6f23ee1fef
This patch adds a new, "binary" API in addition to the old, text API usbmon had before. The new API allows for less CPU use, and it allows to capture all data from a packet where old API only captured 32 bytes at most. There are some limitations and conditions to this, e.g. in case someone constructs a URB with 1GB of data, it's not likely to be captured, because even the huge buffers of the new reader are finite. Nonetheless, I expect this new capability to capture all data for all real life scenarios. The downside is, a special user mode application is required where cat(1) worked before. I have sample code at http://people.redhat.com/zaitcev/linux/ and Paolo Abeni is working on patching libpcap. This patch was initially written by Paolo and later I tweaked it, and we had a little back-and-forth. So this is a jointly authored patch, but I am submitting this I am responsible for the bugs. Signed-off-by: Paolo Abeni <paolo.abeni@email.it> Signed-off-by: Pete Zaitcev <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
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* The USB Monitor, inspired by Dave Harding's USBMon.
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*
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* Copyright (C) 2005 Pete Zaitcev (zaitcev@redhat.com)
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*/
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#ifndef __USB_MON_H
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#define __USB_MON_H
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/kref.h>
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/* #include <linux/usb.h> */ /* We use struct pointers only in this header */
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#define TAG "usbmon"
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struct mon_bus {
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struct list_head bus_link;
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spinlock_t lock;
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struct usb_bus *u_bus;
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int text_inited;
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struct dentry *dent_s; /* Debugging file */
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struct dentry *dent_t; /* Text interface file */
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int uses_dma;
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/* Ref */
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int nreaders; /* Under mon_lock AND mbus->lock */
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struct list_head r_list; /* Chain of readers (usually one) */
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struct kref ref; /* Under mon_lock */
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/* Stats */
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unsigned int cnt_events;
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unsigned int cnt_text_lost;
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};
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/*
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* An instance of a process which opened a file (but can fork later)
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*/
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struct mon_reader {
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struct list_head r_link;
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struct mon_bus *m_bus;
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void *r_data; /* Use container_of instead? */
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void (*rnf_submit)(void *data, struct urb *urb);
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void (*rnf_error)(void *data, struct urb *urb, int error);
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void (*rnf_complete)(void *data, struct urb *urb);
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};
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void mon_reader_add(struct mon_bus *mbus, struct mon_reader *r);
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void mon_reader_del(struct mon_bus *mbus, struct mon_reader *r);
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struct mon_bus *mon_bus_lookup(unsigned int num);
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int /*bool*/ mon_text_add(struct mon_bus *mbus, const struct usb_bus *ubus);
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void mon_text_del(struct mon_bus *mbus);
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// void mon_bin_add(struct mon_bus *);
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int __init mon_text_init(void);
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void __exit mon_text_exit(void);
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int __init mon_bin_init(void);
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void __exit mon_bin_exit(void);
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/*
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* DMA interface.
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*
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* XXX The vectored side needs a serious re-thinking. Abstracting vectors,
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* like in Paolo's original patch, produces a double pkmap. We need an idea.
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*/
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extern char mon_dmapeek(unsigned char *dst, dma_addr_t dma_addr, int len);
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struct mon_reader_bin;
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extern void mon_dmapeek_vec(const struct mon_reader_bin *rp,
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unsigned int offset, dma_addr_t dma_addr, unsigned int len);
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extern unsigned int mon_copy_to_buff(const struct mon_reader_bin *rp,
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unsigned int offset, const unsigned char *from, unsigned int len);
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/*
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*/
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extern struct mutex mon_lock;
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extern const struct file_operations mon_fops_stat;
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#endif /* __USB_MON_H */
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