342 lines
9.3 KiB
C
342 lines
9.3 KiB
C
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/*
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* ng_rfc1490.c
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*
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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_rfc1490.c,v 1.22 1999/11/01 09:24:52 julian Exp $
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*/
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/*
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* This node does RFC 1490 multiplexing.
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*
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* NOTE: RFC 1490 is updated by RFC 2427.
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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/errno.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.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_rfc1490.h>
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/*
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* DEFINITIONS
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*/
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/* Q.922 stuff -- see RFC 1490 */
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#define HDLC_UI 0x03
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#define NLPID_IP 0xCC
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#define NLPID_PPP 0xCF
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#define NLPID_SNAP 0x80
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#define NLPID_Q933 0x08
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#define NLPID_CLNP 0x81
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#define NLPID_ESIS 0x82
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#define NLPID_ISIS 0x83
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/* Node private data */
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struct ng_rfc1490_private {
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hook_p downlink;
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hook_p ppp;
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hook_p inet;
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};
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typedef struct ng_rfc1490_private *priv_p;
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/* Netgraph node methods */
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static ng_constructor_t ng_rfc1490_constructor;
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static ng_rcvmsg_t ng_rfc1490_rcvmsg;
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static ng_shutdown_t ng_rfc1490_shutdown;
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static ng_newhook_t ng_rfc1490_newhook;
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static ng_rcvdata_t ng_rfc1490_rcvdata;
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static ng_disconnect_t ng_rfc1490_disconnect;
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/* Node type descriptor */
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static struct ng_type typestruct = {
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NG_ABI_VERSION,
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NG_RFC1490_NODE_TYPE,
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NULL,
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ng_rfc1490_constructor,
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ng_rfc1490_rcvmsg,
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ng_rfc1490_shutdown,
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ng_rfc1490_newhook,
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NULL,
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NULL,
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ng_rfc1490_rcvdata,
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ng_rfc1490_disconnect,
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NULL
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};
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NETGRAPH_INIT(rfc1490, &typestruct);
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/************************************************************************
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NETGRAPH NODE STUFF
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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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ng_rfc1490_constructor(node_p node)
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{
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priv_p priv;
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/* Allocate private structure */
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MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (priv == NULL)
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return (ENOMEM);
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NG_NODE_SET_PRIVATE(node, priv);
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/* Done */
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return (0);
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}
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/*
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* Give our ok for a hook to be added
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*/
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static int
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ng_rfc1490_newhook(node_p node, hook_p hook, const char *name)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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if (!strcmp(name, NG_RFC1490_HOOK_DOWNSTREAM)) {
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if (priv->downlink)
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return (EISCONN);
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priv->downlink = hook;
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} else if (!strcmp(name, NG_RFC1490_HOOK_PPP)) {
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if (priv->ppp)
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return (EISCONN);
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priv->ppp = hook;
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} else if (!strcmp(name, NG_RFC1490_HOOK_INET)) {
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if (priv->inet)
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return (EISCONN);
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priv->inet = hook;
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} else
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return (EINVAL);
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return (0);
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}
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/*
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* Receive a control message. We don't support any special ones.
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*/
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static int
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ng_rfc1490_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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NG_FREE_ITEM(item);
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return (EINVAL);
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}
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/*
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* Receive data on a hook and encapsulate according to RFC 1490.
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* Only those nodes marked (*) are supported by this routine so far.
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*
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* Q.922 control
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* |
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* |
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* --------------------------------------------
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* | 0x03 |
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* UI I Frame
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* | |
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* --------------------------------- --------------
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* | 0x08 | 0x81 |0xCC |0xCF | 0x00 |..01.... |..10....
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* | | | | | 0x80 | |
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* Q.933 CLNP IP(*) PPP(*) SNAP ISO 8208 ISO 8208
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* | (rfc1973) | Modulo 8 Modulo 128
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* | |
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* -------------------- OUI
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* | | |
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* L2 ID L3 ID -------------------------
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* | User |00-80-C2 |00-00-00
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* | specified | |
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* | 0x70 PID Ethertype
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* | | |
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* ------------------- --------------... ----------
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* |0x51 |0x4E | |0x4C |0x1 |0xB | |0x806 |
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* | | | | | | | | |
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* 7776 Q.922 Others 802.2 802.3 802.6 Others ARP(*) Others
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*
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*
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*/
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#define MAX_ENCAPS_HDR 8
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#define ERROUT(x) do { error = (x); goto done; } while (0)
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#define OUICMP(P,A,B,C) ((P)[0]==(A) && (P)[1]==(B) && (P)[2]==(C))
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static int
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ng_rfc1490_rcvdata(hook_p hook, item_p item)
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{
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const node_p node = NG_HOOK_NODE(hook);
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const priv_p priv = NG_NODE_PRIVATE(node);
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int error = 0;
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struct mbuf *m;
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NGI_GET_M(item, m);
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if (hook == priv->downlink) {
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const u_char *start;
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const u_char *ptr;
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if (!m || (m->m_len < MAX_ENCAPS_HDR
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&& !(m = m_pullup(m, MAX_ENCAPS_HDR))))
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ERROUT(ENOBUFS);
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ptr = start = mtod(m, const u_char *);
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/* Must be UI frame */
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if (*ptr++ != HDLC_UI)
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ERROUT(0);
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/* Eat optional zero pad byte */
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if (*ptr == 0x00)
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ptr++;
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/* Multiplex on NLPID */
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switch (*ptr++) {
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case NLPID_SNAP:
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if (OUICMP(ptr, 0, 0, 0)) { /* It's an ethertype */
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u_int16_t etype;
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ptr += 3;
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etype = ntohs(*((const u_int16_t *)ptr));
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ptr += 2;
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m_adj(m, ptr - start);
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switch (etype) {
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case ETHERTYPE_IP:
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NG_FWD_NEW_DATA(error, item,
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priv->inet, m);
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break;
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case ETHERTYPE_ARP:
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case ETHERTYPE_REVARP:
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default:
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ERROUT(0);
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}
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} else if (OUICMP(ptr, 0x00, 0x80, 0xc2)) /* 802.1 bridging */
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ERROUT(0);
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else /* Other weird stuff... */
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ERROUT(0);
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break;
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case NLPID_IP:
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m_adj(m, ptr - start);
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NG_FWD_NEW_DATA(error, item, priv->inet, m);
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break;
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case NLPID_PPP:
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m_adj(m, ptr - start);
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NG_FWD_NEW_DATA(error, item, priv->ppp, m);
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break;
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case NLPID_Q933:
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case NLPID_CLNP:
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case NLPID_ESIS:
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case NLPID_ISIS:
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ERROUT(0);
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default: /* Try PPP (see RFC 1973) */
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ptr--; /* NLPID becomes PPP proto */
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if ((*ptr & 0x01) == 0x01)
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ERROUT(0);
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m_adj(m, ptr - start);
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NG_FWD_NEW_DATA(error, item, priv->ppp, m);
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break;
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}
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} else if (hook == priv->ppp) {
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M_PREPEND(m, 2, M_DONTWAIT); /* Prepend PPP NLPID */
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if (!m)
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ERROUT(ENOBUFS);
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mtod(m, u_char *)[0] = HDLC_UI;
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mtod(m, u_char *)[1] = NLPID_PPP;
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NG_FWD_NEW_DATA(error, item, priv->downlink, m);
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} else if (hook == priv->inet) {
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M_PREPEND(m, 2, M_DONTWAIT); /* Prepend IP NLPID */
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if (!m)
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ERROUT(ENOBUFS);
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mtod(m, u_char *)[0] = HDLC_UI;
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mtod(m, u_char *)[1] = NLPID_IP;
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NG_FWD_NEW_DATA(error, item, priv->downlink, m);
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} else
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panic(__func__);
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done:
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if (item)
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NG_FREE_ITEM(item);
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NG_FREE_M(m);
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return (error);
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}
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/*
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* Nuke node
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*/
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static int
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ng_rfc1490_shutdown(node_p node)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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/* Take down netgraph node */
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bzero(priv, sizeof(*priv));
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FREE(priv, M_NETGRAPH);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_UNREF(node); /* let the node escape */
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return (0);
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}
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/*
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* Hook disconnection
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*/
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static int
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ng_rfc1490_disconnect(hook_p hook)
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{
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const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
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&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
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ng_rmnode_self(NG_HOOK_NODE(hook));
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else if (hook == priv->downlink)
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priv->downlink = NULL;
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else if (hook == priv->inet)
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priv->inet = NULL;
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else if (hook == priv->ppp)
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priv->ppp = NULL;
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else
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panic(__func__);
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return (0);
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}
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