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, 383 insertions, 0 deletions

diff --git a/net/ax25/ax25_out.c b/net/ax25/ax25_out.c
new file mode 100644
index 000000000000..3475a3ac9343
--- /dev/null
+++ b/net/ax25/ax25_out.c
@@ -0,0 +1,383 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
+ */
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/spinlock.h>
+#include <linux/net.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter.h>
+#include <net/sock.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+
+static DEFINE_SPINLOCK(ax25_frag_lock);
+
+ax25_cb *ax25_send_frame(struct sk_buff *skb, int paclen, ax25_address *src, ax25_address *dest, ax25_digi *digi, struct net_device *dev)
+{
+        ax25_dev *ax25_dev;
+        ax25_cb *ax25;
+
+        /*
+         * Take the default packet length for the device if zero is
+         * specified.
+         */
+        if (paclen == 0) {
+                if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
+                        return NULL;
+
+                paclen = ax25_dev->values[AX25_VALUES_PACLEN];
+        }
+
+        /*
+         * Look for an existing connection.
+         */
+        if ((ax25 = ax25_find_cb(src, dest, digi, dev)) != NULL) {
+                ax25_output(ax25, paclen, skb);
+                return ax25;            /* It already existed */
+        }
+
+        if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
+                return NULL;
+
+        if ((ax25 = ax25_create_cb()) == NULL)
+                return NULL;
+
+        ax25_fillin_cb(ax25, ax25_dev);
+
+        ax25->source_addr = *src;
+        ax25->dest_addr   = *dest;
+
+        if (digi != NULL) {
+                if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
+                        ax25_cb_put(ax25);
+                        return NULL;
+                }
+                memcpy(ax25->digipeat, digi, sizeof(ax25_digi));
+        }
+
+        switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
+        case AX25_PROTO_STD_SIMPLEX:
+        case AX25_PROTO_STD_DUPLEX:
+                ax25_std_establish_data_link(ax25);
+                break;
+
+#ifdef CONFIG_AX25_DAMA_SLAVE
+        case AX25_PROTO_DAMA_SLAVE:
+                if (ax25_dev->dama.slave)
+                        ax25_ds_establish_data_link(ax25);
+                else
+                        ax25_std_establish_data_link(ax25);
+                break;
+#endif
+        }
+
+        ax25_cb_add(ax25);
+
+        ax25->state = AX25_STATE_1;
+
+        ax25_start_heartbeat(ax25);
+
+        ax25_output(ax25, paclen, skb);
+
+        return ax25;                    /* We had to create it */
+}
+
+/*
+ *      All outgoing AX.25 I frames pass via this routine. Therefore this is
+ *      where the fragmentation of frames takes place. If fragment is set to
+ *      zero then we are not allowed to do fragmentation, even if the frame
+ *      is too large.
+ */
+void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
+{
+        struct sk_buff *skbn;
+        unsigned char *p;
+        int frontlen, len, fragno, ka9qfrag, first = 1;
+
+        if ((skb->len - 1) > paclen) {
+                if (*skb->data == AX25_P_TEXT) {
+                        skb_pull(skb, 1); /* skip PID */
+                        ka9qfrag = 0;
+                } else {
+                        paclen -= 2;    /* Allow for fragment control info */
+                        ka9qfrag = 1;
+                }
+
+                fragno = skb->len / paclen;
+                if (skb->len % paclen == 0) fragno--;
+
+                frontlen = skb_headroom(skb);   /* Address space + CTRL */
+
+                while (skb->len > 0) {
+                        spin_lock_bh(&ax25_frag_lock);
+                        if ((skbn = alloc_skb(paclen + 2 + frontlen, GFP_ATOMIC)) == NULL) {
+                                spin_unlock_bh(&ax25_frag_lock);
+                                printk(KERN_CRIT "AX.25: ax25_output - out of memory\n");
+                                return;
+                        }
+
+                        if (skb->sk != NULL)
+                                skb_set_owner_w(skbn, skb->sk);
+
+                        spin_unlock_bh(&ax25_frag_lock);
+
+                        len = (paclen > skb->len) ? skb->len : paclen;
+
+                        if (ka9qfrag == 1) {
+                                skb_reserve(skbn, frontlen + 2);
+                                skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
+                                memcpy(skb_put(skbn, len), skb->data, len);
+                                p = skb_push(skbn, 2);
+
+                                *p++ = AX25_P_SEGMENT;
+
+                                *p = fragno--;
+                                if (first) {
+                                        *p |= AX25_SEG_FIRST;
+                                        first = 0;
+                                }
+                        } else {
+                                skb_reserve(skbn, frontlen + 1);
+                                skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
+                                memcpy(skb_put(skbn, len), skb->data, len);
+                                p = skb_push(skbn, 1);
+                                *p = AX25_P_TEXT;
+                        }
+
+                        skb_pull(skb, len);
+                        skb_queue_tail(&ax25->write_queue, skbn); /* Throw it on the queue */
+                }
+
+                kfree_skb(skb);
+        } else {
+                skb_queue_tail(&ax25->write_queue, skb);          /* Throw it on the queue */
+        }
+
+        switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
+        case AX25_PROTO_STD_SIMPLEX:
+        case AX25_PROTO_STD_DUPLEX:
+                ax25_kick(ax25);
+                break;
+
+#ifdef CONFIG_AX25_DAMA_SLAVE
+        /*
+         * A DAMA slave is _required_ to work as normal AX.25L2V2
+         * if no DAMA master is available.
+         */
+        case AX25_PROTO_DAMA_SLAVE:
+                if (!ax25->ax25_dev->dama.slave) ax25_kick(ax25);
+                break;
+#endif
+        }
+}
+
+/*
+ *  This procedure is passed a buffer descriptor for an iframe. It builds
+ *  the rest of the control part of the frame and then writes it out.
+ */
+static void ax25_send_iframe(ax25_cb *ax25, struct sk_buff *skb, int poll_bit)
+{
+        unsigned char *frame;
+
+        if (skb == NULL)
+                return;
+
+        skb->nh.raw = skb->data;
+
+        if (ax25->modulus == AX25_MODULUS) {
+                frame = skb_push(skb, 1);
+
+                *frame = AX25_I;
+                *frame |= (poll_bit) ? AX25_PF : 0;
+                *frame |= (ax25->vr << 5);
+                *frame |= (ax25->vs << 1);
+        } else {
+                frame = skb_push(skb, 2);
+
+                frame[0] = AX25_I;
+                frame[0] |= (ax25->vs << 1);
+                frame[1] = (poll_bit) ? AX25_EPF : 0;
+                frame[1] |= (ax25->vr << 1);
+        }
+
+        ax25_start_idletimer(ax25);
+
+        ax25_transmit_buffer(ax25, skb, AX25_COMMAND);
+}
+
+void ax25_kick(ax25_cb *ax25)
+{
+        struct sk_buff *skb, *skbn;
+        int last = 1;
+        unsigned short start, end, next;
+
+        if (ax25->state != AX25_STATE_3 && ax25->state != AX25_STATE_4)
+                return;
+
+        if (ax25->condition & AX25_COND_PEER_RX_BUSY)
+                return;
+
+        if (skb_peek(&ax25->write_queue) == NULL)
+                return;
+
+        start = (skb_peek(&ax25->ack_queue) == NULL) ? ax25->va : ax25->vs;
+        end   = (ax25->va + ax25->window) % ax25->modulus;
+
+        if (start == end)
+                return;
+
+        ax25->vs = start;
+
+        /*
+         * Transmit data until either we're out of data to send or
+         * the window is full. Send a poll on the final I frame if
+         * the window is filled.
+         */
+
+        /*
+         * Dequeue the frame and copy it.
+         */
+        skb  = skb_dequeue(&ax25->write_queue);
+
+        do {
+                if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
+                        skb_queue_head(&ax25->write_queue, skb);
+                        break;
+                }
+
+                if (skb->sk != NULL)
+                        skb_set_owner_w(skbn, skb->sk);
+
+                next = (ax25->vs + 1) % ax25->modulus;
+                last = (next == end);
+
+                /*
+                 * Transmit the frame copy.
+                 * bke 960114: do not set the Poll bit on the last frame
+                 * in DAMA mode.
+                 */
+                switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
+                case AX25_PROTO_STD_SIMPLEX:
+                case AX25_PROTO_STD_DUPLEX:
+                        ax25_send_iframe(ax25, skbn, (last) ? AX25_POLLON : AX25_POLLOFF);
+                        break;
+
+#ifdef CONFIG_AX25_DAMA_SLAVE
+                case AX25_PROTO_DAMA_SLAVE:
+                        ax25_send_iframe(ax25, skbn, AX25_POLLOFF);
+                        break;
+#endif
+                }
+
+                ax25->vs = next;
+
+                /*
+                 * Requeue the original data frame.
+                 */
+                skb_queue_tail(&ax25->ack_queue, skb);
+
+        } while (!last && (skb = skb_dequeue(&ax25->write_queue)) != NULL);
+
+        ax25->condition &= ~AX25_COND_ACK_PENDING;
+
+        if (!ax25_t1timer_running(ax25)) {
+                ax25_stop_t3timer(ax25);
+                ax25_calculate_t1(ax25);
+                ax25_start_t1timer(ax25);
+        }
+}
+
+void ax25_transmit_buffer(ax25_cb *ax25, struct sk_buff *skb, int type)
+{
+        struct sk_buff *skbn;
+        unsigned char *ptr;
+        int headroom;
+
+        if (ax25->ax25_dev == NULL) {
+                ax25_disconnect(ax25, ENETUNREACH);
+                return;
+        }
+
+        headroom = ax25_addr_size(ax25->digipeat);
+
+        if (skb_headroom(skb) < headroom) {
+                if ((skbn = skb_realloc_headroom(skb, headroom)) == NULL) {
+                        printk(KERN_CRIT "AX.25: ax25_transmit_buffer - out of memory\n");
+                        kfree_skb(skb);
+                        return;
+                }
+
+                if (skb->sk != NULL)
+                        skb_set_owner_w(skbn, skb->sk);
+
+                kfree_skb(skb);
+                skb = skbn;
+        }
+
+        ptr = skb_push(skb, headroom);
+
+        ax25_addr_build(ptr, &ax25->source_addr, &ax25->dest_addr, ax25->digipeat, type, ax25->modulus);
+
+        skb->dev = ax25->ax25_dev->dev;
+
+        ax25_queue_xmit(skb);
+}
+
+/*
+ *      A small shim to dev_queue_xmit to add the KISS control byte, and do
+ *      any packet forwarding in operation.
+ */
+void ax25_queue_xmit(struct sk_buff *skb)
+{
+        unsigned char *ptr;
+
+        skb->protocol = htons(ETH_P_AX25);
+        skb->dev      = ax25_fwd_dev(skb->dev);
+
+        ptr  = skb_push(skb, 1);
+        *ptr = 0x00;                    /* KISS */
+
+        dev_queue_xmit(skb);
+}
+
+int ax25_check_iframes_acked(ax25_cb *ax25, unsigned short nr)
+{
+        if (ax25->vs == nr) {
+                ax25_frames_acked(ax25, nr);
+                ax25_calculate_rtt(ax25);
+                ax25_stop_t1timer(ax25);
+                ax25_start_t3timer(ax25);
+                return 1;
+        } else {
+                if (ax25->va != nr) {
+                        ax25_frames_acked(ax25, nr);
+                        ax25_calculate_t1(ax25);
+                        ax25_start_t1timer(ax25);
+                        return 1;
+                }
+        }
+        return 0;
+}
+