ng_rfc1490.c revision 52752
152419Sjulian 252419Sjulian/* 352419Sjulian * ng_rfc1490.c 452419Sjulian * 552419Sjulian * Copyright (c) 1996-1999 Whistle Communications, Inc. 652419Sjulian * All rights reserved. 752419Sjulian * 852419Sjulian * Subject to the following obligations and disclaimer of warranty, use and 952419Sjulian * redistribution of this software, in source or object code forms, with or 1052419Sjulian * without modifications are expressly permitted by Whistle Communications; 1152419Sjulian * provided, however, that: 1252419Sjulian * 1. Any and all reproductions of the source or object code must include the 1352419Sjulian * copyright notice above and the following disclaimer of warranties; and 1452419Sjulian * 2. No rights are granted, in any manner or form, to use Whistle 1552419Sjulian * Communications, Inc. trademarks, including the mark "WHISTLE 1652419Sjulian * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 1752419Sjulian * such appears in the above copyright notice or in the software. 1852419Sjulian * 1952419Sjulian * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 2052419Sjulian * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 2152419Sjulian * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 2252419Sjulian * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 2352419Sjulian * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 2452419Sjulian * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 2552419Sjulian * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 2652419Sjulian * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 2752419Sjulian * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 2852419Sjulian * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 2952419Sjulian * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 3052419Sjulian * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 3152419Sjulian * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 3252419Sjulian * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3352419Sjulian * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3452419Sjulian * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 3552419Sjulian * OF SUCH DAMAGE. 3652419Sjulian * 3752419Sjulian * Author: Julian Elischer <julian@whistle.com> 3852419Sjulian * 3952419Sjulian * $FreeBSD: head/sys/netgraph/ng_rfc1490.c 52752 1999-11-01 10:00:40Z julian $ 4052752Sjulian * $Whistle: ng_rfc1490.c,v 1.22 1999/11/01 09:24:52 julian Exp $ 4152419Sjulian */ 4252419Sjulian 4352419Sjulian/* 4452419Sjulian * This node does RFC 1490 multiplexing. 4552419Sjulian * 4652419Sjulian * NOTE: RFC 1490 is updated by RFC 2427. 4752419Sjulian */ 4852419Sjulian 4952419Sjulian#include <sys/param.h> 5052419Sjulian#include <sys/systm.h> 5152419Sjulian#include <sys/errno.h> 5252419Sjulian#include <sys/kernel.h> 5352419Sjulian#include <sys/malloc.h> 5452419Sjulian#include <sys/mbuf.h> 5552419Sjulian#include <sys/conf.h> 5652419Sjulian#include <sys/errno.h> 5752419Sjulian#include <sys/socket.h> 5852419Sjulian#include <sys/syslog.h> 5952419Sjulian 6052419Sjulian#include <net/if.h> 6152419Sjulian#include <netinet/in.h> 6252419Sjulian#include <netinet/if_ether.h> 6352419Sjulian 6452419Sjulian#include <netgraph/ng_message.h> 6552419Sjulian#include <netgraph/netgraph.h> 6652419Sjulian#include <netgraph/ng_rfc1490.h> 6752419Sjulian 6852419Sjulian/* 6952419Sjulian * DEFINITIONS 7052419Sjulian */ 7152419Sjulian 7252419Sjulian/* Q.922 stuff -- see RFC 1490 */ 7352419Sjulian#define HDLC_UI 0x03 7452419Sjulian 7552419Sjulian#define NLPID_IP 0xCC 7652419Sjulian#define NLPID_PPP 0xCF 7752419Sjulian#define NLPID_SNAP 0x80 7852419Sjulian#define NLPID_Q933 0x08 7952419Sjulian#define NLPID_CLNP 0x81 8052419Sjulian#define NLPID_ESIS 0x82 8152419Sjulian#define NLPID_ISIS 0x83 8252419Sjulian 8352419Sjulian/* Node private data */ 8452419Sjulianstruct private { 8552419Sjulian hook_p downlink; 8652419Sjulian hook_p ppp; 8752419Sjulian hook_p inet; 8852419Sjulian}; 8952419Sjuliantypedef struct private *priv_p; 9052419Sjulian 9152419Sjulian/* Netgraph node methods */ 9252752Sjulianstatic ng_constructor_t ng_rfc1490_constructor; 9352752Sjulianstatic ng_rcvmsg_t ng_rfc1490_rcvmsg; 9452752Sjulianstatic ng_shutdown_t ng_rfc1490_rmnode; 9552752Sjulianstatic ng_newhook_t ng_rfc1490_newhook; 9652752Sjulianstatic ng_rcvdata_t ng_rfc1490_rcvdata; 9752752Sjulianstatic ng_disconnect_t ng_rfc1490_disconnect; 9852419Sjulian 9952419Sjulian/* Node type descriptor */ 10052419Sjulianstatic struct ng_type typestruct = { 10152419Sjulian NG_VERSION, 10252419Sjulian NG_RFC1490_NODE_TYPE, 10352419Sjulian NULL, 10452419Sjulian ng_rfc1490_constructor, 10552419Sjulian ng_rfc1490_rcvmsg, 10652419Sjulian ng_rfc1490_rmnode, 10752419Sjulian ng_rfc1490_newhook, 10852419Sjulian NULL, 10952419Sjulian NULL, 11052419Sjulian ng_rfc1490_rcvdata, 11152419Sjulian ng_rfc1490_rcvdata, 11252419Sjulian ng_rfc1490_disconnect 11352419Sjulian}; 11452419SjulianNETGRAPH_INIT(rfc1490, &typestruct); 11552419Sjulian 11652419Sjulian/************************************************************************ 11752419Sjulian NETGRAPH NODE STUFF 11852419Sjulian ************************************************************************/ 11952419Sjulian 12052419Sjulian/* 12152419Sjulian * Node constructor 12252419Sjulian */ 12352419Sjulianstatic int 12452419Sjulianng_rfc1490_constructor(node_p *nodep) 12552419Sjulian{ 12652419Sjulian priv_p priv; 12752419Sjulian int error; 12852419Sjulian 12952419Sjulian /* Allocate private structure */ 13052419Sjulian MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK); 13152419Sjulian if (priv == NULL) 13252419Sjulian return (ENOMEM); 13352419Sjulian bzero(priv, sizeof(*priv)); 13452419Sjulian 13552419Sjulian /* Call generic node constructor */ 13652419Sjulian if ((error = ng_make_node_common(&typestruct, nodep))) { 13752419Sjulian FREE(priv, M_NETGRAPH); 13852419Sjulian return (error); 13952419Sjulian } 14052419Sjulian (*nodep)->private = priv; 14152419Sjulian 14252419Sjulian /* Done */ 14352419Sjulian return (0); 14452419Sjulian} 14552419Sjulian 14652419Sjulian/* 14752419Sjulian * Give our ok for a hook to be added 14852419Sjulian */ 14952419Sjulianstatic int 15052419Sjulianng_rfc1490_newhook(node_p node, hook_p hook, const char *name) 15152419Sjulian{ 15252419Sjulian const priv_p priv = node->private; 15352419Sjulian 15452419Sjulian if (!strcmp(name, NG_RFC1490_HOOK_DOWNSTREAM)) { 15552419Sjulian if (priv->downlink) 15652419Sjulian return (EISCONN); 15752419Sjulian priv->downlink = hook; 15852419Sjulian } else if (!strcmp(name, NG_RFC1490_HOOK_PPP)) { 15952419Sjulian if (priv->ppp) 16052419Sjulian return (EISCONN); 16152419Sjulian priv->ppp = hook; 16252419Sjulian } else if (!strcmp(name, NG_RFC1490_HOOK_INET)) { 16352419Sjulian if (priv->inet) 16452419Sjulian return (EISCONN); 16552419Sjulian priv->inet = hook; 16652419Sjulian } else 16752419Sjulian return (EINVAL); 16852419Sjulian return (0); 16952419Sjulian} 17052419Sjulian 17152419Sjulian/* 17252419Sjulian * Receive a control message. We don't support any special ones. 17352419Sjulian */ 17452419Sjulianstatic int 17552419Sjulianng_rfc1490_rcvmsg(node_p node, struct ng_mesg *msg, 17652419Sjulian const char *raddr, struct ng_mesg **rp) 17752419Sjulian{ 17852419Sjulian FREE(msg, M_NETGRAPH); 17952419Sjulian return (EINVAL); 18052419Sjulian} 18152419Sjulian 18252419Sjulian/* 18352419Sjulian * Receive data on a hook and encapsulate according to RFC 1490. 18452419Sjulian * Only those nodes marked (*) are supported by this routine so far. 18552419Sjulian * 18652419Sjulian * Q.922 control 18752419Sjulian * | 18852419Sjulian * | 18952419Sjulian * -------------------------------------------- 19052419Sjulian * | 0x03 | 19152419Sjulian * UI I Frame 19252419Sjulian * | | 19352419Sjulian * --------------------------------- -------------- 19452419Sjulian * | 0x08 | 0x81 |0xCC |0xCF | 0x00 |..01.... |..10.... 19552419Sjulian * | | | | | 0x80 | | 19652419Sjulian * Q.933 CLNP IP(*) PPP(*) SNAP ISO 8208 ISO 8208 19752419Sjulian * | (rfc1973) | Modulo 8 Modulo 128 19852419Sjulian * | | 19952419Sjulian * -------------------- OUI 20052419Sjulian * | | | 20152419Sjulian * L2 ID L3 ID ------------------------- 20252419Sjulian * | User |00-80-C2 |00-00-00 20352419Sjulian * | specified | | 20452419Sjulian * | 0x70 PID Ethertype 20552419Sjulian * | | | 20652419Sjulian * ------------------- --------------... ---------- 20752419Sjulian * |0x51 |0x4E | |0x4C |0x1 |0xB | |0x806 | 20852419Sjulian * | | | | | | | | | 20952419Sjulian * 7776 Q.922 Others 802.2 802.3 802.6 Others ARP(*) Others 21052419Sjulian * 21152419Sjulian * 21252419Sjulian */ 21352419Sjulian 21452419Sjulian#define MAX_ENCAPS_HDR 8 21552419Sjulian#define ERROUT(x) do { error = (x); goto done; } while (0) 21652419Sjulian#define OUICMP(P,A,B,C) ((P)[0]==(A) && (P)[1]==(B) && (P)[2]==(C)) 21752419Sjulian 21852419Sjulianstatic int 21952419Sjulianng_rfc1490_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 22052419Sjulian{ 22152419Sjulian const node_p node = hook->node; 22252419Sjulian const priv_p priv = node->private; 22352419Sjulian int error = 0; 22452419Sjulian 22552419Sjulian if (hook == priv->downlink) { 22652419Sjulian u_char *start, *ptr; 22752419Sjulian 22852539Sjulian if (!m || (m->m_len < MAX_ENCAPS_HDR 22952539Sjulian && !(m = m_pullup(m, MAX_ENCAPS_HDR)))) 23052419Sjulian ERROUT(ENOBUFS); 23152419Sjulian ptr = start = mtod(m, u_char *); 23252419Sjulian 23352419Sjulian /* Must be UI frame */ 23452419Sjulian if (*ptr++ != HDLC_UI) 23552419Sjulian ERROUT(0); 23652419Sjulian 23752419Sjulian /* Eat optional zero pad byte */ 23852419Sjulian if (*ptr == 0x00) 23952419Sjulian ptr++; 24052419Sjulian 24152419Sjulian /* Multiplex on NLPID */ 24252419Sjulian switch (*ptr++) { 24352419Sjulian case NLPID_SNAP: 24452419Sjulian if (OUICMP(ptr, 0, 0, 0)) { /* It's an ethertype */ 24552419Sjulian u_int16_t etype; 24652419Sjulian 24752419Sjulian ptr += 3; 24852419Sjulian etype = ntohs(*((u_int16_t *) ptr)); 24952419Sjulian ptr += 2; 25052419Sjulian m_adj(m, ptr - start); 25152419Sjulian switch (etype) { 25252419Sjulian case ETHERTYPE_IP: 25352419Sjulian NG_SEND_DATA(error, 25452419Sjulian priv->inet, m, meta); 25552419Sjulian break; 25652419Sjulian case ETHERTYPE_ARP: 25752419Sjulian case ETHERTYPE_REVARP: 25852419Sjulian default: 25952419Sjulian ERROUT(0); 26052419Sjulian } 26152419Sjulian } else if (OUICMP(ptr, 0x00, 0x80, 0xc2)) /* 802.1 bridging */ 26252419Sjulian ERROUT(0); 26352419Sjulian else /* Other weird stuff... */ 26452419Sjulian ERROUT(0); 26552419Sjulian break; 26652419Sjulian case NLPID_IP: 26752419Sjulian m_adj(m, ptr - start); 26852419Sjulian NG_SEND_DATA(error, priv->inet, m, meta); 26952419Sjulian break; 27052419Sjulian case NLPID_PPP: 27152419Sjulian m_adj(m, ptr - start); 27252419Sjulian NG_SEND_DATA(error, priv->ppp, m, meta); 27352419Sjulian break; 27452419Sjulian case NLPID_Q933: 27552419Sjulian case NLPID_CLNP: 27652419Sjulian case NLPID_ESIS: 27752419Sjulian case NLPID_ISIS: 27852419Sjulian ERROUT(0); 27952419Sjulian default: /* Try PPP (see RFC 1973) */ 28052419Sjulian ptr--; /* NLPID becomes PPP proto */ 28152419Sjulian if ((*ptr & 0x01) == 0x01) 28252419Sjulian ERROUT(0); 28352419Sjulian m_adj(m, ptr - start); 28452419Sjulian NG_SEND_DATA(error, priv->ppp, m, meta); 28552419Sjulian break; 28652419Sjulian } 28752419Sjulian } else if (hook == priv->ppp) { 28852419Sjulian M_PREPEND(m, 2, M_DONTWAIT); /* Prepend PPP NLPID */ 28952419Sjulian if (!m) 29052419Sjulian ERROUT(ENOBUFS); 29152419Sjulian mtod(m, u_char *)[0] = HDLC_UI; 29252419Sjulian mtod(m, u_char *)[1] = NLPID_PPP; 29352419Sjulian NG_SEND_DATA(error, priv->downlink, m, meta); 29452419Sjulian } else if (hook == priv->inet) { 29552419Sjulian M_PREPEND(m, 2, M_DONTWAIT); /* Prepend IP NLPID */ 29652419Sjulian if (!m) 29752419Sjulian ERROUT(ENOBUFS); 29852419Sjulian mtod(m, u_char *)[0] = HDLC_UI; 29952419Sjulian mtod(m, u_char *)[1] = NLPID_IP; 30052419Sjulian NG_SEND_DATA(error, priv->downlink, m, meta); 30152419Sjulian } else 30252419Sjulian panic(__FUNCTION__); 30352419Sjulian 30452419Sjuliandone: 30552419Sjulian NG_FREE_DATA(m, meta); 30652419Sjulian return (error); 30752419Sjulian} 30852419Sjulian 30952419Sjulian/* 31052419Sjulian * Nuke node 31152419Sjulian */ 31252419Sjulianstatic int 31352419Sjulianng_rfc1490_rmnode(node_p node) 31452419Sjulian{ 31552419Sjulian const priv_p priv = node->private; 31652419Sjulian 31752419Sjulian /* Take down netgraph node */ 31852419Sjulian node->flags |= NG_INVALID; 31952419Sjulian ng_cutlinks(node); 32052419Sjulian ng_unname(node); 32152419Sjulian bzero(priv, sizeof(*priv)); 32252419Sjulian node->private = NULL; 32352419Sjulian ng_unref(node); /* let the node escape */ 32452419Sjulian return (0); 32552419Sjulian} 32652419Sjulian 32752419Sjulian/* 32852419Sjulian * Hook disconnection 32952419Sjulian */ 33052419Sjulianstatic int 33152419Sjulianng_rfc1490_disconnect(hook_p hook) 33252419Sjulian{ 33352419Sjulian const priv_p priv = hook->node->private; 33452419Sjulian 33552419Sjulian if (hook->node->numhooks == 0) 33652419Sjulian ng_rmnode(hook->node); 33752419Sjulian else if (hook == priv->downlink) 33852419Sjulian priv->downlink = NULL; 33952419Sjulian else if (hook == priv->inet) 34052419Sjulian priv->inet = NULL; 34152419Sjulian else if (hook == priv->ppp) 34252419Sjulian priv->ppp = NULL; 34352419Sjulian else 34452419Sjulian panic(__FUNCTION__); 34552419Sjulian return (0); 34652419Sjulian} 34752419Sjulian 348