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qemu/net.c

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/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* 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.h"
#include "config-host.h"
#include "net/tap.h"
#include "net/socket.h"
#include "net/dump.h"
#include "net/slirp.h"
#include "net/vde.h"
#include "net/util.h"
#include "monitor.h"
#include "qemu-common.h"
#include "qemu_socket.h"
#include "qmp-commands.h"
#include "hw/qdev.h"
#include "iov.h"
/* Net bridge is currently not supported for W32. */
#if !defined(_WIN32)
# define CONFIG_NET_BRIDGE
#endif
static QTAILQ_HEAD(, VLANState) vlans;
static QTAILQ_HEAD(, VLANClientState) non_vlan_clients;
int default_net = 1;
/***********************************************************/
/* network device redirectors */
#if defined(DEBUG_NET)
static void hex_dump(FILE *f, const uint8_t *buf, int size)
{
int len, i, j, c;
for(i=0;i<size;i+=16) {
len = size - i;
if (len > 16)
len = 16;
fprintf(f, "%08x ", i);
for(j=0;j<16;j++) {
if (j < len)
fprintf(f, " %02x", buf[i+j]);
else
fprintf(f, " ");
}
fprintf(f, " ");
for(j=0;j<len;j++) {
c = buf[i+j];
if (c < ' ' || c > '~')
c = '.';
fprintf(f, "%c", c);
}
fprintf(f, "\n");
}
}
#endif
static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
{
const char *p, *p1;
int len;
p = *pp;
p1 = strchr(p, sep);
if (!p1)
return -1;
len = p1 - p;
p1++;
if (buf_size > 0) {
if (len > buf_size - 1)
len = buf_size - 1;
memcpy(buf, p, len);
buf[len] = '\0';
}
*pp = p1;
return 0;
}
int parse_host_port(struct sockaddr_in *saddr, const char *str)
{
char buf[512];
struct hostent *he;
const char *p, *r;
int port;
p = str;
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
return -1;
saddr->sin_family = AF_INET;
if (buf[0] == '\0') {
saddr->sin_addr.s_addr = 0;
} else {
if (qemu_isdigit(buf[0])) {
if (!inet_aton(buf, &saddr->sin_addr))
return -1;
} else {
if ((he = gethostbyname(buf)) == NULL)
return - 1;
saddr->sin_addr = *(struct in_addr *)he->h_addr;
}
}
port = strtol(p, (char **)&r, 0);
if (r == p)
return -1;
saddr->sin_port = htons(port);
return 0;
}
void qemu_format_nic_info_str(VLANClientState *vc, uint8_t macaddr[6])
{
snprintf(vc->info_str, sizeof(vc->info_str),
"model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
vc->model,
macaddr[0], macaddr[1], macaddr[2],
macaddr[3], macaddr[4], macaddr[5]);
}
void qemu_macaddr_default_if_unset(MACAddr *macaddr)
{
static int index = 0;
static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
return;
macaddr->a[0] = 0x52;
macaddr->a[1] = 0x54;
macaddr->a[2] = 0x00;
macaddr->a[3] = 0x12;
macaddr->a[4] = 0x34;
macaddr->a[5] = 0x56 + index++;
}
static char *assign_name(VLANClientState *vc1, const char *model)
{
VLANState *vlan;
VLANClientState *vc;
char buf[256];
int id = 0;
QTAILQ_FOREACH(vlan, &vlans, next) {
QTAILQ_FOREACH(vc, &vlan->clients, next) {
if (vc != vc1 && strcmp(vc->model, model) == 0) {
id++;
}
}
}
QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
if (vc != vc1 && strcmp(vc->model, model) == 0) {
id++;
}
}
snprintf(buf, sizeof(buf), "%s.%d", model, id);
return g_strdup(buf);
}
static ssize_t qemu_deliver_packet(VLANClientState *sender,
unsigned flags,
const uint8_t *data,
size_t size,
void *opaque);
static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
void *opaque);
VLANClientState *qemu_new_net_client(NetClientInfo *info,
VLANState *vlan,
VLANClientState *peer,
const char *model,
const char *name)
{
VLANClientState *vc;
assert(info->size >= sizeof(VLANClientState));
vc = g_malloc0(info->size);
vc->info = info;
vc->model = g_strdup(model);
if (name) {
vc->name = g_strdup(name);
} else {
vc->name = assign_name(vc, model);
}
if (vlan) {
assert(!peer);
vc->vlan = vlan;
QTAILQ_INSERT_TAIL(&vc->vlan->clients, vc, next);
} else {
if (peer) {
assert(!peer->peer);
vc->peer = peer;
peer->peer = vc;
}
QTAILQ_INSERT_TAIL(&non_vlan_clients, vc, next);
vc->send_queue = qemu_new_net_queue(qemu_deliver_packet,
qemu_deliver_packet_iov,
vc);
}
return vc;
}
NICState *qemu_new_nic(NetClientInfo *info,
NICConf *conf,
const char *model,
const char *name,
void *opaque)
{
VLANClientState *nc;
NICState *nic;
assert(info->type == NET_CLIENT_TYPE_NIC);
assert(info->size >= sizeof(NICState));
nc = qemu_new_net_client(info, conf->vlan, conf->peer, model, name);
nic = DO_UPCAST(NICState, nc, nc);
nic->conf = conf;
nic->opaque = opaque;
return nic;
}
static void qemu_cleanup_vlan_client(VLANClientState *vc)
{
if (vc->vlan) {
QTAILQ_REMOVE(&vc->vlan->clients, vc, next);
} else {
QTAILQ_REMOVE(&non_vlan_clients, vc, next);
}
if (vc->info->cleanup) {
vc->info->cleanup(vc);
}
}
static void qemu_free_vlan_client(VLANClientState *vc)
{
if (!vc->vlan) {
if (vc->send_queue) {
qemu_del_net_queue(vc->send_queue);
}
if (vc->peer) {
vc->peer->peer = NULL;
}
}
g_free(vc->name);
g_free(vc->model);
g_free(vc);
}
void qemu_del_vlan_client(VLANClientState *vc)
{
/* If there is a peer NIC, delete and cleanup client, but do not free. */
if (!vc->vlan && vc->peer && vc->peer->info->type == NET_CLIENT_TYPE_NIC) {
NICState *nic = DO_UPCAST(NICState, nc, vc->peer);
if (nic->peer_deleted) {
return;
}
nic->peer_deleted = true;
/* Let NIC know peer is gone. */
vc->peer->link_down = true;
if (vc->peer->info->link_status_changed) {
vc->peer->info->link_status_changed(vc->peer);
}
qemu_cleanup_vlan_client(vc);
return;
}
/* If this is a peer NIC and peer has already been deleted, free it now. */
if (!vc->vlan && vc->peer && vc->info->type == NET_CLIENT_TYPE_NIC) {
NICState *nic = DO_UPCAST(NICState, nc, vc);
if (nic->peer_deleted) {
qemu_free_vlan_client(vc->peer);
}
}
qemu_cleanup_vlan_client(vc);
qemu_free_vlan_client(vc);
}
VLANClientState *
qemu_find_vlan_client_by_name(Monitor *mon, int vlan_id,
const char *client_str)
{
VLANState *vlan;
VLANClientState *vc;
vlan = qemu_find_vlan(vlan_id, 0);
if (!vlan) {
monitor_printf(mon, "unknown VLAN %d\n", vlan_id);
return NULL;
}
QTAILQ_FOREACH(vc, &vlan->clients, next) {
if (!strcmp(vc->name, client_str)) {
break;
}
}
if (!vc) {
monitor_printf(mon, "can't find device %s on VLAN %d\n",
client_str, vlan_id);
}
return vc;
}
void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
{
VLANClientState *nc;
VLANState *vlan;
QTAILQ_FOREACH(nc, &non_vlan_clients, next) {
if (nc->info->type == NET_CLIENT_TYPE_NIC) {
func(DO_UPCAST(NICState, nc, nc), opaque);
}
}
QTAILQ_FOREACH(vlan, &vlans, next) {
QTAILQ_FOREACH(nc, &vlan->clients, next) {
if (nc->info->type == NET_CLIENT_TYPE_NIC) {
func(DO_UPCAST(NICState, nc, nc), opaque);
}
}
}
}
int qemu_can_send_packet(VLANClientState *sender)
{
VLANState *vlan = sender->vlan;
VLANClientState *vc;
if (sender->peer) {
if (sender->peer->receive_disabled) {
return 0;
} else if (sender->peer->info->can_receive &&
!sender->peer->info->can_receive(sender->peer)) {
return 0;
} else {
return 1;
}
}
if (!sender->vlan) {
return 1;
}
QTAILQ_FOREACH(vc, &vlan->clients, next) {
if (vc == sender) {
continue;
}
/* no can_receive() handler, they can always receive */
if (vc->info->can_receive && !vc->info->can_receive(vc)) {
return 0;
}
}
return 1;
}
static ssize_t qemu_deliver_packet(VLANClientState *sender,
unsigned flags,
const uint8_t *data,
size_t size,
void *opaque)
{
VLANClientState *vc = opaque;
ssize_t ret;
if (vc->link_down) {
return size;
}
if (vc->receive_disabled) {
return 0;
}
if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
ret = vc->info->receive_raw(vc, data, size);
} else {
ret = vc->info->receive(vc, data, size);
}
if (ret == 0) {
vc->receive_disabled = 1;
};
return ret;
}
static ssize_t qemu_vlan_deliver_packet(VLANClientState *sender,
unsigned flags,
const uint8_t *buf,
size_t size,
void *opaque)
{
VLANState *vlan = opaque;
VLANClientState *vc;
ssize_t ret = -1;
QTAILQ_FOREACH(vc, &vlan->clients, next) {
ssize_t len;
if (vc == sender) {
continue;
}
if (vc->link_down) {
ret = size;
continue;
}
if (vc->receive_disabled) {
ret = 0;
continue;
}
if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {
len = vc->info->receive_raw(vc, buf, size);
} else {
len = vc->info->receive(vc, buf, size);
}
if (len == 0) {
vc->receive_disabled = 1;
}
ret = (ret >= 0) ? ret : len;
}
return ret;
}
void qemu_purge_queued_packets(VLANClientState *vc)
{
NetQueue *queue;
if (!vc->peer && !vc->vlan) {
return;
}
if (vc->peer) {
queue = vc->peer->send_queue;
} else {
queue = vc->vlan->send_queue;
}
qemu_net_queue_purge(queue, vc);
}
void qemu_flush_queued_packets(VLANClientState *vc)
{
NetQueue *queue;
vc->receive_disabled = 0;
if (vc->vlan) {
queue = vc->vlan->send_queue;
} else {
queue = vc->send_queue;
}
qemu_net_queue_flush(queue);
}
static ssize_t qemu_send_packet_async_with_flags(VLANClientState *sender,
unsigned flags,
const uint8_t *buf, int size,
NetPacketSent *sent_cb)
{
NetQueue *queue;
#ifdef DEBUG_NET
printf("qemu_send_packet_async:\n");
hex_dump(stdout, buf, size);
#endif
if (sender->link_down || (!sender->peer && !sender->vlan)) {
return size;
}
if (sender->peer) {
queue = sender->peer->send_queue;
} else {
queue = sender->vlan->send_queue;
}
return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
}
ssize_t qemu_send_packet_async(VLANClientState *sender,
const uint8_t *buf, int size,
NetPacketSent *sent_cb)
{
return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
buf, size, sent_cb);
}
void qemu_send_packet(VLANClientState *vc, const uint8_t *buf, int size)
{
qemu_send_packet_async(vc, buf, size, NULL);
}
ssize_t qemu_send_packet_raw(VLANClientState *vc, const uint8_t *buf, int size)
{
return qemu_send_packet_async_with_flags(vc, QEMU_NET_PACKET_FLAG_RAW,
buf, size, NULL);
}
static ssize_t vc_sendv_compat(VLANClientState *vc, const struct iovec *iov,
int iovcnt)
{
uint8_t buffer[4096];
size_t offset;
offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
return vc->info->receive(vc, buffer, offset);
}
static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
void *opaque)
{
VLANClientState *vc = opaque;
if (vc->link_down) {
return iov_size(iov, iovcnt);
}
if (vc->info->receive_iov) {
return vc->info->receive_iov(vc, iov, iovcnt);
} else {
return vc_sendv_compat(vc, iov, iovcnt);
}
}
static ssize_t qemu_vlan_deliver_packet_iov(VLANClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
void *opaque)
{
VLANState *vlan = opaque;
VLANClientState *vc;
ssize_t ret = -1;
QTAILQ_FOREACH(vc, &vlan->clients, next) {
ssize_t len;
if (vc == sender) {
continue;
}
if (vc->link_down) {
ret = iov_size(iov, iovcnt);
continue;
}
assert(!(flags & QEMU_NET_PACKET_FLAG_RAW));
if (vc->info->receive_iov) {
len = vc->info->receive_iov(vc, iov, iovcnt);
} else {
len = vc_sendv_compat(vc, iov, iovcnt);
}
ret = (ret >= 0) ? ret : len;
}
return ret;
}
ssize_t qemu_sendv_packet_async(VLANClientState *sender,
const struct iovec *iov, int iovcnt,
NetPacketSent *sent_cb)
{
NetQueue *queue;
if (sender->link_down || (!sender->peer && !sender->vlan)) {
return iov_size(iov, iovcnt);
}
if (sender->peer) {
queue = sender->peer->send_queue;
} else {
queue = sender->vlan->send_queue;
}
return qemu_net_queue_send_iov(queue, sender,
QEMU_NET_PACKET_FLAG_NONE,
iov, iovcnt, sent_cb);
}
ssize_t
qemu_sendv_packet(VLANClientState *vc, const struct iovec *iov, int iovcnt)
{
return qemu_sendv_packet_async(vc, iov, iovcnt, NULL);
}
/* find or alloc a new VLAN */
VLANState *qemu_find_vlan(int id, int allocate)
{
VLANState *vlan;
QTAILQ_FOREACH(vlan, &vlans, next) {
if (vlan->id == id) {
return vlan;
}
}
if (!allocate) {
return NULL;
}
vlan = g_malloc0(sizeof(VLANState));
vlan->id = id;
QTAILQ_INIT(&vlan->clients);
vlan->send_queue = qemu_new_net_queue(qemu_vlan_deliver_packet,
qemu_vlan_deliver_packet_iov,
vlan);
QTAILQ_INSERT_TAIL(&vlans, vlan, next);
return vlan;
}
VLANClientState *qemu_find_netdev(const char *id)
{
VLANClientState *vc;
QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
if (vc->info->type == NET_CLIENT_TYPE_NIC)
continue;
if (!strcmp(vc->name, id)) {
return vc;
}
}
return NULL;
}
static int nic_get_free_idx(void)
{
int index;
for (index = 0; index < MAX_NICS; index++)
if (!nd_table[index].used)
return index;
return -1;
}
int qemu_show_nic_models(const char *arg, const char *const *models)
{
int i;
if (!arg || strcmp(arg, "?"))
return 0;
fprintf(stderr, "qemu: Supported NIC models: ");
for (i = 0 ; models[i]; i++)
fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
return 1;
}
void qemu_check_nic_model(NICInfo *nd, const char *model)
{
const char *models[2];
models[0] = model;
models[1] = NULL;
if (qemu_show_nic_models(nd->model, models))
exit(0);
if (qemu_find_nic_model(nd, models, model) < 0)
exit(1);
}
int qemu_find_nic_model(NICInfo *nd, const char * const *models,
const char *default_model)
{
int i;
if (!nd->model)
nd->model = g_strdup(default_model);
for (i = 0 ; models[i]; i++) {
if (strcmp(nd->model, models[i]) == 0)
return i;
}
error_report("Unsupported NIC model: %s", nd->model);
return -1;
}
int net_handle_fd_param(Monitor *mon, const char *param)
{
int fd;
if (!qemu_isdigit(param[0]) && mon) {
fd = monitor_get_fd(mon, param);
if (fd == -1) {
error_report("No file descriptor named %s found", param);
return -1;
}
} else {
fd = qemu_parse_fd(param);
}
return fd;
}
static int net_init_nic(QemuOpts *opts, const char *name, VLANState *vlan)
{
int idx;
NICInfo *nd;
const char *netdev;
idx = nic_get_free_idx();
if (idx == -1 || nb_nics >= MAX_NICS) {
error_report("Too Many NICs");
return -1;
}
nd = &nd_table[idx];
memset(nd, 0, sizeof(*nd));
if ((netdev = qemu_opt_get(opts, "netdev"))) {
nd->netdev = qemu_find_netdev(netdev);
if (!nd->netdev) {
error_report("netdev '%s' not found", netdev);
return -1;
}
} else {
assert(vlan);
nd->vlan = vlan;
}
if (name) {
nd->name = g_strdup(name);
}
if (qemu_opt_get(opts, "model")) {
nd->model = g_strdup(qemu_opt_get(opts, "model"));
}
if (qemu_opt_get(opts, "addr")) {
nd->devaddr = g_strdup(qemu_opt_get(opts, "addr"));
}
if (qemu_opt_get(opts, "macaddr") &&
net_parse_macaddr(nd->macaddr.a, qemu_opt_get(opts, "macaddr")) < 0) {
error_report("invalid syntax for ethernet address");
return -1;
}
qemu_macaddr_default_if_unset(&nd->macaddr);
nd->nvectors = qemu_opt_get_number(opts, "vectors",
DEV_NVECTORS_UNSPECIFIED);
if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
(nd->nvectors < 0 || nd->nvectors > 0x7ffffff)) {
error_report("invalid # of vectors: %d", nd->nvectors);
return -1;
}
nd->used = 1;
nb_nics++;
return idx;
}
#define NET_COMMON_PARAMS_DESC \
{ \
.name = "type", \
.type = QEMU_OPT_STRING, \
.help = "net client type (nic, tap etc.)", \
}, { \
.name = "vlan", \
.type = QEMU_OPT_NUMBER, \
.help = "vlan number", \
}, { \
.name = "name", \
.type = QEMU_OPT_STRING, \
.help = "identifier for monitor commands", \
}
typedef int (*net_client_init_func)(QemuOpts *opts,
const char *name,
VLANState *vlan);
/* magic number, but compiler will warn if too small */
#define NET_MAX_DESC 20
static const struct {
const char *type;
net_client_init_func init;
QemuOptDesc desc[NET_MAX_DESC];
} net_client_types[NET_CLIENT_TYPE_MAX] = {
[NET_CLIENT_TYPE_NONE] = {
.type = "none",
.desc = {
NET_COMMON_PARAMS_DESC,
{ /* end of list */ }
},
},
[NET_CLIENT_TYPE_NIC] = {
.type = "nic",
.init = net_init_nic,
.desc = {
NET_COMMON_PARAMS_DESC,
{
.name = "netdev",
.type = QEMU_OPT_STRING,
.help = "id of -netdev to connect to",
},
{
.name = "macaddr",
.type = QEMU_OPT_STRING,
.help = "MAC address",
}, {
.name = "model",
.type = QEMU_OPT_STRING,
.help = "device model (e1000, rtl8139, virtio etc.)",
}, {
.name = "addr",
.type = QEMU_OPT_STRING,
.help = "PCI device address",
}, {
.name = "vectors",
.type = QEMU_OPT_NUMBER,
.help = "number of MSI-x vectors, 0 to disable MSI-X",
},
{ /* end of list */ }
},
},
#ifdef CONFIG_SLIRP
[NET_CLIENT_TYPE_USER] = {
.type = "user",
.init = net_init_slirp,
.desc = {
NET_COMMON_PARAMS_DESC,
{
.name = "hostname",
.type = QEMU_OPT_STRING,
.help = "client hostname reported by the builtin DHCP server",
}, {
.name = "restrict",
.type = QEMU_OPT_STRING,
.help = "isolate the guest from the host (y|yes|n|no)",
}, {
.name = "ip",
.type = QEMU_OPT_STRING,
.help = "legacy parameter, use net= instead",
}, {
.name = "net",
.type = QEMU_OPT_STRING,
.help = "IP address and optional netmask",
}, {
.name = "host",
.type = QEMU_OPT_STRING,
.help = "guest-visible address of the host",
}, {
.name = "tftp",
.type = QEMU_OPT_STRING,
.help = "root directory of the built-in TFTP server",
}, {
.name = "bootfile",
.type = QEMU_OPT_STRING,
.help = "BOOTP filename, for use with tftp=",
}, {
.name = "dhcpstart",
.type = QEMU_OPT_STRING,
.help = "the first of the 16 IPs the built-in DHCP server can assign",
}, {
.name = "dns",
.type = QEMU_OPT_STRING,
.help = "guest-visible address of the virtual nameserver",
}, {
.name = "smb",
.type = QEMU_OPT_STRING,
.help = "root directory of the built-in SMB server",
}, {
.name = "smbserver",
.type = QEMU_OPT_STRING,
.help = "IP address of the built-in SMB server",
}, {
.name = "hostfwd",
.type = QEMU_OPT_STRING,
.help = "guest port number to forward incoming TCP or UDP connections",
}, {
.name = "guestfwd",
.type = QEMU_OPT_STRING,
.help = "IP address and port to forward guest TCP connections",
},
{ /* end of list */ }
},
},
#endif
[NET_CLIENT_TYPE_TAP] = {
.type = "tap",
.init = net_init_tap,
.desc = {
NET_COMMON_PARAMS_DESC,
{
.name = "ifname",
.type = QEMU_OPT_STRING,
.help = "interface name",
},
#ifndef _WIN32
{
.name = "fd",
.type = QEMU_OPT_STRING,
.help = "file descriptor of an already opened tap",
}, {
.name = "script",
.type = QEMU_OPT_STRING,
.help = "script to initialize the interface",
}, {
.name = "downscript",
.type = QEMU_OPT_STRING,
.help = "script to shut down the interface",
}, {
#ifdef CONFIG_NET_BRIDGE
.name = "helper",
.type = QEMU_OPT_STRING,
.help = "command to execute to configure bridge",
}, {
#endif
.name = "sndbuf",
.type = QEMU_OPT_SIZE,
.help = "send buffer limit"
}, {
.name = "vnet_hdr",
.type = QEMU_OPT_BOOL,
.help = "enable the IFF_VNET_HDR flag on the tap interface"
}, {
.name = "vhost",
.type = QEMU_OPT_BOOL,
.help = "enable vhost-net network accelerator",
}, {
.name = "vhostfd",
.type = QEMU_OPT_STRING,
.help = "file descriptor of an already opened vhost net device",
}, {
.name = "vhostforce",
.type = QEMU_OPT_BOOL,
.help = "force vhost on for non-MSIX virtio guests",
},
#endif /* _WIN32 */
{ /* end of list */ }
},
},
[NET_CLIENT_TYPE_SOCKET] = {
.type = "socket",
.init = net_init_socket,
.desc = {
NET_COMMON_PARAMS_DESC,
{
.name = "fd",
.type = QEMU_OPT_STRING,
.help = "file descriptor of an already opened socket",
}, {
.name = "listen",
.type = QEMU_OPT_STRING,
.help = "port number, and optional hostname, to listen on",
}, {
.name = "connect",
.type = QEMU_OPT_STRING,
.help = "port number, and optional hostname, to connect to",
}, {
.name = "mcast",
.type = QEMU_OPT_STRING,
.help = "UDP multicast address and port number",
}, {
.name = "localaddr",
.type = QEMU_OPT_STRING,
.help = "source address and port for multicast and udp packets",
}, {
.name = "udp",
.type = QEMU_OPT_STRING,
.help = "UDP unicast address and port number",
},
{ /* end of list */ }
},
},
#ifdef CONFIG_VDE
[NET_CLIENT_TYPE_VDE] = {
.type = "vde",
.init = net_init_vde,
.desc = {
NET_COMMON_PARAMS_DESC,
{
.name = "sock",
.type = QEMU_OPT_STRING,
.help = "socket path",
}, {
.name = "port",
.type = QEMU_OPT_NUMBER,
.help = "port number",
}, {
.name = "group",
.type = QEMU_OPT_STRING,
.help = "group owner of socket",
}, {
.name = "mode",
.type = QEMU_OPT_NUMBER,
.help = "permissions for socket",
},
{ /* end of list */ }
},
},
#endif
[NET_CLIENT_TYPE_DUMP] = {
.type = "dump",
.init = net_init_dump,
.desc = {
NET_COMMON_PARAMS_DESC,
{
.name = "len",
.type = QEMU_OPT_SIZE,
.help = "per-packet size limit (64k default)",
}, {
.name = "file",
.type = QEMU_OPT_STRING,
.help = "dump file path (default is qemu-vlan0.pcap)",
},
{ /* end of list */ }
},
},
#ifdef CONFIG_NET_BRIDGE
[NET_CLIENT_TYPE_BRIDGE] = {
.type = "bridge",
.init = net_init_bridge,
.desc = {
NET_COMMON_PARAMS_DESC,
{
.name = "br",
.type = QEMU_OPT_STRING,
.help = "bridge name",
}, {
.name = "helper",
.type = QEMU_OPT_STRING,
.help = "command to execute to configure bridge",
},
{ /* end of list */ }
},
},
#endif /* CONFIG_NET_BRIDGE */
};
int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
{
const char *name;
const char *type;
int i;
type = qemu_opt_get(opts, "type");
if (!type) {
error_set(errp, QERR_MISSING_PARAMETER, "type");
return -1;
}
if (is_netdev) {
if (strcmp(type, "tap") != 0 &&
#ifdef CONFIG_NET_BRIDGE
strcmp(type, "bridge") != 0 &&
#endif
#ifdef CONFIG_SLIRP
strcmp(type, "user") != 0 &&
#endif
#ifdef CONFIG_VDE
strcmp(type, "vde") != 0 &&
#endif
strcmp(type, "socket") != 0) {
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
"a netdev backend type");
return -1;
}
if (qemu_opt_get(opts, "vlan")) {
error_set(errp, QERR_INVALID_PARAMETER, "vlan");
return -1;
}
if (qemu_opt_get(opts, "name")) {
error_set(errp, QERR_INVALID_PARAMETER, "name");
return -1;
}
if (!qemu_opts_id(opts)) {
error_set(errp, QERR_MISSING_PARAMETER, "id");
return -1;
}
}
name = qemu_opts_id(opts);
if (!name) {
name = qemu_opt_get(opts, "name");
}
for (i = 0; i < NET_CLIENT_TYPE_MAX; i++) {
if (net_client_types[i].type != NULL &&
!strcmp(net_client_types[i].type, type)) {
Error *local_err = NULL;
VLANState *vlan = NULL;
int ret;
qemu_opts_validate(opts, &net_client_types[i].desc[0], &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return -1;
}
/* Do not add to a vlan if it's a -netdev or a nic with a
* netdev= parameter. */
if (!(is_netdev ||
(strcmp(type, "nic") == 0 && qemu_opt_get(opts, "netdev")))) {
vlan = qemu_find_vlan(qemu_opt_get_number(opts, "vlan", 0), 1);
}
ret = 0;
if (net_client_types[i].init) {
ret = net_client_types[i].init(opts, name, vlan);
if (ret < 0) {
/* TODO push error reporting into init() methods */
error_set(errp, QERR_DEVICE_INIT_FAILED, type);
return -1;
}
}
return ret;
}
}
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
"a network client type");
return -1;
}
static int net_host_check_device(const char *device)
{
int i;
const char *valid_param_list[] = { "tap", "socket", "dump"
#ifdef CONFIG_NET_BRIDGE
, "bridge"
#endif
#ifdef CONFIG_SLIRP
,"user"
#endif
#ifdef CONFIG_VDE
,"vde"
#endif
};
for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
if (!strncmp(valid_param_list[i], device,
strlen(valid_param_list[i])))
return 1;
}
return 0;
}
void net_host_device_add(Monitor *mon, const QDict *qdict)
{
const char *device = qdict_get_str(qdict, "device");
const char *opts_str = qdict_get_try_str(qdict, "opts");
Error *local_err = NULL;
QemuOpts *opts;
if (!net_host_check_device(device)) {
monitor_printf(mon, "invalid host network device %s\n", device);
return;
}
opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
if (!opts) {
return;
}
qemu_opt_set(opts, "type", device);
net_client_init(opts, 0, &local_err);
if (error_is_set(&local_err)) {
qerror_report_err(local_err);
error_free(local_err);
monitor_printf(mon, "adding host network device %s failed\n", device);
}
}
void net_host_device_remove(Monitor *mon, const QDict *qdict)
{
VLANClientState *vc;
int vlan_id = qdict_get_int(qdict, "vlan_id");
const char *device = qdict_get_str(qdict, "device");
vc = qemu_find_vlan_client_by_name(mon, vlan_id, device);
if (!vc) {
return;
}
if (!net_host_check_device(vc->model)) {
monitor_printf(mon, "invalid host network device %s\n", device);
return;
}
qemu_del_vlan_client(vc);
}
void netdev_add(QemuOpts *opts, Error **errp)
{
net_client_init(opts, 1, errp);
}
int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
{
Error *local_err = NULL;
QemuOptsList *opts_list;
QemuOpts *opts;
opts_list = qemu_find_opts_err("netdev", &local_err);
if (error_is_set(&local_err)) {
goto exit_err;
}
opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
if (error_is_set(&local_err)) {
goto exit_err;
}
netdev_add(opts, &local_err);
if (error_is_set(&local_err)) {
qemu_opts_del(opts);
goto exit_err;
}
return 0;
exit_err:
qerror_report_err(local_err);
error_free(local_err);
return -1;
}
void qmp_netdev_del(const char *id, Error **errp)
{
VLANClientState *vc;
vc = qemu_find_netdev(id);
if (!vc) {
error_set(errp, QERR_DEVICE_NOT_FOUND, id);
return;
}
qemu_del_vlan_client(vc);
qemu_opts_del(qemu_opts_find(qemu_find_opts_err("netdev", errp), id));
}
static void print_net_client(Monitor *mon, VLANClientState *vc)
{
monitor_printf(mon, "%s: type=%s,%s\n", vc->name,
net_client_types[vc->info->type].type, vc->info_str);
}
void do_info_network(Monitor *mon)
{
VLANState *vlan;
VLANClientState *vc, *peer;
net_client_type type;
QTAILQ_FOREACH(vlan, &vlans, next) {
monitor_printf(mon, "VLAN %d devices:\n", vlan->id);
QTAILQ_FOREACH(vc, &vlan->clients, next) {
monitor_printf(mon, " ");
print_net_client(mon, vc);
}
}
monitor_printf(mon, "Devices not on any VLAN:\n");
QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
peer = vc->peer;
type = vc->info->type;
if (!peer || type == NET_CLIENT_TYPE_NIC) {
monitor_printf(mon, " ");
print_net_client(mon, vc);
} /* else it's a netdev connected to a NIC, printed with the NIC */
if (peer && type == NET_CLIENT_TYPE_NIC) {
monitor_printf(mon, " \\ ");
print_net_client(mon, peer);
}
}
}
void qmp_set_link(const char *name, bool up, Error **errp)
{
VLANState *vlan;
VLANClientState *vc = NULL;
QTAILQ_FOREACH(vlan, &vlans, next) {
QTAILQ_FOREACH(vc, &vlan->clients, next) {
if (strcmp(vc->name, name) == 0) {
goto done;
}
}
}
QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
if (!strcmp(vc->name, name)) {
goto done;
}
}
done:
if (!vc) {
error_set(errp, QERR_DEVICE_NOT_FOUND, name);
return;
}
vc->link_down = !up;
if (vc->info->link_status_changed) {
vc->info->link_status_changed(vc);
}
/* Notify peer. Don't update peer link status: this makes it possible to
* disconnect from host network without notifying the guest.
* FIXME: is disconnected link status change operation useful?
*
* Current behaviour is compatible with qemu vlans where there could be
* multiple clients that can still communicate with each other in
* disconnected mode. For now maintain this compatibility. */
if (vc->peer && vc->peer->info->link_status_changed) {
vc->peer->info->link_status_changed(vc->peer);
}
}
void net_cleanup(void)
{
VLANState *vlan;
VLANClientState *vc, *next_vc;
QTAILQ_FOREACH(vlan, &vlans, next) {
QTAILQ_FOREACH_SAFE(vc, &vlan->clients, next, next_vc) {
qemu_del_vlan_client(vc);
}
}
QTAILQ_FOREACH_SAFE(vc, &non_vlan_clients, next, next_vc) {
qemu_del_vlan_client(vc);
}
}
void net_check_clients(void)
{
VLANState *vlan;
VLANClientState *vc;
int i;
/* Don't warn about the default network setup that you get if
* no command line -net or -netdev options are specified. There
* are two cases that we would otherwise complain about:
* (1) board doesn't support a NIC but the implicit "-net nic"
* requested one
* (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
* sets up a nic that isn't connected to anything.
*/
if (default_net) {
return;
}
QTAILQ_FOREACH(vlan, &vlans, next) {
int has_nic = 0, has_host_dev = 0;
QTAILQ_FOREACH(vc, &vlan->clients, next) {
switch (vc->info->type) {
case NET_CLIENT_TYPE_NIC:
has_nic = 1;
break;
case NET_CLIENT_TYPE_USER:
case NET_CLIENT_TYPE_TAP:
case NET_CLIENT_TYPE_SOCKET:
case NET_CLIENT_TYPE_VDE:
has_host_dev = 1;
break;
default: ;
}
}
if (has_host_dev && !has_nic)
fprintf(stderr, "Warning: vlan %d with no nics\n", vlan->id);
if (has_nic && !has_host_dev)
fprintf(stderr,
"Warning: vlan %d is not connected to host network\n",
vlan->id);
}
QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
if (!vc->peer) {
fprintf(stderr, "Warning: %s %s has no peer\n",
vc->info->type == NET_CLIENT_TYPE_NIC ? "nic" : "netdev",
vc->name);
}
}
/* Check that all NICs requested via -net nic actually got created.
* NICs created via -device don't need to be checked here because
* they are always instantiated.
*/
for (i = 0; i < MAX_NICS; i++) {
NICInfo *nd = &nd_table[i];
if (nd->used && !nd->instantiated) {
fprintf(stderr, "Warning: requested NIC (%s, model %s) "
"was not created (not supported by this machine?)\n",
nd->name ? nd->name : "anonymous",
nd->model ? nd->model : "unspecified");
}
}
}
static int net_init_client(QemuOpts *opts, void *dummy)
{
Error *local_err = NULL;
net_client_init(opts, 0, &local_err);
if (error_is_set(&local_err)) {
qerror_report_err(local_err);
error_free(local_err);
return -1;
}
return 0;
}
static int net_init_netdev(QemuOpts *opts, void *dummy)
{
Error *local_err = NULL;
int ret;
ret = net_client_init(opts, 1, &local_err);
if (error_is_set(&local_err)) {
qerror_report_err(local_err);
error_free(local_err);
return -1;
}
return ret;
}
int net_init_clients(void)
{
QemuOptsList *net = qemu_find_opts("net");
if (default_net) {
/* if no clients, we use a default config */
qemu_opts_set(net, NULL, "type", "nic");
#ifdef CONFIG_SLIRP
qemu_opts_set(net, NULL, "type", "user");
#endif
}
QTAILQ_INIT(&vlans);
QTAILQ_INIT(&non_vlan_clients);
if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
return -1;
if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
return -1;
}
return 0;
}
int net_client_parse(QemuOptsList *opts_list, const char *optarg)
{
#if defined(CONFIG_SLIRP)
int ret;
if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
return ret;
}
#endif
if (!qemu_opts_parse(opts_list, optarg, 1)) {
return -1;
}
default_net = 0;
return 0;
}
/* From FreeBSD */
/* XXX: optimize */
unsigned compute_mcast_idx(const uint8_t *ep)
{
uint32_t crc;
int carry, i, j;
uint8_t b;
crc = 0xffffffff;
for (i = 0; i < 6; i++) {
b = *ep++;
for (j = 0; j < 8; j++) {
carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
crc <<= 1;
b >>= 1;
if (carry) {
crc = ((crc ^ POLYNOMIAL) | carry);
}
}
}
return crc >> 26;
}
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