提交 8d829bdb 编写于 作者: D Daniel Borkmann 提交者: David S. Miller

bpf, cls: consolidate prog deletion path

Commit 18cdb37e ("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: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 1afaf661
......@@ -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(prog->tp, prog);
__cls_bpf_delete_prog(container_of(rcu, struct cls_bpf_prog, rcu));
}
static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog)
{
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);
call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu);
}
static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
{
__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);
}
......
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