Commit Graph

98 Commits

Author SHA1 Message Date
Gleb Smirnoff
4092996774 Big polling(4) cleanup.
o Axe poll in trap.

o Axe IFF_POLLING flag from if_flags.

o Rework revision 1.21 (Giant removal), in such a way that
  poll_mtx is not dropped during call to polling handler.
  This fixes problem with idle polling.

o Make registration and deregistration from polling in a
  functional way, insted of next tick/interrupt.

o Obsolete kern.polling.enable. Polling is turned on/off
  with ifconfig.

Detailed kern_poll.c changes:
  - Remove polling handler flags, introduced in 1.21. The are not
    needed now.
  - Forget and do not check if_flags, if_capenable and if_drv_flags.
  - Call all registered polling handlers unconditionally.
  - Do not drop poll_mtx, when entering polling handlers.
  - In ether_poll() NET_LOCK_GIANT prior to locking poll_mtx.
  - In netisr_poll() axe the block, where polling code asks drivers
    to unregister.
  - In netisr_poll() and ether_poll() do polling always, if any
    handlers are present.
  - In ether_poll_[de]register() remove a lot of error hiding code. Assert
    that arguments are correct, instead.
  - In ether_poll_[de]register() use standard return values in case of
    error or success.
  - Introduce poll_switch() that is a sysctl handler for kern.polling.enable.
    poll_switch() goes through interface list and enabled/disables polling.
    A message that kern.polling.enable is deprecated is printed.

Detailed driver changes:
  - On attach driver announces IFCAP_POLLING in if_capabilities, but
    not in if_capenable.
  - On detach driver calls ether_poll_deregister() if polling is enabled.
  - In polling handler driver obtains its lock and checks IFF_DRV_RUNNING
    flag. If there is no, then unlocks and returns.
  - In ioctl handler driver checks for IFCAP_POLLING flag requested to
    be set or cleared. Driver first calls ether_poll_[de]register(), then
    obtains driver lock and [dis/en]ables interrupts.
  - In interrupt handler driver checks IFCAP_POLLING flag in if_capenable.
    If present, then returns.This is important to protect from spurious
    interrupts.

Reviewed by:	ru, sam, jhb
2005-10-01 18:56:19 +00:00
Robert Watson
fc57457045 For each interface flag, indicate whether or not it is owned by the
device driver, owned by the network stack, or initialized by the device
driver before attach and read-only from then on.

Not all device drivers and network stack components currently follow
these rules, especially with respect to IFF_UP, and a few exceptions
with IFF_ALLMULTI.

MFC after:	7 days
2005-08-09 12:56:20 +00:00
Robert Watson
292ee7be1c Rename IFF_RUNNING to IFF_DRV_RUNNING, IFF_OACTIVE to IFF_DRV_OACTIVE,
and move both flags from ifnet.if_flags to ifnet.if_drv_flags, making
and documenting the locking of these flags the responsibility of the
device driver, not the network stack.  The flags for these two fields
will be mutually exclusive so that they can be exposed to user space as
though they were stored in the same variable.

Provide #defines to provide the old names #ifndef _KERNEL, so that user
applications (such as ifconfig) can use the old flag names.  Using the
old names in a device driver will result in a compile error in order to
help device driver writers adopt the new model.

When exposing the interface flags to user space, via interface ioctls
or routing sockets, or the two fields together.  Since the driver flags
cannot currently be set for user space, no new logic is currently
required to handle this case.

Add some assertions that general purpose network stack routines, such
as if_setflags(), are not improperly used on driver-owned flags.

With this change, a large number of very minor network stack races are
closed, subject to correct device driver locking.  Most were likely
never triggered.

Driver sweep to follow; many thanks to pjd and bz for the line-by-line
review they gave this patch.

Reviewed by:	pjd, bz
MFC after:	7 days
2005-08-09 10:16:17 +00:00
Andrew Thompson
8f86751705 Add hooks into the networking layer to support if_bridge. This changes struct
ifnet so a buildworld is necessary.

Approved by:	mlaier (mentor)
Obtained from:	NetBSD
2005-06-05 03:13:13 +00:00
Brooks Davis
bc9d299133 Change the definition of struct if_data's member ifi_epoch from wall
clock time to uptime because wall clock time may go backwards.

This is a change in the API which will impact SNMP agents who are using
ifi_epoch to set RFC2233's ifCounterDiscontinuityTime.  None are know to
exist today.  This will not impact applications that are using the
<index, epoch> tuple to verify interface uniqueness except that it
eliminates a race which could lead to a false assumption of uniqueness.

Because this is a behavior change, bump __FreeBSD_version.

Discussed with:	re (jhb, scottl)
MFC after:	3 days
Pointed out by:	pkh (way back at EuroBSDCon)
Pointy hat:	brooks
2005-02-25 19:46:41 +00:00
Warner Losh
c398230b64 /* -> /*- for license, minor formatting changes 2005-01-07 01:45:51 +00:00
John-Mark Gurney
1f48dc25d7 sync comment on IFF_OACTIVE with reality.. IFF_OACTIVE is set when the
hardware cannot take anymore packets, and so will supress the calling of
the device's if_start method...

Submitted by:	bde
2004-11-17 18:32:44 +00:00
Brooks Davis
55287f2a60 Re-add ifi_epoch, to struct if_data, this time replacing ifi_unused
to avoid ABI changes.  It is set to the last time the interface
counters were zeroed, currently the time if_attach() was called.  It is
intentended to be a valid value for RFC2233's ifCounterDiscontinuityTime
and to make it easier for applications to verify that the interface they
find at a given index is the one that was there last time they looked.

Due to space constraints ifi_epoch is a time_t rather then a struct
timeval.  SNMP would prefer higher precision, but this unlikely to be
useful in practice.
2004-09-08 04:50:55 +00:00
Brooks Davis
4ff62bd97b Back out ifi_epoch. The ABI breakage is too disruptive this close to
5-STABLE. ifi_epoch will shortly be reintroduced with less precistion
using the space currently allocated to ifi_unused.
2004-09-02 05:07:29 +00:00
Brooks Davis
9e734b4468 Use a spare byte in struct if_data to store the structure size without
increasing it.  Add code to ifconfig to use this size to find the
sockaddr_dl after the struct if_data in the routing message.  This
allows struct if_data to grow (up to 255 bytes) without breaking
ifconfig.

Submitted by:	peter
2004-09-01 18:22:14 +00:00
Brooks Davis
1fc4519b1d Add a new variable, ifi_epoch, to struct if_data. It is set to the last
time the interface counters were zeroed, currently the time if_attach()
was called.  It is indentended to be a valid value for RFC2233's
ifCounterDiscontinuityTime and to make it easier for applications to
verify that the interface they find at a given index is the one that was
there last time they looked.

An if_epoch "compatability" macro has not been created as ifi_epoch has
never been a member of struct ifnet.

Approved by:	andre, bms, wollman
2004-08-30 06:29:26 +00:00
Robert Watson
af5e59bf28 Add a new network interface flag, IFF_NEEDSGIANT, which will allow
device drivers to declare that the ifp->if_start() method implemented
by the driver requires Giant in order to operate correctly.

Add a 'struct task' to 'struct ifnet' that can be used to execute a
deferred ifp->if_start() in the event that if_start needs to be called
in a Giant-free environment.  To do this, introduce if_start(), a
wrapper function for ifp->if_start().  If the interface can run MPSAFE,
it directly dispatches into the interface start routine.  If it can't
run MPSAFE, we're running with debug.mpsafenet != 0, and Giant isn't
currently held, the task is queued to execute in a swi holding Giant
via if_start_deferred().

Modify if_handoff() to use if_start() instead of direct dispatch.
Modify 802.11 to use if_start() instead of direct dispatch.

This is intended to provide increased compatibility for non-MPSAFE
network device drivers in the presence of Giant-free operation via
asynchronous dispatch.  However, this commit does not mark any network
interfaces as IFF_NEEDSGIANT.
2004-07-27 23:20:45 +00:00
Brooks Davis
f889d2ef8d Major overhaul of pseudo-interface cloning. Highlights include:
- Split the code out into if_clone.[ch].
 - Locked struct if_clone. [1]
 - Add a per-cloner match function rather then simply matching names of
   the form <name><unit> and <name>.
 - Use the match function to allow creation of <interface>.<tag>
   vlan interfaces.  The old way is preserved unchanged!
 - Also the match function to allow creation of stf(4) interfaces named
   stf0, stf, or 6to4.  This is the only major user visible change in
   that "ifconfig stf" creates the interface stf rather then stf0 and
   does not print "stf0" to stdout.
 - Allow destroy functions to fail so they can refuse to delete
   interfaces.  Currently, we forbid the deletion of interfaces which
   were created in the init function, particularly lo0, pflog0, and
   pfsync0.  In the case of lo0 this was a panic implementation so it
   does not count as a user visiable change. :-)
 - Since most interfaces do not need the new functionality, an family of
   wrapper functions, ifc_simple_*(), were created to wrap old style
   cloner functions.
 - The IF_CLONE_INITIALIZER macro is replaced with a new incompatible
   IFC_CLONE_INITIALIZER and ifc_simple consumers use IFC_SIMPLE_DECLARE
   instead.

Submitted by:   Maurycy Pawlowski-Wieronski <maurycy at fouk.org> [1]
Reviewed by:    andre, mlaier
Discussed on:	net
2004-06-22 20:13:25 +00:00
Andre Oppermann
127d7b2d2d Link state change notification of ethernet media to the routing socket.
o Extend the if_data structure with an ifi_link_state field and
  provide the corresponding defines for the valid states.

o The mii_linkchg() callback updates the ifi_link_state field
  and calls rt_ifmsg() to notify listeners on the routing socket
  in addition to the kqueue KNOTE.

o If vlans are configured on a physical interface notify and update
  all vlan pseudo devices as well with the vlan_link_state() callback.

No objections by:	sam, wpaul, ru, bms
Brucification by:	bde
2004-05-03 13:48:35 +00:00
Ruslan Ermilov
3a3b019aeb Added the new interface capability option for drivers that implement
user-configurable polling(4) support.  Make ifconfig(8) aware of it.

Suggested by:	luigi
2004-04-11 13:36:52 +00:00
Warner Losh
f36cfd49ad Remove advertising clause from University of California Regent's
license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson
2004-04-07 20:46:16 +00:00
Brooks Davis
9bf40ede4a Replace the if_name and if_unit members of struct ifnet with new members
if_xname, if_dname, and if_dunit. if_xname is the name of the interface
and if_dname/unit are the driver name and instance.

This change paves the way for interface renaming and enhanced pseudo
device creation and configuration symantics.

Approved By:	re (in principle)
Reviewed By:	njl, imp
Tested On:	i386, amd64, sparc64
Obtained From:	NetBSD (if_xname)
2003-10-31 18:32:15 +00:00
Ruslan Ermilov
deb62e2887 By popular demand, added the "static ARP" per-interface option. 2003-10-01 08:32:37 +00:00
Sam Leffler
bb68f0af5e o add IF_*bps macros for netbsd compatibility
o add interface capabilities for vlan use and to signal jumbo frame support

Reviewed by:	many
Approved by:	re
2002-11-14 23:16:18 +00:00
Mike Barcroft
edfcad955c style(9):
o Align members of struct if_nameindex.
o Align and sort function prototypes.
2002-10-02 07:55:33 +00:00
Mike Barcroft
f2ba8326cd Use standards visibility conditionals to conditionalize most of this
header (details on how the visibility conditionals work are available
in <sys/cdefs.h>).  Use standard types instead of BSD specific ones,
so that this header compiles in the standards case (specifically this
means changing `u_int' to `unsigned int').
2002-10-02 07:44:50 +00:00
Poul-Henning Kamp
afbe3a0f81 Add the "Monitor" interface flag.
Setting this flag on an ethernet interface blocks transmission of packets
and discards incoming packets after BPF processing.

This is useful if you want to monitor network trafic but not interact
with the network in question.

Sponsored by:	http://www.babeltech.dk
2002-09-27 18:57:47 +00:00
Maxim Sobolev
9717c34cf8 Add IFF_POLLING into the list of flags which are protected from changing via
ioctl(SIOCSIFFLAGS).

MFC after:	1 day
2002-08-28 15:55:49 +00:00
Maxim Sobolev
ffb079be0c Implement user-setable promiscuous mode (a new `promisc' flag for ifconfig(8)).
Also, for all interfaces in this mode pass all ethernet frames to upper layer,
even those not addressed to our own MAC, which allows packets encapsulated
in those frames be processed with packet filters (ipfw(8) et al).

Emphatically requested by:	Anton Turygin <pa3op@ukr-link.net>
Valuable suggestions by:	fenner
2002-08-19 15:16:38 +00:00
Maxim Sobolev
62f7648682 Increase size of ifnet.if_flags from 16 bits (short) to 32 bits (int). To avoid
breaking application ABI use unused ifreq.ifru_flags[1] for upper 16 bits in
SIOCSIFFLAGS and SIOCGIFFLAGS ioctl's.

Reviewed by:	-hackers, -net
2002-08-18 07:05:00 +00:00
Brooks Davis
ae5a19be8e Move all unit number management cloned interfaces into the cloning
code.  The reverts the API change which made the <if>_clone_destory()
functions return an int instead of void bringing us into closer
alignment with NetBSD.

Reviewed by:	net (a long time ago)
2002-05-25 20:17:04 +00:00
Ian Dowse
d497e87891 Avoid exposing struct if_clone and the sys/queue.h macros to userland
programs by restricting these to the case where _KERNEL is defined.

Reviewed by:	brooks (ages ago)
2002-05-20 22:48:39 +00:00
Alfred Perlstein
929ddbbb89 Remove __P. 2002-03-19 21:54:18 +00:00
Maxime Henrion
3b16e7b252 Simplify the interface cloning framework by handling unit
unit allocation with a bitmap in the generic layer.  This
allows us to get rid of the duplicated rman code in every
clonable interface.

Reviewed by:	brooks
Approved by:	phk
2002-03-11 09:26:07 +00:00
Brooks Davis
b75496fedf Change the network interface cloning API so the destroy function returns
an int errorcode instead of void in preperation for merging cloning of
the loopback device.

Submitted by:	mux
MFC after:	2 weeks
2002-03-04 21:43:49 +00:00
Ruslan Ermilov
7b6edd044b Introduce an interface announcement message for the routing
socket so that routing daemons and other interested parties
know when an interface is attached/detached.

PR:		kern/33747
Obtained from:	NetBSD
MFC after:	2 weeks
2002-01-18 14:33:04 +00:00
Luigi Rizzo
e4fc250c15 Device Polling code for -current.
Non-SMP, i386-only, no polling in the idle loop at the moment.

To use this code you must compile a kernel with

        options DEVICE_POLLING

and at runtime enable polling with

        sysctl kern.polling.enable=1

The percentage of CPU reserved to userland can be set with

        sysctl kern.polling.user_frac=NN (default is 50)

while the remainder is used by polling device drivers and netisr's.
These are the only two variables that you should need to touch. There
are a few more parameters in kern.polling but the default values
are adequate for all purposes. See the code in kern_poll.c for
more details on them.

Polling in the idle loop will be implemented shortly by introducing
a kernel thread which does the job. Until then, the amount of CPU
dedicated to polling will never exceed (100-user_frac).
The equivalent (actually, better) code for -stable is at

	http://info.iet.unipi.it/~luigi/polling/

and also supports polling in the idle loop.

NOTE to Alpha developers:
There is really nothing in this code that is i386-specific.
If you move the 2 lines supporting the new option from
sys/conf/{files,options}.i386 to sys/conf/{files,options} I am
pretty sure that this should work on the Alpha as well, just that
I do not have a suitable test box to try it. If someone feels like
trying it, I would appreciate it.

NOTE to other developers:
sure some things could be done better, and as always I am open to
constructive criticism, which a few of you have already given and
I greatly appreciated.
However, before proposing radical architectural changes, please
take some time to possibly try out this code, or at the very least
read the comments in kern_poll.c, especially re. the reason why I
am using a soft netisr and cannot (I believe) replace it with a
simple timeout.

Quick description of files touched by this commit:

sys/conf/files.i386
        new file kern/kern_poll.c
sys/conf/options.i386
        new option
sys/i386/i386/trap.c
        poll in trap (disabled by default)
sys/kern/kern_clock.c
        initialization and hardclock hooks.
sys/kern/kern_intr.c
        minor swi_net changes
sys/kern/kern_poll.c
        the bulk of the code.
sys/net/if.h
        new flag
sys/net/if_var.h
        declaration for functions used in device drivers.
sys/net/netisr.h
        NETISR_POLL
sys/dev/fxp/if_fxp.c
sys/dev/fxp/if_fxpvar.h
sys/pci/if_dc.c
sys/pci/if_dcreg.h
sys/pci/if_sis.c
sys/pci/if_sisreg.h
        device driver modifications
2001-12-14 17:56:12 +00:00
Jonathan Lemon
de5934508a Add a SIOCGIFINDEX ioctl, which returns the index of a named interface.
This will be used to more efficiently support if_nametoindex(3).
2001-10-17 19:40:44 +00:00
Jonathan Lemon
f7d866924c Split HWCSUM into two components: RX and TX, for the benefit of drivers
which can only do checksum offloading in one direction.
2001-09-18 20:13:03 +00:00
Jonathan Lemon
016da741b2 Add two fields to the ifnet structure indicating what extra capabilities
a network device has, and which ones are enabled.
2001-09-18 17:41:42 +00:00
Julian Elischer
b40ce4165d KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after:    ha ha ha ha
2001-09-12 08:38:13 +00:00
Brooks Davis
30aad87d72 Add kernel infrastructure for network device cloning.
Reviewed by:	ru, ume
Obtained from:	NetBSD
MFC after:	1 week
2001-07-02 20:49:25 +00:00
Robert Watson
91421ba234 o Move per-process jail pointer (p->pr_prison) to inside of the subject
credential structure, ucred (cr->cr_prison).
o Allow jail inheritence to be a function of credential inheritence.
o Abstract prison structure reference counting behind pr_hold() and
  pr_free(), invoked by the similarly named credential reference
  management functions, removing this code from per-ABI fork/exit code.
o Modify various jail() functions to use struct ucred arguments instead
  of struct proc arguments.
o Introduce jailed() function to determine if a credential is jailed,
  rather than directly checking pointers all over the place.
o Convert PRISON_CHECK() macro to prison_check() function.
o Move jail() function prototypes to jail.h.
o Emulate the P_JAILED flag in fill_kinfo_proc() and no longer set the
  flag in the process flags field itself.
o Eliminate that "const" qualifier from suser/p_can/etc to reflect
  mutex use.

Notes:

o Some further cleanup of the linux/jail code is still required.
o It's now possible to consider resolving some of the process vs
  credential based permission checking confusion in the socket code.
o Mutex protection of struct prison is still not present, and is
  required to protect the reference count plus some fields in the
  structure.

Reviewed by:	freebsd-arch
Obtained from:	TrustedBSD Project
2001-02-21 06:39:57 +00:00
Jeroen Ruigrok van der Werven
2fa72ea7d4 Fix typo: compatability -> compatibility.
Compatability is not an existing english word.
2001-02-06 12:05:58 +00:00
Jonathan Lemon
db4f9cc703 Add support for offloading IP/TCP/UDP checksums to NIC hardware which
supports them.
2000-03-27 19:14:27 +00:00
Peter Wemm
664a31e496 Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"
is an application space macro and the applications are supposed to be free
to use it as they please (but cannot).  This is consistant with the other
BSD's who made this change quite some time ago.  More commits to come.
1999-12-29 04:46:21 +00:00
Yoshinobu Inoue
76429de41a KAME related header files additions and merges.
(only those which don't affect c source files so much)

Reviewed by: cvs-committers
Obtained from: KAME project
1999-11-05 14:41:39 +00:00
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
Bruce Evans
712020a15a Fixed English errors, spelling errors and formatting errors in rev.1.51
and rev.1.53.
1999-07-05 12:00:05 +00:00
Poul-Henning Kamp
413dd0ba39 Add a new interface ioctl, to return "aux status".
This is inteded for to allow ifconfig to print various unstructured
information from an interface.

The data is returned from the kernel in ASCII form, see the comment in
if.h for some technicalities.

Canonical cut&paste example to be found in if_tun.c

Initial use:
        Now tun* interfaces tell the PID of the process which opened them.

Future uses could be (volounteers welcome!):
        Have ppp/slip interfaces tell which tty they use.
        Make sync interfaces return their media state: red/yellow/blue
        alarm, timeslot assignment and so on.
        Make ethernets warn about missing heartbeats and/or cables
1999-06-19 18:42:31 +00:00
Poul-Henning Kamp
cf4b937128 Introduce IFF_SMART bit.
This means that the driver will add/delete routes when it knows it is
up/down, rather than have the generic code belive it is up if configured.

This is probably most useful for serial lines, although many PHY chips
could probably tell us if we're connected to the cable/hub as well.
1999-06-06 09:17:51 +00:00
Poul-Henning Kamp
cb40a67f2b Fix some disordering I introduced with the jail code. 1999-05-08 07:00:04 +00:00
Poul-Henning Kamp
75c1354190 This Implements the mumbled about "Jail" feature.
This is a seriously beefed up chroot kind of thing.  The process
is jailed along the same lines as a chroot does it, but with
additional tough restrictions imposed on what the superuser can do.

For all I know, it is safe to hand over the root bit inside a
prison to the customer living in that prison, this is what
it was developed for in fact:  "real virtual servers".

Each prison has an ip number associated with it, which all IP
communications will be coerced to use and each prison has its own
hostname.

Needless to say, you need more RAM this way, but the advantage is
that each customer can run their own particular version of apache
and not stomp on the toes of their neighbors.

It generally does what one would expect, but setting up a jail
still takes a little knowledge.

A few notes:

   I have no scripts for setting up a jail, don't ask me for them.

   The IP number should be an alias on one of the interfaces.

   mount a /proc in each jail, it will make ps more useable.

   /proc/<pid>/status tells the hostname of the prison for
   jailed processes.

   Quotas are only sensible if you have a mountpoint per prison.

   There are no privisions for stopping resource-hogging.

   Some "#ifdef INET" and similar may be missing (send patches!)

If somebody wants to take it from here and develop it into
more of a "virtual machine" they should be most welcome!

Tools, comments, patches & documentation most welcome.

Have fun...

Sponsored by:   http://www.rndassociates.com/
Run for almost a year by:       http://www.servetheweb.com/
1999-04-28 11:38:52 +00:00
Poul-Henning Kamp
4add131ea8 Since ifru_flags is a short, we can fit in a copy of the flags
before they got changed.  This can help eliminate much of the
gymnastics drivers do in their ioctl routines to figure this out.

Remove commented out IFF_NOTRAILERS
1999-02-19 13:41:35 +00:00
Peter Wemm
09410d0f8b On most other systems "out there", <net/if.h> does not require the caller
to #include <sys/time.h> first.  I've lost count of the number of times
I've had to patch this in porting code.  The problem is the
"struct timeval ifi_lastchange" in the mib stats.  (most other systems don't
have this, until 4.4bsd anyway).
1998-03-21 13:36:20 +00:00