FreeBSD/Linux Kernel Cross Reference
sys/netinet/libalias/alias_mod.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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_)
    #undef malloc
    #define malloc(x)       malloc(x, M_ALIAS, M_NOWAIT|M_ZERO)
    #define calloc(n, x)    mallocarray((n), (x), M_ALIAS, M_NOWAIT|M_ZERO)
    #define free(x)         free(x, M_ALIAS)
    #endif
    #endif
    
    /* Packet flow direction flags. */
    #define IN      0x0001
    #define OUT     0x0002
    #define NODIR   0x4000
    
    /* Working protocol flags. */
    #define IP      0x01
    #define TCP     0x02
    #define UDP     0x04
    
    /*
     * 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. */
            /* Fingerprint * function. */
            int (*fingerprint)(struct libalias *, struct alias_data *);
            /* Aliasing * function. */
            int (*protohandler)(struct libalias *, struct ip *,
                struct alias_data *);
            TAILQ_ENTRY(proto_handler) link;
    };
    
    /* End of handlers. */
    #define EOH     .dir = NODIR
    
    /* Functions used with protocol handlers. */
    int LibAliasAttachHandlers(struct proto_handler *);
    int LibAliasDetachHandlers(struct proto_handler *);
    int find_handler(int8_t, int8_t, struct libalias *, struct ip *,
        struct alias_data *);
    struct proto_handler *first_handler(void);
   
   #ifndef _KERNEL
   /*
    * 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 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);
   
   /*
    * Some defines borrowed from sys/module.h used to compile a kld
    * in userland as a shared lib.
    */
   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 /* !_KERNEL */
   
   #endif /* !_ALIAS_MOD_H_ */

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