2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2005 Paolo Pisati <piso@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * Alias_mod.h defines the outside world interfaces for the packet aliasing
40 MALLOC_DECLARE(M_ALIAS);
42 /* Use kernel allocator. */
43 #if defined(_SYS_MALLOC_H_)
44 #define malloc(x) malloc(x, M_ALIAS, M_NOWAIT|M_ZERO)
45 #define calloc(x, n) malloc(x*n)
46 #define free(x) free(x, M_ALIAS)
50 /* Packet flow direction flags. */
55 /* Working protocol flags. */
61 * Data passed to protocol handler module, it must be filled
62 * right before calling find_handler() to determine which
63 * module is elegible to be called.
66 struct alias_link *lnk;
67 struct in_addr *oaddr; /* Original address. */
68 struct in_addr *aaddr; /* Alias address. */
69 uint16_t *aport; /* Alias port. */
70 uint16_t *sport, *dport; /* Source & destination port */
71 uint16_t maxpktsize; /* Max packet size. */
75 * This structure contains all the information necessary to make
76 * a protocol handler correctly work.
78 struct proto_handler {
79 u_int pri; /* Handler priority. */
80 int16_t dir; /* Flow direction. */
81 uint8_t proto; /* Working protocol. */
82 /* Fingerprint * function. */
83 int (*fingerprint)(struct libalias *, struct alias_data *);
84 /* Aliasing * function. */
85 int (*protohandler)(struct libalias *, struct ip *,
87 TAILQ_ENTRY(proto_handler) link;
90 /* End of handlers. */
91 #define EOH .dir = NODIR
93 /* Functions used with protocol handlers. */
94 int LibAliasAttachHandlers(struct proto_handler *);
95 int LibAliasDetachHandlers(struct proto_handler *);
96 int find_handler(int8_t, int8_t, struct libalias *, struct ip *,
98 struct proto_handler *first_handler(void);
102 * Used only in userland when libalias needs to keep track of all
103 * module loaded. In kernel land (kld mode) we don't need to care
104 * care about libalias modules cause it's kld to do it for us.
108 char name[DLL_LEN]; /* Name of module. */
110 * Ptr to shared obj obtained through
111 * dlopen() - use this ptr to get access
112 * to any symbols from a loaded module
115 SLIST_ENTRY(dll) next;
118 /* Functions used with dll module. */
119 void dll_chain_init(void);
120 void dll_chain_destroy(void);
121 int attach_dll(struct dll *);
122 void *detach_dll(char *);
123 struct dll *walk_dll_chain(void);
126 * Some defines borrowed from sys/module.h used to compile a kld
127 * in userland as a shared lib.
129 typedef enum modeventtype {
136 typedef struct module *module_t;
137 typedef int (*modeventhand_t)(module_t, int /* modeventtype_t */, void *);
140 * Struct for registering modules statically via SYSINIT.
142 typedef struct moduledata {
143 const char *name; /* module name */
144 modeventhand_t evhand; /* event handler */
145 void *priv; /* extra data */
147 #endif /* !_KERNEL */
149 #endif /* !_ALIAS_MOD_H_ */