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-rw-r--r--print-usb.c284
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diff --git a/print-usb.c b/print-usb.c
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+/*
+ * Copyright 2009 Bert Vermeulen <bert@biot.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by Paolo Abeni.''
+ * The name of author may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Support for USB packets
+ *
+ */
+
+/* \summary: USB printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+
+#ifdef DLT_USB_LINUX
+/*
+ * possible transfer mode
+ */
+#define URB_TRANSFER_IN 0x80
+#define URB_ISOCHRONOUS 0x0
+#define URB_INTERRUPT 0x1
+#define URB_CONTROL 0x2
+#define URB_BULK 0x3
+
+/*
+ * possible event type
+ */
+#define URB_SUBMIT 'S'
+#define URB_COMPLETE 'C'
+#define URB_ERROR 'E'
+
+/*
+ * USB setup header as defined in USB specification.
+ * Appears at the front of each Control S-type packet in DLT_USB captures.
+ */
+typedef struct _usb_setup {
+ nd_uint8_t bmRequestType;
+ nd_uint8_t bRequest;
+ nd_uint16_t wValue;
+ nd_uint16_t wIndex;
+ nd_uint16_t wLength;
+} pcap_usb_setup;
+
+/*
+ * Information from the URB for Isochronous transfers.
+ */
+typedef struct _iso_rec {
+ nd_int32_t error_count;
+ nd_int32_t numdesc;
+} iso_rec;
+
+/*
+ * Header prepended by linux kernel to each event.
+ * Appears at the front of each packet in DLT_USB_LINUX captures.
+ */
+typedef struct _usb_header {
+ nd_uint64_t id;
+ nd_uint8_t event_type;
+ nd_uint8_t transfer_type;
+ nd_uint8_t endpoint_number;
+ nd_uint8_t device_address;
+ nd_uint16_t bus_id;
+ nd_uint8_t setup_flag;/*if !=0 the urb setup header is not present*/
+ nd_uint8_t data_flag; /*if !=0 no urb data is present*/
+ nd_int64_t ts_sec;
+ nd_int32_t ts_usec;
+ nd_int32_t status;
+ nd_uint32_t urb_len;
+ nd_uint32_t data_len; /* amount of urb data really present in this event*/
+ pcap_usb_setup setup;
+} pcap_usb_header;
+
+/*
+ * Header prepended by linux kernel to each event for the 2.6.31
+ * and later kernels; for the 2.6.21 through 2.6.30 kernels, the
+ * "iso_rec" information, and the fields starting with "interval"
+ * are zeroed-out padding fields.
+ *
+ * Appears at the front of each packet in DLT_USB_LINUX_MMAPPED captures.
+ */
+typedef struct _usb_header_mmapped {
+ nd_uint64_t id;
+ nd_uint8_t event_type;
+ nd_uint8_t transfer_type;
+ nd_uint8_t endpoint_number;
+ nd_uint8_t device_address;
+ nd_uint16_t bus_id;
+ nd_uint8_t setup_flag;/*if !=0 the urb setup header is not present*/
+ nd_uint8_t data_flag; /*if !=0 no urb data is present*/
+ nd_int64_t ts_sec;
+ nd_int32_t ts_usec;
+ nd_int32_t status;
+ nd_uint32_t urb_len;
+ nd_uint32_t data_len; /* amount of urb data really present in this event*/
+ union {
+ pcap_usb_setup setup;
+ iso_rec iso;
+ } s;
+ nd_int32_t interval; /* for Interrupt and Isochronous events */
+ nd_int32_t start_frame; /* for Isochronous events */
+ nd_uint32_t xfer_flags; /* copy of URB's transfer flags */
+ nd_uint32_t ndesc; /* number of isochronous descriptors */
+} pcap_usb_header_mmapped;
+
+/*
+ * Isochronous descriptors; for isochronous transfers there might be
+ * one or more of these at the beginning of the packet data. The
+ * number of descriptors is given by the "ndesc" field in the header;
+ * as indicated, in older kernels that don't put the descriptors at
+ * the beginning of the packet, that field is zeroed out, so that field
+ * can be trusted even in captures from older kernels.
+ */
+typedef struct _usb_isodesc {
+ nd_int32_t status;
+ nd_uint32_t offset;
+ nd_uint32_t len;
+ nd_byte pad[4];
+} usb_isodesc;
+
+
+/* returns direction: 1=inbound 2=outbound -1=invalid */
+static int
+get_direction(int transfer_type, int event_type)
+{
+ int direction;
+
+ direction = -1;
+ switch(transfer_type){
+ case URB_BULK:
+ case URB_CONTROL:
+ case URB_ISOCHRONOUS:
+ switch(event_type)
+ {
+ case URB_SUBMIT:
+ direction = 2;
+ break;
+ case URB_COMPLETE:
+ case URB_ERROR:
+ direction = 1;
+ break;
+ default:
+ direction = -1;
+ }
+ break;
+ case URB_INTERRUPT:
+ switch(event_type)
+ {
+ case URB_SUBMIT:
+ direction = 1;
+ break;
+ case URB_COMPLETE:
+ case URB_ERROR:
+ direction = 2;
+ break;
+ default:
+ direction = -1;
+ }
+ break;
+ default:
+ direction = -1;
+ }
+
+ return direction;
+}
+
+static void
+usb_header_print(netdissect_options *ndo, const pcap_usb_header *uh)
+{
+ int direction;
+ uint8_t transfer_type, event_type;
+
+ ndo->ndo_protocol = "usb";
+
+ nd_print_protocol_caps(ndo);
+ if (ndo->ndo_qflag)
+ return;
+
+ ND_PRINT(" ");
+ transfer_type = GET_U_1(uh->transfer_type);
+ switch(transfer_type)
+ {
+ case URB_ISOCHRONOUS:
+ ND_PRINT("ISOCHRONOUS");
+ break;
+ case URB_INTERRUPT:
+ ND_PRINT("INTERRUPT");
+ break;
+ case URB_CONTROL:
+ ND_PRINT("CONTROL");
+ break;
+ case URB_BULK:
+ ND_PRINT("BULK");
+ break;
+ default:
+ ND_PRINT(" ?");
+ }
+
+ event_type = GET_U_1(uh->event_type);
+ switch(event_type)
+ {
+ case URB_SUBMIT:
+ ND_PRINT(" SUBMIT");
+ break;
+ case URB_COMPLETE:
+ ND_PRINT(" COMPLETE");
+ break;
+ case URB_ERROR:
+ ND_PRINT(" ERROR");
+ break;
+ default:
+ ND_PRINT(" ?");
+ }
+
+ direction = get_direction(transfer_type, event_type);
+ if(direction == 1)
+ ND_PRINT(" from");
+ else if(direction == 2)
+ ND_PRINT(" to");
+ ND_PRINT(" %u:%u:%u", GET_HE_U_2(uh->bus_id),
+ GET_U_1(uh->device_address),
+ GET_U_1(uh->endpoint_number) & 0x7f);
+}
+
+/*
+ * This is the top level routine of the printer for captures with a
+ * 48-byte header.
+ *
+ * 'p' points to the 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
+usb_linux_48_byte_if_print(netdissect_options *ndo,
+ const struct pcap_pkthdr *h _U_, const u_char *p)
+{
+ ndo->ndo_protocol = "usb_linux_48_byte";
+ ND_TCHECK_LEN(p, sizeof(pcap_usb_header));
+ ndo->ndo_ll_hdr_len += sizeof (pcap_usb_header);
+
+ usb_header_print(ndo, (const pcap_usb_header *) p);
+}
+
+#ifdef DLT_USB_LINUX_MMAPPED
+/*
+ * This is the top level routine of the printer for captures with a
+ * 64-byte header.
+ *
+ * 'p' points to the 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
+usb_linux_64_byte_if_print(netdissect_options *ndo,
+ const struct pcap_pkthdr *h _U_, const u_char *p)
+{
+ ndo->ndo_protocol = "usb_linux_64_byte";
+ ND_TCHECK_LEN(p, sizeof(pcap_usb_header_mmapped));
+ ndo->ndo_ll_hdr_len += sizeof (pcap_usb_header_mmapped);
+
+ usb_header_print(ndo, (const pcap_usb_header *) p);
+}
+#endif /* DLT_USB_LINUX_MMAPPED */
+
+#endif /* DLT_USB_LINUX */
+
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