kernel: Remove the COMPAT_43 kernel option along with all related code.

It is commented out in our default kernel config files for almost five
years now, since 9466f37df5258f3bc3d99ae43627a71c1c085e

kernel: Remove the COMPAT_43 kernel option along with all related code.

It is commented out in our default kernel config files for almost five
years now, since 9466f37df5258f3bc3d99ae43627a71c1c085e7d.

Approved-by: dillon
Dragonfly-bug: <https://bugs.dragonflybsd.org/issues/2946>

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inet/inet6: Remove the v4-mapped address support

This greatly simplies the code (even the IPv4 code) and avoids all kinds
of possible port theft.

INPCB:
- Nuke IN6P_IPV6_V6ONLY, which is always on

inet/inet6: Remove the v4-mapped address support

This greatly simplies the code (even the IPv4 code) and avoids all kinds
of possible port theft.

INPCB:
- Nuke IN6P_IPV6_V6ONLY, which is always on after this commit.
- Change inp_vflag into inp_af (AF_INET or AF_INET6), since the socket
is either IPv6 or IPv4, but never both. Set inpcb.inp_af in
in_pcballoc() instead of in every pru_attach methods. Add INP_ISIPV4()
and INP_ISIPV6() macros to check inpcb family (socket family and
inpcb.inp_af are same).
- Nuke the convoluted code in in_pcbbind() and in6_pcbbind() which is used
to allow wildcard binding to accepting IPv4 connections on IPv6 wildcard
bound sockets.
- Nuke the code in in_pcblookup_pkthash() to match IPv4 faddr with IPv6
wildcard bound socket.
- Nuke in6_mapped_{peeraddr,sockaddr,savefaddr}(); use in6_{setpeeraddr,
setsockaddr,savefaddr}() directly.
- Nuke v4-mapped address convertion functions.
- Don't allow binding to v4-mapped address in in6_pcbind().
- Don't allow connecting to v4-mapped address in in6_pcbconnect().

TCP:
- Nuke the code in tcp_output() which takes care of the IP header TTL
setting for v4-mapped IPv6 socket.
- Don't allow binding to v4-mapped address (through in6_pcbbind()).
- Don't allow connecting to v4-mapped address and nuke the related code
(PRUC_NAMALLOC etc.).
- Nuke the code (PRUC_FALLBACK etc.) to fallback to IPv4 connection if
IPv6 connection fails, which is wrong.
- Nuke the code for v4-mapped IPv6 socket in tcp6_soport().

UDP:
- Nuke the code for v4-mapped IPv6 socket in udp_input() and udp_append().
- Don't allow binding to v4-mapped address (through in6_pcbbind()).
- Don't allow connecting to v4-mapped address.
- Don't allow sending datagrams to v4-mapped address and nuke the related
code in udp6_output().
- Nuke the code for v4-mapped IPv6 socket in udp6_disconnect()

RIP:
- Don't allow sending packets to v4-mapped address.
- Don't allow binding to v4-mapped address.
- Don't allow connecting to v4-mapped address.

Misc fixup:
- Don't force rip pru_attach method to return 0. If in_pcballoc() fails,
just return the error code.

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tcp: Use lwkt_sendmsg_oncpu to run TCP timers in the current CPU's netisr

Correct BSD License clause numbering from 1-2-4 to 1-2-3.

Apparently everyone's doing it:
http://svnweb.freebsd.org/base?view=revision&revision=251069

Submitted-by: "Eitan Adler" <lists at eitanadl

Correct BSD License clause numbering from 1-2-4 to 1-2-3.

Apparently everyone's doing it:
http://svnweb.freebsd.org/base?view=revision&revision=251069

Submitted-by: "Eitan Adler" <lists at eitanadler.com>

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Remove advertising clause from all that isn't contrib or userland bin.

By: Eitan Adler <lists@eitanadler.com>

Merge branch 'master' of git://git.dragonflybsd.org/dragonfly into wlan_serialize

kernel - Beef up lwkt_dropmsg() API and fix deadlock in so_async_rcvd*()

* Beef up the lwkt_dropmsg() API. The API now conditionally returns
success (0) or an error (ENOENT).

* so_pru_rcvd_async

kernel - Beef up lwkt_dropmsg() API and fix deadlock in so_async_rcvd*()

* Beef up the lwkt_dropmsg() API. The API now conditionally returns
success (0) or an error (ENOENT).

* so_pru_rcvd_async() improperly calls lwkt_sendmsg() with a spinlock
held. This is not legal. Hack up lwkt_sendmsg() a bit to resolve.

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Merge branches 'hammer2' and 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly into hammer2

tcp/sack: Discard HighRxt, RescueRxt and LostSeq along with SACK scoreboard

Merge branches 'hammer2' and 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly into hammer2

tcp: Don't let fast retransmit disrupt RTO rebasing

While im here, add and adjust comment about spurious timeout retransmit
detection.

Merge branches 'hammer2' and 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly into hammer2

tcp: Add rxt_flags for spurious retransmit detection

This saves another 5 bits in the t_flags

tcp: Add sack_flags for SACK related operations

This saves us 4 bits in the crowded t_flags

Merge branches 'hammer2' and 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly into hammer2

tcp: Implement part of Eifel Response Algorithm (RFC4015)

It adapts the retransmission timer to avoid further spurious timeouts.

tcp: Update snd_last upon spurious timeout retransmission restore

According to RFC4015; mainly to avoid delay spike.

Merge branches 'hammer2' and 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly into hammer2

tcp: Implement "Rescue Retransmission for SACK-based Loss Recovery Algorithm"

http://tools.ietf.org/html/draft-nishida-tcpm-rescue-retransmission-00

When hsu@ implemented RFC3517, part of the fix m

tcp: Implement "Rescue Retransmission for SACK-based Loss Recovery Algorithm"

http://tools.ietf.org/html/draft-nishida-tcpm-rescue-retransmission-00

When hsu@ implemented RFC3517, part of the fix mentioned in the above draft
had been implemented, i.e. no SACK scoreboard left case, as mentioned in the
above draft as example. However, the original implementation still did not
cover the case when there are small amount of SACK scoreboards left (< 3),
and the original implmentation could be more aggressive than the method
suggested in the above draft.

- Whether to use this new mechanism is controlled by net.inet.tcp.rescuesack
sysctl node; it is on by default. Disable it will fallback to the original
rescue retransmission behaviour implemented by hsu@.
- Save rexmt_high, before we start retransmission using RFC3517, so if nothing
is sent, rexmt_high could be restored.
- Add statistics about rescue retransmission.

We could futher examine whether do more than one rescue retransmission could
be helpful or not.

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Merge branches 'hammer2' and 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly into hammer2

tcp: Reimplement TCP_FASTKEEP socket option using per-pcb keepidle

Retired now used TF_FASTKEEP

Merge branches 'hammer2' and 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly into hammer2

tcp: "Reasonably" reduce IW after SYN retransmition timeout

Merge branches 'hammer2' and 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly into hammer2

tcp: Adjust SYN retransmit backoff a little bit.

This pattern is proposed by:
Chu, J., "Tuning TCP Parameters for the 21st Century",
http://www.ietf.org/proceedings/75/slides/tcpm-1.pdf