usr/src/uts/common/sys/door.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 /*
  27  * The door lightweight RPC I/F.
  28  */
  29
  30 #ifndef _SYS_DOOR_H
  31 #define _SYS_DOOR_H
  32
  33 #ifdef  __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 /*
  38  * Attributes associated with doors.
  39  */
  40
  41 /* Attributes originally obtained from door_create operation */
  42 #define DOOR_UNREF      0x01    /* Deliver an unref notification with door */
  43 #define DOOR_PRIVATE    0x02    /* Use a private pool of server threads */
  44 #define DOOR_UNREF_MULTI 0x10   /* Deliver unref notification more than once */
  45 #define DOOR_REFUSE_DESC 0x40   /* Do not accept descriptors from callers */
  46 #define DOOR_NO_CANCEL  0x80    /* No server thread cancel on client abort */
  47 #define DOOR_NO_DEPLETION_CB 0x100 /* No thread create callbacks on depletion */
  48
  49 /* Attributes (additional) returned with door_info and door_desc_t data */
  50 #define DOOR_LOCAL      0x04    /* Descriptor is local to current process */
  51 #define DOOR_REVOKED    0x08    /* Door has been revoked */
  52 #define DOOR_IS_UNREF   0x20    /* Door is currently unreferenced */
  53 #define DOOR_PRIVCREATE 0x200   /* Door has a private thread creation func */
  54 #define DOOR_DEPLETION_CB 0x400 /* Set only during depletion callbacks */
  55
  56 #if !defined(_ASM)
  57
  58 #include <sys/types.h>
  59
  60 #if defined(_KERNEL)
  61 #include <sys/mutex.h>
  62 #include <sys/vnode.h>
  63 #include <sys/door_impl.h>
  64 #endif /* defined(_KERNEL) */
  65
  66 /* Basic door type information */
  67 typedef unsigned long long door_ptr_t;  /* Handle 64 bit pointers */
  68 typedef unsigned long long door_id_t;   /* Unique door identifier */
  69 typedef unsigned int       door_attr_t; /* Door attributes */
  70
  71 #ifdef _KERNEL
  72 struct __door_handle;
  73 typedef struct __door_handle *door_handle_t;    /* opaque kernel door handle */
  74 #endif
  75
  76 #define DOOR_INVAL -1                   /* An invalid door descriptor */
  77 #define DOOR_UNREF_DATA ((void *)1)     /* Unreferenced invocation address */
  78
  79 /* Door descriptor passed to door_info to get current thread's binding */
  80 #define DOOR_QUERY -2
  81
  82 /* Masks of applicable flags */
  83 #define DOOR_CREATE_MASK        (DOOR_UNREF | DOOR_PRIVATE | \
  84             DOOR_UNREF_MULTI | DOOR_REFUSE_DESC | DOOR_NO_CANCEL | \
  85             DOOR_NO_DEPLETION_CB | DOOR_PRIVCREATE)
  86 #define DOOR_KI_CREATE_MASK     (DOOR_UNREF | DOOR_UNREF_MULTI)
  87
  88 /* Mask of above attributes */
  89 #define DOOR_ATTR_MASK  (DOOR_CREATE_MASK | \
  90             DOOR_LOCAL | DOOR_REVOKED | DOOR_IS_UNREF)
  91
  92 /* Attributes used to describe door_desc_t data */
  93 #define DOOR_DESCRIPTOR 0x10000 /* A file descriptor is being passed */
  94 #ifdef _KERNEL
  95 #define DOOR_HANDLE     0x20000 /* A kernel door handle is being passed */
  96 #endif
  97 #define DOOR_RELEASE    0x40000 /* Passed references are also released */
  98
  99 /* Misc attributes used internally */
 100 #define DOOR_DELAY      0x80000 /* Delayed unref delivery */
 101 #define DOOR_UNREF_ACTIVE 0x100000      /* Unreferenced call is active */
 102
 103 /* door parameters */
 104 #define DOOR_PARAM_DESC_MAX     1       /* max number of request descriptors */
 105 #define DOOR_PARAM_DATA_MAX     2       /* max bytes of request data */
 106 #define DOOR_PARAM_DATA_MIN     3       /* min bytes of request data */
 107
 108 /*
 109  * On AMD64, 32-bit pack door_desc and door_info to avoid needing special
 110  * copyin/copyout conversions due to differing alignment rules between
 111  * 32-bit x86 and 64-bit amd64.
 112  */
 113
 114 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
 115 #pragma pack(4)
 116 #endif
 117
 118 /*
 119  * Structure used to pass descriptors/objects in door invocations
 120  */
 121
 122 typedef struct door_desc {
 123         door_attr_t     d_attributes;   /* Tag for union */
 124         union {
 125                 /* File descriptor is passed */
 126                 struct {
 127                         int             d_descriptor;
 128                         door_id_t       d_id;           /* unique id */
 129                 } d_desc;
 130 #ifdef _KERNEL
 131                 /* Kernel passes handles referring to doors */
 132                 door_handle_t d_handle;
 133 #endif
 134                 /* Reserved space */
 135                 int             d_resv[5];
 136         } d_data;
 137 } door_desc_t;
 138
 139 /*
 140  * Structure used to return info from door_info
 141  */
 142 typedef struct door_info {
 143         pid_t           di_target;      /* Server process */
 144         door_ptr_t      di_proc;        /* Server procedure */
 145         door_ptr_t      di_data;        /* Data cookie */
 146         door_attr_t     di_attributes;  /* Attributes associated with door */
 147         door_id_t       di_uniquifier;  /* Unique number */
 148         int             di_resv[4];     /* Future use */
 149 } door_info_t;
 150
 151 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
 152 #pragma pack()
 153 #endif
 154
 155 /*
 156  * Structure used to return info from door_cred
 157  */
 158 typedef struct door_cred {
 159         uid_t   dc_euid;        /* Effective uid of client */
 160         gid_t   dc_egid;        /* Effective gid of client */
 161         uid_t   dc_ruid;        /* Real uid of client */
 162         gid_t   dc_rgid;        /* Real gid of client */
 163         pid_t   dc_pid;         /* pid of client */
 164         int     dc_resv[4];     /* Future use */
 165 } door_cred_t;
 166
 167 /*
 168  * Structure used to pass/return data from door_call
 169  *
 170  * All fields are in/out paramters. Upon return these fields
 171  * are updated to reflect the true location and size of the results.
 172  */
 173 typedef struct door_arg {
 174         char            *data_ptr;      /* Argument/result data */
 175         size_t          data_size;      /* Argument/result data size */
 176         door_desc_t     *desc_ptr;      /* Argument/result descriptors */
 177         uint_t          desc_num;       /* Argument/result num discriptors */
 178         char            *rbuf;          /* Result area */
 179         size_t          rsize;          /* Result size */
 180 } door_arg_t;
 181
 182 #if defined(_SYSCALL32)
 183 /*
 184  * Structure to pass/return data from 32-bit program's door_call.
 185  */
 186 typedef struct door_arg32 {
 187         caddr32_t       data_ptr;       /* Argument/result data */
 188         size32_t        data_size;      /* Argument/result data size */
 189         caddr32_t       desc_ptr;       /* Argument/result descriptors */
 190         uint32_t        desc_num;       /* Argument/result num descriptors */
 191         caddr32_t       rbuf;           /* Result area */
 192         size32_t        rsize;          /* Result size */
 193 } door_arg32_t;
 194 #endif
 195
 196 /*
 197  * Structure used to pass door invocation information.
 198  */
 199 struct door_results {
 200         void            *cookie;
 201         char            *data_ptr;
 202         size_t          data_size;
 203         door_desc_t     *desc_ptr;
 204         size_t          desc_num;
 205         void            (*pc)();
 206         int             nservers;       /* zero if thread pool is empty */
 207         door_info_t     *door_info;
 208 };
 209
 210 #if defined(_SYSCALL32)
 211 /*
 212  * Structure used to pass door invocation information to 32-bit processes.
 213  */
 214 struct door_results32 {
 215         caddr32_t       cookie;
 216         caddr32_t       data_ptr;
 217         size32_t        data_size;
 218         caddr32_t       desc_ptr;
 219         size32_t        desc_num;
 220         caddr32_t       pc;
 221         int             nservers;
 222         caddr32_t       door_info;
 223 };
 224 #endif
 225
 226 /*
 227  * Structure used to pass a descriptor list to door_return.
 228  */
 229 typedef struct door_return_desc {
 230         door_desc_t     *desc_ptr;
 231         uint_t          desc_num;
 232 } door_return_desc_t;
 233
 234 #if defined(_SYSCALL32)
 235 typedef struct door_return_desc32 {
 236         caddr32_t       desc_ptr;
 237         uint_t          desc_num;
 238 } door_return_desc32_t;
 239 #endif
 240
 241 #if defined(_KERNEL)
 242
 243 /*
 244  * Errors used for doors. Negative numbers to avoid conflicts with errnos
 245  */
 246 #define DOOR_WAIT       -1      /* Waiting for response */
 247 #define DOOR_EXIT       -2      /* Server thread has exited */
 248
 249 #define VTOD(v) ((struct door_node *)(v->v_data))
 250 #define DTOV(d) ((d)->door_vnode)
 251
 252 /*
 253  * Underlying 'filesystem' object definition
 254  */
 255 typedef struct door_node {
 256         vnode_t         *door_vnode;
 257         struct proc     *door_target;   /* Proc handling this doors invoc's. */
 258         struct door_node *door_list;    /* List of active doors in proc */
 259         struct door_node *door_ulist;   /* Unref list */
 260         void            (*door_pc)();   /* Door server entry point */
 261         void            *door_data;     /* Cookie passed during invocations */
 262         door_id_t       door_index;     /* Used as a uniquifier */
 263         door_attr_t     door_flags;     /* State associated with door */
 264         uint_t          door_active;    /* Number of active invocations */
 265         door_pool_t     door_servers;   /* Private pool of server threads */
 266         size_t          door_data_max;  /* param: max request data size */
 267         size_t          door_data_min;  /* param: min request data size */
 268         uint_t          door_desc_max;  /* param: max request descriptors */
 269         uint_t          door_bound_threads; /* number of bound threads */
 270 } door_node_t;
 271
 272 /* Test if a door has been revoked */
 273 #define DOOR_INVALID(dp)        ((dp)->door_flags & DOOR_REVOKED)
 274
 275 struct file;
 276 int     door_insert(struct file *, door_desc_t *);
 277 int     door_finish_dispatch(caddr_t);
 278 uintptr_t door_final_sp(uintptr_t, size_t, int);
 279 int     door_upcall(vnode_t *, door_arg_t *, struct cred *, size_t, uint_t);
 280 void    door_slam(void);
 281 void    door_exit(void);
 282 void    door_revoke_all(void);
 283 void    door_deliver_unref(door_node_t *);
 284 void    door_list_delete(door_node_t *);
 285 void    door_fork(kthread_t *, kthread_t *);
 286 void    door_bind_thread(door_node_t *);
 287 void    door_unbind_thread(door_node_t *);
 288
 289 extern kmutex_t door_knob;
 290 extern kcondvar_t door_cv;
 291 extern size_t door_max_arg;
 292
 293 /*
 294  * In-kernel doors interface.  These functions are considered Sun Private
 295  * and may change incompatibly in a minor release of Solaris.
 296  */
 297 int     door_ki_upcall(door_handle_t, door_arg_t *);
 298 int     door_ki_upcall_limited(door_handle_t, door_arg_t *, struct cred *,
 299     size_t, uint_t);
 300 int     door_ki_create(void (*)(void *, door_arg_t *,
 301     void (**)(void *, void *), void **, int *), void *, door_attr_t,
 302     door_handle_t *);
 303 void    door_ki_hold(door_handle_t);
 304 void    door_ki_rele(door_handle_t);
 305 int     door_ki_open(char *, door_handle_t *);
 306 int     door_ki_info(door_handle_t, door_info_t *);
 307 int     door_ki_getparam(door_handle_t, int, size_t *);
 308 int     door_ki_setparam(door_handle_t, int, size_t);
 309 door_handle_t door_ki_lookup(int did);
 310
 311 #endif  /* defined(_KERNEL) */
 312 #endif  /* !defined(_ASM) */
 313
 314 /*
 315  * System call subcodes
 316  */
 317 #define DOOR_CREATE     0
 318 #define DOOR_REVOKE     1
 319 #define DOOR_INFO       2
 320 #define DOOR_CALL       3
 321 #define DOOR_BIND       6
 322 #define DOOR_UNBIND     7
 323 #define DOOR_UNREFSYS   8
 324 #define DOOR_UCRED      9
 325 #define DOOR_RETURN     10
 326 #define DOOR_GETPARAM   11
 327 #define DOOR_SETPARAM   12
 328
 329 #ifdef  __cplusplus
 330 }
 331 #endif
 332
 333 #endif  /* _SYS_DOOR_H */