diff options
Diffstat (limited to '')
-rw-r--r-- | drivers/net/wan/hdlc_raw.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/net/wan/hdlc_raw.c b/drivers/net/wan/hdlc_raw.c new file mode 100644 index 000000000..388fcc09b --- /dev/null +++ b/drivers/net/wan/hdlc_raw.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic HDLC support routines for Linux + * HDLC support + * + * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> + */ + +#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; + call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); + 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"); |