From df2c57d43d758f26204c3048b278fa546a4858f8 Mon Sep 17 00:00:00 2001
From: Dumitru Ceara <dceara@redhat.com>
Date: Tue, 20 Oct 2020 16:54:32 +0200
Subject: [PATCH] ovn-northd: Handle IPv6 addresses with prefixes for port
security.
Reported-by: Rodolfo Alonso <ralonsoh@redhat.com>
Reported-at: https://bugzilla.redhat.com/1856898
CC: Numan Siddique <numans@ovn.org>
Fixes: f631376bf75d ("ovn-northd: Handle IPv4 addresses with prefixes in lport port security")
Signed-off-by: Dumitru Ceara <dceara@redhat.com>
Signed-off-by: Numan Siddique <numans@ovn.org>
(cherry picked from upstream commit 45ed5a3cd500bf94706507d3d10f63ea133cbc29)
Change-Id: Icaa1b299a0a2a7006532e37575f20d5a1f25787c
---
lib/ovn-l7.h | 11 +++++++++++
northd/ovn-northd.c | 35 ++++++++++++++++++++++++++++-------
tests/ovn.at | 40 +++++++++++++++++++++++++++++++---------
3 files changed, 70 insertions(+), 16 deletions(-)
diff --git a/lib/ovn-l7.h b/lib/ovn-l7.h
index 30a7955..9b729db 100644
--- a/lib/ovn-l7.h
+++ b/lib/ovn-l7.h
@@ -428,6 +428,17 @@ ipv6_addr_is_routable_multicast(const struct in6_addr *ip) {
}
}
+static inline bool
+ipv6_addr_is_host_zero(const struct in6_addr *prefix,
+ const struct in6_addr *mask)
+{
+ /* host-bits-non-zero <=> (prefix ^ mask) & prefix. */
+ struct in6_addr tmp = ipv6_addr_bitxor(prefix, mask);
+
+ tmp = ipv6_addr_bitand(&tmp, prefix);
+ return ipv6_is_zero(&tmp);
+}
+
#define IPV6_EXT_HEADER_LEN 8
struct ipv6_ext_header {
uint8_t ip6_nxt_proto;
diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
index 3a71d0e..7cd2f9f 100644
--- a/northd/ovn-northd.c
+++ b/northd/ovn-northd.c
@@ -4285,10 +4285,20 @@ build_port_security_ipv6_nd_flow(
ipv6_string_mapped(ip6_str, &lla);
ds_put_format(match, " && (nd.target == %s", ip6_str);
- for(int i = 0; i < n_ipv6_addrs; i++) {
- memset(ip6_str, 0, sizeof(ip6_str));
- ipv6_string_mapped(ip6_str, &ipv6_addrs[i].addr);
- ds_put_format(match, " || nd.target == %s", ip6_str);
+ for (size_t i = 0; i < n_ipv6_addrs; i++) {
+ /* When the netmask is applied, if the host portion is
+ * non-zero, the host can only use the specified
+ * address in the nd.target. If zero, the host is allowed
+ * to use any address in the subnet.
+ */
+ if (ipv6_addrs[i].plen == 128
+ || !ipv6_addr_is_host_zero(&ipv6_addrs[i].addr,
+ &ipv6_addrs[i].mask)) {
+ ds_put_format(match, " || nd.target == %s", ipv6_addrs[i].addr_s);
+ } else {
+ ds_put_format(match, " || nd.target == %s/%d",
+ ipv6_addrs[i].network_s, ipv6_addrs[i].plen);
+ }
}
ds_put_format(match, ")))");
@@ -4314,9 +4324,20 @@ build_port_security_ipv6_flow(
if (pipeline == P_OUT) {
ds_put_cstr(match, "ff00::/8, ");
}
- for(int i = 0; i < n_ipv6_addrs; i++) {
- ipv6_string_mapped(ip6_str, &ipv6_addrs[i].addr);
- ds_put_format(match, "%s, ", ip6_str);
+ for (size_t i = 0; i < n_ipv6_addrs; i++) {
+ /* When the netmask is applied, if the host portion is
+ * non-zero, the host can only use the specified
+ * address. If zero, the host is allowed to use any
+ * address in the subnet.
+ */
+ if (ipv6_addrs[i].plen == 128
+ || !ipv6_addr_is_host_zero(&ipv6_addrs[i].addr,
+ &ipv6_addrs[i].mask)) {
+ ds_put_format(match, "%s, ", ipv6_addrs[i].addr_s);
+ } else {
+ ds_put_format(match, "%s/%d, ", ipv6_addrs[i].network_s,
+ ipv6_addrs[i].plen);
+ }
}
/* Replace ", " by "}". */
ds_chomp(match, ' ');
diff --git a/tests/ovn.at b/tests/ovn.at
index 337ab4e..2c6f7cc 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -4133,10 +4133,10 @@ for i in 1 2 3; do
if test $j = 1; then
ovn-nbctl lsp-set-addresses lp$i$j "f0:00:00:00:00:$i$j 192.168.0.$i$j" unknown
elif test $j = 2; then
- ovn-nbctl lsp-set-addresses lp$i$j "f0:00:00:00:00:$i$j 192.168.0.$i$j"
+ ovn-nbctl lsp-set-addresses lp$i$j "f0:00:00:00:00:$i$j 192.168.0.$i$j 4343::00$i$j"
ovn-nbctl lsp-set-port-security lp$i$j f0:00:00:00:00:$i$j
else
- extra_addr="f0:00:00:00:0$i:$i$j fe80::ea2a:eaff:fe28:$i$j"
+ extra_addr="f0:00:00:00:0$i:$i$j fe80::ea2a:eaff:fe28:$i$j 4242::00$i$j"
ovn-nbctl lsp-set-addresses lp$i$j "f0:00:00:00:00:$i$j 192.168.0.$i$j" "$extra_addr"
ovn-nbctl lsp-set-port-security lp$i$j "f0:00:00:00:00:$i$j 192.168.0.$i$j" "$extra_addr"
fi
@@ -4352,7 +4352,7 @@ for i in 1 2 3; do
done
# lp13 has extra port security with mac f0000000113 and ipv6 addr
-# fe80::ea2a:eaff:fe28:0012
+# fe80::ea2a:eaff:fe28:0012 and 4242::0013
# ipv4 packet should be dropped for lp13 with mac f0000000113
sip=`ip_to_hex 192 168 0 13`
@@ -4366,20 +4366,24 @@ sip=ee800000000000000000000000000000
for i in 1 2 3; do
tip=fe80000000000000ea2aeafffe2800${i}3
test_ipv6 11 f00000000011 f00000000${i}${i}3 $sip $tip ${i}3
+ tip=424200000000000000000000000000${i}3
+ test_ipv6 11 f00000000011 f00000000${i}${i}3 $sip $tip ${i}3
done
# ipv6 packet should not be received by lp33 with mac f0000000333
-# and ip6.dst as fe80::ea2a:eaff:fe28:0023 as it is
-# configured with fe80::ea2a:eaff:fe28:0033
+# and ip6.dst as fe80::ea2a:eaff:fe28:0023 or 4242::0023 as it is
+# configured with fe80::ea2a:eaff:fe28:0033 and 4242::0033
# lp11 can send ipv6 traffic as there is no port security
sip=ee800000000000000000000000000000
tip=fe80000000000000ea2aeafffe280023
test_ipv6 11 f00000000011 f00000000333 $sip $tip
+tip=42420000000000000000000000000023
+test_ipv6 11 f00000000011 f00000000333 $sip $tip
# ipv6 packet should be allowed for lp[123]3 with mac f0000000${i}${i}3
-# and ip6.src fe80::ea2a:eaff:fe28:0${i}${i}3 and ip6.src ::.
+# and ip6.src fe80::ea2a:eaff:fe28:0${i}${i}3, 4242::00${i}3 and ip6.src ::.
# and should be dropped for any other ip6.src
# lp21 can receive ipv6 traffic as there is no port security
@@ -4387,6 +4391,8 @@ tip=ee800000000000000000000000000000
for i in 1 2 3; do
sip=fe80000000000000ea2aeafffe2800${i}3
test_ipv6 ${i}3 f00000000${i}${i}3 f00000000021 $sip $tip 21
+ sip=424200000000000000000000000000${i}3
+ test_ipv6 ${i}3 f00000000${i}${i}3 f00000000021 $sip $tip 21
# Test ICMPv6 MLD reports (v1 and v2) and NS for DAD
sip=00000000000000000000000000000000
@@ -4404,9 +4410,7 @@ for i in 1 2 3; do
done
# configure lsp13 to send and received IPv4 packets with an address range
-ovn-nbctl lsp-set-port-security lp13 "f0:00:00:00:00:13 192.168.0.13 20.0.0.4/24 10.0.0.0/24"
-
-sleep 2
+ovn-nbctl --wait=hv lsp-set-port-security lp13 "f0:00:00:00:00:13 192.168.0.13 20.0.0.4/24 10.0.0.0/24 4242::/64"
sip=`ip_to_hex 10 0 0 13`
tip=`ip_to_hex 192 168 0 22`
@@ -4419,12 +4423,24 @@ tip=`ip_to_hex 192 168 0 23`
# with dst ip 192.168.0.23 should be allowed
test_ip 13 f00000000013 f00000000023 $sip $tip 23
+sip=42420000000000000000000000000014
+tip=42420000000000000000000000000023
+# IPv6 packet from lsp13 with src ip 4242::14 destined to lsp23
+# with dst ip 4242::23 should be received by lsp23
+test_ipv6 13 f00000000013 f00000000223 $sip $tip 23
+
sip=`ip_to_hex 192 168 0 33`
tip=`ip_to_hex 10 0 0 15`
# IPv4 packet from lsp33 with src ip 192.168.0.33 destined to lsp13
# with dst ip 10.0.0.15 should be received by lsp13
test_ip 33 f00000000033 f00000000013 $sip $tip 13
+sip=42420000000000000000000000000033
+tip=42420000000000000000000000000013
+# IPv6 packet from lsp33 with src ip 4242::33 destined to lsp13
+# with dst ip 4242::13 should be received by lsp13
+test_ipv6 33 f00000000333 f00000000013 $sip $tip 13
+
sip=`ip_to_hex 192 168 0 33`
tip=`ip_to_hex 20 0 0 4`
# IPv4 packet from lsp33 with src ip 192.168.0.33 destined to lsp13
@@ -4437,6 +4453,12 @@ tip=`ip_to_hex 20 0 0 5`
# with dst ip 20.0.0.5 should not be received by lsp13
test_ip 33 f00000000033 f00000000013 $sip $tip
+sip=42420000000000000000000000000033
+tip=42420000000000000000000000000005
+# IPv6 packet from lsp33 with src ip 4242::33 destined to lsp13
+# with dst ip 4242::5 should not be received by lsp13
+test_ipv6 33 f00000000333 f00000000013 $sip $tip 13
+
sip=`ip_to_hex 192 168 0 33`
tip=`ip_to_hex 20 0 0 255`
# IPv4 packet from lsp33 with src ip 192.168.0.33 destined to lsp13
--
1.8.3.1