1 /* $OpenBSD: print-enc.c,v 1.7 2002/02/19 19:39:40 millert Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 */ 23 24 /* \summary: OpenBSD IPsec encapsulation BPF layer printer */ 25 26 #ifdef HAVE_CONFIG_H 27 #include "config.h" 28 #endif 29 30 #include <netdissect-stdinc.h> 31 32 #include "netdissect.h" 33 #include "extract.h" 34 35 /* From $OpenBSD: if_enc.h,v 1.8 2001/06/25 05:14:00 angelos Exp $ */ 36 /* 37 * The authors of this code are John Ioannidis (ji@tla.org), 38 * Angelos D. Keromytis (kermit@csd.uch.gr) and 39 * Niels Provos (provos@physnet.uni-hamburg.de). 40 * 41 * This code was written by John Ioannidis for BSD/OS in Athens, Greece, 42 * in November 1995. 43 * 44 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 45 * by Angelos D. Keromytis. 46 * 47 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 48 * and Niels Provos. 49 * 50 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis 51 * and Niels Provos. 52 * Copyright (c) 2001, Angelos D. Keromytis. 53 * 54 * Permission to use, copy, and modify this software with or without fee 55 * is hereby granted, provided that this entire notice is included in 56 * all copies of any software which is or includes a copy or 57 * modification of this software. 58 * You may use this code under the GNU public license if you so wish. Please 59 * contribute changes back to the authors under this freer than GPL license 60 * so that we may further the use of strong encryption without limitations to 61 * all. 62 * 63 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 64 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 65 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 66 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 67 * PURPOSE. 68 */ 69 70 #define ENC_HDRLEN 12 71 72 /* From $OpenBSD: mbuf.h,v 1.56 2002/01/25 15:50:23 art Exp $ */ 73 #define M_CONF 0x0400 /* packet was encrypted (ESP-transport) */ 74 #define M_AUTH 0x0800 /* packet was authenticated (AH) */ 75 76 struct enchdr { 77 uint32_t af; 78 uint32_t spi; 79 uint32_t flags; 80 }; 81 82 #define ENC_PRINT_TYPE(wh, xf, nam) \ 83 if ((wh) & (xf)) { \ 84 ND_PRINT((ndo, "%s%s", nam, (wh) == (xf) ? "): " : ",")); \ 85 (wh) &= ~(xf); \ 86 } 87 88 u_int 89 enc_if_print(netdissect_options *ndo, 90 const struct pcap_pkthdr *h, register const u_char *p) 91 { 92 register u_int length = h->len; 93 register u_int caplen = h->caplen; 94 int flags; 95 const struct enchdr *hdr; 96 97 if (caplen < ENC_HDRLEN) { 98 ND_PRINT((ndo, "[|enc]")); 99 goto out; 100 } 101 102 hdr = (const struct enchdr *)p; 103 flags = hdr->flags; 104 if (flags == 0) 105 ND_PRINT((ndo, "(unprotected): ")); 106 else 107 ND_PRINT((ndo, "(")); 108 ENC_PRINT_TYPE(flags, M_AUTH, "authentic"); 109 ENC_PRINT_TYPE(flags, M_CONF, "confidential"); 110 /* ENC_PRINT_TYPE(flags, M_TUNNEL, "tunnel"); */ 111 ND_PRINT((ndo, "SPI 0x%08x: ", EXTRACT_32BITS(&hdr->spi))); 112 113 length -= ENC_HDRLEN; 114 caplen -= ENC_HDRLEN; 115 p += ENC_HDRLEN; 116 117 switch (hdr->af) { 118 case AF_INET: 119 ip_print(ndo, p, length); 120 break; 121 #ifdef AF_INET6 122 case AF_INET6: 123 ip6_print(ndo, p, length); 124 break; 125 #endif 126 } 127 128 out: 129 return (ENC_HDRLEN); 130 } 131 132 133 /* 134 * Local Variables: 135 * c-style: whitesmith 136 * c-basic-offset: 8 137 * End: 138 */ 139