[LLC] kill sap->{ind,conf}, finally!

With this one the sap->ind and ->conf callbacks are gone, now the core
is tightly integrated with the socket layer (PF_LLC) and the
datalink_protos are mostly working like when the old LLC stack was
in the kernel, i.e. without special receiving routines for IPX in
802.2 mode, now I have to work on the UI sending routines to kill more
stupid structs. 

include/net/llc_c_ev.h

@@ -138,9 +138,8 @@ struct llc_conn_state_ev {
 	u8			  type;
 	u8			  reason;
 	u8			  status;
-	u8			  flag;
-	struct llc_prim_if_block *ind_prim;
-	struct llc_prim_if_block *cfm_prim;
+	u8			  ind_prim;
+	u8			  cfm_prim;
 	union llc_conn_ev_if	  data;
 };
 

include/net/llc_conn.h

@@ -100,6 +100,9 @@ extern struct sock *llc_lookup_established(struct llc_sap *sap,
 					   struct llc_addr *laddr);
 extern struct sock *llc_lookup_listener(struct llc_sap *sap,
 					struct llc_addr *laddr);
+extern struct sock *llc_lookup_dgram(struct llc_sap *sap,
+				     struct llc_addr *laddr);
+extern void llc_save_primitive(struct sk_buff* skb, u8 prim);
 extern u8 llc_data_accept_state(u8 state);
 extern void llc_build_offset_table(void);
 #endif /* LLC_CONN_H */

include/net/llc_if.h

@@ -17,17 +17,17 @@
 #include <linux/if_arp.h>
 #include <linux/llc.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 /* Not supported at this time */
-#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_DATAUNIT_PRIM	1
+#define LLC_CONN_PRIM		2
+#define LLC_DATA_PRIM		3
+#define LLC_DISC_PRIM		4
+#define LLC_RESET_PRIM		5
+#define LLC_FLOWCONTROL_PRIM	6 /* Not supported at this time */
+#define LLC_DISABLE_PRIM	7
+#define LLC_XID_PRIM		8
+#define LLC_TEST_PRIM		9
+#define LLC_SAP_ACTIVATION     10
+#define LLC_SAP_DEACTIVATION   11
 
 #define LLC_NBR_PRIMITIVES     11
 
@@ -110,23 +110,21 @@ struct llc_prim_if_block {
 	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 struct llc_sap *llc_sap_open(u8 lsap,
+				    int (*func)(struct sk_buff *skb,
+						struct net_device *dev,
+						struct packet_type *pt));
 extern void llc_sap_close(struct llc_sap *sap);
 
 extern int llc_establish_connection(struct sock *sk, u8 *lmac,
 				    u8 *dmac, u8 dsap);
 extern int llc_build_and_send_pkt(struct sock *sk, struct sk_buff *skb);
-extern void llc_build_and_send_ui_pkt(struct llc_sap *sap,
-				      struct sk_buff *skb,
+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,
+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,
+extern void llc_build_and_send_test_pkt(struct llc_sap *sap, struct sk_buff *skb,
 					u8 *dmac, u8 dsap);
 extern int llc_send_disc(struct sock *sk);
 #endif /* LLC_IF_H */

include/net/llc_main.h

@@ -64,4 +64,5 @@ extern void llc_station_state_process(struct llc_station *station,
 extern void llc_station_send_pdu(struct llc_station *station,
 				 struct sk_buff *skb);
 extern struct sk_buff *llc_alloc_frame(void);
+extern struct packet_type llc_packet_type;
 #endif /* LLC_MAIN_H */

include/net/llc_s_ev.h

@@ -60,6 +60,7 @@ union llc_sap_ev_if {
 struct llc_prim_if_block;
 
 struct llc_sap_state_ev {
+	u8			  primitive;
 	u8			  type;
 	u8			  reason;
 	u8			  ind_cfm_flag;

include/net/llc_sap.h

@@ -12,6 +12,7 @@
  * 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
  *
@@ -29,10 +30,9 @@ struct llc_sap {
 	u8			 state;
 	u8			 p_bit;
 	u8			 f_bit;
-	llc_prim_call_t		 ind;
-	llc_prim_call_t		 conf;
-	struct llc_prim_if_block llc_ind_prim, llc_cfm_prim;
-	union llc_u_prim_data	 llc_ind_data_prim, llc_cfm_data_prim;
+	int			 (*rcv_func)(struct sk_buff *skb,
+					     struct net_device *dev,
+					     struct packet_type *pt);
 	struct llc_addr		 laddr;
 	struct list_head	 node;
 	struct {
@@ -45,7 +45,8 @@ 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_state_process(struct llc_sap *sap, struct sk_buff *skb);
+extern void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb,
+				  struct packet_type *pt);
 extern void llc_sap_rtn_pdu(struct llc_sap *sap, struct sk_buff *skb);
 extern void llc_sap_send_pdu(struct llc_sap *sap, struct sk_buff *skb);
 #endif /* LLC_SAP_H */

include/net/p8022.h

 #ifndef _NET_P8022_H
 #define _NET_P8022_H
-#include <net/llc_if.h>
-
-extern struct datalink_proto *register_8022_client(unsigned char type,
-			   int (*indicate)(struct llc_prim_if_block *prim));
+extern struct datalink_proto *
+	register_8022_client(unsigned char type,
+			     int (*func)(struct sk_buff *skb,
+					 struct net_device *dev,
+					 struct packet_type *pt));
 extern void unregister_8022_client(struct datalink_proto *proto);
 
 #endif

net/802/p8022.c

@@ -33,7 +33,9 @@ static int p8022_request(struct datalink_proto *dl, struct sk_buff *skb,
 }
 
 struct datalink_proto *register_8022_client(unsigned char type,
-			  int (*indicate)(struct llc_prim_if_block *prim))
+					    int (*func)(struct sk_buff *skb,
+							struct net_device *dev,
+							struct packet_type *pt))
 {
 	struct datalink_proto *proto;
 
@@ -42,7 +44,7 @@ struct datalink_proto *register_8022_client(unsigned char type,
 		proto->type[0]		= type;
 		proto->header_length	= 3;
 		proto->request		= p8022_request;
-		proto->sap = llc_sap_open(indicate, NULL, type);
+		proto->sap = llc_sap_open(type, func);
 		if (!proto->sap) {
 			kfree(proto);
 			proto = NULL;

net/802/psnap.c

@@ -51,32 +51,23 @@ static struct datalink_proto *find_snap_client(unsigned char *desc)
 /*
  *	A SNAP packet has arrived
  */
-static int snap_indicate(struct llc_prim_if_block *prim)
+static int snap_rcv(struct sk_buff *skb, struct net_device *dev,
+		    struct packet_type *pt)
 {
-	struct sk_buff *skb;
-	struct datalink_proto *proto;
 	int rc = 1;
-	static struct packet_type psnap_packet_type = {
-		.type = __constant_htons(ETH_P_SNAP),
-	};
-
-	if (prim->prim != LLC_DATAUNIT_PRIM)
-		goto out;
-
-	skb = prim->data->udata.skb;
-	proto = find_snap_client(skb->h.raw);
+	struct datalink_proto *proto = find_snap_client(skb->h.raw);
 
 	if (proto) {
 		/* Pass the frame on. */
 		skb->h.raw  += 5;
 		skb_pull(skb, 5);
-		rc = proto->rcvfunc(skb, skb->dev, &psnap_packet_type);
+		rc = proto->rcvfunc(skb, dev, pt);
 	} else {
 		skb->sk = NULL;
 		kfree_skb(skb);
 		rc = 1;
 	}
-out:
+
 	return rc;
 }
 
@@ -99,7 +90,7 @@ EXPORT_SYMBOL(unregister_snap_client);
 
 static int __init snap_init(void)
 {
-	snap_sap = llc_sap_open(snap_indicate, NULL, 0xAA);
+	snap_sap = llc_sap_open(0xAA, snap_rcv);
 
 	if (!snap_sap)
 		printk(KERN_CRIT "SNAP - unable to register with 802.2\n");

net/ipx/af_ipx.c

@@ -2252,22 +2252,6 @@ drop:	kfree_skb(skb);
 out:	return ret;
 }
 
-static int ipx_8022_indicate(struct llc_prim_if_block *prim)
-{
-	int rc = 1;
-	static struct packet_type p8022_packet_type = {
-		.type = __constant_htons(ETH_P_802_2),
-	};
-
-	if (prim->prim == LLC_DATAUNIT_PRIM) {
-		struct sk_buff *skb = prim->data->udata.skb;
-
-		rc = ipx_rcv(skb, skb->dev, &p8022_packet_type);
-	}
-						
-	return rc;
-}
-
 static int ipx_sendmsg(struct socket *sock, struct msghdr *msg, int len,
 	struct scm_cookie *scm)
 {
@@ -2560,7 +2544,7 @@ static int __init ipx_init(void)
 	else
 		printk(ipx_8023_err_msg);
 
-	p8022_datalink = register_8022_client(ipx_8022_type, ipx_8022_indicate);
+	p8022_datalink = register_8022_client(ipx_8022_type, ipx_rcv);
 	if (!p8022_datalink)
 		printk(ipx_llc_err_msg);
 

net/llc/llc_c_ac.c

@@ -65,9 +65,7 @@ int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb)
 		llc_pdu_decode_sa(skb, llc->daddr.mac);
 		llc_pdu_decode_da(skb, llc->laddr.mac);
 		llc->dev = skb->dev;
-		/* FIXME: find better way to notify upper layer */
-		ev->flag     = LLC_CONN_PRIM + 1;
-		ev->ind_prim = (void *)1;
+		ev->ind_prim = LLC_CONN_PRIM;
 		rc = 0;
 	}
 	return rc;
@@ -77,8 +75,7 @@ int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb)
 {
 	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
-	ev->flag     = LLC_CONN_PRIM + 1;
-	ev->cfm_prim = (void *)1;
+	ev->cfm_prim = LLC_CONN_PRIM;
 	return 0;
 }
 
@@ -86,12 +83,7 @@ static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb)
 {
 	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
-	/*
-	 * FIXME: find better way to tell upper layer that the packet was
-	 * confirmed by the other endpoint
-	 */
-	ev->flag     = LLC_DATA_PRIM + 1;
-	ev->cfm_prim = (void *)1;
+	ev->cfm_prim = LLC_DATA_PRIM;
 	return 0;
 }
 
@@ -130,8 +122,7 @@ int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb)
 	}
 	if (!rc) {
 		ev->reason   = reason;
-		ev->flag     = LLC_DISC_PRIM + 1;
-		ev->ind_prim = (void *)1;
+		ev->ind_prim = LLC_DISC_PRIM;
 	}
 	return rc;
 }
@@ -141,8 +132,7 @@ int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb)
 	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	ev->reason   = ev->status;
-	ev->flag     = LLC_DISC_PRIM + 1;
-	ev->cfm_prim = (void *)1;
+	ev->cfm_prim = LLC_DISC_PRIM;
 	return 0;
 }
 
@@ -184,18 +174,8 @@ int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
 			break;
 	}
 	if (!rc) {
-		struct llc_sap *sap = llc->sap;
-		struct llc_prim_if_block *prim = &sap->llc_ind_prim;
-		union llc_u_prim_data *prim_data = prim->data;
-
-		prim_data->res.sk     = sk;
-		prim_data->res.link   = llc->link;
-		prim->data	      = prim_data;
-		prim->prim	      = LLC_RESET_PRIM;
-		prim->sap	      = sap;
 		ev->reason   = reason;
-		ev->flag	      = 1;
-		ev->ind_prim	      = prim;
+		ev->ind_prim = LLC_RESET_PRIM;
 	}
 	return rc;
 }
@@ -203,18 +183,9 @@ int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
 int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb)
 {
 	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
-	struct llc_opt *llc = llc_sk(sk);
-	struct llc_sap *sap = llc->sap;
-	struct llc_prim_if_block *prim = &sap->llc_cfm_prim;
-	union llc_u_prim_data *prim_data = prim->data;
-
-	prim_data->res.sk   = sk;
-	prim_data->res.link = llc->link;
-	prim->data	    = prim_data;
-	prim->prim	    = LLC_RESET_PRIM;
-	prim->sap	    = sap;
-	ev->flag	    = 1;
-	ev->cfm_prim	    = prim;
+
+	ev->reason   = 0;
+	ev->cfm_prim = LLC_RESET_PRIM;
 	return 0;
 }
 

net/llc/llc_conn.c

@@ -39,12 +39,12 @@ static struct llc_conn_state_trans *llc_qualify_conn_ev(struct sock *sk,
 /* Offset table on connection states transition diagram */
 static int llc_offset_table[NBR_CONN_STATES][NBR_CONN_EV];
 
-void llc_save_primitive(struct sock *sk, struct sk_buff* skb, u8 prim)
+void llc_save_primitive(struct sk_buff* skb, u8 prim)
 {
 	struct sockaddr_llc *addr = llc_ui_skb_cb(skb);
 
        /* save primitive for use by the user. */
-	addr->sllc_family = sk->family;
+	addr->sllc_family = skb->sk->family;
 	addr->sllc_arphrd = skb->dev->type;
 	addr->sllc_test   = prim == LLC_TEST_PRIM;
 	addr->sllc_xid    = prim == LLC_XID_PRIM;
@@ -67,48 +67,39 @@ void llc_save_primitive(struct sock *sk, struct sk_buff* skb, u8 prim)
  */
 int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 {
-	/* sending event to state machine */
-	int rc = llc_conn_service(sk, skb);
+	int rc;
 	struct llc_opt *llc = llc_sk(sk);
 	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
-	u8 flag = ev->flag;
-	u8 status = ev->status;
-	struct llc_prim_if_block *ind_prim = ev->ind_prim;
-	struct llc_prim_if_block *cfm_prim = ev->cfm_prim;
 
-	/*
-	 * FIXME: this will vanish as soon I get rid of the last prim crap
-	 */
-	if (flag != LLC_DATA_PRIM + 1 && flag != LLC_CONN_PRIM + 1 &&
-	    flag != LLC_DISC_PRIM + 1)
-		llc_conn_free_ev(skb);
-	else if (ind_prim && cfm_prim)
-		skb_get(skb);
-	if (!flag)   /* indicate or confirm not required */
+	ev->ind_prim = ev->cfm_prim = 0;
+	rc = llc_conn_service(sk, skb); /* sending event to state machine */
+	if (rc) {
+		printk(KERN_ERR "%s: llc_conn_service failed\n", __FUNCTION__);
+		goto out_kfree_skb;
+	}
+
+	if (!ev->ind_prim && !ev->cfm_prim) {   /* indicate or confirm not required */
+		if (!skb->list)
+			goto out_kfree_skb;
 		goto out;
-	rc = 0;
-	if (ind_prim) { /* indication required */
-		/*
-		 * FIXME: this will be saner as soon I get rid of the double
-		 *	  sock crap
-		 */
-		switch (flag) {
-		case LLC_DATA_PRIM + 1:
-			llc_save_primitive(sk, skb, LLC_DATA_PRIM);
+	}
+
+	if (ev->ind_prim && ev->cfm_prim)
+		skb_get(skb);
+
+	switch (ev->ind_prim) {
+	case LLC_DATA_PRIM:
+		llc_save_primitive(skb, LLC_DATA_PRIM);
 		if (sock_queue_rcv_skb(sk, skb)) {
 			/*
-				 * FIXME: have to sync the LLC state
-				 *        machine wrt mem usage with
-				 *        sk->{r,w}mem_alloc, will do
-				 *        this soon 8)
+			 * shouldn't happen
 			 */
-				printk(KERN_ERR
-				       "%s: sock_queue_rcv_skb failed!\n",
+			printk(KERN_ERR "%s: sock_queue_rcv_skb failed!\n",
 			       __FUNCTION__);
 			kfree_skb(skb);
 		}
 		break;
-		case LLC_CONN_PRIM + 1: {
+	case LLC_CONN_PRIM: {
 		struct sock *parent = skb->sk;
 
 		skb->sk = sk;
@@ -116,7 +107,7 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 		sk->state_change(parent);
 	}
 		break;
-		case LLC_DISC_PRIM + 1:
+	case LLC_DISC_PRIM:
 		sock_hold(sk);
 		if (sk->type == SOCK_STREAM && sk->state == TCP_ESTABLISHED) {
 			sk->shutdown       = SHUTDOWN_MASK;
@@ -130,25 +121,34 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 		kfree_skb(skb);
 		sock_put(sk);
 		break;
+	case LLC_RESET_PRIM:
+		/*
+		 * FIXME:
+		 * RESET is not being notified to upper layers for now
+		 */
+		printk(KERN_INFO "%s: received a reset ind!\n", __FUNCTION__);
+		kfree_skb(skb);
+		break;
 	default:
-			llc->sap->ind(ind_prim);
+		if (ev->ind_prim) {
+			printk(KERN_INFO "%s: received unknown %d prim!\n",
+				__FUNCTION__, ev->ind_prim);
+			kfree_skb(skb);
 		}
+		/* No indication */
+		break;
 	}
-	if (!cfm_prim)  /* confirmation not required */
-		goto out;
-	/* FIXME: see FIXMEs above */
-	switch (flag) {
-	case LLC_DATA_PRIM + 1:
+
+	switch (ev->cfm_prim) {
+	case LLC_DATA_PRIM:
 		if (!llc_data_accept_state(llc->state))
-			/* In this state, we can send I pdu */
 			sk->write_space(sk);
 		else
 			rc = llc->failed_data_req = 1;
 		break;
-	case LLC_CONN_PRIM + 1:
-		if (sk->type != SOCK_STREAM || sk->state != TCP_SYN_SENT)
-			goto out_kfree_skb;
-		if (status) {
+	case LLC_CONN_PRIM:
+		if (sk->type == SOCK_STREAM && sk->state == TCP_SYN_SENT) {
+			if (ev->status) {
 				sk->socket->state = SS_UNCONNECTED;
 				sk->state         = TCP_CLOSE;
 			} else {
@@ -156,21 +156,31 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 				sk->state         = TCP_ESTABLISHED;
 			}
 			sk->state_change(sk);
+		}
 		break;
-	case LLC_DISC_PRIM + 1:
+	case LLC_DISC_PRIM:
 		sock_hold(sk);
-		if (sk->type != SOCK_STREAM || sk->state != TCP_CLOSING) {
-			sock_put(sk);
-			goto out_kfree_skb;
-		}
+		if (sk->type == SOCK_STREAM && sk->state == TCP_CLOSING) {
 			sk->socket->state = SS_UNCONNECTED;
 			sk->state         = TCP_CLOSE;
 			sk->state_change(sk);
+		}
 		sock_put(sk);
 		break;
+	case LLC_RESET_PRIM:
+		/*
+		 * FIXME:
+		 * RESET is not being notified to upper layers for now
+		 */
+		printk(KERN_INFO "%s: received a reset conf!\n", __FUNCTION__);
+		break;
 	default:
-		llc->sap->conf(cfm_prim);
-		goto out;
+		if (ev->cfm_prim) {
+			printk(KERN_INFO "%s: received unknown %d prim!\n",
+					__FUNCTION__, ev->cfm_prim);
+			break;
+		}
+		goto out; /* No confirmation */
 	}
 out_kfree_skb:
 	kfree_skb(skb);
@@ -198,9 +208,7 @@ void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb)
 {
 	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
-	/* FIXME: indicate that we should send this to the upper layer */
-	ev->flag     = LLC_DATA_PRIM + 1;
-	ev->ind_prim = (void *)1;
+	ev->ind_prim = LLC_DATA_PRIM;
 }
 
 /**
@@ -355,12 +363,14 @@ void llc_conn_free_ev(struct sk_buff *skb)
 		/* free the frame that is bound to this event */
 		struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
-		if (LLC_PDU_TYPE_IS_I(pdu) || !ev->flag || !ev->ind_prim)
+		if (LLC_PDU_TYPE_IS_I(pdu) || !ev->ind_prim)
 			kfree_skb(skb);
 	} else if (ev->type == LLC_CONN_EV_TYPE_PRIM &&
 		   ev->data.prim.prim != LLC_DATA_PRIM)
 		kfree_skb(skb);
-	else if (ev->type == LLC_CONN_EV_TYPE_P_TMR)
+	else if (ev->type == LLC_CONN_EV_TYPE_P_TMR ||
+		 ev->type == LLC_CONN_EV_TYPE_BUSY_TMR ||
+		 ev->type == LLC_CONN_EV_TYPE_REJ_TMR)
 		kfree_skb(skb);
 }
 
@@ -540,6 +550,38 @@ struct sock *llc_lookup_listener(struct llc_sap *sap, struct llc_addr *laddr)
 	return rc;
 }
 
+/**
+ *	llc_lookup_dgram - Finds dgram socket for the local sap/mac
+ *	@sap: SAP
+ *	@laddr: address of local LLC (MAC + SAP)
+ *
+ *	Search socket list of the SAP and finds connection using the local
+ *	mac, and local sap. Returns pointer for socket found, %NULL otherwise.
+ */
+struct sock *llc_lookup_dgram(struct llc_sap *sap, struct llc_addr *laddr)
+{
+	struct sock *rc = NULL;
+	struct list_head *entry;
+
+	spin_lock_bh(&sap->sk_list.lock);
+	if (list_empty(&sap->sk_list.list))
+		goto out;
+	list_for_each(entry, &sap->sk_list.list) {
+		struct llc_opt *llc = list_entry(entry, struct llc_opt, node);
+
+		if (llc->sk->type == SOCK_DGRAM &&
+		    llc->laddr.lsap == laddr->lsap &&
+		    llc_mac_match(llc->laddr.mac, laddr->mac)) {
+			rc = llc->sk;
+			break;
+		}
+	}
+	if (rc)
+		sock_hold(rc);
+out:
+	spin_unlock_bh(&sap->sk_list.lock);
+	return rc;
+}
 /**
  *	llc_data_accept_state - designates if in this state data can be sent.
  *	@state: state of connection.

net/llc/llc_if.c

@@ -30,17 +30,16 @@
 
 /**
  *	llc_sap_open - open interface to the upper layers.
- *	@nw_indicate: pointer to indicate function of upper layer.
- *	@nw_confirm: pointer to confirm function of upper layer.
  *	@lsap: SAP number.
- *	@sap: pointer to allocated SAP (output argument).
+ *	@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(llc_prim_call_t nw_indicate,
-			     llc_prim_call_t nw_confirm, u8 lsap)
+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;
@@ -57,8 +56,7 @@ struct llc_sap *llc_sap_open(llc_prim_call_t nw_indicate,
 		goto err;
 	/* allocated a SAP; initialize it and clear out its memory pool */
 	sap->laddr.lsap = lsap;
-	sap->ind = nw_indicate;
-	sap->conf = nw_confirm;
+	sap->rcv_func = func;
 	sap->parent_station = llc_station_get();
 	/* initialized SAP; add it to list of SAPs this station manages */
 	llc_sap_save(sap);
@@ -117,7 +115,7 @@ void llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
 	ev->data.prim.prim = LLC_DATAUNIT_PRIM;
 	ev->data.prim.type = LLC_PRIM_TYPE_REQ;
 	ev->data.prim.data = &prim;
-	llc_sap_state_process(sap, skb);
+	llc_sap_state_process(sap, skb, &llc_packet_type);
 }
 
 /**
@@ -130,8 +128,8 @@ void llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
  *	This function is called when upper layer wants to send a TEST pdu.
  *	Returns 0 for success, 1 otherwise.
  */
-void llc_build_and_send_test_pkt(struct llc_sap *sap, struct sk_buff *skb,
-				 u8 *dmac, u8 dsap)
+void llc_build_and_send_test_pkt(struct llc_sap *sap, 
+				 struct sk_buff *skb, u8 *dmac, u8 dsap)
 {
 	union llc_u_prim_data prim_data;
 	struct llc_prim_if_block prim;
@@ -151,7 +149,7 @@ void llc_build_and_send_test_pkt(struct llc_sap *sap, struct sk_buff *skb,
 	ev->data.prim.prim = LLC_TEST_PRIM;
 	ev->data.prim.type = LLC_PRIM_TYPE_REQ;
 	ev->data.prim.data = &prim;
-	llc_sap_state_process(sap, skb);
+	llc_sap_state_process(sap, skb, &llc_packet_type);
 }
 
 /**
@@ -185,7 +183,7 @@ void llc_build_and_send_xid_pkt(struct llc_sap *sap, struct sk_buff *skb,
 	ev->data.prim.prim = LLC_XID_PRIM;
 	ev->data.prim.type = LLC_PRIM_TYPE_REQ;
 	ev->data.prim.data = &prim;
-	llc_sap_state_process(sap, skb);
+	llc_sap_state_process(sap, skb, &llc_packet_type);
 }
 
 /**

net/llc/llc_mac.c

@@ -37,7 +37,8 @@ u8 llc_mac_null_var[IFHWADDRLEN];
 
 static void fix_up_incoming_skb(struct sk_buff *skb);
 static void llc_station_rcv(struct sk_buff *skb);
-static void llc_sap_rcv(struct llc_sap *sap, struct sk_buff *skb);
+static void llc_sap_rcv(struct llc_sap *sap, struct sk_buff *skb,
+			struct packet_type *pt);
 
 /**
  *	mac_send_pdu - Sends PDU to specific device.
@@ -113,8 +114,16 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev,
 	}
 	llc_decode_pdu_type(skb, &dest);
 	if (dest == LLC_DEST_SAP) { /* type 1 services */
-		dprintk("%s: calling llc_sap_rcv!\n", __FUNCTION__);
-		llc_sap_rcv(sap, skb);
+		struct llc_addr laddr;
+		struct sock *sk;
+
+		llc_pdu_decode_da(skb, laddr.mac);
+		llc_pdu_decode_dsap(skb, &laddr.lsap);
+
+		skb->sk = sk = llc_lookup_dgram(sap, &laddr);
+		llc_sap_rcv(sap, skb, pt);
+		if (sk)
+			sock_put(sk);
 	} else if (dest == LLC_DEST_CONN) {
 		struct llc_addr saddr, daddr;
 		struct sock *sk;
@@ -245,16 +254,18 @@ int llc_conn_rcv(struct sock* sk, struct sk_buff *skb)
  *	llc_sap_rcv - sends received pdus to the sap state machine
  *	@sap: current sap component structure.
  *	@skb: received frame.
+ *	@pt: packet type
  *
  *	Sends received pdus to the sap state machine.
  */
-static void llc_sap_rcv(struct llc_sap *sap, struct sk_buff *skb)
+static void llc_sap_rcv(struct llc_sap *sap, struct sk_buff *skb,
+			struct packet_type *pt)
 {
 	struct llc_sap_state_ev *ev = llc_sap_ev(skb);
 
 	ev->type   = LLC_SAP_EV_TYPE_PDU;
 	ev->reason = 0;
-	llc_sap_state_process(sap, skb);
+	llc_sap_state_process(sap, skb, pt);
 }
 
 /**

net/llc/llc_main.c

@@ -73,8 +73,6 @@ struct llc_sap *llc_sap_alloc(void)
 		spin_lock_init(&sap->sk_list.lock);
 		INIT_LIST_HEAD(&sap->sk_list.list);
 		skb_queue_head_init(&sap->mac_pdu_q);
-		sap->llc_ind_prim.data = &sap->llc_ind_data_prim;
-		sap->llc_cfm_prim.data = &sap->llc_cfm_data_prim;
 	}
 	return sap;
 }
@@ -621,7 +619,7 @@ static int llc_proc_get_info(char *bf, char **start, off_t offset, int length)
 	return len;
 }
 
-static struct packet_type llc_packet_type = {
+struct packet_type llc_packet_type = {
 	.type = __constant_htons(ETH_P_802_2),
 	.func = llc_rcv,
 	.data = (void *)1,

net/llc/llc_sap.c

@@ -18,6 +18,7 @@
 #include <net/llc_s_ac.h>
 #include <net/llc_s_st.h>
 #include <net/sock.h>
+#include <linux/tcp.h>
 #include <net/llc_main.h>
 #include <net/llc_mac.h>
 #include <net/llc_pdu.h>
@@ -63,21 +64,45 @@ void llc_sap_unassign_sock(struct llc_sap *sap, struct sock *sk)
 
 /**
  *	llc_sap_state_process - sends event to SAP state machine
- *	@sap: pointer to SAP
+ *	@sap: sap to use
  *	@skb: pointer to occurred event
+ *	@pt: packet type, for datalink protos
  *
  *	After executing actions of the event, upper layer will be indicated
- *	if needed(on receiving an UI frame).
+ *	if needed(on receiving an UI frame). sk can be null for the
+ *	datalink_proto case.
  */
-void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb)
+void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb,
+			   struct packet_type *pt)
 {
 	struct llc_sap_state_ev *ev = llc_sap_ev(skb);
 
 	llc_sap_next_state(sap, skb);
-	if (ev->ind_cfm_flag == LLC_IND)
-		sap->ind(ev->prim);
-	else if (ev->type == LLC_SAP_EV_TYPE_PDU)
+	if (ev->ind_cfm_flag == LLC_IND) {
+		if (sap->rcv_func) {
+			/* FIXME:
+			 * Ugly hack, still trying to figure it
+			 * out if this is a bug in IPX or here
+			 * in LLC Land... But hey, it even works,
+			 * no leaks 8)
+			 */
+			if (skb->list)
+				skb_get(skb);
+			sap->rcv_func(skb, skb->dev, pt);
+		} else {
+			if (skb->sk->state == TCP_LISTEN)
+				goto drop;
+
+			llc_save_primitive(skb, ev->primitive);
+
+			/* queue skb to the user. */
+			if (sock_queue_rcv_skb(skb->sk, skb))
+				kfree_skb(skb);
+		}
+	} else if (ev->type == LLC_SAP_EV_TYPE_PDU) {
+drop:
 		kfree_skb(skb);
+	}
 }
 
 /**
@@ -89,43 +114,18 @@ void llc_sap_rtn_pdu(struct llc_sap *sap, struct sk_buff *skb)
 {
 	struct llc_pdu_un *pdu;
 	struct llc_sap_state_ev *ev = llc_sap_ev(skb);
-	struct llc_prim_if_block *prim = &sap->llc_ind_prim;
-	union llc_u_prim_data *prim_data = prim->data;
-	u8 lfb;
 
-	llc_pdu_decode_sa(skb, prim_data->udata.saddr.mac);
-	llc_pdu_decode_da(skb, prim_data->udata.daddr.mac);
-	llc_pdu_decode_dsap(skb, &prim_data->udata.daddr.lsap);
-	llc_pdu_decode_ssap(skb, &prim_data->udata.saddr.lsap);
-	prim_data->udata.pri = 0;
-	prim_data->udata.skb = skb;
 	pdu = llc_pdu_un_hdr(skb);
 	switch (LLC_U_PDU_RSP(pdu)) {
 	case LLC_1_PDU_CMD_TEST:
-			prim->prim = LLC_TEST_PRIM;
-			break;
+		ev->primitive = LLC_TEST_PRIM;	   break;
 	case LLC_1_PDU_CMD_XID:
-			prim->prim = LLC_XID_PRIM;
-			break;
+		ev->primitive = LLC_XID_PRIM;	   break;
 	case LLC_1_PDU_CMD_UI:
-			if (skb->protocol == ntohs(ETH_P_TR_802_2)) {
-				if (((struct trh_hdr *)skb->mac.raw)->rcf) {
-					lfb = ntohs(((struct trh_hdr *)
-						    skb->mac.raw)->rcf) &
-						    0x0070;
-					prim_data->udata.lfb = lfb >> 4;
-				} else {
-					lfb = 0xFF;
-					prim_data->udata.lfb = 0xFF;
-				}
-			}
-			prim->prim = LLC_DATAUNIT_PRIM;
-			break;
+		ev->primitive = LLC_DATAUNIT_PRIM; break;
 	}
-	prim->data = prim_data;
-	prim->sap = sap;
 	ev->ind_cfm_flag = LLC_IND;
-	ev->prim = prim;
+	ev->prim	 = NULL;
 }
 
 /**