[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: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -27,6 +27,7 @@
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#include <linux/highmem.h>
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#include <linux/poll.h>
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#include <linux/net.h>
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#include <linux/textsearch.h>
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#include <net/checksum.h>
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#define HAVE_ALLOC_SKB /* For the drivers to know */
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@ -339,6 +340,10 @@ extern unsigned int skb_seq_read(unsigned int consumed, const u8 **data,
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struct skb_seq_state *st);
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extern void skb_abort_seq_read(struct skb_seq_state *st);
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extern unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,
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unsigned int to, struct ts_config *config,
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struct ts_state *state);
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/* Internal */
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#define skb_shinfo(SKB) ((struct skb_shared_info *)((SKB)->end))
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@ -1614,6 +1614,45 @@ void skb_abort_seq_read(struct skb_seq_state *st)
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kunmap_skb_frag(st->frag_data);
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}
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#define TS_SKB_CB(state) ((struct skb_seq_state *) &((state)->cb))
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static unsigned int skb_ts_get_next_block(unsigned int offset, const u8 **text,
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struct ts_config *conf,
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struct ts_state *state)
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{
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return skb_seq_read(offset, text, TS_SKB_CB(state));
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}
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static void skb_ts_finish(struct ts_config *conf, struct ts_state *state)
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{
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skb_abort_seq_read(TS_SKB_CB(state));
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}
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/**
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* skb_find_text - Find a text pattern in skb data
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* @skb: the buffer to look in
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* @from: search offset
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* @to: search limit
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* @config: textsearch configuration
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* @state: uninitialized textsearch state variable
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*
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* Finds a pattern in the skb data according to the specified
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* textsearch configuration. Use textsearch_next() to retrieve
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* subsequent occurrences of the pattern. Returns the offset
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* to the first occurrence or UINT_MAX if no match was found.
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*/
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unsigned int skb_find_text(struct sk_buff *skb, unsigned int from,
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unsigned int to, struct ts_config *config,
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struct ts_state *state)
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{
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config->get_next_block = skb_ts_get_next_block;
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config->finish = skb_ts_finish;
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skb_prepare_seq_read(skb, from, to, TS_SKB_CB(state));
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return textsearch_find(config, state);
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}
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void __init skb_init(void)
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{
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skbuff_head_cache = kmem_cache_create("skbuff_head_cache",
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@ -1655,3 +1694,4 @@ EXPORT_SYMBOL(skb_split);
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EXPORT_SYMBOL(skb_prepare_seq_read);
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EXPORT_SYMBOL(skb_seq_read);
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EXPORT_SYMBOL(skb_abort_seq_read);
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EXPORT_SYMBOL(skb_find_text);
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