4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
24 #include "qemu/osdep.h"
28 #include "monitor/monitor.h"
29 #include "qapi/error.h"
30 #include "qemu-common.h"
31 #include "qemu/error-report.h"
32 #include "qemu/option.h"
33 #include "qemu/sockets.h"
35 #include "qemu/main-loop.h"
37 typedef struct NetSocketState {
42 unsigned int send_index; /* number of bytes sent (only SOCK_STREAM) */
43 struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
44 IOHandler *send_fn; /* differs between SOCK_STREAM/SOCK_DGRAM */
45 bool read_poll; /* waiting to receive data? */
46 bool write_poll; /* waiting to transmit data? */
49 static void net_socket_accept(void *opaque);
50 static void net_socket_writable(void *opaque);
52 static void net_socket_update_fd_handler(NetSocketState *s)
54 qemu_set_fd_handler(s->fd,
55 s->read_poll ? s->send_fn : NULL,
56 s->write_poll ? net_socket_writable : NULL,
60 static void net_socket_read_poll(NetSocketState *s, bool enable)
62 s->read_poll = enable;
63 net_socket_update_fd_handler(s);
66 static void net_socket_write_poll(NetSocketState *s, bool enable)
68 s->write_poll = enable;
69 net_socket_update_fd_handler(s);
72 static void net_socket_writable(void *opaque)
74 NetSocketState *s = opaque;
76 net_socket_write_poll(s, false);
78 qemu_flush_queued_packets(&s->nc);
81 static ssize_t net_socket_receive(NetClientState *nc, const uint8_t *buf, size_t size)
83 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
84 uint32_t len = htonl(size);
85 struct iovec iov[] = {
88 .iov_len = sizeof(len),
90 .iov_base = (void *)buf,
97 remaining = iov_size(iov, 2) - s->send_index;
98 ret = iov_send(s->fd, iov, 2, s->send_index, remaining);
100 if (ret == -1 && errno == EAGAIN) {
101 ret = 0; /* handled further down */
107 if (ret < (ssize_t)remaining) {
108 s->send_index += ret;
109 net_socket_write_poll(s, true);
116 static ssize_t net_socket_receive_dgram(NetClientState *nc, const uint8_t *buf, size_t size)
118 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
122 ret = qemu_sendto(s->fd, buf, size, 0,
123 (struct sockaddr *)&s->dgram_dst,
124 sizeof(s->dgram_dst));
125 } while (ret == -1 && errno == EINTR);
127 if (ret == -1 && errno == EAGAIN) {
128 net_socket_write_poll(s, true);
134 static void net_socket_send_completed(NetClientState *nc, ssize_t len)
136 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
139 net_socket_read_poll(s, true);
143 static void net_socket_rs_finalize(SocketReadState *rs)
145 NetSocketState *s = container_of(rs, NetSocketState, rs);
147 if (qemu_send_packet_async(&s->nc, rs->buf,
149 net_socket_send_completed) == 0) {
150 net_socket_read_poll(s, false);
154 static void net_socket_send(void *opaque)
156 NetSocketState *s = opaque;
159 uint8_t buf1[NET_BUFSIZE];
162 size = qemu_recv(s->fd, buf1, sizeof(buf1), 0);
164 if (errno != EWOULDBLOCK)
166 } else if (size == 0) {
167 /* end of connection */
169 net_socket_read_poll(s, false);
170 net_socket_write_poll(s, false);
171 if (s->listen_fd != -1) {
172 qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
177 net_socket_rs_init(&s->rs, net_socket_rs_finalize);
178 s->nc.link_down = true;
179 memset(s->nc.info_str, 0, sizeof(s->nc.info_str));
185 ret = net_fill_rstate(&s->rs, buf, size);
192 static void net_socket_send_dgram(void *opaque)
194 NetSocketState *s = opaque;
197 size = qemu_recv(s->fd, s->rs.buf, sizeof(s->rs.buf), 0);
201 /* end of connection */
202 net_socket_read_poll(s, false);
203 net_socket_write_poll(s, false);
206 if (qemu_send_packet_async(&s->nc, s->rs.buf, size,
207 net_socket_send_completed) == 0) {
208 net_socket_read_poll(s, false);
212 static int net_socket_mcast_create(struct sockaddr_in *mcastaddr, struct in_addr *localaddr)
223 if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
224 fprintf(stderr, "qemu: error: specified mcastaddr \"%s\" (0x%08x) "
225 "does not contain a multicast address\n",
226 inet_ntoa(mcastaddr->sin_addr),
227 (int)ntohl(mcastaddr->sin_addr.s_addr));
231 fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
233 perror("socket(PF_INET, SOCK_DGRAM)");
237 /* Allow multiple sockets to bind the same multicast ip and port by setting
238 * SO_REUSEADDR. This is the only situation where SO_REUSEADDR should be set
239 * on windows. Use socket_set_fast_reuse otherwise as it sets SO_REUSEADDR
240 * only on posix systems.
243 ret = qemu_setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
245 perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
249 ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
255 /* Add host to multicast group */
256 imr.imr_multiaddr = mcastaddr->sin_addr;
258 imr.imr_interface = *localaddr;
260 imr.imr_interface.s_addr = htonl(INADDR_ANY);
263 ret = qemu_setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
264 &imr, sizeof(struct ip_mreq));
266 perror("setsockopt(IP_ADD_MEMBERSHIP)");
270 /* Force mcast msgs to loopback (eg. several QEMUs in same host */
272 ret = qemu_setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
273 &loop, sizeof(loop));
275 perror("setsockopt(SOL_IP, IP_MULTICAST_LOOP)");
279 /* If a bind address is given, only send packets from that address */
280 if (localaddr != NULL) {
281 ret = qemu_setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
282 localaddr, sizeof(*localaddr));
284 perror("setsockopt(IP_MULTICAST_IF)");
289 qemu_set_nonblock(fd);
297 static void net_socket_cleanup(NetClientState *nc)
299 NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
301 net_socket_read_poll(s, false);
302 net_socket_write_poll(s, false);
306 if (s->listen_fd != -1) {
307 qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
308 closesocket(s->listen_fd);
313 static NetClientInfo net_dgram_socket_info = {
314 .type = NET_CLIENT_DRIVER_SOCKET,
315 .size = sizeof(NetSocketState),
316 .receive = net_socket_receive_dgram,
317 .cleanup = net_socket_cleanup,
320 static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer,
323 int fd, int is_connected)
325 struct sockaddr_in saddr;
327 socklen_t saddr_len = sizeof(saddr);
331 /* fd passed: multicast: "learn" dgram_dst address from bound address and save it
332 * Because this may be "shared" socket from a "master" process, datagrams would be recv()
333 * by ONLY ONE process: we must "clone" this dgram socket --jjo
337 if (getsockname(fd, (struct sockaddr *) &saddr, &saddr_len) == 0) {
339 if (saddr.sin_addr.s_addr == 0) {
340 fprintf(stderr, "qemu: error: init_dgram: fd=%d unbound, "
341 "cannot setup multicast dst addr\n", fd);
344 /* clone dgram socket */
345 newfd = net_socket_mcast_create(&saddr, NULL);
347 /* error already reported by net_socket_mcast_create() */
350 /* clone newfd to fd, close newfd */
356 "qemu: error: init_dgram: fd=%d failed getsockname(): %s\n",
357 fd, strerror(errno));
362 nc = qemu_new_net_client(&net_dgram_socket_info, peer, model, name);
364 s = DO_UPCAST(NetSocketState, nc, nc);
368 s->send_fn = net_socket_send_dgram;
369 net_socket_rs_init(&s->rs, net_socket_rs_finalize);
370 net_socket_read_poll(s, true);
372 /* mcast: save bound address as dst */
374 s->dgram_dst = saddr;
375 snprintf(nc->info_str, sizeof(nc->info_str),
376 "socket: fd=%d (cloned mcast=%s:%d)",
377 fd, inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
379 snprintf(nc->info_str, sizeof(nc->info_str),
380 "socket: fd=%d", fd);
390 static void net_socket_connect(void *opaque)
392 NetSocketState *s = opaque;
393 s->send_fn = net_socket_send;
394 net_socket_read_poll(s, true);
397 static NetClientInfo net_socket_info = {
398 .type = NET_CLIENT_DRIVER_SOCKET,
399 .size = sizeof(NetSocketState),
400 .receive = net_socket_receive,
401 .cleanup = net_socket_cleanup,
404 static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
407 int fd, int is_connected)
412 nc = qemu_new_net_client(&net_socket_info, peer, model, name);
414 snprintf(nc->info_str, sizeof(nc->info_str), "socket: fd=%d", fd);
416 s = DO_UPCAST(NetSocketState, nc, nc);
420 net_socket_rs_init(&s->rs, net_socket_rs_finalize);
422 /* Disable Nagle algorithm on TCP sockets to reduce latency */
423 socket_set_nodelay(fd);
426 net_socket_connect(s);
428 qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
433 static NetSocketState *net_socket_fd_init(NetClientState *peer,
434 const char *model, const char *name,
435 int fd, int is_connected)
437 int so_type = -1, optlen=sizeof(so_type);
439 if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
440 (socklen_t *)&optlen)< 0) {
441 fprintf(stderr, "qemu: error: getsockopt(SO_TYPE) for fd=%d failed\n",
448 return net_socket_fd_init_dgram(peer, model, name, fd, is_connected);
450 return net_socket_fd_init_stream(peer, model, name, fd, is_connected);
452 /* who knows ... this could be a eg. a pty, do warn and continue as stream */
453 fprintf(stderr, "qemu: warning: socket type=%d for fd=%d is not SOCK_DGRAM or SOCK_STREAM\n", so_type, fd);
454 return net_socket_fd_init_stream(peer, model, name, fd, is_connected);
459 static void net_socket_accept(void *opaque)
461 NetSocketState *s = opaque;
462 struct sockaddr_in saddr;
468 fd = qemu_accept(s->listen_fd, (struct sockaddr *)&saddr, &len);
469 if (fd < 0 && errno != EINTR) {
471 } else if (fd >= 0) {
472 qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
478 s->nc.link_down = false;
479 net_socket_connect(s);
480 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
481 "socket: connection from %s:%d",
482 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
485 static int net_socket_listen_init(NetClientState *peer,
488 const char *host_str)
492 struct sockaddr_in saddr;
495 if (parse_host_port(&saddr, host_str) < 0)
498 fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
503 qemu_set_nonblock(fd);
505 socket_set_fast_reuse(fd);
507 ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
520 nc = qemu_new_net_client(&net_socket_info, peer, model, name);
521 s = DO_UPCAST(NetSocketState, nc, nc);
524 s->nc.link_down = true;
525 net_socket_rs_init(&s->rs, net_socket_rs_finalize);
527 qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
531 static int net_socket_connect_init(NetClientState *peer,
534 const char *host_str)
537 int fd, connected, ret;
538 struct sockaddr_in saddr;
540 if (parse_host_port(&saddr, host_str) < 0)
543 fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
548 qemu_set_nonblock(fd);
552 ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
554 if (errno == EINTR || errno == EWOULDBLOCK) {
556 } else if (errno == EINPROGRESS ||
570 s = net_socket_fd_init(peer, model, name, fd, connected);
573 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
574 "socket: connect to %s:%d",
575 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
579 static int net_socket_mcast_init(NetClientState *peer,
582 const char *host_str,
583 const char *localaddr_str)
587 struct sockaddr_in saddr;
588 struct in_addr localaddr, *param_localaddr;
590 if (parse_host_port(&saddr, host_str) < 0)
593 if (localaddr_str != NULL) {
594 if (inet_aton(localaddr_str, &localaddr) == 0)
596 param_localaddr = &localaddr;
598 param_localaddr = NULL;
601 fd = net_socket_mcast_create(&saddr, param_localaddr);
605 s = net_socket_fd_init(peer, model, name, fd, 0);
609 s->dgram_dst = saddr;
611 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
612 "socket: mcast=%s:%d",
613 inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
618 static int net_socket_udp_init(NetClientState *peer,
626 struct sockaddr_in laddr, raddr;
628 if (parse_host_port(&laddr, lhost) < 0) {
632 if (parse_host_port(&raddr, rhost) < 0) {
636 fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
638 perror("socket(PF_INET, SOCK_DGRAM)");
642 ret = socket_set_fast_reuse(fd);
647 ret = bind(fd, (struct sockaddr *)&laddr, sizeof(laddr));
653 qemu_set_nonblock(fd);
655 s = net_socket_fd_init(peer, model, name, fd, 0);
660 s->dgram_dst = raddr;
662 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
664 inet_ntoa(raddr.sin_addr), ntohs(raddr.sin_port));
668 int net_init_socket(const Netdev *netdev, const char *name,
669 NetClientState *peer, Error **errp)
671 /* FIXME error_setg(errp, ...) on failure */
673 const NetdevSocketOptions *sock;
675 assert(netdev->type == NET_CLIENT_DRIVER_SOCKET);
676 sock = &netdev->u.socket;
678 if (sock->has_fd + sock->has_listen + sock->has_connect + sock->has_mcast +
679 sock->has_udp != 1) {
680 error_report("exactly one of fd=, listen=, connect=, mcast= or udp="
685 if (sock->has_localaddr && !sock->has_mcast && !sock->has_udp) {
686 error_report("localaddr= is only valid with mcast= or udp=");
693 fd = monitor_fd_param(cur_mon, sock->fd, &err);
695 error_report_err(err);
698 qemu_set_nonblock(fd);
699 if (!net_socket_fd_init(peer, "socket", name, fd, 1)) {
705 if (sock->has_listen) {
706 if (net_socket_listen_init(peer, "socket", name, sock->listen) == -1) {
712 if (sock->has_connect) {
713 if (net_socket_connect_init(peer, "socket", name, sock->connect) ==
720 if (sock->has_mcast) {
721 /* if sock->localaddr is missing, it has been initialized to "all bits
723 if (net_socket_mcast_init(peer, "socket", name, sock->mcast,
724 sock->localaddr) == -1) {
730 assert(sock->has_udp);
731 if (!sock->has_localaddr) {
732 error_report("localaddr= is mandatory with udp=");
735 if (net_socket_udp_init(peer, "socket", name, sock->udp, sock->localaddr) ==