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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/net/wan/hdlc_raw_eth.c
parentInitial commit. (diff)
downloadlinux-upstream.tar.xz
linux-upstream.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--drivers/net/wan/hdlc_raw_eth.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/net/wan/hdlc_raw_eth.c b/drivers/net/wan/hdlc_raw_eth.c
new file mode 100644
index 000000000..0a66b7356
--- /dev/null
+++ b/drivers/net/wan/hdlc_raw_eth.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic HDLC support routines for Linux
+ * HDLC Ethernet emulation support
+ *
+ * Copyright (C) 2002-2006 Krzysztof Halasa <khc@pm.waw.pl>
+ */
+
+#include <linux/errno.h>
+#include <linux/etherdevice.h>
+#include <linux/gfp.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_eth_ioctl(struct net_device *dev, struct if_settings *ifs);
+
+static netdev_tx_t eth_tx(struct sk_buff *skb, struct net_device *dev)
+{
+ int pad = ETH_ZLEN - skb->len;
+ if (pad > 0) { /* Pad the frame with zeros */
+ int len = skb->len;
+ if (skb_tailroom(skb) < pad)
+ if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
+ dev->stats.tx_dropped++;
+ dev_kfree_skb(skb);
+ return 0;
+ }
+ skb_put(skb, pad);
+ memset(skb->data + len, 0, pad);
+ }
+ return dev_to_hdlc(dev)->xmit(skb, dev);
+}
+
+
+static struct hdlc_proto proto = {
+ .type_trans = eth_type_trans,
+ .xmit = eth_tx,
+ .ioctl = raw_eth_ioctl,
+ .module = THIS_MODULE,
+};
+
+
+static int raw_eth_ioctl(struct net_device *dev, struct if_settings *ifs)
+{
+ raw_hdlc_proto __user *raw_s = ifs->ifs_ifsu.raw_hdlc;
+ const size_t size = sizeof(raw_hdlc_proto);
+ raw_hdlc_proto new_settings;
+ hdlc_device *hdlc = dev_to_hdlc(dev);
+ unsigned int old_qlen;
+ int result;
+
+ switch (ifs->type) {
+ case IF_GET_PROTO:
+ if (dev_to_hdlc(dev)->proto != &proto)
+ return -EINVAL;
+ ifs->type = IF_PROTO_HDLC_ETH;
+ if (ifs->size < size) {
+ ifs->size = size; /* data size wanted */
+ return -ENOBUFS;
+ }
+ if (copy_to_user(raw_s, hdlc->state, size))
+ return -EFAULT;
+ return 0;
+
+ case IF_PROTO_HDLC_ETH:
+ 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);
+ old_qlen = dev->tx_queue_len;
+ ether_setup(dev);
+ dev->tx_queue_len = old_qlen;
+ dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+ eth_hw_addr_random(dev);
+ call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
+ netif_dormant_off(dev);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+
+static int __init hdlc_eth_init(void)
+{
+ register_hdlc_protocol(&proto);
+ return 0;
+}
+
+
+
+static void __exit hdlc_eth_exit(void)
+{
+ unregister_hdlc_protocol(&proto);
+}
+
+
+module_init(hdlc_eth_init);
+module_exit(hdlc_eth_exit);
+
+MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
+MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC");
+MODULE_LICENSE("GPL v2");