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From: Dmytro Shytyi <dmytro@shytyi.net>
To: mptcp@lists.linux.dev
Cc: Dmytro Shytyi <dmytro@shytyi.net>
Subject: [RFC PATCH mptcp-next v6 2/9] Initiator: MSG_FASTOPEN sendto(). request cookie
Date: Fri, 16 Sep 2022 01:55:57 +0200	[thread overview]
Message-ID: <20220915235604.26018-3-dmytro@shytyi.net> (raw)
In-Reply-To: <20220915235604.26018-1-dmytro@shytyi.net>

Initiator: MSG_FASTOPEN in sendto triggers the mptcp_sendsmg_fastopen.
It requests a MPTFO cookie. 
Suggestion @palbeni(JAN 17): 'split the patch in several small one'.

Signed-off-by: Dmytro Shytyi <dmytro@shytyi.net>
---
 net/mptcp/fastopen.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
 net/mptcp/protocol.c |  4 ++--
 net/mptcp/protocol.h |  6 ++++++
 3 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/net/mptcp/fastopen.c b/net/mptcp/fastopen.c
index 0c9ef6f5d528..9974508e0f4c 100644
--- a/net/mptcp/fastopen.c
+++ b/net/mptcp/fastopen.c
@@ -3,3 +3,53 @@
  */
 
 #include "protocol.h"
+
+int mptcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg,
+			   size_t len, struct mptcp_sock *msk,
+			   size_t *copied)
+{
+	const struct iphdr *iph;
+	struct ubuf_info *uarg;
+	struct sockaddr *uaddr;
+	struct sk_buff *skb;
+	struct tcp_sock *tp;
+	struct socket *ssk;
+	int ret;
+
+	ssk = __mptcp_nmpc_socket(msk);
+	if (unlikely(!ssk))
+		goto out_EFAULT;
+	skb = tcp_stream_alloc_skb(ssk->sk, 0, ssk->sk->sk_allocation, true);
+	if (unlikely(!skb))
+		goto out_EFAULT;
+	iph = ip_hdr(skb);
+	if (unlikely(!iph))
+		goto out_EFAULT;
+	uarg = msg_zerocopy_realloc(sk, len, skb_zcopy(skb));
+	if (unlikely(!uarg))
+		goto out_EFAULT;
+	uaddr = msg->msg_name;
+
+	tp = tcp_sk(ssk->sk);
+	if (unlikely(!tp))
+		goto out_EFAULT;
+	if (!tp->fastopen_req)
+		tp->fastopen_req = kzalloc(sizeof(*tp->fastopen_req),
+					   ssk->sk->sk_allocation);
+
+	if (unlikely(!tp->fastopen_req))
+		goto out_EFAULT;
+	tp->fastopen_req->data = msg;
+	tp->fastopen_req->size = len;
+	tp->fastopen_req->uarg = uarg;
+
+	/* requests a cookie */
+	ret = mptcp_stream_connect(sk->sk_socket, uaddr,
+				   msg->msg_namelen, msg->msg_flags);
+	if (!ret)
+		*copied = len;
+	return ret;
+out_EFAULT:
+	ret = -EFAULT;
+	return ret;
+}
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 55442df8fb97..6bbf1b86465d 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1672,9 +1672,9 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	int ret = 0;
 	long timeo;
 
-	/* we don't support FASTOPEN yet */
+	/* we don't fully support FASTOPEN yet */
 	if (msg->msg_flags & MSG_FASTOPEN)
-		return -EOPNOTSUPP;
+		ret = mptcp_sendmsg_fastopen(sk, msg, len, msk, &copied);
 
 	/* silently ignore everything else */
 	msg->msg_flags &= MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL;
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 1bc9f6e77ddd..ad51910f1cc9 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -836,6 +836,12 @@ void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_
 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk);
 
+// Fast Open Mechanism functions begin
+int mptcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg,
+			   size_t len, struct mptcp_sock *msk,
+			   size_t *copied);
+// Fast Open Mechanism functions end
+
 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
 {
 	return READ_ONCE(msk->pm.addr_signal) &
-- 
2.25.1



  parent reply	other threads:[~2022-09-15 23:56 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-15 23:55 [RFC PATCH mptcp-next v6 0/9] mptcp: Fast Open Mechanism Dmytro Shytyi
2022-09-15 23:55 ` [RFC PATCH mptcp-next v6 1/9] Add separate fastopen.c file Dmytro Shytyi
2022-09-15 23:55 ` Dmytro Shytyi [this message]
2022-09-15 23:55 ` [RFC PATCH mptcp-next v6 3/9] rfree(), rmem_uncharge() prototypes to protocol.h Dmytro Shytyi
2022-09-15 23:55 ` [RFC PATCH mptcp-next v6 4/9] Initiator: add locks() to mptcp_sendmsg_fastopen Dmytro Shytyi
2022-09-15 23:56 ` [RFC PATCH mptcp-next v6 5/9] Fix unxpctd val of subflow->map_seq(dscrd packet) Dmytro Shytyi
2022-09-15 23:56 ` [RFC PATCH mptcp-next v6 6/9] mptfo variables for msk, options. Fix loop retrans Dmytro Shytyi
2022-09-15 23:56 ` [RFC PATCH mptcp-next v6 7/9] Listener: Add received skb to msk Dmytro Shytyi
2022-09-15 23:56 ` [RFC PATCH mptcp-next v6 8/9] mptcp_fastopen_add_skb() helpers (skb to msk) Dmytro Shytyi
2022-09-15 23:56 ` [RFC PATCH mptcp-next v6 9/9] selftests: mptfo initiator/listener Dmytro Shytyi
2022-09-16  1:35   ` selftests: mptfo initiator/listener: Build Failure MPTCP CI

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