/*- * 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 * 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 struct vnet { LIST_ENTRY(vnet) vnet_le; /* all vnets list */ u_int vnet_magic_n; u_int vnet_ifcnt; u_int vnet_sockcnt; 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 #ifdef VIMAGE #include #include /* for struct thread */ #include #include /* * 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. */ #ifdef VNET_DEBUG void vnet_log_recursion(struct vnet *, const char *, int); #define VNET_ASSERT(condition) \ if (!(condition)) { \ printf("VNET_ASSERT @ %s:%d %s():\n", \ __FILE__, __LINE__, __FUNCTION__); \ panic(#condition); \ } #define CURVNET_SET_QUIET(arg) \ VNET_ASSERT((arg)->vnet_magic_n == VNET_MAGIC_N); \ struct vnet *saved_vnet = curvnet; \ const char *saved_vnet_lpush = curthread->td_vnet_lpush; \ curvnet = arg; \ curthread->td_vnet_lpush = __FUNCTION__; #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(saved_vnet == NULL || \ saved_vnet->vnet_magic_n == VNET_MAGIC_N); \ curvnet = saved_vnet; \ curthread->td_vnet_lpush = saved_vnet_lpush; #else /* !VNET_DEBUG */ #define VNET_ASSERT(condition) #define CURVNET_SET(arg) \ struct vnet *saved_vnet = curvnet; \ curvnet = arg; #define CURVNET_SET_VERBOSE(arg) CURVNET_SET(arg) #define CURVNET_SET_QUIET(arg) CURVNET_SET(arg) #define CURVNET_RESTORE() \ 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) #define VNET_DEFINE(t, n) t VNET_NAME(n) __section(VNET_SETNAME) __used #define STATIC_VNET_DEFINE(t, n) \ VNET_DEFINE(static t, n) #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); /* * Sysctl variants for vnet-virtualized global variables. Include * to expose these definitions. * * Note: SYSCTL_PROC() handler functions will need to resolve pointer * arguments themselves, if required. */ #ifdef SYSCTL_OID int vnet_sysctl_handle_int(SYSCTL_HANDLER_ARGS); int vnet_sysctl_handle_opaque(SYSCTL_HANDLER_ARGS); int vnet_sysctl_handle_string(SYSCTL_HANDLER_ARGS); int vnet_sysctl_handle_uint(SYSCTL_HANDLER_ARGS); #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \ SYSCTL_OID(parent, nbr, name, \ CTLTYPE_INT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access), \ ptr, val, vnet_sysctl_handle_int, "I", descr) #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \ fmt, descr) \ SYSCTL_OID(parent, nbr, name, CTLFLAG_VNET|(access), ptr, arg, \ handler, fmt, descr) #define SYSCTL_VNET_OPAQUE(parent, nbr, name, access, ptr, len, fmt, \ descr) \ SYSCTL_OID(parent, nbr, name, \ CTLTYPE_OPAQUE|CTLFLAG_VNET|(access), ptr, len, \ vnet_sysctl_handle_opaque, fmt, descr) #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \ SYSCTL_OID(parent, nbr, name, \ CTLTYPE_STRING|CTLFLAG_VNET|(access), \ arg, len, vnet_sysctl_handle_string, "A", descr) #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \ SYSCTL_OID(parent, nbr, name, \ CTLTYPE_OPAQUE|CTLFLAG_VNET|(access), ptr, \ sizeof(struct type), vnet_sysctl_handle_opaque, "S," #type, \ descr) #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \ SYSCTL_OID(parent, nbr, name, \ CTLTYPE_UINT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access), \ ptr, val, vnet_sysctl_handle_uint, "IU", descr) #define VNET_SYSCTL_ARG(req, arg1) do { \ if (arg1 != NULL) \ arg1 = (void *)(TD_TO_VNET((req)->td)->vnet_data_base + \ (uintptr_t)(arg1)); \ } while (0) #endif /* SYSCTL_OID */ /* * 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 /* * 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 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(condition) #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) t n #define STATIC_VNET_DEFINE(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, virtaulized SYSCTLs simply * become normal SYSCTLs. */ #ifdef SYSCTL_OID #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \ SYSCTL_INT(parent, nbr, name, access, ptr, val, descr) #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \ fmt, descr) \ SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, \ descr) #define SYSCTL_VNET_OPAQUE(parent, nbr, name, access, ptr, len, fmt, \ descr) \ SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr) #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \ SYSCTL_STRING(parent, nbr, name, access, arg, len, descr) #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \ SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr) #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \ SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr) #define VNET_SYSCTL_ARG(req, arg1) #endif /* SYSCTL_OID */ /* * 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_ */