[NET]: skb_find_text() - Find a text pattern in skb data (3fc7e8a6) · Commits · 戴 / test

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);

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