netdev - [PATCH net-next 09/10] mctp: Set route MTU via netlink

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Date:   Wed, 29 Sep 2021 15:26:13 +0800
From:   Matt Johnston <matt@...econstruct.com.au>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     Jeremy Kerr <jk@...econstruct.com.au>
Subject: [PATCH net-next 09/10] mctp: Set route MTU via netlink

A route's RTAX_MTU can be set in nested RTAX_METRICS

Signed-off-by: Matt Johnston <matt@...econstruct.com.au>
---
 net/mctp/route.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/net/mctp/route.c b/net/mctp/route.c
index acc5bb39e16d..e20f3096d067 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -1026,10 +1026,15 @@ static int mctp_route_nlparse(struct sk_buff *skb, struct nlmsghdr *nlh,
 	return 0;
 }
 
+static const struct nla_policy rta_metrics_policy[RTAX_MAX + 1] = {
+	[RTAX_MTU]		= { .type = NLA_U32 },
+};
+
 static int mctp_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
 			 struct netlink_ext_ack *extack)
 {
 	struct nlattr *tb[RTA_MAX + 1];
+	struct nlattr *tbx[RTAX_MAX + 1];
 	mctp_eid_t daddr_start;
 	struct mctp_dev *mdev;
 	struct rtmsg *rtm;
@@ -1046,8 +1051,15 @@ static int mctp_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
 		return -EINVAL;
 	}
 
-	/* TODO: parse mtu from nlparse */
 	mtu = 0;
+	if (tb[RTA_METRICS]) {
+		rc = nla_parse_nested(tbx, RTAX_MAX, tb[RTA_METRICS],
+				      rta_metrics_policy, NULL);
+		if (rc < 0)
+			return rc;
+		if (tbx[RTAX_MTU])
+			mtu = nla_get_u32(tbx[RTAX_MTU]);
+	}
 
 	if (rtm->rtm_type != RTN_UNICAST)
 		return -EINVAL;
-- 
2.30.2