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[net-next,v3,13/16] mctp: Add dest neighbour lladdr to route output

Message ID 20210723082932.3570396-14-jk@codeconstruct.com.au
State Superseded
Headers show
Series Add Management Component Transport Protocol support | expand

Commit Message

Jeremy Kerr July 23, 2021, 8:29 a.m. UTC 
From: Matt Johnston <matt@codeconstruct.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@codeconstruct.com.au>
---
 net/mctp/route.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
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Patch

diff --git a/net/mctp/route.c b/net/mctp/route.c
index b961f43b5fbd..b5b3e991046a 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -375,6 +375,9 @@  static unsigned int mctp_route_mtu(struct mctp_route *rt)
 
 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;
 
@@ -386,9 +389,12 @@  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;