freebsd-dev/sys/net/if_mib.c

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/*-
* Copyright 1996 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. 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.
*
1999-08-28 01:08:13 +00:00
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_mib.h>
#include <net/vnet.h>
/*
* A sysctl(3) MIB for generic interface information. This information
* is exported in the net.link.generic branch, which has the following
* structure:
*
* net.link.generic .system - system-wide control variables
* and statistics (node)
* .ifdata.<ifindex>.general
* - what's in `struct ifdata'
* plus some other info
* .ifdata.<ifindex>.linkspecific
* - a link-type-specific data
* structure (as might be used
* by an SNMP agent
*
* Perhaps someday we will make addresses accessible via this interface
* as well (then there will be four such...). The reason that the
* index comes before the last element in the name is because it
* seems more orthogonal that way, particularly with the possibility
* of other per-interface data living down here as well (e.g., integrated
* services stuff).
*/
SYSCTL_DECL(_net_link_generic);
static SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
"Variables global to all interfaces");
Build on Jeff Roberson's linker-set based dynamic per-CPU allocator (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)
2009-07-14 22:48:30 +00:00
SYSCTL_VNET_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
&VNET_NAME(if_index), 0,
"Number of configured interfaces");
static int
sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
{
int *name = (int *)arg1;
int error;
u_int namelen = arg2;
struct ifnet *ifp;
struct ifmibdata ifmd;
size_t dlen;
char *dbuf;
if (namelen != 2)
return EINVAL;
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
if (name[0] <= 0)
return (ENOENT);
ifp = ifnet_byindex_ref(name[0]);
if (ifp == NULL)
return (ENOENT);
switch(name[1]) {
default:
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
error = ENOENT;
goto out;
case IFDATA_GENERAL:
bzero(&ifmd, sizeof(ifmd));
strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
#define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
COPY(pcount);
COPY(data);
#undef COPY
ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
if (error || !req->newptr)
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
goto out;
error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
if (error)
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
goto out;
#define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
DONTCOPY(type);
DONTCOPY(physical);
DONTCOPY(addrlen);
DONTCOPY(hdrlen);
DONTCOPY(mtu);
DONTCOPY(metric);
DONTCOPY(baudrate);
#undef DONTCOPY
#define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
COPY(data);
ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
#undef COPY
break;
case IFDATA_LINKSPECIFIC:
error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
if (error || !req->newptr)
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
goto out;
error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
if (error)
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
goto out;
break;
case IFDATA_DRIVERNAME:
/* 20 is enough for 64bit ints */
dlen = strlen(ifp->if_dname) + 20 + 1;
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
error = ENOMEM;
goto out;
}
if (ifp->if_dunit == IF_DUNIT_NONE)
strcpy(dbuf, ifp->if_dname);
else
sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
if (error == 0 && req->newptr != NULL)
error = EPERM;
free(dbuf, M_TEMP);
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
goto out;
}
Start to address a number of races relating to use of ifnet pointers after the corresponding interface has been destroyed: (1) Add an ifnet refcount, ifp->if_refcount. Initialize it to 1 in if_alloc(), and modify if_free_type() to decrement and check the refcount. (2) Add new if_ref() and if_rele() interfaces to allow kernel code walking global interface lists to release IFNET_[RW]LOCK() yet keep the ifnet stable. Currently, if_rele() is a no-op wrapper around if_free(), but this may change in the future. (3) Add new ifnet field, if_alloctype, which caches the type passed to if_alloc(), but unlike if_type, won't be changed by drivers. This allows asynchronous free's of the interface after the driver has released it to still use the right type. Use that instead of the type passed to if_free_type(), but assert that they are the same (might have to rethink this if that doesn't work out). (4) Add a new ifnet_byindex_ref(), which looks up an interface by index and returns a reference rather than a pointer to it. (5) Fix if_alloc() to fully initialize the if_addr_mtx before hooking up the ifnet to global lists. (6) Modify sysctls in if_mib.c to use ifnet_byindex_ref() and release the ifnet when done. When this change is MFC'd, it will need to replace if_ispare fields rather than adding new fields in order to avoid breaking the binary interface. Once this change is MFC'd, if_free_type() should be removed, as its 'type' argument is now optional. This refcount is not appropriate for counting mbuf pkthdr references, and also not for counting entry into the device driver via ifnet function pointers. An rmlock may be appropriate for the latter. Rather, this is about ensuring data structure stability when reaching an ifnet via global ifnet lists and tables followed by copy in or out of userspace. MFC after: 3 weeks Reported by: mdtancsa Reviewed by: brooks
2009-04-21 22:43:32 +00:00
out:
if_rele(ifp);
return error;
}
static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
sysctl_ifdata, "Interface table");