patch-2.1.15 linux/net/802/llc_macinit.c

• Lines: 226
• Date: Thu Dec 12 16:54:22 1996
• Orig file: v2.1.14/linux/net/802/llc_macinit.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.14/linux/net/802/llc_macinit.c linux/net/802/llc_macinit.c
@@ -0,0 +1,225 @@
+/*
+ * NET		An implementation of the IEEE 802.2 LLC protocol for the
+ *		LINUX operating system.  LLC is implemented as a set of 
+ *		state machines and callbacks for higher networking layers.
+ *
+ *		Code for initialization, termination, registration and 
+ *		MAC layer glue.
+ *
+ *		Written by Tim Alpaerts, Tim_Alpaerts@toyota-motor-europe.com
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ *	Changes
+ *		Alan Cox	:	Chainsawed to Linux format
+ *					Added llc_ to names
+ *					Started restructuring handlers 
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/malloc.h>
+#include <linux/unistd.h>
+#include <linux/netdevice.h>
+#include <net/p8022.h>
+
+#include <asm/byteorder.h>
+
+#include <net/llc_frame.h>
+#include <net/llc.h>
+
+/*
+ *	All incoming frames pass thru mac_data_indicate().
+ *	Here an llc structure is associated with an skb depending on the source
+ *	MAC address in the pdu. 
+ *	The received sk_buffs with pdus other than I_CMD and I_RSP
+ *	are freed by mac_data_indicate() after processing,
+ *	the I pdu buffers are freed by the cl2llc client when it no longer needs
+ *	the skb. 
+*/
+
+int llc_mac_data_indicate(llcptr lp, struct sk_buff *skb, struct device *dev, struct packet_type *pt)
+{
+	int ll;      		/* logical length == 802.3 length field */
+	unsigned char p_flag;
+	unsigned char type;
+	frameptr fr;
+	int free=1;
+	
+	/*
+	 *	Truncate buffer to true 802.3 length  
+	 *	[FIXME: move to 802.2 demux]
+	 */
+	  
+	ll = *(skb->data -2) * 256 + *(skb->data -1);
+	skb_trim( skb, ll );
+
+	fr = (frameptr) skb->data;
+	type = llc_decode_frametype( fr );
+
+
+	if (type <= FRMR_RSP)
+	{
+		/* 
+		 *	PDU is of the type 2 set 
+		 */
+		if ((lp->llc_mode == MODE_ABM)||(type == SABME_CMD)) 
+			llc_process_otype2_frame(lp, skb, type);
+              
+	}
+	else 
+	{
+		/*
+		 *	PDU belongs to type 1 set 
+		 */
+	        p_flag = fr->u_hdr.u_pflag;
+        	switch(type)
+        	{
+		        case TEST_CMD:
+				llc_sendpdu(lp, TEST_RSP, 0,ll -3, 
+					fr->u_hdr.u_info);
+				break;
+			case TEST_RSP:
+				if (lp->ops->test_indication_ep != NULL)
+				{
+					lp->ops->test_indication_ep(lp,
+						ll -3, fr->u_hdr.u_info);
+				}   
+				break;
+			case XID_CMD: 	
+				/*
+				 *	Basic format XID is handled by LLC itself 
+				 *	Doc 5.4.1.1.2 p 48/49 
+				 */
+
+				if ((ll == 6)&&(fr->u_hdr.u_info[0] == 0x81))
+				{
+					lp->k = fr->u_hdr.u_info[2];
+					llc_sendpdu(lp, XID_RSP,
+						fr->u_hdr.u_pflag, ll -3,
+						fr->u_hdr.u_info);
+				}
+				break;
+
+			case XID_RSP:	        
+				if( ll == 6 && fr->u_hdr.u_info[0] == 0x81 )
+				{
+					lp->k = fr->u_hdr.u_info[2]; 
+				}
+				if (lp->ops->xid_indication_ep != NULL)
+				{
+					lp->ops->xid_indication_ep(lp,
+						ll-3, fr->u_hdr.u_info);
+				}
+				break;
+
+			case UI_CMD:
+				if(lp->ops->unit_data_indication_ep != NULL) 
+				{
+					free=lp->ops->unit_data_indication_ep(lp,
+						ll-3, fr->u_hdr.u_info);
+				}
+				break;
+	               
+			default: 
+				/*
+				 *	All other type 1 pdus ignored for now 
+				 */
+		}         
+	}
+	
+	if (free&&(!(IS_IFRAME(fr))))
+	{
+		/*
+		 *	No auto free for I pdus 
+		 */
+		skb->sk = NULL;
+		kfree_skb(skb, FREE_READ);
+	}
+	return 0;
+}
+
+
+/*
+ *	Create an LLC client. As it is the job of the caller to clean up
+ *	LLC's on device down, the device list must be locked before this call.
+ */
+ 
+int register_cl2llc_client(llcptr lp, const char *device, llc_ops *ops, u8 *rmac, u8 ssap, u8 dsap)
+{       
+	char eye_init[] = "LLC\0";
+
+	memset(lp, 0, sizeof(*lp));
+	lp->dev = dev_get(device);
+	if(lp->dev == NULL)
+		return -ENODEV;
+	memcpy(lp->eye, eye_init, sizeof(lp->eye));
+	lp->rw = 1;
+	lp->k = 127;
+	lp->n1 = 1490;
+	lp->n2 = 10;
+	lp->timer_interval[P_TIMER] = HZ;    /* 1 sec */
+	lp->timer_interval[REJ_TIMER] = HZ/8; 
+	lp->timer_interval[ACK_TIMER] = HZ/8;
+	lp->timer_interval[BUSY_TIMER] = HZ*2;
+	lp->local_sap = ssap;
+	lp->ops = ops;
+	lp->remote_mac_len = lp->dev->addr_len; 
+	memcpy(lp->remote_mac, rmac, lp->remote_mac_len);
+	lp->state = 0;
+	lp->llc_mode = MODE_ADM;
+	lp->remote_sap = dsap;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+
+void unregister_cl2llc_client(llcptr lp)
+{
+	llc_cancel_timers(lp);
+	MOD_DEC_USE_COUNT;
+	kfree(lp);
+}
+
+
+static struct symbol_table cl2llc_proto_syms = 
+{
+#include <linux/symtab_begin.h>
+	X(register_cl2llc_client),
+	X(unregister_cl2llc_client),
+	X(llc_data_request),
+	X(llc_unit_data_request),
+	X(llc_test_request),
+	X(llc_xid_request),
+#include <linux/symtab_end.h>
+};
+
+
+#define ALL_TYPES_8022 0
+
+void llc_init(struct net_proto *proto)
+{
+	register_symtab( &cl2llc_proto_syms ); 
+	printk(KERN_NOTICE "IEEE 802.2 LLC for Linux 2.1 (c) 1996 Tim Alpaerts\n");
+	return;        
+}
+
+#ifdef MODULE
+
+
+int init_module(void)
+{
+	llc_init(NULL);
+	return 0;
+}
+
+void cleanup_module(void)
+{
+
+}
+
+#endif