| /* |
| * Copyright (c) 2007-2011 Grégoire Henry, Juliusz Chroboczek |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the project nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| /* \summary: Babel Routing Protocol printer */ |
| /* Specifications: |
| * |
| * RFC 6126 |
| * RFC 7298 |
| * RFC 7557 |
| * draft-ietf-babel-rfc6126bis-17 |
| * draft-ietf-babel-hmac-10 |
| * draft-ietf-babel-source-specific-0 |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include "netdissect-stdinc.h" |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "netdissect.h" |
| #include "addrtoname.h" |
| #include "extract.h" |
| |
| static void babel_print_v2(netdissect_options *, const u_char *cp, u_int length); |
| |
| void |
| babel_print(netdissect_options *ndo, |
| const u_char *cp, u_int length) |
| { |
| ndo->ndo_protocol = "babel"; |
| ND_PRINT("babel"); |
| |
| ND_TCHECK_4(cp); |
| |
| if(GET_U_1(cp) != 42) { |
| ND_PRINT(" invalid header"); |
| return; |
| } else { |
| ND_PRINT(" %u", GET_U_1(cp + 1)); |
| } |
| |
| switch(GET_U_1(cp + 1)) { |
| case 2: |
| babel_print_v2(ndo, cp, length); |
| break; |
| default: |
| ND_PRINT(" unknown version"); |
| break; |
| } |
| |
| return; |
| |
| trunc: |
| nd_print_trunc(ndo); |
| } |
| |
| /* TLVs */ |
| #define MESSAGE_PAD1 0 |
| #define MESSAGE_PADN 1 |
| #define MESSAGE_ACK_REQ 2 |
| #define MESSAGE_ACK 3 |
| #define MESSAGE_HELLO 4 |
| #define MESSAGE_IHU 5 |
| #define MESSAGE_ROUTER_ID 6 |
| #define MESSAGE_NH 7 |
| #define MESSAGE_UPDATE 8 |
| #define MESSAGE_ROUTE_REQUEST 9 |
| #define MESSAGE_SEQNO_REQUEST 10 |
| #define MESSAGE_TSPC 11 |
| #define MESSAGE_HMAC 12 |
| #define MESSAGE_UPDATE_SRC_SPECIFIC 13 /* last appearance in draft-boutier-babel-source-specific-01 */ |
| #define MESSAGE_REQUEST_SRC_SPECIFIC 14 /* idem */ |
| #define MESSAGE_MH_REQUEST_SRC_SPECIFIC 15 /* idem */ |
| #define MESSAGE_MAC 16 |
| #define MESSAGE_PC 17 |
| #define MESSAGE_CHALLENGE_REQUEST 18 |
| #define MESSAGE_CHALLENGE_REPLY 19 |
| |
| /* sub-TLVs */ |
| #define MESSAGE_SUB_PAD1 0 |
| #define MESSAGE_SUB_PADN 1 |
| #define MESSAGE_SUB_DIVERSITY 2 |
| #define MESSAGE_SUB_TIMESTAMP 3 |
| |
| /* "Mandatory" bit in sub-TLV types */ |
| #define MANDATORY_MASK 0x80 |
| |
| /* Flags for the Hello TLV */ |
| #define UNICAST_MASK 0x8000 |
| |
| /* Diversity sub-TLV channel codes */ |
| static const struct tok diversity_str[] = { |
| { 0, "reserved" }, |
| { 255, "all" }, |
| { 0, NULL } |
| }; |
| |
| static const char * |
| format_id(netdissect_options *ndo, const u_char *id) |
| { |
| static char buf[25]; |
| snprintf(buf, 25, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x", |
| GET_U_1(id), GET_U_1(id + 1), GET_U_1(id + 2), |
| GET_U_1(id + 3), GET_U_1(id + 4), GET_U_1(id + 5), |
| GET_U_1(id + 6), GET_U_1(id + 7)); |
| buf[24] = '\0'; |
| return buf; |
| } |
| |
| static const unsigned char v4prefix[16] = |
| {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 }; |
| |
| static const char * |
| format_prefix(netdissect_options *ndo, const u_char *prefix, unsigned char plen) |
| { |
| static char buf[50]; |
| |
| /* |
| * prefix points to a buffer on the stack into which the prefix has |
| * been placed, so we can't use GET_IPADDR_STRING() or |
| * GET_IP6ADDR_STRING() on it. |
| */ |
| if(plen >= 96 && memcmp(prefix, v4prefix, 12) == 0) |
| snprintf(buf, 50, "%s/%u", ipaddr_string(ndo, prefix + 12), plen - 96); |
| else |
| snprintf(buf, 50, "%s/%u", ip6addr_string(ndo, prefix), plen); |
| buf[49] = '\0'; |
| return buf; |
| } |
| |
| static const char * |
| format_address(netdissect_options *ndo, const u_char *prefix) |
| { |
| /* |
| * prefix points to a buffer on the stack into which the prefix has |
| * been placed, so we can't use GET_IPADDR_STRING() or |
| * GET_IP6ADDR_STRING() on it. |
| */ |
| if(memcmp(prefix, v4prefix, 12) == 0) |
| return ipaddr_string(ndo, prefix + 12); |
| else |
| return ip6addr_string(ndo, prefix); |
| } |
| |
| static const char * |
| format_interval(const uint16_t i) |
| { |
| static char buf[sizeof("000.00s")]; |
| |
| if (i == 0) |
| return "0.0s (bogus)"; |
| snprintf(buf, sizeof(buf), "%u.%02us", i / 100, i % 100); |
| return buf; |
| } |
| |
| static const char * |
| format_interval_update(const uint16_t i) |
| { |
| return i == 0xFFFF ? "infinity" : format_interval(i); |
| } |
| |
| static const char * |
| format_timestamp(const uint32_t i) |
| { |
| static char buf[sizeof("0000.000000s")]; |
| snprintf(buf, sizeof(buf), "%u.%06us", i / 1000000, i % 1000000); |
| return buf; |
| } |
| |
| /* Return number of octets consumed from the input buffer (not the prefix length |
| * in bytes), or -1 for encoding error. */ |
| static int |
| network_prefix(int ae, int plen, unsigned int omitted, |
| const unsigned char *p, const unsigned char *dp, |
| unsigned int len, unsigned char *p_r) |
| { |
| unsigned pb; |
| unsigned char prefix[16]; |
| int consumed = 0; |
| |
| if(plen >= 0) |
| pb = (plen + 7) / 8; |
| else if(ae == 1) |
| pb = 4; |
| else |
| pb = 16; |
| |
| if(pb > 16) |
| return -1; |
| |
| memset(prefix, 0, 16); |
| |
| switch(ae) { |
| case 0: break; |
| case 1: |
| if(omitted > 4 || pb > 4 || (pb > omitted && len < pb - omitted)) |
| return -1; |
| memcpy(prefix, v4prefix, 12); |
| if(omitted) { |
| if (dp == NULL) return -1; |
| memcpy(prefix, dp, 12 + omitted); |
| } |
| if(pb > omitted) { |
| memcpy(prefix + 12 + omitted, p, pb - omitted); |
| consumed = pb - omitted; |
| } |
| break; |
| case 2: |
| if(omitted > 16 || (pb > omitted && len < pb - omitted)) |
| return -1; |
| if(omitted) { |
| if (dp == NULL) return -1; |
| memcpy(prefix, dp, omitted); |
| } |
| if(pb > omitted) { |
| memcpy(prefix + omitted, p, pb - omitted); |
| consumed = pb - omitted; |
| } |
| break; |
| case 3: |
| if(pb > 8 && len < pb - 8) return -1; |
| prefix[0] = 0xfe; |
| prefix[1] = 0x80; |
| if(pb > 8) { |
| memcpy(prefix + 8, p, pb - 8); |
| consumed = pb - 8; |
| } |
| break; |
| default: |
| return -1; |
| } |
| |
| memcpy(p_r, prefix, 16); |
| return consumed; |
| } |
| |
| static int |
| network_address(int ae, const unsigned char *a, unsigned int len, |
| unsigned char *a_r) |
| { |
| return network_prefix(ae, -1, 0, a, NULL, len, a_r); |
| } |
| |
| /* |
| * Sub-TLVs consume the "extra data" of Babel TLVs (see Section 4.3 of RFC6126), |
| * their encoding is similar to the encoding of TLVs, but the type namespace is |
| * different: |
| * |
| * o Type 0 stands for Pad1 sub-TLV with the same encoding as the Pad1 TLV. |
| * o Type 1 stands for PadN sub-TLV with the same encoding as the PadN TLV. |
| * o Type 2 stands for Diversity sub-TLV, which propagates diversity routing |
| * data. Its body is a variable-length sequence of 8-bit unsigned integers, |
| * each representing per-hop number of interfering radio channel for the |
| * prefix. Channel 0 is invalid and must not be used in the sub-TLV, channel |
| * 255 interferes with any other channel. |
| * o Type 3 stands for Timestamp sub-TLV, used to compute RTT between |
| * neighbours. In the case of a Hello TLV, the body stores a 32-bits |
| * timestamp, while in the case of a IHU TLV, two 32-bits timestamps are |
| * stored. |
| * |
| * Sub-TLV types 0 and 1 are valid for any TLV type, whether sub-TLV type 2 is |
| * only valid for TLV type 8 (Update). Note that within an Update TLV a missing |
| * Diversity sub-TLV is not the same as a Diversity sub-TLV with an empty body. |
| * The former would mean a lack of any claims about the interference, and the |
| * latter would state that interference is definitely absent. |
| * A type 3 sub-TLV is valid both for Hello and IHU TLVs, though the exact |
| * semantic of the sub-TLV is different in each case. |
| */ |
| static void |
| subtlvs_print(netdissect_options *ndo, |
| const u_char *cp, const u_char *ep, const uint8_t tlv_type) |
| { |
| uint8_t subtype, sublen; |
| const char *sep; |
| uint32_t t1, t2; |
| |
| while (cp < ep) { |
| subtype = GET_U_1(cp); |
| cp++; |
| if(subtype == MESSAGE_SUB_PAD1) { |
| ND_PRINT(" sub-pad1"); |
| continue; |
| } |
| if ((MANDATORY_MASK & subtype) != 0) |
| ND_PRINT(" (M)"); |
| if(cp == ep) |
| goto invalid; |
| sublen = GET_U_1(cp); |
| cp++; |
| if(cp + sublen > ep) |
| goto invalid; |
| |
| switch(subtype) { |
| case MESSAGE_SUB_PADN: |
| ND_PRINT(" sub-padn"); |
| cp += sublen; |
| break; |
| case MESSAGE_SUB_DIVERSITY: |
| ND_PRINT(" sub-diversity"); |
| if (sublen == 0) { |
| ND_PRINT(" empty"); |
| break; |
| } |
| sep = " "; |
| while (sublen) { |
| ND_PRINT("%s%s", sep, |
| tok2str(diversity_str, "%u", GET_U_1(cp))); |
| cp++; |
| sep = "-"; |
| sublen--; |
| } |
| if(tlv_type != MESSAGE_UPDATE && |
| tlv_type != MESSAGE_UPDATE_SRC_SPECIFIC) |
| ND_PRINT(" (bogus)"); |
| break; |
| case MESSAGE_SUB_TIMESTAMP: |
| ND_PRINT(" sub-timestamp"); |
| if(tlv_type == MESSAGE_HELLO) { |
| if(sublen < 4) |
| goto invalid; |
| t1 = GET_BE_U_4(cp); |
| ND_PRINT(" %s", format_timestamp(t1)); |
| } else if(tlv_type == MESSAGE_IHU) { |
| if(sublen < 8) |
| goto invalid; |
| t1 = GET_BE_U_4(cp); |
| ND_PRINT(" %s", format_timestamp(t1)); |
| t2 = GET_BE_U_4(cp + 4); |
| ND_PRINT("|%s", format_timestamp(t2)); |
| } else |
| ND_PRINT(" (bogus)"); |
| cp += sublen; |
| break; |
| default: |
| ND_PRINT(" sub-unknown-0x%02x", subtype); |
| cp += sublen; |
| } /* switch */ |
| } /* while */ |
| return; |
| |
| invalid: |
| nd_print_invalid(ndo); |
| } |
| |
| #define ICHECK(i, l) \ |
| if ((i) + (l) > tlvs_length || (i) + (l) > packet_length_remaining) \ |
| goto invalid; |
| |
| static int |
| babel_print_v2_tlvs(netdissect_options *ndo, |
| const u_char *cp, u_int tlvs_length, |
| u_int packet_length_remaining) |
| { |
| u_int i; |
| u_char v4_prefix[16] = |
| {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 }; |
| u_char v6_prefix[16] = {0}; |
| |
| i = 0; |
| while(i < tlvs_length) { |
| const u_char *message; |
| uint8_t type; |
| u_int len; |
| |
| message = cp + i; |
| |
| ICHECK(i, 1); |
| if((type = GET_U_1(message)) == MESSAGE_PAD1) { |
| ND_PRINT(ndo->ndo_vflag ? "\n\tPad 1" : " pad1"); |
| i += 1; |
| continue; |
| } |
| |
| ICHECK(i, 2); |
| ND_TCHECK_2(message); |
| len = GET_U_1(message + 1); |
| |
| ICHECK(i, 2 + len); |
| ND_TCHECK_LEN(message, 2 + len); |
| |
| switch(type) { |
| case MESSAGE_PADN: { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" padN"); |
| else |
| ND_PRINT("\n\tPad %u", len + 2); |
| } |
| break; |
| |
| case MESSAGE_ACK_REQ: { |
| u_short nonce, interval; |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" ack-req"); |
| else { |
| ND_PRINT("\n\tAcknowledgment Request "); |
| if(len < 6) goto invalid; |
| nonce = GET_BE_U_2(message + 4); |
| interval = GET_BE_U_2(message + 6); |
| ND_PRINT("%04x %s", nonce, format_interval(interval)); |
| } |
| } |
| break; |
| |
| case MESSAGE_ACK: { |
| u_short nonce; |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" ack"); |
| else { |
| ND_PRINT("\n\tAcknowledgment "); |
| if(len < 2) goto invalid; |
| nonce = GET_BE_U_2(message + 2); |
| ND_PRINT("%04x", nonce); |
| } |
| } |
| break; |
| |
| case MESSAGE_HELLO: { |
| u_short seqno, interval, unicast; |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" hello"); |
| else { |
| ND_PRINT("\n\tHello "); |
| if(len < 6) goto invalid; |
| unicast = (GET_BE_U_2(message + 2) & UNICAST_MASK); |
| seqno = GET_BE_U_2(message + 4); |
| interval = GET_BE_U_2(message + 6); |
| if(unicast) |
| ND_PRINT("(Unicast) "); |
| ND_PRINT("seqno %u ", seqno); |
| if(interval!=0) |
| ND_PRINT("interval %s", format_interval(interval)); |
| else |
| ND_PRINT("unscheduled"); |
| /* Extra data. */ |
| if(len > 6) |
| subtlvs_print(ndo, message + 8, message + 2 + len, type); |
| } |
| } |
| break; |
| |
| case MESSAGE_IHU: { |
| unsigned short rxcost, interval; |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" ihu"); |
| else { |
| u_char address[16]; |
| u_char ae; |
| int rc; |
| ND_PRINT("\n\tIHU "); |
| if(len < 6) goto invalid; |
| rxcost = GET_BE_U_2(message + 4); |
| interval = GET_BE_U_2(message + 6); |
| ae = GET_U_1(message + 2); |
| rc = network_address(ae, message + 8, |
| len - 6, address); |
| if(rc < 0) { nd_print_trunc(ndo); break; } |
| ND_PRINT("%s rxcost %u interval %s", |
| ae == 0 ? "any" : format_address(ndo, address), |
| rxcost, format_interval(interval)); |
| /* Extra data. */ |
| if((u_int)rc < len - 6) |
| subtlvs_print(ndo, message + 8 + rc, message + 2 + len, |
| type); |
| } |
| } |
| break; |
| |
| case MESSAGE_ROUTER_ID: { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" router-id"); |
| else { |
| ND_PRINT("\n\tRouter Id"); |
| if(len < 10) goto invalid; |
| ND_PRINT(" %s", format_id(ndo, message + 4)); |
| } |
| } |
| break; |
| |
| case MESSAGE_NH: { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" nh"); |
| else { |
| int rc; |
| u_char ae; |
| u_char nh[16]; |
| ND_PRINT("\n\tNext Hop"); |
| if(len < 2) goto invalid; |
| ae = GET_U_1(message + 2); |
| rc = network_address(ae, message + 4, |
| len - 2, nh); |
| if(rc < 0) goto invalid; |
| ND_PRINT(" %s", ae == 0 ? "invalid AE 0" : format_address(ndo, nh)); |
| } |
| } |
| break; |
| |
| case MESSAGE_UPDATE: { |
| if (!ndo->ndo_vflag) { |
| ND_PRINT(" update"); |
| if(len < 10) |
| goto invalid; |
| else |
| ND_PRINT("%s%s%s", |
| (GET_U_1(message + 3) & 0x80) ? "/prefix": "", |
| (GET_U_1(message + 3) & 0x40) ? "/id" : "", |
| (GET_U_1(message + 3) & 0x3f) ? "/unknown" : ""); |
| } else { |
| u_short interval, seqno, metric; |
| u_char ae, plen; |
| int rc; |
| u_char prefix[16]; |
| ND_PRINT("\n\tUpdate"); |
| if(len < 10) goto invalid; |
| ae = GET_U_1(message + 2); |
| plen = GET_U_1(message + 4) + (GET_U_1(message + 2) == 1 ? 96 : 0); |
| rc = network_prefix(ae, |
| GET_U_1(message + 4), |
| GET_U_1(message + 5), |
| message + 12, |
| GET_U_1(message + 2) == 1 ? v4_prefix : v6_prefix, |
| len - 10, prefix); |
| if(rc < 0) goto invalid; |
| interval = GET_BE_U_2(message + 6); |
| seqno = GET_BE_U_2(message + 8); |
| metric = GET_BE_U_2(message + 10); |
| ND_PRINT("%s%s%s %s metric %u seqno %u interval %s", |
| (GET_U_1(message + 3) & 0x80) ? "/prefix": "", |
| (GET_U_1(message + 3) & 0x40) ? "/id" : "", |
| (GET_U_1(message + 3) & 0x3f) ? "/unknown" : "", |
| ae == 0 ? "any" : format_prefix(ndo, prefix, plen), |
| metric, seqno, format_interval_update(interval)); |
| if(GET_U_1(message + 3) & 0x80) { |
| if(GET_U_1(message + 2) == 1) |
| memcpy(v4_prefix, prefix, 16); |
| else |
| memcpy(v6_prefix, prefix, 16); |
| } |
| /* extra data? */ |
| if((u_int)rc < len - 10) |
| subtlvs_print(ndo, message + 12 + rc, message + 2 + len, type); |
| } |
| } |
| break; |
| |
| case MESSAGE_ROUTE_REQUEST: { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" route-request"); |
| else { |
| int rc; |
| u_char prefix[16], ae, plen; |
| ND_PRINT("\n\tRoute Request "); |
| if(len < 2) goto invalid; |
| ae = GET_U_1(message + 2); |
| plen = GET_U_1(message + 3) + (GET_U_1(message + 2) == 1 ? 96 : 0); |
| rc = network_prefix(ae, |
| GET_U_1(message + 3), 0, |
| message + 4, NULL, len - 2, prefix); |
| if(rc < 0) goto invalid; |
| ND_PRINT("for %s", |
| ae == 0 ? "any" : format_prefix(ndo, prefix, plen)); |
| } |
| } |
| break; |
| |
| case MESSAGE_SEQNO_REQUEST : { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" seqno-request"); |
| else { |
| int rc; |
| u_short seqno; |
| u_char prefix[16], ae, plen; |
| ND_PRINT("\n\tSeqno Request "); |
| if(len < 14) goto invalid; |
| ae = GET_U_1(message + 2); |
| seqno = GET_BE_U_2(message + 4); |
| rc = network_prefix(ae, |
| GET_U_1(message + 3), 0, |
| message + 16, NULL, len - 14, prefix); |
| if(rc < 0) goto invalid; |
| plen = GET_U_1(message + 3) + (GET_U_1(message + 2) == 1 ? 96 : 0); |
| ND_PRINT("(%u hops) for %s seqno %u id %s", |
| GET_U_1(message + 6), |
| ae == 0 ? "invalid AE 0" : format_prefix(ndo, prefix, plen), |
| seqno, format_id(ndo, message + 8)); |
| } |
| } |
| break; |
| case MESSAGE_TSPC : |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" tspc"); |
| else { |
| ND_PRINT("\n\tTS/PC "); |
| if(len < 6) goto invalid; |
| ND_PRINT("timestamp %u packetcounter %u", |
| GET_BE_U_4(message + 4), |
| GET_BE_U_2(message + 2)); |
| } |
| break; |
| case MESSAGE_HMAC : { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" hmac"); |
| else { |
| unsigned j; |
| ND_PRINT("\n\tHMAC "); |
| if(len < 18) goto invalid; |
| ND_PRINT("key-id %u digest-%u ", GET_BE_U_2(message + 2), |
| len - 2); |
| for (j = 0; j < len - 2; j++) |
| ND_PRINT("%02X", GET_U_1(message + j + 4)); |
| } |
| } |
| break; |
| |
| case MESSAGE_UPDATE_SRC_SPECIFIC : { |
| if(!ndo->ndo_vflag) { |
| ND_PRINT(" ss-update"); |
| } else { |
| u_char prefix[16], src_prefix[16]; |
| u_short interval, seqno, metric; |
| u_char ae, plen, src_plen, omitted; |
| int rc; |
| int parsed_len = 10; |
| ND_PRINT("\n\tSS-Update"); |
| if(len < 10) goto invalid; |
| ae = GET_U_1(message + 2); |
| src_plen = GET_U_1(message + 3); |
| plen = GET_U_1(message + 4); |
| omitted = GET_U_1(message + 5); |
| interval = GET_BE_U_2(message + 6); |
| seqno = GET_BE_U_2(message + 8); |
| metric = GET_BE_U_2(message + 10); |
| rc = network_prefix(ae, plen, omitted, message + 2 + parsed_len, |
| ae == 1 ? v4_prefix : v6_prefix, |
| len - parsed_len, prefix); |
| if(rc < 0) goto invalid; |
| if(ae == 1) |
| plen += 96; |
| parsed_len += rc; |
| rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len, |
| NULL, len - parsed_len, src_prefix); |
| if(rc < 0) goto invalid; |
| if(ae == 1) |
| src_plen += 96; |
| parsed_len += rc; |
| |
| ND_PRINT(" %s from", format_prefix(ndo, prefix, plen)); |
| ND_PRINT(" %s metric %u seqno %u interval %s", |
| format_prefix(ndo, src_prefix, src_plen), |
| metric, seqno, format_interval_update(interval)); |
| /* extra data? */ |
| if((u_int)parsed_len < len) |
| subtlvs_print(ndo, message + 2 + parsed_len, |
| message + 2 + len, type); |
| } |
| } |
| break; |
| |
| case MESSAGE_REQUEST_SRC_SPECIFIC : { |
| if(!ndo->ndo_vflag) |
| ND_PRINT(" ss-request"); |
| else { |
| int rc, parsed_len = 3; |
| u_char ae, plen, src_plen, prefix[16], src_prefix[16]; |
| ND_PRINT("\n\tSS-Request "); |
| if(len < 3) goto invalid; |
| ae = GET_U_1(message + 2); |
| plen = GET_U_1(message + 3); |
| src_plen = GET_U_1(message + 4); |
| rc = network_prefix(ae, plen, 0, message + 2 + parsed_len, |
| NULL, len - parsed_len, prefix); |
| if(rc < 0) goto invalid; |
| if(ae == 1) |
| plen += 96; |
| parsed_len += rc; |
| rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len, |
| NULL, len - parsed_len, src_prefix); |
| if(rc < 0) goto invalid; |
| if(ae == 1) |
| src_plen += 96; |
| parsed_len += rc; |
| if(ae == 0) { |
| ND_PRINT("for any"); |
| } else { |
| ND_PRINT("for (%s, ", format_prefix(ndo, prefix, plen)); |
| ND_PRINT("%s)", format_prefix(ndo, src_prefix, src_plen)); |
| } |
| } |
| } |
| break; |
| |
| case MESSAGE_MH_REQUEST_SRC_SPECIFIC : { |
| if(!ndo->ndo_vflag) |
| ND_PRINT(" ss-mh-request"); |
| else { |
| int rc, parsed_len = 14; |
| u_short seqno; |
| u_char ae, plen, src_plen, prefix[16], src_prefix[16], hopc; |
| const u_char *router_id = NULL; |
| ND_PRINT("\n\tSS-MH-Request "); |
| if(len < 14) goto invalid; |
| ae = GET_U_1(message + 2); |
| plen = GET_U_1(message + 3); |
| seqno = GET_BE_U_2(message + 4); |
| hopc = GET_U_1(message + 6); |
| src_plen = GET_U_1(message + 7); |
| router_id = message + 8; |
| rc = network_prefix(ae, plen, 0, message + 2 + parsed_len, |
| NULL, len - parsed_len, prefix); |
| if(rc < 0) goto invalid; |
| if(ae == 1) |
| plen += 96; |
| parsed_len += rc; |
| rc = network_prefix(ae, src_plen, 0, message + 2 + parsed_len, |
| NULL, len - parsed_len, src_prefix); |
| if(rc < 0) goto invalid; |
| if(ae == 1) |
| src_plen += 96; |
| ND_PRINT("(%u hops) for (%s, ", |
| hopc, format_prefix(ndo, prefix, plen)); |
| ND_PRINT("%s) seqno %u id %s", |
| format_prefix(ndo, src_prefix, src_plen), |
| seqno, format_id(ndo, router_id)); |
| } |
| } |
| break; |
| |
| case MESSAGE_MAC: { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" mac"); |
| else { |
| ND_PRINT("\n\tMAC "); |
| ND_PRINT("len %u", len); |
| } |
| } |
| break; |
| |
| case MESSAGE_PC: { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" pc"); |
| else { |
| ND_PRINT("\n\tPC"); |
| if(len < 4) goto invalid; |
| ND_PRINT(" value %u", |
| GET_BE_U_4(message + 2)); |
| ND_PRINT(" index len %u", len-4); |
| } |
| } |
| break; |
| |
| case MESSAGE_CHALLENGE_REQUEST: { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" challenge_request"); |
| else { |
| ND_PRINT("\n\tChallenge Request"); |
| if(len > 192) goto invalid; |
| ND_PRINT(" len %u", len); |
| } |
| } |
| break; |
| |
| case MESSAGE_CHALLENGE_REPLY: { |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" challenge_reply"); |
| else { |
| ND_PRINT("\n\tChallenge Reply"); |
| if (len > 192) goto invalid; |
| ND_PRINT(" len %u", len); |
| } |
| } |
| break; |
| |
| default: |
| if (!ndo->ndo_vflag) |
| ND_PRINT(" unknown"); |
| else |
| ND_PRINT("\n\tUnknown message type %u", type); |
| } |
| i += len + 2; |
| } |
| |
| return 0; /* OK */ |
| |
| trunc: |
| return -1; /* packet truncated by capture process */ |
| |
| invalid: |
| return -2; /* packet is invalid */ |
| } |
| |
| static void |
| babel_print_v2(netdissect_options *ndo, |
| const u_char *cp, u_int length) |
| { |
| u_short bodylen; |
| int ret; |
| |
| ND_TCHECK_4(cp); |
| if (length < 4) |
| goto invalid; |
| bodylen = GET_BE_U_2(cp + 2); |
| ND_PRINT(" (%u)", bodylen); |
| length -= 4; |
| cp += 4; |
| |
| /* Process the TLVs in the body */ |
| if (length < bodylen) |
| goto invalid; |
| ret = babel_print_v2_tlvs(ndo, cp, bodylen, length); |
| if (ret == -1) |
| goto trunc; |
| if (ret == -2) |
| goto invalid; |
| length -= bodylen; |
| cp += bodylen; |
| |
| /* If there's a trailer, process the TLVs in the trailer */ |
| if (length != 0) { |
| if(ndo->ndo_vflag) ND_PRINT("\n\t----"); |
| else ND_PRINT(" |"); |
| ret = babel_print_v2_tlvs(ndo, cp, length, length); |
| if (ret == -1) |
| goto trunc; |
| if (ret == -2) |
| goto invalid; |
| } |
| return; |
| |
| trunc: |
| nd_print_trunc(ndo); |
| return; |
| |
| invalid: |
| nd_print_invalid(ndo); |
| } |
