Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

MFC r271797: Make kernel to update LUN size from the backing storage
on configuration reload also if that size was not specified in the new
configuration.

Previously it happened only if size was explicitly changed in config.

Approved by: re (delphij)

MFC r271187:

Avoid ctld(8) crash on getaddrinfo(3) failure.

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

MFC r271169:

Turn two errors, which are possible to trigger only by bugs,
into assertions.

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

MFC r270279:

Make the iSCSI stack use __FBSDID() properly.

Sponsored by: The FreeBSD Foundation

MFC r269183, r269191:
Add netmasks support to initiator-portal option.

MFC r268291:
Create separate CTL port for every iSCSI target (and maybe portal group).

Having single port for all iSCSI connections makes problematic implementing
some more advanced SCSI functionality in CTL, that require proper ports
enumeration and identification.

This change extends CTL iSCSI API, making ctld daemon to control list of
iSCSI ports in CTL. When new target is defined in config fine, ctld will
create respective port in CTL. When target is removed -- port will be
also removed after all active commands through that port properly aborted.
This change require ctld to be rebuilt to match the kernel.

As a minor side effect, this allows to have iSCSI targets without LUNs.
While that may look odd and not very useful, that is not incorrect.

MFC r264535:

English.

Sponsored by: The FreeBSD Foundation

MFC r264534:

If we fail to create LUN, try again on next configuration reload.

Sponsored by: The FreeBSD Foundation

MFC r264533:

Use consistent punctuation.

Sponsored by: The FreeBSD Foundation

MFC r264531:

Constify.

Sponsored by: The FreeBSD Foundation

MFC r264530:

Properly pass the initiator address when running in proxy mode.

Sponsored by: The FreeBSD Foundation

MFC r264529:

Use socket address from accept(2) instead of retrieving it via
getpeername(2).

Sponsored by: The FreeBSD Foundation

MFC r264528:

Rework the way we enable CTL iSCSI port. Previously conf_apply()
needed it to be already enabled, because listening in proxy mode
requires it; however, it's conf_apply() that opens pidfiles,
so it resulted in port being enabled before pidfile was opened.
This was not so bad, but it was also disabled when pidfile couldn't
be opened due to ctld already running; this means that starting
second ctld instance screwed up the first.

Sponsored by: The FreeBSD Foundation

MFC r264526:

Properly identify target portal when running in proxy mode. While here,
remove CTL_ISCSI_CLOSE, it wasn't used or implemented anyway.

Sponsored by: The FreeBSD Foundation

MFC r264524:

Make it possible for the iSCSI target side to operate in both normal
and ICL_KERNEL_PROXY mode, and fix some bit rot so the latter actually
works again.

Sponsored by: The FreeBSD Foundation

MFC r264500:

Stop treating LUN 0 as mandatory. There is no reason to do that.

Sponsored by: The FreeBSD Foundation

MFC r261764:

So, it turns out SIGCHLD is discarded by default, so we have to set up
a dummy handler to make it interrupt an ioctl(2) or select(2).

This makes those short-lived ctld(8) zombies disappear.

Sponsored by: The FreeBSD Foundation

MFC r261763:

Use new auth-type "deny" instead of using "chap" with no chap entries;
it's cleaner this way, and gives better feedback to the user.

Sponsored by: The FreeBSD Foundation

MFC r261762:

Use "default" as default discovery-auth-group, instead of "no-access".
It doesn't change visible behaviour, as previously auth-group "default"
wasn't redefinable, so by default access was always denied.

Sponsored by: The FreeBSD Foundation

MFC r261760:

Add a new auth-group "default", defaulting to deny, and make it possible
to redefine it. From now on, assigning auth-group to a target is no longer
mandatory.

Sponsored by: The FreeBSD Foundation

MFC r261758:

Add auth-type.

Sponsored by: The FreeBSD Foundation

MFC r261757:

Rename a variable, no functional changes.

Sponsored by: The FreeBSD Foundation

MFC r261755:

Make function ordering slightly more logical; no functional changes.

Sponsored by: The FreeBSD Foundation

MFC r261754:

Implement initiator-name and initiator-portal restrictions.

Sponsored by: The FreeBSD Foundation

MFC r261753:

Daemonize after applying configuration, not before, so that
any problems - including "daemon already running" - are visible
on the terminal and not just in logs.

Sponsored by: The FreeBSD Foundation

MFC r261750:

Improve check for duplicated paths. It shows the warning twice for every
path (once for each duplicate found), but it should do for now.

Sponsored by: The FreeBSD Foundation

MFC r261749:

Refactor.

Sponsored by: The FreeBSD Foundation

MFC r261768:

Make the debug messages during ctld(8) shutdown less confusing.

Sponsored by: The FreeBSD Foundation

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

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

Fix several problems in the new iSCSI stack; this includes interoperability
fix for LIO (Linux target), removing possibility for the target to avoid mutual
CHAP by choosing to skip authentication altogether, and fixing truncated error
messages in iscsictl(8) output. This also fixes several of the problems found
with Coverity.

Note that this change requires world rebuild.

Coverity CID: 1088038, 1087998, 1087990, 1088004, 1088044, 1088041, 1088040
Approved by: re (blanket)
Sponsored by: FreeBSD Foundation

Bring in the new iSCSI target and initiator.

Reviewed by: ken (parts)
Approved by: re (delphij)
Sponsored by: FreeBSD Foundation