netdev - [PATCH 5/5] Phonet: forward incoming packets

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Date:	Tue, 15 Sep 2009 14:32:23 +0300
From:	Rémi Denis-Courmont <remi@...lab.net>
To:	netdev@...r.kernel.org
Cc:	Rémi Denis-Courmont 
	<remi.denis-courmont@...ia.com>
Subject: [PATCH 5/5] Phonet: forward incoming packets

From: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>

From: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
---
 net/phonet/af_phonet.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index f0ef6f8..e69c915 100644
--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -394,8 +394,40 @@ static int phonet_rcv(struct sk_buff *skb, struct net_device *dev,
 			send_obj_unreachable(skb);
 			send_reset_indications(skb);
 		}
+	} else if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
+		goto out; /* Race between address deletion and loopback */
+	else {
+		/* Phonet packet routing */
+		struct net_device *out_dev;
+
+		out_dev = phonet_route_output(net, pn_sockaddr_get_addr(&sa));
+		if (!out_dev) {
+			LIMIT_NETDEBUG(KERN_WARNING"No Phonet route to %02X\n",
+					pn_sockaddr_get_addr(&sa));
+			goto out;
+		}
+
+		__skb_push(skb, sizeof(struct phonethdr));
+		skb->dev = out_dev;
+		if (out_dev == dev) {
+			LIMIT_NETDEBUG(KERN_ERR"Phonet loop to %02X on %s\n",
+					pn_sockaddr_get_addr(&sa), dev->name);
+			goto out_dev;
+		}
+		/* Some drivers (e.g. TUN) do not allocate HW header space */
+		if (skb_cow_head(skb, out_dev->hard_header_len))
+			goto out_dev;
+
+		if (dev_hard_header(skb, out_dev, ETH_P_PHONET, NULL, NULL,
+					skb->len) < 0)
+			goto out_dev;
+		dev_queue_xmit(skb);
+		dev_put(out_dev);
+		return NET_RX_SUCCESS;
 	}
 
+out_dev:
+	dev_put(skb->dev);
 out:
 	kfree_skb(skb);
 	return NET_RX_DROP;
-- 
1.6.0.4

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