[dragonfly.git] / sys / netgraph7 / ng_rfc1490.c

/*
 * ng_rfc1490.c
 */

/*-
 * Copyright (c) 1996-1999 Whistle Communications, Inc.
 * All rights reserved.
 * 
 * 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.
 * 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
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * Author: Julian Elischer <julian@freebsd.org>
 *
 * $FreeBSD: src/sys/netgraph/ng_rfc1490.c,v 1.24 2005/01/07 01:45:39 imp Exp $
 * $DragonFly: src/sys/netgraph7/ng_rfc1490.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
 * $Whistle: ng_rfc1490.c,v 1.22 1999/11/01 09:24:52 julian Exp $
 */

/*
 * This node does RFC 1490 multiplexing.
 *
 * NOTE: RFC 1490 is updated by RFC 2427.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/socket.h>

#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>

#include "ng_message.h"
#include "netgraph.h"
#include "ng_parse.h"
#include "ng_rfc1490.h"

/*
 * DEFINITIONS
 */

/* Q.922 stuff -- see RFC 1490 */
#define HDLC_UI		0x03

#define NLPID_IP	0xCC
#define NLPID_PPP	0xCF
#define NLPID_SNAP	0x80
#define NLPID_Q933	0x08
#define NLPID_CLNP	0x81
#define NLPID_ESIS	0x82
#define NLPID_ISIS	0x83

#define ERROUT(x)	do { error = (x); goto done; } while (0)

/* Encapsulation methods we understand */
enum {
	NG_RFC1490_ENCAP_IETF_IP = 1,	/* see RFC2427, chapter 7, table 1 */
	NG_RFC1490_ENCAP_IETF_SNAP,	/* see RFC2427, chapter 7, table 2 */
	NG_RFC1490_ENCAP_CISCO,		/* Cisco's proprietary encapsulation */
};

struct ng_rfc1490_encap_t {
	u_int8_t	method;
	const char	*name;
};

static const struct ng_rfc1490_encap_t ng_rfc1490_encaps[] = {
	{ NG_RFC1490_ENCAP_IETF_IP,	"ietf-ip" },
	{ NG_RFC1490_ENCAP_IETF_SNAP,	"ietf-snap" },
	{ NG_RFC1490_ENCAP_CISCO,	"cisco" },
	{ 0, NULL},
};

/* Node private data */
struct ng_rfc1490_private {
	hook_p  downlink;
	hook_p  ppp;
	hook_p  inet;
	hook_p  ethernet;
	const struct ng_rfc1490_encap_t *enc;
};
typedef struct ng_rfc1490_private *priv_p;

/* Netgraph node methods */
static ng_constructor_t	ng_rfc1490_constructor;
static ng_rcvmsg_t	ng_rfc1490_rcvmsg;
static ng_shutdown_t	ng_rfc1490_shutdown;
static ng_newhook_t	ng_rfc1490_newhook;
static ng_rcvdata_t	ng_rfc1490_rcvdata;
static ng_disconnect_t	ng_rfc1490_disconnect;

/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_rfc1490_cmds[] = {
	{
	  NGM_RFC1490_COOKIE,
	  NGM_RFC1490_SET_ENCAP,
	  "setencap",
	  &ng_parse_string_type,
	  NULL
	},
	{
	  NGM_RFC1490_COOKIE,
	  NGM_RFC1490_GET_ENCAP,
	  "getencap",
	  NULL,
	  &ng_parse_string_type
	},
	{ 0 }
};

/* Node type descriptor */
static struct ng_type typestruct = {
	.version =	NG_ABI_VERSION,
	.name =		NG_RFC1490_NODE_TYPE,
	.constructor =	ng_rfc1490_constructor,
	.rcvmsg =	ng_rfc1490_rcvmsg,
	.shutdown =	ng_rfc1490_shutdown,
	.newhook =	ng_rfc1490_newhook,
	.rcvdata =	ng_rfc1490_rcvdata,
	.disconnect =	ng_rfc1490_disconnect,
	.cmdlist =	ng_rfc1490_cmds,
};
NETGRAPH_INIT(rfc1490, &typestruct);

/************************************************************************
			NETGRAPH NODE STUFF
 ************************************************************************/

/*
 * Node constructor
 */
static int
ng_rfc1490_constructor(node_p node)
{
	priv_p priv;

	/* Allocate private structure */
	priv = kmalloc(sizeof(*priv), M_NETGRAPH,
		       M_WAITOK | M_NULLOK | M_ZERO);
	if (priv == NULL)
		return (ENOMEM);

	/* Initialize to default encapsulation method - ietf-ip */
	priv->enc = ng_rfc1490_encaps;

	NG_NODE_SET_PRIVATE(node, priv);

	/* Done */
	return (0);
}

/*
 * Give our ok for a hook to be added
 */
static int
ng_rfc1490_newhook(node_p node, hook_p hook, const char *name)
{
	const priv_p priv = NG_NODE_PRIVATE(node);

	if (!strcmp(name, NG_RFC1490_HOOK_DOWNSTREAM)) {
		if (priv->downlink)
			return (EISCONN);
		priv->downlink = hook;
	} else if (!strcmp(name, NG_RFC1490_HOOK_PPP)) {
		if (priv->ppp)
			return (EISCONN);
		priv->ppp = hook;
	} else if (!strcmp(name, NG_RFC1490_HOOK_INET)) {
		if (priv->inet)
			return (EISCONN);
		priv->inet = hook;
	} else if (!strcmp(name, NG_RFC1490_HOOK_ETHERNET)) {
		if (priv->ethernet)
			return (EISCONN);
		priv->ethernet = hook;
	} else
		return (EINVAL);
	return (0);
}

/*
 * Receive a control message.
 */
static int
ng_rfc1490_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
	const priv_p priv = NG_NODE_PRIVATE(node);
	struct ng_mesg *msg;
	struct ng_mesg *resp = NULL;
	int error = 0;

	NGI_GET_MSG(item, msg);

	if (msg->header.typecookie == NGM_RFC1490_COOKIE) {
		switch (msg->header.cmd) {
		case NGM_RFC1490_SET_ENCAP:
		{
			const struct ng_rfc1490_encap_t *enc;
			char *s;
			size_t len;

			if (msg->header.arglen == 0)
				ERROUT(EINVAL);

			s = (char *)msg->data;
			len = msg->header.arglen - 1;

			/* Search for matching encapsulation method */
			for (enc = ng_rfc1490_encaps; enc->method != 0; enc++ )
				if ((strlen(enc->name) == len) &&
				    !strncmp(enc->name, s, len))
					break;	/* found */

			if (enc->method != 0)
				priv->enc = enc;
			else
				error = EINVAL;
			break;
		}
		case NGM_RFC1490_GET_ENCAP:

			NG_MKRESPONSE(resp, msg, strlen(priv->enc->name) + 1, M_WAITOK | M_NULLOK);
			if (resp == NULL)
				ERROUT(ENOMEM);

			strlcpy((char *)resp->data, priv->enc->name,
			    strlen(priv->enc->name) + 1);
			break;

		default:
			error = EINVAL;
			break;
		}
	} else
		error = EINVAL;

done:
	NG_RESPOND_MSG(error, node, item, resp);
	NG_FREE_MSG(msg);
	return (error);
}

/*
 * Receive data on a hook and encapsulate according to RFC 1490.
 * Only those nodes marked (*) are supported by this routine so far.
 *
 *                            Q.922 control
 *                                 |
 *                                 |
 *            ---------------------------------------------------------------------
 *            | 0x03                                     |                        |
 *           UI                                       I Frame                   Cisco
 *            |                                          |                  Encapsulation
 *      ---------------------------------         --------------                  |
 *      | 0x08  | 0x81  |0xCC   |0xCF   | 0x00    |..01....    |..10....   --------------
 *      |       |       |       |       | 0x80    |            |           |0x800       |
 *     Q.933   CLNP    IP(*)   PPP(*)  SNAP     ISO 8208    ISO 8208       |            |
 *      |                    (rfc1973)  |       Modulo 8    Modulo 128     IP(*)     Others
 *      |                               |
 *      --------------------           OUI
 *      |                  |            |
 *     L2 ID              L3 ID      -------------------------
 *      |               User         |00-80-C2               |00-00-00
 *      |               specified    |                       |
 *      |               0x70        PID                     Ethertype
 *      |                            |                       |
 *      -------------------        -----------------...     ----------
 *      |0x51 |0x4E |     |0x4C    |0x7      |0xB  |        |0x806   |
 *      |     |     |     |        |         |     |        |        |
 *     7776  Q.922 Others 802.2   802.3(*)  802.6 Others    IP(*)   Others
 *
 *
 */

#define MAX_ENCAPS_HDR	8
#define OUICMP(P,A,B,C)	((P)[0]==(A) && (P)[1]==(B) && (P)[2]==(C))

static int
ng_rfc1490_rcvdata(hook_p hook, item_p item)
{
	const node_p node = NG_HOOK_NODE(hook);
	const priv_p priv = NG_NODE_PRIVATE(node);
	int error = 0;
	struct mbuf *m;

	NGI_GET_M(item, m);
	if (hook == priv->downlink) {
		const u_char *start;
		const u_char *ptr;

		if (m->m_len < MAX_ENCAPS_HDR
		    && !(m = m_pullup(m, MAX_ENCAPS_HDR)))
			ERROUT(ENOBUFS);
		ptr = start = mtod(m, const u_char *);

		if (priv->enc->method == NG_RFC1490_ENCAP_CISCO)
			goto switch_on_etype;

		/* Must be UI frame */
		if (*ptr++ != HDLC_UI)
			ERROUT(0);

		/* Eat optional zero pad byte */
		if (*ptr == 0x00)
			ptr++;

		/* Multiplex on NLPID */
		switch (*ptr++) {
		case NLPID_SNAP:
			if (OUICMP(ptr, 0, 0, 0)) {	/* It's an ethertype */
				u_int16_t etype;

				ptr += 3;
switch_on_etype:		etype = ntohs(*((const u_int16_t *)ptr));
				ptr += 2;
				m_adj(m, ptr - start);
				switch (etype) {
				case ETHERTYPE_IP:
					NG_FWD_NEW_DATA(error, item,
					    priv->inet, m);
					break;
				case ETHERTYPE_ARP:
				case ETHERTYPE_REVARP:
				default:
					ERROUT(0);
				}
			} else if (OUICMP(ptr, 0x00, 0x80, 0xc2)) {
				/* 802.1 bridging */
				ptr += 3;
				if (*ptr++ != 0x00)
					ERROUT(0);	/* unknown PID octet 0 */
				if (*ptr++ != 0x07)
					ERROUT(0);	/* not FCS-less 802.3 */
				m_adj(m, ptr - start);
				NG_FWD_NEW_DATA(error, item, priv->ethernet, m);
			} else	/* Other weird stuff... */
				ERROUT(0);
			break;
		case NLPID_IP:
			m_adj(m, ptr - start);
			NG_FWD_NEW_DATA(error, item, priv->inet, m);
			break;
		case NLPID_PPP:
			m_adj(m, ptr - start);
			NG_FWD_NEW_DATA(error, item, priv->ppp, m);
			break;
		case NLPID_Q933:
		case NLPID_CLNP:
		case NLPID_ESIS:
		case NLPID_ISIS:
			ERROUT(0);
		default:	/* Try PPP (see RFC 1973) */
			ptr--;	/* NLPID becomes PPP proto */
			if ((*ptr & 0x01) == 0x01)
				ERROUT(0);
			m_adj(m, ptr - start);
			NG_FWD_NEW_DATA(error, item, priv->ppp, m);
			break;
		}
	} else if (hook == priv->ppp) {
		M_PREPEND(m, 2, MB_DONTWAIT);	/* Prepend PPP NLPID */
		if (!m)
			ERROUT(ENOBUFS);
		mtod(m, u_char *)[0] = HDLC_UI;
		mtod(m, u_char *)[1] = NLPID_PPP;
		NG_FWD_NEW_DATA(error, item, priv->downlink, m);
	} else if (hook == priv->inet) {
		switch (priv->enc->method) {
		case NG_RFC1490_ENCAP_IETF_IP:
			M_PREPEND(m, 2, MB_DONTWAIT);	/* Prepend IP NLPID */
			if (!m)
				ERROUT(ENOBUFS);
			mtod(m, u_char *)[0] = HDLC_UI;
			mtod(m, u_char *)[1] = NLPID_IP;
			break;
		case NG_RFC1490_ENCAP_IETF_SNAP:
			/*
			 *  According to RFC2427 frame should begin with
			 *  HDLC_UI  PAD  NLIPID  OUI      PID
			 *  03      00   80      00 00 00  08 00
			 */
			M_PREPEND(m, 8, MB_DONTWAIT);
			if (!m)
				ERROUT(ENOBUFS);
			mtod(m, u_char *)[0] = HDLC_UI;
			mtod(m, u_char *)[1] = 0x00;			/* PAD */
			mtod(m, u_char *)[2] = NLPID_SNAP;
			bzero((char *)(mtod(m, u_char *) + 3), 3);	/* OUI 0-0-0 */
			*((u_int16_t *)mtod(m, u_int16_t *) + 6/sizeof(u_int16_t))
			    = htons(ETHERTYPE_IP);  /* PID */
			break;
		case NG_RFC1490_ENCAP_CISCO:
			M_PREPEND(m, 2, MB_DONTWAIT);	/* Prepend IP ethertype */
			if (!m)
				ERROUT(ENOBUFS);
			*((u_int16_t *)mtod(m, u_int16_t *)) = htons(ETHERTYPE_IP);
			break;
		}
		NG_FWD_NEW_DATA(error, item, priv->downlink, m);
	} else if (hook == priv->ethernet) {
		M_PREPEND(m, 8, MB_DONTWAIT);	/* Prepend NLPID, OUI, PID */
		if (!m)
			ERROUT(ENOBUFS);
		mtod(m, u_char *)[0] = HDLC_UI;
		mtod(m, u_char *)[1] = 0x00;		/* pad */
		mtod(m, u_char *)[2] = NLPID_SNAP;
		mtod(m, u_char *)[3] = 0x00;		/* OUI */
		mtod(m, u_char *)[4] = 0x80;
		mtod(m, u_char *)[5] = 0xc2;
		mtod(m, u_char *)[6] = 0x00;		/* PID */
		mtod(m, u_char *)[7] = 0x07;
		NG_FWD_NEW_DATA(error, item, priv->downlink, m);
	} else
		panic(__func__);

done:
	if (item)
		NG_FREE_ITEM(item);
	NG_FREE_M(m);
	return (error);
}

/*
 * Nuke node
 */
static int
ng_rfc1490_shutdown(node_p node)
{
	const priv_p priv = NG_NODE_PRIVATE(node);

	/* Take down netgraph node */
	bzero(priv, sizeof(*priv));
	kfree(priv, M_NETGRAPH);
	NG_NODE_SET_PRIVATE(node, NULL);
	NG_NODE_UNREF(node);		/* let the node escape */
	return (0);
}

/*
 * Hook disconnection
 */
static int
ng_rfc1490_disconnect(hook_p hook)
{
	const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));

	if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
	&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
		ng_rmnode_self(NG_HOOK_NODE(hook));
	else if (hook == priv->downlink)
		priv->downlink = NULL;
	else if (hook == priv->inet)
		priv->inet = NULL;
	else if (hook == priv->ppp)
		priv->ppp = NULL;
	else if (hook == priv->ethernet)
		priv->ethernet = NULL;
	else
		panic(__func__);
	return (0);
}
Commit	Line	Data
b06ebda0 MD	1	/*
	2	* ng_rfc1490.c
	3	*/
	4
	5	/*-
	6	* Copyright (c) 1996-1999 Whistle Communications, Inc.
	7	* All rights reserved.
	8	*
	9	* Subject to the following obligations and disclaimer of warranty, use and
	10	* redistribution of this software, in source or object code forms, with or
	11	* without modifications are expressly permitted by Whistle Communications;
	12	* provided, however, that:
	13	* 1. Any and all reproductions of the source or object code must include the
	14	* copyright notice above and the following disclaimer of warranties; and
	15	* 2. No rights are granted, in any manner or form, to use Whistle
	16	* Communications, Inc. trademarks, including the mark "WHISTLE
	17	* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
	18	* such appears in the above copyright notice or in the software.
	19	*
	20	* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
	21	* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
	22	* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
	23	* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
	24	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
	25	* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
	26	* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
	27	* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
	28	* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
	29	* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
	30	* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
	31	* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
	32	* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
	33	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	34	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	35	* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
	36	* OF SUCH DAMAGE.
	37	*
	38	* Author: Julian Elischer <julian@freebsd.org>
	39	*
	40	* $FreeBSD: src/sys/netgraph/ng_rfc1490.c,v 1.24 2005/01/07 01:45:39 imp Exp $
5a975a3d	41	* $DragonFly: src/sys/netgraph7/ng_rfc1490.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
b06ebda0 MD	42	* $Whistle: ng_rfc1490.c,v 1.22 1999/11/01 09:24:52 julian Exp $
	43	*/
	44
	45	/*
	46	* This node does RFC 1490 multiplexing.
	47	*
	48	* NOTE: RFC 1490 is updated by RFC 2427.
	49	*/
	50
	51	#include <sys/param.h>
	52	#include <sys/systm.h>
	53	#include <sys/errno.h>
	54	#include <sys/kernel.h>
	55	#include <sys/malloc.h>
	56	#include <sys/mbuf.h>
	57	#include <sys/errno.h>
	58	#include <sys/socket.h>
	59
	60	#include <net/if.h>
	61	#include <netinet/in.h>
	62	#include <netinet/if_ether.h>
	63
5a975a3d MD	64	#include "ng_message.h"
	65	#include "netgraph.h"
	66	#include "ng_parse.h"
	67	#include "ng_rfc1490.h"
b06ebda0 MD	68
	69	/*
	70	* DEFINITIONS
	71	*/
	72
	73	/* Q.922 stuff -- see RFC 1490 */
	74	#define HDLC_UI 0x03
	75
	76	#define NLPID_IP 0xCC
	77	#define NLPID_PPP 0xCF
	78	#define NLPID_SNAP 0x80
	79	#define NLPID_Q933 0x08
	80	#define NLPID_CLNP 0x81
	81	#define NLPID_ESIS 0x82
	82	#define NLPID_ISIS 0x83
	83
	84	#define ERROUT(x) do { error = (x); goto done; } while (0)
	85
	86	/* Encapsulation methods we understand */
	87	enum {
	88	NG_RFC1490_ENCAP_IETF_IP = 1, /* see RFC2427, chapter 7, table 1 */
	89	NG_RFC1490_ENCAP_IETF_SNAP, /* see RFC2427, chapter 7, table 2 */
	90	NG_RFC1490_ENCAP_CISCO, /* Cisco's proprietary encapsulation */
	91	};
	92
	93	struct ng_rfc1490_encap_t {
	94	u_int8_t method;
	95	const char *name;
	96	};
	97
	98	static const struct ng_rfc1490_encap_t ng_rfc1490_encaps[] = {
	99	{ NG_RFC1490_ENCAP_IETF_IP, "ietf-ip" },
	100	{ NG_RFC1490_ENCAP_IETF_SNAP, "ietf-snap" },
	101	{ NG_RFC1490_ENCAP_CISCO, "cisco" },
	102	{ 0, NULL},
	103	};
	104
	105	/* Node private data */
	106	struct ng_rfc1490_private {
	107	hook_p downlink;
	108	hook_p ppp;
	109	hook_p inet;
	110	hook_p ethernet;
	111	const struct ng_rfc1490_encap_t *enc;
	112	};
	113	typedef struct ng_rfc1490_private *priv_p;
	114
	115	/* Netgraph node methods */
	116	static ng_constructor_t ng_rfc1490_constructor;
	117	static ng_rcvmsg_t ng_rfc1490_rcvmsg;
	118	static ng_shutdown_t ng_rfc1490_shutdown;
	119	static ng_newhook_t ng_rfc1490_newhook;
	120	static ng_rcvdata_t ng_rfc1490_rcvdata;
	121	static ng_disconnect_t ng_rfc1490_disconnect;
	122
	123	/* List of commands and how to convert arguments to/from ASCII */
	124	static const struct ng_cmdlist ng_rfc1490_cmds[] = {
	125	{
	126	NGM_RFC1490_COOKIE,
	127	NGM_RFC1490_SET_ENCAP,
	128	"setencap",
	129	&ng_parse_string_type,
	130	NULL
	131	},
132	{
133	NGM_RFC1490_COOKIE,
134	NGM_RFC1490_GET_ENCAP,
135	"getencap",
136	NULL,
137	&ng_parse_string_type
138	},
139	{ 0 }
140	};
141
142	/* Node type descriptor */
143	static struct ng_type typestruct = {
144	.version = NG_ABI_VERSION,
145	.name = NG_RFC1490_NODE_TYPE,
146	.constructor = ng_rfc1490_constructor,
147	.rcvmsg = ng_rfc1490_rcvmsg,
148	.shutdown = ng_rfc1490_shutdown,
149	.newhook = ng_rfc1490_newhook,
150	.rcvdata = ng_rfc1490_rcvdata,
151	.disconnect = ng_rfc1490_disconnect,
152	.cmdlist = ng_rfc1490_cmds,
153	};
154	NETGRAPH_INIT(rfc1490, &typestruct);
155
156	/************************************************************************
157	NETGRAPH NODE STUFF
158	************************************************************************/
159
160	/*
161	* Node constructor
162	*/
163	static int
164	ng_rfc1490_constructor(node_p node)
165	{
166	priv_p priv;
167
168	/* Allocate private structure */
fc025606 SW	169	priv = kmalloc(sizeof(*priv), M_NETGRAPH,
fc025606 SW	170	M_WAITOK \| M_NULLOK \| M_ZERO);
b06ebda0 MD	171	if (priv == NULL)
	172	return (ENOMEM);
	173
	174	/* Initialize to default encapsulation method - ietf-ip */
	175	priv->enc = ng_rfc1490_encaps;
	176
	177	NG_NODE_SET_PRIVATE(node, priv);
	178
	179	/* Done */
	180	return (0);
	181	}
	182
	183	/*
	184	* Give our ok for a hook to be added
	185	*/
	186	static int
	187	ng_rfc1490_newhook(node_p node, hook_p hook, const char *name)
	188	{
	189	const priv_p priv = NG_NODE_PRIVATE(node);
	190
	191	if (!strcmp(name, NG_RFC1490_HOOK_DOWNSTREAM)) {
	192	if (priv->downlink)
	193	return (EISCONN);
	194	priv->downlink = hook;
	195	} else if (!strcmp(name, NG_RFC1490_HOOK_PPP)) {
	196	if (priv->ppp)
	197	return (EISCONN);
	198	priv->ppp = hook;
	199	} else if (!strcmp(name, NG_RFC1490_HOOK_INET)) {
	200	if (priv->inet)
	201	return (EISCONN);
	202	priv->inet = hook;
	203	} else if (!strcmp(name, NG_RFC1490_HOOK_ETHERNET)) {
	204	if (priv->ethernet)
	205	return (EISCONN);
	206	priv->ethernet = hook;
	207	} else
	208	return (EINVAL);
	209	return (0);
	210	}
	211
	212	/*
	213	* Receive a control message.
	214	*/
	215	static int
	216	ng_rfc1490_rcvmsg(node_p node, item_p item, hook_p lasthook)
	217	{
	218	const priv_p priv = NG_NODE_PRIVATE(node);
	219	struct ng_mesg *msg;
	220	struct ng_mesg *resp = NULL;
	221	int error = 0;
	222
	223	NGI_GET_MSG(item, msg);
	224
	225	if (msg->header.typecookie == NGM_RFC1490_COOKIE) {
	226	switch (msg->header.cmd) {
	227	case NGM_RFC1490_SET_ENCAP:
	228	{
	229	const struct ng_rfc1490_encap_t *enc;
	230	char *s;
	231	size_t len;
	232
	233	if (msg->header.arglen == 0)
	234	ERROUT(EINVAL);
235
236	s = (char *)msg->data;
237	len = msg->header.arglen - 1;
238
239	/* Search for matching encapsulation method */
240	for (enc = ng_rfc1490_encaps; enc->method != 0; enc++ )
241	if ((strlen(enc->name) == len) &&
242	!strncmp(enc->name, s, len))
243	break; /* found */
244
245	if (enc->method != 0)
246	priv->enc = enc;
247	else
248	error = EINVAL;
249	break;
250	}
251	case NGM_RFC1490_GET_ENCAP:
252
5a975a3d	253	NG_MKRESPONSE(resp, msg, strlen(priv->enc->name) + 1, M_WAITOK \| M_NULLOK);
b06ebda0 MD	254	if (resp == NULL)
	255	ERROUT(ENOMEM);
	256
	257	strlcpy((char *)resp->data, priv->enc->name,
	258	strlen(priv->enc->name) + 1);
	259	break;
	260
	261	default:
	262	error = EINVAL;
	263	break;
	264	}
	265	} else
	266	error = EINVAL;
	267
	268	done:
	269	NG_RESPOND_MSG(error, node, item, resp);
	270	NG_FREE_MSG(msg);
	271	return (error);
	272	}
	273
	274	/*
	275	* Receive data on a hook and encapsulate according to RFC 1490.
	276	* Only those nodes marked (*) are supported by this routine so far.
	277	*
	278	* Q.922 control
	279	* \|
	280	* \|
	281	* ---------------------------------------------------------------------
	282	* \| 0x03 \| \|
	283	* UI I Frame Cisco
	284	* \| \| Encapsulation
	285	* --------------------------------- -------------- \|
	286	* \| 0x08 \| 0x81 \|0xCC \|0xCF \| 0x00 \|..01.... \|..10.... --------------
	287	* \| \| \| \| \| 0x80 \| \| \|0x800 \|
	288	* Q.933 CLNP IP() PPP() SNAP ISO 8208 ISO 8208 \| \|
	289	* \| (rfc1973) \| Modulo 8 Modulo 128 IP(*) Others
	290	* \| \|
	291	* -------------------- OUI
	292	* \| \| \|
	293	* L2 ID L3 ID -------------------------
	294	* \| User \|00-80-C2 \|00-00-00
	295	* \| specified \| \|
	296	* \| 0x70 PID Ethertype
	297	* \| \| \|
	298	* ------------------- -----------------... ----------
	299	* \|0x51 \|0x4E \| \|0x4C \|0x7 \|0xB \| \|0x806 \|
	300	* \| \| \| \| \| \| \| \| \|
	301	* 7776 Q.922 Others 802.2 802.3() 802.6 Others IP() Others
	302	*
	303	*
	304	*/
	305
	306	#define MAX_ENCAPS_HDR 8
	307	#define OUICMP(P,A,B,C) ((P)[0]==(A) && (P)[1]==(B) && (P)[2]==(C))
	308
	309	static int
	310	ng_rfc1490_rcvdata(hook_p hook, item_p item)
	311	{
	312	const node_p node = NG_HOOK_NODE(hook);
	313	const priv_p priv = NG_NODE_PRIVATE(node);
	314	int error = 0;
	315	struct mbuf *m;
	316
	317	NGI_GET_M(item, m);
318	if (hook == priv->downlink) {
319	const u_char *start;
320	const u_char *ptr;
321
322	if (m->m_len < MAX_ENCAPS_HDR
323	&& !(m = m_pullup(m, MAX_ENCAPS_HDR)))
324	ERROUT(ENOBUFS);
325	ptr = start = mtod(m, const u_char *);
326
327	if (priv->enc->method == NG_RFC1490_ENCAP_CISCO)
328	goto switch_on_etype;
329
330	/* Must be UI frame */
331	if (*ptr++ != HDLC_UI)
332	ERROUT(0);
333
334	/* Eat optional zero pad byte */
335	if (*ptr == 0x00)
336	ptr++;
337
338	/* Multiplex on NLPID */
339	switch (*ptr++) {
340	case NLPID_SNAP:
341	if (OUICMP(ptr, 0, 0, 0)) { /* It's an ethertype */
342	u_int16_t etype;
343
344	ptr += 3;
345	switch_on_etype: etype = ntohs(((const u_int16_t )ptr));
346	ptr += 2;
347	m_adj(m, ptr - start);
348	switch (etype) {
349	case ETHERTYPE_IP:
350	NG_FWD_NEW_DATA(error, item,
351	priv->inet, m);
352	break;
353	case ETHERTYPE_ARP:
354	case ETHERTYPE_REVARP:
355	default:
356	ERROUT(0);
357	}
358	} else if (OUICMP(ptr, 0x00, 0x80, 0xc2)) {
359	/* 802.1 bridging */
360	ptr += 3;
361	if (*ptr++ != 0x00)
362	ERROUT(0); /* unknown PID octet 0 */
363	if (*ptr++ != 0x07)
364	ERROUT(0); /* not FCS-less 802.3 */
365	m_adj(m, ptr - start);
366	NG_FWD_NEW_DATA(error, item, priv->ethernet, m);
367	} else /* Other weird stuff... */
368	ERROUT(0);
369	break;
370	case NLPID_IP:
371	m_adj(m, ptr - start);
372	NG_FWD_NEW_DATA(error, item, priv->inet, m);
373	break;
374	case NLPID_PPP:
375	m_adj(m, ptr - start);
376	NG_FWD_NEW_DATA(error, item, priv->ppp, m);
377	break;
378	case NLPID_Q933:
379	case NLPID_CLNP:
380	case NLPID_ESIS:
381	case NLPID_ISIS:
382	ERROUT(0);
383	default: /* Try PPP (see RFC 1973) */
384	ptr--; /* NLPID becomes PPP proto */
385	if ((*ptr & 0x01) == 0x01)
386	ERROUT(0);
387	m_adj(m, ptr - start);
388	NG_FWD_NEW_DATA(error, item, priv->ppp, m);
389	break;
390	}
391	} else if (hook == priv->ppp) {
5a975a3d	392	M_PREPEND(m, 2, MB_DONTWAIT); /* Prepend PPP NLPID */
b06ebda0 MD	393	if (!m)
	394	ERROUT(ENOBUFS);
	395	mtod(m, u_char *)[0] = HDLC_UI;
	396	mtod(m, u_char *)[1] = NLPID_PPP;
	397	NG_FWD_NEW_DATA(error, item, priv->downlink, m);
	398	} else if (hook == priv->inet) {
	399	switch (priv->enc->method) {
	400	case NG_RFC1490_ENCAP_IETF_IP:
5a975a3d	401	M_PREPEND(m, 2, MB_DONTWAIT); /* Prepend IP NLPID */
b06ebda0 MD	402	if (!m)
	403	ERROUT(ENOBUFS);
	404	mtod(m, u_char *)[0] = HDLC_UI;
	405	mtod(m, u_char *)[1] = NLPID_IP;
	406	break;
	407	case NG_RFC1490_ENCAP_IETF_SNAP:
	408	/*
	409	* According to RFC2427 frame should begin with
	410	* HDLC_UI PAD NLIPID OUI PID
	411	* 03 00 80 00 00 00 08 00
	412	*/
5a975a3d	413	M_PREPEND(m, 8, MB_DONTWAIT);
b06ebda0 MD	414	if (!m)
	415	ERROUT(ENOBUFS);
	416	mtod(m, u_char *)[0] = HDLC_UI;
	417	mtod(m, u_char )[1] = 0x00; / PAD */
	418	mtod(m, u_char *)[2] = NLPID_SNAP;
	419	bzero((char )(mtod(m, u_char ) + 3), 3); /* OUI 0-0-0 */
	420	((u_int16_t )mtod(m, u_int16_t *) + 6/sizeof(u_int16_t))
	421	= htons(ETHERTYPE_IP); /* PID */
	422	break;
	423	case NG_RFC1490_ENCAP_CISCO:
5a975a3d	424	M_PREPEND(m, 2, MB_DONTWAIT); /* Prepend IP ethertype */
b06ebda0 MD	425	if (!m)
	426	ERROUT(ENOBUFS);
	427	((u_int16_t )mtod(m, u_int16_t *)) = htons(ETHERTYPE_IP);
	428	break;
	429	}
	430	NG_FWD_NEW_DATA(error, item, priv->downlink, m);
	431	} else if (hook == priv->ethernet) {
5a975a3d	432	M_PREPEND(m, 8, MB_DONTWAIT); /* Prepend NLPID, OUI, PID */
b06ebda0 MD	433	if (!m)
	434	ERROUT(ENOBUFS);
	435	mtod(m, u_char *)[0] = HDLC_UI;
	436	mtod(m, u_char )[1] = 0x00; / pad */
	437	mtod(m, u_char *)[2] = NLPID_SNAP;
	438	mtod(m, u_char )[3] = 0x00; / OUI */
	439	mtod(m, u_char *)[4] = 0x80;
	440	mtod(m, u_char *)[5] = 0xc2;
	441	mtod(m, u_char )[6] = 0x00; / PID */
	442	mtod(m, u_char *)[7] = 0x07;
	443	NG_FWD_NEW_DATA(error, item, priv->downlink, m);
	444	} else
	445	panic(__func__);
	446
	447	done:
	448	if (item)
	449	NG_FREE_ITEM(item);
	450	NG_FREE_M(m);
	451	return (error);
	452	}
	453
	454	/*
	455	* Nuke node
	456	*/
	457	static int
	458	ng_rfc1490_shutdown(node_p node)
	459	{
	460	const priv_p priv = NG_NODE_PRIVATE(node);
	461
	462	/* Take down netgraph node */
	463	bzero(priv, sizeof(*priv));
fc025606	464	kfree(priv, M_NETGRAPH);
b06ebda0 MD	465	NG_NODE_SET_PRIVATE(node, NULL);
	466	NG_NODE_UNREF(node); /* let the node escape */
	467	return (0);
	468	}
	469
	470	/*
	471	* Hook disconnection
	472	*/
	473	static int
	474	ng_rfc1490_disconnect(hook_p hook)
	475	{
	476	const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
	477
	478	if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
	479	&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
	480	ng_rmnode_self(NG_HOOK_NODE(hook));
	481	else if (hook == priv->downlink)
	482	priv->downlink = NULL;
	483	else if (hook == priv->inet)
	484	priv->inet = NULL;
	485	else if (hook == priv->ppp)
	486	priv->ppp = NULL;
	487	else if (hook == priv->ethernet)
	488	priv->ethernet = NULL;
	489	else
	490	panic(__func__);
	491	return (0);
	492	}
	493