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#ifndef IPC_FILTER_H
#define IPC_FILTER_H
/* Declaration of the ipc filter structure. It provides a framework to
* selectively allow/disallow ipc messages a process agrees to receive. To this
* end, a single ipc filter can be specified at a given time for any recipient
* to blacklist/whitelist a set of ipc messages identified by sender or message
* type.
*/
#include <minix/ipc_filter.h>
/* IPC filter types. */
#define IPCF_NONE 0 /* no ipc filter */
#define IPCF_BLACKLIST 1 /* blacklist filter type */
#define IPCF_WHITELIST 2 /* whitelist filter type */
/* IPC filter element macros. */
EXTERN int _ipcf_nr;
#define IPCF_EL_CHECK(E) \
((((E)->flags & IPCF_MATCH_M_TYPE) || \
((E)->flags & IPCF_MATCH_M_SOURCE)) && \
(!((E)->flags & IPCF_MATCH_M_SOURCE) || \
IPCF_IS_ANY_EP((E)->m_source) || isokendpt((E)->m_source, &_ipcf_nr)))
#define IPCF_IS_USR_EP(EP) \
(!(priv(proc_addr(_ENDPOINT_P((EP))))->s_flags & SYS_PROC))
#define IPCF_IS_TSK_EP(EP) (iskerneln(_ENDPOINT_P((EP))))
#define IPCF_IS_SYS_EP(EP) (!IPCF_IS_USR_EP(EP) && !IPCF_IS_TSK_EP(EP))
#define IPCF_IS_ANY_EP(EP) \
((EP) == ANY_USR || (EP) == ANY_SYS || (EP) == ANY_TSK)
#define IPCF_EL_MATCH_M_TYPE(E,M) \
(!((E)->flags & IPCF_MATCH_M_TYPE) || (E)->m_type == (M)->m_type)
#define IPCF_EL_MATCH_M_SOURCE(E,M) \
(!((E)->flags & IPCF_MATCH_M_SOURCE) || \
(E)->m_source == (M)->m_source || \
IPCF_EL_MATCH_M_SOURCE_ANY_EP((E)->m_source,(M)->m_source))
#define IPCF_EL_MATCH_M_SOURCE_ANY_EP(ES,MS) \
(((ES) == ANY_USR && IPCF_IS_USR_EP(MS)) || \
((ES) == ANY_SYS && IPCF_IS_SYS_EP(MS)) || \
((ES) == ANY_TSK && IPCF_IS_TSK_EP(MS)))
#define IPCF_EL_MATCH(E,M) \
(IPCF_EL_MATCH_M_TYPE(E,M) && IPCF_EL_MATCH_M_SOURCE(E,M))
struct ipc_filter_s {
int type;
int num_elements;
int flags;
struct ipc_filter_s *next;
ipc_filter_el_t elements[IPCF_MAX_ELEMENTS];
};
typedef struct ipc_filter_s ipc_filter_t;
/* IPC filter pool. */
#define IPCF_POOL_SIZE (2*NR_SYS_PROCS)
EXTERN ipc_filter_t ipc_filter_pool[IPCF_POOL_SIZE];
/* IPC filter pool macros. */
#define IPCF_POOL_FREE_SLOT(S) ((S)->type = IPCF_NONE)
#define IPCF_POOL_IS_FREE_SLOT(S) ((S)->type == IPCF_NONE)
#define IPCF_POOL_ALLOCATE_SLOT(T,S) \
do { \
int i; \
*(S) = NULL; \
for (i = 0; i < IPCF_POOL_SIZE; i++) { \
if (IPCF_POOL_IS_FREE_SLOT(&ipc_filter_pool[i])) { \
*(S) = &ipc_filter_pool[i]; \
(*(S))->type = T; \
break; \
} \
} \
} while(0)
#define IPCF_POOL_INIT(S) memset(&ipc_filter_pool,0,sizeof(ipc_filter_pool))
#endif /* !IPC_FILTER_H */
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