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From: Martin KaFai Lau <kafai@fb.com>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	David Miller <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, <kernel-team@fb.com>,
	Paolo Abeni <pabeni@redhat.com>,
	Martin KaFai Lau <martin.lau@kernel.org>
Subject: [PATCH v2 bpf-next 01/17] net: Change sock_getsockopt() to take the sk ptr instead of the sock ptr
Date: Thu, 1 Sep 2022 17:27:56 -0700	[thread overview]
Message-ID: <20220902002756.2887884-1-kafai@fb.com> (raw)
In-Reply-To: <20220902002750.2887415-1-kafai@fb.com>

From: Martin KaFai Lau <martin.lau@kernel.org>

A latter patch refactors bpf_getsockopt(SOL_SOCKET) with the
sock_getsockopt() to avoid code duplication and code
drift between the two duplicates.

The current sock_getsockopt() 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_getsockopt() 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_getsockopt(sk->sk_socket)
or else it will pass a NULL ptr.

This patch moves all sock_getsockopt implementation to the newly
added sk_getsockopt().  The new sk_getsockopt() takes a sk ptr
and immediately gets the sock ptr by 'sock = sk->sk_socket'

The existing sock_getsockopt(sock) is changed to call
sk_getsockopt(sock->sk).  All existing callers have both sock->sk
and sk->sk_socket pointer.

The latter patch will make bpf_getsockopt(SOL_SOCKET) call
sk_getsockopt(sk) directly.  The bpf_getsockopt(SOL_SOCKET) does
not use the optnames that require sk->sk_socket, so it will
be safe.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
---
 net/core/sock.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index 2a6f84702eb9..21bc4bf6b485 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1580,10 +1580,10 @@ static int groups_to_user(gid_t __user *dst, const struct group_info *src)
 	return 0;
 }
 
-int sock_getsockopt(struct socket *sock, int level, int optname,
-		    char __user *optval, int __user *optlen)
+static int sk_getsockopt(struct sock *sk, int level, int optname,
+			 char __user *optval, int __user *optlen)
 {
-	struct sock *sk = sock->sk;
+	struct socket *sock = sk->sk_socket;
 
 	union {
 		int val;
@@ -1947,6 +1947,12 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
 	return 0;
 }
 
+int sock_getsockopt(struct socket *sock, int level, int optname,
+		    char __user *optval, int __user *optlen)
+{
+	return sk_getsockopt(sock->sk, level, optname, optval, optlen);
+}
+
 /*
  * Initialize an sk_lock.
  *
-- 
2.30.2


  reply	other threads:[~2022-09-02  0:30 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-02  0:27 [PATCH v2 bpf-next 00/17] bpf: net: Remove duplicated code from bpf_getsockopt() Martin KaFai Lau
2022-09-02  0:27 ` Martin KaFai Lau [this message]
2022-09-02  0:28 ` [PATCH v2 bpf-next 02/17] bpf: net: Change sk_getsockopt() to take the sockptr_t argument Martin KaFai Lau
2022-09-02  0:28 ` [PATCH v2 bpf-next 03/17] bpf: net: Avoid sk_getsockopt() taking sk lock when called from bpf Martin KaFai Lau
2022-09-02  0:28 ` [PATCH v2 bpf-next 04/17] bpf: net: Change do_tcp_getsockopt() to take the sockptr_t argument Martin KaFai Lau
2022-09-02  0:28 ` [PATCH v2 bpf-next 05/17] bpf: net: Avoid do_tcp_getsockopt() taking sk lock when called from bpf Martin KaFai Lau
2022-09-02  0:28 ` [PATCH v2 bpf-next 06/17] bpf: net: Change do_ip_getsockopt() to take the sockptr_t argument Martin KaFai Lau
2022-09-02  0:28 ` [PATCH v2 bpf-next 07/17] bpf: net: Avoid do_ip_getsockopt() taking sk lock when called from bpf Martin KaFai Lau
2022-09-02  0:28 ` [PATCH v2 bpf-next 08/17] net: Remove unused flags argument from do_ipv6_getsockopt Martin KaFai Lau
2022-09-02  0:28 ` [PATCH v2 bpf-next 09/17] net: Add a len argument to compat_ipv6_get_msfilter() Martin KaFai Lau
2022-09-02  0:28 ` [PATCH v2 bpf-next 10/17] bpf: net: Change do_ipv6_getsockopt() to take the sockptr_t argument Martin KaFai Lau
2022-09-02  0:28 ` [PATCH v2 bpf-next 11/17] bpf: net: Avoid do_ipv6_getsockopt() taking sk lock when called from bpf Martin KaFai Lau
2022-09-02  0:29 ` [PATCH v2 bpf-next 12/17] bpf: Embed kernel CONFIG check into the if statement in bpf_getsockopt Martin KaFai Lau
2022-09-02  0:29 ` [PATCH v2 bpf-next 13/17] bpf: Change bpf_getsockopt(SOL_SOCKET) to reuse sk_getsockopt() Martin KaFai Lau
2022-09-02  0:29 ` [PATCH v2 bpf-next 14/17] bpf: Change bpf_getsockopt(SOL_TCP) to reuse do_tcp_getsockopt() Martin KaFai Lau
2022-09-02  0:29 ` [PATCH v2 bpf-next 15/17] bpf: Change bpf_getsockopt(SOL_IP) to reuse do_ip_getsockopt() Martin KaFai Lau
2022-09-02  0:29 ` [PATCH v2 bpf-next 16/17] bpf: Change bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt() Martin KaFai Lau
2022-09-02  0:29 ` [PATCH v2 bpf-next 17/17] selftest/bpf: Add test for bpf_getsockopt() Martin KaFai Lau
2022-09-02 22:16 ` [PATCH v2 bpf-next 00/17] bpf: net: Remove duplicated code from bpf_getsockopt() sdf
2022-09-03  3:50 ` patchwork-bot+netdevbpf

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