efe58855f3
Combined changes to allow experimentation with net 0/8 (network 0),
240/4 (Experimental/"Class E"), and part of the loopback net 127/8
(all but 127.0/16). All changes are disabled by default, and can be
enabled by the following sysctls:
net.inet.ip.allow_net0=1
net.inet.ip.allow_net240=1
net.inet.ip.loopback_prefixlen=16
When enabled, the corresponding addresses can be used as normal
unicast IP addresses, both as endpoints and when forwarding.
Add descriptions of the new sysctls to inet.4.
Add <machine/param.h> to vnet.h, as CACHE_LINE_SIZE is undefined in
various C files when in.h includes vnet.h.
The proposals motivating this experimentation can be found in
https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-0
https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-240
https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-127
Reviewed by: rgrimes, pauamma_gundo.com; previous versions melifaro, glebius
Differential Revision: https://reviews.freebsd.org/D35741
464 lines
15 KiB
C
464 lines
15 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2006-2009 University of Zagreb
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* Copyright (c) 2006-2009 FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by the University of Zagreb and the
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* FreeBSD Foundation under sponsorship by the Stichting NLnet and the
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* FreeBSD Foundation.
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*
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* Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
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* Copyright (c) 2009 Robert N. M. Watson
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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/*-
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* This header file defines several sets of interfaces supporting virtualized
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* network stacks:
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*
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* - Definition of 'struct vnet' and functions and macros to allocate/free/
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* manipulate it.
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*
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* - A virtual network stack memory allocator, which provides support for
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* virtualized global variables via a special linker set, set_vnet.
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*
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* - Virtualized sysinits/sysuninits, which allow constructors and
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* destructors to be run for each network stack subsystem as virtual
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* instances are created and destroyed.
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*
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* If VIMAGE isn't compiled into the kernel, virtualized global variables
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* compile to normal global variables, and virtualized sysinits to regular
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* sysinits.
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*/
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#ifndef _NET_VNET_H_
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#define _NET_VNET_H_
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/*
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* struct vnet describes a virtualized network stack, and is primarily a
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* pointer to storage for virtualized global variables. Expose to userspace
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* as required for libkvm.
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*/
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#if defined(_KERNEL) || defined(_WANT_VNET)
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#include <machine/param.h> /* for CACHE_LINE_SIZE */
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#include <sys/queue.h>
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struct vnet {
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LIST_ENTRY(vnet) vnet_le; /* all vnets list */
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u_int vnet_magic_n;
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u_int vnet_ifcnt;
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u_int vnet_sockcnt;
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u_int vnet_state; /* SI_SUB_* */
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void *vnet_data_mem;
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uintptr_t vnet_data_base;
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bool vnet_shutdown; /* Shutdown in progress. */
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} __aligned(CACHE_LINE_SIZE);
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#define VNET_MAGIC_N 0x5e4a6f28
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/*
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* These two virtual network stack allocator definitions are also required
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* for libkvm so that it can evaluate virtualized global variables.
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*/
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#define VNET_SETNAME "set_vnet"
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#define VNET_SYMPREFIX "vnet_entry_"
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#endif
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#ifdef _KERNEL
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#define VNET_PCPUSTAT_DECLARE(type, name) \
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VNET_DECLARE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
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#define VNET_PCPUSTAT_DEFINE(type, name) \
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VNET_DEFINE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
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#define VNET_PCPUSTAT_DEFINE_STATIC(type, name) \
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VNET_DEFINE_STATIC(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
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#define VNET_PCPUSTAT_ALLOC(name, wait) \
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COUNTER_ARRAY_ALLOC(VNET(name), \
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sizeof(VNET(name)) / sizeof(counter_u64_t), (wait))
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#define VNET_PCPUSTAT_FREE(name) \
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COUNTER_ARRAY_FREE(VNET(name), sizeof(VNET(name)) / sizeof(counter_u64_t))
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#define VNET_PCPUSTAT_ADD(type, name, f, v) \
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counter_u64_add(VNET(name)[offsetof(type, f) / sizeof(uint64_t)], (v))
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#define VNET_PCPUSTAT_FETCH(type, name, f) \
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counter_u64_fetch(VNET(name)[offsetof(type, f) / sizeof(uint64_t)])
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#define VNET_PCPUSTAT_SYSINIT(name) \
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static void \
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vnet_##name##_init(const void *unused) \
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{ \
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VNET_PCPUSTAT_ALLOC(name, M_WAITOK); \
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} \
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VNET_SYSINIT(vnet_ ## name ## _init, SI_SUB_INIT_IF, \
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SI_ORDER_FIRST, vnet_ ## name ## _init, NULL)
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#define VNET_PCPUSTAT_SYSUNINIT(name) \
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static void \
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vnet_##name##_uninit(const void *unused) \
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{ \
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VNET_PCPUSTAT_FREE(name); \
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} \
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VNET_SYSUNINIT(vnet_ ## name ## _uninit, SI_SUB_INIT_IF, \
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SI_ORDER_FIRST, vnet_ ## name ## _uninit, NULL)
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#ifdef SYSCTL_OID
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#define SYSCTL_VNET_PCPUSTAT(parent, nbr, name, type, array, desc) \
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static int \
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array##_sysctl(SYSCTL_HANDLER_ARGS) \
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{ \
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type s; \
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CTASSERT((sizeof(type) / sizeof(uint64_t)) == \
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(sizeof(VNET(array)) / sizeof(counter_u64_t))); \
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COUNTER_ARRAY_COPY(VNET(array), &s, sizeof(type) / sizeof(uint64_t));\
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if (req->newptr) \
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COUNTER_ARRAY_ZERO(VNET(array), \
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sizeof(type) / sizeof(uint64_t)); \
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return (SYSCTL_OUT(req, &s, sizeof(type))); \
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} \
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SYSCTL_PROC(parent, nbr, name, \
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CTLFLAG_VNET | CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT, \
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NULL, 0, array ## _sysctl, "I", desc)
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#endif /* SYSCTL_OID */
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#ifdef VIMAGE
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#include <sys/lock.h>
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#include <sys/proc.h> /* for struct thread */
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#include <sys/rwlock.h>
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#include <sys/sx.h>
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/*
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* Location of the kernel's 'set_vnet' linker set.
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*/
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extern uintptr_t *__start_set_vnet;
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__GLOBL(__start_set_vnet);
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extern uintptr_t *__stop_set_vnet;
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__GLOBL(__stop_set_vnet);
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#define VNET_START (uintptr_t)&__start_set_vnet
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#define VNET_STOP (uintptr_t)&__stop_set_vnet
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/*
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* Functions to allocate and destroy virtual network stacks.
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*/
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struct vnet *vnet_alloc(void);
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void vnet_destroy(struct vnet *vnet);
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/*
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* The current virtual network stack -- we may wish to move this to struct
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* pcpu in the future.
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*/
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#define curvnet curthread->td_vnet
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/*
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* Various macros -- get and set the current network stack, but also
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* assertions.
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*/
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#if defined(INVARIANTS) || defined(VNET_DEBUG)
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#define VNET_ASSERT(exp, msg) do { \
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if (!(exp)) \
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panic msg; \
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} while (0)
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#else
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#define VNET_ASSERT(exp, msg) do { \
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} while (0)
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#endif
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#ifdef VNET_DEBUG
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void vnet_log_recursion(struct vnet *, const char *, int);
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#define CURVNET_SET_QUIET(arg) \
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VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
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("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \
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__FILE__, __LINE__, __func__, curvnet, (arg))); \
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struct vnet *saved_vnet = curvnet; \
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const char *saved_vnet_lpush = curthread->td_vnet_lpush; \
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curvnet = arg; \
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curthread->td_vnet_lpush = __func__;
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#define CURVNET_SET_VERBOSE(arg) \
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CURVNET_SET_QUIET(arg) \
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if (saved_vnet) \
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vnet_log_recursion(saved_vnet, saved_vnet_lpush, __LINE__);
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#define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg)
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#define CURVNET_RESTORE() \
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VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \
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saved_vnet->vnet_magic_n == VNET_MAGIC_N), \
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("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \
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__FILE__, __LINE__, __func__, curvnet, saved_vnet)); \
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curvnet = saved_vnet; \
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curthread->td_vnet_lpush = saved_vnet_lpush;
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#else /* !VNET_DEBUG */
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#define CURVNET_SET_QUIET(arg) \
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VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
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("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \
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__FILE__, __LINE__, __func__, curvnet, (arg))); \
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struct vnet *saved_vnet = curvnet; \
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curvnet = arg;
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#define CURVNET_SET_VERBOSE(arg) \
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CURVNET_SET_QUIET(arg)
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#define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg)
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#define CURVNET_RESTORE() \
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VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \
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saved_vnet->vnet_magic_n == VNET_MAGIC_N), \
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("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \
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__FILE__, __LINE__, __func__, curvnet, saved_vnet)); \
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curvnet = saved_vnet;
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#endif /* VNET_DEBUG */
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#define CURVNET_ASSERT_SET() \
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VNET_ASSERT(curvnet != NULL, ("vnet is not set at %s:%d %s()", \
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__FILE__, __LINE__, __func__))
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extern struct vnet *vnet0;
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#define IS_DEFAULT_VNET(arg) ((arg) == vnet0)
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#define CRED_TO_VNET(cr) (cr)->cr_prison->pr_vnet
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#define TD_TO_VNET(td) CRED_TO_VNET((td)->td_ucred)
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#define P_TO_VNET(p) CRED_TO_VNET((p)->p_ucred)
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/*
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* Global linked list of all virtual network stacks, along with read locks to
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* access it. If a caller may sleep while accessing the list, it must use
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* the sleepable lock macros.
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*/
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LIST_HEAD(vnet_list_head, vnet);
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extern struct vnet_list_head vnet_head;
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extern struct rwlock vnet_rwlock;
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extern struct sx vnet_sxlock;
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#define VNET_LIST_RLOCK() sx_slock(&vnet_sxlock)
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#define VNET_LIST_RLOCK_NOSLEEP() rw_rlock(&vnet_rwlock)
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#define VNET_LIST_RUNLOCK() sx_sunlock(&vnet_sxlock)
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#define VNET_LIST_RUNLOCK_NOSLEEP() rw_runlock(&vnet_rwlock)
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/*
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* Iteration macros to walk the global list of virtual network stacks.
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*/
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#define VNET_ITERATOR_DECL(arg) struct vnet *arg
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#define VNET_FOREACH(arg) LIST_FOREACH((arg), &vnet_head, vnet_le)
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/*
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* Virtual network stack memory allocator, which allows global variables to
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* be automatically instantiated for each network stack instance.
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*/
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#define VNET_NAME(n) vnet_entry_##n
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#define VNET_DECLARE(t, n) extern t VNET_NAME(n)
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/* struct _hack is to stop this from being used with static data */
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#define VNET_DEFINE(t, n) \
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struct _hack; t VNET_NAME(n) __section(VNET_SETNAME) __used
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#if defined(KLD_MODULE) && (defined(__aarch64__) || defined(__riscv) \
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|| defined(__powerpc64__))
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/*
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* As with DPCPU_DEFINE_STATIC we are unable to mark this data as static
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* in modules on some architectures.
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*/
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#define VNET_DEFINE_STATIC(t, n) \
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t VNET_NAME(n) __section(VNET_SETNAME) __used
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#else
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#define VNET_DEFINE_STATIC(t, n) \
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static t VNET_NAME(n) __section(VNET_SETNAME) __used
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#endif
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#define _VNET_PTR(b, n) (__typeof(VNET_NAME(n))*) \
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((b) + (uintptr_t)&VNET_NAME(n))
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#define _VNET(b, n) (*_VNET_PTR(b, n))
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/*
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* Virtualized global variable accessor macros.
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*/
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#define VNET_VNET_PTR(vnet, n) _VNET_PTR((vnet)->vnet_data_base, n)
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#define VNET_VNET(vnet, n) (*VNET_VNET_PTR((vnet), n))
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#define VNET_PTR(n) VNET_VNET_PTR(curvnet, n)
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#define VNET(n) VNET_VNET(curvnet, n)
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/*
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* Virtual network stack allocator interfaces from the kernel linker.
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*/
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void *vnet_data_alloc(int size);
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void vnet_data_copy(void *start, int size);
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void vnet_data_free(void *start_arg, int size);
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/*
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* Virtual sysinit mechanism, allowing network stack components to declare
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* startup and shutdown methods to be run when virtual network stack
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* instances are created and destroyed.
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*/
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#include <sys/kernel.h>
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/*
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* SYSINIT/SYSUNINIT variants that provide per-vnet constructors and
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* destructors.
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*/
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struct vnet_sysinit {
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enum sysinit_sub_id subsystem;
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enum sysinit_elem_order order;
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sysinit_cfunc_t func;
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const void *arg;
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TAILQ_ENTRY(vnet_sysinit) link;
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};
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#define VNET_SYSINIT(ident, subsystem, order, func, arg) \
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CTASSERT((subsystem) > SI_SUB_VNET && \
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(subsystem) <= SI_SUB_VNET_DONE); \
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static struct vnet_sysinit ident ## _vnet_init = { \
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subsystem, \
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order, \
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(sysinit_cfunc_t)(sysinit_nfunc_t)func, \
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(arg) \
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}; \
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SYSINIT(vnet_init_ ## ident, subsystem, order, \
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vnet_register_sysinit, &ident ## _vnet_init); \
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SYSUNINIT(vnet_init_ ## ident, subsystem, order, \
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vnet_deregister_sysinit, &ident ## _vnet_init)
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#define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
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CTASSERT((subsystem) > SI_SUB_VNET && \
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(subsystem) <= SI_SUB_VNET_DONE); \
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static struct vnet_sysinit ident ## _vnet_uninit = { \
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subsystem, \
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order, \
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(sysinit_cfunc_t)(sysinit_nfunc_t)func, \
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(arg) \
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}; \
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SYSINIT(vnet_uninit_ ## ident, subsystem, order, \
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vnet_register_sysuninit, &ident ## _vnet_uninit); \
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SYSUNINIT(vnet_uninit_ ## ident, subsystem, order, \
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vnet_deregister_sysuninit, &ident ## _vnet_uninit)
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/*
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* Run per-vnet sysinits or sysuninits during vnet creation/destruction.
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*/
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void vnet_sysinit(void);
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void vnet_sysuninit(void);
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/*
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* Interfaces for managing per-vnet constructors and destructors.
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*/
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void vnet_register_sysinit(void *arg);
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void vnet_register_sysuninit(void *arg);
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void vnet_deregister_sysinit(void *arg);
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void vnet_deregister_sysuninit(void *arg);
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/*
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* EVENTHANDLER(9) extensions.
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*/
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#include <sys/eventhandler.h>
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void vnet_global_eventhandler_iterator_func(void *, ...);
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#define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
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do { \
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if (IS_DEFAULT_VNET(curvnet)) { \
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(tag) = vimage_eventhandler_register(NULL, #name, func, \
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arg, priority, \
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vnet_global_eventhandler_iterator_func); \
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} \
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} while(0)
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#define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \
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do { \
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if (IS_DEFAULT_VNET(curvnet)) { \
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vimage_eventhandler_register(NULL, #name, func, \
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arg, priority, \
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vnet_global_eventhandler_iterator_func); \
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} \
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} while(0)
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#else /* !VIMAGE */
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/*
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* Various virtual network stack macros compile to no-ops without VIMAGE.
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*/
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#define curvnet NULL
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#define VNET_ASSERT(exp, msg)
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#define CURVNET_SET(arg)
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#define CURVNET_SET_QUIET(arg)
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#define CURVNET_RESTORE()
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#define CURVNET_ASSERT_SET() \
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#define VNET_LIST_RLOCK()
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#define VNET_LIST_RLOCK_NOSLEEP()
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#define VNET_LIST_RUNLOCK()
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#define VNET_LIST_RUNLOCK_NOSLEEP()
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#define VNET_ITERATOR_DECL(arg)
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#define VNET_FOREACH(arg) for (int _vn = 0; _vn == 0; _vn++)
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#define IS_DEFAULT_VNET(arg) 1
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#define CRED_TO_VNET(cr) NULL
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#define TD_TO_VNET(td) NULL
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#define P_TO_VNET(p) NULL
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/*
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* Versions of the VNET macros that compile to normal global variables and
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* standard sysctl definitions.
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*/
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#define VNET_NAME(n) n
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#define VNET_DECLARE(t, n) extern t n
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#define VNET_DEFINE(t, n) struct _hack; t n
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#define VNET_DEFINE_STATIC(t, n) static t n
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#define _VNET_PTR(b, n) &VNET_NAME(n)
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/*
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* Virtualized global variable accessor macros.
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*/
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#define VNET_VNET_PTR(vnet, n) (&(n))
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#define VNET_VNET(vnet, n) (n)
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#define VNET_PTR(n) (&(n))
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#define VNET(n) (n)
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/*
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* When VIMAGE isn't compiled into the kernel, VNET_SYSINIT/VNET_SYSUNINIT
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* map into normal sysinits, which have the same ordering properties.
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*/
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#define VNET_SYSINIT(ident, subsystem, order, func, arg) \
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SYSINIT(ident, subsystem, order, func, arg)
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#define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
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SYSUNINIT(ident, subsystem, order, func, arg)
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/*
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* Without VIMAGE revert to the default implementation.
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*/
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#define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
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(tag) = eventhandler_register(NULL, #name, func, arg, priority)
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#define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \
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eventhandler_register(NULL, #name, func, arg, priority)
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#endif /* VIMAGE */
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#endif /* _KERNEL */
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#endif /* !_NET_VNET_H_ */
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