1 /* $OpenBSD: print-frag6.c,v 1.4 2009/10/27 23:59:55 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994 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 #ifdef INET6 25 26 #include <sys/param.h> 27 #include <sys/time.h> 28 #include <sys/types.h> 29 #include <sys/socket.h> 30 31 #include <net/if.h> 32 33 #include <netinet/in.h> 34 #include <netinet/if_ether.h> 35 #include <netinet/in_systm.h> 36 #include <netinet/ip.h> 37 #include <netinet/ip_icmp.h> 38 #include <netinet/ip_var.h> 39 #include <netinet/udp.h> 40 #include <netinet/udp_var.h> 41 #include <netinet/tcp.h> 42 43 #include <stdio.h> 44 45 #include <netinet/ip6.h> 46 47 #include "interface.h" 48 #include "addrtoname.h" 49 50 int 51 frag6_print(register const u_char *bp, register const u_char *bp2) 52 { 53 register const struct ip6_frag *dp; 54 register const struct ip6_hdr *ip6; 55 register const u_char *ep; 56 57 #if 0 58 #define TCHECK(var) if ((u_char *)&(var) >= ep - sizeof(var)) goto trunc 59 #endif 60 61 dp = (struct ip6_frag *)bp; 62 ip6 = (struct ip6_hdr *)bp2; 63 64 /* 'ep' points to the end of avaible data. */ 65 ep = snapend; 66 67 TCHECK(dp->ip6f_offlg); 68 69 if (vflag) { 70 TCHECK(dp->ip6f_ident); 71 printf("frag (0x%08x:%d|%ld)", 72 ntohl(dp->ip6f_ident), 73 ntohs(dp->ip6f_offlg & IP6F_OFF_MASK), 74 sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - 75 (long)(bp - bp2) - sizeof(struct ip6_frag)); 76 } else { 77 printf("frag (%d|%ld)", 78 ntohs(dp->ip6f_offlg & IP6F_OFF_MASK), 79 sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - 80 (long)(bp - bp2) - sizeof(struct ip6_frag)); 81 } 82 83 /* it is meaningless to decode non-first fragment */ 84 if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0) 85 return 65535; 86 else 87 { 88 fputs(" ", stdout); 89 return sizeof(struct ip6_frag); 90 } 91 trunc: 92 fputs("[|frag]", stdout); 93 return 65535; 94 #undef TCHECK 95 } 96 #endif /* INET6 */ 97