Merge projects/ipsec into head/.

 Small summary
 -------------

o Almost all IPsec releated code was moved into sys/netipsec.
o New kernel modules added: ipsec.ko and tcpmd5.ko. New kernel
  option IPSEC_SUPPORT added. It enables support for loading
  and unloading of ipsec.ko and tcpmd5.ko kernel modules.
o IPSEC_NAT_T option was removed. Now NAT-T support is enabled by
  default. The UDP_ENCAP_ESPINUDP_NON_IKE encapsulation type
  support was removed. Added TCP/UDP checksum handling for
  inbound packets that were decapsulated by transport mode SAs.
  setkey(8) modified to show run-time NAT-T configuration of SA.
o New network pseudo interface if_ipsec(4) added. For now it is
  build as part of ipsec.ko module (or with IPSEC kernel).
  It implements IPsec virtual tunnels to create route-based VPNs.
o The network stack now invokes IPsec functions using special
  methods. The only one header file <netipsec/ipsec_support.h>
  should be included to declare all the needed things to work
  with IPsec.
o All IPsec protocols handlers (ESP/AH/IPCOMP protosw) were removed.
  Now these protocols are handled directly via IPsec methods.
o TCP_SIGNATURE support was reworked to be more close to RFC.
o PF_KEY SADB was reworked:
  - now all security associations stored in the single SPI namespace,
    and all SAs MUST have unique SPI.
  - several hash tables added to speed up lookups in SADB.
  - SADB now uses rmlock to protect access, and concurrent threads
    can do SA lookups in the same time.
  - many PF_KEY message handlers were reworked to reflect changes
    in SADB.
  - SADB_UPDATE message was extended to support new PF_KEY headers:
    SADB_X_EXT_NEW_ADDRESS_SRC and SADB_X_EXT_NEW_ADDRESS_DST. They
    can be used by IKE daemon to change SA addresses.
o ipsecrequest and secpolicy structures were cardinally changed to
  avoid locking protection for ipsecrequest. Now we support
  only limited number (4) of bundled SAs, but they are supported
  for both INET and INET6.
o INPCB security policy cache was introduced. Each PCB now caches
  used security policies to avoid SP lookup for each packet.
o For inbound security policies added the mode, when the kernel does
  check for full history of applied IPsec transforms.
o References counting rules for security policies and security
  associations were changed. The proper SA locking added into xform
  code.
o xform code was also changed. Now it is possible to unregister xforms.
  tdb_xxx structures were changed and renamed to reflect changes in
  SADB/SPDB, and changed rules for locking and refcounting.

Reviewed by:	gnn, wblock
Obtained from:	Yandex LLC
Relnotes:	yes
Sponsored by:	Yandex LLC
Differential Revision:	https://reviews.freebsd.org/D9352

1 files changed, 9 insertions, 15 deletions

diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4
index b3139e74d4e1..6b94866a2b31 100644
--- a/share/man/man4/tcp.4
+++ b/share/man/man4/tcp.4
@@ -34,7 +34,7 @@
 .\"     From: @(#)tcp.4	8.1 (Berkeley) 6/5/93
 .\" $FreeBSD$
 .\"
-.Dd Jan 29, 2017
+.Dd February 6, 2017
 .Dt TCP 4
 .Os
 .Sh NAME
@@ -272,33 +272,27 @@ or the internal send buffer is filled.
 This option enables the use of MD5 digests (also known as TCP-MD5)
 on writes to the specified socket.
 Outgoing traffic is digested;
-digests on incoming traffic are verified if the
-.Va net.inet.tcp.signature_verify_input
-sysctl is nonzero.
-The current default behavior for the system is to respond to a system
-advertising this option with TCP-MD5; this may change.
+digests on incoming traffic are verified.
+When this option is enabled on a socket, all inbound and outgoing
+TCP segments must be signed with MD5 digests.
 .Pp
 One common use for this in a
 .Fx
 router deployment is to enable
 based routers to interwork with Cisco equipment at peering points.
 Support for this feature conforms to RFC 2385.
-Only IPv4
-.Pq Dv AF_INET
-sessions are supported.
 .Pp
 In order for this option to function correctly, it is necessary for the
 administrator to add a tcp-md5 key entry to the system's security
 associations database (SADB) using the
 .Xr setkey 8
 utility.
-This entry must have an SPI of 0x1000 and can therefore only be specified
-on a per-host basis at this time.
+This entry can only be specified on a per-host basis at this time.
 .Pp
-If an SADB entry cannot be found for the destination, the outgoing traffic
-will have an invalid digest option prepended, and the following error message
-will be visible on the system console:
-.Em "tcp_signature_compute: SADB lookup failed for %d.%d.%d.%d" .
+If an SADB entry cannot be found for the destination,
+the system does not send any outgoing segments and drops any inbound segments.
+.Pp
+Each dropped segment is taken into account in the TCP protocol statistics.
 .El
 .Pp
 The option level for the