1 /* 2 * Copyright (c) 2001 William C. Fenner. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code 7 * distributions retain the above copyright notice and this paragraph 8 * in its entirety, and (2) distributions including binary code include 9 * the above copyright notice and this paragraph in its entirety in 10 * the documentation or other materials provided with the distribution. 11 * The name of William C. Fenner may not be used to endorse or 12 * promote products derived from this software without specific prior 13 * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND 14 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 15 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 16 * FOR A PARTICULAR PURPOSE. 17 */ 18 19 #include <sys/cdefs.h> 20 #ifndef lint 21 __RCSID("$NetBSD: print-msdp.c,v 1.5 2017/01/24 23:29:14 christos Exp $"); 22 #endif 23 24 #ifdef HAVE_CONFIG_H 25 #include "config.h" 26 #endif 27 28 #include <netdissect-stdinc.h> 29 30 #include "netdissect.h" 31 #include "addrtoname.h" 32 #include "extract.h" 33 34 #define MSDP_TYPE_MAX 7 35 36 void 37 msdp_print(netdissect_options *ndo, const u_char *sp, u_int length) 38 { 39 unsigned int type, len; 40 41 ND_TCHECK2(*sp, 3); 42 /* See if we think we're at the beginning of a compound packet */ 43 type = *sp; 44 len = EXTRACT_16BITS(sp + 1); 45 if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX) 46 goto trunc; /* not really truncated, but still not decodable */ 47 ND_PRINT((ndo, " msdp:")); 48 while (length > 0) { 49 ND_TCHECK2(*sp, 3); 50 type = *sp; 51 len = EXTRACT_16BITS(sp + 1); 52 if (len > 1400 || ndo->ndo_vflag) 53 ND_PRINT((ndo, " [len %u]", len)); 54 if (len < 3) 55 goto trunc; 56 sp += 3; 57 length -= 3; 58 switch (type) { 59 case 1: /* IPv4 Source-Active */ 60 case 3: /* IPv4 Source-Active Response */ 61 if (type == 1) 62 ND_PRINT((ndo, " SA")); 63 else 64 ND_PRINT((ndo, " SA-Response")); 65 ND_TCHECK(*sp); 66 ND_PRINT((ndo, " %u entries", *sp)); 67 if ((u_int)((*sp * 12) + 8) < len) { 68 ND_PRINT((ndo, " [w/data]")); 69 if (ndo->ndo_vflag > 1) { 70 ND_PRINT((ndo, " ")); 71 ip_print(ndo, sp + *sp * 12 + 8 - 3, 72 len - (*sp * 12 + 8)); 73 } 74 } 75 break; 76 case 2: 77 ND_PRINT((ndo, " SA-Request")); 78 ND_TCHECK2(*sp, 5); 79 ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1))); 80 break; 81 case 4: 82 ND_PRINT((ndo, " Keepalive")); 83 if (len != 3) 84 ND_PRINT((ndo, "[len=%d] ", len)); 85 break; 86 case 5: 87 ND_PRINT((ndo, " Notification")); 88 break; 89 default: 90 ND_PRINT((ndo, " [type=%d len=%d]", type, len)); 91 break; 92 } 93 sp += (len - 3); 94 length -= (len - 3); 95 } 96 return; 97 trunc: 98 ND_PRINT((ndo, " [|msdp]")); 99 } 100 101 /* 102 * Local Variables: 103 * c-style: whitesmith 104 * c-basic-offset: 8 105 * End: 106 */ 107