diff options
Diffstat (limited to 'qemu/net/tap.c')
| -rw-r--r-- | qemu/net/tap.c | 931 |
1 files changed, 0 insertions, 931 deletions
diff --git a/qemu/net/tap.c b/qemu/net/tap.c deleted file mode 100644 index 740e8a261..000000000 --- a/qemu/net/tap.c +++ /dev/null @@ -1,931 +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 <sys/ioctl.h> -#include <sys/wait.h> -#include <sys/socket.h> -#include <net/if.h> - -#include "net/net.h" -#include "clients.h" -#include "monitor/monitor.h" -#include "sysemu/sysemu.h" -#include "qapi/error.h" -#include "qemu-common.h" -#include "qemu/cutils.h" -#include "qemu/error-report.h" - -#include "net/tap.h" - -#include "net/vhost_net.h" - -typedef struct TAPState { - NetClientState nc; - int fd; - char down_script[1024]; - char down_script_arg[128]; - uint8_t buf[NET_BUFSIZE]; - bool read_poll; - bool write_poll; - bool using_vnet_hdr; - bool has_ufo; - bool enabled; - VHostNetState *vhost_net; - unsigned host_vnet_hdr_len; -} TAPState; - -static void launch_script(const char *setup_script, const char *ifname, - int fd, Error **errp); - -static void tap_send(void *opaque); -static void tap_writable(void *opaque); - -static void tap_update_fd_handler(TAPState *s) -{ - qemu_set_fd_handler(s->fd, - s->read_poll && s->enabled ? tap_send : NULL, - s->write_poll && s->enabled ? tap_writable : NULL, - s); -} - -static void tap_read_poll(TAPState *s, bool enable) -{ - s->read_poll = enable; - tap_update_fd_handler(s); -} - -static void tap_write_poll(TAPState *s, bool enable) -{ - s->write_poll = enable; - tap_update_fd_handler(s); -} - -static void tap_writable(void *opaque) -{ - TAPState *s = opaque; - - tap_write_poll(s, false); - - qemu_flush_queued_packets(&s->nc); -} - -static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt) -{ - ssize_t len; - - do { - len = writev(s->fd, iov, iovcnt); - } while (len == -1 && errno == EINTR); - - if (len == -1 && errno == EAGAIN) { - tap_write_poll(s, true); - return 0; - } - - return len; -} - -static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov, - int iovcnt) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - const struct iovec *iovp = iov; - struct iovec iov_copy[iovcnt + 1]; - struct virtio_net_hdr_mrg_rxbuf hdr = { }; - - if (s->host_vnet_hdr_len && !s->using_vnet_hdr) { - iov_copy[0].iov_base = &hdr; - iov_copy[0].iov_len = s->host_vnet_hdr_len; - memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); - iovp = iov_copy; - iovcnt++; - } - - return tap_write_packet(s, iovp, iovcnt); -} - -static ssize_t tap_receive_raw(NetClientState *nc, const uint8_t *buf, size_t size) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - struct iovec iov[2]; - int iovcnt = 0; - struct virtio_net_hdr_mrg_rxbuf hdr = { }; - - if (s->host_vnet_hdr_len) { - iov[iovcnt].iov_base = &hdr; - iov[iovcnt].iov_len = s->host_vnet_hdr_len; - iovcnt++; - } - - iov[iovcnt].iov_base = (char *)buf; - iov[iovcnt].iov_len = size; - iovcnt++; - - return tap_write_packet(s, iov, iovcnt); -} - -static ssize_t tap_receive(NetClientState *nc, const uint8_t *buf, size_t size) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - struct iovec iov[1]; - - if (s->host_vnet_hdr_len && !s->using_vnet_hdr) { - return tap_receive_raw(nc, buf, size); - } - - iov[0].iov_base = (char *)buf; - iov[0].iov_len = size; - - return tap_write_packet(s, iov, 1); -} - -#ifndef __sun__ -ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) -{ - return read(tapfd, buf, maxlen); -} -#endif - -static void tap_send_completed(NetClientState *nc, ssize_t len) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - tap_read_poll(s, true); -} - -static void tap_send(void *opaque) -{ - TAPState *s = opaque; - int size; - int packets = 0; - - while (true) { - uint8_t *buf = s->buf; - - size = tap_read_packet(s->fd, s->buf, sizeof(s->buf)); - if (size <= 0) { - break; - } - - if (s->host_vnet_hdr_len && !s->using_vnet_hdr) { - buf += s->host_vnet_hdr_len; - size -= s->host_vnet_hdr_len; - } - - size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed); - if (size == 0) { - tap_read_poll(s, false); - break; - } else if (size < 0) { - break; - } - - /* - * When the host keeps receiving more packets while tap_send() is - * running we can hog the QEMU global mutex. Limit the number of - * packets that are processed per tap_send() callback to prevent - * stalling the guest. - */ - packets++; - if (packets >= 50) { - break; - } - } -} - -static bool tap_has_ufo(NetClientState *nc) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - - assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); - - return s->has_ufo; -} - -static bool tap_has_vnet_hdr(NetClientState *nc) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - - assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); - - return !!s->host_vnet_hdr_len; -} - -static bool tap_has_vnet_hdr_len(NetClientState *nc, int len) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - - assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); - - return !!tap_probe_vnet_hdr_len(s->fd, len); -} - -static void tap_set_vnet_hdr_len(NetClientState *nc, int len) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - - assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); - assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) || - len == sizeof(struct virtio_net_hdr)); - - tap_fd_set_vnet_hdr_len(s->fd, len); - s->host_vnet_hdr_len = len; -} - -static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - - assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); - assert(!!s->host_vnet_hdr_len == using_vnet_hdr); - - s->using_vnet_hdr = using_vnet_hdr; -} - -static int tap_set_vnet_le(NetClientState *nc, bool is_le) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - - return tap_fd_set_vnet_le(s->fd, is_le); -} - -static int tap_set_vnet_be(NetClientState *nc, bool is_be) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - - return tap_fd_set_vnet_be(s->fd, is_be); -} - -static void tap_set_offload(NetClientState *nc, int csum, int tso4, - int tso6, int ecn, int ufo) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - if (s->fd < 0) { - return; - } - - tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo); -} - -static void tap_cleanup(NetClientState *nc) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - Error *err = NULL; - - if (s->vhost_net) { - vhost_net_cleanup(s->vhost_net); - s->vhost_net = NULL; - } - - qemu_purge_queued_packets(nc); - - if (s->down_script[0]) { - launch_script(s->down_script, s->down_script_arg, s->fd, &err); - if (err) { - error_report_err(err); - } - } - - tap_read_poll(s, false); - tap_write_poll(s, false); - close(s->fd); - s->fd = -1; -} - -static void tap_poll(NetClientState *nc, bool enable) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - tap_read_poll(s, enable); - tap_write_poll(s, enable); -} - -int tap_get_fd(NetClientState *nc) -{ - TAPState *s = DO_UPCAST(TAPState, nc, nc); - assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP); - return s->fd; -} - -/* fd support */ - -static NetClientInfo net_tap_info = { - .type = NET_CLIENT_OPTIONS_KIND_TAP, - .size = sizeof(TAPState), - .receive = tap_receive, - .receive_raw = tap_receive_raw, - .receive_iov = tap_receive_iov, - .poll = tap_poll, - .cleanup = tap_cleanup, - .has_ufo = tap_has_ufo, - .has_vnet_hdr = tap_has_vnet_hdr, - .has_vnet_hdr_len = tap_has_vnet_hdr_len, - .using_vnet_hdr = tap_using_vnet_hdr, - .set_offload = tap_set_offload, - .set_vnet_hdr_len = tap_set_vnet_hdr_len, - .set_vnet_le = tap_set_vnet_le, - .set_vnet_be = tap_set_vnet_be, -}; - -static TAPState *net_tap_fd_init(NetClientState *peer, - const char *model, - const char *name, - int fd, - int vnet_hdr) -{ - NetClientState *nc; - TAPState *s; - - nc = qemu_new_net_client(&net_tap_info, peer, model, name); - - s = DO_UPCAST(TAPState, nc, nc); - - s->fd = fd; - s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0; - s->using_vnet_hdr = false; - s->has_ufo = tap_probe_has_ufo(s->fd); - s->enabled = true; - tap_set_offload(&s->nc, 0, 0, 0, 0, 0); - /* - * Make sure host header length is set correctly in tap: - * it might have been modified by another instance of qemu. - */ - if (tap_probe_vnet_hdr_len(s->fd, s->host_vnet_hdr_len)) { - tap_fd_set_vnet_hdr_len(s->fd, s->host_vnet_hdr_len); - } - tap_read_poll(s, true); - s->vhost_net = NULL; - return s; -} - -static void launch_script(const char *setup_script, const char *ifname, - int fd, Error **errp) -{ - int pid, status; - char *args[3]; - char **parg; - - /* try to launch network script */ - pid = fork(); - if (pid < 0) { - error_setg_errno(errp, errno, "could not launch network script %s", - setup_script); - return; - } - if (pid == 0) { - int open_max = sysconf(_SC_OPEN_MAX), i; - - for (i = 3; i < open_max; i++) { - if (i != fd) { - close(i); - } - } - parg = args; - *parg++ = (char *)setup_script; - *parg++ = (char *)ifname; - *parg = NULL; - execv(setup_script, args); - _exit(1); - } else { - while (waitpid(pid, &status, 0) != pid) { - /* loop */ - } - - if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { - return; - } - error_setg(errp, "network script %s failed with status %d", - setup_script, status); - } -} - -static int recv_fd(int c) -{ - int fd; - uint8_t msgbuf[CMSG_SPACE(sizeof(fd))]; - struct msghdr msg = { - .msg_control = msgbuf, - .msg_controllen = sizeof(msgbuf), - }; - struct cmsghdr *cmsg; - struct iovec iov; - uint8_t req[1]; - ssize_t len; - - cmsg = CMSG_FIRSTHDR(&msg); - cmsg->cmsg_level = SOL_SOCKET; - cmsg->cmsg_type = SCM_RIGHTS; - cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); - msg.msg_controllen = cmsg->cmsg_len; - - iov.iov_base = req; - iov.iov_len = sizeof(req); - - msg.msg_iov = &iov; - msg.msg_iovlen = 1; - - len = recvmsg(c, &msg, 0); - if (len > 0) { - memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd)); - return fd; - } - - return len; -} - -static int net_bridge_run_helper(const char *helper, const char *bridge, - Error **errp) -{ - sigset_t oldmask, mask; - int pid, status; - char *args[5]; - char **parg; - int sv[2]; - - sigemptyset(&mask); - sigaddset(&mask, SIGCHLD); - sigprocmask(SIG_BLOCK, &mask, &oldmask); - - if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) { - error_setg_errno(errp, errno, "socketpair() failed"); - return -1; - } - - /* try to launch bridge helper */ - pid = fork(); - if (pid < 0) { - error_setg_errno(errp, errno, "Can't fork bridge helper"); - return -1; - } - if (pid == 0) { - int open_max = sysconf(_SC_OPEN_MAX), i; - char fd_buf[6+10]; - char br_buf[6+IFNAMSIZ] = {0}; - char helper_cmd[PATH_MAX + sizeof(fd_buf) + sizeof(br_buf) + 15]; - - for (i = 3; i < open_max; i++) { - if (i != sv[1]) { - close(i); - } - } - - snprintf(fd_buf, sizeof(fd_buf), "%s%d", "--fd=", sv[1]); - - if (strrchr(helper, ' ') || strrchr(helper, '\t')) { - /* assume helper is a command */ - - if (strstr(helper, "--br=") == NULL) { - snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge); - } - - snprintf(helper_cmd, sizeof(helper_cmd), "%s %s %s %s", - helper, "--use-vnet", fd_buf, br_buf); - - parg = args; - *parg++ = (char *)"sh"; - *parg++ = (char *)"-c"; - *parg++ = helper_cmd; - *parg++ = NULL; - - execv("/bin/sh", args); - } else { - /* assume helper is just the executable path name */ - - snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge); - - parg = args; - *parg++ = (char *)helper; - *parg++ = (char *)"--use-vnet"; - *parg++ = fd_buf; - *parg++ = br_buf; - *parg++ = NULL; - - execv(helper, args); - } - _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 NetClientOptions *opts, const char *name, - NetClientState *peer, Error **errp) -{ - const NetdevBridgeOptions *bridge; - const char *helper, *br; - TAPState *s; - int fd, vnet_hdr; - - assert(opts->type == NET_CLIENT_OPTIONS_KIND_BRIDGE); - bridge = opts->u.bridge.data; - - 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; - } - - fcntl(fd, F_SETFL, O_NONBLOCK); - vnet_hdr = tap_probe_vnet_hdr(fd); - 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 (vhostfdname) { - vhostfd = monitor_fd_param(cur_mon, vhostfdname, &err); - if (vhostfd == -1) { - error_propagate(errp, err); - return; - } - } else { - vhostfd = open("/dev/vhost-net", O_RDWR); - if (vhostfd < 0) { - error_setg_errno(errp, errno, - "tap: open vhost char device failed"); - return; - } - } - options.opaque = (void *)(uintptr_t)vhostfd; - - s->vhost_net = vhost_net_init(&options); - if (!s->vhost_net) { - error_setg(errp, - "vhost-net requested but could not be initialized"); - return; - } - } else if (vhostfdname) { - error_setg(errp, "vhostfd= 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 NetClientOptions *opts, 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]; - - assert(opts->type == NET_CLIENT_OPTIONS_KIND_TAP); - tap = opts->u.tap.data; - queues = tap->has_queues ? tap->queues : 1; - vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL; - - /* QEMU vlans does 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 QEMU vlans"); - 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, &err); - if (fd == -1) { - error_propagate(errp, err); - return -1; - } - - fcntl(fd, F_SETFL, O_NONBLOCK); - - vnet_hdr = tap_probe_vnet_hdr(fd); - - 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[MAX_TAP_QUEUES]; - char *vhost_fds[MAX_TAP_QUEUES]; - int nfds, nvhosts; - - 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; - } - - 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"); - return -1; - } - } - - for (i = 0; i < nfds; i++) { - fd = monitor_fd_param(cur_mon, fds[i], &err); - if (fd == -1) { - error_propagate(errp, err); - return -1; - } - - fcntl(fd, F_SETFL, O_NONBLOCK); - - if (i == 0) { - vnet_hdr = tap_probe_vnet_hdr(fd); - } else if (vnet_hdr != tap_probe_vnet_hdr(fd)) { - error_setg(errp, - "vnet_hdr not consistent across given tap fds"); - return -1; - } - - 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); - return -1; - } - } - } 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, DEFAULT_BRIDGE_INTERFACE, - errp); - if (fd == -1) { - return -1; - } - - fcntl(fd, F_SETFL, O_NONBLOCK); - vnet_hdr = tap_probe_vnet_hdr(fd); - - 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_OPTIONS_KIND_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; - } -} |