On netdev datapath, when a ct element was cleaned, the cmap
could be shrinked, potentially causing some elements to be skipped
in the flush iteration.
Fixes: 967bb5c5cd90 ("conntrack: Add rcu support.")
Signed-off-by: Xavier Simonart <[email protected]>
---
v2: - Updated commit message.
- Use compose-packet instead of hex packet content.
- Use dnl for comments.
- Remove unnecessary errors in OVS_TRAFFIC_VSWITCHD_STOP.
- Rebased on origin/master.
---
lib/conntrack.c | 14 ++++--------
lib/conntrack.h | 1 +
tests/system-traffic.at | 47 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 52 insertions(+), 10 deletions(-)
diff --git a/lib/conntrack.c b/lib/conntrack.c
index 8a7056bac..5786424f6 100644
--- a/lib/conntrack.c
+++ b/lib/conntrack.c
@@ -2651,25 +2651,19 @@ conntrack_dump_start(struct conntrack *ct, struct
conntrack_dump *dump,
dump->ct = ct;
*ptot_bkts = 1; /* Need to clean up the callers. */
+ dump->cursor = cmap_cursor_start(&ct->conns);
return 0;
}
int
conntrack_dump_next(struct conntrack_dump *dump, struct ct_dpif_entry *entry)
{
- struct conntrack *ct = dump->ct;
long long now = time_msec();
- for (;;) {
- struct cmap_node *cm_node = cmap_next_position(&ct->conns,
- &dump->cm_pos);
- if (!cm_node) {
- break;
- }
- struct conn_key_node *keyn;
- struct conn *conn;
+ struct conn_key_node *keyn;
+ struct conn *conn;
- INIT_CONTAINER(keyn, cm_node, cm_node);
+ CMAP_CURSOR_FOR_EACH_CONTINUE (keyn, cm_node, &dump->cursor) {
if (keyn->dir != CT_DIR_FWD) {
continue;
}
diff --git a/lib/conntrack.h b/lib/conntrack.h
index ee7da099e..aa12a1847 100644
--- a/lib/conntrack.h
+++ b/lib/conntrack.h
@@ -109,6 +109,7 @@ struct conntrack_dump {
union {
struct cmap_position cm_pos;
struct hmap_position hmap_pos;
+ struct cmap_cursor cursor;
};
bool filter_zone;
uint16_t zone;
diff --git a/tests/system-traffic.at b/tests/system-traffic.at
index 98e494abf..34f93b2e5 100644
--- a/tests/system-traffic.at
+++ b/tests/system-traffic.at
@@ -8389,6 +8389,53 @@ AT_CHECK([ovs-pcap client.pcap | grep
000000002010000000002000], [0], [dnl
OVS_TRAFFIC_VSWITCHD_STOP
AT_CLEANUP
+AT_SETUP([conntrack - Flush many conntrack entries by port])
+CHECK_CONNTRACK()
+OVS_TRAFFIC_VSWITCHD_START()
+
+ADD_NAMESPACES(at_ns0, at_ns1)
+
+ADD_VETH(p0, at_ns0, br0, "10.1.1.1/24")
+ADD_VETH(p1, at_ns1, br0, "10.1.1.2/24")
+
+AT_DATA([flows.txt], [dnl
+priority=100,in_port=1,udp,action=ct(zone=1,commit),2
+])
+
+AT_CHECK([ovs-ofctl --bundle add-flows br0 flows.txt])
+
+dnl 20 packets from port 1 and 1 packet from port 2.
+flow_l3="\
+ eth_src=50:54:00:00:00:09,eth_dst=50:54:00:00:00:0a,dl_type=0x0800,\
+ nw_src=10.1.1.1,nw_dst=10.1.1.2,nw_proto=17,nw_ttl=64,nw_frag=no"
+
+for i in $(seq 1 20); do
+ frame=$(ovs-ofctl compose-packet --bare "$flow_l3, udp_src=1,udp_dst=$i")
+ AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=1 packet=$frame
actions=resubmit(,0)"])
+done
+frame=$(ovs-ofctl compose-packet --bare "$flow_l3, udp_src=2,udp_dst=1")
+AT_CHECK([ovs-ofctl -O OpenFlow13 packet-out br0 "in_port=1 packet=$frame
actions=resubmit(,0)"])
+
+: > conntrack
+
+for i in $(seq 1 20); do
+ echo
"udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=1,dport=${i}),reply=(src=10.1.1.2,dst=10.1.1.1,sport=${i},dport=1),zone=1"
>> conntrack
+done
+echo
"udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=2,dport=1),reply=(src=10.1.1.2,dst=10.1.1.1,sport=1,dport=2),zone=1"
>> conntrack
+
+sort conntrack > expout
+
+AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep -F "src=10.1.1.1," | sort ],
[0], [expout])
+
+dnl Check that flushing conntrack by port 1 flush all ct for port 1 but keeps
ct for port 2.
+AT_CHECK([ovs-appctl dpctl/flush-conntrack 'ct_nw_proto=17,ct_tp_src=1'])
+AT_CHECK([ovs-appctl dpctl/dump-conntrack | grep -F "src=10.1.1.1," | sort ],
[0], [dnl
+udp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=2,dport=1),reply=(src=10.1.1.2,dst=10.1.1.1,sport=1,dport=2),zone=1
+])
+
+OVS_TRAFFIC_VSWITCHD_STOP
+AT_CLEANUP
+
AT_BANNER([IGMP])
AT_SETUP([IGMP - flood under normal action])
--
2.41.0
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