1021 lines
28 KiB
C
1021 lines
28 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2009 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "tap_int.h"
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include "net/net.h"
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#include "clients.h"
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#include "monitor/monitor.h"
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#include "sysemu/sysemu.h"
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#include "qapi/error.h"
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#include "qemu-common.h"
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#include "qemu/cutils.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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#include "qemu/sockets.h"
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#include "net/tap.h"
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#include "net/vhost_net.h"
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typedef struct TAPState {
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NetClientState nc;
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int fd;
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char down_script[1024];
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char down_script_arg[128];
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uint8_t buf[NET_BUFSIZE];
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bool read_poll;
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bool write_poll;
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bool using_vnet_hdr;
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bool has_ufo;
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bool enabled;
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VHostNetState *vhost_net;
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unsigned host_vnet_hdr_len;
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Notifier exit;
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} TAPState;
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static void launch_script(const char *setup_script, const char *ifname,
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int fd, Error **errp);
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static void tap_send(void *opaque);
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static void tap_writable(void *opaque);
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static void tap_update_fd_handler(TAPState *s)
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{
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qemu_set_fd_handler(s->fd,
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s->read_poll && s->enabled ? tap_send : NULL,
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s->write_poll && s->enabled ? tap_writable : NULL,
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s);
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}
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static void tap_read_poll(TAPState *s, bool enable)
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{
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s->read_poll = enable;
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tap_update_fd_handler(s);
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}
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static void tap_write_poll(TAPState *s, bool enable)
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{
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s->write_poll = enable;
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tap_update_fd_handler(s);
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}
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static void tap_writable(void *opaque)
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{
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TAPState *s = opaque;
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tap_write_poll(s, false);
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qemu_flush_queued_packets(&s->nc);
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}
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static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt)
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{
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ssize_t len;
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do {
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len = writev(s->fd, iov, iovcnt);
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} while (len == -1 && errno == EINTR);
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if (len == -1 && errno == EAGAIN) {
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tap_write_poll(s, true);
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return 0;
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}
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return len;
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}
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static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov,
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int iovcnt)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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const struct iovec *iovp = iov;
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struct iovec iov_copy[iovcnt + 1];
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struct virtio_net_hdr_mrg_rxbuf hdr = { };
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if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
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iov_copy[0].iov_base = &hdr;
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iov_copy[0].iov_len = s->host_vnet_hdr_len;
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memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov));
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iovp = iov_copy;
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iovcnt++;
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}
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return tap_write_packet(s, iovp, iovcnt);
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}
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static ssize_t tap_receive_raw(NetClientState *nc, const uint8_t *buf, size_t size)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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struct iovec iov[2];
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int iovcnt = 0;
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struct virtio_net_hdr_mrg_rxbuf hdr = { };
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if (s->host_vnet_hdr_len) {
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iov[iovcnt].iov_base = &hdr;
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iov[iovcnt].iov_len = s->host_vnet_hdr_len;
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iovcnt++;
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}
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iov[iovcnt].iov_base = (char *)buf;
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iov[iovcnt].iov_len = size;
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iovcnt++;
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return tap_write_packet(s, iov, iovcnt);
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}
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static ssize_t tap_receive(NetClientState *nc, const uint8_t *buf, size_t size)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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struct iovec iov[1];
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if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
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return tap_receive_raw(nc, buf, size);
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}
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iov[0].iov_base = (char *)buf;
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iov[0].iov_len = size;
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return tap_write_packet(s, iov, 1);
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}
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#ifndef __sun__
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ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
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{
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return read(tapfd, buf, maxlen);
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}
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#endif
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static void tap_send_completed(NetClientState *nc, ssize_t len)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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tap_read_poll(s, true);
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}
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static void tap_send(void *opaque)
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{
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TAPState *s = opaque;
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int size;
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int packets = 0;
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while (true) {
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uint8_t *buf = s->buf;
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size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
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if (size <= 0) {
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break;
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}
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if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
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buf += s->host_vnet_hdr_len;
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size -= s->host_vnet_hdr_len;
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}
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size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
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if (size == 0) {
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tap_read_poll(s, false);
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break;
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} else if (size < 0) {
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break;
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}
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/*
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* When the host keeps receiving more packets while tap_send() is
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* running we can hog the QEMU global mutex. Limit the number of
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* packets that are processed per tap_send() callback to prevent
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* stalling the guest.
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*/
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packets++;
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if (packets >= 50) {
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break;
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}
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}
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}
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static bool tap_has_ufo(NetClientState *nc)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
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return s->has_ufo;
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}
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static bool tap_has_vnet_hdr(NetClientState *nc)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
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return !!s->host_vnet_hdr_len;
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}
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static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
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return !!tap_probe_vnet_hdr_len(s->fd, len);
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}
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static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
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assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) ||
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len == sizeof(struct virtio_net_hdr) ||
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len == sizeof(struct virtio_net_hdr_v1_hash));
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tap_fd_set_vnet_hdr_len(s->fd, len);
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s->host_vnet_hdr_len = len;
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}
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static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
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assert(!!s->host_vnet_hdr_len == using_vnet_hdr);
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s->using_vnet_hdr = using_vnet_hdr;
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}
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static int tap_set_vnet_le(NetClientState *nc, bool is_le)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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return tap_fd_set_vnet_le(s->fd, is_le);
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}
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static int tap_set_vnet_be(NetClientState *nc, bool is_be)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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return tap_fd_set_vnet_be(s->fd, is_be);
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}
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static void tap_set_offload(NetClientState *nc, int csum, int tso4,
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int tso6, int ecn, int ufo)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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if (s->fd < 0) {
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return;
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}
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tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
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}
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static void tap_exit_notify(Notifier *notifier, void *data)
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{
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TAPState *s = container_of(notifier, TAPState, exit);
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Error *err = NULL;
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if (s->down_script[0]) {
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launch_script(s->down_script, s->down_script_arg, s->fd, &err);
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if (err) {
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error_report_err(err);
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}
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}
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}
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static void tap_cleanup(NetClientState *nc)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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if (s->vhost_net) {
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vhost_net_cleanup(s->vhost_net);
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g_free(s->vhost_net);
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s->vhost_net = NULL;
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}
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qemu_purge_queued_packets(nc);
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tap_exit_notify(&s->exit, NULL);
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qemu_remove_exit_notifier(&s->exit);
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tap_read_poll(s, false);
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tap_write_poll(s, false);
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close(s->fd);
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s->fd = -1;
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}
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static void tap_poll(NetClientState *nc, bool enable)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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tap_read_poll(s, enable);
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tap_write_poll(s, enable);
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}
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int tap_get_fd(NetClientState *nc)
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{
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TAPState *s = DO_UPCAST(TAPState, nc, nc);
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assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
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return s->fd;
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}
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/* fd support */
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static NetClientInfo net_tap_info = {
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.type = NET_CLIENT_DRIVER_TAP,
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.size = sizeof(TAPState),
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.receive = tap_receive,
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.receive_raw = tap_receive_raw,
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.receive_iov = tap_receive_iov,
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.poll = tap_poll,
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.cleanup = tap_cleanup,
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.has_ufo = tap_has_ufo,
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.has_vnet_hdr = tap_has_vnet_hdr,
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.has_vnet_hdr_len = tap_has_vnet_hdr_len,
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.using_vnet_hdr = tap_using_vnet_hdr,
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.set_offload = tap_set_offload,
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.set_vnet_hdr_len = tap_set_vnet_hdr_len,
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.set_vnet_le = tap_set_vnet_le,
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.set_vnet_be = tap_set_vnet_be,
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};
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static TAPState *net_tap_fd_init(NetClientState *peer,
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const char *model,
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const char *name,
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int fd,
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int vnet_hdr)
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{
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NetClientState *nc;
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TAPState *s;
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nc = qemu_new_net_client(&net_tap_info, peer, model, name);
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s = DO_UPCAST(TAPState, nc, nc);
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s->fd = fd;
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s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
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s->using_vnet_hdr = false;
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s->has_ufo = tap_probe_has_ufo(s->fd);
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s->enabled = true;
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tap_set_offload(&s->nc, 0, 0, 0, 0, 0);
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/*
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* Make sure host header length is set correctly in tap:
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* it might have been modified by another instance of qemu.
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*/
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if (tap_probe_vnet_hdr_len(s->fd, s->host_vnet_hdr_len)) {
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tap_fd_set_vnet_hdr_len(s->fd, s->host_vnet_hdr_len);
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}
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tap_read_poll(s, true);
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s->vhost_net = NULL;
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s->exit.notify = tap_exit_notify;
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qemu_add_exit_notifier(&s->exit);
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return s;
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}
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static void launch_script(const char *setup_script, const char *ifname,
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int fd, Error **errp)
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{
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int pid, status;
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char *args[3];
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char **parg;
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/* try to launch network script */
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pid = fork();
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if (pid < 0) {
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error_setg_errno(errp, errno, "could not launch network script %s",
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setup_script);
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return;
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}
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if (pid == 0) {
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int open_max = sysconf(_SC_OPEN_MAX), i;
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for (i = 3; i < open_max; i++) {
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if (i != fd) {
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close(i);
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}
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}
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parg = args;
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*parg++ = (char *)setup_script;
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*parg++ = (char *)ifname;
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*parg = NULL;
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execv(setup_script, args);
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_exit(1);
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} else {
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while (waitpid(pid, &status, 0) != pid) {
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/* loop */
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}
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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return;
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}
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error_setg(errp, "network script %s failed with status %d",
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setup_script, status);
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}
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}
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static int recv_fd(int c)
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{
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int fd;
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uint8_t msgbuf[CMSG_SPACE(sizeof(fd))];
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struct msghdr msg = {
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.msg_control = msgbuf,
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.msg_controllen = sizeof(msgbuf),
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};
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struct cmsghdr *cmsg;
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struct iovec iov;
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uint8_t req[1];
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ssize_t len;
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
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msg.msg_controllen = cmsg->cmsg_len;
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iov.iov_base = req;
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iov.iov_len = sizeof(req);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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len = recvmsg(c, &msg, 0);
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if (len > 0) {
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memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
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return fd;
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}
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return len;
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}
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static int net_bridge_run_helper(const char *helper, const char *bridge,
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Error **errp)
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{
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sigset_t oldmask, mask;
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int pid, status;
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char *args[5];
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char **parg;
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int sv[2];
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sigemptyset(&mask);
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sigaddset(&mask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &mask, &oldmask);
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if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) {
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error_setg_errno(errp, errno, "socketpair() failed");
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return -1;
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}
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/* try to launch bridge helper */
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pid = fork();
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if (pid < 0) {
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error_setg_errno(errp, errno, "Can't fork bridge helper");
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return -1;
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}
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if (pid == 0) {
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int open_max = sysconf(_SC_OPEN_MAX), i;
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char *fd_buf = NULL;
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char *br_buf = NULL;
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char *helper_cmd = NULL;
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for (i = 3; i < open_max; i++) {
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if (i != sv[1]) {
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close(i);
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}
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}
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fd_buf = g_strdup_printf("%s%d", "--fd=", sv[1]);
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if (strrchr(helper, ' ') || strrchr(helper, '\t')) {
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/* assume helper is a command */
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if (strstr(helper, "--br=") == NULL) {
|
|
br_buf = g_strdup_printf("%s%s", "--br=", bridge);
|
|
}
|
|
|
|
helper_cmd = g_strdup_printf("%s %s %s %s", helper,
|
|
"--use-vnet", fd_buf, br_buf ? br_buf : "");
|
|
|
|
parg = args;
|
|
*parg++ = (char *)"sh";
|
|
*parg++ = (char *)"-c";
|
|
*parg++ = helper_cmd;
|
|
*parg++ = NULL;
|
|
|
|
execv("/bin/sh", args);
|
|
g_free(helper_cmd);
|
|
} else {
|
|
/* assume helper is just the executable path name */
|
|
|
|
br_buf = g_strdup_printf("%s%s", "--br=", bridge);
|
|
|
|
parg = args;
|
|
*parg++ = (char *)helper;
|
|
*parg++ = (char *)"--use-vnet";
|
|
*parg++ = fd_buf;
|
|
*parg++ = br_buf;
|
|
*parg++ = NULL;
|
|
|
|
execv(helper, args);
|
|
}
|
|
g_free(fd_buf);
|
|
g_free(br_buf);
|
|
_exit(1);
|
|
|
|
} else {
|
|
int fd;
|
|
int saved_errno;
|
|
|
|
close(sv[1]);
|
|
|
|
do {
|
|
fd = recv_fd(sv[0]);
|
|
} while (fd == -1 && errno == EINTR);
|
|
saved_errno = errno;
|
|
|
|
close(sv[0]);
|
|
|
|
while (waitpid(pid, &status, 0) != pid) {
|
|
/* loop */
|
|
}
|
|
sigprocmask(SIG_SETMASK, &oldmask, NULL);
|
|
if (fd < 0) {
|
|
error_setg_errno(errp, saved_errno,
|
|
"failed to recv file descriptor");
|
|
return -1;
|
|
}
|
|
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
|
|
error_setg(errp, "bridge helper failed");
|
|
return -1;
|
|
}
|
|
return fd;
|
|
}
|
|
}
|
|
|
|
int net_init_bridge(const Netdev *netdev, const char *name,
|
|
NetClientState *peer, Error **errp)
|
|
{
|
|
const NetdevBridgeOptions *bridge;
|
|
const char *helper, *br;
|
|
TAPState *s;
|
|
int fd, vnet_hdr;
|
|
|
|
assert(netdev->type == NET_CLIENT_DRIVER_BRIDGE);
|
|
bridge = &netdev->u.bridge;
|
|
|
|
helper = bridge->has_helper ? bridge->helper : DEFAULT_BRIDGE_HELPER;
|
|
br = bridge->has_br ? bridge->br : DEFAULT_BRIDGE_INTERFACE;
|
|
|
|
fd = net_bridge_run_helper(helper, br, errp);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
qemu_set_nonblock(fd);
|
|
vnet_hdr = tap_probe_vnet_hdr(fd, errp);
|
|
if (vnet_hdr < 0) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
s = net_tap_fd_init(peer, "bridge", name, fd, vnet_hdr);
|
|
|
|
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s,br=%s", helper,
|
|
br);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr,
|
|
const char *setup_script, char *ifname,
|
|
size_t ifname_sz, int mq_required, Error **errp)
|
|
{
|
|
Error *err = NULL;
|
|
int fd, vnet_hdr_required;
|
|
|
|
if (tap->has_vnet_hdr) {
|
|
*vnet_hdr = tap->vnet_hdr;
|
|
vnet_hdr_required = *vnet_hdr;
|
|
} else {
|
|
*vnet_hdr = 1;
|
|
vnet_hdr_required = 0;
|
|
}
|
|
|
|
TFR(fd = tap_open(ifname, ifname_sz, vnet_hdr, vnet_hdr_required,
|
|
mq_required, errp));
|
|
if (fd < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (setup_script &&
|
|
setup_script[0] != '\0' &&
|
|
strcmp(setup_script, "no") != 0) {
|
|
launch_script(setup_script, ifname, fd, &err);
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
#define MAX_TAP_QUEUES 1024
|
|
|
|
static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
|
|
const char *model, const char *name,
|
|
const char *ifname, const char *script,
|
|
const char *downscript, const char *vhostfdname,
|
|
int vnet_hdr, int fd, Error **errp)
|
|
{
|
|
Error *err = NULL;
|
|
TAPState *s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
|
|
int vhostfd;
|
|
|
|
tap_set_sndbuf(s->fd, tap, &err);
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
|
|
if (tap->has_fd || tap->has_fds) {
|
|
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd);
|
|
} else if (tap->has_helper) {
|
|
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s",
|
|
tap->helper);
|
|
} else {
|
|
snprintf(s->nc.info_str, sizeof(s->nc.info_str),
|
|
"ifname=%s,script=%s,downscript=%s", ifname, script,
|
|
downscript);
|
|
|
|
if (strcmp(downscript, "no") != 0) {
|
|
snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
|
|
snprintf(s->down_script_arg, sizeof(s->down_script_arg),
|
|
"%s", ifname);
|
|
}
|
|
}
|
|
|
|
if (tap->has_vhost ? tap->vhost :
|
|
vhostfdname || (tap->has_vhostforce && tap->vhostforce)) {
|
|
VhostNetOptions options;
|
|
|
|
options.backend_type = VHOST_BACKEND_TYPE_KERNEL;
|
|
options.net_backend = &s->nc;
|
|
if (tap->has_poll_us) {
|
|
options.busyloop_timeout = tap->poll_us;
|
|
} else {
|
|
options.busyloop_timeout = 0;
|
|
}
|
|
|
|
if (vhostfdname) {
|
|
int ret;
|
|
|
|
vhostfd = monitor_fd_param(cur_mon, vhostfdname, &err);
|
|
if (vhostfd == -1) {
|
|
if (tap->has_vhostforce && tap->vhostforce) {
|
|
error_propagate(errp, err);
|
|
} else {
|
|
warn_report_err(err);
|
|
}
|
|
return;
|
|
}
|
|
ret = qemu_try_set_nonblock(vhostfd);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d",
|
|
name, fd);
|
|
return;
|
|
}
|
|
} else {
|
|
vhostfd = open("/dev/vhost-net", O_RDWR);
|
|
if (vhostfd < 0) {
|
|
if (tap->has_vhostforce && tap->vhostforce) {
|
|
error_setg_errno(errp, errno,
|
|
"tap: open vhost char device failed");
|
|
} else {
|
|
warn_report("tap: open vhost char device failed: %s",
|
|
strerror(errno));
|
|
}
|
|
return;
|
|
}
|
|
qemu_set_nonblock(vhostfd);
|
|
}
|
|
options.opaque = (void *)(uintptr_t)vhostfd;
|
|
|
|
s->vhost_net = vhost_net_init(&options);
|
|
if (!s->vhost_net) {
|
|
if (tap->has_vhostforce && tap->vhostforce) {
|
|
error_setg(errp, VHOST_NET_INIT_FAILED);
|
|
} else {
|
|
warn_report(VHOST_NET_INIT_FAILED);
|
|
}
|
|
return;
|
|
}
|
|
} else if (vhostfdname) {
|
|
error_setg(errp, "vhostfd(s)= is not valid without vhost");
|
|
}
|
|
}
|
|
|
|
static int get_fds(char *str, char *fds[], int max)
|
|
{
|
|
char *ptr = str, *this;
|
|
size_t len = strlen(str);
|
|
int i = 0;
|
|
|
|
while (i < max && ptr < str + len) {
|
|
this = strchr(ptr, ':');
|
|
|
|
if (this == NULL) {
|
|
fds[i] = g_strdup(ptr);
|
|
} else {
|
|
fds[i] = g_strndup(ptr, this - ptr);
|
|
}
|
|
|
|
i++;
|
|
if (this == NULL) {
|
|
break;
|
|
} else {
|
|
ptr = this + 1;
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
int net_init_tap(const Netdev *netdev, const char *name,
|
|
NetClientState *peer, Error **errp)
|
|
{
|
|
const NetdevTapOptions *tap;
|
|
int fd, vnet_hdr = 0, i = 0, queues;
|
|
/* for the no-fd, no-helper case */
|
|
const char *script = NULL; /* suppress wrong "uninit'd use" gcc warning */
|
|
const char *downscript = NULL;
|
|
Error *err = NULL;
|
|
const char *vhostfdname;
|
|
char ifname[128];
|
|
int ret = 0;
|
|
|
|
assert(netdev->type == NET_CLIENT_DRIVER_TAP);
|
|
tap = &netdev->u.tap;
|
|
queues = tap->has_queues ? tap->queues : 1;
|
|
vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL;
|
|
|
|
/* QEMU hubs do not support multiqueue tap, in this case peer is set.
|
|
* For -netdev, peer is always NULL. */
|
|
if (peer && (tap->has_queues || tap->has_fds || tap->has_vhostfds)) {
|
|
error_setg(errp, "Multiqueue tap cannot be used with hubs");
|
|
return -1;
|
|
}
|
|
|
|
if (tap->has_fd) {
|
|
if (tap->has_ifname || tap->has_script || tap->has_downscript ||
|
|
tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
|
|
tap->has_fds || tap->has_vhostfds) {
|
|
error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
|
|
"helper=, queues=, fds=, and vhostfds= "
|
|
"are invalid with fd=");
|
|
return -1;
|
|
}
|
|
|
|
fd = monitor_fd_param(cur_mon, tap->fd, errp);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
ret = qemu_try_set_nonblock(fd);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d",
|
|
name, fd);
|
|
return -1;
|
|
}
|
|
|
|
vnet_hdr = tap_probe_vnet_hdr(fd, errp);
|
|
if (vnet_hdr < 0) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
net_init_tap_one(tap, peer, "tap", name, NULL,
|
|
script, downscript,
|
|
vhostfdname, vnet_hdr, fd, &err);
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
return -1;
|
|
}
|
|
} else if (tap->has_fds) {
|
|
char **fds;
|
|
char **vhost_fds;
|
|
int nfds = 0, nvhosts = 0;
|
|
|
|
if (tap->has_ifname || tap->has_script || tap->has_downscript ||
|
|
tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
|
|
tap->has_vhostfd) {
|
|
error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
|
|
"helper=, queues=, and vhostfd= "
|
|
"are invalid with fds=");
|
|
return -1;
|
|
}
|
|
|
|
fds = g_new0(char *, MAX_TAP_QUEUES);
|
|
vhost_fds = g_new0(char *, MAX_TAP_QUEUES);
|
|
|
|
nfds = get_fds(tap->fds, fds, MAX_TAP_QUEUES);
|
|
if (tap->has_vhostfds) {
|
|
nvhosts = get_fds(tap->vhostfds, vhost_fds, MAX_TAP_QUEUES);
|
|
if (nfds != nvhosts) {
|
|
error_setg(errp, "The number of fds passed does not match "
|
|
"the number of vhostfds passed");
|
|
ret = -1;
|
|
goto free_fail;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < nfds; i++) {
|
|
fd = monitor_fd_param(cur_mon, fds[i], errp);
|
|
if (fd == -1) {
|
|
ret = -1;
|
|
goto free_fail;
|
|
}
|
|
|
|
ret = qemu_try_set_nonblock(fd);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d",
|
|
name, fd);
|
|
goto free_fail;
|
|
}
|
|
|
|
if (i == 0) {
|
|
vnet_hdr = tap_probe_vnet_hdr(fd, errp);
|
|
if (vnet_hdr < 0) {
|
|
goto free_fail;
|
|
}
|
|
} else if (vnet_hdr != tap_probe_vnet_hdr(fd, NULL)) {
|
|
error_setg(errp,
|
|
"vnet_hdr not consistent across given tap fds");
|
|
ret = -1;
|
|
goto free_fail;
|
|
}
|
|
|
|
net_init_tap_one(tap, peer, "tap", name, ifname,
|
|
script, downscript,
|
|
tap->has_vhostfds ? vhost_fds[i] : NULL,
|
|
vnet_hdr, fd, &err);
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
ret = -1;
|
|
goto free_fail;
|
|
}
|
|
}
|
|
|
|
free_fail:
|
|
for (i = 0; i < nvhosts; i++) {
|
|
g_free(vhost_fds[i]);
|
|
}
|
|
for (i = 0; i < nfds; i++) {
|
|
g_free(fds[i]);
|
|
}
|
|
g_free(fds);
|
|
g_free(vhost_fds);
|
|
return ret;
|
|
} else if (tap->has_helper) {
|
|
if (tap->has_ifname || tap->has_script || tap->has_downscript ||
|
|
tap->has_vnet_hdr || tap->has_queues || tap->has_vhostfds) {
|
|
error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
|
|
"queues=, and vhostfds= are invalid with helper=");
|
|
return -1;
|
|
}
|
|
|
|
fd = net_bridge_run_helper(tap->helper,
|
|
tap->has_br ?
|
|
tap->br : DEFAULT_BRIDGE_INTERFACE,
|
|
errp);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
qemu_set_nonblock(fd);
|
|
vnet_hdr = tap_probe_vnet_hdr(fd, errp);
|
|
if (vnet_hdr < 0) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
net_init_tap_one(tap, peer, "bridge", name, ifname,
|
|
script, downscript, vhostfdname,
|
|
vnet_hdr, fd, &err);
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (tap->has_vhostfds) {
|
|
error_setg(errp, "vhostfds= is invalid if fds= wasn't specified");
|
|
return -1;
|
|
}
|
|
script = tap->has_script ? tap->script : DEFAULT_NETWORK_SCRIPT;
|
|
downscript = tap->has_downscript ? tap->downscript :
|
|
DEFAULT_NETWORK_DOWN_SCRIPT;
|
|
|
|
if (tap->has_ifname) {
|
|
pstrcpy(ifname, sizeof ifname, tap->ifname);
|
|
} else {
|
|
ifname[0] = '\0';
|
|
}
|
|
|
|
for (i = 0; i < queues; i++) {
|
|
fd = net_tap_init(tap, &vnet_hdr, i >= 1 ? "no" : script,
|
|
ifname, sizeof ifname, queues > 1, errp);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
|
|
if (queues > 1 && i == 0 && !tap->has_ifname) {
|
|
if (tap_fd_get_ifname(fd, ifname)) {
|
|
error_setg(errp, "Fail to get ifname");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
net_init_tap_one(tap, peer, "tap", name, ifname,
|
|
i >= 1 ? "no" : script,
|
|
i >= 1 ? "no" : downscript,
|
|
vhostfdname, vnet_hdr, fd, &err);
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
VHostNetState *tap_get_vhost_net(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
|
|
return s->vhost_net;
|
|
}
|
|
|
|
int tap_enable(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
int ret;
|
|
|
|
if (s->enabled) {
|
|
return 0;
|
|
} else {
|
|
ret = tap_fd_enable(s->fd);
|
|
if (ret == 0) {
|
|
s->enabled = true;
|
|
tap_update_fd_handler(s);
|
|
}
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
int tap_disable(NetClientState *nc)
|
|
{
|
|
TAPState *s = DO_UPCAST(TAPState, nc, nc);
|
|
int ret;
|
|
|
|
if (s->enabled == 0) {
|
|
return 0;
|
|
} else {
|
|
ret = tap_fd_disable(s->fd);
|
|
if (ret == 0) {
|
|
qemu_purge_queued_packets(nc);
|
|
s->enabled = false;
|
|
tap_update_fd_handler(s);
|
|
}
|
|
return ret;
|
|
}
|
|
}
|