/* * QEMU System Emulator * * Copyright (c) 2003-2008 Fabrice Bellard * * 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 "net/net.h" #include "clients.h" #include "hub.h" #include "hw/qdev-properties.h" #include "net/slirp.h" #include "net/eth.h" #include "util.h" #include "monitor/monitor.h" #include "qemu/help_option.h" #include "qapi/qapi-commands-net.h" #include "qapi/qapi-visit-net.h" #include "qapi/qmp/qdict.h" #include "qapi/qmp/qerror.h" #include "qemu/error-report.h" #include "qemu/sockets.h" #include "qemu/cutils.h" #include "qemu/config-file.h" #include "qemu/ctype.h" #include "qemu/id.h" #include "qemu/iov.h" #include "qemu/qemu-print.h" #include "qemu/main-loop.h" #include "qemu/option.h" #include "qemu/keyval.h" #include "qapi/error.h" #include "qapi/opts-visitor.h" #include "sysemu/runstate.h" #include "net/colo-compare.h" #include "net/filter.h" #include "qapi/string-output-visitor.h" #include "qapi/qobject-input-visitor.h" #include "standard-headers/linux/virtio_net.h" /* Net bridge is currently not supported for W32. */ #if !defined(_WIN32) # define CONFIG_NET_BRIDGE #endif static VMChangeStateEntry *net_change_state_entry; NetClientStateList net_clients; typedef struct NetdevQueueEntry { Netdev *nd; Location loc; QSIMPLEQ_ENTRY(NetdevQueueEntry) entry; } NetdevQueueEntry; typedef QSIMPLEQ_HEAD(, NetdevQueueEntry) NetdevQueue; static NetdevQueue nd_queue = QSIMPLEQ_HEAD_INITIALIZER(nd_queue); static GHashTable *nic_model_help; static int nb_nics; static NICInfo nd_table[MAX_NICS]; /***********************************************************/ /* network device redirectors */ int convert_host_port(struct sockaddr_in *saddr, const char *host, const char *port, Error **errp) { struct hostent *he; const char *r; long p; memset(saddr, 0, sizeof(*saddr)); saddr->sin_family = AF_INET; if (host[0] == '\0') { saddr->sin_addr.s_addr = 0; } else { if (qemu_isdigit(host[0])) { if (!inet_aton(host, &saddr->sin_addr)) { error_setg(errp, "host address '%s' is not a valid " "IPv4 address", host); return -1; } } else { he = gethostbyname(host); if (he == NULL) { error_setg(errp, "can't resolve host address '%s'", host); return -1; } saddr->sin_addr = *(struct in_addr *)he->h_addr; } } if (qemu_strtol(port, &r, 0, &p) != 0) { error_setg(errp, "port number '%s' is invalid", port); return -1; } saddr->sin_port = htons(p); return 0; } int parse_host_port(struct sockaddr_in *saddr, const char *str, Error **errp) { gchar **substrings; int ret; substrings = g_strsplit(str, ":", 2); if (!substrings || !substrings[0] || !substrings[1]) { error_setg(errp, "host address '%s' doesn't contain ':' " "separating host from port", str); ret = -1; goto out; } ret = convert_host_port(saddr, substrings[0], substrings[1], errp); out: g_strfreev(substrings); return ret; } char *qemu_mac_strdup_printf(const uint8_t *macaddr) { return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4], macaddr[5]); } void qemu_set_info_str(NetClientState *nc, const char *fmt, ...) { va_list ap; va_start(ap, fmt); vsnprintf(nc->info_str, sizeof(nc->info_str), fmt, ap); va_end(ap); } void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) { qemu_set_info_str(nc, "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", nc->model, macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4], macaddr[5]); } static int mac_table[256] = {0}; static void qemu_macaddr_set_used(MACAddr *macaddr) { int index; for (index = 0x56; index < 0xFF; index++) { if (macaddr->a[5] == index) { mac_table[index]++; } } } static void qemu_macaddr_set_free(MACAddr *macaddr) { int index; static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { return; } for (index = 0x56; index < 0xFF; index++) { if (macaddr->a[5] == index) { mac_table[index]--; } } } static int qemu_macaddr_get_free(void) { int index; for (index = 0x56; index < 0xFF; index++) { if (mac_table[index] == 0) { return index; } } return -1; } void qemu_macaddr_default_if_unset(MACAddr *macaddr) { static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } }; if (memcmp(macaddr, &zero, sizeof(zero)) != 0) { if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) { return; } else { qemu_macaddr_set_used(macaddr); return; } } macaddr->a[0] = 0x52; macaddr->a[1] = 0x54; macaddr->a[2] = 0x00; macaddr->a[3] = 0x12; macaddr->a[4] = 0x34; macaddr->a[5] = qemu_macaddr_get_free(); qemu_macaddr_set_used(macaddr); } /** * Generate a name for net client * * Only net clients created with the legacy -net option and NICs need this. */ static char *assign_name(NetClientState *nc1, const char *model) { NetClientState *nc; int id = 0; QTAILQ_FOREACH(nc, &net_clients, next) { if (nc == nc1) { continue; } if (strcmp(nc->model, model) == 0) { id++; } } return g_strdup_printf("%s.%d", model, id); } static void qemu_net_client_destructor(NetClientState *nc) { g_free(nc); } static ssize_t qemu_deliver_packet_iov(NetClientState *sender, unsigned flags, const struct iovec *iov, int iovcnt, void *opaque); static void qemu_net_client_setup(NetClientState *nc, NetClientInfo *info, NetClientState *peer, const char *model, const char *name, NetClientDestructor *destructor, bool is_datapath) { nc->info = info; nc->model = g_strdup(model); if (name) { nc->name = g_strdup(name); } else { nc->name = assign_name(nc, model); } if (peer) { assert(!peer->peer); nc->peer = peer; peer->peer = nc; } QTAILQ_INSERT_TAIL(&net_clients, nc, next); nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc); nc->destructor = destructor; nc->is_datapath = is_datapath; QTAILQ_INIT(&nc->filters); } NetClientState *qemu_new_net_client(NetClientInfo *info, NetClientState *peer, const char *model, const char *name) { NetClientState *nc; assert(info->size >= sizeof(NetClientState)); nc = g_malloc0(info->size); qemu_net_client_setup(nc, info, peer, model, name, qemu_net_client_destructor, true); return nc; } NetClientState *qemu_new_net_control_client(NetClientInfo *info, NetClientState *peer, const char *model, const char *name) { NetClientState *nc; assert(info->size >= sizeof(NetClientState)); nc = g_malloc0(info->size); qemu_net_client_setup(nc, info, peer, model, name, qemu_net_client_destructor, false); return nc; } NICState *qemu_new_nic(NetClientInfo *info, NICConf *conf, const char *model, const char *name, MemReentrancyGuard *reentrancy_guard, void *opaque) { NetClientState **peers = conf->peers.ncs; NICState *nic; int i, queues = MAX(1, conf->peers.queues); assert(info->type == NET_CLIENT_DRIVER_NIC); assert(info->size >= sizeof(NICState)); nic = g_malloc0(info->size + sizeof(NetClientState) * queues); nic->ncs = (void *)nic + info->size; nic->conf = conf; nic->reentrancy_guard = reentrancy_guard, nic->opaque = opaque; for (i = 0; i < queues; i++) { qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, NULL, true); nic->ncs[i].queue_index = i; } return nic; } NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) { return nic->ncs + queue_index; } NetClientState *qemu_get_queue(NICState *nic) { return qemu_get_subqueue(nic, 0); } NICState *qemu_get_nic(NetClientState *nc) { NetClientState *nc0 = nc - nc->queue_index; return (NICState *)((void *)nc0 - nc->info->size); } void *qemu_get_nic_opaque(NetClientState *nc) { NICState *nic = qemu_get_nic(nc); return nic->opaque; } NetClientState *qemu_get_peer(NetClientState *nc, int queue_index) { assert(nc != NULL); NetClientState *ncs = nc + queue_index; return ncs->peer; } static void qemu_cleanup_net_client(NetClientState *nc) { QTAILQ_REMOVE(&net_clients, nc, next); if (nc->info->cleanup) { nc->info->cleanup(nc); } } static void qemu_free_net_client(NetClientState *nc) { if (nc->incoming_queue) { qemu_del_net_queue(nc->incoming_queue); } if (nc->peer) { nc->peer->peer = NULL; } g_free(nc->name); g_free(nc->model); if (nc->destructor) { nc->destructor(nc); } } void qemu_del_net_client(NetClientState *nc) { NetClientState *ncs[MAX_QUEUE_NUM]; int queues, i; NetFilterState *nf, *next; assert(nc->info->type != NET_CLIENT_DRIVER_NIC); /* If the NetClientState belongs to a multiqueue backend, we will change all * other NetClientStates also. */ queues = qemu_find_net_clients_except(nc->name, ncs, NET_CLIENT_DRIVER_NIC, MAX_QUEUE_NUM); assert(queues != 0); QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) { object_unparent(OBJECT(nf)); } /* If there is a peer NIC, delete and cleanup client, but do not free. */ if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { NICState *nic = qemu_get_nic(nc->peer); if (nic->peer_deleted) { return; } nic->peer_deleted = true; for (i = 0; i < queues; i++) { ncs[i]->peer->link_down = true; } if (nc->peer->info->link_status_changed) { nc->peer->info->link_status_changed(nc->peer); } for (i = 0; i < queues; i++) { qemu_cleanup_net_client(ncs[i]); } return; } for (i = 0; i < queues; i++) { qemu_cleanup_net_client(ncs[i]); qemu_free_net_client(ncs[i]); } } void qemu_del_nic(NICState *nic) { int i, queues = MAX(nic->conf->peers.queues, 1); qemu_macaddr_set_free(&nic->conf->macaddr); for (i = 0; i < queues; i++) { NetClientState *nc = qemu_get_subqueue(nic, i); /* If this is a peer NIC and peer has already been deleted, free it now. */ if (nic->peer_deleted) { qemu_free_net_client(nc->peer); } else if (nc->peer) { /* if there are RX packets pending, complete them */ qemu_purge_queued_packets(nc->peer); } } for (i = queues - 1; i >= 0; i--) { NetClientState *nc = qemu_get_subqueue(nic, i); qemu_cleanup_net_client(nc); qemu_free_net_client(nc); } g_free(nic); } void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) { NetClientState *nc; QTAILQ_FOREACH(nc, &net_clients, next) { if (nc->info->type == NET_CLIENT_DRIVER_NIC) { if (nc->queue_index == 0) { func(qemu_get_nic(nc), opaque); } } } } bool qemu_has_ufo(NetClientState *nc) { if (!nc || !nc->info->has_ufo) { return false; } return nc->info->has_ufo(nc); } bool qemu_has_uso(NetClientState *nc) { if (!nc || !nc->info->has_uso) { return false; } return nc->info->has_uso(nc); } bool qemu_has_vnet_hdr(NetClientState *nc) { if (!nc || !nc->info->has_vnet_hdr) { return false; } return nc->info->has_vnet_hdr(nc); } bool qemu_has_vnet_hdr_len(NetClientState *nc, int len) { if (!nc || !nc->info->has_vnet_hdr_len) { return false; } return nc->info->has_vnet_hdr_len(nc, len); } void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6, int ecn, int ufo, int uso4, int uso6) { if (!nc || !nc->info->set_offload) { return; } nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo, uso4, uso6); } int qemu_get_vnet_hdr_len(NetClientState *nc) { if (!nc) { return 0; } return nc->vnet_hdr_len; } void qemu_set_vnet_hdr_len(NetClientState *nc, int len) { if (!nc || !nc->info->set_vnet_hdr_len) { return; } assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) || len == sizeof(struct virtio_net_hdr) || len == sizeof(struct virtio_net_hdr_v1_hash)); nc->vnet_hdr_len = len; nc->info->set_vnet_hdr_len(nc, len); } int qemu_set_vnet_le(NetClientState *nc, bool is_le) { #if HOST_BIG_ENDIAN if (!nc || !nc->info->set_vnet_le) { return -ENOSYS; } return nc->info->set_vnet_le(nc, is_le); #else return 0; #endif } int qemu_set_vnet_be(NetClientState *nc, bool is_be) { #if HOST_BIG_ENDIAN return 0; #else if (!nc || !nc->info->set_vnet_be) { return -ENOSYS; } return nc->info->set_vnet_be(nc, is_be); #endif } int qemu_can_receive_packet(NetClientState *nc) { if (nc->receive_disabled) { return 0; } else if (nc->info->can_receive && !nc->info->can_receive(nc)) { return 0; } return 1; } int qemu_can_send_packet(NetClientState *sender) { int vm_running = runstate_is_running(); if (!vm_running) { return 0; } if (!sender->peer) { return 1; } return qemu_can_receive_packet(sender->peer); } static ssize_t filter_receive_iov(NetClientState *nc, NetFilterDirection direction, NetClientState *sender, unsigned flags, const struct iovec *iov, int iovcnt, NetPacketSent *sent_cb) { ssize_t ret = 0; NetFilterState *nf = NULL; if (direction == NET_FILTER_DIRECTION_TX) { QTAILQ_FOREACH(nf, &nc->filters, next) { ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, iovcnt, sent_cb); if (ret) { return ret; } } } else { QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) { ret = qemu_netfilter_receive(nf, direction, sender, flags, iov, iovcnt, sent_cb); if (ret) { return ret; } } } return ret; } static ssize_t filter_receive(NetClientState *nc, NetFilterDirection direction, NetClientState *sender, unsigned flags, const uint8_t *data, size_t size, NetPacketSent *sent_cb) { struct iovec iov = { .iov_base = (void *)data, .iov_len = size }; return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb); } void qemu_purge_queued_packets(NetClientState *nc) { if (!nc->peer) { return; } qemu_net_queue_purge(nc->peer->incoming_queue, nc); } void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge) { nc->receive_disabled = 0; if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) { if (net_hub_flush(nc->peer)) { qemu_notify_event(); } } if (qemu_net_queue_flush(nc->incoming_queue)) { /* We emptied the queue successfully, signal to the IO thread to repoll * the file descriptor (for tap, for example). */ qemu_notify_event(); } else if (purge) { /* Unable to empty the queue, purge remaining packets */ qemu_net_queue_purge(nc->incoming_queue, nc->peer); } } void qemu_flush_queued_packets(NetClientState *nc) { qemu_flush_or_purge_queued_packets(nc, false); } static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, unsigned flags, const uint8_t *buf, int size, NetPacketSent *sent_cb) { NetQueue *queue; int ret; #ifdef DEBUG_NET printf("qemu_send_packet_async:\n"); qemu_hexdump(stdout, "net", buf, size); #endif if (sender->link_down || !sender->peer) { return size; } /* Let filters handle the packet first */ ret = filter_receive(sender, NET_FILTER_DIRECTION_TX, sender, flags, buf, size, sent_cb); if (ret) { return ret; } ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX, sender, flags, buf, size, sent_cb); if (ret) { return ret; } queue = sender->peer->incoming_queue; return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb); } ssize_t qemu_send_packet_async(NetClientState *sender, const uint8_t *buf, int size, NetPacketSent *sent_cb) { return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE, buf, size, sent_cb); } ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) { return qemu_send_packet_async(nc, buf, size, NULL); } ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size) { if (!qemu_can_receive_packet(nc)) { return 0; } return qemu_net_queue_receive(nc->incoming_queue, buf, size); } ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size) { return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW, buf, size, NULL); } static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, int iovcnt, unsigned flags) { uint8_t *buf = NULL; uint8_t *buffer; size_t offset; ssize_t ret; if (iovcnt == 1) { buffer = iov[0].iov_base; offset = iov[0].iov_len; } else { offset = iov_size(iov, iovcnt); if (offset > NET_BUFSIZE) { return -1; } buf = g_malloc(offset); buffer = buf; offset = iov_to_buf(iov, iovcnt, 0, buf, offset); } ret = nc->info->receive(nc, buffer, offset); g_free(buf); return ret; } static ssize_t qemu_deliver_packet_iov(NetClientState *sender, unsigned flags, const struct iovec *iov, int iovcnt, void *opaque) { MemReentrancyGuard *owned_reentrancy_guard; NetClientState *nc = opaque; int ret; struct virtio_net_hdr_v1_hash vnet_hdr = { }; g_autofree struct iovec *iov_copy = NULL; if (nc->link_down) { return iov_size(iov, iovcnt); } if (nc->receive_disabled) { return 0; } if (nc->info->type != NET_CLIENT_DRIVER_NIC || qemu_get_nic(nc)->reentrancy_guard->engaged_in_io) { owned_reentrancy_guard = NULL; } else { owned_reentrancy_guard = qemu_get_nic(nc)->reentrancy_guard; owned_reentrancy_guard->engaged_in_io = true; } if ((flags & QEMU_NET_PACKET_FLAG_RAW) && nc->vnet_hdr_len) { iov_copy = g_new(struct iovec, iovcnt + 1); iov_copy[0].iov_base = &vnet_hdr; iov_copy[0].iov_len = nc->vnet_hdr_len; memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); iov = iov_copy; } if (nc->info->receive_iov) { ret = nc->info->receive_iov(nc, iov, iovcnt); } else { ret = nc_sendv_compat(nc, iov, iovcnt, flags); } if (owned_reentrancy_guard) { owned_reentrancy_guard->engaged_in_io = false; } if (ret == 0) { nc->receive_disabled = 1; } return ret; } ssize_t qemu_sendv_packet_async(NetClientState *sender, const struct iovec *iov, int iovcnt, NetPacketSent *sent_cb) { NetQueue *queue; size_t size = iov_size(iov, iovcnt); int ret; if (size > NET_BUFSIZE) { return size; } if (sender->link_down || !sender->peer) { return size; } /* Let filters handle the packet first */ ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender, QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); if (ret) { return ret; } ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender, QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); if (ret) { return ret; } queue = sender->peer->incoming_queue; return qemu_net_queue_send_iov(queue, sender, QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb); } ssize_t qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt) { return qemu_sendv_packet_async(nc, iov, iovcnt, NULL); } NetClientState *qemu_find_netdev(const char *id) { NetClientState *nc; QTAILQ_FOREACH(nc, &net_clients, next) { if (nc->info->type == NET_CLIENT_DRIVER_NIC) continue; if (!strcmp(nc->name, id)) { return nc; } } return NULL; } int qemu_find_net_clients_except(const char *id, NetClientState **ncs, NetClientDriver type, int max) { NetClientState *nc; int ret = 0; QTAILQ_FOREACH(nc, &net_clients, next) { if (nc->info->type == type) { continue; } if (!id || !strcmp(nc->name, id)) { if (ret < max) { ncs[ret] = nc; } ret++; } } return ret; } static int nic_get_free_idx(void) { int index; for (index = 0; index < MAX_NICS; index++) if (!nd_table[index].used) return index; return -1; } GPtrArray *qemu_get_nic_models(const char *device_type) { GPtrArray *nic_models = g_ptr_array_new(); GSList *list = object_class_get_list_sorted(device_type, false); while (list) { DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, list->data, TYPE_DEVICE); GSList *next; if (test_bit(DEVICE_CATEGORY_NETWORK, dc->categories) && dc->user_creatable) { const char *name = object_class_get_name(list->data); /* * A network device might also be something else than a NIC, see * e.g. the "rocker" device. Thus we have to look for the "netdev" * property, too. Unfortunately, some devices like virtio-net only * create this property during instance_init, so we have to create * a temporary instance here to be able to check it. */ Object *obj = object_new_with_class(OBJECT_CLASS(dc)); if (object_property_find(obj, "netdev")) { g_ptr_array_add(nic_models, (gpointer)name); } object_unref(obj); } next = list->next; g_slist_free_1(list); list = next; } g_ptr_array_add(nic_models, NULL); return nic_models; } static int net_init_nic(const Netdev *netdev, const char *name, NetClientState *peer, Error **errp) { int idx; NICInfo *nd; const NetLegacyNicOptions *nic; assert(netdev->type == NET_CLIENT_DRIVER_NIC); nic = &netdev->u.nic; idx = nic_get_free_idx(); if (idx == -1 || nb_nics >= MAX_NICS) { error_setg(errp, "too many NICs"); return -1; } nd = &nd_table[idx]; memset(nd, 0, sizeof(*nd)); if (nic->netdev) { nd->netdev = qemu_find_netdev(nic->netdev); if (!nd->netdev) { error_setg(errp, "netdev '%s' not found", nic->netdev); return -1; } } else { assert(peer); nd->netdev = peer; } nd->name = g_strdup(name); if (nic->model) { nd->model = g_strdup(nic->model); } if (nic->addr) { nd->devaddr = g_strdup(nic->addr); } if (nic->macaddr && net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { error_setg(errp, "invalid syntax for ethernet address"); return -1; } if (nic->macaddr && is_multicast_ether_addr(nd->macaddr.a)) { error_setg(errp, "NIC cannot have multicast MAC address (odd 1st byte)"); return -1; } qemu_macaddr_default_if_unset(&nd->macaddr); if (nic->has_vectors) { if (nic->vectors > 0x7ffffff) { error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors); return -1; } nd->nvectors = nic->vectors; } else { nd->nvectors = DEV_NVECTORS_UNSPECIFIED; } nd->used = 1; nb_nics++; return idx; } static gboolean add_nic_result(gpointer key, gpointer value, gpointer user_data) { GPtrArray *results = user_data; GPtrArray *alias_list = value; const char *model = key; char *result; if (!alias_list) { result = g_strdup(model); } else { GString *result_str = g_string_new(model); int i; g_string_append(result_str, " (aka "); for (i = 0; i < alias_list->len; i++) { if (i) { g_string_append(result_str, ", "); } g_string_append(result_str, alias_list->pdata[i]); } g_string_append(result_str, ")"); result = result_str->str; g_string_free(result_str, false); g_ptr_array_unref(alias_list); } g_ptr_array_add(results, result); return true; } static int model_cmp(char **a, char **b) { return strcmp(*a, *b); } static void show_nic_models(void) { GPtrArray *results = g_ptr_array_new(); int i; g_hash_table_foreach_remove(nic_model_help, add_nic_result, results); g_ptr_array_sort(results, (GCompareFunc)model_cmp); printf("Available NIC models for this configuration:\n"); for (i = 0 ; i < results->len; i++) { printf("%s\n", (char *)results->pdata[i]); } g_hash_table_unref(nic_model_help); nic_model_help = NULL; } static void add_nic_model_help(const char *model, const char *alias) { GPtrArray *alias_list = NULL; if (g_hash_table_lookup_extended(nic_model_help, model, NULL, (gpointer *)&alias_list)) { /* Already exists, no alias to add: return */ if (!alias) { return; } if (alias_list) { /* Check if this alias is already in the list. Add if not. */ if (!g_ptr_array_find_with_equal_func(alias_list, alias, g_str_equal, NULL)) { g_ptr_array_add(alias_list, g_strdup(alias)); } return; } } /* Either this model wasn't in the list already, or a first alias added */ if (alias) { alias_list = g_ptr_array_new(); g_ptr_array_set_free_func(alias_list, g_free); g_ptr_array_add(alias_list, g_strdup(alias)); } g_hash_table_replace(nic_model_help, g_strdup(model), alias_list); } NICInfo *qemu_find_nic_info(const char *typename, bool match_default, const char *alias) { NICInfo *nd; int i; if (nic_model_help) { add_nic_model_help(typename, alias); } for (i = 0; i < nb_nics; i++) { nd = &nd_table[i]; if (!nd->used || nd->instantiated) { continue; } if ((match_default && !nd->model) || !g_strcmp0(nd->model, typename) || (alias && !g_strcmp0(nd->model, alias))) { return nd; } } return NULL; } static bool is_nic_model_help_option(const char *model) { if (model && is_help_option(model)) { /* * Trigger the help output by instantiating the hash table which * will gather tha available models as they get registered. */ if (!nic_model_help) { nic_model_help = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL); } return true; } return false; } /* "I have created a device. Please configure it if you can" */ bool qemu_configure_nic_device(DeviceState *dev, bool match_default, const char *alias) { NICInfo *nd = qemu_find_nic_info(object_get_typename(OBJECT(dev)), match_default, alias); if (nd) { qdev_set_nic_properties(dev, nd); return true; } return false; } /* "Please create a device, if you have a configuration for it" */ DeviceState *qemu_create_nic_device(const char *typename, bool match_default, const char *alias) { NICInfo *nd = qemu_find_nic_info(typename, match_default, alias); DeviceState *dev; if (!nd) { return NULL; } dev = qdev_new(typename); qdev_set_nic_properties(dev, nd); return dev; } void qemu_create_nic_bus_devices(BusState *bus, const char *parent_type, const char *default_model, const char *alias, const char *alias_target) { GPtrArray *nic_models = qemu_get_nic_models(parent_type); const char *model; DeviceState *dev; NICInfo *nd; int i; if (nic_model_help) { if (alias_target) { add_nic_model_help(alias_target, alias); } for (i = 0; i < nic_models->len - 1; i++) { add_nic_model_help(nic_models->pdata[i], NULL); } } /* Drop the NULL terminator which would make g_str_equal() unhappy */ nic_models->len--; for (i = 0; i < nb_nics; i++) { nd = &nd_table[i]; if (!nd->used || nd->instantiated) { continue; } model = nd->model ? nd->model : default_model; if (!model) { continue; } /* Each bus type is allowed *one* substitution */ if (g_str_equal(model, alias)) { model = alias_target; } if (!g_ptr_array_find_with_equal_func(nic_models, model, g_str_equal, NULL)) { /* This NIC does not live on this bus. */ continue; } dev = qdev_new(model); qdev_set_nic_properties(dev, nd); qdev_realize_and_unref(dev, bus, &error_fatal); } g_ptr_array_free(nic_models, true); } static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])( const Netdev *netdev, const char *name, NetClientState *peer, Error **errp) = { [NET_CLIENT_DRIVER_NIC] = net_init_nic, #ifdef CONFIG_SLIRP [NET_CLIENT_DRIVER_USER] = net_init_slirp, #endif [NET_CLIENT_DRIVER_TAP] = net_init_tap, [NET_CLIENT_DRIVER_SOCKET] = net_init_socket, [NET_CLIENT_DRIVER_STREAM] = net_init_stream, [NET_CLIENT_DRIVER_DGRAM] = net_init_dgram, #ifdef CONFIG_VDE [NET_CLIENT_DRIVER_VDE] = net_init_vde, #endif #ifdef CONFIG_NETMAP [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap, #endif #ifdef CONFIG_AF_XDP [NET_CLIENT_DRIVER_AF_XDP] = net_init_af_xdp, #endif #ifdef CONFIG_NET_BRIDGE [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge, #endif [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport, #ifdef CONFIG_VHOST_NET_USER [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user, #endif #ifdef CONFIG_VHOST_NET_VDPA [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa, #endif #ifdef CONFIG_L2TPV3 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3, #endif #ifdef CONFIG_VMNET [NET_CLIENT_DRIVER_VMNET_HOST] = net_init_vmnet_host, [NET_CLIENT_DRIVER_VMNET_SHARED] = net_init_vmnet_shared, [NET_CLIENT_DRIVER_VMNET_BRIDGED] = net_init_vmnet_bridged, #endif /* CONFIG_VMNET */ }; static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp) { NetClientState *peer = NULL; NetClientState *nc; if (is_netdev) { if (netdev->type == NET_CLIENT_DRIVER_NIC || !net_client_init_fun[netdev->type]) { error_setg(errp, "network backend '%s' is not compiled into this binary", NetClientDriver_str(netdev->type)); return -1; } } else { if (netdev->type == NET_CLIENT_DRIVER_NONE) { return 0; /* nothing to do */ } if (netdev->type == NET_CLIENT_DRIVER_HUBPORT) { error_setg(errp, "network backend '%s' is only supported with -netdev/-nic", NetClientDriver_str(netdev->type)); return -1; } if (!net_client_init_fun[netdev->type]) { error_setg(errp, "network backend '%s' is not compiled into this binary", NetClientDriver_str(netdev->type)); return -1; } /* Do not add to a hub if it's a nic with a netdev= parameter. */ if (netdev->type != NET_CLIENT_DRIVER_NIC || !netdev->u.nic.netdev) { peer = net_hub_add_port(0, NULL, NULL); } } nc = qemu_find_netdev(netdev->id); if (nc) { error_setg(errp, "Duplicate ID '%s'", netdev->id); return -1; } if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) { /* FIXME drop when all init functions store an Error */ if (errp && !*errp) { error_setg(errp, "Device '%s' could not be initialized", NetClientDriver_str(netdev->type)); } return -1; } if (is_netdev) { nc = qemu_find_netdev(netdev->id); assert(nc); nc->is_netdev = true; } return 0; } void show_netdevs(void) { int idx; const char *available_netdevs[] = { "socket", "stream", "dgram", "hubport", "tap", #ifdef CONFIG_SLIRP "user", #endif #ifdef CONFIG_L2TPV3 "l2tpv3", #endif #ifdef CONFIG_VDE "vde", #endif #ifdef CONFIG_NET_BRIDGE "bridge", #endif #ifdef CONFIG_NETMAP "netmap", #endif #ifdef CONFIG_AF_XDP "af-xdp", #endif #ifdef CONFIG_POSIX "vhost-user", #endif #ifdef CONFIG_VHOST_VDPA "vhost-vdpa", #endif #ifdef CONFIG_VMNET "vmnet-host", "vmnet-shared", "vmnet-bridged", #endif }; qemu_printf("Available netdev backend types:\n"); for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) { qemu_printf("%s\n", available_netdevs[idx]); } } static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) { gchar **substrings = NULL; Netdev *object = NULL; int ret = -1; Visitor *v = opts_visitor_new(opts); /* Parse convenience option format ipv6-net=fec0::0[/64] */ const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); if (ip6_net) { char *prefix_addr; unsigned long prefix_len = 64; /* Default 64bit prefix length. */ substrings = g_strsplit(ip6_net, "/", 2); if (!substrings || !substrings[0]) { error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net", "a valid IPv6 prefix"); goto out; } prefix_addr = substrings[0]; /* Handle user-specified prefix length. */ if (substrings[1] && qemu_strtoul(substrings[1], NULL, 10, &prefix_len)) { error_setg(errp, "parameter 'ipv6-net' expects a number after '/'"); goto out; } qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort); qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len, &error_abort); qemu_opt_unset(opts, "ipv6-net"); } /* Create an ID for -net if the user did not specify one */ if (!is_netdev && !qemu_opts_id(opts)) { qemu_opts_set_id(opts, id_generate(ID_NET)); } if (visit_type_Netdev(v, NULL, &object, errp)) { ret = net_client_init1(object, is_netdev, errp); } qapi_free_Netdev(object); out: g_strfreev(substrings); visit_free(v); return ret; } void netdev_add(QemuOpts *opts, Error **errp) { net_client_init(opts, true, errp); } void qmp_netdev_add(Netdev *netdev, Error **errp) { if (!id_wellformed(netdev->id)) { error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier"); return; } net_client_init1(netdev, true, errp); } void qmp_netdev_del(const char *id, Error **errp) { NetClientState *nc; QemuOpts *opts; nc = qemu_find_netdev(id); if (!nc) { error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, "Device '%s' not found", id); return; } if (!nc->is_netdev) { error_setg(errp, "Device '%s' is not a netdev", id); return; } qemu_del_net_client(nc); /* * Wart: we need to delete the QemuOpts associated with netdevs * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in * HMP netdev_add. */ opts = qemu_opts_find(qemu_find_opts("netdev"), id); if (opts) { qemu_opts_del(opts); } } static void netfilter_print_info(Monitor *mon, NetFilterState *nf) { char *str; ObjectProperty *prop; ObjectPropertyIterator iter; Visitor *v; /* generate info str */ object_property_iter_init(&iter, OBJECT(nf)); while ((prop = object_property_iter_next(&iter))) { if (!strcmp(prop->name, "type")) { continue; } v = string_output_visitor_new(false, &str); object_property_get(OBJECT(nf), prop->name, v, NULL); visit_complete(v, &str); visit_free(v); monitor_printf(mon, ",%s=%s", prop->name, str); g_free(str); } monitor_printf(mon, "\n"); } void print_net_client(Monitor *mon, NetClientState *nc) { NetFilterState *nf; monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name, nc->queue_index, NetClientDriver_str(nc->info->type), nc->info_str); if (!QTAILQ_EMPTY(&nc->filters)) { monitor_printf(mon, "filters:\n"); } QTAILQ_FOREACH(nf, &nc->filters, next) { monitor_printf(mon, " - %s: type=%s", object_get_canonical_path_component(OBJECT(nf)), object_get_typename(OBJECT(nf))); netfilter_print_info(mon, nf); } } RxFilterInfoList *qmp_query_rx_filter(const char *name, Error **errp) { NetClientState *nc; RxFilterInfoList *filter_list = NULL, **tail = &filter_list; QTAILQ_FOREACH(nc, &net_clients, next) { RxFilterInfo *info; if (name && strcmp(nc->name, name) != 0) { continue; } /* only query rx-filter information of NIC */ if (nc->info->type != NET_CLIENT_DRIVER_NIC) { if (name) { error_setg(errp, "net client(%s) isn't a NIC", name); assert(!filter_list); return NULL; } continue; } /* only query information on queue 0 since the info is per nic, * not per queue */ if (nc->queue_index != 0) continue; if (nc->info->query_rx_filter) { info = nc->info->query_rx_filter(nc); QAPI_LIST_APPEND(tail, info); } else if (name) { error_setg(errp, "net client(%s) doesn't support" " rx-filter querying", name); assert(!filter_list); return NULL; } if (name) { break; } } if (filter_list == NULL && name) { error_setg(errp, "invalid net client name: %s", name); } return filter_list; } void colo_notify_filters_event(int event, Error **errp) { NetClientState *nc; NetFilterState *nf; NetFilterClass *nfc = NULL; Error *local_err = NULL; QTAILQ_FOREACH(nc, &net_clients, next) { QTAILQ_FOREACH(nf, &nc->filters, next) { nfc = NETFILTER_GET_CLASS(OBJECT(nf)); nfc->handle_event(nf, event, &local_err); if (local_err) { error_propagate(errp, local_err); return; } } } } void qmp_set_link(const char *name, bool up, Error **errp) { NetClientState *ncs[MAX_QUEUE_NUM]; NetClientState *nc; int queues, i; queues = qemu_find_net_clients_except(name, ncs, NET_CLIENT_DRIVER__MAX, MAX_QUEUE_NUM); if (queues == 0) { error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, "Device '%s' not found", name); return; } nc = ncs[0]; for (i = 0; i < queues; i++) { ncs[i]->link_down = !up; } if (nc->info->link_status_changed) { nc->info->link_status_changed(nc); } if (nc->peer) { /* Change peer link only if the peer is NIC and then notify peer. * If the peer is a HUBPORT or a backend, we do not change the * link status. * * This behavior is compatible with qemu hubs where there could be * multiple clients that can still communicate with each other in * disconnected mode. For now maintain this compatibility. */ if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { for (i = 0; i < queues; i++) { ncs[i]->peer->link_down = !up; } } if (nc->peer->info->link_status_changed) { nc->peer->info->link_status_changed(nc->peer); } } } static void net_vm_change_state_handler(void *opaque, bool running, RunState state) { NetClientState *nc; NetClientState *tmp; QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) { if (running) { /* Flush queued packets and wake up backends. */ if (nc->peer && qemu_can_send_packet(nc)) { qemu_flush_queued_packets(nc->peer); } } else { /* Complete all queued packets, to guarantee we don't modify * state later when VM is not running. */ qemu_flush_or_purge_queued_packets(nc, true); } } } void net_cleanup(void) { NetClientState *nc, **p = &QTAILQ_FIRST(&net_clients); /*cleanup colo compare module for COLO*/ colo_compare_cleanup(); /* * Walk the net_clients list and remove the netdevs but *not* any * NET_CLIENT_DRIVER_NIC entries. The latter are owned by the device * model which created them, and in some cases (e.g. xen-net-device) * the device itself may do cleanup at exit and will be upset if we * just delete its NIC from underneath it. * * Since qemu_del_net_client() may delete multiple entries, using * QTAILQ_FOREACH_SAFE() is not safe here. The only safe pointer * to keep as a bookmark is a NET_CLIENT_DRIVER_NIC entry, so keep * 'p' pointing to either the head of the list, or the 'next' field * of the latest NET_CLIENT_DRIVER_NIC, and operate on *p as we walk * the list. * * The 'nc' variable isn't part of the list traversal; it's purely * for convenience as too much '(*p)->' has a tendency to make the * readers' eyes bleed. */ while (*p) { nc = *p; if (nc->info->type == NET_CLIENT_DRIVER_NIC) { /* Skip NET_CLIENT_DRIVER_NIC entries */ p = &QTAILQ_NEXT(nc, next); } else { qemu_del_net_client(nc); } } qemu_del_vm_change_state_handler(net_change_state_entry); } void net_check_clients(void) { NetClientState *nc; int i; if (nic_model_help) { show_nic_models(); exit(0); } net_hub_check_clients(); QTAILQ_FOREACH(nc, &net_clients, next) { if (!nc->peer) { warn_report("%s %s has no peer", nc->info->type == NET_CLIENT_DRIVER_NIC ? "nic" : "netdev", nc->name); } } /* Check that all NICs requested via -net nic actually got created. * NICs created via -device don't need to be checked here because * they are always instantiated. */ for (i = 0; i < MAX_NICS; i++) { NICInfo *nd = &nd_table[i]; if (nd->used && !nd->instantiated) { warn_report("requested NIC (%s, model %s) " "was not created (not supported by this machine?)", nd->name ? nd->name : "anonymous", nd->model ? nd->model : "unspecified"); } } } static int net_init_client(void *dummy, QemuOpts *opts, Error **errp) { const char *model = qemu_opt_get(opts, "model"); if (is_nic_model_help_option(model)) { return 0; } return net_client_init(opts, false, errp); } static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp) { const char *type = qemu_opt_get(opts, "type"); if (type && is_help_option(type)) { show_netdevs(); exit(0); } return net_client_init(opts, true, errp); } /* For the convenience "--nic" parameter */ static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp) { char *mac, *nd_id; int idx, ret; NICInfo *ni; const char *type; type = qemu_opt_get(opts, "type"); if (type) { if (g_str_equal(type, "none")) { return 0; /* Nothing to do, default_net is cleared in vl.c */ } if (is_help_option(type)) { GPtrArray *nic_models = qemu_get_nic_models(TYPE_DEVICE); int i; show_netdevs(); printf("\n"); printf("Available NIC models " "(use -nic model=help for a filtered list):\n"); for (i = 0 ; nic_models->pdata[i]; i++) { printf("%s\n", (char *)nic_models->pdata[i]); } g_ptr_array_free(nic_models, true); exit(0); } } idx = nic_get_free_idx(); if (idx == -1 || nb_nics >= MAX_NICS) { error_setg(errp, "no more on-board/default NIC slots available"); return -1; } if (!type) { qemu_opt_set(opts, "type", "user", &error_abort); } ni = &nd_table[idx]; memset(ni, 0, sizeof(*ni)); ni->model = qemu_opt_get_del(opts, "model"); if (is_nic_model_help_option(ni->model)) { return 0; } /* Create an ID if the user did not specify one */ nd_id = g_strdup(qemu_opts_id(opts)); if (!nd_id) { nd_id = id_generate(ID_NET); qemu_opts_set_id(opts, nd_id); } /* Handle MAC address */ mac = qemu_opt_get_del(opts, "mac"); if (mac) { ret = net_parse_macaddr(ni->macaddr.a, mac); g_free(mac); if (ret) { error_setg(errp, "invalid syntax for ethernet address"); goto out; } if (is_multicast_ether_addr(ni->macaddr.a)) { error_setg(errp, "NIC cannot have multicast MAC address"); ret = -1; goto out; } } qemu_macaddr_default_if_unset(&ni->macaddr); ret = net_client_init(opts, true, errp); if (ret == 0) { ni->netdev = qemu_find_netdev(nd_id); ni->used = true; nb_nics++; } out: g_free(nd_id); return ret; } static void netdev_init_modern(void) { while (!QSIMPLEQ_EMPTY(&nd_queue)) { NetdevQueueEntry *nd = QSIMPLEQ_FIRST(&nd_queue); QSIMPLEQ_REMOVE_HEAD(&nd_queue, entry); loc_push_restore(&nd->loc); net_client_init1(nd->nd, true, &error_fatal); loc_pop(&nd->loc); qapi_free_Netdev(nd->nd); g_free(nd); } } void net_init_clients(void) { net_change_state_entry = qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL); QTAILQ_INIT(&net_clients); netdev_init_modern(); qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, &error_fatal); qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, &error_fatal); qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, &error_fatal); } /* * Does this -netdev argument use modern rather than traditional syntax? * Modern syntax is to be parsed with netdev_parse_modern(). * Traditional syntax is to be parsed with net_client_parse(). */ bool netdev_is_modern(const char *optstr) { QemuOpts *opts; bool is_modern; const char *type; static QemuOptsList dummy_opts = { .name = "netdev", .implied_opt_name = "type", .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), .desc = { { } }, }; if (optstr[0] == '{') { /* This is JSON, which means it's modern syntax */ return true; } opts = qemu_opts_create(&dummy_opts, NULL, false, &error_abort); qemu_opts_do_parse(opts, optstr, dummy_opts.implied_opt_name, &error_abort); type = qemu_opt_get(opts, "type"); is_modern = !g_strcmp0(type, "stream") || !g_strcmp0(type, "dgram"); qemu_opts_reset(&dummy_opts); return is_modern; } /* * netdev_parse_modern() uses modern, more expressive syntax than * net_client_parse(), but supports only the -netdev option. * netdev_parse_modern() appends to @nd_queue, whereas net_client_parse() * appends to @qemu_netdev_opts. */ void netdev_parse_modern(const char *optstr) { Visitor *v; NetdevQueueEntry *nd; v = qobject_input_visitor_new_str(optstr, "type", &error_fatal); nd = g_new(NetdevQueueEntry, 1); visit_type_Netdev(v, NULL, &nd->nd, &error_fatal); visit_free(v); loc_save(&nd->loc); QSIMPLEQ_INSERT_TAIL(&nd_queue, nd, entry); } void net_client_parse(QemuOptsList *opts_list, const char *optstr) { if (!qemu_opts_parse_noisily(opts_list, optstr, true)) { exit(1); } } /* From FreeBSD */ /* XXX: optimize */ uint32_t net_crc32(const uint8_t *p, int len) { uint32_t crc; int carry, i, j; uint8_t b; crc = 0xffffffff; for (i = 0; i < len; i++) { b = *p++; for (j = 0; j < 8; j++) { carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); crc <<= 1; b >>= 1; if (carry) { crc = ((crc ^ POLYNOMIAL_BE) | carry); } } } return crc; } uint32_t net_crc32_le(const uint8_t *p, int len) { uint32_t crc; int carry, i, j; uint8_t b; crc = 0xffffffff; for (i = 0; i < len; i++) { b = *p++; for (j = 0; j < 8; j++) { carry = (crc & 0x1) ^ (b & 0x01); crc >>= 1; b >>= 1; if (carry) { crc ^= POLYNOMIAL_LE; } } } return crc; } QemuOptsList qemu_netdev_opts = { .name = "netdev", .implied_opt_name = "type", .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head), .desc = { /* * no elements => accept any params * validation will happen later */ { /* end of list */ } }, }; QemuOptsList qemu_nic_opts = { .name = "nic", .implied_opt_name = "type", .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head), .desc = { /* * no elements => accept any params * validation will happen later */ { /* end of list */ } }, }; QemuOptsList qemu_net_opts = { .name = "net", .implied_opt_name = "type", .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head), .desc = { /* * no elements => accept any params * validation will happen later */ { /* end of list */ } }, }; void net_socket_rs_init(SocketReadState *rs, SocketReadStateFinalize *finalize, bool vnet_hdr) { rs->state = 0; rs->vnet_hdr = vnet_hdr; rs->index = 0; rs->packet_len = 0; rs->vnet_hdr_len = 0; memset(rs->buf, 0, sizeof(rs->buf)); rs->finalize = finalize; } /* * Returns * 0: success * -1: error occurs */ int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size) { unsigned int l; while (size > 0) { /* Reassemble a packet from the network. * 0 = getting length. * 1 = getting vnet header length. * 2 = getting data. */ switch (rs->state) { case 0: l = 4 - rs->index; if (l > size) { l = size; } memcpy(rs->buf + rs->index, buf, l); buf += l; size -= l; rs->index += l; if (rs->index == 4) { /* got length */ rs->packet_len = ntohl(*(uint32_t *)rs->buf); rs->index = 0; if (rs->vnet_hdr) { rs->state = 1; } else { rs->state = 2; rs->vnet_hdr_len = 0; } } break; case 1: l = 4 - rs->index; if (l > size) { l = size; } memcpy(rs->buf + rs->index, buf, l); buf += l; size -= l; rs->index += l; if (rs->index == 4) { /* got vnet header length */ rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf); rs->index = 0; rs->state = 2; } break; case 2: l = rs->packet_len - rs->index; if (l > size) { l = size; } if (rs->index + l <= sizeof(rs->buf)) { memcpy(rs->buf + rs->index, buf, l); } else { fprintf(stderr, "serious error: oversized packet received," "connection terminated.\n"); rs->index = rs->state = 0; return -1; } rs->index += l; buf += l; size -= l; if (rs->index >= rs->packet_len) { rs->index = 0; rs->state = 0; assert(rs->finalize); rs->finalize(rs); } break; } } assert(size == 0); return 0; }