[PATCH 04/17] p2p: limit ciphers to CCMP/TKIP

[James Prestwood <prestwoj@gmail.com>]

The limitation of cipher selection in ap.c was done so to allow p2p to
work. Now with the ability to specify ciphers in the AP config put the
burden on p2p to limit ciphers as it needs.
---
 src/p2p.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/p2p.c b/src/p2p.c
index cfd8560a..ad2ac39f 100644
--- a/src/p2p.c
+++ b/src/p2p.c
@@ -1234,6 +1234,8 @@ static void p2p_group_start(struct p2p_device *dev)
 		((uint64_t) pdt->oui[2] << 24) |
 		((uint64_t) pdt->oui_type << 16) |
 		pdt->subcategory;
+	char *ciphers[] = { "TKIP", "CCMP", NULL };
+	uint16_t cipher;
 
 	l_settings_set_string(config, "General", "SSID", dev->go_group_id.ssid);
 	l_settings_set_uint(config, "General", "Channel", dev->listen_channel);
@@ -1273,6 +1275,19 @@ static void p2p_group_start(struct p2p_device *dev)
 	/* Enable netconfig, set maximum usable DHCP lease time */
 	l_settings_set_uint(config, "IPv4", "LeaseTime", 0x7fffffff);
 
+	l_settings_set_string_list(config, "Security", "PairwiseCiphers",
+					ciphers, ',');
+
+	/* TODO: P2P only plays nice with CCMP or TKIP ciphers currently */
+	cipher = wiphy_select_cipher(dev->wiphy, IE_RSN_CIPHER_SUITE_TKIP |
+						IE_RSN_CIPHER_SUITE_CCMP);
+	if (cipher == IE_RSN_CIPHER_SUITE_CCMP)
+		l_settings_set_string(config, "Security", "GroupCipher",
+					"CCMP");
+	else
+		l_settings_set_string(config, "Security", "GroupCipher",
+					"TKIP");
+
 	dev->capability.group_caps |= P2P_GROUP_CAP_GO;
 	dev->capability.group_caps |= P2P_GROUP_CAP_GROUP_FORMATION;
 	dev->capability.group_caps |= P2P_GROUP_CAP_IP_ALLOCATION;
-- 
2.34.3