1 #ifndef __LINUX_KMOD_H__ 2 #define __LINUX_KMOD_H__ 3 4 /* 5 * include/linux/kmod.h 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 #include <linux/gfp.h> 23 #include <linux/stddef.h> 24 #include <linux/errno.h> 25 #include <linux/compiler.h> 26 #include <linux/workqueue.h> 27 28 #define KMOD_PATH_LEN 256 29 30 #ifdef CONFIG_MODULES 31 extern char modprobe_path[]; /* for sysctl */ 32 /* modprobe exit status on success, -ve on error. Return value 33 * usually useless though. */ 34 extern int __request_module(bool wait, const char *name, ...) \ 35 __attribute__((format(printf, 2, 3))); 36 #define request_module(mod...) __request_module(true, mod) 37 #define request_module_nowait(mod...) __request_module(false, mod) 38 #define try_then_request_module(x, mod...) \ 39 ((x) ?: (__request_module(true, mod), (x))) 40 #else 41 static inline int request_module(const char *name, ...) { return -ENOSYS; } 42 static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; } 43 #define try_then_request_module(x, mod...) (x) 44 #endif 45 46 47 struct key; 48 struct file; 49 50 enum umh_wait { 51 UMH_NO_WAIT = -1, /* don't wait at all */ 52 UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */ 53 UMH_WAIT_PROC = 1, /* wait for the process to complete */ 54 }; 55 56 struct subprocess_info { 57 struct work_struct work; 58 struct completion *complete; 59 struct cred *cred; 60 char *path; 61 char **argv; 62 char **envp; 63 enum umh_wait wait; 64 int retval; 65 struct file *stdin; 66 int (*init)(struct subprocess_info *info); 67 void (*cleanup)(struct subprocess_info *info); 68 void *data; 69 }; 70 71 /* Allocate a subprocess_info structure */ 72 struct subprocess_info *call_usermodehelper_setup(char *path, char **argv, 73 char **envp, gfp_t gfp_mask); 74 75 /* Set various pieces of state into the subprocess_info structure */ 76 void call_usermodehelper_setkeys(struct subprocess_info *info, 77 struct key *session_keyring); 78 int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info, 79 struct file **filp); 80 void call_usermodehelper_setfns(struct subprocess_info *info, 81 int (*init)(struct subprocess_info *info), 82 void (*cleanup)(struct subprocess_info *info), 83 void *data); 84 85 /* Actually execute the sub-process */ 86 int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait); 87 88 /* Free the subprocess_info. This is only needed if you're not going 89 to call call_usermodehelper_exec */ 90 void call_usermodehelper_freeinfo(struct subprocess_info *info); 91 92 static inline int 93 call_usermodehelper_fns(char *path, char **argv, char **envp, 94 enum umh_wait wait, 95 int (*init)(struct subprocess_info *info), 96 void (*cleanup)(struct subprocess_info *), void *data) 97 { 98 struct subprocess_info *info; 99 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL; 100 101 info = call_usermodehelper_setup(path, argv, envp, gfp_mask); 102 103 if (info == NULL) 104 return -ENOMEM; 105 106 call_usermodehelper_setfns(info, init, cleanup, data); 107 108 return call_usermodehelper_exec(info, wait); 109 } 110 111 static inline int 112 call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait) 113 { 114 return call_usermodehelper_fns(path, argv, envp, wait, 115 NULL, NULL, NULL); 116 } 117 118 static inline int 119 call_usermodehelper_keys(char *path, char **argv, char **envp, 120 struct key *session_keyring, enum umh_wait wait) 121 { 122 struct subprocess_info *info; 123 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL; 124 125 info = call_usermodehelper_setup(path, argv, envp, gfp_mask); 126 if (info == NULL) 127 return -ENOMEM; 128 129 call_usermodehelper_setkeys(info, session_keyring); 130 return call_usermodehelper_exec(info, wait); 131 } 132 133 extern void usermodehelper_init(void); 134 135 struct file; 136 extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[], 137 struct file **filp); 138 139 extern int usermodehelper_disable(void); 140 extern void usermodehelper_enable(void); 141 142 #endif /* __LINUX_KMOD_H__ */ 143