mctp: Set route MTU via netlink

A route's RTAX_MTU can be set in nested RTAX_METRICS

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mctp/route.c b/net/mctp/route.c
index acc5bb39e16db20c76f190dd044177f85c9aba2a..e20f3096d0672389b2cfd00dd19c8495bb671101 100644 (file)
--- 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;