diff options
Diffstat (limited to 'net/passt.c')
| -rw-r--r-- | net/passt.c | 753 |
1 files changed, 753 insertions, 0 deletions
diff --git a/net/passt.c b/net/passt.c new file mode 100644 index 0000000..6f616ba --- /dev/null +++ b/net/passt.c @@ -0,0 +1,753 @@ +/* + * passt network backend + * + * Copyright Red Hat + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#include "qemu/osdep.h" +#include <glib/gstdio.h> +#include "qemu/error-report.h" +#include <gio/gio.h> +#include "net/net.h" +#include "clients.h" +#include "qapi/error.h" +#include "io/net-listener.h" +#include "chardev/char-fe.h" +#include "net/vhost_net.h" +#include "hw/virtio/vhost.h" +#include "hw/virtio/vhost-user.h" +#include "standard-headers/linux/virtio_net.h" +#include "stream_data.h" + +#ifdef CONFIG_VHOST_USER +static const int user_feature_bits[] = { + VIRTIO_F_NOTIFY_ON_EMPTY, + VIRTIO_F_NOTIFICATION_DATA, + VIRTIO_RING_F_INDIRECT_DESC, + VIRTIO_RING_F_EVENT_IDX, + + VIRTIO_F_ANY_LAYOUT, + VIRTIO_F_VERSION_1, + VIRTIO_NET_F_CSUM, + VIRTIO_NET_F_GUEST_CSUM, + VIRTIO_NET_F_GSO, + VIRTIO_NET_F_GUEST_TSO4, + VIRTIO_NET_F_GUEST_TSO6, + VIRTIO_NET_F_GUEST_ECN, + VIRTIO_NET_F_GUEST_UFO, + VIRTIO_NET_F_HOST_TSO4, + VIRTIO_NET_F_HOST_TSO6, + VIRTIO_NET_F_HOST_ECN, + VIRTIO_NET_F_HOST_UFO, + VIRTIO_NET_F_MRG_RXBUF, + VIRTIO_NET_F_MTU, + VIRTIO_F_IOMMU_PLATFORM, + VIRTIO_F_RING_PACKED, + VIRTIO_F_RING_RESET, + VIRTIO_F_IN_ORDER, + VIRTIO_NET_F_RSS, + VIRTIO_NET_F_RSC_EXT, + VIRTIO_NET_F_HASH_REPORT, + VIRTIO_NET_F_GUEST_USO4, + VIRTIO_NET_F_GUEST_USO6, + VIRTIO_NET_F_HOST_USO, + + /* This bit implies RARP isn't sent by QEMU out of band */ + VIRTIO_NET_F_GUEST_ANNOUNCE, + + VIRTIO_NET_F_MQ, + + VHOST_INVALID_FEATURE_BIT +}; +#endif + +typedef struct NetPasstState { + NetStreamData data; + GPtrArray *args; + gchar *pidfile; + pid_t pid; +#ifdef CONFIG_VHOST_USER + /* vhost user */ + VhostUserState *vhost_user; + VHostNetState *vhost_net; + CharBackend vhost_chr; + guint vhost_watch; + uint64_t acked_features; + bool started; +#endif +} NetPasstState; + +static int net_passt_stream_start(NetPasstState *s, Error **errp); + +static void net_passt_cleanup(NetClientState *nc) +{ + NetPasstState *s = DO_UPCAST(NetPasstState, data.nc, nc); + +#ifdef CONFIG_VHOST_USER + if (s->vhost_net) { + vhost_net_cleanup(s->vhost_net); + g_free(s->vhost_net); + s->vhost_net = NULL; + } + if (s->vhost_watch) { + g_source_remove(s->vhost_watch); + s->vhost_watch = 0; + } + qemu_chr_fe_deinit(&s->vhost_chr, true); + if (s->vhost_user) { + vhost_user_cleanup(s->vhost_user); + g_free(s->vhost_user); + s->vhost_user = NULL; + } +#endif + + kill(s->pid, SIGTERM); + g_remove(s->pidfile); + g_free(s->pidfile); + g_ptr_array_free(s->args, TRUE); +} + +static ssize_t net_passt_receive(NetClientState *nc, const uint8_t *buf, + size_t size) +{ + NetStreamData *d = DO_UPCAST(NetStreamData, nc, nc); + + return net_stream_data_receive(d, buf, size); +} + +static gboolean net_passt_send(QIOChannel *ioc, GIOCondition condition, + gpointer data) +{ + if (net_stream_data_send(ioc, condition, data) == G_SOURCE_REMOVE) { + NetPasstState *s = DO_UPCAST(NetPasstState, data, data); + Error *error; + + /* we need to restart passt */ + kill(s->pid, SIGTERM); + if (net_passt_stream_start(s, &error) == -1) { + error_report_err(error); + } + + return G_SOURCE_REMOVE; + } + + return G_SOURCE_CONTINUE; +} + +#ifdef CONFIG_VHOST_USER +static int passt_set_vnet_endianness(NetClientState *nc, bool enable) +{ + assert(nc->info->type == NET_CLIENT_DRIVER_PASST); + + return 0; +} + +static bool passt_has_vnet_hdr(NetClientState *nc) +{ + NetPasstState *s = DO_UPCAST(NetPasstState, data.nc, nc); + + assert(nc->info->type == NET_CLIENT_DRIVER_PASST); + + return s->vhost_user != NULL; +} + +static bool passt_has_ufo(NetClientState *nc) +{ + NetPasstState *s = DO_UPCAST(NetPasstState, data.nc, nc); + + assert(nc->info->type == NET_CLIENT_DRIVER_PASST); + + return s->vhost_user != NULL; +} + +static bool passt_check_peer_type(NetClientState *nc, ObjectClass *oc, + Error **errp) +{ + NetPasstState *s = DO_UPCAST(NetPasstState, data.nc, nc); + const char *driver = object_class_get_name(oc); + + assert(nc->info->type == NET_CLIENT_DRIVER_PASST); + + if (s->vhost_user == NULL) { + return true; + } + + if (!g_str_has_prefix(driver, "virtio-net-")) { + error_setg(errp, "vhost-user requires frontend driver virtio-net-*"); + return false; + } + + return true; +} + +static struct vhost_net *passt_get_vhost_net(NetClientState *nc) +{ + NetPasstState *s = DO_UPCAST(NetPasstState, data.nc, nc); + + assert(nc->info->type == NET_CLIENT_DRIVER_PASST); + + return s->vhost_net; +} + +static uint64_t passt_get_acked_features(NetClientState *nc) +{ + NetPasstState *s = DO_UPCAST(NetPasstState, data.nc, nc); + + assert(nc->info->type == NET_CLIENT_DRIVER_PASST); + + return s->acked_features; +} + +static void passt_save_acked_features(NetClientState *nc) +{ + NetPasstState *s = DO_UPCAST(NetPasstState, data.nc, nc); + + assert(nc->info->type == NET_CLIENT_DRIVER_PASST); + + if (s->vhost_net) { + uint64_t features = vhost_net_get_acked_features(s->vhost_net); + if (features) { + s->acked_features = features; + } + } +} +#endif + +static NetClientInfo net_passt_info = { + .type = NET_CLIENT_DRIVER_PASST, + .size = sizeof(NetPasstState), + .receive = net_passt_receive, + .cleanup = net_passt_cleanup, +#ifdef CONFIG_VHOST_USER + .has_vnet_hdr = passt_has_vnet_hdr, + .has_ufo = passt_has_ufo, + .set_vnet_be = passt_set_vnet_endianness, + .set_vnet_le = passt_set_vnet_endianness, + .check_peer_type = passt_check_peer_type, + .get_vhost_net = passt_get_vhost_net, +#endif +}; + +static void net_passt_client_connected(QIOTask *task, gpointer opaque) +{ + NetPasstState *s = opaque; + + if (net_stream_data_client_connected(task, &s->data) == 0) { + qemu_set_info_str(&s->data.nc, "stream,connected to pid %d", s->pid); + } +} + +static int net_passt_start_daemon(NetPasstState *s, int sock, Error **errp) +{ + g_autoptr(GSubprocess) daemon = NULL; + g_autofree gchar *contents = NULL; + g_autoptr(GError) error = NULL; + GSubprocessLauncher *launcher; + + qemu_set_info_str(&s->data.nc, "launching passt"); + + launcher = g_subprocess_launcher_new(G_SUBPROCESS_FLAGS_NONE); + g_subprocess_launcher_take_fd(launcher, sock, 3); + + daemon = g_subprocess_launcher_spawnv(launcher, + (const gchar *const *)s->args->pdata, + &error); + g_object_unref(launcher); + + if (!daemon) { + error_setg(errp, "Error creating daemon: %s", error->message); + return -1; + } + + if (!g_subprocess_wait(daemon, NULL, &error)) { + error_setg(errp, "Error waiting for daemon: %s", error->message); + return -1; + } + + if (g_subprocess_get_if_exited(daemon) && + g_subprocess_get_exit_status(daemon)) { + return -1; + } + + if (!g_file_get_contents(s->pidfile, &contents, NULL, &error)) { + error_setg(errp, "Cannot read passt pid: %s", error->message); + return -1; + } + + s->pid = (pid_t)g_ascii_strtoll(contents, NULL, 10); + if (s->pid <= 0) { + error_setg(errp, "File '%s' did not contain a valid PID.", s->pidfile); + return -1; + } + + return 0; +} + +static int net_passt_stream_start(NetPasstState *s, Error **errp) +{ + QIOChannelSocket *sioc; + SocketAddress *addr; + int sv[2]; + + if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) { + error_setg_errno(errp, errno, "socketpair() failed"); + return -1; + } + + /* connect to passt */ + qemu_set_info_str(&s->data.nc, "connecting to passt"); + + /* create socket channel */ + sioc = qio_channel_socket_new(); + s->data.ioc = QIO_CHANNEL(sioc); + s->data.nc.link_down = true; + s->data.send = net_passt_send; + + addr = g_new0(SocketAddress, 1); + addr->type = SOCKET_ADDRESS_TYPE_FD; + addr->u.fd.str = g_strdup_printf("%d", sv[0]); + + qio_channel_socket_connect_async(sioc, addr, + net_passt_client_connected, s, + NULL, NULL); + + qapi_free_SocketAddress(addr); + + /* start passt */ + if (net_passt_start_daemon(s, sv[1], errp) == -1) { + close(sv[0]); + close(sv[1]); + return -1; + } + close(sv[1]); + + return 0; +} + +#ifdef CONFIG_VHOST_USER +static gboolean passt_vhost_user_watch(void *do_not_use, GIOCondition cond, + void *opaque) +{ + NetPasstState *s = opaque; + + qemu_chr_fe_disconnect(&s->vhost_chr); + + return G_SOURCE_CONTINUE; +} + +static void passt_vhost_user_event(void *opaque, QEMUChrEvent event); + +static void chr_closed_bh(void *opaque) +{ + NetPasstState *s = opaque; + + passt_save_acked_features(&s->data.nc); + + net_client_set_link(&(NetClientState *){ &s->data.nc }, 1, false); + + qemu_chr_fe_set_handlers(&s->vhost_chr, NULL, NULL, passt_vhost_user_event, + NULL, s, NULL, true); +} + +static void passt_vhost_user_stop(NetPasstState *s) +{ + passt_save_acked_features(&s->data.nc); + vhost_net_cleanup(s->vhost_net); +} + +static int passt_vhost_user_start(NetPasstState *s, VhostUserState *be) +{ + struct vhost_net *net = NULL; + VhostNetOptions options; + + options.backend_type = VHOST_BACKEND_TYPE_USER; + options.net_backend = &s->data.nc; + options.opaque = be; + options.busyloop_timeout = 0; + options.nvqs = 2; + options.feature_bits = user_feature_bits; + options.max_tx_queue_size = VIRTQUEUE_MAX_SIZE; + options.get_acked_features = passt_get_acked_features; + options.save_acked_features = passt_save_acked_features; + options.is_vhost_user = true; + + net = vhost_net_init(&options); + if (!net) { + error_report("failed to init passt vhost_net"); + goto err; + } + + if (s->vhost_net) { + vhost_net_cleanup(s->vhost_net); + g_free(s->vhost_net); + } + s->vhost_net = net; + + return 0; +err: + if (net) { + vhost_net_cleanup(net); + g_free(net); + } + passt_vhost_user_stop(s); + return -1; +} + +static void passt_vhost_user_event(void *opaque, QEMUChrEvent event) +{ + NetPasstState *s = opaque; + Error *err = NULL; + + switch (event) { + case CHR_EVENT_OPENED: + if (passt_vhost_user_start(s, s->vhost_user) < 0) { + qemu_chr_fe_disconnect(&s->vhost_chr); + return; + } + s->vhost_watch = qemu_chr_fe_add_watch(&s->vhost_chr, G_IO_HUP, + passt_vhost_user_watch, s); + net_client_set_link(&(NetClientState *){ &s->data.nc }, 1, true); + s->started = true; + break; + case CHR_EVENT_CLOSED: + if (s->vhost_watch) { + AioContext *ctx = qemu_get_current_aio_context(); + + g_source_remove(s->vhost_watch); + s->vhost_watch = 0; + qemu_chr_fe_set_handlers(&s->vhost_chr, NULL, NULL, NULL, NULL, + NULL, NULL, false); + + aio_bh_schedule_oneshot(ctx, chr_closed_bh, s); + } + break; + case CHR_EVENT_BREAK: + case CHR_EVENT_MUX_IN: + case CHR_EVENT_MUX_OUT: + /* Ignore */ + break; + } + + if (err) { + error_report_err(err); + } +} + +static int net_passt_vhost_user_init(NetPasstState *s, Error **errp) +{ + Chardev *chr; + int sv[2]; + + if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) { + error_setg_errno(errp, errno, "socketpair() failed"); + return -1; + } + + /* connect to passt */ + qemu_set_info_str(&s->data.nc, "connecting to passt"); + + /* create chardev */ + + chr = CHARDEV(object_new(TYPE_CHARDEV_SOCKET)); + if (!chr || qemu_chr_add_client(chr, sv[0]) == -1) { + object_unref(OBJECT(chr)); + error_setg(errp, "Failed to make socket chardev"); + goto err; + } + + s->vhost_user = g_new0(struct VhostUserState, 1); + if (!qemu_chr_fe_init(&s->vhost_chr, chr, errp) || + !vhost_user_init(s->vhost_user, &s->vhost_chr, errp)) { + goto err; + } + + /* start passt */ + if (net_passt_start_daemon(s, sv[1], errp) == -1) { + goto err; + } + + do { + if (qemu_chr_fe_wait_connected(&s->vhost_chr, errp) < 0) { + goto err; + } + + qemu_chr_fe_set_handlers(&s->vhost_chr, NULL, NULL, + passt_vhost_user_event, NULL, s, NULL, + true); + } while (!s->started); + + qemu_set_info_str(&s->data.nc, "vhost-user,connected to pid %d", s->pid); + + close(sv[1]); + return 0; +err: + close(sv[0]); + close(sv[1]); + + return -1; +} +#else +static int net_passt_vhost_user_init(NetPasstState *s, Error **errp) +{ + error_setg(errp, "vhost-user support has not been built"); + + return -1; +} +#endif + +static GPtrArray *net_passt_decode_args(const NetDevPasstOptions *passt, + gchar *pidfile, Error **errp) +{ + GPtrArray *args = g_ptr_array_new_with_free_func(g_free); + + if (passt->path) { + g_ptr_array_add(args, g_strdup(passt->path)); + } else { + g_ptr_array_add(args, g_strdup("passt")); + } + + if (passt->has_vhost_user && passt->vhost_user) { + g_ptr_array_add(args, g_strdup("--vhost-user")); + } + + /* by default, be quiet */ + if (!passt->has_quiet || passt->quiet) { + g_ptr_array_add(args, g_strdup("--quiet")); + } + + if (passt->has_mtu) { + g_ptr_array_add(args, g_strdup("--mtu")); + g_ptr_array_add(args, g_strdup_printf("%"PRId64, passt->mtu)); + } + + if (passt->address) { + g_ptr_array_add(args, g_strdup("--address")); + g_ptr_array_add(args, g_strdup(passt->address)); + } + + if (passt->netmask) { + g_ptr_array_add(args, g_strdup("--netmask")); + g_ptr_array_add(args, g_strdup(passt->netmask)); + } + + if (passt->mac) { + g_ptr_array_add(args, g_strdup("--mac-addr")); + g_ptr_array_add(args, g_strdup(passt->mac)); + } + + if (passt->gateway) { + g_ptr_array_add(args, g_strdup("--gateway")); + g_ptr_array_add(args, g_strdup(passt->gateway)); + } + + if (passt->interface) { + g_ptr_array_add(args, g_strdup("--interface")); + g_ptr_array_add(args, g_strdup(passt->interface)); + } + + if (passt->outbound) { + g_ptr_array_add(args, g_strdup("--outbound")); + g_ptr_array_add(args, g_strdup(passt->outbound)); + } + + if (passt->outbound_if4) { + g_ptr_array_add(args, g_strdup("--outbound-if4")); + g_ptr_array_add(args, g_strdup(passt->outbound_if4)); + } + + if (passt->outbound_if6) { + g_ptr_array_add(args, g_strdup("--outbound-if6")); + g_ptr_array_add(args, g_strdup(passt->outbound_if6)); + } + + if (passt->dns) { + g_ptr_array_add(args, g_strdup("--dns")); + g_ptr_array_add(args, g_strdup(passt->dns)); + } + if (passt->fqdn) { + g_ptr_array_add(args, g_strdup("--fqdn")); + g_ptr_array_add(args, g_strdup(passt->fqdn)); + } + + if (passt->has_dhcp_dns && !passt->dhcp_dns) { + g_ptr_array_add(args, g_strdup("--no-dhcp-dns")); + } + + if (passt->has_dhcp_search && !passt->dhcp_search) { + g_ptr_array_add(args, g_strdup("--no-dhcp-search")); + } + + if (passt->map_host_loopback) { + g_ptr_array_add(args, g_strdup("--map-host-loopback")); + g_ptr_array_add(args, g_strdup(passt->map_host_loopback)); + } + + if (passt->map_guest_addr) { + g_ptr_array_add(args, g_strdup("--map-guest-addr")); + g_ptr_array_add(args, g_strdup(passt->map_guest_addr)); + } + + if (passt->dns_forward) { + g_ptr_array_add(args, g_strdup("--dns-forward")); + g_ptr_array_add(args, g_strdup(passt->dns_forward)); + } + + if (passt->dns_host) { + g_ptr_array_add(args, g_strdup("--dns-host")); + g_ptr_array_add(args, g_strdup(passt->dns_host)); + } + + if (passt->has_tcp && !passt->tcp) { + g_ptr_array_add(args, g_strdup("--no-tcp")); + } + + if (passt->has_udp && !passt->udp) { + g_ptr_array_add(args, g_strdup("--no-udp")); + } + + if (passt->has_icmp && !passt->icmp) { + g_ptr_array_add(args, g_strdup("--no-icmp")); + } + + if (passt->has_dhcp && !passt->dhcp) { + g_ptr_array_add(args, g_strdup("--no-dhcp")); + } + + if (passt->has_ndp && !passt->ndp) { + g_ptr_array_add(args, g_strdup("--no-ndp")); + } + if (passt->has_dhcpv6 && !passt->dhcpv6) { + g_ptr_array_add(args, g_strdup("--no-dhcpv6")); + } + + if (passt->has_ra && !passt->ra) { + g_ptr_array_add(args, g_strdup("--no-ra")); + } + + if (passt->has_freebind && passt->freebind) { + g_ptr_array_add(args, g_strdup("--freebind")); + } + + if (passt->has_ipv4 && !passt->ipv4) { + g_ptr_array_add(args, g_strdup("--ipv6-only")); + } + + if (passt->has_ipv6 && !passt->ipv6) { + g_ptr_array_add(args, g_strdup("--ipv4-only")); + } + + if (passt->has_search && passt->search) { + const StringList *list = passt->search; + GString *domains = g_string_new(list->value->str); + + list = list->next; + while (list) { + g_string_append(domains, " "); + g_string_append(domains, list->value->str); + list = list->next; + } + + g_ptr_array_add(args, g_strdup("--search")); + g_ptr_array_add(args, g_string_free(domains, FALSE)); + } + + if (passt->has_tcp_ports && passt->tcp_ports) { + const StringList *list = passt->tcp_ports; + GString *tcp_ports = g_string_new(list->value->str); + + list = list->next; + while (list) { + g_string_append(tcp_ports, ","); + g_string_append(tcp_ports, list->value->str); + list = list->next; + } + + g_ptr_array_add(args, g_strdup("--tcp-ports")); + g_ptr_array_add(args, g_string_free(tcp_ports, FALSE)); + } + + if (passt->has_udp_ports && passt->udp_ports) { + const StringList *list = passt->udp_ports; + GString *udp_ports = g_string_new(list->value->str); + + list = list->next; + while (list) { + g_string_append(udp_ports, ","); + g_string_append(udp_ports, list->value->str); + list = list->next; + } + + g_ptr_array_add(args, g_strdup("--udp-ports")); + g_ptr_array_add(args, g_string_free(udp_ports, FALSE)); + } + + if (passt->has_param && passt->param) { + const StringList *list = passt->param; + + while (list) { + g_ptr_array_add(args, g_strdup(list->value->str)); + list = list->next; + } + } + + /* provide a pid file to be able to kil passt on exit */ + g_ptr_array_add(args, g_strdup("--pid")); + g_ptr_array_add(args, g_strdup(pidfile)); + + /* g_subprocess_launcher_take_fd() will set the socket on fd 3 */ + g_ptr_array_add(args, g_strdup("--fd")); + g_ptr_array_add(args, g_strdup("3")); + + g_ptr_array_add(args, NULL); + + return args; +} + +int net_init_passt(const Netdev *netdev, const char *name, + NetClientState *peer, Error **errp) +{ + g_autoptr(GError) error = NULL; + NetClientState *nc; + NetPasstState *s; + GPtrArray *args; + gchar *pidfile; + int pidfd; + + assert(netdev->type == NET_CLIENT_DRIVER_PASST); + + pidfd = g_file_open_tmp("passt-XXXXXX.pid", &pidfile, &error); + if (pidfd == -1) { + error_setg(errp, "Failed to create temporary file: %s", error->message); + return -1; + } + close(pidfd); + + args = net_passt_decode_args(&netdev->u.passt, pidfile, errp); + if (args == NULL) { + g_free(pidfile); + return -1; + } + + nc = qemu_new_net_client(&net_passt_info, peer, "passt", name); + s = DO_UPCAST(NetPasstState, data.nc, nc); + + s->args = args; + s->pidfile = pidfile; + + if (netdev->u.passt.has_vhost_user && netdev->u.passt.vhost_user) { + if (net_passt_vhost_user_init(s, errp) == -1) { + qemu_del_net_client(nc); + return -1; + } + + return 0; + } + + if (net_passt_stream_start(s, errp) == -1) { + qemu_del_net_client(nc); + return -1; + } + + return 0; +} |