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      1 /* Copyright (c) 2015, bugyo
      2  * All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are met:
      6  * 1. Redistributions of source code must retain the above copyright notice,
      7  *    this list of conditions and the following disclaimer.
      8  * 2. Redistributions in binary form must reproduce the above copyright notice,
      9  *    this list of conditions and the following disclaimer in the documentation
     10  *    and/or other materials provided with the distribution.
     11  *
     12  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
     13  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     14  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     15  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
     16  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     17  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     18  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     19  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     20  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     21  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     22  */
     23 
     24 #include <sys/cdefs.h>
     25 #ifndef lint
     26 __RCSID("$NetBSD: print-vxlan-gpe.c,v 1.5 2024/09/02 16:15:33 christos Exp $");
     27 #endif
     28 
     29 /* \summary: Generic Protocol Extension for VXLAN (VXLAN GPE) printer */
     30 
     31 /* specification: draft-ietf-nvo3-vxlan-gpe-10 */
     32 
     33 #include <config.h>
     34 
     35 #include "netdissect-stdinc.h"
     36 
     37 #define ND_LONGJMP_FROM_TCHECK
     38 #include "netdissect.h"
     39 #include "extract.h"
     40 
     41 static const struct tok vxlan_gpe_flags [] = {
     42     { 0x08, "I" },
     43     { 0x04, "P" },
     44     { 0x02, "B" },
     45     { 0x01, "O" },
     46     { 0, NULL }
     47 };
     48 
     49 #define VXLAN_GPE_HDR_LEN 8
     50 
     51 /*
     52  * VXLAN GPE header, draft-ietf-nvo3-vxlan-gpe-01
     53  *                   Generic Protocol Extension for VXLAN
     54  *
     55  *     0                   1                   2                   3
     56  *     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
     57  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     58  *    |R|R|Ver|I|P|R|O|       Reserved                |Next Protocol  |
     59  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     60  *    |                VXLAN Network Identifier (VNI) |   Reserved    |
     61  *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     62  */
     63 
     64 void
     65 vxlan_gpe_print(netdissect_options *ndo, const u_char *bp, u_int len)
     66 {
     67     uint8_t flags;
     68     uint8_t next_protocol;
     69     uint32_t vni;
     70 
     71     ndo->ndo_protocol = "vxlan_gpe";
     72     ND_PRINT("VXLAN-GPE, ");
     73     if (len < VXLAN_GPE_HDR_LEN) {
     74         ND_PRINT(" (len %u < %u)", len, VXLAN_GPE_HDR_LEN);
     75         goto invalid;
     76     }
     77 
     78     flags = GET_U_1(bp);
     79     bp += 1;
     80     len -= 1;
     81     ND_PRINT("flags [%s], ",
     82               bittok2str_nosep(vxlan_gpe_flags, "none", flags));
     83 
     84     /* Reserved */
     85     bp += 2;
     86     len -= 2;
     87 
     88     next_protocol = GET_U_1(bp);
     89     bp += 1;
     90     len -= 1;
     91 
     92     vni = GET_BE_U_3(bp);
     93     bp += 3;
     94     len -= 3;
     95 
     96     /* Reserved */
     97     ND_TCHECK_1(bp);
     98     bp += 1;
     99     len -= 1;
    100 
    101     ND_PRINT("vni %u", vni);
    102     ND_PRINT(ndo->ndo_vflag ? "\n    " : ": ");
    103 
    104     switch (next_protocol) {
    105     case 0x1:
    106         ip_print(ndo, bp, len);
    107         break;
    108     case 0x2:
    109         ip6_print(ndo, bp, len);
    110         break;
    111     case 0x3:
    112         ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
    113         break;
    114     case 0x4:
    115         nsh_print(ndo, bp, len);
    116         break;
    117     default:
    118         ND_PRINT("ERROR: unknown-next-protocol");
    119         goto invalid;
    120     }
    121 
    122 	return;
    123 
    124 invalid:
    125     nd_print_invalid(ndo);
    126 }
    127 
    128