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Message-Id: <20210603232433.260703-5-mathew.j.martineau@linux.intel.com>
Date: Thu, 3 Jun 2021 16:24:30 -0700
From: Mat Martineau <mathew.j.martineau@...ux.intel.com>
To: netdev@...r.kernel.org
Cc: Florian Westphal <fw@...len.de>, davem@...emloft.net,
kuba@...nel.org, matthieu.baerts@...sares.net,
mptcp@...ts.linux.dev, Paolo Abeni <pabeni@...hat.com>,
Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 4/7] mptcp: setsockopt: handle SOL_SOCKET in one place only
From: Florian Westphal <fw@...len.de>
Move the pre-check to the function that handles all SOL_SOCKET values.
At this point there is complete coverage for all values that were
accepted by the pre-check.
BUSYPOLL functions are accepted but will not have any functionality
yet until its clear how the expected mptcp behaviour should look like.
Acked-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
net/mptcp/sockopt.c | 99 +++++++++++++--------------------------------
1 file changed, 29 insertions(+), 70 deletions(-)
diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c
index 3168ad4a9298..092d1f635d27 100644
--- a/net/mptcp/sockopt.c
+++ b/net/mptcp/sockopt.c
@@ -304,6 +304,14 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
return mptcp_setsockopt_sol_socket_int(msk, optname, optval, optlen);
case SO_LINGER:
return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen);
+ case SO_RCVLOWAT:
+ case SO_RCVTIMEO_OLD:
+ case SO_RCVTIMEO_NEW:
+ case SO_BUSY_POLL:
+ 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);
case SO_NO_CHECK:
case SO_DONTROUTE:
case SO_BROADCAST:
@@ -317,7 +325,24 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
return 0;
}
- return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);
+ /* SO_OOBINLINE is not supported, let's avoid the related mess
+ * SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF,
+ * SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER,
+ * we must be careful with subflows
+ *
+ * SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks
+ * explicitly the sk_protocol field
+ *
+ * SO_PEEK_OFF is unsupported, as it is for plain TCP
+ * SO_MAX_PACING_RATE is unsupported, we must be careful with subflows
+ * SO_CNX_ADVICE is currently unsupported, could possibly be relevant,
+ * but likely needs careful design
+ *
+ * SO_ZEROCOPY is currently unsupported, TODO in sndmsg
+ * SO_TXTIME is currently unsupported
+ */
+
+ return -EOPNOTSUPP;
}
static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
@@ -349,72 +374,6 @@ static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
static bool mptcp_supported_sockopt(int level, int optname)
{
- if (level == SOL_SOCKET) {
- switch (optname) {
- case SO_DEBUG:
- case SO_REUSEPORT:
- case SO_REUSEADDR:
-
- /* the following ones need a better implementation,
- * but are quite common we want to preserve them
- */
- case SO_BINDTODEVICE:
- case SO_SNDBUF:
- case SO_SNDBUFFORCE:
- case SO_RCVBUF:
- case SO_RCVBUFFORCE:
- case SO_KEEPALIVE:
- case SO_PRIORITY:
- case SO_LINGER:
- case SO_TIMESTAMP_OLD:
- case SO_TIMESTAMP_NEW:
- case SO_TIMESTAMPNS_OLD:
- case SO_TIMESTAMPNS_NEW:
- case SO_TIMESTAMPING_OLD:
- case SO_TIMESTAMPING_NEW:
- case SO_RCVLOWAT:
- case SO_RCVTIMEO_OLD:
- case SO_RCVTIMEO_NEW:
- case SO_SNDTIMEO_OLD:
- case SO_SNDTIMEO_NEW:
- case SO_MARK:
- case SO_INCOMING_CPU:
- case SO_BINDTOIFINDEX:
- case SO_BUSY_POLL:
- case SO_PREFER_BUSY_POLL:
- case SO_BUSY_POLL_BUDGET:
-
- /* next ones are no-op for plain TCP */
- case SO_NO_CHECK:
- case SO_DONTROUTE:
- case SO_BROADCAST:
- case SO_BSDCOMPAT:
- case SO_PASSCRED:
- case SO_PASSSEC:
- case SO_RXQ_OVFL:
- case SO_WIFI_STATUS:
- case SO_NOFCS:
- case SO_SELECT_ERR_QUEUE:
- return true;
- }
-
- /* SO_OOBINLINE is not supported, let's avoid the related mess */
- /* SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF,
- * SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER,
- * we must be careful with subflows
- */
- /* SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks
- * explicitly the sk_protocol field
- */
- /* SO_PEEK_OFF is unsupported, as it is for plain TCP */
- /* SO_MAX_PACING_RATE is unsupported, we must be careful with subflows */
- /* SO_CNX_ADVICE is currently unsupported, could possibly be relevant,
- * but likely needs careful design
- */
- /* SO_ZEROCOPY is currently unsupported, TODO in sndmsg */
- /* SO_TXTIME is currently unsupported */
- return false;
- }
if (level == SOL_IP) {
switch (optname) {
/* should work fine */
@@ -624,12 +583,12 @@ int mptcp_setsockopt(struct sock *sk, int level, int optname,
pr_debug("msk=%p", msk);
- if (!mptcp_supported_sockopt(level, optname))
- return -ENOPROTOOPT;
-
if (level == SOL_SOCKET)
return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen);
+ if (!mptcp_supported_sockopt(level, optname))
+ return -ENOPROTOOPT;
+
/* @@ the meaning of setsockopt() when the socket is connected and
* there are multiple subflows is not yet defined. It is up to the
* MPTCP-level socket to configure the subflows until the subflow
--
2.31.1
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