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P2P: support random interface address

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To enhance privacy, generate a random interface for each group.

There are two configurations are introduced:
* p2p_interface_random_mac_addr
  enable interface random MAC address feature, default disable.

Signed-off-by: Jimmy Chen <jimmycmchen@google.com>
This commit is contained in:
Jimmy Chen 2018-11-29 16:46:43 +08:00 committed by Jouni Malinen
parent 9359cc8483
commit a95906f938
4 changed files with 44 additions and 0 deletions
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1
wpa_supplicant/config.c
View file

@ -4787,6 +4787,7 @@ static const struct global_parse_data global_fields[] = {
{ INT_RANGE(p2p_cli_probe, 0, 1), 0 },
{ INT(p2p_device_random_mac_addr), 0 },
{ FUNC(p2p_device_persistent_mac_addr), 0 },
{ INT(p2p_interface_random_mac_addr), 0 },
#endif /* CONFIG_P2P */
{ FUNC(country), CFG_CHANGED_COUNTRY },
{ INT(bss_max_count), 0 },

10
wpa_supplicant/config.h
View file

@ -1507,6 +1507,16 @@ struct wpa_config {
* random MAC address, and need to restore to last used MAC address.
*/
u8 p2p_device_persistent_mac_addr[ETH_ALEN];
/**
* p2p_interface_random_mac_addr - P2P Interface MAC address policy default
*
* 0 = use permanent MAC address
* 1 = use random MAC address on creating the interface.
*
* By default, permanent MAC address is used.
*/
int p2p_interface_random_mac_addr;
};

3
wpa_supplicant/config_file.c
View file

@ -1535,6 +1535,9 @@ static void wpa_config_write_global(FILE *f, struct wpa_config *config)
if (!is_zero_ether_addr(config->p2p_device_persistent_mac_addr))
fprintf(f, "p2p_device_persistent_mac_addr=" MACSTR "\n",
MAC2STR(config->p2p_device_persistent_mac_addr));
if (config->p2p_interface_random_mac_addr)
fprintf(f, "p2p_interface_random_mac_addr=%d\n",
config->p2p_interface_random_mac_addr);
}
#endif /* CONFIG_NO_CONFIG_WRITE */

30
wpa_supplicant/p2p_supplicant.c
View file

@ -2076,6 +2076,13 @@ static int wpas_p2p_add_group_interface(struct wpa_supplicant *wpa_s,
return -1;
}
if (wpa_s->conf->p2p_interface_random_mac_addr) {
random_mac_addr(wpa_s->pending_interface_addr);
wpa_printf(MSG_DEBUG, "P2P: Generate random MAC address " MACSTR
" for the group",
MAC2STR(wpa_s->pending_interface_addr));
}
if (force_ifname[0]) {
wpa_printf(MSG_DEBUG, "P2P: Driver forced interface name %s",
force_ifname);
@ -2154,6 +2161,29 @@ wpas_p2p_init_group_interface(struct wpa_supplicant *wpa_s, int go)
wpas_p2p_clone_config(group_wpa_s, wpa_s);
if (wpa_s->conf->p2p_interface_random_mac_addr) {
if (wpa_drv_set_mac_addr(group_wpa_s,
wpa_s->pending_interface_addr) < 0) {
wpa_msg(group_wpa_s, MSG_INFO,
"Failed to set random MAC address");
wpa_supplicant_remove_iface(wpa_s->global, group_wpa_s,
0);
return NULL;
}
if (wpa_supplicant_update_mac_addr(group_wpa_s) < 0) {
wpa_msg(group_wpa_s, MSG_INFO,
"Could not update MAC address information");
wpa_supplicant_remove_iface(wpa_s->global, group_wpa_s,
0);
return NULL;
}
wpa_printf(MSG_DEBUG, "P2P: Using random MAC address " MACSTR
" for the group",
MAC2STR(wpa_s->pending_interface_addr));
}
return group_wpa_s;
}