705df5466c
Some NIC supports loopback mode and this is done by calling nc->info->receive() directly which in fact suppresses the effort of reentrancy check that is done in qemu_net_queue_send(). Unfortunately we can't use qemu_net_queue_send() here since for loopback there's no sender as peer, so this patch introduce a qemu_receive_packet() which is used for implementing loopback mode for a NIC with this check. NIC that supports loopback mode will be converted to this helper. This is intended to address CVE-2021-3416. Cc: Prasad J Pandit <ppandit@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Cc: qemu-stable@nongnu.org Signed-off-by: Jason Wang <jasowang@redhat.com>
84 lines
3.2 KiB
C
84 lines
3.2 KiB
C
/*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2009 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef QEMU_NET_QUEUE_H
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#define QEMU_NET_QUEUE_H
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typedef struct NetPacket NetPacket;
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typedef struct NetQueue NetQueue;
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typedef void (NetPacketSent) (NetClientState *sender, ssize_t ret);
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#define QEMU_NET_PACKET_FLAG_NONE 0
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#define QEMU_NET_PACKET_FLAG_RAW (1<<0)
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/* Returns:
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* >0 - success
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* 0 - queue packet for future redelivery
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* <0 - failure (discard packet)
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*/
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typedef ssize_t (NetQueueDeliverFunc)(NetClientState *sender,
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unsigned flags,
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const struct iovec *iov,
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int iovcnt,
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void *opaque);
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NetQueue *qemu_new_net_queue(NetQueueDeliverFunc *deliver, void *opaque);
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void qemu_net_queue_append_iov(NetQueue *queue,
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NetClientState *sender,
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unsigned flags,
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const struct iovec *iov,
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int iovcnt,
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NetPacketSent *sent_cb);
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void qemu_del_net_queue(NetQueue *queue);
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ssize_t qemu_net_queue_receive(NetQueue *queue,
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const uint8_t *data,
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size_t size);
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ssize_t qemu_net_queue_receive_iov(NetQueue *queue,
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const struct iovec *iov,
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int iovcnt);
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ssize_t qemu_net_queue_send(NetQueue *queue,
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NetClientState *sender,
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unsigned flags,
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const uint8_t *data,
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size_t size,
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NetPacketSent *sent_cb);
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ssize_t qemu_net_queue_send_iov(NetQueue *queue,
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NetClientState *sender,
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unsigned flags,
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const struct iovec *iov,
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int iovcnt,
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NetPacketSent *sent_cb);
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void qemu_net_queue_purge(NetQueue *queue, NetClientState *from);
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bool qemu_net_queue_flush(NetQueue *queue);
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#endif /* QEMU_NET_QUEUE_H */
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