Introduce support to lazy initialize mostly static keys v2

Hi!

This series implements support for delaying the initialization of secret
keys, e.g. used for hashing, for as long as possible. This functionality
is implemented by a new macro, net_get_random_bytes.

I already used it to protect the socket hashes, the syncookie secret
(most important) and the tcp_fastopen secrets.   

Changelog:
v2) Use static_keys in net_get_random_once to have as minimal impact to
    the fast-path as possible.

Included patches:
 ipv4: split inet_ehashfn to hash functions
 ipv6: split inet6_ehashfn to hash functions
 x86/jump_label: expect default_nop if
 net: introduce new macro net_get_random_once
 inet: split syncookie keys for ipv4 and ipv6
 inet: convert inet_ehash_secret and
 tcp: switch tcp_fastopen key generation to
 net: switch net_secret key generation to

Diffstat:
 arch/x86/kernel/jump_label.c   | 25 ++++++++++++++++++-------
 include/linux/net.h            | 25 +++++++++++++++++++++++++
 include/net/inet6_hashtables.h | 29 +++++++----------------------
 include/net/inet_sock.h        | 26 ++++++--------------------
 include/net/ipv6.h             |  4 ++--
 include/net/tcp.h              |  3 +--
 net/core/secure_seq.c          | 14 ++------------
 net/core/utils.c               | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 net/ipv4/af_inet.c             | 27 ---------------------------
 net/ipv4/inet_hashtables.c     | 25 +++++++++++++++++++++++++
 net/ipv4/syncookies.c          | 15 +++++----------
 net/ipv4/sysctl_net_ipv4.c     |  5 +++++
 net/ipv4/tcp_fastopen.c        | 27 ++++++++++++++++-----------
 net/ipv4/udp.c                 | 20 ++++++++++++++++----
 net/ipv6/af_inet6.c            |  5 -----
 net/ipv6/inet6_hashtables.c    | 34 ++++++++++++++++++++++++++++++++++
 net/ipv6/syncookies.c          | 12 +++++++++---
 net/ipv6/udp.c                 | 31 +++++++++++++++++++++++++++----
 net/rds/connection.c           | 12 +++++++++---
 19 files changed, 255 insertions(+), 132 deletions(-)

Greetings,

  Hannes
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/