Archipelago » qemu

/*

 * 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 "net.h"

#include "config-host.h"

#include "net/tap.h"

#include "net/socket.h"

#include "net/dump.h"

#include "net/slirp.h"

#include "net/vde.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(, VLANState) vlans;

static QTAILQ_HEAD(, VLANClientState) non_vlan_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(VLANClientState *vc, uint8_t macaddr[6])

{

    snprintf(vc->info_str, sizeof(vc->info_str),

             "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",

             vc->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++;

}

static char *assign_name(VLANClientState *vc1, const char *model)

{

    VLANState *vlan;

    VLANClientState *vc;

    char buf[256];

    int id = 0;

    QTAILQ_FOREACH(vlan, &vlans, next) {

        QTAILQ_FOREACH(vc, &vlan->clients, next) {

            if (vc != vc1 && strcmp(vc->model, model) == 0) {

                id++;

            }

        }

    }

    QTAILQ_FOREACH(vc, &non_vlan_clients, next) {

        if (vc != vc1 && strcmp(vc->model, model) == 0) {

            id++;

        }

    }

    snprintf(buf, sizeof(buf), "%s.%d", model, id);

    return g_strdup(buf);

}

static ssize_t qemu_deliver_packet(VLANClientState *sender,

                                   unsigned flags,

                                   const uint8_t *data,

                                   size_t size,

                                   void *opaque);

static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,

                                       unsigned flags,

                                       const struct iovec *iov,

                                       int iovcnt,

                                       void *opaque);

VLANClientState *qemu_new_net_client(NetClientInfo *info,

                                     VLANState *vlan,

                                     VLANClientState *peer,

                                     const char *model,

                                     const char *name)

{

    VLANClientState *vc;

    assert(info->size >= sizeof(VLANClientState));

    vc = g_malloc0(info->size);

    vc->info = info;

    vc->model = g_strdup(model);

    if (name) {

        vc->name = g_strdup(name);

    } else {

        vc->name = assign_name(vc, model);

    }

    if (vlan) {

        assert(!peer);

        vc->vlan = vlan;

        QTAILQ_INSERT_TAIL(&vc->vlan->clients, vc, next);

    } else {

        if (peer) {

            assert(!peer->peer);

            vc->peer = peer;

            peer->peer = vc;

        }

        QTAILQ_INSERT_TAIL(&non_vlan_clients, vc, next);

        vc->send_queue = qemu_new_net_queue(qemu_deliver_packet,

                                            qemu_deliver_packet_iov,

                                            vc);

    }

    return vc;

}

NICState *qemu_new_nic(NetClientInfo *info,

                       NICConf *conf,

                       const char *model,

                       const char *name,

                       void *opaque)

{

    VLANClientState *nc;

    NICState *nic;

    assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);

    assert(info->size >= sizeof(NICState));

    nc = qemu_new_net_client(info, conf->vlan, conf->peer, model, name);

    nic = DO_UPCAST(NICState, nc, nc);

    nic->conf = conf;

    nic->opaque = opaque;

    return nic;

}

static void qemu_cleanup_vlan_client(VLANClientState *vc)

{

    if (vc->vlan) {

        QTAILQ_REMOVE(&vc->vlan->clients, vc, next);

    } else {

        QTAILQ_REMOVE(&non_vlan_clients, vc, next);

    }

    if (vc->info->cleanup) {

        vc->info->cleanup(vc);

    }

}

static void qemu_free_vlan_client(VLANClientState *vc)

{

    if (!vc->vlan) {

        if (vc->send_queue) {

            qemu_del_net_queue(vc->send_queue);

        }

        if (vc->peer) {

            vc->peer->peer = NULL;

        }

    }

    g_free(vc->name);

    g_free(vc->model);

    g_free(vc);

}

void qemu_del_vlan_client(VLANClientState *vc)

{

    /* If there is a peer NIC, delete and cleanup client, but do not free. */

    if (!vc->vlan && vc->peer && vc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {

        NICState *nic = DO_UPCAST(NICState, nc, vc->peer);

        if (nic->peer_deleted) {

            return;

        }

        nic->peer_deleted = true;

        /* Let NIC know peer is gone. */

        vc->peer->link_down = true;

        if (vc->peer->info->link_status_changed) {

            vc->peer->info->link_status_changed(vc->peer);

        }

        qemu_cleanup_vlan_client(vc);

        return;

    }

    /* If this is a peer NIC and peer has already been deleted, free it now. */

    if (!vc->vlan && vc->peer && vc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {

        NICState *nic = DO_UPCAST(NICState, nc, vc);

        if (nic->peer_deleted) {

            qemu_free_vlan_client(vc->peer);

        }

    }

    qemu_cleanup_vlan_client(vc);

    qemu_free_vlan_client(vc);

}

VLANClientState *

qemu_find_vlan_client_by_name(Monitor *mon, int vlan_id,

                              const char *client_str)

{

    VLANState *vlan;

    VLANClientState *vc;

    vlan = qemu_find_vlan(vlan_id, 0);

    if (!vlan) {

        monitor_printf(mon, "unknown VLAN %d\n", vlan_id);

        return NULL;

    }

    QTAILQ_FOREACH(vc, &vlan->clients, next) {

        if (!strcmp(vc->name, client_str)) {

            break;

        }

    }

    if (!vc) {

        monitor_printf(mon, "can't find device %s on VLAN %d\n",

                       client_str, vlan_id);

    }

    return vc;

}

void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)

{

    VLANClientState *nc;

    VLANState *vlan;

    QTAILQ_FOREACH(nc, &non_vlan_clients, next) {

        if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {

            func(DO_UPCAST(NICState, nc, nc), opaque);

        }

    }

    QTAILQ_FOREACH(vlan, &vlans, next) {

        QTAILQ_FOREACH(nc, &vlan->clients, next) {

            if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {

                func(DO_UPCAST(NICState, nc, nc), opaque);

            }

        }

    }

}

int qemu_can_send_packet(VLANClientState *sender)

{

    VLANState *vlan = sender->vlan;

    VLANClientState *vc;

    if (sender->peer) {

        if (sender->peer->receive_disabled) {

            return 0;

        } else if (sender->peer->info->can_receive &&

                   !sender->peer->info->can_receive(sender->peer)) {

            return 0;

        } else {

            return 1;

        }

    }

    if (!sender->vlan) {

        return 1;

    }

    QTAILQ_FOREACH(vc, &vlan->clients, next) {

        if (vc == sender) {

            continue;

        }

        /* no can_receive() handler, they can always receive */

        if (vc->info->can_receive && !vc->info->can_receive(vc)) {

            return 0;

        }

    }

    return 1;

}

static ssize_t qemu_deliver_packet(VLANClientState *sender,

                                   unsigned flags,

                                   const uint8_t *data,

                                   size_t size,

                                   void *opaque)

{

    VLANClientState *vc = opaque;

    ssize_t ret;

    if (vc->link_down) {

        return size;

    }

    if (vc->receive_disabled) {

        return 0;

    }

    if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {

        ret = vc->info->receive_raw(vc, data, size);

    } else {

        ret = vc->info->receive(vc, data, size);

    }

    if (ret == 0) {

        vc->receive_disabled = 1;

    };

    return ret;

}

static ssize_t qemu_vlan_deliver_packet(VLANClientState *sender,

                                        unsigned flags,

                                        const uint8_t *buf,

                                        size_t size,

                                        void *opaque)

{

    VLANState *vlan = opaque;

    VLANClientState *vc;

    ssize_t ret = -1;

    QTAILQ_FOREACH(vc, &vlan->clients, next) {

        ssize_t len;

        if (vc == sender) {

            continue;

        }

        if (vc->link_down) {

            ret = size;

            continue;

        }

        if (vc->receive_disabled) {

            ret = 0;

            continue;

        }

        if (flags & QEMU_NET_PACKET_FLAG_RAW && vc->info->receive_raw) {

            len = vc->info->receive_raw(vc, buf, size);

        } else {

            len = vc->info->receive(vc, buf, size);

        }

        if (len == 0) {

            vc->receive_disabled = 1;

        }

        ret = (ret >= 0) ? ret : len;

    }

    return ret;

}

void qemu_purge_queued_packets(VLANClientState *vc)

{

    NetQueue *queue;

    if (!vc->peer && !vc->vlan) {

        return;

    }

    if (vc->peer) {

        queue = vc->peer->send_queue;

    } else {

        queue = vc->vlan->send_queue;

    }

    qemu_net_queue_purge(queue, vc);

}

void qemu_flush_queued_packets(VLANClientState *vc)

{

    NetQueue *queue;

    vc->receive_disabled = 0;

    if (vc->vlan) {

        queue = vc->vlan->send_queue;

    } else {

        queue = vc->send_queue;

    }

    qemu_net_queue_flush(queue);

}

static ssize_t qemu_send_packet_async_with_flags(VLANClientState *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 && !sender->vlan)) {

        return size;

    }

    if (sender->peer) {

        queue = sender->peer->send_queue;

    } else {

        queue = sender->vlan->send_queue;

    }

    return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);

}

ssize_t qemu_send_packet_async(VLANClientState *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(VLANClientState *vc, const uint8_t *buf, int size)

{

    qemu_send_packet_async(vc, buf, size, NULL);

}

ssize_t qemu_send_packet_raw(VLANClientState *vc, const uint8_t *buf, int size)

{

    return qemu_send_packet_async_with_flags(vc, QEMU_NET_PACKET_FLAG_RAW,

                                             buf, size, NULL);

}

static ssize_t vc_sendv_compat(VLANClientState *vc, const struct iovec *iov,

                               int iovcnt)

{

    uint8_t buffer[4096];

    size_t offset;

    offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));

    return vc->info->receive(vc, buffer, offset);

}

static ssize_t qemu_deliver_packet_iov(VLANClientState *sender,

                                       unsigned flags,

                                       const struct iovec *iov,

                                       int iovcnt,

                                       void *opaque)

{

    VLANClientState *vc = opaque;

    if (vc->link_down) {

        return iov_size(iov, iovcnt);

    }

    if (vc->info->receive_iov) {

        return vc->info->receive_iov(vc, iov, iovcnt);

    } else {

        return vc_sendv_compat(vc, iov, iovcnt);

    }

}

static ssize_t qemu_vlan_deliver_packet_iov(VLANClientState *sender,

                                            unsigned flags,

                                            const struct iovec *iov,

                                            int iovcnt,

                                            void *opaque)

{

    VLANState *vlan = opaque;

    VLANClientState *vc;

    ssize_t ret = -1;

    QTAILQ_FOREACH(vc, &vlan->clients, next) {

        ssize_t len;

        if (vc == sender) {

            continue;

        }

        if (vc->link_down) {

            ret = iov_size(iov, iovcnt);

            continue;

        }

        assert(!(flags & QEMU_NET_PACKET_FLAG_RAW));

        if (vc->info->receive_iov) {

            len = vc->info->receive_iov(vc, iov, iovcnt);

        } else {

            len = vc_sendv_compat(vc, iov, iovcnt);

        }

        ret = (ret >= 0) ? ret : len;

    }

    return ret;

}

ssize_t qemu_sendv_packet_async(VLANClientState *sender,

                                const struct iovec *iov, int iovcnt,

                                NetPacketSent *sent_cb)

{

    NetQueue *queue;

    if (sender->link_down || (!sender->peer && !sender->vlan)) {

        return iov_size(iov, iovcnt);

    }

    if (sender->peer) {

        queue = sender->peer->send_queue;

    } else {

        queue = sender->vlan->send_queue;

    }

    return qemu_net_queue_send_iov(queue, sender,

                                   QEMU_NET_PACKET_FLAG_NONE,

                                   iov, iovcnt, sent_cb);

}

ssize_t

qemu_sendv_packet(VLANClientState *vc, const struct iovec *iov, int iovcnt)

{

    return qemu_sendv_packet_async(vc, iov, iovcnt, NULL);

}

/* find or alloc a new VLAN */

VLANState *qemu_find_vlan(int id, int allocate)

{

    VLANState *vlan;

    QTAILQ_FOREACH(vlan, &vlans, next) {

        if (vlan->id == id) {

            return vlan;

        }

    }

    if (!allocate) {

        return NULL;

    }

    vlan = g_malloc0(sizeof(VLANState));

    vlan->id = id;

    QTAILQ_INIT(&vlan->clients);

    vlan->send_queue = qemu_new_net_queue(qemu_vlan_deliver_packet,

                                          qemu_vlan_deliver_packet_iov,

                                          vlan);

    QTAILQ_INSERT_TAIL(&vlans, vlan, next);

    return vlan;

}

VLANClientState *qemu_find_netdev(const char *id)

{

    VLANClientState *vc;

    QTAILQ_FOREACH(vc, &non_vlan_clients, next) {

        if (vc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)

            continue;

        if (!strcmp(vc->name, id)) {

            return vc;

        }

    }

    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 || strcmp(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;

}

int net_handle_fd_param(Monitor *mon, const char *param)

{

    int fd;

    if (!qemu_isdigit(param[0]) && mon) {

        fd = monitor_get_fd(mon, param);

        if (fd == -1) {

            error_report("No file descriptor named %s found", param);

            return -1;

        }

    } else {

        fd = qemu_parse_fd(param);

    }

    return fd;

}

static int net_init_nic(const NetClientOptions *opts, const char *name,

                        VLANState *vlan)

{

    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(vlan);

        nd->vlan = vlan;

    }

    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,

    VLANState *vlan) = {

        [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

};

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

            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]) {

        VLANState *vlan = 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)) {

            vlan = qemu_find_vlan(u.net->has_vlan ? u.net->vlan : 0, true);

        }

        if (net_client_init_fun[opts->kind](opts, name, vlan) < 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)

{

    VLANClientState *vc;

    int vlan_id = qdict_get_int(qdict, "vlan_id");

    const char *device = qdict_get_str(qdict, "device");

    vc = qemu_find_vlan_client_by_name(mon, vlan_id, device);

    if (!vc) {

        return;

    }

    if (!net_host_check_device(vc->model)) {

        monitor_printf(mon, "invalid host network device %s\n", device);

        return;

    }

    qemu_del_vlan_client(vc);

}

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)

{

    VLANClientState *vc;

    vc = qemu_find_netdev(id);

    if (!vc) {

        error_set(errp, QERR_DEVICE_NOT_FOUND, id);

        return;

    }

    qemu_del_vlan_client(vc);

    qemu_opts_del(qemu_opts_find(qemu_find_opts_err("netdev", errp), id));

}

static void print_net_client(Monitor *mon, VLANClientState *vc)

{

    monitor_printf(mon, "%s: type=%s,%s\n", vc->name,

                   NetClientOptionsKind_lookup[vc->info->type], vc->info_str);

}

void do_info_network(Monitor *mon)

{

    VLANState *vlan;

    VLANClientState *vc, *peer;

    NetClientOptionsKind type;

    QTAILQ_FOREACH(vlan, &vlans, next) {

        monitor_printf(mon, "VLAN %d devices:\n", vlan->id);

        QTAILQ_FOREACH(vc, &vlan->clients, next) {

            monitor_printf(mon, "  ");

            print_net_client(mon, vc);

        }

    }

    monitor_printf(mon, "Devices not on any VLAN:\n");

    QTAILQ_FOREACH(vc, &non_vlan_clients, next) {

        peer = vc->peer;

        type = vc->info->type;

        if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {

            monitor_printf(mon, "  ");

            print_net_client(mon, vc);

        } /* 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)

{

    VLANState *vlan;

    VLANClientState *vc = NULL;

    QTAILQ_FOREACH(vlan, &vlans, next) {

        QTAILQ_FOREACH(vc, &vlan->clients, next) {

            if (strcmp(vc->name, name) == 0) {

                goto done;

            }

        }

    }

    QTAILQ_FOREACH(vc, &non_vlan_clients, next) {

        if (!strcmp(vc->name, name)) {

            goto done;

        }

    }

done:

    if (!vc) {

        error_set(errp, QERR_DEVICE_NOT_FOUND, name);

        return;

    }

    vc->link_down = !up;

    if (vc->info->link_status_changed) {

        vc->info->link_status_changed(vc);

    }

    /* 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 (vc->peer && vc->peer->info->link_status_changed) {

        vc->peer->info->link_status_changed(vc->peer);

    }

}

void net_cleanup(void)

{

    VLANState *vlan;

    VLANClientState *vc, *next_vc;

    QTAILQ_FOREACH(vlan, &vlans, next) {

        QTAILQ_FOREACH_SAFE(vc, &vlan->clients, next, next_vc) {

            qemu_del_vlan_client(vc);

        }

    }

    QTAILQ_FOREACH_SAFE(vc, &non_vlan_clients, next, next_vc) {

        qemu_del_vlan_client(vc);

    }

}

void net_check_clients(void)

{

    VLANState *vlan;

    VLANClientState *vc;

    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;

    }

    QTAILQ_FOREACH(vlan, &vlans, next) {

        int has_nic = 0, has_host_dev = 0;

        QTAILQ_FOREACH(vc, &vlan->clients, next) {

            switch (vc->info->type) {

            case NET_CLIENT_OPTIONS_KIND_NIC:

                has_nic = 1;

                break;

            case NET_CLIENT_OPTIONS_KIND_USER:

            case NET_CLIENT_OPTIONS_KIND_TAP:

            case NET_CLIENT_OPTIONS_KIND_SOCKET:

            case NET_CLIENT_OPTIONS_KIND_VDE:

                has_host_dev = 1;

                break;

            default: ;

            }

        }

        if (has_host_dev && !has_nic)

            fprintf(stderr, "Warning: vlan %d with no nics\n", vlan->id);

        if (has_nic && !has_host_dev)

            fprintf(stderr,

                    "Warning: vlan %d is not connected to host network\n",

                    vlan->id);

    }

    QTAILQ_FOREACH(vc, &non_vlan_clients, next) {

        if (!vc->peer) {

            fprintf(stderr, "Warning: %s %s has no peer\n",

                    vc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ? "nic" : "netdev",

                    vc->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(&vlans);

    QTAILQ_INIT(&non_vlan_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;

}