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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [bridge/] [br_input.c] - Blame information for rev 1275

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Line No. Rev Author Line
1 1275 phoenix
/*
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 *      Handle incoming frames
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 *      Linux ethernet bridge
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 *
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 *      Authors:
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 *      Lennert Buytenhek               <buytenh@gnu.org>
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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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 *
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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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 *      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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 */
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/if_bridge.h>
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#include <linux/netfilter_bridge.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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static int br_pass_frame_up_finish(struct sk_buff *skb)
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{
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        netif_rx(skb);
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        return 0;
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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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{
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        struct net_device *indev;
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        br->statistics.rx_packets++;
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        br->statistics.rx_bytes += skb->len;
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        indev = skb->dev;
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        skb->dev = &br->dev;
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        skb->pkt_type = PACKET_HOST;
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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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        NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
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                        br_pass_frame_up_finish);
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}
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static int br_handle_frame_finish(struct sk_buff *skb)
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{
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        struct net_bridge *br;
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        unsigned char *dest;
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        struct net_bridge_fdb_entry *dst;
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        struct net_bridge_port *p;
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        int passedup;
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        dest = skb->mac.ethernet->h_dest;
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        p = skb->dev->br_port;
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        if (p == NULL)
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                goto err_nolock;
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        br = p->br;
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        read_lock(&br->lock);
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        if (skb->dev->br_port == NULL)
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                goto err;
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        passedup = 0;
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        if (br->dev.flags & IFF_PROMISC) {
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                struct sk_buff *skb2;
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                skb2 = skb_clone(skb, GFP_ATOMIC);
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                if (skb2 != NULL) {
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                        passedup = 1;
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                        br_pass_frame_up(br, skb2);
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                }
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        }
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        if (dest[0] & 1) {
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                br_flood_forward(br, skb, !passedup);
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                if (!passedup)
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                        br_pass_frame_up(br, skb);
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                goto out;
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        }
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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 (!passedup)
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                        br_pass_frame_up(br, skb);
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                else
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                        kfree_skb(skb);
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                br_fdb_put(dst);
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                goto out;
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        }
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        if (dst != NULL) {
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                br_forward(dst->dst, skb);
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                br_fdb_put(dst);
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                goto out;
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        }
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        br_flood_forward(br, skb, 0);
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out:
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        read_unlock(&br->lock);
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        return 0;
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err:
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        read_unlock(&br->lock);
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err_nolock:
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        kfree_skb(skb);
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        return 0;
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}
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void br_handle_frame(struct sk_buff *skb)
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{
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        struct net_bridge *br;
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        unsigned char *dest;
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        struct net_bridge_port *p;
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        dest = skb->mac.ethernet->h_dest;
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        p = skb->dev->br_port;
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        if (p == NULL)
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                goto err_nolock;
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        br = p->br;
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        read_lock(&br->lock);
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        if (skb->dev->br_port == NULL)
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                goto err;
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        if (!(br->dev.flags & IFF_UP) ||
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            p->state == BR_STATE_DISABLED)
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                goto err;
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        if (skb->mac.ethernet->h_source[0] & 1)
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                goto err;
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        if (p->state == BR_STATE_LEARNING ||
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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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143
        if (br->stp_enabled &&
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            !memcmp(dest, bridge_ula, 5) &&
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            !(dest[5] & 0xF0))
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                goto handle_special_frame;
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148
        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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                        br_handle_frame_finish);
151
                read_unlock(&br->lock);
152
                return;
153
        }
154
 
155
err:
156
        read_unlock(&br->lock);
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err_nolock:
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        kfree_skb(skb);
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        return;
160
 
161
handle_special_frame:
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        if (!dest[5]) {
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                NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,NULL,
164
                        br_stp_handle_bpdu);
165
                read_unlock(&br->lock);
166
                return;
167
        }
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169
        read_unlock(&br->lock);
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        kfree_skb(skb);
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}

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