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netfilter: fix string extension for case insensitive pattern matching

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The flag XT_STRING_FLAG_IGNORECASE indicates case insensitive string
matching. netfilter can find cmd.exe, Cmd.exe, cMd.exe and etc easily.

A new revision 1 was added, in the meantime invert of xt_string_info
was moved into flags as a flag. If revision is 1, The flag
XT_STRING_FLAG_INVERT indicates invert matching.

Signed-off-by: Joonwoo Park <joonwpark81@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joonwoo Park
2008-07-08 02:38:56 -07:00
committed by David S. Miller
parent dde77e6044
commit 4ad3f26162
2 changed files with 50 additions and 3 deletions
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15
include/linux/netfilter/xt_string.h
View File

@@ -4,6 +4,11 @@
#define XT_STRING_MAX_PATTERN_SIZE 128
#define XT_STRING_MAX_ALGO_NAME_SIZE 16
enum {
XT_STRING_FLAG_INVERT = 0x01,
XT_STRING_FLAG_IGNORECASE = 0x02
};
struct xt_string_info
{
u_int16_t from_offset;
@@ -11,7 +16,15 @@ struct xt_string_info
char algo[XT_STRING_MAX_ALGO_NAME_SIZE];
char pattern[XT_STRING_MAX_PATTERN_SIZE];
u_int8_t patlen;
u_int8_t invert;
union {
struct {
u_int8_t invert;
} v0;
struct {
u_int8_t flags;
} v1;
} u;
/* Used internally by the kernel */
struct ts_config __attribute__((aligned(8))) *config;