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-rw-r--r--net/lapb/lapb_subr.c304
1 files changed, 0 insertions, 304 deletions
diff --git a/net/lapb/lapb_subr.c b/net/lapb/lapb_subr.c
deleted file mode 100644
index 75efde3e616c..000000000000
--- a/net/lapb/lapb_subr.c
+++ /dev/null
@@ -1,304 +0,0 @@
-/*
- * LAPB release 002
- *
- * This code REQUIRES 2.1.15 or higher/ NET3.038
- *
- * This module:
- * This module 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.
- *
- * History
- * LAPB 001 Jonathan Naylor Started Coding
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#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/inet.h>
-#include <linux/skbuff.h>
-#include <linux/slab.h>
-#include <net/sock.h>
-#include <linux/uaccess.h>
-#include <linux/fcntl.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <net/lapb.h>
-
-/*
- * This routine purges all the queues of frames.
- */
-void lapb_clear_queues(struct lapb_cb *lapb)
-{
- skb_queue_purge(&lapb->write_queue);
- skb_queue_purge(&lapb->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 lapb_frames_acked(struct lapb_cb *lapb, unsigned short nr)
-{
- struct sk_buff *skb;
- int modulus;
-
- modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
-
- /*
- * Remove all the ack-ed frames from the ack queue.
- */
- if (lapb->va != nr)
- while (skb_peek(&lapb->ack_queue) && lapb->va != nr) {
- skb = skb_dequeue(&lapb->ack_queue);
- kfree_skb(skb);
- lapb->va = (lapb->va + 1) % modulus;
- }
-}
-
-void lapb_requeue_frames(struct lapb_cb *lapb)
-{
- struct sk_buff *skb, *skb_prev = NULL;
-
- /*
- * Requeue all the un-ack-ed frames on the output queue to be picked
- * up by lapb_kick called from the timer. This arrangement handles the
- * possibility of an empty output queue.
- */
- while ((skb = skb_dequeue(&lapb->ack_queue)) != NULL) {
- if (!skb_prev)
- skb_queue_head(&lapb->write_queue, skb);
- else
- skb_append(skb_prev, skb, &lapb->write_queue);
- skb_prev = skb;
- }
-}
-
-/*
- * Validate that the value of nr is between va and vs. Return true or
- * false for testing.
- */
-int lapb_validate_nr(struct lapb_cb *lapb, unsigned short nr)
-{
- unsigned short vc = lapb->va;
- int modulus;
-
- modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
-
- while (vc != lapb->vs) {
- if (nr == vc)
- return 1;
- vc = (vc + 1) % modulus;
- }
-
- return nr == lapb->vs;
-}
-
-/*
- * This routine is the centralised routine for parsing the control
- * information for the different frame formats.
- */
-int lapb_decode(struct lapb_cb *lapb, struct sk_buff *skb,
- struct lapb_frame *frame)
-{
- frame->type = LAPB_ILLEGAL;
-
- lapb_dbg(2, "(%p) S%d RX %3ph\n", lapb->dev, lapb->state, skb->data);
-
- /* We always need to look at 2 bytes, sometimes we need
- * to look at 3 and those cases are handled below.
- */
- if (!pskb_may_pull(skb, 2))
- return -1;
-
- if (lapb->mode & LAPB_MLP) {
- if (lapb->mode & LAPB_DCE) {
- if (skb->data[0] == LAPB_ADDR_D)
- frame->cr = LAPB_COMMAND;
- if (skb->data[0] == LAPB_ADDR_C)
- frame->cr = LAPB_RESPONSE;
- } else {
- if (skb->data[0] == LAPB_ADDR_C)
- frame->cr = LAPB_COMMAND;
- if (skb->data[0] == LAPB_ADDR_D)
- frame->cr = LAPB_RESPONSE;
- }
- } else {
- if (lapb->mode & LAPB_DCE) {
- if (skb->data[0] == LAPB_ADDR_B)
- frame->cr = LAPB_COMMAND;
- if (skb->data[0] == LAPB_ADDR_A)
- frame->cr = LAPB_RESPONSE;
- } else {
- if (skb->data[0] == LAPB_ADDR_A)
- frame->cr = LAPB_COMMAND;
- if (skb->data[0] == LAPB_ADDR_B)
- frame->cr = LAPB_RESPONSE;
- }
- }
-
- skb_pull(skb, 1);
-
- if (lapb->mode & LAPB_EXTENDED) {
- if (!(skb->data[0] & LAPB_S)) {
- if (!pskb_may_pull(skb, 2))
- return -1;
- /*
- * I frame - carries NR/NS/PF
- */
- frame->type = LAPB_I;
- frame->ns = (skb->data[0] >> 1) & 0x7F;
- frame->nr = (skb->data[1] >> 1) & 0x7F;
- frame->pf = skb->data[1] & LAPB_EPF;
- frame->control[0] = skb->data[0];
- frame->control[1] = skb->data[1];
- skb_pull(skb, 2);
- } else if ((skb->data[0] & LAPB_U) == 1) {
- if (!pskb_may_pull(skb, 2))
- return -1;
- /*
- * S frame - take out PF/NR
- */
- frame->type = skb->data[0] & 0x0F;
- frame->nr = (skb->data[1] >> 1) & 0x7F;
- frame->pf = skb->data[1] & LAPB_EPF;
- frame->control[0] = skb->data[0];
- frame->control[1] = skb->data[1];
- skb_pull(skb, 2);
- } else if ((skb->data[0] & LAPB_U) == 3) {
- /*
- * U frame - take out PF
- */
- frame->type = skb->data[0] & ~LAPB_SPF;
- frame->pf = skb->data[0] & LAPB_SPF;
- frame->control[0] = skb->data[0];
- frame->control[1] = 0x00;
- skb_pull(skb, 1);
- }
- } else {
- if (!(skb->data[0] & LAPB_S)) {
- /*
- * I frame - carries NR/NS/PF
- */
- frame->type = LAPB_I;
- frame->ns = (skb->data[0] >> 1) & 0x07;
- frame->nr = (skb->data[0] >> 5) & 0x07;
- frame->pf = skb->data[0] & LAPB_SPF;
- } else if ((skb->data[0] & LAPB_U) == 1) {
- /*
- * S frame - take out PF/NR
- */
- frame->type = skb->data[0] & 0x0F;
- frame->nr = (skb->data[0] >> 5) & 0x07;
- frame->pf = skb->data[0] & LAPB_SPF;
- } else if ((skb->data[0] & LAPB_U) == 3) {
- /*
- * U frame - take out PF
- */
- frame->type = skb->data[0] & ~LAPB_SPF;
- frame->pf = skb->data[0] & LAPB_SPF;
- }
-
- frame->control[0] = skb->data[0];
-
- skb_pull(skb, 1);
- }
-
- return 0;
-}
-
-/*
- * This routine is called when the HDLC layer internally generates a
- * command or response for the remote machine ( eg. RR, UA etc. ).
- * Only supervisory or unnumbered frames are processed, FRMRs are handled
- * by lapb_transmit_frmr below.
- */
-void lapb_send_control(struct lapb_cb *lapb, int frametype,
- int poll_bit, int type)
-{
- struct sk_buff *skb;
- unsigned char *dptr;
-
- if ((skb = alloc_skb(LAPB_HEADER_LEN + 3, GFP_ATOMIC)) == NULL)
- return;
-
- skb_reserve(skb, LAPB_HEADER_LEN + 1);
-
- if (lapb->mode & LAPB_EXTENDED) {
- if ((frametype & LAPB_U) == LAPB_U) {
- dptr = skb_put(skb, 1);
- *dptr = frametype;
- *dptr |= poll_bit ? LAPB_SPF : 0;
- } else {
- dptr = skb_put(skb, 2);
- dptr[0] = frametype;
- dptr[1] = (lapb->vr << 1);
- dptr[1] |= poll_bit ? LAPB_EPF : 0;
- }
- } else {
- dptr = skb_put(skb, 1);
- *dptr = frametype;
- *dptr |= poll_bit ? LAPB_SPF : 0;
- if ((frametype & LAPB_U) == LAPB_S) /* S frames carry NR */
- *dptr |= (lapb->vr << 5);
- }
-
- lapb_transmit_buffer(lapb, skb, type);
-}
-
-/*
- * This routine generates FRMRs based on information previously stored in
- * the LAPB control block.
- */
-void lapb_transmit_frmr(struct lapb_cb *lapb)
-{
- struct sk_buff *skb;
- unsigned char *dptr;
-
- if ((skb = alloc_skb(LAPB_HEADER_LEN + 7, GFP_ATOMIC)) == NULL)
- return;
-
- skb_reserve(skb, LAPB_HEADER_LEN + 1);
-
- if (lapb->mode & LAPB_EXTENDED) {
- dptr = skb_put(skb, 6);
- *dptr++ = LAPB_FRMR;
- *dptr++ = lapb->frmr_data.control[0];
- *dptr++ = lapb->frmr_data.control[1];
- *dptr++ = (lapb->vs << 1) & 0xFE;
- *dptr = (lapb->vr << 1) & 0xFE;
- if (lapb->frmr_data.cr == LAPB_RESPONSE)
- *dptr |= 0x01;
- dptr++;
- *dptr++ = lapb->frmr_type;
-
- lapb_dbg(1, "(%p) S%d TX FRMR %5ph\n",
- lapb->dev, lapb->state,
- &skb->data[1]);
- } else {
- dptr = skb_put(skb, 4);
- *dptr++ = LAPB_FRMR;
- *dptr++ = lapb->frmr_data.control[0];
- *dptr = (lapb->vs << 1) & 0x0E;
- *dptr |= (lapb->vr << 5) & 0xE0;
- if (lapb->frmr_data.cr == LAPB_RESPONSE)
- *dptr |= 0x10;
- dptr++;
- *dptr++ = lapb->frmr_type;
-
- lapb_dbg(1, "(%p) S%d TX FRMR %3ph\n",
- lapb->dev, lapb->state, &skb->data[1]);
- }
-
- lapb_transmit_buffer(lapb, skb, LAPB_RESPONSE);
-}
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