The r48589 promised to remove implicit inclusion of if_var.h soon. Prepare
to this event, adding if_var.h to files that do need it. Also, include
all includes that now are included due to implicit po

The r48589 promised to remove implicit inclusion of if_var.h soon. Prepare
to this event, adding if_var.h to files that do need it. Also, include
all includes that now are included due to implicit pollution via if_var.h

Sponsored by: Netflix
Sponsored by: Nginx, Inc.

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Merge head r233826 through r256722.

- Utilize counter(9) to accumulate statistics on interface addresses. Add
four counters to struct ifaddr. This kills '+=' on a variables shared
between processors for every packet.
- Nuke struct

- Utilize counter(9) to accumulate statistics on interface addresses. Add
four counters to struct ifaddr. This kills '+=' on a variables shared
between processors for every packet.
- Nuke struct if_data from struct ifaddr.
- In ip_input() do not put a reference on ifaddr, instead update statistics
right now in place and do IN_IFADDR_RUNLOCK(). These removes atomic(9)
for every packet. [1]
- To properly support NET_RT_IFLISTL sysctl used by getifaddrs(3), in
rtsock.c fill if_data fields using counter_u64_fetch().
- Accidentially fix bug in COMPAT_32 version of NET_RT_IFLISTL, which
took if_data not from the ifaddr, but from ifaddr's ifnet. [2]

Submitted by: melifaro [1], pluknet[2]
Sponsored by: Netflix
Sponsored by: Nginx, Inc.

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Remove useless check of ia6 against NULL, right after dereferencing it.

Merge head@256284

IFC @256277

Approved by: ken (mentor)

MFC - tracking update.

IFC @ r255692

Comment out IA32_MISC_ENABLE MSR access - this doesn't exist on AMD.
Need to sort out how arch-specific MSRs will be handled.

Unregister inet/inet6 pfil hooks on vnet destroy.

Discussed with: andre
Approved by: re (rodrigc)

Merge from head

IFC @ r255209

MFC

Implement the ip, tcp, and udp DTrace providers. The probe definitions use
dynamic translation so that their arguments match the definitions for
these providers in Solaris and illumos. Thus, existing

Implement the ip, tcp, and udp DTrace providers. The probe definitions use
dynamic translation so that their arguments match the definitions for
these providers in Solaris and illumos. Thus, existing scripts for these
providers should work unmodified on FreeBSD.

Tested by: gnn, hiren
MFC after: 1 month

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IFC @ r254014

IFC @ r253461

IFC @253398

Migrate structs ip6stat, icmp6stat and rip6stat to PCPU counters.

Merge fresh head.

Use IP6S_M2MMAX macro.

sync from head

Use IP6STAT_INC/IP6STAT_DEC macros to update ip6 stats.

MFC after: 1 week

MFC @248461

- Use m_getcl() instead of hand allocating.
- Do not calculate constant length values at run time,
CTASSERT() their sanity.
- Remove superfluous cleaning of mbuf fields after allocation.
- Replace

- Use m_getcl() instead of hand allocating.
- Do not calculate constant length values at run time,
CTASSERT() their sanity.
- Remove superfluous cleaning of mbuf fields after allocation.
- Replace compat macros with function calls.

Sponsored by: Nginx, Inc.

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Use m_getcl() instead of hand made allocation.

Sponsored by: Nginx, Inc.

IFC @247348.