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Date: Tue, 15 Apr 2008 16:57:11 +0400
From: Pavel Emelyanov <xemul@...nvz.org>
To: David Miller <davem@...emloft.net>
CC: Linux Netdev List <netdev@...r.kernel.org>
Subject: [PATCH net-2.6.26 4/8][GRE]: Make the fallback tunnel device per-net.
Everything is prepared for this change now. Create on in
init callback, use it over the code and destroy on net exit.
Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
---
net/ipv4/ip_gre.c | 63 +++++++++++++++++++++++++++--------------------------
1 files changed, 32 insertions(+), 31 deletions(-)
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 1a17c5b..a8ec090 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -126,10 +126,9 @@ static int ipgre_fb_tunnel_init(struct net_device *dev);
static int ipgre_net_id;
struct ipgre_net {
+ struct net_device *fb_tunnel_dev;
};
-static struct net_device *ipgre_fb_tunnel_dev;
-
/* Tunnel hash table */
/*
@@ -168,6 +167,7 @@ static struct ip_tunnel * ipgre_tunnel_lookup(struct net *net,
unsigned h0 = HASH(remote);
unsigned h1 = HASH(key);
struct ip_tunnel *t;
+ struct ipgre_net *ign = net_generic(net, ipgre_net_id);
for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) {
@@ -194,8 +194,8 @@ static struct ip_tunnel * ipgre_tunnel_lookup(struct net *net,
return t;
}
- if (ipgre_fb_tunnel_dev->flags&IFF_UP)
- return netdev_priv(ipgre_fb_tunnel_dev);
+ if (ign->fb_tunnel_dev->flags&IFF_UP)
+ return netdev_priv(ign->fb_tunnel_dev);
return NULL;
}
@@ -977,7 +977,7 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
switch (cmd) {
case SIOCGETTUNNEL:
t = NULL;
- if (dev == ipgre_fb_tunnel_dev) {
+ if (dev == ign->fb_tunnel_dev) {
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
err = -EFAULT;
break;
@@ -1016,7 +1016,7 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
- if (dev != ipgre_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
+ if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
if (t != NULL) {
if (t->dev != dev) {
err = -EEXIST;
@@ -1071,7 +1071,7 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
if (!capable(CAP_NET_ADMIN))
goto done;
- if (dev == ipgre_fb_tunnel_dev) {
+ if (dev == ign->fb_tunnel_dev) {
err = -EFAULT;
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
goto done;
@@ -1079,7 +1079,7 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL)
goto done;
err = -EPERM;
- if (t == netdev_priv(ipgre_fb_tunnel_dev))
+ if (t == netdev_priv(ign->fb_tunnel_dev))
goto done;
dev = t->dev;
}
@@ -1270,7 +1270,7 @@ static int ipgre_tunnel_init(struct net_device *dev)
return 0;
}
-static int __init ipgre_fb_tunnel_init(struct net_device *dev)
+static int ipgre_fb_tunnel_init(struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
struct iphdr *iph = &tunnel->parms.iph;
@@ -1308,8 +1308,25 @@ static int ipgre_init_net(struct net *net)
if (err < 0)
goto err_assign;
+ ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0",
+ ipgre_tunnel_setup);
+ if (!ign->fb_tunnel_dev) {
+ err = -ENOMEM;
+ goto err_alloc_dev;
+ }
+
+ ign->fb_tunnel_dev->init = ipgre_fb_tunnel_init;
+ dev_net_set(ign->fb_tunnel_dev, net);
+
+ if ((err = register_netdev(ign->fb_tunnel_dev)))
+ goto err_reg_dev;
+
return 0;
+err_reg_dev:
+ free_netdev(ign->fb_tunnel_dev);
+err_alloc_dev:
+ /* nothing */
err_assign:
kfree(ign);
err_alloc:
@@ -1321,6 +1338,10 @@ static void ipgre_exit_net(struct net *net)
struct ipgre_net *ign;
ign = net_generic(net, ipgre_net_id);
+ rtnl_lock();
+ if (net != &init_net)
+ unregister_netdevice(ign->fb_tunnel_dev);
+ rtnl_unlock();
kfree(ign);
}
@@ -1344,31 +1365,11 @@ static int __init ipgre_init(void)
return -EAGAIN;
}
- ipgre_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0",
- ipgre_tunnel_setup);
- if (!ipgre_fb_tunnel_dev) {
- err = -ENOMEM;
- goto err1;
- }
-
- ipgre_fb_tunnel_dev->init = ipgre_fb_tunnel_init;
-
- if ((err = register_netdev(ipgre_fb_tunnel_dev)))
- goto err2;
-
err = register_pernet_gen_device(&ipgre_net_id, &ipgre_net_ops);
if (err < 0)
- goto err3;
-out:
+ inet_del_protocol(&ipgre_protocol, IPPROTO_GRE);
+
return err;
-err2:
- free_netdev(ipgre_fb_tunnel_dev);
-err1:
- inet_del_protocol(&ipgre_protocol, IPPROTO_GRE);
- goto out;
-err3:
- unregister_netdevice(ipgre_fb_tunnel_dev);
- goto err1;
}
static void __exit ipgre_destroy_tunnels(void)
--
1.5.3.4
--
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