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24#include "qemu/osdep.h"
25#include "qemu-common.h"
26#include "qemu/timer.h"
27#include "qemu/error-report.h"
28#include "chardev/char-fe.h"
29#include "migration/register.h"
30#include "slirp.h"
31#include "hw/hw.h"
32#include "qemu/cutils.h"
33
34#ifndef _WIN32
35#include <net/if.h>
36#endif
37
38
39struct in_addr loopback_addr;
40
41unsigned long loopback_mask;
42
43
44static const uint8_t special_ethaddr[ETH_ALEN] = {
45 0x52, 0x55, 0x00, 0x00, 0x00, 0x00
46};
47
48u_int curtime;
49
50static QTAILQ_HEAD(slirp_instances, Slirp) slirp_instances =
51 QTAILQ_HEAD_INITIALIZER(slirp_instances);
52
53static struct in_addr dns_addr;
54#ifndef _WIN32
55static struct in6_addr dns6_addr;
56#endif
57static u_int dns_addr_time;
58#ifndef _WIN32
59static u_int dns6_addr_time;
60#endif
61
62#define TIMEOUT_FAST 2
63#define TIMEOUT_SLOW 499
64
65#define TIMEOUT_DEFAULT 1000
66
67#ifdef _WIN32
68
69int get_dns_addr(struct in_addr *pdns_addr)
70{
71 FIXED_INFO *FixedInfo=NULL;
72 ULONG BufLen;
73 DWORD ret;
74 IP_ADDR_STRING *pIPAddr;
75 struct in_addr tmp_addr;
76
77 if (dns_addr.s_addr != 0 && (curtime - dns_addr_time) < TIMEOUT_DEFAULT) {
78 *pdns_addr = dns_addr;
79 return 0;
80 }
81
82 FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
83 BufLen = sizeof(FIXED_INFO);
84
85 if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
86 if (FixedInfo) {
87 GlobalFree(FixedInfo);
88 FixedInfo = NULL;
89 }
90 FixedInfo = GlobalAlloc(GPTR, BufLen);
91 }
92
93 if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
94 printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret );
95 if (FixedInfo) {
96 GlobalFree(FixedInfo);
97 FixedInfo = NULL;
98 }
99 return -1;
100 }
101
102 pIPAddr = &(FixedInfo->DnsServerList);
103 inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
104 *pdns_addr = tmp_addr;
105 dns_addr = tmp_addr;
106 dns_addr_time = curtime;
107 if (FixedInfo) {
108 GlobalFree(FixedInfo);
109 FixedInfo = NULL;
110 }
111 return 0;
112}
113
114int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id)
115{
116 return -1;
117}
118
119static void winsock_cleanup(void)
120{
121 WSACleanup();
122}
123
124#else
125
126static int get_dns_addr_cached(void *pdns_addr, void *cached_addr,
127 socklen_t addrlen,
128 struct stat *cached_stat, u_int *cached_time)
129{
130 struct stat old_stat;
131 if (curtime - *cached_time < TIMEOUT_DEFAULT) {
132 memcpy(pdns_addr, cached_addr, addrlen);
133 return 0;
134 }
135 old_stat = *cached_stat;
136 if (stat("/etc/resolv.conf", cached_stat) != 0) {
137 return -1;
138 }
139 if (cached_stat->st_dev == old_stat.st_dev
140 && cached_stat->st_ino == old_stat.st_ino
141 && cached_stat->st_size == old_stat.st_size
142 && cached_stat->st_mtime == old_stat.st_mtime) {
143 memcpy(pdns_addr, cached_addr, addrlen);
144 return 0;
145 }
146 return 1;
147}
148
149static int get_dns_addr_resolv_conf(int af, void *pdns_addr, void *cached_addr,
150 socklen_t addrlen, uint32_t *scope_id,
151 u_int *cached_time)
152{
153 char buff[512];
154 char buff2[257];
155 FILE *f;
156 int found = 0;
157 void *tmp_addr = alloca(addrlen);
158 unsigned if_index;
159
160 f = fopen("/etc/resolv.conf", "r");
161 if (!f)
162 return -1;
163
164#ifdef DEBUG
165 fprintf(stderr, "IP address of your DNS(s): ");
166#endif
167 while (fgets(buff, 512, f) != NULL) {
168 if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
169 char *c = strchr(buff2, '%');
170 if (c) {
171 if_index = if_nametoindex(c + 1);
172 *c = '\0';
173 } else {
174 if_index = 0;
175 }
176
177 if (!inet_pton(af, buff2, tmp_addr)) {
178 continue;
179 }
180
181 if (!found) {
182 memcpy(pdns_addr, tmp_addr, addrlen);
183 memcpy(cached_addr, tmp_addr, addrlen);
184 if (scope_id) {
185 *scope_id = if_index;
186 }
187 *cached_time = curtime;
188 }
189#ifdef DEBUG
190 else
191 fprintf(stderr, ", ");
192#endif
193 if (++found > 3) {
194#ifdef DEBUG
195 fprintf(stderr, "(more)");
196#endif
197 break;
198 }
199#ifdef DEBUG
200 else {
201 char s[INET6_ADDRSTRLEN];
202 const char *res = inet_ntop(af, tmp_addr, s, sizeof(s));
203 if (!res) {
204 res = "(string conversion error)";
205 }
206 fprintf(stderr, "%s", res);
207 }
208#endif
209 }
210 }
211 fclose(f);
212 if (!found)
213 return -1;
214 return 0;
215}
216
217int get_dns_addr(struct in_addr *pdns_addr)
218{
219 static struct stat dns_addr_stat;
220
221 if (dns_addr.s_addr != 0) {
222 int ret;
223 ret = get_dns_addr_cached(pdns_addr, &dns_addr, sizeof(dns_addr),
224 &dns_addr_stat, &dns_addr_time);
225 if (ret <= 0) {
226 return ret;
227 }
228 }
229 return get_dns_addr_resolv_conf(AF_INET, pdns_addr, &dns_addr,
230 sizeof(dns_addr), NULL, &dns_addr_time);
231}
232
233int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id)
234{
235 static struct stat dns6_addr_stat;
236
237 if (!in6_zero(&dns6_addr)) {
238 int ret;
239 ret = get_dns_addr_cached(pdns6_addr, &dns6_addr, sizeof(dns6_addr),
240 &dns6_addr_stat, &dns6_addr_time);
241 if (ret <= 0) {
242 return ret;
243 }
244 }
245 return get_dns_addr_resolv_conf(AF_INET6, pdns6_addr, &dns6_addr,
246 sizeof(dns6_addr),
247 scope_id, &dns6_addr_time);
248}
249
250#endif
251
252static void slirp_init_once(void)
253{
254 static int initialized;
255#ifdef _WIN32
256 WSADATA Data;
257#endif
258
259 if (initialized) {
260 return;
261 }
262 initialized = 1;
263
264#ifdef _WIN32
265 WSAStartup(MAKEWORD(2,0), &Data);
266 atexit(winsock_cleanup);
267#endif
268
269 loopback_addr.s_addr = htonl(INADDR_LOOPBACK);
270 loopback_mask = htonl(IN_CLASSA_NET);
271}
272
273static void slirp_state_save(QEMUFile *f, void *opaque);
274static int slirp_state_load(QEMUFile *f, void *opaque, int version_id);
275
276static SaveVMHandlers savevm_slirp_state = {
277 .save_state = slirp_state_save,
278 .load_state = slirp_state_load,
279};
280
281Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
282 struct in_addr vnetmask, struct in_addr vhost,
283 bool in6_enabled,
284 struct in6_addr vprefix_addr6, uint8_t vprefix_len,
285 struct in6_addr vhost6, const char *vhostname,
286 const char *tftp_server_name,
287 const char *tftp_path, const char *bootfile,
288 struct in_addr vdhcp_start, struct in_addr vnameserver,
289 struct in6_addr vnameserver6, const char **vdnssearch,
290 const char *vdomainname, void *opaque)
291{
292 Slirp *slirp = g_malloc0(sizeof(Slirp));
293
294 slirp_init_once();
295
296 slirp->grand = g_rand_new();
297 slirp->restricted = restricted;
298
299 slirp->in_enabled = in_enabled;
300 slirp->in6_enabled = in6_enabled;
301
302 if_init(slirp);
303 ip_init(slirp);
304 ip6_init(slirp);
305
306
307 m_init(slirp);
308
309 slirp->vnetwork_addr = vnetwork;
310 slirp->vnetwork_mask = vnetmask;
311 slirp->vhost_addr = vhost;
312 slirp->vprefix_addr6 = vprefix_addr6;
313 slirp->vprefix_len = vprefix_len;
314 slirp->vhost_addr6 = vhost6;
315 if (vhostname) {
316 pstrcpy(slirp->client_hostname, sizeof(slirp->client_hostname),
317 vhostname);
318 }
319 slirp->tftp_prefix = g_strdup(tftp_path);
320 slirp->bootp_filename = g_strdup(bootfile);
321 slirp->vdomainname = g_strdup(vdomainname);
322 slirp->vdhcp_startaddr = vdhcp_start;
323 slirp->vnameserver_addr = vnameserver;
324 slirp->vnameserver_addr6 = vnameserver6;
325 slirp->tftp_server_name = g_strdup(tftp_server_name);
326
327 if (vdnssearch) {
328 translate_dnssearch(slirp, vdnssearch);
329 }
330
331 slirp->opaque = opaque;
332
333 register_savevm_live(NULL, "slirp", 0, 4, &savevm_slirp_state, slirp);
334
335 QTAILQ_INSERT_TAIL(&slirp_instances, slirp, entry);
336
337 return slirp;
338}
339
340void slirp_cleanup(Slirp *slirp)
341{
342 QTAILQ_REMOVE(&slirp_instances, slirp, entry);
343
344 unregister_savevm(NULL, "slirp", slirp);
345
346 ip_cleanup(slirp);
347 ip6_cleanup(slirp);
348 m_cleanup(slirp);
349
350 g_rand_free(slirp->grand);
351
352 g_free(slirp->vdnssearch);
353 g_free(slirp->tftp_prefix);
354 g_free(slirp->bootp_filename);
355 g_free(slirp->vdomainname);
356 g_free(slirp);
357}
358
359#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
360#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
361
362static void slirp_update_timeout(uint32_t *timeout)
363{
364 Slirp *slirp;
365 uint32_t t;
366
367 if (*timeout <= TIMEOUT_FAST) {
368 return;
369 }
370
371 t = MIN(1000, *timeout);
372
373
374
375
376 QTAILQ_FOREACH(slirp, &slirp_instances, entry) {
377 if (slirp->time_fasttimo) {
378 *timeout = TIMEOUT_FAST;
379 return;
380 }
381 if (slirp->do_slowtimo) {
382 t = MIN(TIMEOUT_SLOW, t);
383 }
384 }
385 *timeout = t;
386}
387
388void slirp_pollfds_fill(GArray *pollfds, uint32_t *timeout)
389{
390 Slirp *slirp;
391 struct socket *so, *so_next;
392
393 if (QTAILQ_EMPTY(&slirp_instances)) {
394 return;
395 }
396
397
398
399
400
401 QTAILQ_FOREACH(slirp, &slirp_instances, entry) {
402
403
404
405
406 slirp->do_slowtimo = ((slirp->tcb.so_next != &slirp->tcb) ||
407 (&slirp->ipq.ip_link != slirp->ipq.ip_link.next));
408
409 for (so = slirp->tcb.so_next; so != &slirp->tcb;
410 so = so_next) {
411 int events = 0;
412
413 so_next = so->so_next;
414
415 so->pollfds_idx = -1;
416
417
418
419
420 if (slirp->time_fasttimo == 0 &&
421 so->so_tcpcb->t_flags & TF_DELACK) {
422 slirp->time_fasttimo = curtime;
423 }
424
425
426
427
428
429 if (so->so_state & SS_NOFDREF || so->s == -1) {
430 continue;
431 }
432
433
434
435
436 if (so->so_state & SS_FACCEPTCONN) {
437 GPollFD pfd = {
438 .fd = so->s,
439 .events = G_IO_IN | G_IO_HUP | G_IO_ERR,
440 };
441 so->pollfds_idx = pollfds->len;
442 g_array_append_val(pollfds, pfd);
443 continue;
444 }
445
446
447
448
449 if (so->so_state & SS_ISFCONNECTING) {
450 GPollFD pfd = {
451 .fd = so->s,
452 .events = G_IO_OUT | G_IO_ERR,
453 };
454 so->pollfds_idx = pollfds->len;
455 g_array_append_val(pollfds, pfd);
456 continue;
457 }
458
459
460
461
462
463 if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
464 events |= G_IO_OUT | G_IO_ERR;
465 }
466
467
468
469
470
471 if (CONN_CANFRCV(so) &&
472 (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
473 events |= G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_PRI;
474 }
475
476 if (events) {
477 GPollFD pfd = {
478 .fd = so->s,
479 .events = events,
480 };
481 so->pollfds_idx = pollfds->len;
482 g_array_append_val(pollfds, pfd);
483 }
484 }
485
486
487
488
489 for (so = slirp->udb.so_next; so != &slirp->udb;
490 so = so_next) {
491 so_next = so->so_next;
492
493 so->pollfds_idx = -1;
494
495
496
497
498 if (so->so_expire) {
499 if (so->so_expire <= curtime) {
500 udp_detach(so);
501 continue;
502 } else {
503 slirp->do_slowtimo = true;
504 }
505 }
506
507
508
509
510
511
512
513
514
515
516
517 if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
518 GPollFD pfd = {
519 .fd = so->s,
520 .events = G_IO_IN | G_IO_HUP | G_IO_ERR,
521 };
522 so->pollfds_idx = pollfds->len;
523 g_array_append_val(pollfds, pfd);
524 }
525 }
526
527
528
529
530 for (so = slirp->icmp.so_next; so != &slirp->icmp;
531 so = so_next) {
532 so_next = so->so_next;
533
534 so->pollfds_idx = -1;
535
536
537
538
539 if (so->so_expire) {
540 if (so->so_expire <= curtime) {
541 icmp_detach(so);
542 continue;
543 } else {
544 slirp->do_slowtimo = true;
545 }
546 }
547
548 if (so->so_state & SS_ISFCONNECTED) {
549 GPollFD pfd = {
550 .fd = so->s,
551 .events = G_IO_IN | G_IO_HUP | G_IO_ERR,
552 };
553 so->pollfds_idx = pollfds->len;
554 g_array_append_val(pollfds, pfd);
555 }
556 }
557 }
558 slirp_update_timeout(timeout);
559}
560
561void slirp_pollfds_poll(GArray *pollfds, int select_error)
562{
563 Slirp *slirp;
564 struct socket *so, *so_next;
565 int ret;
566
567 if (QTAILQ_EMPTY(&slirp_instances)) {
568 return;
569 }
570
571 curtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
572
573 QTAILQ_FOREACH(slirp, &slirp_instances, entry) {
574
575
576
577 if (slirp->time_fasttimo &&
578 ((curtime - slirp->time_fasttimo) >= TIMEOUT_FAST)) {
579 tcp_fasttimo(slirp);
580 slirp->time_fasttimo = 0;
581 }
582 if (slirp->do_slowtimo &&
583 ((curtime - slirp->last_slowtimo) >= TIMEOUT_SLOW)) {
584 ip_slowtimo(slirp);
585 tcp_slowtimo(slirp);
586 slirp->last_slowtimo = curtime;
587 }
588
589
590
591
592 if (!select_error) {
593
594
595
596 for (so = slirp->tcb.so_next; so != &slirp->tcb;
597 so = so_next) {
598 int revents;
599
600 so_next = so->so_next;
601
602 revents = 0;
603 if (so->pollfds_idx != -1) {
604 revents = g_array_index(pollfds, GPollFD,
605 so->pollfds_idx).revents;
606 }
607
608 if (so->so_state & SS_NOFDREF || so->s == -1) {
609 continue;
610 }
611
612
613
614
615
616
617 if (revents & G_IO_PRI) {
618 ret = sorecvoob(so);
619 if (ret < 0) {
620
621
622 continue;
623 }
624 }
625
626
627
628 else if (revents & (G_IO_IN | G_IO_HUP | G_IO_ERR)) {
629
630
631
632 if (so->so_state & SS_FACCEPTCONN) {
633 tcp_connect(so);
634 continue;
635 }
636 ret = soread(so);
637
638
639 if (ret > 0) {
640 tcp_output(sototcpcb(so));
641 }
642 if (ret < 0) {
643
644
645 continue;
646 }
647 }
648
649
650
651
652 if (!(so->so_state & SS_NOFDREF) &&
653 (revents & (G_IO_OUT | G_IO_ERR))) {
654
655
656
657 if (so->so_state & SS_ISFCONNECTING) {
658
659 so->so_state &= ~SS_ISFCONNECTING;
660
661 ret = send(so->s, (const void *) &ret, 0, 0);
662 if (ret < 0) {
663
664 if (errno == EAGAIN || errno == EWOULDBLOCK ||
665 errno == EINPROGRESS || errno == ENOTCONN) {
666 continue;
667 }
668
669
670 so->so_state &= SS_PERSISTENT_MASK;
671 so->so_state |= SS_NOFDREF;
672 }
673
674
675
676
677
678 tcp_input((struct mbuf *)NULL, sizeof(struct ip), so,
679 so->so_ffamily);
680
681 } else {
682 ret = sowrite(so);
683 if (ret > 0) {
684
685
686
687 tcp_output(sototcpcb(so));
688 }
689 }
690 }
691
692
693
694
695
696#ifdef PROBE_CONN
697 if (so->so_state & SS_ISFCONNECTING) {
698 ret = qemu_recv(so->s, &ret, 0, 0);
699
700 if (ret < 0) {
701
702 if (errno == EAGAIN || errno == EWOULDBLOCK ||
703 errno == EINPROGRESS || errno == ENOTCONN) {
704 continue;
705 }
706
707
708 so->so_state &= SS_PERSISTENT_MASK;
709 so->so_state |= SS_NOFDREF;
710
711
712 } else {
713 ret = send(so->s, &ret, 0, 0);
714 if (ret < 0) {
715
716 if (errno == EAGAIN || errno == EWOULDBLOCK ||
717 errno == EINPROGRESS || errno == ENOTCONN) {
718 continue;
719 }
720
721 so->so_state &= SS_PERSISTENT_MASK;
722 so->so_state |= SS_NOFDREF;
723 } else {
724 so->so_state &= ~SS_ISFCONNECTING;
725 }
726
727 }
728 tcp_input((struct mbuf *)NULL, sizeof(struct ip), so,
729 so->so_ffamily);
730 }
731#endif
732 }
733
734
735
736
737
738
739 for (so = slirp->udb.so_next; so != &slirp->udb;
740 so = so_next) {
741 int revents;
742
743 so_next = so->so_next;
744
745 revents = 0;
746 if (so->pollfds_idx != -1) {
747 revents = g_array_index(pollfds, GPollFD,
748 so->pollfds_idx).revents;
749 }
750
751 if (so->s != -1 &&
752 (revents & (G_IO_IN | G_IO_HUP | G_IO_ERR))) {
753 sorecvfrom(so);
754 }
755 }
756
757
758
759
760 for (so = slirp->icmp.so_next; so != &slirp->icmp;
761 so = so_next) {
762 int revents;
763
764 so_next = so->so_next;
765
766 revents = 0;
767 if (so->pollfds_idx != -1) {
768 revents = g_array_index(pollfds, GPollFD,
769 so->pollfds_idx).revents;
770 }
771
772 if (so->s != -1 &&
773 (revents & (G_IO_IN | G_IO_HUP | G_IO_ERR))) {
774 icmp_receive(so);
775 }
776 }
777 }
778
779 if_start(slirp);
780 }
781}
782
783static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
784{
785 struct slirp_arphdr *ah = (struct slirp_arphdr *)(pkt + ETH_HLEN);
786 uint8_t arp_reply[MAX(ETH_HLEN + sizeof(struct slirp_arphdr), 64)];
787 struct ethhdr *reh = (struct ethhdr *)arp_reply;
788 struct slirp_arphdr *rah = (struct slirp_arphdr *)(arp_reply + ETH_HLEN);
789 int ar_op;
790 struct ex_list *ex_ptr;
791
792 if (!slirp->in_enabled) {
793 return;
794 }
795
796 ar_op = ntohs(ah->ar_op);
797 switch(ar_op) {
798 case ARPOP_REQUEST:
799 if (ah->ar_tip == ah->ar_sip) {
800
801 arp_table_add(slirp, ah->ar_sip, ah->ar_sha);
802 return;
803 }
804
805 if ((ah->ar_tip & slirp->vnetwork_mask.s_addr) ==
806 slirp->vnetwork_addr.s_addr) {
807 if (ah->ar_tip == slirp->vnameserver_addr.s_addr ||
808 ah->ar_tip == slirp->vhost_addr.s_addr)
809 goto arp_ok;
810 for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
811 if (ex_ptr->ex_addr.s_addr == ah->ar_tip)
812 goto arp_ok;
813 }
814 return;
815 arp_ok:
816 memset(arp_reply, 0, sizeof(arp_reply));
817
818 arp_table_add(slirp, ah->ar_sip, ah->ar_sha);
819
820
821 memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
822 memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
823 memcpy(&reh->h_source[2], &ah->ar_tip, 4);
824 reh->h_proto = htons(ETH_P_ARP);
825
826 rah->ar_hrd = htons(1);
827 rah->ar_pro = htons(ETH_P_IP);
828 rah->ar_hln = ETH_ALEN;
829 rah->ar_pln = 4;
830 rah->ar_op = htons(ARPOP_REPLY);
831 memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
832 rah->ar_sip = ah->ar_tip;
833 memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
834 rah->ar_tip = ah->ar_sip;
835 slirp_output(slirp->opaque, arp_reply, sizeof(arp_reply));
836 }
837 break;
838 case ARPOP_REPLY:
839 arp_table_add(slirp, ah->ar_sip, ah->ar_sha);
840 break;
841 default:
842 break;
843 }
844}
845
846void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
847{
848 struct mbuf *m;
849 int proto;
850
851 if (pkt_len < ETH_HLEN)
852 return;
853
854 proto = ntohs(*(uint16_t *)(pkt + 12));
855 switch(proto) {
856 case ETH_P_ARP:
857 arp_input(slirp, pkt, pkt_len);
858 break;
859 case ETH_P_IP:
860 case ETH_P_IPV6:
861 m = m_get(slirp);
862 if (!m)
863 return;
864
865
866 if (M_FREEROOM(m) < pkt_len + TCPIPHDR_DELTA + 2) {
867 m_inc(m, pkt_len + TCPIPHDR_DELTA + 2);
868 }
869 m->m_len = pkt_len + TCPIPHDR_DELTA + 2;
870 memcpy(m->m_data + TCPIPHDR_DELTA + 2, pkt, pkt_len);
871
872 m->m_data += TCPIPHDR_DELTA + 2 + ETH_HLEN;
873 m->m_len -= TCPIPHDR_DELTA + 2 + ETH_HLEN;
874
875 if (proto == ETH_P_IP) {
876 ip_input(m);
877 } else if (proto == ETH_P_IPV6) {
878 ip6_input(m);
879 }
880 break;
881
882 case ETH_P_NCSI:
883 ncsi_input(slirp, pkt, pkt_len);
884 break;
885
886 default:
887 break;
888 }
889}
890
891
892
893
894
895static int if_encap4(Slirp *slirp, struct mbuf *ifm, struct ethhdr *eh,
896 uint8_t ethaddr[ETH_ALEN])
897{
898 const struct ip *iph = (const struct ip *)ifm->m_data;
899
900 if (iph->ip_dst.s_addr == 0) {
901
902
903 return 1;
904 }
905 if (!arp_table_search(slirp, iph->ip_dst.s_addr, ethaddr)) {
906 uint8_t arp_req[ETH_HLEN + sizeof(struct slirp_arphdr)];
907 struct ethhdr *reh = (struct ethhdr *)arp_req;
908 struct slirp_arphdr *rah = (struct slirp_arphdr *)(arp_req + ETH_HLEN);
909
910 if (!ifm->resolution_requested) {
911
912 memset(reh->h_dest, 0xff, ETH_ALEN);
913 memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
914 memcpy(&reh->h_source[2], &slirp->vhost_addr, 4);
915 reh->h_proto = htons(ETH_P_ARP);
916 rah->ar_hrd = htons(1);
917 rah->ar_pro = htons(ETH_P_IP);
918 rah->ar_hln = ETH_ALEN;
919 rah->ar_pln = 4;
920 rah->ar_op = htons(ARPOP_REQUEST);
921
922
923 memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 4);
924 memcpy(&rah->ar_sha[2], &slirp->vhost_addr, 4);
925
926
927 rah->ar_sip = slirp->vhost_addr.s_addr;
928
929
930 memset(rah->ar_tha, 0, ETH_ALEN);
931
932
933 rah->ar_tip = iph->ip_dst.s_addr;
934 slirp->client_ipaddr = iph->ip_dst;
935 slirp_output(slirp->opaque, arp_req, sizeof(arp_req));
936 ifm->resolution_requested = true;
937
938
939 ifm->expiration_date = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + 1000000000ULL;
940 }
941 return 0;
942 } else {
943 memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 4);
944
945 memcpy(&eh->h_source[2], &slirp->vhost_addr, 4);
946 eh->h_proto = htons(ETH_P_IP);
947
948
949 return 2;
950 }
951}
952
953
954
955
956
957static int if_encap6(Slirp *slirp, struct mbuf *ifm, struct ethhdr *eh,
958 uint8_t ethaddr[ETH_ALEN])
959{
960 const struct ip6 *ip6h = mtod(ifm, const struct ip6 *);
961 if (!ndp_table_search(slirp, ip6h->ip_dst, ethaddr)) {
962 if (!ifm->resolution_requested) {
963 ndp_send_ns(slirp, ip6h->ip_dst);
964 ifm->resolution_requested = true;
965 ifm->expiration_date =
966 qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + 1000000000ULL;
967 }
968 return 0;
969 } else {
970 eh->h_proto = htons(ETH_P_IPV6);
971 in6_compute_ethaddr(ip6h->ip_src, eh->h_source);
972
973
974 return 2;
975 }
976}
977
978
979
980
981int if_encap(Slirp *slirp, struct mbuf *ifm)
982{
983 uint8_t buf[1600];
984 struct ethhdr *eh = (struct ethhdr *)buf;
985 uint8_t ethaddr[ETH_ALEN];
986 const struct ip *iph = (const struct ip *)ifm->m_data;
987 int ret;
988
989 if (ifm->m_len + ETH_HLEN > sizeof(buf)) {
990 return 1;
991 }
992
993 switch (iph->ip_v) {
994 case IPVERSION:
995 ret = if_encap4(slirp, ifm, eh, ethaddr);
996 if (ret < 2) {
997 return ret;
998 }
999 break;
1000
1001 case IP6VERSION:
1002 ret = if_encap6(slirp, ifm, eh, ethaddr);
1003 if (ret < 2) {
1004 return ret;
1005 }
1006 break;
1007
1008 default:
1009 g_assert_not_reached();
1010 break;
1011 }
1012
1013 memcpy(eh->h_dest, ethaddr, ETH_ALEN);
1014 DEBUG_ARGS((dfd, " src = %02x:%02x:%02x:%02x:%02x:%02x\n",
1015 eh->h_source[0], eh->h_source[1], eh->h_source[2],
1016 eh->h_source[3], eh->h_source[4], eh->h_source[5]));
1017 DEBUG_ARGS((dfd, " dst = %02x:%02x:%02x:%02x:%02x:%02x\n",
1018 eh->h_dest[0], eh->h_dest[1], eh->h_dest[2],
1019 eh->h_dest[3], eh->h_dest[4], eh->h_dest[5]));
1020 memcpy(buf + sizeof(struct ethhdr), ifm->m_data, ifm->m_len);
1021 slirp_output(slirp->opaque, buf, ifm->m_len + ETH_HLEN);
1022 return 1;
1023}
1024
1025
1026int slirp_remove_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr,
1027 int host_port)
1028{
1029 struct socket *so;
1030 struct socket *head = (is_udp ? &slirp->udb : &slirp->tcb);
1031 struct sockaddr_in addr;
1032 int port = htons(host_port);
1033 socklen_t addr_len;
1034
1035 for (so = head->so_next; so != head; so = so->so_next) {
1036 addr_len = sizeof(addr);
1037 if ((so->so_state & SS_HOSTFWD) &&
1038 getsockname(so->s, (struct sockaddr *)&addr, &addr_len) == 0 &&
1039 addr.sin_addr.s_addr == host_addr.s_addr &&
1040 addr.sin_port == port) {
1041 close(so->s);
1042 sofree(so);
1043 return 0;
1044 }
1045 }
1046
1047 return -1;
1048}
1049
1050int slirp_add_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr,
1051 int host_port, struct in_addr guest_addr, int guest_port)
1052{
1053 if (!guest_addr.s_addr) {
1054 guest_addr = slirp->vdhcp_startaddr;
1055 }
1056 if (is_udp) {
1057 if (!udp_listen(slirp, host_addr.s_addr, htons(host_port),
1058 guest_addr.s_addr, htons(guest_port), SS_HOSTFWD))
1059 return -1;
1060 } else {
1061 if (!tcp_listen(slirp, host_addr.s_addr, htons(host_port),
1062 guest_addr.s_addr, htons(guest_port), SS_HOSTFWD))
1063 return -1;
1064 }
1065 return 0;
1066}
1067
1068int slirp_add_exec(Slirp *slirp, int do_pty, const void *args,
1069 struct in_addr *guest_addr, int guest_port)
1070{
1071 if (!guest_addr->s_addr) {
1072 guest_addr->s_addr = slirp->vnetwork_addr.s_addr |
1073 (htonl(0x0204) & ~slirp->vnetwork_mask.s_addr);
1074 }
1075 if ((guest_addr->s_addr & slirp->vnetwork_mask.s_addr) !=
1076 slirp->vnetwork_addr.s_addr ||
1077 guest_addr->s_addr == slirp->vhost_addr.s_addr ||
1078 guest_addr->s_addr == slirp->vnameserver_addr.s_addr) {
1079 return -1;
1080 }
1081 return add_exec(&slirp->exec_list, do_pty, (char *)args, *guest_addr,
1082 htons(guest_port));
1083}
1084
1085ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags)
1086{
1087 if (so->s == -1 && so->extra) {
1088
1089
1090 qemu_chr_fe_write_all(so->extra, buf, len);
1091 return len;
1092 }
1093
1094 if (so->s == -1) {
1095
1096
1097
1098
1099
1100
1101 errno = EBADF;
1102 return -1;
1103 }
1104
1105 return send(so->s, buf, len, flags);
1106}
1107
1108static struct socket *
1109slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port)
1110{
1111 struct socket *so;
1112
1113 for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
1114 if (so->so_faddr.s_addr == guest_addr.s_addr &&
1115 htons(so->so_fport) == guest_port) {
1116 return so;
1117 }
1118 }
1119 return NULL;
1120}
1121
1122size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr,
1123 int guest_port)
1124{
1125 struct iovec iov[2];
1126 struct socket *so;
1127
1128 so = slirp_find_ctl_socket(slirp, guest_addr, guest_port);
1129
1130 if (!so || so->so_state & SS_NOFDREF) {
1131 return 0;
1132 }
1133
1134 if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) {
1135 return 0;
1136 }
1137
1138 return sopreprbuf(so, iov, NULL);
1139}
1140
1141void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr, int guest_port,
1142 const uint8_t *buf, int size)
1143{
1144 int ret;
1145 struct socket *so = slirp_find_ctl_socket(slirp, guest_addr, guest_port);
1146
1147 if (!so)
1148 return;
1149
1150 ret = soreadbuf(so, (const char *)buf, size);
1151
1152 if (ret > 0)
1153 tcp_output(sototcpcb(so));
1154}
1155
1156static int slirp_tcp_post_load(void *opaque, int version)
1157{
1158 tcp_template((struct tcpcb *)opaque);
1159
1160 return 0;
1161}
1162
1163static const VMStateDescription vmstate_slirp_tcp = {
1164 .name = "slirp-tcp",
1165 .version_id = 0,
1166 .post_load = slirp_tcp_post_load,
1167 .fields = (VMStateField[]) {
1168 VMSTATE_INT16(t_state, struct tcpcb),
1169 VMSTATE_INT16_ARRAY(t_timer, struct tcpcb, TCPT_NTIMERS),
1170 VMSTATE_INT16(t_rxtshift, struct tcpcb),
1171 VMSTATE_INT16(t_rxtcur, struct tcpcb),
1172 VMSTATE_INT16(t_dupacks, struct tcpcb),
1173 VMSTATE_UINT16(t_maxseg, struct tcpcb),
1174 VMSTATE_UINT8(t_force, struct tcpcb),
1175 VMSTATE_UINT16(t_flags, struct tcpcb),
1176 VMSTATE_UINT32(snd_una, struct tcpcb),
1177 VMSTATE_UINT32(snd_nxt, struct tcpcb),
1178 VMSTATE_UINT32(snd_up, struct tcpcb),
1179 VMSTATE_UINT32(snd_wl1, struct tcpcb),
1180 VMSTATE_UINT32(snd_wl2, struct tcpcb),
1181 VMSTATE_UINT32(iss, struct tcpcb),
1182 VMSTATE_UINT32(snd_wnd, struct tcpcb),
1183 VMSTATE_UINT32(rcv_wnd, struct tcpcb),
1184 VMSTATE_UINT32(rcv_nxt, struct tcpcb),
1185 VMSTATE_UINT32(rcv_up, struct tcpcb),
1186 VMSTATE_UINT32(irs, struct tcpcb),
1187 VMSTATE_UINT32(rcv_adv, struct tcpcb),
1188 VMSTATE_UINT32(snd_max, struct tcpcb),
1189 VMSTATE_UINT32(snd_cwnd, struct tcpcb),
1190 VMSTATE_UINT32(snd_ssthresh, struct tcpcb),
1191 VMSTATE_INT16(t_idle, struct tcpcb),
1192 VMSTATE_INT16(t_rtt, struct tcpcb),
1193 VMSTATE_UINT32(t_rtseq, struct tcpcb),
1194 VMSTATE_INT16(t_srtt, struct tcpcb),
1195 VMSTATE_INT16(t_rttvar, struct tcpcb),
1196 VMSTATE_UINT16(t_rttmin, struct tcpcb),
1197 VMSTATE_UINT32(max_sndwnd, struct tcpcb),
1198 VMSTATE_UINT8(t_oobflags, struct tcpcb),
1199 VMSTATE_UINT8(t_iobc, struct tcpcb),
1200 VMSTATE_INT16(t_softerror, struct tcpcb),
1201 VMSTATE_UINT8(snd_scale, struct tcpcb),
1202 VMSTATE_UINT8(rcv_scale, struct tcpcb),
1203 VMSTATE_UINT8(request_r_scale, struct tcpcb),
1204 VMSTATE_UINT8(requested_s_scale, struct tcpcb),
1205 VMSTATE_UINT32(ts_recent, struct tcpcb),
1206 VMSTATE_UINT32(ts_recent_age, struct tcpcb),
1207 VMSTATE_UINT32(last_ack_sent, struct tcpcb),
1208 VMSTATE_END_OF_LIST()
1209 }
1210};
1211
1212
1213
1214
1215
1216struct sbuf_tmp {
1217 struct sbuf *parent;
1218 uint32_t roff, woff;
1219};
1220
1221static int sbuf_tmp_pre_save(void *opaque)
1222{
1223 struct sbuf_tmp *tmp = opaque;
1224 tmp->woff = tmp->parent->sb_wptr - tmp->parent->sb_data;
1225 tmp->roff = tmp->parent->sb_rptr - tmp->parent->sb_data;
1226
1227 return 0;
1228}
1229
1230static int sbuf_tmp_post_load(void *opaque, int version)
1231{
1232 struct sbuf_tmp *tmp = opaque;
1233 uint32_t requested_len = tmp->parent->sb_datalen;
1234
1235
1236 sbreserve(tmp->parent, tmp->parent->sb_datalen);
1237
1238 if (tmp->parent->sb_datalen != requested_len) {
1239 return -ENOMEM;
1240 }
1241 if (tmp->woff >= requested_len ||
1242 tmp->roff >= requested_len) {
1243 error_report("invalid sbuf offsets r/w=%u/%u len=%u",
1244 tmp->roff, tmp->woff, requested_len);
1245 return -EINVAL;
1246 }
1247
1248 tmp->parent->sb_wptr = tmp->parent->sb_data + tmp->woff;
1249 tmp->parent->sb_rptr = tmp->parent->sb_data + tmp->roff;
1250
1251 return 0;
1252}
1253
1254
1255static const VMStateDescription vmstate_slirp_sbuf_tmp = {
1256 .name = "slirp-sbuf-tmp",
1257 .post_load = sbuf_tmp_post_load,
1258 .pre_save = sbuf_tmp_pre_save,
1259 .version_id = 0,
1260 .fields = (VMStateField[]) {
1261 VMSTATE_UINT32(woff, struct sbuf_tmp),
1262 VMSTATE_UINT32(roff, struct sbuf_tmp),
1263 VMSTATE_END_OF_LIST()
1264 }
1265};
1266
1267static const VMStateDescription vmstate_slirp_sbuf = {
1268 .name = "slirp-sbuf",
1269 .version_id = 0,
1270 .fields = (VMStateField[]) {
1271 VMSTATE_UINT32(sb_cc, struct sbuf),
1272 VMSTATE_UINT32(sb_datalen, struct sbuf),
1273 VMSTATE_WITH_TMP(struct sbuf, struct sbuf_tmp, vmstate_slirp_sbuf_tmp),
1274 VMSTATE_VBUFFER_UINT32(sb_data, struct sbuf, 0, NULL, sb_datalen),
1275 VMSTATE_END_OF_LIST()
1276 }
1277};
1278
1279static bool slirp_older_than_v4(void *opaque, int version_id)
1280{
1281 return version_id < 4;
1282}
1283
1284static bool slirp_family_inet(void *opaque, int version_id)
1285{
1286 union slirp_sockaddr *ssa = (union slirp_sockaddr *)opaque;
1287 return ssa->ss.ss_family == AF_INET;
1288}
1289
1290static int slirp_socket_pre_load(void *opaque)
1291{
1292 struct socket *so = opaque;
1293 if (tcp_attach(so) < 0) {
1294 return -ENOMEM;
1295 }
1296
1297 so->so_ffamily = AF_INET;
1298 so->so_lfamily = AF_INET;
1299 return 0;
1300}
1301
1302#ifndef _WIN32
1303#define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_UINT32_TEST(f, s, t)
1304#else
1305
1306#define VMSTATE_SIN4_ADDR(f, s, t) VMSTATE_SINGLE_TEST(f, s, t, 0, \
1307 vmstate_info_uint32, u_long)
1308#endif
1309
1310
1311
1312
1313
1314typedef struct SS_FamilyTmpStruct {
1315 union slirp_sockaddr *parent;
1316 uint16_t portable_family;
1317} SS_FamilyTmpStruct;
1318
1319#define SS_FAMILY_MIG_IPV4 2
1320#define SS_FAMILY_MIG_IPV6 10
1321#define SS_FAMILY_MIG_OTHER 0xffff
1322
1323static int ss_family_pre_save(void *opaque)
1324{
1325 SS_FamilyTmpStruct *tss = opaque;
1326
1327 tss->portable_family = SS_FAMILY_MIG_OTHER;
1328
1329 if (tss->parent->ss.ss_family == AF_INET) {
1330 tss->portable_family = SS_FAMILY_MIG_IPV4;
1331 } else if (tss->parent->ss.ss_family == AF_INET6) {
1332 tss->portable_family = SS_FAMILY_MIG_IPV6;
1333 }
1334
1335 return 0;
1336}
1337
1338static int ss_family_post_load(void *opaque, int version_id)
1339{
1340 SS_FamilyTmpStruct *tss = opaque;
1341
1342 switch (tss->portable_family) {
1343 case SS_FAMILY_MIG_IPV4:
1344 tss->parent->ss.ss_family = AF_INET;
1345 break;
1346 case SS_FAMILY_MIG_IPV6:
1347 case 23:
1348 case 28:
1349 tss->parent->ss.ss_family = AF_INET6;
1350 break;
1351 default:
1352 error_report("invalid ss_family type %x", tss->portable_family);
1353 return -EINVAL;
1354 }
1355
1356 return 0;
1357}
1358
1359static const VMStateDescription vmstate_slirp_ss_family = {
1360 .name = "slirp-socket-addr/ss_family",
1361 .pre_save = ss_family_pre_save,
1362 .post_load = ss_family_post_load,
1363 .fields = (VMStateField[]) {
1364 VMSTATE_UINT16(portable_family, SS_FamilyTmpStruct),
1365 VMSTATE_END_OF_LIST()
1366 }
1367};
1368
1369static const VMStateDescription vmstate_slirp_socket_addr = {
1370 .name = "slirp-socket-addr",
1371 .version_id = 4,
1372 .fields = (VMStateField[]) {
1373 VMSTATE_WITH_TMP(union slirp_sockaddr, SS_FamilyTmpStruct,
1374 vmstate_slirp_ss_family),
1375 VMSTATE_SIN4_ADDR(sin.sin_addr.s_addr, union slirp_sockaddr,
1376 slirp_family_inet),
1377 VMSTATE_UINT16_TEST(sin.sin_port, union slirp_sockaddr,
1378 slirp_family_inet),
1379
1380#if 0
1381
1382 VMSTATE_BUFFER_TEST(sin6.sin6_addr, union slirp_sockaddr,
1383 slirp_family_inet6),
1384 VMSTATE_UINT16_TEST(sin6.sin6_port, union slirp_sockaddr,
1385 slirp_family_inet6),
1386 VMSTATE_UINT32_TEST(sin6.sin6_flowinfo, union slirp_sockaddr,
1387 slirp_family_inet6),
1388 VMSTATE_UINT32_TEST(sin6.sin6_scope_id, union slirp_sockaddr,
1389 slirp_family_inet6),
1390#endif
1391
1392 VMSTATE_END_OF_LIST()
1393 }
1394};
1395
1396static const VMStateDescription vmstate_slirp_socket = {
1397 .name = "slirp-socket",
1398 .version_id = 4,
1399 .pre_load = slirp_socket_pre_load,
1400 .fields = (VMStateField[]) {
1401 VMSTATE_UINT32(so_urgc, struct socket),
1402
1403 VMSTATE_SIN4_ADDR(so_faddr.s_addr, struct socket,
1404 slirp_older_than_v4),
1405 VMSTATE_SIN4_ADDR(so_laddr.s_addr, struct socket,
1406 slirp_older_than_v4),
1407 VMSTATE_UINT16_TEST(so_fport, struct socket, slirp_older_than_v4),
1408 VMSTATE_UINT16_TEST(so_lport, struct socket, slirp_older_than_v4),
1409
1410 VMSTATE_STRUCT(fhost, struct socket, 4, vmstate_slirp_socket_addr,
1411 union slirp_sockaddr),
1412 VMSTATE_STRUCT(lhost, struct socket, 4, vmstate_slirp_socket_addr,
1413 union slirp_sockaddr),
1414
1415 VMSTATE_UINT8(so_iptos, struct socket),
1416 VMSTATE_UINT8(so_emu, struct socket),
1417 VMSTATE_UINT8(so_type, struct socket),
1418 VMSTATE_INT32(so_state, struct socket),
1419 VMSTATE_STRUCT(so_rcv, struct socket, 0, vmstate_slirp_sbuf,
1420 struct sbuf),
1421 VMSTATE_STRUCT(so_snd, struct socket, 0, vmstate_slirp_sbuf,
1422 struct sbuf),
1423 VMSTATE_STRUCT_POINTER(so_tcpcb, struct socket, vmstate_slirp_tcp,
1424 struct tcpcb),
1425 VMSTATE_END_OF_LIST()
1426 }
1427};
1428
1429static const VMStateDescription vmstate_slirp_bootp_client = {
1430 .name = "slirp_bootpclient",
1431 .fields = (VMStateField[]) {
1432 VMSTATE_UINT16(allocated, BOOTPClient),
1433 VMSTATE_BUFFER(macaddr, BOOTPClient),
1434 VMSTATE_END_OF_LIST()
1435 }
1436};
1437
1438static const VMStateDescription vmstate_slirp = {
1439 .name = "slirp",
1440 .version_id = 4,
1441 .fields = (VMStateField[]) {
1442 VMSTATE_UINT16_V(ip_id, Slirp, 2),
1443 VMSTATE_STRUCT_ARRAY(bootp_clients, Slirp, NB_BOOTP_CLIENTS, 3,
1444 vmstate_slirp_bootp_client, BOOTPClient),
1445 VMSTATE_END_OF_LIST()
1446 }
1447};
1448
1449static void slirp_state_save(QEMUFile *f, void *opaque)
1450{
1451 Slirp *slirp = opaque;
1452 struct ex_list *ex_ptr;
1453
1454 for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
1455 if (ex_ptr->ex_pty == 3) {
1456 struct socket *so;
1457 so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr,
1458 ntohs(ex_ptr->ex_fport));
1459 if (!so)
1460 continue;
1461
1462 qemu_put_byte(f, 42);
1463 vmstate_save_state(f, &vmstate_slirp_socket, so, NULL);
1464 }
1465 qemu_put_byte(f, 0);
1466
1467 vmstate_save_state(f, &vmstate_slirp, slirp, NULL);
1468}
1469
1470
1471static int slirp_state_load(QEMUFile *f, void *opaque, int version_id)
1472{
1473 Slirp *slirp = opaque;
1474 struct ex_list *ex_ptr;
1475
1476 while (qemu_get_byte(f)) {
1477 int ret;
1478 struct socket *so = socreate(slirp);
1479
1480 ret = vmstate_load_state(f, &vmstate_slirp_socket, so, version_id);
1481
1482 if (ret < 0)
1483 return ret;
1484
1485 if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) !=
1486 slirp->vnetwork_addr.s_addr) {
1487 return -EINVAL;
1488 }
1489 for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1490 if (ex_ptr->ex_pty == 3 &&
1491 so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr &&
1492 so->so_fport == ex_ptr->ex_fport) {
1493 break;
1494 }
1495 }
1496 if (!ex_ptr)
1497 return -EINVAL;
1498
1499 so->extra = (void *)ex_ptr->ex_exec;
1500 }
1501
1502 return vmstate_load_state(f, &vmstate_slirp, slirp, version_id);
1503}
1504