scsi: esp: check buffer length before reading scsi command
[qemu.git] / net / vhost-user.c
1 /*
2 * vhost-user.c
3 *
4 * Copyright (c) 2013 Virtual Open Systems Sarl.
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
8 *
9 */
10
11 #include "qemu/osdep.h"
12 #include "clients.h"
13 #include "net/vhost_net.h"
14 #include "net/vhost-user.h"
15 #include "sysemu/char.h"
16 #include "qemu/config-file.h"
17 #include "qemu/error-report.h"
18 #include "qmp-commands.h"
19 #include "trace.h"
20
21 typedef struct VhostUserState {
22 NetClientState nc;
23 CharDriverState *chr;
24 VHostNetState *vhost_net;
25 } VhostUserState;
26
27 typedef struct VhostUserChardevProps {
28 bool is_socket;
29 bool is_unix;
30 } VhostUserChardevProps;
31
32 VHostNetState *vhost_user_get_vhost_net(NetClientState *nc)
33 {
34 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
35 assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
36 return s->vhost_net;
37 }
38
39 static int vhost_user_running(VhostUserState *s)
40 {
41 return (s->vhost_net) ? 1 : 0;
42 }
43
44 static void vhost_user_stop(int queues, NetClientState *ncs[])
45 {
46 VhostUserState *s;
47 int i;
48
49 for (i = 0; i < queues; i++) {
50 assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
51
52 s = DO_UPCAST(VhostUserState, nc, ncs[i]);
53 if (!vhost_user_running(s)) {
54 continue;
55 }
56
57 if (s->vhost_net) {
58 vhost_net_cleanup(s->vhost_net);
59 s->vhost_net = NULL;
60 }
61 }
62 }
63
64 static int vhost_user_start(int queues, NetClientState *ncs[])
65 {
66 VhostNetOptions options;
67 VhostUserState *s;
68 int max_queues;
69 int i;
70
71 options.backend_type = VHOST_BACKEND_TYPE_USER;
72
73 for (i = 0; i < queues; i++) {
74 assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
75
76 s = DO_UPCAST(VhostUserState, nc, ncs[i]);
77 if (vhost_user_running(s)) {
78 continue;
79 }
80
81 options.net_backend = ncs[i];
82 options.opaque = s->chr;
83 s->vhost_net = vhost_net_init(&options);
84 if (!s->vhost_net) {
85 error_report("failed to init vhost_net for queue %d", i);
86 goto err;
87 }
88
89 if (i == 0) {
90 max_queues = vhost_net_get_max_queues(s->vhost_net);
91 if (queues > max_queues) {
92 error_report("you are asking more queues than supported: %d",
93 max_queues);
94 goto err;
95 }
96 }
97 }
98
99 return 0;
100
101 err:
102 vhost_user_stop(i + 1, ncs);
103 return -1;
104 }
105
106 static ssize_t vhost_user_receive(NetClientState *nc, const uint8_t *buf,
107 size_t size)
108 {
109 /* In case of RARP (message size is 60) notify backup to send a fake RARP.
110 This fake RARP will be sent by backend only for guest
111 without GUEST_ANNOUNCE capability.
112 */
113 if (size == 60) {
114 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
115 int r;
116 static int display_rarp_failure = 1;
117 char mac_addr[6];
118
119 /* extract guest mac address from the RARP message */
120 memcpy(mac_addr, &buf[6], 6);
121
122 r = vhost_net_notify_migration_done(s->vhost_net, mac_addr);
123
124 if ((r != 0) && (display_rarp_failure)) {
125 fprintf(stderr,
126 "Vhost user backend fails to broadcast fake RARP\n");
127 fflush(stderr);
128 display_rarp_failure = 0;
129 }
130 }
131
132 return size;
133 }
134
135 static void vhost_user_cleanup(NetClientState *nc)
136 {
137 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
138
139 if (s->vhost_net) {
140 vhost_net_cleanup(s->vhost_net);
141 s->vhost_net = NULL;
142 }
143
144 qemu_purge_queued_packets(nc);
145 }
146
147 static bool vhost_user_has_vnet_hdr(NetClientState *nc)
148 {
149 assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
150
151 return true;
152 }
153
154 static bool vhost_user_has_ufo(NetClientState *nc)
155 {
156 assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
157
158 return true;
159 }
160
161 static NetClientInfo net_vhost_user_info = {
162 .type = NET_CLIENT_OPTIONS_KIND_VHOST_USER,
163 .size = sizeof(VhostUserState),
164 .receive = vhost_user_receive,
165 .cleanup = vhost_user_cleanup,
166 .has_vnet_hdr = vhost_user_has_vnet_hdr,
167 .has_ufo = vhost_user_has_ufo,
168 };
169
170 static void net_vhost_user_event(void *opaque, int event)
171 {
172 const char *name = opaque;
173 NetClientState *ncs[MAX_QUEUE_NUM];
174 VhostUserState *s;
175 Error *err = NULL;
176 int queues;
177
178 queues = qemu_find_net_clients_except(name, ncs,
179 NET_CLIENT_OPTIONS_KIND_NIC,
180 MAX_QUEUE_NUM);
181 assert(queues < MAX_QUEUE_NUM);
182
183 s = DO_UPCAST(VhostUserState, nc, ncs[0]);
184 trace_vhost_user_event(s->chr->label, event);
185 switch (event) {
186 case CHR_EVENT_OPENED:
187 if (vhost_user_start(queues, ncs) < 0) {
188 exit(1);
189 }
190 qmp_set_link(name, true, &err);
191 break;
192 case CHR_EVENT_CLOSED:
193 qmp_set_link(name, false, &err);
194 vhost_user_stop(queues, ncs);
195 break;
196 }
197
198 if (err) {
199 error_report_err(err);
200 }
201 }
202
203 static int net_vhost_user_init(NetClientState *peer, const char *device,
204 const char *name, CharDriverState *chr,
205 int queues)
206 {
207 NetClientState *nc;
208 VhostUserState *s;
209 int i;
210
211 assert(name);
212 assert(queues > 0);
213
214 for (i = 0; i < queues; i++) {
215 nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name);
216
217 snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s",
218 i, chr->label);
219
220 nc->queue_index = i;
221
222 s = DO_UPCAST(VhostUserState, nc, nc);
223 s->chr = chr;
224 }
225
226 qemu_chr_add_handlers(chr, NULL, NULL, net_vhost_user_event, nc[0].name);
227
228 return 0;
229 }
230
231 static int net_vhost_chardev_opts(void *opaque,
232 const char *name, const char *value,
233 Error **errp)
234 {
235 VhostUserChardevProps *props = opaque;
236
237 if (strcmp(name, "backend") == 0 && strcmp(value, "socket") == 0) {
238 props->is_socket = true;
239 } else if (strcmp(name, "path") == 0) {
240 props->is_unix = true;
241 } else if (strcmp(name, "server") == 0) {
242 } else {
243 error_setg(errp,
244 "vhost-user does not support a chardev with option %s=%s",
245 name, value);
246 return -1;
247 }
248 return 0;
249 }
250
251 static CharDriverState *net_vhost_parse_chardev(
252 const NetdevVhostUserOptions *opts, Error **errp)
253 {
254 CharDriverState *chr = qemu_chr_find(opts->chardev);
255 VhostUserChardevProps props;
256
257 if (chr == NULL) {
258 error_setg(errp, "chardev \"%s\" not found", opts->chardev);
259 return NULL;
260 }
261
262 /* inspect chardev opts */
263 memset(&props, 0, sizeof(props));
264 if (qemu_opt_foreach(chr->opts, net_vhost_chardev_opts, &props, errp)) {
265 return NULL;
266 }
267
268 if (!props.is_socket || !props.is_unix) {
269 error_setg(errp, "chardev \"%s\" is not a unix socket",
270 opts->chardev);
271 return NULL;
272 }
273
274 qemu_chr_fe_claim_no_fail(chr);
275
276 return chr;
277 }
278
279 static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
280 {
281 const char *name = opaque;
282 const char *driver, *netdev;
283 const char virtio_name[] = "virtio-net-";
284
285 driver = qemu_opt_get(opts, "driver");
286 netdev = qemu_opt_get(opts, "netdev");
287
288 if (!driver || !netdev) {
289 return 0;
290 }
291
292 if (strcmp(netdev, name) == 0 &&
293 strncmp(driver, virtio_name, strlen(virtio_name)) != 0) {
294 error_setg(errp, "vhost-user requires frontend driver virtio-net-*");
295 return -1;
296 }
297
298 return 0;
299 }
300
301 int net_init_vhost_user(const NetClientOptions *opts, const char *name,
302 NetClientState *peer, Error **errp)
303 {
304 int queues;
305 const NetdevVhostUserOptions *vhost_user_opts;
306 CharDriverState *chr;
307
308 assert(opts->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
309 vhost_user_opts = opts->u.vhost_user.data;
310
311 chr = net_vhost_parse_chardev(vhost_user_opts, errp);
312 if (!chr) {
313 return -1;
314 }
315
316 /* verify net frontend */
317 if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
318 (char *)name, errp)) {
319 return -1;
320 }
321
322 queues = vhost_user_opts->has_queues ? vhost_user_opts->queues : 1;
323 if (queues < 1 || queues > MAX_QUEUE_NUM) {
324 error_setg(errp,
325 "vhost-user number of queues must be in range [1, %d]",
326 MAX_QUEUE_NUM);
327 return -1;
328 }
329
330 return net_vhost_user_init(peer, "vhost_user", name, chr, queues);
331 }