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Diffstat (limited to 'contrib/tcpdump/print-vxlan-gpe.c')
-rw-r--r-- | contrib/tcpdump/print-vxlan-gpe.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-vxlan-gpe.c b/contrib/tcpdump/print-vxlan-gpe.c new file mode 100644 index 0000000..6d170de --- /dev/null +++ b/contrib/tcpdump/print-vxlan-gpe.c @@ -0,0 +1,113 @@ +/* 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-01 */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <netdissect-stdinc.h> + +#include "netdissect.h" +#include "extract.h" + +static const char tstr[] = " [|VXLAN-GPE]"; +static const struct tok vxlan_gpe_flags [] = { + { 0x08, "I" }, + { 0x04, "P" }, + { 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; + + if (len < VXLAN_GPE_HDR_LEN) + goto trunc; + + ND_TCHECK2(*bp, VXLAN_GPE_HDR_LEN); + + flags = *bp; + bp += 3; + + next_protocol = *bp; + bp += 1; + + vni = EXTRACT_24BITS(bp); + bp += 4; + + ND_PRINT((ndo, "VXLAN-GPE, ")); + ND_PRINT((ndo, "flags [%s], ", + bittok2str_nosep(vxlan_gpe_flags, "none", flags))); + ND_PRINT((ndo, "vni %u", vni)); + ND_PRINT((ndo, ndo->ndo_vflag ? "\n " : ": ")); + + switch (next_protocol) { + case 0x1: + ip_print(ndo, bp, len - 8); + break; + case 0x2: + ip6_print(ndo, bp, len - 8); + break; + case 0x3: + ether_print(ndo, bp, len - 8, ndo->ndo_snapend - bp, NULL, NULL); + break; + case 0x4: + nsh_print(ndo, bp, len - 8); + break; + case 0x5: + mpls_print(ndo, bp, len - 8); + break; + default: + ND_PRINT((ndo, "ERROR: unknown-next-protocol")); + return; + } + + return; + +trunc: + ND_PRINT((ndo, "%s", tstr)); +} + |