src/lxc/macro.h

   1 /* liblxcapi
   2  *
   3  * Copyright © 2018 Christian Brauner <christian.brauner@ubuntu.com>.
   4  * Copyright © 2018 Canonical Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #ifndef __LXC_MACRO_H
  21 #define __LXC_MACRO_H
  22
  23 /* Define __S_ISTYPE if missing from the C library. */
  24 #ifndef __S_ISTYPE
  25 #define __S_ISTYPE(mode, mask) (((mode)&S_IFMT) == (mask))
  26 #endif
  27
  28 #if HAVE_LIBCAP
  29 #ifndef CAP_SETFCAP
  30 #define CAP_SETFCAP 31
  31 #endif
  32
  33 #ifndef CAP_MAC_OVERRIDE
  34 #define CAP_MAC_OVERRIDE 32
  35 #endif
  36
  37 #ifndef CAP_MAC_ADMIN
  38 #define CAP_MAC_ADMIN 33
  39 #endif
  40 #endif
  41
  42 #ifndef PR_CAPBSET_DROP
  43 #define PR_CAPBSET_DROP 24
  44 #endif
  45
  46 #ifndef LO_FLAGS_AUTOCLEAR
  47 #define LO_FLAGS_AUTOCLEAR 4
  48 #endif
  49
  50 #ifndef CAP_SETUID
  51 #define CAP_SETUID 7
  52 #endif
  53
  54 #ifndef CAP_SETGID
  55 #define CAP_SETGID 6
  56 #endif
  57
  58 /* needed for cgroup automount checks, regardless of whether we
  59  * have included linux/capability.h or not */
  60 #ifndef CAP_SYS_ADMIN
  61 #define CAP_SYS_ADMIN 21
  62 #endif
  63
  64 #ifndef CGROUP_SUPER_MAGIC
  65 #define CGROUP_SUPER_MAGIC 0x27e0eb
  66 #endif
  67
  68 #ifndef CGROUP2_SUPER_MAGIC
  69 #define CGROUP2_SUPER_MAGIC 0x63677270
  70 #endif
  71
  72 #ifndef NSFS_MAGIC
  73 #define NSFS_MAGIC 0x6e736673
  74 #endif
  75
  76 /* Useful macros */
  77 /* Maximum number for 64 bit integer is a string with 21 digits: 2^64 - 1 = 21 */
  78 #define LXC_NUMSTRLEN64 21
  79 #define LXC_LINELEN 4096
  80 #define LXC_IDMAPLEN 4096
  81 #define LXC_MAX_BUFFER 4096
  82 /* /proc/       =    6
  83  *                +
  84  * <pid-as-str> =   LXC_NUMSTRLEN64
  85  *                +
  86  * /fd/         =    4
  87  *                +
  88  * <fd-as-str>  =   LXC_NUMSTRLEN64
  89  *                +
  90  * \0           =    1
  91  */
  92 #define LXC_PROC_PID_FD_LEN (6 + LXC_NUMSTRLEN64 + 4 + LXC_NUMSTRLEN64 + 1)
  93
  94 /* loop devices */
  95 #ifndef LO_FLAGS_AUTOCLEAR
  96 #define LO_FLAGS_AUTOCLEAR 4
  97 #endif
  98
  99 #ifndef LOOP_CTL_GET_FREE
 100 #define LOOP_CTL_GET_FREE 0x4C82
 101 #endif
 102
 103 /* memfd_create() */
 104 #ifndef MFD_CLOEXEC
 105 #define MFD_CLOEXEC 0x0001U
 106 #endif
 107
 108 #ifndef MFD_ALLOW_SEALING
 109 #define MFD_ALLOW_SEALING 0x0002U
 110 #endif
 111
 112 /**
 113  * BUILD_BUG_ON - break compile if a condition is true.
 114  * @condition: the condition which the compiler should know is false.
 115  *
 116  * If you have some code which relies on certain constants being equal, or
 117  * other compile-time-evaluated condition, you should use BUILD_BUG_ON to
 118  * detect if someone changes it.
 119  *
 120  * The implementation uses gcc's reluctance to create a negative array, but
 121  * gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
 122  * to inline functions).  So as a fallback we use the optimizer; if it can't
 123  * prove the condition is false, it will cause a link error on the undefined
 124  * "__build_bug_on_failed".  This error message can be harder to track down
 125  * though, hence the two different methods.
 126  */
 127 #ifndef __OPTIMIZE__
 128 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
 129 #else
 130 extern int __build_bug_on_failed;
 131 #define BUILD_BUG_ON(condition)                                 \
 132         do {                                                    \
 133                 ((void)sizeof(char[1 - 2*!!(condition)]));      \
 134                 if (condition) __build_bug_on_failed = 1;       \
 135         } while(0)
 136 #endif
 137
 138 #define lxc_iterate_parts(__iterator, __splitme, __separators)                  \
 139         for (char *__p = NULL, *__it = strtok_r(__splitme, __separators, &__p); \
 140              (__iterator = __it);                                               \
 141              __iterator = __it = strtok_r(NULL, __separators, &__p))
 142
 143 #define prctl_arg(x) ((unsigned long)x)
 144
 145 /* networking */
 146 #ifndef IFLA_LINKMODE
 147 #define IFLA_LINKMODE 17
 148 #endif
 149
 150 #ifndef IFLA_LINKINFO
 151 #define IFLA_LINKINFO 18
 152 #endif
 153
 154 #ifndef IFLA_NET_NS_PID
 155 #define IFLA_NET_NS_PID 19
 156 #endif
 157
 158 #ifndef IFLA_INFO_KIND
 159 #define IFLA_INFO_KIND 1
 160 #endif
 161
 162 #ifndef IFLA_VLAN_ID
 163 #define IFLA_VLAN_ID 1
 164 #endif
 165
 166 #ifndef IFLA_INFO_DATA
 167 #define IFLA_INFO_DATA 2
 168 #endif
 169
 170 #ifndef VETH_INFO_PEER
 171 #define VETH_INFO_PEER 1
 172 #endif
 173
 174 #ifndef IFLA_MACVLAN_MODE
 175 #define IFLA_MACVLAN_MODE 1
 176 #endif
 177
 178 #ifndef IFLA_NEW_NETNSID
 179 #define IFLA_NEW_NETNSID 45
 180 #endif
 181
 182 #ifndef IFLA_IF_NETNSID
 183 #define IFLA_IF_NETNSID 46
 184 #endif
 185
 186 #endif /* __LXC_MACRO_H */