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132 lines
2.8 KiB
132 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Copyright (C) Jonathan Naylor G4KLX ([email protected]) |
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*/ |
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#include <linux/types.h> |
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#include <linux/slab.h> |
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#include <linux/socket.h> |
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#include <linux/timer.h> |
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#include <net/ax25.h> |
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#include <linux/skbuff.h> |
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#include <net/rose.h> |
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#include <linux/init.h> |
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static struct sk_buff_head loopback_queue; |
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#define ROSE_LOOPBACK_LIMIT 1000 |
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static struct timer_list loopback_timer; |
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static void rose_set_loopback_timer(void); |
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static void rose_loopback_timer(struct timer_list *unused); |
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void rose_loopback_init(void) |
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{ |
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skb_queue_head_init(&loopback_queue); |
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timer_setup(&loopback_timer, rose_loopback_timer, 0); |
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} |
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static int rose_loopback_running(void) |
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{ |
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return timer_pending(&loopback_timer); |
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} |
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int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh) |
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{ |
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struct sk_buff *skbn = NULL; |
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if (skb_queue_len(&loopback_queue) < ROSE_LOOPBACK_LIMIT) |
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skbn = skb_clone(skb, GFP_ATOMIC); |
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if (skbn) { |
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consume_skb(skb); |
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skb_queue_tail(&loopback_queue, skbn); |
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if (!rose_loopback_running()) |
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rose_set_loopback_timer(); |
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} else { |
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kfree_skb(skb); |
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} |
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return 1; |
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} |
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static void rose_set_loopback_timer(void) |
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{ |
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mod_timer(&loopback_timer, jiffies + 10); |
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} |
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static void rose_loopback_timer(struct timer_list *unused) |
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{ |
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struct sk_buff *skb; |
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struct net_device *dev; |
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rose_address *dest; |
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struct sock *sk; |
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unsigned short frametype; |
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unsigned int lci_i, lci_o; |
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int count; |
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for (count = 0; count < ROSE_LOOPBACK_LIMIT; count++) { |
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skb = skb_dequeue(&loopback_queue); |
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if (!skb) |
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return; |
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if (skb->len < ROSE_MIN_LEN) { |
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kfree_skb(skb); |
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continue; |
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} |
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lci_i = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); |
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frametype = skb->data[2]; |
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if (frametype == ROSE_CALL_REQUEST && |
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(skb->len <= ROSE_CALL_REQ_FACILITIES_OFF || |
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skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] != |
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ROSE_CALL_REQ_ADDR_LEN_VAL)) { |
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kfree_skb(skb); |
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continue; |
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} |
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dest = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF); |
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lci_o = ROSE_DEFAULT_MAXVC + 1 - lci_i; |
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skb_reset_transport_header(skb); |
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sk = rose_find_socket(lci_o, rose_loopback_neigh); |
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if (sk) { |
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if (rose_process_rx_frame(sk, skb) == 0) |
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kfree_skb(skb); |
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continue; |
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} |
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if (frametype == ROSE_CALL_REQUEST) { |
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if (!rose_loopback_neigh->dev) { |
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kfree_skb(skb); |
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continue; |
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} |
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dev = rose_dev_get(dest); |
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if (!dev) { |
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kfree_skb(skb); |
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continue; |
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} |
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if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0) { |
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dev_put(dev); |
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kfree_skb(skb); |
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} |
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} else { |
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kfree_skb(skb); |
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} |
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} |
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if (!skb_queue_empty(&loopback_queue)) |
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mod_timer(&loopback_timer, jiffies + 1); |
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} |
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void __exit rose_loopback_clear(void) |
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{ |
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struct sk_buff *skb; |
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del_timer(&loopback_timer); |
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while ((skb = skb_dequeue(&loopback_queue)) != NULL) { |
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skb->sk = NULL; |
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kfree_skb(skb); |
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} |
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}
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