diff options
author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/net/wan/hdlc_x25.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/net/wan/hdlc_x25.c')
-rw-r--r-- | kernel/drivers/net/wan/hdlc_x25.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/kernel/drivers/net/wan/hdlc_x25.c b/kernel/drivers/net/wan/hdlc_x25.c new file mode 100644 index 000000000..a49aec5ef --- /dev/null +++ b/kernel/drivers/net/wan/hdlc_x25.c @@ -0,0 +1,243 @@ +/* + * Generic HDLC support routines for Linux + * X.25 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/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/lapb.h> +#include <linux/module.h> +#include <linux/pkt_sched.h> +#include <linux/poll.h> +#include <linux/rtnetlink.h> +#include <linux/skbuff.h> +#include <net/x25device.h> + +static int x25_ioctl(struct net_device *dev, struct ifreq *ifr); + +/* These functions are callbacks called by LAPB layer */ + +static void x25_connect_disconnect(struct net_device *dev, int reason, int code) +{ + struct sk_buff *skb; + unsigned char *ptr; + + if ((skb = dev_alloc_skb(1)) == NULL) { + netdev_err(dev, "out of memory\n"); + return; + } + + ptr = skb_put(skb, 1); + *ptr = code; + + skb->protocol = x25_type_trans(skb, dev); + netif_rx(skb); +} + + + +static void x25_connected(struct net_device *dev, int reason) +{ + x25_connect_disconnect(dev, reason, X25_IFACE_CONNECT); +} + + + +static void x25_disconnected(struct net_device *dev, int reason) +{ + x25_connect_disconnect(dev, reason, X25_IFACE_DISCONNECT); +} + + + +static int x25_data_indication(struct net_device *dev, struct sk_buff *skb) +{ + unsigned char *ptr; + + skb_push(skb, 1); + + if (skb_cow(skb, 1)) + return NET_RX_DROP; + + ptr = skb->data; + *ptr = X25_IFACE_DATA; + + skb->protocol = x25_type_trans(skb, dev); + return netif_rx(skb); +} + + + +static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb) +{ + hdlc_device *hdlc = dev_to_hdlc(dev); + hdlc->xmit(skb, dev); /* Ignore return value :-( */ +} + + + +static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev) +{ + int result; + + + /* X.25 to LAPB */ + switch (skb->data[0]) { + case X25_IFACE_DATA: /* Data to be transmitted */ + skb_pull(skb, 1); + if ((result = lapb_data_request(dev, skb)) != LAPB_OK) + dev_kfree_skb(skb); + return NETDEV_TX_OK; + + case X25_IFACE_CONNECT: + if ((result = lapb_connect_request(dev))!= LAPB_OK) { + if (result == LAPB_CONNECTED) + /* Send connect confirm. msg to level 3 */ + x25_connected(dev, 0); + else + netdev_err(dev, "LAPB connect request failed, error code = %i\n", + result); + } + break; + + case X25_IFACE_DISCONNECT: + if ((result = lapb_disconnect_request(dev)) != LAPB_OK) { + if (result == LAPB_NOTCONNECTED) + /* Send disconnect confirm. msg to level 3 */ + x25_disconnected(dev, 0); + else + netdev_err(dev, "LAPB disconnect request failed, error code = %i\n", + result); + } + break; + + default: /* to be defined */ + break; + } + + dev_kfree_skb(skb); + return NETDEV_TX_OK; +} + + + +static int x25_open(struct net_device *dev) +{ + int result; + static const struct lapb_register_struct cb = { + .connect_confirmation = x25_connected, + .connect_indication = x25_connected, + .disconnect_confirmation = x25_disconnected, + .disconnect_indication = x25_disconnected, + .data_indication = x25_data_indication, + .data_transmit = x25_data_transmit, + }; + + result = lapb_register(dev, &cb); + if (result != LAPB_OK) + return result; + return 0; +} + + + +static void x25_close(struct net_device *dev) +{ + lapb_unregister(dev); +} + + + +static int x25_rx(struct sk_buff *skb) +{ + struct net_device *dev = skb->dev; + + if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { + dev->stats.rx_dropped++; + return NET_RX_DROP; + } + + if (lapb_data_received(dev, skb) == LAPB_OK) + return NET_RX_SUCCESS; + + dev->stats.rx_errors++; + dev_kfree_skb_any(skb); + return NET_RX_DROP; +} + + +static struct hdlc_proto proto = { + .open = x25_open, + .close = x25_close, + .ioctl = x25_ioctl, + .netif_rx = x25_rx, + .xmit = x25_xmit, + .module = THIS_MODULE, +}; + + +static int x25_ioctl(struct net_device *dev, struct ifreq *ifr) +{ + 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_X25; + return 0; /* return protocol only, no settable parameters */ + + case IF_PROTO_X25: + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + if (dev->flags & IFF_UP) + return -EBUSY; + + result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); + if (result) + return result; + + if ((result = attach_hdlc_protocol(dev, &proto, 0))) + return result; + dev->type = ARPHRD_X25; + 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("X.25 protocol support for generic HDLC"); +MODULE_LICENSE("GPL v2"); |