mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-10 13:06:08 +00:00
c87826a878
This patch forbid the following invalid parameters to tap: 1) fd and vhostfds were specified but vhostfd were not specified 2) vhostfds were specified but fds were not specified 3) fds and vhostfd were specified For 1 and 2, net_init_tap_one() will still pass NULL as vhostfdname to monitor_handle_fd_param(), which may crash the qemu. Also remove the unnecessary has_fd check. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Stefan Hajnoczi <shajnocz@redhat.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: qemu-stable@nongnu.org Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
871 lines
23 KiB
C
871 lines
23 KiB
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 "tap_int.h"
|
|
|
|
#include "config-host.h"
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/socket.h>
|
|
#include <net/if.h>
|
|
|
|
#include "net/net.h"
|
|
#include "clients.h"
|
|
#include "monitor/monitor.h"
|
|
#include "sysemu/sysemu.h"
|
|
#include "qemu-common.h"
|
|
#include "qemu/error-report.h"
|
|
|
|
#include "net/tap.h"
|
|
|
|
#include "net/vhost_net.h"
|
|
|
|
typedef struct TAPState {
|
|
NetClientState nc;
|
|
int fd;
|
|
char down_script[1024];
|
|
char down_script_arg[128];
|
|
uint8_t buf[NET_BUFSIZE];
|
|
bool read_poll;
|
|
bool write_poll;
|
|
bool using_vnet_hdr;
|
|
bool has_ufo;
|
|
bool enabled;
|
|
VHostNetState *vhost_net;
|
|
unsigned host_vnet_hdr_len;
|
|
} 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 && s->enabled ? tap_can_send : NULL,
|
|
s->read_poll && s->enabled ? tap_send : NULL,
|
|
s->write_poll && s->enabled ? tap_writable : NULL,
|
|
s);
|
|
}
|
|
|
|
static void tap_read_poll(TAPState *s, bool enable)
|
|
{
|
|
s->read_poll = enable;
|
|
tap_update_fd_handler(s);
|
|
}
|
|
|
|
static void tap_write_poll(TAPState *s, bool enable)
|
|
{
|
|
s->write_poll = enable;
|
|
tap_update_fd_handler(s);
|
|
}
|
|
|
|
static void tap_writable(void *opaque)
|
|
{
|
|
TAPState *s = opaque;
|
|
|
|
tap_write_poll(s, false);
|
|
|
|
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, true);
|
|
return 0;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t tap_receive_iov(NetClientState *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_mrg_rxbuf hdr = { };
|
|
|
|
if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
|
|
iov_copy[0].iov_base = &hdr;
|
|
iov_copy[0].iov_len = s->host_vnet_hdr_len;
|
|
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(NetClientState *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_mrg_rxbuf hdr = { };
|
|
|
|
if (s->host_vnet_hdr_len) {
|
|
iov[iovcnt].iov_base = &hdr;
|
|
iov[iovcnt].iov_len = s->host_vnet_hdr_len;
|
|
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(NetClientState *nc, const uint8_t *buf, size_t size)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
struct iovec iov[1];
|
|
|
|
if (s->host_vnet_hdr_len && !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(NetClientState *nc, ssize_t len)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
tap_read_poll(s, true);
|
|
}
|
|
|
|
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->host_vnet_hdr_len && !s->using_vnet_hdr) {
|
|
buf += s->host_vnet_hdr_len;
|
|
size -= s->host_vnet_hdr_len;
|
|
}
|
|
|
|
size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
|
|
if (size == 0) {
|
|
tap_read_poll(s, false);
|
|
}
|
|
} while (size > 0 && qemu_can_send_packet(&s->nc));
|
|
}
|
|
|
|
bool tap_has_ufo(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
|
|
assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP);
|
|
|
|
return s->has_ufo;
|
|
}
|
|
|
|
int tap_has_vnet_hdr(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
|
|
assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP);
|
|
|
|
return !!s->host_vnet_hdr_len;
|
|
}
|
|
|
|
int tap_has_vnet_hdr_len(NetClientState *nc, int len)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
|
|
assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP);
|
|
|
|
return tap_probe_vnet_hdr_len(s->fd, len);
|
|
}
|
|
|
|
void tap_set_vnet_hdr_len(NetClientState *nc, int len)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
|
|
assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP);
|
|
assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) ||
|
|
len == sizeof(struct virtio_net_hdr));
|
|
|
|
tap_fd_set_vnet_hdr_len(s->fd, len);
|
|
s->host_vnet_hdr_len = len;
|
|
}
|
|
|
|
void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
|
|
assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP);
|
|
assert(!!s->host_vnet_hdr_len == using_vnet_hdr);
|
|
|
|
s->using_vnet_hdr = using_vnet_hdr;
|
|
}
|
|
|
|
void tap_set_offload(NetClientState *nc, int csum, int tso4,
|
|
int tso6, int ecn, int ufo)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
if (s->fd < 0) {
|
|
return;
|
|
}
|
|
|
|
tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
|
|
}
|
|
|
|
static void tap_cleanup(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
|
|
if (s->vhost_net) {
|
|
vhost_net_cleanup(s->vhost_net);
|
|
s->vhost_net = NULL;
|
|
}
|
|
|
|
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, false);
|
|
tap_write_poll(s, false);
|
|
close(s->fd);
|
|
s->fd = -1;
|
|
}
|
|
|
|
static void tap_poll(NetClientState *nc, bool enable)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
tap_read_poll(s, enable);
|
|
tap_write_poll(s, enable);
|
|
}
|
|
|
|
int tap_get_fd(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP);
|
|
return s->fd;
|
|
}
|
|
|
|
/* fd support */
|
|
|
|
static NetClientInfo net_tap_info = {
|
|
.type = NET_CLIENT_OPTIONS_KIND_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(NetClientState *peer,
|
|
const char *model,
|
|
const char *name,
|
|
int fd,
|
|
int vnet_hdr)
|
|
{
|
|
NetClientState *nc;
|
|
TAPState *s;
|
|
|
|
nc = qemu_new_net_client(&net_tap_info, peer, model, name);
|
|
|
|
s = DO_UPCAST(TAPState, nc, nc);
|
|
|
|
s->fd = fd;
|
|
s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
|
|
s->using_vnet_hdr = false;
|
|
s->has_ufo = tap_probe_has_ufo(s->fd);
|
|
s->enabled = true;
|
|
tap_set_offload(&s->nc, 0, 0, 0, 0, 0);
|
|
/*
|
|
* Make sure host header length is set correctly in tap:
|
|
* it might have been modified by another instance of qemu.
|
|
*/
|
|
if (tap_probe_vnet_hdr_len(s->fd, s->host_vnet_hdr_len)) {
|
|
tap_fd_set_vnet_hdr_len(s->fd, s->host_vnet_hdr_len);
|
|
}
|
|
tap_read_poll(s, true);
|
|
s->vhost_net = NULL;
|
|
return s;
|
|
}
|
|
|
|
static int launch_script(const char *setup_script, const char *ifname, int fd)
|
|
{
|
|
int pid, status;
|
|
char *args[3];
|
|
char **parg;
|
|
|
|
/* 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 */
|
|
}
|
|
|
|
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
|
|
return 0;
|
|
}
|
|
}
|
|
fprintf(stderr, "%s: could not launch network script\n", setup_script);
|
|
return -1;
|
|
}
|
|
|
|
static int recv_fd(int c)
|
|
{
|
|
int fd;
|
|
uint8_t msgbuf[CMSG_SPACE(sizeof(fd))];
|
|
struct msghdr msg = {
|
|
.msg_control = msgbuf,
|
|
.msg_controllen = sizeof(msgbuf),
|
|
};
|
|
struct cmsghdr *cmsg;
|
|
struct iovec iov;
|
|
uint8_t req[1];
|
|
ssize_t len;
|
|
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
|
|
msg.msg_controllen = cmsg->cmsg_len;
|
|
|
|
iov.iov_base = req;
|
|
iov.iov_len = sizeof(req);
|
|
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
|
|
len = recvmsg(c, &msg, 0);
|
|
if (len > 0) {
|
|
memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
|
|
return fd;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static int net_bridge_run_helper(const char *helper, const char *bridge)
|
|
{
|
|
sigset_t oldmask, mask;
|
|
int pid, status;
|
|
char *args[5];
|
|
char **parg;
|
|
int sv[2];
|
|
|
|
sigemptyset(&mask);
|
|
sigaddset(&mask, SIGCHLD);
|
|
sigprocmask(SIG_BLOCK, &mask, &oldmask);
|
|
|
|
if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) {
|
|
return -1;
|
|
}
|
|
|
|
/* try to launch bridge helper */
|
|
pid = fork();
|
|
if (pid == 0) {
|
|
int open_max = sysconf(_SC_OPEN_MAX), i;
|
|
char fd_buf[6+10];
|
|
char br_buf[6+IFNAMSIZ] = {0};
|
|
char helper_cmd[PATH_MAX + sizeof(fd_buf) + sizeof(br_buf) + 15];
|
|
|
|
for (i = 0; i < open_max; i++) {
|
|
if (i != STDIN_FILENO &&
|
|
i != STDOUT_FILENO &&
|
|
i != STDERR_FILENO &&
|
|
i != sv[1]) {
|
|
close(i);
|
|
}
|
|
}
|
|
|
|
snprintf(fd_buf, sizeof(fd_buf), "%s%d", "--fd=", sv[1]);
|
|
|
|
if (strrchr(helper, ' ') || strrchr(helper, '\t')) {
|
|
/* assume helper is a command */
|
|
|
|
if (strstr(helper, "--br=") == NULL) {
|
|
snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge);
|
|
}
|
|
|
|
snprintf(helper_cmd, sizeof(helper_cmd), "%s %s %s %s",
|
|
helper, "--use-vnet", fd_buf, br_buf);
|
|
|
|
parg = args;
|
|
*parg++ = (char *)"sh";
|
|
*parg++ = (char *)"-c";
|
|
*parg++ = helper_cmd;
|
|
*parg++ = NULL;
|
|
|
|
execv("/bin/sh", args);
|
|
} else {
|
|
/* assume helper is just the executable path name */
|
|
|
|
snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge);
|
|
|
|
parg = args;
|
|
*parg++ = (char *)helper;
|
|
*parg++ = (char *)"--use-vnet";
|
|
*parg++ = fd_buf;
|
|
*parg++ = br_buf;
|
|
*parg++ = NULL;
|
|
|
|
execv(helper, args);
|
|
}
|
|
_exit(1);
|
|
|
|
} else if (pid > 0) {
|
|
int fd;
|
|
|
|
close(sv[1]);
|
|
|
|
do {
|
|
fd = recv_fd(sv[0]);
|
|
} while (fd == -1 && errno == EINTR);
|
|
|
|
close(sv[0]);
|
|
|
|
while (waitpid(pid, &status, 0) != pid) {
|
|
/* loop */
|
|
}
|
|
sigprocmask(SIG_SETMASK, &oldmask, NULL);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "failed to recv file descriptor\n");
|
|
return -1;
|
|
}
|
|
|
|
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
|
|
return fd;
|
|
}
|
|
}
|
|
fprintf(stderr, "failed to launch bridge helper\n");
|
|
return -1;
|
|
}
|
|
|
|
int net_init_bridge(const NetClientOptions *opts, const char *name,
|
|
NetClientState *peer)
|
|
{
|
|
const NetdevBridgeOptions *bridge;
|
|
const char *helper, *br;
|
|
|
|
TAPState *s;
|
|
int fd, vnet_hdr;
|
|
|
|
assert(opts->kind == NET_CLIENT_OPTIONS_KIND_BRIDGE);
|
|
bridge = opts->bridge;
|
|
|
|
helper = bridge->has_helper ? bridge->helper : DEFAULT_BRIDGE_HELPER;
|
|
br = bridge->has_br ? bridge->br : DEFAULT_BRIDGE_INTERFACE;
|
|
|
|
fd = net_bridge_run_helper(helper, br);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
|
|
vnet_hdr = tap_probe_vnet_hdr(fd);
|
|
|
|
s = net_tap_fd_init(peer, "bridge", name, fd, vnet_hdr);
|
|
if (!s) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s,br=%s", helper,
|
|
br);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr,
|
|
const char *setup_script, char *ifname,
|
|
size_t ifname_sz, int mq_required)
|
|
{
|
|
int fd, vnet_hdr_required;
|
|
|
|
if (tap->has_vnet_hdr) {
|
|
*vnet_hdr = tap->vnet_hdr;
|
|
vnet_hdr_required = *vnet_hdr;
|
|
} else {
|
|
*vnet_hdr = 1;
|
|
vnet_hdr_required = 0;
|
|
}
|
|
|
|
TFR(fd = tap_open(ifname, ifname_sz, vnet_hdr, vnet_hdr_required,
|
|
mq_required));
|
|
if (fd < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (setup_script &&
|
|
setup_script[0] != '\0' &&
|
|
strcmp(setup_script, "no") != 0 &&
|
|
launch_script(setup_script, ifname, fd)) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
#define MAX_TAP_QUEUES 1024
|
|
|
|
static int net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
|
|
const char *model, const char *name,
|
|
const char *ifname, const char *script,
|
|
const char *downscript, const char *vhostfdname,
|
|
int vnet_hdr, int fd)
|
|
{
|
|
TAPState *s;
|
|
|
|
s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
|
|
if (!s) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
if (tap_set_sndbuf(s->fd, tap) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (tap->has_fd || tap->has_fds) {
|
|
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd);
|
|
} else if (tap->has_helper) {
|
|
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s",
|
|
tap->helper);
|
|
} else {
|
|
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);
|
|
}
|
|
}
|
|
|
|
if (tap->has_vhost ? tap->vhost :
|
|
vhostfdname || (tap->has_vhostforce && tap->vhostforce)) {
|
|
int vhostfd;
|
|
|
|
if (tap->has_vhostfd || tap->has_vhostfds) {
|
|
vhostfd = monitor_handle_fd_param(cur_mon, vhostfdname);
|
|
if (vhostfd == -1) {
|
|
return -1;
|
|
}
|
|
} else {
|
|
vhostfd = -1;
|
|
}
|
|
|
|
s->vhost_net = vhost_net_init(&s->nc, vhostfd,
|
|
tap->has_vhostforce && tap->vhostforce);
|
|
if (!s->vhost_net) {
|
|
error_report("vhost-net requested but could not be initialized");
|
|
return -1;
|
|
}
|
|
} else if (tap->has_vhostfd || tap->has_vhostfds) {
|
|
error_report("vhostfd= is not valid without vhost");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_fds(char *str, char *fds[], int max)
|
|
{
|
|
char *ptr = str, *this;
|
|
size_t len = strlen(str);
|
|
int i = 0;
|
|
|
|
while (i < max && ptr < str + len) {
|
|
this = strchr(ptr, ':');
|
|
|
|
if (this == NULL) {
|
|
fds[i] = g_strdup(ptr);
|
|
} else {
|
|
fds[i] = g_strndup(ptr, this - ptr);
|
|
}
|
|
|
|
i++;
|
|
if (this == NULL) {
|
|
break;
|
|
} else {
|
|
ptr = this + 1;
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
int net_init_tap(const NetClientOptions *opts, const char *name,
|
|
NetClientState *peer)
|
|
{
|
|
const NetdevTapOptions *tap;
|
|
int fd, vnet_hdr = 0, i = 0, queues;
|
|
/* for the no-fd, no-helper case */
|
|
const char *script = NULL; /* suppress wrong "uninit'd use" gcc warning */
|
|
const char *downscript = NULL;
|
|
const char *vhostfdname;
|
|
char ifname[128];
|
|
|
|
assert(opts->kind == NET_CLIENT_OPTIONS_KIND_TAP);
|
|
tap = opts->tap;
|
|
queues = tap->has_queues ? tap->queues : 1;
|
|
vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL;
|
|
|
|
/* QEMU vlans does not support multiqueue tap, in this case peer is set.
|
|
* For -netdev, peer is always NULL. */
|
|
if (peer && (tap->has_queues || tap->has_fds || tap->has_vhostfds)) {
|
|
error_report("Multiqueue tap cannot be used with QEMU vlans");
|
|
return -1;
|
|
}
|
|
|
|
if (tap->has_fd) {
|
|
if (tap->has_ifname || tap->has_script || tap->has_downscript ||
|
|
tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
|
|
tap->has_fds || tap->has_vhostfds) {
|
|
error_report("ifname=, script=, downscript=, vnet_hdr=, "
|
|
"helper=, queues=, fds=, and vhostfds= "
|
|
"are invalid with fd=");
|
|
return -1;
|
|
}
|
|
|
|
fd = monitor_handle_fd_param(cur_mon, tap->fd);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
|
|
vnet_hdr = tap_probe_vnet_hdr(fd);
|
|
|
|
if (net_init_tap_one(tap, peer, "tap", name, NULL,
|
|
script, downscript,
|
|
vhostfdname, vnet_hdr, fd)) {
|
|
return -1;
|
|
}
|
|
} else if (tap->has_fds) {
|
|
char *fds[MAX_TAP_QUEUES];
|
|
char *vhost_fds[MAX_TAP_QUEUES];
|
|
int nfds, nvhosts;
|
|
|
|
if (tap->has_ifname || tap->has_script || tap->has_downscript ||
|
|
tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
|
|
tap->has_vhostfd) {
|
|
error_report("ifname=, script=, downscript=, vnet_hdr=, "
|
|
"helper=, queues=, and vhostfd= "
|
|
"are invalid with fds=");
|
|
return -1;
|
|
}
|
|
|
|
nfds = get_fds(tap->fds, fds, MAX_TAP_QUEUES);
|
|
if (tap->has_vhostfds) {
|
|
nvhosts = get_fds(tap->vhostfds, vhost_fds, MAX_TAP_QUEUES);
|
|
if (nfds != nvhosts) {
|
|
error_report("The number of fds passed does not match the "
|
|
"number of vhostfds passed");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < nfds; i++) {
|
|
fd = monitor_handle_fd_param(cur_mon, fds[i]);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
|
|
if (i == 0) {
|
|
vnet_hdr = tap_probe_vnet_hdr(fd);
|
|
} else if (vnet_hdr != tap_probe_vnet_hdr(fd)) {
|
|
error_report("vnet_hdr not consistent across given tap fds");
|
|
return -1;
|
|
}
|
|
|
|
if (net_init_tap_one(tap, peer, "tap", name, ifname,
|
|
script, downscript,
|
|
tap->has_vhostfds ? vhost_fds[i] : NULL,
|
|
vnet_hdr, fd)) {
|
|
return -1;
|
|
}
|
|
}
|
|
} else if (tap->has_helper) {
|
|
if (tap->has_ifname || tap->has_script || tap->has_downscript ||
|
|
tap->has_vnet_hdr || tap->has_queues || tap->has_vhostfds) {
|
|
error_report("ifname=, script=, downscript=, and vnet_hdr= "
|
|
"queues=, and vhostfds= are invalid with helper=");
|
|
return -1;
|
|
}
|
|
|
|
fd = net_bridge_run_helper(tap->helper, DEFAULT_BRIDGE_INTERFACE);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
vnet_hdr = tap_probe_vnet_hdr(fd);
|
|
|
|
if (net_init_tap_one(tap, peer, "bridge", name, ifname,
|
|
script, downscript, vhostfdname,
|
|
vnet_hdr, fd)) {
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (tap->has_vhostfds) {
|
|
error_report("vhostfds= is invalid if fds= wasn't specified");
|
|
return -1;
|
|
}
|
|
script = tap->has_script ? tap->script : DEFAULT_NETWORK_SCRIPT;
|
|
downscript = tap->has_downscript ? tap->downscript :
|
|
DEFAULT_NETWORK_DOWN_SCRIPT;
|
|
|
|
if (tap->has_ifname) {
|
|
pstrcpy(ifname, sizeof ifname, tap->ifname);
|
|
} else {
|
|
ifname[0] = '\0';
|
|
}
|
|
|
|
for (i = 0; i < queues; i++) {
|
|
fd = net_tap_init(tap, &vnet_hdr, i >= 1 ? "no" : script,
|
|
ifname, sizeof ifname, queues > 1);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
if (queues > 1 && i == 0 && !tap->has_ifname) {
|
|
if (tap_fd_get_ifname(fd, ifname)) {
|
|
error_report("Fail to get ifname");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (net_init_tap_one(tap, peer, "tap", name, ifname,
|
|
i >= 1 ? "no" : script,
|
|
i >= 1 ? "no" : downscript,
|
|
vhostfdname, vnet_hdr, fd)) {
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
VHostNetState *tap_get_vhost_net(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP);
|
|
return s->vhost_net;
|
|
}
|
|
|
|
int tap_enable(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
int ret;
|
|
|
|
if (s->enabled) {
|
|
return 0;
|
|
} else {
|
|
ret = tap_fd_enable(s->fd);
|
|
if (ret == 0) {
|
|
s->enabled = true;
|
|
tap_update_fd_handler(s);
|
|
}
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
int tap_disable(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
int ret;
|
|
|
|
if (s->enabled == 0) {
|
|
return 0;
|
|
} else {
|
|
ret = tap_fd_disable(s->fd);
|
|
if (ret == 0) {
|
|
qemu_purge_queued_packets(nc);
|
|
s->enabled = false;
|
|
tap_update_fd_handler(s);
|
|
}
|
|
return ret;
|
|
}
|
|
}
|