/* * 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 "config-host.h" #include "net.h" #include "net/clients.h" #include "net/hub.h" #include "net/slirp.h" #include "net/util.h" #include "monitor.h" #include "qemu-common.h" #include "qemu_socket.h" #include "qmp-commands.h" #include "hw/qdev.h" #include "iov.h" #include "qapi-visit.h" #include "qapi/opts-visitor.h" #include "qapi/qapi-dealloc-visitor.h" /* Net bridge is currently not supported for W32. */ #if !defined(_WIN32) # define CONFIG_NET_BRIDGE #endif static QTAILQ_HEAD(, NetClientState) net_clients; int default_net = 1; /***********************************************************/ /* network device redirectors */ #if defined(DEBUG_NET) static void hex_dump(FILE *f, const uint8_t *buf, int size) { int len, i, j, c; for(i=0;i<size;i+=16) { len = size - i; if (len > 16) len = 16; fprintf(f, "%08x ", i); for(j=0;j<16;j++) { if (j < len) fprintf(f, " %02x", buf[i+j]); else fprintf(f, " "); } fprintf(f, " "); for(j=0;j<len;j++) { c = buf[i+j]; if (c < ' ' || c > '~') c = '.'; fprintf(f, "%c", c); } fprintf(f, "\n"); } } #endif static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) { const char *p, *p1; int len; p = *pp; p1 = strchr(p, sep); if (!p1) return -1; len = p1 - p; p1++; if (buf_size > 0) { if (len > buf_size - 1) len = buf_size - 1; memcpy(buf, p, len); buf[len] = '\0'; } *pp = p1; return 0; } int parse_host_port(struct sockaddr_in *saddr, const char *str) { char buf[512]; struct hostent *he; const char *p, *r; int port; p = str; if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) return -1; saddr->sin_family = AF_INET; if (buf[0] == '\0') { saddr->sin_addr.s_addr = 0; } else { if (qemu_isdigit(buf[0])) { if (!inet_aton(buf, &saddr->sin_addr)) return -1; } else { if ((he = gethostbyname(buf)) == NULL) return - 1; saddr->sin_addr = *(struct in_addr *)he->h_addr; } } port = strtol(p, (char **)&r, 0); if (r == p) return -1; saddr->sin_port = htons(port); return 0; } void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6]) { snprintf(nc->info_str, sizeof(nc->info_str), "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x", nc->model, macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4], macaddr[5]); } void qemu_macaddr_default_if_unset(MACAddr *macaddr) { static int index = 0; static const MACAddr zero = { .a = { 0,0,0,0,0,0 } }; if (memcmp(macaddr, &zero, sizeof(zero)) != 0) return; macaddr->a[0] = 0x52; macaddr->a[1] = 0x54; macaddr->a[2] = 0x00; macaddr->a[3] = 0x12; macaddr->a[4] = 0x34; macaddr->a[5] = 0x56 + index++; } /** * Generate a name for net client * * Only net clients created with the legacy -net option need this. Naming is * mandatory for net clients created with -netdev. */ static char *assign_name(NetClientState *nc1, const char *model) { NetClientState *nc; char buf[256]; int id = 0; QTAILQ_FOREACH(nc, &net_clients, next) { if (nc == nc1) { continue; } /* For compatibility only bump id for net clients on a vlan */ if (strcmp(nc->model, model) == 0 && net_hub_id_for_client(nc, NULL) == 0) { id++; } } snprintf(buf, sizeof(buf), "%s.%d", model, id); return g_strdup(buf); } 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); 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->send_queue = qemu_new_net_queue(nc); return nc; } NICState *qemu_new_nic(NetClientInfo *info, NICConf *conf, const char *model, const char *name, void *opaque) { NetClientState *nc; NICState *nic; assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC); assert(info->size >= sizeof(NICState)); nc = qemu_new_net_client(info, conf->peer, model, name); nic = DO_UPCAST(NICState, nc, nc); nic->conf = conf; nic->opaque = opaque; return nic; } 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->send_queue) { qemu_del_net_queue(nc->send_queue); } if (nc->peer) { nc->peer->peer = NULL; } g_free(nc->name); g_free(nc->model); g_free(nc); } void qemu_del_net_client(NetClientState *nc) { /* If there is a peer NIC, delete and cleanup client, but do not free. */ if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { NICState *nic = DO_UPCAST(NICState, nc, nc->peer); if (nic->peer_deleted) { return; } nic->peer_deleted = true; /* Let NIC know peer is gone. */ nc->peer->link_down = true; if (nc->peer->info->link_status_changed) { nc->peer->info->link_status_changed(nc->peer); } qemu_cleanup_net_client(nc); return; } /* If this is a peer NIC and peer has already been deleted, free it now. */ if (nc->peer && nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { NICState *nic = DO_UPCAST(NICState, nc, nc); if (nic->peer_deleted) { qemu_free_net_client(nc->peer); } } qemu_cleanup_net_client(nc); qemu_free_net_client(nc); } void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) { NetClientState *nc; QTAILQ_FOREACH(nc, &net_clients, next) { if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) { func(DO_UPCAST(NICState, nc, nc), opaque); } } } int qemu_can_send_packet(NetClientState *sender) { if (!sender->peer) { return 1; } if (sender->peer->receive_disabled) { return 0; } else if (sender->peer->info->can_receive && !sender->peer->info->can_receive(sender->peer)) { return 0; } return 1; } ssize_t qemu_deliver_packet(NetClientState *sender, unsigned flags, const uint8_t *data, size_t size, void *opaque) { NetClientState *nc = opaque; ssize_t ret; if (nc->link_down) { return size; } if (nc->receive_disabled) { return 0; } if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) { ret = nc->info->receive_raw(nc, data, size); } else { ret = nc->info->receive(nc, data, size); } if (ret == 0) { nc->receive_disabled = 1; }; return ret; } void qemu_purge_queued_packets(NetClientState *nc) { if (!nc->peer) { return; } qemu_net_queue_purge(nc->peer->send_queue, nc); } void qemu_flush_queued_packets(NetClientState *nc) { nc->receive_disabled = 0; if (qemu_net_queue_flush(nc->send_queue)) { /* We emptied the queue successfully, signal to the IO thread to repoll * the file descriptor (for tap, for example). */ qemu_notify_event(); } } static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender, unsigned flags, const uint8_t *buf, int size, NetPacketSent *sent_cb) { NetQueue *queue; #ifdef DEBUG_NET printf("qemu_send_packet_async:\n"); hex_dump(stdout, buf, size); #endif if (sender->link_down || !sender->peer) { return size; } queue = sender->peer->send_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); } void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size) { qemu_send_packet_async(nc, buf, size, NULL); } 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) { uint8_t buffer[4096]; size_t offset; offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer)); return nc->info->receive(nc, buffer, offset); } ssize_t qemu_deliver_packet_iov(NetClientState *sender, unsigned flags, const struct iovec *iov, int iovcnt, void *opaque) { NetClientState *nc = opaque; int ret; if (nc->link_down) { return iov_size(iov, iovcnt); } if (nc->receive_disabled) { return 0; } if (nc->info->receive_iov) { ret = nc->info->receive_iov(nc, iov, iovcnt); } else { ret = nc_sendv_compat(nc, iov, iovcnt); } 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; if (sender->link_down || !sender->peer) { return iov_size(iov, iovcnt); } queue = sender->peer->send_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_OPTIONS_KIND_NIC) continue; if (!strcmp(nc->name, id)) { return nc; } } return NULL; } 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; } int qemu_show_nic_models(const char *arg, const char *const *models) { int i; if (!arg || !is_help_option(arg)) { return 0; } fprintf(stderr, "qemu: Supported NIC models: "); for (i = 0 ; models[i]; i++) fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n'); return 1; } void qemu_check_nic_model(NICInfo *nd, const char *model) { const char *models[2]; models[0] = model; models[1] = NULL; if (qemu_show_nic_models(nd->model, models)) exit(0); if (qemu_find_nic_model(nd, models, model) < 0) exit(1); } int qemu_find_nic_model(NICInfo *nd, const char * const *models, const char *default_model) { int i; if (!nd->model) nd->model = g_strdup(default_model); for (i = 0 ; models[i]; i++) { if (strcmp(nd->model, models[i]) == 0) return i; } error_report("Unsupported NIC model: %s", nd->model); return -1; } static int net_init_nic(const NetClientOptions *opts, const char *name, NetClientState *peer) { int idx; NICInfo *nd; const NetLegacyNicOptions *nic; assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC); nic = opts->nic; idx = nic_get_free_idx(); if (idx == -1 || nb_nics >= MAX_NICS) { error_report("Too Many NICs"); return -1; } nd = &nd_table[idx]; memset(nd, 0, sizeof(*nd)); if (nic->has_netdev) { nd->netdev = qemu_find_netdev(nic->netdev); if (!nd->netdev) { error_report("netdev '%s' not found", nic->netdev); return -1; } } else { assert(peer); nd->netdev = peer; } if (name) { nd->name = g_strdup(name); } if (nic->has_model) { nd->model = g_strdup(nic->model); } if (nic->has_addr) { nd->devaddr = g_strdup(nic->addr); } if (nic->has_macaddr && net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) { error_report("invalid syntax for ethernet address"); return -1; } qemu_macaddr_default_if_unset(&nd->macaddr); if (nic->has_vectors) { if (nic->vectors > 0x7ffffff) { error_report("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 int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])( const NetClientOptions *opts, const char *name, NetClientState *peer) = { [NET_CLIENT_OPTIONS_KIND_NIC] = net_init_nic, #ifdef CONFIG_SLIRP [NET_CLIENT_OPTIONS_KIND_USER] = net_init_slirp, #endif [NET_CLIENT_OPTIONS_KIND_TAP] = net_init_tap, [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket, #ifdef CONFIG_VDE [NET_CLIENT_OPTIONS_KIND_VDE] = net_init_vde, #endif [NET_CLIENT_OPTIONS_KIND_DUMP] = net_init_dump, #ifdef CONFIG_NET_BRIDGE [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge, #endif [NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport, }; static int net_client_init1(const void *object, int is_netdev, Error **errp) { union { const Netdev *netdev; const NetLegacy *net; } u; const NetClientOptions *opts; const char *name; if (is_netdev) { u.netdev = object; opts = u.netdev->opts; name = u.netdev->id; switch (opts->kind) { #ifdef CONFIG_SLIRP case NET_CLIENT_OPTIONS_KIND_USER: #endif case NET_CLIENT_OPTIONS_KIND_TAP: case NET_CLIENT_OPTIONS_KIND_SOCKET: #ifdef CONFIG_VDE case NET_CLIENT_OPTIONS_KIND_VDE: #endif #ifdef CONFIG_NET_BRIDGE case NET_CLIENT_OPTIONS_KIND_BRIDGE: #endif case NET_CLIENT_OPTIONS_KIND_HUBPORT: break; default: error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type", "a netdev backend type"); return -1; } } else { u.net = object; opts = u.net->opts; /* missing optional values have been initialized to "all bits zero" */ name = u.net->has_id ? u.net->id : u.net->name; } if (net_client_init_fun[opts->kind]) { NetClientState *peer = NULL; /* Do not add to a vlan if it's a -netdev or a nic with a netdev= * parameter. */ if (!is_netdev && (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC || !opts->nic->has_netdev)) { peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL); } if (net_client_init_fun[opts->kind](opts, name, peer) < 0) { /* TODO push error reporting into init() methods */ error_set(errp, QERR_DEVICE_INIT_FAILED, NetClientOptionsKind_lookup[opts->kind]); return -1; } } return 0; } static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp) { if (is_netdev) { visit_type_Netdev(v, (Netdev **)object, NULL, errp); } else { visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp); } } int net_client_init(QemuOpts *opts, int is_netdev, Error **errp) { void *object = NULL; Error *err = NULL; int ret = -1; { OptsVisitor *ov = opts_visitor_new(opts); net_visit(opts_get_visitor(ov), is_netdev, &object, &err); opts_visitor_cleanup(ov); } if (!err) { ret = net_client_init1(object, is_netdev, &err); } if (object) { QapiDeallocVisitor *dv = qapi_dealloc_visitor_new(); net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL); qapi_dealloc_visitor_cleanup(dv); } error_propagate(errp, err); return ret; } static int net_host_check_device(const char *device) { int i; const char *valid_param_list[] = { "tap", "socket", "dump" #ifdef CONFIG_NET_BRIDGE , "bridge" #endif #ifdef CONFIG_SLIRP ,"user" #endif #ifdef CONFIG_VDE ,"vde" #endif }; for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) { if (!strncmp(valid_param_list[i], device, strlen(valid_param_list[i]))) return 1; } return 0; } void net_host_device_add(Monitor *mon, const QDict *qdict) { const char *device = qdict_get_str(qdict, "device"); const char *opts_str = qdict_get_try_str(qdict, "opts"); Error *local_err = NULL; QemuOpts *opts; if (!net_host_check_device(device)) { monitor_printf(mon, "invalid host network device %s\n", device); return; } opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0); if (!opts) { return; } qemu_opt_set(opts, "type", device); net_client_init(opts, 0, &local_err); if (error_is_set(&local_err)) { qerror_report_err(local_err); error_free(local_err); monitor_printf(mon, "adding host network device %s failed\n", device); } } void net_host_device_remove(Monitor *mon, const QDict *qdict) { NetClientState *nc; int vlan_id = qdict_get_int(qdict, "vlan_id"); const char *device = qdict_get_str(qdict, "device"); nc = net_hub_find_client_by_name(vlan_id, device); if (!nc) { return; } if (!net_host_check_device(nc->model)) { monitor_printf(mon, "invalid host network device %s\n", device); return; } qemu_del_net_client(nc); } void netdev_add(QemuOpts *opts, Error **errp) { net_client_init(opts, 1, errp); } int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret) { Error *local_err = NULL; QemuOptsList *opts_list; QemuOpts *opts; opts_list = qemu_find_opts_err("netdev", &local_err); if (error_is_set(&local_err)) { goto exit_err; } opts = qemu_opts_from_qdict(opts_list, qdict, &local_err); if (error_is_set(&local_err)) { goto exit_err; } netdev_add(opts, &local_err); if (error_is_set(&local_err)) { qemu_opts_del(opts); goto exit_err; } return 0; exit_err: qerror_report_err(local_err); error_free(local_err); return -1; } void qmp_netdev_del(const char *id, Error **errp) { NetClientState *nc; QemuOpts *opts; nc = qemu_find_netdev(id); if (!nc) { error_set(errp, QERR_DEVICE_NOT_FOUND, id); return; } opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id); if (!opts) { error_setg(errp, "Device '%s' is not a netdev", id); return; } qemu_del_net_client(nc); qemu_opts_del(opts); } void print_net_client(Monitor *mon, NetClientState *nc) { monitor_printf(mon, "%s: type=%s,%s\n", nc->name, NetClientOptionsKind_lookup[nc->info->type], nc->info_str); } void do_info_network(Monitor *mon) { NetClientState *nc, *peer; NetClientOptionsKind type; net_hub_info(mon); QTAILQ_FOREACH(nc, &net_clients, next) { peer = nc->peer; type = nc->info->type; /* Skip if already printed in hub info */ if (net_hub_id_for_client(nc, NULL) == 0) { continue; } if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) { print_net_client(mon, nc); } /* else it's a netdev connected to a NIC, printed with the NIC */ if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) { monitor_printf(mon, " \\ "); print_net_client(mon, peer); } } } void qmp_set_link(const char *name, bool up, Error **errp) { NetClientState *nc = NULL; QTAILQ_FOREACH(nc, &net_clients, next) { if (!strcmp(nc->name, name)) { goto done; } } done: if (!nc) { error_set(errp, QERR_DEVICE_NOT_FOUND, name); return; } nc->link_down = !up; if (nc->info->link_status_changed) { nc->info->link_status_changed(nc); } /* Notify peer. Don't update peer link status: this makes it possible to * disconnect from host network without notifying the guest. * FIXME: is disconnected link status change operation useful? * * Current behaviour is compatible with qemu vlans where there could be * multiple clients that can still communicate with each other in * disconnected mode. For now maintain this compatibility. */ if (nc->peer && nc->peer->info->link_status_changed) { nc->peer->info->link_status_changed(nc->peer); } } void net_cleanup(void) { NetClientState *nc, *next_vc; QTAILQ_FOREACH_SAFE(nc, &net_clients, next, next_vc) { qemu_del_net_client(nc); } } void net_check_clients(void) { NetClientState *nc; int i; /* Don't warn about the default network setup that you get if * no command line -net or -netdev options are specified. There * are two cases that we would otherwise complain about: * (1) board doesn't support a NIC but the implicit "-net nic" * requested one * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic" * sets up a nic that isn't connected to anything. */ if (default_net) { return; } net_hub_check_clients(); QTAILQ_FOREACH(nc, &net_clients, next) { if (!nc->peer) { fprintf(stderr, "Warning: %s %s has no peer\n", nc->info->type == NET_CLIENT_OPTIONS_KIND_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) { fprintf(stderr, "Warning: requested NIC (%s, model %s) " "was not created (not supported by this machine?)\n", nd->name ? nd->name : "anonymous", nd->model ? nd->model : "unspecified"); } } } static int net_init_client(QemuOpts *opts, void *dummy) { Error *local_err = NULL; net_client_init(opts, 0, &local_err); if (error_is_set(&local_err)) { qerror_report_err(local_err); error_free(local_err); return -1; } return 0; } static int net_init_netdev(QemuOpts *opts, void *dummy) { Error *local_err = NULL; int ret; ret = net_client_init(opts, 1, &local_err); if (error_is_set(&local_err)) { qerror_report_err(local_err); error_free(local_err); return -1; } return ret; } int net_init_clients(void) { QemuOptsList *net = qemu_find_opts("net"); if (default_net) { /* if no clients, we use a default config */ qemu_opts_set(net, NULL, "type", "nic"); #ifdef CONFIG_SLIRP qemu_opts_set(net, NULL, "type", "user"); #endif } QTAILQ_INIT(&net_clients); if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1) return -1; if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) { return -1; } return 0; } int net_client_parse(QemuOptsList *opts_list, const char *optarg) { #if defined(CONFIG_SLIRP) int ret; if (net_slirp_parse_legacy(opts_list, optarg, &ret)) { return ret; } #endif if (!qemu_opts_parse(opts_list, optarg, 1)) { return -1; } default_net = 0; return 0; } /* From FreeBSD */ /* XXX: optimize */ unsigned compute_mcast_idx(const uint8_t *ep) { uint32_t crc; int carry, i, j; uint8_t b; crc = 0xffffffff; for (i = 0; i < 6; i++) { b = *ep++; for (j = 0; j < 8; j++) { carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01); crc <<= 1; b >>= 1; if (carry) { crc = ((crc ^ POLYNOMIAL) | carry); } } } return crc >> 26; }