The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_pcbgroup.c

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    1 /*-
    2  * Copyright (c) 2010-2011 Juniper Networks, Inc.
    3  * All rights reserved.
    4  *
    5  * This software was developed by Robert N. M. Watson under contract
    6  * to Juniper Networks, Inc.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/mbuf.h>
   38 
   39 #include <netinet/in.h>
   40 #include <netinet/in_pcb.h>
   41 #ifdef INET6
   42 #include <netinet6/in6_pcb.h>
   43 #endif /* INET6 */
   44 
   45 /*
   46  * Given a hash of whatever the covered tuple might be, return a pcbgroup
   47  * index.
   48  */
   49 static __inline u_int
   50 in6_pcbgroup_getbucket(struct inpcbinfo *pcbinfo, uint32_t hash)
   51 {
   52 
   53         return (hash % pcbinfo->ipi_npcbgroups);
   54 }
   55 
   56 /*
   57  * Map a (hashtype, hash) tuple into a connection group, or NULL if the hash 
   58  * information is insufficient to identify the pcbgroup.
   59  */
   60 struct inpcbgroup *
   61 in6_pcbgroup_byhash(struct inpcbinfo *pcbinfo, u_int hashtype, uint32_t hash)
   62 {
   63 
   64         return (NULL);
   65 }
   66 
   67 struct inpcbgroup *
   68 in6_pcbgroup_bymbuf(struct inpcbinfo *pcbinfo, struct mbuf *m)
   69 {
   70 
   71         return (in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
   72             m->m_pkthdr.flowid));
   73 }
   74 
   75 struct inpcbgroup *
   76 in6_pcbgroup_bytuple(struct inpcbinfo *pcbinfo, const struct in6_addr *laddrp,
   77     u_short lport, const struct in6_addr *faddrp, u_short fport)
   78 {
   79         uint32_t hash;
   80 
   81         switch (pcbinfo->ipi_hashfields) {
   82         case IPI_HASHFIELDS_4TUPLE:
   83                 hash = faddrp->s6_addr32[3] ^ fport;
   84                 break;
   85 
   86         case IPI_HASHFIELDS_2TUPLE:
   87                 hash = faddrp->s6_addr32[3] ^ laddrp->s6_addr32[3];
   88                 break;
   89 
   90         default:
   91                 hash = 0;
   92         }
   93         return (&pcbinfo->ipi_pcbgroups[in6_pcbgroup_getbucket(pcbinfo,
   94             hash)]);
   95 }
   96 
   97 struct inpcbgroup *
   98 in6_pcbgroup_byinpcb(struct inpcb *inp)
   99 {
  100 
  101         return (in6_pcbgroup_bytuple(inp->inp_pcbinfo, &inp->in6p_laddr,
  102             inp->inp_lport, &inp->in6p_faddr, inp->inp_fport));
  103 }

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