rtnetlink: Extend rtnetlink to support RTNLGRP_IPV4_IFADDR and

RTNLGRP_IPV6_IFADDR.

This commit renames the rtnetlink-link.{c,h} to rtnetlink.{c,h}
and extends the module to support RTNLGRP_IPV4_IFADDR and
RTNLGRP_IPV4_IFADDR multicast groups.  A later patch will start
using this module to react to interface address changes.

Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/lib/rtnetlink.h b/lib/rtnetlink.h
new file mode 100644
index 000000000..f2da394cd
--- /dev/null
+++ b/lib/rtnetlink.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2009, 2015 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RTNETLINK_LINK_H
+#define RTNETLINK_LINK_H 1
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <linux/if_ether.h>
+
+struct ofpbuf;
+struct nln_notifier;
+
+/* These functions are Linux specific, so they should be used directly only by
+ * Linux-specific code. */
+
+/* A digested version of an rtnetlink_link message sent down by the kernel to
+ * indicate that a network device's status (link or address) has been changed.
+ */
+struct rtnetlink_change {
+    /* Copied from struct nlmsghdr. */
+    int nlmsg_type;             /* e.g. RTM_NEWLINK, RTM_DELLINK. */
+
+    /* Common attributes. */
+    int if_index;               /* Index of network device. */
+    const char *ifname;         /* Name of network device. */
+
+    /* Network device link status. */
+    int master_ifindex;         /* Ifindex of datapath master (0 if none). */
+    int mtu;                    /* Current MTU. */
+    uint8_t addr[ETH_ALEN];
+    unsigned int ifi_flags;     /* Flags of network device. */
+
+    /* Network device address status. */
+    /* xxx To be added when needed. */
+};
+
+/* Function called to report that a netdev has changed.  'change' describes the
+ * specific change.  It may be null if the buffer of change information
+ * overflowed, in which case the function must assume that every device may
+ * have changed.  'aux' is as specified in the call to
+ * rtnetlink_notifier_register().  */
+typedef
+void rtnetlink_notify_func(const struct rtnetlink_change *change,
+                           void *aux);
+
+bool rtnetlink_type_is_rtnlgrp_link(uint16_t type);
+bool rtnetlink_type_is_rtnlgrp_addr(uint16_t type);
+bool rtnetlink_parse(struct ofpbuf *buf, struct rtnetlink_change *change);
+struct nln_notifier *
+rtnetlink_notifier_create(rtnetlink_notify_func *, void *aux);
+void rtnetlink_notifier_destroy(struct nln_notifier *);
+void rtnetlink_run(void);
+void rtnetlink_wait(void);
+#endif /* rtnetlink.h */