datapath: rename brcompat.c to brcompat_main.c

This just makes it easier to subsequently rename the brcompat_mod module
to brcompat without introducing circular dependencies.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Jesse Gross <jesse@nicira.com>

1 files changed, 0 insertions, 578 deletions

diff --git a/datapath/brcompat.c b/datapath/brcompat.c
deleted file mode 100644
index d4a0acad..00000000
--- a/datapath/brcompat.c
+++ /dev/null
@@ -1,578 +0,0 @@
-/*
- * Copyright (c) 2007-2012 Nicira Networks.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/uaccess.h>
-#include <linux/completion.h>
-#include <linux/etherdevice.h>
-#include <linux/if_bridge.h>
-#include <linux/netdevice.h>
-#include <linux/rtnetlink.h>
-#include <net/genetlink.h>
-
-#include "openvswitch/brcompat-netlink.h"
-#include "datapath.h"
-
-static struct genl_family brc_genl_family;
-static struct genl_multicast_group brc_mc_group;
-
-/* Time to wait for ovs-vswitchd to respond to a datapath action, in
- * jiffies. */
-#define BRC_TIMEOUT (HZ * 5)
-
-/* Mutex to serialize ovs-brcompatd callbacks.  (Some callbacks naturally hold
- * br_ioctl_mutex, others hold rtnl_lock, but we can't take the former
- * ourselves and we don't want to hold the latter over a potentially long
- * period of time.) */
-static DEFINE_MUTEX(brc_serial);
-
-/* Userspace communication. */
-static DEFINE_SPINLOCK(brc_lock);    /* Ensure atomic access to these vars. */
-static DECLARE_COMPLETION(brc_done); /* Userspace signaled operation done? */
-static struct sk_buff *brc_reply;    /* Reply from userspace. */
-static u32 brc_seq;		     /* Sequence number for current op. */
-
-static struct sk_buff *brc_send_command(struct net *,
-					struct sk_buff *,
-					struct nlattr **attrs);
-static int brc_send_simple_command(struct net *, struct sk_buff *);
-
-static struct sk_buff *brc_make_request(int op, const char *bridge,
-					const char *port)
-{
-	struct sk_buff *skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
-	if (!skb)
-		goto error;
-
-	genlmsg_put(skb, 0, 0, &brc_genl_family, 0, op);
-	if (bridge)
-		NLA_PUT_STRING(skb, BRC_GENL_A_DP_NAME, bridge);
-	if (port)
-		NLA_PUT_STRING(skb, BRC_GENL_A_PORT_NAME, port);
-	return skb;
-
-nla_put_failure:
-	kfree_skb(skb);
-error:
-	return NULL;
-}
-
-static int brc_send_simple_command(struct net *net, struct sk_buff *request)
-{
-	struct nlattr *attrs[BRC_GENL_A_MAX + 1];
-	struct sk_buff *reply;
-	int error;
-
-	reply = brc_send_command(net, request, attrs);
-	if (IS_ERR(reply))
-		return PTR_ERR(reply);
-
-	error = nla_get_u32(attrs[BRC_GENL_A_ERR_CODE]);
-	kfree_skb(reply);
-	return -error;
-}
-
-static int brc_add_del_bridge(struct net *net, char __user *uname, int add)
-{
-	struct sk_buff *request;
-	char name[IFNAMSIZ];
-
-	if (!capable(CAP_NET_ADMIN))
-		return -EPERM;
-
-	if (copy_from_user(name, uname, IFNAMSIZ))
-		return -EFAULT;
-
-	name[IFNAMSIZ - 1] = 0;
-	request = brc_make_request(add ? BRC_GENL_C_DP_ADD : BRC_GENL_C_DP_DEL,
-				   name, NULL);
-	if (!request)
-		return -ENOMEM;
-
-	return brc_send_simple_command(net, request);
-}
-
-static int brc_get_indices(struct net *net,
-			   int op, const char *br_name,
-			   int __user *uindices, int n)
-{
-	struct nlattr *attrs[BRC_GENL_A_MAX + 1];
-	struct sk_buff *request, *reply;
-	int *indices;
-	int ret;
-	int len;
-
-	if (n < 0)
-		return -EINVAL;
-	if (n >= 2048)
-		return -ENOMEM;
-
-	request = brc_make_request(op, br_name, NULL);
-	if (!request)
-		return -ENOMEM;
-
-	reply = brc_send_command(net, request, attrs);
-	ret = PTR_ERR(reply);
-	if (IS_ERR(reply))
-		goto exit;
-
-	ret = -nla_get_u32(attrs[BRC_GENL_A_ERR_CODE]);
-	if (ret < 0)
-		goto exit_free_skb;
-
-	ret = -EINVAL;
-	if (!attrs[BRC_GENL_A_IFINDEXES])
-		goto exit_free_skb;
-
-	len = nla_len(attrs[BRC_GENL_A_IFINDEXES]);
-	indices = nla_data(attrs[BRC_GENL_A_IFINDEXES]);
-	if (len % sizeof(int))
-		goto exit_free_skb;
-
-	n = min_t(int, n, len / sizeof(int));
-	ret = copy_to_user(uindices, indices, n * sizeof(int)) ? -EFAULT : n;
-
-exit_free_skb:
-	kfree_skb(reply);
-exit:
-	return ret;
-}
-
-/* Called with br_ioctl_mutex. */
-static int brc_get_bridges(struct net *net, int __user *uindices, int n)
-{
-	return brc_get_indices(net, BRC_GENL_C_GET_BRIDGES, NULL, uindices, n);
-}
-
-/* Legacy deviceless bridge ioctl's.  Called with br_ioctl_mutex. */
-static int old_deviceless(struct net *net, void __user *uarg)
-{
-	unsigned long args[3];
-
-	if (copy_from_user(args, uarg, sizeof(args)))
-		return -EFAULT;
-
-	switch (args[0]) {
-	case BRCTL_GET_BRIDGES:
-		return brc_get_bridges(net, (int __user *)args[1], args[2]);
-
-	case BRCTL_ADD_BRIDGE:
-		return brc_add_del_bridge(net, (void __user *)args[1], 1);
-	case BRCTL_DEL_BRIDGE:
-		return brc_add_del_bridge(net, (void __user *)args[1], 0);
-	}
-
-	return -EOPNOTSUPP;
-}
-
-/* Called with the br_ioctl_mutex. */
-static int
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
-brc_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
-{
-	struct net *net = NULL;
-#else
-brc_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
-{
-#endif
-	switch (cmd) {
-	case SIOCGIFBR:
-	case SIOCSIFBR:
-		return old_deviceless(net, uarg);
-
-	case SIOCBRADDBR:
-		return brc_add_del_bridge(net, uarg, 1);
-	case SIOCBRDELBR:
-		return brc_add_del_bridge(net, uarg, 0);
-	}
-
-	return -EOPNOTSUPP;
-}
-
-static int brc_add_del_port(struct net_device *dev, int port_ifindex, int add)
-{
-	struct sk_buff *request;
-	struct net_device *port;
-	int err;
-
-	if (!capable(CAP_NET_ADMIN))
-		return -EPERM;
-
-	port = __dev_get_by_index(dev_net(dev), port_ifindex);
-	if (!port)
-		return -EINVAL;
-
-	/* Save name of dev and port because there's a race between the
-	 * rtnl_unlock() and the brc_send_simple_command(). */
-	request = brc_make_request(add ? BRC_GENL_C_PORT_ADD : BRC_GENL_C_PORT_DEL,
-				   dev->name, port->name);
-	if (!request)
-		return -ENOMEM;
-
-	rtnl_unlock();
-	err = brc_send_simple_command(dev_net(dev), request);
-	rtnl_lock();
-
-	return err;
-}
-
-static int brc_get_bridge_info(struct net_device *dev,
-			       struct __bridge_info __user *ub)
-{
-	struct __bridge_info b;
-
-	memset(&b, 0, sizeof(struct __bridge_info));
-
-	/* First two bytes are the priority, which we should skip.  This comes
-	 * from struct bridge_id in br_private.h, which is unavailable to us.
-	 */
-	memcpy((u8 *)&b.bridge_id + 2, dev->dev_addr, ETH_ALEN);
-	b.stp_enabled = 0;
-
-	if (copy_to_user(ub, &b, sizeof(struct __bridge_info)))
-		return -EFAULT;
-
-	return 0;
-}
-
-static int brc_get_port_list(struct net_device *dev, int __user *uindices,
-			     int num)
-{
-	int retval;
-
-	rtnl_unlock();
-	retval = brc_get_indices(dev_net(dev), BRC_GENL_C_GET_PORTS, dev->name,
-				 uindices, num);
-	rtnl_lock();
-
-	return retval;
-}
-
-/*
- * Format up to a page worth of forwarding table entries
- * userbuf -- where to copy result
- * maxnum  -- maximum number of entries desired
- *            (limited to a page for sanity)
- * offset  -- number of records to skip
- */
-static int brc_get_fdb_entries(struct net_device *dev, void __user *userbuf,
-			       unsigned long maxnum, unsigned long offset)
-{
-	struct nlattr *attrs[BRC_GENL_A_MAX + 1];
-	struct sk_buff *request, *reply;
-	int retval;
-	int len;
-
-	/* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
-	if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
-		maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
-
-	request = brc_make_request(BRC_GENL_C_FDB_QUERY, dev->name, NULL);
-	if (!request)
-		return -ENOMEM;
-	NLA_PUT_U64(request, BRC_GENL_A_FDB_COUNT, maxnum);
-	NLA_PUT_U64(request, BRC_GENL_A_FDB_SKIP, offset);
-
-	rtnl_unlock();
-	reply = brc_send_command(dev_net(dev), request, attrs);
-	retval = PTR_ERR(reply);
-	if (IS_ERR(reply))
-		goto exit;
-
-	retval = -nla_get_u32(attrs[BRC_GENL_A_ERR_CODE]);
-	if (retval < 0)
-		goto exit_free_skb;
-
-	retval = -EINVAL;
-	if (!attrs[BRC_GENL_A_FDB_DATA])
-		goto exit_free_skb;
-	len = nla_len(attrs[BRC_GENL_A_FDB_DATA]);
-	if (len % sizeof(struct __fdb_entry) ||
-	    len / sizeof(struct __fdb_entry) > maxnum)
-		goto exit_free_skb;
-
-	retval = len / sizeof(struct __fdb_entry);
-	if (copy_to_user(userbuf, nla_data(attrs[BRC_GENL_A_FDB_DATA]), len))
-		retval = -EFAULT;
-
-exit_free_skb:
-	kfree_skb(reply);
-exit:
-	rtnl_lock();
-	return retval;
-
-nla_put_failure:
-	kfree_skb(request);
-	return -ENOMEM;
-}
-
-/* Legacy ioctl's through SIOCDEVPRIVATE.  Called with rtnl_lock. */
-static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
-	unsigned long args[4];
-
-	if (copy_from_user(args, rq->ifr_data, sizeof(args)))
-		return -EFAULT;
-
-	switch (args[0]) {
-	case BRCTL_ADD_IF:
-		return brc_add_del_port(dev, args[1], 1);
-	case BRCTL_DEL_IF:
-		return brc_add_del_port(dev, args[1], 0);
-
-	case BRCTL_GET_BRIDGE_INFO:
-		return brc_get_bridge_info(dev, (struct __bridge_info __user *)args[1]);
-
-	case BRCTL_GET_PORT_LIST:
-		return brc_get_port_list(dev, (int __user *)args[1], args[2]);
-
-	case BRCTL_GET_FDB_ENTRIES:
-		return brc_get_fdb_entries(dev, (void __user *)args[1],
-					   args[2], args[3]);
-	}
-
-	return -EOPNOTSUPP;
-}
-
-/* Called with the rtnl_lock. */
-static int brc_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
-	int err;
-
-	switch (cmd) {
-	case SIOCDEVPRIVATE:
-		err = old_dev_ioctl(dev, rq, cmd);
-		break;
-
-	case SIOCBRADDIF:
-		return brc_add_del_port(dev, rq->ifr_ifindex, 1);
-	case SIOCBRDELIF:
-		return brc_add_del_port(dev, rq->ifr_ifindex, 0);
-
-	default:
-		err = -EOPNOTSUPP;
-		break;
-	}
-
-	return err;
-}
-
-
-static struct genl_family brc_genl_family = {
-	.id = GENL_ID_GENERATE,
-	.hdrsize = 0,
-	.name = BRC_GENL_FAMILY_NAME,
-	.version = 1,
-	.maxattr = BRC_GENL_A_MAX,
-	 SET_NETNSOK
-};
-
-static int brc_genl_query(struct sk_buff *skb, struct genl_info *info)
-{
-	int err = -EINVAL;
-	struct sk_buff *ans_skb;
-	void *data;
-
-	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
-	if (!ans_skb)
-		return -ENOMEM;
-
-	data = genlmsg_put_reply(ans_skb, info, &brc_genl_family,
-				 0, BRC_GENL_C_QUERY_MC);
-	if (data == NULL) {
-		err = -ENOMEM;
-		goto err;
-	}
-	NLA_PUT_U32(ans_skb, BRC_GENL_A_MC_GROUP, brc_mc_group.id);
-
-	genlmsg_end(ans_skb, data);
-	return genlmsg_reply(ans_skb, info);
-
-err:
-nla_put_failure:
-	kfree_skb(ans_skb);
-	return err;
-}
-
-/* Attribute policy: what each attribute may contain.  */
-static struct nla_policy brc_genl_policy[BRC_GENL_A_MAX + 1] = {
-	[BRC_GENL_A_ERR_CODE] = { .type = NLA_U32 },
-	[BRC_GENL_A_FDB_DATA] = { .type = NLA_UNSPEC },
-};
-
-static int brc_genl_dp_result(struct sk_buff *skb, struct genl_info *info)
-{
-	unsigned long int flags;
-	int err;
-
-	if (!info->attrs[BRC_GENL_A_ERR_CODE])
-		return -EINVAL;
-
-	skb = skb_clone(skb, GFP_KERNEL);
-	if (!skb)
-		return -ENOMEM;
-
-	spin_lock_irqsave(&brc_lock, flags);
-	if (brc_seq == info->snd_seq) {
-		brc_seq++;
-
-		kfree_skb(brc_reply);
-		brc_reply = skb;
-
-		complete(&brc_done);
-		err = 0;
-	} else {
-		kfree_skb(skb);
-		err = -ESTALE;
-	}
-	spin_unlock_irqrestore(&brc_lock, flags);
-
-	return err;
-}
-
-static struct genl_ops brc_genl_ops[] = {
-	{ .cmd = BRC_GENL_C_QUERY_MC,
-	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privelege. */
-	  .policy = NULL,
-	  .doit = brc_genl_query,
-	},
-	{ .cmd = BRC_GENL_C_DP_RESULT,
-	  .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privelege. */
-	  .policy = brc_genl_policy,
-	  .doit = brc_genl_dp_result,
-	},
-};
-
-static struct sk_buff *brc_send_command(struct net *net,
-					struct sk_buff *request,
-					struct nlattr **attrs)
-{
-	unsigned long int flags;
-	struct sk_buff *reply;
-	int error;
-
-	mutex_lock(&brc_serial);
-
-	/* Increment sequence number first, so that we ignore any replies
-	 * to stale requests. */
-	spin_lock_irqsave(&brc_lock, flags);
-	nlmsg_hdr(request)->nlmsg_seq = ++brc_seq;
-	INIT_COMPLETION(brc_done);
-	spin_unlock_irqrestore(&brc_lock, flags);
-
-	nlmsg_end(request, nlmsg_hdr(request));
-
-	/* Send message. */
-	error = genlmsg_multicast_netns(net, request, 0,
-					brc_mc_group.id, GFP_KERNEL);
-	if (error < 0)
-		goto error;
-
-	/* Wait for reply. */
-	error = -ETIMEDOUT;
-	if (!wait_for_completion_timeout(&brc_done, BRC_TIMEOUT)) {
-		pr_warn("timed out waiting for userspace\n");
-		goto error;
-	}
-
-	/* Grab reply. */
-	spin_lock_irqsave(&brc_lock, flags);
-	reply = brc_reply;
-	brc_reply = NULL;
-	spin_unlock_irqrestore(&brc_lock, flags);
-
-	mutex_unlock(&brc_serial);
-
-	/* Re-parse message.  Can't fail, since it parsed correctly once
-	 * already. */
-	error = nlmsg_parse(nlmsg_hdr(reply), GENL_HDRLEN,
-			    attrs, BRC_GENL_A_MAX, brc_genl_policy);
-	WARN_ON(error);
-
-	return reply;
-
-error:
-	mutex_unlock(&brc_serial);
-	return ERR_PTR(error);
-}
-
-static int __init brc_init(void)
-{
-	int err;
-
-	pr_info("Open vSwitch Bridge Compatibility, built "__DATE__" "__TIME__"\n");
-
-	/* Set the bridge ioctl handler */
-	brioctl_set(brc_ioctl_deviceless_stub);
-
-	/* Set the openvswitch_mod device ioctl handler */
-	ovs_dp_ioctl_hook = brc_dev_ioctl;
-
-	/* Randomize the initial sequence number.  This is not a security
-	 * feature; it only helps avoid crossed wires between userspace and
-	 * the kernel when the module is unloaded and reloaded. */
-	brc_seq = net_random();
-
-	/* Register generic netlink family to communicate changes to
-	 * userspace. */
-	err = genl_register_family_with_ops(&brc_genl_family,
-					    brc_genl_ops, ARRAY_SIZE(brc_genl_ops));
-	if (err)
-		goto error;
-
-	strcpy(brc_mc_group.name, "brcompat");
-	err = genl_register_mc_group(&brc_genl_family, &brc_mc_group);
-	if (err < 0)
-		goto err_unregister;
-
-	return 0;
-
-err_unregister:
-	genl_unregister_family(&brc_genl_family);
-error:
-	pr_emerg("failed to install!\n");
-	return err;
-}
-
-static void brc_cleanup(void)
-{
-	/* Unregister ioctl hooks */
-	ovs_dp_ioctl_hook = NULL;
-	brioctl_set(NULL);
-
-	genl_unregister_family(&brc_genl_family);
-}
-
-module_init(brc_init);
-module_exit(brc_cleanup);
-
-MODULE_DESCRIPTION("Open vSwitch bridge compatibility");
-MODULE_AUTHOR("Nicira Networks");
-MODULE_LICENSE("GPL");
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
-/*
- * In kernels 2.6.36 and later, Open vSwitch can safely coexist with
- * the Linux bridge module, but it does not make sense to load both bridge and
- * brcompat_mod, so this prevents it.
- */
-BRIDGE_MUTUAL_EXCLUSION;
-#endif