Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / net / wan / hdlc_raw.c

diff --git a/kernel/drivers/net/wan/hdlc_raw.c b/kernel/drivers/net/wan/hdlc_raw.c
new file mode 100644 (file)
index 0000000..5dc153e
--- /dev/null
+++ b/kernel/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");