From 43775c98bdbe446ff68bfc14cd23d9f53625b95e Mon Sep 17 00:00:00 2001 From: rik Date: Tue, 28 Dec 2004 00:07:57 +0000 Subject: Add FR support to sppp (MFCronyx). Silence on: net@, current@, hackers@. No objections: joerg Requested by: by many (mostly Cronyx) users for a long long time. MFC after: 10 days PR: kern/21771, kern/66348 --- sys/net/if_spppfr.c | 634 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 634 insertions(+) create mode 100644 sys/net/if_spppfr.c (limited to 'sys/net/if_spppfr.c') diff --git a/sys/net/if_spppfr.c b/sys/net/if_spppfr.c new file mode 100644 index 0000000..0cd9fcb --- /dev/null +++ b/sys/net/if_spppfr.c @@ -0,0 +1,634 @@ +/* + * Synchronous Frame Relay link level subroutines. + * ANSI T1.617-compaible link management signaling + * implemented for Frame Relay mode. + * Cisco-type Frame Relay framing added, thanks Alex Tutubalin. + * Only one DLCI per channel for now. + * + * Copyright (C) 1994-2000 Cronyx Engineering. + * Author: Serge Vakulenko, + * + * Copyright (C) 1999-2004 Cronyx Engineering. + * Author: Kurakin Roman, + * + * This software is distributed with NO WARRANTIES, not even the implied + * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Authors grant any other persons or organisations a permission to use, + * modify and redistribute this software in source and binary forms, + * as long as this message is kept with the software, all derivative + * works or modified versions. + * + * $Cronyx Id: if_spppfr.c,v 1.1.2.10 2004/06/29 09:02:30 rik Exp $ + * $FreeBSD$ + */ + +#include + +#if defined(__FreeBSD__) && __FreeBSD__ >= 3 +#include "opt_inet.h" +#include "opt_inet6.h" +#include "opt_ipx.h" +#endif + +#ifdef NetBSD1_3 +# if NetBSD1_3 > 6 +# include "opt_inet.h" +# include "opt_inet6.h" +# include "opt_iso.h" +# endif +#endif + +#include +#include +#include +#include +#include +#include +#if defined(__FreeBSD__) && __FreeBSD__ >= 3 +#include +#endif +#include +#include + +#if defined (__OpenBSD__) +#include +#else +#include +#endif + +#include +#include +#include +#include +#include +#include +#include +#include + +#if defined (__NetBSD__) || defined (__OpenBSD__) +#include /* XXX for softnet */ +#endif + +#include + +#include +#ifdef INET +#include +#include +#endif + +#if defined (__FreeBSD__) || defined (__OpenBSD__) +# include +#else +# include +#endif + +#ifdef IPX +#include +#include +#endif + +#include + +/* + * Frame Relay. + */ +#define FR_UI 0x03 /* Unnumbered Information */ +#define FR_IP 0xCC /* IP protocol identifier */ +#define FR_PADDING 0x00 /* NLPID padding */ +#define FR_SIGNALING 0x08 /* Q.933/T1.617 signaling identifier */ +#define FR_SNAP 0x80 /* NLPID snap */ + +/* + * Header flags. + */ +#define FR_DE 0x02 /* discard eligibility */ +#define FR_FECN 0x04 /* forward notification */ +#define FR_BECN 0x08 /* backward notification */ + +/* + * Signaling message types. + */ +#define FR_MSG_ENQUIRY 0x75 /* status enquiry */ +#define FR_MSG_STATUS 0x7d /* status */ + +#define FR_ENQUIRY_SIZE 14 + +/* + * Message field types. + */ +#define FR_FLD_RTYPE 0x01 /* report type */ +#define FR_FLD_VERIFY 0x03 /* link verification */ +#define FR_FLD_PVC 0x07 /* PVC status */ +#define FR_FLD_LSHIFT5 0x95 /* locking shift 5 */ + +/* + * Report types. + */ +#define FR_RTYPE_FULL 0 /* full status */ +#define FR_RTYPE_SHORT 1 /* link verification only */ +#define FR_RTYPE_SINGLE 2 /* single PVC status */ + +/* PVC status field. */ +#define FR_DLCI_DELETE 0x04 /* PVC is deleted */ +#define FR_DLCI_ACTIVE 0x02 /* PVC is operational */ +#define FR_DLCI_NEW 0x08 /* PVC is new */ + +struct arp_req { + unsigned short htype; /* hardware type = ARPHRD_FRELAY */ + unsigned short ptype; /* protocol type = ETHERTYPE_IP */ + unsigned char halen; /* hardware address length = 2 */ + unsigned char palen; /* protocol address length = 4 */ + unsigned short op; /* ARP/RARP/InARP request/reply */ + unsigned short hsource; /* hardware source address */ + unsigned short psource1; /* protocol source */ + unsigned short psource2; + unsigned short htarget; /* hardware target address */ + unsigned short ptarget1; /* protocol target */ + unsigned short ptarget2; +} __packed; + +#if defined(__FreeBSD__) && __FreeBSD__ >= 3 && __FreeBSD_version < 501113 +#define SPP_FMT "%s%d: " +#define SPP_ARGS(ifp) (ifp)->if_name, (ifp)->if_unit +#else +#define SPP_FMT "%s: " +#define SPP_ARGS(ifp) (ifp)->if_xname +#endif + +/* almost every function needs these */ +#define STDDCL \ + struct ifnet *ifp = &sp->pp_if; \ + int debug = ifp->if_flags & IFF_DEBUG + +static void sppp_fr_arp (struct sppp *sp, struct arp_req *req, u_short addr); +static void sppp_fr_signal (struct sppp *sp, unsigned char *h, int len); + +void sppp_fr_input (struct sppp *sp, struct mbuf *m) +{ + STDDCL; + u_char *h = mtod (m, u_char*); + int isr = -1; + int dlci, hlen, proto; + + /* Get the DLCI number. */ + if (m->m_pkthdr.len < 10) { +bad: m_freem (m); + return; + } + dlci = (h[0] << 2 & 0x3f0) | (h[1] >> 4 & 0x0f); + + /* Process signaling packets. */ + if (dlci == 0) { + sppp_fr_signal (sp, h, m->m_pkthdr.len); + m_freem (m); + return; + } + + if (dlci != sp->fr_dlci) { + if (debug) + printf (SPP_FMT "Received packet from invalid DLCI %d\n", + SPP_ARGS(ifp), dlci); + goto bad; + } + + /* Process the packet. */ + if (ntohs (*(short*) (h+2)) == ETHERTYPE_IP) { + /* Prehistoric IP framing? */ + h[2] = FR_UI; + h[3] = FR_IP; + } + if (h[2] != FR_UI) { + if (debug) + printf (SPP_FMT "Invalid frame relay header flag 0x%02x\n", + SPP_ARGS(ifp), h[2]); + goto bad; + } + switch (h[3]) { + default: + if (debug) + printf (SPP_FMT "Unsupported NLPID 0x%02x\n", + SPP_ARGS(ifp), h[3]); + goto bad; + + case FR_PADDING: + if (h[4] != FR_SNAP) { + if (debug) + printf (SPP_FMT "Bad NLPID 0x%02x\n", + SPP_ARGS(ifp), h[4]); + goto bad; + } + if (h[5] || h[6] || h[7]) { + if (debug) + printf (SPP_FMT "Bad OID 0x%02x-0x%02x-0x%02x\n", + SPP_ARGS(ifp), + h[5], h[6], h[7]); + goto bad; + } + proto = ntohs (*(short*) (h+8)); + if (proto == ETHERTYPE_ARP) { + /* Process the ARP request. */ + if (m->m_pkthdr.len != 10 + sizeof (struct arp_req)) { + if (debug) + printf (SPP_FMT "Bad ARP request size = %d bytes\n", + SPP_ARGS(ifp), + m->m_pkthdr.len); + goto bad; + } + sppp_fr_arp (sp, (struct arp_req*) (h + 10), + h[0] << 8 | h[1]); + m_freem (m); + return; + } + hlen = 10; + break; + + case FR_IP: + proto = ETHERTYPE_IP; + hlen = 4; + break; + } + + /* Remove frame relay header. */ + m_adj (m, hlen); + + switch (proto) { + default: + ++ifp->if_noproto; +drop: ++ifp->if_ierrors; + ++ifp->if_iqdrops; + m_freem (m); + return; +#ifdef INET + case ETHERTYPE_IP: + isr = NETISR_IP; + break; +#endif +#ifdef IPX + case ETHERTYPE_IPX: + isr = NETISR_IPX; + break; +#endif +#ifdef NETATALK + case ETHERTYPE_AT: + isr = NETISR_ATALK; + break; +#endif + } + + if (! (ifp->if_flags & IFF_UP)) + goto drop; + + /* Check queue. */ + if (netisr_queue(isr, m)) { /* (0) on success. */ + if (debug) + log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n", + SPP_ARGS(ifp)); + } +} + +/* + * Add the frame relay header to the packet. + * For IP the header length is 4 bytes, + * for all other protocols - 10 bytes (RFC 1490). + */ +struct mbuf *sppp_fr_header (struct sppp *sp, struct mbuf *m, + int family) +{ + STDDCL; + u_char *h; + int type, hlen; + + /* Prepend the space for Frame Relay header. */ + hlen = (family == AF_INET) ? 4 : 10; + M_PREPEND (m, hlen, M_DONTWAIT); + if (! m) + return 0; + h = mtod (m, u_char*); + + /* Fill the header. */ + h[0] = sp->fr_dlci >> 2 & 0xfc; + h[1] = sp->fr_dlci << 4 | 1; + h[2] = FR_UI; + + switch (family) { + default: + if (debug) + printf (SPP_FMT "Cannot handle address family %d\n", + SPP_ARGS(ifp), family); + m_freem (m); + return 0; +#ifdef INET + case AF_INET: +#if 0 /* Crashes on fragmented packets */ + /* + * Set the discard eligibility bit, if: + * 1) no fragmentation + * 2) length > 400 bytes + * 3a) the protocol is UDP or + * 3b) TCP data (no control bits) + */ + { + struct ip *ip = (struct ip*) (h + hlen); + struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl); + + if (! (ip->ip_off & ~IP_DF) && ip->ip_len > 400 && + (ip->ip_p == IPPROTO_UDP || + ip->ip_p == IPPROTO_TCP && ! tcp->th_flags)) + h[1] |= FR_DE; + } +#endif + h[3] = FR_IP; + return m; +#endif +#ifdef IPX + case AF_IPX: + type = ETHERTYPE_IPX; + break; +#endif +#ifdef NS + case AF_NS: + type = 0x8137; + break; +#endif +#ifdef NETATALK + case AF_APPLETALK: + type = ETHERTYPE_AT; + break; +#endif + } + h[3] = FR_PADDING; + h[4] = FR_SNAP; + h[5] = 0; + h[6] = 0; + h[7] = 0; + *(short*) (h+8) = htons(type); + return m; +} + +/* + * Send periodical frame relay link verification messages via DLCI 0. + * Called every 10 seconds (default value of T391 timer is 10 sec). + * Every 6-th message is a full status request + * (default value of N391 counter is 6). + */ +void sppp_fr_keepalive (struct sppp *sp) +{ + STDDCL; + unsigned char *h, *p; + struct mbuf *m; + + MGETHDR (m, M_DONTWAIT, MT_DATA); + if (! m) + return; + m->m_pkthdr.rcvif = 0; + + h = mtod (m, u_char*); + p = h; + *p++ = 0; /* DLCI = 0 */ + *p++ = 1; + *p++ = FR_UI; + *p++ = FR_SIGNALING; /* NLPID = UNI call control */ + + *p++ = 0; /* call reference length = 0 */ + *p++ = FR_MSG_ENQUIRY; /* message type = status enquiry */ + + *p++ = FR_FLD_LSHIFT5; /* locking shift 5 */ + + *p++ = FR_FLD_RTYPE; /* report type field */ + *p++ = 1; /* report type length = 1 */ + if (sp->pp_seq[IDX_LCP] % 6) + *p++ = FR_RTYPE_SHORT; /* link verification only */ + else + *p++ = FR_RTYPE_FULL; /* full status needed */ + + if (sp->pp_seq[IDX_LCP] >= 255) + sp->pp_seq[IDX_LCP] = 0; + *p++ = FR_FLD_VERIFY; /* link verification type field */ + *p++ = 2; /* link verification field length = 2 */ + *p++ = ++sp->pp_seq[IDX_LCP]; /* our sequence number */ + *p++ = sp->pp_rseq[IDX_LCP]; /* last received sequence number */ + + m->m_pkthdr.len = m->m_len = p - h; + if (debug) + printf (SPP_FMT "send lmi packet, seq=%d, rseq=%d\n", + SPP_ARGS(ifp), (u_char) sp->pp_seq[IDX_LCP], + (u_char) sp->pp_rseq[IDX_LCP]); + + if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3)) + ++ifp->if_oerrors; +} + +/* + * Process the frame relay Inverse ARP request. + */ +static void sppp_fr_arp (struct sppp *sp, struct arp_req *req, + u_short his_hardware_address) +{ + STDDCL; + struct mbuf *m; + struct arp_req *reply; + u_char *h; + u_short my_hardware_address; + u_long his_ip_address, my_ip_address; + + if ((ntohs (req->htype) != ARPHRD_FRELAY || + ntohs (req->htype) != 16) || /* for BayNetworks routers */ + ntohs (req->ptype) != ETHERTYPE_IP) { + if (debug) + printf (SPP_FMT "Invalid ARP hardware/protocol type = 0x%x/0x%x\n", + SPP_ARGS(ifp), + ntohs (req->htype), ntohs (req->ptype)); + return; + } + if (req->halen != 2 || req->palen != 4) { + if (debug) + printf (SPP_FMT "Invalid ARP hardware/protocol address length = %d/%d\n", + SPP_ARGS(ifp), + req->halen, req->palen); + return; + } + switch (ntohs (req->op)) { + default: + if (debug) + printf (SPP_FMT "Invalid ARP op = 0x%x\n", + SPP_ARGS(ifp), ntohs (req->op)); + return; + + case ARPOP_INVREPLY: + /* Ignore. */ + return; + + case ARPOP_INVREQUEST: + my_hardware_address = ntohs (req->htarget); + his_ip_address = ntohs (req->psource1) << 16 | + ntohs (req->psource2); + my_ip_address = ntohs (req->ptarget1) << 16 | + ntohs (req->ptarget2); + break; + } + if (debug) + printf (SPP_FMT "got ARP request, source=0x%04x/%d.%d.%d.%d, target=0x%04x/%d.%d.%d.%d\n", + SPP_ARGS(ifp), ntohs (req->hsource), + (unsigned char) (his_ip_address >> 24), + (unsigned char) (his_ip_address >> 16), + (unsigned char) (his_ip_address >> 8), + (unsigned char) his_ip_address, + my_hardware_address, + (unsigned char) (my_ip_address >> 24), + (unsigned char) (my_ip_address >> 16), + (unsigned char) (my_ip_address >> 8), + (unsigned char) my_ip_address); + + sppp_get_ip_addrs (sp, &my_ip_address, 0, 0); + if (! my_ip_address) + return; /* nothing to reply */ + + if (debug) + printf (SPP_FMT "send ARP reply, source=0x%04x/%d.%d.%d.%d, target=0x%04x/%d.%d.%d.%d\n", + SPP_ARGS(ifp), my_hardware_address, + (unsigned char) (my_ip_address >> 24), + (unsigned char) (my_ip_address >> 16), + (unsigned char) (my_ip_address >> 8), + (unsigned char) my_ip_address, + his_hardware_address, + (unsigned char) (his_ip_address >> 24), + (unsigned char) (his_ip_address >> 16), + (unsigned char) (his_ip_address >> 8), + (unsigned char) his_ip_address); + + /* Send the Inverse ARP reply. */ + MGETHDR (m, M_DONTWAIT, MT_DATA); + 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; ppp_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; + } + } +} -- cgit v1.1