Add support for the ranged tag (tag type #5) to the CIPSOv4 protocol.

The ranged tag allows for seven, or eight if zero is the lowest category,
category ranges to be specified in a CIPSO option.  Each range is specified by
two unsigned 16 bit fields, each with a maximum value of 65534.  The two values
specify the start and end of the category range; if the start of the category
range is zero then it is omitted.

See Documentation/netlabel/draft-ietf-cipso-ipsecurity-01.txt for more details.
Signed-off-by: NPaul Moore <paul.moore@hp.com>
Signed-off-by: NJames Morris <jmorris@namei.org>

Add support for the enumerated tag (tag type #2) to the CIPSOv4 protocol.

The enumerated tag allows for 15 categories to be specified in a CIPSO option,
where each category is an unsigned 16 bit field with a maximum value of 65534.

See Documentation/netlabel/draft-ietf-cipso-ipsecurity-01.txt for more details.
Signed-off-by: NPaul Moore <paul.moore@hp.com>
Signed-off-by: NJames Morris <jmorris@namei.org>

The original NetLabel category bitmap was a straight char bitmap which worked
fine for the initial release as it only supported 240 bits due to limitations
in the CIPSO restricted bitmap tag (tag type 0x01).  This patch converts that
straight char bitmap into an extensibile/sparse bitmap in order to lay the
foundation for other CIPSO tag types and protocols.

This patch also has a nice side effect in that all of the security attributes
passed by NetLabel into the LSM are now in a format which is in the host's
native byte/bit ordering which makes the LSM specific code much simpler; look
at the changes in security/selinux/ss/ebitmap.c as an example.
Signed-off-by: NPaul Moore <paul.moore@hp.com>
Signed-off-by: NJames Morris <jmorris@namei.org>

It is time to move on :-)
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Fix some unused function/variable warnings.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Signed-off-by: NPatrick McHardy <kaber@trash.net>

The attached patch adds --snat-arp support, which makes it possible to
change the source mac address in both the mac header and the arp header
with one rule.
Signed-off-by: NBart De Schuymer <bdschuym@pandora.be>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Add new NFLOG target to allow use of nfnetlink_log for both IPv4 and IPv6.
Currently we have two (unsupported by userspace) hacks in the LOG and ULOG
targets to optionally call to the nflog API. They lack a few features,
namely the IPv4 and IPv6 LOG targets can not specify a number of arguments
related to nfnetlink_log, while the ULOG target is only available for IPv4.
Remove those hacks and add a clean way to use nfnetlink_log.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Signed-off-by: NPatrick McHardy <kaber@trash.net>

There is no reason for limiting netlink attributes in size.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Signed-off-by: NEric Leblond <eric@inl.fr>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

               |   NEW   | UPDATE  | DESTROY |
     ----------------------------------------|
     tuples    |    Y    |    Y    |    Y    |
     status    |    Y    |    Y    |    N    |
     timeout   |    Y    |    Y    |    N    |
     protoinfo |    S    |    S    |    N    |
     helper    |    S    |    S    |    N    |
     mark      |    S    |    S    |    N    |
     counters  |    F    |    F    |    Y    |

 Leyend:
         Y: yes
         N: no
         S: iif the field is set
	 F: iif overflow

This patch also replace IPCT_HELPINFO by IPCT_HELPER since we want to
track the helper assignation process, not the changes in the private
information held by the helper.
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Check that status flags are available in the netlink message received
to create a new conntrack.
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The NAT handling of the SIP helper has a few problems:

- Request headers are only mangled in the reply direction, From/To headers
  not at all, which can lead to authentication failures with DNAT in case
  the authentication domain is the IP address

- Contact headers in responses are only mangled for REGISTER responses

- Headers may be mangled even though they contain addresses not
  participating in the connection, like alternative addresses

- Packets are droppen when domain names are used where the helper expects
  IP addresses

This patch takes a different approach, instead of fixed rules what field
to mangle to what content, it adds symetric mapping of From/To/Via/Contact
headers, which allows to deal properly with echoed addresses in responses
and foreign addresses not belonging to the connection.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Not every header has a shortcut, so make them optional instead
of searching for the same string twice.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

SIP headers are generally case-insensitive, only SDP headers are
case sensitive.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

- Use enum for header field enumeration
- Use numerical value instead of pointer to header info structure to
  identify headers, unexport ct_sip_hdrs
- group SIP and SDP entries in header info structure
- remove double forward declaration of ct_sip_get_info
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The NAT helpr hooks are protected by RCU, but all of the
conntrack helpers test and use the global pointers instead
of copying them first using rcu_dereference()

Also replace synchronize_net() by synchronize_rcu() for clarity
since sychronizing only with packet receive processing is
insufficient to prevent races.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

We usually uses 'xxx_find_get' for function which increments
reference count.
Signed-off-by: NYasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

This patch adds /proc/net/ip_conntrack, /proc/net/ip_conntrack_expect and
/proc/net/stat/ip_conntrack files to keep old programs using them working.

The /proc/net/ip_conntrack and /proc/net/ip_conntrack_expect files show only
IPv4 entries, the /proc/net/stat/ip_conntrack shows global statistics.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

This patch adds an option to keep the connection tracking sysctls visible
under their old names.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Signed-off-by: NPatrick McHardy <kaber@trash.net>

Add helper functions for sysctl registration with optional instantiating
of common path elements (like net/netfilter) and use it for support for
automatic registation of conntrack protocol sysctls.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Using extern in a C file is a bad idea because the compiler can't
catch type errors.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Signed-off-by: NPatrick McHardy <kaber@trash.net>

Only update the conntrack timer if there's been at least HZ jiffies since
the last update. Reduces the number of del_timer/add_timer cycles from one
per packet to one per connection per second (plus once for each state change
of a connection)

Should handle timer wraparounds and connection timeout changes.
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Remove unused struct list_head from struct nf_conntrack_l3proto and
nf_conntrack_l4proto as all protocols are kept in arrays, not linked
lists.
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Minor whitespace cleanup.
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Remove the usage of ASSERT_READ_LOCK/ASSERT_WRITE_LOCK in nf_conntrack,
it didn't do anything, it was just an empty define and it uglified the code.
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Add some more sanity checks when registering/unregistering l3/l4 protocols.
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Rename 'struct nf_conntrack_protocol' to 'struct nf_conntrack_l4proto' in
order to help distinguish it from 'struct nf_conntrack_l3proto'. It gets
rather confusing with 'nf_conntrack_protocol'.
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Place rarely written variables in the read-mostly section by using
__read_mostly
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

This patch splits out L3/L4 protocol handling into its own file
nf_conntrack_proto.c
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

This patch splits out the event cache into its own file
nf_conntrack_ecache.c
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

This patch splits out handling of helpers into its own file
nf_conntrack_helper.c
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

This patch splits out expectation handling into its own file
nf_conntrack_expect.c
Signed-off-by: NMartin Josefsson <gandalf@wlug.westbo.se>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

This helps Vegas cope better with delayed ACKs, see
analysis at:

http://www.cs.caltech.edu/%7Eweixl/technical/ns2linux/known_linux/index.html#vegasSigned-off-by: NDavid S. Miller <davem@davemloft.net>

This patch implements a suggestion by Ian McDonald and

 1) Avoids tests against negative packet lengths by using unsigned int
    for packet payload lengths in the CCID send_packet()/packet_sent() routines

 2) As a consequence, it removes an now unnecessary test with regard to `len > 0'
    in ccid3_hc_tx_packet_sent: that condition is always true, since
      * negative packet lengths are avoided
      * ccid3_hc_tx_send_packet flags an error whenever the payload length is 0.
        As a consequence, ccid3_hc_tx_packet_sent is never called as all errors
        returned by ccid_hc_tx_send_packet are caught in dccp_write_xmit

 3) Removes the third argument of ccid_hc_tx_send_packet (the `len' parameter),
    since it is currently always set to skb->len. The code is updated with regard
    to this parameter change.
Signed-off-by: NGerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: NIan McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: NArnaldo Carvalho de Melo <acme@mandriva.com>

This implements the larger-initial-windows feature for CCID 3, as described in
section 5 of RFC 4342. When the first feedback packet arrives, the sender can
send up to 2..4 packets per RTT, instead of just one.

The patch further
 * reduces the number of timestamping calls by passing the timestamp value
   (which is computed in one of the calling functions anyway) as argument

 * renames one constant with a very long name into one which is shorter and
   resembles the one in RFC 3448 (t_mbi)

 * simplifies some of the min_t/max_t cases where both `x', `y' have the same
   type

Commiter note: renamed TFRC_t_mbi to TFRC_T_MBI, to follow Linux coding style.
Signed-off-by: NGerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: NIan McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: NArnaldo Carvalho de Melo <acme@mandriva.com>

To reflect the fact that this now is of no effect, not making apps
stop working, just be warned in the system log.
Signed-off-by: NArnaldo Carvalho de Melo <acme@mandriva.com>