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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [bridge/] [br_input.c] - Blame information for rev 1774

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/*
 *      Handle incoming frames
 *      Linux ethernet bridge
 *
 *      Authors:
 *      Lennert Buytenhek               <buytenh@gnu.org>
 *
 *      $Id: br_input.c,v 1.1.1.1 2004-04-15 01:16:26 phoenix 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/if_bridge.h>
#include <linux/netfilter_bridge.h>
#include "br_private.h"
 
unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
 
static int br_pass_frame_up_finish(struct sk_buff *skb)
{
        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;
        skb->pkt_type = PACKET_HOST;
        skb_push(skb, ETH_HLEN);
        skb->protocol = eth_type_trans(skb, &br->dev);
 
        NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,
                        br_pass_frame_up_finish);
}
 
static int br_handle_frame_finish(struct sk_buff *skb)
{
        struct net_bridge *br;
        unsigned char *dest;
        struct net_bridge_fdb_entry *dst;
        struct net_bridge_port *p;
        int passedup;
 
        dest = skb->mac.ethernet->h_dest;
 
        p = skb->dev->br_port;
        if (p == NULL)
                goto err_nolock;
 
        br = p->br;
        read_lock(&br->lock);
        if (skb->dev->br_port == NULL)
                goto err;
 
        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);
                br_fdb_put(dst);
                goto out;
        }
 
        if (dst != NULL) {
                br_forward(dst->dst, skb);
                br_fdb_put(dst);
                goto out;
        }
 
        br_flood_forward(br, skb, 0);
 
out:
        read_unlock(&br->lock);
        return 0;
 
err:
        read_unlock(&br->lock);
err_nolock:
        kfree_skb(skb);
        return 0;
}
 
void br_handle_frame(struct sk_buff *skb)
{
        struct net_bridge *br;
        unsigned char *dest;
        struct net_bridge_port *p;
 
        dest = skb->mac.ethernet->h_dest;
 
        p = skb->dev->br_port;
        if (p == NULL)
                goto err_nolock;
 
        br = p->br;
        read_lock(&br->lock);
        if (skb->dev->br_port == NULL)
                goto err;
 
        if (!(br->dev.flags & IFF_UP) ||
            p->state == BR_STATE_DISABLED)
                goto err;
 
        if (skb->mac.ethernet->h_source[0] & 1)
                goto err;
 
        if (p->state == BR_STATE_LEARNING ||
            p->state == BR_STATE_FORWARDING)
                br_fdb_insert(br, p, skb->mac.ethernet->h_source, 0);
 
        if (br->stp_enabled &&
            !memcmp(dest, bridge_ula, 5) &&
            !(dest[5] & 0xF0))
                goto handle_special_frame;
 
        if (p->state == BR_STATE_FORWARDING) {
                NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
                        br_handle_frame_finish);
                read_unlock(&br->lock);
                return;
        }
 
err:
        read_unlock(&br->lock);
err_nolock:
        kfree_skb(skb);
        return;
 
handle_special_frame:
        if (!dest[5]) {
                NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,NULL,
                        br_stp_handle_bpdu);
                read_unlock(&br->lock);
                return;
        }
 
        read_unlock(&br->lock);
        kfree_skb(skb);
}

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* Handle incoming frames`
3			`* Linux ethernet bridge`
4			`*`
5			`* Authors:`
6			`* Lennert Buytenhek <buytenh@gnu.org>`
7			`*`
8			`* $Id: br_input.c,v 1.1.1.1 2004-04-15 01:16:26 phoenix Exp $`
9			`*`
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.`
14			`*/`
15
16			`#include <linux/kernel.h>`
17			`#include <linux/netdevice.h>`
18			`#include <linux/etherdevice.h>`
19			`#include <linux/if_bridge.h>`
20			`#include <linux/netfilter_bridge.h>`
21			`#include "br_private.h"`
22
23			`unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };`
24
25			`static int br_pass_frame_up_finish(struct sk_buff *skb)`
26			`{`
27			`netif_rx(skb);`
28
29			`return 0;`
30			`}`
31
32			`static void br_pass_frame_up(struct net_bridge br, struct sk_buff skb)`
33			`{`
34			`struct net_device *indev;`
35
36			`br->statistics.rx_packets++;`
37			`br->statistics.rx_bytes += skb->len;`
38
39			`indev = skb->dev;`
40			`skb->dev = &br->dev;`
41			`skb->pkt_type = PACKET_HOST;`
42			`skb_push(skb, ETH_HLEN);`
43			`skb->protocol = eth_type_trans(skb, &br->dev);`
44
45			`NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL,`
46			`br_pass_frame_up_finish);`
47			`}`
48
49			`static int br_handle_frame_finish(struct sk_buff *skb)`
50			`{`
51			`struct net_bridge *br;`
52			`unsigned char *dest;`
53			`struct net_bridge_fdb_entry *dst;`
54			`struct net_bridge_port *p;`
55			`int passedup;`
56
57			`dest = skb->mac.ethernet->h_dest;`
58
59			`p = skb->dev->br_port;`
60			`if (p == NULL)`
61			`goto err_nolock;`
62
63			`br = p->br;`
64			`read_lock(&br->lock);`
65			`if (skb->dev->br_port == NULL)`
66			`goto err;`
67
68			`passedup = 0;`
69			`if (br->dev.flags & IFF_PROMISC) {`
70			`struct sk_buff *skb2;`
71
72			`skb2 = skb_clone(skb, GFP_ATOMIC);`
73			`if (skb2 != NULL) {`
74			`passedup = 1;`
75			`br_pass_frame_up(br, skb2);`
76			`}`
77			`}`
78
79			`if (dest[0] & 1) {`
80			`br_flood_forward(br, skb, !passedup);`
81			`if (!passedup)`
82			`br_pass_frame_up(br, skb);`
83			`goto out;`
84			`}`
85
86			`dst = br_fdb_get(br, dest);`
87			`if (dst != NULL && dst->is_local) {`
88			`if (!passedup)`
89			`br_pass_frame_up(br, skb);`
90			`else`
91			`kfree_skb(skb);`
92			`br_fdb_put(dst);`
93			`goto out;`
94			`}`
95
96			`if (dst != NULL) {`
97			`br_forward(dst->dst, skb);`
98			`br_fdb_put(dst);`
99			`goto out;`
100			`}`
101
102			`br_flood_forward(br, skb, 0);`
103
104			`out:`
105			`read_unlock(&br->lock);`
106			`return 0;`
107
108			`err:`
109			`read_unlock(&br->lock);`
110			`err_nolock:`
111			`kfree_skb(skb);`
112			`return 0;`
113			`}`
114
115			`void br_handle_frame(struct sk_buff *skb)`
116			`{`
117			`struct net_bridge *br;`
118			`unsigned char *dest;`
119			`struct net_bridge_port *p;`
120
121			`dest = skb->mac.ethernet->h_dest;`
122
123			`p = skb->dev->br_port;`
124			`if (p == NULL)`
125			`goto err_nolock;`
126
127			`br = p->br;`
128			`read_lock(&br->lock);`
129			`if (skb->dev->br_port == NULL)`
130			`goto err;`
131
132			`if (!(br->dev.flags & IFF_UP) \|\|`
133			`p->state == BR_STATE_DISABLED)`
134			`goto err;`
135
136			`if (skb->mac.ethernet->h_source[0] & 1)`
137			`goto err;`
138
139			`if (p->state == BR_STATE_LEARNING \|\|`
140			`p->state == BR_STATE_FORWARDING)`
141			`br_fdb_insert(br, p, skb->mac.ethernet->h_source, 0);`
142
143			`if (br->stp_enabled &&`
144			`!memcmp(dest, bridge_ula, 5) &&`
145			`!(dest[5] & 0xF0))`
146			`goto handle_special_frame;`
147
148			`if (p->state == BR_STATE_FORWARDING) {`
149			`NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,`
150			`br_handle_frame_finish);`
151			`read_unlock(&br->lock);`
152			`return;`
153			`}`
154
155			`err:`
156			`read_unlock(&br->lock);`
157			`err_nolock:`
158			`kfree_skb(skb);`
159			`return;`
160
161			`handle_special_frame:`
162			`if (!dest[5]) {`
163			`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			`}`
168
169			`read_unlock(&br->lock);`
170			`kfree_skb(skb);`
171			`}`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [bridge/] [br_input.c] - Blame information for rev 1774