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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Michael S. Tsirkin" , Jason Wang , Bobby Eshleman CC: , , , , , , , Arseniy Krasnov Subject: [RFC PATCH v2 2/4] virtio/vsock: support MSG_PEEK for SOCK_SEQPACKET Date: Wed, 19 Jul 2023 22:27:06 +0300 Message-ID: <20230719192708.1775162-3-AVKrasnov@sberdevices.ru> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20230719192708.1775162-1-AVKrasnov@sberdevices.ru> References: <20230719192708.1775162-1-AVKrasnov@sberdevices.ru> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Originating-IP: [100.64.160.123] X-ClientProxiedBy: p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 178730 [Jul 19 2023] X-KSMG-AntiSpam-Version: 5.9.59.0 X-KSMG-AntiSpam-Envelope-From: AVKrasnov@sberdevices.ru X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 524 524 9753033d6953787301affc41bead8ed49c47b39d, {Tracking_from_domain_doesnt_match_to}, p-i-exch-sc-m01.sberdevices.ru:5.0.1,7.1.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;100.64.160.123:7.1.2;127.0.0.199:7.1.2;sberdevices.ru:5.0.1,7.1.1, FromAlignment: s, {Tracking_white_helo}, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/07/19 15:29:00 #21641898 X-KSMG-AntiVirus-Status: Clean, skipped X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC This adds support of MSG_PEEK flag for SOCK_SEQPACKET type of socket. Difference with SOCK_STREAM is that this callback returns either length of the message or error. Signed-off-by: Arseniy Krasnov Reviewed-by: Stefano Garzarella --- net/vmw_vsock/virtio_transport_common.c | 63 +++++++++++++++++++++++-- 1 file changed, 60 insertions(+), 3 deletions(-) diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index 2ee40574c339..352d042b130b 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -460,6 +460,63 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, return err; } +static ssize_t +virtio_transport_seqpacket_do_peek(struct vsock_sock *vsk, + struct msghdr *msg) +{ + struct virtio_vsock_sock *vvs = vsk->trans; + struct sk_buff *skb; + size_t total, len; + + spin_lock_bh(&vvs->rx_lock); + + if (!vvs->msg_count) { + spin_unlock_bh(&vvs->rx_lock); + return 0; + } + + total = 0; + len = msg_data_left(msg); + + skb_queue_walk(&vvs->rx_queue, skb) { + struct virtio_vsock_hdr *hdr; + + if (total < len) { + size_t bytes; + int err; + + bytes = len - total; + if (bytes > skb->len) + bytes = skb->len; + + spin_unlock_bh(&vvs->rx_lock); + + /* sk_lock is held by caller so no one else can dequeue. + * Unlock rx_lock since memcpy_to_msg() may sleep. + */ + err = memcpy_to_msg(msg, skb->data, bytes); + if (err) + return err; + + spin_lock_bh(&vvs->rx_lock); + } + + total += skb->len; + hdr = virtio_vsock_hdr(skb); + + if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SEQ_EOM) { + if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SEQ_EOR) + msg->msg_flags |= MSG_EOR; + + break; + } + } + + spin_unlock_bh(&vvs->rx_lock); + + return total; +} + static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk, struct msghdr *msg, int flags) @@ -554,9 +611,9 @@ virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk, int flags) { if (flags & MSG_PEEK) - return -EOPNOTSUPP; - - return virtio_transport_seqpacket_do_dequeue(vsk, msg, flags); + return virtio_transport_seqpacket_do_peek(vsk, msg); + else + return virtio_transport_seqpacket_do_dequeue(vsk, msg, flags); } EXPORT_SYMBOL_GPL(virtio_transport_seqpacket_dequeue);