From db44575f6fd55df6ff67ddd21f7ad5be5a741136 Mon Sep 17 00:00:00 2001 From: Alexey Kuznetsov Date: Sat, 30 Jul 2005 17:46:44 -0700 Subject: [PATCH] [NET]: fix oops after tunnel module unload Tunnel modules used to obtain module refcount each time when some tunnel was created, which meaned that tunnel could be unloaded only after all the tunnels are deleted. Since killing old MOD_*_USE_COUNT macros this protection has gone. It is possible to return it back as module_get/put, but it looks more natural and practically useful to force destruction of all the child tunnels on module unload. Signed-off-by: Alexey Kuznetsov Signed-off-by: David S. Miller --- net/ipv4/ip_gre.c | 21 ++++++++++++++++++--- net/ipv4/ipip.c | 20 ++++++++++++++++++-- net/ipv6/sit.c | 21 +++++++++++++++++++-- 3 files changed, 55 insertions(+), 7 deletions(-) diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 884835522224..f0d5740d7e22 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -290,7 +290,6 @@ static struct ip_tunnel * ipgre_tunnel_locate(struct ip_tunnel_parm *parms, int dev_hold(dev); ipgre_tunnel_link(nt); - /* Do not decrement MOD_USE_COUNT here. */ return nt; failed: @@ -1277,12 +1276,28 @@ err1: goto out; } -static void ipgre_fini(void) +static void __exit ipgre_destroy_tunnels(void) +{ + int prio; + + for (prio = 0; prio < 4; prio++) { + int h; + for (h = 0; h < HASH_SIZE; h++) { + struct ip_tunnel *t; + while ((t = tunnels[prio][h]) != NULL) + unregister_netdevice(t->dev); + } + } +} + +static void __exit ipgre_fini(void) { if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) printk(KERN_INFO "ipgre close: can't remove protocol\n"); - unregister_netdev(ipgre_fb_tunnel_dev); + rtnl_lock(); + ipgre_destroy_tunnels(); + rtnl_unlock(); } module_init(ipgre_init); diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c index c3947cd566b7..c05c1df0bb04 100644 --- a/net/ipv4/ipip.c +++ b/net/ipv4/ipip.c @@ -255,7 +255,6 @@ static struct ip_tunnel * ipip_tunnel_locate(struct ip_tunnel_parm *parms, int c dev_hold(dev); ipip_tunnel_link(nt); - /* Do not decrement MOD_USE_COUNT here. */ return nt; failed: @@ -920,12 +919,29 @@ static int __init ipip_init(void) goto out; } +static void __exit ipip_destroy_tunnels(void) +{ + int prio; + + for (prio = 1; prio < 4; prio++) { + int h; + for (h = 0; h < HASH_SIZE; h++) { + struct ip_tunnel *t; + while ((t = tunnels[prio][h]) != NULL) + unregister_netdevice(t->dev); + } + } +} + static void __exit ipip_fini(void) { if (ipip_unregister() < 0) printk(KERN_INFO "ipip close: can't deregister tunnel\n"); - unregister_netdev(ipip_fb_tunnel_dev); + rtnl_lock(); + ipip_destroy_tunnels(); + unregister_netdevice(ipip_fb_tunnel_dev); + rtnl_unlock(); } module_init(ipip_init); diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index b788f55e139b..e553e5b80d6e 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -195,7 +195,6 @@ static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int dev_hold(dev); ipip6_tunnel_link(nt); - /* Do not decrement MOD_USE_COUNT here. */ return nt; failed: @@ -794,10 +793,28 @@ static struct net_protocol sit_protocol = { .err_handler = ipip6_err, }; +static void __exit sit_destroy_tunnels(void) +{ + int prio; + + for (prio = 1; prio < 4; prio++) { + int h; + for (h = 0; h < HASH_SIZE; h++) { + struct ip_tunnel *t; + while ((t = tunnels[prio][h]) != NULL) + unregister_netdevice(t->dev); + } + } +} + void __exit sit_cleanup(void) { inet_del_protocol(&sit_protocol, IPPROTO_IPV6); - unregister_netdev(ipip6_fb_tunnel_dev); + + rtnl_lock(); + sit_destroy_tunnels(); + unregister_netdevice(ipip6_fb_tunnel_dev); + rtnl_unlock(); } int __init sit_init(void) -- 2.30.2