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flow_dissector: Pull BPF program assignment up to bpf-netns

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Prepare for using bpf_prog_array to store attached programs by moving out
code that updates the attached program out of flow dissector.

Managing bpf_prog_array is more involved than updating a single bpf_prog
pointer. This will let us do it all from one place, bpf/net_namespace.c, in
the subsequent patch.

No functional change intended.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200625141357.910330-2-jakub@cloudflare.com
This commit is contained in:
Jakub Sitnicki
2020-06-25 16:13:54 +02:00
committed by Alexei Starovoitov
parent 517bbe1994
commit 3b7016996c
3 changed files with 22 additions and 14 deletions
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13
net/core/flow_dissector.c
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@@ -70,10 +70,10 @@ void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
EXPORT_SYMBOL(skb_flow_dissector_init);
#ifdef CONFIG_BPF_SYSCALL
int flow_dissector_bpf_prog_attach(struct net *net, struct bpf_prog *prog)
int flow_dissector_bpf_prog_attach_check(struct net *net,
struct bpf_prog *prog)
{
enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
struct bpf_prog *attached;
if (net == &init_net) {
/* BPF flow dissector in the root namespace overrides
@@ -97,15 +97,6 @@ int flow_dissector_bpf_prog_attach(struct net *net, struct bpf_prog *prog)
return -EEXIST;
}
attached = rcu_dereference_protected(net->bpf.progs[type],
lockdep_is_held(&netns_bpf_mutex));
if (attached == prog)
/* The same program cannot be attached twice */
return -EINVAL;
rcu_assign_pointer(net->bpf.progs[type], prog);
if (attached)
bpf_prog_put(attached);
return 0;
}
#endif /* CONFIG_BPF_SYSCALL */