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)
477 lines
11 KiB
C
477 lines
11 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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* @(#)if_loop.c 8.2 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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/*
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* Loopback interface driver for protocol testing and timing.
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*/
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#include "opt_atalk.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipx.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.h>
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#include <sys/vimage.h>
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#include <net/if.h>
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#include <net/if_clone.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/bpf.h>
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#include <net/vnet.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#endif
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#ifdef IPX
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#include <netipx/ipx.h>
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#include <netipx/ipx_if.h>
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#endif
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#ifdef INET6
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#ifndef INET
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#include <netinet/in.h>
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#endif
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#endif
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#ifdef NETATALK
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#include <netatalk/at.h>
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#include <netatalk/at_var.h>
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#endif
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#include <security/mac/mac_framework.h>
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#ifdef TINY_LOMTU
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#define LOMTU (1024+512)
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#elif defined(LARGE_LOMTU)
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#define LOMTU 131072
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#else
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#define LOMTU 16384
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#endif
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#define LO_CSUM_FEATURES (CSUM_IP | CSUM_TCP | CSUM_UDP | CSUM_SCTP)
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#define LO_CSUM_SET (CSUM_DATA_VALID | CSUM_PSEUDO_HDR | \
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CSUM_IP_CHECKED | CSUM_IP_VALID | \
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CSUM_SCTP_VALID)
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int loioctl(struct ifnet *, u_long, caddr_t);
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static void lortrequest(int, struct rtentry *, struct rt_addrinfo *);
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int looutput(struct ifnet *ifp, struct mbuf *m,
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struct sockaddr *dst, struct route *ro);
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static int lo_clone_create(struct if_clone *, int, caddr_t);
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static void lo_clone_destroy(struct ifnet *);
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static int vnet_loif_iattach(const void *);
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#ifdef VIMAGE
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static int vnet_loif_idetach(const void *);
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#endif
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VNET_DEFINE(struct ifnet *, loif); /* Used externally */
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#ifdef VIMAGE
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static VNET_DEFINE(struct ifc_simple_data *, lo_cloner_data);
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static VNET_DEFINE(struct if_clone *, lo_cloner);
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#define V_lo_cloner_data VNET_GET(lo_cloner_data)
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#define V_lo_cloner VNET_GET(lo_cloner)
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MALLOC_DEFINE(M_LO_CLONER, "lo_cloner", "lo_cloner");
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#endif
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#ifdef VIMAGE
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static const vnet_modinfo_t vnet_loif_modinfo = {
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.vmi_id = VNET_MOD_LOIF,
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.vmi_dependson = VNET_MOD_IF_CLONE,
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.vmi_name = "loif",
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.vmi_iattach = vnet_loif_iattach,
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.vmi_idetach = vnet_loif_idetach
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};
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#endif
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IFC_SIMPLE_DECLARE(lo, 1);
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static void
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lo_clone_destroy(struct ifnet *ifp)
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{
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#ifndef VIMAGE
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/* XXX: destroying lo0 will lead to panics. */
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KASSERT(V_loif != ifp, ("%s: destroying lo0", __func__));
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#endif
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bpfdetach(ifp);
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if_detach(ifp);
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if_free(ifp);
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}
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static int
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lo_clone_create(struct if_clone *ifc, int unit, caddr_t params)
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{
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struct ifnet *ifp;
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ifp = if_alloc(IFT_LOOP);
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if (ifp == NULL)
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return (ENOSPC);
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if_initname(ifp, ifc->ifc_name, unit);
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ifp->if_mtu = LOMTU;
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ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
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ifp->if_ioctl = loioctl;
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ifp->if_output = looutput;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_capabilities = ifp->if_capenable = IFCAP_HWCSUM;
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ifp->if_hwassist = LO_CSUM_FEATURES;
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if_attach(ifp);
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bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
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if (V_loif == NULL)
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V_loif = ifp;
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return (0);
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}
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static int
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vnet_loif_iattach(const void *unused __unused)
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{
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#ifdef VIMAGE
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V_lo_cloner = malloc(sizeof(*V_lo_cloner), M_LO_CLONER,
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M_WAITOK | M_ZERO);
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V_lo_cloner_data = malloc(sizeof(*V_lo_cloner_data), M_LO_CLONER,
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M_WAITOK | M_ZERO);
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bcopy(&lo_cloner, V_lo_cloner, sizeof(*V_lo_cloner));
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bcopy(lo_cloner.ifc_data, V_lo_cloner_data, sizeof(*V_lo_cloner_data));
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V_lo_cloner->ifc_data = V_lo_cloner_data;
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if_clone_attach(V_lo_cloner);
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#else
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if_clone_attach(&lo_cloner);
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#endif
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return (0);
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}
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#ifdef VIMAGE
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static int
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vnet_loif_idetach(const void *unused __unused)
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{
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if_clone_detach(V_lo_cloner);
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free(V_lo_cloner, M_LO_CLONER);
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free(V_lo_cloner_data, M_LO_CLONER);
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V_loif = NULL;
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return (0);
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}
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#endif
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static int
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loop_modevent(module_t mod, int type, void *data)
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{
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switch (type) {
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case MOD_LOAD:
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#ifdef VIMAGE
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vnet_mod_register(&vnet_loif_modinfo);
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#else
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vnet_loif_iattach(NULL);
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#endif
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break;
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case MOD_UNLOAD:
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printf("loop module unload - not possible for this module type\n");
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return (EINVAL);
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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static moduledata_t loop_mod = {
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"loop",
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loop_modevent,
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0
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};
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DECLARE_MODULE(loop, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
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int
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looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
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struct route *ro)
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{
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u_int32_t af;
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struct rtentry *rt = NULL;
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#ifdef MAC
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int error;
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#endif
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M_ASSERTPKTHDR(m); /* check if we have the packet header */
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if (ro != NULL)
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rt = ro->ro_rt;
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#ifdef MAC
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error = mac_ifnet_check_transmit(ifp, m);
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if (error) {
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m_freem(m);
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return (error);
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}
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#endif
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if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
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m_freem(m);
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return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
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rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
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}
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ifp->if_opackets++;
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ifp->if_obytes += m->m_pkthdr.len;
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/* BPF writes need to be handled specially. */
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if (dst->sa_family == AF_UNSPEC) {
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bcopy(dst->sa_data, &af, sizeof(af));
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dst->sa_family = af;
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}
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#if 1 /* XXX */
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switch (dst->sa_family) {
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case AF_INET:
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if (ifp->if_capenable & IFCAP_RXCSUM) {
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m->m_pkthdr.csum_data = 0xffff;
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m->m_pkthdr.csum_flags = LO_CSUM_SET;
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}
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m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES;
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case AF_INET6:
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case AF_IPX:
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case AF_APPLETALK:
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break;
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default:
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printf("looutput: af=%d unexpected\n", dst->sa_family);
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m_freem(m);
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return (EAFNOSUPPORT);
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}
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#endif
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return (if_simloop(ifp, m, dst->sa_family, 0));
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}
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/*
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* if_simloop()
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*
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* This function is to support software emulation of hardware loopback,
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* i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
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* hear their own broadcasts, we create a copy of the packet that we
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* would normally receive via a hardware loopback.
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*
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* This function expects the packet to include the media header of length hlen.
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*/
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int
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if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen)
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{
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int isr;
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M_ASSERTPKTHDR(m);
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m_tag_delete_nonpersistent(m);
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m->m_pkthdr.rcvif = ifp;
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#ifdef MAC
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mac_ifnet_create_mbuf(ifp, m);
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#endif
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/*
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* Let BPF see incoming packet in the following manner:
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* - Emulated packet loopback for a simplex interface
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* (net/if_ethersubr.c)
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* -> passes it to ifp's BPF
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* - IPv4/v6 multicast packet loopback (netinet(6)/ip(6)_output.c)
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* -> not passes it to any BPF
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* - Normal packet loopback from myself to myself (net/if_loop.c)
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* -> passes to lo0's BPF (even in case of IPv6, where ifp!=lo0)
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*/
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if (hlen > 0) {
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if (bpf_peers_present(ifp->if_bpf)) {
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bpf_mtap(ifp->if_bpf, m);
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}
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} else {
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if (bpf_peers_present(V_loif->if_bpf)) {
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if ((m->m_flags & M_MCAST) == 0 || V_loif == ifp) {
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/* XXX beware sizeof(af) != 4 */
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u_int32_t af1 = af;
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/*
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* We need to prepend the address family.
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*/
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bpf_mtap2(V_loif->if_bpf, &af1, sizeof(af1), m);
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}
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}
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}
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/* Strip away media header */
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if (hlen > 0) {
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m_adj(m, hlen);
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#ifndef __NO_STRICT_ALIGNMENT
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/*
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* Some archs do not like unaligned data, so
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* we move data down in the first mbuf.
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*/
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if (mtod(m, vm_offset_t) & 3) {
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KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
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bcopy(m->m_data,
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(char *)(mtod(m, vm_offset_t)
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- (mtod(m, vm_offset_t) & 3)),
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m->m_len);
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m->m_data -= (mtod(m,vm_offset_t) & 3);
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}
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#endif
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}
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/* Deliver to upper layer protocol */
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switch (af) {
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#ifdef INET
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case AF_INET:
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isr = NETISR_IP;
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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m->m_flags |= M_LOOP;
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isr = NETISR_IPV6;
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break;
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#endif
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#ifdef IPX
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case AF_IPX:
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isr = NETISR_IPX;
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break;
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#endif
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#ifdef NETATALK
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case AF_APPLETALK:
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isr = NETISR_ATALK2;
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break;
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#endif
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default:
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printf("if_simloop: can't handle af=%d\n", af);
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m_freem(m);
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return (EAFNOSUPPORT);
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}
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ifp->if_ipackets++;
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ifp->if_ibytes += m->m_pkthdr.len;
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netisr_queue(isr, m); /* mbuf is free'd on failure. */
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return (0);
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}
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/* ARGSUSED */
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static void
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lortrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
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{
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RT_LOCK_ASSERT(rt);
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rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
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}
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/*
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* Process an ioctl request.
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*/
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/* ARGSUSED */
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int
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loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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struct ifaddr *ifa;
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struct ifreq *ifr = (struct ifreq *)data;
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int error = 0, mask;
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switch (cmd) {
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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ifp->if_drv_flags |= IFF_DRV_RUNNING;
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ifa = (struct ifaddr *)data;
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ifa->ifa_rtrequest = lortrequest;
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/*
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* Everything else is done at a higher level.
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*/
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break;
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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if (ifr == 0) {
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error = EAFNOSUPPORT; /* XXX */
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break;
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}
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switch (ifr->ifr_addr.sa_family) {
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#ifdef INET
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case AF_INET:
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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break;
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#endif
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default:
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error = EAFNOSUPPORT;
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break;
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}
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break;
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case SIOCSIFMTU:
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ifp->if_mtu = ifr->ifr_mtu;
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break;
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case SIOCSIFFLAGS:
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break;
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case SIOCSIFCAP:
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mask = ifp->if_capenable ^ ifr->ifr_reqcap;
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if ((mask & IFCAP_RXCSUM) != 0)
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ifp->if_capenable ^= IFCAP_RXCSUM;
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if ((mask & IFCAP_TXCSUM) != 0)
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ifp->if_capenable ^= IFCAP_TXCSUM;
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if (ifp->if_capenable & IFCAP_TXCSUM)
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ifp->if_hwassist = LO_CSUM_FEATURES;
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else
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ifp->if_hwassist = 0;
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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