* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.19 2005-11-13 12:12:43 guy Exp $ (LBL)";
-#endif
+
+/* \summary: Linux cooked sockets capture printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
-#include <stdio.h>
-#include <string.h>
-#include <pcap.h>
-
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
#include "ether.h"
-#include "sll.h"
+
+/*
+ * For captures on Linux cooked sockets, we construct a fake header
+ * that includes:
+ *
+ * a 2-byte "packet type" which is one of:
+ *
+ * LINUX_SLL_HOST packet was sent to us
+ * LINUX_SLL_BROADCAST packet was broadcast
+ * LINUX_SLL_MULTICAST packet was multicast
+ * LINUX_SLL_OTHERHOST packet was sent to somebody else
+ * LINUX_SLL_OUTGOING packet was sent *by* us;
+ *
+ * a 2-byte Ethernet protocol field;
+ *
+ * a 2-byte link-layer type;
+ *
+ * a 2-byte link-layer address length;
+ *
+ * an 8-byte source link-layer address, whose actual length is
+ * specified by the previous value.
+ *
+ * All fields except for the link-layer address are in network byte order.
+ *
+ * DO NOT change the layout of this structure, or change any of the
+ * LINUX_SLL_ values below. If you must change the link-layer header
+ * for a "cooked" Linux capture, introduce a new DLT_ type (ask
+ * a value that collides with a value already being used), and use the
+ * new header in captures of that type, so that programs that can
+ * handle DLT_LINUX_SLL captures will continue to handle them correctly
+ * without any change, and so that capture files with different headers
+ * can be told apart and programs that read them can dissect the
+ * packets in them.
+ *
+ * This structure, and the #defines below, must be the same in the
+ * libpcap and tcpdump versions of "sll.h".
+ */
+
+/*
+ * A DLT_LINUX_SLL fake link-layer header.
+ */
+#define SLL_HDR_LEN 16 /* total header length */
+#define SLL_ADDRLEN 8 /* length of address field */
+
+struct sll_header {
+ uint16_t sll_pkttype; /* packet type */
+ uint16_t sll_hatype; /* link-layer address type */
+ uint16_t sll_halen; /* link-layer address length */
+ uint8_t sll_addr[SLL_ADDRLEN]; /* link-layer address */
+ uint16_t sll_protocol; /* protocol */
+};
+
+/*
+ * The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
+ * PACKET_ values on Linux, but are defined here so that they're
+ * available even on systems other than Linux, and so that they
+ * don't change even if the PACKET_ values change.
+ */
+#define LINUX_SLL_HOST 0
+#define LINUX_SLL_BROADCAST 1
+#define LINUX_SLL_MULTICAST 2
+#define LINUX_SLL_OTHERHOST 3
+#define LINUX_SLL_OUTGOING 4
+
+/*
+ * The LINUX_SLL_ values for "sll_protocol"; these correspond to the
+ * ETH_P_ values on Linux, but are defined here so that they're
+ * available even on systems other than Linux. We assume, for now,
+ * that the ETH_P_ values won't change in Linux; if they do, then:
+ *
+ * if we don't translate them in "pcap-linux.c", capture files
+ * won't necessarily be readable if captured on a system that
+ * defines ETH_P_ values that don't match these values;
+ *
+ * if we do translate them in "pcap-linux.c", that makes life
+ * unpleasant for the BPF code generator, as the values you test
+ * for in the kernel aren't the values that you test for when
+ * reading a capture file, so the fixup code run on BPF programs
+ * handed to the kernel ends up having to do more work.
+ *
+ * Add other values here as necessary, for handling packet types that
+ * might show up on non-Ethernet, non-802.x networks. (Not all the ones
+ * in the Linux "if_ether.h" will, I suspect, actually show up in
+ * captures.)
+ */
+#define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */
+#define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */
static const struct tok sll_pkttype_values[] = {
{ LINUX_SLL_HOST, "In" },
};
static inline void
-sll_print(register const struct sll_header *sllp, u_int length)
+sll_print(netdissect_options *ndo, register const struct sll_header *sllp, u_int length)
{
u_short ether_type;
- printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype)));
+ ND_PRINT((ndo, "%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype))));
/*
* XXX - check the link-layer address type value?
* XXX - print others as strings of hex?
*/
if (EXTRACT_16BITS(&sllp->sll_halen) == 6)
- (void)printf("%s ", etheraddr_string(sllp->sll_addr));
+ ND_PRINT((ndo, "%s ", etheraddr_string(ndo, sllp->sll_addr)));
- if (!qflag) {
+ if (!ndo->ndo_qflag) {
ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
if (ether_type <= ETHERMTU) {
/*
* Ethernet_802.3 IPX frame.
*/
- (void)printf("802.3");
+ ND_PRINT((ndo, "802.3"));
break;
case LINUX_SLL_P_802_2:
/*
* 802.2.
*/
- (void)printf("802.2");
+ ND_PRINT((ndo, "802.2"));
break;
default:
/*
* What is it?
*/
- (void)printf("ethertype Unknown (0x%04x)",
- ether_type);
+ ND_PRINT((ndo, "ethertype Unknown (0x%04x)",
+ ether_type));
break;
}
} else {
- (void)printf("ethertype %s (0x%04x)",
+ ND_PRINT((ndo, "ethertype %s (0x%04x)",
tok2str(ethertype_values, "Unknown", ether_type),
- ether_type);
+ ether_type));
}
- (void)printf(", length %u: ", length);
+ ND_PRINT((ndo, ", length %u: ", length));
}
}
* is the number of bytes actually captured.
*/
u_int
-sll_if_print(const struct pcap_pkthdr *h, const u_char *p)
+sll_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
register const struct sll_header *sllp;
u_short ether_type;
- u_short extracted_ethertype;
+ int llc_hdrlen;
+ u_int hdrlen;
if (caplen < SLL_HDR_LEN) {
/*
* adds this many bytes of header to every packet in a
* cooked socket capture.
*/
- printf("[|sll]");
+ ND_PRINT((ndo, "[|sll]"));
return (caplen);
}
sllp = (const struct sll_header *)p;
- if (eflag)
- sll_print(sllp, length);
+ if (ndo->ndo_eflag)
+ sll_print(ndo, sllp, length);
/*
* Go past the cooked-mode header.
length -= SLL_HDR_LEN;
caplen -= SLL_HDR_LEN;
p += SLL_HDR_LEN;
+ hdrlen = SLL_HDR_LEN;
ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
/*
* Ethernet_802.3 IPX frame.
*/
- ipx_print(p, length);
+ ipx_print(ndo, p, length);
break;
case LINUX_SLL_P_802_2:
* 802.2.
* Try to print the LLC-layer header & higher layers.
*/
- if (llc_print(p, length, caplen, NULL, NULL,
- &extracted_ethertype) == 0)
+ llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
+ if (llc_hdrlen < 0)
goto unknown; /* unknown LLC type */
+ hdrlen += llc_hdrlen;
break;
default:
- extracted_ethertype = 0;
/*FALLTHROUGH*/
unknown:
- /* ether_type not known, print raw packet */
- if (!eflag)
- sll_print(sllp, length + SLL_HDR_LEN);
- if (extracted_ethertype) {
- printf("(LLC %s) ",
- etherproto_string(htons(extracted_ethertype)));
- }
- if (!suppress_default_print)
- default_print(p, caplen);
+ /* packet type not known, print raw packet */
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
break;
}
} else if (ether_type == ETHERTYPE_8021Q) {
* Print VLAN information, and then go back and process
* the enclosed type field.
*/
- if (caplen < 4 || length < 4) {
- printf("[|vlan]");
- return (SLL_HDR_LEN);
+ if (caplen < 4) {
+ ND_PRINT((ndo, "[|vlan]"));
+ return (hdrlen + caplen);
+ }
+ if (length < 4) {
+ ND_PRINT((ndo, "[|vlan]"));
+ return (hdrlen + length);
}
- if (eflag) {
- u_int16_t tag = EXTRACT_16BITS(p);
+ if (ndo->ndo_eflag) {
+ uint16_t tag = EXTRACT_16BITS(p);
- printf("vlan %u, p %u%s, ",
- tag & 0xfff,
- tag >> 13,
- (tag & 0x1000) ? ", CFI" : "");
+ ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
}
ether_type = EXTRACT_16BITS(p + 2);
if (ether_type <= ETHERMTU)
ether_type = LINUX_SLL_P_802_2;
- if (!qflag) {
- (void)printf("ethertype %s, ",
- tok2str(ethertype_values, "Unknown", ether_type));
+ if (!ndo->ndo_qflag) {
+ ND_PRINT((ndo, "ethertype %s, ",
+ tok2str(ethertype_values, "Unknown", ether_type)));
}
p += 4;
length -= 4;
caplen -= 4;
+ hdrlen += 4;
goto recurse;
} else {
- if (ethertype_print(gndo, ether_type, p, length, caplen) == 0) {
+ if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
/* ether_type not known, print raw packet */
- if (!eflag)
- sll_print(sllp, length + SLL_HDR_LEN);
- if (!suppress_default_print)
- default_print(p, caplen);
+ if (!ndo->ndo_eflag)
+ sll_print(ndo, sllp, length + SLL_HDR_LEN);
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
}
}
- return (SLL_HDR_LEN);
+ return (hdrlen);
}
projects / tcpdump / blobdiff