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qemu/net/net.c
Markus Armbruster 84d18f065f Use error_is_set() only when necessary 
error_is_set(&var) is the same as var != NULL, but it takes
whole-program analysis to figure that out.  Unnecessarily hard for
optimizers, static checkers, and human readers.  Dumb it down to
obvious.

Gets rid of several dozen Coverity false positives.

Note that the obvious form is already used in many places.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-02-17 11:57:23 -05:00

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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 "config-host.h"
#include "net/net.h"
#include "clients.h"
#include "hub.h"
#include "net/slirp.h"
#include "net/eth.h"
#include "util.h"
#include "monitor/monitor.h"
#include "qemu-common.h"
#include "qemu/sockets.h"
#include "qemu/config-file.h"
#include "qmp-commands.h"
#include "hw/qdev.h"
#include "qemu/iov.h"
#include "qemu/main-loop.h"
#include "qapi-visit.h"
#include "qapi/opts-visitor.h"
#include "qapi/dealloc-visitor.h"
/* Net bridge is currently not supported for W32. */
#if !defined(_WIN32)
# define CONFIG_NET_BRIDGE
#endif
static QTAILQ_HEAD(, NetClientState) net_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(NetClientState *nc, uint8_t macaddr[6])
{
snprintf(nc->info_str, sizeof(nc->info_str),
"model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
nc->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++;
}
/**
* Generate a name for net client
*
* Only net clients created with the legacy -net option and NICs need this.
*/
static char *assign_name(NetClientState *nc1, const char *model)
{
NetClientState *nc;
int id = 0;
QTAILQ_FOREACH(nc, &net_clients, next) {
if (nc == nc1) {
continue;
}
if (strcmp(nc->model, model) == 0) {
id++;
}
}
return g_strdup_printf("%s.%d", model, id);
}
static void qemu_net_client_destructor(NetClientState *nc)
{
g_free(nc);
}
static void qemu_net_client_setup(NetClientState *nc,
NetClientInfo *info,
NetClientState *peer,
const char *model,
const char *name,
NetClientDestructor *destructor)
{
nc->info = info;
nc->model = g_strdup(model);
if (name) {
nc->name = g_strdup(name);
} else {
nc->name = assign_name(nc, model);
}
if (peer) {
assert(!peer->peer);
nc->peer = peer;
peer->peer = nc;
}
QTAILQ_INSERT_TAIL(&net_clients, nc, next);
nc->incoming_queue = qemu_new_net_queue(nc);
nc->destructor = destructor;
}
NetClientState *qemu_new_net_client(NetClientInfo *info,
NetClientState *peer,
const char *model,
const char *name)
{
NetClientState *nc;
assert(info->size >= sizeof(NetClientState));
nc = g_malloc0(info->size);
qemu_net_client_setup(nc, info, peer, model, name,
qemu_net_client_destructor);
return nc;
}
NICState *qemu_new_nic(NetClientInfo *info,
NICConf *conf,
const char *model,
const char *name,
void *opaque)
{
NetClientState **peers = conf->peers.ncs;
NICState *nic;
int i, queues = MAX(1, conf->queues);
assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
assert(info->size >= sizeof(NICState));
nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
nic->ncs = (void *)nic + info->size;
nic->conf = conf;
nic->opaque = opaque;
for (i = 0; i < queues; i++) {
qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
NULL);
nic->ncs[i].queue_index = i;
}
return nic;
}
NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
{
return nic->ncs + queue_index;
}
NetClientState *qemu_get_queue(NICState *nic)
{
return qemu_get_subqueue(nic, 0);
}
NICState *qemu_get_nic(NetClientState *nc)
{
NetClientState *nc0 = nc - nc->queue_index;
return (NICState *)((void *)nc0 - nc->info->size);
}
void *qemu_get_nic_opaque(NetClientState *nc)
{
NICState *nic = qemu_get_nic(nc);
return nic->opaque;
}
static void qemu_cleanup_net_client(NetClientState *nc)
{
QTAILQ_REMOVE(&net_clients, nc, next);
if (nc->info->cleanup) {
nc->info->cleanup(nc);
}
}
static void qemu_free_net_client(NetClientState *nc)
{
if (nc->incoming_queue) {
qemu_del_net_queue(nc->incoming_queue);
}
if (nc->peer) {
nc->peer->peer = NULL;
}
g_free(nc->name);
g_free(nc->model);
if (nc->destructor) {
nc->destructor(nc);
}
}
void qemu_del_net_client(NetClientState *nc)
{
NetClientState *ncs[MAX_QUEUE_NUM];
int queues, i;
/* If the NetClientState belongs to a multiqueue backend, we will change all
* other NetClientStates also.
*/
queues = qemu_find_net_clients_except(nc->name, ncs,
NET_CLIENT_OPTIONS_KIND_NIC,
MAX_QUEUE_NUM);
assert(queues != 0);
/* If there is a peer NIC, delete and cleanup client, but do not free. */
if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
NICState *nic = qemu_get_nic(nc->peer);
if (nic->peer_deleted) {
return;
}
nic->peer_deleted = true;
for (i = 0; i < queues; i++) {
ncs[i]->peer->link_down = true;
}
if (nc->peer->info->link_status_changed) {
nc->peer->info->link_status_changed(nc->peer);
}
for (i = 0; i < queues; i++) {
qemu_cleanup_net_client(ncs[i]);
}
return;
}
assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
for (i = 0; i < queues; i++) {
qemu_cleanup_net_client(ncs[i]);
qemu_free_net_client(ncs[i]);
}
}
void qemu_del_nic(NICState *nic)
{
int i, queues = MAX(nic->conf->queues, 1);
/* If this is a peer NIC and peer has already been deleted, free it now. */
if (nic->peer_deleted) {
for (i = 0; i < queues; i++) {
qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
}
}
for (i = queues - 1; i >= 0; i--) {
NetClientState *nc = qemu_get_subqueue(nic, i);
qemu_cleanup_net_client(nc);
qemu_free_net_client(nc);
}
g_free(nic);
}
void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
{
NetClientState *nc;
QTAILQ_FOREACH(nc, &net_clients, next) {
if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
if (nc->queue_index == 0) {
func(qemu_get_nic(nc), opaque);
}
}
}
}
int qemu_can_send_packet(NetClientState *sender)
{
if (!sender->peer) {
return 1;
}
if (sender->peer->receive_disabled) {
return 0;
} else if (sender->peer->info->can_receive &&
!sender->peer->info->can_receive(sender->peer)) {
return 0;
}
return 1;
}
ssize_t qemu_deliver_packet(NetClientState *sender,
unsigned flags,
const uint8_t *data,
size_t size,
void *opaque)
{
NetClientState *nc = opaque;
ssize_t ret;
if (nc->link_down) {
return size;
}
if (nc->receive_disabled) {
return 0;
}
if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
ret = nc->info->receive_raw(nc, data, size);
} else {
ret = nc->info->receive(nc, data, size);
}
if (ret == 0) {
nc->receive_disabled = 1;
};
return ret;
}
void qemu_purge_queued_packets(NetClientState *nc)
{
if (!nc->peer) {
return;
}
qemu_net_queue_purge(nc->peer->incoming_queue, nc);
}
void qemu_flush_queued_packets(NetClientState *nc)
{
nc->receive_disabled = 0;
if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
if (net_hub_flush(nc->peer)) {
qemu_notify_event();
}
}
if (qemu_net_queue_flush(nc->incoming_queue)) {
/* We emptied the queue successfully, signal to the IO thread to repoll
* the file descriptor (for tap, for example).
*/
qemu_notify_event();
}
}
static ssize_t qemu_send_packet_async_with_flags(NetClientState *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) {
return size;
}
queue = sender->peer->incoming_queue;
return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
}
ssize_t qemu_send_packet_async(NetClientState *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(NetClientState *nc, const uint8_t *buf, int size)
{
qemu_send_packet_async(nc, buf, size, NULL);
}
ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
{
return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
buf, size, NULL);
}
static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
int iovcnt)
{
uint8_t buffer[NET_BUFSIZE];
size_t offset;
offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
return nc->info->receive(nc, buffer, offset);
}
ssize_t qemu_deliver_packet_iov(NetClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
void *opaque)
{
NetClientState *nc = opaque;
int ret;
if (nc->link_down) {
return iov_size(iov, iovcnt);
}
if (nc->receive_disabled) {
return 0;
}
if (nc->info->receive_iov) {
ret = nc->info->receive_iov(nc, iov, iovcnt);
} else {
ret = nc_sendv_compat(nc, iov, iovcnt);
}
if (ret == 0) {
nc->receive_disabled = 1;
}
return ret;
}
ssize_t qemu_sendv_packet_async(NetClientState *sender,
const struct iovec *iov, int iovcnt,
NetPacketSent *sent_cb)
{
NetQueue *queue;
if (sender->link_down || !sender->peer) {
return iov_size(iov, iovcnt);
}
queue = sender->peer->incoming_queue;
return qemu_net_queue_send_iov(queue, sender,
QEMU_NET_PACKET_FLAG_NONE,
iov, iovcnt, sent_cb);
}
ssize_t
qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
{
return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
}
NetClientState *qemu_find_netdev(const char *id)
{
NetClientState *nc;
QTAILQ_FOREACH(nc, &net_clients, next) {
if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
continue;
if (!strcmp(nc->name, id)) {
return nc;
}
}
return NULL;
}
int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
NetClientOptionsKind type, int max)
{
NetClientState *nc;
int ret = 0;
QTAILQ_FOREACH(nc, &net_clients, next) {
if (nc->info->type == type) {
continue;
}
if (!strcmp(nc->name, id)) {
if (ret < max) {
ncs[ret] = nc;
}
ret++;
}
}
return ret;
}
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 || !is_help_option(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;
}
static int net_init_nic(const NetClientOptions *opts, const char *name,
NetClientState *peer)
{
int idx;
NICInfo *nd;
const NetLegacyNicOptions *nic;
assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
nic = opts->nic;
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 (nic->has_netdev) {
nd->netdev = qemu_find_netdev(nic->netdev);
if (!nd->netdev) {
error_report("netdev '%s' not found", nic->netdev);
return -1;
}
} else {
assert(peer);
nd->netdev = peer;
}
nd->name = g_strdup(name);
if (nic->has_model) {
nd->model = g_strdup(nic->model);
}
if (nic->has_addr) {
nd->devaddr = g_strdup(nic->addr);
}
if (nic->has_macaddr &&
net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
error_report("invalid syntax for ethernet address");
return -1;
}
if (nic->has_macaddr &&
is_multicast_ether_addr(nd->macaddr.a)) {
error_report("NIC cannot have multicast MAC address (odd 1st byte)");
return -1;
}
qemu_macaddr_default_if_unset(&nd->macaddr);
if (nic->has_vectors) {
if (nic->vectors > 0x7ffffff) {
error_report("invalid # of vectors: %"PRIu32, nic->vectors);
return -1;
}
nd->nvectors = nic->vectors;
} else {
nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
}
nd->used = 1;
nb_nics++;
return idx;
}
static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
const NetClientOptions *opts,
const char *name,
NetClientState *peer) = {
[NET_CLIENT_OPTIONS_KIND_NIC] = net_init_nic,
#ifdef CONFIG_SLIRP
[NET_CLIENT_OPTIONS_KIND_USER] = net_init_slirp,
#endif
[NET_CLIENT_OPTIONS_KIND_TAP] = net_init_tap,
[NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket,
#ifdef CONFIG_VDE
[NET_CLIENT_OPTIONS_KIND_VDE] = net_init_vde,
#endif
#ifdef CONFIG_NETMAP
[NET_CLIENT_OPTIONS_KIND_NETMAP] = net_init_netmap,
#endif
[NET_CLIENT_OPTIONS_KIND_DUMP] = net_init_dump,
#ifdef CONFIG_NET_BRIDGE
[NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge,
#endif
[NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport,
};
static int net_client_init1(const void *object, int is_netdev, Error **errp)
{
union {
const Netdev *netdev;
const NetLegacy *net;
} u;
const NetClientOptions *opts;
const char *name;
if (is_netdev) {
u.netdev = object;
opts = u.netdev->opts;
name = u.netdev->id;
switch (opts->kind) {
#ifdef CONFIG_SLIRP
case NET_CLIENT_OPTIONS_KIND_USER:
#endif
case NET_CLIENT_OPTIONS_KIND_TAP:
case NET_CLIENT_OPTIONS_KIND_SOCKET:
#ifdef CONFIG_VDE
case NET_CLIENT_OPTIONS_KIND_VDE:
#endif
#ifdef CONFIG_NETMAP
case NET_CLIENT_OPTIONS_KIND_NETMAP:
#endif
#ifdef CONFIG_NET_BRIDGE
case NET_CLIENT_OPTIONS_KIND_BRIDGE:
#endif
case NET_CLIENT_OPTIONS_KIND_HUBPORT:
break;
default:
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
"a netdev backend type");
return -1;
}
} else {
u.net = object;
opts = u.net->opts;
/* missing optional values have been initialized to "all bits zero" */
name = u.net->has_id ? u.net->id : u.net->name;
}
if (net_client_init_fun[opts->kind]) {
NetClientState *peer = NULL;
/* Do not add to a vlan if it's a -netdev or a nic with a netdev=
* parameter. */
if (!is_netdev &&
(opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
!opts->nic->has_netdev)) {
peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
}
if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
/* TODO push error reporting into init() methods */
error_set(errp, QERR_DEVICE_INIT_FAILED,
NetClientOptionsKind_lookup[opts->kind]);
return -1;
}
}
return 0;
}
static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
{
if (is_netdev) {
visit_type_Netdev(v, (Netdev **)object, NULL, errp);
} else {
visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
}
}
int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
{
void *object = NULL;
Error *err = NULL;
int ret = -1;
{
OptsVisitor *ov = opts_visitor_new(opts);
net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
opts_visitor_cleanup(ov);
}
if (!err) {
ret = net_client_init1(object, is_netdev, &err);
}
if (object) {
QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
qapi_dealloc_visitor_cleanup(dv);
}
error_propagate(errp, err);
return ret;
}
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 < ARRAY_SIZE(valid_param_list); 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 (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)
{
NetClientState *nc;
int vlan_id = qdict_get_int(qdict, "vlan_id");
const char *device = qdict_get_str(qdict, "device");
nc = net_hub_find_client_by_name(vlan_id, device);
if (!nc) {
return;
}
if (!net_host_check_device(nc->model)) {
monitor_printf(mon, "invalid host network device %s\n", device);
return;
}
qemu_del_net_client(nc);
}
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 (local_err) {
goto exit_err;
}
opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
if (local_err) {
goto exit_err;
}
netdev_add(opts, &local_err);
if (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)
{
NetClientState *nc;
QemuOpts *opts;
nc = qemu_find_netdev(id);
if (!nc) {
error_set(errp, QERR_DEVICE_NOT_FOUND, id);
return;
}
opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
if (!opts) {
error_setg(errp, "Device '%s' is not a netdev", id);
return;
}
qemu_del_net_client(nc);
qemu_opts_del(opts);
}
void print_net_client(Monitor *mon, NetClientState *nc)
{
monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
nc->queue_index,
NetClientOptionsKind_lookup[nc->info->type],
nc->info_str);
}
RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
Error **errp)
{
NetClientState *nc;
RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
QTAILQ_FOREACH(nc, &net_clients, next) {
RxFilterInfoList *entry;
RxFilterInfo *info;
if (has_name && strcmp(nc->name, name) != 0) {
continue;
}
/* only query rx-filter information of NIC */
if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
if (has_name) {
error_setg(errp, "net client(%s) isn't a NIC", name);
break;
}
continue;
}
if (nc->info->query_rx_filter) {
info = nc->info->query_rx_filter(nc);
entry = g_malloc0(sizeof(*entry));
entry->value = info;
if (!filter_list) {
filter_list = entry;
} else {
last_entry->next = entry;
}
last_entry = entry;
} else if (has_name) {
error_setg(errp, "net client(%s) doesn't support"
" rx-filter querying", name);
break;
}
}
if (filter_list == NULL && !error_is_set(errp) && has_name) {
error_setg(errp, "invalid net client name: %s", name);
}
return filter_list;
}
void do_info_network(Monitor *mon, const QDict *qdict)
{
NetClientState *nc, *peer;
NetClientOptionsKind type;
net_hub_info(mon);
QTAILQ_FOREACH(nc, &net_clients, next) {
peer = nc->peer;
type = nc->info->type;
/* Skip if already printed in hub info */
if (net_hub_id_for_client(nc, NULL) == 0) {
continue;
}
if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
print_net_client(mon, nc);
} /* else it's a netdev connected to a NIC, printed with the NIC */
if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
monitor_printf(mon, " \\ ");
print_net_client(mon, peer);
}
}
}
void qmp_set_link(const char *name, bool up, Error **errp)
{
NetClientState *ncs[MAX_QUEUE_NUM];
NetClientState *nc;
int queues, i;
queues = qemu_find_net_clients_except(name, ncs,
NET_CLIENT_OPTIONS_KIND_MAX,
MAX_QUEUE_NUM);
if (queues == 0) {
error_set(errp, QERR_DEVICE_NOT_FOUND, name);
return;
}
nc = ncs[0];
for (i = 0; i < queues; i++) {
ncs[i]->link_down = !up;
}
if (nc->info->link_status_changed) {
nc->info->link_status_changed(nc);
}
if (nc->peer) {
/* Change peer link only if the peer is NIC and then notify peer.
* If the peer is a HUBPORT or a backend, we do not change the
* link status.
*
* This behavior 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 (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
for (i = 0; i < queues; i++) {
ncs[i]->peer->link_down = !up;
}
}
if (nc->peer->info->link_status_changed) {
nc->peer->info->link_status_changed(nc->peer);
}
}
}
void net_cleanup(void)
{
NetClientState *nc;
/* We may del multiple entries during qemu_del_net_client(),
* so QTAILQ_FOREACH_SAFE() is also not safe here.
*/
while (!QTAILQ_EMPTY(&net_clients)) {
nc = QTAILQ_FIRST(&net_clients);
if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
qemu_del_nic(qemu_get_nic(nc));
} else {
qemu_del_net_client(nc);
}
}
}
void net_check_clients(void)
{
NetClientState *nc;
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;
}
net_hub_check_clients();
QTAILQ_FOREACH(nc, &net_clients, next) {
if (!nc->peer) {
fprintf(stderr, "Warning: %s %s has no peer\n",
nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
"nic" : "netdev", nc->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 (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 (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(&net_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;
}
QemuOptsList qemu_netdev_opts = {
.name = "netdev",
.implied_opt_name = "type",
.head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
.desc = {
/*
* no elements => accept any params
* validation will happen later
*/
{ /* end of list */ }
},
};
QemuOptsList qemu_net_opts = {
.name = "net",
.implied_opt_name = "type",
.head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
.desc = {
/*
* no elements => accept any params
* validation will happen later
*/
{ /* end of list */ }
},
};
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