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Diffstat (limited to 'sys/netinet/libalias/alias_mod.h')
| -rw-r--r-- | sys/netinet/libalias/alias_mod.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/sys/netinet/libalias/alias_mod.h b/sys/netinet/libalias/alias_mod.h new file mode 100644 index 0000000..5e193e9 --- /dev/null +++ b/sys/netinet/libalias/alias_mod.h @@ -0,0 +1,157 @@ +/*- + * Copyright (c) 2005 Paolo Pisati <piso@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * Alias_mod.h defines the outside world interfaces for the packet aliasing + * modular framework + */ + +#ifndef _ALIAS_MOD_H_ +#define _ALIAS_MOD_H_ + +#ifdef _KERNEL +MALLOC_DECLARE(M_ALIAS); + +/* Use kernel allocator. */ +#if defined(_SYS_MALLOC_H_) +#define malloc(x) malloc(x, M_ALIAS, M_NOWAIT|M_ZERO) +#define calloc(x, n) malloc(x*n) +#define free(x) free(x, M_ALIAS) +#endif +#endif + +/* Protocol handlers struct & function. */ + +/* Packet flow direction. */ +#define IN 1 +#define OUT 2 + +/* Working protocol. */ +#define IP 1 +#define TCP 2 +#define UDP 4 + +/* + * Data passed to protocol handler module, it must be filled + * right before calling find_handler() to determine which + * module is elegible to be called. + */ + +struct alias_data { + struct alias_link *lnk; + struct in_addr *oaddr; /* Original address. */ + struct in_addr *aaddr; /* Alias address. */ + uint16_t *aport; /* Alias port. */ + uint16_t *sport, *dport; /* Source & destination port */ + uint16_t maxpktsize; /* Max packet size. */ +}; + +/* + * This structure contains all the information necessary to make + * a protocol handler correctly work. + */ + +struct proto_handler { + u_int pri; /* Handler priority. */ + int16_t dir; /* Flow direction. */ + uint8_t proto; /* Working protocol. */ + int (*fingerprint)(struct libalias *la, /* Fingerprint * function. */ + struct ip *pip, struct alias_data *ah); + int (*protohandler)(struct libalias *la, /* Aliasing * function. */ + struct ip *pip, struct alias_data *ah); + LIST_ENTRY(proto_handler) entries; +}; + + +/* + * Used only in userland when libalias needs to keep track of all + * module loaded. In kernel land (kld mode) we don't need to care + * care about libalias modules cause it's kld to do it for us. + */ + +#define DLL_LEN 32 +struct dll { + char name[DLL_LEN]; /* Name of module. */ + void *handle; /* + * Ptr to shared obj obtained through + * dlopen() - use this ptr to get access + * to any symbols from a loaded module + * via dlsym(). + */ + SLIST_ENTRY(dll) next; +}; + +/* Functions used with protocol handlers. */ + +void handler_chain_init(void); +void handler_chain_destroy(void); +int LibAliasAttachHandlers(struct proto_handler *); +int LibAliasDetachHandlers(struct proto_handler *); +int detach_handler(struct proto_handler *); +int find_handler(int8_t, int8_t, struct libalias *, + struct ip *, struct alias_data *); +struct proto_handler *first_handler(void); + +/* Functions used with dll module. */ + +void dll_chain_init(void); +void dll_chain_destroy(void); +int attach_dll(struct dll *); +void *detach_dll(char *); +struct dll *walk_dll_chain(void); + +/* End of handlers. */ +#define EOH -1 + +/* + * Some defines borrowed from sys/module.h used to compile a kld + * in userland as a shared lib. + */ + +#ifndef _KERNEL +typedef enum modeventtype { + MOD_LOAD, + MOD_UNLOAD, + MOD_SHUTDOWN, + MOD_QUIESCE +} modeventtype_t; + +typedef struct module *module_t; +typedef int (*modeventhand_t)(module_t, int /* modeventtype_t */, void *); + +/* + * Struct for registering modules statically via SYSINIT. + */ +typedef struct moduledata { + const char *name; /* module name */ + modeventhand_t evhand; /* event handler */ + void *priv; /* extra data */ +} moduledata_t; +#endif + +#endif /* !_ALIAS_MOD_H_ */ |
