2 * Copyright (c) 2015 FUJITSU LIMITED
3 * Author: Yang Hongyang <yanghy@cn.fujitsu.com>
5 * This work is licensed under the terms of the GNU GPL, version 2 or
6 * later. See the COPYING file in the top-level directory.
9 #include "qemu/osdep.h"
10 #include "qapi/error.h"
11 #include "qemu-common.h"
12 #include "qapi/qmp/qerror.h"
13 #include "qemu/error-report.h"
15 #include "net/filter.h"
17 #include "net/vhost_net.h"
18 #include "qom/object_interfaces.h"
21 static inline bool qemu_can_skip_netfilter(NetFilterState *nf)
26 ssize_t qemu_netfilter_receive(NetFilterState *nf,
27 NetFilterDirection direction,
28 NetClientState *sender,
30 const struct iovec *iov,
32 NetPacketSent *sent_cb)
34 if (qemu_can_skip_netfilter(nf)) {
37 if (nf->direction == direction ||
38 nf->direction == NET_FILTER_DIRECTION_ALL) {
39 return NETFILTER_GET_CLASS(OBJECT(nf))->receive_iov(
40 nf, sender, flags, iov, iovcnt, sent_cb);
46 static NetFilterState *netfilter_next(NetFilterState *nf,
47 NetFilterDirection dir)
51 if (dir == NET_FILTER_DIRECTION_TX) {
52 /* forward walk through filters */
53 next = QTAILQ_NEXT(nf, next);
56 next = QTAILQ_PREV(nf, NetFilterHead, next);
62 ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
64 const struct iovec *iov,
70 NetFilterState *nf = opaque;
71 NetFilterState *next = NULL;
73 if (!sender || !sender->peer) {
74 /* no receiver, or sender been deleted, no need to pass it further */
78 if (nf->direction == NET_FILTER_DIRECTION_ALL) {
79 if (sender == nf->netdev) {
80 /* This packet is sent by netdev itself */
81 direction = NET_FILTER_DIRECTION_TX;
83 direction = NET_FILTER_DIRECTION_RX;
86 direction = nf->direction;
89 next = netfilter_next(nf, direction);
92 * if qemu_netfilter_pass_to_next been called, means that
93 * the packet has been hold by filter and has already retured size
94 * to the sender, so sent_cb shouldn't be called later, just
97 ret = qemu_netfilter_receive(next, direction, sender, flags, iov,
102 next = netfilter_next(next, direction);
106 * We have gone through all filters, pass it to receiver.
107 * Do the valid check again incase sender or receiver been
108 * deleted while we go through filters.
110 if (sender && sender->peer) {
111 qemu_net_queue_send_iov(sender->peer->incoming_queue,
112 sender, flags, iov, iovcnt, NULL);
116 /* no receiver, or sender been deleted */
117 return iov_size(iov, iovcnt);
120 static char *netfilter_get_netdev_id(Object *obj, Error **errp)
122 NetFilterState *nf = NETFILTER(obj);
124 return g_strdup(nf->netdev_id);
127 static void netfilter_set_netdev_id(Object *obj, const char *str, Error **errp)
129 NetFilterState *nf = NETFILTER(obj);
131 nf->netdev_id = g_strdup(str);
134 static int netfilter_get_direction(Object *obj, Error **errp G_GNUC_UNUSED)
136 NetFilterState *nf = NETFILTER(obj);
137 return nf->direction;
140 static void netfilter_set_direction(Object *obj, int direction, Error **errp)
142 NetFilterState *nf = NETFILTER(obj);
143 nf->direction = direction;
146 static char *netfilter_get_status(Object *obj, Error **errp)
148 NetFilterState *nf = NETFILTER(obj);
150 return nf->on ? g_strdup("on") : g_strdup("off");
153 static void netfilter_set_status(Object *obj, const char *str, Error **errp)
155 NetFilterState *nf = NETFILTER(obj);
156 NetFilterClass *nfc = NETFILTER_GET_CLASS(obj);
158 if (strcmp(str, "on") && strcmp(str, "off")) {
159 error_setg(errp, "Invalid value for netfilter status, "
160 "should be 'on' or 'off'");
163 if (nf->on == !strcmp(str, "on")) {
167 if (nfc->status_changed) {
168 nfc->status_changed(nf, errp);
172 static void netfilter_init(Object *obj)
174 NetFilterState *nf = NETFILTER(obj);
178 object_property_add_str(obj, "netdev",
179 netfilter_get_netdev_id, netfilter_set_netdev_id,
181 object_property_add_enum(obj, "queue", "NetFilterDirection",
182 NetFilterDirection_lookup,
183 netfilter_get_direction, netfilter_set_direction,
185 object_property_add_str(obj, "status",
186 netfilter_get_status, netfilter_set_status,
190 static void netfilter_complete(UserCreatable *uc, Error **errp)
192 NetFilterState *nf = NETFILTER(uc);
193 NetClientState *ncs[MAX_QUEUE_NUM];
194 NetFilterClass *nfc = NETFILTER_GET_CLASS(uc);
196 Error *local_err = NULL;
198 if (!nf->netdev_id) {
199 error_setg(errp, "Parameter 'netdev' is required");
203 queues = qemu_find_net_clients_except(nf->netdev_id, ncs,
204 NET_CLIENT_OPTIONS_KIND_NIC,
207 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "netdev",
208 "a network backend id");
210 } else if (queues > 1) {
211 error_setg(errp, "multiqueue is not supported");
215 if (get_vhost_net(ncs[0])) {
216 error_setg(errp, "Vhost is not supported");
223 nfc->setup(nf, &local_err);
225 error_propagate(errp, local_err);
229 QTAILQ_INSERT_TAIL(&nf->netdev->filters, nf, next);
232 static void netfilter_finalize(Object *obj)
234 NetFilterState *nf = NETFILTER(obj);
235 NetFilterClass *nfc = NETFILTER_GET_CLASS(obj);
241 if (nf->netdev && !QTAILQ_EMPTY(&nf->netdev->filters) &&
243 QTAILQ_REMOVE(&nf->netdev->filters, nf, next);
245 g_free(nf->netdev_id);
248 static void netfilter_class_init(ObjectClass *oc, void *data)
250 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
252 ucc->complete = netfilter_complete;
255 static const TypeInfo netfilter_info = {
256 .name = TYPE_NETFILTER,
257 .parent = TYPE_OBJECT,
259 .class_size = sizeof(NetFilterClass),
260 .class_init = netfilter_class_init,
261 .instance_size = sizeof(NetFilterState),
262 .instance_init = netfilter_init,
263 .instance_finalize = netfilter_finalize,
264 .interfaces = (InterfaceInfo[]) {
265 { TYPE_USER_CREATABLE },
270 static void register_types(void)
272 type_register_static(&netfilter_info);
275 type_init(register_types);