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