From: Hannes Reinecke <hare@suse.de>
To: Sagi Grimberg <sagi@grimberg.me>, Jakub Kicinski <kuba@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>, Keith Busch <kbusch@kernel.org>,
linux-nvme@lists.infradead.org,
Chuck Lever <chuck.lever@oracle.com>,
kernel-tls-handshake@lists.linux.dev
Subject: Re: [PATCH 07/18] net/tls: sanitize MSG_EOR handling
Date: Tue, 18 Apr 2023 12:39:54 +0200 [thread overview]
Message-ID: <b313144b-f510-f3d5-6066-6123c27039ed@suse.de> (raw)
In-Reply-To: <db39fd2d-6da2-852e-70aa-7499fedf8b48@suse.de>
On 4/18/23 12:24, Hannes Reinecke wrote:
> On 4/18/23 12:07, Sagi Grimberg wrote:
>>
>>>>> The TLS stack is using MSG_EOR internally, so the flag cannot be
>>>>> set for sendmsg()/sendpage(). But to avoid having the caller to
>>>>> check whether TLS is active modify the code to clear the MSG_EOR
>>>>> flag. And blank out MSG_MORE / MSG_SENDPAGE_NOTLAST, too, as they
>>>>> conflict with MSG_EOR anyway.
>>>>
>>>> This looks like a temporary workaround to me.
>>>>
>>>> The networking folks really need to be CC'd on this (same for patch 6).
>>>
>>> Thanks, when I said "we can support EOR" I obviously meant support
>>> not ignore it :( No ack.
>>
>> Obviously neither Hannes or I have sufficient tls knowledge to properly
>> support it... It needs to be done by someone who knows the
>> implementation.
>>
>> Is this a large scope to add support for it? Because if it is, I'd
>> simply change nvme to clear MSG_EOR when tls is used (despite my
>> preference to not do special things for tls).
>
> There's a rather simple patch for tls_sw. It already paces the data
> internally by an 'eor' variable, which is currently set to !MSG_MORE.
> So evaluating MSG_EOR here is really trivial, and doesn't seem to cause
> any issues.
>
> Or, at least, none which would show up with NVMe-over-TLS :-)
>
Suggestion is to change it like this (sendpage follows suit):
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 827292e29f99..7b28b11ff611 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -953,9 +953,12 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr
*msg, size_t size)
int pending;
if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL |
- MSG_CMSG_COMPAT))
+ MSG_EOR | MSG_CMSG_COMPAT))
return -EOPNOTSUPP;
+ if (MSG_EOR)
+ eor = true;
+
ret = mutex_lock_interruptible(&tls_ctx->tx_lock);
if (ret)
return ret;
Cheers,
Hannes
next prev parent reply other threads:[~2023-04-18 10:39 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-17 13:02 [PATCHv3 00/18] nvme: In-kernel TLS support for TCP Hannes Reinecke
2023-04-17 13:02 ` [PATCH 01/18] nvme-keyring: register '.nvme' keyring Hannes Reinecke
2023-04-17 13:02 ` [PATCH 02/18] nvme-keyring: define a 'psk' keytype Hannes Reinecke
2023-04-17 13:02 ` [PATCH 03/18] nvme: add TCP TSAS definitions Hannes Reinecke
2023-04-17 13:02 ` [PATCH 04/18] nvme-tcp: add definitions for TLS cipher suites Hannes Reinecke
2023-04-17 13:02 ` [PATCH 05/18] nvme-keyring: implement nvme_tls_psk_default() Hannes Reinecke
2023-04-17 13:02 ` [PATCH 06/18] net/tls: implement ->read_sock() Hannes Reinecke
2023-04-17 15:14 ` Sagi Grimberg
2023-04-17 13:02 ` [PATCH 07/18] net/tls: sanitize MSG_EOR handling Hannes Reinecke
2023-04-17 15:19 ` Sagi Grimberg
2023-04-17 20:10 ` Jakub Kicinski
2023-04-18 10:07 ` Sagi Grimberg
2023-04-18 10:24 ` Hannes Reinecke
2023-04-18 10:39 ` Hannes Reinecke [this message]
2023-04-18 10:43 ` Sagi Grimberg
2023-04-18 11:02 ` Hannes Reinecke
2023-04-18 18:28 ` Jakub Kicinski
2023-04-17 13:02 ` [PATCH 08/18] nvme-tcp: do not set MSG_SENDPAGE_NOTLAST Hannes Reinecke
2023-04-17 15:10 ` Sagi Grimberg
2023-04-17 15:25 ` Hannes Reinecke
2023-04-17 15:28 ` Sagi Grimberg
2023-04-17 15:35 ` Hannes Reinecke
2023-04-17 20:16 ` Jakub Kicinski
2023-04-18 10:33 ` Hannes Reinecke
2023-04-18 18:21 ` Jakub Kicinski
2023-04-18 18:25 ` Hannes Reinecke
2023-04-17 13:02 ` [PATCH 09/18] security/keys: export key_lookup() Hannes Reinecke
2023-04-17 13:02 ` [PATCH 10/18] nvme/tcp: allocate socket file Hannes Reinecke
2023-04-17 13:02 ` [PATCH 11/18] nvme-tcp: enable TLS handshake upcall Hannes Reinecke
2023-04-17 15:26 ` Sagi Grimberg
2023-04-17 15:28 ` Hannes Reinecke
2023-04-17 15:31 ` Sagi Grimberg
2023-04-17 15:36 ` Hannes Reinecke
2023-04-18 5:52 ` Daniel Wagner
2023-04-18 9:38 ` Hannes Reinecke
2023-04-18 10:12 ` Sagi Grimberg
2023-04-18 10:28 ` Hannes Reinecke
2023-04-18 10:32 ` Sagi Grimberg
2023-04-18 10:33 ` Hannes Reinecke
2023-04-17 13:02 ` [PATCH 12/18] nvme-tcp: control message handling for recvmsg() Hannes Reinecke
2023-04-17 15:24 ` Sagi Grimberg
2023-04-17 15:26 ` Hannes Reinecke
2023-04-17 13:02 ` [PATCH 13/18] nvme-fabrics: parse options 'keyring' and 'tls_key' Hannes Reinecke
2023-04-17 13:02 ` [PATCH 14/18] nvmet: make TCP sectype settable via configfs Hannes Reinecke
2023-04-17 13:02 ` [PATCH 15/18] nvmet-tcp: allocate socket file Hannes Reinecke
2023-04-17 15:29 ` Sagi Grimberg
2023-04-17 13:03 ` [PATCH 16/18] nvmet-tcp: enable TLS handshake upcall Hannes Reinecke
2023-04-17 13:03 ` [PATCH 17/18] nvmet-tcp: control messages for recvmsg() Hannes Reinecke
2023-04-17 13:03 ` [PATCH 18/18] nvmet-tcp: add configfs attribute 'param_keyring' Hannes Reinecke
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