patch-2.3.35 linux/net/bridge/br.c
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- Lines: 904
- Date:
Tue Dec 21 10:17:31 1999
- Orig file:
v2.3.34/linux/net/bridge/br.c
- Orig date:
Tue Nov 23 22:42:21 1999
diff -u --recursive --new-file v2.3.34/linux/net/bridge/br.c linux/net/bridge/br.c
@@ -40,10 +40,19 @@
* so blame me first if its broken ;)
*
* Robert Pintarelli: fixed bug in bpdu time values
+ *
+ * Matthew Grant: start ports disabled.
+ * auto-promiscuous mode on port enable/disable
+ * fleshed out interface event handling, interfaces
+ * now register with bridge on module load as well as ifup
+ * port control ioctls with ifindex support
+ * brg0 logical ethernet interface
+ * reworked brcfg to take interface arguments
+ * added support for changing the hardware address
+ * generally made bridge a lot more usable.
*
* Todo:
- * Don't bring up devices automatically. Start ports disabled
- * and use a netlink notifier so a daemon can maintain the bridge
+ * Use a netlink notifier so a daemon can maintain the bridge
* port group (could we also do multiple groups ????).
* A nice /proc file interface.
* Put the path costs in the port info and devices.
@@ -52,6 +61,7 @@
*
*/
+#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
@@ -60,10 +70,13 @@
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
+#include <linux/malloc.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/ip.h>
@@ -71,6 +84,7 @@
#include <linux/init.h>
#include <asm/uaccess.h>
#include <asm/system.h>
+#include <linux/rtnetlink.h>
#include <net/br.h>
#include <linux/proc_fs.h>
@@ -144,11 +158,20 @@
static int br_flood(struct sk_buff *skb, int port);
static int br_drop(struct sk_buff *skb);
static int br_learn(struct sk_buff *skb, int port); /* 3.8 */
+static int br_protocol_ok(unsigned short protocol);
+static int br_find_port(int ifindex);
+static void br_get_ifnames(void);
+static int brg_rx(struct sk_buff *skb, int port);
static unsigned char bridge_ula[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
static Bridge_data bridge_info; /* (4.5.3) */
Port_data port_info[All_ports]; /* (4.5.5) */
+/* MAG: Maximum port registered - used to speed up flooding and to make
+ * have a large ports array more efficient
+ */
+static int max_port_used = 0;
+
/* JRP: fdb cache 1/port save kmalloc/kfree on every frame */
struct fdb *newfdb[All_ports];
int allocated_fdb_cnt = 0;
@@ -189,6 +212,30 @@
0
};
+
+/*
+ * the following data is for the bridge network device
+ */
+struct brg_if {
+ struct net_device dev;
+ char name[IFNAMSIZ];
+};
+static struct brg_if brg_if;
+
+/*
+ * Here to save linkage? problems
+ */
+
+static inline int find_port(struct net_device *dev)
+{
+ int i;
+
+ for (i = One; i <= No_of_ports; i++)
+ if (port_info[i].dev == dev)
+ return(i);
+ return(0);
+}
+
/*
* Implementation of Protocol specific bridging
*
@@ -201,7 +248,7 @@
/* Checks if that protocol type is to be bridged */
-int br_protocol_ok(unsigned short protocol)
+static int inline br_protocol_ok(unsigned short protocol)
{
unsigned x;
@@ -830,12 +877,19 @@
return len;
}
+
void __init br_init(void)
{ /* (4.8.1) */
int port_no;
- printk(KERN_INFO "NET4: Ethernet Bridge 005 for NET4.0\n");
+ printk(KERN_INFO "NET4: Ethernet Bridge 006 for NET4.0\n");
+ /* Set up brg device information */
+ bridge_info.instance = 0;
+ brg_init();
+
+ max_port_used = 0;
+
/*
* Form initial topology change time.
* The topology change timer is only used if this is the root bridge.
@@ -865,8 +919,8 @@
stop_topology_change_timer();
memset(newfdb, 0, sizeof(newfdb));
for (port_no = One; port_no <= No_of_ports; port_no++) { /* (4.8.1.4) */
- /* initial state = Enable */
- user_port_state[port_no] = ~Disabled;
+ /* initial state = Disable */
+ user_port_state[port_no] = Disabled;
port_priority[port_no] = 128;
br_init_port(port_no);
disable_port(port_no);
@@ -1194,7 +1248,7 @@
memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
if (br_stats.flags & BR_DEBUG)
- printk("send_%s_bpdu: port %i src %02x:%02x:%02x:%02x:%02x:%02x\n",
+ printk(KERN_DEBUG "send_%s_bpdu: port %i src %02x:%02x:%02x:%02x:%02x:%02x\n",
pdu_name,
port_no,
eth->h_source[0],
@@ -1295,6 +1349,9 @@
if (dev->flags & IFF_LOOPBACK)
return(NOTIFY_DONE);
+ if (dev == &brg_if.dev)
+ return(NOTIFY_DONE); /* Don't attach the brg device to a port! */
+
switch (event)
{
case NETDEV_DOWN:
@@ -1324,6 +1381,9 @@
{
port_info[i].dev = dev;
port_info[i].port_id = i;
+ dev->bridge_port_id = i;
+ if( i > max_port_used )
+ max_port_used = i;
/* set bridge addr from 1st device addr */
if (((htonl(bridge_info.bridge_id.BRIDGE_ID[0])&0xffff) == 0) &&
(bridge_info.bridge_id.BRIDGE_ID[1] == 0))
@@ -1333,7 +1393,10 @@
bridge_info.bridge_id.BRIDGE_PRIORITY = htons(32768);
set_bridge_priority(&bridge_info.bridge_id);
}
+ /* Add local MAC address */
br_add_local_mac(dev->dev_addr);
+ /* Save MAC address for latter change address events */
+ memcpy(port_info[i].ifmac.BRIDGE_ID_ULA, dev->dev_addr, 6);
if((br_stats.flags & BR_UP) &&
(user_port_state[i] != Disabled))
{
@@ -1351,19 +1414,116 @@
}
}
break;
+ case NETDEV_REGISTER:
+ if (br_stats.flags & BR_DEBUG)
+ printk(KERN_DEBUG "br_device_event: NETDEV_REGISTER...\n");
+ /* printk(KERN_ERR "br_device_event: NETDEV_REGISTER...\n"); */
+ /* printk(KERN_ERR "br_device_event: dev->type: 0x%X\n", dev->type); */
+ /* Only handle ethernet ports */
+ if(dev->type!=ARPHRD_ETHER && dev->type!=ARPHRD_LOOPBACK)
+ return NOTIFY_DONE;
+ /* printk(KERN_ERR "br_device_event: Looking for port...\n"); */
+ for (i = One; i <= No_of_ports; i++)
+ {
+ if (port_info[i].dev == NULL || port_info[i].dev == dev)
+ {
+ /* printk(KERN_ERR "br_device_event: Found port %d\n", i); */
+ port_info[i].dev = dev;
+ port_info[i].port_id = i;
+ dev->bridge_port_id = i;
+ if( i > max_port_used )
+ max_port_used = i;
+ /* handle local MAC address minuplations */
+ br_add_local_mac(dev->dev_addr);
+ memcpy(port_info[i].ifmac.BRIDGE_ID_ULA, dev->dev_addr, 6);
+ return NOTIFY_DONE;
+ break;
+ }
+ }
+ break;
case NETDEV_UNREGISTER:
if (br_stats.flags & BR_DEBUG)
printk(KERN_DEBUG "br_device_event: NETDEV_UNREGISTER...\n");
i = find_port(dev);
if (i > 0) {
br_avl_delete_by_port(i);
+ memset(port_info[i].ifmac.BRIDGE_ID_ULA, 0, 6);
port_info[i].dev = NULL;
}
break;
+ case NETDEV_CHANGEADDR:
+ if (br_stats.flags & BR_DEBUG)
+ printk(KERN_DEBUG "br_device_event: NETDEV_CHANGEADDR...\n");
+ i = find_port(dev);
+ if (i <= 0)
+ break;
+ if (memcmp(port_info[i].ifmac.BRIDGE_ID_ULA, dev->dev_addr, 6) != 0)
+ break; /* Don't worry about a change of hardware broadcast address! */
+ if (dev->start) {
+ printk(KERN_CRIT "br_device_event: NETDEV_CHANGEADDR on busy device %s - FIX DRIVER!\n",
+ dev->name);
+ /* return NOTIFY_BAD; It SHOULD be this, but I want to be friendly... */
+ return NOTIFY_DONE;
+ }
+ br_avl_delete_by_port(i);
+ memset(port_info[i].ifmac.BRIDGE_ID_ULA, 0, 6);
+ break;
}
return NOTIFY_DONE;
}
+/* Routine to loop over device list and register
+ * interfaces to bridge. Called from last part of net_dev_init just before
+ * bootp/rarp interface setup
+ */
+void br_spacedevice_register(void)
+{
+ struct net_device *dev;
+ for( dev = dev_base; dev != NULL; dev = dev->next)
+ {
+ br_device_event(NULL, NETDEV_REGISTER, dev);
+ }
+}
+
+
+/* This is for SPEED in the kernel in net_bh.c */
+
+int br_call_bridge(struct sk_buff *skb, unsigned short type)
+{
+ int port;
+ struct net_device *dev;
+
+#if 0 /* Checked first in handle_bridge to save expense of function call */
+ if(!(br_stats.flags & BR_UP))
+ return 0;
+#endif
+
+ dev = skb->dev;
+ port = dev->bridge_port_id;
+
+ if(!port)
+ return 0;
+
+ /* Sanity - make sure we are not leaping off into fairy space! */
+ if ( port < 0 || port > max_port_used || port_info[port].dev != dev) {
+ if (net_ratelimit())
+ printk(KERN_CRIT "br_call_bridge: device %s has invalid port ID %d!\n",
+ dev->name,
+ dev->bridge_port_id);
+ return 0;
+ }
+
+ if(user_port_state[port] == Disabled)
+ return 0;
+
+ if (!br_protocol_ok(ntohs(type)))
+ return 0;
+
+ return 1;
+
+}
+
+
/*
* following routine is called when a frame is received
* from an interface, it returns 1 when it consumes the
@@ -1375,6 +1535,7 @@
int port;
Port_data *p;
struct ethhdr *eth;
+ struct net_device *dev;
/* sanity */
if (!skb) {
@@ -1382,17 +1543,27 @@
return(1);
}
+ dev = skb->dev;
+
skb->pkt_bridged = IS_BRIDGED;
/* check for loopback */
- if (skb->dev->flags & IFF_LOOPBACK)
+ if (dev->flags & IFF_LOOPBACK)
return 0 ;
- port = find_port(skb->dev);
+#if 0
+ port = find_port(dev);
+#else
+ port = dev->bridge_port_id;
+#endif
if(!port)
return 0;
+ /* Hand off to brg_rx BEFORE we screw up the skb */
+ if(brg_rx(skb, port))
+ return(1);
+
skb->nh.raw = skb->mac.raw;
eth = skb->mac.ethernet;
p = &port_info[port];
@@ -1501,7 +1672,7 @@
eth = skb->mac.ethernet;
port = 0; /* an impossible port (locally generated) */
if (br_stats.flags & BR_DEBUG)
- printk("br_tx_fr : port %i src %02x:%02x:%02x:%02x:%02x:%02x"
+ printk(KERN_DEBUG "br_tx_fr : port %i src %02x:%02x:%02x:%02x:%02x:%02x"
" dest %02x:%02x:%02x:%02x:%02x:%02x\n",
port,
eth->h_source[0],
@@ -1739,7 +1910,7 @@
/* timer expired, invalidate entry */
f->flags &= ~FDB_ENT_VALID;
if (br_stats.flags & BR_DEBUG)
- printk("fdb entry expired...\n");
+ printk(KERN_DEBUG "fdb entry expired...\n");
/*
* Send flood and drop original
*/
@@ -1781,7 +1952,7 @@
/* timer expired, invalidate entry */
f->flags &= ~FDB_ENT_VALID;
if (br_stats.flags & BR_DEBUG)
- printk("fdb entry expired...\n");
+ printk(KERN_DEBUG "fdb entry expired...\n");
++br_stats_cnt.drop_same_port_aged;
}
else ++br_stats_cnt.drop_same_port;
@@ -1808,6 +1979,9 @@
{
if (i == port) /* don't send back where we got it */
continue;
+ if (i > max_port_used)
+ /* Don't go scanning empty port entries */
+ break;
if (port_info[i].state == Forwarding)
{
nskb = skb_clone(skb, GFP_ATOMIC);
@@ -1820,7 +1994,7 @@
/* To get here we must have done ARP already,
or have a received valid MAC header */
-/* printk("Flood to port %d\n",i);*/
+/* printk(KERN_DEBUG "Flood to port %d\n",i);*/
nskb->nh.raw = nskb->data + ETH_HLEN;
nskb->priority = 1;
dev_queue_xmit(nskb);
@@ -1829,16 +2003,6 @@
return(0);
}
-static int find_port(struct net_device *dev)
-{
- int i;
-
- for (i = One; i <= No_of_ports; i++)
- if (port_info[i].dev == dev)
- return(i);
- return(0);
-}
-
/*
* FIXME: This needs to come from the device structs, eg for
* 10,100,1Gbit ethernet.
@@ -1945,17 +2109,58 @@
return fdbis;
}
+
+/* Fill in interface names in port_info structure
+ */
+static void br_get_ifnames(void) {
+ int i;
+
+ for(i=One;i<=No_of_ports; i++) {
+ /* memset IS needed. Kernel strncpy does NOT NULL terminate strings when limit
+ reached */
+ memset(port_info[i].ifname, 0, IFNAMSIZ);
+ if( port_info[i].dev == 0 )
+ continue;
+ strncpy(port_info[i].ifname, port_info[i].dev->name, IFNAMSIZ-1);
+ /* Being paranoid */
+ port_info[i].ifname[IFNAMSIZ-1] = '\0';
+ }
+}
+
+/* Given an interface index, loop over port array to see if configured. If
+ so, return port number, otherwise error */
+static int br_find_port(int ifindex)
+{
+ int i;
+
+ for(i=1; i <= No_of_ports; i++) {
+ if (port_info[i].dev == 0)
+ continue;
+ if (port_info[i].dev->ifindex == ifindex)
+ return(i);
+ }
+
+ return -EUNATCH; /* Tell me if this is incorrect error code for this case */
+}
+
+
int br_ioctl(unsigned int cmd, void *arg)
{
- int err, i;
+ int err, i, ifflags;
struct br_cf bcf;
bridge_id_t new_id;
-
+ struct net_device *dev;
+
switch(cmd)
{
case SIOCGIFBR: /* get bridging control blocks */
memcpy(&br_stats.bridge_data, &bridge_info, sizeof(Bridge_data));
- memcpy(&br_stats.port_data, &port_info, sizeof(Port_data)*No_of_ports);
+
+ /* Fill in interface names in port_info*/
+ br_get_ifnames();
+
+ br_stats.num_ports = No_of_ports;
+ memcpy(&br_stats.port_data, &port_info, sizeof(Port_data)*All_ports);
err = copy_to_user(arg, &br_stats, sizeof(struct br_stat));
if (err)
@@ -2021,16 +2226,28 @@
}
br_stats.flags ^= BR_STP_DISABLED;
break;
+ case BRCMD_IF_ENABLE:
+ bcf.arg1 = br_find_port(bcf.arg1);
+ if (bcf.arg1 < 0)
+ return(bcf.arg1);
case BRCMD_PORT_ENABLE:
if (port_info[bcf.arg1].dev == 0)
return(-EINVAL);
if (user_port_state[bcf.arg1] != Disabled)
return(-EALREADY);
printk(KERN_DEBUG "br: enabling port %i\n",bcf.arg1);
+ dev = port_info[bcf.arg1].dev;
+ ifflags = (dev->flags&~(IFF_PROMISC|IFF_ALLMULTI))
+ |(dev->gflags&(IFF_PROMISC|IFF_ALLMULTI));
+ dev_change_flags(dev, ifflags|IFF_PROMISC);
user_port_state[bcf.arg1] = ~Disabled;
if(br_stats.flags & BR_UP)
enable_port(bcf.arg1);
break;
+ case BRCMD_IF_DISABLE:
+ bcf.arg1 = br_find_port(bcf.arg1);
+ if (bcf.arg1 < 0)
+ return(bcf.arg1);
case BRCMD_PORT_DISABLE:
if (port_info[bcf.arg1].dev == 0)
return(-EINVAL);
@@ -2040,12 +2257,20 @@
user_port_state[bcf.arg1] = Disabled;
if(br_stats.flags & BR_UP)
disable_port(bcf.arg1);
+ dev = port_info[bcf.arg1].dev;
+ ifflags = (dev->flags&~(IFF_PROMISC|IFF_ALLMULTI))
+ |(dev->gflags&(IFF_PROMISC|IFF_ALLMULTI));
+ dev_change_flags(port_info[bcf.arg1].dev, ifflags & ~IFF_PROMISC);
break;
case BRCMD_SET_BRIDGE_PRIORITY:
new_id = bridge_info.bridge_id;
new_id.BRIDGE_PRIORITY = htons(bcf.arg1);
set_bridge_priority(&new_id);
break;
+ case BRCMD_SET_IF_PRIORITY:
+ bcf.arg1 = br_find_port(bcf.arg1);
+ if (bcf.arg1 < 0)
+ return(bcf.arg1);
case BRCMD_SET_PORT_PRIORITY:
if((port_info[bcf.arg1].dev == 0)
|| (bcf.arg2 & ~0xff))
@@ -2053,6 +2278,10 @@
port_priority[bcf.arg1] = bcf.arg2;
set_port_priority(bcf.arg1);
break;
+ case BRCMD_SET_IF_PATH_COST:
+ bcf.arg1 = br_find_port(bcf.arg1);
+ if (bcf.arg1 < 0)
+ return(bcf.arg1);
case BRCMD_SET_PATH_COST:
if (port_info[bcf.arg1].dev == 0)
return(-EINVAL);
@@ -2134,3 +2363,377 @@
}
return(0);
}
+
+
+
+
+/* --------------------------------------------------------------------------------
+ *
+ *
+ * Bridge network device here for future modularization - device structures
+ * must be 'static' inside bridge instance
+ * Modelled after sch_teql.c
+ *
+ */
+
+
+
+/*
+ * Index to functions.
+ */
+
+int brg_probe(struct net_device *dev);
+static int brg_open(struct net_device *dev);
+static int brg_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static int brg_close(struct net_device *dev);
+static struct net_device_stats *brg_get_stats(struct net_device *dev);
+static void brg_set_multicast_list(struct net_device *dev);
+
+/*
+ * Board-specific info in dev->priv.
+ */
+
+struct net_local
+{
+ __u32 groups;
+ struct net_device_stats stats;
+};
+
+
+
+
+/*
+ * To call this a probe is a bit misleading, however for real
+ * hardware it would have to check what was present.
+ */
+
+int __init brg_probe(struct net_device *dev)
+{
+ unsigned int bogomips;
+ struct timeval utime;
+
+ printk(KERN_INFO "%s: network interface for Ethernet Bridge 006/NET4.0\n", dev->name);
+
+ /*
+ * Initialize the device structure.
+ */
+
+ dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
+ if (dev->priv == NULL)
+ return -ENOMEM;
+ memset(dev->priv, 0, sizeof(struct net_local));
+
+ /* Set up MAC address based on BogoMIPs figure for first CPU and time
+ */
+ bogomips = (boot_cpu_data.loops_per_sec+2500)/500000 ;
+ get_fast_time(&utime);
+
+ /* Ummmm.... YES! */
+ dev->dev_addr[0] = '\xFE';
+ dev->dev_addr[1] = '\xFD';
+ dev->dev_addr[2] = (bridge_info.instance & 0x0F) << 4;
+ dev->dev_addr[2] |= ((utime.tv_sec & 0x000F0000) >> 16);
+ dev->dev_addr[3] = bogomips & 0xFF;
+ dev->dev_addr[4] = (utime.tv_sec & 0x0000FF00) >> 8;
+ dev->dev_addr[5] = (utime.tv_sec & 0x000000FF);
+
+ printk(KERN_INFO "%s: generated MAC address %2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X\n",
+ dev->name,
+ dev->dev_addr[0],
+ dev->dev_addr[1],
+ dev->dev_addr[2],
+ dev->dev_addr[3],
+ dev->dev_addr[4],
+ dev->dev_addr[5]);
+
+
+ printk(KERN_INFO "%s: attached to bridge instance %lu\n", dev->name, dev->base_addr);
+
+ /*
+ * The brg specific entries in the device structure.
+ */
+
+ dev->open = brg_open;
+ dev->hard_start_xmit = brg_start_xmit;
+ dev->stop = brg_close;
+ dev->get_stats = brg_get_stats;
+ dev->set_multicast_list = brg_set_multicast_list;
+
+ /*
+ * Setup the generic properties
+ */
+
+ ether_setup(dev);
+
+ dev->tx_queue_len = 0;
+
+ return 0;
+}
+
+/*
+ * Open/initialize the board.
+ */
+
+static int brg_open(struct net_device *dev)
+{
+ if (br_stats.flags & BR_DEBUG)
+ printk(KERN_DEBUG "%s: Doing brg_open()...", dev->name);
+
+ if (memcmp(dev->dev_addr, "\x00\x00\x00\x00\x00\x00", ETH_ALEN) == 0)
+ return -EFAULT;
+
+ dev->start = 1;
+ dev->tbusy = 0;
+ return 0;
+}
+
+static unsigned brg_mc_hash(__u8 *dest)
+{
+ unsigned idx = 0;
+ idx ^= dest[0];
+ idx ^= dest[1];
+ idx ^= dest[2];
+ idx ^= dest[3];
+ idx ^= dest[4];
+ idx ^= dest[5];
+ return 1U << (idx&0x1F);
+}
+
+static void brg_set_multicast_list(struct net_device *dev)
+{
+ unsigned groups = ~0;
+ struct net_local *lp = (struct net_local *)dev->priv;
+
+ if (!(dev->flags&(IFF_PROMISC|IFF_ALLMULTI))) {
+ struct dev_mc_list *dmi;
+
+ groups = brg_mc_hash(dev->broadcast);
+
+ for (dmi=dev->mc_list; dmi; dmi=dmi->next) {
+ if (dmi->dmi_addrlen != 6)
+ continue;
+ groups |= brg_mc_hash(dmi->dmi_addr);
+ }
+ }
+ lp->groups = groups;
+}
+
+/*
+ * We transmit by throwing the packet at the bridge.
+ */
+
+static int brg_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct net_local *lp = (struct net_local *)dev->priv;
+ struct ethhdr *eth = (struct ethhdr*)skb->data;
+ int port;
+
+ /* Deal with the bridge being disabled */
+ if(!(br_stats.flags & BR_UP)) {
+ /* Either this */
+ /* lp->stats.tx_errors++; */ /* this condition is NOT an error */
+ /* or this (implied by RFC 2233) */
+ lp->stats.tx_dropped++;
+ dev_kfree_skb(skb);
+ return 0;
+ }
+
+ lp->stats.tx_bytes+=skb->len;
+ lp->stats.tx_packets++;
+
+#if 0
+ ++br_stats_cnt.port_not_disable;
+#endif
+ skb->mac.raw = skb->nh.raw = skb->data;
+ eth = skb->mac.ethernet;
+ port = 0; /* an impossible port (locally generated) */
+
+ if (br_stats.flags & BR_DEBUG)
+ printk(KERN_DEBUG "%s: brg_start_xmit - src %02x:%02x:%02x:%02x:%02x:%02x"
+ " dest %02x:%02x:%02x:%02x:%02x:%02x\n",
+ dev->name,
+ eth->h_source[0],
+ eth->h_source[1],
+ eth->h_source[2],
+ eth->h_source[3],
+ eth->h_source[4],
+ eth->h_source[5],
+ eth->h_dest[0],
+ eth->h_dest[1],
+ eth->h_dest[2],
+ eth->h_dest[3],
+ eth->h_dest[4],
+ eth->h_dest[5]);
+
+ /* Forward the packet ! */
+ if(br_forward(skb, port))
+ return(0);
+
+ /* Throw packet initially */
+ dev_kfree_skb(skb);
+ return 0;
+}
+
+
+/*
+ * The typical workload of the driver:
+ * Handle the ether interface interrupts.
+ *
+ * (In this case handle the packets posted from the bridge)
+ */
+
+static int brg_rx(struct sk_buff *skb, int port)
+{
+ struct net_device *dev = &brg_if.dev;
+ struct net_local *lp = (struct net_local *)dev->priv;
+ struct ethhdr *eth = (struct ethhdr*)(skb->data);
+ int len = skb->len;
+ int clone = 0;
+
+ if (br_stats.flags & BR_DEBUG)
+ printk(KERN_DEBUG "%s: brg_rx()\n", dev->name);
+
+ /* Get out of here if the bridge interface is not up
+ */
+ if(!(dev->flags & IFF_UP))
+ return(0);
+
+ /* Check that the port that this thing came off is in the forwarding state
+ * We sould only listen to the same address scope we will transmit to.
+ */
+ if(port_info[port].state != Forwarding)
+ return(0);
+
+ /* Is this for us? - broadcast/mulitcast/promiscuous packets need cloning,
+ * with uni-cast we eat the packet
+ */
+ clone = 0;
+ if (dev->flags & IFF_PROMISC) {
+ clone = 1;
+ }
+ else if (eth->h_dest[0]&1) {
+ if (!(dev->flags&(IFF_ALLMULTI))
+ && !(brg_mc_hash(eth->h_dest)&lp->groups))
+ return(0);
+ clone = 1;
+ }
+ else if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN) != 0) {
+ return(0);
+ }
+
+ /* Clone things here - we want to be transparent before we check packet data
+ * integrity
+ */
+ if(clone) {
+ struct sk_buff *skb2 = skb;
+ skb = skb_clone(skb2, GFP_ATOMIC);
+ if (skb == NULL) {
+ return(0);
+ }
+
+ }
+
+ /* Check packet length
+ */
+ if (len < 16) {
+ printk(KERN_DEBUG "%s : rx len = %d\n", dev->name, len);
+ kfree_skb(skb);
+ return(!clone);
+ }
+
+ if (br_stats.flags & BR_DEBUG)
+ printk(KERN_DEBUG "%s: brg_rx - src %02x:%02x:%02x:%02x:%02x:%02x"
+ " dest %02x:%02x:%02x:%02x:%02x:%02x\n",
+ dev->name,
+ eth->h_source[0],
+ eth->h_source[1],
+ eth->h_source[2],
+ eth->h_source[3],
+ eth->h_source[4],
+ eth->h_source[5],
+ eth->h_dest[0],
+ eth->h_dest[1],
+ eth->h_dest[2],
+ eth->h_dest[3],
+ eth->h_dest[4],
+ eth->h_dest[5]);
+
+ /* Do it */
+ skb->pkt_type = PACKET_HOST;
+ skb->dev = dev;
+ skb->protocol=eth_type_trans(skb,dev);
+ memset(skb->cb, 0, sizeof(skb->cb));
+ lp->stats.rx_packets++;
+ lp->stats.rx_bytes+=len;
+ netif_rx(skb);
+ return(!clone);
+}
+
+static int brg_close(struct net_device *dev)
+{
+ if (br_stats.flags & BR_DEBUG)
+ printk(KERN_DEBUG "%s: Shutting down.\n", dev->name);
+
+ dev->tbusy = 1;
+ dev->start = 0;
+
+ return 0;
+}
+
+static struct net_device_stats *brg_get_stats(struct net_device *dev)
+{
+ struct net_local *lp = (struct net_local *)dev->priv;
+ return &lp->stats;
+}
+
+/*
+ *
+ */
+
+int __init brg_init(void)
+{
+ int err;
+
+ memset(&brg_if, 0, sizeof(brg_if));
+
+ rtnl_lock();
+
+ brg_if.dev.base_addr = bridge_info.instance;
+ sprintf (brg_if.name, "brg%d", bridge_info.instance);
+ brg_if.dev.name = (void*)&brg_if.name;
+ if(dev_get(brg_if.name)) {
+ printk(KERN_INFO "%s already loaded.\n", brg_if.name);
+ return -EBUSY;
+ }
+ brg_if.dev.init = brg_probe;
+
+ err = register_netdevice(&brg_if.dev);
+ rtnl_unlock();
+ return err;
+}
+
+
+#if 0 /* Its here if we ever need it... */
+#ifdef MODULE
+
+void cleanup_module(void)
+{
+
+ /*
+ * Unregister the device
+ */
+ rtnl_lock();
+ unregister_netdevice(&the_master.dev);
+ rtnl_unlock();
+
+ /*
+ * Free up the private structure.
+ */
+
+ kfree(brg_if.dev.priv);
+ brg_if.dev.priv = NULL; /* gets re-allocated by brg_probe */
+}
+
+#endif /* MODULE */
+
+#endif
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)