Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

net/llc/llc_input.c

@@ -0,0 +1,189 @@
+/*
+ * llc_input.c - Minimal input path for LLC
+ *
+ * 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/netdevice.h>
+#include <net/llc.h>
+#include <net/llc_pdu.h>
+#include <net/llc_sap.h>
+
+#if 0
+#define dprintk(args...) printk(KERN_DEBUG args)
+#else
+#define dprintk(args...)
+#endif
+
+/*
+ * Packet handler for the station, registerable because in the minimal
+ * LLC core that is taking shape only the very minimal subset of LLC that
+ * is needed for things like IPX, Appletalk, etc will stay, with all the
+ * rest in the llc1 and llc2 modules.
+ */
+static void (*llc_station_handler)(struct sk_buff *skb);
+
+/*
+ * Packet handlers for LLC_DEST_SAP and LLC_DEST_CONN.
+ */
+static void (*llc_type_handlers[2])(struct llc_sap *sap,
+				    struct sk_buff *skb);
+
+void llc_add_pack(int type, void (*handler)(struct llc_sap *sap,
+					    struct sk_buff *skb))
+{
+	if (type == LLC_DEST_SAP || type == LLC_DEST_CONN)
+		llc_type_handlers[type - 1] = handler;
+}
+
+void llc_remove_pack(int type)
+{
+	if (type == LLC_DEST_SAP || type == LLC_DEST_CONN)
+		llc_type_handlers[type - 1] = NULL;
+}
+
+void llc_set_station_handler(void (*handler)(struct sk_buff *skb))
+{
+	llc_station_handler = handler;
+}
+
+/**
+ *	llc_pdu_type - returns which LLC component must handle for PDU
+ *	@skb: input skb
+ *
+ *	This function returns which LLC component must handle this PDU.
+ */
+static __inline__ int llc_pdu_type(struct sk_buff *skb)
+{
+	int type = LLC_DEST_CONN; /* I-PDU or S-PDU type */
+	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+
+	if ((pdu->ctrl_1 & LLC_PDU_TYPE_MASK) != LLC_PDU_TYPE_U)
+		goto out;
+	switch (LLC_U_PDU_CMD(pdu)) {
+	case LLC_1_PDU_CMD_XID:
+	case LLC_1_PDU_CMD_UI:
+	case LLC_1_PDU_CMD_TEST:
+		type = LLC_DEST_SAP;
+		break;
+	case LLC_2_PDU_CMD_SABME:
+	case LLC_2_PDU_CMD_DISC:
+	case LLC_2_PDU_RSP_UA:
+	case LLC_2_PDU_RSP_DM:
+	case LLC_2_PDU_RSP_FRMR:
+		break;
+	default:
+		type = LLC_DEST_INVALID;
+		break;
+	}
+out:
+	return type;
+}
+
+/**
+ *	llc_fixup_skb - initializes skb pointers
+ *	@skb: This argument points to incoming skb
+ *
+ *	Initializes internal skb pointer to start of network layer by deriving
+ *	length of LLC header; finds length of LLC control field in LLC header
+ *	by looking at the two lowest-order bits of the first control field
+ *	byte; field is either 3 or 4 bytes long.
+ */
+static inline int llc_fixup_skb(struct sk_buff *skb)
+{
+	u8 llc_len = 2;
+	struct llc_pdu_sn *pdu;
+
+	if (!pskb_may_pull(skb, sizeof(*pdu)))
+		return 0;
+
+	pdu = (struct llc_pdu_sn *)skb->data;
+	if ((pdu->ctrl_1 & LLC_PDU_TYPE_MASK) == LLC_PDU_TYPE_U)
+		llc_len = 1;
+	llc_len += 2;
+	skb->h.raw += llc_len;
+	skb_pull(skb, llc_len);
+	if (skb->protocol == htons(ETH_P_802_2)) {
+		u16 pdulen = eth_hdr(skb)->h_proto,
+		    data_size = ntohs(pdulen) - llc_len;
+
+		skb_trim(skb, data_size);
+	}
+	return 1;
+}
+
+/**
+ *	llc_rcv - 802.2 entry point from net lower layers
+ *	@skb: received pdu
+ *	@dev: device that receive pdu
+ *	@pt: packet type
+ *
+ *	When the system receives a 802.2 frame this function is called. It
+ *	checks SAP and connection of received pdu and passes frame to
+ *	llc_{station,sap,conn}_rcv for sending to proper state machine. If
+ *	the frame is related to a busy connection (a connection is sending
+ *	data now), it queues this frame in the connection's backlog.
+ */
+int llc_rcv(struct sk_buff *skb, struct net_device *dev,
+	    struct packet_type *pt)
+{
+	struct llc_sap *sap;
+	struct llc_pdu_sn *pdu;
+	int dest;
+
+	/*
+	 * When the interface is in promisc. mode, drop all the crap that it
+	 * receives, do not try to analyse it.
+	 */
+	if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) {
+		dprintk("%s: PACKET_OTHERHOST\n", __FUNCTION__);
+		goto drop;
+	}
+	skb = skb_share_check(skb, GFP_ATOMIC);
+	if (unlikely(!skb))
+		goto out;
+	if (unlikely(!llc_fixup_skb(skb)))
+		goto drop;
+	pdu = llc_pdu_sn_hdr(skb);
+	if (unlikely(!pdu->dsap)) /* NULL DSAP, refer to station */
+	       goto handle_station;
+	sap = llc_sap_find(pdu->dsap);
+	if (unlikely(!sap)) {/* unknown SAP */
+		dprintk("%s: llc_sap_find(%02X) failed!\n", __FUNCTION__,
+		        pdu->dsap);
+		goto drop;
+	}
+	/*
+	 * First the upper layer protocols that don't need the full
+	 * LLC functionality
+	 */
+	if (sap->rcv_func) {
+		sap->rcv_func(skb, dev, pt);
+		goto out;
+	}
+	dest = llc_pdu_type(skb);
+	if (unlikely(!dest || !llc_type_handlers[dest - 1]))
+		goto drop;
+	llc_type_handlers[dest - 1](sap, skb);
+out:
+	return 0;
+drop:
+	kfree_skb(skb);
+	goto out;
+handle_station:
+	if (!llc_station_handler)
+		goto drop;
+	llc_station_handler(skb);
+	goto out;
+}
+
+EXPORT_SYMBOL(llc_add_pack);
+EXPORT_SYMBOL(llc_remove_pack);
+EXPORT_SYMBOL(llc_set_station_handler);