2004-03-31 09:17:26 +00:00
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/* $OpenBSD: print-enc.c,v 1.7 2002/02/19 19:39:40 millert Exp $ */
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/*
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* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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2017-01-31 19:17:06 +00:00
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/* \summary: OpenBSD IPsec encapsulation BPF layer printer */
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2004-03-31 09:17:26 +00:00
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#ifdef HAVE_CONFIG_H
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2023-05-10 15:02:34 +00:00
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#include <config.h>
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2004-03-31 09:17:26 +00:00
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#endif
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2023-05-10 15:02:34 +00:00
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#include "netdissect-stdinc.h"
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2004-03-31 09:17:26 +00:00
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2023-05-10 15:02:34 +00:00
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#define ND_LONGJMP_FROM_TCHECK
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2017-01-31 19:17:06 +00:00
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#include "netdissect.h"
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2010-10-28 16:23:25 +00:00
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#include "extract.h"
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2023-05-10 15:02:34 +00:00
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#include "af.h"
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2004-03-31 09:17:26 +00:00
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2015-01-06 19:03:11 +00:00
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/* From $OpenBSD: if_enc.h,v 1.8 2001/06/25 05:14:00 angelos Exp $ */
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/*
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* The authors of this code are John Ioannidis (ji@tla.org),
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* Angelos D. Keromytis (kermit@csd.uch.gr) and
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* Niels Provos (provos@physnet.uni-hamburg.de).
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*
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* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
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* in November 1995.
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*
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* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
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* by Angelos D. Keromytis.
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*
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* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
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* and Niels Provos.
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*
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* Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
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* and Niels Provos.
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* Copyright (c) 2001, Angelos D. Keromytis.
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*
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* Permission to use, copy, and modify this software with or without fee
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* is hereby granted, provided that this entire notice is included in
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* all copies of any software which is or includes a copy or
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* modification of this software.
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* You may use this code under the GNU public license if you so wish. Please
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* contribute changes back to the authors under this freer than GPL license
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* so that we may further the use of strong encryption without limitations to
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* all.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*/
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#define ENC_HDRLEN 12
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/* From $OpenBSD: mbuf.h,v 1.56 2002/01/25 15:50:23 art Exp $ */
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#define M_CONF 0x0400 /* packet was encrypted (ESP-transport) */
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#define M_AUTH 0x0800 /* packet was authenticated (AH) */
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struct enchdr {
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2023-05-10 15:02:34 +00:00
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nd_uint32_t af;
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nd_uint32_t spi;
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nd_uint32_t flags;
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2015-01-06 19:03:11 +00:00
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};
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2004-03-31 09:17:26 +00:00
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2023-05-10 15:02:34 +00:00
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#define ENC_PRINT_TYPE(wh, xf, name) \
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2004-03-31 09:17:26 +00:00
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if ((wh) & (xf)) { \
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2023-05-10 15:02:34 +00:00
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ND_PRINT("%s%s", name, (wh) == (xf) ? "): " : ","); \
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2004-03-31 09:17:26 +00:00
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(wh) &= ~(xf); \
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}
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2023-05-10 15:02:34 +00:00
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/*
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* Byte-swap a 32-bit number.
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* ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
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* big-endian platforms.)
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*/
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#define SWAPLONG(y) \
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((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
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void
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2015-01-06 19:03:11 +00:00
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enc_if_print(netdissect_options *ndo,
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2023-05-10 15:02:34 +00:00
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const struct pcap_pkthdr *h, const u_char *p)
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2004-03-31 09:17:26 +00:00
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{
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2023-05-10 15:02:34 +00:00
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u_int length = h->len;
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u_int af, flags;
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2004-03-31 09:17:26 +00:00
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const struct enchdr *hdr;
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2023-05-10 15:02:34 +00:00
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ndo->ndo_protocol = "enc";
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ND_TCHECK_LEN(p, ENC_HDRLEN);
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ndo->ndo_ll_hdr_len += ENC_HDRLEN;
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2004-03-31 09:17:26 +00:00
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2017-01-31 19:17:06 +00:00
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hdr = (const struct enchdr *)p;
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2023-05-10 15:02:34 +00:00
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/*
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* The address family and flags fields are in the byte order
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* of the host that originally captured the traffic.
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*
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* To determine that, look at the address family. It's 32-bit,
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* it is not likely ever to be > 65535 (I doubt there will
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* ever be > 65535 address families and, so far, AF_ values have
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* not been allocated very sparsely) so it should not have the
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* upper 16 bits set, and it is not likely ever to be AF_UNSPEC,
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* i.e. it's not likely ever to be 0, so if it's byte-swapped,
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* it should have at least one of the upper 16 bits set.
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*
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* So if any of the upper 16 bits are set, we assume it, and
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* the flags field, are byte-swapped.
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*
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* The SPI field is always in network byte order, i.e. big-
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* endian.
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*/
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UNALIGNED_MEMCPY(&af, &hdr->af, sizeof (af));
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UNALIGNED_MEMCPY(&flags, &hdr->flags, sizeof (flags));
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if ((af & 0xFFFF0000) != 0) {
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af = SWAPLONG(af);
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flags = SWAPLONG(flags);
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}
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2004-03-31 09:17:26 +00:00
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if (flags == 0)
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2023-05-10 15:02:34 +00:00
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ND_PRINT("(unprotected): ");
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2004-03-31 09:17:26 +00:00
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else
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2023-05-10 15:02:34 +00:00
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ND_PRINT("(");
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2004-03-31 09:17:26 +00:00
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ENC_PRINT_TYPE(flags, M_AUTH, "authentic");
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ENC_PRINT_TYPE(flags, M_CONF, "confidential");
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/* ENC_PRINT_TYPE(flags, M_TUNNEL, "tunnel"); */
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2023-05-10 15:02:34 +00:00
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ND_PRINT("SPI 0x%08x: ", GET_BE_U_4(hdr->spi));
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2004-03-31 09:17:26 +00:00
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length -= ENC_HDRLEN;
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2009-03-21 16:23:46 +00:00
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p += ENC_HDRLEN;
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2015-01-06 19:03:11 +00:00
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2023-05-10 15:02:34 +00:00
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switch (af) {
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case BSD_AFNUM_INET:
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2015-01-06 19:03:11 +00:00
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ip_print(ndo, p, length);
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2009-03-21 16:23:46 +00:00
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break;
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2023-05-10 15:02:34 +00:00
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case BSD_AFNUM_INET6_BSD:
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case BSD_AFNUM_INET6_FREEBSD:
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case BSD_AFNUM_INET6_DARWIN:
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2015-01-06 19:03:11 +00:00
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ip6_print(ndo, p, length);
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2009-03-21 16:23:46 +00:00
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break;
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}
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2004-03-31 09:17:26 +00:00
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}
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