eddfbb763d
(DPCPU), as suggested by Peter Wemm, and implement a new per-virtual network stack memory allocator. Modify vnet to use the allocator instead of monolithic global container structures (vinet, ...). This change solves many binary compatibility problems associated with VIMAGE, and restores ELF symbols for virtualized global variables. Each virtualized global variable exists as a "reference copy", and also once per virtual network stack. Virtualized global variables are tagged at compile-time, placing the in a special linker set, which is loaded into a contiguous region of kernel memory. Virtualized global variables in the base kernel are linked as normal, but those in modules are copied and relocated to a reserved portion of the kernel's vnet region with the help of a the kernel linker. Virtualized global variables exist in per-vnet memory set up when the network stack instance is created, and are initialized statically from the reference copy. Run-time access occurs via an accessor macro, which converts from the current vnet and requested symbol to a per-vnet address. When "options VIMAGE" is not compiled into the kernel, normal global ELF symbols will be used instead and indirection is avoided. This change restores static initialization for network stack global variables, restores support for non-global symbols and types, eliminates the need for many subsystem constructors, eliminates large per-subsystem structures that caused many binary compatibility issues both for monitoring applications (netstat) and kernel modules, removes the per-function INIT_VNET_*() macros throughout the stack, eliminates the need for vnet_symmap ksym(2) munging, and eliminates duplicate definitions of virtualized globals under VIMAGE_GLOBALS. Bump __FreeBSD_version and update UPDATING. Portions submitted by: bz Reviewed by: bz, zec Discussed with: gnn, jamie, jeff, jhb, julian, sam Suggested by: peter Approved by: re (kensmith)
542 lines
14 KiB
C
542 lines
14 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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* 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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/eventhandler.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/socketvar.h>
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#include <sys/systm.h>
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#include <sys/vimage.h>
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#include <vm/uma.h>
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/*
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* System initialization
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*
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* Note: domain initialization takes place on a per domain basis
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* as a result of traversing a SYSINIT linker set. Most likely,
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* each domain would want to call DOMAIN_SET(9) itself, which
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* would cause the domain to be added just after domaininit()
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* is called during startup.
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*
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* See DOMAIN_SET(9) for details on its use.
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*/
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static void domaininit(void *);
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SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL);
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static void domainfinalize(void *);
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SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize,
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NULL);
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static vnet_attach_fn net_init_domain;
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#ifdef VIMAGE
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static vnet_detach_fn net_detach_domain;
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#endif
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static struct callout pffast_callout;
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static struct callout pfslow_callout;
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static void pffasttimo(void *);
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static void pfslowtimo(void *);
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struct domain *domains; /* registered protocol domains */
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int domain_init_status = 0;
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static struct mtx dom_mtx; /* domain list lock */
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MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);
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/*
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* Dummy protocol specific user requests function pointer array.
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* All functions return EOPNOTSUPP.
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*/
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struct pr_usrreqs nousrreqs = {
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.pru_accept = pru_accept_notsupp,
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.pru_attach = pru_attach_notsupp,
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.pru_bind = pru_bind_notsupp,
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.pru_connect = pru_connect_notsupp,
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.pru_connect2 = pru_connect2_notsupp,
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.pru_control = pru_control_notsupp,
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.pru_disconnect = pru_disconnect_notsupp,
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.pru_listen = pru_listen_notsupp,
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.pru_peeraddr = pru_peeraddr_notsupp,
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.pru_rcvd = pru_rcvd_notsupp,
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.pru_rcvoob = pru_rcvoob_notsupp,
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.pru_send = pru_send_notsupp,
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.pru_sense = pru_sense_null,
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.pru_shutdown = pru_shutdown_notsupp,
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.pru_sockaddr = pru_sockaddr_notsupp,
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.pru_sosend = pru_sosend_notsupp,
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.pru_soreceive = pru_soreceive_notsupp,
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.pru_sopoll = pru_sopoll_notsupp,
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};
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#ifdef VIMAGE
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vnet_modinfo_t vnet_domain_modinfo = {
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.vmi_id = VNET_MOD_DOMAIN,
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.vmi_name = "domain",
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.vmi_iattach = net_init_domain,
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.vmi_idetach = net_detach_domain,
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};
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#endif
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static void
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protosw_init(struct protosw *pr)
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{
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struct pr_usrreqs *pu;
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pu = pr->pr_usrreqs;
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KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!",
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pr->pr_domain->dom_name,
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(int)(pr - pr->pr_domain->dom_protosw)));
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/*
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* Protocol switch methods fall into three categories: mandatory,
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* mandatory but protosw_init() provides a default, and optional.
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*
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* For true protocols (i.e., pru_attach != NULL), KASSERT truly
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* mandatory methods with no defaults, and initialize defaults for
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* other mandatory methods if the protocol hasn't defined an
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* implementation (NULL function pointer).
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*/
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#if 0
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if (pu->pru_attach != NULL) {
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KASSERT(pu->pru_abort != NULL,
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("protosw_init: %ssw[%d] pru_abort NULL",
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pr->pr_domain->dom_name,
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(int)(pr - pr->pr_domain->dom_protosw)));
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KASSERT(pu->pru_send != NULL,
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("protosw_init: %ssw[%d] pru_send NULL",
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pr->pr_domain->dom_name,
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(int)(pr - pr->pr_domain->dom_protosw)));
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}
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#endif
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#define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar)
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DEFAULT(pu->pru_accept, pru_accept_notsupp);
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DEFAULT(pu->pru_bind, pru_bind_notsupp);
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DEFAULT(pu->pru_connect, pru_connect_notsupp);
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DEFAULT(pu->pru_connect2, pru_connect2_notsupp);
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DEFAULT(pu->pru_control, pru_control_notsupp);
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DEFAULT(pu->pru_disconnect, pru_disconnect_notsupp);
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DEFAULT(pu->pru_listen, pru_listen_notsupp);
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DEFAULT(pu->pru_peeraddr, pru_peeraddr_notsupp);
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DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp);
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DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp);
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DEFAULT(pu->pru_sense, pru_sense_null);
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DEFAULT(pu->pru_shutdown, pru_shutdown_notsupp);
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DEFAULT(pu->pru_sockaddr, pru_sockaddr_notsupp);
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DEFAULT(pu->pru_sosend, sosend_generic);
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DEFAULT(pu->pru_soreceive, soreceive_generic);
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DEFAULT(pu->pru_sopoll, sopoll_generic);
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#undef DEFAULT
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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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* Add a new protocol domain to the list of supported domains
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* Note: you cant unload it again because a socket may be using it.
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* XXX can't fail at this time.
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*/
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static int
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net_init_domain(const void *arg)
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{
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const struct domain *dp = arg;
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struct protosw *pr;
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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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protosw_init(pr);
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/*
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* update global information about maximums
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*/
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max_hdr = max_linkhdr + max_protohdr;
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max_datalen = MHLEN - max_hdr;
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if (max_datalen < 1)
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panic("%s: max_datalen < 1", __func__);
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return (0);
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}
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#ifdef VIMAGE
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/*
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* Detach / free a domain instance.
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*/
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static int
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net_detach_domain(const void *arg)
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{
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const struct domain *dp = arg;
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struct protosw *pr;
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
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if (pr->pr_destroy)
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(*pr->pr_destroy)();
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if (dp->dom_destroy)
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(*dp->dom_destroy)();
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return (0);
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}
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#endif
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/*
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* Add a new protocol domain to the list of supported domains
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* Note: you cant unload it again because a socket may be using it.
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* XXX can't fail at this time.
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*/
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void
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net_add_domain(void *data)
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{
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struct domain *dp;
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dp = (struct domain *)data;
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mtx_lock(&dom_mtx);
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dp->dom_next = domains;
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domains = dp;
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KASSERT(domain_init_status >= 1,
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("attempt to net_add_domain(%s) before domaininit()",
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dp->dom_name));
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#ifndef INVARIANTS
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if (domain_init_status < 1)
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printf("WARNING: attempt to net_add_domain(%s) before "
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"domaininit()\n", dp->dom_name);
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#endif
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#ifdef notyet
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KASSERT(domain_init_status < 2,
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("attempt to net_add_domain(%s) after domainfinalize()",
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dp->dom_name));
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#else
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if (domain_init_status >= 2)
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printf("WARNING: attempt to net_add_domain(%s) after "
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"domainfinalize()\n", dp->dom_name);
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#endif
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mtx_unlock(&dom_mtx);
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#ifdef VIMAGE
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vnet_mod_register_multi(&vnet_domain_modinfo, dp, dp->dom_name);
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#else
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net_init_domain(dp);
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#endif
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}
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static void
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socket_zone_change(void *tag)
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{
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uma_zone_set_max(socket_zone, maxsockets);
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}
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/* ARGSUSED*/
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static void
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domaininit(void *dummy)
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{
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/*
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* Before we do any setup, make sure to initialize the
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* zone allocator we get struct sockets from.
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*/
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socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL,
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NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
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uma_zone_set_max(socket_zone, maxsockets);
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EVENTHANDLER_REGISTER(maxsockets_change, socket_zone_change, NULL,
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EVENTHANDLER_PRI_FIRST);
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if (max_linkhdr < 16) /* XXX */
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max_linkhdr = 16;
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callout_init(&pffast_callout, CALLOUT_MPSAFE);
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callout_init(&pfslow_callout, CALLOUT_MPSAFE);
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mtx_lock(&dom_mtx);
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KASSERT(domain_init_status == 0, ("domaininit called too late!"));
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domain_init_status = 1;
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mtx_unlock(&dom_mtx);
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}
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/* ARGSUSED*/
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static void
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domainfinalize(void *dummy)
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{
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mtx_lock(&dom_mtx);
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KASSERT(domain_init_status == 1, ("domainfinalize called too late!"));
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domain_init_status = 2;
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mtx_unlock(&dom_mtx);
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callout_reset(&pffast_callout, 1, pffasttimo, NULL);
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callout_reset(&pfslow_callout, 1, pfslowtimo, NULL);
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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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struct domain *dp;
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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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struct domain *dp;
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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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/*
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* The caller must make sure that the new protocol is fully set up and ready to
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* accept requests before it is registered.
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*/
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int
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pf_proto_register(int family, struct protosw *npr)
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{
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struct domain *dp;
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struct protosw *pr, *fpr;
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/* Sanity checks. */
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if (family == 0)
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return (EPFNOSUPPORT);
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if (npr->pr_type == 0)
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return (EPROTOTYPE);
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if (npr->pr_protocol == 0)
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return (EPROTONOSUPPORT);
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if (npr->pr_usrreqs == NULL)
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return (ENXIO);
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/* Try to find the specified domain based on the family. */
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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 (EPFNOSUPPORT);
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found:
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/* Initialize backpointer to struct domain. */
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npr->pr_domain = dp;
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fpr = NULL;
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/*
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* Protect us against races when two protocol registrations for
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* the same protocol happen at the same time.
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*/
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mtx_lock(&dom_mtx);
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/* The new protocol must not yet exist. */
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
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if ((pr->pr_type == npr->pr_type) &&
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(pr->pr_protocol == npr->pr_protocol)) {
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mtx_unlock(&dom_mtx);
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return (EEXIST); /* XXX: Check only protocol? */
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}
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/* While here, remember the first free spacer. */
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if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER))
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fpr = pr;
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}
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/* If no free spacer is found we can't add the new protocol. */
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if (fpr == NULL) {
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mtx_unlock(&dom_mtx);
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return (ENOMEM);
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}
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/* Copy the new struct protosw over the spacer. */
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bcopy(npr, fpr, sizeof(*fpr));
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/* Job is done, no more protection required. */
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mtx_unlock(&dom_mtx);
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/* Initialize and activate the protocol. */
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protosw_init(fpr);
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return (0);
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}
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/*
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* The caller must make sure the protocol and its functions correctly shut down
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* all sockets and release all locks and memory references.
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*/
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int
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pf_proto_unregister(int family, int protocol, int type)
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{
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struct domain *dp;
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struct protosw *pr, *dpr;
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/* Sanity checks. */
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if (family == 0)
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return (EPFNOSUPPORT);
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if (protocol == 0)
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return (EPROTONOSUPPORT);
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if (type == 0)
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return (EPROTOTYPE);
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/* Try to find the specified domain based on the family type. */
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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 (EPFNOSUPPORT);
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found:
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dpr = NULL;
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/* Lock out everyone else while we are manipulating the protosw. */
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mtx_lock(&dom_mtx);
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/* The protocol must exist and only once. */
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for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
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if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) {
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if (dpr != NULL) {
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mtx_unlock(&dom_mtx);
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return (EMLINK); /* Should not happen! */
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} else
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dpr = pr;
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}
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}
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/* Protocol does not exist. */
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if (dpr == NULL) {
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mtx_unlock(&dom_mtx);
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return (EPROTONOSUPPORT);
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}
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/* De-orbit the protocol and make the slot available again. */
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dpr->pr_type = 0;
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dpr->pr_domain = dp;
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dpr->pr_protocol = PROTO_SPACER;
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dpr->pr_flags = 0;
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dpr->pr_input = NULL;
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dpr->pr_output = NULL;
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dpr->pr_ctlinput = NULL;
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dpr->pr_ctloutput = NULL;
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dpr->pr_init = NULL;
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dpr->pr_fasttimo = NULL;
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dpr->pr_slowtimo = NULL;
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dpr->pr_drain = NULL;
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dpr->pr_usrreqs = &nousrreqs;
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|
|
|
/* Job is done, not more protection required. */
|
|
mtx_unlock(&dom_mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
pfctlinput(int cmd, struct sockaddr *sa)
|
|
{
|
|
struct domain *dp;
|
|
struct protosw *pr;
|
|
|
|
for (dp = domains; dp; dp = dp->dom_next)
|
|
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
|
|
if (pr->pr_ctlinput)
|
|
(*pr->pr_ctlinput)(cmd, sa, (void *)0);
|
|
}
|
|
|
|
void
|
|
pfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam)
|
|
{
|
|
struct domain *dp;
|
|
struct protosw *pr;
|
|
|
|
if (!sa)
|
|
return;
|
|
for (dp = domains; dp; dp = dp->dom_next) {
|
|
/*
|
|
* the check must be made by xx_ctlinput() anyways, to
|
|
* make sure we use data item pointed to by ctlparam in
|
|
* correct way. the following check is made just for safety.
|
|
*/
|
|
if (dp->dom_family != sa->sa_family)
|
|
continue;
|
|
|
|
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
|
|
if (pr->pr_ctlinput)
|
|
(*pr->pr_ctlinput)(cmd, sa, ctlparam);
|
|
}
|
|
}
|
|
|
|
static void
|
|
pfslowtimo(void *arg)
|
|
{
|
|
struct domain *dp;
|
|
struct protosw *pr;
|
|
|
|
for (dp = domains; dp; dp = dp->dom_next)
|
|
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
|
|
if (pr->pr_slowtimo)
|
|
(*pr->pr_slowtimo)();
|
|
callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL);
|
|
}
|
|
|
|
static void
|
|
pffasttimo(void *arg)
|
|
{
|
|
struct domain *dp;
|
|
struct protosw *pr;
|
|
|
|
for (dp = domains; dp; dp = dp->dom_next)
|
|
for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
|
|
if (pr->pr_fasttimo)
|
|
(*pr->pr_fasttimo)();
|
|
callout_reset(&pffast_callout, hz/5, pffasttimo, NULL);
|
|
}
|