/* * Copyright (c) 1998-2007 The TCPDUMP project * Copyright (c) 2009 Florian Forster * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code * distributions retain the above copyright notice and this paragraph * in its entirety, and (2) distributions including binary code include * the above copyright notice and this paragraph in its entirety in * the documentation or other materials provided with the distribution. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE. * * Optimized Link State Protocl (OLSR) as per rfc3626 * * Original code by Hannes Gredler <hannes@juniper.net> * IPv6 additions by Florian Forster <octo at verplant.org> */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include <tcpdump-stdinc.h> #include <stdio.h> #include <string.h> #include "interface.h" #include "addrtoname.h" #include "extract.h" #include "ip.h" /* * RFC 3626 common header * * 0 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Packet Length | Packet Sequence Number | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Message Type | Vtime | Message Size | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Originator Address | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Time To Live | Hop Count | Message Sequence Number | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | | * : MESSAGE : * | | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Message Type | Vtime | Message Size | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Originator Address | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Time To Live | Hop Count | Message Sequence Number | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | | * : MESSAGE : * | | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * : : */ struct olsr_common { u_int8_t packet_len[2]; u_int8_t packet_seq[2]; }; #define OLSR_HELLO_MSG 1 /* rfc3626 */ #define OLSR_TC_MSG 2 /* rfc3626 */ #define OLSR_MID_MSG 3 /* rfc3626 */ #define OLSR_HNA_MSG 4 /* rfc3626 */ #define OLSR_POWERINFO_MSG 128 #define OLSR_NAMESERVICE_MSG 130 #define OLSR_HELLO_LQ_MSG 201 /* LQ extensions olsr.org */ #define OLSR_TC_LQ_MSG 202 /* LQ extensions olsr.org */ static struct tok olsr_msg_values[] = { { OLSR_HELLO_MSG, "Hello" }, { OLSR_TC_MSG, "TC" }, { OLSR_MID_MSG, "MID" }, { OLSR_HNA_MSG, "HNA" }, { OLSR_POWERINFO_MSG, "Powerinfo" }, { OLSR_NAMESERVICE_MSG, "Nameservice" }, { OLSR_HELLO_LQ_MSG, "Hello-LQ" }, { OLSR_TC_LQ_MSG, "TC-LQ" }, { 0, NULL} }; struct olsr_msg4 { u_int8_t msg_type; u_int8_t vtime; u_int8_t msg_len[2]; u_int8_t originator[4]; u_int8_t ttl; u_int8_t hopcount; u_int8_t msg_seq[2]; }; struct olsr_msg6 { u_int8_t msg_type; u_int8_t vtime; u_int8_t msg_len[2]; u_int8_t originator[16]; u_int8_t ttl; u_int8_t hopcount; u_int8_t msg_seq[2]; }; struct olsr_hello { u_int8_t res[2]; u_int8_t htime; u_int8_t will; }; struct olsr_hello_link { u_int8_t link_code; u_int8_t res; u_int8_t len[2]; }; struct olsr_tc { u_int8_t ans_seq[2]; u_int8_t res[2]; }; struct olsr_hna4 { u_int8_t network[4]; u_int8_t mask[4]; }; struct olsr_hna6 { u_int8_t network[16]; u_int8_t mask[16]; }; #define OLSR_EXTRACT_LINK_TYPE(link_code) (link_code & 0x3) #define OLSR_EXTRACT_NEIGHBOR_TYPE(link_code) (link_code >> 2) static struct tok olsr_link_type_values[] = { { 0, "Unspecified" }, { 1, "Asymmetric" }, { 2, "Symmetric" }, { 3, "Lost" }, { 0, NULL} }; static struct tok olsr_neighbor_type_values[] = { { 0, "Not-Neighbor" }, { 1, "Symmetric" }, { 2, "Symmetric-MPR" }, { 0, NULL} }; struct olsr_lq_neighbor4 { u_int8_t neighbor[4]; u_int8_t link_quality; u_int8_t neighbor_link_quality; u_int8_t res[2]; }; struct olsr_lq_neighbor6 { u_int8_t neighbor[16]; u_int8_t link_quality; u_int8_t neighbor_link_quality; u_int8_t res[2]; }; /* * macro to convert the 8-bit mantissa/exponent to a double float * taken from olsr.org. */ #define VTIME_SCALE_FACTOR 0.0625 #define ME_TO_DOUBLE(me) \ (double)(VTIME_SCALE_FACTOR*(1+(double)(me>>4)/16)*(double)(1<<(me&0x0F))) /* * print a neighbor list with LQ extensions. */ static void olsr_print_lq_neighbor4 (const u_char *msg_data, u_int hello_len) { struct olsr_lq_neighbor4 *lq_neighbor; while (hello_len >= sizeof(struct olsr_lq_neighbor4)) { lq_neighbor = (struct olsr_lq_neighbor4 *)msg_data; printf("\n\t neighbor %s, link-quality %.2lf%%" ", neighbor-link-quality %.2lf%%", ipaddr_string(lq_neighbor->neighbor), ((double)lq_neighbor->link_quality/2.55), ((double)lq_neighbor->neighbor_link_quality/2.55)); msg_data += sizeof(struct olsr_lq_neighbor4); hello_len -= sizeof(struct olsr_lq_neighbor4); } } #if INET6 static void olsr_print_lq_neighbor6 (const u_char *msg_data, u_int hello_len) { struct olsr_lq_neighbor6 *lq_neighbor; while (hello_len >= sizeof(struct olsr_lq_neighbor6)) { lq_neighbor = (struct olsr_lq_neighbor6 *)msg_data; printf("\n\t neighbor %s, link-quality %.2lf%%" ", neighbor-link-quality %.2lf%%", ip6addr_string(lq_neighbor->neighbor), ((double)lq_neighbor->link_quality/2.55), ((double)lq_neighbor->neighbor_link_quality/2.55)); msg_data += sizeof(struct olsr_lq_neighbor6); hello_len -= sizeof(struct olsr_lq_neighbor6); } } #endif /* INET6 */ /* * print a neighbor list. */ static void olsr_print_neighbor (const u_char *msg_data, u_int hello_len) { int neighbor; printf("\n\t neighbor\n\t\t"); neighbor = 1; while (hello_len >= sizeof(struct in_addr)) { /* print 4 neighbors per line */ printf("%s%s", ipaddr_string(msg_data), neighbor % 4 == 0 ? "\n\t\t" : " "); msg_data += sizeof(struct in_addr); hello_len -= sizeof(struct in_addr); } } void olsr_print (const u_char *pptr, u_int length, int is_ipv6) { union { const struct olsr_common *common; const struct olsr_msg4 *msg4; const struct olsr_msg6 *msg6; const struct olsr_hello *hello; const struct olsr_hello_link *hello_link; const struct olsr_tc *tc; const struct olsr_hna4 *hna; } ptr; u_int msg_type, msg_len, msg_tlen, hello_len; u_int16_t name_entry_type, name_entry_len; u_int name_entry_padding; u_int8_t link_type, neighbor_type; const u_char *tptr, *msg_data; tptr = pptr; if (length < sizeof(struct olsr_common)) { goto trunc; } if (!TTEST2(*tptr, sizeof(struct olsr_common))) { goto trunc; } ptr.common = (struct olsr_common *)tptr; length = MIN(length, EXTRACT_16BITS(ptr.common->packet_len)); printf("OLSRv%i, seq 0x%04x, length %u", (is_ipv6 == 0) ? 4 : 6, EXTRACT_16BITS(ptr.common->packet_seq), length); tptr += sizeof(struct olsr_common); /* * In non-verbose mode, just print version. */ if (vflag < 1) { return; } while (tptr < (pptr+length)) { union { struct olsr_msg4 *v4; struct olsr_msg6 *v6; } msgptr; int msg_len_valid = 0; if (!TTEST2(*tptr, sizeof(struct olsr_msg4))) goto trunc; #if INET6 if (is_ipv6) { msgptr.v6 = (struct olsr_msg6 *) tptr; msg_type = msgptr.v6->msg_type; msg_len = EXTRACT_16BITS(msgptr.v6->msg_len); if ((msg_len >= sizeof (struct olsr_msg6)) && (msg_len <= length)) msg_len_valid = 1; /* infinite loop check */ if (msg_type == 0 || msg_len == 0) { return; } printf("\n\t%s Message (%#04x), originator %s, ttl %u, hop %u" "\n\t vtime %.3lfs, msg-seq 0x%04x, length %u%s", tok2str(olsr_msg_values, "Unknown", msg_type), msg_type, ip6addr_string(msgptr.v6->originator), msgptr.v6->ttl, msgptr.v6->hopcount, ME_TO_DOUBLE(msgptr.v6->vtime), EXTRACT_16BITS(msgptr.v6->msg_seq), msg_len, (msg_len_valid == 0) ? " (invalid)" : ""); msg_tlen = msg_len - sizeof(struct olsr_msg6); msg_data = tptr + sizeof(struct olsr_msg6); } else /* (!is_ipv6) */ #endif /* INET6 */ { msgptr.v4 = (struct olsr_msg4 *) tptr; msg_type = msgptr.v4->msg_type; msg_len = EXTRACT_16BITS(msgptr.v4->msg_len); if ((msg_len >= sizeof (struct olsr_msg4)) && (msg_len <= length)) msg_len_valid = 1; /* infinite loop check */ if (msg_type == 0 || msg_len == 0) { return; } printf("\n\t%s Message (%#04x), originator %s, ttl %u, hop %u" "\n\t vtime %.3lfs, msg-seq 0x%04x, length %u%s", tok2str(olsr_msg_values, "Unknown", msg_type), msg_type, ipaddr_string(msgptr.v4->originator), msgptr.v4->ttl, msgptr.v4->hopcount, ME_TO_DOUBLE(msgptr.v4->vtime), EXTRACT_16BITS(msgptr.v4->msg_seq), msg_len, (msg_len_valid == 0) ? " (invalid)" : ""); msg_tlen = msg_len - sizeof(struct olsr_msg4); msg_data = tptr + sizeof(struct olsr_msg4); } switch (msg_type) { case OLSR_HELLO_MSG: case OLSR_HELLO_LQ_MSG: if (!TTEST2(*msg_data, sizeof(struct olsr_hello))) goto trunc; ptr.hello = (struct olsr_hello *)msg_data; printf("\n\t hello-time %.3lfs, MPR willingness %u", ME_TO_DOUBLE(ptr.hello->htime), ptr.hello->will); msg_data += sizeof(struct olsr_hello); msg_tlen -= sizeof(struct olsr_hello); while (msg_tlen >= sizeof(struct olsr_hello_link)) { int hello_len_valid = 0; /* * link-type. */ if (!TTEST2(*msg_data, sizeof(struct olsr_hello_link))) goto trunc; ptr.hello_link = (struct olsr_hello_link *)msg_data; hello_len = EXTRACT_16BITS(ptr.hello_link->len); link_type = OLSR_EXTRACT_LINK_TYPE(ptr.hello_link->link_code); neighbor_type = OLSR_EXTRACT_NEIGHBOR_TYPE(ptr.hello_link->link_code); if ((hello_len <= msg_tlen) && (hello_len >= sizeof(struct olsr_hello_link))) hello_len_valid = 1; printf("\n\t link-type %s, neighbor-type %s, len %u%s", tok2str(olsr_link_type_values, "Unknown", link_type), tok2str(olsr_neighbor_type_values, "Unknown", neighbor_type), hello_len, (hello_len_valid == 0) ? " (invalid)" : ""); if (hello_len_valid == 0) break; msg_data += sizeof(struct olsr_hello_link); msg_tlen -= sizeof(struct olsr_hello_link); hello_len -= sizeof(struct olsr_hello_link); if (msg_type == OLSR_HELLO_MSG) { olsr_print_neighbor(msg_data, hello_len); } else { #if INET6 if (is_ipv6) olsr_print_lq_neighbor6(msg_data, hello_len); else #endif olsr_print_lq_neighbor4(msg_data, hello_len); } msg_data += hello_len; msg_tlen -= hello_len; } break; case OLSR_TC_MSG: case OLSR_TC_LQ_MSG: if (!TTEST2(*msg_data, sizeof(struct olsr_tc))) goto trunc; ptr.tc = (struct olsr_tc *)msg_data; printf("\n\t advertised neighbor seq 0x%04x", EXTRACT_16BITS(ptr.tc->ans_seq)); msg_data += sizeof(struct olsr_tc); msg_tlen -= sizeof(struct olsr_tc); if (msg_type == OLSR_TC_MSG) { olsr_print_neighbor(msg_data, msg_tlen); } else { #if INET6 if (is_ipv6) olsr_print_lq_neighbor6(msg_data, msg_tlen); else #endif olsr_print_lq_neighbor4(msg_data, msg_tlen); } break; case OLSR_MID_MSG: { size_t addr_size = sizeof(struct in_addr); #if INET6 if (is_ipv6) addr_size = sizeof(struct in6_addr); #endif while (msg_tlen >= addr_size) { if (!TTEST2(*msg_data, addr_size)) goto trunc; printf("\n\t interface address %s", #if INET6 is_ipv6 ? ip6addr_string(msg_data) : #endif ipaddr_string(msg_data)); msg_data += addr_size; msg_tlen -= addr_size; } break; } case OLSR_HNA_MSG: printf("\n\t Advertised networks (total %u)", (unsigned int) (msg_tlen / sizeof(struct olsr_hna6))); #if INET6 if (is_ipv6) { int i = 0; while (msg_tlen >= sizeof(struct olsr_hna6)) { struct olsr_hna6 *hna6; if (!TTEST2(*msg_data, sizeof(struct olsr_hna6))) goto trunc; hna6 = (struct olsr_hna6 *)msg_data; printf("\n\t #%i: %s/%u", i, ip6addr_string(hna6->network), mask62plen (hna6->mask)); msg_data += sizeof(struct olsr_hna6); msg_tlen -= sizeof(struct olsr_hna6); } } else #endif { int col = 0; while (msg_tlen >= sizeof(struct olsr_hna4)) { if (!TTEST2(*msg_data, sizeof(struct olsr_hna4))) goto trunc; ptr.hna = (struct olsr_hna4 *)msg_data; /* print 4 prefixes per line */ if (col == 0) printf ("\n\t "); else printf (", "); printf("%s/%u", ipaddr_string(ptr.hna->network), mask2plen(EXTRACT_32BITS(ptr.hna->mask))); msg_data += sizeof(struct olsr_hna4); msg_tlen -= sizeof(struct olsr_hna4); col = (col + 1) % 4; } } break; case OLSR_NAMESERVICE_MSG: { u_int name_entries = EXTRACT_16BITS(msg_data+2); u_int addr_size = 4; int name_entries_valid = 0; u_int i; if (is_ipv6) addr_size = 16; if ((name_entries > 0) && ((name_entries * (4 + addr_size)) <= msg_tlen)) name_entries_valid = 1; if (msg_tlen < 4) goto trunc; if (!TTEST2(*msg_data, 4)) goto trunc; printf("\n\t Version %u, Entries %u%s", EXTRACT_16BITS(msg_data), name_entries, (name_entries_valid == 0) ? " (invalid)" : ""); if (name_entries_valid == 0) break; msg_data += 4; msg_tlen -= 4; for (i = 0; i < name_entries; i++) { int name_entry_len_valid = 0; if (msg_tlen < 4) break; if (!TTEST2(*msg_data, 4)) goto trunc; name_entry_type = EXTRACT_16BITS(msg_data); name_entry_len = EXTRACT_16BITS(msg_data+2); msg_data += 4; msg_tlen -= 4; if ((name_entry_len > 0) && ((addr_size + name_entry_len) <= msg_tlen)) name_entry_len_valid = 1; printf("\n\t #%u: type %#06x, length %u%s", (unsigned int) i, name_entry_type, name_entry_len, (name_entry_len_valid == 0) ? " (invalid)" : ""); if (name_entry_len_valid == 0) break; /* 32-bit alignment */ name_entry_padding = 0; if (name_entry_len%4 != 0) name_entry_padding = 4-(name_entry_len%4); if (msg_tlen < addr_size + name_entry_len + name_entry_padding) goto trunc; if (!TTEST2(*msg_data, addr_size + name_entry_len + name_entry_padding)) goto trunc; #if INET6 if (is_ipv6) printf(", address %s, name \"", ip6addr_string(msg_data)); else #endif printf(", address %s, name \"", ipaddr_string(msg_data)); fn_printn(msg_data + addr_size, name_entry_len, NULL); printf("\""); msg_data += addr_size + name_entry_len + name_entry_padding; msg_tlen -= addr_size + name_entry_len + name_entry_padding; } /* for (i = 0; i < name_entries; i++) */ break; } /* case OLSR_NAMESERVICE_MSG */ /* * FIXME those are the defined messages that lack a decoder * you are welcome to contribute code ;-) */ case OLSR_POWERINFO_MSG: default: print_unknown_data(msg_data, "\n\t ", msg_tlen); break; } /* switch (msg_type) */ tptr += msg_len; } /* while (tptr < (pptr+length)) */ return; trunc: printf("[|olsr]"); } /* * Local Variables: * c-style: whitesmith * c-basic-offset: 4 * End: */