[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 "qemu-error.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 nc;
    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->nc);
}

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 *nc, const struct iovec *iov,
                               int iovcnt)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);
    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 *nc, const uint8_t *buf, size_t size)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);
    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 *nc, const uint8_t *buf, size_t size)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);
    struct iovec iov[1];

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

#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 *nc, ssize_t len)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);
    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->nc, buf, size, tap_send_completed);
        if (size == 0) {
            tap_read_poll(s, 0);
        }
    } while (size > 0 && qemu_can_send_packet(&s->nc));
}

int tap_has_ufo(VLANClientState *nc)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);

    assert(nc->info->type == NET_CLIENT_TYPE_TAP);

    return s->has_ufo;
}

int tap_has_vnet_hdr(VLANClientState *nc)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);

    assert(nc->info->type == NET_CLIENT_TYPE_TAP);

    return s->has_vnet_hdr;
}

void tap_using_vnet_hdr(VLANClientState *nc, int using_vnet_hdr)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);

    using_vnet_hdr = using_vnet_hdr != 0;

    assert(nc->info->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 *nc, int csum, int tso4,
                     int tso6, int ecn, int ufo)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);

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

static void tap_cleanup(VLANClientState *nc)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);

    qemu_purge_queued_packets(nc);

    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);
}

static void tap_poll(VLANClientState *nc, bool enable)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);
    tap_read_poll(s, enable);
    tap_write_poll(s, enable);
}

/* fd support */

static NetClientInfo net_tap_info = {
    .type = NET_CLIENT_TYPE_TAP,
    .size = sizeof(TAPState),
    .receive = tap_receive,
    .receive_raw = tap_receive_raw,
    .receive_iov = tap_receive_iov,
    .poll = tap_poll,
    .cleanup = tap_cleanup,
};

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

    nc = qemu_new_net_client(&net_tap_info, vlan, NULL, model, name);

    s = DO_UPCAST(TAPState, nc, nc);

    s->fd = fd;
    s->has_vnet_hdr = vnet_hdr != 0;
    s->using_vnet_hdr = 0;
    s->has_ufo = tap_probe_has_ufo(s->fd);
    tap_set_offload(&s->nc, 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 = 0;

    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")) {
            error_report("ifname=, script=, downscript= and vnet_hdr= is invalid with fd=");
            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);
        if (fd == -1) {
            return -1;
        }
    }

    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->nc.info_str, sizeof(s->nc.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->nc.info_str, sizeof(s->nc.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);
        }
    }

    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"
2f792016	41	#include "qemu-error.h"
5281d757	42
5281d757	43	#include "net/tap-linux.h"
5281d757	44
5281d757 MM	45	/* Maximum GSO packet size (64k) plus plenty of room for
	46	* the ethernet and virtio_net headers
	47	*/
	48	#define TAP_BUFSIZE (4096 + 65536)
	49
	50	typedef struct TAPState {
3e35ba93	51	VLANClientState nc;
5281d757 MM	52	int fd;
	53	char down_script[1024];
	54	char down_script_arg[128];
	55	uint8_t buf[TAP_BUFSIZE];
	56	unsigned int read_poll : 1;
	57	unsigned int write_poll : 1;
	58	unsigned int has_vnet_hdr : 1;
	59	unsigned int using_vnet_hdr : 1;
	60	unsigned int has_ufo: 1;
	61	} TAPState;
	62
	63	static int launch_script(const char setup_script, const char ifname, int fd);
	64
	65	static int tap_can_send(void *opaque);
	66	static void tap_send(void *opaque);
	67	static void tap_writable(void *opaque);
	68
	69	static void tap_update_fd_handler(TAPState *s)
	70	{
	71	qemu_set_fd_handler2(s->fd,
	72	s->read_poll ? tap_can_send : NULL,
	73	s->read_poll ? tap_send : NULL,
	74	s->write_poll ? tap_writable : NULL,
	75	s);
	76	}
	77
	78	static void tap_read_poll(TAPState *s, int enable)
	79	{
	80	s->read_poll = !!enable;
	81	tap_update_fd_handler(s);
	82	}
	83
	84	static void tap_write_poll(TAPState *s, int enable)
	85	{
	86	s->write_poll = !!enable;
	87	tap_update_fd_handler(s);
	88	}
	89
	90	static void tap_writable(void *opaque)
	91	{
	92	TAPState *s = opaque;
	93
	94	tap_write_poll(s, 0);
	95
3e35ba93	96	qemu_flush_queued_packets(&s->nc);
5281d757 MM	97	}
	98
	99	static ssize_t tap_write_packet(TAPState s, const struct iovec iov, int iovcnt)
	100	{
	101	ssize_t len;
	102
	103	do {
	104	len = writev(s->fd, iov, iovcnt);
	105	} while (len == -1 && errno == EINTR);
	106
	107	if (len == -1 && errno == EAGAIN) {
	108	tap_write_poll(s, 1);
	109	return 0;
	110	}
	111
	112	return len;
	113	}
	114
3e35ba93	115	static ssize_t tap_receive_iov(VLANClientState nc, const struct iovec iov,
5281d757 MM	116	int iovcnt)
5281d757 MM	117	{
3e35ba93	118	TAPState *s = DO_UPCAST(TAPState, nc, nc);
5281d757 MM	119	const struct iovec *iovp = iov;
	120	struct iovec iov_copy[iovcnt + 1];
	121	struct virtio_net_hdr hdr = { 0, };
	122
	123	if (s->has_vnet_hdr && !s->using_vnet_hdr) {
	124	iov_copy[0].iov_base = &hdr;
	125	iov_copy[0].iov_len = sizeof(hdr);
	126	memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov));
	127	iovp = iov_copy;
	128	iovcnt++;
	129	}
	130
	131	return tap_write_packet(s, iovp, iovcnt);
	132	}
	133
3e35ba93	134	static ssize_t tap_receive_raw(VLANClientState nc, const uint8_t buf, size_t size)
5281d757	135	{
3e35ba93	136	TAPState *s = DO_UPCAST(TAPState, nc, nc);
5281d757 MM	137	struct iovec iov[2];
	138	int iovcnt = 0;
	139	struct virtio_net_hdr hdr = { 0, };
	140
	141	if (s->has_vnet_hdr) {
	142	iov[iovcnt].iov_base = &hdr;
	143	iov[iovcnt].iov_len = sizeof(hdr);
	144	iovcnt++;
	145	}
	146
	147	iov[iovcnt].iov_base = (char *)buf;
	148	iov[iovcnt].iov_len = size;
	149	iovcnt++;
	150
	151	return tap_write_packet(s, iov, iovcnt);
	152	}
	153
3e35ba93	154	static ssize_t tap_receive(VLANClientState nc, const uint8_t buf, size_t size)
5281d757	155	{
3e35ba93	156	TAPState *s = DO_UPCAST(TAPState, nc, nc);
5281d757 MM	157	struct iovec iov[1];
	158
	159	if (s->has_vnet_hdr && !s->using_vnet_hdr) {
3e35ba93	160	return tap_receive_raw(nc, buf, size);
5281d757 MM	161	}
	162
	163	iov[0].iov_base = (char *)buf;
	164	iov[0].iov_len = size;
	165
	166	return tap_write_packet(s, iov, 1);
	167	}
	168
	169	static int tap_can_send(void *opaque)
	170	{
	171	TAPState *s = opaque;
	172
3e35ba93	173	return qemu_can_send_packet(&s->nc);
5281d757 MM	174	}
5281d757 MM	175
966ea5ec MM	176	#ifndef __sun__
966ea5ec MM	177	ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
5281d757 MM	178	{
	179	return read(tapfd, buf, maxlen);
	180	}
	181	#endif
	182
3e35ba93	183	static void tap_send_completed(VLANClientState *nc, ssize_t len)
5281d757	184	{
3e35ba93	185	TAPState *s = DO_UPCAST(TAPState, nc, nc);
5281d757 MM	186	tap_read_poll(s, 1);
	187	}
	188
	189	static void tap_send(void *opaque)
	190	{
	191	TAPState *s = opaque;
	192	int size;
	193
5819c918 MM	194	do {
	195	uint8_t *buf = s->buf;
	196
	197	size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
	198	if (size <= 0) {
	199	break;
	200	}
	201
	202	if (s->has_vnet_hdr && !s->using_vnet_hdr) {
	203	buf += sizeof(struct virtio_net_hdr);
	204	size -= sizeof(struct virtio_net_hdr);
	205	}
	206
3e35ba93	207	size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
5819c918 MM	208	if (size == 0) {
	209	tap_read_poll(s, 0);
	210	}
3e35ba93	211	} while (size > 0 && qemu_can_send_packet(&s->nc));
5281d757 MM	212	}
5281d757 MM	213
3e35ba93	214	int tap_has_ufo(VLANClientState *nc)
5281d757	215	{
3e35ba93	216	TAPState *s = DO_UPCAST(TAPState, nc, nc);
5281d757	217
665a3b07	218	assert(nc->info->type == NET_CLIENT_TYPE_TAP);
5281d757 MM	219
	220	return s->has_ufo;
	221	}
	222
3e35ba93	223	int tap_has_vnet_hdr(VLANClientState *nc)
5281d757	224	{
3e35ba93	225	TAPState *s = DO_UPCAST(TAPState, nc, nc);
5281d757	226
665a3b07	227	assert(nc->info->type == NET_CLIENT_TYPE_TAP);
5281d757 MM	228
	229	return s->has_vnet_hdr;
	230	}
	231
3e35ba93	232	void tap_using_vnet_hdr(VLANClientState *nc, int using_vnet_hdr)
5281d757	233	{
3e35ba93	234	TAPState *s = DO_UPCAST(TAPState, nc, nc);
5281d757 MM	235
	236	using_vnet_hdr = using_vnet_hdr != 0;
	237
665a3b07	238	assert(nc->info->type == NET_CLIENT_TYPE_TAP);
5281d757 MM	239	assert(s->has_vnet_hdr == using_vnet_hdr);
	240
	241	s->using_vnet_hdr = using_vnet_hdr;
	242	}
	243
3e35ba93	244	void tap_set_offload(VLANClientState *nc, int csum, int tso4,
5281d757 MM	245	int tso6, int ecn, int ufo)
5281d757 MM	246	{
3e35ba93	247	TAPState *s = DO_UPCAST(TAPState, nc, nc);
5281d757	248
1faac1f7	249	return tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
5281d757 MM	250	}
5281d757 MM	251
3e35ba93	252	static void tap_cleanup(VLANClientState *nc)
5281d757	253	{
3e35ba93	254	TAPState *s = DO_UPCAST(TAPState, nc, nc);
5281d757	255
3e35ba93	256	qemu_purge_queued_packets(nc);
5281d757 MM	257
	258	if (s->down_script[0])
	259	launch_script(s->down_script, s->down_script_arg, s->fd);
	260
	261	tap_read_poll(s, 0);
	262	tap_write_poll(s, 0);
	263	close(s->fd);
5281d757 MM	264	}
5281d757 MM	265
ceb69615 MT	266	static void tap_poll(VLANClientState *nc, bool enable)
	267	{
	268	TAPState *s = DO_UPCAST(TAPState, nc, nc);
	269	tap_read_poll(s, enable);
	270	tap_write_poll(s, enable);
	271	}
	272
5281d757 MM	273	/* fd support */
5281d757 MM	274
3e35ba93 MM	275	static NetClientInfo net_tap_info = {
	276	.type = NET_CLIENT_TYPE_TAP,
	277	.size = sizeof(TAPState),
	278	.receive = tap_receive,
	279	.receive_raw = tap_receive_raw,
	280	.receive_iov = tap_receive_iov,
ceb69615	281	.poll = tap_poll,
3e35ba93 MM	282	.cleanup = tap_cleanup,
	283	};
	284
5281d757 MM	285	static TAPState net_tap_fd_init(VLANState vlan,
	286	const char *model,
	287	const char *name,
	288	int fd,
	289	int vnet_hdr)
	290	{
3e35ba93	291	VLANClientState *nc;
5281d757	292	TAPState *s;
5281d757	293
3e35ba93 MM	294	nc = qemu_new_net_client(&net_tap_info, vlan, NULL, model, name);
	295
	296	s = DO_UPCAST(TAPState, nc, nc);
	297
5281d757 MM	298	s->fd = fd;
	299	s->has_vnet_hdr = vnet_hdr != 0;
	300	s->using_vnet_hdr = 0;
9c282718	301	s->has_ufo = tap_probe_has_ufo(s->fd);
3e35ba93	302	tap_set_offload(&s->nc, 0, 0, 0, 0, 0);
5281d757 MM	303	tap_read_poll(s, 1);
	304	return s;
	305	}
	306
5281d757 MM	307	static int launch_script(const char setup_script, const char ifname, int fd)
	308	{
	309	sigset_t oldmask, mask;
	310	int pid, status;
	311	char *args[3];
	312	char **parg;
	313
	314	sigemptyset(&mask);
	315	sigaddset(&mask, SIGCHLD);
	316	sigprocmask(SIG_BLOCK, &mask, &oldmask);
	317
	318	/* try to launch network script */
	319	pid = fork();
	320	if (pid == 0) {
	321	int open_max = sysconf(_SC_OPEN_MAX), i;
	322
	323	for (i = 0; i < open_max; i++) {
	324	if (i != STDIN_FILENO &&
	325	i != STDOUT_FILENO &&
	326	i != STDERR_FILENO &&
	327	i != fd) {
	328	close(i);
	329	}
	330	}
	331	parg = args;
	332	parg++ = (char )setup_script;
	333	parg++ = (char )ifname;
	334	*parg++ = NULL;
	335	execv(setup_script, args);
	336	_exit(1);
	337	} else if (pid > 0) {
	338	while (waitpid(pid, &status, 0) != pid) {
	339	/* loop */
	340	}
	341	sigprocmask(SIG_SETMASK, &oldmask, NULL);
	342
	343	if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
	344	return 0;
	345	}
	346	}
	347	fprintf(stderr, "%s: could not launch network script\n", setup_script);
	348	return -1;
	349	}
	350
	351	static int net_tap_init(QemuOpts opts, int vnet_hdr)
	352	{
	353	int fd, vnet_hdr_required;
	354	char ifname[128] = {0,};
	355	const char *setup_script;
	356
	357	if (qemu_opt_get(opts, "ifname")) {
	358	pstrcpy(ifname, sizeof(ifname), qemu_opt_get(opts, "ifname"));
	359	}
	360
	361	*vnet_hdr = qemu_opt_get_bool(opts, "vnet_hdr", 1);
	362	if (qemu_opt_get(opts, "vnet_hdr")) {
	363	vnet_hdr_required = *vnet_hdr;
	364	} else {
	365	vnet_hdr_required = 0;
	366	}
	367
	368	TFR(fd = tap_open(ifname, sizeof(ifname), vnet_hdr, vnet_hdr_required));
	369	if (fd < 0) {
	370	return -1;
371	}
372
373	setup_script = qemu_opt_get(opts, "script");
374	if (setup_script &&
375	setup_script[0] != '\0' &&
376	strcmp(setup_script, "no") != 0 &&
377	launch_script(setup_script, ifname, fd)) {
378	close(fd);
379	return -1;
380	}
381
382	qemu_opt_set(opts, "ifname", ifname);
383
384	return fd;
385	}
386
387	int net_init_tap(QemuOpts opts, Monitor mon, const char name, VLANState vlan)
388	{
389	TAPState *s;
df6c2a0f	390	int fd, vnet_hdr = 0;
5281d757 MM	391
	392	if (qemu_opt_get(opts, "fd")) {
	393	if (qemu_opt_get(opts, "ifname") \|\|
	394	qemu_opt_get(opts, "script") \|\|
	395	qemu_opt_get(opts, "downscript") \|\|
	396	qemu_opt_get(opts, "vnet_hdr")) {
1ecda02b	397	error_report("ifname=, script=, downscript= and vnet_hdr= is invalid with fd=");
5281d757 MM	398	return -1;
	399	}
	400
	401	fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd"));
	402	if (fd == -1) {
	403	return -1;
	404	}
	405
	406	fcntl(fd, F_SETFL, O_NONBLOCK);
	407
	408	vnet_hdr = tap_probe_vnet_hdr(fd);
	409	} else {
	410	if (!qemu_opt_get(opts, "script")) {
	411	qemu_opt_set(opts, "script", DEFAULT_NETWORK_SCRIPT);
	412	}
	413
	414	if (!qemu_opt_get(opts, "downscript")) {
	415	qemu_opt_set(opts, "downscript", DEFAULT_NETWORK_DOWN_SCRIPT);
	416	}
	417
	418	fd = net_tap_init(opts, &vnet_hdr);
929fe497 JL	419	if (fd == -1) {
	420	return -1;
	421	}
5281d757 MM	422	}
	423
	424	s = net_tap_fd_init(vlan, "tap", name, fd, vnet_hdr);
	425	if (!s) {
	426	close(fd);
	427	return -1;
	428	}
	429
15ac913b	430	if (tap_set_sndbuf(s->fd, opts) < 0) {
5281d757 MM	431	return -1;
	432	}
	433
	434	if (qemu_opt_get(opts, "fd")) {
3e35ba93	435	snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd);
5281d757 MM	436	} else {
	437	const char ifname, script, *downscript;
	438
	439	ifname = qemu_opt_get(opts, "ifname");
	440	script = qemu_opt_get(opts, "script");
	441	downscript = qemu_opt_get(opts, "downscript");
	442
3e35ba93	443	snprintf(s->nc.info_str, sizeof(s->nc.info_str),
5281d757 MM	444	"ifname=%s,script=%s,downscript=%s",
	445	ifname, script, downscript);
	446
	447	if (strcmp(downscript, "no") != 0) {
	448	snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
	449	snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname);
	450	}
	451	}
	452
5281d757 MM	453	return 0;
5281d757 MM	454	}