450 lines
15 KiB
C
450 lines
15 KiB
C
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/*
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* Copyright (c) 2015 Ritesh Ranjan (r.ranjan789@gmail.com)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* \summary: - Locator/Identifier Separation Protocol (LISP) printer */
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/*
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* specification: RFC 6830
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*
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*
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* The Map-Register message format is:
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Type=3 |P|S|I|R| Reserved |M| Record Count |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Nonce . . . |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | . . . Nonce |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Key ID | Authentication Data Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* ~ Authentication Data ~
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* +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | | Record TTL |
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* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* R | Locator Count | EID mask-len | ACT |A| Reserved |
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* e +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* c | Rsvd | Map-Version Number | EID-Prefix-AFI |
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* o +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* r | EID-Prefix |
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* d +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | /| Priority | Weight | M Priority | M Weight |
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* | L +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | o | Unused Flags |L|p|R| Loc-AFI |
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* | c +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | \| Locator |
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* +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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*
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* The Map-Notify message format is:
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |Type=4 |I|R| Reserved | Record Count |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Nonce . . . |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | . . . Nonce |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Key ID | Authentication Data Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* ~ Authentication Data ~
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* +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | | Record TTL |
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* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* R | Locator Count | EID mask-len | ACT |A| Reserved |
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* e +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* c | Rsvd | Map-Version Number | EID-Prefix-AFI |
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* o +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* r | EID-Prefix |
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* d +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | /| Priority | Weight | M Priority | M Weight |
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* | L +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | o | Unused Flags |L|p|R| Loc-AFI |
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* | c +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | \| Locator |
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* +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include <netdissect.h>
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#include <string.h>
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#include <stdlib.h>
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#include "ip.h"
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#include "ip6.h"
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#include "extract.h"
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#include "addrtoname.h"
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static const char tstr[] = " [|LISP]";
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#define IPv4_AFI 1
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#define IPv6_AFI 2
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#define TYPE_INDEX 4
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#define LISP_MAP_NOTIFY_IBIT_MASK 8
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#define LISP_MAP_REGISTER_IBIT_MASK 2
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enum {
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LISP_MAP_REQUEST = 1,
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LISP_MAP_REPLY,
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LISP_MAP_REGISTER,
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LISP_MAP_NOTIFY,
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LISP_ENCAPSULATED_CONTROL_MESSAGE = 8
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};
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enum {
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LISP_AUTH_NONE,
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LISP_AUTH_SHA1,
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LISP_AUTH_SHA256
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};
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static const struct tok lisp_type [] = {
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{ 0, "LISP-Reserved" },
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{ 1, "LISP-Map-Request" },
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{ 2, "LISP-Map-Reply" },
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{ 3, "LISP-Map-Register" },
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{ 4, "LISP-Map-Notify" },
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{ 8, "LISP-Encapsulated-Contol-Message" },
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{ 0, NULL }
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};
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/*
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* P-Bit : Request for Proxy Map-Reply from the MS/MR
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* S-Bit : Security Enhancement. ETR is LISP-SEC enabled. draft-ietf-lisp-sec
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* I-Bit : 128 bit xTR-ID and 64 bit Site-ID present.
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* xTR-ID and Site-ID help in differentiation of xTRs in multi xTR
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* and multi Site deployment scenarios.
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* R-Bit : Built for a Reencapsulating-Tunnel-Router. Used in Traffic
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* Engineering and Service Chaining
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*/
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static const struct tok map_register_hdr_flag[] = {
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{ 0x08000000, "P-Proxy-Map-Reply" },
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{ 0x04000000, "S-LISP-SEC-Capable" },
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{ 0x02000000, "I-xTR-ID-Present" },
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{ 0x01000000, "R-Build-For-RTR" },
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{ 0x00000100, "M-Want-Map-Notify" },
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{ 0, NULL }
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};
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static const struct tok map_notify_hdr_flag[] = {
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{ 0x08000000, "I-xTR-ID-Present" },
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{ 0x04000000, "R-Build-For-RTR" },
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{ 0, NULL }
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};
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static const struct tok auth_type[] = {
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{ LISP_AUTH_NONE, "None" },
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{ LISP_AUTH_SHA1, "SHA1" },
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{ LISP_AUTH_SHA256, "SHA256" },
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{ 0, NULL}
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};
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static const struct tok lisp_eid_action[] = {
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{ 0, "No-Action" },
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{ 1, "Natively-Forward" },
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{ 2, "Send-Map-Request" },
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{ 3, "Drop" },
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{ 0, NULL}
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};
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static const struct tok lisp_loc_flag[] = {
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{ 0x0004, "Local-Locator" },
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{ 0x0002, "RLoc-Probed" },
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{ 0x0001, "Reachable" },
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{ 0, NULL }
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};
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typedef struct map_register_hdr {
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nd_uint8_t type_and_flag;
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nd_uint8_t reserved;
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nd_uint8_t reserved_and_flag2;
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nd_uint8_t record_count;
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nd_uint64_t nonce;
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nd_uint16_t key_id;
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nd_uint16_t auth_data_len;
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} lisp_map_register_hdr;
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#define MAP_REGISTER_HDR_LEN sizeof(lisp_map_register_hdr)
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typedef struct map_register_eid {
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nd_uint32_t ttl;
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nd_uint8_t locator_count;
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nd_uint8_t eid_prefix_mask_length;
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nd_uint8_t act_auth_inc_res;
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nd_uint8_t reserved;
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nd_uint8_t reserved_version_hi;
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nd_uint8_t version_low;
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nd_uint16_t eid_prefix_afi;
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} lisp_map_register_eid;
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#define MAP_REGISTER_EID_LEN sizeof(lisp_map_register_eid)
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typedef struct map_register_loc {
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nd_uint8_t priority;
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nd_uint8_t weight;
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nd_uint8_t m_priority;
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nd_uint8_t m_weight;
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nd_uint16_t unused_and_flag;
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nd_uint16_t locator_afi;
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} lisp_map_register_loc;
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#define MAP_REGISTER_LOC_LEN sizeof(lisp_map_register_loc)
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static inline uint8_t extract_lisp_type(uint8_t);
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static inline uint8_t is_xtr_data_present(uint8_t , uint8_t);
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static void lisp_hdr_flag(netdissect_options *, const lisp_map_register_hdr *);
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static void action_flag(netdissect_options *, uint8_t);
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static void loc_hdr_flag(netdissect_options *, uint16_t);
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void lisp_print(netdissect_options *ndo, const u_char *bp, u_int length)
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{
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uint8_t type;
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uint8_t mask_len;
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uint8_t loc_count;
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uint8_t xtr_present;
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uint8_t record_count;
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uint16_t key_id;
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uint16_t eid_afi;
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uint16_t loc_afi;
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uint16_t map_version;
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uint16_t packet_offset;
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uint16_t auth_data_len;
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uint32_t ttl;
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const u_char *packet_iterator;
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const u_char *loc_ip_pointer;
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const lisp_map_register_hdr *lisp_hdr;
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const lisp_map_register_eid *lisp_eid;
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const lisp_map_register_loc *lisp_loc;
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/* Check if enough bytes for header are available */
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ND_TCHECK2(*bp, MAP_REGISTER_HDR_LEN);
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lisp_hdr = (const lisp_map_register_hdr *) bp;
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lisp_hdr_flag(ndo, lisp_hdr);
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/* Supporting only MAP NOTIFY and MAP REGISTER LISP packets */
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type = extract_lisp_type(lisp_hdr->type_and_flag);
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if ((type != LISP_MAP_REGISTER) && (type != LISP_MAP_NOTIFY))
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return;
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/* Find if the packet contains xTR and Site-ID data */
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xtr_present = is_xtr_data_present(type, lisp_hdr->type_and_flag);
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/* Extract the number of EID records present */
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auth_data_len = EXTRACT_16BITS(&lisp_hdr->auth_data_len);
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packet_iterator = (const u_char *)(lisp_hdr);
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packet_offset = MAP_REGISTER_HDR_LEN;
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record_count = lisp_hdr->record_count;
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if (ndo->ndo_vflag) {
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key_id = EXTRACT_16BITS(&lisp_hdr->key_id);
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ND_PRINT((ndo, "\n %u record(s), ", record_count));
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ND_PRINT((ndo, "Authentication %s,",
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tok2str(auth_type, "unknown-type", key_id)));
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hex_print(ndo, "\n Authentication-Data: ", packet_iterator +
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packet_offset, auth_data_len);
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} else {
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ND_PRINT((ndo, " %u record(s),", record_count));
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}
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packet_offset += auth_data_len;
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if (record_count == 0)
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goto invalid;
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/* Print all the EID records */
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while ((length > packet_offset) && (record_count--)) {
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ND_TCHECK2(*(packet_iterator + packet_offset), MAP_REGISTER_EID_LEN);
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ND_PRINT((ndo, "\n"));
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lisp_eid = (const lisp_map_register_eid *)
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((const u_char *)lisp_hdr + packet_offset);
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packet_offset += MAP_REGISTER_EID_LEN;
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mask_len = lisp_eid->eid_prefix_mask_length;
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eid_afi = EXTRACT_16BITS(&lisp_eid->eid_prefix_afi);
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loc_count = lisp_eid->locator_count;
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if (ndo->ndo_vflag) {
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ttl = EXTRACT_32BITS(&lisp_eid->ttl);
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ND_PRINT((ndo, " Record TTL %u,", ttl));
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action_flag(ndo, lisp_eid->act_auth_inc_res);
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map_version = (((lisp_eid->reserved_version_hi) & 15 ) * 255) +
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lisp_eid->version_low;
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ND_PRINT((ndo, " Map Version: %u,", map_version));
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}
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switch (eid_afi) {
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case IPv4_AFI:
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ND_TCHECK2(*(packet_iterator + packet_offset), 4);
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ND_PRINT((ndo, " EID %s/%u,", ipaddr_string(ndo,
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packet_iterator + packet_offset), mask_len));
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packet_offset += 4;
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break;
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case IPv6_AFI:
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ND_TCHECK2(*(packet_iterator + packet_offset), 16);
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ND_PRINT((ndo, " EID %s/%u,", ip6addr_string(ndo,
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packet_iterator + packet_offset), mask_len));
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packet_offset += 16;
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break;
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default:
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/*
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* No support for LCAF right now.
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*/
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return;
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break;
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}
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ND_PRINT((ndo, " %u locator(s)", loc_count));
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while (loc_count--) {
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ND_TCHECK2(*(packet_iterator + packet_offset), MAP_REGISTER_LOC_LEN);
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lisp_loc = (const lisp_map_register_loc *) (packet_iterator + packet_offset);
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|
loc_ip_pointer = (const u_char *) (lisp_loc + 1);
|
||
|
|
packet_offset += MAP_REGISTER_LOC_LEN;
|
||
|
|
loc_afi = EXTRACT_16BITS(&lisp_loc->locator_afi);
|
||
|
|
|
||
|
|
if (ndo->ndo_vflag)
|
||
|
|
ND_PRINT((ndo, "\n "));
|
||
|
|
|
||
|
|
switch (loc_afi) {
|
||
|
|
case IPv4_AFI:
|
||
|
|
ND_TCHECK2(*(packet_iterator + packet_offset), 4);
|
||
|
|
ND_PRINT((ndo, " LOC %s", ipaddr_string(ndo, loc_ip_pointer)));
|
||
|
|
packet_offset += 4;
|
||
|
|
break;
|
||
|
|
case IPv6_AFI:
|
||
|
|
ND_TCHECK2(*(packet_iterator + packet_offset), 16);
|
||
|
|
ND_PRINT((ndo, " LOC %s", ip6addr_string(ndo, loc_ip_pointer)));
|
||
|
|
packet_offset += 16;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (ndo->ndo_vflag) {
|
||
|
|
ND_PRINT((ndo, "\n Priority/Weight %u/%u,"
|
||
|
|
" Multicast Priority/Weight %u/%u,",
|
||
|
|
lisp_loc->priority, lisp_loc->weight,
|
||
|
|
lisp_loc->m_priority, lisp_loc->m_weight));
|
||
|
|
loc_hdr_flag(ndo, EXTRACT_16BITS(&lisp_loc->unused_and_flag));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Print xTR and Site ID. Handle the fact that the packet could be invalid.
|
||
|
|
* If the xTR_ID_Present bit is not set, and we still have data to display,
|
||
|
|
* show it as hex data.
|
||
|
|
*/
|
||
|
|
if (xtr_present) {
|
||
|
|
if (!ND_TTEST2(*(packet_iterator + packet_offset), 24))
|
||
|
|
goto invalid;
|
||
|
|
hex_print_with_offset(ndo, "\n xTR-ID: ", packet_iterator + packet_offset, 16, 0);
|
||
|
|
ND_PRINT((ndo, "\n SITE-ID: %" PRIu64,
|
||
|
|
EXTRACT_64BITS(packet_iterator + packet_offset + 16)));
|
||
|
|
} else {
|
||
|
|
/* Check if packet isn't over yet */
|
||
|
|
if (packet_iterator + packet_offset < ndo->ndo_snapend) {
|
||
|
|
hex_print_with_offset(ndo, "\n Data: ", packet_iterator + packet_offset,
|
||
|
|
(ndo->ndo_snapend - (packet_iterator + packet_offset)), 0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
trunc:
|
||
|
|
ND_PRINT((ndo, "\n %s", tstr));
|
||
|
|
return;
|
||
|
|
invalid:
|
||
|
|
ND_PRINT((ndo, "\n %s", istr));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline uint8_t extract_lisp_type(uint8_t lisp_hdr_flags)
|
||
|
|
{
|
||
|
|
return (lisp_hdr_flags) >> TYPE_INDEX;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline uint8_t is_xtr_data_present(uint8_t type, uint8_t lisp_hdr_flags)
|
||
|
|
{
|
||
|
|
uint8_t xtr_present = 0;
|
||
|
|
|
||
|
|
if (type == LISP_MAP_REGISTER)
|
||
|
|
xtr_present = (lisp_hdr_flags) & LISP_MAP_REGISTER_IBIT_MASK;
|
||
|
|
else if (type == LISP_MAP_NOTIFY)
|
||
|
|
xtr_present = (lisp_hdr_flags) & LISP_MAP_NOTIFY_IBIT_MASK;
|
||
|
|
|
||
|
|
return xtr_present;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void lisp_hdr_flag(netdissect_options *ndo, const lisp_map_register_hdr *lisp_hdr)
|
||
|
|
{
|
||
|
|
uint8_t type = extract_lisp_type(lisp_hdr->type_and_flag);
|
||
|
|
|
||
|
|
if (!ndo->ndo_vflag) {
|
||
|
|
ND_PRINT((ndo, "%s,", tok2str(lisp_type, "unknown-type-%u", type)));
|
||
|
|
return;
|
||
|
|
} else {
|
||
|
|
ND_PRINT((ndo, "%s,", tok2str(lisp_type, "unknown-type-%u", type)));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (type == LISP_MAP_REGISTER) {
|
||
|
|
ND_PRINT((ndo, " flags [%s],", bittok2str(map_register_hdr_flag,
|
||
|
|
"none", EXTRACT_32BITS(lisp_hdr))));
|
||
|
|
} else if (type == LISP_MAP_NOTIFY) {
|
||
|
|
ND_PRINT((ndo, " flags [%s],", bittok2str(map_notify_hdr_flag,
|
||
|
|
"none", EXTRACT_32BITS(lisp_hdr))));
|
||
|
|
}
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void action_flag(netdissect_options *ndo, uint8_t act_auth_inc_res)
|
||
|
|
{
|
||
|
|
uint8_t action;
|
||
|
|
uint8_t authoritative;
|
||
|
|
|
||
|
|
authoritative = ((act_auth_inc_res >> 4) & 1);
|
||
|
|
|
||
|
|
if (authoritative)
|
||
|
|
ND_PRINT((ndo, " Authoritative,"));
|
||
|
|
else
|
||
|
|
ND_PRINT((ndo, " Non-Authoritative,"));
|
||
|
|
|
||
|
|
action = act_auth_inc_res >> 5;
|
||
|
|
ND_PRINT((ndo, " %s,", tok2str(lisp_eid_action, "unknown", action)));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void loc_hdr_flag(netdissect_options *ndo, uint16_t flag)
|
||
|
|
{
|
||
|
|
ND_PRINT((ndo, " flags [%s],", bittok2str(lisp_loc_flag, "none", flag)));
|
||
|
|
}
|
||
|
|
|