/*
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/*
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* Handle incoming frames
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* Handle incoming frames
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* Linux ethernet bridge
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* Linux ethernet bridge
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*
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*
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* Authors:
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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* Lennert Buytenhek <buytenh@gnu.org>
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*
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*
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* $Id: br_input.c,v 1.1.1.1 2004-04-15 01:16:26 phoenix Exp $
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* $Id: br_input.c,v 1.1.1.1 2004-04-15 01:16:26 phoenix Exp $
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*
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*
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* This program is free software; you can redistribute it and/or
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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* 2 of the License, or (at your option) any later version.
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*/
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*/
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/if_bridge.h>
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#include <linux/if_bridge.h>
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#include <linux/netfilter_bridge.h>
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#include <linux/netfilter_bridge.h>
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#include "br_private.h"
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#include "br_private.h"
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unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
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unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
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static int br_pass_frame_up_finish(struct sk_buff *skb)
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static int br_pass_frame_up_finish(struct sk_buff *skb)
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{
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{
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netif_rx(skb);
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netif_rx(skb);
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return 0;
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return 0;
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}
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}
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static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
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static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
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{
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{
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struct net_device *indev;
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struct net_device *indev;
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br->statistics.rx_packets++;
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br->statistics.rx_packets++;
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br->statistics.rx_bytes += skb->len;
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br->statistics.rx_bytes += skb->len;
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indev = skb->dev;
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indev = skb->dev;
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skb->dev = &br->dev;
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skb->dev = &br->dev;
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skb->pkt_type = PACKET_HOST;
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skb->pkt_type = PACKET_HOST;
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skb_push(skb, ETH_HLEN);
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skb_push(skb, ETH_HLEN);
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skb->protocol = eth_type_trans(skb, &br->dev);
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skb->protocol = eth_type_trans(skb, &br->dev);
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NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
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NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
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br_pass_frame_up_finish);
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br_pass_frame_up_finish);
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}
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}
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static int br_handle_frame_finish(struct sk_buff *skb)
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static int br_handle_frame_finish(struct sk_buff *skb)
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{
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{
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struct net_bridge *br;
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struct net_bridge *br;
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unsigned char *dest;
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unsigned char *dest;
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struct net_bridge_fdb_entry *dst;
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struct net_bridge_fdb_entry *dst;
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struct net_bridge_port *p;
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struct net_bridge_port *p;
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int passedup;
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int passedup;
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dest = skb->mac.ethernet->h_dest;
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dest = skb->mac.ethernet->h_dest;
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p = skb->dev->br_port;
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p = skb->dev->br_port;
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if (p == NULL)
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if (p == NULL)
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goto err_nolock;
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goto err_nolock;
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br = p->br;
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br = p->br;
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read_lock(&br->lock);
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read_lock(&br->lock);
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if (skb->dev->br_port == NULL)
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if (skb->dev->br_port == NULL)
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goto err;
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goto err;
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passedup = 0;
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passedup = 0;
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if (br->dev.flags & IFF_PROMISC) {
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if (br->dev.flags & IFF_PROMISC) {
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struct sk_buff *skb2;
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struct sk_buff *skb2;
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skb2 = skb_clone(skb, GFP_ATOMIC);
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skb2 = skb_clone(skb, GFP_ATOMIC);
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if (skb2 != NULL) {
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if (skb2 != NULL) {
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passedup = 1;
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passedup = 1;
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br_pass_frame_up(br, skb2);
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br_pass_frame_up(br, skb2);
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}
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}
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}
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}
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if (dest[0] & 1) {
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if (dest[0] & 1) {
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br_flood_forward(br, skb, !passedup);
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br_flood_forward(br, skb, !passedup);
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if (!passedup)
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if (!passedup)
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br_pass_frame_up(br, skb);
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br_pass_frame_up(br, skb);
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goto out;
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goto out;
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}
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}
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dst = br_fdb_get(br, dest);
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dst = br_fdb_get(br, dest);
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if (dst != NULL && dst->is_local) {
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if (dst != NULL && dst->is_local) {
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if (!passedup)
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if (!passedup)
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br_pass_frame_up(br, skb);
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br_pass_frame_up(br, skb);
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else
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else
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kfree_skb(skb);
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kfree_skb(skb);
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br_fdb_put(dst);
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br_fdb_put(dst);
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goto out;
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goto out;
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}
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}
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if (dst != NULL) {
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if (dst != NULL) {
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br_forward(dst->dst, skb);
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br_forward(dst->dst, skb);
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br_fdb_put(dst);
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br_fdb_put(dst);
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goto out;
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goto out;
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}
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}
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br_flood_forward(br, skb, 0);
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br_flood_forward(br, skb, 0);
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out:
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out:
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read_unlock(&br->lock);
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read_unlock(&br->lock);
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return 0;
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return 0;
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err:
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err:
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read_unlock(&br->lock);
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read_unlock(&br->lock);
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err_nolock:
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err_nolock:
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kfree_skb(skb);
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kfree_skb(skb);
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return 0;
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return 0;
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}
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}
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void br_handle_frame(struct sk_buff *skb)
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void br_handle_frame(struct sk_buff *skb)
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{
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{
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struct net_bridge *br;
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struct net_bridge *br;
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unsigned char *dest;
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unsigned char *dest;
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struct net_bridge_port *p;
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struct net_bridge_port *p;
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dest = skb->mac.ethernet->h_dest;
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dest = skb->mac.ethernet->h_dest;
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p = skb->dev->br_port;
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p = skb->dev->br_port;
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if (p == NULL)
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if (p == NULL)
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goto err_nolock;
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goto err_nolock;
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br = p->br;
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br = p->br;
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read_lock(&br->lock);
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read_lock(&br->lock);
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if (skb->dev->br_port == NULL)
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if (skb->dev->br_port == NULL)
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goto err;
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goto err;
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if (!(br->dev.flags & IFF_UP) ||
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if (!(br->dev.flags & IFF_UP) ||
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p->state == BR_STATE_DISABLED)
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p->state == BR_STATE_DISABLED)
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goto err;
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goto err;
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if (skb->mac.ethernet->h_source[0] & 1)
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if (skb->mac.ethernet->h_source[0] & 1)
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goto err;
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goto err;
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if (p->state == BR_STATE_LEARNING ||
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if (p->state == BR_STATE_LEARNING ||
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p->state == BR_STATE_FORWARDING)
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p->state == BR_STATE_FORWARDING)
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br_fdb_insert(br, p, skb->mac.ethernet->h_source, 0);
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br_fdb_insert(br, p, skb->mac.ethernet->h_source, 0);
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if (br->stp_enabled &&
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if (br->stp_enabled &&
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!memcmp(dest, bridge_ula, 5) &&
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!memcmp(dest, bridge_ula, 5) &&
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!(dest[5] & 0xF0))
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!(dest[5] & 0xF0))
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goto handle_special_frame;
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goto handle_special_frame;
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if (p->state == BR_STATE_FORWARDING) {
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if (p->state == BR_STATE_FORWARDING) {
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NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
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NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
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br_handle_frame_finish);
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br_handle_frame_finish);
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read_unlock(&br->lock);
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read_unlock(&br->lock);
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return;
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return;
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}
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}
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err:
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err:
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read_unlock(&br->lock);
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read_unlock(&br->lock);
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err_nolock:
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err_nolock:
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kfree_skb(skb);
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kfree_skb(skb);
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return;
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return;
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handle_special_frame:
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handle_special_frame:
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if (!dest[5]) {
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if (!dest[5]) {
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NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,NULL,
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NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,NULL,
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br_stp_handle_bpdu);
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br_stp_handle_bpdu);
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read_unlock(&br->lock);
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read_unlock(&br->lock);
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return;
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return;
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}
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}
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read_unlock(&br->lock);
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read_unlock(&br->lock);
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kfree_skb(skb);
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kfree_skb(skb);
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}
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}
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