mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 07:22:33 +00:00
471 lines
12 KiB
Diff
471 lines
12 KiB
Diff
Subject: cfg80211/nl80211: introduce key handling
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This introduces key handling to cfg80211/nl80211. Default
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and group keys can be added, changed and removed; sequence
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counters for each key can be retrieved.
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Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
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---
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include/linux/nl80211.h | 34 +++++
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include/net/cfg80211.h | 44 +++++++
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net/wireless/core.c | 3
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net/wireless/nl80211.c | 289 ++++++++++++++++++++++++++++++++++++++++++++++++
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4 files changed, 370 insertions(+)
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--- everything.orig/include/linux/nl80211.h 2007-10-30 15:33:43.587381346 +0100
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+++ everything/include/linux/nl80211.h 2007-11-07 13:19:37.861516599 +0100
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@@ -37,6 +37,16 @@
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* userspace to request deletion of a virtual interface, then requires
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* attribute %NL80211_ATTR_IFINDEX.
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*
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+ * @NL80211_CMD_GET_KEY: Get sequence counter information for a key specified
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+ * by %NL80211_ATTR_KEY_IDX and/or %NL80211_ATTR_MAC.
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+ * @NL80211_CMD_SET_KEY: Set key attributes %NL80211_ATTR_KEY_DEFAULT or
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+ * %NL80211_ATTR_KEY_THRESHOLD.
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+ * @NL80211_CMD_NEW_KEY: add a key with given %NL80211_ATTR_KEY_DATA,
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+ * %NL80211_ATTR_KEY_IDX, %NL80211_ATTR_MAC and %NL80211_ATTR_KEY_CIPHER
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+ * attributes.
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+ * @NL80211_CMD_DEL_KEY: delete a key identified by %NL80211_ATTR_KEY_IDX
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+ * or %NL80211_ATTR_MAC.
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+ *
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* @NL80211_CMD_MAX: highest used command number
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* @__NL80211_CMD_AFTER_LAST: internal use
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*/
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@@ -54,6 +64,11 @@ enum nl80211_commands {
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NL80211_CMD_NEW_INTERFACE,
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NL80211_CMD_DEL_INTERFACE,
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+ NL80211_CMD_GET_KEY,
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+ NL80211_CMD_SET_KEY,
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+ NL80211_CMD_NEW_KEY,
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+ NL80211_CMD_DEL_KEY,
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+
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/* add commands here */
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/* used to define NL80211_CMD_MAX below */
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@@ -75,6 +90,17 @@ enum nl80211_commands {
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* @NL80211_ATTR_IFNAME: network interface name
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* @NL80211_ATTR_IFTYPE: type of virtual interface, see &enum nl80211_iftype
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*
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+ * @NL80211_ATTR_MAC: MAC address (various uses)
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+ *
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+ * @NL80211_ATTR_KEY_DATA: (temporal) key data; for TKIP this consists of
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+ * 16 bytes encryption key followed by 8 bytes each for TX and RX MIC
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+ * keys
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+ * @NL80211_ATTR_KEY_IDX: key ID (u8, 0-3)
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+ * @NL80211_ATTR_KEY_CIPHER: key cipher suite (u32, as defined by IEEE 802.11
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+ * section 7.3.2.25.1, e.g. 0x000FAC04)
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+ * @NL80211_ATTR_KEY_SEQ: transmit key sequence number (IV/PN) for TKIP and
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+ * CCMP keys, each six bytes in little endian
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+ *
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* @NL80211_ATTR_MAX: highest attribute number currently defined
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* @__NL80211_ATTR_AFTER_LAST: internal use
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*/
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@@ -89,6 +115,14 @@ enum nl80211_attrs {
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NL80211_ATTR_IFNAME,
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NL80211_ATTR_IFTYPE,
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+ NL80211_ATTR_MAC,
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+
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+ NL80211_ATTR_KEY_DATA,
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+ NL80211_ATTR_KEY_IDX,
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+ NL80211_ATTR_KEY_CIPHER,
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+ NL80211_ATTR_KEY_SEQ,
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+ NL80211_ATTR_KEY_DEFAULT,
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+
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/* add attributes here, update the policy in nl80211.c */
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__NL80211_ATTR_AFTER_LAST,
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--- everything.orig/net/wireless/nl80211.c 2007-10-30 15:33:43.637380153 +0100
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+++ everything/net/wireless/nl80211.c 2007-11-07 13:19:38.201511066 +0100
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@@ -61,6 +61,14 @@ static struct nla_policy nl80211_policy[
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[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
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[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
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[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
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+
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+ [NL80211_ATTR_MAC] = { .type = NLA_BINARY, .len = ETH_ALEN },
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+
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+ [NL80211_ATTR_KEY_DATA] = { .type = NLA_BINARY,
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+ .len = WLAN_MAX_KEY_LEN },
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+ [NL80211_ATTR_KEY_IDX] = { .type = NLA_U8 },
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+ [NL80211_ATTR_KEY_CIPHER] = { .type = NLA_U32 },
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+ [NL80211_ATTR_KEY_DEFAULT] = { .type = NLA_FLAG },
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};
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/* message building helper */
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@@ -335,6 +343,263 @@ static int nl80211_del_interface(struct
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return err;
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}
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+struct get_key_cookie {
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+ struct sk_buff *msg;
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+ int error;
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+};
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+
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+static void get_key_callback(void *c, struct key_params *params)
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+{
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+ struct get_key_cookie *cookie = c;
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+
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+ if (params->key)
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+ NLA_PUT(cookie->msg, NL80211_ATTR_KEY_DATA,
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+ params->key_len, params->key);
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+
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+ if (params->seq)
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+ NLA_PUT(cookie->msg, NL80211_ATTR_KEY_SEQ,
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+ params->seq_len, params->seq);
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+
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+ if (params->cipher)
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+ NLA_PUT_U32(cookie->msg, NL80211_ATTR_KEY_CIPHER,
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+ params->cipher);
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+
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+ return;
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+ nla_put_failure:
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+ cookie->error = 1;
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+}
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+
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+static int nl80211_get_key(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct cfg80211_registered_device *drv;
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+ int err;
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+ struct net_device *dev;
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+ u8 key_idx = 0;
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+ u8 *mac_addr = NULL;
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+ struct get_key_cookie cookie = {
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+ .error = 0,
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+ };
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+ void *hdr;
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+ struct sk_buff *msg;
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+
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+ if (info->attrs[NL80211_ATTR_KEY_IDX])
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+ key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
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+
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+ if (key_idx > 3)
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+ return -EINVAL;
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+
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+ if (info->attrs[NL80211_ATTR_MAC])
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+ mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
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+
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+ err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
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+ if (err)
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+ return err;
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+
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+ if (!drv->ops->get_key) {
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+ err = -EOPNOTSUPP;
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+ goto out;
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+ }
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+
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+ msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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+ if (!msg) {
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+ err = -ENOMEM;
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+ goto out;
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+ }
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+
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+ hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,
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+ NL80211_CMD_NEW_KEY);
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+
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+ if (IS_ERR(hdr)) {
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+ err = PTR_ERR(hdr);
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+ goto out;
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+ }
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+
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+ cookie.msg = msg;
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+
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+ NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
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+ NLA_PUT_U8(msg, NL80211_ATTR_KEY_IDX, key_idx);
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+ if (mac_addr)
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+ NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
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+
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+ rtnl_lock();
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+ err = drv->ops->get_key(&drv->wiphy, dev, key_idx, mac_addr,
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+ &cookie, get_key_callback);
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+ rtnl_unlock();
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+
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+ if (err)
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+ goto out;
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+
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+ if (cookie.error)
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+ goto nla_put_failure;
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+
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+ genlmsg_end(msg, hdr);
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+ err = genlmsg_unicast(msg, info->snd_pid);
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+ goto out;
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+
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+ nla_put_failure:
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+ err = -ENOBUFS;
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+ nlmsg_free(msg);
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+ out:
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+ cfg80211_put_dev(drv);
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+ dev_put(dev);
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+ return err;
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+}
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+
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+static int nl80211_set_key(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct cfg80211_registered_device *drv;
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+ int err;
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+ struct net_device *dev;
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+ u8 key_idx;
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+
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+ if (!info->attrs[NL80211_ATTR_KEY_IDX])
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+ return -EINVAL;
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+
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+ key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
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+
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+ if (key_idx > 3)
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+ return -EINVAL;
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+
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+ /* currently only support setting default key */
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+ if (!info->attrs[NL80211_ATTR_KEY_DEFAULT])
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+ return -EINVAL;
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+
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+ err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
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+ if (err)
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+ return err;
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+
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+ if (!drv->ops->set_default_key) {
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+ err = -EOPNOTSUPP;
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+ goto out;
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+ }
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+
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+ rtnl_lock();
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+ err = drv->ops->set_default_key(&drv->wiphy, dev, key_idx);
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+ rtnl_unlock();
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+
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+ out:
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+ cfg80211_put_dev(drv);
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+ dev_put(dev);
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+ return err;
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+}
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+
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+static int nl80211_new_key(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct cfg80211_registered_device *drv;
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+ int err;
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+ struct net_device *dev;
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+ struct key_params params;
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+ u8 key_idx = 0;
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+ u8 *mac_addr = NULL;
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+
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+ memset(¶ms, 0, sizeof(params));
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+
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+ if (!info->attrs[NL80211_ATTR_KEY_CIPHER])
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+ return -EINVAL;
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+
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+ if (info->attrs[NL80211_ATTR_KEY_DATA]) {
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+ params.key = nla_data(info->attrs[NL80211_ATTR_KEY_DATA]);
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+ params.key_len = nla_len(info->attrs[NL80211_ATTR_KEY_DATA]);
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+ }
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+
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+ if (info->attrs[NL80211_ATTR_KEY_IDX])
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+ key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
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+
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+ params.cipher = nla_get_u32(info->attrs[NL80211_ATTR_KEY_CIPHER]);
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+
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+ if (info->attrs[NL80211_ATTR_MAC])
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+ mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
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+
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+ if (key_idx > 3)
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+ return -EINVAL;
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+
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+ /*
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+ * Disallow pairwise keys with non-zero index unless it's WEP
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+ * (because current deployments use pairwise WEP keys with
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+ * non-zero indizes but 802.11i clearly specifies to use zero)
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+ */
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+ if (mac_addr && key_idx &&
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+ params.cipher != WLAN_CIPHER_SUITE_WEP40 &&
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+ params.cipher != WLAN_CIPHER_SUITE_WEP104)
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+ return -EINVAL;
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+
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+ /* TODO: add definitions for the lengths to linux/ieee80211.h */
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+ switch (params.cipher) {
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+ case WLAN_CIPHER_SUITE_WEP40:
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+ if (params.key_len != 5)
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+ return -EINVAL;
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+ break;
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+ case WLAN_CIPHER_SUITE_TKIP:
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+ if (params.key_len != 32)
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+ return -EINVAL;
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+ break;
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+ case WLAN_CIPHER_SUITE_CCMP:
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+ if (params.key_len != 16)
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+ return -EINVAL;
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+ break;
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+ case WLAN_CIPHER_SUITE_WEP104:
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+ if (params.key_len != 13)
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+ return -EINVAL;
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+ break;
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+ default:
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+ return -EINVAL;
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+ }
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+
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+ err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
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+ if (err)
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+ return err;
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+
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+ if (!drv->ops->add_key) {
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+ err = -EOPNOTSUPP;
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+ goto out;
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+ }
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+
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+ rtnl_lock();
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+ err = drv->ops->add_key(&drv->wiphy, dev, key_idx, mac_addr, ¶ms);
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+ rtnl_unlock();
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+
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+ out:
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+ cfg80211_put_dev(drv);
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+ dev_put(dev);
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+ return err;
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+}
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+
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+static int nl80211_del_key(struct sk_buff *skb, struct genl_info *info)
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+{
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+ struct cfg80211_registered_device *drv;
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+ int err;
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+ struct net_device *dev;
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+ u8 key_idx = 0;
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+ u8 *mac_addr = NULL;
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+
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+ if (info->attrs[NL80211_ATTR_KEY_IDX])
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+ key_idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);
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+
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+ if (key_idx > 3)
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+ return -EINVAL;
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+
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+ if (info->attrs[NL80211_ATTR_MAC])
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+ mac_addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
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+
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+ err = get_drv_dev_by_info_ifindex(info, &drv, &dev);
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+ if (err)
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+ return err;
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+
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+ if (!drv->ops->del_key) {
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+ err = -EOPNOTSUPP;
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+ goto out;
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+ }
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+
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+ rtnl_lock();
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+ err = drv->ops->del_key(&drv->wiphy, dev, key_idx, mac_addr);
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+ rtnl_unlock();
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+
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+ out:
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+ cfg80211_put_dev(drv);
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+ dev_put(dev);
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+ return err;
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+}
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+
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static struct genl_ops nl80211_ops[] = {
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{
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.cmd = NL80211_CMD_GET_WIPHY,
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@@ -374,6 +639,30 @@ static struct genl_ops nl80211_ops[] = {
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.policy = nl80211_policy,
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.flags = GENL_ADMIN_PERM,
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},
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+ {
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+ .cmd = NL80211_CMD_GET_KEY,
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+ .doit = nl80211_get_key,
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+ .policy = nl80211_policy,
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+ .flags = GENL_ADMIN_PERM,
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+ },
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+ {
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+ .cmd = NL80211_CMD_SET_KEY,
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+ .doit = nl80211_set_key,
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+ .policy = nl80211_policy,
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+ .flags = GENL_ADMIN_PERM,
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+ },
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+ {
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+ .cmd = NL80211_CMD_NEW_KEY,
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+ .doit = nl80211_new_key,
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+ .policy = nl80211_policy,
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+ .flags = GENL_ADMIN_PERM,
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+ },
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+ {
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+ .cmd = NL80211_CMD_DEL_KEY,
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+ .doit = nl80211_del_key,
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+ .policy = nl80211_policy,
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+ .flags = GENL_ADMIN_PERM,
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+ },
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};
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/* multicast groups */
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--- everything.orig/net/wireless/core.c 2007-10-30 15:33:43.677380478 +0100
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+++ everything/net/wireless/core.c 2007-11-07 13:19:38.221513833 +0100
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@@ -184,6 +184,9 @@ struct wiphy *wiphy_new(struct cfg80211_
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struct cfg80211_registered_device *drv;
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int alloc_size;
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+ WARN_ON(!ops->add_key && ops->del_key);
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+ WARN_ON(ops->add_key && !ops->del_key);
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+
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alloc_size = sizeof(*drv) + sizeof_priv;
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drv = kzalloc(alloc_size, GFP_KERNEL);
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--- everything.orig/include/net/cfg80211.h 2007-10-30 15:33:43.617381780 +0100
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+++ everything/include/net/cfg80211.h 2007-11-07 13:19:38.231512748 +0100
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@@ -49,6 +49,26 @@ extern int ieee80211_radiotap_iterator_n
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struct ieee80211_radiotap_iterator *iterator);
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+ /**
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+ * struct key_params - key information
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+ *
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+ * Information about a key
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+ *
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+ * @key: key material
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+ * @key_len: length of key material
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+ * @cipher: cipher suite selector
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+ * @seq: sequence counter (IV/PN) for TKIP and CCMP keys, only used
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+ * with the get_key() callback, must be in little endian,
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+ * length given by @seq_len.
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+ */
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+struct key_params {
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+ u8 *key;
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+ u8 *seq;
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+ int key_len;
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+ int seq_len;
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+ u32 cipher;
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+};
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+
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/* from net/wireless.h */
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struct wiphy;
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@@ -71,6 +91,18 @@ struct wiphy;
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*
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* @change_virtual_intf: change type of virtual interface
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*
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+ * @add_key: add a key with the given parameters. @mac_addr will be %NULL
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+ * when adding a group key.
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+ *
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+ * @get_key: get information about the key with the given parameters.
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+ * @mac_addr will be %NULL when requesting information for a group
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+ * key. All pointers given to the @callback function need not be valid
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+ * after it returns.
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+ *
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+ * @del_key: remove a key given the @mac_addr (%NULL for a group key)
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+ * and @key_index
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+ *
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+ * @set_default_key: set the default key on an interface
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*/
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struct cfg80211_ops {
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int (*add_virtual_intf)(struct wiphy *wiphy, char *name,
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@@ -78,6 +110,18 @@ struct cfg80211_ops {
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int (*del_virtual_intf)(struct wiphy *wiphy, int ifindex);
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int (*change_virtual_intf)(struct wiphy *wiphy, int ifindex,
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enum nl80211_iftype type);
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+
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+ int (*add_key)(struct wiphy *wiphy, struct net_device *netdev,
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+ u8 key_index, u8 *mac_addr,
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+ struct key_params *params);
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+ int (*get_key)(struct wiphy *wiphy, struct net_device *netdev,
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+ u8 key_index, u8 *mac_addr, void *cookie,
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+ void (*callback)(void *cookie, struct key_params*));
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+ int (*del_key)(struct wiphy *wiphy, struct net_device *netdev,
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+ u8 key_index, u8 *mac_addr);
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+ int (*set_default_key)(struct wiphy *wiphy,
|
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+ struct net_device *netdev,
|
|
+ u8 key_index);
|
|
};
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|
|
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#endif /* __NET_CFG80211_H */
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