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net_sched: use tcf_queue_work() in bpf filter 

Defer the tcf_exts_destroy() in RCU callback to
tc filter workqueue and get RTNL lock.

Reported-by: Chris Mi <chrism@mellanox.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2017-10-26 18:24:30 -07:00 committed by David S. Miller
parent c96a48385d
commit e910af676b
1 changed files with 17 additions and 2 deletions
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17
net/sched/cls_bpf.c
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@ -49,7 +49,10 @@ struct cls_bpf_prog {
struct sock_filter *bpf_ops; struct sock_filter *bpf_ops;
const char *bpf_name; const char *bpf_name;
struct tcf_proto *tp; struct tcf_proto *tp;
union {
struct work_struct work;
struct rcu_head rcu; struct rcu_head rcu;
};
}; };
static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
@ -257,9 +260,21 @@ static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
kfree(prog); kfree(prog);
} }
static void cls_bpf_delete_prog_work(struct work_struct *work)
{
struct cls_bpf_prog *prog = container_of(work, struct cls_bpf_prog, work);
rtnl_lock();
__cls_bpf_delete_prog(prog);
rtnl_unlock();
}
static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu) static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu)
{ {
__cls_bpf_delete_prog(container_of(rcu, struct cls_bpf_prog, rcu)); struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu);
INIT_WORK(&prog->work, cls_bpf_delete_prog_work);
tcf_queue_work(&prog->work);
} }
static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog) static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog)