patch-2.3.47 linux/net/bridge/br_input.c

• Lines: 114
• Date: Sun Feb 20 10:41:18 2000
• Orig file: v2.3.46/linux/net/bridge/br_input.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.46/linux/net/bridge/br_input.c linux/net/bridge/br_input.c
@@ -0,0 +1,113 @@
+/*
+ *	Handle incoming frames
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_input.c,v 1.1 2000/02/18 16:47:12 davem Exp $
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_bridge.h>
+#include "br_private.h"
+
+unsigned char bridge_ula[5] = { 0x01, 0x80, 0xc2, 0x00, 0x00 };
+
+static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
+{
+	if (br->dev.flags & IFF_UP) {
+		br->statistics.rx_packets++;
+		br->statistics.rx_bytes += skb->len;
+
+		skb->dev = &br->dev;
+		skb->pkt_type = PACKET_HOST;
+		skb->mac.raw = skb->data;
+		skb_pull(skb, skb->nh.raw - skb->data);
+		skb->protocol = eth_type_trans(skb, &br->dev);
+		netif_rx(skb);
+
+		return;
+	}
+
+	kfree_skb(skb);
+}
+
+static void __br_handle_frame(struct sk_buff *skb)
+{
+	struct net_bridge *br;
+	unsigned char *dest;
+	struct net_bridge_fdb_entry *dst;
+	struct net_bridge_port *p;
+
+	skb->nh.raw = skb->mac.raw;
+	dest = skb->mac.ethernet->h_dest;
+
+	p = skb->dev->br_port;
+	br = p->br;
+
+	if (p->state == BR_STATE_DISABLED ||
+	    skb->mac.ethernet->h_source[0] & 1)
+		goto freeandout;
+
+	if (!memcmp(dest, bridge_ula, 5) && !(dest[5] & 0xF0))
+		goto handle_special_frame;
+
+	skb_push(skb, skb->data - skb->mac.raw);
+
+	if (p->state == BR_STATE_LEARNING ||
+	    p->state == BR_STATE_FORWARDING)
+		br_fdb_insert(br, p, skb->mac.ethernet->h_source, 0);
+
+	if (p->state != BR_STATE_FORWARDING)
+		goto freeandout;
+
+	if (dest[0] & 1) {
+		br_flood(br, skb, 1);
+		br_pass_frame_up(br, skb);
+		return;
+	}
+
+	dst = br_fdb_get(br, dest);
+
+	if (dst != NULL && dst->is_local) {
+		br_pass_frame_up(br, skb);
+		br_fdb_put(dst);
+		return;
+	}
+
+	if (dst != NULL) {
+		br_forward(dst->dst, skb);
+		br_fdb_put(dst);
+		return;
+	}
+
+	br_flood(br, skb, 0);
+	return;
+
+ handle_special_frame:
+	if (!dest[5]) {
+		br_stp_handle_bpdu(skb);
+		return;
+	}
+
+ freeandout:
+	kfree_skb(skb);
+}
+
+void br_handle_frame(struct sk_buff *skb)
+{
+	struct net_bridge *br;
+
+	br = skb->dev->br_port->br;
+	read_lock(&br->lock);
+	__br_handle_frame(skb);
+	read_unlock(&br->lock);
+}