| /* |
| * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * Code by Matt Thomas, Digital Equipment Corporation |
| * with an awful lot of hacking by Jeffrey Mogul, DECWRL |
| */ |
| |
| #ifndef lint |
| static const char rcsid[] = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-llc.c,v 1.38 2001-06-04 05:47:14 guy Exp $"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <sys/param.h> |
| #include <sys/time.h> |
| |
| #include <netinet/in.h> |
| |
| #include <ctype.h> |
| #include <netdb.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "interface.h" |
| #include "addrtoname.h" |
| #include "extract.h" /* must come after interface.h */ |
| |
| #include "llc.h" |
| #include "ethertype.h" |
| |
| static struct tok cmd2str[] = { |
| { LLC_UI, "ui" }, |
| { LLC_TEST, "test" }, |
| { LLC_XID, "xid" }, |
| { LLC_UA, "ua" }, |
| { LLC_DISC, "disc" }, |
| { LLC_DM, "dm" }, |
| { LLC_SABME, "sabme" }, |
| { LLC_FRMR, "frmr" }, |
| { 0, NULL } |
| }; |
| |
| /* |
| * Returns non-zero IFF it succeeds in printing the header |
| */ |
| int |
| llc_print(const u_char *p, u_int length, u_int caplen, |
| const u_char *esrc, const u_char *edst, u_short *extracted_ethertype) |
| { |
| struct llc llc; |
| register u_short et; |
| u_int16_t control; |
| register int ret; |
| |
| if (caplen < 3) { |
| (void)printf("[|llc]"); |
| default_print((u_char *)p, caplen); |
| return(0); |
| } |
| |
| /* Watch out for possible alignment problems */ |
| memcpy((char *)&llc, (char *)p, min(caplen, sizeof(llc))); |
| |
| if (llc.ssap == LLCSAP_GLOBAL && llc.dsap == LLCSAP_GLOBAL) { |
| /* |
| * This is an Ethernet_802.3 IPX frame; it has an |
| * 802.3 header (i.e., an Ethernet header where the |
| * type/length field is <= ETHERMTU, i.e. it's a length |
| * field, not a type field), but has no 802.2 header - |
| * the IPX packet starts right after the Ethernet header, |
| * with a signature of two bytes of 0xFF (which is |
| * LLCSAP_GLOBAL). |
| */ |
| ipx_print(p, length); |
| return (1); |
| } |
| |
| if (llc.ssap == LLCSAP_8021D && llc.dsap == LLCSAP_8021D) { |
| stp_print(p, length); |
| return (1); |
| } |
| |
| if (llc.ssap == LLCSAP_IPX && llc.dsap == LLCSAP_IPX && |
| llc.llcui == LLC_UI) { |
| /* |
| * This is an Ethernet_802.2 IPX frame, with an 802.3 |
| * header and an 802.2 LLC header with the source and |
| * destination SAPs being the IPX SAP. |
| * |
| * Skip DSAP, LSAP, and control field. |
| */ |
| p += 3; |
| length -= 3; |
| caplen -= 3; |
| ipx_print(p, length); |
| return (1); |
| } |
| |
| if (llc.ssap == LLCSAP_NETBEUI && llc.dsap == LLCSAP_NETBEUI |
| && (!(llc.llcu & LLC_S_FMT) || llc.llcu == LLC_U_FMT)) { |
| /* |
| * we don't actually have a full netbeui parser yet, but the |
| * smb parser can handle many smb-in-netbeui packets, which |
| * is very useful, so we call that |
| * |
| * We don't call it for S frames, however, just I frames |
| * (which are frames that don't have the low-order bit, |
| * LLC_S_FMT, set in the first byte of the control field) |
| * and UI frames (whose control field is just 3, LLC_U_FMT). |
| */ |
| |
| /* |
| * Skip the DSAP and LSAP. |
| */ |
| p += 2; |
| length -= 2; |
| caplen -= 2; |
| |
| /* |
| * OK, what type of LLC frame is this? The length |
| * of the control field depends on that - I frames |
| * have a two-byte control field, and U frames have |
| * a one-byte control field. |
| */ |
| if (llc.llcu == LLC_U_FMT) { |
| control = llc.llcu; |
| p += 1; |
| length -= 1; |
| caplen -= 1; |
| } else { |
| /* |
| * The control field in I and S frames is |
| * little-endian. |
| */ |
| control = EXTRACT_LE_16BITS(&llc.llcu); |
| p += 2; |
| length -= 2; |
| caplen -= 2; |
| } |
| netbeui_print(control, p, length); |
| return (1); |
| } |
| if (llc.ssap == LLCSAP_ISONS && llc.dsap == LLCSAP_ISONS |
| && llc.llcui == LLC_UI) { |
| isoclns_print(p + 3, length - 3, caplen - 3, esrc, edst); |
| return (1); |
| } |
| |
| if (llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP |
| && llc.llcui == LLC_UI) { |
| u_int32_t orgcode; |
| |
| if (caplen < sizeof(llc)) { |
| (void)printf("[|llc-snap]"); |
| default_print((u_char *)p, caplen); |
| return (0); |
| } |
| if (vflag) |
| (void)printf("snap %s ", protoid_string(llc.llcpi)); |
| |
| caplen -= sizeof(llc); |
| length -= sizeof(llc); |
| p += sizeof(llc); |
| |
| orgcode = EXTRACT_24BITS(&llc.llc_orgcode[0]); |
| et = EXTRACT_16BITS(&llc.llc_ethertype[0]); |
| switch (orgcode) { |
| case OUI_ENCAP_ETHER: |
| case OUI_CISCO_90: |
| /* |
| * This is an encapsulated Ethernet packet, |
| * or a packet bridged by some piece of |
| * Cisco hardware; the protocol ID is |
| * an Ethernet protocol type. |
| */ |
| ret = ether_encap_print(et, p, length, caplen, |
| extracted_ethertype); |
| if (ret) |
| return (ret); |
| break; |
| |
| case OUI_APPLETALK: |
| if (et == ETHERTYPE_ATALK) { |
| /* |
| * No, I have no idea why Apple used one |
| * of their own OUIs, rather than |
| * 0x000000, and an Ethernet packet |
| * type, for Appletalk data packets, |
| * but used 0x000000 and an Ethernet |
| * packet type for AARP packets. |
| */ |
| ret = ether_encap_print(et, p, length, caplen, |
| extracted_ethertype); |
| if (ret) |
| return (ret); |
| } |
| break; |
| |
| case OUI_CISCO: |
| if (et == ETHERTYPE_CISCO_CDP) { |
| cdp_print( p, length, caplen, esrc, edst); |
| return 1; |
| } |
| break; |
| } |
| } |
| |
| if ((llc.ssap & ~LLC_GSAP) == llc.dsap) { |
| if (eflag) |
| (void)printf("%s ", llcsap_string(llc.dsap)); |
| else |
| (void)printf("%s > %s %s ", |
| etheraddr_string(esrc), |
| etheraddr_string(edst), |
| llcsap_string(llc.dsap)); |
| } else { |
| if (eflag) |
| (void)printf("%s > %s ", |
| llcsap_string(llc.ssap & ~LLC_GSAP), |
| llcsap_string(llc.dsap)); |
| else |
| (void)printf("%s %s > %s %s ", |
| etheraddr_string(esrc), |
| llcsap_string(llc.ssap & ~LLC_GSAP), |
| etheraddr_string(edst), |
| llcsap_string(llc.dsap)); |
| } |
| |
| if ((llc.llcu & LLC_U_FMT) == LLC_U_FMT) { |
| u_int16_t cmd; |
| const char *m; |
| char f; |
| |
| cmd = LLC_U_CMD(llc.llcu); |
| m = tok2str(cmd2str, "%02x", cmd); |
| switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) { |
| case 0: f = 'C'; break; |
| case LLC_GSAP: f = 'R'; break; |
| case LLC_U_POLL: f = 'P'; break; |
| case LLC_GSAP|LLC_U_POLL: f = 'F'; break; |
| default: f = '?'; break; |
| } |
| |
| printf("%s/%c", m, f); |
| |
| p += 3; |
| length -= 3; |
| caplen -= 3; |
| |
| if ((llc.llcu & ~LLC_U_POLL) == LLC_XID) { |
| if (*p == LLC_XID_FI) { |
| printf(": %02x %02x", p[1], p[2]); |
| p += 3; |
| length -= 3; |
| caplen -= 3; |
| } |
| } |
| } else { |
| char f; |
| |
| /* |
| * The control field in I and S frames is little-endian. |
| */ |
| control = EXTRACT_LE_16BITS(&llc.llcu); |
| switch ((llc.ssap & LLC_GSAP) | (control & LLC_IS_POLL)) { |
| case 0: f = 'C'; break; |
| case LLC_GSAP: f = 'R'; break; |
| case LLC_IS_POLL: f = 'P'; break; |
| case LLC_GSAP|LLC_IS_POLL: f = 'F'; break; |
| default: f = '?'; break; |
| } |
| |
| if ((control & LLC_S_FMT) == LLC_S_FMT) { |
| static char *llc_s[] = { "rr", "rej", "rnr", "03" }; |
| (void)printf("%s (r=%d,%c)", |
| llc_s[LLC_S_CMD(control)], |
| LLC_IS_NR(control), |
| f); |
| } else { |
| (void)printf("I (s=%d,r=%d,%c)", |
| LLC_I_NS(control), |
| LLC_IS_NR(control), |
| f); |
| } |
| p += 4; |
| length -= 4; |
| caplen -= 4; |
| } |
| (void)printf(" len=%d", length); |
| return(1); |
| } |