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Message-ID: <20241104072753.77042-1-deliran@verdict.gg>
Date: Mon, 4 Nov 2024 07:27:50 +0000
From: Vladimir Vdovin <deliran@...dict.gg>
To: netdev@...r.kernel.org,
dsahern@...nel.org,
davem@...emloft.net,
idosch@...sch.org
Cc: Vladimir Vdovin <deliran@...dict.gg>,
edumazet@...gle.com,
linux-kselftest@...r.kernel.org,
kuba@...nel.org,
pabeni@...hat.com,
shuah@...nel.org,
horms@...nel.org
Subject: [PATCH net-next v7] net: ipv4: Cache pmtu for all packet paths if multipath enabled
Check number of paths by fib_info_num_path(),
and update_or_create_fnhe() for every path.
Problem is that pmtu is cached only for the oif
that has received icmp message "need to frag",
other oifs will still try to use "default" iface mtu.
An example topology showing the problem:
| host1
+---------+
| dummy0 | 10.179.20.18/32 mtu9000
+---------+
+-----------+----------------+
+---------+ +---------+
| ens17f0 | 10.179.2.141/31 | ens17f1 | 10.179.2.13/31
+---------+ +---------+
| (all here have mtu 9000) |
+------+ +------+
| ro1 | 10.179.2.140/31 | ro2 | 10.179.2.12/31
+------+ +------+
| |
---------+------------+-------------------+------
|
+-----+
| ro3 | 10.10.10.10 mtu1500
+-----+
|
========================================
some networks
========================================
|
+-----+
| eth0| 10.10.30.30 mtu9000
+-----+
| host2
host1 have enabled multipath and
sysctl net.ipv4.fib_multipath_hash_policy = 1:
default proto static src 10.179.20.18
nexthop via 10.179.2.12 dev ens17f1 weight 1
nexthop via 10.179.2.140 dev ens17f0 weight 1
When host1 tries to do pmtud from 10.179.20.18/32 to host2,
host1 receives at ens17f1 iface an icmp packet from ro3 that ro3 mtu=1500.
And host1 caches it in nexthop exceptions cache.
Problem is that it is cached only for the iface that has received icmp,
and there is no way that ro3 will send icmp msg to host1 via another path.
Host1 now have this routes to host2:
ip r g 10.10.30.30 sport 30000 dport 443
10.10.30.30 via 10.179.2.12 dev ens17f1 src 10.179.20.18 uid 0
cache expires 521sec mtu 1500
ip r g 10.10.30.30 sport 30033 dport 443
10.10.30.30 via 10.179.2.140 dev ens17f0 src 10.179.20.18 uid 0
cache
So when host1 tries again to reach host2 with mtu>1500,
if packet flow is lucky enough to be hashed with oif=ens17f1 its ok,
if oif=ens17f0 it blackholes and still gets icmp msgs from ro3 to ens17f1,
until lucky day when ro3 will send it through another flow to ens17f0.
Signed-off-by: Vladimir Vdovin <deliran@...dict.gg>
---
V7:
selftest in pmtu.sh:
- add setup_multipath() with old and new nh tests
- add global "dummy_v4" addr variables
- add documentation
- remove dummy netdev usage in mp nh test
- remove useless sysctl opts in mp nh test
V6:
- make commit message cleaner
V5:
- make self test cleaner
V4:
- fix selftest, do route lookup before checking cached exceptions
V3:
- add selftest
- fix compile error
V2:
- fix fib_info_num_path parameter pass
---
net/ipv4/route.c | 13 ++++
tools/testing/selftests/net/pmtu.sh | 95 ++++++++++++++++++++++++++++-
2 files changed, 107 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 723ac9181558..652f603d29fe 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1027,6 +1027,19 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
struct fib_nh_common *nhc;
fib_select_path(net, &res, fl4, NULL);
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+ if (fib_info_num_path(res.fi) > 1) {
+ int nhsel;
+
+ for (nhsel = 0; nhsel < fib_info_num_path(res.fi); nhsel++) {
+ nhc = fib_info_nhc(res.fi, nhsel);
+ update_or_create_fnhe(nhc, fl4->daddr, 0, mtu, lock,
+ jiffies + net->ipv4.ip_rt_mtu_expires);
+ }
+ rcu_read_unlock();
+ return;
+ }
+#endif /* CONFIG_IP_ROUTE_MULTIPATH */
nhc = FIB_RES_NHC(res);
update_or_create_fnhe(nhc, fl4->daddr, 0, mtu, lock,
jiffies + net->ipv4.ip_rt_mtu_expires);
diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
index 569bce8b6383..f24c84184c61 100755
--- a/tools/testing/selftests/net/pmtu.sh
+++ b/tools/testing/selftests/net/pmtu.sh
@@ -197,6 +197,12 @@
#
# - pmtu_ipv6_route_change
# Same as above but with IPv6
+#
+# - pmtu_ipv4_mp_exceptions
+# Use the same topology as in pmtu_ipv4, but add routeable "dummy"
+# addresses on host A and B on lo0 reachable via both routers.
+# Host A and B "dummy" addresses have multipath routes to each other.
+# Check that PMTU exceptions are created for both paths.
source lib.sh
source net_helper.sh
@@ -266,7 +272,8 @@ tests="
list_flush_ipv4_exception ipv4: list and flush cached exceptions 1
list_flush_ipv6_exception ipv6: list and flush cached exceptions 1
pmtu_ipv4_route_change ipv4: PMTU exception w/route replace 1
- pmtu_ipv6_route_change ipv6: PMTU exception w/route replace 1"
+ pmtu_ipv6_route_change ipv6: PMTU exception w/route replace 1
+ pmtu_ipv4_mp_exceptions ipv4: PMTU multipath nh exceptions 1"
# Addressing and routing for tests with routers: four network segments, with
# index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an
@@ -343,6 +350,9 @@ tunnel6_a_addr="fd00:2::a"
tunnel6_b_addr="fd00:2::b"
tunnel6_mask="64"
+dummy4_a_addr="192.168.99.99"
+dummy4_b_addr="192.168.88.88"
+
dummy6_0_prefix="fc00:1000::"
dummy6_1_prefix="fc00:1001::"
dummy6_mask="64"
@@ -984,6 +994,50 @@ setup_ovs_bridge() {
run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2
}
+setup_multipath() {
+ if [ "$USE_NH" = "yes" ]; then
+ setup_multipath_new
+ else
+ setup_multipath_old
+ fi
+
+ # Set up routers with routes to dummies
+ run_cmd ${ns_r1} ip route add ${dummy4_a_addr} via ${prefix4}.${a_r1}.1
+ run_cmd ${ns_r2} ip route add ${dummy4_a_addr} via ${prefix4}.${a_r2}.1
+ run_cmd ${ns_r1} ip route add ${dummy4_b_addr} via ${prefix4}.${b_r1}.1
+ run_cmd ${ns_r2} ip route add ${dummy4_b_addr} via ${prefix4}.${b_r2}.1
+}
+
+setup_multipath_new() {
+ # Set up host A with multipath routes to host B dummy4_b_addr
+ run_cmd ${ns_a} ip addr add ${dummy4_a_addr} dev lo0
+ run_cmd ${ns_a} ip nexthop add id 201 via ${prefix4}.${a_r1}.2 dev veth_A-R1
+ run_cmd ${ns_a} ip nexthop add id 202 via ${prefix4}.${a_r2}.2 dev veth_A-R2
+ run_cmd ${ns_a} ip nexthop add id 203 group 201/202
+ run_cmd ${ns_a} ip route add ${dummy4_b_addr} nhid 203
+
+ # Set up host B with multipath routes to host A dummy4_a_addr
+ run_cmd ${ns_b} ip addr add ${dummy4_b_addr} dev lo0
+ run_cmd ${ns_b} ip nexthop add id 201 via ${prefix4}.${b_r1}.2 dev veth_A-R1
+ run_cmd ${ns_b} ip nexthop add id 202 via ${prefix4}.${b_r2}.2 dev veth_A-R2
+ run_cmd ${ns_b} ip nexthop add id 203 group 201/202
+ run_cmd ${ns_b} ip route add ${dummy4_a_addr} nhid 203
+}
+
+setup_multipath_old() {
+ # Set up host A with multipath routes to host B dummy4_b_addr
+ run_cmd ${ns_a} ip addr add ${dummy4_a_addr} dev lo0
+ run_cmd ${ns_a} ip route add ${dummy4_b_addr} \
+ nexthop via ${prefix4}.${a_r1}.2 weight 1 \
+ nexthop via ${prefix4}.${a_r2}.2 weight 1
+
+ # Set up host B with multipath routes to host A dummy4_a_addr
+ run_cmd ${ns_b} ip addr add ${dummy4_b_addr} dev lo0
+ run_cmd ${ns_a} ip route add ${dummy4_a_addr} \
+ nexthop via ${prefix4}.${a_b1}.2 weight 1 \
+ nexthop via ${prefix4}.${a_b2}.2 weight 1
+}
+
setup() {
[ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
@@ -2329,6 +2383,45 @@ test_pmtu_ipv6_route_change() {
test_pmtu_ipvX_route_change 6
}
+test_pmtu_ipv4_mp_exceptions() {
+ setup namespaces routing multipath || return $ksft_skip
+
+ trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
+ "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
+ "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
+
+ # Set up initial MTU values
+ mtu "${ns_a}" veth_A-R1 2000
+ mtu "${ns_r1}" veth_R1-A 2000
+ mtu "${ns_r1}" veth_R1-B 1400
+ mtu "${ns_b}" veth_B-R1 1400
+
+ mtu "${ns_a}" veth_A-R2 2000
+ mtu "${ns_r2}" veth_R2-A 2000
+ mtu "${ns_r2}" veth_R2-B 1500
+ mtu "${ns_b}" veth_B-R2 1500
+
+ fail=0
+
+ # Ping and expect two nexthop exceptions for two routes in nh group
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -c 1 -s 1800 "${dummy4_b_addr}"
+
+ # Do route lookup before checking cached exceptions.
+ # The following commands are needed for dst entries to be cached
+ # in both paths exceptions and therefore dumped to user space
+ run_cmd ${ns_a} ip route get ${dummy4_b_addr} oif veth_A-R1
+ run_cmd ${ns_a} ip route get ${dummy4_b_addr} oif veth_A-R2
+
+ # Check cached exceptions
+ if [ "$(${ns_a} ip -oneline route list cache | grep mtu | wc -l)" -ne 2 ]; then
+ err " there are not enough cached exceptions"
+ fail=1
+ fi
+
+ return ${fail}
+}
+
usage() {
echo
echo "$0 [OPTIONS] [TEST]..."
base-commit: 66600fac7a984dea4ae095411f644770b2561ede
--
2.43.5
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