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net: introduce and use custom sockopt socket flag

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We will soon introduce custom setsockopt for UDP sockets, too.
Instead of doing even more complex arbitrary checks inside
sock_use_custom_sol_socket(), add a new socket flag and set it
for the relevant socket types (currently only MPTCP).

Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2022-10-20 19:48:51 +02:00 committed by David S. Miller
parent ea5ed0f00b
commit a5ef058dc4
3 changed files with 6 additions and 7 deletions
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1
include/linux/net.h
View File

@ -41,6 +41,7 @@ struct net;
#define SOCK_NOSPACE 2
#define SOCK_PASSCRED 3
#define SOCK_PASSSEC 4
#define SOCK_CUSTOM_SOCKOPT 5
#ifndef ARCH_HAS_SOCKET_TYPES
/**

4
net/mptcp/protocol.c
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@ -2708,6 +2708,8 @@ static int mptcp_init_sock(struct sock *sk)
if (ret)
return ret;
set_bit(SOCK_CUSTOM_SOCKOPT, &sk->sk_socket->flags);
/* fetch the ca name; do it outside __mptcp_init_sock(), so that clone will
* propagate the correct value
*/
@ -3684,6 +3686,8 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
struct mptcp_subflow_context *subflow;
struct sock *newsk = newsock->sk;
set_bit(SOCK_CUSTOM_SOCKOPT, &newsock->flags);
lock_sock(newsk);
/* PM/worker can now acquire the first subflow socket

8
net/socket.c
View File

@ -2199,13 +2199,7 @@ SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size,
static bool sock_use_custom_sol_socket(const struct socket *sock)
{
const struct sock *sk = sock->sk;
/* Use sock->ops->setsockopt() for MPTCP */
return IS_ENABLED(CONFIG_MPTCP) &&
sk->sk_protocol == IPPROTO_MPTCP &&
sk->sk_type == SOCK_STREAM &&
(sk->sk_family == AF_INET || sk->sk_family == AF_INET6);
return test_bit(SOCK_CUSTOM_SOCKOPT, &sock->flags);
}
/*