mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
bpf, cls: consolidate prog deletion path
Commit 18cdb37ebf
("net: sched: do not use tcf_proto 'tp' argument from
call_rcu") removed the last usage of tp from cls_bpf_delete_prog(), so also
remove it from the function as argument to not give a wrong impression. tp
is illegal to access from this callback, since it could already have been
freed.
Refactor the deletion code a bit, so that cls_bpf_destroy() can call into
the same code for prog deletion as cls_bpf_delete() op, instead of having
it unnecessarily duplicated.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
1afaf661b2
commit
8d829bdb97
1 changed files with 15 additions and 19 deletions
|
@ -241,7 +241,7 @@ static int cls_bpf_init(struct tcf_proto *tp)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog)
|
||||
static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
|
||||
{
|
||||
tcf_exts_destroy(&prog->exts);
|
||||
|
||||
|
@ -255,22 +255,22 @@ static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog)
|
|||
kfree(prog);
|
||||
}
|
||||
|
||||
static void __cls_bpf_delete_prog(struct rcu_head *rcu)
|
||||
static void cls_bpf_delete_prog_rcu(struct rcu_head *rcu)
|
||||
{
|
||||
struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu);
|
||||
__cls_bpf_delete_prog(container_of(rcu, struct cls_bpf_prog, rcu));
|
||||
}
|
||||
|
||||
cls_bpf_delete_prog(prog->tp, prog);
|
||||
static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog)
|
||||
{
|
||||
cls_bpf_stop_offload(tp, prog);
|
||||
list_del_rcu(&prog->link);
|
||||
tcf_unbind_filter(tp, &prog->res);
|
||||
call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu);
|
||||
}
|
||||
|
||||
static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
|
||||
{
|
||||
struct cls_bpf_prog *prog = (struct cls_bpf_prog *) arg;
|
||||
|
||||
cls_bpf_stop_offload(tp, prog);
|
||||
list_del_rcu(&prog->link);
|
||||
tcf_unbind_filter(tp, &prog->res);
|
||||
call_rcu(&prog->rcu, __cls_bpf_delete_prog);
|
||||
|
||||
__cls_bpf_delete(tp, (struct cls_bpf_prog *) arg);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -282,12 +282,8 @@ static bool cls_bpf_destroy(struct tcf_proto *tp, bool force)
|
|||
if (!force && !list_empty(&head->plist))
|
||||
return false;
|
||||
|
||||
list_for_each_entry_safe(prog, tmp, &head->plist, link) {
|
||||
cls_bpf_stop_offload(tp, prog);
|
||||
list_del_rcu(&prog->link);
|
||||
tcf_unbind_filter(tp, &prog->res);
|
||||
call_rcu(&prog->rcu, __cls_bpf_delete_prog);
|
||||
}
|
||||
list_for_each_entry_safe(prog, tmp, &head->plist, link)
|
||||
__cls_bpf_delete(tp, prog);
|
||||
|
||||
kfree_rcu(head, rcu);
|
||||
return true;
|
||||
|
@ -511,14 +507,14 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
|
|||
|
||||
ret = cls_bpf_offload(tp, prog, oldprog);
|
||||
if (ret) {
|
||||
cls_bpf_delete_prog(tp, prog);
|
||||
__cls_bpf_delete_prog(prog);
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (oldprog) {
|
||||
list_replace_rcu(&oldprog->link, &prog->link);
|
||||
tcf_unbind_filter(tp, &oldprog->res);
|
||||
call_rcu(&oldprog->rcu, __cls_bpf_delete_prog);
|
||||
call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu);
|
||||
} else {
|
||||
list_add_rcu(&prog->link, &head->plist);
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue