nl80211: PMKSA caching support

This is an interface to set, delete and flush PMKIDs through nl80211.
Main users would be fullmac devices which firmwares are capable of
generating the RSN IEs for the re-association requests, e.g. iwmc3200wifi.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/nl80211.c

@@ -139,6 +139,8 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
 	[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
 	[NL80211_ATTR_PID] = { .type = NLA_U32 },
 	[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
+	[NL80211_ATTR_PMKID] = { .type = NLA_BINARY,
+				 .len = WLAN_PMKID_LEN },
 };
 
 /* policy for the attributes */
@@ -450,6 +452,9 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 		sizeof(u32) * dev->wiphy.n_cipher_suites,
 		dev->wiphy.cipher_suites);
 
+	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_PMKIDS,
+		   dev->wiphy.max_num_pmkids);
+
 	nl_modes = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_IFTYPES);
 	if (!nl_modes)
 		goto nla_put_failure;
@@ -561,6 +566,9 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
 	CMD(deauth, DEAUTHENTICATE);
 	CMD(disassoc, DISASSOCIATE);
 	CMD(join_ibss, JOIN_IBSS);
+	CMD(set_pmksa, SET_PMKSA);
+	CMD(del_pmksa, DEL_PMKSA);
+	CMD(flush_pmksa, FLUSH_PMKSA);
 	if (dev->wiphy.flags & WIPHY_FLAG_NETNS_OK) {
 		i++;
 		NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
@@ -4221,6 +4229,99 @@ static int nl80211_wiphy_netns(struct sk_buff *skb, struct genl_info *info)
 	return err;
 }
 
+static int nl80211_setdel_pmksa(struct sk_buff *skb, struct genl_info *info)
+{
+	struct cfg80211_registered_device *rdev;
+	int (*rdev_ops)(struct wiphy *wiphy, struct net_device *dev,
+			struct cfg80211_pmksa *pmksa) = NULL;
+	int err;
+	struct net_device *dev;
+	struct cfg80211_pmksa pmksa;
+
+	memset(&pmksa, 0, sizeof(struct cfg80211_pmksa));
+
+	if (!info->attrs[NL80211_ATTR_MAC])
+		return -EINVAL;
+
+	if (!info->attrs[NL80211_ATTR_PMKID])
+		return -EINVAL;
+
+	rtnl_lock();
+
+	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
+	if (err)
+		goto out_rtnl;
+
+	pmksa.pmkid = nla_data(info->attrs[NL80211_ATTR_PMKID]);
+	pmksa.bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
+
+	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	switch (info->genlhdr->cmd) {
+	case NL80211_CMD_SET_PMKSA:
+		rdev_ops = rdev->ops->set_pmksa;
+		break;
+	case NL80211_CMD_DEL_PMKSA:
+		rdev_ops = rdev->ops->del_pmksa;
+		break;
+	default:
+		WARN_ON(1);
+		break;
+	}
+
+	if (!rdev_ops) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	err = rdev_ops(&rdev->wiphy, dev, &pmksa);
+
+ out:
+	cfg80211_unlock_rdev(rdev);
+	dev_put(dev);
+ out_rtnl:
+	rtnl_unlock();
+
+	return err;
+}
+
+static int nl80211_flush_pmksa(struct sk_buff *skb, struct genl_info *info)
+{
+	struct cfg80211_registered_device *rdev;
+	int err;
+	struct net_device *dev;
+
+	rtnl_lock();
+
+	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
+	if (err)
+		goto out_rtnl;
+
+	if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_STATION) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (!rdev->ops->flush_pmksa) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	err = rdev->ops->flush_pmksa(&rdev->wiphy, dev);
+
+ out:
+	cfg80211_unlock_rdev(rdev);
+	dev_put(dev);
+ out_rtnl:
+	rtnl_unlock();
+
+	return err;
+
+}
+
 static struct genl_ops nl80211_ops[] = {
 	{
 		.cmd = NL80211_CMD_GET_WIPHY,
@@ -4465,6 +4566,25 @@ static struct genl_ops nl80211_ops[] = {
 		.policy = nl80211_policy,
 		.dumpit = nl80211_dump_survey,
 	},
+	{
+		.cmd = NL80211_CMD_SET_PMKSA,
+		.doit = nl80211_setdel_pmksa,
+		.policy = nl80211_policy,
+		.flags = GENL_ADMIN_PERM,
+	},
+	{
+		.cmd = NL80211_CMD_DEL_PMKSA,
+		.doit = nl80211_setdel_pmksa,
+		.policy = nl80211_policy,
+		.flags = GENL_ADMIN_PERM,
+	},
+	{
+		.cmd = NL80211_CMD_FLUSH_PMKSA,
+		.doit = nl80211_flush_pmksa,
+		.policy = nl80211_policy,
+		.flags = GENL_ADMIN_PERM,
+	},
+
 };
 static struct genl_multicast_group nl80211_mlme_mcgrp = {
 	.name = "mlme",