2 files changed, 93 insertions, 0 deletions

diff --git a/include/uapi/linux/nfc.h b/include/uapi/linux/nfc.h
index 539d60494c04..029921b067fd 100644
--- a/include/uapi/linux/nfc.h
+++ b/include/uapi/linux/nfc.h
@@ -84,6 +84,7 @@
  * @NFC_EVENT_SE_TRANSACTION: This event is sent when an application running on
  *      a specific SE notifies us about the end of a transaction. The parameter
  *      for this event is the application ID (AID).
+ * @NFC_CMD_GET_SE: Dump all discovered secure elements from an NFC controller.
  */
 enum nfc_commands {
         NFC_CMD_UNSPEC,
@@ -112,6 +113,7 @@ enum nfc_commands {
         NFC_EVENT_SE_REMOVED,
         NFC_EVENT_SE_CONNECTIVITY,
         NFC_EVENT_SE_TRANSACTION,
+        NFC_CMD_GET_SE,
 /* private: internal use only */
         __NFC_CMD_AFTER_LAST
 };
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index f16fd59d4160..3b08ef90e045 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1191,6 +1191,91 @@ static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
         return rc;
 }
 
+static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
+                                u32 portid, u32 seq,
+                                struct netlink_callback *cb,
+                                int flags)
+{
+        void *hdr;
+        struct nfc_se *se, *n;
+
+        list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
+                hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
+                                  NFC_CMD_GET_SE);
+                if (!hdr)
+                        goto nla_put_failure;
+
+                if (cb)
+                        genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
+
+                if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
+                    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
+                    nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
+                        goto nla_put_failure;
+
+                if (genlmsg_end(msg, hdr) < 0)
+                        goto nla_put_failure;
+        }
+
+        return 0;
+
+nla_put_failure:
+        genlmsg_cancel(msg, hdr);
+        return -EMSGSIZE;
+}
+
+static int nfc_genl_dump_ses(struct sk_buff *skb,
+                                 struct netlink_callback *cb)
+{
+        struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
+        struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
+        bool first_call = false;
+
+        if (!iter) {
+                first_call = true;
+                iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
+                if (!iter)
+                        return -ENOMEM;
+                cb->args[0] = (long) iter;
+        }
+
+        mutex_lock(&nfc_devlist_mutex);
+
+        cb->seq = nfc_devlist_generation;
+
+        if (first_call) {
+                nfc_device_iter_init(iter);
+                dev = nfc_device_iter_next(iter);
+        }
+
+        while (dev) {
+                int rc;
+
+                rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
+                                          cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
+                if (rc < 0)
+                        break;
+
+                dev = nfc_device_iter_next(iter);
+        }
+
+        mutex_unlock(&nfc_devlist_mutex);
+
+        cb->args[1] = (long) dev;
+
+        return skb->len;
+}
+
+static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
+{
+        struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
+
+        nfc_device_iter_exit(iter);
+        kfree(iter);
+
+        return 0;
+}
+
 static struct genl_ops nfc_genl_ops[] = {
         {
                 .cmd = NFC_CMD_GET_DEVICE,
@@ -1265,6 +1350,12 @@ static struct genl_ops nfc_genl_ops[] = {
                 .doit = nfc_genl_disable_se,
                 .policy = nfc_genl_policy,
         },
+        {
+                .cmd = NFC_CMD_GET_SE,
+                .dumpit = nfc_genl_dump_ses,
+                .done = nfc_genl_dump_ses_done,
+                .policy = nfc_genl_policy,
+        },
 };