NFC: Add a GET_SE netlink API
In order to fetch the discovered secure elements from an NFC controller, we need to send a netlink command that will dump the list of available SEs from NFC. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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@ -84,6 +84,7 @@
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* @NFC_EVENT_SE_TRANSACTION: This event is sent when an application running on
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* a specific SE notifies us about the end of a transaction. The parameter
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* for this event is the application ID (AID).
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* @NFC_CMD_GET_SE: Dump all discovered secure elements from an NFC controller.
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*/
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enum nfc_commands {
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NFC_CMD_UNSPEC,
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@ -112,6 +113,7 @@ enum nfc_commands {
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NFC_EVENT_SE_REMOVED,
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NFC_EVENT_SE_CONNECTIVITY,
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NFC_EVENT_SE_TRANSACTION,
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NFC_CMD_GET_SE,
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/* private: internal use only */
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__NFC_CMD_AFTER_LAST
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};
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@ -1191,6 +1191,91 @@ static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
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return rc;
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}
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static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
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u32 portid, u32 seq,
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struct netlink_callback *cb,
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int flags)
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{
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void *hdr;
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struct nfc_se *se, *n;
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list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
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hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
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NFC_CMD_GET_SE);
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if (!hdr)
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goto nla_put_failure;
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if (cb)
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genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
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if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
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nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
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nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
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goto nla_put_failure;
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if (genlmsg_end(msg, hdr) < 0)
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goto nla_put_failure;
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}
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return 0;
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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return -EMSGSIZE;
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}
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static int nfc_genl_dump_ses(struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
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struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
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bool first_call = false;
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if (!iter) {
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first_call = true;
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iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
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if (!iter)
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return -ENOMEM;
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cb->args[0] = (long) iter;
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}
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mutex_lock(&nfc_devlist_mutex);
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cb->seq = nfc_devlist_generation;
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if (first_call) {
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nfc_device_iter_init(iter);
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dev = nfc_device_iter_next(iter);
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}
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while (dev) {
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int rc;
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rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
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if (rc < 0)
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break;
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dev = nfc_device_iter_next(iter);
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}
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mutex_unlock(&nfc_devlist_mutex);
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cb->args[1] = (long) dev;
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return skb->len;
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}
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static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
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{
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struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
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nfc_device_iter_exit(iter);
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kfree(iter);
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return 0;
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}
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static struct genl_ops nfc_genl_ops[] = {
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{
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.cmd = NFC_CMD_GET_DEVICE,
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@ -1265,6 +1350,12 @@ static struct genl_ops nfc_genl_ops[] = {
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.doit = nfc_genl_disable_se,
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.policy = nfc_genl_policy,
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},
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{
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.cmd = NFC_CMD_GET_SE,
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.dumpit = nfc_genl_dump_ses,
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.done = nfc_genl_dump_ses_done,
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.policy = nfc_genl_policy,
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},
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};
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