1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25#include "qemu/osdep.h"
26#include "qemu/log.h"
27#include "net/slirp.h"
28
29
30#if defined(CONFIG_SMBD_COMMAND)
31#include <pwd.h>
32#include <sys/wait.h>
33#endif
34#include "net/eth.h"
35#include "net/net.h"
36#include "clients.h"
37#include "hub.h"
38#include "monitor/monitor.h"
39#include "qemu/error-report.h"
40#include "qemu/sockets.h"
41#include <libslirp.h>
42#include "chardev/char-fe.h"
43#include "sysemu/sysemu.h"
44#include "qemu/cutils.h"
45#include "qapi/error.h"
46#include "qapi/qmp/qdict.h"
47#include "util.h"
48#include "migration/register.h"
49#include "migration/qemu-file-types.h"
50
51static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
52{
53 const char *p, *p1;
54 int len;
55 p = *pp;
56 p1 = strchr(p, sep);
57 if (!p1)
58 return -1;
59 len = p1 - p;
60 p1++;
61 if (buf_size > 0) {
62 if (len > buf_size - 1)
63 len = buf_size - 1;
64 memcpy(buf, p, len);
65 buf[len] = '\0';
66 }
67 *pp = p1;
68 return 0;
69}
70
71
72
73#define SLIRP_CFG_HOSTFWD 1
74
75struct slirp_config_str {
76 struct slirp_config_str *next;
77 int flags;
78 char str[1024];
79};
80
81struct GuestFwd {
82 CharBackend hd;
83 struct in_addr server;
84 int port;
85 Slirp *slirp;
86};
87
88typedef struct SlirpState {
89 NetClientState nc;
90 QTAILQ_ENTRY(SlirpState) entry;
91 Slirp *slirp;
92 Notifier poll_notifier;
93 Notifier exit_notifier;
94#if defined(CONFIG_SMBD_COMMAND)
95 gchar *smb_dir;
96#endif
97 GSList *fwd;
98} SlirpState;
99
100static struct slirp_config_str *slirp_configs;
101static QTAILQ_HEAD(, SlirpState) slirp_stacks =
102 QTAILQ_HEAD_INITIALIZER(slirp_stacks);
103
104static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
105static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
106
107#if defined(CONFIG_SMBD_COMMAND)
108static int slirp_smb(SlirpState *s, const char *exported_dir,
109 struct in_addr vserver_addr, Error **errp);
110static void slirp_smb_cleanup(SlirpState *s);
111#else
112static inline void slirp_smb_cleanup(SlirpState *s) { }
113#endif
114
115static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len,
116 void *opaque)
117{
118 SlirpState *s = opaque;
119 uint8_t min_pkt[ETH_ZLEN];
120 size_t min_pktsz = sizeof(min_pkt);
121
122 if (net_peer_needs_padding(&s->nc)) {
123 if (eth_pad_short_frame(min_pkt, &min_pktsz, pkt, pkt_len)) {
124 pkt = min_pkt;
125 pkt_len = min_pktsz;
126 }
127 }
128
129 return qemu_send_packet(&s->nc, pkt, pkt_len);
130}
131
132static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
133{
134 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
135
136 slirp_input(s->slirp, buf, size);
137
138 return size;
139}
140
141static void slirp_smb_exit(Notifier *n, void *data)
142{
143 SlirpState *s = container_of(n, SlirpState, exit_notifier);
144 slirp_smb_cleanup(s);
145}
146
147static void slirp_free_fwd(gpointer data)
148{
149 struct GuestFwd *fwd = data;
150
151 qemu_chr_fe_deinit(&fwd->hd, true);
152 g_free(data);
153}
154
155static void net_slirp_cleanup(NetClientState *nc)
156{
157 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
158
159 g_slist_free_full(s->fwd, slirp_free_fwd);
160 main_loop_poll_remove_notifier(&s->poll_notifier);
161 unregister_savevm(NULL, "slirp", s->slirp);
162 slirp_cleanup(s->slirp);
163 if (s->exit_notifier.notify) {
164 qemu_remove_exit_notifier(&s->exit_notifier);
165 }
166 slirp_smb_cleanup(s);
167 QTAILQ_REMOVE(&slirp_stacks, s, entry);
168}
169
170static NetClientInfo net_slirp_info = {
171 .type = NET_CLIENT_DRIVER_USER,
172 .size = sizeof(SlirpState),
173 .receive = net_slirp_receive,
174 .cleanup = net_slirp_cleanup,
175};
176
177static void net_slirp_guest_error(const char *msg, void *opaque)
178{
179 qemu_log_mask(LOG_GUEST_ERROR, "%s", msg);
180}
181
182static int64_t net_slirp_clock_get_ns(void *opaque)
183{
184 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
185}
186
187typedef struct SlirpTimer SlirpTimer;
188struct SlirpTimer {
189 QEMUTimer timer;
190#if SLIRP_CHECK_VERSION(4,7,0)
191 Slirp *slirp;
192 SlirpTimerId id;
193 void *cb_opaque;
194#endif
195};
196
197#if SLIRP_CHECK_VERSION(4,7,0)
198static void net_slirp_init_completed(Slirp *slirp, void *opaque)
199{
200 SlirpState *s = opaque;
201 s->slirp = slirp;
202}
203
204static void net_slirp_timer_cb(void *opaque)
205{
206 SlirpTimer *t = opaque;
207 slirp_handle_timer(t->slirp, t->id, t->cb_opaque);
208}
209
210static void *net_slirp_timer_new_opaque(SlirpTimerId id,
211 void *cb_opaque, void *opaque)
212{
213 SlirpState *s = opaque;
214 SlirpTimer *t = g_new(SlirpTimer, 1);
215 t->slirp = s->slirp;
216 t->id = id;
217 t->cb_opaque = cb_opaque;
218 timer_init_full(&t->timer, NULL, QEMU_CLOCK_VIRTUAL,
219 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL,
220 net_slirp_timer_cb, t);
221 return t;
222}
223#else
224static void *net_slirp_timer_new(SlirpTimerCb cb,
225 void *cb_opaque, void *opaque)
226{
227 SlirpTimer *t = g_new(SlirpTimer, 1);
228 timer_init_full(&t->timer, NULL, QEMU_CLOCK_VIRTUAL,
229 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL,
230 cb, cb_opaque);
231 return t;
232}
233#endif
234
235static void net_slirp_timer_free(void *timer, void *opaque)
236{
237 SlirpTimer *t = timer;
238 timer_del(&t->timer);
239 g_free(t);
240}
241
242static void net_slirp_timer_mod(void *timer, int64_t expire_timer,
243 void *opaque)
244{
245 SlirpTimer *t = timer;
246 timer_mod(&t->timer, expire_timer);
247}
248
249static void net_slirp_register_poll_fd(int fd, void *opaque)
250{
251 qemu_fd_register(fd);
252}
253
254static void net_slirp_unregister_poll_fd(int fd, void *opaque)
255{
256
257}
258
259static void net_slirp_notify(void *opaque)
260{
261 qemu_notify_event();
262}
263
264static const SlirpCb slirp_cb = {
265 .send_packet = net_slirp_send_packet,
266 .guest_error = net_slirp_guest_error,
267 .clock_get_ns = net_slirp_clock_get_ns,
268#if SLIRP_CHECK_VERSION(4,7,0)
269 .init_completed = net_slirp_init_completed,
270 .timer_new_opaque = net_slirp_timer_new_opaque,
271#else
272 .timer_new = net_slirp_timer_new,
273#endif
274 .timer_free = net_slirp_timer_free,
275 .timer_mod = net_slirp_timer_mod,
276 .register_poll_fd = net_slirp_register_poll_fd,
277 .unregister_poll_fd = net_slirp_unregister_poll_fd,
278 .notify = net_slirp_notify,
279};
280
281static int slirp_poll_to_gio(int events)
282{
283 int ret = 0;
284
285 if (events & SLIRP_POLL_IN) {
286 ret |= G_IO_IN;
287 }
288 if (events & SLIRP_POLL_OUT) {
289 ret |= G_IO_OUT;
290 }
291 if (events & SLIRP_POLL_PRI) {
292 ret |= G_IO_PRI;
293 }
294 if (events & SLIRP_POLL_ERR) {
295 ret |= G_IO_ERR;
296 }
297 if (events & SLIRP_POLL_HUP) {
298 ret |= G_IO_HUP;
299 }
300
301 return ret;
302}
303
304static int net_slirp_add_poll(int fd, int events, void *opaque)
305{
306 GArray *pollfds = opaque;
307 GPollFD pfd = {
308 .fd = fd,
309 .events = slirp_poll_to_gio(events),
310 };
311 int idx = pollfds->len;
312 g_array_append_val(pollfds, pfd);
313 return idx;
314}
315
316static int slirp_gio_to_poll(int events)
317{
318 int ret = 0;
319
320 if (events & G_IO_IN) {
321 ret |= SLIRP_POLL_IN;
322 }
323 if (events & G_IO_OUT) {
324 ret |= SLIRP_POLL_OUT;
325 }
326 if (events & G_IO_PRI) {
327 ret |= SLIRP_POLL_PRI;
328 }
329 if (events & G_IO_ERR) {
330 ret |= SLIRP_POLL_ERR;
331 }
332 if (events & G_IO_HUP) {
333 ret |= SLIRP_POLL_HUP;
334 }
335
336 return ret;
337}
338
339static int net_slirp_get_revents(int idx, void *opaque)
340{
341 GArray *pollfds = opaque;
342
343 return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents);
344}
345
346static void net_slirp_poll_notify(Notifier *notifier, void *data)
347{
348 MainLoopPoll *poll = data;
349 SlirpState *s = container_of(notifier, SlirpState, poll_notifier);
350
351 switch (poll->state) {
352 case MAIN_LOOP_POLL_FILL:
353 slirp_pollfds_fill(s->slirp, &poll->timeout,
354 net_slirp_add_poll, poll->pollfds);
355 break;
356 case MAIN_LOOP_POLL_OK:
357 case MAIN_LOOP_POLL_ERR:
358 slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR,
359 net_slirp_get_revents, poll->pollfds);
360 break;
361 default:
362 g_assert_not_reached();
363 }
364}
365
366static ssize_t
367net_slirp_stream_read(void *buf, size_t size, void *opaque)
368{
369 QEMUFile *f = opaque;
370
371 return qemu_get_buffer(f, buf, size);
372}
373
374static ssize_t
375net_slirp_stream_write(const void *buf, size_t size, void *opaque)
376{
377 QEMUFile *f = opaque;
378
379 qemu_put_buffer(f, buf, size);
380 if (qemu_file_get_error(f)) {
381 return -1;
382 }
383
384 return size;
385}
386
387static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id)
388{
389 Slirp *slirp = opaque;
390
391 return slirp_state_load(slirp, version_id, net_slirp_stream_read, f);
392}
393
394static void net_slirp_state_save(QEMUFile *f, void *opaque)
395{
396 Slirp *slirp = opaque;
397
398 slirp_state_save(slirp, net_slirp_stream_write, f);
399}
400
401static SaveVMHandlers savevm_slirp_state = {
402 .save_state = net_slirp_state_save,
403 .load_state = net_slirp_state_load,
404};
405
406static int net_slirp_init(NetClientState *peer, const char *model,
407 const char *name, int restricted,
408 bool ipv4, const char *vnetwork, const char *vhost,
409 bool ipv6, const char *vprefix6, int vprefix6_len,
410 const char *vhost6,
411 const char *vhostname, const char *tftp_export,
412 const char *bootfile, const char *vdhcp_start,
413 const char *vnameserver, const char *vnameserver6,
414 const char *smb_export, const char *vsmbserver,
415 const char **dnssearch, const char *vdomainname,
416 const char *tftp_server_name,
417 Error **errp)
418{
419
420 struct in_addr net = { .s_addr = htonl(0x0a000200) };
421 struct in_addr mask = { .s_addr = htonl(0xffffff00) };
422 struct in_addr host = { .s_addr = htonl(0x0a000202) };
423 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) };
424 struct in_addr dns = { .s_addr = htonl(0x0a000203) };
425 struct in6_addr ip6_prefix;
426 struct in6_addr ip6_host;
427 struct in6_addr ip6_dns;
428#if defined(CONFIG_SMBD_COMMAND)
429 struct in_addr smbsrv = { .s_addr = 0 };
430#endif
431 SlirpConfig cfg = { 0 };
432 NetClientState *nc;
433 SlirpState *s;
434 char buf[20];
435 uint32_t addr;
436 int shift;
437 char *end;
438 struct slirp_config_str *config;
439
440 if (!ipv4 && (vnetwork || vhost || vnameserver)) {
441 error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
442 return -1;
443 }
444
445 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
446 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
447 return -1;
448 }
449
450 if (!ipv4 && !ipv6) {
451
452 error_setg(errp, "IPv4 and IPv6 disabled");
453 return -1;
454 }
455
456 if (vnetwork) {
457 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
458 if (!inet_aton(vnetwork, &net)) {
459 error_setg(errp, "Failed to parse netmask");
460 return -1;
461 }
462 addr = ntohl(net.s_addr);
463 if (!(addr & 0x80000000)) {
464 mask.s_addr = htonl(0xff000000);
465 } else if ((addr & 0xfff00000) == 0xac100000) {
466 mask.s_addr = htonl(0xfff00000);
467 } else if ((addr & 0xc0000000) == 0x80000000) {
468 mask.s_addr = htonl(0xffff0000);
469 } else if ((addr & 0xffff0000) == 0xc0a80000) {
470 mask.s_addr = htonl(0xffff0000);
471 } else if ((addr & 0xffff0000) == 0xc6120000) {
472 mask.s_addr = htonl(0xfffe0000);
473 } else if ((addr & 0xe0000000) == 0xe0000000) {
474 mask.s_addr = htonl(0xffffff00);
475 } else {
476 mask.s_addr = htonl(0xfffffff0);
477 }
478 } else {
479 if (!inet_aton(buf, &net)) {
480 error_setg(errp, "Failed to parse netmask");
481 return -1;
482 }
483 shift = strtol(vnetwork, &end, 10);
484 if (*end != '\0') {
485 if (!inet_aton(vnetwork, &mask)) {
486 error_setg(errp,
487 "Failed to parse netmask (trailing chars)");
488 return -1;
489 }
490 } else if (shift < 4 || shift > 32) {
491 error_setg(errp,
492 "Invalid netmask provided (must be in range 4-32)");
493 return -1;
494 } else {
495 mask.s_addr = htonl(0xffffffff << (32 - shift));
496 }
497 }
498 net.s_addr &= mask.s_addr;
499 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
500 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
501 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
502 }
503
504 if (vhost && !inet_aton(vhost, &host)) {
505 error_setg(errp, "Failed to parse host");
506 return -1;
507 }
508 if ((host.s_addr & mask.s_addr) != net.s_addr) {
509 error_setg(errp, "Host doesn't belong to network");
510 return -1;
511 }
512
513 if (vnameserver && !inet_aton(vnameserver, &dns)) {
514 error_setg(errp, "Failed to parse DNS");
515 return -1;
516 }
517 if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) {
518 error_setg(errp, "DNS doesn't belong to network");
519 return -1;
520 }
521 if (dns.s_addr == host.s_addr) {
522 error_setg(errp, "DNS must be different from host");
523 return -1;
524 }
525
526 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
527 error_setg(errp, "Failed to parse DHCP start address");
528 return -1;
529 }
530 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
531 error_setg(errp, "DHCP doesn't belong to network");
532 return -1;
533 }
534 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
535 error_setg(errp, "DHCP must be different from host and DNS");
536 return -1;
537 }
538
539#if defined(CONFIG_SMBD_COMMAND)
540 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
541 error_setg(errp, "Failed to parse SMB address");
542 return -1;
543 }
544#endif
545
546 if (!vprefix6) {
547 vprefix6 = "fec0::";
548 }
549 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
550 error_setg(errp, "Failed to parse IPv6 prefix");
551 return -1;
552 }
553
554 if (!vprefix6_len) {
555 vprefix6_len = 64;
556 }
557 if (vprefix6_len < 0 || vprefix6_len > 126) {
558 error_setg(errp,
559 "Invalid IPv6 prefix provided "
560 "(IPv6 prefix length must be between 0 and 126)");
561 return -1;
562 }
563
564 if (vhost6) {
565 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
566 error_setg(errp, "Failed to parse IPv6 host");
567 return -1;
568 }
569 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
570 error_setg(errp, "IPv6 Host doesn't belong to network");
571 return -1;
572 }
573 } else {
574 ip6_host = ip6_prefix;
575 ip6_host.s6_addr[15] |= 2;
576 }
577
578 if (vnameserver6) {
579 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
580 error_setg(errp, "Failed to parse IPv6 DNS");
581 return -1;
582 }
583 if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
584 error_setg(errp, "IPv6 DNS doesn't belong to network");
585 return -1;
586 }
587 } else {
588 ip6_dns = ip6_prefix;
589 ip6_dns.s6_addr[15] |= 3;
590 }
591
592 if (vdomainname && !*vdomainname) {
593 error_setg(errp, "'domainname' parameter cannot be empty");
594 return -1;
595 }
596
597 if (vdomainname && strlen(vdomainname) > 255) {
598 error_setg(errp, "'domainname' parameter cannot exceed 255 bytes");
599 return -1;
600 }
601
602 if (vhostname && strlen(vhostname) > 255) {
603 error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes");
604 return -1;
605 }
606
607 if (tftp_server_name && strlen(tftp_server_name) > 255) {
608 error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes");
609 return -1;
610 }
611
612 nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
613
614 qemu_set_info_str(nc, "net=%s,restrict=%s", inet_ntoa(net),
615 restricted ? "on" : "off");
616
617 s = DO_UPCAST(SlirpState, nc, nc);
618
619 cfg.version = SLIRP_CHECK_VERSION(4,7,0) ? 4 : 1;
620 cfg.restricted = restricted;
621 cfg.in_enabled = ipv4;
622 cfg.vnetwork = net;
623 cfg.vnetmask = mask;
624 cfg.vhost = host;
625 cfg.in6_enabled = ipv6;
626 cfg.vprefix_addr6 = ip6_prefix;
627 cfg.vprefix_len = vprefix6_len;
628 cfg.vhost6 = ip6_host;
629 cfg.vhostname = vhostname;
630 cfg.tftp_server_name = tftp_server_name;
631 cfg.tftp_path = tftp_export;
632 cfg.bootfile = bootfile;
633 cfg.vdhcp_start = dhcp;
634 cfg.vnameserver = dns;
635 cfg.vnameserver6 = ip6_dns;
636 cfg.vdnssearch = dnssearch;
637 cfg.vdomainname = vdomainname;
638 s->slirp = slirp_new(&cfg, &slirp_cb, s);
639 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
640
641
642
643
644
645
646
647
648
649 g_assert(slirp_state_version() == 4);
650 register_savevm_live("slirp", 0, slirp_state_version(),
651 &savevm_slirp_state, s->slirp);
652
653 s->poll_notifier.notify = net_slirp_poll_notify;
654 main_loop_poll_add_notifier(&s->poll_notifier);
655
656 for (config = slirp_configs; config; config = config->next) {
657 if (config->flags & SLIRP_CFG_HOSTFWD) {
658 if (slirp_hostfwd(s, config->str, errp) < 0) {
659 goto error;
660 }
661 } else {
662 if (slirp_guestfwd(s, config->str, errp) < 0) {
663 goto error;
664 }
665 }
666 }
667#if defined(CONFIG_SMBD_COMMAND)
668 if (smb_export) {
669 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
670 goto error;
671 }
672 }
673#endif
674
675 s->exit_notifier.notify = slirp_smb_exit;
676 qemu_add_exit_notifier(&s->exit_notifier);
677 return 0;
678
679error:
680 qemu_del_net_client(nc);
681 return -1;
682}
683
684static SlirpState *slirp_lookup(Monitor *mon, const char *id)
685{
686 if (id) {
687 NetClientState *nc = qemu_find_netdev(id);
688 if (!nc) {
689 monitor_printf(mon, "unrecognized netdev id '%s'\n", id);
690 return NULL;
691 }
692 if (strcmp(nc->model, "user")) {
693 monitor_printf(mon, "invalid device specified\n");
694 return NULL;
695 }
696 return DO_UPCAST(SlirpState, nc, nc);
697 } else {
698 if (QTAILQ_EMPTY(&slirp_stacks)) {
699 monitor_printf(mon, "user mode network stack not in use\n");
700 return NULL;
701 }
702 return QTAILQ_FIRST(&slirp_stacks);
703 }
704}
705
706void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
707{
708 struct in_addr host_addr = { .s_addr = INADDR_ANY };
709 int host_port;
710 char buf[256];
711 const char *src_str, *p;
712 SlirpState *s;
713 int is_udp = 0;
714 int err;
715 const char *arg1 = qdict_get_str(qdict, "arg1");
716 const char *arg2 = qdict_get_try_str(qdict, "arg2");
717
718 if (arg2) {
719 s = slirp_lookup(mon, arg1);
720 src_str = arg2;
721 } else {
722 s = slirp_lookup(mon, NULL);
723 src_str = arg1;
724 }
725 if (!s) {
726 return;
727 }
728
729 p = src_str;
730 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
731 goto fail_syntax;
732 }
733
734 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
735 is_udp = 0;
736 } else if (!strcmp(buf, "udp")) {
737 is_udp = 1;
738 } else {
739 goto fail_syntax;
740 }
741
742 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
743 goto fail_syntax;
744 }
745 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
746 goto fail_syntax;
747 }
748
749 if (qemu_strtoi(p, NULL, 10, &host_port)) {
750 goto fail_syntax;
751 }
752
753 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
754
755 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
756 err ? "not found" : "removed");
757 return;
758
759 fail_syntax:
760 monitor_printf(mon, "invalid format\n");
761}
762
763static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp)
764{
765 struct in_addr host_addr = { .s_addr = INADDR_ANY };
766 struct in_addr guest_addr = { .s_addr = 0 };
767 int host_port, guest_port;
768 const char *p;
769 char buf[256];
770 int is_udp;
771 char *end;
772 const char *fail_reason = "Unknown reason";
773
774 p = redir_str;
775 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
776 fail_reason = "No : separators";
777 goto fail_syntax;
778 }
779 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
780 is_udp = 0;
781 } else if (!strcmp(buf, "udp")) {
782 is_udp = 1;
783 } else {
784 fail_reason = "Bad protocol name";
785 goto fail_syntax;
786 }
787
788 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
789 fail_reason = "Missing : separator";
790 goto fail_syntax;
791 }
792 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
793 fail_reason = "Bad host address";
794 goto fail_syntax;
795 }
796
797 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
798 fail_reason = "Bad host port separator";
799 goto fail_syntax;
800 }
801 host_port = strtol(buf, &end, 0);
802 if (*end != '\0' || host_port < 0 || host_port > 65535) {
803 fail_reason = "Bad host port";
804 goto fail_syntax;
805 }
806
807 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
808 fail_reason = "Missing guest address";
809 goto fail_syntax;
810 }
811 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
812 fail_reason = "Bad guest address";
813 goto fail_syntax;
814 }
815
816 guest_port = strtol(p, &end, 0);
817 if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
818 fail_reason = "Bad guest port";
819 goto fail_syntax;
820 }
821
822 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
823 guest_port) < 0) {
824 error_setg(errp, "Could not set up host forwarding rule '%s'",
825 redir_str);
826 return -1;
827 }
828 return 0;
829
830 fail_syntax:
831 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
832 fail_reason);
833 return -1;
834}
835
836void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
837{
838 const char *redir_str;
839 SlirpState *s;
840 const char *arg1 = qdict_get_str(qdict, "arg1");
841 const char *arg2 = qdict_get_try_str(qdict, "arg2");
842
843 if (arg2) {
844 s = slirp_lookup(mon, arg1);
845 redir_str = arg2;
846 } else {
847 s = slirp_lookup(mon, NULL);
848 redir_str = arg1;
849 }
850 if (s) {
851 Error *err = NULL;
852 if (slirp_hostfwd(s, redir_str, &err) < 0) {
853 error_report_err(err);
854 }
855 }
856
857}
858
859#if defined(CONFIG_SMBD_COMMAND)
860
861
862static void slirp_smb_cleanup(SlirpState *s)
863{
864 int ret;
865
866 if (s->smb_dir) {
867 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
868 ret = system(cmd);
869 if (ret == -1 || !WIFEXITED(ret)) {
870 error_report("'%s' failed.", cmd);
871 } else if (WEXITSTATUS(ret)) {
872 error_report("'%s' failed. Error code: %d",
873 cmd, WEXITSTATUS(ret));
874 }
875 g_free(cmd);
876 g_free(s->smb_dir);
877 s->smb_dir = NULL;
878 }
879}
880
881static int slirp_smb(SlirpState* s, const char *exported_dir,
882 struct in_addr vserver_addr, Error **errp)
883{
884 char *smb_conf;
885 char *smb_cmdline;
886 struct passwd *passwd;
887 FILE *f;
888
889 passwd = getpwuid(geteuid());
890 if (!passwd) {
891 error_setg(errp, "Failed to retrieve user name");
892 return -1;
893 }
894
895 if (access(CONFIG_SMBD_COMMAND, F_OK)) {
896 error_setg(errp, "Could not find '%s', please install it",
897 CONFIG_SMBD_COMMAND);
898 return -1;
899 }
900
901 if (access(exported_dir, R_OK | X_OK)) {
902 error_setg(errp, "Error accessing shared directory '%s': %s",
903 exported_dir, strerror(errno));
904 return -1;
905 }
906
907 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
908 if (!s->smb_dir) {
909 error_setg(errp, "Could not create samba server dir");
910 return -1;
911 }
912 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
913
914 f = fopen(smb_conf, "w");
915 if (!f) {
916 slirp_smb_cleanup(s);
917 error_setg(errp,
918 "Could not create samba server configuration file '%s'",
919 smb_conf);
920 g_free(smb_conf);
921 return -1;
922 }
923 fprintf(f,
924 "[global]\n"
925 "private dir=%s\n"
926 "interfaces=127.0.0.1\n"
927 "bind interfaces only=yes\n"
928 "pid directory=%s\n"
929 "lock directory=%s\n"
930 "state directory=%s\n"
931 "cache directory=%s\n"
932 "ncalrpc dir=%s/ncalrpc\n"
933 "log file=%s/log.smbd\n"
934 "smb passwd file=%s/smbpasswd\n"
935 "security = user\n"
936 "map to guest = Bad User\n"
937 "load printers = no\n"
938 "printing = bsd\n"
939 "disable spoolss = yes\n"
940 "usershare max shares = 0\n"
941 "[qemu]\n"
942 "path=%s\n"
943 "read only=no\n"
944 "guest ok=yes\n"
945 "force user=%s\n",
946 s->smb_dir,
947 s->smb_dir,
948 s->smb_dir,
949 s->smb_dir,
950 s->smb_dir,
951 s->smb_dir,
952 s->smb_dir,
953 s->smb_dir,
954 exported_dir,
955 passwd->pw_name
956 );
957 fclose(f);
958
959 smb_cmdline = g_strdup_printf("%s -l %s -s %s",
960 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
961 g_free(smb_conf);
962
963 if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 ||
964 slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) {
965 slirp_smb_cleanup(s);
966 g_free(smb_cmdline);
967 error_setg(errp, "Conflicting/invalid smbserver address");
968 return -1;
969 }
970 g_free(smb_cmdline);
971 return 0;
972}
973
974#endif
975
976static int guestfwd_can_read(void *opaque)
977{
978 struct GuestFwd *fwd = opaque;
979 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
980}
981
982static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
983{
984 struct GuestFwd *fwd = opaque;
985 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
986}
987
988static ssize_t guestfwd_write(const void *buf, size_t len, void *chr)
989{
990 return qemu_chr_fe_write_all(chr, buf, len);
991}
992
993static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
994{
995
996 struct in_addr server = { .s_addr = 0 };
997 struct GuestFwd *fwd;
998 const char *p;
999 char buf[128];
1000 char *end;
1001 int port;
1002
1003 p = config_str;
1004 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
1005 goto fail_syntax;
1006 }
1007 if (strcmp(buf, "tcp") && buf[0] != '\0') {
1008 goto fail_syntax;
1009 }
1010 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
1011 goto fail_syntax;
1012 }
1013 if (buf[0] != '\0' && !inet_aton(buf, &server)) {
1014 goto fail_syntax;
1015 }
1016 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
1017 goto fail_syntax;
1018 }
1019 port = strtol(buf, &end, 10);
1020 if (*end != '\0' || port < 1 || port > 65535) {
1021 goto fail_syntax;
1022 }
1023
1024 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
1025
1026 if (g_str_has_prefix(p, "cmd:")) {
1027 if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) {
1028 error_setg(errp, "Conflicting/invalid host:port in guest "
1029 "forwarding rule '%s'", config_str);
1030 return -1;
1031 }
1032 } else {
1033 Error *err = NULL;
1034
1035
1036
1037
1038 Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL);
1039
1040 if (!chr) {
1041 error_setg(errp, "Could not open guest forwarding device '%s'",
1042 buf);
1043 return -1;
1044 }
1045
1046 fwd = g_new(struct GuestFwd, 1);
1047 qemu_chr_fe_init(&fwd->hd, chr, &err);
1048 if (err) {
1049 error_propagate(errp, err);
1050 object_unparent(OBJECT(chr));
1051 g_free(fwd);
1052 return -1;
1053 }
1054
1055 if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd,
1056 &server, port) < 0) {
1057 error_setg(errp, "Conflicting/invalid host:port in guest "
1058 "forwarding rule '%s'", config_str);
1059 qemu_chr_fe_deinit(&fwd->hd, true);
1060 g_free(fwd);
1061 return -1;
1062 }
1063 fwd->server = server;
1064 fwd->port = port;
1065 fwd->slirp = s->slirp;
1066
1067 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
1068 NULL, NULL, fwd, NULL, true);
1069 s->fwd = g_slist_append(s->fwd, fwd);
1070 }
1071 return 0;
1072
1073 fail_syntax:
1074 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
1075 return -1;
1076}
1077
1078void hmp_info_usernet(Monitor *mon, const QDict *qdict)
1079{
1080 SlirpState *s;
1081
1082 QTAILQ_FOREACH(s, &slirp_stacks, entry) {
1083 int id;
1084 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
1085 char *info = slirp_connection_info(s->slirp);
1086 monitor_printf(mon, "Hub %d (%s):\n%s",
1087 got_hub_id ? id : -1,
1088 s->nc.name, info);
1089 g_free(info);
1090 }
1091}
1092
1093static void
1094net_init_slirp_configs(const StringList *fwd, int flags)
1095{
1096 while (fwd) {
1097 struct slirp_config_str *config;
1098
1099 config = g_malloc0(sizeof(*config));
1100 pstrcpy(config->str, sizeof(config->str), fwd->value->str);
1101 config->flags = flags;
1102 config->next = slirp_configs;
1103 slirp_configs = config;
1104
1105 fwd = fwd->next;
1106 }
1107}
1108
1109static const char **slirp_dnssearch(const StringList *dnsname)
1110{
1111 const StringList *c = dnsname;
1112 size_t i = 0, num_opts = 0;
1113 const char **ret;
1114
1115 while (c) {
1116 num_opts++;
1117 c = c->next;
1118 }
1119
1120 if (num_opts == 0) {
1121 return NULL;
1122 }
1123
1124 ret = g_malloc((num_opts + 1) * sizeof(*ret));
1125 c = dnsname;
1126 while (c) {
1127 ret[i++] = c->value->str;
1128 c = c->next;
1129 }
1130 ret[i] = NULL;
1131 return ret;
1132}
1133
1134int net_init_slirp(const Netdev *netdev, const char *name,
1135 NetClientState *peer, Error **errp)
1136{
1137 struct slirp_config_str *config;
1138 char *vnet;
1139 int ret;
1140 const NetdevUserOptions *user;
1141 const char **dnssearch;
1142 bool ipv4 = true, ipv6 = true;
1143
1144 assert(netdev->type == NET_CLIENT_DRIVER_USER);
1145 user = &netdev->u.user;
1146
1147 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
1148 (user->has_ipv4 && !user->ipv4)) {
1149 ipv4 = 0;
1150 }
1151 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
1152 (user->has_ipv6 && !user->ipv6)) {
1153 ipv6 = 0;
1154 }
1155
1156 vnet = user->has_net ? g_strdup(user->net) :
1157 user->has_ip ? g_strdup_printf("%s/24", user->ip) :
1158 NULL;
1159
1160 dnssearch = slirp_dnssearch(user->dnssearch);
1161
1162
1163
1164 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
1165 net_init_slirp_configs(user->guestfwd, 0);
1166
1167 ret = net_slirp_init(peer, "user", name, user->q_restrict,
1168 ipv4, vnet, user->host,
1169 ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
1170 user->ipv6_host, user->hostname, user->tftp,
1171 user->bootfile, user->dhcpstart,
1172 user->dns, user->ipv6_dns, user->smb,
1173 user->smbserver, dnssearch, user->domainname,
1174 user->tftp_server_name, errp);
1175
1176 while (slirp_configs) {
1177 config = slirp_configs;
1178 slirp_configs = config->next;
1179 g_free(config);
1180 }
1181
1182 g_free(vnet);
1183 g_free(dnssearch);
1184
1185 return ret;
1186}
1187
