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 /* note: already called with rcu_read_lock (preempt_disabled) */
49 int br_handle_frame_finish(struct sk_buff *skb)
51 const unsigned char *dest = eth_hdr(skb)->h_dest;
52 struct net_bridge_port *p = skb->dev->br_port;
53 struct net_bridge *br = p->br;
54 struct net_bridge_fdb_entry *dst;
57 if (br->dev->flags & IFF_PROMISC) {
60 skb2 = skb_clone(skb, GFP_ATOMIC);
63 br_pass_frame_up(br, skb2);
68 br_flood_forward(br, skb, !passedup);
70 br_pass_frame_up(br, skb);
74 dst = __br_fdb_get(br, dest);
75 if (dst != NULL && dst->is_local) {
77 br_pass_frame_up(br, skb);
84 br_forward(dst->dst, skb);
88 br_flood_forward(br, skb, 0);
95 * Called via br_handle_frame_hook.
96 * Return 0 if *pskb should be processed furthur
97 * 1 if *pskb is handled
98 * note: already called with rcu_read_lock (preempt_disabled)
100 int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
102 struct sk_buff *skb = *pskb;
103 const unsigned char *dest = eth_hdr(skb)->h_dest;
105 if (p->state == BR_STATE_DISABLED)
108 if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
111 if (p->state == BR_STATE_LEARNING ||
112 p->state == BR_STATE_FORWARDING)
113 br_fdb_update(p->br, p, eth_hdr(skb)->h_source);
115 if (p->br->stp_enabled &&
116 !memcmp(dest, bridge_ula, 5) &&
119 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
120 NULL, br_stp_handle_bpdu);
125 else if (p->state == BR_STATE_FORWARDING) {
126 if (br_should_route_hook) {
127 if (br_should_route_hook(pskb))
130 dest = eth_hdr(skb)->h_dest;
133 if (!memcmp(p->br->dev->dev_addr, dest, ETH_ALEN))
134 skb->pkt_type = PACKET_HOST;
136 NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
137 br_handle_frame_finish);