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linux-stable/net/rose/rose_subr.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

556 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>
static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose);
/*
* This routine purges all of the queues of frames.
*/
void rose_clear_queues(struct sock *sk)
{
skb_queue_purge(&sk->sk_write_queue);
skb_queue_purge(&rose_sk(sk)->ack_queue);
}
/*
* This routine purges the input queue of those frames that have been
* acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
* SDL diagram.
*/
void rose_frames_acked(struct sock *sk, unsigned short nr)
{
struct sk_buff *skb;
struct rose_sock *rose = rose_sk(sk);
/*
* Remove all the ack-ed frames from the ack queue.
*/
if (rose->va != nr) {
while (skb_peek(&rose->ack_queue) != NULL && rose->va != nr) {
skb = skb_dequeue(&rose->ack_queue);
kfree_skb(skb);
rose->va = (rose->va + 1) % ROSE_MODULUS;
}
}
}
void rose_requeue_frames(struct sock *sk)
{
struct sk_buff *skb, *skb_prev = NULL;
/*
* Requeue all the un-ack-ed frames on the output queue to be picked
* up by rose_kick. This arrangement handles the possibility of an
* empty output queue.
*/
while ((skb = skb_dequeue(&rose_sk(sk)->ack_queue)) != NULL) {
if (skb_prev == NULL)
skb_queue_head(&sk->sk_write_queue, skb);
else
skb_append(skb_prev, skb, &sk->sk_write_queue);
skb_prev = skb;
}
}
/*
* Validate that the value of nr is between va and vs. Return true or
* false for testing.
*/
int rose_validate_nr(struct sock *sk, unsigned short nr)
{
struct rose_sock *rose = rose_sk(sk);
unsigned short vc = rose->va;
while (vc != rose->vs) {
if (nr == vc) return 1;
vc = (vc + 1) % ROSE_MODULUS;
}
return nr == rose->vs;
}
/*
* This routine is called when the packet layer internally generates a
* control frame.
*/
void rose_write_internal(struct sock *sk, int frametype)
{
struct rose_sock *rose = rose_sk(sk);
struct sk_buff *skb;
unsigned char *dptr;
unsigned char lci1, lci2;
int maxfaclen = 0;
int len, faclen;
int reserve;
reserve = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1;
len = ROSE_MIN_LEN;
switch (frametype) {
case ROSE_CALL_REQUEST:
len += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN;
maxfaclen = 256;
break;
case ROSE_CALL_ACCEPTED:
case ROSE_CLEAR_REQUEST:
case ROSE_RESET_REQUEST:
len += 2;
break;
}
skb = alloc_skb(reserve + len + maxfaclen, GFP_ATOMIC);
if (!skb)
return;
/*
* Space for AX.25 header and PID.
*/
skb_reserve(skb, reserve);
dptr = skb_put(skb, len);
lci1 = (rose->lci >> 8) & 0x0F;
lci2 = (rose->lci >> 0) & 0xFF;
switch (frametype) {
case ROSE_CALL_REQUEST:
*dptr++ = ROSE_GFI | lci1;
*dptr++ = lci2;
*dptr++ = frametype;
*dptr++ = ROSE_CALL_REQ_ADDR_LEN_VAL;
memcpy(dptr, &rose->dest_addr, ROSE_ADDR_LEN);
dptr += ROSE_ADDR_LEN;
memcpy(dptr, &rose->source_addr, ROSE_ADDR_LEN);
dptr += ROSE_ADDR_LEN;
faclen = rose_create_facilities(dptr, rose);
skb_put(skb, faclen);
dptr += faclen;
break;
case ROSE_CALL_ACCEPTED:
*dptr++ = ROSE_GFI | lci1;
*dptr++ = lci2;
*dptr++ = frametype;
*dptr++ = 0x00; /* Address length */
*dptr++ = 0; /* Facilities length */
break;
case ROSE_CLEAR_REQUEST:
*dptr++ = ROSE_GFI | lci1;
*dptr++ = lci2;
*dptr++ = frametype;
*dptr++ = rose->cause;
*dptr++ = rose->diagnostic;
break;
case ROSE_RESET_REQUEST:
*dptr++ = ROSE_GFI | lci1;
*dptr++ = lci2;
*dptr++ = frametype;
*dptr++ = ROSE_DTE_ORIGINATED;
*dptr++ = 0;
break;
case ROSE_RR:
case ROSE_RNR:
*dptr++ = ROSE_GFI | lci1;
*dptr++ = lci2;
*dptr = frametype;
*dptr++ |= (rose->vr << 5) & 0xE0;
break;
case ROSE_CLEAR_CONFIRMATION:
case ROSE_RESET_CONFIRMATION:
*dptr++ = ROSE_GFI | lci1;
*dptr++ = lci2;
*dptr++ = frametype;
break;
default:
printk(KERN_ERR "ROSE: rose_write_internal - invalid frametype %02X\n", frametype);
kfree_skb(skb);
return;
}
rose_transmit_link(skb, rose->neighbour);
}
int rose_decode(struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m)
{
unsigned char *frame;
frame = skb->data;
*ns = *nr = *q = *d = *m = 0;
switch (frame[2]) {
case ROSE_CALL_REQUEST:
case ROSE_CALL_ACCEPTED:
case ROSE_CLEAR_REQUEST:
case ROSE_CLEAR_CONFIRMATION:
case ROSE_RESET_REQUEST:
case ROSE_RESET_CONFIRMATION:
return frame[2];
default:
break;
}
if ((frame[2] & 0x1F) == ROSE_RR ||
(frame[2] & 0x1F) == ROSE_RNR) {
*nr = (frame[2] >> 5) & 0x07;
return frame[2] & 0x1F;
}
if ((frame[2] & 0x01) == ROSE_DATA) {
*q = (frame[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
*d = (frame[0] & ROSE_D_BIT) == ROSE_D_BIT;
*m = (frame[2] & ROSE_M_BIT) == ROSE_M_BIT;
*nr = (frame[2] >> 5) & 0x07;
*ns = (frame[2] >> 1) & 0x07;
return ROSE_DATA;
}
return ROSE_ILLEGAL;
}
static int rose_parse_national(unsigned char *p, struct rose_facilities_struct *facilities, int len)
{
unsigned char *pt;
unsigned char l, lg, n = 0;
int fac_national_digis_received = 0;
do {
switch (*p & 0xC0) {
case 0x00:
if (len < 2)
return -1;
p += 2;
n += 2;
len -= 2;
break;
case 0x40:
if (len < 3)
return -1;
if (*p == FAC_NATIONAL_RAND)
facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
p += 3;
n += 3;
len -= 3;
break;
case 0x80:
if (len < 4)
return -1;
p += 4;
n += 4;
len -= 4;
break;
case 0xC0:
if (len < 2)
return -1;
l = p[1];
if (len < 2 + l)
return -1;
if (*p == FAC_NATIONAL_DEST_DIGI) {
if (!fac_national_digis_received) {
if (l < AX25_ADDR_LEN)
return -1;
memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN);
facilities->source_ndigis = 1;
}
}
else if (*p == FAC_NATIONAL_SRC_DIGI) {
if (!fac_national_digis_received) {
if (l < AX25_ADDR_LEN)
return -1;
memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN);
facilities->dest_ndigis = 1;
}
}
else if (*p == FAC_NATIONAL_FAIL_CALL) {
if (l < AX25_ADDR_LEN)
return -1;
memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN);
}
else if (*p == FAC_NATIONAL_FAIL_ADD) {
if (l < 1 + ROSE_ADDR_LEN)
return -1;
memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN);
}
else if (*p == FAC_NATIONAL_DIGIS) {
if (l % AX25_ADDR_LEN)
return -1;
fac_national_digis_received = 1;
facilities->source_ndigis = 0;
facilities->dest_ndigis = 0;
for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) {
if (pt[6] & AX25_HBIT) {
if (facilities->dest_ndigis >= ROSE_MAX_DIGIS)
return -1;
memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN);
} else {
if (facilities->source_ndigis >= ROSE_MAX_DIGIS)
return -1;
memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN);
}
}
}
p += l + 2;
n += l + 2;
len -= l + 2;
break;
}
} while (*p != 0x00 && len > 0);
return n;
}
static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len)
{
unsigned char l, n = 0;
char callsign[11];
do {
switch (*p & 0xC0) {
case 0x00:
if (len < 2)
return -1;
p += 2;
n += 2;
len -= 2;
break;
case 0x40:
if (len < 3)
return -1;
p += 3;
n += 3;
len -= 3;
break;
case 0x80:
if (len < 4)
return -1;
p += 4;
n += 4;
len -= 4;
break;
case 0xC0:
if (len < 2)
return -1;
l = p[1];
/* Prevent overflows*/
if (l < 10 || l > 20)
return -1;
if (*p == FAC_CCITT_DEST_NSAP) {
memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN);
memcpy(callsign, p + 12, l - 10);
callsign[l - 10] = '\0';
asc2ax(&facilities->source_call, callsign);
}
if (*p == FAC_CCITT_SRC_NSAP) {
memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN);
memcpy(callsign, p + 12, l - 10);
callsign[l - 10] = '\0';
asc2ax(&facilities->dest_call, callsign);
}
p += l + 2;
n += l + 2;
len -= l + 2;
break;
}
} while (*p != 0x00 && len > 0);
return n;
}
int rose_parse_facilities(unsigned char *p, unsigned packet_len,
struct rose_facilities_struct *facilities)
{
int facilities_len, len;
facilities_len = *p++;
if (facilities_len == 0 || (unsigned int)facilities_len > packet_len)
return 0;
while (facilities_len >= 3 && *p == 0x00) {
facilities_len--;
p++;
switch (*p) {
case FAC_NATIONAL: /* National */
len = rose_parse_national(p + 1, facilities, facilities_len - 1);
break;
case FAC_CCITT: /* CCITT */
len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1);
break;
default:
printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p);
len = 1;
break;
}
if (len < 0)
return 0;
if (WARN_ON(len >= facilities_len))
return 0;
facilities_len -= len + 1;
p += len + 1;
}
return facilities_len == 0;
}
static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
{
unsigned char *p = buffer + 1;
char *callsign;
char buf[11];
int len, nb;
/* National Facilities */
if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) {
*p++ = 0x00;
*p++ = FAC_NATIONAL;
if (rose->rand != 0) {
*p++ = FAC_NATIONAL_RAND;
*p++ = (rose->rand >> 8) & 0xFF;
*p++ = (rose->rand >> 0) & 0xFF;
}
/* Sent before older facilities */
if ((rose->source_ndigis > 0) || (rose->dest_ndigis > 0)) {
int maxdigi = 0;
*p++ = FAC_NATIONAL_DIGIS;
*p++ = AX25_ADDR_LEN * (rose->source_ndigis + rose->dest_ndigis);
for (nb = 0 ; nb < rose->source_ndigis ; nb++) {
if (++maxdigi >= ROSE_MAX_DIGIS)
break;
memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN);
p[6] |= AX25_HBIT;
p += AX25_ADDR_LEN;
}
for (nb = 0 ; nb < rose->dest_ndigis ; nb++) {
if (++maxdigi >= ROSE_MAX_DIGIS)
break;
memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN);
p[6] &= ~AX25_HBIT;
p += AX25_ADDR_LEN;
}
}
/* For compatibility */
if (rose->source_ndigis > 0) {
*p++ = FAC_NATIONAL_SRC_DIGI;
*p++ = AX25_ADDR_LEN;
memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN);
p += AX25_ADDR_LEN;
}
/* For compatibility */
if (rose->dest_ndigis > 0) {
*p++ = FAC_NATIONAL_DEST_DIGI;
*p++ = AX25_ADDR_LEN;
memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN);
p += AX25_ADDR_LEN;
}
}
*p++ = 0x00;
*p++ = FAC_CCITT;
*p++ = FAC_CCITT_DEST_NSAP;
callsign = ax2asc(buf, &rose->dest_call);
*p++ = strlen(callsign) + 10;
*p++ = (strlen(callsign) + 9) * 2; /* ??? */
*p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
*p++ = ROSE_ADDR_LEN * 2;
memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
p += ROSE_ADDR_LEN;
memcpy(p, callsign, strlen(callsign));
p += strlen(callsign);
*p++ = FAC_CCITT_SRC_NSAP;
callsign = ax2asc(buf, &rose->source_call);
*p++ = strlen(callsign) + 10;
*p++ = (strlen(callsign) + 9) * 2; /* ??? */
*p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
*p++ = ROSE_ADDR_LEN * 2;
memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
p += ROSE_ADDR_LEN;
memcpy(p, callsign, strlen(callsign));
p += strlen(callsign);
len = p - buffer;
buffer[0] = len - 1;
return len;
}
void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic)
{
struct rose_sock *rose = rose_sk(sk);
rose_stop_timer(sk);
rose_stop_idletimer(sk);
rose_clear_queues(sk);
rose->lci = 0;
rose->state = ROSE_STATE_0;
if (cause != -1)
rose->cause = cause;
if (diagnostic != -1)
rose->diagnostic = diagnostic;
sk->sk_state = TCP_CLOSE;
sk->sk_err = reason;
sk->sk_shutdown |= SEND_SHUTDOWN;
if (!sock_flag(sk, SOCK_DEAD)) {
sk->sk_state_change(sk);
sock_set_flag(sk, SOCK_DEAD);
}
}
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