This patch allows GET_INTERFACE dumps to be filtered based on
NL80211_ATTR_WIPHY or NL80211_ATTR_WDEV. The documentation for
GET_INTERFACE mentions that this is possible:
"Request an interface's configuration; either a dump request on
a %NL80211_ATTR_WIPHY or ..."
However, this behavior has not been implemented until now.
---
net/wireless/nl80211.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 244d552..24cb4d9 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2515,15 +2515,47 @@ static int nl80211_send_iface(struct sk_buff *msg, u32
portid, u32 seq, int flag
return -EMSGSIZE;
}
+static int nl80211_dump_interface_parse(struct sk_buff *skb,
+ struct netlink_callback *cb,
+ int *filter_wiphy)
+{
+ struct nlattr **tb = nl80211_fam.attrbuf;
+ int ret = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
+ tb, nl80211_fam.maxattr, nl80211_policy);
+ /* ignore parse errors for backward compatibility */
+ if (ret)
+ return 0;
+
+ if (tb[NL80211_ATTR_WIPHY])
+ *filter_wiphy = nla_get_u32(tb[NL80211_ATTR_WIPHY]);
+ if (tb[NL80211_ATTR_WDEV])
+ *filter_wiphy = nla_get_u64(tb[NL80211_ATTR_WDEV]) >> 32;
+
+ return 0;
+}
+
static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback
*cb)
{
int wp_idx = 0;
int if_idx = 0;
int wp_start = cb->args[0];
int if_start = cb->args[1];
+ int filter_wiphy = cb->args[2];
struct cfg80211_registered_device *rdev;
struct wireless_dev *wdev;
+ if (!wp_start && !if_start && !filter_wiphy) {
+ int ret;
+
+ filter_wiphy = -1;
+
+ ret = nl80211_dump_interface_parse(skb, cb, &filter_wiphy);
+ if (ret)
+ return ret;
+
+ cb->args[2] = filter_wiphy;
+ }
+
rtnl_lock();
list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
if (!net_eq(wiphy_net(&rdev->wiphy), sock_net(skb->sk)))
@@ -2532,6 +2564,10 @@ static int nl80211_dump_interface(struct sk_buff *skb,
struct netlink_callback *
wp_idx++;
continue;
}
+
+ if (filter_wiphy != -1 && filter_wiphy != rdev->wiphy_idx)
+ continue;
+
if_idx = 0;
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
--
2.7.3
--
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