mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-12 05:56:06 +00:00
df6c2a0fb2
net_tap_init() always sets vnet_hdr using qemu_opt_get_bool(), but initialize it in net_init_tap() just to reduce confusion. Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
450 lines
11 KiB
C
450 lines
11 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 "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 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);
|
|
}
|
|
|
|
/* 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,
|
|
.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")) {
|
|
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);
|
|
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);
|
|
}
|
|
}
|
|
|
|
if (vlan) {
|
|
vlan->nb_host_devs++;
|
|
}
|
|
|
|
return 0;
|
|
}
|