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 static void     pffasttimo (void *);
  64 static void     pfslowtimo (void *);
  65
  66 struct domainlist domains;
  67
  68 static struct callout pffasttimo_ch;
  69 static struct callout pfslowtimo_ch;
  70
  71 /*
  72  * Add a new protocol domain to the list of supported domains
  73  * Note: you cant unload it again because a socket may be using it.
  74  * XXX can't fail at this time.
  75  */
  76 #define PR_NOTSUPP(pr, label)           \
  77         if (pr->pr_ ## label == NULL)   \
  78                 pr->pr_ ## label = pr_generic_notsupp;
  79
  80 #define PRU_NOTSUPP(pu, label)          \
  81         if (pu->pru_ ## label == NULL)  \
  82                 pu->pru_ ## label = pr_generic_notsupp;
  83
  84 static void
  85 net_init_domain(struct domain *dp)
  86 {
  87         struct protosw *pr;
  88         struct pr_usrreqs *pu;
  89
  90         crit_enter();
  91
  92         if (dp->dom_init)
  93                 (*dp->dom_init)();
  94
  95         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
  96                 pu = pr->pr_usrreqs;
  97                 if (pu == NULL) {
  98                         panic("domaininit: %ssw[%ld] has no usrreqs!",
  99                               dp->dom_name, (long)(pr - dp->dom_protosw));
 100                 }
 101                 PR_NOTSUPP(pr, ctloutput);
 102                 PRU_NOTSUPP(pu, accept);
 103                 PRU_NOTSUPP(pu, bind);
 104                 PRU_NOTSUPP(pu, connect);
 105                 PRU_NOTSUPP(pu, connect2);
 106                 PRU_NOTSUPP(pu, control);
 107                 PRU_NOTSUPP(pu, disconnect);
 108                 PRU_NOTSUPP(pu, listen);
 109                 PRU_NOTSUPP(pu, peeraddr);
 110                 PRU_NOTSUPP(pu, rcvd);
 111                 PRU_NOTSUPP(pu, rcvoob);
 112                 PRU_NOTSUPP(pu, shutdown);
 113                 PRU_NOTSUPP(pu, sockaddr);
 114
 115                 if (pu->pru_sense == NULL)
 116                         pu->pru_sense = pru_sense_null;
 117                 if (pu->pru_sosend == NULL)
 118                         pu->pru_sosend = pru_sosend_notsupp;
 119                 if (pu->pru_soreceive == NULL)
 120                         pu->pru_soreceive = pru_soreceive_notsupp;
 121
 122                 if (pr->pr_init)
 123                         (*pr->pr_init)();
 124         }
 125         /*
 126          * update global information about maximums
 127          */
 128         max_hdr = max_linkhdr + max_protohdr;
 129         max_datalen = MHLEN - max_hdr;
 130         crit_exit();
 131 }
 132
 133 /*
 134  * Add a new protocol domain to the list of supported domains
 135  * Note: you cant unload it again because a socket may be using it.
 136  * XXX can't fail at this time.
 137  */
 138 void
 139 net_add_domain(void *data)
 140 {
 141         struct domain *dp = data;
 142
 143         crit_enter();
 144         SLIST_INSERT_HEAD(&domains, dp, dom_next);
 145         crit_exit();
 146         net_init_domain(dp);
 147 }
 148
 149 /* ARGSUSED*/
 150 static void
 151 domaininit(void *dummy)
 152 {
 153         if (max_linkhdr < 20)           /* XXX */
 154                 max_linkhdr = 20;
 155
 156         callout_init_mp(&pffasttimo_ch);
 157         callout_init_mp(&pfslowtimo_ch);
 158         callout_reset(&pffasttimo_ch, 1, pffasttimo, NULL);
 159         callout_reset(&pfslowtimo_ch, 1, pfslowtimo, NULL);
 160 }
 161
 162
 163 struct protosw *
 164 pffindtype(int family, int type)
 165 {
 166         struct domain *dp;
 167         struct protosw *pr;
 168
 169         SLIST_FOREACH(dp, &domains, dom_next)
 170                 if (dp->dom_family == family)
 171                         goto found;
 172         return (NULL);
 173
 174 found:
 175         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 176                 if (pr->pr_type && pr->pr_type == type)
 177                         return (pr);
 178         return (NULL);
 179 }
 180
 181 struct protosw *
 182 pffindproto(int family, int protocol, int type)
 183 {
 184         struct domain *dp;
 185         struct protosw *pr;
 186         struct protosw *maybe = NULL;
 187
 188         if (family == 0)
 189                 return (NULL);
 190         SLIST_FOREACH(dp, &domains, dom_next)
 191                 if (dp->dom_family == family)
 192                         goto found;
 193         return (NULL);
 194
 195 found:
 196         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
 197                 if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
 198                         return (pr);
 199
 200                 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
 201                     pr->pr_protocol == 0 && maybe == NULL)
 202                         maybe = pr;
 203         }
 204         return (maybe);
 205 }
 206
 207 void
 208 kpfctlinput(int cmd, struct sockaddr *sa)
 209 {
 210         struct domain *dp;
 211         struct protosw *pr;
 212
 213         SLIST_FOREACH(dp, &domains, dom_next) {
 214                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 215                         so_pr_ctlinput(pr, cmd, sa, NULL);
 216         }
 217 }
 218
 219 void
 220 kpfctlinput_direct(int cmd, struct sockaddr *sa)
 221 {
 222         struct domain *dp;
 223         struct protosw *pr;
 224
 225         SLIST_FOREACH(dp, &domains, dom_next) {
 226                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 227                         so_pr_ctlinput_direct(pr, cmd, sa, NULL);
 228         }
 229 }
 230
 231 void
 232 kpfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam)
 233 {
 234         struct domain *dp;
 235         struct protosw *pr;
 236
 237         if (!sa)
 238                 return;
 239         SLIST_FOREACH(dp, &domains, dom_next) {
 240                 /*
 241                  * the check must be made by xx_ctlinput() anyways, to
 242                  * make sure we use data item pointed to by ctlparam in
 243                  * correct way.  the following check is made just for safety.
 244                  */
 245                 if (dp->dom_family != sa->sa_family)
 246                         continue;
 247
 248                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 249                         so_pr_ctlinput(pr, cmd, sa, ctlparam);
 250         }
 251 }
 252
 253 static void
 254 pfslowtimo(void *arg)
 255 {
 256         struct domain *dp;
 257         struct protosw *pr;
 258
 259         SLIST_FOREACH(dp, &domains, dom_next) {
 260                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 261                         if (pr->pr_slowtimo)
 262                                 (*pr->pr_slowtimo)();
 263         }
 264         callout_reset(&pfslowtimo_ch, hz / 2, pfslowtimo, NULL);
 265 }
 266
 267 static void
 268 pffasttimo(void *arg)
 269 {
 270         struct domain *dp;
 271         struct protosw *pr;
 272
 273         SLIST_FOREACH(dp, &domains, dom_next) {
 274                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 275                         if (pr->pr_fasttimo)
 276                                 (*pr->pr_fasttimo)();
 277         }
 278         callout_reset(&pffasttimo_ch, hz / 5, pffasttimo, NULL);
 279 }