git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Routines to manage notifier chains for passing status changes to any | |
| 3 | * interested routines. We need this instead of hard coded call lists so | |
| 4 | * that modules can poke their nose into the innards. The network devices | |
| 5 | * needed them so here they are for the rest of you. | |
| 6 | * | |
| 7 | * Alan Cox <Alan.Cox@linux.org> | |
| 8 | */ | |
| 9 | ||
| 10 | #ifndef _LINUX_NOTIFIER_H | |
| 11 | #define _LINUX_NOTIFIER_H | |
| 12 | #include <linux/errno.h> | |
| 13 | ||
| 14 | struct notifier_block | |
| 15 | { | |
| 16 | int (*notifier_call)(struct notifier_block *self, unsigned long, void *); | |
| 17 | struct notifier_block *next; | |
| 18 | int priority; | |
| 19 | }; | |
| 20 | ||
| 21 | ||
| 22 | #ifdef __KERNEL__ | |
| 23 | ||
| 24 | extern int notifier_chain_register(struct notifier_block **list, struct notifier_block *n); | |
| 25 | extern int notifier_chain_unregister(struct notifier_block **nl, struct notifier_block *n); | |
| 26 | extern int notifier_call_chain(struct notifier_block **n, unsigned long val, void *v); | |
| 27 | ||
| 28 | #define NOTIFY_DONE 0x0000 /* Don't care */ | |
| 29 | #define NOTIFY_OK 0x0001 /* Suits me */ | |
| 30 | #define NOTIFY_STOP_MASK 0x8000 /* Don't call further */ | |
| 31 | #define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002) /* Bad/Veto action */ | |
| 32 | /* | |
| 33 | * Clean way to return from the notifier and stop further calls. | |
| 34 | */ | |
| 35 | #define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK) | |
| 36 | ||
| 37 | /* | |
| 38 | * Declared notifiers so far. I can imagine quite a few more chains | |
| 39 | * over time (eg laptop power reset chains, reboot chain (to clean | |
| 40 | * device units up), device [un]mount chain, module load/unload chain, | |
| 41 | * low memory chain, screenblank chain (for plug in modular screenblankers) | |
| 42 | * VC switch chains (for loadable kernel svgalib VC switch helpers) etc... | |
| 43 | */ | |
| 44 | ||
| 45 | /* netdevice notifier chain */ | |
| 46 | #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */ | |
| 47 | #define NETDEV_DOWN 0x0002 | |
| 48 | #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface | |
| 49 | detected a hardware crash and restarted | |
| 50 | - we can use this eg to kick tcp sessions | |
| 51 | once done */ | |
| 52 | #define NETDEV_CHANGE 0x0004 /* Notify device state change */ | |
| 53 | #define NETDEV_REGISTER 0x0005 | |
| 54 | #define NETDEV_UNREGISTER 0x0006 | |
| 55 | #define NETDEV_CHANGEMTU 0x0007 | |
| 56 | #define NETDEV_CHANGEADDR 0x0008 | |
| 57 | #define NETDEV_GOING_DOWN 0x0009 | |
| 58 | #define NETDEV_CHANGENAME 0x000A | |
| d8a33ac4 | 59 | #define NETDEV_FEAT_CHANGE 0x000B |
| 1da177e4 LT |
60 | |
| 61 | #define SYS_DOWN 0x0001 /* Notify of system down */ | |
| 62 | #define SYS_RESTART SYS_DOWN | |
| 63 | #define SYS_HALT 0x0002 /* Notify of system halt */ | |
| 64 | #define SYS_POWER_OFF 0x0003 /* Notify of system power off */ | |
| 65 | ||
| 66 | #define NETLINK_URELEASE 0x0001 /* Unicast netlink socket released */ | |
| 67 | ||
| 68 | #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ | |
| 69 | #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ | |
| 70 | #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ | |
| 71 | #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ | |
| 72 | #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ | |
| 73 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ | |
| 74 | ||
| 75 | #endif /* __KERNEL__ */ | |
| 76 | #endif /* _LINUX_NOTIFIER_H */ |