From 2d6a28574b93875d8ca5577f447d886cc60c0b1a Mon Sep 17 00:00:00 2001
From: Dmitry Kozlov <xeb@mail.ru>
Date: Mon, 25 Sep 2017 17:51:44 +0300
Subject: libnetlink: added function iplink_set_mtu

---
 accel-pppd/libnetlink/iputils.c | 30 ++++++++++++++++++++++++++++++
 accel-pppd/libnetlink/iputils.h |  1 +
 2 files changed, 31 insertions(+)

diff --git a/accel-pppd/libnetlink/iputils.c b/accel-pppd/libnetlink/iputils.c
index 1052b609..601b8954 100644
--- a/accel-pppd/libnetlink/iputils.c
+++ b/accel-pppd/libnetlink/iputils.c
@@ -153,6 +153,36 @@ out:
 	return r;
 }
 
+int __export iplink_set_mtu(int ifindex, int mtu)
+{
+	struct iplink_req {
+		struct nlmsghdr n;
+		struct ifinfomsg i;
+		char buf[1024];
+	} req;
+	struct rtnl_handle *rth = net->rtnl_get();
+	int r;
+
+	if (!rth)
+		return -1;
+
+	memset(&req, 0, sizeof(req) - 1024);
+
+	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
+	req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+	req.n.nlmsg_type = RTM_SETLINK;
+	req.i.ifi_family = AF_UNSPEC;
+	req.i.ifi_index = ifindex;
+
+	addattr_l(&req.n, 1024, IFLA_MTU, &mtu, 4);
+
+	r = rtnl_talk(rth, &req.n, 0, 0, NULL, NULL, NULL, 0);
+
+	net->rtnl_put(rth);
+
+	return r;
+}
+
 int __export iplink_vlan_add(const char *ifname, int ifindex, int vid)
 {
 	struct iplink_req {
diff --git a/accel-pppd/libnetlink/iputils.h b/accel-pppd/libnetlink/iputils.h
index 301cfed1..9bdc93da 100644
--- a/accel-pppd/libnetlink/iputils.h
+++ b/accel-pppd/libnetlink/iputils.h
@@ -7,6 +7,7 @@ typedef int (*iplink_list_func)(int index, int flags, const char *name, int ifli
 
 int iplink_list(iplink_list_func func, void *arg);
 int iplink_get_stats(int ifindex, struct rtnl_link_stats *stats);
+int iplink_set_mtu(int ifindex, int mtu);
 
 int iplink_vlan_add(const char *ifname, int ifindex, int vid);
 int iplink_vlan_del(int ifindex);
-- 
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