Regenerate config files.

[tcpdump] / print-sll.c

diff --git a/print-sll.c b/print-sll.c
index 836140fdd3698f1b1ec53ec667764e13d6e27c00..6148569ec160802ca48001223953ff1a16716b1e 100644 (file)
--- a/print-sll.c
+++ b/print-sll.c
@@ -18,100 +18,189 @@
  * 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[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.6 2001-07-05 18:54:18 guy Exp $ (LBL)";
-#endif
+
+/* \summary: Linux cooked sockets capture printer */

 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 

-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-
-struct mbuf;
-struct rtentry;
-
-#include <netinet/in.h>
-
-#include <stdio.h>
-#include <string.h>
-#include <pcap.h>
+#include <netdissect-stdinc.h>

 
 

-#include "interface.h"
+#include "netdissect.h"

 #include "addrtoname.h"
 #include "ethertype.h"
 #include "addrtoname.h"
 #include "ethertype.h"

+#include "extract.h"

 
 #include "ether.h"
 
 #include "ether.h"

-#include "sll.h"

 
 

-static inline void
-sll_print(register const struct sll_header *sllp, u_int length)
-{
-       u_short halen;
-
-       switch (ntohs(sllp->sll_pkttype)) {
+/*
+ * 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".
+ */

 
 

-       case LINUX_SLL_HOST:
-               (void)printf("< ");
-               break;
+/*
+ * A DLT_LINUX_SLL fake link-layer header.
+ */
+#define SLL_HDR_LEN    16              /* total header length */
+#define SLL_ADDRLEN    8               /* length of address field */

 
 

-       case LINUX_SLL_BROADCAST:
-               (void)printf("B ");
-               break;
+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 */
+};

 
 

-       case LINUX_SLL_MULTICAST:
-               (void)printf("M ");
-               break;
+/*
+ * 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

 
 

-       case LINUX_SLL_OTHERHOST:
-               (void)printf("P ");
-               break;
+/*
+ * 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_OTHERHOST, "P" },
+    { LINUX_SLL_OUTGOING, "Out" },
+    { 0, NULL}
+};

 
 

-       case LINUX_SLL_OUTGOING:
-               (void)printf("> ");
-               break;
+static inline void
+sll_print(netdissect_options *ndo, register const struct sll_header *sllp, u_int length)
+{
+       u_short ether_type;

 
 

-       default:
-               (void)printf("? ");
-               break;
-       }
+        ND_PRINT((ndo, "%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&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?
         */

-       halen = ntohs(sllp->sll_halen);
-       if (halen == 6)
-               (void)printf("%s ", etheraddr_string(sllp->sll_addr));
+       if (EXTRACT_16BITS(&sllp->sll_halen) == 6)
+               ND_PRINT((ndo, "%s ", etheraddr_string(ndo, sllp->sll_addr)));
+
+       if (!ndo->ndo_qflag) {
+               ether_type = EXTRACT_16BITS(&sllp->sll_protocol);

 
 

-       if (!qflag)
-               (void)printf("%s ", etherproto_string(sllp->sll_protocol));
-       (void)printf("%d: ", length);
+               if (ether_type <= ETHERMTU) {
+                       /*
+                        * Not an Ethernet type; what type is it?
+                        */
+                       switch (ether_type) {
+
+                       case LINUX_SLL_P_802_3:
+                               /*
+                                * Ethernet_802.3 IPX frame.
+                                */
+                               ND_PRINT((ndo, "802.3"));
+                               break;
+
+                       case LINUX_SLL_P_802_2:
+                               /*
+                                * 802.2.
+                                */
+                               ND_PRINT((ndo, "802.2"));
+                               break;
+
+                       default:
+                               /*
+                                * What is it?
+                                */
+                               ND_PRINT((ndo, "ethertype Unknown (0x%04x)",
+                                   ether_type));
+                               break;
+                       }
+               } else {
+                       ND_PRINT((ndo, "ethertype %s (0x%04x)",
+                           tok2str(ethertype_values, "Unknown", ether_type),
+                           ether_type));
+               }
+               ND_PRINT((ndo, ", length %u: ", length));
+       }

 }
 
 /*
 }
 
 /*

- * This is the top level routine of the printer.  'p' is the points
- * to the ether header of the packet, 'h->tv' is the timestamp,
- * 'h->length' is the length of the packet off the wire, and 'h->caplen'
+ * 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.
  */
  * is the number of bytes actually captured.
  */

-void
-sll_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
+u_int
+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_int caplen = h->caplen;
        u_int length = h->len;
        register const struct sll_header *sllp;

-       u_short pkttype;
-       struct ether_header ehdr;

        u_short ether_type;
        u_short ether_type;

-       u_short extracted_ethertype;
-
-       ++infodelay;
-       ts_print(&h->ts);
+       int llc_hdrlen;
+       u_int hdrlen;

 
        if (caplen < SLL_HDR_LEN) {
                /*
 
        if (caplen < SLL_HDR_LEN) {
                /*


@@ -119,79 +208,30 @@ sll_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
                 * adds this many bytes of header to every packet in a
                 * cooked socket capture.
                 */
                 * adds this many bytes of header to every packet in a
                 * cooked socket capture.
                 */

-               printf("[|sll]");
-               goto out;
+               ND_PRINT((ndo, "[|sll]"));
+               return (caplen);

        }
 
        sllp = (const struct sll_header *)p;
 
        }
 
        sllp = (const struct sll_header *)p;
 

-       /*
-        * Fake up an Ethernet header for the benefit of printers that
-        * insist on "packetp" pointing to an Ethernet header.
-        */
-       pkttype = ntohs(sllp->sll_pkttype);
-
-       /* The source address is in the packet header */
-       memcpy(ehdr.ether_shost, sllp->sll_addr, ETHER_ADDR_LEN);
+       if (ndo->ndo_eflag)
+               sll_print(ndo, sllp, length);

 
 

-       if (pkttype != LINUX_SLL_OUTGOING) {
-               /*
-                * We received this packet.
-                *
-                * We don't know the destination address, so
-                * we fake it - all 0's except that the
-                * bottommost bit of the bottommost octet
-                * is set for a unicast packet, all 0's except
-                * that the bottommost bit of the uppermost
-                * octet is set for a multicast packet, all
-                * 1's for a broadcast packet.
-                */
-               if (pkttype == LINUX_SLL_BROADCAST)
-                       memset(ehdr.ether_dhost, 0xFF, ETHER_ADDR_LEN);
-               else {
-                       memset(ehdr.ether_dhost, 0, ETHER_ADDR_LEN);
-                       if (pkttype == LINUX_SLL_MULTICAST)
-                               ehdr.ether_dhost[0] = 1;
-                       else
-                               ehdr.ether_dhost[ETHER_ADDR_LEN-1] = 1;
-               }
-       } else {
-               /*
-                * We sent this packet; we don't know whether it's
-                * broadcast, multicast, or unicast, so just make
-                * the destination address all 0's.
-                */
-               memset(ehdr.ether_dhost, 0, ETHER_ADDR_LEN);
-       }
-
-       if (eflag)
-               sll_print(sllp, length);
-
-       /*
-        * Some printers want to get back at the ethernet addresses,
-        * and/or check that they're not walking off the end of the packet.
-        * Rather than pass them all the way down, we set these globals.
-        */
-       snapend = p + caplen;

        /*
        /*

-        * Actually, the only printers that use packetp are print-arp.c
-        * and print-bootp.c, and they assume that packetp points to an
-        * Ethernet header.  The right thing to do is to fix them to know
-        * which link type is in use when they excavate. XXX
+        * Go past the cooked-mode header.

         */
         */

-       packetp = (u_char *)&ehdr;
-

        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);
+       ether_type = EXTRACT_16BITS(&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) {
                /*
                 * Yes - what type is it?
        if (ether_type <= ETHERMTU) {
                /*
                 * Yes - what type is it?


@@ -202,7 +242,7 @@ sll_if_print(u_char *user, 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:


@@ -210,37 +250,61 @@ sll_if_print(u_char *user, 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, ESRC(&ehdr),
-                           EDST(&ehdr), &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:

-                       /* 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 (!xflag && !qflag)
-                               default_print(p, caplen);
+                       /* packet type not known, print raw packet */
+                       if (!ndo->ndo_suppress_default_print)
+                               ND_DEFAULTPRINT(p, caplen);

                        break;
                }
                        break;
                }

-       } 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);
+       } else if (ether_type == ETHERTYPE_8021Q) {
+               /*
+                * Print VLAN information, and then go back and process
+                * the enclosed type field.
+                */
+               if (caplen < 4) {
+                       ND_PRINT((ndo, "[|vlan]"));
+                       return (hdrlen + caplen);
+               }
+               if (length < 4) {
+                       ND_PRINT((ndo, "[|vlan]"));
+                       return (hdrlen + length);
+               }
+               if (ndo->ndo_eflag) {
+                       uint16_t tag = EXTRACT_16BITS(p);
+
+                       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 (!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(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
+                       /* ether_type not known, print raw packet */
+                       if (!ndo->ndo_eflag)
+                               sll_print(ndo, sllp, length + SLL_HDR_LEN);
+                       if (!ndo->ndo_suppress_default_print)
+                               ND_DEFAULTPRINT(p, caplen);
+               }

        }
        }

-       if (xflag)
-               default_print(p, caplen);
- out:
-       putchar('\n');
-       --infodelay;
-       if (infoprint)
-               info(0);
+
+       return (hdrlen);

 }
 }