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, 401 insertions, 0 deletions

diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c
new file mode 100644
index 000000000000..0a760fe66843
--- /dev/null
+++ b/net/x25/x25_link.c
@@ -0,0 +1,401 @@
+/*
+ *      X.25 Packet Layer release 002
+ *
+ *      This is ALPHA test software. This code may break your machine,
+ *      randomly fail to work with new releases, misbehave and/or generally
+ *      screw up. It might even work. 
+ *
+ *      This code REQUIRES 2.1.15 or higher
+ *
+ *      This module:
+ *              This module 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.
+ *
+ *      History
+ *      X.25 001        Jonathan Naylor   Started coding.
+ *      X.25 002        Jonathan Naylor   New timer architecture.
+ *      mar/20/00       Daniela Squassoni Disabling/enabling of facilities 
+ *                                        negotiation.
+ *      2000-09-04      Henner Eisen      dev_hold() / dev_put() for x25_neigh.
+ */
+
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <asm/uaccess.h>
+#include <linux/init.h>
+#include <net/x25.h>
+
+static struct list_head x25_neigh_list = LIST_HEAD_INIT(x25_neigh_list);
+static DEFINE_RWLOCK(x25_neigh_list_lock);
+
+static void x25_t20timer_expiry(unsigned long);
+
+static void x25_transmit_restart_confirmation(struct x25_neigh *nb);
+static void x25_transmit_restart_request(struct x25_neigh *nb);
+
+/*
+ *      Linux set/reset timer routines
+ */
+static inline void x25_start_t20timer(struct x25_neigh *nb)
+{
+        mod_timer(&nb->t20timer, jiffies + nb->t20);
+}
+
+static void x25_t20timer_expiry(unsigned long param)
+{
+        struct x25_neigh *nb = (struct x25_neigh *)param;
+
+        x25_transmit_restart_request(nb);
+
+        x25_start_t20timer(nb);
+}
+
+static inline void x25_stop_t20timer(struct x25_neigh *nb)
+{
+        del_timer(&nb->t20timer);
+}
+
+static inline int x25_t20timer_pending(struct x25_neigh *nb)
+{
+        return timer_pending(&nb->t20timer);
+}
+
+/*
+ *      This handles all restart and diagnostic frames.
+ */
+void x25_link_control(struct sk_buff *skb, struct x25_neigh *nb,
+                      unsigned short frametype)
+{
+        struct sk_buff *skbn;
+        int confirm;
+
+        switch (frametype) {
+                case X25_RESTART_REQUEST:
+                        confirm = !x25_t20timer_pending(nb);
+                        x25_stop_t20timer(nb);
+                        nb->state = X25_LINK_STATE_3;
+                        if (confirm)
+                                x25_transmit_restart_confirmation(nb);
+                        break;
+
+                case X25_RESTART_CONFIRMATION:
+                        x25_stop_t20timer(nb);
+                        nb->state = X25_LINK_STATE_3;
+                        break;
+
+                case X25_DIAGNOSTIC:
+                        printk(KERN_WARNING "x25: diagnostic #%d - "
+                               "%02X %02X %02X\n",
+                               skb->data[3], skb->data[4],
+                               skb->data[5], skb->data[6]);
+                        break;
+                        
+                default:
+                        printk(KERN_WARNING "x25: received unknown %02X "
+                               "with LCI 000\n", frametype);
+                        break;
+        }
+
+        if (nb->state == X25_LINK_STATE_3)
+                while ((skbn = skb_dequeue(&nb->queue)) != NULL)
+                        x25_send_frame(skbn, nb);
+}
+
+/*
+ *      This routine is called when a Restart Request is needed
+ */
+static void x25_transmit_restart_request(struct x25_neigh *nb)
+{
+        unsigned char *dptr;
+        int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
+        struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
+
+        if (!skb)
+                return;
+
+        skb_reserve(skb, X25_MAX_L2_LEN);
+
+        dptr = skb_put(skb, X25_STD_MIN_LEN + 2);
+
+        *dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
+        *dptr++ = 0x00;
+        *dptr++ = X25_RESTART_REQUEST;
+        *dptr++ = 0x00;
+        *dptr++ = 0;
+
+        skb->sk = NULL;
+
+        x25_send_frame(skb, nb);
+}
+
+/*
+ * This routine is called when a Restart Confirmation is needed
+ */
+static void x25_transmit_restart_confirmation(struct x25_neigh *nb)
+{
+        unsigned char *dptr;
+        int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN;
+        struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
+
+        if (!skb)
+                return;
+
+        skb_reserve(skb, X25_MAX_L2_LEN);
+
+        dptr = skb_put(skb, X25_STD_MIN_LEN);
+
+        *dptr++ = nb->extended ? X25_GFI_EXTSEQ : X25_GFI_STDSEQ;
+        *dptr++ = 0x00;
+        *dptr++ = X25_RESTART_CONFIRMATION;
+
+        skb->sk = NULL;
+
+        x25_send_frame(skb, nb);
+}
+
+/*
+ *      This routine is called when a Clear Request is needed outside of the context
+ *      of a connected socket.
+ */
+void x25_transmit_clear_request(struct x25_neigh *nb, unsigned int lci,
+                                unsigned char cause)
+{
+        unsigned char *dptr;
+        int len = X25_MAX_L2_LEN + X25_STD_MIN_LEN + 2;
+        struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
+
+        if (!skb)
+                return;
+
+        skb_reserve(skb, X25_MAX_L2_LEN);
+
+        dptr = skb_put(skb, X25_STD_MIN_LEN + 2);
+
+        *dptr++ = ((lci >> 8) & 0x0F) | (nb->extended ?
+                                         X25_GFI_EXTSEQ :
+                                         X25_GFI_STDSEQ);
+        *dptr++ = (lci >> 0) & 0xFF;
+        *dptr++ = X25_CLEAR_REQUEST;
+        *dptr++ = cause;
+        *dptr++ = 0x00;
+
+        skb->sk = NULL;
+
+        x25_send_frame(skb, nb);
+}
+
+void x25_transmit_link(struct sk_buff *skb, struct x25_neigh *nb)
+{
+        switch (nb->state) {
+                case X25_LINK_STATE_0:
+                        skb_queue_tail(&nb->queue, skb);
+                        nb->state = X25_LINK_STATE_1;
+                        x25_establish_link(nb);
+                        break;
+                case X25_LINK_STATE_1:
+                case X25_LINK_STATE_2:
+                        skb_queue_tail(&nb->queue, skb);
+                        break;
+                case X25_LINK_STATE_3:
+                        x25_send_frame(skb, nb);
+                        break;
+        }
+}
+
+/*
+ *      Called when the link layer has become established.
+ */
+void x25_link_established(struct x25_neigh *nb)
+{
+        switch (nb->state) {
+                case X25_LINK_STATE_0:
+                        nb->state = X25_LINK_STATE_2;
+                        break;
+                case X25_LINK_STATE_1:
+                        x25_transmit_restart_request(nb);
+                        nb->state = X25_LINK_STATE_2;
+                        x25_start_t20timer(nb);
+                        break;
+        }
+}
+
+/*
+ *      Called when the link layer has terminated, or an establishment
+ *      request has failed.
+ */
+
+void x25_link_terminated(struct x25_neigh *nb)
+{
+        nb->state = X25_LINK_STATE_0;
+        /* Out of order: clear existing virtual calls (X.25 03/93 4.6.3) */
+        x25_kill_by_neigh(nb);
+}
+
+/*
+ *      Add a new device.
+ */
+void x25_link_device_up(struct net_device *dev)
+{
+        struct x25_neigh *nb = kmalloc(sizeof(*nb), GFP_ATOMIC);
+
+        if (!nb)
+                return;
+
+        skb_queue_head_init(&nb->queue);
+
+        init_timer(&nb->t20timer);
+        nb->t20timer.data     = (unsigned long)nb;
+        nb->t20timer.function = &x25_t20timer_expiry;
+
+        dev_hold(dev);
+        nb->dev      = dev;
+        nb->state    = X25_LINK_STATE_0;
+        nb->extended = 0;
+        /*
+         * Enables negotiation
+         */
+        nb->global_facil_mask = X25_MASK_REVERSE |
+                                       X25_MASK_THROUGHPUT |
+                                       X25_MASK_PACKET_SIZE |
+                                       X25_MASK_WINDOW_SIZE;
+        nb->t20      = sysctl_x25_restart_request_timeout;
+        atomic_set(&nb->refcnt, 1);
+
+        write_lock_bh(&x25_neigh_list_lock);
+        list_add(&nb->node, &x25_neigh_list);
+        write_unlock_bh(&x25_neigh_list_lock);
+}
+
+/**
+ *      __x25_remove_neigh - remove neighbour from x25_neigh_list
+ *      @nb - neigh to remove
+ *
+ *      Remove neighbour from x25_neigh_list. If it was there.
+ *      Caller must hold x25_neigh_list_lock.
+ */
+static void __x25_remove_neigh(struct x25_neigh *nb)
+{
+        skb_queue_purge(&nb->queue);
+        x25_stop_t20timer(nb);
+
+        if (nb->node.next) {
+                list_del(&nb->node);
+                x25_neigh_put(nb);
+        }
+}
+
+/*
+ *      A device has been removed, remove its links.
+ */
+void x25_link_device_down(struct net_device *dev)
+{
+        struct x25_neigh *nb;
+        struct list_head *entry, *tmp;
+
+        write_lock_bh(&x25_neigh_list_lock);
+
+        list_for_each_safe(entry, tmp, &x25_neigh_list) {
+                nb = list_entry(entry, struct x25_neigh, node);
+
+                if (nb->dev == dev) {
+                        __x25_remove_neigh(nb);
+                        dev_put(dev);
+                }
+        }
+
+        write_unlock_bh(&x25_neigh_list_lock);
+}
+
+/*
+ *      Given a device, return the neighbour address.
+ */
+struct x25_neigh *x25_get_neigh(struct net_device *dev)
+{
+        struct x25_neigh *nb, *use = NULL;
+        struct list_head *entry;
+
+        read_lock_bh(&x25_neigh_list_lock);
+        list_for_each(entry, &x25_neigh_list) {
+                nb = list_entry(entry, struct x25_neigh, node);
+
+                if (nb->dev == dev) {
+                        use = nb;
+                        break;
+                }
+        }
+
+        if (use)
+                x25_neigh_hold(use);
+        read_unlock_bh(&x25_neigh_list_lock);
+        return use;
+}
+
+/*
+ *      Handle the ioctls that control the subscription functions.
+ */
+int x25_subscr_ioctl(unsigned int cmd, void __user *arg)
+{
+        struct x25_subscrip_struct x25_subscr;
+        struct x25_neigh *nb;
+        struct net_device *dev;
+        int rc = -EINVAL;
+
+        if (cmd != SIOCX25GSUBSCRIP && cmd != SIOCX25SSUBSCRIP)
+                goto out;
+
+        rc = -EFAULT;
+        if (copy_from_user(&x25_subscr, arg, sizeof(x25_subscr)))
+                goto out;
+
+        rc = -EINVAL;
+        if ((dev = x25_dev_get(x25_subscr.device)) == NULL)
+                goto out;
+
+        if ((nb = x25_get_neigh(dev)) == NULL)
+                goto out_dev_put;
+
+        dev_put(dev);
+
+        if (cmd == SIOCX25GSUBSCRIP) {
+                x25_subscr.extended          = nb->extended;
+                x25_subscr.global_facil_mask = nb->global_facil_mask;
+                rc = copy_to_user(arg, &x25_subscr,
+                                  sizeof(x25_subscr)) ? -EFAULT : 0;
+        } else {
+                rc = -EINVAL;
+                if (!(x25_subscr.extended && x25_subscr.extended != 1)) {
+                        rc = 0;
+                        nb->extended         = x25_subscr.extended;
+                        nb->global_facil_mask = x25_subscr.global_facil_mask;
+                }
+        }
+        x25_neigh_put(nb);
+out:
+        return rc;
+out_dev_put:
+        dev_put(dev);
+        goto out;
+}
+
+
+/*
+ *      Release all memory associated with X.25 neighbour structures.
+ */
+void __exit x25_link_free(void)
+{
+        struct x25_neigh *nb;
+        struct list_head *entry, *tmp;
+
+        write_lock_bh(&x25_neigh_list_lock);
+
+        list_for_each_safe(entry, tmp, &x25_neigh_list) {
+                nb = list_entry(entry, struct x25_neigh, node);
+                __x25_remove_neigh(nb);
+        }
+        write_unlock_bh(&x25_neigh_list_lock);
+}