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Commit 3fc7e8a6 authored by Thomas Graf's avatar Thomas Graf Committed by David S. Miller
Browse files

[NET]: skb_find_text() - Find a text pattern in skb data 



Finds a pattern in the skb data according to the specified
textsearch configuration. Use textsearch_next() to retrieve
subsequent occurrences of the pattern. Returns the offset
to the first occurrence or UINT_MAX if no match was found.

Signed-off-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 677e90ed

include/linux/skbuff.h

+5 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <linux/highmem.h>

#include <linux/poll.h>

#include <linux/net.h>

#include <linux/textsearch.h>

#include <net/checksum.h>



#define HAVE_ALLOC_SKB		/* For the drivers to know */
@@ -339,6 +340,10 @@ extern unsigned int skb_seq_read(unsigned int consumed, const u8 **data, 
				   struct skb_seq_state *st);

extern void	      skb_abort_seq_read(struct skb_seq_state *st);



extern unsigned int   skb_find_text(struct sk_buff *skb, unsigned int from,

				    unsigned int to, struct ts_config *config,

				    struct ts_state *state);



/* Internal */

#define skb_shinfo(SKB)		((struct skb_shared_info *)((SKB)->end))

net/core/skbuff.c

+40 −0
Original line number Diff line number Diff line
@@ -1614,6 +1614,45 @@ void skb_abort_seq_read(struct skb_seq_state *st) 
		kunmap_skb_frag(st->frag_data);

}



#define TS_SKB_CB(state)	((struct skb_seq_state *) &((state)->cb))



static unsigned int skb_ts_get_next_block(unsigned int offset, const u8 **text,

					  struct ts_config *conf,

					  struct ts_state *state)

{

	return skb_seq_read(offset, text, TS_SKB_CB(state));

}



static void skb_ts_finish(struct ts_config *conf, struct ts_state *state)

{

	skb_abort_seq_read(TS_SKB_CB(state));

}



/**

 * skb_find_text - Find a text pattern in skb data

 * @skb: the buffer to look in

 * @from: search offset

 * @to: search limit

 * @config: textsearch configuration

 * @state: uninitialized textsearch state variable

 *

 * Finds a pattern in the skb data according to the specified

 * textsearch configuration. Use textsearch_next() to retrieve

 * subsequent occurrences of the pattern. Returns the offset

 * to the first occurrence or UINT_MAX if no match was found.

 */

unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,

			   unsigned int to, struct ts_config *config,

			   struct ts_state *state)

{

	config->get_next_block = skb_ts_get_next_block;

	config->finish = skb_ts_finish;



	skb_prepare_seq_read(skb, from, to, TS_SKB_CB(state));



	return textsearch_find(config, state);

}



void __init skb_init(void)

{

	skbuff_head_cache = kmem_cache_create("skbuff_head_cache",
@@ -1655,3 +1694,4 @@ EXPORT_SYMBOL(skb_split); 
EXPORT_SYMBOL(skb_prepare_seq_read);

EXPORT_SYMBOL(skb_seq_read);

EXPORT_SYMBOL(skb_abort_seq_read);

EXPORT_SYMBOL(skb_find_text);