Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r236170,236176:

It turns out that too many drivers are not only parsing the L2/3/4
headers for TSO but also for generic checksum offloading. Ideally we
would only have one common function shared amongst all drivers, and
perhaps when updating them for IPv6 we should introduce that.
Eventually we should provide the meta information along with mbufs to
avoid (re-)parsing entirely.

To not break IPv6 (checksums and offload) and to be able to MFC the
changes without risking to hurt 3rd party drivers, duplicate the v4
framework, as other OSes have done as well.

Introduce interface capability flags for TX/RX checksum offload with
IPv6, to allow independent toggling (where possible). Add CSUM_*_IPV6
flags for UDP/TCP over IPv6, and reserve further for SCTP, and IPv6
fragmentation. Define CSUM_DELAY_DATA_IPV6 as we do for legacy IP and
add an alias for CSUM_DATA_VALID_IPV6.

This pretty much brings IPv6 handling in line with IPv4.
TSO is still handled in a different way and not via if_hwassist.

Update ifconfig to allow (un)setting of the new capability flags.
Update loopback to announce the new capabilities and if_hwassist flags.

Individual driver updates will have to follow, as will SCTP.

Removed the IFCAP_ prefix when printing the IPv6 checksum capabilities.

Approved by: re

MFC r231505,231520:

Introduce a new NET_RT_IFLISTL API to query the address list. It works
on extended and extensible structs if_msghdrl and ifa_msghdrl. This
will allow us to extend both the msghdrl structs and eventually if_data
in the future without breaking the ABI.

The MFC is just to provide the new API to old stable branches to make
updating and if needed downgrading a lot easier for updates to 10.

Bump __FreeBSD_version to allow ports to more easily detect the new API.

Reviewed by: brooks
Tested by: brooks

MFC r226610:

Add missing #includes.

According to POSIX, these two header files should be able to be included
by themselves, not depending on other headers. The <net/if.h> header
uses struct sockaddr when __BSD_VISIBLE=1, while <netinet/tcp.h> uses
integer datatypes (u_int32_t, u_short, etc).

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Add infrastructure to allow all frames/packets received on an interface
to be assigned to a non-default FIB instance.

You may need to recompile world or ports due to the change of struct ifnet.

Submitted by: cjsp
Submitted by: Alexander V. Chernikov (melifaro ipfw.ru)
(original versions)
Reviewed by: julian
Reviewed by: Alexander V. Chernikov (melifaro ipfw.ru)
MFC after: 2 weeks
X-MFC: use spare in struct ifnet

Grab one of the ifcap bits for netmap, and enable printing in ifconfig.

Document the fact that we might want an IFCAP_CANTCHANGE mask,
even though the value is not yet used in sys/net/if.c

(asked on -current a week ago, no feedback so i assume no objection).

Adds IFF_CANTCONFIG to IFF_CANTCHANGE that it shouldn't happen through
ioctl(2).

Introduces IFF_CANTCONFIG interface flag to point that the interface
isn't configurable in a meaningful way. This is for ifconfig(8) or
other tools not to change code whenever IFT_USB-like interfaces are
registered at the interface list.

Reviewed by: brooks
No objections: gavin, jkim

Reshuffle SIOCGIFCONF32 handler from r155224.

- move all the chunks into one file, which allows to hide SIOCGIFCONF32
global definition as well.
- replace __amd64__ with proper COMPAT_FREEBSD32 around.
- handle 32bit capacity before going into the handler itself instead of
doing internal 32bit specific changes within it (e.g. as it's done for
SIOCGDEFIFACE32_IN6).
- use explicitely sized types for ABI compat.

Approved by: kib (mentor)
MFC after: 2 weeks

Verify interface up status using its link state only
if the interface has such capability. The interface
capability flag indicates whether such capability
exists. This approach is much more backward compatible.
Physical device driver changes will be part of another
commit.

Also updated the ifconfig utility to show the LINKSTATE
capability if present.

Reviewed by: rwatson, imp, juli
MFC after: 3 days

Add TSO support on VLANs. Intentionally separated IFCAP_VLAN_HWTSO
from IFCAP_VLAN_HWTAGGING. I think some hardwares may be able to
TSO over VLAN without VLAN hardware tagging.
Driver changes and userland support will follow.

Reviewed by: thompsa

Revised revision 199201 (add interface description capability as inspired
by OpenBSD), based on comments from many, including rwatson, jhb, brooks
and others.

Sponsored by: iXsystems, Inc.
MFC after: 1 month

Change vlan interfaces to cope more usefully with the parent interface being
renamed. Previously the vlan interfaces would lose their configuration as if
the parent interface had been physically removed. Now vlan interfaces ignore
rename events.
- Add a new ifnet flag (IFF_RENAMING) that is set while an ifnet is being
renamed. This flag can be checked in ifnet departure/arrival event
handlers to treat rename events differently.
- Change the ifnet departure event handler in the if_vlan(4) driver to
ignore departure events due to a trunk interface being renamed.

Reviewed by: brooks, rwatson
MFC after: 1 week

Revert revision 199201 for now as it has introduced a kernel vulnerability
and requires more polishing.

Add interface description capability as inspired by OpenBSD.

MFC after: 3 months

Manage vnets via the jail system. If a jail is given the boolean
parameter "vnet" when it is created, a new vnet instance will be created
along with the jail. Networks interfaces can be moved between prisons
with an ioctl similar to the one that moves them between vimages.
For now vnets will co-exist under both jails and vimages, but soon
struct vimage will be going away.

Reviewed by: zec, julian
Approved by: bz (mentor)

When user_frac in the polling subsystem is low it is going to busy the
CPU for too long period than necessary. Additively, interfaces are kept
polled (in the tick) even if no more packets are available.
In order to avoid such situations a new generic mechanism can be
implemented in proactive way, keeping track of the time spent on any
packet and fragmenting the time for any tick, stopping the processing
as soon as possible.

In order to implement such mechanism, the polling handler needs to
change, returning the number of packets processed.
While the intended logic is not part of this patch, the polling KPI is
broken by this commit, adding an int return value and the new flag
IFCAP_POLLING_NOCOUNT (which will signal that the return value is
meaningless for the installed handler and checking should be skipped).

Bump __FreeBSD_version in order to signal such situation.

Reviewed by: emaste
Sponsored by: Sandvine Incorporated

Add a new interface flag, IFF_DYING, which is set when a device driver
calls if_free(), and remains set if the refcount is elevated. IF_DYING
skips the bit in the if_flags bitmask previously used by IFF_NEEDSGIANT,
so that an MFC can be done without changing which bit is used, as
IFF_NEEDSGIANT is still present in 7.x.

ifnet_byindex_ref() checks for IFF_DYING and returns NULL if it is set,
preventing new references from by acquired by index, preventing
monitoring sysctls from seeing it. Other lookup mechanisms currently
do not check IFF_DYING, but may need to in the future.

MFC after: 3 weeks

Remove IFF_NEEDSGIANT interface flag: we no longer provide ifnet-layer
infrastructure to support non-MPSAFE network device drivers.

remove unnecessary forward declaration

Fix to bug kern/126850. Only dispatch event hander if the
interface had a parent (was attached).

Reviewed by: EvilSam
MFC after: 1 week

Trim some noise from some #ifdef's. This had leaked into the compat32
support for bpf(4) due to hacks in the Y! tree for a truss32 binary
(since superseded by native support for 32-bit binaries in truss itself).

MFC after: 1 week

Add IFF_NEEDSGIANT to IFF_CANTCHANGE, to prevent user-level code
from clearing the IFF_NEEDSGIANT flag on Giant-locked interfaces.
In particular, wpa_supplicant was doing this on USB interfaces,
causing panics when Giant-locked code was then called without Giant.

Submitted by: Alexey Popov
Reviewed by: rwatson
MFC after: 3 days

fix bonehead cut and paste error in last commit

Create separate capability flags for TCP over IPv4 and TCP over IPv6

add interface capability for TOE

Wake On Lan (WOL) infrastructure

Submitted by: Stefan Sperling <stsp@stsp.name>
Reviewed by: brooks

Add IFCAP_LRO flag for drivers to announce their TCP Large Receive Offload
capabilities.

The struct if_data members ifi_recvquota and ifi_xmitquota have been
unused for ages. Rename them to ifi_spare_char1 and ifi_spare_char2
respectively to indicate this face.

Fix a couple of typos in a comment.

First step of TSO (TCP segmentation offload) support in our network stack.

o add IFCAP_TSO[46] for drivers to announce this capability for IPv4 and IPv6
o add CSUM_TSO flag to mbuf pkthdr csum_flags field
o add tso_segsz field to mbuf pkthdr
o enhance ip_output() packet length check to allow for large TSO packets
o extend tcp_maxmtu[46]() with a flag pointer to pass interface capabilities
o adjust all callers of tcp_maxmtu[46]() accordingly

Discussed on: -current, -net
Sponsored by: TCP/IP Optimization Fundraise 2005

Improve description of if_capabilities, if_capenable and ifi_hwassist.

Sponsored by: TCP/IP Optimization Fundraise 2005

Import interface groups from OpenBSD. This allows to group interfaces in
order to - for example - apply firewall rules to a whole group of
interfaces. This is required for importing pf from OpenBSD 3.9

Obtained from: OpenBSD (with changes)
Discussed on: -net (back in April)

Remove various bits of conditional Alpha code and fixup a few comments.

Implement SIOCGIFCONF for 32bit binaries.

Merge the //depot/user/yar/vlan branch into CVS. It contains some collective
work by yar, thompsa and myself. The checksum offloading part also involves
work done by Mihail Balikov.

The most important changes:

o Instead of global linked list of all vlan softc use a per-trunk
hash. The size of hash is dynamically adjusted, depending on
number of entries. This changes struct ifnet, replacing counter
of vlans with a pointer to trunk structure. This change is an
improvement for setups with big number of VLANs, several interfaces
and several CPUs. It is a small regression for a setup with a single
VLAN interface.
An alternative to dynamic hash is a per-trunk static array with
4096 entries, which is a compile time option - VLAN_ARRAY. In my
experiments the array is not an improvement, probably because such
a big trunk structure doesn't fit into CPU cache.
o Introduce an UMA zone for VLAN tags. Since drivers depend on it,
the zone is declared in kern_mbuf.c, not in optional vlan(4) driver.
This change is a big improvement for any setup utilizing vlan(4).
o Use rwlock(9) instead of mutex(9) for locking. We are the first
ones to do this! :)
o Some drivers can do hardware VLAN tagging + hardware checksum
offloading. Add an infrastructure for this. Whenever vlan(4) is
attached to a parent or parent configuration is changed, the flags
on vlan(4) interface are updated.

In collaboration with: yar, thompsa
In collaboration with: Mihail Balikov <mihail.balikov interbgc.com>

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

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

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

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

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

/* -> /*- for license, minor formatting changes

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

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.

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.

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

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

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.

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

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

Added the new interface capability option for drivers that implement
user-configurable polling(4) support. Make ifconfig(8) aware of it.

Suggested by: luigi

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

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)

By popular demand, added the "static ARP" per-interface option.

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

style(9):
o Align members of struct if_nameindex.
o Align and sort function prototypes.

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').

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

Add IFF_POLLING into the list of flags which are protected from changing via
ioctl(SIOCSIFFLAGS).

MFC after: 1 day

Previous deltas (promisc mode) were a subject of:

MFC after: 1 week

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

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

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)

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)

Remove __P.

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

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

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

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

Add a SIOCGIFINDEX ioctl, which returns the index of a named interface.
This will be used to more efficiently support if_nametoindex(3).

Split HWCSUM into two components: RX and TX, for the benefit of drivers
which can only do checksum offloading in one direction.

Add two fields to the ifnet structure indicating what extra capabilities
a network device has, and which ones are enabled.

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

Add kernel infrastructure for network device cloning.

Reviewed by: ru, ume
Obtained from: NetBSD
MFC after: 1 week

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

Fix typo: compatability -> compatibility.

Compatability is not an existing english word.

Add support for offloading IP/TCP/UDP checksums to NIC hardware which
supports them.

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.

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

$Id$ -> $FreeBSD$

Fixed English errors, spelling errors and formatting errors in rev.1.51
and rev.1.53.

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

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.

Fix some disordering I introduced with the jail code.

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/

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

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).

Add a macro to accurately calculate the length of a struct ifreq when
it contains an address. This can replace all the myriad (wrong) ways
in which this task is performed in the current system. As an added
bonus, since it's a macro, then third-party software vendors have an easy
way to tell whether it's there or not. (This will become necessary
when sizeof(struct sockaddr) is increaased, and also when additional
fields are added to struct ifreq.)

Last major round (Unless Bruce thinks of somthing :-) of malloc changes.

Distribute all but the most fundamental malloc types. This time I also
remembered the trick to making things static: Put "static" in front of
them.

A couple of finer points by: bde

add SIOC{S,G}IFMEDIA ioctl support

Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Use the new if_multiaddrs list for multicast addresses rather than the
previous hackery involving struct in_ifaddr and arpcom. Get rid of the
abominable multi_kludge. Update all network interfaces to use the
new machanism. Distressingly few Ethernet drivers program the multicast
filter properly (assuming the hardware has one, which it usually does).

Separate kernel-internal data structures from exposed user interface
to interfaces. (Amazing nobody had done this!)

More commits to fix up user-land to follow.

Convert the interface address and IP interface address structures
to TAILQs. Fix places which referenced these for no good reason
that I can see (the references remain, but were fixed to compile
again; they are still questionable).

Use queue macros for the list of interfaces. Next stop: ifaddrs!

Include <net/if_arp.h> in the one header that requires it,
<netinet/if_ether.h>, rather than in <net/if.h>, most of whose callers
have no need of it.

Pointed-out-by: bde

Finally, after six years, remove the ``quick hack for SNMP'' that was
``going away soon''.

1) Implement SIOCSIFMTU in ether_ioctl(), and change ether_ioctl's return
type to be int so that errors can be returned.
2) Use the new SIOCSIFMTU ether_ioctl support in the few drivers that are
using ether_ioctl().
3) In if_fxp.c: treat if_bpf as a token, not as a pointer. Don't bother
testing for FXP_NTXSEG being reached in fxp_start()...just check for
non-NULL 'm'. Change fxp_ioctl() to use ether_ioctl().

Fix comments, which appear to have been mangled long ago and far away.

Removed nested include if <sys/socket.h> from <net/if.h> and
<net/if_arp.h> and fixed the things that depended on it. The nested
include just allowed unportable programs to compile and made my
simple #include checking program report that networking code doesn't
need to include <sys/socket.h>.

correct a field comment that someone must have accidentally spammed
as it's still used for what the original BSD4.4 comment says it's for.

Add a callback pointer to the interfaces "init" routine.
Add ether_ioctl() which can take care of the SIOC[SG]IFADDR cases for
most (ethernet) drivers.

Add better support for retrieving management information from network
interfaces. This creates two new tables in the net.link.generic branch
of the MIB; one contains (essentially) `ifdata' structures, and the other
contains a blob provided by the interface (and presumably used to
implement link-layer-specific MIB variables). A number of things
have been moved around in the `ifnet' and `ifdata' structures, so
NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple
recompile is all that's necessary.)

I have a sample program which uses this interface for those interested
in making use of it.

Fix a spelling error I forgot to bring over from my personal version
of the last (IF_ENQ_DROP) commit.

Add a new, better mechanism for sticking packets onto ifqueues.
The old system had the misfeature that the only policy it could implement
was tail-drop; the new IF_ENQ_DROP macro/function makes it possible
to implement more sophisticated queueing policies on a system-wide
basis. No code actually uses this yet (although on my machine
I have converted the ethernet and (polled) loopback to use it).

Change the use if ifnet.if_lastchange to be more in line with
SNMP requirements. Update description of ifnet.if_lastchange in if.h
to indicate this.

Clean up Ethernet drivers:
- fill in and use ifp->if_softc
- use if_bpf rather than private cookie variables
- change bpf interface to take advantage of this
- call ether_ifattach() directly from Ethernet drivers
- delete kludge in if_attach() that did this indirectly

Delete the if_private[] array in struct ifnet; this turned out to be
of limited utility. In their place, add bunch of pointers
which will eventually be needed by the polled-interrupt scheme we're working
here. (It will probably be a while before the code is written and
committed here.) At the same time, a `void *if_softc' field
was added to the beginning of the structure to make certain driver
writers happier.

The practical upshot of all this is that you need to
recompile utilities such as netstat which manipulate struct ifnet.

The last part of the ether_sprint -> %6D change.
Sorry for the delay.
(%D is for hexdumping.)

Staticize, clean lint.

all:
Removed ifnet.if_init and ifnet.if_reset as they are generally unused.
Change the parameter passed to if_watchdog to be a ifnet * rather than
a unit number. All of this is an attempt to move toward not needing an
array of softc pointers (which is usually static in size) to point to
the driver softc.

if_ed.c:
Changed some of the argument passing to some functions to make a little
more sense.

if_ep.c, if_vx.c:
Killed completely bogus use of if_timer. It was being set in such a way
that the interface was being reset once per second (blech!).

Say goodbye to IFF_NOTRAILERS. Support for trailers was officially
dropped for 4.4, but for some reason this flag lived on. (Until
today, that is.)

Add a few hooks (in the form of an array of four void *'s) to allow
various bits of software to save some data in the ifnet structure without
having to constantly change the declaration thereof.

Fix several sysinit functions that had the wrong type and unnecessarily
external linkage.

Remove useless comments saying that SYSINIT() does system initialization.

Make everything except the unsupported network sources compile cleanly
with -Wnested-externs.

Move some struct definitions outside of struct's, so their scopes for
C++ will match the scopes for C.

Submitted by: Warner Losh

Remove trailing whitespace.

Cleanup loopback interface support.
Reviewed by: wollman

Add and move declarations to fix all of the warnings from `gcc -Wimplicit'
(except in netccitt, netiso and netns) and most of the warnings from
`gcc -Wnested-externs'. Fix all the bugs found. There were no serious
ones.

Moved declaration of ifnet pointer out of the header file and into the
.c file where it belongs. Bezeroed some uninitialized malloc data.

Removed bogus semicolon at end of a #define line.

Add generic part of generic multiple-physical-interface support (the
successor of IFF_ALTPHYS).

Add a #define for if_rawoutput(), which isn't used now, but eventually will
be.

Add support for two separate cloning flags, one set by the lower layers,
and one set by the protocol family. Also add another parameter to
rtalloc1() to allow for any interface flags to be ignored; currently
this is only useful for RTF_PRCLONING. Get rid of rt_prflags and re-unite
with rt_flags. Add T/TCP ``route metrics''.

NB: YOU MUST RECOMPILE `route' AND OTHER RELATED PROGRAMS AS A RESULT OF
THIS CHANGE.

This also adds a new interface parameter, `ifi_physical', which will
eventually replace IFF_ALTPHYS as the mechanism for specifying the
particular physical connection desired on a multiple-connection card.

NB: YOU MUST RECOMPILE `ifconfig' AND OTHER RELATED PROGRAMS AS A RESULT OF
THIS CHANGE.

#include <socket.h> -> <sys/socket.h>

Include <sys/socket.h> for declaration of struct sockaddr. This helps
genassym compile when KERNEL is not defined.

Uniformize idempotency ifdef.

if.h:
Declare a complete prototype for the function pointer *ifa_rtrequest.

radix.h:
Declare a complete prototype for the function pointer *rnh_walktree
and for the function rn_walktree.

Uniformize idempotency ifdef.

Define IFF_ALTPHYS to be IFF_LINK2. Gross, but effective. (There aren't any
more bits left in if_flags and I don't want to make it a long this late in
the release cycle.)

Make idempotent.

Submitted by: Paul

Fix up some sloppy coding practices:

- Delete redundant declarations.
- Add -Wredundant-declarations to Makefile.i386 so they don't come back.
- Delete sloppy COMMON-style declarations of uninitialized data in
header files.
- Add a few prototypes.
- Clean up warnings resulting from the above.

NB: ioconf.c will still generate a redundant-declaration warning, which
is unavoidable unless somebody volunteers to make `config' smarter.

Added ioctl support for SIOCGIFMTU and SIOCSIFMTU. These set the per-
interface MTU.

Added $Id$

The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch.

Reviewed by: Rodney W. Grimes
Submitted by: John Dyson and David Greenman

This commit was generated by cvs2svn to compensate for changes in r1541,
which included commits to RCS files with non-trunk default branches.

BSD 4.4 Lite Kernel Sources