net/llc/*.c

Forward port of LLC from 2.4 to 2.5. This is the forward port of the LLC stack
released by Procom Inc. for Linux 2.0.30, I have heavily modified it to make
it similar to other Linux network stacks, using of struct sk_buff to represent
in-transit packets and doing massive code cleanups.

Jay Schullist contributed support for BSD Sockets, as the original code had
only a simple in kernel API for use by upper layer protocols, such as the
NetBEUI stack also provided by Procom for 2.0.30.

This code is basically what I had previously submitted to Alan Cox for his
2.4-ac series and that is even shipped in source form, in the Red Hat 7.3
kernel package, plus cleanups wrt standard syntax for labeled elements and
further use of this C construct to make the code more resilient to editing
mistakes, using the compiler to further check the source code.

TODO:

Make it completely SMP safe, as the reports of successful usage up to now and
the testing is done on UP.

Completely remove the old LLC code in the kernel, that is still there for things
like Appletalk, IPX, etc to use, also check that all these protocols work
correctly with this new LLC stack.

This code is already being used in the linux-sna project and Jay Schullist
has been developing support for things like DLSw and other protocols that works
on top of 802.2.

I'll be releasing patches with the NetBEUI stack and updated samba-2.0.6 patches
for use with NetBEUI and this LLC stack in the future. But the NetBEUI code
is available already in my kernel.org ftp area at:

ftp://ftp.kernel.org/pub/linux/kernel/people/acme.

Please report problems to me or the linux-sna mailing list, instructions on how
to subscribe are available at http://www.linux-sna.org website.

MAINTAINERS

@@ -944,6 +944,11 @@ W:	http://www.linuxppc.org/
 L:	linuxppc-dev@lists.linuxppc.org
 S:	Maintained
 
+LLC (802.2)
+P:	Arnaldo Carvalho de Melo
+M:	acme@conectiva.com.br
+S:	Maintained
+
 LINUX FOR 64BIT POWERPC
 P:	David Engebretsen
 M:	engebret@us.ibm.com

include/linux/brlock.h

@@ -28,13 +28,15 @@
  * load-locked/store-conditional cpus (ALPHA/MIPS/PPC) and
  * compare-and-swap cpus (Sparc64).  So we control which
  * implementation to use with a __BRLOCK_USE_ATOMICS define. -DaveM
+ *
+ * Added BR_LLC_LOCK for use in net/core/ext8022.c -acme
  */
 
 /* Register bigreader lock indices here. */
 enum brlock_indices {
 	BR_GLOBALIRQ_LOCK,
 	BR_NETPROTO_LOCK,
-
+	BR_LLC_LOCK,
 	__BR_END
 };
 

include/linux/llc.h

+#ifndef __LINUX_LLC_H
+#define __LINUX_LLC_H
+/*
+ * IEEE 802.2 User Interface SAPs for Linux, data structures and indicators.
+ *
+ * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
+ *
+ * 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.
+ */
+#define __LLC_SOCK_SIZE__ 28	/* sizeof(sockaddr_llc), word align. */
+struct sockaddr_llc {
+	sa_family_t     sllc_family;	/* AF_LLC */
+	sa_family_t	sllc_arphrd;	/* ARPHRD_ETHER */
+	unsigned char   sllc_test;
+	unsigned char   sllc_xid;
+	unsigned char	sllc_ua;	/* UA data, only for SOCK_STREAM. */
+	unsigned char   sllc_dsap;
+	unsigned char   sllc_ssap;
+	unsigned char   sllc_dmac[IFHWADDRLEN];
+	unsigned char   sllc_smac[IFHWADDRLEN];
+	unsigned char   sllc_mmac[IFHWADDRLEN];
+	unsigned char   __pad[__LLC_SOCK_SIZE__ - sizeof(sa_family_t) * 2 -
+			      sizeof(unsigned char) * 5 - IFHWADDRLEN * 3];
+};
+
+/* sockopt definitions. */
+enum llc_sockopts {
+	LLC_OPT_UNKNOWN = 0,
+	LLC_OPT_RETRY,		/* max retrans attempts. */
+	LLC_OPT_SIZE,		/* max PDU size (octets). */
+	LLC_OPT_ACK_TMR_EXP,	/* ack expire time (secs). */
+	LLC_OPT_P_TMR_EXP,	/* pf cycle expire time (secs). */
+	LLC_OPT_REJ_TMR_EXP,	/* rej sent expire time (secs). */
+	LLC_OPT_BUSY_TMR_EXP,	/* busy state expire time (secs). */
+	LLC_OPT_TX_WIN,		/* tx window size. */
+	LLC_OPT_RX_WIN,		/* rx window size. */
+	LLC_OPT_MAX
+};
+
+#define LLC_OPT_MAX_RETRY	 100
+#define LLC_OPT_MAX_SIZE	4196
+#define LLC_OPT_MAX_WIN		 127
+#define LLC_OPT_MAX_ACK_TMR_EXP	  60
+#define LLC_OPT_MAX_P_TMR_EXP	  60
+#define LLC_OPT_MAX_REJ_TMR_EXP	  60
+#define LLC_OPT_MAX_BUSY_TMR_EXP  60
+
+/* LLC SAP types. */
+#define LLC_SAP_NULL	0x00		/* NULL SAP. 			*/
+#define LLC_SAP_LLC	0x02		/* LLC Sublayer Managment. 	*/
+#define LLC_SAP_SNA	0x04		/* SNA Path Control. 		*/
+#define LLC_SAP_PNM	0x0E		/* Proway Network Managment.	*/	
+#define LLC_SAP_IP	0x06		/* TCP/IP. 			*/
+#define LLC_SAP_BSPAN	0x42		/* Bridge Spanning Tree Proto	*/
+#define LLC_SAP_MMS	0x4E		/* Manufacturing Message Srv.	*/
+#define LLC_SAP_8208	0x7E		/* ISO 8208			*/
+#define LLC_SAP_3COM	0x80		/* 3COM. 			*/
+#define LLC_SAP_PRO	0x8E		/* Proway Active Station List	*/
+#define LLC_SAP_SNAP	0xAA		/* SNAP. 			*/
+#define LLC_SAP_BANYAN	0xBC		/* Banyan. 			*/
+#define LLC_SAP_IPX	0xE0		/* IPX/SPX. 			*/
+#define LLC_SAP_NETBEUI	0xF0		/* NetBEUI. 			*/
+#define LLC_SAP_LANMGR	0xF4		/* LanManager. 			*/
+#define LLC_SAP_IMPL	0xF8		/* IMPL				*/
+#define LLC_SAP_DISC	0xFC		/* Discovery			*/
+#define LLC_SAP_OSI	0xFE		/* OSI Network Layers. 		*/
+#define LLC_SAP_LAR	0xDC		/* LAN Address Resolution 	*/
+#define LLC_SAP_RM	0xD4		/* Resource Management 		*/
+#define LLC_SAP_GLOBAL	0xFF		/* Global SAP. 			*/
+
+#ifdef __KERNEL__
+#define LLC_SAP_DYN_START	0xC0
+#define LLC_SAP_DYN_STOP	0xDE
+#define LLC_SAP_DYN_TRIES	4
+
+struct sock;
+
+struct llc_ui_opt {
+	u16		     link;	/* network layer link number */
+	struct llc_sap	    *sap;	/* pointer to parent SAP */
+	struct sock	    *core_sk;
+	struct net_device   *dev;	/* device to send to remote */
+	struct sockaddr_llc  addr;	/* address sock is bound to */
+};
+
+#define llc_ui_sk(__sk) ((struct llc_ui_opt *)(__sk)->protinfo)
+#define llc_ui_skb_cb(__skb) ((struct sockaddr_llc *)&((__skb)->cb[0]))
+
+#ifdef CONFIG_LLC_UI
+extern int llc_ui_init(void);
+extern void llc_ui_exit(void);
+#else
+#define llc_ui_init()
+#define llc_ui_exit()
+#endif
+#endif /* __KERNEL__ */
+#endif /* __LINUX_LLC_H */

include/net/datalink.h

@@ -5,7 +5,16 @@ struct datalink_proto {
         unsigned short  type_len;
         unsigned char   type[8];
         const char      *string_name;
+
+        union {
+                struct llc_pinfo *llc;
+        } ll_pinfo;
+
+	struct llc_sc_info *llc_sc;
+	struct sock *sock;
+
         unsigned short  header_length;
+
         int     (*rcvfunc)(struct sk_buff *, struct net_device *,
                                 struct packet_type *);
         void    (*datalink_header)(struct datalink_proto *, struct sk_buff *,

include/net/llc_actn.h

+#ifndef LLC_ACTN_H
+#define LLC_ACTN_H
+/*
+ * Copyright (c) 1997 by Procom Technology,Inc.
+ * 		 2001 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.
+ */
+/* Station component state transition actions */
+#define LLC_STATION_AC_START_ACK_TMR		1
+#define LLC_STATION_AC_SET_RETRY_CNT_0		2
+#define LLC_STATION_AC_INC_RETRY_CNT_BY_1	3
+#define LLC_STATION_AC_SET_XID_R_CNT_0		4
+#define LLC_STATION_AC_INC_XID_R_CNT_BY_1	5
+#define LLC_STATION_AC_SEND_NULL_DSAP_XID_C	6
+#define LLC_STATION_AC_SEND_XID_R		7
+#define LLC_STATION_AC_SEND_TEST_R		8
+#define LLC_STATION_AC_REPORT_STATUS		9
+
+/* All station state event action functions look like this */
+typedef int (*llc_station_action_t)(struct llc_station *station,
+				    struct llc_station_state_ev *ev);
+extern int llc_station_ac_start_ack_timer(struct llc_station *station,
+					  struct llc_station_state_ev *ev);
+extern int llc_station_ac_set_retry_cnt_0(struct llc_station *station,
+					  struct llc_station_state_ev *ev);
+extern int llc_station_ac_inc_retry_cnt_by_1(struct llc_station *station,
+					     struct llc_station_state_ev *ev);
+extern int llc_station_ac_set_xid_r_cnt_0(struct llc_station *station,
+					  struct llc_station_state_ev *ev);
+extern int llc_station_ac_inc_xid_r_cnt_by_1(struct llc_station *station,
+					     struct llc_station_state_ev *ev);
+extern int llc_station_ac_send_null_dsap_xid_c(struct llc_station *station,
+					       struct llc_station_state_ev *ev);
+extern int llc_station_ac_send_xid_r(struct llc_station *station,
+				     struct llc_station_state_ev *ev);
+extern int llc_station_ac_send_test_r(struct llc_station *station,
+				      struct llc_station_state_ev *ev);
+extern int llc_station_ac_report_status(struct llc_station *station,
+					struct llc_station_state_ev *ev);
+extern int llc_station_ac_report_status(struct llc_station *station,
+					struct llc_station_state_ev *ev);
+#endif /* LLC_ACTN_H */

include/net/llc_c_st.h

+#ifndef LLC_C_ST_H
+#define LLC_C_ST_H
+/*
+ * Copyright (c) 1997 by Procom Technology,Inc.
+ *		2001 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.
+ */
+/* Connection component state management */
+/* connection states */
+#define LLC_CONN_OUT_OF_SVC		 0	/* prior to allocation */
+ 
+#define LLC_CONN_STATE_ADM		 1	/* disc, initial state */
+#define LLC_CONN_STATE_SETUP		 2	/* disconnected state */
+#define LLC_CONN_STATE_NORMAL		 3	/* connected state */
+#define LLC_CONN_STATE_BUSY		 4	/* connected state */
+#define LLC_CONN_STATE_REJ		 5	/* connected state */
+#define LLC_CONN_STATE_AWAIT		 6	/* connected state */
+#define LLC_CONN_STATE_AWAIT_BUSY	 7	/* connected state */
+#define LLC_CONN_STATE_AWAIT_REJ	 8	/* connected state */
+#define LLC_CONN_STATE_D_CONN		 9	/* disconnected state */
+#define LLC_CONN_STATE_RESET		10	/* disconnected state */
+#define LLC_CONN_STATE_ERROR		11	/* disconnected state */
+#define LLC_CONN_STATE_TEMP		12	/* disconnected state */
+
+#define NBR_CONN_STATES			12	/* size of state table */
+#define NO_STATE_CHANGE			100
+
+/* Connection state table structure */
+struct llc_conn_state_trans {
+   llc_conn_ev_t       ev;
+   u8		       next_state;
+   llc_conn_ev_qfyr_t *ev_qualifiers;
+   llc_conn_action_t  *ev_actions;
+};
+
+struct llc_conn_state {
+   u8 current_state;
+   struct llc_conn_state_trans **transitions;
+};
+
+extern struct llc_conn_state llc_conn_state_table[];
+#endif /* LLC_C_ST_H */

include/net/llc_conn.h

+#ifndef LLC_CONN_H
+#define LLC_CONN_H
+/*
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ * 		 2001 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/timer.h>
+#include <net/llc_if.h>
+
+#undef DEBUG_LLC_CONN_ALLOC
+
+struct llc_timer {
+	struct timer_list timer;
+	u8		  running;	/* timer is running or no */
+	u16		  expire;	/* timer expire time */
+};
+
+struct llc_opt {
+	struct list_head    node;		/* entry in sap->sk_list.list */
+	struct sock	    *sk;		/* sock that has this llc_opt */
+	void		    *handler;		/* for upper layers usage */
+	u8		    state;		/* state of connection */
+	struct llc_sap	    *sap;		/* pointer to parent SAP */
+	struct llc_addr	    laddr;		/* lsap/mac pair */
+	struct llc_addr	    daddr;		/* dsap/mac pair */
+	struct net_device   *dev;		/* device to send to remote */
+	u8		    retry_count;	/* number of retries */
+	u8		    ack_must_be_send;
+	u8		    first_pdu_Ns;
+	u8		    npta;
+	struct llc_timer    ack_timer;
+	struct llc_timer    pf_cycle_timer;
+	struct llc_timer    rej_sent_timer;
+	struct llc_timer    busy_state_timer;	/* ind busy clr at remote LLC */
+	u8		    vS;			/* seq# next in-seq I-PDU tx'd*/
+	u8		    vR;			/* seq# next in-seq I-PDU rx'd*/
+	u32		    n2;			/* max nbr re-tx's for timeout*/
+	u32		    n1;			/* max nbr octets in I PDU */
+	u8		    k;			/* tx window size; max = 127 */
+	u8		    rw;			/* rx window size; max = 127 */
+	u8		    p_flag;		/* state flags */
+	u8		    f_flag;
+	u8		    s_flag;
+	u8		    data_flag;
+	u8		    remote_busy_flag;
+	u8		    cause_flag;
+	struct sk_buff_head pdu_unack_q;	/* PUDs sent/waiting ack */
+	u16		    link;		/* network layer link number */
+	u8		    X;			/* a temporary variable */
+	u8		    ack_pf;		/* this flag indicates what is
+						   the P-bit of acknowledge */
+	u8		    failed_data_req; /* recognize that already exist a
+						failed llc_data_req_handler
+						(tx_buffer_full or unacceptable
+						state */
+	u8		    dec_step;
+	u8		    inc_cntr;
+	u8		    dec_cntr;
+	u8		    connect_step;
+	u8		    last_nr;	   /* NR of last pdu recieved */
+	u32		    rx_pdu_hdr;	   /* used for saving header of last pdu
+					      received and caused sending FRMR.
+					      Used for resending FRMR */
+#ifdef DEBUG_LLC_CONN_ALLOC
+	char *f_alloc,	/* function that allocated this connection */
+	     *f_free;	/* function that freed this connection */
+	int l_alloc,	/* line that allocated this connection */
+	    l_free;	/* line that freed this connection */
+#endif
+};
+
+#define llc_sk(__sk) ((struct llc_opt *)(__sk)->protinfo)
+
+struct llc_conn_state_ev;
+
+extern struct sock *__llc_sock_alloc(void);
+extern void __llc_sock_free(struct sock *sk, u8 free);
+
+#ifdef DEBUG_LLC_CONN_ALLOC
+#define dump_stack() printk(KERN_INFO "call trace: %p, %p, %p\n",	\
+				__builtin_return_address(0),		\
+				__builtin_return_address(1),		\
+				__builtin_return_address(2));
+#define llc_sock_alloc()	({					\
+	struct sock *__sk = __llc_sock_alloc();				\
+	if (__sk) {							\
+		llc_sk(__sk)->f_alloc = __FUNCTION__;			\
+		llc_sk(__sk)->l_alloc = __LINE__;			\
+	}								\
+	__sk;})
+#define __llc_sock_assert(__sk)						\
+	if (llc_sk(__sk)->f_free) {					\
+		printk(KERN_ERR						\
+		       "%p conn (alloc'd @ %s(%d)) "			\
+		       "already freed @ %s(%d) "			\
+		       "being used again @ %s(%d)\n",			\
+		       llc_sk(__sk),					\
+		       llc_sk(__sk)->f_alloc, llc_sk(__sk)->l_alloc,	\
+		       llc_sk(__sk)->f_free, llc_sk(__sk)->l_free,	\
+		       __FUNCTION__, __LINE__);				\
+		dump_stack();
+#define llc_sock_free(__sk)						\
+{									\
+	__llc_sock_assert(__sk)						\
+	} else {							\
+		__llc_sock_free(__sk, 0);				\
+		llc_sk(__sk)->f_free = __FUNCTION__;			\
+		llc_sk(__sk)->l_free = __LINE__;			\
+	}								\
+}
+#define llc_sock_assert(__sk)						\
+{									\
+	__llc_sock_assert(__sk);					\
+	return; }							\
+}
+#define llc_sock_assert_ret(__sk, __ret)				\
+{									\
+	__llc_sock_assert(__sk);					\
+	return __ret; }							\
+}
+#else /* DEBUG_LLC_CONN_ALLOC */
+#define llc_sock_alloc() __llc_sock_alloc()
+#define llc_sock_free(__sk) __llc_sock_free(__sk, 1)
+#define llc_sock_assert(__sk)
+#define llc_sock_assert_ret(__sk)
+#endif /* DEBUG_LLC_CONN_ALLOC */
+
+extern void llc_sock_reset(struct sock *sk);
+extern int llc_sock_init(struct sock *sk);
+
+/* Access to a connection */
+extern struct llc_conn_state_ev *llc_conn_alloc_ev(struct sock *sk);
+extern int llc_conn_send_ev(struct sock *sk, struct llc_conn_state_ev *ev);
+extern void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb);
+extern void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb,
+			     struct llc_conn_state_ev *ev);
+extern void llc_conn_free_ev(struct llc_conn_state_ev *ev);
+extern void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr,
+					 u8 first_p_bit);
+extern void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr,
+					 u8 first_f_bit);
+extern int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr,
+				      u16 *how_many_unacked);
+extern struct sock *llc_find_sock(struct llc_sap *sap, struct llc_addr *daddr,
+				  struct llc_addr *laddr);
+extern u8 llc_data_accept_state(u8 state);
+extern void llc_build_offset_table(void);
+#endif /* LLC_CONN_H */

include/net/llc_evnt.h

+#ifndef LLC_EVNT_H
+#define LLC_EVNT_H
+/*
+ * Copyright (c) 1997 by Procom Technology,Inc.
+ * 		 2001 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.
+ */
+/* Station component state transition events */
+/* Types of events (possible values in 'ev->type') */
+#define LLC_STATION_EV_TYPE_SIMPLE	1
+#define LLC_STATION_EV_TYPE_CONDITION	2
+#define LLC_STATION_EV_TYPE_PRIM	3
+#define LLC_STATION_EV_TYPE_PDU		4       /* command/response PDU */
+#define LLC_STATION_EV_TYPE_ACK_TMR	5
+#define LLC_STATION_EV_TYPE_RPT_STATUS	6
+
+/* Events */
+#define LLC_STATION_EV_ENABLE_WITH_DUP_ADDR_CHECK		1
+#define LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK		2
+#define LLC_STATION_EV_ACK_TMR_EXP_LT_RETRY_CNT_MAX_RETRY	3
+#define LLC_STATION_EV_ACK_TMR_EXP_EQ_RETRY_CNT_MAX_RETRY	4
+#define LLC_STATION_EV_RX_NULL_DSAP_XID_C			5
+#define LLC_STATION_EV_RX_NULL_DSAP_0_XID_R_XID_R_CNT_EQ	6
+#define LLC_STATION_EV_RX_NULL_DSAP_1_XID_R_XID_R_CNT_EQ	7
+#define LLC_STATION_EV_RX_NULL_DSAP_TEST_C			8
+#define LLC_STATION_EV_DISABLE_REQ				9
+
+/* Interfaces for various types of supported events */
+struct llc_stat_ev_simple_if {
+	u8 ev;
+};
+
+struct llc_stat_ev_prim_if {
+	u8 prim; /* connect, disconnect, reset, ... */
+	u8 type; /* request, indicate, response, confirm */
+};
+
+struct llc_stat_ev_pdu_if {
+	u8 reason;
+	struct sk_buff *skb;
+};
+
+struct llc_stat_ev_tmr_if {
+	void *timer_specific;
+};
+
+struct llc_stat_ev_rpt_sts_if {
+	u8 status;
+};
+
+union llc_stat_ev_if {
+	struct llc_stat_ev_simple_if  a;	/* 'a' for simple, easy ... */
+	struct llc_stat_ev_prim_if    prim;
+	struct llc_stat_ev_pdu_if     pdu;
+	struct llc_stat_ev_tmr_if   tmr;
+	struct llc_stat_ev_rpt_sts_if rsts;	/* report status */
+};
+
+struct llc_station_state_ev {
+	u8			type;
+	union llc_stat_ev_if data;
+	struct list_head	node; /* node in station->ev_q.list */
+};
+
+typedef int (*llc_station_ev_t)(struct llc_station *station,
+				struct llc_station_state_ev *ev);
+
+extern int llc_stat_ev_enable_with_dup_addr_check(struct llc_station *station,
+					       struct llc_station_state_ev *ev);
+extern int llc_stat_ev_enable_without_dup_addr_check(struct llc_station *station,
+					       struct llc_station_state_ev *ev);
+extern int llc_stat_ev_ack_tmr_exp_lt_retry_cnt_max_retry(struct llc_station *
+									station,
+					       struct llc_station_state_ev *ev);
+extern int llc_stat_ev_ack_tmr_exp_eq_retry_cnt_max_retry(struct llc_station *station,
+					       struct llc_station_state_ev *ev);
+extern int llc_stat_ev_rx_null_dsap_xid_c(struct llc_station *station,
+					  struct llc_station_state_ev *ev);
+extern int llc_stat_ev_rx_null_dsap_0_xid_r_xid_r_cnt_eq(struct llc_station *station,
+					       struct llc_station_state_ev *ev);
+extern int llc_stat_ev_rx_null_dsap_1_xid_r_xid_r_cnt_eq(struct llc_station *station,
+					       struct llc_station_state_ev *ev);
+extern int llc_stat_ev_rx_null_dsap_test_c(struct llc_station *station,
+					   struct llc_station_state_ev *ev);
+extern int llc_stat_ev_disable_req(struct llc_station *station,
+				       struct llc_station_state_ev *ev);
+#endif /* LLC_EVNT_H */

include/net/llc_if.h

+#ifndef LLC_IF_H
+#define LLC_IF_H
+/*
+ * Copyright (c) 1997 by Procom Technology,Inc.
+ * 		 2001 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.
+ */
+/* Defines LLC interface to network layer */
+/* Available primitives */
+#include <linux/if.h>
+
+#define LLC_DATAUNIT_PRIM	0
+#define LLC_CONN_PRIM		1
+#define LLC_DATA_PRIM		2
+#define LLC_DISC_PRIM		3
+#define LLC_RESET_PRIM		4
+#define LLC_FLOWCONTROL_PRIM	5
+#define LLC_DISABLE_PRIM	6
+#define LLC_XID_PRIM		7
+#define LLC_TEST_PRIM		8
+#define LLC_SAP_ACTIVATION      9
+#define LLC_SAP_DEACTIVATION   10
+
+#define LLC_NBR_PRIMITIVES     11
+
+#define LLC_IND			1
+#define LLC_CONFIRM		2
+
+/* Primitive type */
+#define LLC_PRIM_TYPE_REQ	1
+#define LLC_PRIM_TYPE_IND	2
+#define LLC_PRIM_TYPE_RESP	3
+#define LLC_PRIM_TYPE_CONFIRM	4
+
+/* Reset reasons, remote entity or local LLC */
+#define LLC_RESET_REASON_REMOTE	1
+#define LLC_RESET_REASON_LOCAL	2
+
+/* Disconnect reasons */
+#define LLC_DISC_REASON_RX_DM_RSP_PDU	0
+#define LLC_DISC_REASON_RX_DISC_CMD_PDU	1
+#define LLC_DISC_REASON_ACK_TMR_EXP	2
+
+/* Confirm reasons */
+#define LLC_STATUS_CONN		0 /* connect confirm & reset confirm */
+#define LLC_STATUS_DISC		1 /* connect confirm & reset confirm */
+#define LLC_STATUS_FAILED	2 /* connect confirm & reset confirm */
+#define LLC_STATUS_IMPOSSIBLE	3 /* connect confirm */
+#define LLC_STATUS_RECEIVED	4 /* data conn */
+#define LLC_STATUS_REMOTE_BUSY	5 /* data conn */
+#define LLC_STATUS_REFUSE	6 /* data conn */
+#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];
+};
+
+/* Primitive-specific data */
+struct llc_prim_conn {
+	struct llc_addr	   saddr;	/* used by request only */
+	struct llc_addr	   daddr;	/* used by request only */
+	u8		   status;	/* reason for failure */
+	u8		   pri;		/* service_class */
+	struct net_device *dev;
+	struct sock	  *sk;		/* returned from REQUEST */
+	void		  *handler;	/* upper layer use,
+					   stored in llc_opt->handler */
+	u16		   link;
+	struct sk_buff	  *skb;		/* received SABME  */
+};
+
+struct llc_prim_disc {
+	struct sock *sk;
+	u16	     link;
+	u8	     reason;		/* not used by request */
+};
+
+struct llc_prim_reset {
+	struct sock *sk;
+	u16	     link;
+	u8	     reason;		/* used only by indicate */
+};
+
+struct llc_prim_flow_ctrl {
+	struct sock *sk;
+	u16	     link;
+	u32	     amount;
+};
+
+struct llc_prim_data {
+	struct sock    *sk;
+	u16		link;
+	u8		pri;
+	struct sk_buff *skb;		/* pointer to frame */
+	u8	 	status;		/* reason */
+};
+
+ /* Sending data in conection-less mode */
+struct llc_prim_unit_data {
+	struct llc_addr	saddr;
+	struct llc_addr	daddr;
+	u8		pri;
+	struct sk_buff *skb;		/* pointer to frame */
+	u8		lfb;		/* largest frame bit (TR) */
+};
+
+struct llc_prim_xid {
+	struct llc_addr saddr;
+	struct llc_addr daddr;
+	u8		pri;
+	struct sk_buff *skb;
+};
+
+struct llc_prim_test {
+	struct llc_addr	saddr;
+	struct llc_addr	daddr;
+	u8		pri;
+	struct sk_buff *skb;		/* pointer to frame */
+};
+
+union llc_u_prim_data {
+	struct llc_prim_conn	  conn;
+	struct llc_prim_disc	  disc;
+	struct llc_prim_reset	  res;
+	struct llc_prim_flow_ctrl fc;
+	struct llc_prim_data	  data;		/* data */
+	struct llc_prim_unit_data udata;	/* unit data */
+	struct llc_prim_xid	  xid;
+	struct llc_prim_test	  test;
+};
+
+struct llc_sap;
+
+/* Information block passed with all called primitives */
+struct llc_prim_if_block {
+	struct llc_sap	      *sap;
+	u8		       prim;
+	union llc_u_prim_data *data;
+};
+typedef int (*llc_prim_call_t)(struct llc_prim_if_block *prim_if);
+
+extern struct llc_sap *llc_sap_open(llc_prim_call_t network_indicate,
+				    llc_prim_call_t network_confirm, u8 lsap);
+extern void llc_sap_close(struct llc_sap *sap);
+#endif /* LLC_IF_H */

include/net/llc_mac.h

+#ifndef LLC_MAC_H
+#define LLC_MAC_H
+/*
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ * 		 2001 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.
+ */
+/* Defines MAC-layer interface to LLC layer */
+extern int mac_send_pdu(struct sk_buff *skb);
+extern int mac_indicate(struct sk_buff *skb, struct net_device *dev,
+			struct packet_type *pt);
+extern struct net_device *mac_dev_peer(struct net_device *current_dev,
+				       int type, u8 *mac);
+extern int llc_pdu_router(struct llc_sap *sap, struct sock *sk,
+			  struct sk_buff *skb, u8 type);
+extern u16 lan_hdrs_init(struct sk_buff *skb, u8 *sa, u8 *da);
+#endif /* LLC_MAC_H */

include/net/llc_main.h

+#ifndef LLC_MAIN_H
+#define LLC_MAIN_H
+/*
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ * 		 2001 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.
+ */
+#define LLC_EVENT		 1
+#define LLC_PACKET		 2
+#define LLC_TYPE_1		 1
+#define LLC_TYPE_2		 2
+#define LLC_P_TIME		 2
+#define LLC_ACK_TIME		 3
+#define LLC_REJ_TIME		 3
+#define LLC_BUSY_TIME		 3
+#define LLC_SENDACK_TIME	50
+#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 */
+
+/* LLC Layer global default parameters */
+
+#define LLC_GLOBAL_DEFAULT_MAX_NBR_SAPS		4
+#define LLC_GLOBAL_DEFAULT_MAX_NBR_CONNS	64
+
+extern struct llc_prim_if_block llc_ind_prim, llc_cfm_prim;
+
+/* LLC station component (SAP and connection resource manager) */
+/* Station component; one per adapter */
+struct llc_station {
+	u8     state;			/* state of station */
+	u8     xid_r_count;		/* XID response PDU counter */
+	struct timer_list ack_timer;
+	u8     ack_tmr_running;		/* 1 or 0 */
+	u8     retry_count;
+	u8     maximum_retry;
+	u8     mac_sa[6];		/* MAC source address */
+	struct {
+		spinlock_t	 lock;
+		struct list_head list;
+	} sap_list;			/* list of related SAPs */
+	struct {
+		spinlock_t	 lock;
+		struct list_head list;
+	} ev_q;				/* events entering state mach. */
+	struct sk_buff_head mac_pdu_q;	/* PDUs ready to send to MAC */
+};
+struct llc_station_state_ev;
+
+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 struct llc_station *llc_station_get(void);
+extern struct llc_station_state_ev *
+			     llc_station_alloc_ev(struct llc_station *station);
+extern void llc_station_send_ev(struct llc_station *station,
+				struct llc_station_state_ev *ev);
+extern void llc_station_send_pdu(struct llc_station *station,
+				 struct sk_buff *skb);
+extern struct sk_buff *llc_alloc_frame(void);
+#endif /* LLC_MAIN_H */

include/net/llc_s_ac.h

+#ifndef LLC_S_AC_H
+#define LLC_S_AC_H
+/*
+ * Copyright (c) 1997 by Procom Technology,Inc.
+ * 		 2001 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.
+ */
+/* SAP component actions */
+#define SAP_ACT_UNITDATA_IND	1
+#define SAP_ACT_SEND_UI		2
+#define SAP_ACT_SEND_XID_C	3
+#define SAP_ACT_SEND_XID_R	4
+#define SAP_ACT_SEND_TEST_C	5
+#define SAP_ACT_SEND_TEST_R	6
+#define SAP_ACT_REPORT_STATUS	7
+#define SAP_ACT_XID_IND		8
+#define SAP_ACT_TEST_IND	9
+
+/* All action functions must look like this */
+typedef int (*llc_sap_action_t)(struct llc_sap *sap,
+				struct llc_sap_state_ev *ev);
+
+extern int llc_sap_action_unitdata_ind(struct llc_sap *sap,
+				       struct llc_sap_state_ev *ev);
+extern int llc_sap_action_send_ui(struct llc_sap *sap,
+				  struct llc_sap_state_ev *ev);
+extern int llc_sap_action_send_xid_c(struct llc_sap *sap,
+				     struct llc_sap_state_ev *ev);
+extern int llc_sap_action_send_xid_r(struct llc_sap *sap,
+				     struct llc_sap_state_ev *ev);
+extern int llc_sap_action_send_test_c(struct llc_sap *sap,
+				      struct llc_sap_state_ev *ev);
+extern int llc_sap_action_send_test_r(struct llc_sap *sap,
+				      struct llc_sap_state_ev *ev);
+extern int llc_sap_action_report_status(struct llc_sap *sap,
+					struct llc_sap_state_ev *ev);
+extern int llc_sap_action_xid_ind(struct llc_sap *sap,
+				  struct llc_sap_state_ev *ev);
+extern int llc_sap_action_test_ind(struct llc_sap *sap,
+				   struct llc_sap_state_ev *ev);
+#endif /* LLC_S_AC_H */

include/net/llc_s_ev.h

+#ifndef LLC_S_EV_H
+#define LLC_S_EV_H
+/*
+ * Copyright (c) 1997 by Procom Technology,Inc.
+ * 		 2001 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.
+ */
+/* Defines SAP component events */
+/* Types of events (possible values in 'ev->type') */
+#define LLC_SAP_EV_TYPE_SIMPLE		1
+#define LLC_SAP_EV_TYPE_CONDITION	2
+#define LLC_SAP_EV_TYPE_PRIM		3
+#define LLC_SAP_EV_TYPE_PDU		4   /* command/response PDU */
+#define LLC_SAP_EV_TYPE_ACK_TMR		5
+#define LLC_SAP_EV_TYPE_RPT_STATUS	6
+
+#define LLC_SAP_EV_ACTIVATION_REQ	 1
+#define LLC_SAP_EV_RX_UI		 2
+#define LLC_SAP_EV_UNITDATA_REQ		 3
+#define LLC_SAP_EV_XID_REQ		 4
+#define LLC_SAP_EV_RX_XID_C		 5
+#define LLC_SAP_EV_RX_XID_R		 6
+#define LLC_SAP_EV_TEST_REQ		 7
+#define LLC_SAP_EV_RX_TEST_C		 8
+#define LLC_SAP_EV_RX_TEST_R		 9
+#define LLC_SAP_EV_DEACTIVATION_REQ	10
+
+/* Interfaces for various types of supported events */
+struct llc_sap_ev_simple_if {
+	u8 ev;
+};
+
+struct llc_prim_if_block;
+
+struct llc_sap_ev_prim_if {
+	u8			  prim; /* connect, disconnect, reset, ... */
+	u8			  type; /* request, indicate, response, conf */
+	struct llc_prim_if_block *data;
+};
+
+struct llc_sap_ev_pdu_if {
+	u8		   ev;
+	u8		   reason;
+	struct sk_buff *skb;
+};
+
+struct llc_sap_ev_tmr_if {
+	void *timer_specific;
+};
+
+struct llc_sap_ev_rpt_sts_if {
+	u8 status;
+};
+
+union llc_sap_ev_if {
+	struct llc_sap_ev_simple_if	a;	/* 'a' for simple, easy ... */
+	struct llc_sap_ev_prim_if	prim;
+	struct llc_sap_ev_pdu_if	pdu;
+	struct llc_sap_ev_tmr_if	tmr;
+	struct llc_sap_ev_rpt_sts_if	rsts;	/* report status */
+};
+
+struct llc_prim_if_block;
+
+struct llc_sap_state_ev {
+	u8			  type;
+	u8			  ind_cfm_flag;
+	struct llc_prim_if_block *prim;
+	union llc_sap_ev_if	  data;
+};
+
+struct llc_sap;
+
+typedef int (*llc_sap_ev_t)(struct llc_sap *sap, struct llc_sap_state_ev *ev);
+
+extern int llc_sap_ev_activation_req(struct llc_sap *sap,
+				     struct llc_sap_state_ev *ev);
+extern int llc_sap_ev_rx_ui(struct llc_sap *sap, struct llc_sap_state_ev *ev);
+extern int llc_sap_ev_unitdata_req(struct llc_sap *sap,
+				   struct llc_sap_state_ev *ev);
+extern int llc_sap_ev_xid_req(struct llc_sap *sap,
+			      struct llc_sap_state_ev *ev);
+extern int llc_sap_ev_rx_xid_c(struct llc_sap *sap,
+			       struct llc_sap_state_ev *ev);
+extern int llc_sap_ev_rx_xid_r(struct llc_sap *sap,
+			       struct llc_sap_state_ev *ev);
+extern int llc_sap_ev_test_req(struct llc_sap *sap,
+			       struct llc_sap_state_ev *ev);
+extern int llc_sap_ev_rx_test_c(struct llc_sap *sap,
+				struct llc_sap_state_ev *ev);
+extern int llc_sap_ev_rx_test_r(struct llc_sap *sap,
+				struct llc_sap_state_ev *ev);
+extern int llc_sap_ev_deactivation_req(struct llc_sap *sap,
+				       struct llc_sap_state_ev *ev);
+#endif /* LLC_S_EV_H */

include/net/llc_s_st.h

+#ifndef LLC_S_ST_H
+#define LLC_S_ST_H
+/*
+ * Copyright (c) 1997 by Procom Technology,Inc.
+ * 		 2001 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.
+ */
+/* Defines SAP component states */
+
+#define LLC_SAP_STATE_INACTIVE	1
+#define LLC_SAP_STATE_ACTIVE	2
+#define LLC_NBR_SAP_STATES	2       /* size of state table */
+/* structures and types */
+/* SAP state table structure */
+struct llc_sap_state_trans {
+	llc_sap_ev_t	  ev;
+	u8		  next_state;
+	llc_sap_action_t *ev_actions;
+};
+
+struct llc_sap_state {
+    u8				 curr_state;
+    struct llc_sap_state_trans **transitions;
+};
+
+/* only access to SAP state table */
+extern struct llc_sap_state llc_sap_state_table[LLC_NBR_SAP_STATES];
+#endif /* LLC_S_ST_H */

include/net/llc_sap.h

+#ifndef LLC_SAP_H
+#define LLC_SAP_H
+/*
+ * Copyright (c) 1997 by Procom Technology,Inc.
+ * 		 2001 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/skbuff.h>
+/* Defines the SAP component */
+struct llc_sap {
+	u8		    state;
+	struct llc_station *parent_station;
+	u8		    p_bit;		/* only lowest-order bit used */
+	u8		    f_bit;		/* only lowest-order bit used */
+	llc_prim_call_t	    req;		/* provided by LLC layer */
+	llc_prim_call_t	    resp;		/* provided by LLC layer */
+	llc_prim_call_t	    ind;		/* provided by network layer */
+	llc_prim_call_t	    conf;		/* provided by network layer */
+	struct llc_addr	    laddr;		/* SAP value in this 'lsap' */
+	struct list_head    node;		/* entry in station sap_list */
+	struct {
+		spinlock_t	 lock;
+		struct list_head list;
+	} sk_list; /* LLC sockets this one manages */
+	struct sk_buff_head mac_pdu_q;		/* PDUs ready to send to MAC */
+};
+struct llc_sap_state_ev;
+
+extern void llc_sap_assign_sock(struct llc_sap *sap, struct sock *sk);
+extern void llc_sap_unassign_sock(struct llc_sap *sap, struct sock *sk);
+extern void llc_sap_send_ev(struct llc_sap *sap, struct llc_sap_state_ev *ev);
+extern void llc_sap_rtn_pdu(struct llc_sap *sap, struct sk_buff *skb,
+			    struct llc_sap_state_ev *ev);
+extern void llc_sap_send_pdu(struct llc_sap *sap, struct sk_buff *skb);
+extern struct llc_sap_state_ev *llc_sap_alloc_ev(struct llc_sap *sap);
+#endif /* LLC_SAP_H */

include/net/llc_stat.h

+#ifndef LLC_STAT_H
+#define LLC_STAT_H
+/*
+ * Copyright (c) 1997 by Procom Technology,Inc.
+ * 		 2001 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.
+ */
+/* Station component state table */
+/* Station component states */
+#define LLC_STATION_STATE_DOWN		1	/* initial state */
+#define LLC_STATION_STATE_DUP_ADDR_CHK	2
+#define LLC_STATION_STATE_UP		3
+
+#define LLC_NBR_STATION_STATES		3	/* size of state table */
+
+/* Station component state table structure */
+struct llc_station_state_trans {
+	llc_station_ev_t ev;
+	u8 next_state;
+	llc_station_action_t *ev_actions;
+};
+
+struct llc_station_state {
+	u8 curr_state;
+	struct llc_station_state_trans **transitions;
+};
+
+extern struct llc_station_state llc_station_state_table[LLC_NBR_STATION_STATES];
+#endif /* LLC_STAT_H */

include/net/p8022.h

 #ifndef _NET_P8022_H
 #define _NET_P8022_H
-
-extern struct datalink_proto *register_8022_client(unsigned char type, int (*rcvfunc)(struct sk_buff *, struct net_device *, struct packet_type *));
+extern struct datalink_proto *register_8022_client(unsigned char type,
+						   int (*rcvfunc)
+						   	(struct sk_buff *,
+							 struct net_device *,
+							 struct packet_type *));
 extern void unregister_8022_client(unsigned char type);
-
 #endif

net/802/p8022.c

@@ -11,11 +11,10 @@
  *		matches. The control byte is ignored and handling of such items
  *		is up to the routine passed the frame.
  *
- *		Unlike the 802.3 datalink we have a list of 802.2 entries as there
- *		are multiple protocols to demux. The list is currently short (3 or
- *		4 entries at most). The current demux assumes this.
+ *		Unlike the 802.3 datalink we have a list of 802.2 entries as
+ *		there are multiple protocols to demux. The list is currently
+ *		short (3 or 4 entries at most). The current demux assumes this.
  */
-
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
@@ -25,8 +24,13 @@
 #include <linux/init.h>
 #include <net/p8022.h>
 
-static struct datalink_proto *p8022_list = NULL;
+extern void llc_register_sap(unsigned char sap,
+			       int (*rcvfunc)(struct sk_buff *,
+					      struct net_device *,
+					       struct packet_type *));
+extern void llc_unregister_sap(unsigned char sap);
 
+static struct datalink_proto *p8022_list;
 /*
  *	We don't handle the loopback SAP stuff, the extended
  *	802.2 command set, multicast SAP identifiers and non UI
@@ -34,80 +38,57 @@ static struct datalink_proto *p8022_list = NULL;
  *	IP and Appletalk phase 2. See the llc_* routines for
  *	support libraries if your protocol needs these.
  */
-
 static struct datalink_proto *find_8022_client(unsigned char type)
 {
-	struct datalink_proto	*proto;
-
-	for (proto = p8022_list;
-		((proto != NULL) && (*(proto->type) != type));
-		proto = proto->next)
-		;
+	struct datalink_proto *proto = p8022_list;
 
+	while (proto && *(proto->type) != type)
+		proto = proto->next;
 	return proto;
 }
 
-int p8022_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
+int p8022_rcv(struct sk_buff *skb, struct net_device *dev,
+	      struct packet_type *pt)
 {
 	struct datalink_proto *proto;
+	int rc = 0;
 
 	proto = find_8022_client(*(skb->h.raw));
-	if (proto != NULL) 
-	{
-		skb->h.raw += 3;
-		skb->nh.raw += 3;
-		skb_pull(skb,3);
-		return proto->rcvfunc(skb, dev, pt);
-	}
-
+	if (!proto) {
 		skb->sk = NULL;
 		kfree_skb(skb);
-	return 0;
+		goto out;
+	}
+	skb->h.raw += 3;
+	skb->nh.raw += 3;
+	skb_pull(skb, 3);
+	rc = proto->rcvfunc(skb, dev, pt);
+out:	return rc;
 }
 
 static void p8022_datalink_header(struct datalink_proto *dl,
 				  struct sk_buff *skb, unsigned char *dest_node)
 {
 	struct net_device *dev = skb->dev;
-	unsigned char	*rawp;
+	unsigned char *rawp = skb_push(skb, 3);
 
-	rawp = skb_push(skb,3);
 	*rawp++ = dl->type[0];
 	*rawp++ = dl->type[0];
 	*rawp	= 0x03;	/* UI */
 	dev->hard_header(skb, dev, ETH_P_802_3, dest_node, NULL, skb->len);
 }
 
-static struct packet_type p8022_packet_type =
+struct datalink_proto *register_8022_client(unsigned char type,
+					    int (*rcvfunc)(struct sk_buff *,
+						    	   struct net_device *,
+							  struct packet_type *))
 {
-	0,	/* MUTTER ntohs(ETH_P_8022),*/
-	NULL,		/* All devices */
-	p8022_rcv,
-	NULL,
-	NULL,
-};
-
-EXPORT_SYMBOL(register_8022_client);
-EXPORT_SYMBOL(unregister_8022_client);
+	struct datalink_proto *proto = NULL;
 
-static int __init p8022_init(void)
-{
-	p8022_packet_type.type=htons(ETH_P_802_2);
-	dev_add_pack(&p8022_packet_type);
-	return 0;
-}
-
-module_init(p8022_init);
-
-struct datalink_proto *register_8022_client(unsigned char type, int (*rcvfunc)(struct sk_buff *, struct net_device *, struct packet_type *))
-{
-	struct datalink_proto	*proto;
-
-	if (find_8022_client(type) != NULL)
-		return NULL;
-
-	proto = (struct datalink_proto *) kmalloc(sizeof(*proto), GFP_ATOMIC);
-	if (proto != NULL) {
+	if (find_8022_client(type))
+		goto out;
+	proto = kmalloc(sizeof(*proto), GFP_ATOMIC);
+	if (proto) {
 		proto->type[0]		= type;
 		proto->type_len		= 1;
 		proto->rcvfunc		= rcvfunc;
@@ -116,9 +97,9 @@ struct datalink_proto *register_8022_client(unsigned char type, int (*rcvfunc)(s
 		proto->string_name	= "802.2";
 		proto->next		= p8022_list;
 		p8022_list		= proto;
+		llc_register_sap(type, p8022_rcv);
 	}
-
-	return proto;
+out:	return proto;
 }
 
 void unregister_8022_client(unsigned char type)
@@ -128,17 +109,18 @@ void unregister_8022_client(unsigned char type)
 
 	save_flags(flags);
 	cli();
-
-	while ((tmp = *clients) != NULL)
-	{
+	while (*clients) {
+		tmp = *clients;
 		if (tmp->type[0] == type) {
 			*clients = tmp->next;
 			kfree(tmp);
+			llc_unregister_sap(type);
 			break;
-		} else {
-			clients = &tmp->next;
 		}
+		clients = &tmp->next;
 	}
-
 	restore_flags(flags);
 }
+
+EXPORT_SYMBOL(register_8022_client);
+EXPORT_SYMBOL(unregister_8022_client);

net/Config.in

@@ -64,11 +64,12 @@ dep_tristate '802.1d Ethernet Bridging' CONFIG_BRIDGE $CONFIG_INET
 if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
    tristate 'CCITT X.25 Packet Layer (EXPERIMENTAL)' CONFIG_X25
    tristate 'LAPB Data Link Driver (EXPERIMENTAL)' CONFIG_LAPB
-   bool '802.2 LLC (EXPERIMENTAL)' CONFIG_LLC
+   tristate 'ANSI/IEEE 802.2 Data link layer protocol' CONFIG_LLC
+   if [ "$CONFIG_LLC" != "n" ]; then
+	# When NETBEUI is added the following line will be a tristate
+	define_bool CONFIG_LLC_UI y
+   fi
    bool 'Frame Diverter (EXPERIMENTAL)' CONFIG_NET_DIVERT
-#   if [ "$CONFIG_LLC" = "y" ]; then
-#      bool '  Netbeui (EXPERIMENTAL)' CONFIG_NETBEUI
-#   fi
    if [ "$CONFIG_INET" = "y" ]; then
       tristate 'Acorn Econet/AUN protocols (EXPERIMENTAL)' CONFIG_ECONET
       if [ "$CONFIG_ECONET" != "n" ]; then

net/Makefile

@@ -7,7 +7,7 @@
 
 O_TARGET :=	network.o
 
-mod-subdirs :=	ipv4/netfilter ipv6/netfilter ipx irda bluetooth atm netlink sched
+mod-subdirs :=	ipv4/netfilter ipv6/netfilter ipx irda bluetooth atm netlink llc sched
 export-objs :=	netsyms.o
 
 subdir-y :=	core ethernet
@@ -45,7 +45,7 @@ subdir-$(CONFIG_ATM)		+= atm
 subdir-$(CONFIG_DECNET)		+= decnet
 subdir-$(CONFIG_ECONET)		+= econet
 subdir-$(CONFIG_VLAN_8021Q)	+= 8021q
-
+subdir-$(CONFIG_LLC)		+= llc
 
 obj-y	:= socket.o $(join $(subdir-y), $(patsubst %,/%.o,$(notdir $(subdir-y))))
 ifeq ($(CONFIG_NET),y)

net/core/Makefile

@@ -9,7 +9,7 @@
 
 O_TARGET := core.o
 
-export-objs := netfilter.o profile.o
+export-objs := ext8022.o netfilter.o profile.o
 
 obj-y := sock.o skbuff.o iovec.o datagram.o scm.o
 
@@ -23,6 +23,10 @@ obj-$(CONFIG_FILTER) += filter.o
 
 obj-$(CONFIG_NET) += dev.o dev_mcast.o dst.o neighbour.o rtnetlink.o utils.o
 
+ifneq ($(CONFIG_LLC),n)
+obj-y += ext8022.o
+endif
+
 obj-$(CONFIG_NETFILTER) += netfilter.o
 obj-$(CONFIG_NET_DIVERT) += dv.o
 obj-$(CONFIG_NET_PROFILE) += profile.o

net/core/ext8022.c

+/*
+ * (ext8022.c)
+ * 
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ * 		 2001 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/config.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/brlock.h>
+
+typedef int (*func_type)(struct sk_buff *skb, struct net_device *dev,
+			 struct packet_type *pt);
+static int llc_rcv(struct sk_buff *skb, struct net_device *dev,
+		   struct packet_type *);
+
+static func_type llc_sap_table[128];
+static int llc_users;
+
+static struct packet_type llc_packet_type = {
+	type:	__constant_htons(ETH_P_802_2),
+	func:	llc_rcv,
+};
+static struct packet_type llc_tr_packet_type = {
+	type:	__constant_htons(ETH_P_TR_802_2),
+	func:	llc_rcv,
+};
+
+static int llc_rcv(struct sk_buff *skb, struct net_device *dev,
+		   struct packet_type *pt)
+{
+ 	unsigned char n = (*(skb->h.raw)) >> 1;
+
+	br_read_lock(BR_LLC_LOCK);
+	if (llc_sap_table[n])
+            llc_sap_table[n](skb, dev, pt);
+        else
+            kfree_skb(skb);
+	br_read_unlock(BR_LLC_LOCK);
+        return 0;
+}
+
+void llc_register_sap(unsigned char sap, func_type rcvfunc)
+{
+	sap >>= 1;
+	br_write_lock_bh(BR_LLC_LOCK);
+	llc_sap_table[sap] = rcvfunc;            
+	if (!llc_users) {
+		dev_add_pack(&llc_packet_type);
+		dev_add_pack(&llc_tr_packet_type);
+        }
+	llc_users++;
+	br_write_unlock_bh(BR_LLC_LOCK);
+}
+
+void llc_unregister_sap(unsigned char sap)
+{
+	sap >>= 1;
+	br_write_lock_bh(BR_LLC_LOCK);
+        llc_sap_table[sap] = NULL;
+	if (!--llc_users) {
+		dev_remove_pack(&llc_packet_type);
+		dev_remove_pack(&llc_tr_packet_type);
+        } 
+	br_write_unlock_bh(BR_LLC_LOCK);
+}
+
+EXPORT_SYMBOL(llc_register_sap);
+EXPORT_SYMBOL(llc_unregister_sap);

net/llc/Makefile

+###########################################################################
+# Makefile for the Linux 802.2 LLC (fully-functional) layer.
+#
+# Note 1! Dependencies are done automagically by 'make dep', which also
+# removes any old dependencies. DON'T put your own dependencies here
+# unless it's something special (ie not a .c file).
+#
+# Note 2! The CFLAGS definition is now in the main makefile...
+#
+# Copyright (c) 1997 by Procom Technology,Inc.
+#		2001 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.
+###########################################################################
+
+O_TARGET := llc.o
+
+obj-y := llc_if.o llc_c_ev.o llc_c_ac.o llc_mac.o llc_sap.o llc_s_st.o \
+	 llc_main.o llc_s_ac.o llc_conn.o llc_c_st.o llc_stat.o llc_actn.o \
+	 llc_s_ev.o llc_evnt.o llc_pdu.o
+
+ifeq ($(CONFIG_LLC_UI),y)
+  obj-y += llc_sock.o
+endif
+
+# Objects that export symbols.
+export-objs := llc_if.o
+
+ifeq ($(CONFIG_LLC),m)
+  obj-m += $(O_TARGET)
+endif
+
+include $(TOPDIR)/Rules.make

net/llc/llc_actn.c

+/*
+ * llc_actn.c - Implementation of actions of station component of LLC
+ *
+ * Description :
+ *   Functions in this module are implementation of station component actions.
+ *   Details of actions can be found in IEEE-802.2 standard document.
+ *   All functions have one station and one event as input argument. All of
+ *   them return 0 On success and 1 otherwise.
+ *
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ * 		 2001 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/netdevice.h>
+#include <net/llc_if.h>
+#include <net/llc_main.h>
+#include <net/llc_evnt.h>
+#include <net/llc_pdu.h>
+#include <net/llc_mac.h>
+
+static void llc_station_ack_tmr_callback(unsigned long timeout_data);
+
+int llc_station_ac_start_ack_timer(struct llc_station *station,
+				   struct llc_station_state_ev *ev)
+{
+	del_timer(&station->ack_timer);
+	station->ack_timer.expires  = jiffies + LLC_ACK_TIME * HZ;
+	station->ack_timer.data     = (unsigned long)station;
+	station->ack_timer.function = llc_station_ack_tmr_callback;
+	add_timer(&station->ack_timer);
+	station->ack_tmr_running = 1;
+	return 0;
+}
+
+int llc_station_ac_set_retry_cnt_0(struct llc_station *station,
+				   struct llc_station_state_ev *ev)
+{
+	station->retry_count = 0;
+	return 0;
+}
+
+int llc_station_ac_inc_retry_cnt_by_1(struct llc_station *station,
+				      struct llc_station_state_ev *ev)
+{
+	station->retry_count++;
+	return 0;
+}
+
+int llc_station_ac_set_xid_r_cnt_0(struct llc_station *station,
+				   struct llc_station_state_ev *ev)
+{
+	station->xid_r_count = 0;
+	return 0;
+}
+
+int llc_station_ac_inc_xid_r_cnt_by_1(struct llc_station *station,
+				      struct llc_station_state_ev *ev)
+{
+	station->xid_r_count++;
+	return 0;
+}
+
+int llc_station_ac_send_null_dsap_xid_c(struct llc_station *station,
+					struct llc_station_state_ev *ev)
+{
+	int rc = 1;
+	struct sk_buff *skb = llc_alloc_frame();
+
+	if (!skb)
+		goto out;
+	rc = 0;
+	llc_pdu_header_init(skb, LLC_PDU_TYPE_U, 0, 0, LLC_PDU_CMD);
+	llc_pdu_init_as_xid_cmd(skb, LLC_XID_NULL_CLASS_2, 127);
+	lan_hdrs_init(skb, station->mac_sa, station->mac_sa);
+	llc_station_send_pdu(station, skb);
+out:
+	return rc;
+}
+
+int llc_station_ac_send_xid_r(struct llc_station *station,
+			      struct llc_station_state_ev *ev)
+{
+	u8 mac_da[ETH_ALEN], dsap;
+	int rc = 1;
+	struct sk_buff *ev_skb;
+	struct sk_buff* skb = llc_alloc_frame();
+
+	if (!skb)
+		goto out;
+	rc = 0;
+	ev_skb = ev->data.pdu.skb;
+	skb->dev = ev_skb->dev;
+	llc_pdu_decode_sa(ev_skb, mac_da);
+	llc_pdu_decode_ssap(ev_skb, &dsap);
+	llc_pdu_header_init(skb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
+	llc_pdu_init_as_xid_rsp(skb, LLC_XID_NULL_CLASS_2, 127);
+	lan_hdrs_init(skb, station->mac_sa, mac_da);
+	llc_station_send_pdu(station, skb);
+out:
+	return rc;
+}
+
+int llc_station_ac_send_test_r(struct llc_station *station,
+			       struct llc_station_state_ev *ev)
+{
+	u8 mac_da[ETH_ALEN], dsap;
+	int rc = 1;
+	struct sk_buff *ev_skb;
+	struct sk_buff *skb = llc_alloc_frame();
+
+	if (!skb)
+		goto out;
+	rc = 0;
+	ev_skb = ev->data.pdu.skb;
+	skb->dev = ev_skb->dev;
+	llc_pdu_decode_sa(ev_skb, mac_da);
+	llc_pdu_decode_ssap(ev_skb, &dsap);
+	llc_pdu_header_init(skb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
+       	llc_pdu_init_as_test_rsp(skb, ev_skb);
+	lan_hdrs_init(skb, station->mac_sa, mac_da);
+	llc_station_send_pdu(station, skb);
+out:
+	return rc;
+}
+
+int llc_station_ac_report_status(struct llc_station *station,
+				 struct llc_station_state_ev *ev)
+{
+	return 0;
+}
+
+static void llc_station_ack_tmr_callback(unsigned long timeout_data)
+{
+	struct llc_station *station = (struct llc_station *)timeout_data;
+	struct llc_station_state_ev *ev;
+
+	station->ack_tmr_running = 0;
+	ev = llc_station_alloc_ev(station);
+	if (ev) {
+		ev->type = LLC_STATION_EV_TYPE_ACK_TMR;
+		ev->data.tmr.timer_specific = NULL;
+		llc_station_send_ev(station, ev);
+	}
+}

net/llc/llc_evnt.c

+/*
+ * llc_evnt.c - LLC station component event match functions
+ * Description :
+ *   Functions in this module are implementation of station component events.
+ *   Details of events can be found in IEEE-802.2 standard document.
+ *   All functions have one station and one event as input argument. All of
+ *   them return 0 On success and 1 otherwise.
+ *
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ * 		 2001 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/socket.h>
+#include <net/sock.h>
+#include <net/llc_if.h>
+#include <net/llc_main.h>
+#include <net/llc_evnt.h>
+#include <net/llc_pdu.h>
+
+int llc_stat_ev_enable_with_dup_addr_check(struct llc_station *station,
+					   struct llc_station_state_ev *ev)
+{
+	return ev->type == LLC_STATION_EV_TYPE_SIMPLE &&
+	       ev->data.a.ev ==
+	       		      LLC_STATION_EV_ENABLE_WITH_DUP_ADDR_CHECK ? 0 : 1;
+}
+
+int llc_stat_ev_enable_without_dup_addr_check(struct llc_station *station,
+					      struct llc_station_state_ev *ev)
+{
+	return ev->type == LLC_STATION_EV_TYPE_SIMPLE &&
+	       ev->data.a.ev ==
+			LLC_STATION_EV_ENABLE_WITHOUT_DUP_ADDR_CHECK ? 0 : 1;
+}
+
+int llc_stat_ev_ack_tmr_exp_lt_retry_cnt_max_retry(struct llc_station *station,
+						struct llc_station_state_ev *ev)
+{
+	return ev->type == LLC_STATION_EV_TYPE_ACK_TMR &&
+	       station->retry_count < station->maximum_retry ? 0 : 1;
+}
+
+int llc_stat_ev_ack_tmr_exp_eq_retry_cnt_max_retry(struct llc_station *station,
+						struct llc_station_state_ev *ev)
+{
+	return ev->type == LLC_STATION_EV_TYPE_ACK_TMR &&
+		station->retry_count == station->maximum_retry ? 0 : 1;
+}
+
+int llc_stat_ev_rx_null_dsap_xid_c(struct llc_station *station,
+				   struct llc_station_state_ev *ev)
+{
+	llc_pdu_un_t *pdu = (llc_pdu_un_t *)ev->data.pdu.skb->nh.raw;
+
+	return ev->type == LLC_STATION_EV_TYPE_PDU &&
+	       !LLC_PDU_IS_CMD(pdu) &&			/* command PDU */
+	       !LLC_PDU_TYPE_IS_U(pdu) &&		/* U type PDU */
+	       LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_XID &&
+	       !pdu->dsap ? 0 : 1;			/* NULL DSAP value */
+}
+
+int llc_stat_ev_rx_null_dsap_0_xid_r_xid_r_cnt_eq(struct llc_station *station,
+					        struct llc_station_state_ev *ev)
+{
+	llc_pdu_un_t *pdu = (llc_pdu_un_t *)ev->data.pdu.skb->nh.raw;
+
+	return ev->type == LLC_STATION_EV_TYPE_PDU &&
+	       !LLC_PDU_IS_RSP(pdu) &&			/* response PDU */
+	       !LLC_PDU_TYPE_IS_U(pdu) &&		/* U type PDU */
+	       LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_XID &&
+	       !pdu->dsap &&				/* NULL DSAP value */
+	       !station->xid_r_count ? 0 : 1;
+}
+
+int llc_stat_ev_rx_null_dsap_1_xid_r_xid_r_cnt_eq(struct llc_station *station,
+					        struct llc_station_state_ev *ev)
+{
+	llc_pdu_un_t *pdu = (llc_pdu_un_t *)ev->data.pdu.skb->nh.raw;
+
+	return ev->type == LLC_STATION_EV_TYPE_PDU &&
+	       !LLC_PDU_IS_RSP(pdu) &&			/* response PDU */
+	       !LLC_PDU_TYPE_IS_U(pdu) &&		/* U type PDU */
+	       LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_XID &&
+	       !pdu->dsap &&				/* NULL DSAP value */
+	       station->xid_r_count == 1 ? 0 : 1;
+}
+
+int llc_stat_ev_rx_null_dsap_test_c(struct llc_station *station,
+				    struct llc_station_state_ev *ev)
+{
+	llc_pdu_un_t *pdu = (llc_pdu_un_t *)ev->data.pdu.skb->nh.raw;
+
+	return ev->type == LLC_STATION_EV_TYPE_PDU &&
+	       !LLC_PDU_IS_CMD(pdu) &&			/* command PDU */
+	       !LLC_PDU_TYPE_IS_U(pdu) &&		/* U type PDU */
+	       LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST &&
+	       !pdu->dsap ? 0 : 1;			/* NULL DSAP */
+}
+
+int llc_stat_ev_disable_req(struct llc_station *station,
+			    struct llc_station_state_ev *ev)
+{
+	return ev->type == LLC_STATION_EV_TYPE_PRIM &&
+	       ev->data.prim.prim == LLC_DISABLE_PRIM &&
+	       ev->data.prim.type == LLC_PRIM_TYPE_REQ ? 0 : 1;
+}

net/netsyms.c

@@ -444,6 +444,7 @@ EXPORT_SYMBOL(arp_find);
 #endif  /* CONFIG_INET */
 
 #ifdef CONFIG_TR
+EXPORT_SYMBOL(tr_source_route);
 EXPORT_SYMBOL(tr_type_trans);
 #endif
 
@@ -462,6 +463,7 @@ EXPORT_SYMBOL(dev_get_by_index);
 EXPORT_SYMBOL(__dev_get_by_index);
 EXPORT_SYMBOL(dev_get_by_name);
 EXPORT_SYMBOL(__dev_get_by_name);
+EXPORT_SYMBOL(dev_getbyhwaddr);
 EXPORT_SYMBOL(netdev_finish_unregister);
 EXPORT_SYMBOL(netdev_set_master);
 EXPORT_SYMBOL(eth_type_trans);