sys/kern/uipc_domain.c

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   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.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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  *      @(#)uipc_domain.c       8.2 (Berkeley) 10/18/93
  30  * $FreeBSD: src/sys/kern/uipc_domain.c,v 1.22.2.1 2001/07/03 11:01:37 ume Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/socket.h>
  35 #include <sys/protosw.h>
  36 #include <sys/domain.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/kernel.h>
  39 #include <sys/socketvar.h>
  40 #include <sys/socketops.h>
  41 #include <sys/systm.h>
  42 #include <vm/vm_zone.h>
  43
  44 #include <sys/thread2.h>
  45
  46 /*
  47  * System initialization
  48  *
  49  * Note: domain initialization wants to take place on a per domain basis
  50  * as a result of traversing a linker set.  Most likely, each domain
  51  * want to call a registration function rather than being handled here
  52  * in domaininit().  Probably this will look like:
  53  *
  54  * SYSINIT(unique, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, domain_add, xxx);
  55  *
  56  * Where 'xxx' is replaced by the address of a parameter struct to be
  57  * passed to the doamin_add() function.
  58  */
  59
  60 static void domaininit (void *);
  61 SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL);
  62
  63 struct domainlist domains;
  64
  65 /*
  66  * Add a new protocol domain to the list of supported domains
  67  * Note: you cant unload it again because a socket may be using it.
  68  * XXX can't fail at this time.
  69  */
  70 #define PR_NOTSUPP(pr, label)           \
  71         if (pr->pr_ ## label == NULL)   \
  72                 pr->pr_ ## label = pr_generic_notsupp;
  73
  74 #define PRU_NOTSUPP(pu, label)          \
  75         if (pu->pru_ ## label == NULL)  \
  76                 pu->pru_ ## label = pr_generic_notsupp;
  77
  78 static void
  79 net_init_domain(struct domain *dp)
  80 {
  81         struct protosw *pr;
  82         struct pr_usrreqs *pu;
  83
  84         crit_enter();
  85
  86         if (dp->dom_init)
  87                 (*dp->dom_init)();
  88
  89         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
  90                 pu = pr->pr_usrreqs;
  91                 if (pu == NULL) {
  92                         panic("domaininit: %ssw[%ld] has no usrreqs!",
  93                               dp->dom_name, (long)(pr - dp->dom_protosw));
  94                 }
  95                 PR_NOTSUPP(pr, ctloutput);
  96                 PRU_NOTSUPP(pu, accept);
  97                 PRU_NOTSUPP(pu, bind);
  98                 PRU_NOTSUPP(pu, connect);
  99                 PRU_NOTSUPP(pu, connect2);
 100                 PRU_NOTSUPP(pu, control);
 101                 PRU_NOTSUPP(pu, disconnect);
 102                 PRU_NOTSUPP(pu, listen);
 103                 PRU_NOTSUPP(pu, peeraddr);
 104                 PRU_NOTSUPP(pu, rcvd);
 105                 PRU_NOTSUPP(pu, rcvoob);
 106                 PRU_NOTSUPP(pu, shutdown);
 107                 PRU_NOTSUPP(pu, sockaddr);
 108
 109                 if (pu->pru_sense == NULL)
 110                         pu->pru_sense = pru_sense_null;
 111                 if (pu->pru_sosend == NULL)
 112                         pu->pru_sosend = pru_sosend_notsupp;
 113                 if (pu->pru_soreceive == NULL)
 114                         pu->pru_soreceive = pru_soreceive_notsupp;
 115
 116                 if (pr->pr_init)
 117                         (*pr->pr_init)();
 118         }
 119         /*
 120          * update global information about maximums
 121          */
 122         max_hdr = max_linkhdr + max_protohdr;
 123         max_datalen = MHLEN - max_hdr;
 124         crit_exit();
 125 }
 126
 127 /*
 128  * Add a new protocol domain to the list of supported domains
 129  * Note: you cant unload it again because a socket may be using it.
 130  * XXX can't fail at this time.
 131  */
 132 void
 133 net_add_domain(void *data)
 134 {
 135         struct domain *dp = data;
 136
 137         crit_enter();
 138         SLIST_INSERT_HEAD(&domains, dp, dom_next);
 139         crit_exit();
 140         net_init_domain(dp);
 141 }
 142
 143 /* ARGSUSED*/
 144 static void
 145 domaininit(void *dummy)
 146 {
 147         if (max_linkhdr < 20)           /* XXX */
 148                 max_linkhdr = 20;
 149 }
 150
 151
 152 struct protosw *
 153 pffindtype(int family, int type)
 154 {
 155         struct domain *dp;
 156         struct protosw *pr;
 157
 158         SLIST_FOREACH(dp, &domains, dom_next)
 159                 if (dp->dom_family == family)
 160                         goto found;
 161         return (NULL);
 162
 163 found:
 164         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 165                 if (pr->pr_type && pr->pr_type == type)
 166                         return (pr);
 167         return (NULL);
 168 }
 169
 170 struct protosw *
 171 pffindproto(int family, int protocol, int type)
 172 {
 173         struct domain *dp;
 174         struct protosw *pr;
 175         struct protosw *maybe = NULL;
 176
 177         if (family == 0)
 178                 return (NULL);
 179         SLIST_FOREACH(dp, &domains, dom_next)
 180                 if (dp->dom_family == family)
 181                         goto found;
 182         return (NULL);
 183
 184 found:
 185         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
 186                 if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
 187                         return (pr);
 188
 189                 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
 190                     pr->pr_protocol == 0 && maybe == NULL)
 191                         maybe = pr;
 192         }
 193         return (maybe);
 194 }
 195
 196 void
 197 kpfctlinput(int cmd, struct sockaddr *sa)
 198 {
 199         struct domain *dp;
 200         struct protosw *pr;
 201
 202         SLIST_FOREACH(dp, &domains, dom_next) {
 203                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 204                         so_pr_ctlinput(pr, cmd, sa, NULL);
 205         }
 206 }
 207
 208 void
 209 kpfctlinput_direct(int cmd, struct sockaddr *sa)
 210 {
 211         struct domain *dp;
 212         struct protosw *pr;
 213
 214         SLIST_FOREACH(dp, &domains, dom_next) {
 215                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 216                         so_pr_ctlinput_direct(pr, cmd, sa, NULL);
 217         }
 218 }
 219
 220 void
 221 kpfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam)
 222 {
 223         struct domain *dp;
 224         struct protosw *pr;
 225
 226         if (!sa)
 227                 return;
 228         SLIST_FOREACH(dp, &domains, dom_next) {
 229                 /*
 230                  * the check must be made by xx_ctlinput() anyways, to
 231                  * make sure we use data item pointed to by ctlparam in
 232                  * correct way.  the following check is made just for safety.
 233                  */
 234                 if (dp->dom_family != sa->sa_family)
 235                         continue;
 236
 237                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 238                         so_pr_ctlinput(pr, cmd, sa, ctlparam);
 239         }
 240 }