From 467d776b150844849c3b6872dc0215e4ea04130c Mon Sep 17 00:00:00 2001
From: Archana Shinde <archana.m.shinde@intel.com>
Date: Mon, 10 Oct 2016 22:37:10 +0000
Subject: [PATCH] Add ability to change interface name while setting up an
 interface.

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>
---
 src/net.c   | 43 +++++++++++++++++++++++++++++++++++++++++++
 src/net.h   |  1 +
 src/parse.c |  4 ++++
 3 files changed, 48 insertions(+)

diff --git a/src/net.c b/src/net.c
index d255fb7..dd90dba 100644
--- a/src/net.c
+++ b/src/net.c
@@ -567,6 +567,44 @@ static int hyper_cleanup_route(struct rtnl_handle *rth, struct hyper_route *rt)
 	return 0;
 }
 
+static int hyper_set_interface_name(struct rtnl_handle *rth,
+				int ifindex,
+				char *new_device_name)
+{
+	struct {
+                struct nlmsghdr n;
+                struct ifinfomsg i;
+                char buf[1024];
+        } req;
+
+	if (ifindex < 0 || !new_device_name) {
+		return -1;
+	}
+
+	memset(&req, 0, sizeof(req));
+	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	req.n.nlmsg_flags = NLM_F_REQUEST;
+	req.n.nlmsg_type = RTM_SETLINK;
+
+	req.i.ifi_family = AF_UNSPEC;
+	req.i.ifi_change = 0xFFFFFFFF;
+	req.i.ifi_index = ifindex;
+
+	if (addattr_l(&req.n, sizeof(req), IFLA_IFNAME, 
+			new_device_name,
+			strlen(new_device_name) + 1)) {
+                fprintf(stderr, "setup attr failed\n");
+                return -1;
+        }
+
+	if (rtnl_talk(rth, &req.n, 0, 0, NULL) < 0) {
+		perror("rtnl_talk failed");
+		return -1;
+	}
+
+	return 0;
+}
+
 static int hyper_setup_interface(struct rtnl_handle *rth,
 			       struct hyper_interface *iface)
 {
@@ -621,6 +659,11 @@ static int hyper_setup_interface(struct rtnl_handle *rth,
 		return -1;
 	}
 
+	if (iface->new_device_name && strcmp(iface->new_device_name, iface->device)) {
+		fprintf(stdout, "Setting interface name to %s\n", iface->new_device_name);
+		hyper_set_interface_name(rth, ifindex, iface->new_device_name);
+	}
+
 	if (hyper_up_nic(rth, ifindex) < 0) {
 		fprintf(stderr, "up device %d failed\n", ifindex);
 		return -1;
diff --git a/src/net.h b/src/net.h
index 43524b2..8ebdd36 100644
--- a/src/net.h
+++ b/src/net.h
@@ -30,6 +30,7 @@ struct hyper_interface {
 	char		*device;
 	char		*ipaddr;
 	char		*mask;
+	char            *new_device_name;
 };
 
 struct hyper_route {
diff --git a/src/parse.c b/src/parse.c
index 4fb73a2..54f9f3b 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -773,6 +773,9 @@ static int hyper_parse_interface(struct hyper_interface *iface,
 		} else if (json_token_streq(json, &toks[i], "netMask")) {
 			iface->mask = (json_token_str(json, &toks[++i]));
 			fprintf(stdout, "net mask is %s\n", iface->mask);
+		} else if (json_token_streq(json, &toks[i], "newDeviceName")) {
+			iface->new_device_name = (json_token_str(json, &toks[++i]));
+			fprintf(stdout, "new interface name is %s\n", iface->new_device_name);
 		} else {
 			fprintf(stderr, "get unknown section %s in interfaces\n",
 				json_token_str(json, &toks[i]));
@@ -786,6 +789,7 @@ fail:
 	free(iface->device);
 	free(iface->ipaddr);
 	free(iface->mask);
+	free(iface->new_device_name);
 	return -1;
 }