2005-04-16 16:20:36 -06:00
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/*
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* X.25 Packet Layer release 002
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*
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* This is ALPHA test software. This code may break your machine,
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* randomly fail to work with new releases, misbehave and/or generally
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* screw up. It might even work.
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*
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* This code REQUIRES 2.1.15 or higher
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*
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* This module:
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* This module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* History
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* X.25 001 Jonathan Naylor Started coding.
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* X.25 002 Jonathan Naylor Centralised disconnection processing.
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* mar/20/00 Daniela Squassoni Disabling/enabling of facilities
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* negotiation.
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* jun/24/01 Arnaldo C. Melo use skb_queue_purge, cleanups
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[X25]: Fast select with no restriction on response
This patch is a follow up to patch 1 regarding "Selective Sub Address
matching with call user data". It allows use of the Fast-Select-Acceptance
optional user facility for X.25.
This patch just implements fast select with no restriction on response
(NRR). What this means (according to ITU-T Recomendation 10/96 section
6.16) is that if in an incoming call packet, the relevant facility bits are
set for fast-select-NRR, then the called DTE can issue a direct response to
the incoming packet using a call-accepted packet that contains
call-user-data. This patch allows such a response.
The called DTE can also respond with a clear-request packet that contains
call-user-data. However, this feature is currently not implemented by the
patch.
How is Fast Select Acceptance used?
By default, the system does not allow fast select acceptance (as before).
To enable a response to fast select acceptance,
After a listen socket in created and bound as follows
socket(AF_X25, SOCK_SEQPACKET, 0);
bind(call_soc, (struct sockaddr *)&locl_addr, sizeof(locl_addr));
but before a listen system call is made, the following ioctl should be used.
ioctl(call_soc,SIOCX25CALLACCPTAPPRV);
Now the listen system call can be made
listen(call_soc, 4);
After this, an incoming-call packet will be accepted, but no call-accepted
packet will be sent back until the following system call is made on the socket
that accepts the call
ioctl(vc_soc,SIOCX25SENDCALLACCPT);
The network (or cisco xot router used for testing here) will allow the
application server's call-user-data in the call-accepted packet,
provided the call-request was made with Fast-select NRR.
Signed-off-by: Shaun Pereira <spereira@tusc.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-22 23:16:17 -06:00
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* apr/04/15 Shaun Pereira Fast select with no
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* restriction on response.
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2005-04-16 16:20:36 -06:00
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*/
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2013-12-06 04:24:33 -07:00
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#define pr_fmt(fmt) "X25: " fmt
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
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#include <linux/slab.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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2005-08-09 21:08:28 -06:00
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#include <net/tcp_states.h>
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2005-04-16 16:20:36 -06:00
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#include <net/x25.h>
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/*
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* This routine purges all of the queues of frames.
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*/
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void x25_clear_queues(struct sock *sk)
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{
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struct x25_sock *x25 = x25_sk(sk);
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skb_queue_purge(&sk->sk_write_queue);
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skb_queue_purge(&x25->ack_queue);
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skb_queue_purge(&x25->interrupt_in_queue);
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skb_queue_purge(&x25->interrupt_out_queue);
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skb_queue_purge(&x25->fragment_queue);
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}
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/*
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* This routine purges the input queue of those frames that have been
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* acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
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* SDL diagram.
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*/
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void x25_frames_acked(struct sock *sk, unsigned short nr)
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{
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struct sk_buff *skb;
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struct x25_sock *x25 = x25_sk(sk);
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int modulus = x25->neighbour->extended ? X25_EMODULUS : X25_SMODULUS;
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/*
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* Remove all the ack-ed frames from the ack queue.
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*/
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if (x25->va != nr)
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while (skb_peek(&x25->ack_queue) && x25->va != nr) {
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skb = skb_dequeue(&x25->ack_queue);
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kfree_skb(skb);
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x25->va = (x25->va + 1) % modulus;
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}
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}
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void x25_requeue_frames(struct sock *sk)
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{
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struct sk_buff *skb, *skb_prev = NULL;
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/*
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* Requeue all the un-ack-ed frames on the output queue to be picked
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* up by x25_kick. This arrangement handles the possibility of an empty
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* output queue.
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*/
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while ((skb = skb_dequeue(&x25_sk(sk)->ack_queue)) != NULL) {
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if (!skb_prev)
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skb_queue_head(&sk->sk_write_queue, skb);
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else
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2005-08-09 20:25:21 -06:00
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skb_append(skb_prev, skb, &sk->sk_write_queue);
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2005-04-16 16:20:36 -06:00
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skb_prev = skb;
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}
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}
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/*
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* Validate that the value of nr is between va and vs. Return true or
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* false for testing.
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*/
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int x25_validate_nr(struct sock *sk, unsigned short nr)
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{
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struct x25_sock *x25 = x25_sk(sk);
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unsigned short vc = x25->va;
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int modulus = x25->neighbour->extended ? X25_EMODULUS : X25_SMODULUS;
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while (vc != x25->vs) {
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if (nr == vc)
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return 1;
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vc = (vc + 1) % modulus;
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}
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return nr == x25->vs ? 1 : 0;
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}
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/*
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* This routine is called when the packet layer internally generates a
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* control frame.
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*/
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void x25_write_internal(struct sock *sk, int frametype)
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{
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struct x25_sock *x25 = x25_sk(sk);
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struct sk_buff *skb;
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unsigned char *dptr;
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unsigned char facilities[X25_MAX_FAC_LEN];
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unsigned char addresses[1 + X25_ADDR_LEN];
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unsigned char lci1, lci2;
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/*
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* Default safe frame size.
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*/
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int len = X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
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/*
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* Adjust frame size.
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*/
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switch (frametype) {
|
2011-07-01 03:43:13 -06:00
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case X25_CALL_REQUEST:
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len += 1 + X25_ADDR_LEN + X25_MAX_FAC_LEN + X25_MAX_CUD_LEN;
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break;
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case X25_CALL_ACCEPTED: /* fast sel with no restr on resp */
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if (x25->facilities.reverse & 0x80) {
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len += 1 + X25_MAX_FAC_LEN + X25_MAX_CUD_LEN;
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} else {
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len += 1 + X25_MAX_FAC_LEN;
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}
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break;
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case X25_CLEAR_REQUEST:
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case X25_RESET_REQUEST:
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len += 2;
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break;
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case X25_RR:
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case X25_RNR:
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case X25_REJ:
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case X25_CLEAR_CONFIRMATION:
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case X25_INTERRUPT_CONFIRMATION:
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case X25_RESET_CONFIRMATION:
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break;
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default:
|
2013-12-06 04:24:33 -07:00
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pr_err("invalid frame type %02X\n", frametype);
|
2011-07-01 03:43:13 -06:00
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return;
|
2005-04-16 16:20:36 -06:00
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}
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if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
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return;
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/*
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* Space for Ethernet and 802.2 LLC headers.
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*/
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skb_reserve(skb, X25_MAX_L2_LEN);
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/*
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* Make space for the GFI and LCI, and fill them in.
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*/
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dptr = skb_put(skb, 2);
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lci1 = (x25->lci >> 8) & 0x0F;
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lci2 = (x25->lci >> 0) & 0xFF;
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if (x25->neighbour->extended) {
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*dptr++ = lci1 | X25_GFI_EXTSEQ;
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*dptr++ = lci2;
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} else {
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*dptr++ = lci1 | X25_GFI_STDSEQ;
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*dptr++ = lci2;
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}
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/*
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* Now fill in the frame type specific information.
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*/
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switch (frametype) {
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case X25_CALL_REQUEST:
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dptr = skb_put(skb, 1);
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*dptr++ = X25_CALL_REQUEST;
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len = x25_addr_aton(addresses, &x25->dest_addr,
|
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&x25->source_addr);
|
2017-06-18 08:52:04 -06:00
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skb_put_data(skb, addresses, len);
|
2005-04-16 16:20:36 -06:00
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len = x25_create_facilities(facilities,
|
[X25]: allow ITU-T DTE facilities for x25
Allows use of the optional user facility to insert ITU-T
(http://www.itu.int/ITU-T/) specified DTE facilities in call set-up x25
packets. This feature is optional; no facilities will be added if the ioctl
is not used, and call setup packet remains the same as before.
If the ioctls provided by the patch are used, then a facility marker will be
added to the x25 packet header so that the called dte address extension
facility can be differentiated from other types of facilities (as described in
the ITU-T X.25 recommendation) that are also allowed in the x25 packet header.
Facility markers are made up of two octets, and may be present in the x25
packet headers of call-request, incoming call, call accepted, clear request,
and clear indication packets. The first of the two octets represents the
facility code field and is set to zero by this patch. The second octet of the
marker represents the facility parameter field and is set to 0x0F because the
marker will be inserted before ITU-T type DTE facilities.
Since according to ITU-T X.25 Recommendation X.25(10/96)- 7.1 "All networks
will support the facility markers with a facility parameter field set to all
ones or to 00001111", therefore this patch should work with all x.25 networks.
While there are many ITU-T DTE facilities, this patch implements only the
called and calling address extension, with placeholders in the
x25_dte_facilities structure for the rest of the facilities.
Testing:
This patch was tested using a cisco xot router connected on its serial ports
to an X.25 network, and on its lan ports to a host running an xotd daemon.
It is also possible to test this patch using an xotd daemon and an x25tap
patch, where the xotd daemons work back-to-back without actually using an x.25
network. See www.fyonne.net for details on how to do this.
Signed-off-by: Shaun Pereira <spereira@tusc.com.au>
Acked-by: Andrew Hendry <ahendry@tusc.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-22 01:01:31 -07:00
|
|
|
&x25->facilities,
|
|
|
|
&x25->dte_facilities,
|
|
|
|
x25->neighbour->global_facil_mask);
|
2017-06-18 08:52:04 -06:00
|
|
|
skb_put_data(skb, facilities, len);
|
|
|
|
skb_put_data(skb, x25->calluserdata.cuddata,
|
|
|
|
x25->calluserdata.cudlength);
|
2005-04-16 16:20:36 -06:00
|
|
|
x25->calluserdata.cudlength = 0;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case X25_CALL_ACCEPTED:
|
|
|
|
dptr = skb_put(skb, 2);
|
|
|
|
*dptr++ = X25_CALL_ACCEPTED;
|
|
|
|
*dptr++ = 0x00; /* Address lengths */
|
|
|
|
len = x25_create_facilities(facilities,
|
|
|
|
&x25->facilities,
|
[X25]: allow ITU-T DTE facilities for x25
Allows use of the optional user facility to insert ITU-T
(http://www.itu.int/ITU-T/) specified DTE facilities in call set-up x25
packets. This feature is optional; no facilities will be added if the ioctl
is not used, and call setup packet remains the same as before.
If the ioctls provided by the patch are used, then a facility marker will be
added to the x25 packet header so that the called dte address extension
facility can be differentiated from other types of facilities (as described in
the ITU-T X.25 recommendation) that are also allowed in the x25 packet header.
Facility markers are made up of two octets, and may be present in the x25
packet headers of call-request, incoming call, call accepted, clear request,
and clear indication packets. The first of the two octets represents the
facility code field and is set to zero by this patch. The second octet of the
marker represents the facility parameter field and is set to 0x0F because the
marker will be inserted before ITU-T type DTE facilities.
Since according to ITU-T X.25 Recommendation X.25(10/96)- 7.1 "All networks
will support the facility markers with a facility parameter field set to all
ones or to 00001111", therefore this patch should work with all x.25 networks.
While there are many ITU-T DTE facilities, this patch implements only the
called and calling address extension, with placeholders in the
x25_dte_facilities structure for the rest of the facilities.
Testing:
This patch was tested using a cisco xot router connected on its serial ports
to an X.25 network, and on its lan ports to a host running an xotd daemon.
It is also possible to test this patch using an xotd daemon and an x25tap
patch, where the xotd daemons work back-to-back without actually using an x.25
network. See www.fyonne.net for details on how to do this.
Signed-off-by: Shaun Pereira <spereira@tusc.com.au>
Acked-by: Andrew Hendry <ahendry@tusc.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-22 01:01:31 -07:00
|
|
|
&x25->dte_facilities,
|
2005-04-16 16:20:36 -06:00
|
|
|
x25->vc_facil_mask);
|
2017-06-18 08:52:04 -06:00
|
|
|
skb_put_data(skb, facilities, len);
|
[X25]: Fast select with no restriction on response
This patch is a follow up to patch 1 regarding "Selective Sub Address
matching with call user data". It allows use of the Fast-Select-Acceptance
optional user facility for X.25.
This patch just implements fast select with no restriction on response
(NRR). What this means (according to ITU-T Recomendation 10/96 section
6.16) is that if in an incoming call packet, the relevant facility bits are
set for fast-select-NRR, then the called DTE can issue a direct response to
the incoming packet using a call-accepted packet that contains
call-user-data. This patch allows such a response.
The called DTE can also respond with a clear-request packet that contains
call-user-data. However, this feature is currently not implemented by the
patch.
How is Fast Select Acceptance used?
By default, the system does not allow fast select acceptance (as before).
To enable a response to fast select acceptance,
After a listen socket in created and bound as follows
socket(AF_X25, SOCK_SEQPACKET, 0);
bind(call_soc, (struct sockaddr *)&locl_addr, sizeof(locl_addr));
but before a listen system call is made, the following ioctl should be used.
ioctl(call_soc,SIOCX25CALLACCPTAPPRV);
Now the listen system call can be made
listen(call_soc, 4);
After this, an incoming-call packet will be accepted, but no call-accepted
packet will be sent back until the following system call is made on the socket
that accepts the call
ioctl(vc_soc,SIOCX25SENDCALLACCPT);
The network (or cisco xot router used for testing here) will allow the
application server's call-user-data in the call-accepted packet,
provided the call-request was made with Fast-select NRR.
Signed-off-by: Shaun Pereira <spereira@tusc.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-22 23:16:17 -06:00
|
|
|
|
|
|
|
/* fast select with no restriction on response
|
|
|
|
allows call user data. Userland must
|
|
|
|
ensure it is ours and not theirs */
|
|
|
|
if(x25->facilities.reverse & 0x80) {
|
2017-06-18 08:52:04 -06:00
|
|
|
skb_put_data(skb,
|
|
|
|
x25->calluserdata.cuddata,
|
|
|
|
x25->calluserdata.cudlength);
|
[X25]: Fast select with no restriction on response
This patch is a follow up to patch 1 regarding "Selective Sub Address
matching with call user data". It allows use of the Fast-Select-Acceptance
optional user facility for X.25.
This patch just implements fast select with no restriction on response
(NRR). What this means (according to ITU-T Recomendation 10/96 section
6.16) is that if in an incoming call packet, the relevant facility bits are
set for fast-select-NRR, then the called DTE can issue a direct response to
the incoming packet using a call-accepted packet that contains
call-user-data. This patch allows such a response.
The called DTE can also respond with a clear-request packet that contains
call-user-data. However, this feature is currently not implemented by the
patch.
How is Fast Select Acceptance used?
By default, the system does not allow fast select acceptance (as before).
To enable a response to fast select acceptance,
After a listen socket in created and bound as follows
socket(AF_X25, SOCK_SEQPACKET, 0);
bind(call_soc, (struct sockaddr *)&locl_addr, sizeof(locl_addr));
but before a listen system call is made, the following ioctl should be used.
ioctl(call_soc,SIOCX25CALLACCPTAPPRV);
Now the listen system call can be made
listen(call_soc, 4);
After this, an incoming-call packet will be accepted, but no call-accepted
packet will be sent back until the following system call is made on the socket
that accepts the call
ioctl(vc_soc,SIOCX25SENDCALLACCPT);
The network (or cisco xot router used for testing here) will allow the
application server's call-user-data in the call-accepted packet,
provided the call-request was made with Fast-select NRR.
Signed-off-by: Shaun Pereira <spereira@tusc.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-06-22 23:16:17 -06:00
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
x25->calluserdata.cudlength = 0;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case X25_CLEAR_REQUEST:
|
2009-11-19 00:30:41 -07:00
|
|
|
dptr = skb_put(skb, 3);
|
|
|
|
*dptr++ = frametype;
|
|
|
|
*dptr++ = x25->causediag.cause;
|
|
|
|
*dptr++ = x25->causediag.diagnostic;
|
|
|
|
break;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
case X25_RESET_REQUEST:
|
|
|
|
dptr = skb_put(skb, 3);
|
|
|
|
*dptr++ = frametype;
|
|
|
|
*dptr++ = 0x00; /* XXX */
|
|
|
|
*dptr++ = 0x00; /* XXX */
|
|
|
|
break;
|
|
|
|
|
|
|
|
case X25_RR:
|
|
|
|
case X25_RNR:
|
|
|
|
case X25_REJ:
|
|
|
|
if (x25->neighbour->extended) {
|
|
|
|
dptr = skb_put(skb, 2);
|
|
|
|
*dptr++ = frametype;
|
|
|
|
*dptr++ = (x25->vr << 1) & 0xFE;
|
|
|
|
} else {
|
|
|
|
dptr = skb_put(skb, 1);
|
|
|
|
*dptr = frametype;
|
|
|
|
*dptr++ |= (x25->vr << 5) & 0xE0;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case X25_CLEAR_CONFIRMATION:
|
|
|
|
case X25_INTERRUPT_CONFIRMATION:
|
|
|
|
case X25_RESET_CONFIRMATION:
|
|
|
|
dptr = skb_put(skb, 1);
|
|
|
|
*dptr = frametype;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
x25_transmit_link(skb, x25->neighbour);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Unpick the contents of the passed X.25 Packet Layer frame.
|
|
|
|
*/
|
|
|
|
int x25_decode(struct sock *sk, struct sk_buff *skb, int *ns, int *nr, int *q,
|
|
|
|
int *d, int *m)
|
|
|
|
{
|
|
|
|
struct x25_sock *x25 = x25_sk(sk);
|
2011-10-14 12:45:04 -06:00
|
|
|
unsigned char *frame;
|
|
|
|
|
|
|
|
if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
|
|
|
|
return X25_ILLEGAL;
|
|
|
|
frame = skb->data;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
*ns = *nr = *q = *d = *m = 0;
|
|
|
|
|
|
|
|
switch (frame[2]) {
|
2011-07-01 03:43:13 -06:00
|
|
|
case X25_CALL_REQUEST:
|
|
|
|
case X25_CALL_ACCEPTED:
|
|
|
|
case X25_CLEAR_REQUEST:
|
|
|
|
case X25_CLEAR_CONFIRMATION:
|
|
|
|
case X25_INTERRUPT:
|
|
|
|
case X25_INTERRUPT_CONFIRMATION:
|
|
|
|
case X25_RESET_REQUEST:
|
|
|
|
case X25_RESET_CONFIRMATION:
|
|
|
|
case X25_RESTART_REQUEST:
|
|
|
|
case X25_RESTART_CONFIRMATION:
|
|
|
|
case X25_REGISTRATION_REQUEST:
|
|
|
|
case X25_REGISTRATION_CONFIRMATION:
|
|
|
|
case X25_DIAGNOSTIC:
|
|
|
|
return frame[2];
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
if (x25->neighbour->extended) {
|
|
|
|
if (frame[2] == X25_RR ||
|
|
|
|
frame[2] == X25_RNR ||
|
|
|
|
frame[2] == X25_REJ) {
|
2011-10-14 12:45:04 -06:00
|
|
|
if (!pskb_may_pull(skb, X25_EXT_MIN_LEN))
|
|
|
|
return X25_ILLEGAL;
|
|
|
|
frame = skb->data;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
*nr = (frame[3] >> 1) & 0x7F;
|
|
|
|
return frame[2];
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if ((frame[2] & 0x1F) == X25_RR ||
|
|
|
|
(frame[2] & 0x1F) == X25_RNR ||
|
|
|
|
(frame[2] & 0x1F) == X25_REJ) {
|
|
|
|
*nr = (frame[2] >> 5) & 0x07;
|
|
|
|
return frame[2] & 0x1F;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (x25->neighbour->extended) {
|
|
|
|
if ((frame[2] & 0x01) == X25_DATA) {
|
2011-10-14 12:45:04 -06:00
|
|
|
if (!pskb_may_pull(skb, X25_EXT_MIN_LEN))
|
|
|
|
return X25_ILLEGAL;
|
|
|
|
frame = skb->data;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
*q = (frame[0] & X25_Q_BIT) == X25_Q_BIT;
|
|
|
|
*d = (frame[0] & X25_D_BIT) == X25_D_BIT;
|
|
|
|
*m = (frame[3] & X25_EXT_M_BIT) == X25_EXT_M_BIT;
|
|
|
|
*nr = (frame[3] >> 1) & 0x7F;
|
|
|
|
*ns = (frame[2] >> 1) & 0x7F;
|
|
|
|
return X25_DATA;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if ((frame[2] & 0x01) == X25_DATA) {
|
|
|
|
*q = (frame[0] & X25_Q_BIT) == X25_Q_BIT;
|
|
|
|
*d = (frame[0] & X25_D_BIT) == X25_D_BIT;
|
|
|
|
*m = (frame[2] & X25_STD_M_BIT) == X25_STD_M_BIT;
|
|
|
|
*nr = (frame[2] >> 5) & 0x07;
|
|
|
|
*ns = (frame[2] >> 1) & 0x07;
|
|
|
|
return X25_DATA;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-02-19 04:37:15 -07:00
|
|
|
pr_debug("invalid PLP frame %3ph\n", frame);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
return X25_ILLEGAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
void x25_disconnect(struct sock *sk, int reason, unsigned char cause,
|
|
|
|
unsigned char diagnostic)
|
|
|
|
{
|
|
|
|
struct x25_sock *x25 = x25_sk(sk);
|
|
|
|
|
|
|
|
x25_clear_queues(sk);
|
|
|
|
x25_stop_timer(sk);
|
|
|
|
|
|
|
|
x25->lci = 0;
|
|
|
|
x25->state = X25_STATE_0;
|
|
|
|
|
|
|
|
x25->causediag.cause = cause;
|
|
|
|
x25->causediag.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);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Clear an own-rx-busy condition and tell the peer about this, provided
|
|
|
|
* that there is a significant amount of free receive buffer space available.
|
|
|
|
*/
|
|
|
|
void x25_check_rbuf(struct sock *sk)
|
|
|
|
{
|
|
|
|
struct x25_sock *x25 = x25_sk(sk);
|
|
|
|
|
2008-01-13 23:27:52 -07:00
|
|
|
if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf >> 1) &&
|
2005-04-16 16:20:36 -06:00
|
|
|
(x25->condition & X25_COND_OWN_RX_BUSY)) {
|
|
|
|
x25->condition &= ~X25_COND_OWN_RX_BUSY;
|
|
|
|
x25->condition &= ~X25_COND_ACK_PENDING;
|
|
|
|
x25->vl = x25->vr;
|
|
|
|
x25_write_internal(sk, X25_RR);
|
|
|
|
x25_stop_timer(sk);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|