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af_packet: preserve const qualifier in pkt_sk()

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We can change pkt_sk() to propagate const qualifier of its argument,
thanks to container_of_const()

This should avoid some potential errors caused by accidental
(const -> not_const) promotion.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-03-17 15:55:31 +00:00 committed by David S. Miller
parent 94c540fbfc
commit 68ac9a8b6e
1 changed files with 1 additions and 4 deletions
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5
net/packet/internal.h
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@ -133,10 +133,7 @@ struct packet_sock {
atomic_t tp_drops ____cacheline_aligned_in_smp;
};
static inline struct packet_sock *pkt_sk(struct sock *sk)
{
return (struct packet_sock *)sk;
}
#define pkt_sk(ptr) container_of_const(ptr, struct packet_sock, sk)
enum packet_sock_flags {
PACKET_SOCK_ORIGDEV,