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

     /*-
      * 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.
     *
     */
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #ifdef _KERNEL
    #include <sys/libkern.h>
    #include <sys/param.h>
    #include <sys/lock.h>
    #include <sys/rwlock.h>
    #else
    #include <stdio.h>
    #include <string.h>
    #include <sys/types.h>
    #include <errno.h>
    #endif
    
    #include <netinet/in_systm.h>
    #include <netinet/in.h>
    #include <netinet/ip.h>
    
    #ifdef _KERNEL
    #include <netinet/libalias/alias_local.h>
    #include <netinet/libalias/alias_mod.h>
    #else
    #include "alias_local.h"
    #include "alias_mod.h"
    #endif
    
    /* Protocol and userland module handlers chains. */
    static TAILQ_HEAD(handler_chain, proto_handler) handler_chain =
        TAILQ_HEAD_INITIALIZER(handler_chain);
    
    static int
    attach_handler(struct proto_handler *p)
    {
            struct proto_handler *b;
    
            TAILQ_FOREACH(b, &handler_chain, link) {
                    if ((b->pri == p->pri) &&
                        (b->dir == p->dir) &&
                        (b->proto == p->proto))
                            return (EEXIST);
                    if (b->pri > p->pri) {
                            TAILQ_INSERT_BEFORE(b, p, link);
                            return (0);
                    }
            }
    
            TAILQ_INSERT_TAIL(&handler_chain, p, link);
    
            return (0);
    }
    
    int
    LibAliasAttachHandlers(struct proto_handler *p)
    {
            int error;
    
            while (p->dir != NODIR) {
                    error = attach_handler(p);
                    if (error)
                            return (error);
                    p++;
            }
    
            return (0);
    }
    
    /* XXXGL: should be void, but no good reason to break ABI */
    int
    LibAliasDetachHandlers(struct proto_handler *p)
    {
           while (p->dir != NODIR) {
                   TAILQ_REMOVE(&handler_chain, p, link);
                   p++;
           }
   
           return (0);
   }
   
   int
   find_handler(int8_t dir, int8_t proto, struct libalias *la, struct ip *ip,
       struct alias_data *ad)
   {
           struct proto_handler *p;
   
           TAILQ_FOREACH(p, &handler_chain, link)
                   if ((p->dir & dir) && (p->proto & proto) &&
                       p->fingerprint(la, ad) == 0)
                           return (p->protohandler(la, ip, ad));
   
           return (ENOENT);
   }
   
   struct proto_handler *
   first_handler(void)
   {
           return (TAILQ_FIRST(&handler_chain));
   }
   
   #ifndef _KERNEL
   /* Dll manipulation code - this code is not thread safe... */
   static SLIST_HEAD(dll_chain, dll) dll_chain = SLIST_HEAD_INITIALIZER(dll_chain);
   int
   attach_dll(struct dll *p)
   {
           struct dll *b;
   
           SLIST_FOREACH(b, &dll_chain, next) {
                   if (!strncmp(b->name, p->name, DLL_LEN))
                           return (EEXIST); /* Dll name conflict. */
           }
           SLIST_INSERT_HEAD(&dll_chain, p, next);
           return (0);
   }
   
   void *
   detach_dll(char *p)
   {
           struct dll *b, *b_tmp;
           void *error;
   
           b = NULL;
           error = NULL;
           SLIST_FOREACH_SAFE(b, &dll_chain, next, b_tmp)
                   if (!strncmp(b->name, p, DLL_LEN)) {
                           SLIST_REMOVE(&dll_chain, b, dll, next);
                           error = b;
                           break;
                   }
           return (error);
   }
   
   struct dll *
   walk_dll_chain(void)
   {
           struct dll *t;
   
           t = SLIST_FIRST(&dll_chain);
           if (t == NULL)
                   return (NULL);
           SLIST_REMOVE_HEAD(&dll_chain, next);
           return (t);
   }
   #endif /* !_KERNEL */

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