Add a test to verify sampling packets via psample works.
In order to do that, create a subcommand in ovs-dpctl.py to listen to on the psample multicast group and print samples.
In order to also test simultaneous sFlow and psample actions, add missing parsing support for "userspace" action (via refactoring the one in sample).
Signed-off-by: Adrian Moreno amorenoz@redhat.com --- .../selftests/net/openvswitch/openvswitch.sh | 97 +++++++++- .../selftests/net/openvswitch/ovs-dpctl.py | 167 ++++++++++++++---- 2 files changed, 231 insertions(+), 33 deletions(-)
diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh index 5cae53543849..7a2307a384a9 100755 --- a/tools/testing/selftests/net/openvswitch/openvswitch.sh +++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh @@ -20,7 +20,8 @@ tests=" nat_related_v4 ip4-nat-related: ICMP related matches work with SNAT netlink_checks ovsnl: validate netlink attrs and settings upcall_interfaces ovs: test the upcall interfaces - drop_reason drop: test drop reasons are emitted" + drop_reason drop: test drop reasons are emitted + psample psample: Sampling packets with psample"
info() { [ $VERBOSE = 0 ] || echo $* @@ -170,6 +171,19 @@ ovs_drop_reason_count() return `echo "$perf_output" | grep "$pattern" | wc -l` }
+ovs_test_flow_fails () { + ERR_MSG="Flow actions may not be safe on all matching packets" + + PRE_TEST=$(dmesg | grep -c "${ERR_MSG}") + ovs_add_flow $@ &> /dev/null $@ && return 1 + POST_TEST=$(dmesg | grep -c "${ERR_MSG}") + + if [ "$PRE_TEST" == "$POST_TEST" ]; then + return 1 + fi + return 0 +} + usage() { echo echo "$0 [OPTIONS] [TEST]..." @@ -184,6 +198,87 @@ usage() { exit 1 }
+ +# psample test +# - samples packets with psample +test_psample() { + sbx_add "test_psample" || return $? + + # Add a datapath with per-vport dispatching. + ovs_add_dp "test_psample" psample -V 2:1 || return 1 + + info "create namespaces" + ovs_add_netns_and_veths "test_psample" "psample" \ + client c0 c1 172.31.110.10/24 -u || return 1 + ovs_add_netns_and_veths "test_psample" "psample" \ + server s0 s1 172.31.110.20/24 -u || return 1 + + # Check if psample actions can be configured. + ovs_add_flow "test_psample" psample \ + 'in_port(1),eth(),eth_type(0x0806),arp()' 'sample(sample=100%,group_id=1,cookie=0102)' + if [ $? == 1 ]; then + info "no support for psample - skipping" + ovs_exit_sig + return $ksft_skip + fi + + ovs_del_flows "test_psample" psample + + # Allow ARP + ovs_add_flow "test_psample" psample \ + 'in_port(1),eth(),eth_type(0x0806),arp()' '2' || return 1 + ovs_add_flow "test_psample" psample \ + 'in_port(2),eth(),eth_type(0x0806),arp()' '1' || return 1 + + # Test action verification. + OLDIFS=$IFS + IFS='*' + min_key='in_port(1),eth(),eth_type(0x800),ipv4()' + for testcase in \ + "cookie to large"*"sample(sample=100%,group_id=1,cookie=1615141312111009080706050403020100)" \ + "no group or action"*"sample(sample=100%)" \ + "no group or action with cookie"*"sample(sample=100%,cookie=deadbeef)"; + do + set -- $testcase; + ovs_test_flow_fails "test_psample" psample $min_key $2 + if [ $? == 1 ]; then + info "failed - $1" + return 1 + fi + done + IFS=$OLDIFS + + # Sample all traffic. In this case the sample action only has psample + # arguments. + ovs_add_flow "test_psample" psample \ + "in_port(1),eth(),eth_type(0x0800),ipv4(src=172.31.110.10,proto=1),icmp()" "sample(sample=100%,group_id=1,cookie=c0ffee),2" + + # Sample all traffic. In this case the sample action has both psample + # arguments and an upcall emulating simultaneous psample and + # sFlow / IPFIX. + nlpid=$(grep -E "listening on upcall packet handler" $ovs_dir/s0.out | cut -d ":" -f 2 | tr -d ' ') + ovs_add_flow "test_psample" psample \ + "in_port(2),eth(),eth_type(0x0800),ipv4(src=172.31.110.20,proto=1),icmp()" "sample(sample=100%,group_id=2,cookie=eeff0c,actions(userspace(pid=${nlpid},userdata=eeff0c))),1" + + # Record psample data. + python3 $ovs_base/ovs-dpctl.py psample >$ovs_dir/psample.out 2>$ovs_dir/psample.err & + pid=$! + on_exit "ovs_sbx test_psample kill -TERM $pid 2>/dev/null" + + # Send a single ping. + sleep 1 + ovs_sbx "test_psample" ip netns exec client ping -I c1 172.31.110.20 -c 1 || return 1 + sleep 1 + + # We should have received one userspace action upcall and 2 psample packets. + grep -E "userspace action command" $ovs_dir/s0.out >/dev/null 2>&1 || return 1 + + grep -E "rate:1,group:1,cookie:c0ffee" $ovs_dir/psample.out >/dev/null 2>&1 || return 1 + grep -E "rate:1,group:2,cookie:eeff0c" $ovs_dir/psample.out >/dev/null 2>&1 || return 1 + + return 0 +} + # drop_reason test # - drop packets and verify the right drop reason is reported test_drop_reason() { diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py index 3a2dddc57e42..2fb5bcfe9c36 100644 --- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py +++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py @@ -27,8 +27,10 @@ try: from pyroute2.netlink import genlmsg from pyroute2.netlink import nla from pyroute2.netlink import nlmsg_atoms - from pyroute2.netlink.exceptions import NetlinkError + from pyroute2.netlink.event import EventSocket from pyroute2.netlink.generic import GenericNetlinkSocket + from pyroute2.netlink.nlsocket import Marshal + from pyroute2.netlink.exceptions import NetlinkError import pyroute2
except ModuleNotFoundError: @@ -269,6 +271,47 @@ def parse_extract_field( return str_skipped, data
+def parse_attributes(actstr, attributes): + """Parses actstr according to attribute description. attributes must be + a list of tuples (name, attribute, parse_func), e.g: + ("pid", OVS_USERSPACE_ATTR_PID, int) + + Returns a list of parsed attributes followed by the remaining string. + """ + attrs = [] + for (key, attr, func) in attributes: + if not actstr.startswith(key): + continue + + actstr = actstr[len(key) :] + + if not func: + attrs.append([attr]) + continue + + # The length of complex attributes cannot be determined + # beforehand and must be reported by the parsing func. + delim = actstr[0] + actstr = actstr[1:] + if delim == "=": + pos = strcspn(actstr, ",)") + datum = func(actstr[:pos]) + elif delim == "(": + datum, pos = func(actstr) + + attrs.append([attr, datum]) + actstr = actstr[pos:] + + if delim == "(": + actstr = actstr[1:] + + actstr = actstr[strspn(actstr, ", ") :] + + if actstr[0] != ")": + raise ValueError("Action str: '%s' unbalanced" % actstr) + + return attrs, actstr[1:] + class ovs_dp_msg(genlmsg): # include the OVS version # We need a custom header rather than just being able to rely on @@ -357,41 +400,19 @@ class ovsactions(nla): percent = float(percent.strip('%')) return int(math.floor(UINT32_MAX * (percent / 100.0) + .5))
- for (key, attr, func) in ( + attrs_desc = ( ("sample", "OVS_SAMPLE_ATTR_PROBABILITY", percent_to_rate), ("group_id", "OVS_SAMPLE_ATTR_PSAMPLE_GROUP", int), ("cookie", "OVS_SAMPLE_ATTR_PSAMPLE_COOKIE", lambda x: list(bytearray.fromhex(x))), ("actions", "OVS_SAMPLE_ATTR_ACTIONS", parse_nested_actions), - ): - if not actstr.startswith(key): - continue - - actstr = actstr[len(key) :] - - if not func: - self["attrs"].append([attr, None]) - continue - - # The length of complex attributes cannot be determined - # beforehand and must be reported by the parsing func. - delim = actstr[0] - actstr = actstr[1:] - if delim == "=": - pos = strcspn(actstr, ",)") - datum = func(actstr[:pos]) - elif delim == "(": - datum, pos = func(actstr) - - self["attrs"].append([attr, datum]) - actstr = actstr[pos:] - actstr = actstr[strspn(actstr, ", ") :] - - if actstr[0] != ")": - raise ValueError("Action str: '%s' unbalanced" % actstr) + )
- return actstr[1:] + attrs, actstr = parse_attributes(actstr, attrs_desc) + for attr in attrs: + self["attrs"].append(attr)
+ return actstr
class ctact(nla): nla_flags = NLA_F_NESTED @@ -521,6 +542,18 @@ class ovsactions(nla): print_str += ")" return print_str
+ def parse(self, actstr): + attrs_desc = ( + ("pid", "OVS_USERSPACE_ATTR_PID", int), + ("userdata", "OVS_USERSPACE_ATTR_USERDATA", + lambda x: list(bytearray.fromhex(x))), + ("egress_tun_port", "OVS_USERSPACE_ATTR_EGRESS_TUN_PORT", int) + ) + attrs, actstr = parse_attributes(actstr, attrs_desc) + for attr in attrs: + self["attrs"].append(attr) + return actstr + def dpstr(self, more=False): print_str = ""
@@ -730,6 +763,11 @@ class ovsactions(nla): self["attrs"].append(["OVS_ACTION_ATTR_SAMPLE", sampleact]) parsed = True
+ elif parse_starts_block(actstr, "userspace(", False): + uact = self.userspace() + actstr = uact.parse(actstr[len("userpsace(") : ]) + self["attrs"].append(["OVS_ACTION_ATTR_USERSPACE", uact]) + parsed = True
actstr = actstr[strspn(actstr, ", ") :] while parencount > 0: @@ -2112,10 +2150,70 @@ class OvsFlow(GenericNetlinkSocket): print("MISS upcall[%d/%s]: %s" % (seq, pktpres, keystr), flush=True)
def execute(self, packetmsg): - print("userspace execute command") + print("userspace execute command", flush=True)
def action(self, packetmsg): - print("userspace action command") + print("userspace action command", flush=True) + + +class psample_sample(genlmsg): + nla_map = ( + ("PSAMPLE_ATTR_IIFINDEX", "none"), + ("PSAMPLE_ATTR_OIFINDEX", "none"), + ("PSAMPLE_ATTR_ORIGSIZE", "none"), + ("PSAMPLE_ATTR_SAMPLE_GROUP", "uint32"), + ("PSAMPLE_ATTR_GROUP_SEQ", "none"), + ("PSAMPLE_ATTR_SAMPLE_RATE", "uint32"), + ("PSAMPLE_ATTR_DATA", "array(uint8)"), + ("PSAMPLE_ATTR_GROUP_REFCOUNT", "none"), + ("PSAMPLE_ATTR_TUNNEL", "none"), + ("PSAMPLE_ATTR_PAD", "none"), + ("PSAMPLE_ATTR_OUT_TC", "none"), + ("PSAMPLE_ATTR_OUT_TC_OCC", "none"), + ("PSAMPLE_ATTR_LATENCY", "none"), + ("PSAMPLE_ATTR_TIMESTAMP", "none"), + ("PSAMPLE_ATTR_PROTO", "none"), + ("PSAMPLE_ATTR_USER_COOKIE", "array(uint8)"), + ) + + def dpstr(self): + fields = [] + data = "" + for (attr, value) in self["attrs"]: + if attr == "PSAMPLE_ATTR_SAMPLE_GROUP": + fields.append("group:%d" % value) + if attr == "PSAMPLE_ATTR_SAMPLE_RATE": + fields.append("rate:%d" % value) + if attr == "PSAMPLE_ATTR_USER_COOKIE": + value = "".join(format(x, "02x") for x in value) + fields.append("cookie:%s" % value) + if attr == "PSAMPLE_ATTR_DATA" and len(value) > 0: + data = "data:%s" % "".join(format(x, "02x") for x in value) + + return ("%s %s" % (",".join(fields), data)).strip() + + +class psample_msg(Marshal): + PSAMPLE_CMD_SAMPLE = 0 + PSAMPLE_CMD_GET_GROUP = 1 + PSAMPLE_CMD_NEW_GROUP = 2 + PSAMPLE_CMD_DEL_GROUP = 3 + PSAMPLE_CMD_SET_FILTER = 4 + msg_map = {PSAMPLE_CMD_SAMPLE: psample_sample} + + +class Psample(EventSocket): + genl_family = "psample" + mcast_groups = ["packets"] + marshal_class = psample_msg + + def read_samples(self): + while True: + try: + for msg in self.get(): + print(msg.dpstr(), flush=True) + except NetlinkError as ne: + raise ne
def print_ovsdp_full(dp_lookup_rep, ifindex, ndb=NDB(), vpl=OvsVport()): @@ -2175,7 +2273,7 @@ def main(argv): help="Increment 'verbose' output counter.", default=0, ) - subparsers = parser.add_subparsers() + subparsers = parser.add_subparsers(dest="subcommand")
showdpcmd = subparsers.add_parser("show") showdpcmd.add_argument( @@ -2232,6 +2330,8 @@ def main(argv): delfscmd = subparsers.add_parser("del-flows") delfscmd.add_argument("flsbr", help="Datapath name")
+ subparsers.add_parser("psample") + args = parser.parse_args()
if args.verbose > 0: @@ -2246,6 +2346,9 @@ def main(argv):
sys.setrecursionlimit(100000)
+ if args.subcommand == "psample": + Psample().read_samples() + if hasattr(args, "showdp"): found = False for iface in ndb.interfaces: