Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / rose / rose_loopback.c

diff --git a/kernel/net/rose/rose_loopback.c b/kernel/net/rose/rose_loopback.c
new file mode 100644 (file)
index 0000000..3444562
--- /dev/null
+++ b/kernel/net/rose/rose_loopback.c
@@ -0,0 +1,124 @@
+/*
+ * 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/types.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+#include <linux/timer.h>
+#include <net/ax25.h>
+#include <linux/skbuff.h>
+#include <net/rose.h>
+#include <linux/init.h>
+
+static struct sk_buff_head loopback_queue;
+static struct timer_list loopback_timer;
+
+static void rose_set_loopback_timer(void);
+
+void rose_loopback_init(void)
+{
+       skb_queue_head_init(&loopback_queue);
+
+       init_timer(&loopback_timer);
+}
+
+static int rose_loopback_running(void)
+{
+       return timer_pending(&loopback_timer);
+}
+
+int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh)
+{
+       struct sk_buff *skbn;
+
+       skbn = skb_clone(skb, GFP_ATOMIC);
+
+       kfree_skb(skb);
+
+       if (skbn != NULL) {
+               skb_queue_tail(&loopback_queue, skbn);
+
+               if (!rose_loopback_running())
+                       rose_set_loopback_timer();
+       }
+
+       return 1;
+}
+
+static void rose_loopback_timer(unsigned long);
+
+static void rose_set_loopback_timer(void)
+{
+       del_timer(&loopback_timer);
+
+       loopback_timer.data     = 0;
+       loopback_timer.function = &rose_loopback_timer;
+       loopback_timer.expires  = jiffies + 10;
+
+       add_timer(&loopback_timer);
+}
+
+static void rose_loopback_timer(unsigned long param)
+{
+       struct sk_buff *skb;
+       struct net_device *dev;
+       rose_address *dest;
+       struct sock *sk;
+       unsigned short frametype;
+       unsigned int lci_i, lci_o;
+
+       while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
+               if (skb->len < ROSE_MIN_LEN) {
+                       kfree_skb(skb);
+                       continue;
+               }
+               lci_i     = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
+               frametype = skb->data[2];
+               if (frametype == ROSE_CALL_REQUEST &&
+                   (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
+                    skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
+                    ROSE_CALL_REQ_ADDR_LEN_VAL)) {
+                       kfree_skb(skb);
+                       continue;
+               }
+               dest      = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
+               lci_o     = ROSE_DEFAULT_MAXVC + 1 - lci_i;
+
+               skb_reset_transport_header(skb);
+
+               sk = rose_find_socket(lci_o, rose_loopback_neigh);
+               if (sk) {
+                       if (rose_process_rx_frame(sk, skb) == 0)
+                               kfree_skb(skb);
+                       continue;
+               }
+
+               if (frametype == ROSE_CALL_REQUEST) {
+                       if ((dev = rose_dev_get(dest)) != NULL) {
+                               if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0)
+                                       kfree_skb(skb);
+                       } else {
+                               kfree_skb(skb);
+                       }
+               } else {
+                       kfree_skb(skb);
+               }
+       }
+}
+
+void __exit rose_loopback_clear(void)
+{
+       struct sk_buff *skb;
+
+       del_timer(&loopback_timer);
+
+       while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
+               skb->sk = NULL;
+               kfree_skb(skb);
+       }
+}