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X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: William Tu via dev From: William Tu Reply-To: William Tu Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" Add route-table support for ipv4 dst via ipv6. One use case is BGP unnumbered, a mechanism that establishes peering sessions without the need to explicitly configure IPv4 addresses on the interfaces involved in the peering. Without using IPv4 address assignments, it uses link-local IPv6 addresses of the directly connected neighbors for peering purposes. For example, BGP might install the following route: $ ip route get 100.87.18.3 100.87.18.3 via inet6 fe80::920a:84ff:fe9e:9570 \ dev br-phy src 100.87.18.6 Note that the v6 addr fe80::920a:84ff:fe9e:9570 is not being used in the packet header, but only used for lookup the out dev br-phy. Currently OVS can only support either all-ipv4 or all-ipv6, the patch adds support for such use case. Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2024-January/052908.html Acked-by: Simon Horman Signed-off-by: William Tu --- v5: fix minor CI failure v4: feedback from Ilya - add route del test case, wrap around test width - not set neighbor cache manually - on br-phy, use /32 on address in steead of /24 compare v3 and v4 https://github.com/williamtu/ovs/compare/router..router-v4 v3: add vxlan test, remove rfc v2: fix CI error --- lib/ovs-router.c | 39 +++++++++++----------- lib/route-table.c | 21 ++++++++++++ ofproto/ofproto-dpif-xlate.c | 3 +- tests/ovs-router.at | 51 +++++++++++++++++++++++++++++ tests/system-route.at | 39 ++++++++++++++++++++++ tests/tunnel-push-pop.at | 63 ++++++++++++++++++++++++++++++++++++ 6 files changed, 197 insertions(+), 19 deletions(-) diff --git a/lib/ovs-router.c b/lib/ovs-router.c index 3d84c9a30a8f..fbf67b666993 100644 --- a/lib/ovs-router.c +++ b/lib/ovs-router.c @@ -184,6 +184,11 @@ verify_prefsrc(const struct in6_addr *ip6_dst, goto out; } + /* Skip the check if not the same address family */ + if (!IN6_IS_ADDR_V4MAPPED(ip6_dst) && IN6_IS_ADDR_V4MAPPED(prefsrc)) { + goto out; + } + for (i = 0; i < n_in6; i++) { struct in6_addr a1, a2; a1 = ipv6_addr_bitand(ip6_dst, &mask[i]); @@ -415,7 +420,6 @@ ovs_router_add(struct unixctl_conn *conn, int argc, unsigned int plen; ovs_be32 src = 0; ovs_be32 gw = 0; - bool is_ipv6; ovs_be32 ip; int err; int i; @@ -423,9 +427,8 @@ ovs_router_add(struct unixctl_conn *conn, int argc, if (scan_ipv4_route(argv[1], &ip, &plen)) { in6_addr_set_mapped_ipv4(&ip6, ip); plen += 96; - is_ipv6 = false; } else if (scan_ipv6_route(argv[1], &ip6, &plen)) { - is_ipv6 = true; + ; } else { unixctl_command_reply_error(conn, "Invalid 'ip/plen' parameter"); @@ -438,21 +441,21 @@ ovs_router_add(struct unixctl_conn *conn, int argc, continue; } - if (is_ipv6) { - if (ovs_scan(argv[i], "src="IPV6_SCAN_FMT, src6_s) && - ipv6_parse(src6_s, &src6)) { - continue; - } - if (ipv6_parse(argv[i], &gw6)) { - continue; - } - } else { - if (ovs_scan(argv[i], "src="IP_SCAN_FMT, IP_SCAN_ARGS(&src))) { - continue; - } - if (ip_parse(argv[i], &gw)) { - continue; - } + if (ovs_scan(argv[i], "src="IPV6_SCAN_FMT, src6_s) && + ipv6_parse(src6_s, &src6)) { + continue; + } + + if (ipv6_parse(argv[i], &gw6)) { + continue; + } + + if (ovs_scan(argv[i], "src="IP_SCAN_FMT, IP_SCAN_ARGS(&src))) { + continue; + } + + if (ip_parse(argv[i], &gw)) { + continue; } unixctl_command_reply_error(conn, diff --git a/lib/route-table.c b/lib/route-table.c index f1fe32714e8d..58412711888f 100644 --- a/lib/route-table.c +++ b/lib/route-table.c @@ -232,6 +232,7 @@ route_table_parse(struct ofpbuf *buf, struct route_table_msg *change) [RTA_OIF] = { .type = NL_A_U32, .optional = true }, [RTA_GATEWAY] = { .type = NL_A_U32, .optional = true }, [RTA_MARK] = { .type = NL_A_U32, .optional = true }, + [RTA_VIA] = { .type = NL_A_UNSPEC, .optional = true }, [RTA_PREFSRC] = { .type = NL_A_U32, .optional = true }, [RTA_TABLE] = { .type = NL_A_U32, .optional = true }, }; @@ -241,6 +242,7 @@ route_table_parse(struct ofpbuf *buf, struct route_table_msg *change) [RTA_OIF] = { .type = NL_A_U32, .optional = true }, [RTA_MARK] = { .type = NL_A_U32, .optional = true }, [RTA_GATEWAY] = { .type = NL_A_IPV6, .optional = true }, + [RTA_VIA] = { .type = NL_A_UNSPEC, .optional = true }, [RTA_PREFSRC] = { .type = NL_A_IPV6, .optional = true }, [RTA_TABLE] = { .type = NL_A_U32, .optional = true }, }; @@ -333,6 +335,25 @@ route_table_parse(struct ofpbuf *buf, struct route_table_msg *change) nl_attr_get_in6_addr(attrs[RTA_PREFSRC]); } } + if (attrs[RTA_VIA]) { + const struct rtvia *via; + ovs_be32 gw; + + via = nl_attr_get(attrs[RTA_VIA]); + switch (via->rtvia_family) { + case AF_INET: + gw = *(ALIGNED_CAST(ovs_be32 *, via->rtvia_addr)); + in6_addr_set_mapped_ipv4(&change->rd.rta_gw, gw); + break; + case AF_INET6: + change->rd.rta_gw = *(ALIGNED_CAST(struct in6_addr *, + via->rtvia_addr)); + break; + default: + VLOG_WARN("Unknown address family %d\n", via->rtvia_family); + return 0; + } + } if (attrs[RTA_GATEWAY]) { if (ipv4) { ovs_be32 gw; diff --git a/ofproto/ofproto-dpif-xlate.c b/ofproto/ofproto-dpif-xlate.c index 7c495089509f..3694a8430382 100644 --- a/ofproto/ofproto-dpif-xlate.c +++ b/ofproto/ofproto-dpif-xlate.c @@ -3612,7 +3612,8 @@ tnl_route_lookup_flow(const struct xlate_ctx *ctx, } if (ipv6_addr_is_set(&gw) && - (!IN6_IS_ADDR_V4MAPPED(&gw) || in6_addr_get_mapped_ipv4(&gw))) { + (!IN6_IS_ADDR_V4MAPPED(&gw) || in6_addr_get_mapped_ipv4(&gw)) && + (!IN6_IS_ADDR_V4MAPPED(&dst) || IN6_IS_ADDR_V4MAPPED(&gw))) { *ip = gw; } else { *ip = dst; diff --git a/tests/ovs-router.at b/tests/ovs-router.at index b3314b3dff0d..5e5e1d013464 100644 --- a/tests/ovs-router.at +++ b/tests/ovs-router.at @@ -109,6 +109,57 @@ User: 2001:db8:beef::14/128 MARK 14 dev br0 GW 2001:db8:cafe::1 SRC 2001:db8:caf OVS_VSWITCHD_STOP AT_CLEANUP +AT_SETUP([appctl - route/add and del with ipv4 via ipv6]) +AT_KEYWORDS([ovs_router]) +OVS_VSWITCHD_START([add-port br0 p1 -- set Interface p1 type=dummy]) +AT_CHECK([ovs-appctl netdev-dummy/ip4addr br0 192.168.9.2/24], [0], [OK +]) +AT_CHECK([ovs-appctl netdev-dummy/ip4addr br0 192.168.9.3/24], [0], [OK +]) + +dnl defualt pick the first IP, 192.168.9.2, as src +AT_CHECK([ovs-appctl ovs/route/add 192.168.9.10/32 br0 dnl +fe80::920a:84ff:beef:9510], [0], [OK +]) +AT_CHECK([ovs-appctl ovs/route/add 192.168.9.11/32 br0 dnl +fe80::920a:84ff:beef:9511 src=192.168.9.2], [0], [OK +]) +AT_CHECK([ovs-appctl ovs/route/add 192.168.9.12/32 br0 dnl +fe80::920a:84ff:beef:9512 src=192.168.9.3], [0], [OK +]) +AT_CHECK([ovs-appctl ovs/route/add 192.168.9.13/32 br0 dnl +fe80::920a:84ff:beef:9513 pkt_mark=13 src=192.168.9.3], [0], [OK +]) + +AT_CHECK([ovs-appctl ovs/route/show | grep User | grep beef | sort], [0], [dnl +User: 192.168.9.10/32 dev br0 GW fe80::920a:84ff:beef:9510 SRC 192.168.9.2 +User: 192.168.9.11/32 dev br0 GW fe80::920a:84ff:beef:9511 SRC 192.168.9.2 +User: 192.168.9.12/32 dev br0 GW fe80::920a:84ff:beef:9512 SRC 192.168.9.3 +User: 192.168.9.13/32 MARK 13 dev br0 GW fe80::920a:84ff:beef:9513 SRC 192.168.9.3 +]) + +dnl DST and SRC can be in different domain +AT_CHECK([ovs-appctl ovs/route/add 192.168.10.12/32 br0 dnl +fe80::920a:84ff:face:9512 src=192.168.9.3], [0], [OK +]) +AT_CHECK([ovs-appctl ovs/route/show | grep User | grep face | sort], [0], [dnl +User: 192.168.10.12/32 dev br0 GW fe80::920a:84ff:face:9512 SRC 192.168.9.3 +]) + +dnl Delete route +AT_CHECK([ovs-appctl ovs/route/del 192.168.9.10/32], [0], [OK +]) +AT_CHECK([ovs-appctl ovs/route/del 192.168.9.11/32], [0], [OK +]) +AT_CHECK([ovs-appctl ovs/route/del 192.168.9.12/32], [0], [OK +]) +AT_CHECK([ovs-appctl ovs/route/del 192.168.9.13/32 pkt_mark=13], [0], [OK +]) +OVS_WAIT_UNTIL([test $(ovs-appctl ovs/route/show | grep -c '192.168.9.1') -eq 0 ]) + +OVS_VSWITCHD_STOP +AT_CLEANUP + AT_SETUP([appctl - route/lookup]) AT_KEYWORDS([ovs_router]) OVS_VSWITCHD_START([add-port br0 p1 -- set Interface p1 type=dummy]) diff --git a/tests/system-route.at b/tests/system-route.at index c0ecad6cfb49..dbb2afa5a8fe 100644 --- a/tests/system-route.at +++ b/tests/system-route.at @@ -65,6 +65,45 @@ Cached: fc00:db8:beef::13/128 dev br0 GW fc00:db8:cafe::1 SRC fc00:db8:cafe::2]) OVS_TRAFFIC_VSWITCHD_STOP AT_CLEANUP +AT_SETUP([ovs-route - add and del system route ipv4 via ipv6]) +AT_KEYWORDS([route]) +OVS_TRAFFIC_VSWITCHD_START() +AT_CHECK([ip link set br0 up]) + +AT_CHECK([ip addr add 192.168.9.2/24 dev br0], [0], [stdout]) +AT_CHECK([ip addr add 192.168.9.3/24 dev br0], [0], [stdout]) + +AT_CHECK([ip -6 addr add fc00:db8:cafe::2/64 dev br0], [0], [stdout]) +AT_CHECK([ip -6 addr add fc00:db8:cafe::3/64 dev br0], [0], [stdout]) + +AT_CHECK([ip route add 192.168.9.12/32 dev br0 dnl +via inet6 fe80::920a:84ff:fe9e:9512 src 192.168.9.2], [0], [stdout]) +AT_CHECK([ip route add 192.168.9.13/32 dev br0 dnl +via inet6 fe80::920a:84ff:fe9e:9513 src 192.168.9.3], [0], [stdout]) + +OVS_WAIT_UNTIL_EQUAL([ovs-appctl ovs/route/show | grep -E '192.168.9.1[[23]]/32' | sort], [dnl +Cached: 192.168.9.12/32 dev br0 GW fe80::920a:84ff:fe9e:9512 SRC 192.168.9.2 +Cached: 192.168.9.13/32 dev br0 GW fe80::920a:84ff:fe9e:9513 SRC 192.168.9.3]) + +AT_CHECK([ovs-appctl ovs/route/add 192.168.9.14/32 br0 dnl +fe80::920a:84ff:fe9e:9514 src=192.168.9.2], [0], [OK +]) + +OVS_WAIT_UNTIL_EQUAL([ovs-appctl ovs/route/show | grep -E '192.168.9.14/32' | sort], [dnl +User: 192.168.9.14/32 dev br0 GW fe80::920a:84ff:fe9e:9514 SRC 192.168.9.2]) + +dnl Delete system cached route +AT_CHECK([ip route del 192.168.9.12/32 dev br0 dnl +via inet6 fe80::920a:84ff:fe9e:9512 src 192.168.9.2], [0], [stdout]) +AT_CHECK([ip route del 192.168.9.13/32 dev br0 dnl +via inet6 fe80::920a:84ff:fe9e:9513 src 192.168.9.3], [0], [stdout]) + +OVS_WAIT_UNTIL([test $(ovs-appctl ovs/route/show | grep -c '192.168.9.12/32') -eq 0 ]) +OVS_WAIT_UNTIL([test $(ovs-appctl ovs/route/show | grep -c '192.168.9.13/32') -eq 0 ]) + +OVS_TRAFFIC_VSWITCHD_STOP +AT_CLEANUP + dnl Checks that OVS doesn't use routes from non-standard tables. AT_SETUP([ovs-route - route tables]) AT_KEYWORDS([route]) diff --git a/tests/tunnel-push-pop.at b/tests/tunnel-push-pop.at index 508737c53ec6..7266f0990570 100644 --- a/tests/tunnel-push-pop.at +++ b/tests/tunnel-push-pop.at @@ -196,6 +196,69 @@ OVS_WAIT_UNTIL([test `ovs-pcap p0.pcap | grep 100022eb0000000120000237 | wc -l` OVS_VSWITCHD_STOP AT_CLEANUP +AT_SETUP([tunnel_push_pop - v4 via v6 route]) + +OVS_VSWITCHD_START([add-port br0 p0 -- set Interface p0 type=dummy ofport_request=1 other-config:hwaddr=aa:55:aa:55:00:00]) +AT_CHECK([ovs-vsctl add-br int-br -- set bridge int-br datapath_type=dummy], [0]) +AT_CHECK([ovs-vsctl add-port int-br t1 -- set Interface t1 type=vxlan \ + options:remote_ip=1.1.2.92 options:key=123 ofport_request=1\ + ], [0]) + +AT_CHECK([ovs-appctl dpif/show], [0], [dnl +dummy@ovs-dummy: hit:0 missed:0 + br0: + br0 65534/100: (dummy-internal) + p0 1/1: (dummy) + int-br: + int-br 65534/2: (dummy-internal) + t1 1/4789: (vxlan: key=123, remote_ip=1.1.2.92) +]) + +AT_CHECK([ovs-ofctl add-flow br0 action=normal]) + +dnl Setup dummy interface IP addresses. +AT_CHECK([ovs-appctl netdev-dummy/ip4addr br0 1.1.2.88/32], [0], [OK +]) +AT_CHECK([ovs-appctl netdev-dummy/ip6addr br0 2001:cafe::88/64], [0], [OK +]) +dnl Add a static v4 via v6 route +AT_CHECK([ovs-appctl ovs/route/add 1.1.2.92/32 br0 2001:cafe::10 src=1.1.2.89], [0], [OK +]) + +AT_CHECK([ovs-appctl ovs/route/show | grep br0 | sort], [0], [dnl +Cached: 1.1.2.88/32 dev br0 SRC 1.1.2.88 local +Cached: 2001:cafe::/64 dev br0 SRC 2001:cafe::88 local +User: 1.1.2.92/32 dev br0 GW 2001:cafe::10 SRC 1.1.2.89 +]) + +dnl Check ARP Snoop +AT_CHECK([ovs-appctl netdev-dummy/receive p0 'recirc_id(0),in_port(100),dnl +eth(src=f8:bc:12:44:34:b6,dst=ff:ff:ff:ff:ff:ff),eth_type(0x0806),dnl +arp(sip=1.1.2.92,tip=1.1.2.88,op=2,sha=f8:bc:12:44:34:b6,tha=00:00:00:00:00:00)']) + +ovs-appctl time/warp 1000 +ovs-appctl time/warp 1000 + +AT_CHECK([ovs-appctl tnl/neigh/show | tail -n+3 | sort], [0], [dnl +1.1.2.92 f8:bc:12:44:34:b6 br0 +]) + +dnl Check VXLAN tunnel push +AT_CHECK([ovs-ofctl add-flow int-br action=1]) +AT_CHECK([ovs-appctl ofproto/trace ovs-dummy 'in_port(2),dnl +eth(src=f8:bc:12:44:34:b6,dst=aa:55:aa:55:00:00),eth_type(0x0800),dnl +ipv4(src=1.1.3.88,dst=1.1.3.112,proto=47,tos=0,ttl=64,frag=no)'], [0], [stdout]) + +AT_CHECK([tail -1 stdout], [0], + [Datapath actions: tnl_push(tnl_port(4789),header(size=50,type=4,dnl +eth(dst=f8:bc:12:44:34:b6,src=aa:55:aa:55:00:00,dl_type=0x0800),dnl +ipv4(src=1.1.2.89,dst=1.1.2.92,proto=17,tos=0,ttl=64,frag=0x4000),dnl +udp(src=0,dst=4789,csum=0x0),vxlan(flags=0x8000000,vni=0x7b)),out_port(100)),1 +]) + +OVS_VSWITCHD_STOP +AT_CLEANUP + AT_SETUP([tunnel_push_pop - action]) OVS_VSWITCHD_START([add-port br0 p0 -- set Interface p0 type=dummy ofport_request=1 other-config:hwaddr=aa:55:aa:55:00:00])