589f6ed8ce
format version number. (userland programs should not need to be recompiled when the netgraph kernel internal ABI is changed. Also fix modules that don;t handle the fact that a caller may not supply a return message pointer. (benign at the moment because the calling code checks, but that will change)
1099 lines
28 KiB
C
1099 lines
28 KiB
C
|
|
/*
|
|
* ng_lmi.c
|
|
*
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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|
*
|
|
* Subject to the following obligations and disclaimer of warranty, use and
|
|
* redistribution of this software, in source or object code forms, with or
|
|
* without modifications are expressly permitted by Whistle Communications;
|
|
* provided, however, that:
|
|
* 1. Any and all reproductions of the source or object code must include the
|
|
* copyright notice above and the following disclaimer of warranties; and
|
|
* 2. No rights are granted, in any manner or form, to use Whistle
|
|
* Communications, Inc. trademarks, including the mark "WHISTLE
|
|
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
|
|
* such appears in the above copyright notice or in the software.
|
|
*
|
|
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
|
|
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
|
|
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
|
|
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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|
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
|
|
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
|
|
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
|
|
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
|
|
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
|
|
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
|
|
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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|
* OF SUCH DAMAGE.
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*
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* Author: Julian Elischer <julian@freebsd.org>
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*
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* $FreeBSD$
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* $Whistle: ng_lmi.c,v 1.38 1999/11/01 09:24:52 julian Exp $
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*/
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/*
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* This node performs the frame relay LMI protocol. It knows how
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* to do ITU Annex A, ANSI Annex D, and "Group-of-Four" variants
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* of the protocol.
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*
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* A specific protocol can be forced by connecting the corresponding
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* hook to DLCI 0 or 1023 (as appropriate) of a frame relay link.
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*
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* Alternately, this node can do auto-detection of the LMI protocol
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* by connecting hook "auto0" to DLCI 0 and "auto1023" to DLCI 1023.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/syslog.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_lmi.h>
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/*
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* Human readable names for LMI
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*/
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#define NAME_ANNEXA NG_LMI_HOOK_ANNEXA
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#define NAME_ANNEXD NG_LMI_HOOK_ANNEXD
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#define NAME_GROUP4 NG_LMI_HOOK_GROUPOF4
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#define NAME_NONE "None"
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#define MAX_DLCIS 128
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#define MAXDLCI 1023
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/*
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* DLCI states
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*/
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#define DLCI_NULL 0
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#define DLCI_UP 1
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#define DLCI_DOWN 2
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/*
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* Any received LMI frame should be at least this long
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*/
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#define LMI_MIN_LENGTH 8 /* XXX verify */
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/*
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* Netgraph node methods and type descriptor
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*/
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static ng_constructor_t nglmi_constructor;
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static ng_rcvmsg_t nglmi_rcvmsg;
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static ng_shutdown_t nglmi_rmnode;
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static ng_newhook_t nglmi_newhook;
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static ng_rcvdata_t nglmi_rcvdata;
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static ng_disconnect_t nglmi_disconnect;
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static int nglmi_checkdata(hook_p hook, struct mbuf *m, meta_p meta);
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static struct ng_type typestruct = {
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NG_ABI_VERSION,
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NG_LMI_NODE_TYPE,
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NULL,
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nglmi_constructor,
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nglmi_rcvmsg,
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nglmi_rmnode,
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nglmi_newhook,
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NULL,
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NULL,
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nglmi_rcvdata,
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nglmi_disconnect,
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NULL
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};
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NETGRAPH_INIT(lmi, &typestruct);
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|
/*
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|
* Info and status per node
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|
*/
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struct nglmi_softc {
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node_p node; /* netgraph node */
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int flags; /* state */
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int poll_count; /* the count of times for autolmi */
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int poll_state; /* state of auto detect machine */
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u_char remote_seq; /* sequence number the remote sent */
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u_char local_seq; /* last sequence number we sent */
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u_char protoID; /* 9 for group of 4, 8 otherwise */
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u_long seq_retries; /* sent this how many time so far */
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struct callout_handle handle; /* see timeout(9) */
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int liv_per_full;
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int liv_rate;
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int livs;
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|
int need_full;
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hook_p lmi_channel; /* whatever we ended up using */
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hook_p lmi_annexA;
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hook_p lmi_annexD;
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hook_p lmi_group4;
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hook_p lmi_channel0; /* auto-detect on DLCI 0 */
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hook_p lmi_channel1023;/* auto-detect on DLCI 1023 */
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char *protoname; /* cache protocol name */
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u_char dlci_state[MAXDLCI + 1];
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int invalidx; /* next dlci's to invalidate */
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};
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typedef struct nglmi_softc *sc_p;
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/*
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|
* Other internal functions
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|
*/
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static void LMI_ticker(void *arg);
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static void nglmi_startup_fixed(sc_p sc, hook_p hook);
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static void nglmi_startup_auto(sc_p sc);
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static void nglmi_startup(sc_p sc);
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static void nglmi_inquire(sc_p sc, int full);
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static void ngauto_state_machine(sc_p sc);
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|
/*
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* Values for 'flags' field
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* NB: the SCF_CONNECTED flag is set if and only if the timer is running.
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*/
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#define SCF_CONNECTED 0x01 /* connected to something */
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#define SCF_AUTO 0x02 /* we are auto-detecting */
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#define SCF_FIXED 0x04 /* we are fixed from the start */
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#define SCF_LMITYPE 0x18 /* mask for determining Annex mode */
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#define SCF_NOLMI 0x00 /* no LMI type selected yet */
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#define SCF_ANNEX_A 0x08 /* running annex A mode */
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#define SCF_ANNEX_D 0x10 /* running annex D mode */
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#define SCF_GROUP4 0x18 /* running group of 4 */
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#define SETLMITYPE(sc, annex) \
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do { \
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(sc)->flags &= ~SCF_LMITYPE; \
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(sc)->flags |= (annex); \
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} while (0)
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#define NOPROTO(sc) (((sc)->flags & SCF_LMITYPE) == SCF_NOLMI)
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#define ANNEXA(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_A)
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#define ANNEXD(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_D)
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#define GROUP4(sc) (((sc)->flags & SCF_LMITYPE) == SCF_GROUP4)
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#define LMIPOLLSIZE 3
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#define LMI_PATIENCE 8 /* declare all DLCI DOWN after N LMI failures */
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|
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|
/*
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|
* Node constructor
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|
*/
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static int
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nglmi_constructor(node_p *nodep)
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|
{
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|
sc_p sc;
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int error = 0;
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MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (sc == NULL)
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return (ENOMEM);
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callout_handle_init(&sc->handle);
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if ((error = ng_make_node_common(&typestruct, nodep))) {
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|
FREE(sc, M_NETGRAPH);
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|
return (error);
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|
}
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(*nodep)->private = sc;
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sc->protoname = NAME_NONE;
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sc->node = *nodep;
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sc->liv_per_full = NG_LMI_SEQ_PER_FULL; /* make this dynamic */
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sc->liv_rate = NG_LMI_KEEPALIVE_RATE;
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return (0);
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}
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/*
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* The LMI channel has a private pointer which is the same as the
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* node private pointer. The debug channel has a NULL private pointer.
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*/
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static int
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nglmi_newhook(node_p node, hook_p hook, const char *name)
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{
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sc_p sc = node->private;
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if (strcmp(name, NG_LMI_HOOK_DEBUG) == 0) {
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hook->private = NULL;
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return (0);
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}
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if (sc->flags & SCF_CONNECTED) {
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/* already connected, return an error */
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return (EINVAL);
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|
}
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if (strcmp(name, NG_LMI_HOOK_ANNEXA) == 0) {
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sc->lmi_annexA = hook;
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hook->private = node->private;
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sc->protoID = 8;
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SETLMITYPE(sc, SCF_ANNEX_A);
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sc->protoname = NAME_ANNEXA;
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nglmi_startup_fixed(sc, hook);
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} else if (strcmp(name, NG_LMI_HOOK_ANNEXD) == 0) {
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sc->lmi_annexD = hook;
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hook->private = node->private;
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sc->protoID = 8;
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SETLMITYPE(sc, SCF_ANNEX_D);
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sc->protoname = NAME_ANNEXD;
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nglmi_startup_fixed(sc, hook);
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} else if (strcmp(name, NG_LMI_HOOK_GROUPOF4) == 0) {
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sc->lmi_group4 = hook;
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hook->private = node->private;
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sc->protoID = 9;
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SETLMITYPE(sc, SCF_GROUP4);
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sc->protoname = NAME_GROUP4;
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nglmi_startup_fixed(sc, hook);
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} else if (strcmp(name, NG_LMI_HOOK_AUTO0) == 0) {
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/* Note this, and if B is already installed, we're complete */
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sc->lmi_channel0 = hook;
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sc->protoname = NAME_NONE;
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hook->private = node->private;
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if (sc->lmi_channel1023)
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nglmi_startup_auto(sc);
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} else if (strcmp(name, NG_LMI_HOOK_AUTO1023) == 0) {
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/* Note this, and if A is already installed, we're complete */
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sc->lmi_channel1023 = hook;
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sc->protoname = NAME_NONE;
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hook->private = node->private;
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if (sc->lmi_channel0)
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nglmi_startup_auto(sc);
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} else
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return (EINVAL); /* unknown hook */
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return (0);
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}
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|
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/*
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* We have just attached to a live (we hope) node.
|
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* Fire out a LMI inquiry, and then start up the timers.
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*/
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static void
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LMI_ticker(void *arg)
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{
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sc_p sc = arg;
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int s = splnet();
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if (sc->flags & SCF_AUTO) {
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ngauto_state_machine(sc);
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sc->handle = timeout(LMI_ticker, sc, NG_LMI_POLL_RATE * hz);
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} else {
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if (sc->livs++ >= sc->liv_per_full) {
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nglmi_inquire(sc, 1);
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/* sc->livs = 0; *//* do this when we get the answer! */
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} else {
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nglmi_inquire(sc, 0);
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}
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sc->handle = timeout(LMI_ticker, sc, sc->liv_rate * hz);
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}
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splx(s);
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|
}
|
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|
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static void
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nglmi_startup_fixed(sc_p sc, hook_p hook)
|
|
{
|
|
sc->flags |= (SCF_FIXED | SCF_CONNECTED);
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sc->lmi_channel = hook;
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nglmi_startup(sc);
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}
|
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|
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static void
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nglmi_startup_auto(sc_p sc)
|
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{
|
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sc->flags |= (SCF_AUTO | SCF_CONNECTED);
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sc->poll_state = 0; /* reset state machine */
|
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sc->poll_count = 0;
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nglmi_startup(sc);
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}
|
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|
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static void
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nglmi_startup(sc_p sc)
|
|
{
|
|
sc->remote_seq = 0;
|
|
sc->local_seq = 1;
|
|
sc->seq_retries = 0;
|
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sc->livs = sc->liv_per_full - 1;
|
|
/* start off the ticker in 1 sec */
|
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sc->handle = timeout(LMI_ticker, sc, hz);
|
|
}
|
|
|
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#define META_PAD 16
|
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static void
|
|
nglmi_inquire(sc_p sc, int full)
|
|
{
|
|
struct mbuf *m;
|
|
char *cptr, *start;
|
|
int error;
|
|
meta_p meta = NULL;
|
|
|
|
if (sc->lmi_channel == NULL)
|
|
return;
|
|
MGETHDR(m, M_DONTWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
log(LOG_ERR, "nglmi: unable to start up LMI processing\n");
|
|
return;
|
|
}
|
|
m->m_pkthdr.rcvif = NULL;
|
|
/* Allocate a meta struct (and leave some slop for options to be
|
|
* added by other modules). */
|
|
/* MALLOC(meta, meta_p, sizeof( struct ng_meta) + META_PAD,
|
|
* M_NETGRAPH, M_NOWAIT); */
|
|
MALLOC(meta, meta_p, sizeof(*meta) + META_PAD, M_NETGRAPH, M_NOWAIT);
|
|
if (meta != NULL) { /* if it failed, well, it was optional anyhow */
|
|
meta->used_len = (u_short) sizeof(struct ng_meta);
|
|
meta->allocated_len
|
|
= (u_short) sizeof(struct ng_meta) + META_PAD;
|
|
meta->flags = 0;
|
|
meta->priority = NG_LMI_LMI_PRIORITY;
|
|
meta->discardability = -1;
|
|
}
|
|
m->m_data += 4; /* leave some room for a header */
|
|
cptr = start = mtod(m, char *);
|
|
/* add in the header for an LMI inquiry. */
|
|
*cptr++ = 0x03; /* UI frame */
|
|
if (GROUP4(sc))
|
|
*cptr++ = 0x09; /* proto discriminator */
|
|
else
|
|
*cptr++ = 0x08; /* proto discriminator */
|
|
*cptr++ = 0x00; /* call reference */
|
|
*cptr++ = 0x75; /* inquiry */
|
|
|
|
/* If we are Annex-D, there is this extra thing.. */
|
|
if (ANNEXD(sc))
|
|
*cptr++ = 0x95; /* ??? */
|
|
/* Add a request type */
|
|
if (ANNEXA(sc))
|
|
*cptr++ = 0x51; /* report type */
|
|
else
|
|
*cptr++ = 0x01; /* report type */
|
|
*cptr++ = 0x01; /* size = 1 */
|
|
if (full)
|
|
*cptr++ = 0x00; /* full */
|
|
else
|
|
*cptr++ = 0x01; /* partial */
|
|
|
|
/* Add a link verification IE */
|
|
if (ANNEXA(sc))
|
|
*cptr++ = 0x53; /* verification IE */
|
|
else
|
|
*cptr++ = 0x03; /* verification IE */
|
|
*cptr++ = 0x02; /* 2 extra bytes */
|
|
*cptr++ = sc->local_seq;
|
|
*cptr++ = sc->remote_seq;
|
|
sc->seq_retries++;
|
|
|
|
/* Send it */
|
|
m->m_len = m->m_pkthdr.len = cptr - start;
|
|
NG_SEND_DATA(error, sc->lmi_channel, m, meta);
|
|
|
|
/* If we've been sending requests for long enough, and there has
|
|
* been no response, then mark as DOWN, any DLCIs that are UP. */
|
|
if (sc->seq_retries == LMI_PATIENCE) {
|
|
int count;
|
|
|
|
for (count = 0; count < MAXDLCI; count++)
|
|
if (sc->dlci_state[count] == DLCI_UP)
|
|
sc->dlci_state[count] = DLCI_DOWN;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* State machine for LMI auto-detect. The transitions are ordered
|
|
* to try the more likely possibilities first.
|
|
*/
|
|
static void
|
|
ngauto_state_machine(sc_p sc)
|
|
{
|
|
if ((sc->poll_count <= 0) || (sc->poll_count > LMIPOLLSIZE)) {
|
|
/* time to change states in the auto probe machine */
|
|
/* capture wild values of poll_count while we are at it */
|
|
sc->poll_count = LMIPOLLSIZE;
|
|
sc->poll_state++;
|
|
}
|
|
switch (sc->poll_state) {
|
|
case 7:
|
|
log(LOG_WARNING, "nglmi: no response from exchange\n");
|
|
default: /* capture bad states */
|
|
sc->poll_state = 1;
|
|
case 1:
|
|
sc->lmi_channel = sc->lmi_channel0;
|
|
SETLMITYPE(sc, SCF_ANNEX_D);
|
|
break;
|
|
case 2:
|
|
sc->lmi_channel = sc->lmi_channel1023;
|
|
SETLMITYPE(sc, SCF_ANNEX_D);
|
|
break;
|
|
case 3:
|
|
sc->lmi_channel = sc->lmi_channel0;
|
|
SETLMITYPE(sc, SCF_ANNEX_A);
|
|
break;
|
|
case 4:
|
|
sc->lmi_channel = sc->lmi_channel1023;
|
|
SETLMITYPE(sc, SCF_GROUP4);
|
|
break;
|
|
case 5:
|
|
sc->lmi_channel = sc->lmi_channel1023;
|
|
SETLMITYPE(sc, SCF_ANNEX_A);
|
|
break;
|
|
case 6:
|
|
sc->lmi_channel = sc->lmi_channel0;
|
|
SETLMITYPE(sc, SCF_GROUP4);
|
|
break;
|
|
}
|
|
|
|
/* send an inquirey encoded appropriatly */
|
|
nglmi_inquire(sc, 0);
|
|
sc->poll_count--;
|
|
}
|
|
|
|
/*
|
|
* Receive a netgraph control message.
|
|
*/
|
|
static int
|
|
nglmi_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
|
|
struct ng_mesg **rptr, hook_p lasthook)
|
|
{
|
|
sc_p sc = node->private;
|
|
struct ng_mesg *resp = NULL;
|
|
int error = 0;
|
|
|
|
switch (msg->header.typecookie) {
|
|
case NGM_GENERIC_COOKIE:
|
|
switch (msg->header.cmd) {
|
|
case NGM_TEXT_STATUS:
|
|
{
|
|
char *arg;
|
|
int pos, count;
|
|
|
|
NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
|
|
if (resp == NULL) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
arg = resp->data;
|
|
pos = sprintf(arg, "protocol %s ", sc->protoname);
|
|
if (sc->flags & SCF_FIXED)
|
|
pos += sprintf(arg + pos, "fixed\n");
|
|
else if (sc->flags & SCF_AUTO)
|
|
pos += sprintf(arg + pos, "auto-detecting\n");
|
|
else
|
|
pos += sprintf(arg + pos, "auto on dlci %d\n",
|
|
(sc->lmi_channel == sc->lmi_channel0) ?
|
|
0 : 1023);
|
|
pos += sprintf(arg + pos,
|
|
"keepalive period: %d seconds\n", sc->liv_rate);
|
|
pos += sprintf(arg + pos,
|
|
"unacknowledged keepalives: %ld\n",
|
|
sc->seq_retries);
|
|
for (count = 0;
|
|
((count <= MAXDLCI)
|
|
&& (pos < (NG_TEXTRESPONSE - 20)));
|
|
count++) {
|
|
if (sc->dlci_state[count]) {
|
|
pos += sprintf(arg + pos,
|
|
"dlci %d %s\n", count,
|
|
(sc->dlci_state[count]
|
|
== DLCI_UP) ? "up" : "down");
|
|
}
|
|
}
|
|
resp->header.arglen = pos + 1;
|
|
break;
|
|
}
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
case NGM_LMI_COOKIE:
|
|
switch (msg->header.cmd) {
|
|
case NGM_LMI_GET_STATUS:
|
|
{
|
|
struct nglmistat *stat;
|
|
int k;
|
|
|
|
NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT);
|
|
if (!resp) {
|
|
error = ENOMEM;
|
|
break;
|
|
}
|
|
stat = (struct nglmistat *) resp->data;
|
|
strncpy(stat->proto,
|
|
sc->protoname, sizeof(stat->proto) - 1);
|
|
strncpy(stat->hook,
|
|
sc->protoname, sizeof(stat->hook) - 1);
|
|
stat->autod = !!(sc->flags & SCF_AUTO);
|
|
stat->fixed = !!(sc->flags & SCF_FIXED);
|
|
for (k = 0; k <= MAXDLCI; k++) {
|
|
switch (sc->dlci_state[k]) {
|
|
case DLCI_UP:
|
|
stat->up[k / 8] |= (1 << (k % 8));
|
|
/* fall through */
|
|
case DLCI_DOWN:
|
|
stat->seen[k / 8] |= (1 << (k % 8));
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (rptr)
|
|
*rptr = resp;
|
|
else if (resp != NULL)
|
|
FREE(resp, M_NETGRAPH);
|
|
|
|
FREE(msg, M_NETGRAPH);
|
|
return (error);
|
|
}
|
|
|
|
#define STEPBY(stepsize) \
|
|
do { \
|
|
packetlen -= (stepsize); \
|
|
data += (stepsize); \
|
|
} while (0)
|
|
|
|
/*
|
|
* receive data, and use it to update our status.
|
|
* Anything coming in on the debug port is discarded.
|
|
*/
|
|
static int
|
|
nglmi_rcvdata(hook_p hook, struct mbuf *m, meta_p meta,
|
|
struct mbuf **ret_m, meta_p *ret_meta, struct ng_mesg **resp)
|
|
{
|
|
sc_p sc = hook->node->private;
|
|
u_char *data;
|
|
unsigned short dlci;
|
|
u_short packetlen;
|
|
int resptype_seen = 0;
|
|
int seq_seen = 0;
|
|
|
|
if (hook->private == NULL) {
|
|
goto drop;
|
|
}
|
|
packetlen = m->m_hdr.mh_len;
|
|
|
|
/* XXX what if it's more than 1 mbuf? */
|
|
if ((packetlen > MHLEN) && !(m->m_flags & M_EXT)) {
|
|
log(LOG_WARNING, "nglmi: packetlen (%d) too big\n", packetlen);
|
|
goto drop;
|
|
}
|
|
if (m->m_len < packetlen && (m = m_pullup(m, packetlen)) == NULL) {
|
|
log(LOG_WARNING,
|
|
"nglmi: m_pullup failed for %d bytes\n", packetlen);
|
|
NG_FREE_META(meta);
|
|
return (0);
|
|
}
|
|
if (nglmi_checkdata(hook, m, meta) == 0)
|
|
return (0);
|
|
|
|
/* pass the first 4 bytes (already checked in the nglmi_checkdata()) */
|
|
data = mtod(m, u_char *);
|
|
STEPBY(4);
|
|
|
|
/* Now check if there is a 'locking shift'. This is only seen in
|
|
* Annex D frames. don't bother checking, we already did that. Don't
|
|
* increment immediatly as it might not be there. */
|
|
if (ANNEXD(sc))
|
|
STEPBY(1);
|
|
|
|
/* If we get this far we should consider that it is a legitimate
|
|
* frame and we know what it is. */
|
|
if (sc->flags & SCF_AUTO) {
|
|
/* note the hook that this valid channel came from and drop
|
|
* out of auto probe mode. */
|
|
if (ANNEXA(sc))
|
|
sc->protoname = NAME_ANNEXA;
|
|
else if (ANNEXD(sc))
|
|
sc->protoname = NAME_ANNEXD;
|
|
else if (GROUP4(sc))
|
|
sc->protoname = NAME_GROUP4;
|
|
else {
|
|
log(LOG_ERR, "nglmi: No known type\n");
|
|
goto drop;
|
|
}
|
|
sc->lmi_channel = hook;
|
|
sc->flags &= ~SCF_AUTO;
|
|
log(LOG_INFO, "nglmi: auto-detected %s LMI on DLCI %d\n",
|
|
sc->protoname, hook == sc->lmi_channel0 ? 0 : 1023);
|
|
}
|
|
|
|
/* While there is more data in the status packet, keep processing
|
|
* status items. First make sure there is enough data for the
|
|
* segment descriptor's length field. */
|
|
while (packetlen >= 2) {
|
|
u_int segtype = data[0];
|
|
u_int segsize = data[1];
|
|
|
|
/* Now that we know how long it claims to be, make sure
|
|
* there is enough data for the next seg. */
|
|
if (packetlen < segsize + 2)
|
|
break;
|
|
switch (segtype) {
|
|
case 0x01:
|
|
case 0x51:
|
|
if (resptype_seen) {
|
|
log(LOG_WARNING, "nglmi: dup MSGTYPE\n");
|
|
goto nextIE;
|
|
}
|
|
resptype_seen++;
|
|
/* The remote end tells us what kind of response
|
|
* this is. Only expect a type 0 or 1. if we are a
|
|
* full status, invalidate a few DLCIs just to see
|
|
* that they are still ok. */
|
|
if (segsize != 1)
|
|
goto nextIE;
|
|
switch (data[2]) {
|
|
case 1:
|
|
/* partial status, do no extra processing */
|
|
break;
|
|
case 0:
|
|
{
|
|
int count = 0;
|
|
int idx = sc->invalidx;
|
|
|
|
for (count = 0; count < 10; count++) {
|
|
if (idx > MAXDLCI)
|
|
idx = 0;
|
|
if (sc->dlci_state[idx] == DLCI_UP)
|
|
sc->dlci_state[idx] = DLCI_DOWN;
|
|
idx++;
|
|
}
|
|
sc->invalidx = idx;
|
|
/* we got and we wanted one. relax
|
|
* now.. but don't reset to 0 if it
|
|
* was unrequested. */
|
|
if (sc->livs > sc->liv_per_full)
|
|
sc->livs = 0;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case 0x03:
|
|
case 0x53:
|
|
/* The remote tells us what it thinks the sequence
|
|
* numbers are. If it's not size 2, it must be a
|
|
* duplicate to have gotten this far, skip it. */
|
|
if (seq_seen != 0) /* already seen seq numbers */
|
|
goto nextIE;
|
|
if (segsize != 2)
|
|
goto nextIE;
|
|
sc->remote_seq = data[2];
|
|
if (sc->local_seq == data[3]) {
|
|
sc->local_seq++;
|
|
sc->seq_retries = 0;
|
|
/* Note that all 3 Frame protocols seem to
|
|
* not like 0 as a sequence number. */
|
|
if (sc->local_seq == 0)
|
|
sc->local_seq = 1;
|
|
}
|
|
break;
|
|
case 0x07:
|
|
case 0x57:
|
|
/* The remote tells us about a DLCI that it knows
|
|
* about. There may be many of these in a single
|
|
* status response */
|
|
switch (segsize) {
|
|
case 6:/* only on 'group of 4' */
|
|
dlci = ((u_short) data[2] & 0xff) << 8;
|
|
dlci |= (data[3] & 0xff);
|
|
if ((dlci < 1024) && (dlci > 0)) {
|
|
/* XXX */
|
|
}
|
|
break;
|
|
case 3:
|
|
dlci = ((u_short) data[2] & 0x3f) << 4;
|
|
dlci |= ((data[3] & 0x78) >> 3);
|
|
if ((dlci < 1024) && (dlci > 0)) {
|
|
/* set up the bottom half of the
|
|
* support for that dlci if it's not
|
|
* already been done */
|
|
/* store this information somewhere */
|
|
}
|
|
break;
|
|
default:
|
|
goto nextIE;
|
|
}
|
|
if (sc->dlci_state[dlci] != DLCI_UP) {
|
|
/* bring new DLCI to life */
|
|
/* may do more here some day */
|
|
if (sc->dlci_state[dlci] != DLCI_DOWN)
|
|
log(LOG_INFO,
|
|
"nglmi: DLCI %d became active\n",
|
|
dlci);
|
|
sc->dlci_state[dlci] = DLCI_UP;
|
|
}
|
|
break;
|
|
}
|
|
nextIE:
|
|
STEPBY(segsize + 2);
|
|
}
|
|
NG_FREE_DATA(m, meta);
|
|
return (0);
|
|
|
|
drop:
|
|
NG_FREE_DATA(m, meta);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Check that a packet is entirely kosha.
|
|
* return 1 of ok, and 0 if not.
|
|
* All data is discarded if a 0 is returned.
|
|
*/
|
|
static int
|
|
nglmi_checkdata(hook_p hook, struct mbuf *m, meta_p meta)
|
|
{
|
|
sc_p sc = hook->node->private;
|
|
u_char *data;
|
|
u_short packetlen;
|
|
unsigned short dlci;
|
|
u_char type;
|
|
u_char nextbyte;
|
|
int seq_seen = 0;
|
|
int resptype_seen = 0; /* 0 , 1 (partial) or 2 (full) */
|
|
int highest_dlci = 0;
|
|
|
|
packetlen = m->m_hdr.mh_len;
|
|
data = mtod(m, u_char *);
|
|
if (*data != 0x03) {
|
|
log(LOG_WARNING, "nglmi: unexpected value in LMI(%d)\n", 1);
|
|
goto reject;
|
|
}
|
|
STEPBY(1);
|
|
|
|
/* look at the protocol ID */
|
|
nextbyte = *data;
|
|
if (sc->flags & SCF_AUTO) {
|
|
SETLMITYPE(sc, SCF_NOLMI); /* start with a clean slate */
|
|
switch (nextbyte) {
|
|
case 0x8:
|
|
sc->protoID = 8;
|
|
break;
|
|
case 0x9:
|
|
SETLMITYPE(sc, SCF_GROUP4);
|
|
sc->protoID = 9;
|
|
break;
|
|
default:
|
|
log(LOG_WARNING, "nglmi: bad Protocol ID(%d)\n",
|
|
(int) nextbyte);
|
|
goto reject;
|
|
}
|
|
} else {
|
|
if (nextbyte != sc->protoID) {
|
|
log(LOG_WARNING, "nglmi: unexpected Protocol ID(%d)\n",
|
|
(int) nextbyte);
|
|
goto reject;
|
|
}
|
|
}
|
|
STEPBY(1);
|
|
|
|
/* check call reference (always null in non ISDN frame relay) */
|
|
if (*data != 0x00) {
|
|
log(LOG_WARNING, "nglmi: unexpected Call Reference (0x%x)\n",
|
|
data[-1]);
|
|
goto reject;
|
|
}
|
|
STEPBY(1);
|
|
|
|
/* check message type */
|
|
switch ((type = *data)) {
|
|
case 0x75: /* Status enquiry */
|
|
log(LOG_WARNING, "nglmi: unexpected message type(0x%x)\n",
|
|
data[-1]);
|
|
goto reject;
|
|
case 0x7D: /* Status message */
|
|
break;
|
|
default:
|
|
log(LOG_WARNING,
|
|
"nglmi: unexpected msg type(0x%x) \n", (int) type);
|
|
goto reject;
|
|
}
|
|
STEPBY(1);
|
|
|
|
/* Now check if there is a 'locking shift'. This is only seen in
|
|
* Annex D frames. Don't increment immediately as it might not be
|
|
* there. */
|
|
nextbyte = *data;
|
|
if (sc->flags & SCF_AUTO) {
|
|
if (!(GROUP4(sc))) {
|
|
if (nextbyte == 0x95) {
|
|
SETLMITYPE(sc, SCF_ANNEX_D);
|
|
STEPBY(1);
|
|
} else
|
|
SETLMITYPE(sc, SCF_ANNEX_A);
|
|
} else if (nextbyte == 0x95) {
|
|
log(LOG_WARNING, "nglmi: locking shift seen in G4\n");
|
|
goto reject;
|
|
}
|
|
} else {
|
|
if (ANNEXD(sc)) {
|
|
if (*data == 0x95)
|
|
STEPBY(1);
|
|
else {
|
|
log(LOG_WARNING,
|
|
"nglmi: locking shift missing\n");
|
|
goto reject;
|
|
}
|
|
} else if (*data == 0x95) {
|
|
log(LOG_WARNING, "nglmi: locking shift seen\n");
|
|
goto reject;
|
|
}
|
|
}
|
|
|
|
/* While there is more data in the status packet, keep processing
|
|
* status items. First make sure there is enough data for the
|
|
* segment descriptor's length field. */
|
|
while (packetlen >= 2) {
|
|
u_int segtype = data[0];
|
|
u_int segsize = data[1];
|
|
|
|
/* Now that we know how long it claims to be, make sure
|
|
* there is enough data for the next seg. */
|
|
if (packetlen < (segsize + 2)) {
|
|
log(LOG_WARNING, "nglmi: IE longer than packet\n");
|
|
break;
|
|
}
|
|
switch (segtype) {
|
|
case 0x01:
|
|
case 0x51:
|
|
/* According to MCI's HP analyser, we should just
|
|
* ignore if there is mor ethan one of these (?). */
|
|
if (resptype_seen) {
|
|
log(LOG_WARNING, "nglmi: dup MSGTYPE\n");
|
|
goto nextIE;
|
|
}
|
|
if (segsize != 1) {
|
|
log(LOG_WARNING, "nglmi: MSGTYPE wrong size\n");
|
|
goto reject;
|
|
}
|
|
/* The remote end tells us what kind of response
|
|
* this is. Only expect a type 0 or 1. if it was a
|
|
* full (type 0) check we just asked for a type
|
|
* full. */
|
|
switch (data[2]) {
|
|
case 1:/* partial */
|
|
if (sc->livs > sc->liv_per_full) {
|
|
log(LOG_WARNING,
|
|
"nglmi: LIV when FULL expected\n");
|
|
goto reject; /* need full */
|
|
}
|
|
resptype_seen = 1;
|
|
break;
|
|
case 0:/* full */
|
|
/* Full response is always acceptable */
|
|
resptype_seen = 2;
|
|
break;
|
|
default:
|
|
log(LOG_WARNING,
|
|
"nglmi: Unknown report type %d\n", data[2]);
|
|
goto reject;
|
|
}
|
|
break;
|
|
case 0x03:
|
|
case 0x53:
|
|
/* The remote tells us what it thinks the sequence
|
|
* numbers are. I would have thought that there
|
|
* needs to be one and only one of these, but MCI
|
|
* want us to just ignore extras. (?) */
|
|
if (resptype_seen == 0) {
|
|
log(LOG_WARNING, "nglmi: no TYPE before SEQ\n");
|
|
goto reject;
|
|
}
|
|
if (seq_seen != 0) /* already seen seq numbers */
|
|
goto nextIE;
|
|
if (segsize != 2) {
|
|
log(LOG_WARNING, "nglmi: bad SEQ sts size\n");
|
|
goto reject;
|
|
}
|
|
if (sc->local_seq != data[3]) {
|
|
log(LOG_WARNING, "nglmi: unexpected SEQ\n");
|
|
goto reject;
|
|
}
|
|
seq_seen = 1;
|
|
break;
|
|
case 0x07:
|
|
case 0x57:
|
|
/* The remote tells us about a DLCI that it knows
|
|
* about. There may be many of these in a single
|
|
* status response */
|
|
if (seq_seen != 1) { /* already seen seq numbers? */
|
|
log(LOG_WARNING,
|
|
"nglmi: No sequence before DLCI\n");
|
|
goto reject;
|
|
}
|
|
if (resptype_seen != 2) { /* must be full */
|
|
log(LOG_WARNING,
|
|
"nglmi: No resp type before DLCI\n");
|
|
goto reject;
|
|
}
|
|
if (GROUP4(sc)) {
|
|
if (segsize != 6) {
|
|
log(LOG_WARNING,
|
|
"nglmi: wrong IE segsize\n");
|
|
goto reject;
|
|
}
|
|
dlci = ((u_short) data[2] & 0xff) << 8;
|
|
dlci |= (data[3] & 0xff);
|
|
} else {
|
|
if (segsize != 3) {
|
|
log(LOG_WARNING,
|
|
"nglmi: DLCI headersize of %d"
|
|
" not supported\n", segsize - 1);
|
|
goto reject;
|
|
}
|
|
dlci = ((u_short) data[2] & 0x3f) << 4;
|
|
dlci |= ((data[3] & 0x78) >> 3);
|
|
}
|
|
/* async can only have one of these */
|
|
#if 0 /* async not yet accepted */
|
|
if (async && highest_dlci) {
|
|
log(LOG_WARNING,
|
|
"nglmi: Async with > 1 DLCI\n");
|
|
goto reject;
|
|
}
|
|
#endif
|
|
/* Annex D says these will always be Ascending, but
|
|
* the HP test for G4 says we should accept
|
|
* duplicates, so for now allow that. ( <= vs. < ) */
|
|
#if 0
|
|
/* MCI tests want us to accept out of order for AnxD */
|
|
if ((!GROUP4(sc)) && (dlci < highest_dlci)) {
|
|
/* duplicate or mis-ordered dlci */
|
|
/* (spec says they will increase in number) */
|
|
log(LOG_WARNING, "nglmi: DLCI out of order\n");
|
|
goto reject;
|
|
}
|
|
#endif
|
|
if (dlci > 1023) {
|
|
log(LOG_WARNING, "nglmi: DLCI out of range\n");
|
|
goto reject;
|
|
}
|
|
highest_dlci = dlci;
|
|
break;
|
|
default:
|
|
log(LOG_WARNING,
|
|
"nglmi: unknown LMI segment type %d\n", segtype);
|
|
}
|
|
nextIE:
|
|
STEPBY(segsize + 2);
|
|
}
|
|
if (packetlen != 0) { /* partial junk at end? */
|
|
log(LOG_WARNING,
|
|
"nglmi: %d bytes extra at end of packet\n", packetlen);
|
|
goto print;
|
|
}
|
|
if (resptype_seen == 0) {
|
|
log(LOG_WARNING, "nglmi: No response type seen\n");
|
|
goto reject; /* had no response type */
|
|
}
|
|
if (seq_seen == 0) {
|
|
log(LOG_WARNING, "nglmi: No sequence numbers seen\n");
|
|
goto reject; /* had no sequence numbers */
|
|
}
|
|
return (1);
|
|
|
|
print:
|
|
{
|
|
int i, j, k, pos;
|
|
char buf[100];
|
|
int loc;
|
|
u_char *bp = mtod(m, u_char *);
|
|
|
|
k = i = 0;
|
|
loc = (m->m_hdr.mh_len - packetlen);
|
|
log(LOG_WARNING, "nglmi: error at location %d\n", loc);
|
|
while (k < m->m_hdr.mh_len) {
|
|
pos = 0;
|
|
j = 0;
|
|
while ((j++ < 16) && k < m->m_hdr.mh_len) {
|
|
pos += sprintf(buf + pos, "%c%02x",
|
|
((loc == k) ? '>' : ' '),
|
|
bp[k]);
|
|
k++;
|
|
}
|
|
if (i == 0)
|
|
log(LOG_WARNING, "nglmi: packet data:%s\n", buf);
|
|
else
|
|
log(LOG_WARNING, "%04d :%s\n", k, buf);
|
|
i++;
|
|
}
|
|
}
|
|
return (1);
|
|
reject:
|
|
{
|
|
int i, j, k, pos;
|
|
char buf[100];
|
|
int loc;
|
|
u_char *bp = mtod(m, u_char *);
|
|
|
|
k = i = 0;
|
|
loc = (m->m_hdr.mh_len - packetlen);
|
|
log(LOG_WARNING, "nglmi: error at location %d\n", loc);
|
|
while (k < m->m_hdr.mh_len) {
|
|
pos = 0;
|
|
j = 0;
|
|
while ((j++ < 16) && k < m->m_hdr.mh_len) {
|
|
pos += sprintf(buf + pos, "%c%02x",
|
|
((loc == k) ? '>' : ' '),
|
|
bp[k]);
|
|
k++;
|
|
}
|
|
if (i == 0)
|
|
log(LOG_WARNING, "nglmi: packet data:%s\n", buf);
|
|
else
|
|
log(LOG_WARNING, "%04d :%s\n", k, buf);
|
|
i++;
|
|
}
|
|
}
|
|
NG_FREE_DATA(m, meta);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Do local shutdown processing..
|
|
* Cut any remaining links and free our local resources.
|
|
*/
|
|
static int
|
|
nglmi_rmnode(node_p node)
|
|
{
|
|
const sc_p sc = node->private;
|
|
|
|
node->flags |= NG_INVALID;
|
|
ng_cutlinks(node);
|
|
ng_unname(node);
|
|
node->private = NULL;
|
|
ng_unref(sc->node);
|
|
FREE(sc, M_NETGRAPH);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hook disconnection
|
|
* For this type, removal of any link except "debug" destroys the node.
|
|
*/
|
|
static int
|
|
nglmi_disconnect(hook_p hook)
|
|
{
|
|
const sc_p sc = hook->node->private;
|
|
|
|
/* OK to remove debug hook(s) */
|
|
if (hook->private == NULL)
|
|
return (0);
|
|
|
|
/* Stop timer if it's currently active */
|
|
if (sc->flags & SCF_CONNECTED)
|
|
untimeout(LMI_ticker, sc, sc->handle);
|
|
|
|
/* Self-destruct */
|
|
ng_rmnode(hook->node);
|
|
return (0);
|
|
}
|
|
|