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bpf: refactor bpf_prog_get and type check into helper

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Since bpf_prog_get() and program type check is used in a couple of places,
refactor this into a small helper function that we can make use of. Since
the non RO prog->aux part is not used in performance critical paths and a
program destruction via RCU is rather very unlikley when doing the put, we
shouldn't have an issue just doing the bpf_prog_get() + prog->type != type
check, but actually not taking the ref at all (due to being in fdget() /
fdput() section of the bpf fd) is even cleaner and makes the diff smaller
as well, so just go for that. Callsites are changed to make use of the new
helper where possible.

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:
Daniel Borkmann 2016-06-30 17:24:44 +02:00 • committed by David S. Miller
parent 1aacde3d22
commit 113214be7f
7 changed files with 31 additions and 44 deletions
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13
net/core/filter.c
View file

@ -1301,21 +1301,10 @@ int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
{
struct bpf_prog *prog;
if (sock_flag(sk, SOCK_FILTER_LOCKED))
return ERR_PTR(-EPERM);
prog = bpf_prog_get(ufd);
if (IS_ERR(prog))
return prog;
if (prog->type != BPF_PROG_TYPE_SOCKET_FILTER) {
bpf_prog_put(prog);
return ERR_PTR(-EINVAL);
}
return prog;
return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
}
int sk_attach_bpf(u32 ufd, struct sock *sk)