716e0a81315b2c4dc283faa97d46a890a9a87661
[util-vserver.git] / util-vserver / lib / vserver-internal.h
1 // $Id$    --*- c++ -*--
2
3 // Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
4 //  
5 // This program is free software; you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation; version 2 of the License.
8 //  
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 // GNU General Public License for more details.
13 //  
14 // You should have received a copy of the GNU General Public License
15 // along with this program; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17
18 #ifdef H_VSERVER_SYSCALL_INTERNAL_H
19 #  error vserver-internal.h must not be included more than once
20 #endif
21
22 #ifndef H_VSERVER_SYSCALL_INTERNAL_H
23 #define H_VSERVER_SYSCALL_INTERNAL_H
24
25 #include <asm/unistd.h>
26 #include <syscall.h>
27 #include <errno.h>
28 #include <stdint.h>
29 #include <sys/syscall.h>
30 #include <unistd.h>
31
32 #include "internal.h"
33
34 #if !defined(__NR_vserver) && defined(ENSC_SYSCALL__NR_vserver)
35 #  define __NR_vserver  ENSC_SYSCALL__NR_vserver
36 #endif
37
38 #define VC_PREFIX       0)
39 #define VC_SUFFIX       else (void)((void)0
40 #define CALL_VC_NOOP    (void)0
41 #define CALL_VC_GENERAL(ID, SUFFIX, FUNC, ...)                          \
42   VC_PREFIX; VC_SELECT(ID) return FUNC ## _ ## SUFFIX(__VA_ARGS__); VC_SUFFIX
43
44 #ifdef VC_MULTIVERSION_SYSCALL
45 #  define VC_SELECT(ID) if (ver>=(ID))
46 #  define CALL_VC(...)                                  \
47   do {                                                  \
48     int ver = utilvserver_checkCompatVersion();         \
49     if (ver==-1) return -1;                             \
50     VC_SUFFIX, __VA_ARGS__, VC_PREFIX;                  \
51     errno = ENOSYS;                                     \
52     return -1;                                          \
53   } while (0)
54 #else
55 #  define VC_SELECT(ID) if (1)
56 #  define CALL_VC(...)                                  \
57   do {                                                  \
58     if (1) {} VC_SUFFIX, __VA_ARGS__, VC_PREFIX;        \
59     errno = ENOSYS; return -1;                          \
60   } while (0)
61 #endif
62
63 #ifdef VC_ENABLE_API_COMPAT
64 #  define CALL_VC_COMPAT(F,...) CALL_VC_GENERAL(0x00010000, compat, F, __VA_ARGS__)
65 #else
66 #  define CALL_VC_COMPAT(F,...) CALL_VC_NOOP
67 #endif
68
69 #ifdef VC_ENABLE_API_LEGACY
70 #  define CALL_VC_LEGACY(F,...) CALL_VC_GENERAL(0x00000000, legacy, F, __VA_ARGS__)
71 #else
72 #  define CALL_VC_LEGACY(F,...) CALL_VC_NOOP
73 #endif
74
75 #ifdef VC_ENABLE_API_V11
76 #  define CALL_VC_V11(F,...)    CALL_VC_GENERAL(0x00010000, v11, F, __VA_ARGS__)
77 #else
78 #  define CALL_VC_V11(F,...)    CALL_VC_NOOP
79 #endif
80
81 #ifdef VC_ENABLE_API_V13
82 #  define CALL_VC_V13(F,...)    CALL_VC_GENERAL(0x00010011, v13, F, __VA_ARGS__)
83 #else
84 #  define CALL_VC_V13(F,...)    CALL_VC_NOOP
85 #endif
86
87 #ifdef VC_ENABLE_API_V13
88 #  define CALL_VC_V13A(F,...)   CALL_VC_GENERAL(0x00010012, v13, F, __VA_ARGS__)
89 #else
90 #  define CALL_VC_V13A(F,...)   CALL_VC_NOOP
91 #endif
92
93 #ifdef VC_ENABLE_API_V13
94 #  define CALL_VC_V13B(F,...)   CALL_VC_GENERAL(0x00010021, v13b, F, __VA_ARGS__)
95 #else
96 #  define CALL_VC_V13B(F,...)   CALL_VC_NOOP
97 #endif
98
99 #ifdef VC_ENABLE_API_V13
100 #  define CALL_VC_V13OBS(F,...) CALL_VC_GENERAL(0x00010011, v13obs, F, __VA_ARGS__)
101 #else
102 #  define CALL_VC_V13OBS(F,...) CALL_VC_NOOP
103 #endif
104
105
106 #ifdef VC_ENABLE_API_NET
107 #  define CALL_VC_NET(F,...)    CALL_VC_GENERAL(0x00010016, net, F, __VA_ARGS__)
108 #else
109 #  define CALL_VC_NET(F,...)    CALL_VC_NOOP
110 #endif
111
112 #ifdef VC_ENABLE_API_FSCOMPAT
113 #  define CALL_VC_FSCOMPAT(F,...)       CALL_VC_GENERAL(0x00010000, fscompat, F, __VA_ARGS__)
114 #else
115 #  define CALL_VC_FSCOMPAT(F,...)       CALL_VC_NOOP
116 #endif
117
118 #ifdef VC_ENABLE_API_OLDPROC
119 #  define CALL_VC_OLDPROC(F,...)        CALL_VC_GENERAL(0x00000000, oldproc, F, __VA_ARGS__)
120 #else
121 #  define CALL_VC_OLDPROC(F,...)        CALL_VC_NOOP
122 #endif
123
124 #ifdef VC_ENABLE_API_OLDUTS
125 #  define CALL_VC_OLDUTS(F,...)         CALL_VC_GENERAL(0x00000000, olduts, F, __VA_ARGS__)
126 #else
127 #  define CALL_VC_OLDUTS(F,...)         CALL_VC_NOOP
128 #endif
129
130
131   // Some  kernel <-> userspace wrappers; they should be noops in most cases
132
133 #if 1
134 #  define CTX_KERNEL2USER(X)    (((X)==(uint32_t)(-1)) ? VC_NOCTX   : \
135                                  ((X)==(uint32_t)(-2)) ? VC_SAMECTX : \
136                                  (xid_t)(X))
137
138 #  define CTX_USER2KERNEL(X)    (((X)==VC_DYNAMIC_XID) ? (uint32_t)(-1) : \
139                                  ((X)==VC_SAMECTX)     ? (uint32_t)(-2) : \
140                                  (uint32_t)(X))
141 #else
142 #  define CTX_USER2KERNEL(X)    (X)
143 #  define CTX_KERNEL2USER(X)    (X)
144 #endif
145
146 #if 1
147 #  define EXT2FLAGS_USER2KERNEL(X)      (((X) & ~(VC_IMMUTABLE_FILE_FL|VC_IMMUTABLE_LINK_FL)) | \
148                                          ((X) & VC_IMMUTABLE_FILE_FL ? EXT2_IMMUTABLE_FILE_FL : 0) | \
149                                          ((X) & VC_IMMUTABLE_LINK_FL ? EXT2_IMMUTABLE_LINK_FL : 0))
150 #  define EXT2FLAGS_KERNEL2USER(X)      (((X) & ~(EXT2_IMMUTABLE_FILE_FL|EXT2_IMMUTABLE_LINK_FL)) | \
151                                          ((X) & EXT2_IMMUTABLE_FILE_FL ? VC_IMMUTABLE_FILE_FL : 0) | \
152                                          ((X) & EXT2_IMMUTABLE_LINK_FL ? VC_IMMUTABLE_LINK_FL : 0))
153 #else
154 #  define EXT2FLAGS_KERNEL2USER(X)      (X)
155 #  define EXT2FLAGS_USER2KERNEL(X)      (X)
156 #endif
157
158 #if 1
159 #  define VHI_USER2KERNEL(X)            ((((X)==vcVHI_CONTEXT)    ? VHIN_CONTEXT    : \
160                                           ((X)==vcVHI_SYSNAME)    ? VHIN_SYSNAME    : \
161                                           ((X)==vcVHI_NODENAME)   ? VHIN_NODENAME   : \
162                                           ((X)==vcVHI_RELEASE)    ? VHIN_RELEASE    : \
163                                           ((X)==vcVHI_VERSION)    ? VHIN_VERSION    : \
164                                           ((X)==vcVHI_MACHINE)    ? VHIN_MACHINE    : \
165                                           ((X)==vcVHI_DOMAINNAME) ? VHIN_DOMAINNAME : \
166                                           (X)))
167 #  define VHI_KERNEL2USER(X)            ((((X)==VHIN_CONTEXT)     ? vcVHI_CONTEXT    : \
168                                           ((X)==VHIN_SYSNAME)     ? vcVHI_SYSNAME    : \
169                                           ((X)==VHIN_NODENAME)    ? vcVHI_NODENAME   : \
170                                           ((X)==VHIN_RELEASE)     ? vcVHI_RELEASE    : \
171                                           ((X)==VHIN_VERSION)     ? vcVHI_VERSION    : \
172                                           ((X)==VHIN_MACHINE)     ? vcVHI_MACHINE    : \
173                                           ((X)==VHIN_DOMAINNAME)  ? vcVHI_DOMAINNAME : \
174                                           (X)))
175 #else
176 #  define VHI_USER2KERNEL(X)            (X)
177 #  define VHI_KERNEL2USER(X)            (X)
178 #endif
179
180 #if 1
181 #  define NID_KERNEL2USER(X)    (((X)==(uint32_t)(-1)) ? VC_NONID   : \
182                                  (xid_t)(X))
183
184 #  define NID_USER2KERNEL(X)    (((X)==VC_DYNAMIC_NID) ? (uint32_t)(-1) : \
185                                  (uint32_t)(X))
186 #else
187 #  define NID_USER2KERNEL(X)    (X)
188 #  define NID_KERNEL2USER(X)    (X)
189 #endif
190
191 #if 1
192 #  define NETTYPE_USER2KERNEL(X)        ((X)==vcNET_IPV4   ? 0 : \
193                                          (X)==vcNET_IPV6   ? 1 : \
194                                          (X)==vcNET_IPV4R  ? 2 : \
195                                          (X)==vcNET_IPV6R  ? 3 : \
196                                          (X))
197 #  define NETTYPE_KERNEL2USER(X)        ((X)==0 ? vcNET_IPV4   ? : \
198                                          (X)==1 ? vcNET_IPV6   ? : \
199                                          (X)==2 ? vcNET_IPV4R  ? : \
200                                          (X)==3 ? vcNET_IPV6R  ? : \
201                                          (vc_net_nx_type)(X))
202 #else
203 #  define NETTYPE_USER2KERNEL(X)        (X)
204 #  define NETTYPE_KERNEL2USER(X)        (X)
205 #endif
206
207
208 #define ENSC_STRUCT_IDX(STRUCT,ATTR) \
209   ((char*)(&(STRUCT).ATTR) - (char*)(&(STRUCT)))
210 #define ENSC_SAME_STRUCT_IDX(LHS,RHS,ATTR) \
211   (ENSC_STRUCT_IDX(LHS,ATTR) == ENSC_STRUCT_IDX(RHS,ATTR))
212
213 #define EXT2_IOC_GETCONTEXT             _IOR('x', 1, long)
214 #define EXT2_IOC_SETCONTEXT             _IOW('x', 2, long)
215
216 #ifndef HAVE_VSERVER
217 #ifdef ENSC_SYSCALL_TRADITIONAL
218 inline static UNUSED ALWAYSINLINE
219 int vserver(uint32_t cmd, uint32_t id, void *data)
220 {
221 #if defined __dietlibc__
222   extern long int syscall (long int __sysno, ...);
223 #endif
224  
225   return syscall(__NR_vserver, cmd, id, data);
226 }
227 #else
228 inline static UNUSED ALWAYSINLINE
229 _syscall3(int, vserver,
230           uint32_t, cmd, uint32_t, id, void *, data)
231 #endif
232 #endif
233
234 #endif  //  H_VSERVER_SYSCALL_INTERNAL_H