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ANDROID: net: wireless: Add module_param(mac_prefix) to mac80211_hwsim

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By default mac80211_hwsim creates N radios with
MAC addresses like '02:00:00:nn:nn:00' where nnnn
is incremented.

We (Android Studio Emulator) need a way to have unique
MAC addresses, mac_prefix provides a way to specify
two octets in MAC address, i.e. '02:xx:xx:nn:nn:00'
to make it unique between emulator instances.

This is temporary solution and should be replaced
by HWSIM_CMD_NEW_RADIO with HWSIM_ATTR_PERM_ADDR,
the work is tracked in b/149778407.

Bug: 150388981
Bug: 149778407
Bug: 147493341
Test: check if wifi works on emulator
Signed-off-by: Roman Kiryanov <rkir@google.com>
Change-Id: Ibab0de6cb720d55c7be0b96e40ec70e221e04d7f
This commit is contained in:
Roman Kiryanov
2020-02-27 11:15:07 -08:00
parent 237715df0a
commit 21afbdd808
1 changed files with 6 additions and 0 deletions
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6
drivers/net/wireless/mac80211_hwsim.c
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@@ -62,6 +62,10 @@ static bool support_p2p_device = true;
module_param(support_p2p_device, bool, 0444);
MODULE_PARM_DESC(support_p2p_device, "Support P2P-Device interface type");
static ushort mac_prefix;
module_param(mac_prefix, ushort, 0444);
MODULE_PARM_DESC(mac_prefix, "Second and third most significant octets in MAC");
/**
* enum hwsim_regtest - the type of regulatory tests we offer
*
@@ -2811,6 +2815,8 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
if (!param->perm_addr) {
eth_zero_addr(addr);
addr[0] = 0x02;
addr[1] = (mac_prefix >> 8) & 0xFF;
addr[2] = mac_prefix & 0xFF;
addr[3] = idx >> 8;
addr[4] = idx;
memcpy(data->addresses[0].addr, addr, ETH_ALEN);