635 lines
15 KiB
C
635 lines
15 KiB
C
/*-
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* Synchronous Frame Relay link level subroutines.
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* ANSI T1.617-compaible link management signaling
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* implemented for Frame Relay mode.
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* Cisco-type Frame Relay framing added, thanks Alex Tutubalin.
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* Only one DLCI per channel for now.
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*
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* Copyright (C) 1994-2000 Cronyx Engineering.
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* Author: Serge Vakulenko, <vak@cronyx.ru>
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*
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* Copyright (C) 1999-2004 Cronyx Engineering.
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* Author: Kurakin Roman, <rik@cronyx.ru>
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*
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* This software is distributed with NO WARRANTIES, not even the implied
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* warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Authors grant any other persons or organisations a permission to use,
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* modify and redistribute this software in source and binary forms,
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* as long as this message is kept with the software, all derivative
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* works or modified versions.
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*
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* $Cronyx Id: if_spppfr.c,v 1.1.2.10 2004/06/29 09:02:30 rik Exp $
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipx.h"
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#endif
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#ifdef NetBSD1_3
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# if NetBSD1_3 > 6
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# include "opt_inet.h"
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# include "opt_inet6.h"
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# include "opt_iso.h"
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# endif
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#endif
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/sockio.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#include <sys/random.h>
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#endif
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#if defined (__OpenBSD__)
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#include <sys/md5k.h>
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#else
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#include <sys/md5.h>
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#endif
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <net/slcompress.h>
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#if defined (__NetBSD__) || defined (__OpenBSD__)
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#include <machine/cpu.h> /* XXX for softnet */
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#endif
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#include <machine/stdarg.h>
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#include <netinet/in_var.h>
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#ifdef INET
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#endif
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#if defined (__FreeBSD__) || defined (__OpenBSD__)
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# include <netinet/if_ether.h>
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#else
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# include <net/ethertypes.h>
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#endif
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#ifdef IPX
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#include <netipx/ipx.h>
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#include <netipx/ipx_if.h>
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#endif
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#include <net/if_sppp.h>
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/*
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* Frame Relay.
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*/
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#define FR_UI 0x03 /* Unnumbered Information */
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#define FR_IP 0xCC /* IP protocol identifier */
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#define FR_PADDING 0x00 /* NLPID padding */
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#define FR_SIGNALING 0x08 /* Q.933/T1.617 signaling identifier */
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#define FR_SNAP 0x80 /* NLPID snap */
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/*
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* Header flags.
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*/
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#define FR_DE 0x02 /* discard eligibility */
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#define FR_FECN 0x04 /* forward notification */
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#define FR_BECN 0x08 /* backward notification */
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/*
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* Signaling message types.
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*/
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#define FR_MSG_ENQUIRY 0x75 /* status enquiry */
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#define FR_MSG_STATUS 0x7d /* status */
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#define FR_ENQUIRY_SIZE 14
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/*
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* Message field types.
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*/
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#define FR_FLD_RTYPE 0x01 /* report type */
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#define FR_FLD_VERIFY 0x03 /* link verification */
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#define FR_FLD_PVC 0x07 /* PVC status */
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#define FR_FLD_LSHIFT5 0x95 /* locking shift 5 */
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/*
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* Report types.
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*/
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#define FR_RTYPE_FULL 0 /* full status */
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#define FR_RTYPE_SHORT 1 /* link verification only */
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#define FR_RTYPE_SINGLE 2 /* single PVC status */
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/* PVC status field. */
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#define FR_DLCI_DELETE 0x04 /* PVC is deleted */
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#define FR_DLCI_ACTIVE 0x02 /* PVC is operational */
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#define FR_DLCI_NEW 0x08 /* PVC is new */
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struct arp_req {
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unsigned short htype; /* hardware type = ARPHRD_FRELAY */
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unsigned short ptype; /* protocol type = ETHERTYPE_IP */
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unsigned char halen; /* hardware address length = 2 */
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unsigned char palen; /* protocol address length = 4 */
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unsigned short op; /* ARP/RARP/InARP request/reply */
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unsigned short hsource; /* hardware source address */
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unsigned short psource1; /* protocol source */
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unsigned short psource2;
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unsigned short htarget; /* hardware target address */
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unsigned short ptarget1; /* protocol target */
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unsigned short ptarget2;
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} __packed;
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3 && __FreeBSD_version < 501113
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#define SPP_FMT "%s%d: "
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#define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit
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#else
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#define SPP_FMT "%s: "
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#define SPP_ARGS(ifp) (ifp)->if_xname
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#endif
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/* almost every function needs these */
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#define STDDCL \
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struct ifnet *ifp = &sp->pp_if; \
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int debug = ifp->if_flags & IFF_DEBUG
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static void sppp_fr_arp (struct sppp *sp, struct arp_req *req, u_short addr);
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static void sppp_fr_signal (struct sppp *sp, unsigned char *h, int len);
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void sppp_fr_input (struct sppp *sp, struct mbuf *m)
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{
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STDDCL;
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u_char *h = mtod (m, u_char*);
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int isr = -1;
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int dlci, hlen, proto;
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/* Get the DLCI number. */
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if (m->m_pkthdr.len < 10) {
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bad: m_freem (m);
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return;
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}
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dlci = (h[0] << 2 & 0x3f0) | (h[1] >> 4 & 0x0f);
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/* Process signaling packets. */
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if (dlci == 0) {
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sppp_fr_signal (sp, h, m->m_pkthdr.len);
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m_freem (m);
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return;
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}
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if (dlci != sp->fr_dlci) {
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if (debug)
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printf (SPP_FMT "Received packet from invalid DLCI %d\n",
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SPP_ARGS(ifp), dlci);
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goto bad;
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}
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/* Process the packet. */
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if (ntohs (*(short*) (h+2)) == ETHERTYPE_IP) {
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/* Prehistoric IP framing? */
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h[2] = FR_UI;
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h[3] = FR_IP;
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}
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if (h[2] != FR_UI) {
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if (debug)
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printf (SPP_FMT "Invalid frame relay header flag 0x%02x\n",
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SPP_ARGS(ifp), h[2]);
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goto bad;
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}
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switch (h[3]) {
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default:
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if (debug)
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printf (SPP_FMT "Unsupported NLPID 0x%02x\n",
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SPP_ARGS(ifp), h[3]);
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goto bad;
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case FR_PADDING:
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if (h[4] != FR_SNAP) {
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if (debug)
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printf (SPP_FMT "Bad NLPID 0x%02x\n",
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SPP_ARGS(ifp), h[4]);
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goto bad;
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}
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if (h[5] || h[6] || h[7]) {
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if (debug)
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printf (SPP_FMT "Bad OID 0x%02x-0x%02x-0x%02x\n",
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SPP_ARGS(ifp),
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h[5], h[6], h[7]);
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goto bad;
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}
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proto = ntohs (*(short*) (h+8));
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if (proto == ETHERTYPE_ARP) {
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/* Process the ARP request. */
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if (m->m_pkthdr.len != 10 + sizeof (struct arp_req)) {
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if (debug)
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printf (SPP_FMT "Bad ARP request size = %d bytes\n",
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SPP_ARGS(ifp),
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m->m_pkthdr.len);
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goto bad;
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}
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sppp_fr_arp (sp, (struct arp_req*) (h + 10),
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h[0] << 8 | h[1]);
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m_freem (m);
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return;
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}
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hlen = 10;
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break;
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case FR_IP:
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proto = ETHERTYPE_IP;
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hlen = 4;
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break;
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}
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/* Remove frame relay header. */
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m_adj (m, hlen);
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switch (proto) {
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default:
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++ifp->if_noproto;
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drop: ++ifp->if_ierrors;
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++ifp->if_iqdrops;
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m_freem (m);
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return;
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#ifdef INET
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case ETHERTYPE_IP:
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isr = NETISR_IP;
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break;
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#endif
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#ifdef IPX
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case ETHERTYPE_IPX:
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isr = NETISR_IPX;
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break;
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#endif
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#ifdef NETATALK
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case ETHERTYPE_AT:
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isr = NETISR_ATALK;
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break;
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#endif
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}
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if (! (ifp->if_flags & IFF_UP))
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goto drop;
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/* Check queue. */
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if (netisr_queue(isr, m)) { /* (0) on success. */
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if (debug)
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log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
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SPP_ARGS(ifp));
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}
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}
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/*
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* Add the frame relay header to the packet.
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* For IP the header length is 4 bytes,
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* for all other protocols - 10 bytes (RFC 1490).
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*/
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struct mbuf *sppp_fr_header (struct sppp *sp, struct mbuf *m,
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int family)
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{
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STDDCL;
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u_char *h;
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int type, hlen;
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/* Prepend the space for Frame Relay header. */
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hlen = (family == AF_INET) ? 4 : 10;
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M_PREPEND (m, hlen, M_DONTWAIT);
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if (! m)
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return 0;
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h = mtod (m, u_char*);
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/* Fill the header. */
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h[0] = sp->fr_dlci >> 2 & 0xfc;
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h[1] = sp->fr_dlci << 4 | 1;
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h[2] = FR_UI;
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switch (family) {
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default:
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if (debug)
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printf (SPP_FMT "Cannot handle address family %d\n",
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SPP_ARGS(ifp), family);
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m_freem (m);
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return 0;
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#ifdef INET
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case AF_INET:
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#if 0 /* Crashes on fragmented packets */
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/*
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* Set the discard eligibility bit, if:
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* 1) no fragmentation
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* 2) length > 400 bytes
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* 3a) the protocol is UDP or
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* 3b) TCP data (no control bits)
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*/
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{
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struct ip *ip = (struct ip*) (h + hlen);
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struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
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if (! (ip->ip_off & ~IP_DF) && ip->ip_len > 400 &&
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(ip->ip_p == IPPROTO_UDP ||
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ip->ip_p == IPPROTO_TCP && ! tcp->th_flags))
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h[1] |= FR_DE;
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}
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#endif
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h[3] = FR_IP;
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return m;
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#endif
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#ifdef IPX
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case AF_IPX:
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type = ETHERTYPE_IPX;
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break;
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#endif
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#ifdef NS
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case AF_NS:
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type = 0x8137;
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break;
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#endif
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#ifdef NETATALK
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case AF_APPLETALK:
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type = ETHERTYPE_AT;
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break;
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#endif
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}
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h[3] = FR_PADDING;
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h[4] = FR_SNAP;
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h[5] = 0;
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h[6] = 0;
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h[7] = 0;
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*(short*) (h+8) = htons(type);
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return m;
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}
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/*
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* Send periodical frame relay link verification messages via DLCI 0.
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* Called every 10 seconds (default value of T391 timer is 10 sec).
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* Every 6-th message is a full status request
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* (default value of N391 counter is 6).
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*/
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void sppp_fr_keepalive (struct sppp *sp)
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{
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STDDCL;
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unsigned char *h, *p;
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struct mbuf *m;
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MGETHDR (m, M_DONTWAIT, MT_DATA);
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if (! m)
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return;
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m->m_pkthdr.rcvif = 0;
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h = mtod (m, u_char*);
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p = h;
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*p++ = 0; /* DLCI = 0 */
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*p++ = 1;
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*p++ = FR_UI;
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*p++ = FR_SIGNALING; /* NLPID = UNI call control */
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*p++ = 0; /* call reference length = 0 */
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*p++ = FR_MSG_ENQUIRY; /* message type = status enquiry */
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*p++ = FR_FLD_LSHIFT5; /* locking shift 5 */
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*p++ = FR_FLD_RTYPE; /* report type field */
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*p++ = 1; /* report type length = 1 */
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if (sp->pp_seq[IDX_LCP] % 6)
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*p++ = FR_RTYPE_SHORT; /* link verification only */
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else
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*p++ = FR_RTYPE_FULL; /* full status needed */
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if (sp->pp_seq[IDX_LCP] >= 255)
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sp->pp_seq[IDX_LCP] = 0;
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*p++ = FR_FLD_VERIFY; /* link verification type field */
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*p++ = 2; /* link verification field length = 2 */
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*p++ = ++sp->pp_seq[IDX_LCP]; /* our sequence number */
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*p++ = sp->pp_rseq[IDX_LCP]; /* last received sequence number */
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m->m_pkthdr.len = m->m_len = p - h;
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if (debug)
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printf (SPP_FMT "send lmi packet, seq=%d, rseq=%d\n",
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SPP_ARGS(ifp), (u_char) sp->pp_seq[IDX_LCP],
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(u_char) sp->pp_rseq[IDX_LCP]);
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if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
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++ifp->if_oerrors;
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}
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/*
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* Process the frame relay Inverse ARP request.
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*/
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static void sppp_fr_arp (struct sppp *sp, struct arp_req *req,
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u_short his_hardware_address)
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{
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STDDCL;
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struct mbuf *m;
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struct arp_req *reply;
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u_char *h;
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u_short my_hardware_address;
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u_long his_ip_address, my_ip_address;
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if ((ntohs (req->htype) != ARPHRD_FRELAY ||
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ntohs (req->htype) != 16) || /* for BayNetworks routers */
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ntohs (req->ptype) != ETHERTYPE_IP) {
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if (debug)
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printf (SPP_FMT "Invalid ARP hardware/protocol type = 0x%x/0x%x\n",
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SPP_ARGS(ifp),
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ntohs (req->htype), ntohs (req->ptype));
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return;
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}
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if (req->halen != 2 || req->palen != 4) {
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if (debug)
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printf (SPP_FMT "Invalid ARP hardware/protocol address length = %d/%d\n",
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SPP_ARGS(ifp),
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req->halen, req->palen);
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return;
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}
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switch (ntohs (req->op)) {
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default:
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if (debug)
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printf (SPP_FMT "Invalid ARP op = 0x%x\n",
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SPP_ARGS(ifp), ntohs (req->op));
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return;
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case ARPOP_INVREPLY:
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/* Ignore. */
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return;
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case ARPOP_INVREQUEST:
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my_hardware_address = ntohs (req->htarget);
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his_ip_address = ntohs (req->psource1) << 16 |
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ntohs (req->psource2);
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my_ip_address = ntohs (req->ptarget1) << 16 |
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ntohs (req->ptarget2);
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break;
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}
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if (debug)
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printf (SPP_FMT "got ARP request, source=0x%04x/%d.%d.%d.%d, target=0x%04x/%d.%d.%d.%d\n",
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SPP_ARGS(ifp), ntohs (req->hsource),
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(unsigned char) (his_ip_address >> 24),
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(unsigned char) (his_ip_address >> 16),
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(unsigned char) (his_ip_address >> 8),
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(unsigned char) his_ip_address,
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my_hardware_address,
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(unsigned char) (my_ip_address >> 24),
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(unsigned char) (my_ip_address >> 16),
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(unsigned char) (my_ip_address >> 8),
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(unsigned char) my_ip_address);
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sppp_get_ip_addrs (sp, &my_ip_address, 0, 0);
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if (! my_ip_address)
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return; /* nothing to reply */
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if (debug)
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printf (SPP_FMT "send ARP reply, source=0x%04x/%d.%d.%d.%d, target=0x%04x/%d.%d.%d.%d\n",
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SPP_ARGS(ifp), my_hardware_address,
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(unsigned char) (my_ip_address >> 24),
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(unsigned char) (my_ip_address >> 16),
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(unsigned char) (my_ip_address >> 8),
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(unsigned char) my_ip_address,
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his_hardware_address,
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(unsigned char) (his_ip_address >> 24),
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(unsigned char) (his_ip_address >> 16),
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(unsigned char) (his_ip_address >> 8),
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(unsigned char) his_ip_address);
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/* Send the Inverse ARP reply. */
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MGETHDR (m, M_DONTWAIT, MT_DATA);
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|
if (! m)
|
|
return;
|
|
m->m_pkthdr.len = m->m_len = 10 + sizeof (*reply);
|
|
m->m_pkthdr.rcvif = 0;
|
|
|
|
h = mtod (m, u_char*);
|
|
reply = (struct arp_req*) (h + 10);
|
|
|
|
h[0] = his_hardware_address >> 8;
|
|
h[1] = his_hardware_address;
|
|
h[2] = FR_UI;
|
|
h[3] = FR_PADDING;
|
|
h[4] = FR_SNAP;
|
|
h[5] = 0;
|
|
h[6] = 0;
|
|
h[7] = 0;
|
|
*(short*) (h+8) = htons (ETHERTYPE_ARP);
|
|
|
|
reply->htype = htons (ARPHRD_FRELAY);
|
|
reply->ptype = htons (ETHERTYPE_IP);
|
|
reply->halen = 2;
|
|
reply->palen = 4;
|
|
reply->op = htons (ARPOP_INVREPLY);
|
|
reply->hsource = htons (my_hardware_address);
|
|
reply->psource1 = htonl (my_ip_address);
|
|
reply->psource2 = htonl (my_ip_address) >> 16;
|
|
reply->htarget = htons (his_hardware_address);
|
|
reply->ptarget1 = htonl (his_ip_address);
|
|
reply->ptarget2 = htonl (his_ip_address) >> 16;
|
|
|
|
if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
|
|
++ifp->if_oerrors;
|
|
}
|
|
|
|
/*
|
|
* Process the input signaling packet (DLCI 0).
|
|
* The implemented protocol is ANSI T1.617 Annex D.
|
|
*/
|
|
static void sppp_fr_signal (struct sppp *sp, unsigned char *h, int len)
|
|
{
|
|
STDDCL;
|
|
u_char *p;
|
|
int dlci;
|
|
|
|
if (h[2] != FR_UI || h[3] != FR_SIGNALING || h[4] != 0) {
|
|
if (debug)
|
|
printf (SPP_FMT "Invalid signaling header\n",
|
|
SPP_ARGS(ifp));
|
|
bad: if (debug) {
|
|
printf ("%02x", *h++);
|
|
while (--len > 0)
|
|
printf ("-%02x", *h++);
|
|
printf ("\n");
|
|
}
|
|
return;
|
|
}
|
|
if (h[5] == FR_MSG_ENQUIRY) {
|
|
if (len == FR_ENQUIRY_SIZE &&
|
|
h[12] == (u_char) sp->pp_seq[IDX_LCP]) {
|
|
sp->pp_seq[IDX_LCP] = random();
|
|
printf (SPP_FMT "loopback detected\n",
|
|
SPP_ARGS(ifp));
|
|
}
|
|
return;
|
|
}
|
|
if (h[5] != FR_MSG_STATUS) {
|
|
if (debug)
|
|
printf (SPP_FMT "Unknown signaling message: 0x%02x\n",
|
|
SPP_ARGS(ifp), h[5]);
|
|
goto bad;
|
|
}
|
|
|
|
/* Parse message fields. */
|
|
for (p=h+6; p<h+len; ) {
|
|
switch (*p) {
|
|
default:
|
|
if (debug)
|
|
printf (SPP_FMT "Unknown signaling field 0x%x\n",
|
|
SPP_ARGS(ifp), *p);
|
|
break;
|
|
case FR_FLD_LSHIFT5:
|
|
case FR_FLD_RTYPE:
|
|
/* Ignore. */
|
|
break;
|
|
case FR_FLD_VERIFY:
|
|
if (p[1] != 2) {
|
|
if (debug)
|
|
printf (SPP_FMT "Invalid signaling verify field length %d\n",
|
|
SPP_ARGS(ifp), p[1]);
|
|
break;
|
|
}
|
|
sp->pp_rseq[IDX_LCP] = p[2];
|
|
if (debug) {
|
|
printf (SPP_FMT "got lmi reply rseq=%d, seq=%d",
|
|
SPP_ARGS(ifp), p[2], p[3]);
|
|
if (p[3] != (u_char) sp->pp_seq[IDX_LCP])
|
|
printf (" (really %d)",
|
|
(u_char) sp->pp_seq[IDX_LCP]);
|
|
printf ("\n");
|
|
}
|
|
break;
|
|
case FR_FLD_PVC:
|
|
if (p[1] < 3) {
|
|
if (debug)
|
|
printf (SPP_FMT "Invalid PVC status length %d\n",
|
|
SPP_ARGS(ifp), p[1]);
|
|
break;
|
|
}
|
|
dlci = (p[2] << 4 & 0x3f0) | (p[3] >> 3 & 0x0f);
|
|
if (! sp->fr_dlci)
|
|
sp->fr_dlci = dlci;
|
|
if (sp->fr_status != p[4])
|
|
printf (SPP_FMT "DLCI %d %s%s\n",
|
|
SPP_ARGS(ifp), dlci,
|
|
p[4] & FR_DLCI_DELETE ? "deleted" :
|
|
p[4] & FR_DLCI_ACTIVE ? "active" : "passive",
|
|
p[4] & FR_DLCI_NEW ? ", new" : "");
|
|
sp->fr_status = p[4];
|
|
break;
|
|
}
|
|
if (*p & 0x80)
|
|
++p;
|
|
else if (p < h+len+1 && p[1])
|
|
p += 2 + p[1];
|
|
else {
|
|
if (debug)
|
|
printf (SPP_FMT "Invalid signaling field 0x%x\n",
|
|
SPP_ARGS(ifp), *p);
|
|
goto bad;
|
|
}
|
|
}
|
|
}
|