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qemu/net/net.c
Yuri Benditovich d2abc563e4 net: purge queued rx packets on queue deletion 
https://bugzilla.redhat.com/show_bug.cgi?id=1829272
When deleting queue pair, purge pending RX packets if any.
Example of problematic flow:
1. Bring up q35 VM with tap (vhost off) and virtio-net or e1000e
2. Run ping flood to the VM NIC ( 1 ms interval)
3. Hot unplug the NIC device (device_del)
   During unplug process one or more packets come, the NIC
   can't receive, tap disables read_poll
4. Hot plug the device (device_add) with the same netdev
The tap stays with read_poll disabled and does not receive
any packets anymore (tap_send never triggered)

Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
2020-11-24 10:40:17 +08:00

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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 "qemu/osdep.h"
#include "net/net.h"
#include "clients.h"
#include "hub.h"
#include "hw/qdev-properties.h"
#include "net/slirp.h"
#include "net/eth.h"
#include "util.h"
#include "monitor/monitor.h"
#include "qemu/help_option.h"
#include "qapi/qapi-commands-net.h"
#include "qapi/qapi-visit-net.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qerror.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
#include "qemu/cutils.h"
#include "qemu/config-file.h"
#include "qemu/ctype.h"
#include "qemu/iov.h"
#include "qemu/qemu-print.h"
#include "qemu/main-loop.h"
#include "qemu/option.h"
#include "qapi/error.h"
#include "qapi/opts-visitor.h"
#include "sysemu/sysemu.h"
#include "sysemu/qtest.h"
#include "sysemu/runstate.h"
#include "sysemu/sysemu.h"
#include "net/filter.h"
#include "qapi/string-output-visitor.h"
/* Net bridge is currently not supported for W32. */
#if !defined(_WIN32)
# define CONFIG_NET_BRIDGE
#endif
static VMChangeStateEntry *net_change_state_entry;
static QTAILQ_HEAD(, NetClientState) net_clients;
/***********************************************************/
/* network device redirectors */
int parse_host_port(struct sockaddr_in *saddr, const char *str,
Error **errp)
{
gchar **substrings;
struct hostent *he;
const char *addr, *p, *r;
int port, ret = 0;
substrings = g_strsplit(str, ":", 2);
if (!substrings || !substrings[0] || !substrings[1]) {
error_setg(errp, "host address '%s' doesn't contain ':' "
"separating host from port", str);
ret = -1;
goto out;
}
addr = substrings[0];
p = substrings[1];
saddr->sin_family = AF_INET;
if (addr[0] == '\0') {
saddr->sin_addr.s_addr = 0;
} else {
if (qemu_isdigit(addr[0])) {
if (!inet_aton(addr, &saddr->sin_addr)) {
error_setg(errp, "host address '%s' is not a valid "
"IPv4 address", addr);
ret = -1;
goto out;
}
} else {
he = gethostbyname(addr);
if (he == NULL) {
error_setg(errp, "can't resolve host address '%s'", addr);
ret = -1;
goto out;
}
saddr->sin_addr = *(struct in_addr *)he->h_addr;
}
}
port = strtol(p, (char **)&r, 0);
if (r == p) {
error_setg(errp, "port number '%s' is invalid", p);
ret = -1;
goto out;
}
saddr->sin_port = htons(port);
out:
g_strfreev(substrings);
return ret;
}
char *qemu_mac_strdup_printf(const uint8_t *macaddr)
{
return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
macaddr[0], macaddr[1], macaddr[2],
macaddr[3], macaddr[4], macaddr[5]);
}
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]);
}
static int mac_table[256] = {0};
static void qemu_macaddr_set_used(MACAddr *macaddr)
{
int index;
for (index = 0x56; index < 0xFF; index++) {
if (macaddr->a[5] == index) {
mac_table[index]++;
}
}
}
static void qemu_macaddr_set_free(MACAddr *macaddr)
{
int index;
static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
return;
}
for (index = 0x56; index < 0xFF; index++) {
if (macaddr->a[5] == index) {
mac_table[index]--;
}
}
}
static int qemu_macaddr_get_free(void)
{
int index;
for (index = 0x56; index < 0xFF; index++) {
if (mac_table[index] == 0) {
return index;
}
}
return -1;
}
void qemu_macaddr_default_if_unset(MACAddr *macaddr)
{
static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
return;
} else {
qemu_macaddr_set_used(macaddr);
return;
}
}
macaddr->a[0] = 0x52;
macaddr->a[1] = 0x54;
macaddr->a[2] = 0x00;
macaddr->a[3] = 0x12;
macaddr->a[4] = 0x34;
macaddr->a[5] = qemu_macaddr_get_free();
qemu_macaddr_set_used(macaddr);
}
/**
* 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 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
void *opaque);
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(qemu_deliver_packet_iov, nc);
nc->destructor = destructor;
QTAILQ_INIT(&nc->filters);
}
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->peers.queues);
assert(info->type == NET_CLIENT_DRIVER_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;
}
NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
{
assert(nc != NULL);
NetClientState *ncs = nc + queue_index;
return ncs->peer;
}
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;
NetFilterState *nf, *next;
assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
/* 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_DRIVER_NIC,
MAX_QUEUE_NUM);
assert(queues != 0);
QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
object_unparent(OBJECT(nf));
}
/* If there is a peer NIC, delete and cleanup client, but do not free. */
if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_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;
}
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->peers.queues, 1);
qemu_macaddr_set_free(&nic->conf->macaddr);
for (i = 0; i < queues; i++) {
NetClientState *nc = qemu_get_subqueue(nic, i);
/* If this is a peer NIC and peer has already been deleted, free it now. */
if (nic->peer_deleted) {
qemu_free_net_client(nc->peer);
} else if (nc->peer) {
/* if there are RX packets pending, complete them */
qemu_purge_queued_packets(nc->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_DRIVER_NIC) {
if (nc->queue_index == 0) {
func(qemu_get_nic(nc), opaque);
}
}
}
}
bool qemu_has_ufo(NetClientState *nc)
{
if (!nc || !nc->info->has_ufo) {
return false;
}
return nc->info->has_ufo(nc);
}
bool qemu_has_vnet_hdr(NetClientState *nc)
{
if (!nc || !nc->info->has_vnet_hdr) {
return false;
}
return nc->info->has_vnet_hdr(nc);
}
bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
{
if (!nc || !nc->info->has_vnet_hdr_len) {
return false;
}
return nc->info->has_vnet_hdr_len(nc, len);
}
void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
{
if (!nc || !nc->info->using_vnet_hdr) {
return;
}
nc->info->using_vnet_hdr(nc, enable);
}
void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
int ecn, int ufo)
{
if (!nc || !nc->info->set_offload) {
return;
}
nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
}
void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
{
if (!nc || !nc->info->set_vnet_hdr_len) {
return;
}
nc->vnet_hdr_len = len;
nc->info->set_vnet_hdr_len(nc, len);
}
int qemu_set_vnet_le(NetClientState *nc, bool is_le)
{
#ifdef HOST_WORDS_BIGENDIAN
if (!nc || !nc->info->set_vnet_le) {
return -ENOSYS;
}
return nc->info->set_vnet_le(nc, is_le);
#else
return 0;
#endif
}
int qemu_set_vnet_be(NetClientState *nc, bool is_be)
{
#ifdef HOST_WORDS_BIGENDIAN
return 0;
#else
if (!nc || !nc->info->set_vnet_be) {
return -ENOSYS;
}
return nc->info->set_vnet_be(nc, is_be);
#endif
}
int qemu_can_send_packet(NetClientState *sender)
{
int vm_running = runstate_is_running();
if (!vm_running) {
return 0;
}
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;
}
static ssize_t filter_receive_iov(NetClientState *nc,
NetFilterDirection direction,
NetClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
NetPacketSent *sent_cb)
{
ssize_t ret = 0;
NetFilterState *nf = NULL;
if (direction == NET_FILTER_DIRECTION_TX) {
QTAILQ_FOREACH(nf, &nc->filters, next) {
ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
iovcnt, sent_cb);
if (ret) {
return ret;
}
}
} else {
QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
iovcnt, sent_cb);
if (ret) {
return ret;
}
}
}
return ret;
}
static ssize_t filter_receive(NetClientState *nc,
NetFilterDirection direction,
NetClientState *sender,
unsigned flags,
const uint8_t *data,
size_t size,
NetPacketSent *sent_cb)
{
struct iovec iov = {
.iov_base = (void *)data,
.iov_len = size
};
return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
}
void qemu_purge_queued_packets(NetClientState *nc)
{
if (!nc->peer) {
return;
}
qemu_net_queue_purge(nc->peer->incoming_queue, nc);
}
void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
{
nc->receive_disabled = 0;
if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_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();
} else if (purge) {
/* Unable to empty the queue, purge remaining packets */
qemu_net_queue_purge(nc->incoming_queue, nc->peer);
}
}
void qemu_flush_queued_packets(NetClientState *nc)
{
qemu_flush_or_purge_queued_packets(nc, false);
}
static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
unsigned flags,
const uint8_t *buf, int size,
NetPacketSent *sent_cb)
{
NetQueue *queue;
int ret;
#ifdef DEBUG_NET
printf("qemu_send_packet_async:\n");
qemu_hexdump(stdout, "net", buf, size);
#endif
if (sender->link_down || !sender->peer) {
return size;
}
/* Let filters handle the packet first */
ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
sender, flags, buf, size, sent_cb);
if (ret) {
return ret;
}
ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
sender, flags, buf, size, sent_cb);
if (ret) {
return ret;
}
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);
}
ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
{
return 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, unsigned flags)
{
uint8_t *buf = NULL;
uint8_t *buffer;
size_t offset;
ssize_t ret;
if (iovcnt == 1) {
buffer = iov[0].iov_base;
offset = iov[0].iov_len;
} else {
offset = iov_size(iov, iovcnt);
if (offset > NET_BUFSIZE) {
return -1;
}
buf = g_malloc(offset);
buffer = buf;
offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
}
if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
ret = nc->info->receive_raw(nc, buffer, offset);
} else {
ret = nc->info->receive(nc, buffer, offset);
}
g_free(buf);
return ret;
}
static 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 && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
ret = nc->info->receive_iov(nc, iov, iovcnt);
} else {
ret = nc_sendv_compat(nc, iov, iovcnt, flags);
}
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;
size_t size = iov_size(iov, iovcnt);
int ret;
if (size > NET_BUFSIZE) {
return size;
}
if (sender->link_down || !sender->peer) {
return size;
}
/* Let filters handle the packet first */
ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
if (ret) {
return ret;
}
ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
if (ret) {
return ret;
}
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_DRIVER_NIC)
continue;
if (!strcmp(nc->name, id)) {
return nc;
}
}
return NULL;
}
int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
NetClientDriver type, int max)
{
NetClientState *nc;
int ret = 0;
QTAILQ_FOREACH(nc, &net_clients, next) {
if (nc->info->type == type) {
continue;
}
if (!id || !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;
}
printf("Supported NIC models:\n");
for (i = 0 ; models[i]; i++) {
printf("%s\n", models[i]);
}
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 Netdev *netdev, const char *name,
NetClientState *peer, Error **errp)
{
int idx;
NICInfo *nd;
const NetLegacyNicOptions *nic;
assert(netdev->type == NET_CLIENT_DRIVER_NIC);
nic = &netdev->u.nic;
idx = nic_get_free_idx();
if (idx == -1 || nb_nics >= MAX_NICS) {
error_setg(errp, "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_setg(errp, "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_setg(errp, "invalid syntax for ethernet address");
return -1;
}
if (nic->has_macaddr &&
is_multicast_ether_addr(nd->macaddr.a)) {
error_setg(errp,
"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_setg(errp, "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_DRIVER__MAX])(
const Netdev *netdev,
const char *name,
NetClientState *peer, Error **errp) = {
[NET_CLIENT_DRIVER_NIC] = net_init_nic,
#ifdef CONFIG_SLIRP
[NET_CLIENT_DRIVER_USER] = net_init_slirp,
#endif
[NET_CLIENT_DRIVER_TAP] = net_init_tap,
[NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
#ifdef CONFIG_VDE
[NET_CLIENT_DRIVER_VDE] = net_init_vde,
#endif
#ifdef CONFIG_NETMAP
[NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
#endif
#ifdef CONFIG_NET_BRIDGE
[NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
#endif
[NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
#ifdef CONFIG_VHOST_NET_USER
[NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
#endif
#ifdef CONFIG_VHOST_NET_VDPA
[NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
#endif
#ifdef CONFIG_L2TPV3
[NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
#endif
};
static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
{
NetClientState *peer = NULL;
if (is_netdev) {
if (netdev->type == NET_CLIENT_DRIVER_NIC ||
!net_client_init_fun[netdev->type]) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
"a netdev backend type");
return -1;
}
} else {
if (netdev->type == NET_CLIENT_DRIVER_NONE) {
return 0; /* nothing to do */
}
if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
!net_client_init_fun[netdev->type]) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
"a net backend type (maybe it is not compiled "
"into this binary)");
return -1;
}
/* Do not add to a hub if it's a nic with a netdev= parameter. */
if (netdev->type != NET_CLIENT_DRIVER_NIC ||
!netdev->u.nic.has_netdev) {
peer = net_hub_add_port(0, NULL, NULL);
}
}
if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
/* FIXME drop when all init functions store an Error */
if (errp && !*errp) {
error_setg(errp, QERR_DEVICE_INIT_FAILED,
NetClientDriver_str(netdev->type));
}
return -1;
}
if (is_netdev) {
NetClientState *nc;
nc = qemu_find_netdev(netdev->id);
assert(nc);
nc->is_netdev = true;
}
return 0;
}
void show_netdevs(void)
{
int idx;
const char *available_netdevs[] = {
"socket",
"hubport",
"tap",
#ifdef CONFIG_SLIRP
"user",
#endif
#ifdef CONFIG_L2TPV3
"l2tpv3",
#endif
#ifdef CONFIG_VDE
"vde",
#endif
#ifdef CONFIG_NET_BRIDGE
"bridge",
#endif
#ifdef CONFIG_NETMAP
"netmap",
#endif
#ifdef CONFIG_POSIX
"vhost-user",
#endif
#ifdef CONFIG_VHOST_VDPA
"vhost-vdpa",
#endif
};
qemu_printf("Available netdev backend types:\n");
for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
qemu_printf("%s\n", available_netdevs[idx]);
}
}
static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
{
gchar **substrings = NULL;
Netdev *object = NULL;
int ret = -1;
Visitor *v = opts_visitor_new(opts);
/* Parse convenience option format ip6-net=fec0::0[/64] */
const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
if (ip6_net) {
char *prefix_addr;
unsigned long prefix_len = 64; /* Default 64bit prefix length. */
substrings = g_strsplit(ip6_net, "/", 2);
if (!substrings || !substrings[0]) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
"a valid IPv6 prefix");
goto out;
}
prefix_addr = substrings[0];
/* Handle user-specified prefix length. */
if (substrings[1] &&
qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
{
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"ipv6-prefixlen", "a number");
goto out;
}
qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
&error_abort);
qemu_opt_unset(opts, "ipv6-net");
}
/* Create an ID for -net if the user did not specify one */
if (!is_netdev && !qemu_opts_id(opts)) {
static int idx;
qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++));
}
if (visit_type_Netdev(v, NULL, &object, errp)) {
ret = net_client_init1(object, is_netdev, errp);
}
qapi_free_Netdev(object);
out:
g_strfreev(substrings);
visit_free(v);
return ret;
}
void netdev_add(QemuOpts *opts, Error **errp)
{
net_client_init(opts, true, errp);
}
void qmp_netdev_add(Netdev *netdev, Error **errp)
{
net_client_init1(netdev, true, errp);
}
void qmp_netdev_del(const char *id, Error **errp)
{
NetClientState *nc;
nc = qemu_find_netdev(id);
if (!nc) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", id);
return;
}
if (!nc->is_netdev) {
error_setg(errp, "Device '%s' is not a netdev", id);
return;
}
qemu_del_net_client(nc);
}
static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
{
char *str;
ObjectProperty *prop;
ObjectPropertyIterator iter;
Visitor *v;
/* generate info str */
object_property_iter_init(&iter, OBJECT(nf));
while ((prop = object_property_iter_next(&iter))) {
if (!strcmp(prop->name, "type")) {
continue;
}
v = string_output_visitor_new(false, &str);
object_property_get(OBJECT(nf), prop->name, v, NULL);
visit_complete(v, &str);
visit_free(v);
monitor_printf(mon, ",%s=%s", prop->name, str);
g_free(str);
}
monitor_printf(mon, "\n");
}
void print_net_client(Monitor *mon, NetClientState *nc)
{
NetFilterState *nf;
monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
nc->queue_index,
NetClientDriver_str(nc->info->type),
nc->info_str);
if (!QTAILQ_EMPTY(&nc->filters)) {
monitor_printf(mon, "filters:\n");
}
QTAILQ_FOREACH(nf, &nc->filters, next) {
monitor_printf(mon, " - %s: type=%s",
object_get_canonical_path_component(OBJECT(nf)),
object_get_typename(OBJECT(nf)));
netfilter_print_info(mon, nf);
}
}
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_DRIVER_NIC) {
if (has_name) {
error_setg(errp, "net client(%s) isn't a NIC", name);
return NULL;
}
continue;
}
/* only query information on queue 0 since the info is per nic,
* not per queue
*/
if (nc->queue_index != 0)
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);
return NULL;
}
if (has_name) {
break;
}
}
if (filter_list == NULL && has_name) {
error_setg(errp, "invalid net client name: %s", name);
}
return filter_list;
}
void hmp_info_network(Monitor *mon, const QDict *qdict)
{
NetClientState *nc, *peer;
NetClientDriver 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_DRIVER_NIC) {
print_net_client(mon, nc);
} /* else it's a netdev connected to a NIC, printed with the NIC */
if (peer && type == NET_CLIENT_DRIVER_NIC) {
monitor_printf(mon, " \\ ");
print_net_client(mon, peer);
}
}
}
void colo_notify_filters_event(int event, Error **errp)
{
NetClientState *nc;
NetFilterState *nf;
NetFilterClass *nfc = NULL;
Error *local_err = NULL;
QTAILQ_FOREACH(nc, &net_clients, next) {
QTAILQ_FOREACH(nf, &nc->filters, next) {
nfc = NETFILTER_GET_CLASS(OBJECT(nf));
nfc->handle_event(nf, event, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
}
}
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_DRIVER__MAX,
MAX_QUEUE_NUM);
if (queues == 0) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' 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 hubs 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_DRIVER_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);
}
}
}
static void net_vm_change_state_handler(void *opaque, int running,
RunState state)
{
NetClientState *nc;
NetClientState *tmp;
QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
if (running) {
/* Flush queued packets and wake up backends. */
if (nc->peer && qemu_can_send_packet(nc)) {
qemu_flush_queued_packets(nc->peer);
}
} else {
/* Complete all queued packets, to guarantee we don't modify
* state later when VM is not running.
*/
qemu_flush_or_purge_queued_packets(nc, true);
}
}
}
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_DRIVER_NIC) {
qemu_del_nic(qemu_get_nic(nc));
} else {
qemu_del_net_client(nc);
}
}
qemu_del_vm_change_state_handler(net_change_state_entry);
}
void net_check_clients(void)
{
NetClientState *nc;
int i;
net_hub_check_clients();
QTAILQ_FOREACH(nc, &net_clients, next) {
if (!nc->peer) {
warn_report("%s %s has no peer",
nc->info->type == NET_CLIENT_DRIVER_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) {
warn_report("requested NIC (%s, model %s) "
"was not created (not supported by this machine?)",
nd->name ? nd->name : "anonymous",
nd->model ? nd->model : "unspecified");
}
}
}
static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
{
return net_client_init(opts, false, errp);
}
static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
{
const char *type = qemu_opt_get(opts, "type");
if (type && is_help_option(type)) {
show_netdevs();
exit(0);
}
return net_client_init(opts, true, errp);
}
/* For the convenience "--nic" parameter */
static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
{
char *mac, *nd_id;
int idx, ret;
NICInfo *ni;
const char *type;
type = qemu_opt_get(opts, "type");
if (type && g_str_equal(type, "none")) {
return 0; /* Nothing to do, default_net is cleared in vl.c */
}
idx = nic_get_free_idx();
if (idx == -1 || nb_nics >= MAX_NICS) {
error_setg(errp, "no more on-board/default NIC slots available");
return -1;
}
if (!type) {
qemu_opt_set(opts, "type", "user", &error_abort);
}
ni = &nd_table[idx];
memset(ni, 0, sizeof(*ni));
ni->model = qemu_opt_get_del(opts, "model");
/* Create an ID if the user did not specify one */
nd_id = g_strdup(qemu_opts_id(opts));
if (!nd_id) {
nd_id = g_strdup_printf("__org.qemu.nic%i", idx);
qemu_opts_set_id(opts, nd_id);
}
/* Handle MAC address */
mac = qemu_opt_get_del(opts, "mac");
if (mac) {
ret = net_parse_macaddr(ni->macaddr.a, mac);
g_free(mac);
if (ret) {
error_setg(errp, "invalid syntax for ethernet address");
goto out;
}
if (is_multicast_ether_addr(ni->macaddr.a)) {
error_setg(errp, "NIC cannot have multicast MAC address");
ret = -1;
goto out;
}
}
qemu_macaddr_default_if_unset(&ni->macaddr);
ret = net_client_init(opts, true, errp);
if (ret == 0) {
ni->netdev = qemu_find_netdev(nd_id);
ni->used = true;
nb_nics++;
}
out:
g_free(nd_id);
return ret;
}
int net_init_clients(Error **errp)
{
net_change_state_entry =
qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
QTAILQ_INIT(&net_clients);
if (qemu_opts_foreach(qemu_find_opts("netdev"),
net_init_netdev, NULL, errp)) {
return -1;
}
if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
return -1;
}
if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
return -1;
}
return 0;
}
int net_client_parse(QemuOptsList *opts_list, const char *optarg)
{
if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
return -1;
}
return 0;
}
/* From FreeBSD */
/* XXX: optimize */
uint32_t net_crc32(const uint8_t *p, int len)
{
uint32_t crc;
int carry, i, j;
uint8_t b;
crc = 0xffffffff;
for (i = 0; i < len; i++) {
b = *p++;
for (j = 0; j < 8; j++) {
carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
crc <<= 1;
b >>= 1;
if (carry) {
crc = ((crc ^ POLYNOMIAL_BE) | carry);
}
}
}
return crc;
}
uint32_t net_crc32_le(const uint8_t *p, int len)
{
uint32_t crc;
int carry, i, j;
uint8_t b;
crc = 0xffffffff;
for (i = 0; i < len; i++) {
b = *p++;
for (j = 0; j < 8; j++) {
carry = (crc & 0x1) ^ (b & 0x01);
crc >>= 1;
b >>= 1;
if (carry) {
crc ^= POLYNOMIAL_LE;
}
}
}
return crc;
}
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_nic_opts = {
.name = "nic",
.implied_opt_name = "type",
.head = QTAILQ_HEAD_INITIALIZER(qemu_nic_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 */ }
},
};
void net_socket_rs_init(SocketReadState *rs,
SocketReadStateFinalize *finalize,
bool vnet_hdr)
{
rs->state = 0;
rs->vnet_hdr = vnet_hdr;
rs->index = 0;
rs->packet_len = 0;
rs->vnet_hdr_len = 0;
memset(rs->buf, 0, sizeof(rs->buf));
rs->finalize = finalize;
}
/*
* Returns
* 0: success
* -1: error occurs
*/
int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
{
unsigned int l;
while (size > 0) {
/* Reassemble a packet from the network.
* 0 = getting length.
* 1 = getting vnet header length.
* 2 = getting data.
*/
switch (rs->state) {
case 0:
l = 4 - rs->index;
if (l > size) {
l = size;
}
memcpy(rs->buf + rs->index, buf, l);
buf += l;
size -= l;
rs->index += l;
if (rs->index == 4) {
/* got length */
rs->packet_len = ntohl(*(uint32_t *)rs->buf);
rs->index = 0;
if (rs->vnet_hdr) {
rs->state = 1;
} else {
rs->state = 2;
rs->vnet_hdr_len = 0;
}
}
break;
case 1:
l = 4 - rs->index;
if (l > size) {
l = size;
}
memcpy(rs->buf + rs->index, buf, l);
buf += l;
size -= l;
rs->index += l;
if (rs->index == 4) {
/* got vnet header length */
rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
rs->index = 0;
rs->state = 2;
}
break;
case 2:
l = rs->packet_len - rs->index;
if (l > size) {
l = size;
}
if (rs->index + l <= sizeof(rs->buf)) {
memcpy(rs->buf + rs->index, buf, l);
} else {
fprintf(stderr, "serious error: oversized packet received,"
"connection terminated.\n");
rs->index = rs->state = 0;
return -1;
}
rs->index += l;
buf += l;
size -= l;
if (rs->index >= rs->packet_len) {
rs->index = 0;
rs->state = 0;
assert(rs->finalize);
rs->finalize(rs);
}
break;
}
}
assert(size == 0);
return 0;
}
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