/* \summary: Linux cooked sockets capture printer */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
+
+#ifdef __linux__
+#include <net/if.h>
#endif
-#include <netdissect-stdinc.h>
+#include "netdissect-stdinc.h"
+#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "addrtoname.h"
#include "ethertype.h"
#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 */
+ 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 */
};
/*
{ 0, NULL}
};
-static inline void
+static void
sll_print(netdissect_options *ndo, const struct sll_header *sllp, u_int length)
{
u_short ether_type;
- ND_PRINT((ndo, "%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_BE_U_2(&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_BE_U_2(&sllp->sll_halen) == 6)
- ND_PRINT((ndo, "%s ", etheraddr_string(ndo, sllp->sll_addr)));
+ if (GET_BE_U_2(sllp->sll_halen) == MAC48_LEN)
+ ND_PRINT("%s ", GET_MAC48_STRING(sllp->sll_addr));
if (!ndo->ndo_qflag) {
- ether_type = EXTRACT_BE_U_2(&sllp->sll_protocol);
+ ether_type = GET_BE_U_2(sllp->sll_protocol);
if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
/*
/*
* Ethernet_802.3 IPX frame.
*/
- ND_PRINT((ndo, "802.3"));
+ ND_PRINT("802.3");
break;
case LINUX_SLL_P_802_2:
/*
* 802.2.
*/
- ND_PRINT((ndo, "802.2"));
+ ND_PRINT("802.2");
break;
default:
/*
* What is it?
*/
- ND_PRINT((ndo, "ethertype Unknown (0x%04x)",
- ether_type));
+ ND_PRINT("ethertype Unknown (0x%04x)",
+ ether_type);
break;
}
} else {
- ND_PRINT((ndo, "ethertype %s (0x%04x)",
+ ND_PRINT("ethertype %s (0x%04x)",
tok2str(ethertype_values, "Unknown", ether_type),
- ether_type));
+ ether_type);
}
- ND_PRINT((ndo, ", 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
+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;
const struct sll_header *sllp;
+ u_short hatype;
u_short ether_type;
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.
- */
- ND_PRINT((ndo, "[|sll]"));
- return (caplen);
- }
+ ndo->ndo_protocol = "sll";
+ ND_TCHECK_LEN(p, SLL_HDR_LEN);
sllp = (const struct sll_header *)p;
p += SLL_HDR_LEN;
hdrlen = SLL_HDR_LEN;
- ether_type = EXTRACT_BE_U_2(&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:
/*
* the enclosed type field.
*/
if (caplen < 4) {
- ND_PRINT((ndo, "[|vlan]"));
- return (hdrlen + caplen);
- }
- if (length < 4) {
- ND_PRINT((ndo, "[|vlan]"));
- return (hdrlen + length);
+ ndo->ndo_protocol = "vlan";
+ nd_print_trunc(ndo);
+ ndo->ndo_ll_hdr_len += hdrlen + caplen;
+ return;
}
if (ndo->ndo_eflag) {
- uint16_t tag = EXTRACT_BE_U_2(p);
+ uint16_t tag = GET_BE_U_2(p);
- ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
+ ND_PRINT("%s, ", ieee8021q_tci_string(tag));
}
- ether_type = EXTRACT_BE_U_2(p + 2);
+ 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((ndo, "ethertype %s, ",
- tok2str(ethertype_values, "Unknown", ether_type)));
+ ND_PRINT("ethertype %s, ",
+ tok2str(ethertype_values, "Unknown", ether_type));
}
p += 4;
length -= 4;
}
}
- return (hdrlen);
+ 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;
+ }
+ } 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) {
+ 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);
+ }
+ }
+
+ ndo->ndo_ll_hdr_len += hdrlen;
}
projects / tcpdump / blobdiff