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authorSamuel Ortiz <sameo@linux.intel.com>2013-07-24 18:10:50 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2013-08-14 00:35:19 +0200
commitac22ac466a659f1b2e02a2e2ee23fc5c42da2c95 (patch)
treecba9976efbda3c184719e23004552061711c5f44 /net/nfc
parent369f4d503ac12363f5d11b91f849377875d57598 (diff)
downloadlinux-ac22ac466a659f1b2e02a2e2ee23fc5c42da2c95.tar.bz2
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>
Diffstat (limited to 'net/nfc')
-rw-r--r--net/nfc/netlink.c91
1 files changed, 91 insertions, 0 deletions
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,
+ },
};