[ovs-dev] [PATCH ovn v5] ovn-northd.c: Add proxy ARP support to OVN
Brendan Doyle
brendan.doyle at oracle.com
Tue Jun 29 11:47:32 UTC 2021
Numan,
Did this version apply ? I'm guessing not. This was generated with git
mail. But I don't see
an entry in https://patchwork.ozlabs.org/project/ovn/list/
for it. Please let me know if this has issue, if so I'll try generate a PR.
Thanks
Brendan
On 28/06/2021 12:16, Brendan Doyle wrote:
> This patch provides the ability to configure proxy ARP IPs on a Logical
> Switch Router port. The IPs are added as Options for router ports. This
> provides a useful feature where traffic for a service must be sent to an
> address in a logical network address space, but the service is provided
> in a different network. For example an NFS service is provide to Logical
> networks at an address in their Logical network space, but the NFS
> server resides in a physical network. A Logical switch Router port can
> be configured to respond to ARP requests sent to the service "Logical
> address", the Logical Router/Gateway can then be configured to forward
> the traffic to the underlay/physical network.
>
> Signed-off-by: Brendan Doyle <brendan.doyle at oracle.com>
> ---
> northd/ovn-northd.c | 48 ++++++++++++++++++++++++
> ovn-nb.xml | 9 +++++
> tests/ovn.at | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 160 insertions(+)
>
> diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
> index fcd6167..258b5db 100644
> --- a/northd/ovn-northd.c
> +++ b/northd/ovn-northd.c
> @@ -6969,6 +6969,8 @@ build_lswitch_arp_nd_responder_known_ips(struct ovn_port *op,
> struct ds *match)
> {
> if (op->nbsp) {
> + const char *arp_proxy;
> +
> if (!strcmp(op->nbsp->type, "virtual")) {
> /* Handle
> * - GARPs for virtual ip which belongs to a logical port
> @@ -7126,6 +7128,52 @@ build_lswitch_arp_nd_responder_known_ips(struct ovn_port *op,
> }
> }
> }
> +
> + /*
> + * Add responses for ARP proxies.
> + */
> + arp_proxy = smap_get(&op->nbsp->options,"arp_proxy");
> +
> + if (arp_proxy && op->peer) {
> + struct lport_addresses proxy_arp_addrs;
> + int i = 0;
> +
> + if (extract_ip_addresses(arp_proxy, &proxy_arp_addrs)) {
> + /*
> + * Match rule on all proxy ARP IPs.
> + */
> + ds_clear(match);
> + ds_put_cstr(match, "arp.op == 1 && (");
> +
> + for (i = 0; i < proxy_arp_addrs.n_ipv4_addrs; i++) {
> + if (i > 0) {
> + ds_put_cstr(match, " || ");
> + }
> + ds_put_format(match, "arp.tpa == %s",
> + proxy_arp_addrs.ipv4_addrs[i].addr_s);
> + }
> +
> + ds_put_cstr(match, ")");
> + destroy_lport_addresses(&proxy_arp_addrs);
> +
> + ds_clear(actions);
> + ds_put_format(actions,
> + "eth.dst = eth.src; "
> + "eth.src = %s; "
> + "arp.op = 2; /* ARP reply */ "
> + "arp.tha = arp.sha; "
> + "arp.sha = %s; "
> + "arp.tpa <-> arp.spa; "
> + "outport = inport; "
> + "flags.loopback = 1; "
> + "output;",
> + op->peer->lrp_networks.ea_s,
> + op->peer->lrp_networks.ea_s);
> +
> + ovn_lflow_add_with_hint(lflows, op->od, S_SWITCH_IN_ARP_ND_RSP,
> + 50, ds_cstr(match), ds_cstr(actions), &op->nbsp->header_);
> + }
> + }
> }
> }
>
> diff --git a/ovn-nb.xml b/ovn-nb.xml
> index 406bc85..077a2d8 100644
> --- a/ovn-nb.xml
> +++ b/ovn-nb.xml
> @@ -848,6 +848,15 @@
> </dd>
> </dl>
> </column>
> +
> + <column name="options" key="arp_proxy">
> + Optional. A list IPv4 addresses that this
> + logical switch <code>router</code> port will reply to ARP requests.
> + Example: <code>169.254.239.254 169.254.239.2</code>. The
> + <ref column="options" key="router-port"/>'s logical router should
> + have a route to forward packets sent to configured proxy ARP IPs to
> + an appropriate destination.
> + </column>
> </group>
>
> <group title="Options for localnet ports">
> diff --git a/tests/ovn.at b/tests/ovn.at
> index 5926350..1e0065d 100644
> --- a/tests/ovn.at
> +++ b/tests/ovn.at
> @@ -26899,3 +26899,106 @@ AT_CHECK([ovs-ofctl dump-flows br-int "nw_src=10.0.0.0/24" | \
> OVN_CLEANUP([hv1])
> AT_CLEANUP
> ])
> +
> +OVN_FOR_EACH_NORTHD([
> +AT_SETUP([ovn -- proxy-arp: 1 HVs, 1 LSs, 1 lport/LS, 1 LR])
> +AT_KEYWORDS([proxy-arp])
> +ovn_start
> +
> +# Logical network:
> +# One LR - lr1 has switch ls1 (192.16.1.0/24) connected to it,
> +# and and one HV with IP 192.16.1.6.
> +
> +ovn-nbctl lr-add lr1
> +ovn-nbctl ls-add ls1
> +
> +# Connect ls1 to lr1
> +ovn-nbctl lrp-add lr1 ls1 00:00:00:01:02:f1 192.16.1.1/24
> +ovn-nbctl lsp-add ls1 rp-ls1 -- set Logical_Switch_Port rp-ls1 \
> + type=router options:router-port=ls1 addresses=\"00:00:00:01:02:f1\"
> +
> +# Create logical port ls1-lp1 in ls1
> +ovn-nbctl lsp-add ls1 ls1-lp1 \
> +-- lsp-set-addresses ls1-lp1 "00:00:00:01:02:03 192.16.1.6"
> +
> +
> +# Create one hypervisor and create OVS ports corresponding to logical ports.
> +net_add n1
> +
> +sim_add pa-hv
> +as pa-hv
> +ovs-vsctl add-br br-phys
> +ovn_attach n1 br-phys 192.16.0.1
> +
> +# Note: tx/rx are with respect to the LS port, so
> +# tx on switch port is HV rx, etc.
> +ovs-vsctl -- add-port br-int vif1 -- \
> + set interface vif1 external-ids:iface-id=ls1-lp1 \
> + options:tx_pcap=pa-hv/vif1-tx.pcap \
> + options:rxq_pcap=pa-hv/vif1-rx.pcap \
> + ofport-request=1
> +
> +# And proxy ARP flows for 69.254.239.254 and 169.254.239.2
> +# and check that SB flows have been added.
> +ovn-nbctl --wait=hv add Logical_Switch_Port rp-ls1 \
> +options arp_proxy='"169.254.239.254 169.254.239.2"'
> +ovn-sbctl dump-flows > sbflows
> +AT_CAPTURE_FILE([sbflows])
> +
> +AT_CHECK([ovn-sbctl dump-flows | grep ls_in_arp_rsp | grep "169.254.239.2" | wc -l], [0], [dnl
> +1
> +])
> +
> +# Remove and check that the flows have been removed
> +ovn-nbctl --wait=hv remove Logical_Switch_Port rp-ls1 options arp_proxy='"169.254.239.254 169.254.239.2"'
> +
> +AT_CHECK([ovn-sbctl dump-flows | grep ls_in_arp_rsp | grep "169.254.239.2" | wc -l], [0], [dnl
> +0
> +])
> +
> +# Add the flows back send arp request and check we see an ARP response
> +ovn-nbctl --wait=hv add Logical_Switch_Port rp-ls1 \
> +options arp_proxy='"169.254.239.254 169.254.239.2"'
> +
> +ls1_p1_mac=00:00:00:01:02:03
> +ls1_p1_ip=192.16.1.6
> +
> +ls1_ro_mac=00:00:00:01:02:f1
> +ls1_ro_ip=192.168.1.1
> +
> +proxy_ip1=169.254.239.254
> +proxy_ip2=169.254.239.2
> +
> +bcast_mac=ff:ff:ff:ff:ff:ff
> +
> +# Send ARP request for 169.254.239.254
> +packet="inport==\"ls1-lp1\" && eth.src==$ls1_p1_mac && eth.dst==$bcast_mac &&
> + arp.op==1 && arp.sha==$ls1_p1_mac && arp.spa==$ls1_p1_ip &&
> + arp.tha==$bcast_mac && arp.tpa==$proxy_ip1"
> +
> +as pa-hv ovs-appctl -t ovn-controller inject-pkt "$packet"
> +
> +ovs-ofctl dump-flows br-int| grep 169.254.239.254 | grep priority=50 > debug1
> +AT_CAPTURE_FILE([debug1])
> +
> +
> +# Check if packet hit the ARP reply ovs flow
> +AT_CHECK([ovs-ofctl dump-flows br-int | \
> + grep "169.254.239.254" | \
> + grep "priority=50" | \
> + grep "arp_op=1" | \
> + grep "n_packets=1" | wc -l], [0], [dnl
> +1
> +])
> +
> +# Check that the HV gets an ARP reply
> +expected="eth.src==$ls1_ro_mac && eth.dst==$ls1_p1_mac &&
> + arp.op==2 && arp.sha==$ls1_ro_mac && arp.spa==$proxy_ip1 &&
> + arp.tha==$ls1_p1_mac && arp.tpa==$ls1_p1_ip"
> +echo $expected | ovstest test-ovn expr-to-packets > expected
> +
> +OVN_CHECK_PACKETS([pa-hv/vif1-tx.pcap], [expected])
> +
> +OVN_CLEANUP([pa-hv])
> +AT_CLEANUP
> +])
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