From 9d94619189d899b2b40e9dfaa0ede64c8b81e5ab Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Mon, 30 Apr 2018 09:26:45 +0200 Subject: [PATCH 1/4] net: Fix memory leak in net_param_nic() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The early exits in case of errors leak the memory allocated for nd_id. Fix it by using a "goto out" to the cleanup at the end of the function instead. Reviewed-by: Peter Maydell Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Thomas Huth Signed-off-by: Jason Wang --- net/net.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/net.c b/net/net.c index 29f83983e5..65457b7976 100644 --- a/net/net.c +++ b/net/net.c @@ -1502,11 +1502,12 @@ static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) g_free(mac); if (ret) { error_setg(errp, "invalid syntax for ethernet address"); - return -1; + goto out; } if (is_multicast_ether_addr(ni->macaddr.a)) { error_setg(errp, "NIC cannot have multicast MAC address"); - return -1; + ret = -1; + goto out; } } qemu_macaddr_default_if_unset(&ni->macaddr); @@ -1518,6 +1519,7 @@ static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) nb_nics++; } +out: g_free(nd_id); return ret; } From af1a5c3eb41521b4f090ad6125cd981b72b99ab9 Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Mon, 30 Apr 2018 20:02:23 +0200 Subject: [PATCH 2/4] net: Remove the deprecated "vlan" parameter It's been marked as deprecated since QEMU v2.9.0, so that should have been enough time for everybody to either just drop unnecessary "vlan=0" parameters, to switch to the modern -device + -netdev syntax for connecting guest NICs with host network backends, or to switch to the "hubport" netdev in case hubs are really wanted instead. Buglink: https://bugs.launchpad.net/qemu/+bug/658904 Signed-off-by: Thomas Huth Reviewed-by: Stefan Hajnoczi Signed-off-by: Jason Wang --- docs/qdev-device-use.txt | 3 -- hw/core/qdev-properties-system.c | 80 -------------------------------- include/hw/qdev-properties.h | 3 -- include/net/net.h | 1 - net/net.c | 12 ++--- qapi/net.json | 15 +++--- qemu-doc.texi | 9 ---- qemu-options.hx | 29 +++++------- 8 files changed, 22 insertions(+), 130 deletions(-) diff --git a/docs/qdev-device-use.txt b/docs/qdev-device-use.txt index 8f188d1d0b..98229b3405 100644 --- a/docs/qdev-device-use.txt +++ b/docs/qdev-device-use.txt @@ -277,9 +277,6 @@ devices and ne2k_isa are. Some PCI devices aren't available with -net nic, e.g. i82558a. -To connect to a VLAN instead of an ordinary host part, replace -netdev=NET-ID by vlan=VLAN. - === Graphics Devices === Host and guest part of graphics devices have always been separate. diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index 1d3ba722fa..8b22fb51c9 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -321,86 +321,6 @@ const PropertyInfo qdev_prop_netdev = { .set = set_netdev, }; -/* --- vlan --- */ - -static int print_vlan(DeviceState *dev, Property *prop, char *dest, size_t len) -{ - NetClientState **ptr = qdev_get_prop_ptr(dev, prop); - - if (*ptr) { - int id; - if (!net_hub_id_for_client(*ptr, &id)) { - return snprintf(dest, len, "%d", id); - } - } - - return snprintf(dest, len, ""); -} - -static void get_vlan(Object *obj, Visitor *v, const char *name, void *opaque, - Error **errp) -{ - DeviceState *dev = DEVICE(obj); - Property *prop = opaque; - NetClientState **ptr = qdev_get_prop_ptr(dev, prop); - int32_t id = -1; - - if (*ptr) { - int hub_id; - if (!net_hub_id_for_client(*ptr, &hub_id)) { - id = hub_id; - } - } - - visit_type_int32(v, name, &id, errp); -} - -static void set_vlan(Object *obj, Visitor *v, const char *name, void *opaque, - Error **errp) -{ - DeviceState *dev = DEVICE(obj); - Property *prop = opaque; - NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop); - NetClientState **ptr = &peers_ptr->ncs[0]; - Error *local_err = NULL; - int32_t id; - NetClientState *hubport; - - if (dev->realized) { - qdev_prop_set_after_realize(dev, name, errp); - return; - } - - visit_type_int32(v, name, &id, &local_err); - if (local_err) { - error_propagate(errp, local_err); - return; - } - if (id == -1) { - *ptr = NULL; - return; - } - if (*ptr) { - error_set_from_qdev_prop_error(errp, -EINVAL, dev, prop, name); - return; - } - - hubport = net_hub_port_find(id); - if (!hubport) { - error_setg(errp, QERR_INVALID_PARAMETER_VALUE, - name, prop->info->name); - return; - } - *ptr = hubport; -} - -const PropertyInfo qdev_prop_vlan = { - .name = "int32", - .description = "Integer VLAN id to connect to", - .print = print_vlan, - .get = get_vlan, - .set = set_vlan, -}; void qdev_prop_set_drive(DeviceState *dev, const char *name, BlockBackend *value, Error **errp) diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h index b2ad8e9faa..4f60cc88f3 100644 --- a/include/hw/qdev-properties.h +++ b/include/hw/qdev-properties.h @@ -29,7 +29,6 @@ extern const PropertyInfo qdev_prop_bios_chs_trans; extern const PropertyInfo qdev_prop_fdc_drive_type; extern const PropertyInfo qdev_prop_drive; extern const PropertyInfo qdev_prop_netdev; -extern const PropertyInfo qdev_prop_vlan; extern const PropertyInfo qdev_prop_pci_devfn; extern const PropertyInfo qdev_prop_blocksize; extern const PropertyInfo qdev_prop_pci_host_devaddr; @@ -195,8 +194,6 @@ extern const PropertyInfo qdev_prop_off_auto_pcibar; DEFINE_PROP(_n, _s, _f, qdev_prop_string, char*) #define DEFINE_PROP_NETDEV(_n, _s, _f) \ DEFINE_PROP(_n, _s, _f, qdev_prop_netdev, NICPeers) -#define DEFINE_PROP_VLAN(_n, _s, _f) \ - DEFINE_PROP(_n, _s, _f, qdev_prop_vlan, NICPeers) #define DEFINE_PROP_DRIVE(_n, _s, _f) \ DEFINE_PROP(_n, _s, _f, qdev_prop_drive, BlockBackend *) #define DEFINE_PROP_MACADDR(_n, _s, _f) \ diff --git a/include/net/net.h b/include/net/net.h index 1f7341e459..1425960f76 100644 --- a/include/net/net.h +++ b/include/net/net.h @@ -37,7 +37,6 @@ typedef struct NICConf { #define DEFINE_NIC_PROPERTIES(_state, _conf) \ DEFINE_PROP_MACADDR("mac", _state, _conf.macaddr), \ - DEFINE_PROP_VLAN("vlan", _state, _conf.peers), \ DEFINE_PROP_NETDEV("netdev", _state, _conf.peers) diff --git a/net/net.c b/net/net.c index 65457b7976..efb9eaf779 100644 --- a/net/net.c +++ b/net/net.c @@ -965,7 +965,6 @@ static int net_client_init1(const void *object, bool is_netdev, Error **errp) const Netdev *netdev; const char *name; NetClientState *peer = NULL; - static bool vlan_warned; if (is_netdev) { netdev = object; @@ -1036,15 +1035,10 @@ static int net_client_init1(const void *object, bool is_netdev, Error **errp) return -1; } - /* Do not add to a vlan if it's a nic with a netdev= parameter. */ + /* Do not add to a hub if it's a nic with a netdev= parameter. */ if (netdev->type != NET_CLIENT_DRIVER_NIC || !opts->u.nic.has_netdev) { - peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL, NULL); - } - - if (net->has_vlan && !vlan_warned) { - error_report("'vlan' is deprecated. Please use 'netdev' instead."); - vlan_warned = true; + peer = net_hub_add_port(0, NULL, NULL); } } @@ -1365,7 +1359,7 @@ void qmp_set_link(const char *name, bool up, Error **errp) * If the peer is a HUBPORT or a backend, we do not change the * link status. * - * This behavior is compatible with qemu vlans where there could be + * This behavior is compatible with qemu hubs where there could be * multiple clients that can still communicate with each other in * disconnected mode. For now maintain this compatibility. */ diff --git a/qapi/net.json b/qapi/net.json index 9117c56972..b4fe4b660b 100644 --- a/qapi/net.json +++ b/qapi/net.json @@ -209,7 +209,7 @@ ## # @NetdevTapOptions: # -# Connect the host TAP network interface name to the VLAN. +# Used to configure a host TAP network interface backend. # # @ifname: interface name # @@ -267,8 +267,8 @@ ## # @NetdevSocketOptions: # -# Connect the VLAN to a remote VLAN in another QEMU virtual machine using a TCP -# socket connection. +# Socket netdevs are used to establish a network connection to another +# QEMU virtual machine via a TCP socket. # # @fd: file descriptor of an already opened socket # @@ -296,7 +296,7 @@ ## # @NetdevL2TPv3Options: # -# Connect the VLAN to Ethernet over L2TPv3 Static tunnel +# Configure an Ethernet over L2TPv3 tunnel. # # @src: source address # @@ -352,7 +352,7 @@ ## # @NetdevVdeOptions: # -# Connect the VLAN to a vde switch running on the host. +# Connect to a vde switch running on the host. # # @sock: socket path # @@ -490,8 +490,6 @@ # # Captures the configuration of a network device; legacy. # -# @vlan: vlan number -# # @id: identifier for monitor commands # # @name: identifier for monitor commands, ignored if @id is present @@ -499,10 +497,11 @@ # @opts: device type specific properties (legacy) # # Since: 1.2 +# +# 'vlan' - removed with 2.12 ## { 'struct': 'NetLegacy', 'data': { - '*vlan': 'int32', '*id': 'str', '*name': 'str', 'opts': 'NetLegacyOptions' } } diff --git a/qemu-doc.texi b/qemu-doc.texi index 0ed0f19e6b..9216848af7 100644 --- a/qemu-doc.texi +++ b/qemu-doc.texi @@ -2855,15 +2855,6 @@ with ``-device ...,netdev=x''), or ``-nic user,smb=/some/dir'' (for embedded NICs). The new syntax allows different settings to be provided per NIC. -@subsection -net vlan (since 2.9.0) - -The ``-net vlan=NN'' argument was mostly used to attach separate -network backends to different virtual NICs. This is the default -behavior for ``-netdev'' and ``-nic''. You can connect multiple -``-netdev'' and ``-nic'' devices to the same network using the -"hubport" network backend, created with ``-netdev hubport,hubid=NN,...'' -and ``-nic hubport,hubid=NN''. - @subsection -drive cyls=...,heads=...,secs=...,trans=... (since 2.10.0) The drive geometry arguments are replaced by the the geometry arguments diff --git a/qemu-options.hx b/qemu-options.hx index c611766390..3588b04024 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -2003,7 +2003,7 @@ DEF("netdev", HAS_ARG, QEMU_OPTION_netdev, " configure a vhost-user network, backed by a chardev 'dev'\n" #endif "-netdev hubport,id=str,hubid=n[,netdev=nd]\n" - " configure a hub port on QEMU VLAN 'n'\n", QEMU_ARCH_ALL) + " configure a hub port on the hub with ID 'n'\n", QEMU_ARCH_ALL) DEF("nic", HAS_ARG, QEMU_OPTION_nic, "--nic [tap|bridge|" #ifdef CONFIG_SLIRP @@ -2028,10 +2028,9 @@ DEF("nic", HAS_ARG, QEMU_OPTION_nic, " provided a 'user' network connection)\n", QEMU_ARCH_ALL) DEF("net", HAS_ARG, QEMU_OPTION_net, - "-net nic[,vlan=n][,netdev=nd][,macaddr=mac][,model=type][,name=str][,addr=str][,vectors=v]\n" + "-net nic[,macaddr=mac][,model=type][,name=str][,addr=str][,vectors=v]\n" " configure or create an on-board (or machine default) NIC and\n" - " connect it either to VLAN 'n' or the netdev 'nd' (for pluggable\n" - " NICs please use '-device devtype,netdev=nd' instead)\n" + " connect it to hub 0 (please use -nic unless you need a hub)\n" "-net [" #ifdef CONFIG_SLIRP "user|" @@ -2044,7 +2043,7 @@ DEF("net", HAS_ARG, QEMU_OPTION_net, #ifdef CONFIG_NETMAP "netmap|" #endif - "socket][,vlan=n][,option][,option][,...]\n" + "socket][,option][,option][,...]\n" " old way to initialize a host network interface\n" " (use the -netdev option if possible instead)\n", QEMU_ARCH_ALL) STEXI @@ -2462,17 +2461,14 @@ qemu -m 512 -object memory-backend-file,id=mem,size=512M,mem-path=/hugetlbfs,sha Create a hub port on the emulated hub with ID @var{hubid}. The hubport netdev lets you connect a NIC to a QEMU emulated hub instead of a -single netdev. @code{-net} and @code{-device} with the parameter @option{vlan} -(deprecated), or @code{-nic hubport} can also be used to connect a -network device or a NIC to a hub. Alternatively, you can also connect the -hubport to another netdev with ID @var{nd} by using the @option{netdev=@var{nd}} -option. +single netdev. Alternatively, you can also connect the hubport to another +netdev with ID @var{nd} by using the @option{netdev=@var{nd}} option. -@item -net nic[,vlan=@var{n}][,netdev=@var{nd}][,macaddr=@var{mac}][,model=@var{type}] [,name=@var{name}][,addr=@var{addr}][,vectors=@var{v}] +@item -net nic[,netdev=@var{nd}][,macaddr=@var{mac}][,model=@var{type}] [,name=@var{name}][,addr=@var{addr}][,vectors=@var{v}] @findex -net Legacy option to configure or create an on-board (or machine default) Network -Interface Card(NIC) and connect it either to the emulated hub port ("vlan") -with number @var{n} (@var{n} = 0 is the default), or to the netdev @var{nd}. +Interface Card(NIC) and connect it either to the emulated hub with ID 0 (i.e. +the default hub), or to the netdev @var{nd}. The NIC is an e1000 by default on the PC target. Optionally, the MAC address can be changed to @var{mac}, the device address set to @var{addr} (PCI cards only), and a @var{name} can be assigned for use in monitor commands. @@ -2482,11 +2478,10 @@ that the card should have; this option currently only affects virtio cards; set NIC is created. QEMU can emulate several different models of network card. Use @code{-net nic,model=help} for a list of available devices for your target. -@item -net user|tap|bridge|socket|l2tpv3|vde[,...][,vlan=@var{n}][,name=@var{name}] +@item -net user|tap|bridge|socket|l2tpv3|vde[,...][,name=@var{name}] Configure a host network backend (with the options corresponding to the same -@option{-netdev} option) and connect it to the emulated hub ("vlan") with the -number @var{n} (default is number 0). Use @var{name} to specify the name of the -hub port. +@option{-netdev} option) and connect it to the emulated hub 0 (the default +hub). Use @var{name} to specify the name of the hub port. ETEXI STEXI From 442da403ead80525761898ab0d8036a9cd3c6829 Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Mon, 30 Apr 2018 20:02:24 +0200 Subject: [PATCH 3/4] net: Get rid of 'vlan' terminology and use 'hub' instead in the source files 'vlan' is very confusing since it does not mean something like IEEE 802.1Q, but rather emulated hubs, so let's switch to that terminology instead. Buglink: https://bugs.launchpad.net/qemu/+bug/658904 Reviewed-by: Stefan Hajnoczi Signed-off-by: Thomas Huth Signed-off-by: Jason Wang --- net/hub.c | 7 +++---- net/slirp.c | 8 ++++---- net/tap.c | 4 ++-- 3 files changed, 9 insertions(+), 10 deletions(-) diff --git a/net/hub.c b/net/hub.c index 5e84a9ad93..78b671ed95 100644 --- a/net/hub.c +++ b/net/hub.c @@ -23,8 +23,7 @@ /* * A hub broadcasts incoming packets to all its ports except the source port. - * Hubs can be used to provide independent network segments, also confusingly - * named the QEMU 'vlan' feature. + * Hubs can be used to provide independent emulated network segments. */ typedef struct NetHub NetHub; @@ -345,10 +344,10 @@ void net_hub_check_clients(void) } } if (has_host_dev && !has_nic) { - warn_report("vlan %d with no nics", hub->id); + warn_report("hub %d with no nics", hub->id); } if (has_nic && !has_host_dev) { - warn_report("vlan %d is not connected to host network", hub->id); + warn_report("hub %d is not connected to host network", hub->id); } } } diff --git a/net/slirp.c b/net/slirp.c index 8991816bbf..692252445a 100644 --- a/net/slirp.c +++ b/net/slirp.c @@ -415,7 +415,7 @@ static SlirpState *slirp_lookup(Monitor *mon, const char *hub_id, if (hub_id) { nc = net_hub_find_client_by_name(strtol(hub_id, NULL, 0), name); if (!nc) { - monitor_printf(mon, "unrecognized (vlan-id, stackname) pair\n"); + monitor_printf(mon, "unrecognized (hub-id, stackname) pair\n"); return NULL; } } else { @@ -870,9 +870,9 @@ void hmp_info_usernet(Monitor *mon, const QDict *qdict) QTAILQ_FOREACH(s, &slirp_stacks, entry) { int id; - bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0; - monitor_printf(mon, "VLAN %d (%s):\n", - got_vlan_id ? id : -1, + bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0; + monitor_printf(mon, "Hub %d (%s):\n", + got_hub_id ? id : -1, s->nc.name); slirp_connection_info(s->slirp, mon); } diff --git a/net/tap.c b/net/tap.c index 2b3a36f9b5..de05f20e28 100644 --- a/net/tap.c +++ b/net/tap.c @@ -766,10 +766,10 @@ int net_init_tap(const Netdev *netdev, const char *name, queues = tap->has_queues ? tap->queues : 1; vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL; - /* QEMU vlans does not support multiqueue tap, in this case peer is set. + /* QEMU hubs do not support multiqueue tap, in this case peer is set. * For -netdev, peer is always NULL. */ if (peer && (tap->has_queues || tap->has_fds || tap->has_vhostfds)) { - error_setg(errp, "Multiqueue tap cannot be used with QEMU vlans"); + error_setg(errp, "Multiqueue tap cannot be used with hubs"); return -1; } From 0e0266c2e475b82b39a757c875fa03e64272fbe7 Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Mon, 30 Apr 2018 20:02:25 +0200 Subject: [PATCH 4/4] net: Get rid of 'vlan' terminology and use 'hub' instead in the doc files 'vlan' is very confusing since it does not mean something like IEEE 802.1Q, but rather emulated hubs, so let's switch to that terminology instead. While we're at it, move the subsection about hub a little bit downward in the documentation (it's not as important anymore as it was before the invention of the -netdev parameter), and extend it a little bit. Buglink: https://bugs.launchpad.net/qemu/+bug/658904 Reviewed-by: Stefan Hajnoczi Signed-off-by: Thomas Huth Signed-off-by: Jason Wang --- qemu-doc.texi | 42 +++++++++++++++++++++++------------------- 1 file changed, 23 insertions(+), 19 deletions(-) diff --git a/qemu-doc.texi b/qemu-doc.texi index 9216848af7..e2acac8512 100644 --- a/qemu-doc.texi +++ b/qemu-doc.texi @@ -714,20 +714,12 @@ state is not saved or restored properly (in particular USB). @node pcsys_network @section Network emulation -QEMU can simulate several network cards (PCI or ISA cards on the PC -target) and can connect them to an arbitrary number of Virtual Local -Area Networks (VLANs). Host TAP devices can be connected to any QEMU -VLAN. VLAN can be connected between separate instances of QEMU to -simulate large networks. For simpler usage, a non privileged user mode -network stack can replace the TAP device to have a basic network -connection. - -@subsection VLANs - -QEMU simulates several VLANs. A VLAN can be symbolised as a virtual -connection between several network devices. These devices can be for -example QEMU virtual Ethernet cards or virtual Host ethernet devices -(TAP devices). +QEMU can simulate several network cards (e.g. PCI or ISA cards on the PC +target) and can connect them to a network backend on the host or an emulated +hub. The various host network backends can either be used to connect the NIC of +the guest to a real network (e.g. by using a TAP devices or the non-privileged +user mode network stack), or to other guest instances running in another QEMU +process (e.g. by using the socket host network backend). @subsection Using TAP network interfaces @@ -763,7 +755,7 @@ network). The virtual network configuration is the following: @example - QEMU VLAN <------> Firewall/DHCP server <-----> Internet + guest (10.0.2.15) <------> Firewall/DHCP server <-----> Internet | (10.0.2.2) | ----> DNS server (10.0.2.3) @@ -798,11 +790,23 @@ When using the @option{'-netdev user,hostfwd=...'} option, TCP or UDP connections can be redirected from the host to the guest. It allows for example to redirect X11, telnet or SSH connections. -@subsection Connecting VLANs between QEMU instances +@subsection Hubs -Using the @option{-net socket} option, it is possible to make VLANs -that span several QEMU instances. See @ref{sec_invocation} to have a -basic example. +QEMU can simulate several hubs. A hub can be thought of as a virtual connection +between several network devices. These devices can be for example QEMU virtual +ethernet cards or virtual Host ethernet devices (TAP devices). You can connect +guest NICs or host network backends to such a hub using the @option{-netdev +hubport} or @option{-nic hubport} options. The legacy @option{-net} option +also connects the given device to the emulated hub with ID 0 (i.e. the default +hub) unless you specify a netdev with @option{-net nic,netdev=xxx} here. + +@subsection Connecting emulated networks between QEMU instances + +Using the @option{-netdev socket} (or @option{-nic socket} or +@option{-net socket}) option, it is possible to create emulated +networks that span several QEMU instances. +See the description of the @option{-netdev socket} option in the +@ref{sec_invocation,,Invocation chapter} to have a basic example. @node pcsys_other_devs @section Other Devices