| /* |
| * Copyright (c) 2015 FUJITSU LIMITED |
| * Author: Yang Hongyang <yanghy@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" |
| #include "qemu/iov.h" |
| #include "qapi/string-output-visitor.h" |
| |
| ssize_t qemu_netfilter_receive(NetFilterState *nf, |
| NetFilterDirection direction, |
| NetClientState *sender, |
| unsigned flags, |
| const struct iovec *iov, |
| int iovcnt, |
| NetPacketSent *sent_cb) |
| { |
| if (nf->direction == direction || |
| nf->direction == NET_FILTER_DIRECTION_ALL) { |
| return NETFILTER_GET_CLASS(OBJECT(nf))->receive_iov( |
| nf, sender, flags, iov, iovcnt, sent_cb); |
| } |
| |
| return 0; |
| } |
| |
| ssize_t qemu_netfilter_pass_to_next(NetClientState *sender, |
| unsigned flags, |
| const struct iovec *iov, |
| int iovcnt, |
| void *opaque) |
| { |
| int ret = 0; |
| int direction; |
| NetFilterState *nf = opaque; |
| NetFilterState *next = QTAILQ_NEXT(nf, next); |
| |
| if (!sender || !sender->peer) { |
| /* no receiver, or sender been deleted, no need to pass it further */ |
| goto out; |
| } |
| |
| if (nf->direction == NET_FILTER_DIRECTION_ALL) { |
| if (sender == nf->netdev) { |
| /* This packet is sent by netdev itself */ |
| direction = NET_FILTER_DIRECTION_TX; |
| } else { |
| direction = NET_FILTER_DIRECTION_RX; |
| } |
| } else { |
| direction = nf->direction; |
| } |
| |
| while (next) { |
| /* |
| * if qemu_netfilter_pass_to_next been called, means that |
| * the packet has been hold by filter and has already retured size |
| * to the sender, so sent_cb shouldn't be called later, just |
| * pass NULL to next. |
| */ |
| ret = qemu_netfilter_receive(next, direction, sender, flags, iov, |
| iovcnt, NULL); |
| if (ret) { |
| return ret; |
| } |
| next = QTAILQ_NEXT(next, next); |
| } |
| |
| /* |
| * We have gone through all filters, pass it to receiver. |
| * Do the valid check again incase sender or receiver been |
| * deleted while we go through filters. |
| */ |
| if (sender && sender->peer) { |
| qemu_net_queue_send_iov(sender->peer->incoming_queue, |
| sender, flags, iov, iovcnt, NULL); |
| } |
| |
| out: |
| /* no receiver, or sender been deleted */ |
| return iov_size(iov, iovcnt); |
| } |
| |
| 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_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; |
| char *str, *info; |
| ObjectProperty *prop; |
| ObjectPropertyIterator *iter; |
| StringOutputVisitor *ov; |
| |
| 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); |
| |
| /* generate info str */ |
| iter = object_property_iter_init(OBJECT(nf)); |
| while ((prop = object_property_iter_next(iter))) { |
| if (!strcmp(prop->name, "type")) { |
| continue; |
| } |
| ov = string_output_visitor_new(false); |
| object_property_get(OBJECT(nf), string_output_get_visitor(ov), |
| prop->name, errp); |
| str = string_output_get_string(ov); |
| string_output_visitor_cleanup(ov); |
| info = g_strdup_printf(",%s=%s", prop->name, str); |
| g_strlcat(nf->info_str, info, sizeof(nf->info_str)); |
| g_free(str); |
| g_free(info); |
| } |
| object_property_iter_free(iter); |
| } |
| |
| 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); |
| } |
| } |
| |
| 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); |