xref: /openbmc/qemu/net/vmnet-bridged.m (revision 2e35439f) 
1/*
2 * vmnet-bridged.m
3 *
4 * Copyright(c) 2022 Vladislav Yaroshchuk <vladislav.yaroshchuk@jetbrains.com>
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
8 *
9 */
10
11#include "qemu/osdep.h"
12#include "qapi/qapi-types-net.h"
13#include "qapi/error.h"
14#include "clients.h"
15#include "vmnet_int.h"
16
17#include <vmnet/vmnet.h>
18
19
20static bool validate_ifname(const char *ifname)
21{
22    xpc_object_t shared_if_list = vmnet_copy_shared_interface_list();
23    bool match = false;
24    if (!xpc_array_get_count(shared_if_list)) {
25        goto done;
26    }
27
28    match = !xpc_array_apply(
29        shared_if_list,
30        ^bool(size_t index, xpc_object_t value) {
31            return strcmp(xpc_string_get_string_ptr(value), ifname) != 0;
32        });
33
34done:
35    xpc_release(shared_if_list);
36    return match;
37}
38
39
40static char* get_valid_ifnames(void)
41{
42    xpc_object_t shared_if_list = vmnet_copy_shared_interface_list();
43    __block char *if_list = NULL;
44    __block char *if_list_prev = NULL;
45
46    if (!xpc_array_get_count(shared_if_list)) {
47        goto done;
48    }
49
50    xpc_array_apply(
51        shared_if_list,
52        ^bool(size_t index, xpc_object_t value) {
53            /* build list of strings like "en0 en1 en2 " */
54            if_list = g_strconcat(xpc_string_get_string_ptr(value),
55                                  " ",
56                                  if_list_prev,
57                                  NULL);
58            g_free(if_list_prev);
59            if_list_prev = if_list;
60            return true;
61        });
62
63done:
64    xpc_release(shared_if_list);
65    return if_list;
66}
67
68
69static bool validate_options(const Netdev *netdev, Error **errp)
70{
71    const NetdevVmnetBridgedOptions *options = &(netdev->u.vmnet_bridged);
72    char* if_list;
73
74    if (!validate_ifname(options->ifname)) {
75        if_list = get_valid_ifnames();
76        if (if_list) {
77            error_setg(errp,
78                       "unsupported ifname '%s', expected one of [ %s]",
79                       options->ifname,
80                       if_list);
81            g_free(if_list);
82        } else {
83            error_setg(errp,
84                       "unsupported ifname '%s', no supported "
85                       "interfaces available",
86                       options->ifname);
87        }
88        return false;
89    }
90
91    return true;
92}
93
94
95static xpc_object_t build_if_desc(const Netdev *netdev)
96{
97    const NetdevVmnetBridgedOptions *options = &(netdev->u.vmnet_bridged);
98    xpc_object_t if_desc = xpc_dictionary_create(NULL, NULL, 0);
99
100    xpc_dictionary_set_uint64(if_desc,
101                              vmnet_operation_mode_key,
102                              VMNET_BRIDGED_MODE
103    );
104
105    xpc_dictionary_set_string(if_desc,
106                              vmnet_shared_interface_name_key,
107                              options->ifname);
108
109    xpc_dictionary_set_bool(if_desc,
110                            vmnet_enable_isolation_key,
111                            options->isolated);
112
113    return if_desc;
114}
115
116
117static NetClientInfo net_vmnet_bridged_info = {
118    .type = NET_CLIENT_DRIVER_VMNET_BRIDGED,
119    .size = sizeof(VmnetState),
120    .receive = vmnet_receive_common,
121    .cleanup = vmnet_cleanup_common,
122};
123
124
125int net_init_vmnet_bridged(const Netdev *netdev, const char *name,
126                           NetClientState *peer, Error **errp)
127{
128    NetClientState *nc = qemu_new_net_client(&net_vmnet_bridged_info,
129                                             peer, "vmnet-bridged", name);
130    xpc_object_t if_desc;
131    int result = -1;
132
133    if (!validate_options(netdev, errp)) {
134        return result;
135    }
136
137    if_desc = build_if_desc(netdev);
138    result = vmnet_if_create(nc, if_desc, errp);
139    xpc_release(if_desc);
140    return result;
141}
142