/* * 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 * * $FreeBSD$ * $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 #include #include #include #include #include #include #include #include #include #include #include #include #include /* * 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 /* Node private data */ struct ng_rfc1490_private { hook_p downlink; hook_p ppp; hook_p inet; }; 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; /* Node type descriptor */ static struct ng_type typestruct = { NG_ABI_VERSION, NG_RFC1490_NODE_TYPE, NULL, ng_rfc1490_constructor, ng_rfc1490_rcvmsg, ng_rfc1490_shutdown, ng_rfc1490_newhook, NULL, NULL, ng_rfc1490_rcvdata, ng_rfc1490_disconnect, NULL }; NETGRAPH_INIT(rfc1490, &typestruct); /************************************************************************ NETGRAPH NODE STUFF ************************************************************************/ /* * Node constructor */ static int ng_rfc1490_constructor(node_p node) { priv_p priv; /* Allocate private structure */ MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); if (priv == NULL) return (ENOMEM); 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 return (EINVAL); return (0); } /* * Receive a control message. We don't support any special ones. */ static int ng_rfc1490_rcvmsg(node_p node, item_p item, hook_p lasthook) { NG_FREE_ITEM(item); return (EINVAL); } /* * 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 * | | * --------------------------------- -------------- * | 0x08 | 0x81 |0xCC |0xCF | 0x00 |..01.... |..10.... * | | | | | 0x80 | | * Q.933 CLNP IP(*) PPP(*) SNAP ISO 8208 ISO 8208 * | (rfc1973) | Modulo 8 Modulo 128 * | | * -------------------- OUI * | | | * L2 ID L3 ID ------------------------- * | User |00-80-C2 |00-00-00 * | specified | | * | 0x70 PID Ethertype * | | | * ------------------- --------------... ---------- * |0x51 |0x4E | |0x4C |0x1 |0xB | |0x806 | * | | | | | | | | | * 7776 Q.922 Others 802.2 802.3 802.6 Others ARP(*) Others * * */ #define MAX_ENCAPS_HDR 8 #define ERROUT(x) do { error = (x); goto done; } while (0) #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->m_len < MAX_ENCAPS_HDR && !(m = m_pullup(m, MAX_ENCAPS_HDR)))) ERROUT(ENOBUFS); ptr = start = mtod(m, const u_char *); /* 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; 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 */ ERROUT(0); 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, M_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) { M_PREPEND(m, 2, M_DONTWAIT); /* Prepend IP NLPID */ if (!m) ERROUT(ENOBUFS); mtod(m, u_char *)[0] = HDLC_UI; mtod(m, u_char *)[1] = NLPID_IP; 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)); FREE(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 panic(__func__); return (0); }