print-ospf6.c

来自「TCPDUMP的C语言源代码,是在数据链路层的应用」· C语言 代码 · 共 590 行 · 第 1/2 页

		lsapp = lsap->lsa_un.un_inter_ap.inter_ap_prefix;
		while (lsapp + sizeof(lsapp) <= (struct lsa6_prefix *)ls_end) {
			bytelen = ospf6_print_lsaprefix(lsapp);
			if (bytelen)
				goto trunc;
			lsapp = (struct lsa6_prefix *)(((u_char *)lsapp) + bytelen);
		}
		break;
	case LS_SCOPE_AS | LS_TYPE_ASE:
		TCHECK(lsap->lsa_un.un_asla.asla_metric);
		flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric);
                printf("\n\t     Flags [%s]",
                       bittok2str(ospf6_asla_flag_values, "none", flags32));
		printf(" metric %u",
		       EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) &
		       ASLA_MASK_METRIC);
		lsapp = lsap->lsa_un.un_asla.asla_prefix;
		bytelen = ospf6_print_lsaprefix(lsapp);
		if (bytelen < 0)
			goto trunc;
		if ((ls_opt = (u_char *)(((u_char *)lsapp) + bytelen)) < ls_end) {
			struct in6_addr *fwdaddr6;

			if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
				fwdaddr6 = (struct in6_addr *)ls_opt;
				TCHECK(*fwdaddr6);
				printf(" forward %s",
				       ip6addr_string(fwdaddr6));

				ls_opt += sizeof(struct in6_addr);
			}

			if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
				TCHECK(*(u_int32_t *)ls_opt);
				printf(" tag %s",
				       ipaddr_string((u_int32_t *)ls_opt));

				ls_opt += sizeof(u_int32_t);
			}

			if (lsapp->lsa_p_metric) {
				TCHECK(*(u_int32_t *)ls_opt);
				printf(" RefLSID: %s",
				       ipaddr_string((u_int32_t *)ls_opt));

				ls_opt += sizeof(u_int32_t);
			}
		}
		break;

	case LS_TYPE_LINK:
		/* Link LSA */
		llsap = &lsap->lsa_un.un_llsa;
		TCHECK(llsap->llsa_options);
                printf("\n\t      Options [%s]",
                       bittok2str(ospf6_option_values, "none",
                                  EXTRACT_32BITS(&llsap->llsa_options)));
		TCHECK(llsap->llsa_nprefix);
                prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix);
		printf("\n\t      Priority %d, Link-local address %s, Prefixes %d:",
                       llsap->llsa_priority,
                       ip6addr_string(&llsap->llsa_lladdr),
                       prefixes);

		tptr = (u_int8_t *)llsap->llsa_prefix;
                while (prefixes > 0) {
                    lsapp = (struct lsa6_prefix *)tptr;
                    if ((bytelen = ospf6_print_lsaprefix(lsapp)) == -1) {
                        goto trunc;
                    }
                    prefixes--;
                    tptr += bytelen;
                }
		break;

	case LS_TYPE_INTRA_AP | LS_SCOPE_AREA:
		/* Intra-Area-Prefix LSA */
		TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
		ospf6_print_ls_type(
			EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype),
			&lsap->lsa_un.un_intra_ap.intra_ap_lsid);
		TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
                prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
		printf("\n\t      Prefixes %d:", prefixes);

                tptr = (u_int8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;

                while (prefixes > 0) {
                    lsapp = (struct lsa6_prefix *)tptr;
                    if ((bytelen = ospf6_print_lsaprefix(lsapp)) == -1) {
                        goto trunc;
                    }
                    prefixes--;
                    tptr += bytelen;
                }
		break;

        case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
                if (ospf_print_grace_lsa(tptr, lsa_length) == -1) {
                    return 1;
                }
            
            break;

        case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
            if (ospf_print_te_lsa(tptr, lsa_length) == -1) {
                return 1;
            }
            break;

	default:
            if(!print_unknown_data(tptr,
                                   "\n\t      ",
                                   lsa_length)) {
                return (1);
            }
	}

	return (0);
trunc:
	return (1);
}

static int
ospf6_decode_v3(register const struct ospf6hdr *op,
    register const u_char *dataend)
{
	register const rtrid_t *ap;
	register const struct lsr6 *lsrp;
	register const struct lsa6_hdr *lshp;
	register const struct lsa6 *lsap;
	register int i;

	switch (op->ospf6_type) {

	case OSPF_TYPE_HELLO:
                printf("\n\tOptions [%s]",
                       bittok2str(ospf6_option_values, "none",
                                  EXTRACT_32BITS(&op->ospf6_hello.hello_options)));

                TCHECK(op->ospf6_hello.hello_deadint);
                printf("\n\t  Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
                       EXTRACT_16BITS(&op->ospf6_hello.hello_helloint),
                       EXTRACT_16BITS(&op->ospf6_hello.hello_deadint),
                       ipaddr_string(&op->ospf6_hello.hello_ifid),
                       op->ospf6_hello.hello_priority);

		TCHECK(op->ospf6_hello.hello_dr);
		if (op->ospf6_hello.hello_dr != 0)
			printf("\n\t  Designated Router %s",
			    ipaddr_string(&op->ospf6_hello.hello_dr));
		TCHECK(op->ospf6_hello.hello_bdr);
		if (op->ospf6_hello.hello_bdr != 0)
			printf(", Backup Designated Router %s",
			    ipaddr_string(&op->ospf6_hello.hello_bdr));
		if (vflag) {
			printf("\n\t  Neighbor List:");
			ap = op->ospf6_hello.hello_neighbor;
			while ((u_char *)ap < dataend) {
				TCHECK(*ap);
				printf("\n\t    %s", ipaddr_string(ap));
				++ap;
			}
		}
		break;	/* HELLO */

	case OSPF_TYPE_DD:
		TCHECK(op->ospf6_db.db_options);
                printf("\n\tOptions [%s]",
                       bittok2str(ospf6_option_values, "none",
                                  EXTRACT_32BITS(&op->ospf6_db.db_options)));
		TCHECK(op->ospf6_db.db_flags);
                printf(", DD Flags [%s]",
                       bittok2str(ospf6_dd_flag_values,"none",op->ospf6_db.db_flags));

		TCHECK(op->ospf6_db.db_seq);
		printf(", MTU %u, DD-Sequence 0x%08x",
                       EXTRACT_16BITS(&op->ospf6_db.db_mtu),
                       EXTRACT_32BITS(&op->ospf6_db.db_seq));

                /* Print all the LS adv's */
                lshp = op->ospf6_db.db_lshdr;
                while (!ospf6_print_lshdr(lshp)) {
                    ++lshp;
                }
		break;

	case OSPF_TYPE_LS_REQ:
		if (vflag) {
			lsrp = op->ospf6_lsr;
			while ((u_char *)lsrp < dataend) {
				TCHECK(*lsrp);
                                printf("\n\t  Advertising Router %s",
                                       ipaddr_string(&lsrp->ls_router));
				ospf6_print_ls_type(EXTRACT_16BITS(&lsrp->ls_type),
                                                    &lsrp->ls_stateid);
				++lsrp;
			}
		}
		break;

	case OSPF_TYPE_LS_UPDATE:
		if (vflag) {
			lsap = op->ospf6_lsu.lsu_lsa;
			TCHECK(op->ospf6_lsu.lsu_count);
			i = EXTRACT_32BITS(&op->ospf6_lsu.lsu_count);
			while (i--) {
				if (ospf6_print_lsa(lsap))
					goto trunc;
				lsap = (struct lsa6 *)((u_char *)lsap +
				    EXTRACT_16BITS(&lsap->ls_hdr.ls_length));
			}
		}
		break;


	case OSPF_TYPE_LS_ACK:
		if (vflag) {
			lshp = op->ospf6_lsa.lsa_lshdr;

			while (!ospf6_print_lshdr(lshp)) {
				++lshp;
			}
		}
		break;

	default:
		break;
	}
	return (0);
trunc:
	return (1);
}

void
ospf6_print(register const u_char *bp, register u_int length)
{
	register const struct ospf6hdr *op;
	register const u_char *dataend;
	register const char *cp;

	op = (struct ospf6hdr *)bp;

	/* If the type is valid translate it, or just print the type */
	/* value.  If it's not valid, say so and return */
	TCHECK(op->ospf6_type);
	cp = tok2str(ospf6_type_values, "unknown LS-type", op->ospf6_type);
	printf("OSPFv%u, %s, length %d", op->ospf6_version, cp, length);
	if (*cp == 'u') {
		return;
        }

        if(!vflag) { /* non verbose - so lets bail out here */
                return;
        }

	TCHECK(op->ospf6_len);
	if (length != EXTRACT_16BITS(&op->ospf6_len)) {
		printf(" [len %d]", EXTRACT_16BITS(&op->ospf6_len));
		return;
	}
	dataend = bp + length;

	/* Print the routerid if it is not the same as the source */
	TCHECK(op->ospf6_routerid);
	printf("\n\tRouter-ID %s", ipaddr_string(&op->ospf6_routerid));

	TCHECK(op->ospf6_areaid);
	if (op->ospf6_areaid != 0)
		printf(", Area %s", ipaddr_string(&op->ospf6_areaid));
	else
		printf(", Backbone Area");
	TCHECK(op->ospf6_instanceid);
	if (op->ospf6_instanceid)
		printf(", Instance %u", op->ospf6_instanceid);

	/* Do rest according to version.	 */
	switch (op->ospf6_version) {

	case 3:
		/* ospf version 3 */
		if (ospf6_decode_v3(op, dataend))
			goto trunc;
		break;

	default:
		printf(" ospf [version %d]", op->ospf6_version);
		break;
	}			/* end switch on version */

	return;
trunc:
	fputs(tstr, stdout);
}