_desired(struct installed_flow *i,
> struct desired_flow *d)
>> {
>> d->installed_flow = i;
>> ovs_list_push_back(&i->desired_refs, &d->installed_ref_list_node);
>> - return installed_flow_get_active(i) == d;
>> + return installed_flow_select_active(i) == d;
>> }
>>
> Hi Dumitru, I am really sorry that I didn't make it clear enough in my last
> comments. I meant that I prefer maintaining the order in the desired_refs
Is the ordering of this documented anywhere? At least in struct
installed_flow in the comment above desired_refs?
> list in the function link_installed_to_desired() when the item is inserted,
> which makes the "first item is active" more useful. I didn't want to you
> drop the ordering (but just wanted to avoid the array). Otherwise I would
> not merge the patch 2 & 3 but directly use the temporary patch you created.
> To be more clear, it could be something like below:
>
> /* Returns true if flow a is prefered over flow b. */
> static bool
> flow_compare(struct ovn_flow *a, struct ovn_flow *b)
> {
> ...
> if (b_has_allow) {
> return false;
> }
> if (a_has_allow) {
> return true;
> }
> if (b_has_drop) {
> return false;
> }
> if (a_has_drop) {
> return true;
> }
> /* both has conjunction only, assert failure */
> OVS_NOT_REACHED();
> }
I think this will make the code more readable as well. Perhaps the name
flow_compare() is not descriptive enough. Maybe something like
flow_is_preferred() or flow_preferred().
>
> static bool
> link_installed_to_desired(struct installed_flow *i, struct desired_flow *d)
> {
> d->installed = i;
> bool inserted = false;
> LIST_FOR_EACH(f, &i->desired_refs) {
> if (flow_compare(&d->flow, &f->flow)) {
How big are these lists likely to get? i.e. will this scale?
> /* Insert d before f */
> ovs_list_insert(&f->installed_ref_list_node,
> &d->installed_ref_list_node);
> inserted = true;
> break;
> }
> }
> if (!inserted) {
> ovs_list_push_back(&i->desired_refs, &d->installed_ref_list_node);
> }
> }
>
>> /* Replaces 'old_desired' with 'new_desired' in the list of desired flows
>> @@ -852,6 +860,7 @@ unlink_installed_to_desired(struct installed_flow *i,
> struct desired_flow *d)
>>
>> ovs_assert(d && d->installed_flow == i);
>> ovs_list_remove(&d->installed_ref_list_node);
>> + installed_flow_select_active(i);
>
> This is not needed if the order is always maintained in
> link_installed_to_desired like above example.
>
>> d->installed_flow = NULL;
>> return old_active == d;
>> }
>> @@ -1274,6 +1283,70 @@ installed_flow_get_active(struct installed_flow *f)
>> return NULL;
>> }
>>
>> +/* Walks the list of desired flows that refer 'f' and selects the least
>> + * restrictive one to be used as active flow, moving it to the front of
>> + * the list.
>> + *
>> + * Returns the new active flow.
>> + */
>> +static struct desired_flow *
>> +installed_flow_select_active(struct installed_flow *f)
>> +{
>> + struct desired_flow *old_active = installed_flow_get_active(f);
>> + struct desired_flow *active = NULL;
>> +
>> + /* If there is at most one desired_flow, no selection needed, return
>> + * early.
>> + */
>> + if (!old_active || ovs_list_is_short(&f->desired_refs)) {
>> + return old_active;
>> + }
>> +
>> + struct desired_flow *d_allow = NULL;
>> + struct desired_flow *d_drop = NULL;
>> + struct desired_flow *d_conj = NULL;
>> + struct desired_flow *d;
>> +
>> + LIST_FOR_EACH (d, installed_ref_list_node, &f->desired_refs) {
>> + if (flow_action_has_drop(&d->flow)) {
>> + if (!d_drop) {
>> + d_drop = d;
>> + }
>> + } else if (flow_action_has_conj(&d->flow)) {
>> + /* Conjunction flows are always merged together into a single
>> + * flow. There should never be more than one referring the
> same
>> + * installed flow.
>> + */
>> + ovs_assert(!d_conj);
>> + d_conj = d;
>> + } else {
>> + if (!d_allow) {
>> + d_allow = d;
>> + }
>> + }
>> + }
>> +
>> + /* Give precedence to "allow" over "drop" over "conjunction" action.
> */
>> + if (d_allow) {
>> + active = d_allow;
>> + } else if (d_drop) {
>> + active = d_drop;
>> + } else {
>> + active = d_conj;
>> + }
>
> If there are multiple flows in the same category (e.g. allow) in the list,
> this function will select a different flow everytime, and move it to the
> front, resulting in an unnecessary flow-mod. (But never mind, because this
> function is not needed with the above suggested change)
>
>> +
>> + /* There must be an active flow otherwise we should have returned
> early. */
>> + ovs_assert(active);
>> +
>> + /* Move the newly selected active flow to the front of the list. */
>> + if (active != old_active) {
>> + ovs_list_remove(&active->installed_ref_list_node);
>> + ovs_list_push_front(&f->desired_refs,
>> + &active->installed_ref_list_node);
>> + }
>> + return active;
>> +}
>> +
>> static struct desired_flow *
>> desired_flow_lookup__(struct ovn_desired_flow_table *flow_table,
>> const struct ovn_flow *target,
>> @@ -1789,8 +1862,14 @@ update_installed_flows_by_compare(struct
> ovn_desired_flow_table *flow_table,
>> link_installed_to_desired(i, d);
>> } else if (!d->installed_flow) {
>> /* This is a desired_flow that conflicts with one installed
>> - * previously but not linked yet. */
>> - link_installed_to_desired(i, d);
>> + * previously but not linked yet. However, if this flow
> becomes
>> + * active, e.g., it is less restrictive than the previous
> active
>> + * flow then modify the installed flow.
>> + */
>> + if (link_installed_to_desired(i, d)) {
>> + installed_flow_mod(&i->flow, &d->flow, msgs);
>> + ovn_flow_log(&i->flow, "updating installed (conflict)");
>> + }
>> }
>> }
>> }
>> @@ -1919,8 +1998,15 @@ update_installed_flows_by_track(struct
> ovn_desired_flow_table *flow_table,
>> installed_flow_mod(&i->flow, &f->flow, msgs);
>> } else {
>> /* Adding a new flow that conflicts with an existing
> installed
>> - * flow, so just add it to the link. */
>> - link_installed_to_desired(i, f);
>> + * flow, so add it to the link. If this flow becomes
> active,
>> + * e.g., it is less restrictive than the previous active
> flow
>> + * then modify the installed flow.
>> + */
>> + if (link_installed_to_desired(i, f)) {
>> + installed_flow_mod(&i->flow, &f->flow, msgs);
>> + ovn_flow_log(&i->flow,
>> + "updating installed (tracked
> conflict)");
>> + }
>> }
>> /* The track_list_node emptyness is used to check if the
> node is
>> * already added to track list, so initialize it again here.
> */
>> diff --git a/tests/ovn.at b/tests/ovn.at
>> index 488fd11..9420b1e 100644
>> --- a/tests/ovn.at
>> +++ b/tests/ovn.at
>> @@ -13727,6 +13727,220 @@ grep conjunction.*conjunction.*conjunction | wc
> -l`])
>> OVN_CLEANUP([hv1])
>> AT_CLEANUP
>>
>> +AT_SETUP([ovn -- Superseeding ACLs with conjunction])
>> +ovn_start
>> +
>> +ovn-nbctl ls-add ls1
>> +
>> +ovn-nbctl lsp-add ls1 ls1-lp1 \
>> +-- lsp-set-addresses ls1-lp1 "f0:00:00:00:00:01"
>> +
>> +ovn-nbctl lsp-add ls1 ls1-lp2 \
>> +-- lsp-set-addresses ls1-lp2 "f0:00:00:00:00:02"
>> +
>> +net_add n1
>> +sim_add hv1
>> +
>> +as hv1
>> +ovs-vsctl add-br br-phys
>> +ovn_attach n1 br-phys 192.168.0.1
>> +ovs-vsctl -- add-port br-int hv1-vif1 -- \
>> + set interface hv1-vif1 external-ids:iface-id=ls1-lp1 \
>> + options:tx_pcap=hv1/vif1-tx.pcap \
>> + options:rxq_pcap=hv1/vif1-rx.pcap \
>> + ofport-request=1
>> +
>> +ovs-vsctl -- add-port br-int hv1-vif2 -- \
>> + set interface hv1-vif2 external-ids:iface-id=ls1-lp2 \
>> + options:tx_pcap=hv1/vif2-tx.pcap \
>> + options:rxq_pcap=hv1/vif2-rx.pcap \
>> + ofport-request=2
>> +
>> +# test_ip INPORT SRC_MAC DST_MAC SRC_IP DST_IP OUTPORT...
>> +#
>> +# This shell function causes an ip packet to be received on INPORT.
>> +# The packet's content has Ethernet destination DST and source SRC
>> +# (each exactly 12 hex digits) and Ethernet type ETHTYPE (4 hex digits).
>> +# The OUTPORTs (zero or more) list the VIFs on which the packet should
>> +# be received. INPORT and the OUTPORTs are specified as logical switch
>> +# port numbers, e.g. 11 for vif11.
>> +test_ip() {
>> + # This packet has bad checksums but logical L3 routing doesn't check.
>> + local inport=$1 src_mac=$2 dst_mac=$3 src_ip=$4 dst_ip=$5
>> + local
> packet=${dst_mac}${src_mac}08004500001c0000000040110000${src_ip}\
>> +${dst_ip}0035111100080000
>> + shift; shift; shift; shift; shift
>> + as hv1 ovs-appctl netdev-dummy/receive hv1-vif1 $packet
>> + for outport; do
>> + echo $packet >> $outport.expected
>> + done
>> +}
>> +
>> +ip_to_hex() {
>> + printf "%02x%02x%02x%02x" "$@"
>> +}
>> +
>> +reset_pcap_file() {
>> + local iface=$1
>> + local pcap_file=$2
>> + ovs-vsctl -- set Interface $iface options:tx_pcap=dummy-tx.pcap \
>> +options:rxq_pcap=dummy-rx.pcap
>> + rm -f ${pcap_file}*.pcap
>> + ovs-vsctl -- set Interface $iface
> options:tx_pcap=${pcap_file}-tx.pcap \
>> +options:rxq_pcap=${pcap_file}-rx.pcap
>> +}
>> +
>> +# Add a default deny ACL and an allow ACL for specific IP traffic.
>> +ovn-nbctl acl-add ls1 to-lport 2 'arp' allow
>> +ovn-nbctl acl-add ls1 to-lport 1 'ip4' drop
>> +ovn-nbctl acl-add ls1 to-lport 3 '(ip4.src==10.0.0.1 ||
> ip4.src==10.0.0.2) && (ip4.dst == 10.0.0.3 || ip4.dst == 10.0.0.4)' allow
>> +ovn-nbctl acl-add ls1 to-lport 3 '(ip4.src==10.0.0.1 ||
> ip4.src==10.0.0.42) && (ip4.dst == 10.0.0.3 || ip4.dst == 10.0.0.4)' allow
>> +ovn-nbctl --wait=hv sync
>> +
>> +# Traffic 10.0.0.1, 10.0.0.2 -> 10.0.0.3, 10.0.0.4 should be allowed.
>> +for src in `seq 1 2`; do
>> + for dst in `seq 3 4`; do
>> + sip=`ip_to_hex 10 0 0 $src`
>> + dip=`ip_to_hex 10 0 0 $dst`
>> +
>> + test_ip 1 f00000000001 f00000000002 $sip $dip 2
>> + done
>> +done
>> +
>> +# Traffic 10.0.0.1, 10.0.0.2 -> 10.0.0.5 should be dropped.
>> +dip=`ip_to_hex 10 0 0 5`
>> +for src in `seq 1 2`; do
>> + sip=`ip_to_hex 10 0 0 $src`
>> +
>> + test_ip 1 f00000000001 f00000000002 $sip $dip
>> +done
>> +
>> +cat 2.expected > expout
>> +$PYTHON "$ovs_srcdir/utilities/ovs-pcap.in" hv1/vif2-tx.pcap > 2.packets
>> +AT_CHECK([cat 2.packets], [0], [expout])
>> +reset_pcap_file hv1-vif2 hv1/vif2
>> +rm -f 2.packets
>> +> 2.expected
>> +
>> +# Add two less restrictive allow ACLs for src IP 10.0.0.1.
>> +ovn-nbctl acl-add ls1 to-lport 3 'ip4.src==10.0.0.1 ||
> ip4.src==10.0.0.1' allow
>> +ovn-nbctl acl-add ls1 to-lport 3 'ip4.src==10.0.0.1' allow
>> +ovn-nbctl --wait=hv sync
>> +
>> +# Check OVS flows, the less restrictive flows should have been installed.
>> +AT_CHECK([as hv1 ovs-ofctl dump-flows br-int table=45 | \
>> + grep "priority=1003" | awk '{print $7 " " $8}' | sort], [0], [dnl
>> +priority=1003,conj_id=2,ip,metadata=0x1 actions=resubmit(,46)
>> +priority=1003,conj_id=3,ip,metadata=0x1 actions=resubmit(,46)
>> +priority=1003,ip,metadata=0x1,nw_dst=10.0.0.3
> actions=conjunction(2,1/2),conjunction(3,1/2)
>> +priority=1003,ip,metadata=0x1,nw_dst=10.0.0.4
> actions=conjunction(2,1/2),conjunction(3,1/2)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.1 actions=resubmit(,46)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.2 actions=conjunction(2,2/2)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.42 actions=conjunction(3,2/2)
>> +])
>> +
>> +# Traffic 10.0.0.1, 10.0.0.2 -> 10.0.0.3, 10.0.0.4 should be allowed.
>> +for src in `seq 1 2`; do
>> + for dst in `seq 3 4`; do
>> + sip=`ip_to_hex 10 0 0 $src`
>> + dip=`ip_to_hex 10 0 0 $dst`
>> +
>> + test_ip 1 f00000000001 f00000000002 $sip $dip 2
>> + done
>> +done
>> +
>> +# Traffic 10.0.0.2 -> 10.0.0.5 should be dropped.
>> +sip=`ip_to_hex 10 0 0 2`
>> +dip=`ip_to_hex 10 0 0 5`
>> +test_ip 1 f00000000001 f00000000002 $sip $dip
>> +
>> +# Traffic 10.0.0.1 -> 10.0.0.5 should be allowed.
>> +sip=`ip_to_hex 10 0 0 1`
>> +dip=`ip_to_hex 10 0 0 5`
>> +test_ip 1 f00000000001 f00000000002 $sip $dip 2
>> +
>> +cat 2.expected > expout
>> +$PYTHON "$ovs_srcdir/utilities/ovs-pcap.in" hv1/vif2-tx.pcap > 2.packets
>> +AT_CHECK([cat 2.packets], [0], [expout])
>> +reset_pcap_file hv1-vif2 hv1/vif2
>> +rm -f 2.packets
>> +> 2.expected
>> +
>> +#sleep infinity
>> +
>> +# Remove the first less restrictive allow ACL.
>> +ovn-nbctl acl-del ls1 to-lport 3 'ip4.src==10.0.0.1 || ip4.src==10.0.0.1'
>> +ovn-nbctl --wait=hv sync
>> +
>> +# Check OVS flows, the second less restrictive allow ACL should have
> been installed.
>> +AT_CHECK([as hv1 ovs-ofctl dump-flows br-int table=45 | \
>> + grep "priority=1003" | awk '{print $7 " " $8}' | sort], [0], [dnl
>> +priority=1003,conj_id=2,ip,metadata=0x1 actions=resubmit(,46)
>> +priority=1003,conj_id=3,ip,metadata=0x1 actions=resubmit(,46)
>> +priority=1003,ip,metadata=0x1,nw_dst=10.0.0.3
> actions=conjunction(2,1/2),conjunction(3,1/2)
>> +priority=1003,ip,metadata=0x1,nw_dst=10.0.0.4
> actions=conjunction(2,1/2),conjunction(3,1/2)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.1 actions=resubmit(,46)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.2 actions=conjunction(2,2/2)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.42 actions=conjunction(3,2/2)
>> +])
>> +
>> +# Remove the less restrictive allow ACL.
>> +ovn-nbctl acl-del ls1 to-lport 3 'ip4.src==10.0.0.1'
>> +ovn-nbctl --wait=hv sync
>> +
>> +# Check OVS flows, the 10.0.0.1 conjunction should have been reinstalled.
>> +AT_CHECK([as hv1 ovs-ofctl dump-flows br-int table=45 | \
>> + grep "priority=1003" | awk '{print $7 " " $8}' | sort], [0], [dnl
>> +priority=1003,conj_id=2,ip,metadata=0x1 actions=resubmit(,46)
>> +priority=1003,conj_id=3,ip,metadata=0x1 actions=resubmit(,46)
>> +priority=1003,ip,metadata=0x1,nw_dst=10.0.0.3
> actions=conjunction(2,1/2),conjunction(3,1/2)
>> +priority=1003,ip,metadata=0x1,nw_dst=10.0.0.4
> actions=conjunction(2,1/2),conjunction(3,1/2)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.1
> actions=conjunction(2,2/2),conjunction(3,2/2)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.2 actions=conjunction(2,2/2)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.42 actions=conjunction(3,2/2)
>> +])
>> +
>> +# Traffic 10.0.0.1, 10.0.0.2 -> 10.0.0.3, 10.0.0.4 should be allowed.
>> +for src in `seq 1 2`; do
>> + for dst in `seq 3 4`; do
>> + sip=`ip_to_hex 10 0 0 $src`
>> + dip=`ip_to_hex 10 0 0 $dst`
>> +
>> + test_ip 1 f00000000001 f00000000002 $sip $dip 2
>> + done
>> +done
>> +
>> +# Traffic 10.0.0.1, 10.0.0.2 -> 10.0.0.5 should be dropped.
>> +dip=`ip_to_hex 10 0 0 5`
>> +for src in `seq 1 2`; do
>> + sip=`ip_to_hex 10 0 0 $src`
>> +
>> + test_ip 1 f00000000001 f00000000002 $sip $dip
>> +done
>> +
>> +cat 2.expected > expout
>> +$PYTHON "$ovs_srcdir/utilities/ovs-pcap.in" hv1/vif2-tx.pcap > 2.packets
>> +AT_CHECK([cat 2.packets], [0], [expout])
>> +
>> +# Re-add the less restrictive allow ACL for src IP 10.0.0.1
>> +ovn-nbctl acl-add ls1 to-lport 3 'ip4.src==10.0.0.1' allow
>> +ovn-nbctl --wait=hv sync
>> +
>> +# Check OVS flows, the less restrictive flows should have been installed.
>> +AT_CHECK([as hv1 ovs-ofctl dump-flows br-int table=45 | \
>> + grep "priority=1003" | awk '{print $7 " " $8}' | sort], [0], [dnl
>> +priority=1003,conj_id=2,ip,metadata=0x1 actions=resubmit(,46)
>> +priority=1003,conj_id=3,ip,metadata=0x1 actions=resubmit(,46)
>> +priority=1003,ip,metadata=0x1,nw_dst=10.0.0.3
> actions=conjunction(2,1/2),conjunction(3,1/2)
>> +priority=1003,ip,metadata=0x1,nw_dst=10.0.0.4
> actions=conjunction(2,1/2),conjunction(3,1/2)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.1 actions=resubmit(,46)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.2 actions=conjunction(2,2/2)
>> +priority=1003,ip,metadata=0x1,nw_src=10.0.0.42 actions=conjunction(3,2/2)
>> +])
>> +
>> +OVN_CLEANUP([hv1])
>> +AT_CLEANUP
>> +
>> # 3 hypervisors, one logical switch, 3 logical ports per hypervisor
>> AT_SETUP([ovn -- L2 Drop and Allow ACL w/ Stateful ACL])
>> ovn_start
>> --
>> 1.8.3.1
>>
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