{ ETHERTYPE_GEONET, "GeoNet"},
{ ETHERTYPE_CALM_FAST, "CALM FAST"},
{ ETHERTYPE_AOE, "AoE" },
- { ETHERTYPE_MEDSA, "MEDSA" },
+ { ETHERTYPE_PTP, "PTP" },
+ { ETHERTYPE_ARISTA, "Arista Vendor Specific Protocol" },
{ 0, NULL}
};
static void
-ether_hdr_print(netdissect_options *ndo,
- const u_char *bp, u_int length,
- u_int hdrlen)
+ether_addresses_print(netdissect_options *ndo, const u_char *src,
+ const u_char *dst)
{
- const struct ether_header *ehp;
- uint16_t length_type;
-
- ehp = (const struct ether_header *)bp;
-
- ND_PRINT("%s > %s",
- etheraddr_string(ndo, ehp->ether_shost),
- etheraddr_string(ndo, ehp->ether_dhost));
-
- length_type = GET_BE_U_2(bp + (hdrlen - sizeof(ehp->ether_length_type)));
- if (!ndo->ndo_qflag) {
- if (length_type <= MAX_ETHERNET_LENGTH_VAL) {
- ND_PRINT(", 802.3");
- length = length_type;
- } else
- ND_PRINT(", ethertype %s (0x%04x)",
- tok2str(ethertype_values,"Unknown", length_type),
- length_type);
- } else {
- if (length_type <= MAX_ETHERNET_LENGTH_VAL) {
- ND_PRINT(", 802.3");
- length = length_type;
- } else
- ND_PRINT(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", length_type));
- }
+ ND_PRINT("%s > %s, ",
+ GET_ETHERADDR_STRING(src), GET_ETHERADDR_STRING(dst));
+}
- ND_PRINT(", length %u: ", length);
+static void
+ether_type_print(netdissect_options *ndo, uint16_t type)
+{
+ if (!ndo->ndo_qflag)
+ ND_PRINT("ethertype %s (0x%04x)",
+ tok2str(ethertype_values, "Unknown", type), type);
+ else
+ ND_PRINT("%s",
+ tok2str(ethertype_values, "Unknown Ethertype (0x%04x)", type));
}
/*
- * Print an Ethernet frame while specyfing a non-standard Ethernet header
- * length.
- * This might be encapsulated within another frame; we might be passed
- * a pointer to a function that can print header information for that
- * frame's protocol, and an argument to pass to that function.
+ * Common code for printing Ethernet frames.
*
- * FIXME: caplen can and should be derived from ndo->ndo_snapend and p.
+ * It can handle Ethernet headers with extra tag information inserted
+ * after the destination and source addresses, as is inserted by some
+ * switch chips, and extra encapsulation header information before
+ * printing Ethernet header information (such as a LANE ID for ATM LANE).
*/
-u_int
-ether_print_hdr_len(netdissect_options *ndo,
- const u_char *p, u_int length, u_int caplen,
- void (*print_encap_header)(netdissect_options *ndo, const u_char *),
- const u_char *encap_header_arg, u_int hdrlen)
+static u_int
+ether_print_common(netdissect_options *ndo, const u_char *p, u_int length,
+ u_int caplen,
+ void (*print_switch_tag)(netdissect_options *ndo, const u_char *),
+ u_int switch_tag_len,
+ void (*print_encap_header)(netdissect_options *ndo, const u_char *),
+ const u_char *encap_header_arg)
{
const struct ether_header *ehp;
u_int orig_length;
+ u_int hdrlen;
u_short length_type;
+ int printed_length;
int llc_hdrlen;
struct lladdr_info src, dst;
- /* Unless specified otherwise, assume a standard Ethernet header */
- if (hdrlen == ETHER_HDRLEN)
- ndo->ndo_protocol = "ether";
-
- if (caplen < hdrlen) {
+ if (caplen < ETHER_HDRLEN + switch_tag_len) {
nd_print_trunc(ndo);
return (caplen);
}
- if (length < hdrlen) {
+ if (length < ETHER_HDRLEN + switch_tag_len) {
nd_print_trunc(ndo);
return (length);
}
- /* If the offset is set, then the upper printer is responsible for
- * printing the relevant part of the Ethernet header.
- */
- if (ndo->ndo_eflag) {
- if (print_encap_header != NULL)
- (*print_encap_header)(ndo, encap_header_arg);
- ether_hdr_print(ndo, p, length, hdrlen);
- }
+ if (print_encap_header != NULL)
+ (*print_encap_header)(ndo, encap_header_arg);
orig_length = length;
- length -= hdrlen;
- caplen -= hdrlen;
+ /*
+ * Get the source and destination addresses, skip past them,
+ * and print them if we're printing the link-layer header.
+ */
ehp = (const struct ether_header *)p;
- p += hdrlen;
-
src.addr = ehp->ether_shost;
src.addr_string = etheraddr_string;
dst.addr = ehp->ether_dhost;
dst.addr_string = etheraddr_string;
- length_type = GET_BE_U_2((const u_char *)ehp + (hdrlen - sizeof(ehp->ether_length_type)));
+ length -= 2*MAC_ADDR_LEN;
+ caplen -= 2*MAC_ADDR_LEN;
+ p += 2*MAC_ADDR_LEN;
+ hdrlen = 2*MAC_ADDR_LEN;
+
+ if (ndo->ndo_eflag)
+ ether_addresses_print(ndo, src.addr, dst.addr);
+
+ /*
+ * Print the switch tag, if we have one, and skip past it.
+ */
+ if (print_switch_tag != NULL)
+ (*print_switch_tag)(ndo, p);
+
+ length -= switch_tag_len;
+ caplen -= switch_tag_len;
+ p += switch_tag_len;
+ hdrlen += switch_tag_len;
+
+ /*
+ * Get the length/type field, skip past it, and print it
+ * if we're printing the link-layer header.
+ */
recurse:
+ length_type = GET_BE_U_2(p);
+
+ length -= 2;
+ caplen -= 2;
+ p += 2;
+ hdrlen += 2;
+
/*
- * Is it (gag) an 802.3 encapsulation?
+ * Process VLAN tag types.
*/
- if (length_type <= MAX_ETHERNET_LENGTH_VAL) {
- /* Try to print the LLC-layer header & higher layers */
- llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
- if (llc_hdrlen < 0) {
- /* packet type not known, print raw packet */
- if (!ndo->ndo_suppress_default_print)
- ND_DEFAULTPRINT(p, caplen);
- llc_hdrlen = -llc_hdrlen;
- }
- hdrlen += llc_hdrlen;
- } else if (length_type == ETHERTYPE_8021Q ||
+ printed_length = 0;
+ while (length_type == ETHERTYPE_8021Q ||
length_type == ETHERTYPE_8021Q9100 ||
length_type == ETHERTYPE_8021Q9200 ||
length_type == ETHERTYPE_8021QinQ) {
/*
+ * It has a VLAN tag.
* Print VLAN information, and then go back and process
* the enclosed type field.
*/
if (ndo->ndo_eflag) {
uint16_t tag = GET_BE_U_2(p);
+ ether_type_print(ndo, length_type);
+ if (!printed_length) {
+ ND_PRINT(", length %u: ", orig_length);
+ printed_length = 1;
+ } else
+ ND_PRINT(", ");
ND_PRINT("%s, ", ieee8021q_tci_string(tag));
}
length_type = GET_BE_U_2(p + 2);
- if (ndo->ndo_eflag && length_type > MAX_ETHERNET_LENGTH_VAL)
- ND_PRINT("ethertype %s, ", tok2str(ethertype_values,"0x%04x", length_type));
p += 4;
length -= 4;
caplen -= 4;
hdrlen += 4;
- goto recurse;
+ }
+
+ /*
+ * We now have the final length/type field.
+ */
+ if (length_type <= MAX_ETHERNET_LENGTH_VAL) {
+ /*
+ * It's a length field, containing the length of the
+ * remaining payload; use it as such, as long as
+ * it's not too large (bigger than the actual payload).
+ */
+ if (length_type < length) {
+ length = length_type;
+ if (caplen > length)
+ caplen = length;
+ }
+
+ /*
+ * Cut off the snapshot length to the end of the
+ * payload.
+ */
+ nd_push_snapend(ndo, p + length);
+
+ if (ndo->ndo_eflag) {
+ ND_PRINT("802.3");
+ if (!printed_length)
+ ND_PRINT(", length %u: ", length);
+ }
+
+ /*
+ * An LLC header follows the length. Print that and
+ * higher layers.
+ */
+ llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
+ if (llc_hdrlen < 0) {
+ /* packet type not known, print raw packet */
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
+ llc_hdrlen = -llc_hdrlen;
+ }
+ hdrlen += llc_hdrlen;
+ nd_pop_packet_info(ndo);
} else if (length_type == ETHERTYPE_JUMBO) {
/*
- * Alteon jumbo frames.
+ * It's a type field, with the type for Alteon jumbo frames.
* See
*
- * http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
+ * https://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
*
* which indicates that, following the type field,
* there's an LLC header and payload.
llc_hdrlen = -llc_hdrlen;
}
hdrlen += llc_hdrlen;
+ } else if (length_type == ETHERTYPE_ARISTA) {
+ if (caplen < 2) {
+ ND_PRINT("[|arista]");
+ return (hdrlen + caplen);
+ }
+ if (length < 2) {
+ ND_PRINT("[|arista]");
+ return (hdrlen + length);
+ }
+ ether_type_print(ndo, length_type);
+ ND_PRINT(", length %u: ", orig_length);
+ int bytesConsumed = arista_ethertype_print(ndo, p, length);
+ if (bytesConsumed > 0) {
+ p += bytesConsumed;
+ length -= bytesConsumed;
+ caplen -= bytesConsumed;
+ hdrlen += bytesConsumed;
+ goto recurse;
+ } else {
+ /* subtype/version not known, print raw packet */
+ if (!ndo->ndo_eflag && length_type > MAX_ETHERNET_LENGTH_VAL) {
+ ether_addresses_print(ndo, src.addr, dst.addr);
+ ether_type_print(ndo, length_type);
+ ND_PRINT(", length %u: ", orig_length);
+ }
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
+ }
} else {
+ /*
+ * It's a type field with some other value.
+ */
+ if (ndo->ndo_eflag) {
+ ether_type_print(ndo, length_type);
+ if (!printed_length)
+ ND_PRINT(", length %u: ", orig_length);
+ else
+ ND_PRINT(", ");
+ }
if (ethertype_print(ndo, length_type, p, length, caplen, &src, &dst) == 0) {
/* type not known, print raw packet */
if (!ndo->ndo_eflag) {
- if (print_encap_header != NULL)
- (*print_encap_header)(ndo, encap_header_arg);
- ether_hdr_print(ndo, (const u_char *)ehp, orig_length,
- hdrlen);
+ /*
+ * We didn't print the full link-layer
+ * header, as -e wasn't specified, so
+ * print only the source and destination
+ * MAC addresses and the final Ethernet
+ * type.
+ */
+ ether_addresses_print(ndo, src.addr, dst.addr);
+ ether_type_print(ndo, length_type);
+ ND_PRINT(", length %u: ", orig_length);
}
if (!ndo->ndo_suppress_default_print)
return (hdrlen);
}
+/*
+ * Print an Ethernet frame while specyfing a non-standard Ethernet header
+ * length.
+ * This might be encapsulated within another frame; we might be passed
+ * a pointer to a function that can print header information for that
+ * frame's protocol, and an argument to pass to that function.
+ *
+ * FIXME: caplen can and should be derived from ndo->ndo_snapend and p.
+ */
+u_int
+ether_print_switch_tag(netdissect_options *ndo, const u_char *p, u_int length,
+ u_int caplen,
+ void (*print_switch_tag)(netdissect_options *, const u_char *),
+ u_int switch_tag_len)
+{
+ return (ether_print_common(ndo, p, length, caplen, print_switch_tag,
+ switch_tag_len, NULL, NULL));
+}
+
/*
* Print an Ethernet frame.
* This might be encapsulated within another frame; we might be passed
void (*print_encap_header)(netdissect_options *ndo, const u_char *),
const u_char *encap_header_arg)
{
- return (ether_print_hdr_len(ndo, p, length, caplen,
- print_encap_header, encap_header_arg,
- ETHER_HDRLEN));
+ ndo->ndo_protocol = "ether";
+ return (ether_print_common(ndo, p, length, caplen, NULL, 0,
+ print_encap_header, encap_header_arg));
}
/*
aoe_print(ndo, p, length);
return (1);
- case ETHERTYPE_MEDSA:
- medsa_print(ndo, p, length, caplen, src, dst);
+ case ETHERTYPE_PTP:
+ ptp_print(ndo, p, length);
return (1);
case ETHERTYPE_LAT:
projects / tcpdump / blobdiff