* 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
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+/* \summary: Linux cooked sockets capture printer */
+
+#include <config.h>
-#include <tcpdump-stdinc.h>
+#ifdef __linux__
+#include <net/if.h>
+#endif
-#include <stdio.h>
-#include <string.h>
-#include <pcap.h>
+#include "netdissect-stdinc.h"
-#include "interface.h"
+#define ND_LONGJMP_FROM_TCHECK
+#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 {
+ nd_uint16_t sll_pkttype; /* packet type */
+ nd_uint16_t sll_hatype; /* link-layer address type */
+ nd_uint16_t sll_halen; /* link-layer address length */
+ nd_byte sll_addr[SLL_ADDRLEN]; /* link-layer address */
+ nd_uint16_t sll_protocol; /* protocol */
+};
+
+/*
+ * A DLT_LINUX_SLL2 fake link-layer header.
+ */
+#define SLL2_HDR_LEN 20 /* total header length */
+
+struct sll2_header {
+ nd_uint16_t sll2_protocol; /* protocol */
+ nd_uint16_t sll2_reserved_mbz; /* reserved - must be zero */
+ nd_uint32_t sll2_if_index; /* 1-based interface index */
+ nd_uint16_t sll2_hatype; /* link-layer address type */
+ nd_uint8_t sll2_pkttype; /* packet type */
+ nd_uint8_t sll2_halen; /* link-layer address length */
+ nd_byte sll2_addr[SLL_ADDRLEN]; /* link-layer address */
+};
+
+/*
+ * 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" },
{ 0, NULL}
};
-static inline void
-sll_print(register const struct sll_header *sllp, u_int length)
+static void
+sll_print(netdissect_options *ndo, const struct sll_header *sllp, u_int length)
{
u_short ether_type;
- printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype)));
+ ndo->ndo_protocol = "sll";
+ ND_PRINT("%3s ",
+ tok2str(sll_pkttype_values,"?",GET_BE_U_2(sllp->sll_pkttype)));
/*
* XXX - check the link-layer address type value?
* For now, we just assume 6 means Ethernet.
* XXX - print others as strings of hex?
*/
- if (EXTRACT_16BITS(&sllp->sll_halen) == 6)
- (void)printf("%s ", etheraddr_string(sllp->sll_addr));
+ if (GET_BE_U_2(sllp->sll_halen) == MAC48_LEN)
+ ND_PRINT("%s ", GET_MAC48_STRING(sllp->sll_addr));
- if (!qflag) {
- ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
+ if (!ndo->ndo_qflag) {
+ ether_type = GET_BE_U_2(sllp->sll_protocol);
- if (ether_type <= ETHERMTU) {
+ if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
/*
* Not an Ethernet type; what type is it?
*/
/*
* Ethernet_802.3 IPX frame.
*/
- (void)printf("802.3");
+ ND_PRINT("802.3");
break;
case LINUX_SLL_P_802_2:
/*
* 802.2.
*/
- (void)printf("802.2");
+ ND_PRINT("802.2");
break;
default:
/*
* What is it?
*/
- (void)printf("ethertype Unknown (0x%04x)",
+ ND_PRINT("ethertype Unknown (0x%04x)",
ether_type);
break;
}
} else {
- (void)printf("ethertype %s (0x%04x)",
+ ND_PRINT("ethertype %s (0x%04x)",
tok2str(ethertype_values, "Unknown", ether_type),
ether_type);
}
- (void)printf(", length %u: ", length);
+ ND_PRINT(", length %u: ", length);
}
}
* 'h->len' is the length of the packet off the wire, and 'h->caplen'
* is the number of bytes actually captured.
*/
-u_int
-sll_if_print(const struct pcap_pkthdr *h, const u_char *p)
+void
+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;
+ const struct sll_header *sllp;
+ u_short hatype;
u_short ether_type;
- u_short extracted_ethertype;
+ int llc_hdrlen;
+ u_int hdrlen;
- if (caplen < SLL_HDR_LEN) {
- /*
- * XXX - this "can't happen" because "pcap-linux.c" always
- * adds this many bytes of header to every packet in a
- * cooked socket capture.
- */
- printf("[|sll]");
- return (caplen);
- }
+ ndo->ndo_protocol = "sll";
+ ND_TCHECK_LEN(p, SLL_HDR_LEN);
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;
+
+ hatype = GET_BE_U_2(sllp->sll_hatype);
+ switch (hatype) {
- ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
+ case 803:
+ /*
+ * This is an packet with a radiotap header;
+ * just dissect the payload as such.
+ */
+ ndo->ndo_ll_hdr_len += SLL_HDR_LEN;
+ ndo->ndo_ll_hdr_len += ieee802_11_radio_print(ndo, p, length, caplen);
+ return;
+ }
+ ether_type = GET_BE_U_2(sllp->sll_protocol);
recurse:
/*
* Is it (gag) an 802.3 encapsulation, or some non-Ethernet
* packet type?
*/
- if (ether_type <= ETHERMTU) {
+ if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
/*
* Yes - what type is it?
*/
/*
* 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:
+ /* 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) {
+ ndo->ndo_protocol = "vlan";
+ nd_print_trunc(ndo);
+ ndo->ndo_ll_hdr_len += hdrlen + caplen;
+ return;
+ }
+ if (ndo->ndo_eflag) {
+ uint16_t tag = GET_BE_U_2(p);
+
+ ND_PRINT("%s, ", ieee8021q_tci_string(tag));
+ }
+
+ ether_type = GET_BE_U_2(p + 2);
+ if (ether_type <= MAX_ETHERNET_LENGTH_VAL)
+ ether_type = LINUX_SLL_P_802_2;
+ if (!ndo->ndo_qflag) {
+ ND_PRINT("ethertype %s, ",
+ tok2str(ethertype_values, "Unknown", ether_type));
+ }
+ p += 4;
+ length -= 4;
+ caplen -= 4;
+ hdrlen += 4;
+ goto recurse;
+ } else {
+ 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 (extracted_ethertype) {
- printf("(LLC %s) ",
- etherproto_string(htons(extracted_ethertype)));
+ if (!ndo->ndo_eflag)
+ sll_print(ndo, sllp, length + SLL_HDR_LEN);
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
+ }
+ }
+
+ ndo->ndo_ll_hdr_len += hdrlen;
+}
+
+static void
+sll2_print(netdissect_options *ndo, const struct sll2_header *sllp, u_int length)
+{
+ u_short ether_type;
+
+ ndo->ndo_protocol = "sll2";
+ ND_PRINT("ifindex %u ", GET_BE_U_4(sllp->sll2_if_index));
+
+ /*
+ * XXX - check the link-layer address type value?
+ * For now, we just assume 6 means Ethernet.
+ * XXX - print others as strings of hex?
+ */
+ if (GET_U_1(sllp->sll2_halen) == MAC48_LEN)
+ ND_PRINT("%s ", GET_MAC48_STRING(sllp->sll2_addr));
+
+ if (!ndo->ndo_qflag) {
+ ether_type = GET_BE_U_2(sllp->sll2_protocol);
+
+ if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
+ /*
+ * Not an Ethernet type; what type is it?
+ */
+ switch (ether_type) {
+
+ case LINUX_SLL_P_802_3:
+ /*
+ * Ethernet_802.3 IPX frame.
+ */
+ ND_PRINT("802.3");
+ break;
+
+ case LINUX_SLL_P_802_2:
+ /*
+ * 802.2.
+ */
+ ND_PRINT("802.2");
+ break;
+
+ default:
+ /*
+ * What is it?
+ */
+ ND_PRINT("ethertype Unknown (0x%04x)",
+ ether_type);
+ break;
}
- if (!suppress_default_print)
- default_print(p, caplen);
+ } else {
+ ND_PRINT("ethertype %s (0x%04x)",
+ tok2str(ethertype_values, "Unknown", ether_type),
+ ether_type);
+ }
+ ND_PRINT(", length %u: ", length);
+ }
+}
+
+/*
+ * This is the top level routine of the printer. 'p' points to the
+ * Linux "cooked capture" header of the packet, 'h->ts' is the timestamp,
+ * 'h->len' is the length of the packet off the wire, and 'h->caplen'
+ * is the number of bytes actually captured.
+ *
+ * On Linux, we attempt to look up the interface index and print the
+ * name of the interface on which the packet arrived or was sent.
+ *
+ * This look up is only likely to work well if done on the same machine
+ * as the one on which the capture was done, as the interface with a
+ * given index on the latter machine is unlikely to have the same
+ * name as the interface with that index on the former machine.
+ *
+ * As DLT_LINUX_SLL2 live captures are supported only on Linux, this
+ * means that if the machine on which we're reading the file isn't
+ * running Linux, it's probably not the machine that captured the file,
+ * so we don't bother trying to do the lookup on non-Linux machines.
+ */
+void
+sll2_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
+{
+ u_int caplen = h->caplen;
+ u_int length = h->len;
+ const struct sll2_header *sllp;
+ u_short hatype;
+ u_short ether_type;
+ int llc_hdrlen;
+ u_int hdrlen;
+#ifdef __linux__
+ uint32_t if_index;
+ char ifname[IF_NAMESIZE];
+#endif
+
+ ndo->ndo_protocol = "sll2";
+ ND_TCHECK_LEN(p, SLL2_HDR_LEN);
+
+ sllp = (const struct sll2_header *)p;
+#ifdef __linux__
+ if_index = GET_BE_U_4(sllp->sll2_if_index);
+ if (!if_indextoname(if_index, ifname))
+ strncpy(ifname, "?", 2);
+ ND_PRINT("%-5s ", ifname);
+#endif
+
+ ND_PRINT("%-3s ",
+ tok2str(sll_pkttype_values, "?", GET_U_1(sllp->sll2_pkttype)));
+
+ if (ndo->ndo_eflag)
+ sll2_print(ndo, sllp, length);
+
+ /*
+ * Go past the cooked-mode header.
+ */
+ length -= SLL2_HDR_LEN;
+ caplen -= SLL2_HDR_LEN;
+ p += SLL2_HDR_LEN;
+ hdrlen = SLL2_HDR_LEN;
+
+ hatype = GET_BE_U_2(sllp->sll2_hatype);
+ switch (hatype) {
+
+ case 803:
+ /*
+ * This is an packet with a radiotap header;
+ * just dissect the payload as such.
+ */
+ ndo->ndo_ll_hdr_len += SLL2_HDR_LEN;
+ ndo->ndo_ll_hdr_len += ieee802_11_radio_print(ndo, p, length, caplen);
+ return;
+ }
+ ether_type = GET_BE_U_2(sllp->sll2_protocol);
+
+recurse:
+ /*
+ * Is it (gag) an 802.3 encapsulation, or some non-Ethernet
+ * packet type?
+ */
+ if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
+ /*
+ * Yes - what type is it?
+ */
+ switch (ether_type) {
+
+ case LINUX_SLL_P_802_3:
+ /*
+ * Ethernet_802.3 IPX frame.
+ */
+ ipx_print(ndo, p, length);
+ break;
+
+ case LINUX_SLL_P_802_2:
+ /*
+ * 802.2.
+ * Try to print the LLC-layer header & higher layers.
+ */
+ llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
+ if (llc_hdrlen < 0)
+ goto unknown; /* unknown LLC type */
+ hdrlen += llc_hdrlen;
+ break;
+
+ default:
+ /*FALLTHROUGH*/
+
+ unknown:
+ /* 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) {
+ ndo->ndo_protocol = "vlan";
+ nd_print_trunc(ndo);
+ ndo->ndo_ll_hdr_len += hdrlen + caplen;
+ return;
}
- if (eflag) {
- u_int16_t tag = EXTRACT_16BITS(p);
+ if (ndo->ndo_eflag) {
+ uint16_t tag = GET_BE_U_2(p);
- printf("vlan %u, p %u%s, ",
- tag & 0xfff,
- tag >> 13,
- (tag & 0x1000) ? ", CFI" : "");
+ ND_PRINT("%s, ", ieee8021q_tci_string(tag));
}
- ether_type = EXTRACT_16BITS(p + 2);
- if (ether_type <= ETHERMTU)
+ ether_type = GET_BE_U_2(p + 2);
+ if (ether_type <= MAX_ETHERNET_LENGTH_VAL)
ether_type = LINUX_SLL_P_802_2;
- if (!qflag) {
- (void)printf("ethertype %s, ",
+ if (!ndo->ndo_qflag) {
+ ND_PRINT("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)
+ sll2_print(ndo, sllp, length + SLL2_HDR_LEN);
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p, caplen);
}
}
- return (SLL_HDR_LEN);
+ ndo->ndo_ll_hdr_len += hdrlen;
}
projects / tcpdump / blobdiff