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Date: Tue, 26 Jul 2022 23:09:02 -0700
From: Martin KaFai Lau <kafai@...com>
To: <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
CC: Alexei Starovoitov <ast@...nel.org>,
Andrii Nakryiko <andrii@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
David Miller <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, <kernel-team@...com>,
Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH bpf-next 01/14] net: Change sock_setsockopt from taking sock ptr to sk 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
a userspace owner. Meaning sk->sk_socket is NULL. For example,
when a passive tcp connection has just been established. Thus,
it cannot use the sock_setsockopt(sk->sk_socket) or else it will
pass a NULL sock ptr.
All existing callers have both sock->sk and sk->sk_socket pointer.
Thus, this patch changes the sock_setsockopt() to take a sk ptr
instead of the sock ptr. The bpf_setsockopt() only allows
optnames that do not require a sock ptr.
Signed-off-by: Martin KaFai Lau <kafai@...com>
---
drivers/nvme/host/tcp.c | 2 +-
fs/ksmbd/transport_tcp.c | 2 +-
include/net/sock.h | 2 +-
net/core/sock.c | 4 ++--
net/mptcp/sockopt.c | 12 ++++++------
net/socket.c | 2 +-
6 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 7a9e6ffa2342..60e14cc39e49 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1555,7 +1555,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
char *iface = nctrl->opts->host_iface;
sockptr_t optval = KERNEL_SOCKPTR(iface);
- ret = sock_setsockopt(queue->sock, SOL_SOCKET, SO_BINDTODEVICE,
+ ret = sock_setsockopt(queue->sock->sk, SOL_SOCKET, SO_BINDTODEVICE,
optval, strlen(iface));
if (ret) {
dev_err(nctrl->device,
diff --git a/fs/ksmbd/transport_tcp.c b/fs/ksmbd/transport_tcp.c
index 143bba4e4db8..982eed2dd575 100644
--- a/fs/ksmbd/transport_tcp.c
+++ b/fs/ksmbd/transport_tcp.c
@@ -420,7 +420,7 @@ static int create_socket(struct interface *iface)
ksmbd_tcp_nodelay(ksmbd_socket);
ksmbd_tcp_reuseaddr(ksmbd_socket);
- ret = sock_setsockopt(ksmbd_socket,
+ ret = sock_setsockopt(ksmbd_socket->sk,
SOL_SOCKET,
SO_BINDTODEVICE,
KERNEL_SOCKPTR(iface->name),
diff --git a/include/net/sock.h b/include/net/sock.h
index f7ad1a7705e9..9e2539dcc293 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1795,7 +1795,7 @@ void sock_pfree(struct sk_buff *skb);
#define sock_edemux sock_efree
#endif
-int sock_setsockopt(struct socket *sock, int level, int op,
+int sock_setsockopt(struct sock *sk, int level, int op,
sockptr_t optval, unsigned int optlen);
int sock_getsockopt(struct socket *sock, int level, int op,
diff --git a/net/core/sock.c b/net/core/sock.c
index 4cb957d934a2..18bb4f269cf1 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,
+int sock_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;
diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 423d3826ca1e..5684499b4d39 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -124,7 +124,7 @@ static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val)
struct sock *sk = (struct sock *)msk;
int ret;
- ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
+ ret = sock_setsockopt(sk, SOL_SOCKET, optname,
optval, sizeof(val));
if (ret)
return ret;
@@ -149,7 +149,7 @@ static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optnam
struct sock *sk = (struct sock *)msk;
int ret;
- ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
+ ret = sock_setsockopt(sk, SOL_SOCKET, optname,
optval, sizeof(val));
if (ret)
return ret;
@@ -225,7 +225,7 @@ static int mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk,
return -EINVAL;
}
- ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
+ ret = sock_setsockopt(sk, SOL_SOCKET, optname,
KERNEL_SOCKPTR(×tamping),
sizeof(timestamping));
if (ret)
@@ -262,7 +262,7 @@ static int mptcp_setsockopt_sol_socket_linger(struct mptcp_sock *msk, sockptr_t
return -EFAULT;
kopt = KERNEL_SOCKPTR(&ling);
- ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, SO_LINGER, kopt, sizeof(ling));
+ ret = sock_setsockopt(sk, SOL_SOCKET, SO_LINGER, kopt, sizeof(ling));
if (ret)
return ret;
@@ -306,7 +306,7 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
return -EINVAL;
}
- ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen);
+ ret = sock_setsockopt(ssock->sk, SOL_SOCKET, optname, optval, optlen);
if (ret == 0) {
if (optname == SO_REUSEPORT)
sk->sk_reuseport = ssock->sk->sk_reuseport;
@@ -349,7 +349,7 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
case SO_PREFER_BUSY_POLL:
case SO_BUSY_POLL_BUDGET:
/* No need to copy: only relevant for msk */
- return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);
+ return sock_setsockopt(sk, SOL_SOCKET, optname, optval, optlen);
case SO_NO_CHECK:
case SO_DONTROUTE:
case SO_BROADCAST:
diff --git a/net/socket.c b/net/socket.c
index b6bd4cf44d3f..c6911d613ae2 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2245,7 +2245,7 @@ int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval,
if (kernel_optval)
optval = KERNEL_SOCKPTR(kernel_optval);
if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
- err = sock_setsockopt(sock, level, optname, optval, optlen);
+ err = sock_setsockopt(sock->sk, level, optname, optval, optlen);
else if (unlikely(!sock->ops->setsockopt))
err = -EOPNOTSUPP;
else
--
2.30.2
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