[qemu.git] / net / tap.c

/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 * Copyright (c) 2009 Red Hat, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "net/tap.h"

#include "config-host.h"

#include <signal.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <net/if.h>

#include "net.h"
#include "sysemu.h"
#include "qemu-char.h"
#include "qemu-common.h"

#include "net/tap-linux.h"

/* Maximum GSO packet size (64k) plus plenty of room for
 * the ethernet and virtio_net headers
 */
#define TAP_BUFSIZE (4096 + 65536)

typedef struct TAPState {
    VLANClientState *vc;
    int fd;
    char down_script[1024];
    char down_script_arg[128];
    uint8_t buf[TAP_BUFSIZE];
    unsigned int read_poll : 1;
    unsigned int write_poll : 1;
    unsigned int has_vnet_hdr : 1;
    unsigned int using_vnet_hdr : 1;
    unsigned int has_ufo: 1;
} TAPState;

static int launch_script(const char *setup_script, const char *ifname, int fd);

static int tap_can_send(void *opaque);
static void tap_send(void *opaque);
static void tap_writable(void *opaque);

static void tap_update_fd_handler(TAPState *s)
{
    qemu_set_fd_handler2(s->fd,
                         s->read_poll  ? tap_can_send : NULL,
                         s->read_poll  ? tap_send     : NULL,
                         s->write_poll ? tap_writable : NULL,
                         s);
}

static void tap_read_poll(TAPState *s, int enable)
{
    s->read_poll = !!enable;
    tap_update_fd_handler(s);
}

static void tap_write_poll(TAPState *s, int enable)
{
    s->write_poll = !!enable;
    tap_update_fd_handler(s);
}

static void tap_writable(void *opaque)
{
    TAPState *s = opaque;

    tap_write_poll(s, 0);

    qemu_flush_queued_packets(s->vc);
}

static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt)
{
    ssize_t len;

    do {
        len = writev(s->fd, iov, iovcnt);
    } while (len == -1 && errno == EINTR);

    if (len == -1 && errno == EAGAIN) {
        tap_write_poll(s, 1);
        return 0;
    }

    return len;
}

static ssize_t tap_receive_iov(VLANClientState *vc, const struct iovec *iov,
                               int iovcnt)
{
    TAPState *s = vc->opaque;
    const struct iovec *iovp = iov;
    struct iovec iov_copy[iovcnt + 1];
    struct virtio_net_hdr hdr = { 0, };

    if (s->has_vnet_hdr && !s->using_vnet_hdr) {
        iov_copy[0].iov_base = &hdr;
        iov_copy[0].iov_len =  sizeof(hdr);
        memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov));
        iovp = iov_copy;
        iovcnt++;
    }

    return tap_write_packet(s, iovp, iovcnt);
}

static ssize_t tap_receive_raw(VLANClientState *vc, const uint8_t *buf, size_t size)
{
    TAPState *s = vc->opaque;
    struct iovec iov[2];
    int iovcnt = 0;
    struct virtio_net_hdr hdr = { 0, };

    if (s->has_vnet_hdr) {
        iov[iovcnt].iov_base = &hdr;
        iov[iovcnt].iov_len  = sizeof(hdr);
        iovcnt++;
    }

    iov[iovcnt].iov_base = (char *)buf;
    iov[iovcnt].iov_len  = size;
    iovcnt++;

    return tap_write_packet(s, iov, iovcnt);
}

static ssize_t tap_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
{
    TAPState *s = vc->opaque;
    struct iovec iov[1];

    if (s->has_vnet_hdr && !s->using_vnet_hdr) {
        return tap_receive_raw(vc, buf, size);
    }

    iov[0].iov_base = (char *)buf;
    iov[0].iov_len  = size;

    return tap_write_packet(s, iov, 1);
}

static int tap_can_send(void *opaque)
{
    TAPState *s = opaque;

    return qemu_can_send_packet(s->vc);
}

#ifndef __sun__
ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
{
    return read(tapfd, buf, maxlen);
}
#endif

static void tap_send_completed(VLANClientState *vc, ssize_t len)
{
    TAPState *s = vc->opaque;
    tap_read_poll(s, 1);
}

static void tap_send(void *opaque)
{
    TAPState *s = opaque;
    int size;

    do {
        uint8_t *buf = s->buf;

        size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
        if (size <= 0) {
            break;
        }

        if (s->has_vnet_hdr && !s->using_vnet_hdr) {
            buf  += sizeof(struct virtio_net_hdr);
            size -= sizeof(struct virtio_net_hdr);
        }

        size = qemu_send_packet_async(s->vc, buf, size, tap_send_completed);
        if (size == 0) {
            tap_read_poll(s, 0);
        }
    } while (size > 0 && qemu_can_send_packet(s->vc));
}

int tap_has_ufo(VLANClientState *vc)
{
    TAPState *s = vc->opaque;

    assert(vc->type == NET_CLIENT_TYPE_TAP);

    return s->has_ufo;
}

int tap_has_vnet_hdr(VLANClientState *vc)
{
    TAPState *s = vc->opaque;

    assert(vc->type == NET_CLIENT_TYPE_TAP);

    return s->has_vnet_hdr;
}

void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr)
{
    TAPState *s = vc->opaque;

    using_vnet_hdr = using_vnet_hdr != 0;

    assert(vc->type == NET_CLIENT_TYPE_TAP);
    assert(s->has_vnet_hdr == using_vnet_hdr);

    s->using_vnet_hdr = using_vnet_hdr;
}

void tap_set_offload(VLANClientState *vc, int csum, int tso4,
                     int tso6, int ecn, int ufo)
{
    TAPState *s = vc->opaque;

    return tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
}

static void tap_cleanup(VLANClientState *vc)
{
    TAPState *s = vc->opaque;

    qemu_purge_queued_packets(vc);

    if (s->down_script[0])
        launch_script(s->down_script, s->down_script_arg, s->fd);

    tap_read_poll(s, 0);
    tap_write_poll(s, 0);
    close(s->fd);
    qemu_free(s);
}

/* fd support */

static TAPState *net_tap_fd_init(VLANState *vlan,
                                 const char *model,
                                 const char *name,
                                 int fd,
                                 int vnet_hdr)
{
    TAPState *s;

    s = qemu_mallocz(sizeof(TAPState));
    s->fd = fd;
    s->has_vnet_hdr = vnet_hdr != 0;
    s->using_vnet_hdr = 0;
    s->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_TAP,
                                 vlan, NULL, model, name, NULL,
                                 tap_receive, tap_receive_raw,
                                 tap_receive_iov, tap_cleanup, s);
    s->has_ufo = tap_probe_has_ufo(s->fd);
    tap_set_offload(s->vc, 0, 0, 0, 0, 0);
    tap_read_poll(s, 1);
    return s;
}

static int launch_script(const char *setup_script, const char *ifname, int fd)
{
    sigset_t oldmask, mask;
    int pid, status;
    char *args[3];
    char **parg;

    sigemptyset(&mask);
    sigaddset(&mask, SIGCHLD);
    sigprocmask(SIG_BLOCK, &mask, &oldmask);

    /* try to launch network script */
    pid = fork();
    if (pid == 0) {
        int open_max = sysconf(_SC_OPEN_MAX), i;

        for (i = 0; i < open_max; i++) {
            if (i != STDIN_FILENO &&
                i != STDOUT_FILENO &&
                i != STDERR_FILENO &&
                i != fd) {
                close(i);
            }
        }
        parg = args;
        *parg++ = (char *)setup_script;
        *parg++ = (char *)ifname;
        *parg++ = NULL;
        execv(setup_script, args);
        _exit(1);
    } else if (pid > 0) {
        while (waitpid(pid, &status, 0) != pid) {
            /* loop */
        }
        sigprocmask(SIG_SETMASK, &oldmask, NULL);

        if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
            return 0;
        }
    }
    fprintf(stderr, "%s: could not launch network script\n", setup_script);
    return -1;
}

static int net_tap_init(QemuOpts *opts, int *vnet_hdr)
{
    int fd, vnet_hdr_required;
    char ifname[128] = {0,};
    const char *setup_script;

    if (qemu_opt_get(opts, "ifname")) {
        pstrcpy(ifname, sizeof(ifname), qemu_opt_get(opts, "ifname"));
    }

    *vnet_hdr = qemu_opt_get_bool(opts, "vnet_hdr", 1);
    if (qemu_opt_get(opts, "vnet_hdr")) {
        vnet_hdr_required = *vnet_hdr;
    } else {
        vnet_hdr_required = 0;
    }

    TFR(fd = tap_open(ifname, sizeof(ifname), vnet_hdr, vnet_hdr_required));
    if (fd < 0) {
        return -1;
    }

    setup_script = qemu_opt_get(opts, "script");
    if (setup_script &&
        setup_script[0] != '\0' &&
        strcmp(setup_script, "no") != 0 &&
        launch_script(setup_script, ifname, fd)) {
        close(fd);
        return -1;
    }

    qemu_opt_set(opts, "ifname", ifname);

    return fd;
}

int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan)
{
    TAPState *s;
    int fd, vnet_hdr;

    if (qemu_opt_get(opts, "fd")) {
        if (qemu_opt_get(opts, "ifname") ||
            qemu_opt_get(opts, "script") ||
            qemu_opt_get(opts, "downscript") ||
            qemu_opt_get(opts, "vnet_hdr")) {
            qemu_error("ifname=, script=, downscript= and vnet_hdr= is invalid with fd=\n");
            return -1;
        }

        fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd"));
        if (fd == -1) {
            return -1;
        }

        fcntl(fd, F_SETFL, O_NONBLOCK);

        vnet_hdr = tap_probe_vnet_hdr(fd);
    } else {
        if (!qemu_opt_get(opts, "script")) {
            qemu_opt_set(opts, "script", DEFAULT_NETWORK_SCRIPT);
        }

        if (!qemu_opt_get(opts, "downscript")) {
            qemu_opt_set(opts, "downscript", DEFAULT_NETWORK_DOWN_SCRIPT);
        }

        fd = net_tap_init(opts, &vnet_hdr);
    }

    s = net_tap_fd_init(vlan, "tap", name, fd, vnet_hdr);
    if (!s) {
        close(fd);
        return -1;
    }

    if (tap_set_sndbuf(s->fd, opts) < 0) {
        return -1;
    }

    if (qemu_opt_get(opts, "fd")) {
        snprintf(s->vc->info_str, sizeof(s->vc->info_str), "fd=%d", fd);
    } else {
        const char *ifname, *script, *downscript;

        ifname     = qemu_opt_get(opts, "ifname");
        script     = qemu_opt_get(opts, "script");
        downscript = qemu_opt_get(opts, "downscript");

        snprintf(s->vc->info_str, sizeof(s->vc->info_str),
                 "ifname=%s,script=%s,downscript=%s",
                 ifname, script, downscript);

        if (strcmp(downscript, "no") != 0) {
            snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
            snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname);
        }
    }

    if (vlan) {
        vlan->nb_host_devs++;
    }

    return 0;
}
Commit	Line	Data
5281d757 MM	1	/*
	2	* QEMU System Emulator
	3	*
	4	* Copyright (c) 2003-2008 Fabrice Bellard
	5	* Copyright (c) 2009 Red Hat, Inc.
	6	*
	7	* Permission is hereby granted, free of charge, to any person obtaining a copy
	8	* of this software and associated documentation files (the "Software"), to deal
	9	* in the Software without restriction, including without limitation the rights
	10	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	11	* copies of the Software, and to permit persons to whom the Software is
	12	* furnished to do so, subject to the following conditions:
	13	*
	14	* The above copyright notice and this permission notice shall be included in
	15	* all copies or substantial portions of the Software.
	16	*
	17	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	18	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	19	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	20	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	21	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	22	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	23	* THE SOFTWARE.
	24	*/
	25
	26	#include "net/tap.h"
	27
	28	#include "config-host.h"
	29
	30	#include <signal.h>
	31	#include <sys/ioctl.h>
	32	#include <sys/stat.h>
	33	#include <sys/wait.h>
71f4effc	34	#include <sys/socket.h>
5281d757 MM	35	#include <net/if.h>
	36
	37	#include "net.h"
	38	#include "sysemu.h"
	39	#include "qemu-char.h"
	40	#include "qemu-common.h"
	41
5281d757	42	#include "net/tap-linux.h"
5281d757	43
5281d757 MM	44	/* Maximum GSO packet size (64k) plus plenty of room for
	45	* the ethernet and virtio_net headers
	46	*/
	47	#define TAP_BUFSIZE (4096 + 65536)
	48
	49	typedef struct TAPState {
	50	VLANClientState *vc;
	51	int fd;
	52	char down_script[1024];
	53	char down_script_arg[128];
	54	uint8_t buf[TAP_BUFSIZE];
	55	unsigned int read_poll : 1;
	56	unsigned int write_poll : 1;
	57	unsigned int has_vnet_hdr : 1;
	58	unsigned int using_vnet_hdr : 1;
	59	unsigned int has_ufo: 1;
	60	} TAPState;
	61
	62	static int launch_script(const char setup_script, const char ifname, int fd);
	63
	64	static int tap_can_send(void *opaque);
	65	static void tap_send(void *opaque);
	66	static void tap_writable(void *opaque);
	67
	68	static void tap_update_fd_handler(TAPState *s)
	69	{
	70	qemu_set_fd_handler2(s->fd,
	71	s->read_poll ? tap_can_send : NULL,
	72	s->read_poll ? tap_send : NULL,
	73	s->write_poll ? tap_writable : NULL,
	74	s);
	75	}
	76
	77	static void tap_read_poll(TAPState *s, int enable)
	78	{
	79	s->read_poll = !!enable;
	80	tap_update_fd_handler(s);
	81	}
	82
	83	static void tap_write_poll(TAPState *s, int enable)
	84	{
	85	s->write_poll = !!enable;
	86	tap_update_fd_handler(s);
	87	}
	88
	89	static void tap_writable(void *opaque)
	90	{
	91	TAPState *s = opaque;
	92
	93	tap_write_poll(s, 0);
	94
	95	qemu_flush_queued_packets(s->vc);
	96	}
	97
	98	static ssize_t tap_write_packet(TAPState s, const struct iovec iov, int iovcnt)
	99	{
	100	ssize_t len;
	101
	102	do {
	103	len = writev(s->fd, iov, iovcnt);
	104	} while (len == -1 && errno == EINTR);
	105
	106	if (len == -1 && errno == EAGAIN) {
	107	tap_write_poll(s, 1);
108	return 0;
109	}
110
111	return len;
112	}
113
114	static ssize_t tap_receive_iov(VLANClientState vc, const struct iovec iov,
115	int iovcnt)
116	{
117	TAPState *s = vc->opaque;
118	const struct iovec *iovp = iov;
119	struct iovec iov_copy[iovcnt + 1];
120	struct virtio_net_hdr hdr = { 0, };
121
122	if (s->has_vnet_hdr && !s->using_vnet_hdr) {
123	iov_copy[0].iov_base = &hdr;
124	iov_copy[0].iov_len = sizeof(hdr);
125	memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov));
126	iovp = iov_copy;
127	iovcnt++;
128	}
129
130	return tap_write_packet(s, iovp, iovcnt);
131	}
132
133	static ssize_t tap_receive_raw(VLANClientState vc, const uint8_t buf, size_t size)
134	{
135	TAPState *s = vc->opaque;
136	struct iovec iov[2];
137	int iovcnt = 0;
138	struct virtio_net_hdr hdr = { 0, };
139
140	if (s->has_vnet_hdr) {
141	iov[iovcnt].iov_base = &hdr;
142	iov[iovcnt].iov_len = sizeof(hdr);
143	iovcnt++;
144	}
145
146	iov[iovcnt].iov_base = (char *)buf;
147	iov[iovcnt].iov_len = size;
148	iovcnt++;
149
150	return tap_write_packet(s, iov, iovcnt);
151	}
152
153	static ssize_t tap_receive(VLANClientState vc, const uint8_t buf, size_t size)
154	{
155	TAPState *s = vc->opaque;
156	struct iovec iov[1];
157
158	if (s->has_vnet_hdr && !s->using_vnet_hdr) {
159	return tap_receive_raw(vc, buf, size);
160	}
161
162	iov[0].iov_base = (char *)buf;
163	iov[0].iov_len = size;
164
165	return tap_write_packet(s, iov, 1);
166	}
167
168	static int tap_can_send(void *opaque)
169	{
170	TAPState *s = opaque;
171
172	return qemu_can_send_packet(s->vc);
173	}
174
966ea5ec MM	175	#ifndef __sun__
966ea5ec MM	176	ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
5281d757 MM	177	{
	178	return read(tapfd, buf, maxlen);
	179	}
	180	#endif
	181
	182	static void tap_send_completed(VLANClientState *vc, ssize_t len)
	183	{
	184	TAPState *s = vc->opaque;
	185	tap_read_poll(s, 1);
	186	}
	187
	188	static void tap_send(void *opaque)
	189	{
	190	TAPState *s = opaque;
	191	int size;
	192
5819c918 MM	193	do {
	194	uint8_t *buf = s->buf;
	195
	196	size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
	197	if (size <= 0) {
	198	break;
	199	}
	200
	201	if (s->has_vnet_hdr && !s->using_vnet_hdr) {
	202	buf += sizeof(struct virtio_net_hdr);
	203	size -= sizeof(struct virtio_net_hdr);
	204	}
	205
	206	size = qemu_send_packet_async(s->vc, buf, size, tap_send_completed);
	207	if (size == 0) {
	208	tap_read_poll(s, 0);
	209	}
	210	} while (size > 0 && qemu_can_send_packet(s->vc));
5281d757 MM	211	}
5281d757 MM	212
5281d757 MM	213	int tap_has_ufo(VLANClientState *vc)
	214	{
	215	TAPState *s = vc->opaque;
	216
	217	assert(vc->type == NET_CLIENT_TYPE_TAP);
	218
	219	return s->has_ufo;
	220	}
	221
	222	int tap_has_vnet_hdr(VLANClientState *vc)
	223	{
	224	TAPState *s = vc->opaque;
	225
	226	assert(vc->type == NET_CLIENT_TYPE_TAP);
	227
	228	return s->has_vnet_hdr;
	229	}
	230
	231	void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr)
	232	{
	233	TAPState *s = vc->opaque;
	234
	235	using_vnet_hdr = using_vnet_hdr != 0;
	236
	237	assert(vc->type == NET_CLIENT_TYPE_TAP);
	238	assert(s->has_vnet_hdr == using_vnet_hdr);
	239
	240	s->using_vnet_hdr = using_vnet_hdr;
	241	}
	242
5281d757 MM	243	void tap_set_offload(VLANClientState *vc, int csum, int tso4,
	244	int tso6, int ecn, int ufo)
	245	{
	246	TAPState *s = vc->opaque;
5281d757	247
1faac1f7	248	return tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
5281d757 MM	249	}
	250
	251	static void tap_cleanup(VLANClientState *vc)
	252	{
	253	TAPState *s = vc->opaque;
	254
	255	qemu_purge_queued_packets(vc);
	256
	257	if (s->down_script[0])
	258	launch_script(s->down_script, s->down_script_arg, s->fd);
	259
	260	tap_read_poll(s, 0);
	261	tap_write_poll(s, 0);
	262	close(s->fd);
	263	qemu_free(s);
	264	}
	265
	266	/* fd support */
	267
	268	static TAPState net_tap_fd_init(VLANState vlan,
	269	const char *model,
	270	const char *name,
	271	int fd,
	272	int vnet_hdr)
	273	{
	274	TAPState *s;
5281d757 MM	275
	276	s = qemu_mallocz(sizeof(TAPState));
	277	s->fd = fd;
	278	s->has_vnet_hdr = vnet_hdr != 0;
	279	s->using_vnet_hdr = 0;
	280	s->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_TAP,
	281	vlan, NULL, model, name, NULL,
	282	tap_receive, tap_receive_raw,
	283	tap_receive_iov, tap_cleanup, s);
9c282718	284	s->has_ufo = tap_probe_has_ufo(s->fd);
5281d757 MM	285	tap_set_offload(s->vc, 0, 0, 0, 0, 0);
	286	tap_read_poll(s, 1);
	287	return s;
	288	}
	289
5281d757 MM	290	static int launch_script(const char setup_script, const char ifname, int fd)
	291	{
	292	sigset_t oldmask, mask;
	293	int pid, status;
	294	char *args[3];
	295	char **parg;
	296
	297	sigemptyset(&mask);
	298	sigaddset(&mask, SIGCHLD);
	299	sigprocmask(SIG_BLOCK, &mask, &oldmask);
	300
	301	/* try to launch network script */
	302	pid = fork();
	303	if (pid == 0) {
	304	int open_max = sysconf(_SC_OPEN_MAX), i;
	305
	306	for (i = 0; i < open_max; i++) {
	307	if (i != STDIN_FILENO &&
	308	i != STDOUT_FILENO &&
	309	i != STDERR_FILENO &&
	310	i != fd) {
	311	close(i);
	312	}
	313	}
	314	parg = args;
	315	parg++ = (char )setup_script;
	316	parg++ = (char )ifname;
	317	*parg++ = NULL;
	318	execv(setup_script, args);
	319	_exit(1);
	320	} else if (pid > 0) {
	321	while (waitpid(pid, &status, 0) != pid) {
	322	/* loop */
	323	}
	324	sigprocmask(SIG_SETMASK, &oldmask, NULL);
	325
	326	if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
	327	return 0;
	328	}
	329	}
	330	fprintf(stderr, "%s: could not launch network script\n", setup_script);
	331	return -1;
	332	}
	333
	334	static int net_tap_init(QemuOpts opts, int vnet_hdr)
	335	{
	336	int fd, vnet_hdr_required;
	337	char ifname[128] = {0,};
	338	const char *setup_script;
	339
	340	if (qemu_opt_get(opts, "ifname")) {
	341	pstrcpy(ifname, sizeof(ifname), qemu_opt_get(opts, "ifname"));
	342	}
	343
	344	*vnet_hdr = qemu_opt_get_bool(opts, "vnet_hdr", 1);
	345	if (qemu_opt_get(opts, "vnet_hdr")) {
	346	vnet_hdr_required = *vnet_hdr;
	347	} else {
	348	vnet_hdr_required = 0;
	349	}
	350
	351	TFR(fd = tap_open(ifname, sizeof(ifname), vnet_hdr, vnet_hdr_required));
	352	if (fd < 0) {
	353	return -1;
354	}
355
356	setup_script = qemu_opt_get(opts, "script");
357	if (setup_script &&
358	setup_script[0] != '\0' &&
359	strcmp(setup_script, "no") != 0 &&
360	launch_script(setup_script, ifname, fd)) {
361	close(fd);
362	return -1;
363	}
364
365	qemu_opt_set(opts, "ifname", ifname);
366
367	return fd;
368	}
369
370	int net_init_tap(QemuOpts opts, Monitor mon, const char name, VLANState vlan)
371	{
372	TAPState *s;
373	int fd, vnet_hdr;
374
375	if (qemu_opt_get(opts, "fd")) {
376	if (qemu_opt_get(opts, "ifname") \|\|
377	qemu_opt_get(opts, "script") \|\|
378	qemu_opt_get(opts, "downscript") \|\|
379	qemu_opt_get(opts, "vnet_hdr")) {
380	qemu_error("ifname=, script=, downscript= and vnet_hdr= is invalid with fd=\n");
381	return -1;
382	}
383
384	fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd"));
385	if (fd == -1) {
386	return -1;
387	}
388
389	fcntl(fd, F_SETFL, O_NONBLOCK);
390
391	vnet_hdr = tap_probe_vnet_hdr(fd);
392	} else {
393	if (!qemu_opt_get(opts, "script")) {
394	qemu_opt_set(opts, "script", DEFAULT_NETWORK_SCRIPT);
395	}
396
397	if (!qemu_opt_get(opts, "downscript")) {
398	qemu_opt_set(opts, "downscript", DEFAULT_NETWORK_DOWN_SCRIPT);
399	}
400
401	fd = net_tap_init(opts, &vnet_hdr);
402	}
403
404	s = net_tap_fd_init(vlan, "tap", name, fd, vnet_hdr);
405	if (!s) {
406	close(fd);
407	return -1;
408	}
409
15ac913b	410	if (tap_set_sndbuf(s->fd, opts) < 0) {
5281d757 MM	411	return -1;
	412	}
	413
	414	if (qemu_opt_get(opts, "fd")) {
	415	snprintf(s->vc->info_str, sizeof(s->vc->info_str), "fd=%d", fd);
	416	} else {
	417	const char ifname, script, *downscript;
	418
	419	ifname = qemu_opt_get(opts, "ifname");
	420	script = qemu_opt_get(opts, "script");
	421	downscript = qemu_opt_get(opts, "downscript");
	422
	423	snprintf(s->vc->info_str, sizeof(s->vc->info_str),
	424	"ifname=%s,script=%s,downscript=%s",
	425	ifname, script, downscript);
	426
	427	if (strcmp(downscript, "no") != 0) {
	428	snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
	429	snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname);
	430	}
	431	}
	432
	433	if (vlan) {
	434	vlan->nb_host_devs++;
	435	}
	436
	437	return 0;
	438	}