diff options
| author | Martin KaFai Lau <kafai@fb.com> | 2022-08-16 23:17:11 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-08-18 17:06:12 -0700 |
| commit | 4d748f9916076399f01c259d30fe1b88abe8f622 (patch) | |
| tree | 3b4918afce96cc237e0ef6de9055e30501b3f523 /net/core/sock.c | |
| parent | fb8d784b531e363171c7e22f4f0980b4b128a607 (diff) | |
net: Add sk_setsockopt() to take the sk ptr instead of the sock ptr
A latter patch refactors bpf_setsockopt(SOL_SOCKET) with the
sock_setsockopt() to avoid code duplication and code
drift between the two duplicates.
The current sock_setsockopt() takes sock ptr as the argument.
The very first thing of this function is to get back the sk ptr
by 'sk = sock->sk'.
bpf_setsockopt() could be called when the sk does not have
the sock ptr created. Meaning sk->sk_socket is NULL. For example,
when a passive tcp connection has just been established but has yet
been accept()-ed. Thus, it cannot use the sock_setsockopt(sk->sk_socket)
or else it will pass a NULL ptr.
This patch moves all sock_setsockopt implementation to the newly
added sk_setsockopt(). The new sk_setsockopt() takes a sk ptr
and immediately gets the sock ptr by 'sock = sk->sk_socket'
The existing sock_setsockopt(sock) is changed to call
sk_setsockopt(sock->sk). All existing callers have both sock->sk
and sk->sk_socket pointer.
The latter patch will make bpf_setsockopt(SOL_SOCKET) call
sk_setsockopt(sk) directly. The bpf_setsockopt(SOL_SOCKET) does
not use the optnames that require sk->sk_socket, so it will
be safe.
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061711.4175048-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/core/sock.c')
| -rw-r--r-- | net/core/sock.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index 4cb957d934a2..20269c37ab3b 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1041,12 +1041,12 @@ static int sock_reserve_memory(struct sock *sk, int bytes) * at the socket level. Everything here is generic. */ -int sock_setsockopt(struct socket *sock, int level, int optname, - sockptr_t optval, unsigned int optlen) +static int sk_setsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, unsigned int optlen) { struct so_timestamping timestamping; + struct socket *sock = sk->sk_socket; struct sock_txtime sk_txtime; - struct sock *sk = sock->sk; int val; int valbool; struct linger ling; @@ -1499,6 +1499,13 @@ set_sndbuf: release_sock(sk); return ret; } + +int sock_setsockopt(struct socket *sock, int level, int optname, + sockptr_t optval, unsigned int optlen) +{ + return sk_setsockopt(sock->sk, level, optname, + optval, optlen); +} EXPORT_SYMBOL(sock_setsockopt); static const struct cred *sk_get_peer_cred(struct sock *sk) |