o LLC: trim down llc_core to the very basic support needed by IPX et all

Renaming the basic support module to llc.ko and introducing llc_core.c,
that has just the basic output path for llc_build_and_send_ui_pkt.

Next step will be to rename llc_main.c to llc_station.c, then consolidate
all the llc station code in this file, removing all the not needed
llc_station parameters and killing struct llc_station altogether,
no sense in having it as there is just one station, always. BTW in
this changeset parts of llc_main_station was already moved to llc_core.c,
namely the sap list and lock.

drivers/net/tokenring/Kconfig

@@ -9,7 +9,7 @@ menu "Token Ring devices"
 config TR
 	bool "Token Ring driver support"
 	depends on (PCI || ISA || MCA || CCW)
-	select LLC_CORE
+	select LLC
 	help
 	  Token Ring is IBM's way of communication on a local network; the
 	  rest of the world uses Ethernet. To participate on a Token Ring

include/net/llc.h

@@ -12,15 +12,55 @@
  * See the GNU General Public License for more details.
  */
 
-#define LLC_DEST_INVALID         0      /* Invalid LLC PDU type */
-#define LLC_DEST_SAP             1      /* Type 1 goes here */
-#define LLC_DEST_CONN            2      /* Type 2 goes here */
+#include <linux/if.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
 
-struct llc_sap;
 struct net_device;
 struct packet_type;
 struct sk_buff;
 
+struct llc_addr {
+	unsigned char lsap;
+	unsigned char mac[IFHWADDRLEN];
+};
+
+#define LLC_SAP_STATE_INACTIVE	1
+#define LLC_SAP_STATE_ACTIVE	2
+
+/**
+ * struct llc_sap - Defines the SAP component
+ *
+ * @station - station this sap belongs to
+ * @state - sap state
+ * @p_bit - only lowest-order bit used
+ * @f_bit - only lowest-order bit used
+ * @laddr - SAP value in this 'lsap'
+ * @node - entry in station sap_list
+ * @sk_list - LLC sockets this one manages
+ */
+struct llc_sap {
+	unsigned char	 state;
+	unsigned char	 p_bit;
+	unsigned char	 f_bit;
+	int		 (*rcv_func)(struct sk_buff *skb,
+				     struct net_device *dev,
+				     struct packet_type *pt);
+	struct llc_addr	 laddr;
+	struct list_head node;
+	struct {
+		rwlock_t	  lock;
+		struct hlist_head list;
+	} sk_list;
+};
+
+#define LLC_DEST_INVALID         0      /* Invalid LLC PDU type */
+#define LLC_DEST_SAP             1      /* Type 1 goes here */
+#define LLC_DEST_CONN            2      /* Type 2 goes here */
+
+extern struct list_head llc_sap_list;
+extern rwlock_t llc_sap_list_lock;
+
 extern int llc_rcv(struct sk_buff *skb, struct net_device *dev,
 		   struct packet_type *pt);
 
@@ -29,4 +69,13 @@ extern void llc_add_pack(int type, void (*handler)(struct llc_sap *sap,
 extern void llc_remove_pack(int type);
 
 extern void llc_set_station_handler(void (*handler)(struct sk_buff *skb));
+
+extern struct llc_sap *llc_sap_open(unsigned char lsap,
+				    int (*rcv)(struct sk_buff *skb,
+					       struct net_device *dev,
+					       struct packet_type *pt));
+extern void llc_sap_close(struct llc_sap *sap);
+
+extern int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
+				     unsigned char *dmac, unsigned char dsap);
 #endif /* LLC_H */

include/net/llc_evnt.h

@@ -45,6 +45,8 @@ static __inline__ struct llc_station_state_ev *
 	return (struct llc_station_state_ev *)skb->cb;
 }
 
+struct llc_station;
+
 typedef int (*llc_station_ev_t)(struct llc_station *station,
 				struct sk_buff *skb);
 

include/net/llc_if.h

@@ -16,6 +16,7 @@
 #include <linux/if.h>
 #include <linux/if_arp.h>
 #include <linux/llc.h>
+#include <net/llc.h>
 
 #define LLC_DATAUNIT_PRIM	1
 #define LLC_CONN_PRIM		2
@@ -60,13 +61,6 @@
 #define LLC_STATUS_CONFLICT	7 /* disconnect conn */
 #define LLC_STATUS_RESET_DONE	8 /*  */
 
-/* Structures and types */
-/* SAP/MAC Address pair */
-struct llc_addr {
-	u8 lsap;
-	u8 mac[IFHWADDRLEN];
-};
-
 extern u8 llc_mac_null_var[IFHWADDRLEN];
 
 /**

include/net/llc_main.h

@@ -11,6 +11,9 @@
  *
  * See the GNU General Public License for more details.
  */
+
+#include <linux/skbuff.h>
+
 #define LLC_EVENT		 1
 #define LLC_PACKET		 2
 #define LLC_TYPE_1		 1
@@ -39,10 +42,6 @@ struct llc_station {
 	u8			    retry_count;
 	u8			    maximum_retry;
 	u8			    mac_sa[6];
-	struct {
-		rwlock_t	    lock;
-		struct list_head    list;
-	} sap_list;
 	struct {
 		struct sk_buff_head list;
 		spinlock_t	    lock;
@@ -50,15 +49,10 @@ struct llc_station {
 	struct sk_buff_head	    mac_pdu_q;
 };
 
-extern struct llc_sap *llc_sap_alloc(void);
-extern void llc_sap_save(struct llc_sap *sap);
-extern void llc_free_sap(struct llc_sap *sap);
-extern struct llc_sap *llc_sap_find(u8 lsap);
 extern void llc_station_state_process(struct llc_station *station,
 				      struct sk_buff *skb);
 extern void llc_station_send_pdu(struct llc_station *station,
 				 struct sk_buff *skb);
-extern struct sk_buff *llc_alloc_frame(void);
-
-extern struct llc_station llc_main_station;
+extern int __init llc_station_init(void);
+extern void __exit llc_station_exit(void);
 #endif /* LLC_MAIN_H */

include/net/llc_s_st.h

@@ -11,10 +11,7 @@
  *
  * See the GNU General Public License for more details.
  */
-/* Defines SAP component states */
 
-#define LLC_SAP_STATE_INACTIVE	1
-#define LLC_SAP_STATE_ACTIVE	2
 #define LLC_NR_SAP_STATES	2       /* size of state table */
 
 /* structures and types */

include/net/llc_sap.h

@@ -2,7 +2,7 @@
 #define LLC_SAP_H
 /*
  * Copyright (c) 1997 by Procom Technology,Inc.
- * 		 2001 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ * 		 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  *
  * This program can be redistributed or modified under the terms of the
  * GNU General Public License as published by the Free Software Foundation.
@@ -11,50 +11,20 @@
  *
  * See the GNU General Public License for more details.
  */
-#include <linux/skbuff.h>
-#include <net/llc_if.h>
-/**
- * struct llc_sap - Defines the SAP component
- *
- * @station - station this sap belongs to
- * @state - sap state
- * @p_bit - only lowest-order bit used
- * @f_bit - only lowest-order bit used
- * @laddr - SAP value in this 'lsap'
- * @node - entry in station sap_list
- * @sk_list - LLC sockets this one manages
- */
-struct llc_sap {
-	struct llc_station *station;
-	u8		    state;
-	u8		    p_bit;
-	u8		    f_bit;
-	int		    (*rcv_func)(struct sk_buff *skb,
-					struct net_device *dev,
-					struct packet_type *pt);
-	struct llc_addr	    laddr;
-	struct list_head    node;
-	struct {
-		rwlock_t	  lock;
-		struct hlist_head list;
-	} sk_list;
-};
+struct llc_sap;
+struct sk_buff;
 
 extern void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb);
 extern void llc_sap_rtn_pdu(struct llc_sap *sap, struct sk_buff *skb);
-extern void llc_save_primitive(struct sk_buff* skb, u8 prim);
+extern void llc_save_primitive(struct sk_buff* skb, unsigned char prim);
+extern struct sk_buff *llc_alloc_frame(void);
 
-extern struct llc_sap *llc_sap_open(u8 lsap,
-				    int (*rcv)(struct sk_buff *skb,
-					       struct net_device *dev,
-					       struct packet_type *pt));
-extern void llc_sap_close(struct llc_sap *sap);
-
-extern void llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
-				      u8 *dmac, u8 dsap);
-extern void llc_build_and_send_xid_pkt(struct llc_sap *sap, struct sk_buff *skb,
-				       u8 *dmac, u8 dsap);
 extern void llc_build_and_send_test_pkt(struct llc_sap *sap,
-					struct sk_buff *skb, u8 *dmac, u8 dsap);
-
+				        struct sk_buff *skb,
+					unsigned char *dmac,
+					unsigned char dsap);
+extern void llc_build_and_send_xid_pkt(struct llc_sap *sap,
+				       struct sk_buff *skb,
+				       unsigned char *dmac,
+				       unsigned char dsap);
 #endif /* LLC_SAP_H */

net/802/p8022.c

@@ -22,8 +22,8 @@
 #include <linux/mm.h>
 #include <linux/in.h>
 #include <linux/init.h>
+#include <net/llc.h>
 #include <net/p8022.h>
-#include <net/llc_sap.h>
 
 static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb,
 			 unsigned char *dest)

net/802/psnap.c

@@ -15,8 +15,8 @@
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <net/datalink.h>
+#include <net/llc.h>
 #include <net/psnap.h>
-#include <net/llc_sap.h>
 #include <linux/mm.h>
 #include <linux/in.h>
 #include <linux/init.h>

net/Kconfig

@@ -374,7 +374,7 @@ source "net/llc/Kconfig"
 
 config IPX
 	tristate "The IPX protocol"
-	select LLC_CORE
+	select LLC
 	---help---
 	  This is support for the Novell networking protocol, IPX, commonly
 	  used for local networks of Windows machines.  You need it if you
@@ -411,7 +411,7 @@ source "net/ipx/Kconfig"
 
 config ATALK
 	tristate "Appletalk protocol support"
-	select LLC_CORE
+	select LLC
 	---help---
 	  AppleTalk is the protocol that Apple computers can use to communicate
 	  on a network.  If your Linux box is connected to such a network and you

net/Makefile

@@ -12,7 +12,7 @@ obj-$(CONFIG_NET)		:= socket.o core/
 obj-$(CONFIG_COMPAT)		+= compat.o
 
 # LLC has to be linked before the files in net/802/
-obj-$(CONFIG_LLC_CORE)		+= llc/
+obj-$(CONFIG_LLC)		+= llc/
 obj-$(CONFIG_NET)		+= ethernet/ 802/ sched/ netlink/
 obj-$(CONFIG_INET)		+= ipv4/ xfrm/
 obj-$(CONFIG_UNIX)		+= unix/

net/llc/Kconfig

-config LLC_CORE
+config LLC
 	tristate
 	depends on NET
 
 config LLC2
 	tristate "ANSI/IEEE 802.2 LLC type 2 Support"
-	select LLC_CORE
+	select LLC
 	help
 	  This is a Logical Link Layer type 2, connection oriented support. 
 	  Select this if you want to have support for PF_LLC sockets.

net/llc/Makefile

@@ -12,14 +12,14 @@
 # See the GNU General Public License for more details.
 ###########################################################################
 
-obj-$(CONFIG_LLC_CORE) += llc_core.o
+obj-$(CONFIG_LLC) += llc.o
 
-llc_core-y := llc_input.o llc_output.o llc_s_st.o llc_s_ac.o llc_s_ev.o \
-	      llc_main.o llc_actn.o llc_stat.o llc_evnt.o llc_sap.o
+llc-y := llc_core.o llc_input.o llc_output.o
 
 obj-$(CONFIG_LLC2) += llc2.o
 
 llc2-y := llc_if.o llc_c_ev.o llc_c_ac.o llc_conn.o llc_c_st.o llc_pdu.o \
-	  af_llc.o
+	  llc_sap.o llc_s_ac.o llc_s_ev.o llc_s_st.o af_llc.o llc_main.o \
+	  llc_actn.o llc_stat.o llc_evnt.o
 
 llc2-$(CONFIG_PROC_FS) += llc_proc.o

net/llc/af_llc.c

@@ -1053,6 +1053,7 @@ static int __init llc2_init(void)
 	int rc;
 
 	llc_build_offset_table();
+	llc_station_init();
 	llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
 	rc = llc_proc_init();
 	if (!rc) {
@@ -1065,6 +1066,7 @@ static int __init llc2_init(void)
 
 static void __exit llc2_exit(void)
 {
+	llc_station_exit();
 	llc_remove_pack(LLC_DEST_SAP);
 	llc_remove_pack(LLC_DEST_CONN);
 	sock_unregister(PF_LLC);

net/llc/llc_core.c

+/*
+ * llc_core.c - Minimum needed routines for sap handling and module init/exit
+ *
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ * 		 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * This program can be redistributed or modified under the terms of the
+ * GNU General Public License as published by the Free Software Foundation.
+ * This program is distributed without any warranty or implied warranty
+ * of merchantability or fitness for a particular purpose.
+ *
+ * See the GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <net/llc.h>
+
+LIST_HEAD(llc_sap_list);
+rwlock_t llc_sap_list_lock = RW_LOCK_UNLOCKED;
+
+unsigned char llc_station_mac_sa[ETH_ALEN];
+
+/**
+ *	llc_sap_alloc - allocates and initializes sap.
+ *
+ *	Allocates and initializes sap.
+ */
+struct llc_sap *llc_sap_alloc(void)
+{
+	struct llc_sap *sap = kmalloc(sizeof(*sap), GFP_ATOMIC);
+
+	if (sap) {
+		memset(sap, 0, sizeof(*sap));
+		sap->state = LLC_SAP_STATE_ACTIVE;
+		memcpy(sap->laddr.mac, llc_station_mac_sa, ETH_ALEN);
+		rwlock_init(&sap->sk_list.lock);
+	}
+	return sap;
+}
+
+/**
+ *	llc_add_sap - add sap to station list
+ *	@sap: Address of the sap
+ *
+ *	Adds a sap to the LLC's station sap list.
+ */
+void llc_add_sap(struct llc_sap *sap)
+{
+	write_lock_bh(&llc_sap_list_lock);
+	list_add_tail(&sap->node, &llc_sap_list);
+	write_unlock_bh(&llc_sap_list_lock);
+}
+
+/**
+ *	llc_del_sap - del sap from station list
+ *	@sap: Address of the sap
+ *
+ *	Removes a sap to the LLC's station sap list.
+ */
+void llc_del_sap(struct llc_sap *sap)
+{
+	write_lock_bh(&llc_sap_list_lock);
+	list_del(&sap->node);
+	write_unlock_bh(&llc_sap_list_lock);
+}
+
+/**
+ *	llc_sap_find - searchs a SAP in station
+ *	@sap_value: sap to be found
+ *
+ *	Searchs for a sap in the sap list of the LLC's station upon the sap ID.
+ *	Returns the sap or %NULL if not found.
+ */
+struct llc_sap *llc_sap_find(unsigned char sap_value)
+{
+	struct llc_sap* sap = NULL;
+	struct list_head *entry;
+
+	read_lock_bh(&llc_sap_list_lock);
+	list_for_each(entry, &llc_sap_list) {
+		sap = list_entry(entry, struct llc_sap, node);
+		if (sap->laddr.lsap == sap_value)
+			break;
+	}
+	if (entry == &llc_sap_list) /* not found */
+		sap = NULL;
+	read_unlock_bh(&llc_sap_list_lock);
+	return sap;
+}
+
+/**
+ *	llc_sap_open - open interface to the upper layers.
+ *	@lsap: SAP number.
+ *	@func: rcv func for datalink protos
+ *
+ *	Interface function to upper layer. Each one who wants to get a SAP
+ *	(for example NetBEUI) should call this function. Returns the opened
+ *	SAP for success, NULL for failure.
+ */
+struct llc_sap *llc_sap_open(unsigned char lsap,
+			     int (*func)(struct sk_buff *skb,
+					 struct net_device *dev,
+					 struct packet_type *pt))
+{
+	struct llc_sap *sap = llc_sap_find(lsap);
+
+	if (sap) { /* SAP already exists */
+		sap = NULL;
+		goto out;
+	}
+	sap = llc_sap_alloc();
+	if (!sap)
+		goto out;
+	sap->laddr.lsap = lsap;
+	sap->rcv_func	= func;
+	llc_add_sap(sap);
+out:
+	return sap;
+}
+
+/**
+ *	llc_sap_close - close interface for upper layers.
+ *	@sap: SAP to be closed.
+ *
+ *	Close interface function to upper layer. Each one who wants to
+ *	close an open SAP (for example NetBEUI) should call this function.
+ * 	Removes this sap from the list of saps in the station and then
+ * 	frees the memory for this sap.
+ */
+void llc_sap_close(struct llc_sap *sap)
+{
+	WARN_ON(!hlist_empty(&sap->sk_list.list));
+	llc_del_sap(sap);
+	kfree(sap);
+}
+
+static struct packet_type llc_packet_type = {
+	.type = __constant_htons(ETH_P_802_2),
+	.func = llc_rcv,
+	.data = (void *)1,
+};
+
+static struct packet_type llc_tr_packet_type = {
+	.type = __constant_htons(ETH_P_TR_802_2),
+	.func = llc_rcv,
+	.data = (void *)1,
+};
+
+static int __init llc_init(void)
+{
+	if (dev_base->next)
+		memcpy(llc_station_mac_sa, dev_base->next->dev_addr, ETH_ALEN);
+	else
+		memset(llc_station_mac_sa, 0, ETH_ALEN);
+	dev_add_pack(&llc_packet_type);
+	dev_add_pack(&llc_tr_packet_type);
+	return 0;
+}
+
+static void __exit llc_exit(void)
+{
+	dev_remove_pack(&llc_packet_type);
+	dev_remove_pack(&llc_tr_packet_type);
+}
+
+module_init(llc_init);
+module_exit(llc_exit);
+
+EXPORT_SYMBOL(llc_sap_list);
+EXPORT_SYMBOL(llc_sap_list_lock);
+EXPORT_SYMBOL(llc_sap_find);
+EXPORT_SYMBOL(llc_sap_open);
+EXPORT_SYMBOL(llc_sap_close);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
+MODULE_DESCRIPTION("LLC IEEE 802.2 core support");

net/llc/llc_main.c

@@ -43,44 +43,8 @@ static u16 llc_exec_station_trans_actions(struct llc_station *station,
 static struct llc_station_state_trans *
 			     llc_find_station_trans(struct llc_station *station,
 						    struct sk_buff *skb);
-struct llc_station llc_main_station;	/* only one of its kind */
 
-/**
- *	llc_sap_save - add sap to station list
- *	@sap: Address of the sap
- *
- *	Adds a sap to the LLC's station sap list.
- */
-void llc_sap_save(struct llc_sap *sap)
-{
-	write_lock_bh(&llc_main_station.sap_list.lock);
-	list_add_tail(&sap->node, &llc_main_station.sap_list.list);
-	write_unlock_bh(&llc_main_station.sap_list.lock);
-}
-
-/**
- *	llc_sap_find - searchs a SAP in station
- *	@sap_value: sap to be found
- *
- *	Searchs for a sap in the sap list of the LLC's station upon the sap ID.
- *	Returns the sap or %NULL if not found.
- */
-struct llc_sap *llc_sap_find(u8 sap_value)
-{
-	struct llc_sap* sap = NULL;
-	struct list_head *entry;
-
-	read_lock_bh(&llc_main_station.sap_list.lock);
-	list_for_each(entry, &llc_main_station.sap_list.list) {
-		sap = list_entry(entry, struct llc_sap, node);
-		if (sap->laddr.lsap == sap_value)
-			break;
-	}
-	if (entry == &llc_main_station.sap_list.list) /* not found */
-		sap = NULL;
-	read_unlock_bh(&llc_main_station.sap_list.lock);
-	return sap;
-}
+static struct llc_station llc_main_station;
 
 /**
  *	llc_station_state_process: queue event and try to process queue.
@@ -265,49 +229,12 @@ static void llc_station_rcv(struct sk_buff *skb)
 	llc_station_state_process(&llc_main_station, skb);
 }
 
-/**
- *	llc_alloc_frame - allocates sk_buff for frame
- *
- *	Allocates an sk_buff for frame and initializes sk_buff fields.
- *	Returns allocated skb or %NULL when out of memory.
- */
-struct sk_buff *llc_alloc_frame(void)
-{
-	struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC);
-
-	if (skb) {
-		skb_reserve(skb, 50);
-		skb->nh.raw   = skb->h.raw = skb->data;
-		skb->protocol = htons(ETH_P_802_2);
-		skb->dev      = dev_base->next;
-		skb->mac.raw  = skb->head;
-	}
-	return skb;
-}
-
-static struct packet_type llc_packet_type = {
-	.type = __constant_htons(ETH_P_802_2),
-	.func = llc_rcv,
-	.data = (void *)1,
-};
-
-static struct packet_type llc_tr_packet_type = {
-	.type = __constant_htons(ETH_P_TR_802_2),
-	.func = llc_rcv,
-	.data = (void *)1,
-};
-
-static char llc_error_msg[] __initdata =
-		KERN_ERR "LLC install NOT successful.\n";
-
-static int __init llc_init(void)
+int __init llc_station_init(void)
 {
-	u16 rc = 0;
+	u16 rc = -ENOBUFS;
 	struct sk_buff *skb;
 	struct llc_station_state_ev *ev;
 
-	INIT_LIST_HEAD(&llc_main_station.sap_list.list);
-	rwlock_init(&llc_main_station.sap_list.lock);
 	skb_queue_head_init(&llc_main_station.mac_pdu_q);
 	skb_queue_head_init(&llc_main_station.ev_q.list);
 	spin_lock_init(&llc_main_station.ev_q.lock);
@@ -317,46 +244,22 @@ static int __init llc_init(void)
 
 	skb = alloc_skb(0, GFP_ATOMIC);
 	if (!skb)
-		goto err;
+		goto out;
+	rc = 0;
 	llc_set_station_handler(llc_station_rcv);
 	ev = llc_station_ev(skb);
 	memset(ev, 0, sizeof(*ev));
-	if (dev_base->next)
-		memcpy(llc_main_station.mac_sa,
-		       dev_base->next->dev_addr, ETH_ALEN);
-	else
-		memset(llc_main_station.mac_sa, 0, ETH_ALEN);
 	llc_main_station.ack_timer.expires = jiffies + 3 * HZ;
 	llc_main_station.maximum_retry	= 1;
 	llc_main_station.state		= LLC_STATION_STATE_DOWN;
 	ev->type	= LLC_STATION_EV_TYPE_SIMPLE;
 	ev->prim_type	= LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK;
 	rc = llc_station_next_state(&llc_main_station, skb);
-	dev_add_pack(&llc_packet_type);
-	dev_add_pack(&llc_tr_packet_type);
 out:
 	return rc;
-err:
-	printk(llc_error_msg);
-	rc = 1;
-	goto out;
 }
 
-static void __exit llc_exit(void)
+void __exit llc_station_exit(void)
 {
-	dev_remove_pack(&llc_packet_type);
-	dev_remove_pack(&llc_tr_packet_type);
 	llc_set_station_handler(NULL);
 }
-
-module_init(llc_init);
-module_exit(llc_exit);
-
-EXPORT_SYMBOL(llc_sap_find);
-EXPORT_SYMBOL(llc_alloc_frame);
-EXPORT_SYMBOL(llc_main_station);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
-MODULE_DESCRIPTION("LLC IEEE 802.2 extended support");
-MODULE_ALIAS_NETPROTO(PF_LLC);

net/llc/llc_output.c

 /*
- * llc_output.c - LLC output path
+ * llc_output.c - LLC minimal output path
  *
  * Copyright (c) 1997 by Procom Technology, Inc.
  * 		 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
@@ -17,6 +17,8 @@
 #include <linux/if_tr.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
+#include <net/llc.h>
+#include <net/llc_pdu.h>
 
 /**
  *	llc_mac_hdr_init - fills MAC header fields
@@ -72,4 +74,32 @@ int llc_mac_hdr_init(struct sk_buff *skb, unsigned char *sa, unsigned char *da)
 	return rc;
 }
 
+/**
+ *	llc_build_and_send_ui_pkt - unitdata request interface for upper layers
+ *	@sap: sap to use
+ *	@skb: packet to send
+ *	@dmac: destination mac address
+ *	@dsap: destination sap
+ *
+ *	Upper layers calls this function when upper layer wants to send data
+ *	using connection-less mode communication (UI pdu).
+ *
+ *	Accept data frame from network layer to be sent using connection-
+ *	less mode communication; timeout/retries handled by network layer;
+ *	package primitive as an event and send to SAP event handler
+ */
+int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
+			      unsigned char *dmac, unsigned char dsap)
+{
+	int rc;
+	llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap,
+			    dsap, LLC_PDU_CMD);
+	llc_pdu_init_as_ui_cmd(skb);
+	rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
+	if (!rc)
+		rc = dev_queue_xmit(skb);
+	return rc;
+}
+
 EXPORT_SYMBOL(llc_mac_hdr_init);
+EXPORT_SYMBOL(llc_build_and_send_ui_pkt);

net/llc/llc_proc.c

@@ -20,12 +20,11 @@
 #include <linux/errno.h>
 #include <linux/seq_file.h>
 #include <net/sock.h>
+#include <net/llc.h>
 #include <net/llc_c_ac.h>
 #include <net/llc_c_ev.h>
 #include <net/llc_c_st.h>
 #include <net/llc_conn.h>
-#include <net/llc_main.h>
-#include <net/llc_sap.h>
 
 static void llc_ui_format_mac(struct seq_file *seq, unsigned char *mac)
 {
@@ -40,7 +39,7 @@ static struct sock *llc_get_sk_idx(loff_t pos)
 	struct hlist_node *node;
 	struct sock *sk = NULL;
 
-	list_for_each(sap_entry, &llc_main_station.sap_list.list) {
+	list_for_each(sap_entry, &llc_sap_list) {
 		sap = list_entry(sap_entry, struct llc_sap, node);
 
 		read_lock_bh(&sap->sk_list.lock);
@@ -65,7 +64,7 @@ static void *llc_seq_start(struct seq_file *seq, loff_t *pos)
 {
 	loff_t l = *pos;
 
-	read_lock_bh(&llc_main_station.sap_list.lock);
+	read_lock_bh(&llc_sap_list_lock);
 	return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
 }
 
@@ -91,7 +90,7 @@ static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 	read_unlock_bh(&sap->sk_list.lock);
 	sk = NULL;
 	for (;;) {
-		if (sap->node.next == &llc_main_station.sap_list.list)
+		if (sap->node.next == &llc_sap_list)
 			break;
 		sap = list_entry(sap->node.next, struct llc_sap, node);
 		read_lock_bh(&sap->sk_list.lock);
@@ -114,7 +113,7 @@ static void llc_seq_stop(struct seq_file *seq, void *v)
 
 		read_unlock_bh(&sap->sk_list.lock);
 	}
-	read_unlock_bh(&llc_main_station.sap_list.lock);
+	read_unlock_bh(&llc_sap_list_lock);
 }
 
 static int llc_seq_socket_show(struct seq_file *seq, void *v)

net/llc/llc_sap.c

@@ -23,6 +23,26 @@
 #include <net/llc_pdu.h>
 #include <linux/if_tr.h>
 
+/**
+ *	llc_alloc_frame - allocates sk_buff for frame
+ *
+ *	Allocates an sk_buff for frame and initializes sk_buff fields.
+ *	Returns allocated skb or %NULL when out of memory.
+ */
+struct sk_buff *llc_alloc_frame(void)
+{
+	struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC);
+
+	if (skb) {
+		skb_reserve(skb, 50);
+		skb->nh.raw   = skb->h.raw = skb->data;
+		skb->protocol = htons(ETH_P_802_2);
+		skb->dev      = dev_base->next;
+		skb->mac.raw  = skb->head;
+	}
+	return skb;
+}
+
 void llc_save_primitive(struct sk_buff* skb, u8 prim)
 {
 	struct sockaddr_llc *addr = llc_ui_skb_cb(skb);
@@ -180,36 +200,6 @@ void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb)
 	kfree_skb(skb);
 }
 
-/**
- *	llc_build_and_send_ui_pkt - unitdata request interface for upper layers
- *	@sap: sap to use
- *	@skb: packet to send
- *	@dmac: destination mac address
- *	@dsap: destination sap
- *
- *	Upper layers calls this function when upper layer wants to send data
- *	using connection-less mode communication (UI pdu).
- *
- *	Accept data frame from network layer to be sent using connection-
- *	less mode communication; timeout/retries handled by network layer;
- *	package primitive as an event and send to SAP event handler
- */
-void llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
-			       u8 *dmac, u8 dsap)
-{
-	struct llc_sap_state_ev *ev = llc_sap_ev(skb);
-
-	ev->saddr.lsap = sap->laddr.lsap;
-	ev->daddr.lsap = dsap;
-	memcpy(ev->saddr.mac, skb->dev->dev_addr, IFHWADDRLEN);
-	memcpy(ev->daddr.mac, dmac, IFHWADDRLEN);
-
-	ev->type      = LLC_SAP_EV_TYPE_PRIM;
-	ev->prim      = LLC_DATAUNIT_PRIM;
-	ev->prim_type = LLC_PRIM_TYPE_REQ;
-	llc_sap_state_process(sap, skb);
-}
-
 /**
  *	llc_build_and_send_test_pkt - TEST interface for upper layers.
  *	@sap: sap to use
@@ -325,79 +315,6 @@ void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb)
 		kfree_skb(skb);
 }
 
-/**
- *	llc_sap_alloc - allocates and initializes sap.
- *
- *	Allocates and initializes sap.
- */
-struct llc_sap *llc_sap_alloc(void)
-{
-	struct llc_sap *sap = kmalloc(sizeof(*sap), GFP_ATOMIC);
-
-	if (sap) {
-		memset(sap, 0, sizeof(*sap));
-		sap->state = LLC_SAP_STATE_ACTIVE;
-		memcpy(sap->laddr.mac, llc_main_station.mac_sa, ETH_ALEN);
-		rwlock_init(&sap->sk_list.lock);
-	}
-	return sap;
-}
-
-/**
- *	llc_sap_open - open interface to the upper layers.
- *	@lsap: SAP number.
- *	@func: rcv func for datalink protos
- *
- *	Interface function to upper layer. Each one who wants to get a SAP
- *	(for example NetBEUI) should call this function. Returns the opened
- *	SAP for success, NULL for failure.
- */
-struct llc_sap *llc_sap_open(u8 lsap, int (*func)(struct sk_buff *skb,
-						  struct net_device *dev,
-						  struct packet_type *pt))
-{
-	/* verify this SAP is not already open; if so, return error */
-	struct llc_sap *sap;
-
-	sap = llc_sap_find(lsap);
-	if (sap) { /* SAP already exists */
-		sap = NULL;
-		goto out;
-	}
-	/* sap requested does not yet exist */
-	sap = llc_sap_alloc();
-	if (!sap)
-		goto out;
-	/* allocated a SAP; initialize it and clear out its memory pool */
-	sap->laddr.lsap = lsap;
-	sap->rcv_func	= func;
-	sap->station	= &llc_main_station;
-	/* initialized SAP; add it to list of SAPs this station manages */
-	llc_sap_save(sap);
-out:
-	return sap;
-}
-
-/**
- *	llc_sap_close - close interface for upper layers.
- *	@sap: SAP to be closed.
- *
- *	Close interface function to upper layer. Each one who wants to
- *	close an open SAP (for example NetBEUI) should call this function.
- * 	Removes this sap from the list of saps in the station and then
- * 	frees the memory for this sap.
- */
-void llc_sap_close(struct llc_sap *sap)
-{
-	WARN_ON(!hlist_empty(&sap->sk_list.list));
-	write_lock_bh(&sap->station->sap_list.lock);
-	list_del(&sap->node);
-	write_unlock_bh(&sap->station->sap_list.lock);
-	kfree(sap);
-}
-
-EXPORT_SYMBOL(llc_sap_open);
-EXPORT_SYMBOL(llc_sap_close);
 EXPORT_SYMBOL(llc_save_primitive);
 EXPORT_SYMBOL(llc_build_and_send_test_pkt);
 EXPORT_SYMBOL(llc_build_and_send_ui_pkt);