Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 189 insertions, 0 deletions

diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
new file mode 100644
index 000000000000..4da6976efc9c
--- /dev/null
+++ b/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);