netdev - [PATCH RFC net-next v2 12/16] mctp: Add dest neighbour lladdr to route output

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Message-Id: <20210713062023.3286895-13-jk@codeconstruct.com.au>
Date:   Tue, 13 Jul 2021 14:20:19 +0800
From:   Jeremy Kerr <jk@...econstruct.com.au>
To:     netdev@...r.kernel.org
Cc:     Matt Johnston <matt@...econstruct.com.au>,
        Andrew Jeffery <andrew@...id.au>
Subject: [PATCH RFC net-next v2 12/16] mctp: Add dest neighbour lladdr to route output

From: Matt Johnston <matt@...econstruct.com.au>

Now that we have a neighbour implementation, hook it up to the output
path to set the dest hardware address for outgoing packets.

Signed-off-by: Matt Johnston <matt@...econstruct.com.au>
---
 net/mctp/route.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/mctp/route.c b/net/mctp/route.c
index 1909437f9a15..cf06d88ca0ca 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -169,6 +169,9 @@ static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
 
 static int mctp_route_output(struct mctp_route *route, struct sk_buff *skb)
 {
+	struct mctp_hdr *hdr = mctp_hdr(skb);
+	char daddr_buf[MAX_ADDR_LEN];
+	char *daddr = NULL;
 	unsigned int mtu;
 	int rc;
 
@@ -180,9 +183,12 @@ static int mctp_route_output(struct mctp_route *route, struct sk_buff *skb)
 		return -EMSGSIZE;
 	}
 
-	/* TODO: daddr (from rt->neigh), saddr (from device?)  */
+	/* If lookup fails let the device handle daddr==NULL */
+	if (mctp_neigh_lookup(route->dev, hdr->dest, daddr_buf) == 0)
+		daddr = daddr_buf;
+
 	rc = dev_hard_header(skb, skb->dev, ntohs(skb->protocol),
-			     NULL, NULL, skb->len);
+			     daddr, skb->dev->dev_addr, skb->len);
 	if (rc) {
 		kfree_skb(skb);
 		return -EHOSTUNREACH;
-- 
2.30.2