Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Mechanically substitute flags from historic mbuf allocator with
malloc(9) flags within sys.

Exceptions:

- sys/contrib not touched
- sys/mbuf.h edited manually

Mechanically remove the last stray remains of spl* calls from net*/*.
They have been Noop's for a long time now.

#include <net/vnet.h> is no longer needed here.

Spotted by: Ed Maste
MFC after: 3 days.

Node constructor methods are supposed to be called in syscall
context always. Convert nodes to consistently use M_WAITOK flag
for memory allocation.

Reviewed by: julian

Fix typos - remove duplicate "the".

PR: bin/154928
Submitted by: Eitan Adler <lists at eitanadler.com>
MFC after: 3 days

Remove email address that no longer exists.

Merge the remainder of kern_vimage.c and vimage.h into vnet.c and
vnet.h, we now use jails (rather than vimages) as the abstraction
for virtualization management, and what remained was specific to
virtual network stacks. Minor cleanups are done in the process,
and comments updated to reflect these changes.

Reviewed by: bz
Approved by: re (vimage blanket)

Fix error message content.

Approved by: julian (mentor)
MFC after: 3 days

Commit step 1 of the vimage project, (network stack)
virtualization work done by Marko Zec (zec@).

This is the first in a series of commits over the course
of the next few weeks.

Mark all uses of global variables to be virtualized
with a V_ prefix.
Use macros to map them back to their global names for
now, so this is a NOP change only.

We hope to have caught at least 85-90% of what is needed
so we do not invalidate a lot of outstanding patches again.

Obtained from: //depot/projects/vimage-commit2/...
Reviewed by: brooks, des, ed, mav, julian,
jamie, kris, rwatson, zec, ...
(various people I forgot, different versions)
md5 (with a bit of help)
Sponsored by: NLnet Foundation, The FreeBSD Foundation
X-MFC after: never
V_Commit_Message_Reviewed_By: more people than the patch

Ensure message passed to "settimestamp" and "setcounter" is the right
length. Use NULL instead of 0.

Submitted by: glebius, ru

Add "setcounter" and "getcounter" messages, providing the the ability
to embed up to four counters in outgoing packets. The message specifies
the offset at which the counter should be inserted as well as the
parameters of the counter.

Example usage:

ngctl msg src0: setcounter \
'{ index=0 offset=0x40 flags=1 width=4 increment=1 max_val=12345 }'

Sponsored by: Sandvine Incorporated

Add "settimestamp" and "gettimestamp" messages, providing the the ability
to embed a timestamp (struct timeval) in outgoing packets. The message
specifies the offset at which the timestamp should be inserted.

NG_SOURCE(4) gives an example usage that queues an ICMP packet. Using that
example, the following command will insert a timestamp in the ICMP's data
payload:

ngctl msg src0: settimestamp '{ offset=0x2a flags=1 }'

Sponsored by: Sandvine Incorporated

Simplify ng_source_send() removing temporary queue and merging two
cycles into one.

Implement an upper limit for packets per second sent by node.

Major overhaul and cleanup of ng_source node.

Functional changes:
- Cut struct source_hookinfo. Just use hook_p pointer.
- Remove "start_now" command. "start" command now requires number of
packets to send as argument. "start" command actually starts sending.
Move the code that actually starts sending from ng_source_rcvmsg()
to ng_source_start().
- Remove check for NG_SOURCE_ACTIVE in ng_source_stop(). We can be called
with flag cleared (see begin of ng_source_intr()).
- If NG_SEND_DATA_ONLY() use log(LOG_DEBUG) instead of printf(). Otherwise
we will *flood* console.
- Add ng_connect_t method, which sends NGM_ETHER_GET_IFNAME command
to "output" hook. Cut ng_source_request_output_ifp(). Refactor
ng_source_store_output_ifp() to use ifunit() and don't muck through
interface list.
- Add "setiface" command, which gives ability to configure interface
in case when ng_source_connect() failed. This happens, when we are not
connected directly to ng_ether(4) node.
- Remove KASSERTs, which can never fire.
- Don't check for M_PKTHDR in rcvdata method. netgraph(4) does this
for us.

Style:
- Assign sc_p = NG_NODE_PRIVATE(node) in declaration, to be
consistent with style of other nodes.
- Sort variables.
- u_intXX -> uintXX.
- Dots at ends of comments.

Sponsored by: Rambler

Make some basic grammar and style fixes to ng_source.c and ng_source.h.
The latter was particularly violated by someone's editor in the past, due
to an effect I like to call "premature linewrapping."

Fallout from the ALTQ import.

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

Mechanically rename s/ng_timeout/ng_callout/g, s/ng_untimeout/ng_uncallout/g.
This is done to keep both versions in RELENG_5 and support both APIs.

Reviewed by: scottl
Approved by: julian (mentor), implicitly

- Make ng_timeout() to use callout() interface instead of timeout().
- Remove callout-hacking from ng_untimeout().

Approved by: julian (mentor)
MFC after: 1 month

Fix a harmless error in order of ng_timeout() arguments.

Approved by: julian (mentor)

Slight cosmetic changes.
Also introduce a macro to be called by persistent nodes to signal their
persistence during shutdown to hide this mechanism from the node author.

Make node flags have a consistent style in naming.

Document the change.

Switch to using C99 sparse initialisers for the type methods array.
Should make no binary difference.

Submitted by: Gleb Smirnoff <glebius@cell.sick.ru>
Reviewed by: Harti Brandt <harti@freebsd.org>
MFC after: 1 week

Use the official ng_timeout function to trigger sending. This means,
that we can get rid of of all the spl*() calls, because ng_timeout
handles the locking issues.

Don't confuse NULL and 0, use 0 where an integer is expected.

Style: add __FBSDID, relocate some { that were on the wrong line,
correct some indendation, change __FUNCTION__ to __func__ and remove
a local KASSERT definition.

Make ng_source to work with non-ethernet interfaces. We do this by
introducing a START_NOW command. This command does not send
and GET_IFINDEX message downstream (to wait for the response from
the ETHERNET node), but directly starts the sending process. This allows
one to generate traffic as input for any hook on any node.

Declare a function to silence a warning.

Should use the non-locking versions of the ifqueue macros to
fiddle around with private queues, because their mutex is not
needed. All this processing should be protected by the netgraph
locking.

Replace a call to bzero() with an M_ZERO flag. Replace the MALLOC() with
malloc().

The version in the type description must be the ABI version, not
the netgraph version.

Correct the return type of a function: it wants to return an error
code, so it cannot be void.

Back out M_* changes, per decision of the TRB.

Approved by: trb

Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.

SMP locking for ifnet list.

o Untangle the confusion with the malloc flags {M_WAITOK, M_NOWAIT} and
the mbuf allocator flags {M_TRYWAIT, M_DONTWAIT}.
o Fix a bpf_compat issue where malloc() was defined to just call
bpf_alloc() and pass the 'canwait' flag(s) along. It's been changed
to call bpf_alloc() but pass the corresponding M_TRYWAIT or M_DONTWAIT
flag (and only one of those two).

Submitted by: Hiten Pandya <hiten@unixdaemons.com> (hiten->commit_count++)

Slight redesign for fitting in with -current.

The easy part of converting the ng_source node to -current.
More to come.. does not compile (deliberatly.. logic broken)

Whitespace fixes

Add the netgraph 'source' module.
This is NOT YET CONVERTED TO -current.
This node is a source for preprogrammed packets at a known rate for testing.

I will convert it to -current "in place" but will MFC teh original
pre-conversion variant as that is what is originally submitted.
Man page my me, info from Dave's README.

Submitted by: Dave Chapeskie <dchapeskie@SANDVINE.com>
Obtained from: Sandvine inc.
MFC after: 1 week