| /* Copyright (c) 2015, bugyo |
| * All rights reserved. |
| * |
| * 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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: Generic Protocol Extension for VXLAN (VXLAN GPE) printer */ |
| |
| /* specification: draft-ietf-nvo3-vxlan-gpe-10 */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include "netdissect-stdinc.h" |
| |
| #define ND_LONGJMP_FROM_TCHECK |
| #include "netdissect.h" |
| #include "extract.h" |
| |
| static const struct tok vxlan_gpe_flags [] = { |
| { 0x08, "I" }, |
| { 0x04, "P" }, |
| { 0x02, "B" }, |
| { 0x01, "O" }, |
| { 0, NULL } |
| }; |
| |
| #define VXLAN_GPE_HDR_LEN 8 |
| |
| /* |
| * VXLAN GPE header, draft-ietf-nvo3-vxlan-gpe-01 |
| * Generic Protocol Extension for VXLAN |
| * |
| * 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 |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * |R|R|Ver|I|P|R|O| Reserved |Next Protocol | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| * | VXLAN Network Identifier (VNI) | Reserved | |
| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| |
| void |
| vxlan_gpe_print(netdissect_options *ndo, const u_char *bp, u_int len) |
| { |
| uint8_t flags; |
| uint8_t next_protocol; |
| uint32_t vni; |
| |
| ndo->ndo_protocol = "vxlan_gpe"; |
| ND_PRINT("VXLAN-GPE, "); |
| if (len < VXLAN_GPE_HDR_LEN) { |
| ND_PRINT(" (len %u < %u)", len, VXLAN_GPE_HDR_LEN); |
| goto invalid; |
| } |
| |
| flags = GET_U_1(bp); |
| bp += 1; |
| len -= 1; |
| ND_PRINT("flags [%s], ", |
| bittok2str_nosep(vxlan_gpe_flags, "none", flags)); |
| |
| /* Reserved */ |
| bp += 2; |
| len -= 2; |
| |
| next_protocol = GET_U_1(bp); |
| bp += 1; |
| len -= 1; |
| |
| vni = GET_BE_U_3(bp); |
| bp += 3; |
| len -= 3; |
| |
| /* Reserved */ |
| ND_TCHECK_1(bp); |
| bp += 1; |
| len -= 1; |
| |
| ND_PRINT("vni %u", vni); |
| ND_PRINT(ndo->ndo_vflag ? "\n " : ": "); |
| |
| switch (next_protocol) { |
| case 0x1: |
| ip_print(ndo, bp, len); |
| break; |
| case 0x2: |
| ip6_print(ndo, bp, len); |
| break; |
| case 0x3: |
| ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL); |
| break; |
| case 0x4: |
| nsh_print(ndo, bp, len); |
| break; |
| default: |
| ND_PRINT("ERROR: unknown-next-protocol"); |
| goto invalid; |
| } |
| |
| return; |
| |
| invalid: |
| nd_print_invalid(ndo); |
| } |
| |