2 * Handle incoming frames
3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * $Id: br_input.c,v 1.10 2001/12/24 04:50:20 davem Exp $
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/netfilter_bridge.h>
20 #include "br_private.h"
22 const unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
24 static int br_pass_frame_up_finish(struct sk_buff *skb)
26 #ifdef CONFIG_NETFILTER_DEBUG
34 static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
36 struct net_device *indev;
38 br->statistics.rx_packets++;
39 br->statistics.rx_bytes += skb->len;
44 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
45 br_pass_frame_up_finish);
48 int br_handle_frame_finish(struct sk_buff *skb)
50 struct net_bridge *br;
52 struct net_bridge_fdb_entry *dst;
53 struct net_bridge_port *p;
56 dest = skb->mac.ethernet->h_dest;
59 p = skb->dev->br_port;
60 smp_read_barrier_depends();
62 if (p == NULL || p->state == BR_STATE_DISABLED) {
69 if (br->dev->flags & IFF_PROMISC) {
72 skb2 = skb_clone(skb, GFP_ATOMIC);
75 br_pass_frame_up(br, skb2);
80 br_flood_forward(br, skb, !passedup);
82 br_pass_frame_up(br, skb);
86 dst = br_fdb_get(br, dest);
87 if (dst != NULL && dst->is_local) {
89 br_pass_frame_up(br, skb);
97 br_forward(dst->dst, skb);
102 br_flood_forward(br, skb, 0);
109 int br_handle_frame(struct sk_buff *skb)
112 struct net_bridge_port *p;
114 dest = skb->mac.ethernet->h_dest;
117 p = skb->dev->br_port;
118 if (p == NULL || p->state == BR_STATE_DISABLED)
121 if (skb->mac.ethernet->h_source[0] & 1)
124 if (p->state == BR_STATE_LEARNING ||
125 p->state == BR_STATE_FORWARDING)
126 br_fdb_insert(p->br, p, skb->mac.ethernet->h_source, 0);
128 if (p->br->stp_enabled &&
129 !memcmp(dest, bridge_ula, 5) &&
132 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
133 NULL, br_stp_handle_bpdu);
139 else if (p->state == BR_STATE_FORWARDING) {
140 if (br_should_route_hook && br_should_route_hook(&skb)) {
145 if (!memcmp(p->br->dev->dev_addr, dest, ETH_ALEN))
146 skb->pkt_type = PACKET_HOST;
148 NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
149 br_handle_frame_finish);