Adds a USB packet filter feature to the stack that it could capture

packets which go through each USB host controllers.  Its implementations
are almost based on BPF code and very similar with it except it's
little bit customized for USB packet only.  The userland program
usbdump(8) would be committed soon.

Discussed with:	hps, thompsa, yongari

1 files changed, 32 insertions, 0 deletions

diff --git a/sys/dev/usb/controller/usb_controller.c b/sys/dev/usb/controller/usb_controller.c
index 71e7ef1..afc2118 100644
--- a/sys/dev/usb/controller/usb_controller.c
+++ b/sys/dev/usb/controller/usb_controller.c
@@ -61,6 +61,7 @@
 
 #include <dev/usb/usb_controller.h>
 #include <dev/usb/usb_bus.h>
+#include <dev/usb/usb_pf.h>
 
 /* function prototypes  */
 
@@ -547,6 +548,8 @@ usb_bus_mem_alloc_all(struct usb_bus *bus, bus_dma_tag_t dmat,
 
 	TAILQ_INIT(&bus->intr_q.head);
 
+	usbpf_attach(bus, &bus->uif);
+
 #if USB_HAVE_BUSDMA
 	usb_dma_tag_setup(bus->dma_parent_tag, bus->dma_tags,
 	    dmat, &bus->bus_mtx, NULL, 32, USB_BUS_DMA_TAG_MAX);
@@ -594,5 +597,34 @@ usb_bus_mem_free_all(struct usb_bus *bus, usb_bus_mem_cb_t *cb)
 	usb_dma_tag_unsetup(bus->dma_parent_tag);
 #endif
 
+	usbpf_detach(bus);
+
 	mtx_destroy(&bus->bus_mtx);
 }
+
+struct usb_bus *
+usb_bus_find(const char *name)
+{
+	struct usb_bus *ubus;
+	devclass_t dc;
+	device_t *devlist;
+	int devcount, error, i;
+	const char *nameunit;
+
+	dc = devclass_find("usbus");
+	if (dc == NULL)
+		return (NULL);
+	error = devclass_get_devices(dc, &devlist, &devcount);
+	if (error != 0)
+		return (NULL);
+	for (i = 0; i < devcount; i++) {
+		nameunit = device_get_nameunit(devlist[i]);
+		if (!strncmp(name, nameunit, strlen(nameunit))) {
+			ubus = device_get_ivars(devlist[i]);
+			free(devlist, M_TEMP);
+			return (ubus);
+		}
+	}
+	free(devlist, M_TEMP);
+	return (NULL);
+}