Commit Graph

248 Commits

Author SHA1 Message Date
Jan Kiszka 6eed18568d net: Consistently use qemu_macaddr_default_if_unset
Drop the open-coded MAC assignment from net_init_nic and replace it with
standard qemu_macaddr_default_if_unset which is also used by qdev. That
avoid creating colliding MACs when instantiating NICs via different
mechanisms.

This change requires to store the MAC as MACAddr in NICInfo, and the
remaining nd_table users need to be updated.

Based on suggestion by Peter Maydell.

CC: Markus Armbruster <armbru@redhat.com>
CC: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-07-23 10:19:50 -05:00
Jan Kiszka 44e798d395 net: Dump client type 'info network'
Include the client type name into the output of 'info network'. The
result looks like this:

(qemu) info network
VLAN 0 devices:
  rtl8139.0: type=nic,model=rtl8139,macaddr=52:54:00:12:34:57
Devices not on any VLAN:
  virtio-net-pci.0: type=nic,model=virtio-net-pci,macaddr=52:54:00:12:34:56
   \ network1: type=tap,fd=5

CC: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-07-23 10:19:50 -05:00
Jan Kiszka 6f7b3b1be2 net: Refactor net_client_types
Position entries of net_client_types according to the corresponding
values of NET_CLIENT_TYPE_*. The array size is now defined by
NET_CLIENT_TYPE_MAX. This will allow to obtain entries based on type
value in later patches.

At this chance rename NET_CLIENT_TYPE_SLIRP to NET_CLIENT_TYPE_USER for
the sake of consistency.

CC: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-07-23 10:19:50 -05:00
Jan Kiszka 19061e63c0 net: Improve layout of 'info network'
Improve the layout when listing non-vlan clients via 'info network'. The
result looks like this:

(qemu) info network
Devices not on any VLAN:
  orphan: net=10.0.2.0, restricted=n
  virtio-net-pci.0: model=virtio-net-pci,macaddr=52:54:00:12:34:56
   \ network2: fd=5
  e1000.0: model=e1000,macaddr=52:54:00:12:34:57
   \ network1: net=10.0.2.0, restricted=n
  rtl8139.0: model=rtl8139,macaddr=52:54:00:12:34:58

ie. peers are grouped, orphans are listed as before.

CC: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-07-23 10:19:50 -05:00
Markus Armbruster 6daf194dde Strip trailing '\n' from error_report()'s first argument
error_report() prepends location, and appends a newline.  The message
constructed from the arguments should not contain a newline.  Fix the
obvious offenders.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-06-24 09:13:36 +01:00
Peter Maydell 48e2faf222 net: Warn about "-net nic" options which were ignored
Diagnose the case where the user asked for a NIC via "-net nic"
but the board didn't instantiate that NIC (for example where the
user asked for two NICs but the board only supports one). Note
that this diagnostic doesn't apply to NICs created through -device,
because those are always instantiated.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-06-22 07:18:39 -05:00
Peter Maydell 641f6eae75 net: Don't warn about the default network setup
Don't warn about the default network setup that you get if no command line
-net options are specified.  There are two cases that we would otherwise
complain about:

(1) board doesn't support a NIC but the implicit "-net nic" requested one
(2) CONFIG_SLIRP not set, so the implicit "-net nic" sets up a nic that
isn't connected to anything

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-06-22 07:18:38 -05:00
Peter Maydell 1d66f17094 Revert "net: Improve the warnings for dubious command line option combinations"
This reverts commit f68b9d672b.
That attempt at diagnosing unused -net nic options failed to account
for NICs created via -device; back it out cleanly in preparation
for implementing in a different manner.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-06-22 07:18:38 -05:00
Blue Swirl a08784dd11 Remove unused sysemu.h include directives
Remove unused sysemu.h include directives to speed up build
with the following patches.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-04-15 18:25:41 +00:00
Peter Maydell f68b9d672b net: Improve the warnings for dubious command line option combinations
Improve the warnings we give if the user specified a combination of -net
options which don't make much sense:
 * Don't warn about anything if the config is the implicit default
   "-net user -net nic" rather than one specified by the user (this will
   only kick in for boards with no NIC or if CONFIG_SLIRP is not set)
 * Diagnose the case where the user asked for NICs which the board
   didn't instantiate (for example where the user asked for two NICs
   but the board only supports one)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2011-04-01 22:53:49 +02:00
Tristan Gingold ac60cc1871 Fix net_check_clients warnings: make it per vlan.
Signed-off-by: Tristan Gingold <gingold@adacore.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2011-04-01 22:32:27 +02:00
Jason Wang 96c94b298f net: Add the missing option declaration of "vhostforce"
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2011-03-06 20:15:31 +01:00
Juan Quintela 85bb6d36b0 net: remove parse_host_src_port() function
It was deprecated, and it has no users.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2011-03-06 20:06:50 +01:00
Benjamin Poirier ce0536616d net: Use iov helper functions
Signed-off-by: Benjamin Poirier <benjamin.poirier@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2011-03-06 19:29:14 +01:00
Vincent Palatin 60c07d933c net: fix qemu_can_send_packet logic
If any of the clients is not ready to receive (ie it has a can_receive
callback and can_receive() returns false), we don't want to start
sending, else this client may miss/discard the packet.

I got this behaviour with the following setup :
the emulated machine is using an USB-ethernet adapter, it is connected
to the network using SLIRP and I'm dumping the traffic in a .pcap file.
As per the following command line :
-net nic,model=usb,vlan=1 -net user,vlan=1 -net dump,vlan=1,file=/tmp/pkt.pcap
Every time that two packets are coming in a row from the host, the
usb-net code will receive the first one, then returns 0 to can_receive
call since it has a 1 packet long queue. But as the dump code is always
ready to receive, qemu_can_send_packet will return true and the next
packet will discard the previous one in the usb-net code.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-03-05 12:00:59 +00:00
Michael S. Tsirkin ab1cbe1c6d net: notify peer about link status change
qemu makes it possible to disable link at tap which is not communicated
to the guest but causes all packets to be dropped.

This works for virtio userspace, as qemu stops giving it packets, but
not for virtio-net connected to vhost-net as that does not get notified
about this change.

Notify peer when this happens, which will then be used by the follow-up
patch to stop/start vhost-net.

Note: it might be a good idea to make peer link status match tap in this
case, so the guest gets an event and updates the carrier state. For now
stay bug for bug compatible with what we used to have in userspace.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reported-by: pradeep <psuriset@linux.vnet.ibm.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2011-02-20 18:05:48 +01:00
Mike Ryan 3a75e74c76 net/sock: option to specify local address
Add an option to specify the host IP to send multicast packets from,
when using a multicast socket for networking. The option takes an IP
address and sets the IP_MULTICAST_IF socket option, which causes the
packets to use that IP's interface as an egress.

This is useful if the host machine has several interfaces with several
virtual networks across disparate interfaces.

Signed-off-by: Mike Ryan <mikeryan@ISI.EDU>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-12-09 12:45:50 +02:00
Jason Wang f7c31d6381 net: properly handle illegal fd/vhostfd from command line
When hanlding fd/vhostfd form command line through net_handle_fd_param(),
we need to check mon and return value of strtol() otherwise we could
get segmentation fault or invalid fd when user type an illegal fd/vhostfd.

This patch is based on the suggestions from
Luiz Capitulino <lcapitulino@redhat.com>.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-10-27 18:54:02 +02:00
Michael S. Tsirkin a083a89d72 net: delay freeing peer host device
With -netdev, virtio devices present offload
features to guest, depending on the backend used.
Thus, removing host netdev peer while guest is
active leads to guest-visible inconsistency and/or crashes.

As a solution, while guest (NIC) peer device exists,
we prevent the host peer from being deleted.
This patch does this by adding peer_deleted flag in nic state:
if host device is going away while guest device
is around, set this flag and keep a shell of
the host device around for as long as guest device exists.

The link is put down so all packets will get discarded.

At the moment, management can detect that device deletion
is delayed by doing info net. As a next step, we shall add
commands that control hotplug/unplug without
removing the device, and an event to report that
guest has responded to the hotplug event.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
2010-10-06 18:24:37 +02:00
Gerd Hoffmann 3329f07b7a QemuOpts: make most qemu_*_opts static
Switch tree to lookup-by-name using qemu_find_opts().
Also hook up virtfs options so qemu_find_opts works for them too.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-08-22 17:11:06 -05:00
Yoshiaki Tamura 410cbafebc net: delete QemuOpts when net_client_init() fails.
This fixes the following scenario using QMP.

First, put a bogus argument "foo" to "type", which results in an error.
{"execute": "netdev_add", "arguments": { "type": "foo", "id": "netdev1" } }
Then, call it again with correct argument "user".
{"execute": "netdev_add", "arguments": { "type": "user", "id": "netdev1" } }
This results in "DuplicatedId" error.

Because the first command was invalid, it should be able to reuse the
same "id", and the second command should work.

Reported-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Yoshiaki Tamura <tamura.yoshiaki@lab.ntt.co.jp>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2010-07-01 14:27:13 -03:00
Amit Shah 03c71553ad net: Fix VM start with '-net none'
Commit 50e32ea8f3 changed the behaviour
for the return type of net_client_init() when a nic type with no init
method was specified. 'none' is one such nic type. Instead of returning
0, which gets interpreted as an index into the nd_table[] array, we
switched to returning -1, which signifies an error as well.

That broke VM start with '-net none'. Testing was only done with the
monitor command 'pci_add', which doesn't fail.

The correct fix would still be to return 0+ values from
net_client_init() only when the return value can be used as an index to
refer to an entry in nd_table[]. With the current code, callers can
erroneously poke into nd_table[0] when -net nic is used, which can lead
to badness.

However, this commit just returns to the previous behaviour before the
offending commit.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-06-30 22:35:57 +02:00
Markus Armbruster 2ffcb18de0 Make netdev_del delete the netdev even when it's in use
To hot-unplug guest and host part of a network device, you do:

    device_del NIC-ID
    netdev_del NETDEV-ID

For PCI devices, device_del merely tells ACPI to unplug the device.
The device goes away for real only after the guest processed the ACPI
unplug event.

You have to wait until then (e.g. by polling info pci) before you can
unplug the netdev.  Not good.

Fix by removing the "in use" check from do_netdev_del().  Deleting a
netdev while it's in use is safe; packets simply get routed to the bit
bucket.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-06-14 11:12:53 -05:00
Anthony Liguori 60a3992e75 Merge remote branch 'mst/for_anthony' into staging 2010-06-10 09:21:43 -05:00
Amit Shah 50e32ea8f3 net: Fix hotplug with pci_add
The correct model type wasn't getting added when hotplugging nics with
pci_add.

Testcase: start VM with default nic type. In the qemu_monitor:

(qemu) pci_add auto nic model=virtio

This results in a nic hot-plug of the same nic type as the default.

This was broken in 5294e2c774

Also changes the behaviour where no .init is defined for a
net_client_type. Previously, 0 was returned, which indicated the init
was successful and that 0 was the index into the nd_tables[] array.
Return -1, indicating unsuccessful init, in such a case.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-06-09 12:58:55 +03:00
Luiz Capitulino 637503d122 Monitor: Drop QMP documentation from code
Previous commit added QMP documentation to the qemu-monitor.hx
file, it's is a copy of this information.

While it's good to keep it near code, maintaining two copies of
the same information is too hard and has little benefit as we
don't expect client writers to consult the code to find how to
use a QMP command.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-06-01 13:48:43 -05:00
Markus Armbruster 5369e3c0b8 monitor: Convert do_set_link() to QObject, QError
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2010-04-18 23:55:19 +02:00
Markus Armbruster c9b26a4cbe monitor: Use argument type 'b' for set_link
Second argument is now "on" or "off" instead of "up" or "down".

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2010-04-18 23:55:19 +02:00
Markus Armbruster ae82d3242d monitor: New commands netdev_add, netdev_del
Monitor commands to go with -netdev.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2010-04-18 23:55:16 +02:00
Markus Armbruster 5294e2c774 error: Convert net_client_init() to QError
The conversion is shallow: client type init() methods aren't
converted.  Converting them is a big job for relatively little
practical benefit, so leave it for later.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2010-04-18 23:46:48 +02:00
Markus Armbruster c389c43ee5 error: Drop extra messages after qemu_opts_set() and qemu_opts_parse()
Both functions report errors nicely enough now, no need for additional
messages.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2010-04-18 23:46:48 +02:00
Eduardo Habkost da1fcfda59 net: remove broken net_set_boot_mask() boot device validation
There are many problems with net_set_boot_mask():

1) It is broken when using the device model instead of "-net nic". Example:
   $ qemu-system-x86_64 -device rtl8139,vlan=0,id=net0,mac=52:54:00:82:41:fd,bus=pci.0,addr=0x4 -net user,vlan=0,name=hostnet0 -vnc 0.0.0.0:0 -boot n
   Cannot boot from non-existent NIC
   $
2) The mask was previously used to set which boot ROMs were supposed to be
   loaded, but this was changed long time ago. Now all ROM images are loaded,
   and SeaBIOS takes care of jumping to the right boot entry point depending on
   the boot settings.
3) Interpretation and validation of the boot parameter letters is done on
   the machine type code. Examples: PC accepts only a,b,c,d,n as valid boot
   device letters. mac99 accepts only a,b,c,d,e,f.

As a side-effect of this change, qemu-kvm won't abort anymore if using "-boot n"
on a machine with no network devices. Checking if the requested boot device is
valid is now a task for the BIOS or the machine-type code.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-04-10 02:09:55 +02:00
Eduardo Habkost c2564608a1 net: remove NICInfo.bootable field
It is just set by net_set_boot_mask() and never used. The logic for rom loading
changed a lot since this field was introduced. It is not needed anymore.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-04-10 02:09:48 +02:00
Michael S. Tsirkin 82b0d80ef6 tap: add vhost/vhostfd options
This adds vhost binary option to tap, to enable vhost net accelerator.
Default is off for now, we'll be able to make default on long term
when we know it's stable.

vhostfd option can be used by management, to pass in the fd. Assigning
vhostfd implies vhost=on.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-04-01 13:56:43 -05:00
Markus Armbruster 8212c64f0e qemu-option: Move the implied first name into QemuOptsList
We sometimes permit omitting the first option name, for example
-device foo is short for -device driver=foo.  The name to use
("driver" in the example) is passed as argument to qemu_opts_parse().
For each QemuOptsList, we use at most one such name.

Move the name into QemuOptsList, and pass whether to permit the
abbreviation.  This ensures continued consistency, and simplifies the
commit after next in this series.
2010-03-16 17:45:34 +01:00
Markus Armbruster 1ecda02b24 error: Replace qemu_error() by error_report()
error_report() terminates the message with a newline.  Strip it it
from its arguments.

This fixes a few error messages lacking a newline:
net_handle_fd_param()'s "No file descriptor named %s found", and
tap_open()'s "vnet_hdr=1 requested, but no kernel support for
IFF_VNET_HDR available" (all three versions).

There's one place that passes arguments without newlines
intentionally: load_vmstate().  Fix it up.
2010-03-16 16:58:32 +01:00
Markus Armbruster 27f3f8a362 qdev: Catch attempt to attach more than one device to a netdev
Guest device and host netdev are peers, i.e. it's a 1:1 relation.
However, we fail to enforce that:

    $ qemu -nodefaults --nographic -netdev user,id=net0 -device e1000,netdev=net0 -device virtio-net-pci,netdev=net0 -monitor stdio
    QEMU 0.12.50 monitor - type 'help' for more information
    (qemu) info network
    Devices not on any VLAN:
      net0: net=10.0.2.0, restricted=n peer=virtio-net-pci.0
      e1000.0: model=e1000,macaddr=52:54:00:12:34:56 peer=net0
      virtio-net-pci.0: model=virtio-net-pci,macaddr=52:54:00:12:34:57 peer=net0

It's all downhill from there.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-03-09 08:47:20 -06:00
Amit Shah 75422b0d38 qdev: Add a DEV_NVECTORS_UNSPECIFIED enum for unspecified nr of MSI vectors
net.c used a constant to signify no MSI vectors were specified. Extend
that to all qdev devices.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reported-by: "Michael S. Tsirkin" <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-03-08 11:30:09 -06:00
Blue Swirl 238431a9d8 Allow const QemuOptDesc
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-02-21 16:01:30 +00:00
Blue Swirl 64e69d50a3 Fix warning on OpenBSD
/src/qemu/net.c: In function `net_check_clients':
/src/qemu/net.c:1287: warning: `has_nic' might be used uninitialized in this function
/src/qemu/net.c:1287: warning: `has_host_dev' might be used uninitialized in this function

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-02-20 08:20:18 +00:00
Markus Armbruster 2583ba97ef net: Monitor command set_link finds only VLAN clients, fix
Clients not associated with a VLAN exist since commit d80b9fc6.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-02-19 12:12:47 -06:00
Markus Armbruster a0104e0ec7 net: info network shows only VLAN clients, fix
Clients not associated with a VLAN exist since commit d80b9fc6.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-02-19 12:12:47 -06:00
Markus Armbruster efe32fdde1 net: net_check_clients() checks only VLAN clients, fix
Clients not associated with a VLAN exist since commit d80b9fc6.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-02-19 12:12:47 -06:00
Markus Armbruster 62112d181c net: Fix bogus "Warning: vlan 0 with no nics" with -device
net_check_clients() prints this when an VLAN has host devices, but no
guest devices.  It uses VLANState members nb_guest_devs and
nb_host_devs to keep track of these devices.  However, -device does
not update nb_guest_devs, only net_init_nic() does that, for -net nic.

Check the VLAN clients directly, and remove the counters.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-02-19 12:12:46 -06:00
Markus Armbruster 668680f75f net: net_check_clients() runs too early to see -device, fix
Call it right after -device devices get created.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-02-19 12:12:46 -06:00
Markus Armbruster 7f76abe1c9 net: Remove unused net_client_uninit()
Unused since commit 9ad4531e.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-02-19 12:12:46 -06:00
Jim Meyering 6265eb26a3 don't dereference NULL after failed strdup
Most of these are obvious NULL-deref bug fixes, for example,
the ones in these files:

  block/curl.c
  net.c
  slirp/misc.c

and the first one in block/vvfat.c.
The others in block/vvfat.c may not lead to an immediate segfault, but I
traced the two schedule_rename(..., strdup(path)) uses, and a failed
strdup would appear to trigger this assertion in handle_renames_and_mkdirs:

	    assert(commit->path);

The conversion to use qemu_strdup in envlist_to_environ is not technically
needed, but does avoid a theoretical leak in the caller when strdup fails
for one value, but later succeeds in allocating another buffer(plausible,
if one string length is much larger than the others).  The caller does
not know the length of the returned list, and as such can only free
pointers until it hits the first NULL.  If there are non-NULL pointers
beyond the first, their buffers would be leaked.  This one is admittedly
far-fetched.

The two in linux-user/main.c are worth fixing to ensure that an
OOM error is diagnosed up front, rather than letting it provoke some
harder-to-diagnose secondary error, in case of exec failure, or worse, in
case the exec succeeds but with an invalid list of command line options.
However, considering how unlikely it is to encounter a failed strdup early
in main, this isn't a big deal.  Note that adding the required uses of
qemu_strdup here and in envlist.c induce link failures because qemu_strdup
is not currently in any library they're linked with.  So for now, I've
omitted those changes, as well as the fixes in target-i386/helper.c
and target-sparc/helper.c.

If you'd like to see the above discussion (or anything else)
in the commit log, just let me know and I'll be happy to adjust.

>From 9af42864fd1ea666bd25e2cecfdfae74c20aa8c7 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Mon, 8 Feb 2010 18:29:29 +0100
Subject: [PATCH] don't dereference NULL after failed strdup

Handle failing strdup by replacing each use with qemu_strdup,
so as not to dereference NULL or trigger a failing assertion.
* block/curl.c (curl_open): s/\bstrdup\b/qemu_strdup/
* block/vvfat.c (init_directories): Likewise.
(get_cluster_count_for_direntry, check_directory_consistency): Likewise.
* net.c (parse_host_src_port): Likewise.
* slirp/misc.c (fork_exec): Likewise.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-02-10 14:00:53 -06:00
Gerd Hoffmann cb4522ccf6 default devices: network
Add a default_net variable which specified whenever a default network
should be created.  It is cleared in case any -net option is specified
and it is also added to the new -nodefaults switch.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-12-12 07:59:43 -06:00
Mark McLoughlin 0f2fbf40a9 net: print correct error for '-netdev ""'
Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-12-03 09:41:35 -06:00
Mark McLoughlin 57f9ef173d net: add qemu_foreach_nic()
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-12-03 09:41:35 -06:00