X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/c422d3ab0f6de2d38512a4566637bc47df291e74..8f94d68a09e1103353cc7d1133d6dfdf7d5a920d:/print-ip.c diff --git a/print-ip.c b/print-ip.c index a94ae30e..f3471c50 100644 --- a/print-ip.c +++ b/print-ip.c @@ -21,7 +21,7 @@ #ifndef lint static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.113 2002-09-05 21:25:41 guy Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.125 2003-05-21 08:39:57 hannes Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -339,6 +339,21 @@ in_cksum_shouldbe(u_int16_t sum, u_int16_t computed_sum) return shouldbe; } +#ifndef IP_MF +#define IP_MF 0x2000 +#endif /* IP_MF */ +#ifndef IP_DF +#define IP_DF 0x4000 +#endif /* IP_DF */ +#define IP_RES 0x8000 + +static struct tok ip_frag_values[] = { + { IP_MF, "+" }, + { IP_DF, "DF" }, + { IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */ + { 0, NULL } +}; + /* * print an IP datagram. */ @@ -351,32 +366,12 @@ ip_print(register const u_char *bp, register u_int length) u_char nh; int advance; struct protoent *proto; + u_int16_t sum, ip_sum; + const char *sep = ""; + + printf("IP%s ", (((*bp >> 4) & 0xf) == 4) ? "" : "%u", (*bp >> 4) & 0xf); /* print version if != 4 */ ip = (const struct ip *)bp; -#ifdef LBL_ALIGN - /* - * If the IP header is not aligned, copy into abuf. - */ - if ((long)ip & 3) { - static u_char *abuf = NULL; - static int didwarn = 0; - - if (abuf == NULL) { - abuf = (u_char *)malloc(snaplen); - if (abuf == NULL) - error("ip_print: malloc"); - } - memcpy((char *)abuf, (char *)ip, min(length, snaplen)); - snapend += abuf - (u_char *)ip; - packetp = abuf; - ip = (struct ip *)abuf; - /* We really want libpcap to give us aligned packets */ - if (!didwarn) { - warning("compensating for unaligned libpcap packets"); - ++didwarn; - } - } -#endif if ((u_char *)(ip + 1) > snapend) { printf("[|ip]"); return; @@ -391,16 +386,14 @@ ip_print(register const u_char *bp, register u_int length) return; } - len = ntohs(ip->ip_len); + len = EXTRACT_16BITS(&ip->ip_len); if (length < len) (void)printf("truncated-ip - %d bytes missing! ", len - length); len -= hlen; len0 = len; - printf("IP "); - - off = ntohs(ip->ip_off); + off = EXTRACT_16BITS(&ip->ip_off); if (vflag) { (void)printf("(tos 0x%x", (int)ip->ip_tos); @@ -419,11 +412,39 @@ ip_print(register const u_char *bp, register u_int length) } if (ip->ip_ttl >= 1) - (void)printf(", ttl %d", (int)ip->ip_ttl); + (void)printf(", ttl %3u", ip->ip_ttl); + + /* + * for the firewall guys, print id, offset. + * On all but the last stick a "+" in the flags portion. + * For unfragmented datagrams, note the don't fragment flag. + */ + + (void)printf(", id %u, offset %u, flags [%s]", + EXTRACT_16BITS(&ip->ip_id), + (off & 0x1fff) * 8, + bittok2str(ip_frag_values, "none", off & 0xe000 )); + + (void)printf(", length: %u", EXTRACT_16BITS(&ip->ip_len)); + + if ((hlen - sizeof(struct ip)) > 0) { + (void)printf(", optlength: %u (", hlen - (u_int)sizeof(struct ip)); + ip_optprint((u_char *)(ip + 1), hlen - sizeof(struct ip)); + printf(" )"); + } + + if ((u_char *)ip + hlen <= snapend) { + sum = in_cksum((const u_short *)ip, hlen, 0); + if (sum != 0) { + ip_sum = EXTRACT_16BITS(&ip->ip_sum); + (void)printf("%sbad cksum %x (->%x)!", sep, + ip_sum, + in_cksum_shouldbe(ip_sum, sum)); + sep = ", "; + } + } - if ((off & 0x3fff) == 0) - (void)printf(", id %d", (int)ntohs(ip->ip_id)); - (void)printf(", len %d) ", (int)ntohs(ip->ip_len)); + printf(") "); } /* @@ -498,7 +519,8 @@ again: break; case IPPROTO_ICMP: - icmp_print(cp, len, (const u_char *)ip); + /* pass on the MF bit plus the offset to detect fragments */ + icmp_print(cp, len, (const u_char *)ip, (off & 0x3fff)); break; #ifndef IPPROTO_IGRP @@ -549,6 +571,12 @@ again: break; #endif /*INET6*/ +#ifndef IPPROTO_RSVP +#define IPPROTO_RSVP 46 +#endif + case IPPROTO_RSVP: + rsvp_print(cp, len); + break; #ifndef IPPROTO_GRE #define IPPROTO_GRE 47 @@ -587,66 +615,24 @@ again: printf(" %d", len); break; } + } else { + /* Ultra quiet now means that all this stuff should be suppressed */ + if (qflag > 1) return; + + /* + * if this isn't the first frag, we're missing the + * next level protocol header. print the ip addr + * and the protocol. + */ + if (off & 0x1fff) { + (void)printf("%s > %s:", ipaddr_string(&ip->ip_src), + ipaddr_string(&ip->ip_dst)); + if ((proto = getprotobynumber(ip->ip_p)) != NULL) + (void)printf(" %s", proto->p_name); + else + (void)printf(" ip-proto-%d", ip->ip_p); + } } - - /* Ultra quiet now means that all this stuff should be suppressed */ - /* res 3-Nov-98 */ - if (qflag > 1) return; - - - /* - * for fragmented datagrams, print id:size@offset. On all - * but the last stick a "+". For unfragmented datagrams, note - * the don't fragment flag. - */ - len = len0; /* get the original length */ - if (off & 0x3fff) { - /* - * if this isn't the first frag, we're missing the - * next level protocol header. print the ip addr - * and the protocol. - */ - if (off & 0x1fff) { - (void)printf("%s > %s:", ipaddr_string(&ip->ip_src), - ipaddr_string(&ip->ip_dst)); - if ((proto = getprotobynumber(ip->ip_p)) != NULL) - (void)printf(" %s", proto->p_name); - else - (void)printf(" ip-proto-%d", ip->ip_p); - } -#ifndef IP_MF -#define IP_MF 0x2000 -#endif /* IP_MF */ -#ifndef IP_DF -#define IP_DF 0x4000 -#endif /* IP_DF */ - (void)printf(" (frag %d:%u@%d%s)", ntohs(ip->ip_id), len, - (off & 0x1fff) * 8, - (off & IP_MF)? "+" : ""); - - } else if (off & IP_DF) - (void)printf(" (DF)"); - - if (vflag) { - u_int16_t sum, ip_sum; - const char *sep = ""; - - if ((u_char *)ip + hlen <= snapend) { - sum = in_cksum((const u_short *)ip, hlen, 0); - if (sum != 0) { - ip_sum = ntohs(ip->ip_sum); - (void)printf("%sbad cksum %x (->%x)!", sep, - ip_sum, - in_cksum_shouldbe(ip_sum, sum)); - sep = ", "; - } - } - if ((hlen -= sizeof(struct ip)) > 0) { - (void)printf("%soptlen=%d", sep, hlen); - ip_optprint((u_char *)(ip + 1), hlen); - } - } - } void @@ -676,3 +662,4 @@ ipN_print(register const u_char *bp, register u_int length) } +