Merge from head

Sponsored by: Gandi.net

Finish merging from head, messed up in previous attempt

Catch up with head, primarily for the 1.14.4.0 firmware.

Merge ^/head r285924 through r286421.

Properly handle IPV6_NEXTHOP socket option in selectroute().

o remove disabled code;
o if nexthop address is link-local, use embedded scope zone id to
determine outgoing interface;
o properly

Properly handle IPV6_NEXTHOP socket option in selectroute().

o remove disabled code;
o if nexthop address is link-local, use embedded scope zone id to
determine outgoing interface;
o properly fill ro_dst before doing route lookup;
o remove LLE lookup, instead check rt_flags for RTF_GATEWAY bit.

Sponsored by: Yandex LLC

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Remove redundant check.

Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock.

Both are used to protect access to IP addresses lists and they can be
acquired for reading several times per packet. To reduce lock contention
i

Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock.

Both are used to protect access to IP addresses lists and they can be
acquired for reading several times per packet. To reduce lock contention
it is better to use rmlock here.

Reviewed by: gnn (previous version)
Obtained from: Yandex LLC
Sponsored by: Yandex LLC
Differential Revision: https://reviews.freebsd.org/D3149

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Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Sync to HEAD@r274766

Simplify API: use new NHOP_LOOKUP_AIFP flag to select what ifp
we need to return.
Rename fib[64]_lookup_nh_basic to fib[64]_lookup_nh, add flags
fields for all relevant functions.

Merge from head@274682

For now handle only multicast addresses, we still use routes to
LLA unicasts yet.

Sponsored by: Yandex LLC

Use embedded scope zone id to determine outgoing interface for link-local
and node-local addresses.

Convert netinet6/ to use new routing API.

* Remove &ifpp from ip6_output() in favor of ri->ri_nh_info
* Provide different wrappers to in6_selectsrc:
Currently it is used by 2 differenct type of cu

Convert netinet6/ to use new routing API.

* Remove &ifpp from ip6_output() in favor of ri->ri_nh_info
* Provide different wrappers to in6_selectsrc:
Currently it is used by 2 differenct type of customers:
- socket-based one, which all are unsure about provided
address scope and
- in-kernel ones (ND code mostly), which don't have
any sockets, options, crededentials, etc.
So, we provide two different wrappers to in6_selectsrc()
returning select source.
* Make different versions of selectroute():
Currenly selectroute() is used in two scenarios:
- SAS, via in6_selecsrc() -> in6_selectif() -> selectroute()
- output, via in6_output -> wrapper -> selectroute()
Provide different versions for each customer:
- fib6_lookup_nh_basic()-based in6_selectif() which is
capable of returning interface only, without MTU/NHOP/L2
calculations
- full-blown fib6_selectroute() with cached route/multipath/
MTU/L2
* Stop using routing table for link-local address lookups
* Add in6_ifawithifp_lla() to make for-us check faster for link-local
* Add in6_splitscope / in6_setllascope for faster embed/deembed scopes

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Convert several places inside netinet6/ to new api.

Sync to HEAD@r272516.

IFC @r271694

Add the ability to set `prefer_source' flag to an IPv6 address.
It affects the IPv6 source address selection algorithm (RFC 6724)
and allows override the last rule ("longest matching prefix") for
cho

Add the ability to set `prefer_source' flag to an IPv6 address.
It affects the IPv6 source address selection algorithm (RFC 6724)
and allows override the last rule ("longest matching prefix") for
choosing among equivalent addresses. The address with `prefer_source'
will be preferred source address.

Obtained from: Yandex LLC
MFC after: 1 month
Sponsored by: Yandex LLC

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Sync to HEAD@r271160.

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Add the reverse part to rule #9. Also change its description in the
netstat(8) output.

MFC after: 1 week

Sync to HEAD@r269943.

Add new rule to source address selection algorithm. It prefers address
with better virtual status. Use ifa_preferred() to choose better address.

PR: 187341
Tested by: des
MFC after: 1 week

MFC @ r266724

An SVM update will follow this.