When a message carries multiple commands and one of them triggers
an error, we have to report to the userspace which one was that.
The line number of the command plays this role and there's an attribute
reserved in the header part of the message to be filled out with the error
line number. In order not to modify the original message received from
the userspace, we construct a new, complete netlink error message and
modifies the attribute there, then send it.
Netlink is notified not to send its ACK/error message.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Add a dummy ip_set_get_ip6_port function that unconditionally
returns false for CONFIG_IPV6=n and convert the real function
to ipv6_skip_exthdr() to avoid pulling in the ip6_tables module
when loading ipset.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Don't fall through in the switch statement, otherwise IPv4 headers
are incorrectly parsed again as IPv6 and the return value will always
be 'false'.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

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

ip_vs_sync_cleanup() may be called from ip_vs_init() on error
and thus needs to be accesible from section __init
Reporte-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>
Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NHans Schillstrom <hans@schillstrom.com>
Tested-by: NHans Schillstrom <hans@schillstrom.com>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

This is a rather naieve approach to allowing PVS to compile with
CONFIG_SYSCTL disabled.  I am working on a more comprehensive patch which
will remove compilation of all sysctl-related IPVS code when CONFIG_SYSCTL
is disabled.
Reported-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>
Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NHans Schillstrom <hans@schillstrom.com>
Tested-by: NHans Schillstrom <hans@schillstrom.com>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

These variables are unused as a result of the recent netns work.
Signed-off-by: NSimon Horman <horms@verge.net.au>
Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NHans Schillstrom <hans@schillstrom.com>
Tested-by: NHans Schillstrom <hans@schillstrom.com>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Signed-off-by: NSimon Horman <horms@verge.net.au>
Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NHans Schillstrom <hans@schillstrom.com>
Tested-by: NHans Schillstrom <hans@schillstrom.com>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Reported-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>
Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NHans Schillstrom <hans@schillstrom.com>
Tested-by: NHans Schillstrom <hans@schillstrom.com>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

net/netfilter/nf_conntrack_netlink.c: In function 'ctnetlink_parse_tuple':
net/netfilter/nf_conntrack_netlink.c:832:11: warning: comparison between 'enum ctattr_tuple' and 'enum ctattr_type'

Use ctattr_type for the 'type' parameter since that's the type of all attributes
passed to this function.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

None of the set types need uaccess.h since this is handled centrally
in ip_set_core. Most set types additionally don't need bitops.h and
spinlock.h since they use neither. tcp.h is only needed by those
using before(), udp.h is not needed at all.
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Replace calls of the form:

nla_parse(tb, ATTR_MAX, nla_data(attr), nla_len(attr), policy)

by:

nla_parse_nested(tb, ATTR_MAX, attr, policy)
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The patch adds the combined module of the "SET" target and "set" match
to netfilter. Both the previous and the current revisions are supported.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the list:set type support in two flavours:
without and with timeout. The sets has two sides: for the userspace,
they store the names of other (non list:set type of) sets: one can add,
delete and test set names. For the kernel, it forms an ordered union of
the member sets: the members sets are tried in order when elements are
added, deleted and tested and the process stops at the first success.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the hash:net,port type support in four flavours:
for IPv4 and IPv6, both without and with timeout support. The elements
are two dimensional: IPv4/IPv6 network address/prefix and protocol/port
pairs.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the hash:net type support in four flavours:
for IPv4 and IPv6, both without and with timeout support. The elements
are one dimensional: IPv4/IPv6 network address/prefixes.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the hash:ip,port,net type support in four flavours:
for IPv4 and IPv6, both without and with timeout support. The elements
are three dimensional: IPv4/IPv6 address, protocol/port and IPv4/IPv6
network address/prefix triples. The different prefixes are searched/matched
from the longest prefix to the shortes one (most specific to least).
In other words the processing time linearly grows with the number of
different prefixes in the set.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the hash:ip,port,ip type support in four flavours:
for IPv4 and IPv6, both without and with timeout support. The elements
are three dimensional: IPv4/IPv6 address, protocol/port and IPv4/IPv6
address triples.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the hash:ip,port type support in four flavours:
for IPv4 and IPv6, both without and with timeout support. The elements
are two dimensional: IPv4/IPv6 address and protocol/port pairs. The port
is interpeted for TCP, UPD, ICMP and ICMPv6 (at the latters as type/code
of course).
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the hash:ip type support in four flavours:
for IPv4 or IPv6, both without and with timeout support.

All the hash types are based on the "array hash" or ahash structure
and functions as a good compromise between minimal memory footprint
and speed. The hashing uses arrays to resolve clashes. The hash table
is resized (doubled) when searching becomes too long. Resizing can be
triggered by userspace add commands only and those are serialized by
the nfnl mutex. During resizing the set is read-locked, so the only
possible concurrent operations are the kernel side readers. Those are
protected by RCU locking.

Because of the four flavours and the other hash types, the functions
are implemented in general forms in the ip_set_ahash.h header file
and the real functions are generated before compiling by macro expansion.
Thus the dereferencing of low-level functions and void pointer arguments
could be avoided: the low-level functions are inlined, the function
arguments are pointers of type-specific structures.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the bitmap:port type in two flavours, without
and with timeout support to store TCP/UDP ports from a range.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the bitmap:ip,mac set type in two flavours,
without and with timeout support. In this kind of set one can store
IPv4 address and (source) MAC address pairs. The type supports elements
added without the MAC part filled out: when the first matching from kernel
happens, the MAC part is automatically filled out. The timing out of the
elements stars when an element is complete in the IP,MAC pair.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The module implements the bitmap:ip set type in two flavours, without
and with timeout support. In this kind of set one can store IPv4
addresses (or network addresses) from a given range.

In order not to waste memory, the timeout version does not rely on
the kernel timer for every element to be timed out but on garbage
collection. All set types use this mechanism.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The patch adds the IP set core support to the kernel.

The IP set core implements a netlink (nfnetlink) based protocol by which
one can create, destroy, flush, rename, swap, list, save, restore sets,
and add, delete, test elements from userspace. For simplicity (and backward
compatibilty and for not to force ip(6)tables to be linked with a netlink
library) reasons a small getsockopt-based protocol is also kept in order
to communicate with the ip(6)tables match and target.

The netlink protocol passes all u16, etc values in network order with
NLA_F_NET_BYTEORDER flag. The protocol enforces the proper use of the
NLA_F_NESTED and NLA_F_NET_BYTEORDER flags.

For other kernel subsystems (netfilter match and target) the API contains
the functions to add, delete and test elements in sets and the required calls
to get/put refereces to the sets before those operations can be performed.

The set types (which are implemented in independent modules) are stored
in a simple RCU protected list. A set type may have variants: for example
without timeout or with timeout support, for IPv4 or for IPv6. The sets
(i.e. the pointers to the sets) are stored in an array. The sets are
identified by their index in the array, which makes possible easy and
fast swapping of sets. The array is protected indirectly by the nfnl
mutex from nfnetlink. The content of the sets are protected by the rwlock
of the set.

There are functional differences between the add/del/test functions
for the kernel and userspace:

- kernel add/del/test: works on the current packet (i.e. one element)
- kernel test: may trigger an "add" operation  in order to fill
  out unspecified parts of the element from the packet (like MAC address)
- userspace add/del: works on the netlink message and thus possibly
  on multiple elements from the IPSET_ATTR_ADT container attribute.
- userspace add: may trigger resizing of a set
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

The patch adds the NFNL_SUBSYS_IPSET id and NLA_PUT_NET* macros to the
vanilla kernel.
Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Signed-off-by: NThomas Jacob <jacob@internet24.de>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Signed-off-by: NThomas Jacob <jacob@internet24.de>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

xt_connlimit normally records the "original" tuples in a hashlist
(such as "1.2.3.4 -> 5.6.7.8"), and looks in this list for iph->daddr
when counting.

When the user however uses DNAT in PREROUTING, looking for
iph->daddr -- which is now 192.168.9.10 -- will not match. Thus in
daddr mode, we need to record the reverse direction tuple
("192.168.9.10 -> 1.2.3.4") instead. In the reverse tuple, the dst
addr is on the src side, which is convenient, as count_them still uses
&conn->tuple.src.u3.
Signed-off-by: NJan Engelhardt <jengelh@medozas.de>

Fix compiler warnings when IP_VS_DBG() isn't defined.
Signed-off-by: NChangli Gao <xiaosuo@gmail.com>
Acked-by: NHans Schillstrom <hans.schillstrom@ericsson.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>

The newly created table was not used when register sysctl for a new namespace.
I.e. sysctl doesn't work for other than root namespace (init_net)
Signed-off-by: NHans Schillstrom <hans.schillstrom@ericsson.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>

The recent netns changes omitted to change
sock_create_kernel() to __sock_create() in ip_vs_sync.c

The effect of this is that the interface will be selected in the
root-namespace, from my point of view it's a major bug.
Reported-by: NHans Schillstrom <hans@schillstrom.com>
Acked-by: NJulian Anastasov <ja@ssi.bg>
Signed-off-by: NSimon Horman <horms@verge.net.au>

Fix compiler warnings when no transport protocol load balancing support
is configured.

[horms@verge.net.au: removed suprious __ip_vs_cleanup() clean-up hunk]
Signed-off-by: NChangli Gao <xiaosuo@gmail.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>

After commit ae90bdea (netfilter: fix compilation when conntrack is
disabled but tproxy is enabled) we have following warnings :

net/ipv6/netfilter/nf_conntrack_reasm.c:520:16: warning: symbol
'nf_ct_frag6_gather' was not declared. Should it be static?
net/ipv6/netfilter/nf_conntrack_reasm.c:591:6: warning: symbol
'nf_ct_frag6_output' was not declared. Should it be static?
net/ipv6/netfilter/nf_conntrack_reasm.c:612:5: warning: symbol
'nf_ct_frag6_init' was not declared. Should it be static?
net/ipv6/netfilter/nf_conntrack_reasm.c:640:6: warning: symbol
'nf_ct_frag6_cleanup' was not declared. Should it be static?

Fix this including net/netfilter/ipv6/nf_defrag_ipv6.h
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
CC: KOVACS Krisztian <hidden@balabit.hu>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

net/built-in.o: In function `nf_conntrack_init_net':
net/netfilter/nf_conntrack_core.c:1521:
	undefined reference to `nf_conntrack_tstamp_init'
net/netfilter/nf_conntrack_core.c:1531:
	undefined reference to `nf_conntrack_tstamp_fini'

Add dummy inline functions for the =n case to fix this.
Reported-by: NJohn Fastabend <john.r.fastabend@intel.com>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Resolve these warnings on `make headers_check`:

usr/include/linux/netfilter/xt_CT.h:7: found __[us]{8,16,32,64} type
without #include <linux/types.h>
...
Signed-off-by: NJan Engelhardt <jengelh@medozas.de>

If SNAT isn't done, the wrong info maybe got by the other cts.

As the filter table is after DNAT table, the packets dropped in filter
table also bother bysource hash table.
Signed-off-by: NChangli Gao <xiaosuo@gmail.com>
Signed-off-by: NPatrick McHardy <kaber@trash.net>

Accidentally missed removing the old out-of-union "inverse" member,
which caused the struct size to change which then gives size mismatch
warnings when using an old iptables.

It is interesting to see that gcc did not warn about this before.
(Filed http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47376 )
Signed-off-by: NJan Engelhardt <jengelh@medozas.de>

Conflicts:
	Documentation/feature-removal-schedule.txt
Signed-off-by: NPatrick McHardy <kaber@trash.net>