1 files changed, 288 insertions, 0 deletions

diff --git a/net/rose/rose_link.c b/net/rose/rose_link.c
new file mode 100644
index 000000000000..09e9e9d04d92
--- /dev/null
+++ b/net/rose/rose_link.c
@@ -0,0 +1,288 @@
+/*
+ * 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) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ */
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/netfilter.h>
+#include <net/rose.h>
+
+static void rose_ftimer_expiry(unsigned long);
+static void rose_t0timer_expiry(unsigned long);
+
+static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
+static void rose_transmit_restart_request(struct rose_neigh *neigh);
+
+void rose_start_ftimer(struct rose_neigh *neigh)
+{
+        del_timer(&neigh->ftimer);
+
+        neigh->ftimer.data     = (unsigned long)neigh;
+        neigh->ftimer.function = &rose_ftimer_expiry;
+        neigh->ftimer.expires  = jiffies + sysctl_rose_link_fail_timeout;
+
+        add_timer(&neigh->ftimer);
+}
+
+static void rose_start_t0timer(struct rose_neigh *neigh)
+{
+        del_timer(&neigh->t0timer);
+
+        neigh->t0timer.data     = (unsigned long)neigh;
+        neigh->t0timer.function = &rose_t0timer_expiry;
+        neigh->t0timer.expires  = jiffies + sysctl_rose_restart_request_timeout;
+
+        add_timer(&neigh->t0timer);
+}
+
+void rose_stop_ftimer(struct rose_neigh *neigh)
+{
+        del_timer(&neigh->ftimer);
+}
+
+void rose_stop_t0timer(struct rose_neigh *neigh)
+{
+        del_timer(&neigh->t0timer);
+}
+
+int rose_ftimer_running(struct rose_neigh *neigh)
+{
+        return timer_pending(&neigh->ftimer);
+}
+
+static int rose_t0timer_running(struct rose_neigh *neigh)
+{
+        return timer_pending(&neigh->t0timer);
+}
+
+static void rose_ftimer_expiry(unsigned long param)
+{
+}
+
+static void rose_t0timer_expiry(unsigned long param)
+{
+        struct rose_neigh *neigh = (struct rose_neigh *)param;
+
+        rose_transmit_restart_request(neigh);
+
+        neigh->dce_mode = 0;
+
+        rose_start_t0timer(neigh);
+}
+
+/*
+ *      Interface to ax25_send_frame. Changes my level 2 callsign depending
+ *      on whether we have a global ROSE callsign or use the default port
+ *      callsign.
+ */
+static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
+{
+        ax25_address *rose_call;
+
+        if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
+                rose_call = (ax25_address *)neigh->dev->dev_addr;
+        else
+                rose_call = &rose_callsign;
+
+        neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
+
+        return (neigh->ax25 != NULL);
+}
+
+/*
+ *      Interface to ax25_link_up. Changes my level 2 callsign depending
+ *      on whether we have a global ROSE callsign or use the default port
+ *      callsign.
+ */
+static int rose_link_up(struct rose_neigh *neigh)
+{
+        ax25_address *rose_call;
+
+        if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
+                rose_call = (ax25_address *)neigh->dev->dev_addr;
+        else
+                rose_call = &rose_callsign;
+
+        neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
+
+        return (neigh->ax25 != NULL);
+}
+
+/*
+ *      This handles all restart and diagnostic frames.
+ */
+void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
+{
+        struct sk_buff *skbn;
+
+        switch (frametype) {
+        case ROSE_RESTART_REQUEST:
+                rose_stop_t0timer(neigh);
+                neigh->restarted = 1;
+                neigh->dce_mode  = (skb->data[3] == ROSE_DTE_ORIGINATED);
+                rose_transmit_restart_confirmation(neigh);
+                break;
+
+        case ROSE_RESTART_CONFIRMATION:
+                rose_stop_t0timer(neigh);
+                neigh->restarted = 1;
+                break;
+
+        case ROSE_DIAGNOSTIC:
+                printk(KERN_WARNING "ROSE: received diagnostic #%d - %02X %02X %02X\n", skb->data[3], skb->data[4], skb->data[5], skb->data[6]);
+                break;
+
+        default:
+                printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
+                break;
+        }
+
+        if (neigh->restarted) {
+                while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
+                        if (!rose_send_frame(skbn, neigh))
+                                kfree_skb(skbn);
+        }
+}
+
+/*
+ *      This routine is called when a Restart Request is needed
+ */
+static void rose_transmit_restart_request(struct rose_neigh *neigh)
+{
+        struct sk_buff *skb;
+        unsigned char *dptr;
+        int len;
+
+        len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
+
+        if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
+                return;
+
+        skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
+
+        dptr = skb_put(skb, ROSE_MIN_LEN + 3);
+
+        *dptr++ = AX25_P_ROSE;
+        *dptr++ = ROSE_GFI;
+        *dptr++ = 0x00;
+        *dptr++ = ROSE_RESTART_REQUEST;
+        *dptr++ = ROSE_DTE_ORIGINATED;
+        *dptr++ = 0;
+
+        if (!rose_send_frame(skb, neigh))
+                kfree_skb(skb);
+}
+
+/*
+ * This routine is called when a Restart Confirmation is needed
+ */
+static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
+{
+        struct sk_buff *skb;
+        unsigned char *dptr;
+        int len;
+
+        len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
+
+        if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
+                return;
+
+        skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
+
+        dptr = skb_put(skb, ROSE_MIN_LEN + 1);
+
+        *dptr++ = AX25_P_ROSE;
+        *dptr++ = ROSE_GFI;
+        *dptr++ = 0x00;
+        *dptr++ = ROSE_RESTART_CONFIRMATION;
+
+        if (!rose_send_frame(skb, neigh))
+                kfree_skb(skb);
+}
+
+/*
+ * This routine is called when a Clear Request is needed outside of the context
+ * of a connected socket.
+ */
+void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
+{
+        struct sk_buff *skb;
+        unsigned char *dptr;
+        int len;
+
+        len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
+
+        if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
+                return;
+
+        skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
+
+        dptr = skb_put(skb, ROSE_MIN_LEN + 3);
+
+        *dptr++ = AX25_P_ROSE;
+        *dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
+        *dptr++ = ((lci >> 0) & 0xFF);
+        *dptr++ = ROSE_CLEAR_REQUEST;
+        *dptr++ = cause;
+        *dptr++ = diagnostic;
+
+        if (!rose_send_frame(skb, neigh))
+                kfree_skb(skb);
+}
+
+void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
+{
+        unsigned char *dptr;
+
+#if 0
+        if (call_fw_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT) {
+                kfree_skb(skb);
+                return;
+        }
+#endif
+
+        if (neigh->loopback) {
+                rose_loopback_queue(skb, neigh);
+                return;
+        }
+
+        if (!rose_link_up(neigh))
+                neigh->restarted = 0;
+
+        dptr = skb_push(skb, 1);
+        *dptr++ = AX25_P_ROSE;
+
+        if (neigh->restarted) {
+                if (!rose_send_frame(skb, neigh))
+                        kfree_skb(skb);
+        } else {
+                skb_queue_tail(&neigh->queue, skb);
+
+                if (!rose_t0timer_running(neigh)) {
+                        rose_transmit_restart_request(neigh);
+                        neigh->dce_mode = 0;
+                        rose_start_t0timer(neigh);
+                }
+        }
+}