File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/net/wan/hdlc_raw.c b/drivers/net/wan/hdlc_raw.c
new file mode 100644
index 0000000..5dc153e
--- /dev/null
+++ b/drivers/net/wan/hdlc_raw.c
@@ -0,0 +1,114 @@
+/*
+ * Generic HDLC support routines for Linux
+ * HDLC support
+ *
+ * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/errno.h>
+#include <linux/hdlc.h>
+#include <linux/if_arp.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pkt_sched.h>
+#include <linux/poll.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+
+
+static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
+
+static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
+{
+ return cpu_to_be16(ETH_P_IP);
+}
+
+static struct hdlc_proto proto = {
+ .type_trans = raw_type_trans,
+ .ioctl = raw_ioctl,
+ .module = THIS_MODULE,
+};
+
+
+static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
+{
+ raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
+ const size_t size = sizeof(raw_hdlc_proto);
+ raw_hdlc_proto new_settings;
+ hdlc_device *hdlc = dev_to_hdlc(dev);
+ int result;
+
+ switch (ifr->ifr_settings.type) {
+ case IF_GET_PROTO:
+ if (dev_to_hdlc(dev)->proto != &proto)
+ return -EINVAL;
+ ifr->ifr_settings.type = IF_PROTO_HDLC;
+ if (ifr->ifr_settings.size < size) {
+ ifr->ifr_settings.size = size; /* data size wanted */
+ return -ENOBUFS;
+ }
+ if (copy_to_user(raw_s, hdlc->state, size))
+ return -EFAULT;
+ return 0;
+
+ case IF_PROTO_HDLC:
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (dev->flags & IFF_UP)
+ return -EBUSY;
+
+ if (copy_from_user(&new_settings, raw_s, size))
+ return -EFAULT;
+
+ if (new_settings.encoding == ENCODING_DEFAULT)
+ new_settings.encoding = ENCODING_NRZ;
+
+ if (new_settings.parity == PARITY_DEFAULT)
+ new_settings.parity = PARITY_CRC16_PR1_CCITT;
+
+ result = hdlc->attach(dev, new_settings.encoding,
+ new_settings.parity);
+ if (result)
+ return result;
+
+ result = attach_hdlc_protocol(dev, &proto,
+ sizeof(raw_hdlc_proto));
+ if (result)
+ return result;
+ memcpy(hdlc->state, &new_settings, size);
+ dev->type = ARPHRD_RAWHDLC;
+ netif_dormant_off(dev);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+
+static int __init mod_init(void)
+{
+ register_hdlc_protocol(&proto);
+ return 0;
+}
+
+
+
+static void __exit mod_exit(void)
+{
+ unregister_hdlc_protocol(&proto);
+}
+
+
+module_init(mod_init);
+module_exit(mod_exit);
+
+MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
+MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
+MODULE_LICENSE("GPL v2");