patch-2.3.47 linux/net/bridge/br_if.c

• Lines: 294
• Date: Sun Feb 20 10:41:18 2000
• Orig file: v2.3.46/linux/net/bridge/br_if.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.46/linux/net/bridge/br_if.c linux/net/bridge/br_if.c
@@ -0,0 +1,293 @@
+/*
+ *	Userspace interface
+ *	Linux ethernet bridge
+ *
+ *	Authors:
+ *	Lennert Buytenhek		<buytenh@gnu.org>
+ *
+ *	$Id: br_if.c,v 1.1 2000/02/18 16:47:12 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/if_bridge.h>
+#include <linux/inetdevice.h>
+#include <linux/rtnetlink.h>
+#include <asm/uaccess.h>
+#include "br_private.h"
+
+static struct net_bridge *bridge_list;
+
+static int br_initial_port_cost(struct net_device *dev)
+{
+	if (!strncmp(dev->name, "lec", 3))
+		return 7;
+
+	if (!strncmp(dev->name, "eth", 3))
+		return 100;			/* FIXME handle 100Mbps */
+
+	if (!strncmp(dev->name, "plip", 4))
+		return 2500;
+
+	return 100;
+}
+
+/* called under bridge lock */
+static int __br_del_if(struct net_bridge *br, struct net_device *dev)
+{
+	struct net_bridge_port *p;
+	struct net_bridge_port **pptr;
+
+	if ((p = dev->br_port) == NULL)
+		return -EINVAL;
+
+	br_stp_disable_port(p);
+
+	dev_set_promiscuity(dev, -1);
+	dev->br_port = NULL;
+
+	pptr = &br->port_list;
+	while (*pptr != NULL) {
+		if (*pptr == p) {
+			*pptr = p->next;
+			break;
+		}
+
+		pptr = &((*pptr)->next);
+	}
+
+	br_fdb_delete_by_port(br, p);
+	kfree(p);
+	dev_put(dev);
+
+	return 0;
+}
+
+static struct net_bridge **__find_br(char *name)
+{
+	struct net_bridge **b;
+	struct net_bridge *br;
+
+	b = &bridge_list;
+	while ((br = *b) != NULL) {
+		if (!strncmp(br->name, name, IFNAMSIZ))
+			return b;
+
+		b = &(br->next);
+	}
+
+	return NULL;
+}
+
+static void del_ifs(struct net_bridge *br)
+{
+	write_lock_bh(&br->lock);
+	while (br->port_list != NULL)
+		__br_del_if(br, br->port_list->dev);
+	write_unlock_bh(&br->lock);
+}
+
+static struct net_bridge *new_nb(char *name)
+{
+	struct net_bridge *br;
+	struct net_device *dev;
+
+	if ((br = kmalloc(sizeof(*br), GFP_KERNEL)) == NULL)
+		return NULL;
+
+	memset(br, 0, sizeof(*br));
+	dev = &br->dev;
+
+	strncpy(br->name, name, IFNAMSIZ);
+	dev->priv = br;
+	dev->name = br->name;
+	ether_setup(dev);
+	br_dev_setup(dev);
+
+	br->lock = RW_LOCK_UNLOCKED;
+	br->hash_lock = RW_LOCK_UNLOCKED;
+
+	br->bridge_id.prio[0] = 0x80;
+	br->bridge_id.prio[1] = 0x00;
+	memset(br->bridge_id.addr, 0, ETH_ALEN);
+
+	br->stp_enabled = 1;
+	br->designated_root = br->bridge_id;
+	br->root_path_cost = 0;
+	br->root_port = 0;
+	br->bridge_max_age = br->max_age = 20 * HZ;
+	br->bridge_hello_time = br->hello_time = 2 * HZ;
+	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
+	br->topology_change = 0;
+	br->topology_change_detected = 0;
+	br_timer_clear(&br->hello_timer);
+	br_timer_clear(&br->tcn_timer);
+	br_timer_clear(&br->topology_change_timer);
+
+	br->ageing_time = 300 * HZ;
+	br->gc_interval = 4 * HZ;
+
+	return br;
+}
+
+/* called under bridge lock */
+static struct net_bridge_port *new_nbp(struct net_bridge *br, struct net_device *dev)
+{
+	int i;
+	struct net_bridge_port *p;
+
+	p = kmalloc(sizeof(*p), GFP_KERNEL);
+	if (p == NULL)
+		return p;
+
+	memset(p, 0, sizeof(*p));
+	p->br = br;
+	p->dev = dev;
+	p->path_cost = br_initial_port_cost(dev);
+	p->priority = 0x80;
+
+	dev->br_port = p;
+
+	for (i=1;i<255;i++)
+		if (br_get_port(br, i) == NULL)
+			break;
+
+	if (i == 255) {
+		kfree(p);
+		return NULL;
+	}
+
+	p->port_no = i;
+	br_init_port(p);
+	p->state = BR_STATE_DISABLED;
+
+	p->next = br->port_list;
+	br->port_list = p;
+
+	return p;
+}
+
+int br_add_bridge(char *name)
+{
+	struct net_bridge *br;
+
+	if ((br = new_nb(name)) == NULL)
+		return -ENOMEM;
+
+	if (__dev_get_by_name(name) != NULL) {
+		kfree(br);
+		return -EEXIST;
+	}
+
+	br->next = bridge_list;
+	bridge_list = br;
+
+	br_inc_use_count();
+	register_netdev(&br->dev);
+
+	return 0;
+}
+
+int br_del_bridge(char *name)
+{
+	struct net_bridge **b;
+	struct net_bridge *br;
+
+	if ((b = __find_br(name)) == NULL)
+		return -ENXIO;
+
+	br = *b;
+
+	if (br->dev.flags & IFF_UP)
+		return -EBUSY;
+
+	del_ifs(br);
+
+	*b = br->next;
+
+	unregister_netdev(&br->dev);
+	kfree(br);
+	br_dec_use_count();
+
+	return 0;
+}
+
+int br_add_if(struct net_bridge *br, struct net_device *dev)
+{
+	struct net_bridge_port *p;
+
+	if (dev->br_port != NULL)
+		return -EBUSY;
+
+	if (dev->flags & IFF_LOOPBACK)
+		return -EINVAL;
+
+	dev_hold(dev);
+	write_lock_bh(&br->lock);
+	if ((p = new_nbp(br, dev)) == NULL) {
+		write_unlock_bh(&br->lock);
+		dev_put(dev);
+		return -EXFULL;
+	}
+
+	dev_set_promiscuity(dev, 1);
+
+	br_stp_recalculate_bridge_id(br);
+	br_fdb_insert(br, p, dev->dev_addr, 1);
+	if ((br->dev.flags & IFF_UP) && (dev->flags & IFF_UP))
+		br_stp_enable_port(p);
+	write_unlock_bh(&br->lock);
+
+	return 0;
+}
+
+int br_del_if(struct net_bridge *br, struct net_device *dev)
+{
+	int retval;
+
+	write_lock_bh(&br->lock);
+	retval = __br_del_if(br, dev);
+	br_stp_recalculate_bridge_id(br);
+	write_unlock_bh(&br->lock);
+
+	return retval;
+}
+
+int br_get_bridge_ifindices(int *indices, int num)
+{
+	struct net_bridge *br;
+	int i;
+
+	i = 0;
+
+	br = bridge_list;
+	for (i=0;i<num;i++) {
+		if (br == NULL)
+			break;
+
+		indices[i] = br->dev.ifindex;
+		br = br->next;
+	}
+
+	return i;
+}
+
+/* called under ioctl_lock */
+void br_get_port_ifindices(struct net_bridge *br, int *ifindices)
+{
+	int i;
+	struct net_bridge_port *p;
+
+	for (i=0;i<256;i++)
+		ifindices[i] = 0;
+
+	p = br->port_list;
+	while (p != NULL) {
+		ifindices[p->port_no] = p->dev->ifindex;
+		p = p->next;
+	}
+}