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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 17:13:01 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 17:13:01 +0000 |
commit | 7adcb5b605cc1328a3084c334f4697ec9771936c (patch) | |
tree | 03e681bfda053978ba896745828e09cb056ad156 /print-vxlan-gpe.c | |
parent | Initial commit. (diff) | |
download | tcpdump-upstream.tar.xz tcpdump-upstream.zip |
Adding upstream version 4.99.4.upstream/4.99.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'print-vxlan-gpe.c')
-rw-r--r-- | print-vxlan-gpe.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/print-vxlan-gpe.c b/print-vxlan-gpe.c new file mode 100644 index 0000000..13cba42 --- /dev/null +++ b/print-vxlan-gpe.c @@ -0,0 +1,124 @@ +/* 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); +} + |