1 /* $OpenBSD: print-frag6.c,v 1.10 2020/01/24 22:46:36 procter 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 #include <sys/time.h> 25 #include <sys/types.h> 26 #include <sys/socket.h> 27 28 #include <net/if.h> 29 30 #include <netinet/in.h> 31 #include <netinet/if_ether.h> 32 #include <netinet/ip.h> 33 #include <netinet/ip_icmp.h> 34 #include <netinet/ip_var.h> 35 #include <netinet/udp.h> 36 #include <netinet/udp_var.h> 37 #include <netinet/tcp.h> 38 39 #include <stdio.h> 40 41 #include <netinet/ip6.h> 42 43 #include "interface.h" 44 #include "addrtoname.h" 45 46 int 47 frag6_print(const u_char *bp, const u_char *bp2) 48 { 49 const struct ip6_frag *dp; 50 const struct ip6_hdr *ip6; 51 const u_char *ep; 52 53 #if 0 54 #define TCHECK(var) if ((u_char *)&(var) >= ep - sizeof(var)) goto trunc 55 #endif 56 57 dp = (struct ip6_frag *)bp; 58 ip6 = (struct ip6_hdr *)bp2; 59 60 /* 'ep' points to the end of avaible data. */ 61 ep = snapend; 62 63 TCHECK(dp->ip6f_ident); 64 65 printf("frag (0x%08x:%ld@%d%s)", 66 ntohl(dp->ip6f_ident), 67 sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen) - 68 (long)(bp - bp2) - sizeof(struct ip6_frag), 69 ntohs(dp->ip6f_offlg & IP6F_OFF_MASK), 70 (dp->ip6f_offlg & IP6F_MORE_FRAG) ? "+" : ""); 71 72 /* it is meaningless to decode non-first fragment */ 73 if (ntohs(dp->ip6f_offlg & IP6F_OFF_MASK) != 0) 74 return 65535; 75 else 76 { 77 printf(" "); 78 return sizeof(struct ip6_frag); 79 } 80 trunc: 81 printf("[|frag]"); 82 return 65535; 83 #undef TCHECK 84 } 85