Makefile.in: don't remove configure and config.h.in in make distclean.

[tcpdump] / print-sll.c

diff --git a/print-sll.c b/print-sll.c
index 0a65a8bc68bde4b22453ba05c19ecb5b1acc8651..eb8d620a448b6806e011ee2bd4eb2b6a7c2d5a4e 100644 (file)
--- a/print-sll.c
+++ b/print-sll.c
@@ -18,30 +18,134 @@
  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
  * 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 1.16 2004-10-28 00:34:29 hannes Exp $ (LBL)";
-#endif
+
+/* \summary: Linux cooked sockets capture printer */

 
 #ifdef HAVE_CONFIG_H
 
 #ifdef HAVE_CONFIG_H

-#include "config.h"
+#include <config.h>

 #endif
 
 #endif
 

-#include <tcpdump-stdinc.h>
+#ifdef HAVE_NET_IF_H
+/*
+ * Include diag-control.h before <net/if.h>, which too defines a macro
+ * named ND_UNREACHABLE.
+ */
+#include "diag-control.h"
+#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 "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
+ * "[email protected]" for one, so that you don't give it
+ * 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

 
 

-const struct tok sll_pkttype_values[] = {
+/*
+ * 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" },
     { LINUX_SLL_BROADCAST, "B" },
     { LINUX_SLL_MULTICAST, "M" },
     { LINUX_SLL_HOST, "In" },
     { LINUX_SLL_BROADCAST, "B" },
     { LINUX_SLL_MULTICAST, "M" },


@@ -50,24 +154,61 @@ const struct tok sll_pkttype_values[] = {
     { 0, NULL}
 };
 
     { 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)

 {
 {

-        printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype)));
+       u_short ether_type;
+
+       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?
         */
 
        /*
         * 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 (!qflag)
-                (void)printf("ethertype %s (0x%04x), length %u: ",
-                         tok2str(ethertype_values,"Unknown", EXTRACT_16BITS(&sllp->sll_protocol)),
-                         EXTRACT_16BITS(&sllp->sll_protocol),
-                         length);
+       if (GET_BE_U_2(sllp->sll_halen) == MAC_ADDR_LEN)
+               ND_PRINT("%s ", GET_ETHERADDR_STRING(sllp->sll_addr));
+
+       if (!ndo->ndo_qflag) {
+               ether_type = GET_BE_U_2(sllp->sll_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;
+                       }
+               } else {
+                       ND_PRINT("ethertype %s (0x%04x)",
+                           tok2str(ethertype_values, "Unknown", ether_type),
+                           ether_type);
+               }
+               ND_PRINT(", length %u: ", length);
+       }

 }
 
 /*
 }
 
 /*


@@ -76,29 +217,24 @@ sll_print(register const struct sll_header *sllp, u_int length)
  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  * is the number of bytes actually captured.
  */
  * '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;
 {
        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 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;
 
 
        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.
 
        /*
         * Go past the cooked-mode header.


@@ -106,15 +242,28 @@ sll_if_print(const struct pcap_pkthdr *h, const u_char *p)
        length -= SLL_HDR_LEN;
        caplen -= SLL_HDR_LEN;
        p += SLL_HDR_LEN;
        length -= SLL_HDR_LEN;
        caplen -= SLL_HDR_LEN;
        p += SLL_HDR_LEN;

+       hdrlen = SLL_HDR_LEN;

 
 

-       ether_type = ntohs(sllp->sll_protocol);
+       hatype = GET_BE_U_2(sllp->sll_hatype);
+       switch (hatype) {

 
 

+       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?
         */
        /*
         * Is it (gag) an 802.3 encapsulation, or some non-Ethernet
         * packet type?
         */

-       extracted_ethertype = 0;
-       if (ether_type <= ETHERMTU) {
+       if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {

                /*
                 * Yes - what type is it?
                 */
                /*
                 * Yes - what type is it?
                 */


@@ -124,7 +273,7 @@ sll_if_print(const struct pcap_pkthdr *h, const u_char *p)
                        /*
                         * Ethernet_802.3 IPX frame.
                         */
                        /*
                         * Ethernet_802.3 IPX frame.
                         */

-                       ipx_print(p, length);
+                       ipx_print(ndo, p, length);

                        break;
 
                case LINUX_SLL_P_802_2:
                        break;
 
                case LINUX_SLL_P_802_2:


@@ -132,32 +281,255 @@ sll_if_print(const struct pcap_pkthdr *h, const u_char *p)
                         * 802.2.
                         * Try to print the LLC-layer header & higher layers.
                         */
                         * 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 */
                                goto unknown;   /* unknown LLC type */

+                       hdrlen += llc_hdrlen;

                        break;
 
                default:
                        break;
 
                default:

+                       /*FALLTHROUGH*/
+

                unknown:
                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 */
                        /* 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) == MAC_ADDR_LEN)
+               ND_PRINT("%s ", GET_ETHERADDR_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 (!xflag && !qflag)
-                               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.
+ */
+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 HAVE_NET_IF_H
+       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 HAVE_NET_IF_H
+       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;
                        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) {
+                       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 (!ndo->ndo_eflag)
+                               sll2_print(ndo, sllp, length + SLL2_HDR_LEN);
+                       if (!ndo->ndo_suppress_default_print)
+                               ND_DEFAULTPRINT(p, caplen);

                }
                }

-       } else if (ether_encap_print(ether_type, p, length, caplen,
-           &extracted_ethertype) == 0) {
-               /* ether_type not known, print raw packet */
-               if (!eflag)
-                       sll_print(sllp, length + SLL_HDR_LEN);
-               if (!xflag && !qflag)
-                       default_print(p, caplen);

        }
 
        }
 

-       return (SLL_HDR_LEN);
+       ndo->ndo_ll_hdr_len += hdrlen;

 }
 }