diff options
Diffstat (limited to 'src/net/tap.c')
| -rw-r--r-- | src/net/tap.c | 930 |
1 files changed, 930 insertions, 0 deletions
diff --git a/src/net/tap.c b/src/net/tap.c new file mode 100644 index 0000000..85c4142 --- /dev/null +++ b/src/net/tap.c @@ -0,0 +1,930 @@ +/* + * 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 "tap_int.h" + +#include "config-host.h" + +#include <sys/ioctl.h> +#include <sys/stat.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 "qemu-common.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; + + 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 (tap->has_vhostfd || tap->has_vhostfds) { + 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 (tap->has_vhostfd || tap->has_vhostfds) { + 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; + 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; + } +} |
