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Diffstat (limited to 'print-geneve.c')
| -rw-r--r-- | print-geneve.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/print-geneve.c b/print-geneve.c new file mode 100644 index 0000000..0b7ff6e --- /dev/null +++ b/print-geneve.c @@ -0,0 +1,244 @@ +/* + * Copyright (c) 2014 VMware, Inc. All Rights Reserved. + * + * Jesse Gross <jesse@nicira.com> + * + * 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. + */ + +/* \summary: Generic Network Virtualization Encapsulation (Geneve) printer */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "netdissect-stdinc.h" + +#include "netdissect.h" +#include "extract.h" +#include "ethertype.h" + +/* + * Geneve header, draft-ietf-nvo3-geneve + * + * 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 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * |Ver| Opt Len |O|C| Rsvd. | Protocol Type | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Virtual Network Identifier (VNI) | Reserved | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Variable Length Options | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * + * Options: + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Option Class | Type |R|R|R| Length | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | Variable Option Data | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + */ + +#define VER_SHIFT 6 +#define HDR_OPTS_LEN_MASK 0x3F + +#define FLAG_OAM (1 << 7) +#define FLAG_CRITICAL (1 << 6) +#define FLAG_R1 (1 << 5) +#define FLAG_R2 (1 << 4) +#define FLAG_R3 (1 << 3) +#define FLAG_R4 (1 << 2) +#define FLAG_R5 (1 << 1) +#define FLAG_R6 (1 << 0) + +#define OPT_TYPE_CRITICAL (1 << 7) +#define OPT_LEN_MASK 0x1F + +static const struct tok geneve_flag_values[] = { + { FLAG_OAM, "O" }, + { FLAG_CRITICAL, "C" }, + { FLAG_R1, "R1" }, + { FLAG_R2, "R2" }, + { FLAG_R3, "R3" }, + { FLAG_R4, "R4" }, + { FLAG_R5, "R5" }, + { FLAG_R6, "R6" }, + { 0, NULL } +}; + +static const char * +format_opt_class(uint16_t opt_class) +{ + switch (opt_class) { + case 0x0100: + return "Linux"; + case 0x0101: + return "Open vSwitch"; + case 0x0102: + return "Open Virtual Networking (OVN)"; + case 0x0103: + return "In-band Network Telemetry (INT)"; + case 0x0104: + return "VMware"; + default: + if (opt_class <= 0x00ff) + return "Standard"; + else if (opt_class >= 0xfff0) + return "Experimental"; + } + + return "Unknown"; +} + +static void +geneve_opts_print(netdissect_options *ndo, const u_char *bp, u_int len) +{ + const char *sep = ""; + + while (len > 0) { + uint16_t opt_class; + uint8_t opt_type; + uint8_t opt_len; + + ND_PRINT("%s", sep); + sep = ", "; + + opt_class = GET_BE_U_2(bp); + opt_type = GET_U_1(bp + 2); + opt_len = 4 + ((GET_U_1(bp + 3) & OPT_LEN_MASK) * 4); + + ND_PRINT("class %s (0x%x) type 0x%x%s len %u", + format_opt_class(opt_class), opt_class, opt_type, + opt_type & OPT_TYPE_CRITICAL ? "(C)" : "", opt_len); + + if (opt_len > len) { + ND_PRINT(" [bad length]"); + return; + } + + if (ndo->ndo_vflag > 1 && opt_len > 4) { + const uint32_t *data = (const uint32_t *)(bp + 4); + int i; + + ND_PRINT(" data"); + + for (i = 4; i < opt_len; i += 4) { + ND_PRINT(" %08x", GET_BE_U_4(data)); + data++; + } + } + + bp += opt_len; + len -= opt_len; + } +} + +void +geneve_print(netdissect_options *ndo, const u_char *bp, u_int len) +{ + uint8_t ver_opt; + u_int version; + uint8_t flags; + uint16_t prot; + uint32_t vni; + uint8_t reserved; + u_int opts_len; + + ndo->ndo_protocol = "geneve"; + ND_PRINT("Geneve"); + + if (len < 8) { + ND_PRINT(" [length %u < 8]", len); + nd_print_invalid(ndo); + return; + } + + ND_TCHECK_8(bp); + + ver_opt = GET_U_1(bp); + bp += 1; + len -= 1; + + version = ver_opt >> VER_SHIFT; + if (version != 0) { + ND_PRINT(" ERROR: unknown-version %u", version); + return; + } + + flags = GET_U_1(bp); + bp += 1; + len -= 1; + + prot = GET_BE_U_2(bp); + bp += 2; + len -= 2; + + vni = GET_BE_U_3(bp); + bp += 3; + len -= 3; + + reserved = GET_U_1(bp); + bp += 1; + len -= 1; + + ND_PRINT(", Flags [%s]", + bittok2str_nosep(geneve_flag_values, "none", flags)); + ND_PRINT(", vni 0x%x", vni); + + if (reserved) + ND_PRINT(", rsvd 0x%x", reserved); + + if (ndo->ndo_eflag) + ND_PRINT(", proto %s (0x%04x)", + tok2str(ethertype_values, "unknown", prot), prot); + + opts_len = (ver_opt & HDR_OPTS_LEN_MASK) * 4; + + if (len < opts_len) { + ND_PRINT(" truncated-geneve - %u bytes missing", + opts_len - len); + return; + } + + ND_TCHECK_LEN(bp, opts_len); + + if (opts_len > 0) { + ND_PRINT(", options ["); + + if (ndo->ndo_vflag) + geneve_opts_print(ndo, bp, opts_len); + else + ND_PRINT("%u bytes", opts_len); + + ND_PRINT("]"); + } + + bp += opts_len; + len -= opts_len; + + if (ndo->ndo_vflag < 1) + ND_PRINT(": "); + else + ND_PRINT("\n\t"); + + if (ethertype_print(ndo, prot, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL) == 0) { + if (prot == ETHERTYPE_TEB) + ether_print(ndo, bp, len, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL); + else + ND_PRINT("geneve-proto-0x%x", prot); + } + + return; + +trunc: + nd_print_trunc(ndo); +} |