sys/netinet/icmp6.h: Fix build

Fix stdint.h file not found.

Fixes: 4b75afe885d4

sys/netinet/icmp6.h: use C99 uintX_t constants for new PREF64 struct

Reviewed by: imp, glebius (prior suggetions done)
Pull Request: https://github.com/freebsd/freebsd-src/pull/1206

netinet/icmp6: add PREF64 definitions (RFC 8781)

Reviewed by: imp, glebius (prior suggetions done)
Pull Request: https://github.com/freebsd/freebsd-src/pull/1206

netinet: add a probe point for IP, IP6, ICMP, ICMP6, UDP and TCP stats counters

When debugging network issues one common clue is an unexpectedly
incrementing error counter. This is helpful, in that it gives us an
idea of what might be going wrong, but often these counters may be
incremented in different functions.

Add a static probe point for them so that we can use dtrace to get
futher information (e.g. a stack trace).

For example:
dtrace -n 'mib:ip:count: { printf("%d", arg0); stack(); }'

This can be disabled by setting the following kernel option:
options KDTRACE_NO_MIB_SDT

Reviewed by: gallatin, tuexen (previous version), gnn (previous version)
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D43504

icmp6: move ICMPv6 related tunables to the files where they are used

Most of them can be declared as static after the move out of in6_proto.c.
Keeping sysctl(9) declarations with their text descriptions next to the
variable declaration create self-documenting code. There should be no
functional changes.

Differential Revision: https://reviews.freebsd.org/D44481

sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

sys: Remove $FreeBSD$: one-line .c comment pattern

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

pf: apply the network stack's ICMP rate limiting to ICMP errors sent by pf

PR: 266477
Event: Aberdeen Hackathon 2022
Differential Revision: https://reviews.freebsd.org/D36903

netinet*: remove PRC_ constants and streamline ICMP processing

In the original design of the network stack from the protocol control
input method pr_ctlinput was used notify the protocols about two very
different kinds of events: internal system events and receival of an
ICMP messages from outside. These events were coded with PRC_ codes.
Today these methods are removed from the protosw(9) and are isolated
to IPv4 and IPv6 stacks and are called only from icmp*_input(). The
PRC_ codes now just create a shim layer between ICMP codes and errors
or actions taken by protocols.

- Change ipproto_ctlinput_t to pass just pointer to ICMP header. This
allows protocols to not deduct it from the internal IP header.
- Change ip6proto_ctlinput_t to pass just struct ip6ctlparam pointer.
It has all the information needed to the protocols. In the structure,
change ip6c_finaldst fields to sockaddr_in6. The reason is that
icmp6_input() already has this address wrapped in sockaddr, and the
protocols want this address as sockaddr.
- For UDP tunneling control input, as well as for IPSEC control input,
change the prototypes to accept a transparent union of either ICMP
header pointer or struct ip6ctlparam pointer.
- In icmp_input() and icmp6_input() do only validation of ICMP header and
count bad packets. The translation of ICMP codes to errors/actions is
done by protocols.
- Provide icmp_errmap() and icmp6_errmap() as substitute to inetctlerrmap,
inet6ctlerrmap arrays.
- In protocol ctlinput methods either trust what icmp_errmap() recommend,
or do our own logic based on the ICMP header.

Differential revision: https://reviews.freebsd.org/D36731

mld6: use callout(9) directly instead of pr_slowtimo, pr_fasttimo

While here remove recursive network epoch entry in mld_fasttimo_vnet(),
as this function is already in epoch.

Reviewed by: melifaro
Differential revision: https://reviews.freebsd.org/D36161

netinet6: Fix mbuf leak in NDP

Mbufs leak when manually removing incomplete NDP records with pending packet via ndp -d.
It happens because lltable_drop_entry_queue() rely on `la_numheld`
counter when dropping NDP entries (lles). It turned out NDP code never
increased `la_numheld`, so the actual free never happened.

Fix the issue by introducing unified lltable_append_entry_queue(),
common for both ARP and NDP code, properly addressing packet queue
maintenance.

Reviewed By: melifaro
Differential Revision: https://reviews.freebsd.org/D35365
MFC after: 2 weeks

icmp6: Count packets dropped due to an invalid hop limit

Pad the icmp6stat structure so that we can add more counters in the
future without breaking compatibility again, last done in r358620.
Annotate the rarely executed error paths with __predict_false while
here.

Reviewed by: bz, melifaro
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D26578

Convert IP/IPv6 forwarding, ICMP processing and IP PCB laddr selection to
the new routing KPI.

Reviewed by: ae
Differential Revision: https://reviews.freebsd.org/D24245

Add new ICMPv6 counters for Anti-DoS limits.

Add four new counters for ND6 related Anti-DoS measures.
We split these out into a separate upfront commit so that we only
change the struct size one time. Implementations using them will
follow.

PR: 157410
Reviewed by: melifaro
MFC after: 2 weeks
X-MFC: cannot really MFC this without breaking netstat
Sponsored by: Netflix (initially)
Differential Revision: https://reviews.freebsd.org/D22711

White space cleanup -- remove trailing tab's or spaces
from any line.

Sponsored by: Netflix Inc.

Remove useless code from in6_rmx.c

The code in questions walks IPv6 tree every 60 seconds and looks into
the routes with non-zero expiration time (typically, redirected routes).
For each such route it sets RTF_PROBEMTU flag at the expiration time.
No other part of the kernel checks for RTF_PROBEMTU flag.

RTF_PROBEMTU was defined 21 years ago, 30 Jun 1999, as RTF_PROTO1.
RTF_PROTO1 is a de-facto standard indication of a route installed
by a routing daemon for a last decade.

Reviewed by: bz, ae
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D22865

Make icmp6_reflect() static.

icmp6_reflect() is not used anywhere outside icmp6.c, no reason to
export it.

Sponsored by: Netflix

Initial implementation of draft-ietf-6man-ipv6only-flag.

This change defines the RA "6" (IPv6-Only) flag which routers
may advertise, kernel logic to check if all routers on a link
have the flag set and accordingly update a per-interface flag.

If all routers agree that it is an IPv6-only link, ether_output_frame(),
based on the interface flag, will filter out all ETHERTYPE_IP/ARP
frames, drop them, and return EAFNOSUPPORT to upper layers.

The change also updates ndp to show the "6" flag, ifconfig to
display the IPV6_ONLY nd6 flag if set, and rtadvd to allow
announcing the flag.

Further changes to tcpdump (contrib code) are availble and will
be upstreamed.

Tested the code (slightly earlier version) with 2 FreeBSD
IPv6 routers, a FreeBSD laptop on ethernet as well as wifi,
and with Win10 and OSX clients (which did not fall over with
the "6" flag set but not understood).

We may also want to (a) implement and RX filter, and (b) over
time enahnce user space to, say, stop dhclient from running
when the interface flag is set. Also we might want to start
IPv6 before IPv4 in the future.

All the code is hidden under the EXPERIMENTAL option and not
compiled by default as the draft is a work-in-progress and
we cannot rely on the fact that IANA will assign the bits
as requested by the draft and hence they may change.

Dear 6man, you have running code.

Discussed with: Bob Hinden, Brian E Carpenter

Correct the comment describing badrs which is bad router solicitiation,
not bad router advertisement.

MFC after: 3 days

sys: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

Add missing constants from RFCs 4443 and 6550

Implement Enhanced DAD algorithm for IPv6 described in
draft-ietf-6man-enhanced-dad-13.

This basically adds a random nonce option (RFC 3971) to NS messages
for DAD probe to detect a looped back packet. This looped back packet
prevented DAD on some pseudo-interfaces which aggregates multiple L2 links
such as lagg(4).

The length of the nonce is set to 6 bytes. This algorithm can be disabled by
setting net.inet6.ip6.dad_enhanced sysctl to 0 in a per-vnet basis.

Reported by: hiren
Reviewed by: ae
Differential Revision: https://reviews.freebsd.org/D1835

Migrate structs in6_ifstat and icmp6_ifstat to PCPU counters.

Migrate structs ip6stat, icmp6stat and rip6stat to PCPU counters.

Prepare network statistics structures for migration to PCPU counters.
Use uint64_t as type for all fields of structures.

Changed structures: ahstat, arpstat, espstat, icmp6_ifstat, icmp6stat,
in6_ifstat, ip6stat, ipcompstat, ipipstat, ipsecstat, mrt6stat, mrtstat,
pfkeystat, pim6stat, pimstat, rip6stat, udpstat.

Discussed with: arch@

Use FF02:0:0:0:0:2:FF00::/104 prefix for IPv6 Node Information Group
Address. Although KAME implementation used FF02:0:0:0:0:2::/96 based on
older versions of draft-ietf-ipngwg-icmp-name-lookup, it has been changed
in RFC 4620.

The kernel always joins the /104-prefixed address, and additionally does
/96-prefixed one only when net.inet6.icmp6.nodeinfo_oldmcprefix=1.
The default value of the sysctl is 1.

ping6(8) -N flag now uses /104-prefixed one. When this flag is specified
twice, it uses /96-prefixed one instead.

Reviewed by: ume
Based on work by: Thomas Scheffler
PR: conf/174957
MFC after: 2 weeks

Correct typo in the RFC number for the constants based on IANA assignments
for IPv6 Neighbor Discovery Option types for "IPv6 Router Advertisement
Options for DNS Configuration". It is RFC 6106.

MFC after: 3 days

- Implement RDNSS and DNSSL options (RFC 6106, IPv6 Router Advertisement
Options for DNS Configuration) into rtadvd(8) and rtsold(8). DNS
information received by rtsold(8) will go to resolv.conf(5) by
resolvconf(8) script. This is based on work by J.R. Oldroyd (kern/156259)
but revised extensively[1].

- rtadvd(8) now supports "noifprefix" to disable gathering on-link prefixes
from interfaces when no "addr" is specified[2]. An entry in rtadvd.conf
with "noifprefix" + no "addr" generates an RA message with no prefix
information option.

- rtadvd(8) now supports RTM_IFANNOUNCE message to fix crashes when an
interface is added or removed.

- Correct bogus ND_OPT_ROUTE_INFO value to one in RFC 4191.

Reviewed by: bz[1]
PR: kern/156259 [1]
PR: bin/152458 [2]

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

MFC r207369:
MFP4: @176978-176982, 176984, 176990-176994, 177441

"Whitspace" churn after the VIMAGE/VNET whirls.

Remove the need for some "init" functions within the network
stack, like pim6_init(), icmp_init() or significantly shorten
others like ip6_init() and nd6_init(), using static initialization
again where possible and formerly missed.

Move (most) variables back to the place they used to be before the
container structs and VIMAGE_GLOABLS (before r185088) and try to
reduce the diff to stable/7 and earlier as good as possible,
to help out-of-tree consumers to update from 6.x or 7.x to 8 or 9.

This also removes some header file pollution for putatively
static global variables.

Revert VIMAGE specific changes in ipfilter::ip_auth.c, that are
no longer needed.

Reviewed by: jhb
Discussed with: rwatson
Sponsored by: The FreeBSD Foundation
Sponsored by: CK Software GmbH

MFP4: @176978-176982, 176984, 176990-176994, 177441

"Whitspace" churn after the VIMAGE/VNET whirls.

Remove the need for some "init" functions within the network
stack, like pim6_init(), icmp_init() or significantly shorten
others like ip6_init() and nd6_init(), using static initialization
again where possible and formerly missed.

Move (most) variables back to the place they used to be before the
container structs and VIMAGE_GLOABLS (before r185088) and try to
reduce the diff to stable/7 and earlier as good as possible,
to help out-of-tree consumers to update from 6.x or 7.x to 8 or 9.

This also removes some header file pollution for putatively
static global variables.

Revert VIMAGE specific changes in ipfilter::ip_auth.c, that are
no longer needed.

Reviewed by: jhb
Discussed with: rwatson
Sponsored by: The FreeBSD Foundation
Sponsored by: CK Software GmbH
MFC after: 6 days

Many network stack subsystems use a single global data structure to hold
all pertinent statatistics for the subsystem. These structures are
sometimes "borrowed" by kernel modules that require a place to store
statistics for similar events.

Add KPI accessor functions for statistics structures referenced by kernel
modules so that they no longer encode certain specifics of how the data
structures are named and stored. This change is intended to make it
easier to move to per-CPU network stats following 8.0-RELEASE.

The following modules are affected by this change:

if_bridge
if_cxgb
if_gif
ip_mroute
ipdivert
pf

In practice, most of these statistics consumers should, in fact, maintain
their own statistics data structures rather than borrowing structures
from the base network stack. However, that change is too agressive for
this point in the release cycle.

Reviewed by: bz
Approved by: re (kib)

Remove unused VNET_SET() and related macros; only VNET_GET() is
ever actually used. Rename VNET_GET() to VNET() to shorten
variable references.

Discussed with: bz, julian
Reviewed by: bz
Approved by: re (kensmith, kib)

Build on Jeff Roberson's linker-set based dynamic per-CPU allocator
(DPCPU), as suggested by Peter Wemm, and implement a new per-virtual
network stack memory allocator. Modify vnet to use the allocator
instead of monolithic global container structures (vinet, ...). This
change solves many binary compatibility problems associated with
VIMAGE, and restores ELF symbols for virtualized global variables.

Each virtualized global variable exists as a "reference copy", and also
once per virtual network stack. Virtualized global variables are
tagged at compile-time, placing the in a special linker set, which is
loaded into a contiguous region of kernel memory. Virtualized global
variables in the base kernel are linked as normal, but those in modules
are copied and relocated to a reserved portion of the kernel's vnet
region with the help of a the kernel linker.

Virtualized global variables exist in per-vnet memory set up when the
network stack instance is created, and are initialized statically from
the reference copy. Run-time access occurs via an accessor macro, which
converts from the current vnet and requested symbol to a per-vnet
address. When "options VIMAGE" is not compiled into the kernel, normal
global ELF symbols will be used instead and indirection is avoided.

This change restores static initialization for network stack global
variables, restores support for non-global symbols and types, eliminates
the need for many subsystem constructors, eliminates large per-subsystem
structures that caused many binary compatibility issues both for
monitoring applications (netstat) and kernel modules, removes the
per-function INIT_VNET_*() macros throughout the stack, eliminates the
need for vnet_symmap ksym(2) munging, and eliminates duplicate
definitions of virtualized globals under VIMAGE_GLOBALS.

Bump __FreeBSD_version and update UPDATING.

Portions submitted by: bz
Reviewed by: bz, zec
Discussed with: gnn, jamie, jeff, jhb, julian, sam
Suggested by: peter
Approved by: re (kensmith)

Add MLDv2 prototypes and defines.

Update stats in struct icmpstat and icmp6stat using four new
macros: ICMPSTAT_ADD(), ICMPSTAT_INC(), ICMP6STAT_ADD(), and
ICMP6STAT_INC(), rather than directly manipulating the fields
of these structures across the kernel. This will make it
easier to change the implementation of these statistics,
such as using per-CPU versions of the data structures.

In on case, icmp6stat members are manipulated indirectly, by
icmp6_errcount(), and this will require further work to fix
for per-CPU stats.

MFC after: 3 days

Second round of putting global variables, which were virtualized
but formerly missed under VIMAGE_GLOBAL.

Put the extern declarations of the virtualized globals
under VIMAGE_GLOBAL as the globals themsevles are already.
This will help by the time when we are going to remove the globals
entirely.

Sponsored by: The FreeBSD Foundation

- Import the HEAD csup code which is the basis for the cvsmode work.

- Disabled responding to NI queries from a global address by default as
specified in RFC4620. A new flag for icmp6_nodeinfo was added to enable the
feature.
- Also cleaned up the code so that the semantics of the icmp6_nodeinfo
flags is clearer (i.e., defined specific macro names instead of using
hard-coded values).

Approved by: gnn (mentor)
MFC after: 1 week

sync with KAME regarding NDP

- introduced fine-grain-timer to manage ND-caches and IPv6 Multicast-Listeners
- supports Router-Preference <draft-ietf-ipv6-router-selection-07.txt>
- better prefix lifetime management
- more spec-comformant DAD advertisement
- updated RFC/internet-draft revisions

Obtained from: KAME
Reviewed by: ume, gnn
MFC after: 2 month

scope cleanup. with this change
- most of the kernel code will not care about the actual encoding of
scope zone IDs and won't touch "s6_addr16[1]" directly.
- similarly, most of the kernel code will not care about link-local
scoped addresses as a special case.
- scope boundary check will be stricter. For example, the current
*BSD code allows a packet with src=::1 and dst=(some global IPv6
address) to be sent outside of the node, if the application do:
s = socket(AF_INET6);
bind(s, "::1");
sendto(s, some_global_IPv6_addr);
This is clearly wrong, since ::1 is only meaningful within a single
node, but the current implementation of the *BSD kernel cannot
reject this attempt.

Submitted by: JINMEI Tatuya <jinmei__at__isl.rdc.toshiba.co.jp>
Obtained from: KAME

add missing RFC3542 definition.

Submitted by: Keiichi SHIMA <keiichi__at__iijlab.net>
Obtained from: KAME

update comments:
- RFC2292bis -> RFC3542
- typo fixes

Submitted by: Keiichi SHIMA <keiichi__at__iijlab.net>
Obtained from: KAME

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

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

revert following unwanted changes:
- __packed to __attribute__((__packed__)
- uintN_t back to u_intN_t

Reported by: bde

Switch Advanced Sockets API for IPv6 from RFC2292 to RFC3542
(aka RFC2292bis). Though I believe this commit doesn't break
backward compatibility againt existing binaries, it breaks
backward compatibility of API.
Now, the applications which use Advanced Sockets API such as
telnet, ping6, mld6query and traceroute6 use RFC3542 API.

Obtained from: KAME

- add dom_if{attach,detach} framework.
- transition to use ifp->if_afdata.

Obtained from: KAME

nuke unused ICMPV6CTL_NAMES and KEYCTL_NAMES macros.

add /*CONSTCOND*/ to reduce diffs against latest KAME.

Obtained from: KAME

s/__attribute__((__packed__))/__packed/g

Revised MLD-related definitions
- Used mld_xxx and MLD_xxx instead of mld6_xxx and MLD6_xxx according
to the official defintions in rfc2292bis
(macro definitions for backward compatibility were provided)
- Changed the first member of mld_hdr{} from mld_hdr to mld_icmp6_hdr
to avoid name space conflict in C++

This change makes ports/net/pchar compilable again under -CURRENT.

Obtained from: KAME

just merged cosmetic changes from KAME to ease sync between KAME and FreeBSD.
(based on freebsd4-snap-20020128)

Reviewed by: ume
MFC after: 1 week

Remove __P.

- Renumber KAME local ICMP types and NDP options numberes beacaues they
are duplicated by newly defined types/options in RFC3121
- We have no backward compatibility issue. There is no apps in our
distribution which use the above types/options.

Obtained from: KAME
MFC after: 2 weeks

Sync with recent KAME.
This work was based on kame-20010528-freebsd43-snap.tgz and some
critical problem after the snap was out were fixed.
There are many many changes since last KAME merge.

TODO:
- The definitions of SADB_* in sys/net/pfkeyv2.h are still different
from RFC2407/IANA assignment because of binary compatibility
issue. It should be fixed under 5-CURRENT.
- ip6po_m member of struct ip6_pktopts is no longer used. But, it
is still there because of binary compatibility issue. It should
be removed under 5-CURRENT.

Reviewed by: itojun
Obtained from: KAME
MFC after: 3 weeks

sync with kame tree as of july00. tons of bug fixes/improvements.

API changes:
- additional IPv6 ioctls
- IPsec PF_KEY API was changed, it is mandatory to upgrade setkey(8).
(also syntax change)

Forbid include of soem inet6 header files from wrong place

KAME put INET6 related stuff into sys/netinet6 dir, but IPv6
standard API(RFC2553) require following files to be under sys/netinet.
netinet/ip6.h
netinet/icmp6.h
Now those header files just include each following files.
netinet6/ip6.h
netinet6/icmp6.h

Also KAME has netinet6/in6.h for easy INET6 common defs
sharing between different BSDs, but RFC2553 requires only
netinet/in.h should be included from userland.
So netinet/in.h also includes netinet6/in6.h inside.

To keep apps portability, apps should not directly include
above files from netinet6 dir.
Ideally, all contents of,
netinet6/ip6.h
netinet6/icmp6.h
netinet6/in6.h
should be moved into
netinet/ip6.h
netinet/icmp6.h
netinet/in.h
but to avoid big changes in this stage, add some hack, that
-Put some special macro define into those files under neitnet
-Let files under netinet6 cause error if it is included
from some apps, and, if the specifal macro define is not
defined.
(which should have been defined if files under netinet is
included)
-And let them print an error message which tells the
correct name of the include file to be included.

Also fix apps which includes invalid header files.

Approved by: jkh

Obtained from: KAME project

KAME netinet6 basic part(no IPsec,no V6 Multicast Forwarding, no UDP/TCP
for IPv6 yet)

With this patch, you can assigne IPv6 addr automatically, and can reply to
IPv6 ping.

Reviewed by: freebsd-arch, cvs-committers
Obtained from: KAME project