diff options
Diffstat (limited to 'print-vxlan.c')
-rw-r--r-- | print-vxlan.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/print-vxlan.c b/print-vxlan.c new file mode 100644 index 0000000000000..0c2a82e2afeda --- /dev/null +++ b/print-vxlan.c @@ -0,0 +1,74 @@ +/* + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that: (1) source code + * distributions retain the above copyright notice and this paragraph + * in its entirety, and (2) distributions including binary code include + * the above copyright notice and this paragraph in its entirety in + * the documentation or other materials provided with the distribution. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND + * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT + * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE. + * + * Original code by Francesco Fondelli (francesco dot fondelli, gmail dot com) + */ + +/* \summary: Virtual eXtensible Local Area Network (VXLAN) printer */ + +/* specification: RFC 7348 */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <netdissect-stdinc.h> + +#include "netdissect.h" +#include "extract.h" + +static const char tstr[] = " [|VXLAN]"; + +#define VXLAN_HDR_LEN 8 + +/* + * VXLAN header, RFC7348 + * Virtual eXtensible Local Area Network (VXLAN): A Framework + * for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks + * + * 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|R|R|I|R|R|R| Reserved | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | VXLAN Network Identifier (VNI) | Reserved | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + */ + +void +vxlan_print(netdissect_options *ndo, const u_char *bp, u_int len) +{ + uint8_t flags; + uint32_t vni; + + if (len < VXLAN_HDR_LEN) + goto trunc; + + ND_TCHECK2(*bp, VXLAN_HDR_LEN); + + flags = *bp; + bp += 4; + + vni = EXTRACT_24BITS(bp); + bp += 4; + + ND_PRINT((ndo, "VXLAN, ")); + ND_PRINT((ndo, "flags [%s] (0x%02x), ", flags & 0x08 ? "I" : ".", flags)); + ND_PRINT((ndo, "vni %u\n", vni)); + + ether_print(ndo, bp, len - VXLAN_HDR_LEN, ndo->ndo_snapend - bp, NULL, NULL); + + return; + +trunc: + ND_PRINT((ndo, "%s", tstr)); +} |