Add missing CVS tags.

ok patrick@

kernel: use gettime(9)/getuptime(9) in lieu of time_second(9)/time_uptime(9)

time_second(9) and time_uptime(9) are widely used in the kernel to
quickly get the system UTC or system uptime as a time_t. However,
time_t is 64-bit everywhere, so it is not generally safe to use them
on 32-bit platforms: you have a split-read problem if your hardware
cannot perform atomic 64-bit reads.

This patch replaces time_second(9) with gettime(9), a safer successor
interface, throughout the kernel. Similarly, time_uptime(9) is replaced
with getuptime(9).

There is a performance cost on 32-bit platforms in exchange for
eliminating the split-read problem: instead of two register reads you
now have a lockless read loop to pull the values from the timehands.
This is really not *too* bad in the grand scheme of things, but
compared to what we were doing before it is several times slower.

There is no performance cost on 64-bit (__LP64__) platforms.

With input from visa@, dlg@, and tedu@.

Several bugs squashed by visa@.

ok kettenis@

idgen32(9): use time_uptime(9) for rekey timestamps, not time_second(9)

Timestamp contexts with a monotonic clock. time_second(9) can jump,
stretching or truncating our rekey interval. time_uptime(9) will not
jump around.

ok djm@

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

fix a bug that caused time-based rekeys to happen too frequently.

rename the structure internals to id32_* in anticipation of an
idgen16() that might come in the future.

sizeof(ptr) -> sizeof(*ptr) as intended; ok djm@ millert@

implement automatic time-based rekeying (every 10 minutes); ok deraadt@

Introduce a facility to generate unpredictable 32 bit numbers with
near maximal (2^32) cycle times. These are useful for network
IDs in cases where there are negative consequences to ID prediction
and/or reuse.

Use the idgen32() functions to generate IPv6 IDs and NFS client/server
XIDs.

Pseudorandom permutation code in crypto/idgen.c based on public
domain skip32.c from Greg Rose.

feedback & ok thib@ deraadt@

kernel: use gettime(9)/getuptime(9) in lieu of time_second(9)/time_uptime(9)

time_second(9) and time_uptime(9) are widely used in the kernel to
quickly get the system UTC or system uptime as a time_t. However,
time_t is 64-bit everywhere, so it is not generally safe to use them
on 32-bit platforms: you have a split-read problem if your hardware
cannot perform atomic 64-bit reads.

This patch replaces time_second(9) with gettime(9), a safer successor
interface, throughout the kernel. Similarly, time_uptime(9) is replaced
with getuptime(9).

There is a performance cost on 32-bit platforms in exchange for
eliminating the split-read problem: instead of two register reads you
now have a lockless read loop to pull the values from the timehands.
This is really not *too* bad in the grand scheme of things, but
compared to what we were doing before it is several times slower.

There is no performance cost on 64-bit (__LP64__) platforms.

With input from visa@, dlg@, and tedu@.

Several bugs squashed by visa@.

ok kettenis@

idgen32(9): use time_uptime(9) for rekey timestamps, not time_second(9)

Timestamp contexts with a monotonic clock. time_second(9) can jump,
stretching or truncating our rekey interval. time_uptime(9) will not
jump around.

ok djm@

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

fix a bug that caused time-based rekeys to happen too frequently.

rename the structure internals to id32_* in anticipation of an
idgen16() that might come in the future.

sizeof(ptr) -> sizeof(*ptr) as intended; ok djm@ millert@

implement automatic time-based rekeying (every 10 minutes); ok deraadt@

Introduce a facility to generate unpredictable 32 bit numbers with
near maximal (2^32) cycle times. These are useful for network
IDs in cases where there are negative consequences to ID prediction
and/or reuse.

Use the idgen32() functions to generate IPv6 IDs and NFS client/server
XIDs.

Pseudorandom permutation code in crypto/idgen.c based on public
domain skip32.c from Greg Rose.

feedback & ok thib@ deraadt@

idgen32(9): use time_uptime(9) for rekey timestamps, not time_second(9)

Timestamp contexts with a monotonic clock. time_second(9) can jump,
stretching or truncating our rekey interval. time_uptime(9) will not
jump around.

ok djm@

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

fix a bug that caused time-based rekeys to happen too frequently.

rename the structure internals to id32_* in anticipation of an
idgen16() that might come in the future.

sizeof(ptr) -> sizeof(*ptr) as intended; ok djm@ millert@

implement automatic time-based rekeying (every 10 minutes); ok deraadt@

Introduce a facility to generate unpredictable 32 bit numbers with
near maximal (2^32) cycle times. These are useful for network
IDs in cases where there are negative consequences to ID prediction
and/or reuse.

Use the idgen32() functions to generate IPv6 IDs and NFS client/server
XIDs.

Pseudorandom permutation code in crypto/idgen.c based on public
domain skip32.c from Greg Rose.

feedback & ok thib@ deraadt@

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

fix a bug that caused time-based rekeys to happen too frequently.

rename the structure internals to id32_* in anticipation of an
idgen16() that might come in the future.

sizeof(ptr) -> sizeof(*ptr) as intended; ok djm@ millert@

implement automatic time-based rekeying (every 10 minutes); ok deraadt@

Introduce a facility to generate unpredictable 32 bit numbers with
near maximal (2^32) cycle times. These are useful for network
IDs in cases where there are negative consequences to ID prediction
and/or reuse.

Use the idgen32() functions to generate IPv6 IDs and NFS client/server
XIDs.

Pseudorandom permutation code in crypto/idgen.c based on public
domain skip32.c from Greg Rose.

feedback & ok thib@ deraadt@