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authorJohannes Berg <johannes.berg@intel.com>2015-08-15 22:39:49 +0300
committerJohannes Berg <johannes.berg@intel.com>2015-09-22 15:21:22 +0200
commit7bdbe400d1b2aac116513f90b75969ad2365fba6 (patch)
treeeccc79938135d9f5eb7fdad2ca3f20c3c62679ec /net/wireless
parentdd55ab59b6234c73522dc533757e89e6a77c2c38 (diff)
downloadlinux-stericsson-7bdbe400d1b2aac116513f90b75969ad2365fba6.tar.gz
nl80211: support vendor dumpit commands
In order to transfer many items in vendor commands, support the dumpit netlink method for them. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/nl80211.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 5d8748b4c8a2..a4e6c951950f 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3,6 +3,7 @@
*
* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
+ * Copyright 2015 Intel Deutschland GmbH
*/
#include <linux/if.h>
@@ -9938,6 +9939,9 @@ static int nl80211_vendor_cmd(struct sk_buff *skb, struct genl_info *info)
if (!wdev->netdev && !wdev->p2p_started)
return -ENETDOWN;
}
+
+ if (!vcmd->doit)
+ return -EOPNOTSUPP;
} else {
wdev = NULL;
}
@@ -9957,6 +9961,193 @@ static int nl80211_vendor_cmd(struct sk_buff *skb, struct genl_info *info)
return -EOPNOTSUPP;
}
+static int nl80211_prepare_vendor_dump(struct sk_buff *skb,
+ struct netlink_callback *cb,
+ struct cfg80211_registered_device **rdev,
+ struct wireless_dev **wdev)
+{
+ u32 vid, subcmd;
+ unsigned int i;
+ int vcmd_idx = -1;
+ int err;
+ void *data = NULL;
+ unsigned int data_len = 0;
+
+ rtnl_lock();
+
+ if (cb->args[0]) {
+ /* subtract the 1 again here */
+ struct wiphy *wiphy = wiphy_idx_to_wiphy(cb->args[0] - 1);
+ struct wireless_dev *tmp;
+
+ if (!wiphy) {
+ err = -ENODEV;
+ goto out_unlock;
+ }
+ *rdev = wiphy_to_rdev(wiphy);
+ *wdev = NULL;
+
+ if (cb->args[1]) {
+ list_for_each_entry(tmp, &(*rdev)->wdev_list, list) {
+ if (tmp->identifier == cb->args[1] - 1) {
+ *wdev = tmp;
+ break;
+ }
+ }
+ }
+
+ /* keep rtnl locked in successful case */
+ return 0;
+ }
+
+ err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
+ nl80211_fam.attrbuf, nl80211_fam.maxattr,
+ nl80211_policy);
+ if (err)
+ goto out_unlock;
+
+ if (!nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_ID] ||
+ !nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_SUBCMD]) {
+ err = -EINVAL;
+ goto out_unlock;
+ }
+
+ *wdev = __cfg80211_wdev_from_attrs(sock_net(skb->sk),
+ nl80211_fam.attrbuf);
+ if (IS_ERR(*wdev))
+ *wdev = NULL;
+
+ *rdev = __cfg80211_rdev_from_attrs(sock_net(skb->sk),
+ nl80211_fam.attrbuf);
+ if (IS_ERR(*rdev)) {
+ err = PTR_ERR(*rdev);
+ goto out_unlock;
+ }
+
+ vid = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_ID]);
+ subcmd = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_SUBCMD]);
+
+ for (i = 0; i < (*rdev)->wiphy.n_vendor_commands; i++) {
+ const struct wiphy_vendor_command *vcmd;
+
+ vcmd = &(*rdev)->wiphy.vendor_commands[i];
+
+ if (vcmd->info.vendor_id != vid || vcmd->info.subcmd != subcmd)
+ continue;
+
+ if (!vcmd->dumpit) {
+ err = -EOPNOTSUPP;
+ goto out_unlock;
+ }
+
+ vcmd_idx = i;
+ break;
+ }
+
+ if (vcmd_idx < 0) {
+ err = -EOPNOTSUPP;
+ goto out_unlock;
+ }
+
+ if (nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_DATA]) {
+ data = nla_data(nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_DATA]);
+ data_len = nla_len(nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_DATA]);
+ }
+
+ /* 0 is the first index - add 1 to parse only once */
+ cb->args[0] = (*rdev)->wiphy_idx + 1;
+ /* add 1 to know if it was NULL */
+ cb->args[1] = *wdev ? (*wdev)->identifier + 1 : 0;
+ cb->args[2] = vcmd_idx;
+ cb->args[3] = (unsigned long)data;
+ cb->args[4] = data_len;
+
+ /* keep rtnl locked in successful case */
+ return 0;
+ out_unlock:
+ rtnl_unlock();
+ return err;
+}
+
+static int nl80211_vendor_cmd_dump(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct cfg80211_registered_device *rdev;
+ struct wireless_dev *wdev;
+ unsigned int vcmd_idx;
+ const struct wiphy_vendor_command *vcmd;
+ void *data;
+ int data_len;
+ int err;
+ struct nlattr *vendor_data;
+
+ err = nl80211_prepare_vendor_dump(skb, cb, &rdev, &wdev);
+ if (err)
+ return err;
+
+ vcmd_idx = cb->args[2];
+ data = (void *)cb->args[3];
+ data_len = cb->args[4];
+ vcmd = &rdev->wiphy.vendor_commands[vcmd_idx];
+
+ if (vcmd->flags & (WIPHY_VENDOR_CMD_NEED_WDEV |
+ WIPHY_VENDOR_CMD_NEED_NETDEV)) {
+ if (!wdev)
+ return -EINVAL;
+ if (vcmd->flags & WIPHY_VENDOR_CMD_NEED_NETDEV &&
+ !wdev->netdev)
+ return -EINVAL;
+
+ if (vcmd->flags & WIPHY_VENDOR_CMD_NEED_RUNNING) {
+ if (wdev->netdev &&
+ !netif_running(wdev->netdev))
+ return -ENETDOWN;
+ if (!wdev->netdev && !wdev->p2p_started)
+ return -ENETDOWN;
+ }
+ }
+
+ while (1) {
+ void *hdr = nl80211hdr_put(skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ NL80211_CMD_VENDOR);
+ if (!hdr)
+ break;
+
+ if (nla_put_u32(skb, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
+ (wdev && nla_put_u64(skb, NL80211_ATTR_WDEV,
+ wdev_id(wdev)))) {
+ genlmsg_cancel(skb, hdr);
+ break;
+ }
+
+ vendor_data = nla_nest_start(skb, NL80211_ATTR_VENDOR_DATA);
+ if (!vendor_data) {
+ genlmsg_cancel(skb, hdr);
+ break;
+ }
+
+ err = vcmd->dumpit(&rdev->wiphy, wdev, skb, data, data_len,
+ (unsigned long *)&cb->args[5]);
+ nla_nest_end(skb, vendor_data);
+
+ if (err == -ENOBUFS || err == -ENOENT) {
+ genlmsg_cancel(skb, hdr);
+ break;
+ } else if (err) {
+ genlmsg_cancel(skb, hdr);
+ goto out;
+ }
+
+ genlmsg_end(skb, hdr);
+ }
+
+ err = skb->len;
+ out:
+ rtnl_unlock();
+ return err;
+}
+
struct sk_buff *__cfg80211_alloc_reply_skb(struct wiphy *wiphy,
enum nl80211_commands cmd,
enum nl80211_attrs attr,
@@ -10994,6 +11185,7 @@ static const struct genl_ops nl80211_ops[] = {
{
.cmd = NL80211_CMD_VENDOR,
.doit = nl80211_vendor_cmd,
+ .dumpit = nl80211_vendor_cmd_dump,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
.internal_flags = NL80211_FLAG_NEED_WIPHY |