mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 12:11:40 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
145 lines
3.1 KiB
C
145 lines
3.1 KiB
C
/*
|
|
* Handle incoming frames
|
|
* Linux ethernet bridge
|
|
*
|
|
* Authors:
|
|
* Lennert Buytenhek <buytenh@gnu.org>
|
|
*
|
|
* $Id: br_input.c,v 1.10 2001/12/24 04:50:20 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/netfilter_bridge.h>
|
|
#include "br_private.h"
|
|
|
|
const unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
|
|
|
|
static int br_pass_frame_up_finish(struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
|
skb->nf_debug = 0;
|
|
#endif
|
|
netif_rx(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
|
|
{
|
|
struct net_device *indev;
|
|
|
|
br->statistics.rx_packets++;
|
|
br->statistics.rx_bytes += skb->len;
|
|
|
|
indev = skb->dev;
|
|
skb->dev = br->dev;
|
|
|
|
NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
|
|
br_pass_frame_up_finish);
|
|
}
|
|
|
|
/* note: already called with rcu_read_lock (preempt_disabled) */
|
|
int br_handle_frame_finish(struct sk_buff *skb)
|
|
{
|
|
const unsigned char *dest = eth_hdr(skb)->h_dest;
|
|
struct net_bridge_port *p = skb->dev->br_port;
|
|
struct net_bridge *br = p->br;
|
|
struct net_bridge_fdb_entry *dst;
|
|
int passedup = 0;
|
|
|
|
if (br->dev->flags & IFF_PROMISC) {
|
|
struct sk_buff *skb2;
|
|
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (skb2 != NULL) {
|
|
passedup = 1;
|
|
br_pass_frame_up(br, skb2);
|
|
}
|
|
}
|
|
|
|
if (dest[0] & 1) {
|
|
br_flood_forward(br, skb, !passedup);
|
|
if (!passedup)
|
|
br_pass_frame_up(br, skb);
|
|
goto out;
|
|
}
|
|
|
|
dst = __br_fdb_get(br, dest);
|
|
if (dst != NULL && dst->is_local) {
|
|
if (!passedup)
|
|
br_pass_frame_up(br, skb);
|
|
else
|
|
kfree_skb(skb);
|
|
goto out;
|
|
}
|
|
|
|
if (dst != NULL) {
|
|
br_forward(dst->dst, skb);
|
|
goto out;
|
|
}
|
|
|
|
br_flood_forward(br, skb, 0);
|
|
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called via br_handle_frame_hook.
|
|
* Return 0 if *pskb should be processed furthur
|
|
* 1 if *pskb is handled
|
|
* note: already called with rcu_read_lock (preempt_disabled)
|
|
*/
|
|
int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
|
|
{
|
|
struct sk_buff *skb = *pskb;
|
|
const unsigned char *dest = eth_hdr(skb)->h_dest;
|
|
|
|
if (p->state == BR_STATE_DISABLED)
|
|
goto err;
|
|
|
|
if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
|
|
goto err;
|
|
|
|
if (p->state == BR_STATE_LEARNING ||
|
|
p->state == BR_STATE_FORWARDING)
|
|
br_fdb_update(p->br, p, eth_hdr(skb)->h_source);
|
|
|
|
if (p->br->stp_enabled &&
|
|
!memcmp(dest, bridge_ula, 5) &&
|
|
!(dest[5] & 0xF0)) {
|
|
if (!dest[5]) {
|
|
NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
|
|
NULL, br_stp_handle_bpdu);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
else if (p->state == BR_STATE_FORWARDING) {
|
|
if (br_should_route_hook) {
|
|
if (br_should_route_hook(pskb))
|
|
return 0;
|
|
skb = *pskb;
|
|
dest = eth_hdr(skb)->h_dest;
|
|
}
|
|
|
|
if (!memcmp(p->br->dev->dev_addr, dest, ETH_ALEN))
|
|
skb->pkt_type = PACKET_HOST;
|
|
|
|
NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
|
|
br_handle_frame_finish);
|
|
return 1;
|
|
}
|
|
|
|
err:
|
|
kfree_skb(skb);
|
|
return 1;
|
|
}
|