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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)uipc_domain.c       8.2 (Berkeley) 10/18/93
  34  * $FreeBSD: src/sys/kern/uipc_domain.c,v 1.22.2.1 2001/07/03 11:01:37 ume Exp $
  35  * $DragonFly: src/sys/kern/uipc_domain.c,v 1.11 2008/06/05 18:06:32 swildner Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/socket.h>
  40 #include <sys/protosw.h>
  41 #include <sys/domain.h>
  42 #include <sys/mbuf.h>
  43 #include <sys/kernel.h>
  44 #include <sys/socketvar.h>
  45 #include <sys/systm.h>
  46 #include <vm/vm_zone.h>
  47
  48 #include <sys/thread2.h>
  49
  50 /*
  51  * System initialization
  52  *
  53  * Note: domain initialization wants to take place on a per domain basis
  54  * as a result of traversing a linker set.  Most likely, each domain
  55  * want to call a registration function rather than being handled here
  56  * in domaininit().  Probably this will look like:
  57  *
  58  * SYSINIT(unique, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, domain_add, xxx)
  59  *
  60  * Where 'xxx' is replaced by the address of a parameter struct to be
  61  * passed to the doamin_add() function.
  62  */
  63
  64 static void domaininit (void *);
  65 SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL)
  66
  67 static void     pffasttimo (void *);
  68 static void     pfslowtimo (void *);
  69
  70 struct domainlist domains;
  71
  72 static struct callout pffasttimo_ch;
  73 static struct callout pfslowtimo_ch;
  74
  75 /*
  76  * Add a new protocol domain to the list of supported domains
  77  * Note: you cant unload it again because a socket may be using it.
  78  * XXX can't fail at this time.
  79  */
  80 static void
  81 net_init_domain(struct domain *dp)
  82 {
  83         struct protosw *pr;
  84
  85         crit_enter();
  86         if (dp->dom_init)
  87                 (*dp->dom_init)();
  88         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
  89                 if (pr->pr_usrreqs == NULL)
  90                         panic("domaininit: %ssw[%d] has no usrreqs!",
  91                               dp->dom_name, pr - dp->dom_protosw);
  92                 if (pr->pr_init)
  93                         (*pr->pr_init)();
  94         }
  95         /*
  96          * update global information about maximums
  97          */
  98         max_hdr = max_linkhdr + max_protohdr;
  99         max_datalen = MHLEN - max_hdr;
 100         crit_exit();
 101 }
 102
 103 /*
 104  * Add a new protocol domain to the list of supported domains
 105  * Note: you cant unload it again because a socket may be using it.
 106  * XXX can't fail at this time.
 107  */
 108 void
 109 net_add_domain(void *data)
 110 {
 111         struct domain *dp = data;
 112
 113         crit_enter();
 114         SLIST_INSERT_HEAD(&domains, dp, dom_next);
 115         crit_exit();
 116         net_init_domain(dp);
 117 }
 118
 119 /* ARGSUSED*/
 120 static void
 121 domaininit(void *dummy)
 122 {
 123         /*
 124          * Before we do any setup, make sure to initialize the
 125          * zone allocator we get struct sockets from.  The obvious
 126          * maximum number of sockets is `maxfiles', but it is possible
 127          * to have a socket without an open file (e.g., a connection waiting
 128          * to be accept(2)ed).  Rather than think up and define a
 129          * better value, we just use nmbclusters, since that's what people
 130          * are told to increase first when the network runs out of memory.
 131          * Perhaps we should have two pools, one of unlimited size
 132          * for use during socreate(), and one ZONE_INTERRUPT pool for
 133          * use in sonewconn().
 134          */
 135         socket_zone = zinit("socket", sizeof(struct socket), maxsockets,
 136                             ZONE_INTERRUPT, 0);
 137
 138         if (max_linkhdr < 16)           /* XXX */
 139                 max_linkhdr = 16;
 140
 141         callout_init(&pffasttimo_ch);
 142         callout_init(&pfslowtimo_ch);
 143         callout_reset(&pffasttimo_ch, 1, pffasttimo, NULL);
 144         callout_reset(&pfslowtimo_ch, 1, pfslowtimo, NULL);
 145 }
 146
 147
 148 struct protosw *
 149 pffindtype(int family, int type)
 150 {
 151         struct domain *dp;
 152         struct protosw *pr;
 153
 154         SLIST_FOREACH(dp, &domains, dom_next)
 155                 if (dp->dom_family == family)
 156                         goto found;
 157         return (NULL);
 158
 159 found:
 160         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 161                 if (pr->pr_type && pr->pr_type == type)
 162                         return (pr);
 163         return (NULL);
 164 }
 165
 166 struct protosw *
 167 pffindproto(int family, int protocol, int type)
 168 {
 169         struct domain *dp;
 170         struct protosw *pr;
 171         struct protosw *maybe = NULL;
 172
 173         if (family == 0)
 174                 return (NULL);
 175         SLIST_FOREACH(dp, &domains, dom_next)
 176                 if (dp->dom_family == family)
 177                         goto found;
 178         return (NULL);
 179
 180 found:
 181         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
 182                 if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
 183                         return (pr);
 184
 185                 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
 186                     pr->pr_protocol == 0 && maybe == (struct protosw *)NULL)
 187                         maybe = pr;
 188         }
 189         return (maybe);
 190 }
 191
 192 void
 193 kpfctlinput(int cmd, struct sockaddr *sa)
 194 {
 195         struct domain *dp;
 196         struct protosw *pr;
 197
 198         SLIST_FOREACH(dp, &domains, dom_next)
 199                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 200                         if (pr->pr_ctlinput)
 201                                 (*pr->pr_ctlinput)(cmd, sa, NULL);
 202 }
 203
 204 void
 205 kpfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam)
 206 {
 207         struct domain *dp;
 208         struct protosw *pr;
 209
 210         if (!sa)
 211                 return;
 212         SLIST_FOREACH(dp, &domains, dom_next) {
 213                 /*
 214                  * the check must be made by xx_ctlinput() anyways, to
 215                  * make sure we use data item pointed to by ctlparam in
 216                  * correct way.  the following check is made just for safety.
 217                  */
 218                 if (dp->dom_family != sa->sa_family)
 219                         continue;
 220
 221                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 222                         if (pr->pr_ctlinput)
 223                                 (*pr->pr_ctlinput)(cmd, sa, ctlparam);
 224         }
 225 }
 226
 227 static void
 228 pfslowtimo(void *arg)
 229 {
 230         struct domain *dp;
 231         struct protosw *pr;
 232
 233         SLIST_FOREACH(dp, &domains, dom_next)
 234                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 235                         if (pr->pr_slowtimo)
 236                                 (*pr->pr_slowtimo)();
 237         callout_reset(&pfslowtimo_ch, hz / 2, pfslowtimo, NULL);
 238 }
 239
 240 static void
 241 pffasttimo(void *arg)
 242 {
 243         struct domain *dp;
 244         struct protosw *pr;
 245
 246         SLIST_FOREACH(dp, &domains, dom_next)
 247                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 248                         if (pr->pr_fasttimo)
 249                                 (*pr->pr_fasttimo)();
 250         callout_reset(&pffasttimo_ch, hz / 5, pffasttimo, NULL);
 251 }