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1 /*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "qemu/osdep.h"
25
26 #include "net/net.h"
27 #include "clients.h"
28 #include "monitor/monitor.h"
29 #include "qapi/error.h"
30 #include "qemu/error-report.h"
31 #include "qemu/option.h"
32 #include "qemu/sockets.h"
33 #include "qemu/iov.h"
34 #include "qemu/main-loop.h"
35
36 typedef struct NetSocketState {
37 NetClientState nc;
38 int listen_fd;
39 int fd;
40 SocketReadState rs;
41 unsigned int send_index; /* number of bytes sent (only SOCK_STREAM) */
42 struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
43 IOHandler *send_fn; /* differs between SOCK_STREAM/SOCK_DGRAM */
44 bool read_poll; /* waiting to receive data? */
45 bool write_poll; /* waiting to transmit data? */
46 } NetSocketState;
47
48 static void net_socket_accept(void *opaque);
49 static void net_socket_writable(void *opaque);
50
51 static void net_socket_update_fd_handler(NetSocketState *s)
52 {
53 qemu_set_fd_handler(s->fd,
54 s->read_poll ? s->send_fn : NULL,
55 s->write_poll ? net_socket_writable : NULL,
56 s);
57 }
58
59 static void net_socket_read_poll(NetSocketState *s, bool enable)
60 {
61 s->read_poll = enable;
62 net_socket_update_fd_handler(s);
63 }
64
65 static void net_socket_write_poll(NetSocketState *s, bool enable)
66 {
67 s->write_poll = enable;
68 net_socket_update_fd_handler(s);
69 }
70
71 static void net_socket_writable(void *opaque)
72 {
73 NetSocketState *s = opaque;
74
75 net_socket_write_poll(s, false);
76
77 qemu_flush_queued_packets(&s->nc);
78 }
79
80 static ssize_t net_socket_receive(NetClientState *nc, const uint8_t *buf, size_t size)
81 {
82 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
83 uint32_t len = htonl(size);
84 struct iovec iov[] = {
85 {
86 .iov_base = &len,
87 .iov_len = sizeof(len),
88 }, {
89 .iov_base = (void *)buf,
90 .iov_len = size,
91 },
92 };
93 size_t remaining;
94 ssize_t ret;
95
96 remaining = iov_size(iov, 2) - s->send_index;
97 ret = iov_send(s->fd, iov, 2, s->send_index, remaining);
98
99 if (ret == -1 && errno == EAGAIN) {
100 ret = 0; /* handled further down */
101 }
102 if (ret == -1) {
103 s->send_index = 0;
104 return -errno;
105 }
106 if (ret < (ssize_t)remaining) {
107 s->send_index += ret;
108 net_socket_write_poll(s, true);
109 return 0;
110 }
111 s->send_index = 0;
112 return size;
113 }
114
115 static ssize_t net_socket_receive_dgram(NetClientState *nc, const uint8_t *buf, size_t size)
116 {
117 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
118 ssize_t ret;
119
120 ret = RETRY_ON_EINTR(
121 s->dgram_dst.sin_family != AF_UNIX ?
122 sendto(s->fd, buf, size, 0,
123 (struct sockaddr *)&s->dgram_dst,
124 sizeof(s->dgram_dst)) :
125 send(s->fd, buf, size, 0)
126 );
127
128 if (ret == -1 && errno == EAGAIN) {
129 net_socket_write_poll(s, true);
130 return 0;
131 }
132 return ret;
133 }
134
135 static void net_socket_send_completed(NetClientState *nc, ssize_t len)
136 {
137 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
138
139 if (!s->read_poll) {
140 net_socket_read_poll(s, true);
141 }
142 }
143
144 static void net_socket_rs_finalize(SocketReadState *rs)
145 {
146 NetSocketState *s = container_of(rs, NetSocketState, rs);
147
148 if (qemu_send_packet_async(&s->nc, rs->buf,
149 rs->packet_len,
150 net_socket_send_completed) == 0) {
151 net_socket_read_poll(s, false);
152 }
153 }
154
155 static void net_socket_send(void *opaque)
156 {
157 NetSocketState *s = opaque;
158 int size;
159 int ret;
160 QEMU_UNINITIALIZED uint8_t buf1[NET_BUFSIZE];
161 const uint8_t *buf;
162
163 size = recv(s->fd, buf1, sizeof(buf1), 0);
164 if (size < 0) {
165 if (errno != EWOULDBLOCK)
166 goto eoc;
167 } else if (size == 0) {
168 /* end of connection */
169 eoc:
170 net_socket_read_poll(s, false);
171 net_socket_write_poll(s, false);
172 if (s->listen_fd != -1) {
173 qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
174 }
175 close(s->fd);
176
177 s->fd = -1;
178 net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
179 s->nc.link_down = true;
180 qemu_set_info_str(&s->nc, "%s", "");
181
182 return;
183 }
184 buf = buf1;
185
186 ret = net_fill_rstate(&s->rs, buf, size);
187
188 if (ret == -1) {
189 goto eoc;
190 }
191 }
192
193 static void net_socket_send_dgram(void *opaque)
194 {
195 NetSocketState *s = opaque;
196 int size;
197
198 size = recv(s->fd, s->rs.buf, sizeof(s->rs.buf), 0);
199 if (size < 0)
200 return;
201 if (size == 0) {
202 /* end of connection */
203 net_socket_read_poll(s, false);
204 net_socket_write_poll(s, false);
205 return;
206 }
207 if (qemu_send_packet_async(&s->nc, s->rs.buf, size,
208 net_socket_send_completed) == 0) {
209 net_socket_read_poll(s, false);
210 }
211 }
212
213 static int net_socket_mcast_create(struct sockaddr_in *mcastaddr,
214 struct in_addr *localaddr,
215 Error **errp)
216 {
217 struct ip_mreq imr;
218 int fd;
219 int val, ret;
220 #ifdef __OpenBSD__
221 unsigned char loop;
222 #else
223 int loop;
224 #endif
225
226 if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
227 error_setg(errp, "specified mcastaddr %s (0x%08x) "
228 "does not contain a multicast address",
229 inet_ntoa(mcastaddr->sin_addr),
230 (int)ntohl(mcastaddr->sin_addr.s_addr));
231 return -1;
232 }
233
234 fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
235 if (fd < 0) {
236 error_setg_errno(errp, errno, "can't create datagram socket");
237 return -1;
238 }
239
240 /* Allow multiple sockets to bind the same multicast ip and port by setting
241 * SO_REUSEADDR. This is the only situation where SO_REUSEADDR should be set
242 * on windows. Use socket_set_fast_reuse otherwise as it sets SO_REUSEADDR
243 * only on posix systems.
244 */
245 val = 1;
246 ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
247 if (ret < 0) {
248 error_setg_errno(errp, errno,
249 "can't set socket option SO_REUSEADDR");
250 goto fail;
251 }
252
253 ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
254 if (ret < 0) {
255 error_setg_errno(errp, errno, "can't bind ip=%s to socket",
256 inet_ntoa(mcastaddr->sin_addr));
257 goto fail;
258 }
259
260 /* Add host to multicast group */
261 imr.imr_multiaddr = mcastaddr->sin_addr;
262 if (localaddr) {
263 imr.imr_interface = *localaddr;
264 } else {
265 imr.imr_interface.s_addr = htonl(INADDR_ANY);
266 }
267
268 ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
269 &imr, sizeof(struct ip_mreq));
270 if (ret < 0) {
271 error_setg_errno(errp, errno,
272 "can't add socket to multicast group %s",
273 inet_ntoa(imr.imr_multiaddr));
274 goto fail;
275 }
276
277 /* Force mcast msgs to loopback (eg. several QEMUs in same host */
278 loop = 1;
279 ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
280 &loop, sizeof(loop));
281 if (ret < 0) {
282 error_setg_errno(errp, errno,
283 "can't force multicast message to loopback");
284 goto fail;
285 }
286
287 /* If a bind address is given, only send packets from that address */
288 if (localaddr != NULL) {
289 ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
290 localaddr, sizeof(*localaddr));
291 if (ret < 0) {
292 error_setg_errno(errp, errno,
293 "can't set the default network send interface");
294 goto fail;
295 }
296 }
297
298 if (!qemu_set_blocking(fd, false, errp)) {
299 goto fail;
300 }
301
302 return fd;
303 fail:
304 if (fd >= 0)
305 close(fd);
306 return -1;
307 }
308
309 static void net_socket_cleanup(NetClientState *nc)
310 {
311 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
312 if (s->fd != -1) {
313 net_socket_read_poll(s, false);
314 net_socket_write_poll(s, false);
315 close(s->fd);
316 s->fd = -1;
317 }
318 if (s->listen_fd != -1) {
319 qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
320 close(s->listen_fd);
321 s->listen_fd = -1;
322 }
323 }
324
325 static NetClientInfo net_dgram_socket_info = {
326 .type = NET_CLIENT_DRIVER_SOCKET,
327 .size = sizeof(NetSocketState),
328 .receive = net_socket_receive_dgram,
329 .cleanup = net_socket_cleanup,
330 };
331
332 static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer,
333 const char *model,
334 const char *name,
335 int fd, int is_connected,
336 const char *mcast,
337 Error **errp)
338 {
339 struct sockaddr_in saddr;
340 int newfd;
341 NetClientState *nc;
342 NetSocketState *s;
343 SocketAddress *sa;
344 SocketAddressType sa_type;
345
346 sa = socket_local_address(fd, errp);
347 if (!sa) {
348 return NULL;
349 }
350 sa_type = sa->type;
351 qapi_free_SocketAddress(sa);
352
353 /* fd passed: multicast: "learn" dgram_dst address from bound address and save it
354 * Because this may be "shared" socket from a "master" process, datagrams would be recv()
355 * by ONLY ONE process: we must "clone" this dgram socket --jjo
356 */
357
358 if (is_connected && mcast != NULL) {
359 if (parse_host_port(&saddr, mcast, errp) < 0) {
360 goto err;
361 }
362 /* must be bound */
363 if (saddr.sin_addr.s_addr == 0) {
364 error_setg(errp, "can't setup multicast destination address");
365 goto err;
366 }
367 /* clone dgram socket */
368 newfd = net_socket_mcast_create(&saddr, NULL, errp);
369 if (newfd < 0) {
370 goto err;
371 }
372 /* clone newfd to fd, close newfd */
373 dup2(newfd, fd);
374 close(newfd);
375
376 }
377
378 nc = qemu_new_net_client(&net_dgram_socket_info, peer, model, name);
379
380 s = DO_UPCAST(NetSocketState, nc, nc);
381
382 s->fd = fd;
383 s->listen_fd = -1;
384 s->send_fn = net_socket_send_dgram;
385 net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
386 net_socket_read_poll(s, true);
387
388 /* mcast: save bound address as dst */
389 if (is_connected && mcast != NULL) {
390 s->dgram_dst = saddr;
391 qemu_set_info_str(nc, "socket: fd=%d (cloned mcast=%s:%d)", fd,
392 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
393 } else {
394 if (sa_type == SOCKET_ADDRESS_TYPE_UNIX) {
395 s->dgram_dst.sin_family = AF_UNIX;
396 }
397
398 qemu_set_info_str(nc, "socket: fd=%d %s", fd,
399 SocketAddressType_str(sa_type));
400 }
401
402 return s;
403
404 err:
405 close(fd);
406 return NULL;
407 }
408
409 static void net_socket_connect(void *opaque)
410 {
411 NetSocketState *s = opaque;
412 s->send_fn = net_socket_send;
413 net_socket_read_poll(s, true);
414 }
415
416 static NetClientInfo net_socket_info = {
417 .type = NET_CLIENT_DRIVER_SOCKET,
418 .size = sizeof(NetSocketState),
419 .receive = net_socket_receive,
420 .cleanup = net_socket_cleanup,
421 };
422
423 static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
424 const char *model,
425 const char *name,
426 int fd, int is_connected)
427 {
428 NetClientState *nc;
429 NetSocketState *s;
430
431 nc = qemu_new_net_client(&net_socket_info, peer, model, name);
432
433 qemu_set_info_str(nc, "socket: fd=%d", fd);
434
435 s = DO_UPCAST(NetSocketState, nc, nc);
436
437 s->fd = fd;
438 s->listen_fd = -1;
439 net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
440
441 /* Disable Nagle algorithm on TCP sockets to reduce latency */
442 socket_set_nodelay(fd);
443
444 if (is_connected) {
445 net_socket_connect(s);
446 } else {
447 qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
448 }
449 return s;
450 }
451
452 static int net_socket_fd_check(int fd, Error **errp)
453 {
454 int so_type, optlen = sizeof(so_type);
455
456 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
457 (socklen_t *)&optlen) < 0) {
458 error_setg(errp, "can't get socket option SO_TYPE");
459 return -1;
460 }
461 if (so_type != SOCK_DGRAM && so_type != SOCK_STREAM) {
462 error_setg(errp, "socket type=%d for fd=%d must be either"
463 " SOCK_DGRAM or SOCK_STREAM", so_type, fd);
464 return -1;
465 }
466 return so_type;
467 }
468
469 static void net_socket_accept(void *opaque)
470 {
471 NetSocketState *s = opaque;
472 struct sockaddr_in saddr;
473 socklen_t len;
474 int fd;
475
476 for(;;) {
477 len = sizeof(saddr);
478 fd = qemu_accept(s->listen_fd, (struct sockaddr *)&saddr, &len);
479 if (fd < 0 && errno != EINTR) {
480 return;
481 } else if (fd >= 0) {
482 qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
483 break;
484 }
485 }
486
487 s->fd = fd;
488 s->nc.link_down = false;
489 net_socket_connect(s);
490 qemu_set_info_str(&s->nc, "socket: connection from %s:%d",
491 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
492 }
493
494 static int net_socket_listen_init(NetClientState *peer,
495 const char *model,
496 const char *name,
497 const char *host_str,
498 Error **errp)
499 {
500 NetClientState *nc;
501 NetSocketState *s;
502 struct sockaddr_in saddr;
503 int fd, ret;
504
505 if (parse_host_port(&saddr, host_str, errp) < 0) {
506 return -1;
507 }
508
509 fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
510 if (fd < 0) {
511 error_setg_errno(errp, errno, "can't create stream socket");
512 return -1;
513 }
514 if (!qemu_set_blocking(fd, false, errp)) {
515 close(fd);
516 return -1;
517 }
518
519 socket_set_fast_reuse(fd);
520
521 ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
522 if (ret < 0) {
523 error_setg_errno(errp, errno, "can't bind ip=%s to socket",
524 inet_ntoa(saddr.sin_addr));
525 close(fd);
526 return -1;
527 }
528 ret = listen(fd, 0);
529 if (ret < 0) {
530 error_setg_errno(errp, errno, "can't listen on socket");
531 close(fd);
532 return -1;
533 }
534
535 nc = qemu_new_net_client(&net_socket_info, peer, model, name);
536 s = DO_UPCAST(NetSocketState, nc, nc);
537 s->fd = -1;
538 s->listen_fd = fd;
539 s->nc.link_down = true;
540 net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
541
542 qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
543 return 0;
544 }
545
546 static int net_socket_connect_init(NetClientState *peer,
547 const char *model,
548 const char *name,
549 const char *host_str,
550 Error **errp)
551 {
552 NetSocketState *s;
553 int fd, connected, ret;
554 struct sockaddr_in saddr;
555
556 if (parse_host_port(&saddr, host_str, errp) < 0) {
557 return -1;
558 }
559
560 fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
561 if (fd < 0) {
562 error_setg_errno(errp, errno, "can't create stream socket");
563 return -1;
564 }
565 if (!qemu_set_blocking(fd, false, errp)) {
566 close(fd);
567 return -1;
568 }
569
570 connected = 0;
571 for(;;) {
572 ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
573 if (ret < 0) {
574 if (errno == EINTR || errno == EWOULDBLOCK) {
575 /* continue */
576 } else if (errno == EINPROGRESS ||
577 errno == EALREADY) {
578 break;
579 } else {
580 error_setg_errno(errp, errno, "can't connect socket");
581 close(fd);
582 return -1;
583 }
584 } else {
585 connected = 1;
586 break;
587 }
588 }
589 s = net_socket_fd_init_stream(peer, model, name, fd, connected);
590 if (!s) {
591 return -1;
592 }
593
594 qemu_set_info_str(&s->nc, "socket: connect to %s:%d",
595 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
596 return 0;
597 }
598
599 static int net_socket_mcast_init(NetClientState *peer,
600 const char *model,
601 const char *name,
602 const char *host_str,
603 const char *localaddr_str,
604 Error **errp)
605 {
606 NetSocketState *s;
607 int fd;
608 struct sockaddr_in saddr;
609 struct in_addr localaddr, *param_localaddr;
610
611 if (parse_host_port(&saddr, host_str, errp) < 0) {
612 return -1;
613 }
614
615 if (localaddr_str != NULL) {
616 if (inet_aton(localaddr_str, &localaddr) == 0) {
617 error_setg(errp, "localaddr '%s' is not a valid IPv4 address",
618 localaddr_str);
619 return -1;
620 }
621 param_localaddr = &localaddr;
622 } else {
623 param_localaddr = NULL;
624 }
625
626 fd = net_socket_mcast_create(&saddr, param_localaddr, errp);
627 if (fd < 0) {
628 return -1;
629 }
630
631 s = net_socket_fd_init_dgram(peer, model, name, fd, 0, NULL, errp);
632 if (!s) {
633 return -1;
634 }
635
636 s->dgram_dst = saddr;
637
638 qemu_set_info_str(&s->nc, "socket: mcast=%s:%d",
639 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
640 return 0;
641
642 }
643
644 static int net_socket_udp_init(NetClientState *peer,
645 const char *model,
646 const char *name,
647 const char *rhost,
648 const char *lhost,
649 Error **errp)
650 {
651 NetSocketState *s;
652 int fd, ret;
653 struct sockaddr_in laddr, raddr;
654
655 if (parse_host_port(&laddr, lhost, errp) < 0) {
656 return -1;
657 }
658
659 if (parse_host_port(&raddr, rhost, errp) < 0) {
660 return -1;
661 }
662
663 fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
664 if (fd < 0) {
665 error_setg_errno(errp, errno, "can't create datagram socket");
666 return -1;
667 }
668
669 ret = socket_set_fast_reuse(fd);
670 if (ret < 0) {
671 error_setg_errno(errp, errno,
672 "can't set socket option SO_REUSEADDR");
673 close(fd);
674 return -1;
675 }
676 ret = bind(fd, (struct sockaddr *)&laddr, sizeof(laddr));
677 if (ret < 0) {
678 error_setg_errno(errp, errno, "can't bind ip=%s to socket",
679 inet_ntoa(laddr.sin_addr));
680 close(fd);
681 return -1;
682 }
683 if (!qemu_set_blocking(fd, false, errp)) {
684 close(fd);
685 return -1;
686 }
687
688 s = net_socket_fd_init_dgram(peer, model, name, fd, 0, NULL, errp);
689 if (!s) {
690 return -1;
691 }
692
693 s->dgram_dst = raddr;
694
695 qemu_set_info_str(&s->nc, "socket: udp=%s:%d", inet_ntoa(raddr.sin_addr),
696 ntohs(raddr.sin_port));
697 return 0;
698 }
699
700 int net_init_socket(const Netdev *netdev, const char *name,
701 NetClientState *peer, Error **errp)
702 {
703 const NetdevSocketOptions *sock;
704
705 assert(netdev->type == NET_CLIENT_DRIVER_SOCKET);
706 sock = &netdev->u.socket;
707
708 if (!!sock->fd + !!sock->listen + !!sock->connect + !!sock->mcast +
709 !!sock->udp != 1) {
710 error_setg(errp, "exactly one of listen=, connect=, mcast= or udp="
711 " is required");
712 return -1;
713 }
714
715 if (sock->localaddr && !sock->mcast && !sock->udp) {
716 error_setg(errp, "localaddr= is only valid with mcast= or udp=");
717 return -1;
718 }
719
720 if (sock->fd) {
721 int fd, so_type;
722
723 fd = monitor_fd_param(monitor_cur(), sock->fd, errp);
724 if (fd == -1) {
725 return -1;
726 }
727 so_type = net_socket_fd_check(fd, errp);
728 if (so_type < 0) {
729 return -1;
730 }
731 if (!qemu_set_blocking(fd, false, errp)) {
732 return -1;
733 }
734 switch (so_type) {
735 case SOCK_DGRAM:
736 if (!net_socket_fd_init_dgram(peer, "socket", name, fd, 1,
737 sock->mcast, errp)) {
738 return -1;
739 }
740 break;
741 case SOCK_STREAM:
742 if (!net_socket_fd_init_stream(peer, "socket", name, fd, 1)) {
743 return -1;
744 }
745 break;
746 }
747 return 0;
748 }
749
750 if (sock->listen) {
751 if (net_socket_listen_init(peer, "socket", name, sock->listen, errp)
752 < 0) {
753 return -1;
754 }
755 return 0;
756 }
757
758 if (sock->connect) {
759 if (net_socket_connect_init(peer, "socket", name, sock->connect, errp)
760 < 0) {
761 return -1;
762 }
763 return 0;
764 }
765
766 if (sock->mcast) {
767 /* if sock->localaddr is missing, it has been initialized to "all bits
768 * zero" */
769 if (net_socket_mcast_init(peer, "socket", name, sock->mcast,
770 sock->localaddr, errp) < 0) {
771 return -1;
772 }
773 return 0;
774 }
775
776 assert(sock->udp);
777 if (!sock->localaddr) {
778 error_setg(errp, "localaddr= is mandatory with udp=");
779 return -1;
780 }
781 if (net_socket_udp_init(peer, "socket", name, sock->udp, sock->localaddr,
782 errp) < 0) {
783 return -1;
784 }
785 return 0;
786 }