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