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FreeBSD/Linux Kernel Cross Reference
sys/net/vnet.h

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    1 /*-
    2  * Copyright (c) 2006-2009 University of Zagreb
    3  * Copyright (c) 2006-2009 FreeBSD Foundation
    4  * All rights reserved.
    5  *
    6  * This software was developed by the University of Zagreb and the
    7  * FreeBSD Foundation under sponsorship by the Stichting NLnet and the
    8  * FreeBSD Foundation.
    9  *
   10  * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
   11  * Copyright (c) 2009 Robert N. M. Watson
   12  * All rights reserved.
   13  *
   14  * Redistribution and use in source and binary forms, with or without
   15  * modification, are permitted provided that the following conditions
   16  * are met:
   17  * 1. Redistributions of source code must retain the above copyright
   18  *    notice, this list of conditions and the following disclaimer.
   19  * 2. Redistributions in binary form must reproduce the above copyright
   20  *    notice, this list of conditions and the following disclaimer in the
   21  *    documentation and/or other materials provided with the distribution.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  * $FreeBSD: stable/9/sys/net/vnet.h 218567 2011-02-11 14:17:58Z bz $
   36  */
   37 
   38 /*-
   39  * This header file defines several sets of interfaces supporting virtualized
   40  * network stacks:
   41  *
   42  * - Definition of 'struct vnet' and functions and macros to allocate/free/
   43  *   manipulate it.
   44  *
   45  * - A virtual network stack memory allocator, which provides support for
   46  *   virtualized global variables via a special linker set, set_vnet.
   47  *
   48  * - Virtualized sysinits/sysuninits, which allow constructors and
   49  *   destructors to be run for each network stack subsystem as virtual
   50  *   instances are created and destroyed.
   51  *
   52  * If VIMAGE isn't compiled into the kernel, virtualized global variables
   53  * compile to normal global variables, and virtualized sysinits to regular
   54  * sysinits.
   55  */
   56 
   57 #ifndef _NET_VNET_H_
   58 #define _NET_VNET_H_
   59 
   60 /*
   61  * struct vnet describes a virtualized network stack, and is primarily a
   62  * pointer to storage for virtualized global variables.  Expose to userspace
   63  * as required for libkvm.
   64  */
   65 #if defined(_KERNEL) || defined(_WANT_VNET)
   66 #include <sys/queue.h>
   67 
   68 struct vnet {
   69         LIST_ENTRY(vnet)         vnet_le;       /* all vnets list */
   70         u_int                    vnet_magic_n;
   71         u_int                    vnet_ifcnt;
   72         u_int                    vnet_sockcnt;
   73         void                    *vnet_data_mem;
   74         uintptr_t                vnet_data_base;
   75 };
   76 #define VNET_MAGIC_N    0x3e0d8f29
   77 
   78 /*
   79  * These two virtual network stack allocator definitions are also required
   80  * for libkvm so that it can evaluate virtualized global variables.
   81  */
   82 #define VNET_SETNAME            "set_vnet"
   83 #define VNET_SYMPREFIX          "vnet_entry_"
   84 #endif
   85 
   86 #ifdef _KERNEL
   87 
   88 #ifdef VIMAGE
   89 #include <sys/lock.h>
   90 #include <sys/proc.h>                   /* for struct thread */
   91 #include <sys/rwlock.h>
   92 #include <sys/sx.h>
   93 
   94 /*
   95  * Location of the kernel's 'set_vnet' linker set.
   96  */
   97 extern uintptr_t        *__start_set_vnet;
   98 __GLOBL(__start_set_vnet);
   99 extern uintptr_t        *__stop_set_vnet;
  100 __GLOBL(__stop_set_vnet);
  101 
  102 #define VNET_START      (uintptr_t)&__start_set_vnet
  103 #define VNET_STOP       (uintptr_t)&__stop_set_vnet
  104 
  105 /*
  106  * Functions to allocate and destroy virtual network stacks.
  107  */
  108 struct vnet *vnet_alloc(void);
  109 void    vnet_destroy(struct vnet *vnet);
  110 
  111 /*
  112  * The current virtual network stack -- we may wish to move this to struct
  113  * pcpu in the future.
  114  */
  115 #define curvnet curthread->td_vnet
  116 
  117 /*
  118  * Various macros -- get and set the current network stack, but also
  119  * assertions.
  120  */
  121 #if defined(INVARIANTS) || defined(VNET_DEBUG)
  122 #define VNET_ASSERT(exp, msg)   do {                                    \
  123         if (!(exp))                                                     \
  124                 panic msg;                                              \
  125 } while (0)
  126 #else
  127 #define VNET_ASSERT(exp, msg)   do {                                    \
  128 } while (0)
  129 #endif
  130 
  131 #ifdef VNET_DEBUG
  132 void vnet_log_recursion(struct vnet *, const char *, int);
  133 
  134 #define CURVNET_SET_QUIET(arg)                                          \
  135         VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
  136             ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p",            \
  137             __FILE__, __LINE__, __func__, curvnet, (arg)));             \
  138         struct vnet *saved_vnet = curvnet;                              \
  139         const char *saved_vnet_lpush = curthread->td_vnet_lpush;        \
  140         curvnet = arg;                                                  \
  141         curthread->td_vnet_lpush = __func__;
  142  
  143 #define CURVNET_SET_VERBOSE(arg)                                        \
  144         CURVNET_SET_QUIET(arg)                                          \
  145         if (saved_vnet)                                                 \
  146                 vnet_log_recursion(saved_vnet, saved_vnet_lpush, __LINE__);
  147 
  148 #define CURVNET_SET(arg)        CURVNET_SET_VERBOSE(arg)
  149  
  150 #define CURVNET_RESTORE()                                               \
  151         VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL ||           \
  152             saved_vnet->vnet_magic_n == VNET_MAGIC_N),                  \
  153             ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p",  \
  154             __FILE__, __LINE__, __func__, curvnet, saved_vnet));        \
  155         curvnet = saved_vnet;                                           \
  156         curthread->td_vnet_lpush = saved_vnet_lpush;
  157 #else /* !VNET_DEBUG */
  158 
  159 #define CURVNET_SET_QUIET(arg)                                          \
  160         VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
  161             ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p",            \
  162             __FILE__, __LINE__, __func__, curvnet, (arg)));             \
  163         struct vnet *saved_vnet = curvnet;                              \
  164         curvnet = arg;  
  165  
  166 #define CURVNET_SET_VERBOSE(arg)                                        \
  167         CURVNET_SET_QUIET(arg)
  168 
  169 #define CURVNET_SET(arg)        CURVNET_SET_VERBOSE(arg)
  170  
  171 #define CURVNET_RESTORE()                                               \
  172         VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL ||           \
  173             saved_vnet->vnet_magic_n == VNET_MAGIC_N),                  \
  174             ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p",  \
  175             __FILE__, __LINE__, __func__, curvnet, saved_vnet));        \
  176         curvnet = saved_vnet;
  177 #endif /* VNET_DEBUG */
  178 
  179 extern struct vnet *vnet0;
  180 #define IS_DEFAULT_VNET(arg)    ((arg) == vnet0)
  181 
  182 #define CRED_TO_VNET(cr)        (cr)->cr_prison->pr_vnet
  183 #define TD_TO_VNET(td)          CRED_TO_VNET((td)->td_ucred)
  184 #define P_TO_VNET(p)            CRED_TO_VNET((p)->p_ucred)
  185 
  186 /*
  187  * Global linked list of all virtual network stacks, along with read locks to
  188  * access it.  If a caller may sleep while accessing the list, it must use
  189  * the sleepable lock macros.
  190  */
  191 LIST_HEAD(vnet_list_head, vnet);
  192 extern struct vnet_list_head vnet_head;
  193 extern struct rwlock vnet_rwlock;
  194 extern struct sx vnet_sxlock;
  195 
  196 #define VNET_LIST_RLOCK()               sx_slock(&vnet_sxlock)
  197 #define VNET_LIST_RLOCK_NOSLEEP()       rw_rlock(&vnet_rwlock)
  198 #define VNET_LIST_RUNLOCK()             sx_sunlock(&vnet_sxlock)
  199 #define VNET_LIST_RUNLOCK_NOSLEEP()     rw_runlock(&vnet_rwlock)
  200 
  201 /*
  202  * Iteration macros to walk the global list of virtual network stacks.
  203  */
  204 #define VNET_ITERATOR_DECL(arg) struct vnet *arg
  205 #define VNET_FOREACH(arg)       LIST_FOREACH((arg), &vnet_head, vnet_le)
  206 
  207 /*
  208  * Virtual network stack memory allocator, which allows global variables to
  209  * be automatically instantiated for each network stack instance.
  210  */
  211 #define VNET_NAME(n)            vnet_entry_##n
  212 #define VNET_DECLARE(t, n)      extern t VNET_NAME(n)
  213 #define VNET_DEFINE(t, n)       t VNET_NAME(n) __section(VNET_SETNAME) __used
  214 #define _VNET_PTR(b, n)         (__typeof(VNET_NAME(n))*)               \
  215                                     ((b) + (uintptr_t)&VNET_NAME(n))
  216 
  217 #define _VNET(b, n)             (*_VNET_PTR(b, n))
  218 
  219 /*
  220  * Virtualized global variable accessor macros.
  221  */
  222 #define VNET_VNET_PTR(vnet, n)          _VNET_PTR((vnet)->vnet_data_base, n)
  223 #define VNET_VNET(vnet, n)              (*VNET_VNET_PTR((vnet), n))
  224 
  225 #define VNET_PTR(n)             VNET_VNET_PTR(curvnet, n)
  226 #define VNET(n)                 VNET_VNET(curvnet, n)
  227 
  228 /*
  229  * Virtual network stack allocator interfaces from the kernel linker.
  230  */
  231 void    *vnet_data_alloc(int size);
  232 void     vnet_data_copy(void *start, int size);
  233 void     vnet_data_free(void *start_arg, int size);
  234 
  235 /*
  236  * Sysctl variants for vnet-virtualized global variables.  Include
  237  * <sys/sysctl.h> to expose these definitions.
  238  *
  239  * Note: SYSCTL_PROC() handler functions will need to resolve pointer
  240  * arguments themselves, if required.
  241  */
  242 #ifdef SYSCTL_OID
  243 int     vnet_sysctl_handle_int(SYSCTL_HANDLER_ARGS);
  244 int     vnet_sysctl_handle_opaque(SYSCTL_HANDLER_ARGS);
  245 int     vnet_sysctl_handle_string(SYSCTL_HANDLER_ARGS);
  246 int     vnet_sysctl_handle_uint(SYSCTL_HANDLER_ARGS);
  247 
  248 #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr)     \
  249         SYSCTL_OID(parent, nbr, name,                                   \
  250             CTLTYPE_INT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access),           \
  251             ptr, val, vnet_sysctl_handle_int, "I", descr)
  252 #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler,  \
  253             fmt, descr)                                                 \
  254         CTASSERT(((access) & CTLTYPE) != 0);                            \
  255         SYSCTL_OID(parent, nbr, name, CTLFLAG_VNET|(access), ptr, arg,  \
  256             handler, fmt, descr)
  257 #define SYSCTL_VNET_OPAQUE(parent, nbr, name, access, ptr, len, fmt,    \
  258             descr)                                                      \
  259         SYSCTL_OID(parent, nbr, name,                                   \
  260             CTLTYPE_OPAQUE|CTLFLAG_VNET|(access), ptr, len,             \
  261             vnet_sysctl_handle_opaque, fmt, descr)
  262 #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr)  \
  263         SYSCTL_OID(parent, nbr, name,                                   \
  264             CTLTYPE_STRING|CTLFLAG_VNET|(access),                       \
  265             arg, len, vnet_sysctl_handle_string, "A", descr)
  266 #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
  267         SYSCTL_OID(parent, nbr, name,                                   \
  268             CTLTYPE_OPAQUE|CTLFLAG_VNET|(access), ptr,                  \
  269             sizeof(struct type), vnet_sysctl_handle_opaque, "S," #type, \
  270             descr)
  271 #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr)    \
  272         SYSCTL_OID(parent, nbr, name,                                   \
  273             CTLTYPE_UINT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access),          \
  274             ptr, val, vnet_sysctl_handle_uint, "IU", descr)
  275 #define VNET_SYSCTL_ARG(req, arg1) do {                                 \
  276         if (arg1 != NULL)                                               \
  277                 arg1 = (void *)(TD_TO_VNET((req)->td)->vnet_data_base + \
  278                     (uintptr_t)(arg1));                                 \
  279 } while (0)
  280 #endif /* SYSCTL_OID */
  281 
  282 /*
  283  * Virtual sysinit mechanism, allowing network stack components to declare
  284  * startup and shutdown methods to be run when virtual network stack
  285  * instances are created and destroyed.
  286  */
  287 #include <sys/kernel.h>
  288 
  289 /*
  290  * SYSINIT/SYSUNINIT variants that provide per-vnet constructors and
  291  * destructors.
  292  */
  293 struct vnet_sysinit {
  294         enum sysinit_sub_id     subsystem;
  295         enum sysinit_elem_order order;
  296         sysinit_cfunc_t         func;
  297         const void              *arg;
  298         TAILQ_ENTRY(vnet_sysinit) link;
  299 };
  300 
  301 #define VNET_SYSINIT(ident, subsystem, order, func, arg)                \
  302         static struct vnet_sysinit ident ## _vnet_init = {              \
  303                 subsystem,                                              \
  304                 order,                                                  \
  305                 (sysinit_cfunc_t)(sysinit_nfunc_t)func,                 \
  306                 (arg)                                                   \
  307         };                                                              \
  308         SYSINIT(vnet_init_ ## ident, subsystem, order,                  \
  309             vnet_register_sysinit, &ident ## _vnet_init);               \
  310         SYSUNINIT(vnet_init_ ## ident, subsystem, order,                \
  311             vnet_deregister_sysinit, &ident ## _vnet_init)
  312 
  313 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg)              \
  314         static struct vnet_sysinit ident ## _vnet_uninit = {            \
  315                 subsystem,                                              \
  316                 order,                                                  \
  317                 (sysinit_cfunc_t)(sysinit_nfunc_t)func,                 \
  318                 (arg)                                                   \
  319         };                                                              \
  320         SYSINIT(vnet_uninit_ ## ident, subsystem, order,                \
  321             vnet_register_sysuninit, &ident ## _vnet_uninit);           \
  322         SYSUNINIT(vnet_uninit_ ## ident, subsystem, order,              \
  323             vnet_deregister_sysuninit, &ident ## _vnet_uninit)
  324 
  325 /*
  326  * Run per-vnet sysinits or sysuninits during vnet creation/destruction.
  327  */
  328 void     vnet_sysinit(void);
  329 void     vnet_sysuninit(void);
  330 
  331 /*
  332  * Interfaces for managing per-vnet constructors and destructors.
  333  */
  334 void    vnet_register_sysinit(void *arg);
  335 void    vnet_register_sysuninit(void *arg);
  336 void    vnet_deregister_sysinit(void *arg);
  337 void    vnet_deregister_sysuninit(void *arg);
  338 
  339 /*
  340  * EVENTHANDLER(9) extensions.
  341  */
  342 #include <sys/eventhandler.h>
  343 
  344 void    vnet_global_eventhandler_iterator_func(void *, ...);
  345 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
  346 do {                                                                    \
  347         if (IS_DEFAULT_VNET(curvnet)) {                                 \
  348                 (tag) = vimage_eventhandler_register(NULL, #name, func, \
  349                     arg, priority,                                      \
  350                     vnet_global_eventhandler_iterator_func);            \
  351         }                                                               \
  352 } while(0)
  353 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority)    \
  354 do {                                                                    \
  355         if (IS_DEFAULT_VNET(curvnet)) {                                 \
  356                 vimage_eventhandler_register(NULL, #name, func,         \
  357                     arg, priority,                                      \
  358                     vnet_global_eventhandler_iterator_func);            \
  359         }                                                               \
  360 } while(0)
  361 
  362 #else /* !VIMAGE */
  363 
  364 /*
  365  * Various virtual network stack macros compile to no-ops without VIMAGE.
  366  */
  367 #define curvnet                 NULL
  368 
  369 #define VNET_ASSERT(exp, msg)
  370 #define CURVNET_SET(arg)
  371 #define CURVNET_SET_QUIET(arg)
  372 #define CURVNET_RESTORE()
  373 
  374 #define VNET_LIST_RLOCK()
  375 #define VNET_LIST_RLOCK_NOSLEEP()
  376 #define VNET_LIST_RUNLOCK()
  377 #define VNET_LIST_RUNLOCK_NOSLEEP()
  378 #define VNET_ITERATOR_DECL(arg)
  379 #define VNET_FOREACH(arg)
  380 
  381 #define IS_DEFAULT_VNET(arg)    1
  382 #define CRED_TO_VNET(cr)        NULL
  383 #define TD_TO_VNET(td)          NULL
  384 #define P_TO_VNET(p)            NULL
  385 
  386 /*
  387  * Versions of the VNET macros that compile to normal global variables and
  388  * standard sysctl definitions.
  389  */
  390 #define VNET_NAME(n)            n
  391 #define VNET_DECLARE(t, n)      extern t n
  392 #define VNET_DEFINE(t, n)       t n
  393 #define _VNET_PTR(b, n)         &VNET_NAME(n)
  394 
  395 /*
  396  * Virtualized global variable accessor macros.
  397  */
  398 #define VNET_VNET_PTR(vnet, n)          (&(n))
  399 #define VNET_VNET(vnet, n)              (n)
  400 
  401 #define VNET_PTR(n)             (&(n))
  402 #define VNET(n)                 (n)
  403 
  404 /*
  405  * When VIMAGE isn't compiled into the kernel, virtaulized SYSCTLs simply
  406  * become normal SYSCTLs.
  407  */
  408 #ifdef SYSCTL_OID
  409 #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr)     \
  410         SYSCTL_INT(parent, nbr, name, access, ptr, val, descr)
  411 #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler,  \
  412             fmt, descr)                                                 \
  413         SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt,  \
  414             descr)
  415 #define SYSCTL_VNET_OPAQUE(parent, nbr, name, access, ptr, len, fmt,    \
  416             descr)                                                      \
  417         SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr)
  418 #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr)  \
  419         SYSCTL_STRING(parent, nbr, name, access, arg, len, descr)
  420 #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
  421         SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr)
  422 #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr)    \
  423         SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr)
  424 #define VNET_SYSCTL_ARG(req, arg1)
  425 #endif /* SYSCTL_OID */
  426 
  427 /*
  428  * When VIMAGE isn't compiled into the kernel, VNET_SYSINIT/VNET_SYSUNINIT
  429  * map into normal sysinits, which have the same ordering properties.
  430  */
  431 #define VNET_SYSINIT(ident, subsystem, order, func, arg)                \
  432         SYSINIT(ident, subsystem, order, func, arg)
  433 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg)              \
  434         SYSUNINIT(ident, subsystem, order, func, arg)
  435 
  436 /*
  437  * Without VIMAGE revert to the default implementation.
  438  */
  439 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
  440         (tag) = eventhandler_register(NULL, #name, func, arg, priority)
  441 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority)    \
  442         eventhandler_register(NULL, #name, func, arg, priority)
  443 #endif /* VIMAGE */
  444 #endif /* _KERNEL */
  445 
  446 #endif /* !_NET_VNET_H_ */

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