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From ae56e27e30122f82d244f9eb35fcab8fa60e0d31 Mon Sep 17 00:00:00 2001
From: Chen Minqiang <ptpt52@gmail.com>
Date: Sun, 29 Apr 2018 14:08:57 +0800
Subject: [PATCH] cleanup offload hooks on netdev unregister
This should fix crashdump on reboot when FLOWOFFLOAD enabled
kmsg:
[ 84.188081] Workqueue: events_power_efficient xt_flowoffload_hook_work [xt_FLOWOFFLOAD]
[ 84.209326] task: ffff88000ecd0c80 task.stack: ffffc90000068000
[ 84.224706] RIP: 0010:__nf_unregister_net_hook+0x1/0x90
[ 84.242911] RSP: 0018:ffffc9000006be30 EFLAGS: 00010202
[ 84.257405] RAX: 0000000000000000 RBX: ffff88000c5b3228 RCX: 0000000100170001
[ 84.292175] RDX: ffff88000ecd0c80 RSI: ffff88000c5b3228 RDI: 6b6b6b6b6b6b6b6b
[ 84.305095] RBP: ffffc9000006be58 R08: ffff88000c5b3578 R09: ffff88000c5b3538
[ 84.325980] R10: ffffc9000006be50 R11: ffff88000fc1f310 R12: ffffffff81e6c580
[ 84.396514] R13: ffff88000d1723d0 R14: ffff88000ec0fc00 R15: 0000000000000000
[ 84.459500] FS: 0000000000000000(0000) GS:ffff88000fc00000(0000) knlGS:0000000000000000
[ 84.525121] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 84.565460] CR2: 0000000000a931d8 CR3: 0000000001e08006 CR4: 00000000000606f0
[ 84.638311] Call Trace:
[ 84.655229] ? nf_unregister_net_hook+0x88/0xd0
[ 84.706898] xt_flowoffload_hook_work+0x12a/0x17a [xt_FLOWOFFLOAD]
[ 84.765504] process_one_work+0x1c4/0x310
[ 84.799558] worker_thread+0x20b/0x3c0
[ 84.850119] kthread+0x112/0x120
[ 84.884839] ? process_one_work+0x310/0x310
[ 84.923571] ? kthread_create_on_node+0x40/0x40
[ 84.966100] ret_from_fork+0x35/0x40
[ 84.981738] Code: 41 5c 41 5d 41 5e 41 5f 5d c3 48 8b 05 c1 f1 99 00 55 48 89 e5 48 85 c0 75 02 0f 0b e8 b9 f6 30 00 5d c3 0f 1f 80 00 00 00 00 55 <0f> b7 0f 48 89 e5 48 89 c8 48 c1 e0 04 48 8d 54 07 08 31 c0 eb
[ 85.100453] RIP: __nf_unregister_net_hook+0x1/0x90 RSP: ffffc9000006be30
[ 85.111658] ---[ end trace 5c25a390045cac75 ]---
[ 85.124535] Kernel panic - not syncing: Fatal exception
Signed-off-by: Chen Minqiang <ptpt52@gmail.com>
---
net/netfilter/xt_FLOWOFFLOAD.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
--- a/net/netfilter/xt_FLOWOFFLOAD.c
+++ b/net/netfilter/xt_FLOWOFFLOAD.c
@@ -337,10 +337,41 @@ static void xt_flowoffload_table_cleanup
nf_flow_table_free(table);
}
+static int flow_offload_netdev_event(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct xt_flowoffload_hook *hook = NULL;
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+ if (event != NETDEV_UNREGISTER)
+ return NOTIFY_DONE;
+
+ spin_lock_bh(&hooks_lock);
+ hook = flow_offload_lookup_hook(dev);
+ if (hook) {
+ hlist_del(&hook->list);
+ }
+ spin_unlock_bh(&hooks_lock);
+ if (hook) {
+ nf_unregister_net_hook(hook->net, &hook->ops);
+ kfree(hook);
+ }
+
+ nf_flow_table_cleanup(dev_net(dev), dev);
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block flow_offload_netdev_notifier = {
+ .notifier_call = flow_offload_netdev_event,
+};
+
static int __init xt_flowoffload_tg_init(void)
{
int ret;
+ register_netdevice_notifier(&flow_offload_netdev_notifier);
+
INIT_DELAYED_WORK(&hook_work, xt_flowoffload_hook_work);
ret = xt_flowoffload_table_init(&nf_flowtable);
@@ -358,6 +389,7 @@ static void __exit xt_flowoffload_tg_exi
{
xt_unregister_target(&offload_tg_reg);
xt_flowoffload_table_cleanup(&nf_flowtable);
+ unregister_netdevice_notifier(&flow_offload_netdev_notifier);
}
MODULE_LICENSE("GPL");
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