* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ip6.c,v 1.30 2003-06-03 23:49:22 guy Exp $";
-#endif
-
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#ifdef INET6
-
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
-#include <stdio.h>
-#include <stdlib.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "ip6.h"
+#include "ipproto.h"
+
+/*
+ * Compute a V6-style checksum by building a pseudoheader.
+ */
+int
+nextproto6_cksum(const struct ip6_hdr *ip6, const uint8_t *data,
+ u_int len, u_int covlen, u_int next_proto)
+{
+ struct {
+ struct in6_addr ph_src;
+ struct in6_addr ph_dst;
+ uint32_t ph_len;
+ uint8_t ph_zero[3];
+ uint8_t ph_nxt;
+ } ph;
+ struct cksum_vec vec[2];
+
+ /* pseudo-header */
+ memset(&ph, 0, sizeof(ph));
+ UNALIGNED_MEMCPY(&ph.ph_src, &ip6->ip6_src, sizeof (struct in6_addr));
+ UNALIGNED_MEMCPY(&ph.ph_dst, &ip6->ip6_dst, sizeof (struct in6_addr));
+ ph.ph_len = htonl(len);
+ ph.ph_nxt = next_proto;
+
+ vec[0].ptr = (const uint8_t *)(void *)&ph;
+ vec[0].len = sizeof(ph);
+ vec[1].ptr = data;
+ vec[1].len = covlen;
+
+ return in_cksum(vec, 2);
+}
/*
* print an IP6 datagram.
*/
void
-ip6_print(register const u_char *bp, register u_int length)
+ip6_print(netdissect_options *ndo, const u_char *bp, u_int length)
{
register const struct ip6_hdr *ip6;
register int advance;
- register u_int len;
+ u_int len;
+ const u_char *ipend;
register const u_char *cp;
+ register u_int payload_len;
int nh;
int fragmented = 0;
u_int flow;
ip6 = (const struct ip6_hdr *)bp;
- TCHECK(*ip6);
+ ND_TCHECK(*ip6);
if (length < sizeof (struct ip6_hdr)) {
- (void)printf("truncated-ip6 %d", length);
+ ND_PRINT((ndo, "truncated-ip6 %u", length));
return;
}
- advance = sizeof(struct ip6_hdr);
- len = EXTRACT_16BITS(&ip6->ip6_plen);
- if (length < len + advance)
- (void)printf("truncated-ip6 - %d bytes missing!",
- len + advance - length);
+ if (!ndo->ndo_eflag)
+ ND_PRINT((ndo, "IP6 "));
+
+ if (IP6_VERSION(ip6) != 6) {
+ ND_PRINT((ndo,"version error: %u != 6", IP6_VERSION(ip6)));
+ return;
+ }
+
+ payload_len = EXTRACT_16BITS(&ip6->ip6_plen);
+ len = payload_len + sizeof(struct ip6_hdr);
+ if (length < len)
+ ND_PRINT((ndo, "truncated-ip6 - %u bytes missing!",
+ len - length));
+
+ if (ndo->ndo_vflag) {
+ flow = EXTRACT_32BITS(&ip6->ip6_flow);
+ ND_PRINT((ndo, "("));
+#if 0
+ /* rfc1883 */
+ if (flow & 0x0f000000)
+ ND_PRINT((ndo, "pri 0x%02x, ", (flow & 0x0f000000) >> 24));
+ if (flow & 0x00ffffff)
+ ND_PRINT((ndo, "flowlabel 0x%06x, ", flow & 0x00ffffff));
+#else
+ /* RFC 2460 */
+ if (flow & 0x0ff00000)
+ ND_PRINT((ndo, "class 0x%02x, ", (flow & 0x0ff00000) >> 20));
+ if (flow & 0x000fffff)
+ ND_PRINT((ndo, "flowlabel 0x%05x, ", flow & 0x000fffff));
+#endif
+
+ ND_PRINT((ndo, "hlim %u, next-header %s (%u) payload length: %u) ",
+ ip6->ip6_hlim,
+ tok2str(ipproto_values,"unknown",ip6->ip6_nxt),
+ ip6->ip6_nxt,
+ payload_len));
+ }
+
+ /*
+ * Cut off the snapshot length to the end of the IP payload.
+ */
+ ipend = bp + len;
+ if (ipend < ndo->ndo_snapend)
+ ndo->ndo_snapend = ipend;
cp = (const u_char *)ip6;
+ advance = sizeof(struct ip6_hdr);
nh = ip6->ip6_nxt;
- while (cp < snapend) {
+ while (cp < ndo->ndo_snapend && advance > 0) {
cp += advance;
+ len -= advance;
-#ifndef IPPROTO_SCTP
-#define IPPROTO_SCTP 132
-#endif
- if (cp == (const u_char *)(ip6 + 1)
- && nh != IPPROTO_TCP && nh != IPPROTO_UDP
- && nh != IPPROTO_SCTP) {
- (void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
- ip6addr_string(&ip6->ip6_dst));
+ if (cp == (const u_char *)(ip6 + 1) &&
+ nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
+ nh != IPPROTO_DCCP && nh != IPPROTO_SCTP) {
+ ND_PRINT((ndo, "%s > %s: ", ip6addr_string(ndo, &ip6->ip6_src),
+ ip6addr_string(ndo, &ip6->ip6_dst)));
}
switch (nh) {
case IPPROTO_HOPOPTS:
- advance = hbhopt_print(cp);
+ advance = hbhopt_print(ndo, cp);
nh = *cp;
break;
case IPPROTO_DSTOPTS:
- advance = dstopt_print(cp);
+ advance = dstopt_print(ndo, cp);
nh = *cp;
break;
case IPPROTO_FRAGMENT:
- advance = frag6_print(cp, (const u_char *)ip6);
- if (snapend <= cp + advance)
- goto end;
+ advance = frag6_print(ndo, cp, (const u_char *)ip6);
+ if (ndo->ndo_snapend <= cp + advance)
+ return;
nh = *cp;
fragmented = 1;
break;
-#ifndef IPPROTO_MOBILITY
-#define IPPROTO_MOBILITY 62
-#endif
+
+ case IPPROTO_MOBILITY_OLD:
case IPPROTO_MOBILITY:
/*
- * XXX - we don't use "advance"; is this
- * header always a final header?
+ * XXX - we don't use "advance"; the current
+ * "Mobility Support in IPv6" draft
+ * (draft-ietf-mobileip-ipv6-24) says that
+ * the next header field in a mobility header
+ * should be IPPROTO_NONE, but speaks of
+ * the possiblity of a future extension in
+ * which payload can be piggybacked atop a
+ * mobility header.
*/
- advance = mobility_print(cp, (const u_char *)ip6);
+ advance = mobility_print(ndo, cp, (const u_char *)ip6);
nh = *cp;
- goto end;
+ return;
case IPPROTO_ROUTING:
- advance = rt6_print(cp, (const u_char *)ip6);
+ advance = rt6_print(ndo, cp, (const u_char *)ip6);
nh = *cp;
break;
case IPPROTO_SCTP:
- sctp_print(cp, (const u_char *)ip6,
- len + sizeof(struct ip6_hdr) - (cp - bp));
- goto end;
+ sctp_print(ndo, cp, (const u_char *)ip6, len);
+ return;
+ case IPPROTO_DCCP:
+ dccp_print(ndo, cp, (const u_char *)ip6, len);
+ return;
case IPPROTO_TCP:
- tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
- (const u_char *)ip6, fragmented);
- goto end;
+ tcp_print(ndo, cp, len, (const u_char *)ip6, fragmented);
+ return;
case IPPROTO_UDP:
- udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
- (const u_char *)ip6, fragmented);
- goto end;
+ udp_print(ndo, cp, len, (const u_char *)ip6, fragmented);
+ return;
case IPPROTO_ICMPV6:
- icmp6_print(cp, (const u_char *)ip6, fragmented);
- goto end;
+ icmp6_print(ndo, cp, len, (const u_char *)ip6, fragmented);
+ return;
case IPPROTO_AH:
- advance = ah_print(cp);
+ advance = ah_print(ndo, cp);
nh = *cp;
break;
case IPPROTO_ESP:
{
int enh, padlen;
- advance = esp_print(cp, (const u_char *)ip6, &enh, &padlen);
- if (enh < 0)
- goto end;
+ advance = esp_print(ndo, cp, len, (const u_char *)ip6, &enh, &padlen);
nh = enh & 0xff;
len -= padlen;
break;
}
-#ifndef IPPROTO_IPCOMP
-#define IPPROTO_IPCOMP 108
-#endif
case IPPROTO_IPCOMP:
{
int enh;
- advance = ipcomp_print(cp, &enh);
- if (enh < 0)
- goto end;
+ advance = ipcomp_print(ndo, cp, &enh);
nh = enh & 0xff;
break;
}
-#ifndef IPPROTO_PIM
-#define IPPROTO_PIM 103
-#endif
case IPPROTO_PIM:
- pim_print(cp, len);
- goto end;
-#ifndef IPPROTO_OSPF
-#define IPPROTO_OSPF 89
-#endif
+ pim_print(ndo, cp, len, (const u_char *)ip6);
+ return;
+
case IPPROTO_OSPF:
- ospf6_print(cp, len);
- goto end;
+ ospf6_print(ndo, cp, len);
+ return;
+
case IPPROTO_IPV6:
- ip6_print(cp, len);
- goto end;
-#ifndef IPPROTO_IPV4
-#define IPPROTO_IPV4 4
-#endif
+ ip6_print(ndo, cp, len);
+ return;
+
case IPPROTO_IPV4:
- ip_print(cp, len);
- goto end;
- case IPPROTO_NONE:
- (void)printf("no next header");
- goto end;
+ ip_print(ndo, cp, len);
+ return;
- default:
- (void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
- goto end;
- }
- }
+ case IPPROTO_PGM:
+ pgm_print(ndo, cp, len, (const u_char *)ip6);
+ return;
- end:
+ case IPPROTO_GRE:
+ gre_print(ndo, cp, len);
+ return;
- flow = EXTRACT_32BITS(&ip6->ip6_flow);
-#if 0
- /* rfc1883 */
- if (flow & 0x0f000000)
- (void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
- if (flow & 0x00ffffff)
- (void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
-#else
- /* RFC 2460 */
- if (flow & 0x0ff00000)
- (void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
- if (flow & 0x000fffff)
- (void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
-#endif
+ case IPPROTO_RSVP:
+ rsvp_print(ndo, cp, len);
+ return;
- if (ip6->ip6_hlim <= 1)
- (void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
+ case IPPROTO_NONE:
+ ND_PRINT((ndo, "no next header"));
+ return;
- if (vflag) {
- printf(" (");
- (void)printf("len %d", len);
- if (ip6->ip6_hlim > 1)
- (void)printf(", hlim %d", (int)ip6->ip6_hlim);
- printf(")");
+ default:
+ ND_PRINT((ndo, "ip-proto-%d %d", nh, len));
+ return;
+ }
}
+
return;
trunc:
- (void)printf("[|ip6]");
+ ND_PRINT((ndo, "[|ip6]"));
}
-
-#endif /* INET6 */
projects / tcpdump / blobdiff