nl80211: support vendor-specific events
In addition to vendor-specific commands, also support vendor-specific
events. These must be registered with cfg80211 before they can be used.
They're also advertised in nl80211 in the wiphy information so that
userspace knows can be expected. The events themselves are sent on a
new multicast group called "vendor".
Change-Id: I184aaa9f9e8461aee572f7d0a35916cd668c2218
CRs-fixed: 576020
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-commit: 567ffc3509b2d3f965a49a18631d3da7f9a96d4f
Git-repo: https://git.kernel.org/cgit/linux/kernel/git/linville/wireless-next.git
Signed-off-by: Leo Chang <leochang@codeaurora.org>
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 97de44d..d797797 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -1443,6 +1443,8 @@
* @NL80211_ATTR_VENDOR_SUBCMD: vendor sub-command
* @NL80211_ATTR_VENDOR_DATA: data for the vendor command, if any; this
* attribute is also used for vendor command feature advertisement
+ * @NL80211_ATTR_VENDOR_EVENTS: used for event list advertising in the wiphy
+ * info, containing a nested array of possible events
*
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@@ -1769,6 +1771,8 @@
NL80211_ATTR_VENDOR_SUBCMD,
NL80211_ATTR_VENDOR_DATA,
+ NL80211_ATTR_VENDOR_EVENTS,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 55c7649..9f0d486 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2175,7 +2175,8 @@
*
* @vendor_commands: array of vendor commands supported by the hardware
* @n_vendor_commands: number of vendor commands
- *
+ * @vendor_events: array of vendor events supported by the hardware
+ * @n_vendor_events: number of vendor events
*/
struct wiphy {
/* assign these fields before you register the wiphy */
@@ -2281,7 +2282,8 @@
#endif
const struct wiphy_vendor_command *vendor_commands;
- int n_vendor_commands;
+ const struct nl80211_vendor_cmd_info *vendor_events;
+ int n_vendor_commands, n_vendor_events;
char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
};
@@ -3188,6 +3190,14 @@
enum nl80211_attrs attr,
int approxlen);
+struct sk_buff *__cfg80211_alloc_event_skb(struct wiphy *wiphy,
+ enum nl80211_commands cmd,
+ enum nl80211_attrs attr,
+ int vendor_event_idx,
+ int approxlen, gfp_t gfp);
+
+void __cfg80211_send_event_skb(struct sk_buff *skb, gfp_t gfp);
+
/**
* cfg80211_vendor_cmd_alloc_reply_skb - allocate vendor command reply
* @wiphy: the wiphy
@@ -3232,6 +3242,44 @@
*/
int cfg80211_vendor_cmd_reply(struct sk_buff *skb);
+/**
+ * cfg80211_vendor_event_alloc - allocate vendor-specific event skb
+ * @wiphy: the wiphy
+ * @event_idx: index of the vendor event in the wiphy's vendor_events
+ * @approxlen: an upper bound of the length of the data that will
+ * be put into the skb
+ * @gfp: allocation flags
+ *
+ * This function allocates and pre-fills an skb for an event on the
+ * vendor-specific multicast group.
+ *
+ * When done filling the skb, call cfg80211_vendor_event() with the
+ * skb to send the event.
+ *
+ * Return: An allocated and pre-filled skb. %NULL if any errors happen.
+ */
+static inline struct sk_buff *
+cfg80211_vendor_event_alloc(struct wiphy *wiphy, int approxlen,
+ int event_idx, gfp_t gfp)
+{
+ return __cfg80211_alloc_event_skb(wiphy, NL80211_CMD_VENDOR,
+ NL80211_ATTR_VENDOR_DATA,
+ event_idx, approxlen, gfp);
+}
+
+/**
+ * cfg80211_vendor_event - send the event
+ * @skb: The skb, must have been allocated with cfg80211_vendor_event_alloc()
+ * @gfp: allocation flags
+ *
+ * This function sends the given @skb, which must have been allocated
+ * by cfg80211_vendor_event_alloc(), as an event. It always consumes it.
+ */
+static inline void cfg80211_vendor_event(struct sk_buff *skb, gfp_t gfp)
+{
+ __cfg80211_send_event_skb(skb, gfp);
+}
+
#ifdef CONFIG_NL80211_TESTMODE
/**
* DOC: Test mode
@@ -3307,8 +3355,13 @@
* When done filling the skb, call cfg80211_testmode_event() with the
* skb to send the event.
*/
-struct sk_buff *cfg80211_testmode_alloc_event_skb(struct wiphy *wiphy,
- int approxlen, gfp_t gfp);
+static inline struct sk_buff *
+cfg80211_testmode_alloc_event_skb(struct wiphy *wiphy, int approxlen, gfp_t gfp)
+{
+ return __cfg80211_alloc_event_skb(wiphy, NL80211_CMD_TESTMODE,
+ NL80211_ATTR_TESTDATA, -1,
+ approxlen, gfp);
+}
/**
* cfg80211_testmode_event - send the event
@@ -3320,7 +3373,10 @@
* by cfg80211_testmode_alloc_event_skb(), as an event. It always
* consumes it.
*/
-void cfg80211_testmode_event(struct sk_buff *skb, gfp_t gfp);
+static inline void cfg80211_testmode_event(struct sk_buff *skb, gfp_t gfp)
+{
+ __cfg80211_send_event_skb(skb, gfp);
+}
#define CFG80211_TESTMODE_CMD(cmd) .testmode_cmd = (cmd),
#define CFG80211_TESTMODE_DUMP(cmd) .testmode_dump = (cmd),
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 2d896d6..e90ef68 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1104,6 +1104,23 @@
nla_nest_end(msg, nested);
}
+ if (dev->wiphy.n_vendor_events) {
+ const struct nl80211_vendor_cmd_info *info;
+ struct nlattr *nested;
+
+ nested = nla_nest_start(msg,
+ NL80211_ATTR_VENDOR_EVENTS);
+ if (!nested)
+ goto nla_put_failure;
+
+ for (i = 0; i < dev->wiphy.n_vendor_events; i++) {
+ info = &dev->wiphy.vendor_events[i];
+ if (nla_put(msg, i + 1, sizeof(*info), info))
+ goto nla_put_failure;
+ }
+ nla_nest_end(msg, nested);
+ }
+
return genlmsg_end(msg, hdr);
nla_put_failure:
@@ -5243,7 +5260,9 @@
__cfg80211_alloc_vendor_skb(struct cfg80211_registered_device *rdev,
int approxlen, u32 portid, u32 seq,
enum nl80211_commands cmd,
- enum nl80211_attrs attr, gfp_t gfp)
+ enum nl80211_attrs attr,
+ const struct nl80211_vendor_cmd_info *info,
+ gfp_t gfp)
{
struct sk_buff *skb;
void *hdr;
@@ -5261,6 +5280,16 @@
if (nla_put_u32(skb, NL80211_ATTR_WIPHY, rdev->wiphy_idx))
goto nla_put_failure;
+
+ if (info) {
+ if (nla_put_u32(skb, NL80211_ATTR_VENDOR_ID,
+ info->vendor_id))
+ goto nla_put_failure;
+ if (nla_put_u32(skb, NL80211_ATTR_VENDOR_SUBCMD,
+ info->subcmd))
+ goto nla_put_failure;
+ }
+
data = nla_nest_start(skb, attr);
((void **)skb->cb)[0] = rdev;
@@ -5274,6 +5303,10 @@
return NULL;
}
+static struct genl_multicast_group nl80211_vendor_mcgrp = {
+ .name = "vendor",
+};
+
#ifdef CONFIG_NL80211_TESTMODE
static struct genl_multicast_group nl80211_testmode_mcgrp = {
.name = "testmode",
@@ -5398,27 +5431,53 @@
return err;
}
-struct sk_buff *cfg80211_testmode_alloc_event_skb(struct wiphy *wiphy,
- int approxlen, gfp_t gfp)
+struct sk_buff *__cfg80211_alloc_event_skb(struct wiphy *wiphy,
+ enum nl80211_commands cmd,
+ enum nl80211_attrs attr,
+ int vendor_event_idx,
+ int approxlen, gfp_t gfp)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
+ const struct nl80211_vendor_cmd_info *info;
+ switch (cmd) {
+ case NL80211_CMD_TESTMODE:
+ if (WARN_ON(vendor_event_idx != -1))
+ return NULL;
+ info = NULL;
+ break;
+ case NL80211_CMD_VENDOR:
+ if (WARN_ON(vendor_event_idx < 0 ||
+ vendor_event_idx >= wiphy->n_vendor_events))
+ return NULL;
+ info = &wiphy->vendor_events[vendor_event_idx];
+ break;
+ default:
+ WARN_ON(1);
+ return NULL;
+ }
return __cfg80211_alloc_vendor_skb(rdev, approxlen, 0, 0,
- NL80211_CMD_TESTMODE,
- NL80211_ATTR_TESTDATA, gfp);
+ cmd, attr, info, gfp);
}
-EXPORT_SYMBOL(cfg80211_testmode_alloc_event_skb);
+EXPORT_SYMBOL(__cfg80211_alloc_event_skb);
-void cfg80211_testmode_event(struct sk_buff *skb, gfp_t gfp)
+void __cfg80211_send_event_skb(struct sk_buff *skb, gfp_t gfp)
{
+ struct cfg80211_registered_device *rdev = ((void **)skb->cb)[0];
void *hdr = ((void **)skb->cb)[1];
struct nlattr *data = ((void **)skb->cb)[2];
nla_nest_end(skb, data);
genlmsg_end(skb, hdr);
- genlmsg_multicast(skb, 0, nl80211_testmode_mcgrp.id, gfp);
+
+ if (data->nla_type == NL80211_ATTR_VENDOR_DATA)
+ genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), skb, 0,
+ nl80211_vendor_mcgrp.id, gfp);
+ else
+ genlmsg_multicast_netns(wiphy_net(&rdev->wiphy), skb, 0,
+ nl80211_testmode_mcgrp.id, gfp);
}
-EXPORT_SYMBOL(cfg80211_testmode_event);
+EXPORT_SYMBOL(__cfg80211_send_event_skb);
#endif
static int nl80211_connect(struct sk_buff *skb, struct genl_info *info)
@@ -6714,7 +6773,7 @@
return __cfg80211_alloc_vendor_skb(rdev, approxlen,
0,
0,
- cmd, attr, GFP_KERNEL);
+ cmd, attr, NULL, GFP_KERNEL);
}
EXPORT_SYMBOL(__cfg80211_alloc_reply_skb);
@@ -8669,6 +8728,9 @@
if (err)
goto err_out;
#endif
+ err = genl_register_mc_group(&nl80211_fam, &nl80211_vendor_mcgrp);
+ if (err)
+ goto err_out;
err = netlink_register_notifier(&nl80211_netlink_notifier);
if (err)