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-rw-r--r--qemu/net/tap-linux.c316
1 files changed, 0 insertions, 316 deletions
diff --git a/qemu/net/tap-linux.c b/qemu/net/tap-linux.c
deleted file mode 100644
index a503fa9c6..000000000
--- a/qemu/net/tap-linux.c
+++ /dev/null
@@ -1,316 +0,0 @@
-/*
- * QEMU System Emulator
- *
- * Copyright (c) 2003-2008 Fabrice Bellard
- * Copyright (c) 2009 Red Hat, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "qemu/osdep.h"
-#include "tap_int.h"
-#include "tap-linux.h"
-#include "net/tap.h"
-
-#include <net/if.h>
-#include <sys/ioctl.h>
-
-#include "sysemu/sysemu.h"
-#include "qapi/error.h"
-#include "qemu/error-report.h"
-#include "qemu/cutils.h"
-
-#define PATH_NET_TUN "/dev/net/tun"
-
-int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
- int vnet_hdr_required, int mq_required, Error **errp)
-{
- struct ifreq ifr;
- int fd, ret;
- int len = sizeof(struct virtio_net_hdr);
- unsigned int features;
-
- TFR(fd = open(PATH_NET_TUN, O_RDWR));
- if (fd < 0) {
- error_setg_errno(errp, errno, "could not open %s", PATH_NET_TUN);
- return -1;
- }
- memset(&ifr, 0, sizeof(ifr));
- ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
-
- if (ioctl(fd, TUNGETFEATURES, &features) == -1) {
- error_report("warning: TUNGETFEATURES failed: %s", strerror(errno));
- features = 0;
- }
-
- if (features & IFF_ONE_QUEUE) {
- ifr.ifr_flags |= IFF_ONE_QUEUE;
- }
-
- if (*vnet_hdr) {
- if (features & IFF_VNET_HDR) {
- *vnet_hdr = 1;
- ifr.ifr_flags |= IFF_VNET_HDR;
- } else {
- *vnet_hdr = 0;
- }
-
- if (vnet_hdr_required && !*vnet_hdr) {
- error_setg(errp, "vnet_hdr=1 requested, but no kernel "
- "support for IFF_VNET_HDR available");
- close(fd);
- return -1;
- }
- /*
- * Make sure vnet header size has the default value: for a persistent
- * tap it might have been modified e.g. by another instance of qemu.
- * Ignore errors since old kernels do not support this ioctl: in this
- * case the header size implicitly has the correct value.
- */
- ioctl(fd, TUNSETVNETHDRSZ, &len);
- }
-
- if (mq_required) {
- if (!(features & IFF_MULTI_QUEUE)) {
- error_setg(errp, "multiqueue required, but no kernel "
- "support for IFF_MULTI_QUEUE available");
- close(fd);
- return -1;
- } else {
- ifr.ifr_flags |= IFF_MULTI_QUEUE;
- }
- }
-
- if (ifname[0] != '\0')
- pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname);
- else
- pstrcpy(ifr.ifr_name, IFNAMSIZ, "tap%d");
- ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
- if (ret != 0) {
- if (ifname[0] != '\0') {
- error_setg_errno(errp, errno, "could not configure %s (%s)",
- PATH_NET_TUN, ifr.ifr_name);
- } else {
- error_setg_errno(errp, errno, "could not configure %s",
- PATH_NET_TUN);
- }
- close(fd);
- return -1;
- }
- pstrcpy(ifname, ifname_size, ifr.ifr_name);
- fcntl(fd, F_SETFL, O_NONBLOCK);
- return fd;
-}
-
-/* sndbuf implements a kind of flow control for tap.
- * Unfortunately when it's enabled, and packets are sent
- * to other guests on the same host, the receiver
- * can lock up the transmitter indefinitely.
- *
- * To avoid packet loss, sndbuf should be set to a value lower than the tx
- * queue capacity of any destination network interface.
- * Ethernet NICs generally have txqueuelen=1000, so 1Mb is
- * a good value, given a 1500 byte MTU.
- */
-#define TAP_DEFAULT_SNDBUF 0
-
-void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp)
-{
- int sndbuf;
-
- sndbuf = !tap->has_sndbuf ? TAP_DEFAULT_SNDBUF :
- tap->sndbuf > INT_MAX ? INT_MAX :
- tap->sndbuf;
-
- if (!sndbuf) {
- sndbuf = INT_MAX;
- }
-
- if (ioctl(fd, TUNSETSNDBUF, &sndbuf) == -1 && tap->has_sndbuf) {
- error_setg_errno(errp, errno, "TUNSETSNDBUF ioctl failed");
- }
-}
-
-int tap_probe_vnet_hdr(int fd)
-{
- struct ifreq ifr;
-
- if (ioctl(fd, TUNGETIFF, &ifr) != 0) {
- error_report("TUNGETIFF ioctl() failed: %s", strerror(errno));
- return 0;
- }
-
- return ifr.ifr_flags & IFF_VNET_HDR;
-}
-
-int tap_probe_has_ufo(int fd)
-{
- unsigned offload;
-
- offload = TUN_F_CSUM | TUN_F_UFO;
-
- if (ioctl(fd, TUNSETOFFLOAD, offload) < 0)
- return 0;
-
- return 1;
-}
-
-/* Verify that we can assign given length */
-int tap_probe_vnet_hdr_len(int fd, int len)
-{
- int orig;
- if (ioctl(fd, TUNGETVNETHDRSZ, &orig) == -1) {
- return 0;
- }
- if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1) {
- return 0;
- }
- /* Restore original length: we can't handle failure. */
- if (ioctl(fd, TUNSETVNETHDRSZ, &orig) == -1) {
- fprintf(stderr, "TUNGETVNETHDRSZ ioctl() failed: %s. Exiting.\n",
- strerror(errno));
- abort();
- return -errno;
- }
- return 1;
-}
-
-void tap_fd_set_vnet_hdr_len(int fd, int len)
-{
- if (ioctl(fd, TUNSETVNETHDRSZ, &len) == -1) {
- fprintf(stderr, "TUNSETVNETHDRSZ ioctl() failed: %s. Exiting.\n",
- strerror(errno));
- abort();
- }
-}
-
-int tap_fd_set_vnet_le(int fd, int is_le)
-{
- int arg = is_le ? 1 : 0;
-
- if (!ioctl(fd, TUNSETVNETLE, &arg)) {
- return 0;
- }
-
- /* Check if our kernel supports TUNSETVNETLE */
- if (errno == EINVAL) {
- return -errno;
- }
-
- error_report("TUNSETVNETLE ioctl() failed: %s.", strerror(errno));
- abort();
-}
-
-int tap_fd_set_vnet_be(int fd, int is_be)
-{
- int arg = is_be ? 1 : 0;
-
- if (!ioctl(fd, TUNSETVNETBE, &arg)) {
- return 0;
- }
-
- /* Check if our kernel supports TUNSETVNETBE */
- if (errno == EINVAL) {
- return -errno;
- }
-
- error_report("TUNSETVNETBE ioctl() failed: %s.", strerror(errno));
- abort();
-}
-
-void tap_fd_set_offload(int fd, int csum, int tso4,
- int tso6, int ecn, int ufo)
-{
- unsigned int offload = 0;
-
- /* Check if our kernel supports TUNSETOFFLOAD */
- if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) {
- return;
- }
-
- if (csum) {
- offload |= TUN_F_CSUM;
- if (tso4)
- offload |= TUN_F_TSO4;
- if (tso6)
- offload |= TUN_F_TSO6;
- if ((tso4 || tso6) && ecn)
- offload |= TUN_F_TSO_ECN;
- if (ufo)
- offload |= TUN_F_UFO;
- }
-
- if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
- offload &= ~TUN_F_UFO;
- if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
- fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n",
- strerror(errno));
- }
- }
-}
-
-/* Enable a specific queue of tap. */
-int tap_fd_enable(int fd)
-{
- struct ifreq ifr;
- int ret;
-
- memset(&ifr, 0, sizeof(ifr));
-
- ifr.ifr_flags = IFF_ATTACH_QUEUE;
- ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr);
-
- if (ret != 0) {
- error_report("could not enable queue");
- }
-
- return ret;
-}
-
-/* Disable a specific queue of tap/ */
-int tap_fd_disable(int fd)
-{
- struct ifreq ifr;
- int ret;
-
- memset(&ifr, 0, sizeof(ifr));
-
- ifr.ifr_flags = IFF_DETACH_QUEUE;
- ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr);
-
- if (ret != 0) {
- error_report("could not disable queue");
- }
-
- return ret;
-}
-
-int tap_fd_get_ifname(int fd, char *ifname)
-{
- struct ifreq ifr;
-
- if (ioctl(fd, TUNGETIFF, &ifr) != 0) {
- error_report("TUNGETIFF ioctl() failed: %s",
- strerror(errno));
- return -1;
- }
-
- pstrcpy(ifname, sizeof(ifr.ifr_name), ifr.ifr_name);
- return 0;
-}