mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 11:30:53 +07:00
e0bccd315d
Define some constant offsets for CALL_REQUEST based on the description at <http://www.techfest.com/networking/wan/x25plp.htm> and the definition of ROSE as using 10-digit (5-byte) addresses. Use them consistently. Validate all implicit and explicit facilities lengths. Validate the address length byte rather than either trusting or assuming its value. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
/*
|
|
* 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);
|
|
}
|
|
}
|