NFC: netlink: SE API implementation
Implementation of the NFC_CMD_SE_IO command for sending ISO7816 APDUs to
NFC embedded secure elements. The reply is forwarded to user space
through NFC_CMD_SE_IO as well.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 68063b2..a3dee05 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -58,6 +58,7 @@
[NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
[NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
.len = NFC_FIRMWARE_NAME_MAXSIZE },
+ [NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
};
static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
@@ -1278,6 +1279,91 @@
return 0;
}
+struct se_io_ctx {
+ u32 dev_idx;
+ u32 se_idx;
+};
+
+void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
+{
+ struct se_io_ctx *ctx = context;
+ struct sk_buff *msg;
+ void *hdr;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg) {
+ kfree(ctx);
+ return;
+ }
+
+ hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
+ NFC_CMD_SE_IO);
+ if (!hdr)
+ goto free_msg;
+
+ if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
+ nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
+ nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
+ goto nla_put_failure;
+
+ genlmsg_end(msg, hdr);
+
+ genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
+
+ kfree(ctx);
+
+ return;
+
+nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+free_msg:
+ nlmsg_free(msg);
+ kfree(ctx);
+
+ return;
+}
+
+static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nfc_dev *dev;
+ struct se_io_ctx *ctx;
+ u32 dev_idx, se_idx;
+ u8 *apdu;
+ size_t apdu_len;
+
+ if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
+ !info->attrs[NFC_ATTR_SE_INDEX] ||
+ !info->attrs[NFC_ATTR_SE_APDU])
+ return -EINVAL;
+
+ dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
+ se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
+
+ dev = nfc_get_device(dev_idx);
+ if (!dev)
+ return -ENODEV;
+
+ if (!dev->ops || !dev->ops->se_io)
+ return -ENOTSUPP;
+
+ apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
+ if (apdu_len == 0)
+ return -EINVAL;
+
+ apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
+ if (!apdu)
+ return -EINVAL;
+
+ ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->dev_idx = dev_idx;
+ ctx->se_idx = se_idx;
+
+ return dev->ops->se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
+}
+
static struct genl_ops nfc_genl_ops[] = {
{
.cmd = NFC_CMD_GET_DEVICE,
@@ -1358,6 +1444,11 @@
.done = nfc_genl_dump_ses_done,
.policy = nfc_genl_policy,
},
+ {
+ .cmd = NFC_CMD_SE_IO,
+ .doit = nfc_genl_se_io,
+ .policy = nfc_genl_policy,
+ },
};