Yang Hongyang <yan...@cn.fujitsu.com> writes: > Add a netfilter object based on QOM. > > A netfilter is attached to a netdev, captures all network packets > that pass through the netdev. When we delete the netdev, we also > delete the netfilter object attached to it, because if the netdev is > removed, the filter which attached to it is useless. > > QTAILQ_ENTRY next used by netdev, filter belongs to the specific netdev is > in this queue.
I'm afraid this paragraph is incomprehensible. What are you trying to say? > Signed-off-by: Yang Hongyang <yan...@cn.fujitsu.com> > --- > include/net/filter.h | 62 ++++++++++++++++++++++ > include/net/net.h | 1 + > include/qemu/typedefs.h | 1 + > net/Makefile.objs | 1 + > net/filter.c | 138 > ++++++++++++++++++++++++++++++++++++++++++++++++ > net/net.c | 7 +++ > qapi-schema.json | 19 +++++++ > 7 files changed, 229 insertions(+) > create mode 100644 include/net/filter.h > create mode 100644 net/filter.c > > diff --git a/include/net/filter.h b/include/net/filter.h > new file mode 100644 > index 0000000..e3e14ea > --- /dev/null > +++ b/include/net/filter.h > @@ -0,0 +1,62 @@ > +/* > + * Copyright (c) 2015 FUJITSU LIMITED > + * Author: Yang Hongyang <yan...@cn.fujitsu.com> > + * > + * This work is licensed under the terms of the GNU GPL, version 2 or > + * later. See the COPYING file in the top-level directory. > + */ > + > +#ifndef QEMU_NET_FILTER_H > +#define QEMU_NET_FILTER_H > + > +#include "qom/object.h" > +#include "qemu-common.h" > +#include "qemu/typedefs.h" > +#include "net/queue.h" > + > +#define TYPE_NETFILTER "netfilter" > +#define NETFILTER(obj) \ > + OBJECT_CHECK(NetFilterState, (obj), TYPE_NETFILTER) > +#define NETFILTER_GET_CLASS(obj) \ > + OBJECT_GET_CLASS(NetFilterClass, (obj), TYPE_NETFILTER) > +#define NETFILTER_CLASS(klass) \ > + OBJECT_CLASS_CHECK(NetFilterClass, (klass), TYPE_NETFILTER) > + > +typedef void (FilterSetup) (NetFilterState *nf, Error **errp); > +typedef void (FilterCleanup) (NetFilterState *nf); > +/* > + * Return: > + * 0: finished handling the packet, we should continue > + * size: filter stolen this packet, we stop pass this packet further > + */ > +typedef ssize_t (FilterReceiveIOV)(NetFilterState *nc, > + NetClientState *sender, > + unsigned flags, > + const struct iovec *iov, > + int iovcnt, > + NetPacketSent *sent_cb); > + > +struct NetFilterClass { > + ObjectClass parent_class; > + > + /* optional */ > + FilterSetup *setup; > + FilterCleanup *cleanup; > + /* mandatory */ > + FilterReceiveIOV *receive_iov; > +}; > +typedef struct NetFilterClass NetFilterClass; No separate typedef, please. > + > + > +struct NetFilterState { > + /* private */ > + Object parent; > + > + /* protected */ > + char *netdev_id; > + NetClientState *netdev; > + NetFilterDirection direction; > + QTAILQ_ENTRY(NetFilterState) next; > +}; > + > +#endif /* QEMU_NET_FILTER_H */ > diff --git a/include/net/net.h b/include/net/net.h > index 6a6cbef..36e5fab 100644 > --- a/include/net/net.h > +++ b/include/net/net.h > @@ -92,6 +92,7 @@ struct NetClientState { > NetClientDestructor *destructor; > unsigned int queue_index; > unsigned rxfilter_notify_enabled:1; > + QTAILQ_HEAD(, NetFilterState) filters; > }; > > typedef struct NICState { > diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h > index 3a835ff..ee1ce1d 100644 > --- a/include/qemu/typedefs.h > +++ b/include/qemu/typedefs.h > @@ -45,6 +45,7 @@ typedef struct Monitor Monitor; > typedef struct MouseTransformInfo MouseTransformInfo; > typedef struct MSIMessage MSIMessage; > typedef struct NetClientState NetClientState; > +typedef struct NetFilterState NetFilterState; > typedef struct NICInfo NICInfo; > typedef struct PcGuestInfo PcGuestInfo; > typedef struct PCIBridge PCIBridge; > diff --git a/net/Makefile.objs b/net/Makefile.objs > index ec19cb3..914aec0 100644 > --- a/net/Makefile.objs > +++ b/net/Makefile.objs > @@ -13,3 +13,4 @@ common-obj-$(CONFIG_HAIKU) += tap-haiku.o > common-obj-$(CONFIG_SLIRP) += slirp.o > common-obj-$(CONFIG_VDE) += vde.o > common-obj-$(CONFIG_NETMAP) += netmap.o > +common-obj-y += filter.o > diff --git a/net/filter.c b/net/filter.c > new file mode 100644 > index 0000000..34e32cd > --- /dev/null > +++ b/net/filter.c > @@ -0,0 +1,138 @@ > +/* > + * Copyright (c) 2015 FUJITSU LIMITED > + * Author: Yang Hongyang <yan...@cn.fujitsu.com> > + * > + * This work is licensed under the terms of the GNU GPL, version 2 or > + * later. See the COPYING file in the top-level directory. > + */ > + > +#include "qemu-common.h" > +#include "qapi/qmp/qerror.h" > +#include "qemu/error-report.h" > + > +#include "net/filter.h" > +#include "net/net.h" > +#include "net/vhost_net.h" > +#include "qom/object_interfaces.h" > + > +static char *netfilter_get_netdev_id(Object *obj, Error **errp) > +{ > + NetFilterState *nf = NETFILTER(obj); > + > + return g_strdup(nf->netdev_id); > +} > + > +static void netfilter_set_netdev_id(Object *obj, const char *str, Error > **errp) > +{ > + NetFilterState *nf = NETFILTER(obj); > + > + nf->netdev_id = g_strdup(str); > +} > + > +static int netfilter_get_direction(Object *obj, Error **errp G_GNUC_UNUSED) > +{ > + NetFilterState *nf = NETFILTER(obj); > + return nf->direction; > +} > + > +static void netfilter_set_direction(Object *obj, int direction, Error **errp) > +{ > + NetFilterState *nf = NETFILTER(obj); > + nf->direction = direction; > +} > + > +static void netfilter_init(Object *obj) > +{ > + object_property_add_str(obj, "netdev", > + netfilter_get_netdev_id, netfilter_set_netdev_id, > + NULL); > + object_property_add_enum(obj, "queue", "NetFilterDirection", > + NetFilterDirection_lookup, > + netfilter_get_direction, > netfilter_set_direction, > + NULL); > +} > + > +static void netfilter_finalize(Object *obj) > +{ > + NetFilterState *nf = NETFILTER(obj); > + NetFilterClass *nfc = NETFILTER_GET_CLASS(obj); > + > + if (nfc->cleanup) { > + nfc->cleanup(nf); > + } > + > + if (nf->netdev && !QTAILQ_EMPTY(&nf->netdev->filters)) { > + QTAILQ_REMOVE(&nf->netdev->filters, nf, next); > + } > +} I still recommend to put netfilter_finalize() after netfilter_complete(), because that's how we order creation and destruction elsewhere. > + > +static void netfilter_complete(UserCreatable *uc, Error **errp) > +{ > + NetFilterState *nf = NETFILTER(uc); > + NetClientState *ncs[MAX_QUEUE_NUM]; > + NetFilterClass *nfc = NETFILTER_GET_CLASS(uc); > + int queues; > + Error *local_err = NULL; > + > + if (!nf->netdev_id) { > + error_setg(errp, "Parameter 'netdev' is required"); > + return; > + } > + > + queues = qemu_find_net_clients_except(nf->netdev_id, ncs, > + NET_CLIENT_OPTIONS_KIND_NIC, > + MAX_QUEUE_NUM); > + if (queues < 1) { > + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "netdev", > + "a network backend id"); > + return; > + } else if (queues > 1) { > + error_setg(errp, "multiqueue is not supported"); > + return; > + } > + > + if (get_vhost_net(ncs[0])) { > + error_setg(errp, "Vhost is not supported"); > + return; > + } > + > + nf->netdev = ncs[0]; > + > + if (nfc->setup) { > + nfc->setup(nf, &local_err); > + if (local_err) { > + error_propagate(errp, local_err); > + return; > + } > + } > + QTAILQ_INSERT_TAIL(&nf->netdev->filters, nf, next); > +} > + > +static void netfilter_class_init(ObjectClass *oc, void *data) > +{ > + UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc); > + > + ucc->complete = netfilter_complete; > +} > + > +static const TypeInfo netfilter_info = { > + .name = TYPE_NETFILTER, > + .parent = TYPE_OBJECT, > + .abstract = true, > + .class_size = sizeof(NetFilterClass), > + .class_init = netfilter_class_init, > + .instance_size = sizeof(NetFilterState), > + .instance_init = netfilter_init, > + .instance_finalize = netfilter_finalize, > + .interfaces = (InterfaceInfo[]) { > + { TYPE_USER_CREATABLE }, > + { } > + } > +}; > + > +static void register_types(void) > +{ > + type_register_static(&netfilter_info); > +} > + > +type_init(register_types); > diff --git a/net/net.c b/net/net.c > index 28a5597..033f4f3 100644 > --- a/net/net.c > +++ b/net/net.c > @@ -44,6 +44,7 @@ > #include "qapi/opts-visitor.h" > #include "qapi/dealloc-visitor.h" > #include "sysemu/sysemu.h" > +#include "net/filter.h" > > /* Net bridge is currently not supported for W32. */ > #if !defined(_WIN32) > @@ -287,6 +288,7 @@ static void qemu_net_client_setup(NetClientState *nc, > > nc->incoming_queue = qemu_new_net_queue(nc); > nc->destructor = destructor; > + QTAILQ_INIT(&nc->filters); > } > > NetClientState *qemu_new_net_client(NetClientInfo *info, > @@ -384,6 +386,7 @@ void qemu_del_net_client(NetClientState *nc) > { > NetClientState *ncs[MAX_QUEUE_NUM]; > int queues, i; > + NetFilterState *nf, *next; > > assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC); > > @@ -395,6 +398,10 @@ void qemu_del_net_client(NetClientState *nc) > MAX_QUEUE_NUM); > assert(queues != 0); > > + QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { > + object_unparent(OBJECT(nf)); > + } > + > /* If there is a peer NIC, delete and cleanup client, but do not free. */ > if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { > NICState *nic = qemu_get_nic(nc->peer); > diff --git a/qapi-schema.json b/qapi-schema.json > index 582a817..a58e8f4 100644 > --- a/qapi-schema.json > +++ b/qapi-schema.json > @@ -2556,6 +2556,25 @@ > 'opts': 'NetClientOptions' } } > > ## > +# @NetFilterDirection > +# > +# Indicates whether a netfilter is attached to a netdev's transmit queue or > +# receive queue or both. > +# > +# @all: the filter will receive packets both sent to/by the netdev (default). Make this @all: the filter is attached both to the receive and the transmit queue of the netdev. > +# > +# @rx: the filter is attached to the receive queue of the netdev, > +# will receive packets sent to the netdev. > +# > +# @tx: the filter is attached to the transmit queue of the netdev, > +# will receive packets sent by the netdev. > +# > +# Since 2.5 > +## > +{ 'enum': 'NetFilterDirection', > + 'data': [ 'all', 'rx', 'tx' ] } > + > +## > # @InetSocketAddress > # > # Captures a socket address or address range in the Internet namespace.