[ovs-dev] [RFC] ovn-northd: support IPAM with externally specified MAC
Lance Richardson
lrichard at redhat.com
Thu Sep 15 13:21:53 UTC 2016
The current IPAM implementation allocates both a MAC address and
an IPv4 address when dynamic address allocation is requested. This
patch adds the ability to specify a fixed MAC address for use with
dynamic IPv4 address allocation.
Example:
ovn-nbctl lsp-set-addresses p1 "00:01:02:03:04:05 dynamic"
Signed-off-by: Lance Richardson <lrichard at redhat.com>
---
ovn/lib/ovn-util.c | 38 ++++++++++++++++++++++++++++++++++++++
ovn/lib/ovn-util.h | 2 +-
ovn/northd/ovn-northd.c | 30 +++++++++++++++++++-----------
ovn/ovn-nb.xml | 35 ++++++++++++++++++++++++++++++++---
tests/ovn.at | 7 +++++++
5 files changed, 97 insertions(+), 15 deletions(-)
diff --git a/ovn/lib/ovn-util.c b/ovn/lib/ovn-util.c
index 5dbc138..a00e4c0 100644
--- a/ovn/lib/ovn-util.c
+++ b/ovn/lib/ovn-util.c
@@ -62,6 +62,44 @@ add_ipv6_netaddr(struct lport_addresses *laddrs, struct in6_addr addr,
inet_ntop(AF_INET6, &na->network, na->network_s, sizeof na->network_s);
}
+/* Returns true if specified address specifies a dynamic address,
+ * supporting the following formats:
+ *
+ * "dynamic":
+ * Both MAC and IP are to be allocated dynamically.
+ *
+ * "xx:xx:xx:xx:xx:xx dynamic":
+ * Use specified MAC address, but allocate an IP address
+ * dynamically.
+ */
+bool
+is_dynamic_lsp_address(const char *address)
+{
+ const char *buf = address;
+ struct eth_addr ea;
+ int buf_index = 0;
+
+ if (!strcmp(address, "dynamic")) {
+ return true;
+ }
+
+ if (!ovs_scan_len(buf, &buf_index, ETH_ADDR_SCAN_FMT,
+ ETH_ADDR_SCAN_ARGS(ea))) {
+ return false;
+ }
+
+ buf += buf_index;
+ while (isspace(*buf)) {
+ buf++;
+ }
+
+ if (!strcmp(buf, "dynamic")) {
+ return true;
+ }
+
+ return false;
+}
+
/* Extracts the mac, IPv4 and IPv6 addresses from * 'address' which
* should be of the format 'MAC [IP1 IP2 ..]" where IPn should be a
* valid IPv4 or IPv6 address and stores them in the 'ipv4_addrs' and
diff --git a/ovn/lib/ovn-util.h b/ovn/lib/ovn-util.h
index 2329111..30b27b1 100644
--- a/ovn/lib/ovn-util.h
+++ b/ovn/lib/ovn-util.h
@@ -53,7 +53,7 @@ struct lport_addresses {
struct ipv6_netaddr *ipv6_addrs;
};
-
+bool is_dynamic_lsp_address(const char *address);
bool extract_lsp_addresses(const char *address, struct lport_addresses *);
bool extract_lrp_networks(const struct nbrec_logical_router_port *,
struct lport_addresses *);
diff --git a/ovn/northd/ovn-northd.c b/ovn/northd/ovn-northd.c
index 62af64b..bf43fe4 100644
--- a/ovn/northd/ovn-northd.c
+++ b/ovn/northd/ovn-northd.c
@@ -732,7 +732,7 @@ ipam_insert_lsp_addresses(struct ovn_datapath *od, struct ovn_port *op,
char *address)
{
if (!od || !op || !address || !strcmp(address, "unknown")
- || !strcmp(address, "dynamic")) {
+ || is_dynamic_lsp_address(address)) {
return;
}
@@ -857,7 +857,7 @@ ipam_get_unused_ip(struct ovn_datapath *od, uint32_t subnet, uint32_t mask)
static bool
ipam_allocate_addresses(struct ovn_datapath *od, struct ovn_port *op,
- ovs_be32 subnet, ovs_be32 mask)
+ const char *addrspec, ovs_be32 subnet, ovs_be32 mask)
{
if (!od || !op || !op->nbsp) {
return false;
@@ -869,16 +869,23 @@ ipam_allocate_addresses(struct ovn_datapath *od, struct ovn_port *op,
}
struct eth_addr mac;
- uint64_t mac64 = ipam_get_unused_mac();
- if (!mac64) {
- return false;
+ bool check_mac;
+
+ if (eth_addr_from_string(addrspec, &mac)) {
+ check_mac = true;
+ } else {
+ uint64_t mac64 = ipam_get_unused_mac();
+ if (!mac64) {
+ return false;
+ }
+ eth_addr_from_uint64(mac64, &mac);
+ check_mac = false;
}
- eth_addr_from_uint64(mac64, &mac);
/* Add MAC/IP to MACAM/IPAM hmaps if both addresses were allocated
* successfully. */
ipam_insert_ip(od, ip, false);
- ipam_insert_mac(&mac, false);
+ ipam_insert_mac(&mac, check_mac);
char *new_addr = xasprintf(ETH_ADDR_FMT" "IP_FMT,
ETH_ADDR_ARGS(mac), IP_ARGS(htonl(ip)));
@@ -935,9 +942,10 @@ build_ipam(struct hmap *datapaths, struct hmap *ports)
}
for (size_t j = 0; j < nbsp->n_addresses; j++) {
- if (!strcmp(nbsp->addresses[j], "dynamic")
+ if (is_dynamic_lsp_address(nbsp->addresses[j])
&& !nbsp->dynamic_addresses) {
- if (!ipam_allocate_addresses(od, op, subnet, mask)
+ if (!ipam_allocate_addresses(od, op,
+ nbsp->addresses[j], subnet, mask)
|| !extract_lsp_addresses(nbsp->dynamic_addresses,
&op->lsp_addrs[op->n_lsp_addrs])) {
static struct vlog_rate_limit rl
@@ -1104,7 +1112,7 @@ join_logical_ports(struct northd_context *ctx,
if (!strcmp(nbsp->addresses[j], "unknown")) {
continue;
}
- if (!strcmp(nbsp->addresses[j], "dynamic")) {
+ if (is_dynamic_lsp_address(nbsp->addresses[j])) {
if (nbsp->dynamic_addresses) {
if (!extract_lsp_addresses(nbsp->dynamic_addresses,
&op->lsp_addrs[op->n_lsp_addrs])) {
@@ -2905,7 +2913,7 @@ build_lswitch_flows(struct hmap *datapaths, struct hmap *ports,
ovn_multicast_add(mcgroups, &mc_unknown, op);
op->od->has_unknown = true;
}
- } else if (!strcmp(op->nbsp->addresses[i], "dynamic")) {
+ } else if (is_dynamic_lsp_address(op->nbsp->addresses[i])) {
if (!op->nbsp->dynamic_addresses
|| !eth_addr_from_string(op->nbsp->dynamic_addresses,
&mac)) {
diff --git a/ovn/ovn-nb.xml b/ovn/ovn-nb.xml
index c45a444..78af2b3 100644
--- a/ovn/ovn-nb.xml
+++ b/ovn/ovn-nb.xml
@@ -474,6 +474,35 @@
column="other_config" key="subnet"/> in the port's <ref
table="Logical_Switch"/>.
</dd>
+
+ <dt><code>Ethernet address followed by keyword "dynamic"</code></dt>
+ <dd>
+
+ <p>
+ The keyword <code>dynamic</code> after the MAC address indicates
+ that <code>ovn-northd</code> should choose an unused IPv4 address
+ from the logical port's subnet and store it with the specified
+ MAC in the port's <ref column="dynamic_addresses"/> column.
+ <code>ovn-northd</code> will use the subnet specified in <ref
+ table="Logical_Switch" column="other_config" key="subnet"/> in
+ the port's <ref table="Logical_Switch"/> table.
+ </p>
+
+ <p>
+ Examples:
+ </p>
+
+ <dl>
+ <dt><code>80:fa:5b:06:72:b7 dynamic</code></dt>
+ <dd>
+ This indicates that the logical port owns the specified
+ MAC address and <code>ovn-northd</code> should allocate an
+ unused IPv4 address for the logical port from the corresponding
+ logical switch subnet.
+ </dd>
+ </dl>
+ </dd>
+
</dl>
</column>
@@ -482,9 +511,9 @@
Addresses assigned to the logical port by <code>ovn-northd</code>, if
<code>dynamic</code> is specified in <ref column="addresses"/>.
Addresses will be of the same format as those that populate the <ref
- column="addresses"/> column. Note that these addresses are
- constructed and managed locally in ovn-northd, so they cannot be
- reconstructed in the event that the database is lost.
+ column="addresses"/> column. Note that dynamically assigned
+ addresses are constructed and managed locally in ovn-northd, so they
+ cannot be reconstructed in the event that the database is lost.
</p>
</column>
diff --git a/tests/ovn.at b/tests/ovn.at
index 44c209e..4f7b787 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -4605,6 +4605,13 @@ AT_CHECK([ovn-nbctl get Logical-Switch-Port p30 dynamic_addresses], [0],
["0a:00:00:00:00:20 192.168.1.17"
])
+# Test static MAC address with dynamically allocated IP
+ovn-nbctl --wait=sb lsp-add sw0 p31 -- lsp-set-addresses p31 \
+"fe:dc:ba:98:76:54 dynamic"
+AT_CHECK([ovn-nbctl get Logical-Switch-Port p31 dynamic_addresses], [0],
+ ["fe:dc:ba:98:76:54 192.168.1.18"
+])
+
as ovn-sb
OVS_APP_EXIT_AND_WAIT([ovsdb-server])
--
2.5.5
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