86c5937532
Similar to arm64, riscv compiler uses PC-relative loads/stores, and with static data compiler does not emit relocations. In result, kernel module linker has nothing to fix and data accessed from the wrong location. Approved by: re (gjb) Sponsored by: DARPA, AFRL
451 lines
14 KiB
C
451 lines
14 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2006-2009 University of Zagreb
|
|
* Copyright (c) 2006-2009 FreeBSD Foundation
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed by the University of Zagreb and the
|
|
* FreeBSD Foundation under sponsorship by the Stichting NLnet and the
|
|
* FreeBSD Foundation.
|
|
*
|
|
* Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
|
|
* Copyright (c) 2009 Robert N. M. Watson
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*-
|
|
* This header file defines several sets of interfaces supporting virtualized
|
|
* network stacks:
|
|
*
|
|
* - Definition of 'struct vnet' and functions and macros to allocate/free/
|
|
* manipulate it.
|
|
*
|
|
* - A virtual network stack memory allocator, which provides support for
|
|
* virtualized global variables via a special linker set, set_vnet.
|
|
*
|
|
* - Virtualized sysinits/sysuninits, which allow constructors and
|
|
* destructors to be run for each network stack subsystem as virtual
|
|
* instances are created and destroyed.
|
|
*
|
|
* If VIMAGE isn't compiled into the kernel, virtualized global variables
|
|
* compile to normal global variables, and virtualized sysinits to regular
|
|
* sysinits.
|
|
*/
|
|
|
|
#ifndef _NET_VNET_H_
|
|
#define _NET_VNET_H_
|
|
|
|
/*
|
|
* struct vnet describes a virtualized network stack, and is primarily a
|
|
* pointer to storage for virtualized global variables. Expose to userspace
|
|
* as required for libkvm.
|
|
*/
|
|
#if defined(_KERNEL) || defined(_WANT_VNET)
|
|
#include <sys/queue.h>
|
|
|
|
struct vnet {
|
|
LIST_ENTRY(vnet) vnet_le; /* all vnets list */
|
|
u_int vnet_magic_n;
|
|
u_int vnet_ifcnt;
|
|
u_int vnet_sockcnt;
|
|
u_int vnet_state; /* SI_SUB_* */
|
|
void *vnet_data_mem;
|
|
uintptr_t vnet_data_base;
|
|
};
|
|
#define VNET_MAGIC_N 0x3e0d8f29
|
|
|
|
/*
|
|
* These two virtual network stack allocator definitions are also required
|
|
* for libkvm so that it can evaluate virtualized global variables.
|
|
*/
|
|
#define VNET_SETNAME "set_vnet"
|
|
#define VNET_SYMPREFIX "vnet_entry_"
|
|
#endif
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#define VNET_PCPUSTAT_DECLARE(type, name) \
|
|
VNET_DECLARE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
|
|
|
|
#define VNET_PCPUSTAT_DEFINE(type, name) \
|
|
VNET_DEFINE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
|
|
#define VNET_PCPUSTAT_DEFINE_STATIC(type, name) \
|
|
VNET_DEFINE_STATIC(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
|
|
|
|
#define VNET_PCPUSTAT_ALLOC(name, wait) \
|
|
COUNTER_ARRAY_ALLOC(VNET(name), \
|
|
sizeof(VNET(name)) / sizeof(counter_u64_t), (wait))
|
|
|
|
#define VNET_PCPUSTAT_FREE(name) \
|
|
COUNTER_ARRAY_FREE(VNET(name), sizeof(VNET(name)) / sizeof(counter_u64_t))
|
|
|
|
#define VNET_PCPUSTAT_ADD(type, name, f, v) \
|
|
counter_u64_add(VNET(name)[offsetof(type, f) / sizeof(uint64_t)], (v))
|
|
|
|
#define VNET_PCPUSTAT_FETCH(type, name, f) \
|
|
counter_u64_fetch(VNET(name)[offsetof(type, f) / sizeof(uint64_t)])
|
|
|
|
#define VNET_PCPUSTAT_SYSINIT(name) \
|
|
static void \
|
|
vnet_##name##_init(const void *unused) \
|
|
{ \
|
|
VNET_PCPUSTAT_ALLOC(name, M_WAITOK); \
|
|
} \
|
|
VNET_SYSINIT(vnet_ ## name ## _init, SI_SUB_INIT_IF, \
|
|
SI_ORDER_FIRST, vnet_ ## name ## _init, NULL)
|
|
|
|
#define VNET_PCPUSTAT_SYSUNINIT(name) \
|
|
static void \
|
|
vnet_##name##_uninit(const void *unused) \
|
|
{ \
|
|
VNET_PCPUSTAT_FREE(name); \
|
|
} \
|
|
VNET_SYSUNINIT(vnet_ ## name ## _uninit, SI_SUB_INIT_IF, \
|
|
SI_ORDER_FIRST, vnet_ ## name ## _uninit, NULL)
|
|
|
|
#ifdef SYSCTL_OID
|
|
#define SYSCTL_VNET_PCPUSTAT(parent, nbr, name, type, array, desc) \
|
|
static int \
|
|
array##_sysctl(SYSCTL_HANDLER_ARGS) \
|
|
{ \
|
|
type s; \
|
|
CTASSERT((sizeof(type) / sizeof(uint64_t)) == \
|
|
(sizeof(VNET(array)) / sizeof(counter_u64_t))); \
|
|
COUNTER_ARRAY_COPY(VNET(array), &s, sizeof(type) / sizeof(uint64_t));\
|
|
if (req->newptr) \
|
|
COUNTER_ARRAY_ZERO(VNET(array), \
|
|
sizeof(type) / sizeof(uint64_t)); \
|
|
return (SYSCTL_OUT(req, &s, sizeof(type))); \
|
|
} \
|
|
SYSCTL_PROC(parent, nbr, name, CTLFLAG_VNET | CTLTYPE_OPAQUE | CTLFLAG_RW, \
|
|
NULL, 0, array ## _sysctl, "I", desc)
|
|
#endif /* SYSCTL_OID */
|
|
|
|
#ifdef VIMAGE
|
|
#include <sys/lock.h>
|
|
#include <sys/proc.h> /* for struct thread */
|
|
#include <sys/rwlock.h>
|
|
#include <sys/sx.h>
|
|
|
|
/*
|
|
* Location of the kernel's 'set_vnet' linker set.
|
|
*/
|
|
extern uintptr_t *__start_set_vnet;
|
|
__GLOBL(__start_set_vnet);
|
|
extern uintptr_t *__stop_set_vnet;
|
|
__GLOBL(__stop_set_vnet);
|
|
|
|
#define VNET_START (uintptr_t)&__start_set_vnet
|
|
#define VNET_STOP (uintptr_t)&__stop_set_vnet
|
|
|
|
/*
|
|
* Functions to allocate and destroy virtual network stacks.
|
|
*/
|
|
struct vnet *vnet_alloc(void);
|
|
void vnet_destroy(struct vnet *vnet);
|
|
|
|
/*
|
|
* The current virtual network stack -- we may wish to move this to struct
|
|
* pcpu in the future.
|
|
*/
|
|
#define curvnet curthread->td_vnet
|
|
|
|
/*
|
|
* Various macros -- get and set the current network stack, but also
|
|
* assertions.
|
|
*/
|
|
#if defined(INVARIANTS) || defined(VNET_DEBUG)
|
|
#define VNET_ASSERT(exp, msg) do { \
|
|
if (!(exp)) \
|
|
panic msg; \
|
|
} while (0)
|
|
#else
|
|
#define VNET_ASSERT(exp, msg) do { \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifdef VNET_DEBUG
|
|
void vnet_log_recursion(struct vnet *, const char *, int);
|
|
|
|
#define CURVNET_SET_QUIET(arg) \
|
|
VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
|
|
("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \
|
|
__FILE__, __LINE__, __func__, curvnet, (arg))); \
|
|
struct vnet *saved_vnet = curvnet; \
|
|
const char *saved_vnet_lpush = curthread->td_vnet_lpush; \
|
|
curvnet = arg; \
|
|
curthread->td_vnet_lpush = __func__;
|
|
|
|
#define CURVNET_SET_VERBOSE(arg) \
|
|
CURVNET_SET_QUIET(arg) \
|
|
if (saved_vnet) \
|
|
vnet_log_recursion(saved_vnet, saved_vnet_lpush, __LINE__);
|
|
|
|
#define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg)
|
|
|
|
#define CURVNET_RESTORE() \
|
|
VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \
|
|
saved_vnet->vnet_magic_n == VNET_MAGIC_N), \
|
|
("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \
|
|
__FILE__, __LINE__, __func__, curvnet, saved_vnet)); \
|
|
curvnet = saved_vnet; \
|
|
curthread->td_vnet_lpush = saved_vnet_lpush;
|
|
#else /* !VNET_DEBUG */
|
|
|
|
#define CURVNET_SET_QUIET(arg) \
|
|
VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
|
|
("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \
|
|
__FILE__, __LINE__, __func__, curvnet, (arg))); \
|
|
struct vnet *saved_vnet = curvnet; \
|
|
curvnet = arg;
|
|
|
|
#define CURVNET_SET_VERBOSE(arg) \
|
|
CURVNET_SET_QUIET(arg)
|
|
|
|
#define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg)
|
|
|
|
#define CURVNET_RESTORE() \
|
|
VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \
|
|
saved_vnet->vnet_magic_n == VNET_MAGIC_N), \
|
|
("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \
|
|
__FILE__, __LINE__, __func__, curvnet, saved_vnet)); \
|
|
curvnet = saved_vnet;
|
|
#endif /* VNET_DEBUG */
|
|
|
|
extern struct vnet *vnet0;
|
|
#define IS_DEFAULT_VNET(arg) ((arg) == vnet0)
|
|
|
|
#define CRED_TO_VNET(cr) (cr)->cr_prison->pr_vnet
|
|
#define TD_TO_VNET(td) CRED_TO_VNET((td)->td_ucred)
|
|
#define P_TO_VNET(p) CRED_TO_VNET((p)->p_ucred)
|
|
|
|
/*
|
|
* Global linked list of all virtual network stacks, along with read locks to
|
|
* access it. If a caller may sleep while accessing the list, it must use
|
|
* the sleepable lock macros.
|
|
*/
|
|
LIST_HEAD(vnet_list_head, vnet);
|
|
extern struct vnet_list_head vnet_head;
|
|
extern struct rwlock vnet_rwlock;
|
|
extern struct sx vnet_sxlock;
|
|
|
|
#define VNET_LIST_RLOCK() sx_slock(&vnet_sxlock)
|
|
#define VNET_LIST_RLOCK_NOSLEEP() rw_rlock(&vnet_rwlock)
|
|
#define VNET_LIST_RUNLOCK() sx_sunlock(&vnet_sxlock)
|
|
#define VNET_LIST_RUNLOCK_NOSLEEP() rw_runlock(&vnet_rwlock)
|
|
|
|
/*
|
|
* Iteration macros to walk the global list of virtual network stacks.
|
|
*/
|
|
#define VNET_ITERATOR_DECL(arg) struct vnet *arg
|
|
#define VNET_FOREACH(arg) LIST_FOREACH((arg), &vnet_head, vnet_le)
|
|
|
|
/*
|
|
* Virtual network stack memory allocator, which allows global variables to
|
|
* be automatically instantiated for each network stack instance.
|
|
*/
|
|
#define VNET_NAME(n) vnet_entry_##n
|
|
#define VNET_DECLARE(t, n) extern t VNET_NAME(n)
|
|
/* struct _hack is to stop this from being used with static data */
|
|
#define VNET_DEFINE(t, n) \
|
|
struct _hack; t VNET_NAME(n) __section(VNET_SETNAME) __used
|
|
#if defined(KLD_MODULE) && (defined(__aarch64__) || defined(__riscv))
|
|
/*
|
|
* As with DPCPU_DEFINE_STATIC we are unable to mark this data as static
|
|
* in modules on some architectures.
|
|
*/
|
|
#define VNET_DEFINE_STATIC(t, n) \
|
|
t VNET_NAME(n) __section(VNET_SETNAME) __used
|
|
#else
|
|
#define VNET_DEFINE_STATIC(t, n) \
|
|
static t VNET_NAME(n) __section(VNET_SETNAME) __used
|
|
#endif
|
|
#define _VNET_PTR(b, n) (__typeof(VNET_NAME(n))*) \
|
|
((b) + (uintptr_t)&VNET_NAME(n))
|
|
|
|
#define _VNET(b, n) (*_VNET_PTR(b, n))
|
|
|
|
/*
|
|
* Virtualized global variable accessor macros.
|
|
*/
|
|
#define VNET_VNET_PTR(vnet, n) _VNET_PTR((vnet)->vnet_data_base, n)
|
|
#define VNET_VNET(vnet, n) (*VNET_VNET_PTR((vnet), n))
|
|
|
|
#define VNET_PTR(n) VNET_VNET_PTR(curvnet, n)
|
|
#define VNET(n) VNET_VNET(curvnet, n)
|
|
|
|
/*
|
|
* Virtual network stack allocator interfaces from the kernel linker.
|
|
*/
|
|
void *vnet_data_alloc(int size);
|
|
void vnet_data_copy(void *start, int size);
|
|
void vnet_data_free(void *start_arg, int size);
|
|
|
|
/*
|
|
* Virtual sysinit mechanism, allowing network stack components to declare
|
|
* startup and shutdown methods to be run when virtual network stack
|
|
* instances are created and destroyed.
|
|
*/
|
|
#include <sys/kernel.h>
|
|
|
|
/*
|
|
* SYSINIT/SYSUNINIT variants that provide per-vnet constructors and
|
|
* destructors.
|
|
*/
|
|
struct vnet_sysinit {
|
|
enum sysinit_sub_id subsystem;
|
|
enum sysinit_elem_order order;
|
|
sysinit_cfunc_t func;
|
|
const void *arg;
|
|
TAILQ_ENTRY(vnet_sysinit) link;
|
|
};
|
|
|
|
#define VNET_SYSINIT(ident, subsystem, order, func, arg) \
|
|
static struct vnet_sysinit ident ## _vnet_init = { \
|
|
subsystem, \
|
|
order, \
|
|
(sysinit_cfunc_t)(sysinit_nfunc_t)func, \
|
|
(arg) \
|
|
}; \
|
|
SYSINIT(vnet_init_ ## ident, subsystem, order, \
|
|
vnet_register_sysinit, &ident ## _vnet_init); \
|
|
SYSUNINIT(vnet_init_ ## ident, subsystem, order, \
|
|
vnet_deregister_sysinit, &ident ## _vnet_init)
|
|
|
|
#define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
|
|
static struct vnet_sysinit ident ## _vnet_uninit = { \
|
|
subsystem, \
|
|
order, \
|
|
(sysinit_cfunc_t)(sysinit_nfunc_t)func, \
|
|
(arg) \
|
|
}; \
|
|
SYSINIT(vnet_uninit_ ## ident, subsystem, order, \
|
|
vnet_register_sysuninit, &ident ## _vnet_uninit); \
|
|
SYSUNINIT(vnet_uninit_ ## ident, subsystem, order, \
|
|
vnet_deregister_sysuninit, &ident ## _vnet_uninit)
|
|
|
|
/*
|
|
* Run per-vnet sysinits or sysuninits during vnet creation/destruction.
|
|
*/
|
|
void vnet_sysinit(void);
|
|
void vnet_sysuninit(void);
|
|
|
|
/*
|
|
* Interfaces for managing per-vnet constructors and destructors.
|
|
*/
|
|
void vnet_register_sysinit(void *arg);
|
|
void vnet_register_sysuninit(void *arg);
|
|
void vnet_deregister_sysinit(void *arg);
|
|
void vnet_deregister_sysuninit(void *arg);
|
|
|
|
/*
|
|
* EVENTHANDLER(9) extensions.
|
|
*/
|
|
#include <sys/eventhandler.h>
|
|
|
|
void vnet_global_eventhandler_iterator_func(void *, ...);
|
|
#define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
|
|
do { \
|
|
if (IS_DEFAULT_VNET(curvnet)) { \
|
|
(tag) = vimage_eventhandler_register(NULL, #name, func, \
|
|
arg, priority, \
|
|
vnet_global_eventhandler_iterator_func); \
|
|
} \
|
|
} while(0)
|
|
#define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \
|
|
do { \
|
|
if (IS_DEFAULT_VNET(curvnet)) { \
|
|
vimage_eventhandler_register(NULL, #name, func, \
|
|
arg, priority, \
|
|
vnet_global_eventhandler_iterator_func); \
|
|
} \
|
|
} while(0)
|
|
|
|
#else /* !VIMAGE */
|
|
|
|
/*
|
|
* Various virtual network stack macros compile to no-ops without VIMAGE.
|
|
*/
|
|
#define curvnet NULL
|
|
|
|
#define VNET_ASSERT(exp, msg)
|
|
#define CURVNET_SET(arg)
|
|
#define CURVNET_SET_QUIET(arg)
|
|
#define CURVNET_RESTORE()
|
|
|
|
#define VNET_LIST_RLOCK()
|
|
#define VNET_LIST_RLOCK_NOSLEEP()
|
|
#define VNET_LIST_RUNLOCK()
|
|
#define VNET_LIST_RUNLOCK_NOSLEEP()
|
|
#define VNET_ITERATOR_DECL(arg)
|
|
#define VNET_FOREACH(arg)
|
|
|
|
#define IS_DEFAULT_VNET(arg) 1
|
|
#define CRED_TO_VNET(cr) NULL
|
|
#define TD_TO_VNET(td) NULL
|
|
#define P_TO_VNET(p) NULL
|
|
|
|
/*
|
|
* Versions of the VNET macros that compile to normal global variables and
|
|
* standard sysctl definitions.
|
|
*/
|
|
#define VNET_NAME(n) n
|
|
#define VNET_DECLARE(t, n) extern t n
|
|
#define VNET_DEFINE(t, n) struct _hack; t n
|
|
#define VNET_DEFINE_STATIC(t, n) static t n
|
|
#define _VNET_PTR(b, n) &VNET_NAME(n)
|
|
|
|
/*
|
|
* Virtualized global variable accessor macros.
|
|
*/
|
|
#define VNET_VNET_PTR(vnet, n) (&(n))
|
|
#define VNET_VNET(vnet, n) (n)
|
|
|
|
#define VNET_PTR(n) (&(n))
|
|
#define VNET(n) (n)
|
|
|
|
/*
|
|
* When VIMAGE isn't compiled into the kernel, VNET_SYSINIT/VNET_SYSUNINIT
|
|
* map into normal sysinits, which have the same ordering properties.
|
|
*/
|
|
#define VNET_SYSINIT(ident, subsystem, order, func, arg) \
|
|
SYSINIT(ident, subsystem, order, func, arg)
|
|
#define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
|
|
SYSUNINIT(ident, subsystem, order, func, arg)
|
|
|
|
/*
|
|
* Without VIMAGE revert to the default implementation.
|
|
*/
|
|
#define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
|
|
(tag) = eventhandler_register(NULL, #name, func, arg, priority)
|
|
#define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \
|
|
eventhandler_register(NULL, #name, func, arg, priority)
|
|
#endif /* VIMAGE */
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_NET_VNET_H_ */
|