1e4ad9ce28
the high kernel calls into a protocol stack to perform requests on the user's behalf. We replace the pr_usrreq() entry in struct protosw with a pointer to a structure containing pointers to functions which implement the various reuqests; each function is declared with the correct type and number of arguments. (This is unlike the current scheme in which a quarter of the requests take arguments of type other than (struct mbuf *) and the difference is papered over with casts.) There are a few benefits to this new scheme: 1) Arguments are passed with their correct types, and null-pointer dummies are no longer necessary. 2) There should be slightly better caching effects from eliminating the prximity to extraneous code and th switch in pr_usrreq(). 3) It becomes much easier to change the types of the arguments to something other than `struct mbuf *' (e.g.,pushing the work of sosend() into the protocol as advocated by Van Jacobson). There is one principal drawback: existing protocol stacks need to be modified. This is alleviated by compatibility code in uipc_socket2.c and uipc_domain.c which emulates the new interface in terms of the old and vice versa. This idea is not original to me. I read about what Jacobson did in one of his papers and have tried to implement the first steps towards something like that here. Much work remains to be done.
239 lines
6.5 KiB
C
239 lines
6.5 KiB
C
/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)uipc_domain.c 8.2 (Berkeley) 10/18/93
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* $Id: uipc_domain.c,v 1.12 1995/12/16 02:13:50 bde Exp $
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/domain.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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/*
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* System initialization
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*
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* Note: domain initialization wants to take place on a per domain basis
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* as a result of traversing a linker set. Most likely, each domain
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* want to call a registration function rather than being handled here
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* in domaininit(). Probably this will look like:
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*
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* SYSINIT(unique, SI_SUB_PROTO_DOMAI, SI_ORDER_ANY, domain_add, xxx)
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*
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* Where 'xxx' is replaced by the address of a parameter struct to be
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* passed to the doamin_add() function.
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*/
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static int x_save_spl; /* used by kludge*/
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static void kludge_splimp __P((void *));
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static void kludge_splx __P((void *));
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static void domaininit __P((void *));
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SYSINIT(splimp, SI_SUB_PROTO_BEGIN, SI_ORDER_FIRST, kludge_splimp, &x_save_spl)
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SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL)
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SYSINIT(splx, SI_SUB_PROTO_END, SI_ORDER_FIRST, kludge_splx, &x_save_spl)
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static void pffasttimo __P((void *));
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static void pfslowtimo __P((void *));
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struct domain *domains;
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#define ADDDOMAIN(x) { \
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__CONCAT(x,domain.dom_next) = domains; \
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domains = &__CONCAT(x,domain); \
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}
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extern struct linker_set domain_set;
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/* ARGSUSED*/
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static void
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domaininit(dummy)
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void *dummy;
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{
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register struct domain *dp, **dpp;
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register struct protosw *pr;
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/*
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* NB - local domain is always present.
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*/
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ADDDOMAIN(local);
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for (dpp = (struct domain **)domain_set.ls_items; *dpp; dpp++) {
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(**dpp).dom_next = domains;
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domains = *dpp;
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}
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/* - not in our sources
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#ifdef ISDN
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ADDDOMAIN(isdn);
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#endif
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*/
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for (dp = domains; dp; dp = dp->dom_next) {
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if (dp->dom_init)
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(*dp->dom_init)();
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++){
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#ifdef PRU_OLDSTYLE
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/* See comments in uipc_socket2.c. */
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if (pr->pr_usrreqs == 0)
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pr->pr_usrreqs = &pru_oldstyle;
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else if(pr->pr_usrreq == 0)
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pr->pr_usrreq = pr_newstyle_usrreq;
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#endif
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if (pr->pr_init)
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(*pr->pr_init)();
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}
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}
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if (max_linkhdr < 16) /* XXX */
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max_linkhdr = 16;
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max_hdr = max_linkhdr + max_protohdr;
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max_datalen = MHLEN - max_hdr;
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timeout(pffasttimo, (void *)0, 1);
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timeout(pfslowtimo, (void *)0, 1);
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}
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/*
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* The following two operations are kludge code. Most likely, they should
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* be done as a "domainpreinit()" for the first function and then rolled
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* in as the last act of "domaininit()" for the second.
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*
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* In point of fact, it is questionable why other initialization prior
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* to this does not also take place at splimp by default.
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*/
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static void
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kludge_splimp(udata)
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void *udata;
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{
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int *savesplp = udata;
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*savesplp = splimp();
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}
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static void
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kludge_splx(udata)
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void *udata;
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{
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int *savesplp = udata;
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splx( *savesplp);
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}
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struct protosw *
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pffindtype(int family, int type)
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{
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register struct domain *dp;
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register struct protosw *pr;
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for (dp = domains; dp; dp = dp->dom_next)
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if (dp->dom_family == family)
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goto found;
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return (0);
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found:
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_type && pr->pr_type == type)
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return (pr);
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return (0);
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}
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struct protosw *
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pffindproto(int family, int protocol, int type)
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{
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register struct domain *dp;
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register struct protosw *pr;
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struct protosw *maybe = 0;
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if (family == 0)
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return (0);
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for (dp = domains; dp; dp = dp->dom_next)
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if (dp->dom_family == family)
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goto found;
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return (0);
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found:
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
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if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
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return (pr);
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if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
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pr->pr_protocol == 0 && maybe == (struct protosw *)0)
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maybe = pr;
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}
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return (maybe);
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}
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void
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pfctlinput(cmd, sa)
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int cmd;
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struct sockaddr *sa;
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{
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register struct domain *dp;
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register struct protosw *pr;
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for (dp = domains; dp; dp = dp->dom_next)
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_ctlinput)
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(*pr->pr_ctlinput)(cmd, sa, (void *)0);
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}
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static void
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pfslowtimo(arg)
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void *arg;
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{
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register struct domain *dp;
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register struct protosw *pr;
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for (dp = domains; dp; dp = dp->dom_next)
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_slowtimo)
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(*pr->pr_slowtimo)();
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timeout(pfslowtimo, (void *)0, hz/2);
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}
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static void
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pffasttimo(arg)
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void *arg;
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{
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register struct domain *dp;
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register struct protosw *pr;
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for (dp = domains; dp; dp = dp->dom_next)
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_fasttimo)
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(*pr->pr_fasttimo)();
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timeout(pffasttimo, (void *)0, hz/5);
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}
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