LXR linux/net/netrom/nr

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *
   4 * Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi)
   5 */
   6#include <linux/types.h>
   7#include <linux/slab.h>
   8#include <linux/socket.h>
   9#include <linux/timer.h>
  10#include <net/ax25.h>
  11#include <linux/skbuff.h>
  12#include <net/netrom.h>
  13#include <linux/init.h>
  14
  15static void nr_loopback_timer(struct timer_list *);
  16
  17static struct sk_buff_head loopback_queue;
  18static DEFINE_TIMER(loopback_timer, nr_loopback_timer);
  19
  20void __init nr_loopback_init(void)
  21{
  22        skb_queue_head_init(&loopback_queue);
  23}
  24
  25static inline int nr_loopback_running(void)
  26{
  27        return timer_pending(&loopback_timer);
  28}
  29
  30int nr_loopback_queue(struct sk_buff *skb)
  31{
  32        struct sk_buff *skbn;
  33
  34        if ((skbn = alloc_skb(skb->len, GFP_ATOMIC)) != NULL) {
  35                skb_copy_from_linear_data(skb, skb_put(skbn, skb->len), skb->len);
  36                skb_reset_transport_header(skbn);
  37
  38                skb_queue_tail(&loopback_queue, skbn);
  39
  40                if (!nr_loopback_running())
  41                        mod_timer(&loopback_timer, jiffies + 10);
  42        }
  43
  44        kfree_skb(skb);
  45        return 1;
  46}
  47
  48static void nr_loopback_timer(struct timer_list *unused)
  49{
  50        struct sk_buff *skb;
  51        ax25_address *nr_dest;
  52        struct net_device *dev;
  53
  54        if ((skb = skb_dequeue(&loopback_queue)) != NULL) {
  55                nr_dest = (ax25_address *)(skb->data + 7);
  56
  57                dev = nr_dev_get(nr_dest);
  58
  59                if (dev == NULL || nr_rx_frame(skb, dev) == 0)
  60                        kfree_skb(skb);
  61
  62                if (dev != NULL)
  63                        dev_put(dev);
  64
  65                if (!skb_queue_empty(&loopback_queue) && !nr_loopback_running())
  66                        mod_timer(&loopback_timer, jiffies + 10);
  67        }
  68}
  69
  70void nr_loopback_clear(void)
  71{
  72        del_timer_sync(&loopback_timer);
  73        skb_queue_purge(&loopback_queue);
  74}
  75