xt_sctp.h

Go to the documentation of this file.

#ifndef _XT_SCTP_H_
#define _XT_SCTP_H_

#include <linux/types.h>

#define XT_SCTP_SRC_PORTS           0x01
#define XT_SCTP_DEST_PORTS          0x02
#define XT_SCTP_CHUNK_TYPES     0x04

#define XT_SCTP_VALID_FLAGS     0x07

struct xt_sctp_flag_info {
    __u8 chunktype;
    __u8 flag;
    __u8 flag_mask;
};

#define XT_NUM_SCTP_FLAGS   4

struct xt_sctp_info {
    __u16 dpts[2];  /* Min, Max */
    __u16 spts[2];  /* Min, Max */

    __u32 chunkmap[256 / sizeof (__u32)];  /* Bit mask of chunks to be matched according to RFC 2960 */

#define SCTP_CHUNK_MATCH_ANY   0x01  /* Match if any of the chunk types are present */
#define SCTP_CHUNK_MATCH_ALL   0x02  /* Match if all of the chunk types are present */
#define SCTP_CHUNK_MATCH_ONLY  0x04  /* Match if these are the only chunk types present */

    __u32 chunk_match_type;
    struct xt_sctp_flag_info flag_info[XT_NUM_SCTP_FLAGS];
    int flag_count;

    __u32 flags;
    __u32 invflags;
};

#define bytes(type) (sizeof(type) * 8)

#define SCTP_CHUNKMAP_SET(chunkmap, type)       \
    do {                        \
        (chunkmap)[type / bytes(__u32)] |=  \
            1 << (type % bytes(__u32)); \
    } while (0)

#define SCTP_CHUNKMAP_CLEAR(chunkmap, type)         \
    do {                            \
        (chunkmap)[type / bytes(__u32)] &=      \
            ~(1 << (type % bytes(__u32)));  \
    } while (0)

#define SCTP_CHUNKMAP_IS_SET(chunkmap, type)            \
({                              \
    ((chunkmap)[type / bytes (__u32)] &         \
        (1 << (type % bytes (__u32)))) ? 1: 0;  \
})

#define SCTP_CHUNKMAP_RESET(chunkmap) \
    memset((chunkmap), 0, sizeof(chunkmap))

#define SCTP_CHUNKMAP_SET_ALL(chunkmap) \
    memset((chunkmap), ~0U, sizeof(chunkmap))

#define SCTP_CHUNKMAP_COPY(destmap, srcmap) \
    memcpy((destmap), (srcmap), sizeof(srcmap))

#define SCTP_CHUNKMAP_IS_CLEAR(chunkmap) \
    __sctp_chunkmap_is_clear((chunkmap), ARRAY_SIZE(chunkmap))
static inline bool
__sctp_chunkmap_is_clear(const __u32 *chunkmap, unsigned int n)
{
    unsigned int i;
    for (i = 0; i < n; ++i)
        if (chunkmap[i])
            return false;
    return true;
}

#define SCTP_CHUNKMAP_IS_ALL_SET(chunkmap) \
    __sctp_chunkmap_is_all_set((chunkmap), ARRAY_SIZE(chunkmap))
static inline bool
__sctp_chunkmap_is_all_set(const __u32 *chunkmap, unsigned int n)
{
    unsigned int i;
    for (i = 0; i < n; ++i)
        if (chunkmap[i] != ~0U)
            return false;
    return true;
}

#endif /* _XT_SCTP_H_ */