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 1.6 2017/02/05 04:05:05 spz Exp $"); 22 #endif 23 24 /* \summary: Multicast Source Discovery Protocol (MSDP) 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 "addrtoname.h" 34 #include "extract.h" 35 36 #define MSDP_TYPE_MAX 7 37 38 void 39 msdp_print(netdissect_options *ndo, const u_char *sp, u_int length) 40 { 41 unsigned int type, len; 42 43 ND_TCHECK2(*sp, 3); 44 /* See if we think we're at the beginning of a compound packet */ 45 type = *sp; 46 len = EXTRACT_16BITS(sp + 1); 47 if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX) 48 goto trunc; /* not really truncated, but still not decodable */ 49 ND_PRINT((ndo, " msdp:")); 50 while (length > 0) { 51 ND_TCHECK2(*sp, 3); 52 type = *sp; 53 len = EXTRACT_16BITS(sp + 1); 54 if (len > 1400 || ndo->ndo_vflag) 55 ND_PRINT((ndo, " [len %u]", len)); 56 if (len < 3) 57 goto trunc; 58 sp += 3; 59 length -= 3; 60 switch (type) { 61 case 1: /* IPv4 Source-Active */ 62 case 3: /* IPv4 Source-Active Response */ 63 if (type == 1) 64 ND_PRINT((ndo, " SA")); 65 else 66 ND_PRINT((ndo, " SA-Response")); 67 ND_TCHECK(*sp); 68 ND_PRINT((ndo, " %u entries", *sp)); 69 if ((u_int)((*sp * 12) + 8) < len) { 70 ND_PRINT((ndo, " [w/data]")); 71 if (ndo->ndo_vflag > 1) { 72 ND_PRINT((ndo, " ")); 73 ip_print(ndo, sp + *sp * 12 + 8 - 3, 74 len - (*sp * 12 + 8)); 75 } 76 } 77 break; 78 case 2: 79 ND_PRINT((ndo, " SA-Request")); 80 ND_TCHECK2(*sp, 5); 81 ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1))); 82 break; 83 case 4: 84 ND_PRINT((ndo, " Keepalive")); 85 if (len != 3) 86 ND_PRINT((ndo, "[len=%d] ", len)); 87 break; 88 case 5: 89 ND_PRINT((ndo, " Notification")); 90 break; 91 default: 92 ND_PRINT((ndo, " [type=%d len=%d]", type, len)); 93 break; 94 } 95 sp += (len - 3); 96 length -= (len - 3); 97 } 98 return; 99 trunc: 100 ND_PRINT((ndo, " [|msdp]")); 101 } 102 103 /* 104 * Local Variables: 105 * c-style: whitesmith 106 * c-basic-offset: 8 107 * End: 108 */ 109