sys/net/raw_cb.c

   1 /*-
   2  * Copyright (c) 1980, 1986, 1993
   3  *      The Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 4. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  *      @(#)raw_cb.c    8.1 (Berkeley) 6/10/93
  31  * $FreeBSD$
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/domain.h>
  36 #include <sys/lock.h>
  37 #include <sys/kernel.h>
  38 #include <sys/malloc.h>
  39 #include <sys/mutex.h>
  40 #include <sys/protosw.h>
  41 #include <sys/socket.h>
  42 #include <sys/socketvar.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/systm.h>
  45
  46 #include <net/if.h>
  47 #include <net/vnet.h>
  48 #include <net/raw_cb.h>
  49
  50 /*
  51  * Routines to manage the raw protocol control blocks.
  52  *
  53  * TODO:
  54  *      hash lookups by protocol family/protocol + address family
  55  *      take care of unique address problems per AF?
  56  *      redo address binding to allow wildcards
  57  */
  58
  59 struct mtx rawcb_mtx;
  60 VNET_DEFINE(struct rawcb_list_head, rawcb_list);
  61
  62 static SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0,
  63     "Raw socket infrastructure");
  64
  65 static u_long   raw_sendspace = RAWSNDQ;
  66 SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0,
  67     "Default raw socket send space");
  68
  69 static u_long   raw_recvspace = RAWRCVQ;
  70 SYSCTL_ULONG(_net_raw, OID_AUTO, recvspace, CTLFLAG_RW, &raw_recvspace, 0,
  71     "Default raw socket receive space");
  72
  73 /*
  74  * Allocate a control block and a nominal amount of buffer space for the
  75  * socket.
  76  */
  77 int
  78 raw_attach(struct socket *so, int proto)
  79 {
  80         struct rawcb *rp = sotorawcb(so);
  81         int error;
  82
  83         /*
  84          * It is assumed that raw_attach is called after space has been
  85          * allocated for the rawcb; consumer protocols may simply allocate
  86          * type struct rawcb, or a wrapper data structure that begins with a
  87          * struct rawcb.
  88          */
  89         KASSERT(rp != NULL, ("raw_attach: rp == NULL"));
  90
  91         error = soreserve(so, raw_sendspace, raw_recvspace);
  92         if (error)
  93                 return (error);
  94         rp->rcb_socket = so;
  95         rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
  96         rp->rcb_proto.sp_protocol = proto;
  97         mtx_lock(&rawcb_mtx);
  98         LIST_INSERT_HEAD(&V_rawcb_list, rp, list);
  99         mtx_unlock(&rawcb_mtx);
 100         return (0);
 101 }
 102
 103 /*
 104  * Detach the raw connection block and discard socket resources.
 105  */
 106 void
 107 raw_detach(struct rawcb *rp)
 108 {
 109         struct socket *so = rp->rcb_socket;
 110
 111         KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp"));
 112
 113         so->so_pcb = NULL;
 114         mtx_lock(&rawcb_mtx);
 115         LIST_REMOVE(rp, list);
 116         mtx_unlock(&rawcb_mtx);
 117         free((caddr_t)(rp), M_PCB);
 118 }