linux.git/net/ipv6/proc.c, branch v2.6.24

[IPV6]: RFC 2011 compatibility broken

2008-01-21T11:05:43+00:00

The snmp6 entry name was changed, and it broke compatibility
to RFC 2011.

Signed-off-by: Wang Chen 
Acked-by: YOSHIFUJI Hideaki 
Signed-off-by: David S. Miller

[NET]: Define infrastructure to keep 'inuse' changes in an efficent SMP/NUMA way.

2007-11-07T12:08:57+00:00

"struct proto" currently uses an array stats[NR_CPUS] to track change on
'inuse' sockets per protocol.

If NR_CPUS is big, this means we use a big memory area for this.
Moreover, all this memory area is located on a single node on NUMA
machines, increasing memory pressure on the boot node.

In this patch, I tried to :

- Keep a fast !CONFIG_SMP implementation
- Keep a fast CONFIG_SMP implementation for often used protocols
(tcp,udp,raw,...)
- Introduce a NUMA efficient implementation

Some helper macros are defined in include/net/sock.h
These macros take into account CONFIG_SMP

If a "struct proto" is declared without using DEFINE_PROTO_INUSE /
REF_PROTO_INUSE
macros, it will automatically use a default implementation, using a
dynamically allocated percpu zone.
This default implementation will be NUMA efficient, but might use 32/64
bytes per possible cpu
because of current alloc_percpu() implementation.
However it still should be better than previous implementation based on
stats[NR_CPUS] field.

When a "struct proto" is changed to use the new macros, we use a single
static "int" percpu variable,
lowering the memory and cpu costs, still preserving NUMA efficiency.

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

[INET]: Collect frag queues management objects together

2007-10-15T19:26:39+00:00

There are some objects that are common in all the places
which are used to keep track of frag queues, they are:

 * hash table
 * LRU list
 * rw lock
 * rnd number for hash function
 * the number of queues
 * the amount of memory occupied by queues
 * secret timer

Move all this stuff into one structure (struct inet_frags)
to make it possible use them uniformly in the future. Like
with the previous patch this mostly consists of hunks like

-    write_lock(&ipfrag_lock);
+    write_lock(&ip4_frags.lock);

To address the issue with exporting the number of queues and
the amount of memory occupied by queues outside the .c file
they are declared in, I introduce a couple of helpers.

Signed-off-by: Pavel Emelyanov 
Signed-off-by: David S. Miller

[IPV6]: Add ICMPMsgStats MIB (RFC 4293) [rev 2]

2007-10-10T23:51:27+00:00

Background: RFC 4293 deprecates existing individual, named ICMP
type counters to be replaced with the ICMPMsgStatsTable. This table
includes entries for both IPv4 and IPv6, and requires counting of all
ICMP types, whether or not the machine implements the type.

These patches "remove" (but not really) the existing counters, and
replace them with the ICMPMsgStats tables for v4 and v6.
It includes the named counters in the /proc places they were, but gets the
values for them from the new tables. It also counts packets generated
from raw socket output (e.g., OutEchoes, MLD queries, RA's from
radvd, etc).

Changes:
1) create icmpmsg_statistics mib
2) create icmpv6msg_statistics mib
3) modify existing counters to use these
4) modify /proc/net/snmp to add "IcmpMsg" with all ICMP types
        listed by number for easy SNMP parsing
5) modify /proc/net/snmp printing for "Icmp" to get the named data
        from new counters.
[new to 2nd revision]
6) support per-interface ICMP stats
7) use common macro for per-device stat macros

Signed-off-by: David L Stevens 
Signed-off-by: David S. Miller

[NET]: Make /proc/net per network namespace

2007-10-10T23:49:06+00:00

This patch makes /proc/net per network namespace.  It modifies the global
variables proc_net and proc_net_stat to be per network namespace.
The proc_net file helpers are modified to take a network namespace argument,
and all of their callers are fixed to pass &init_net for that argument.
This ensures that all of the /proc/net files are only visible and
usable in the initial network namespace until the code behind them
has been updated to be handle multiple network namespaces.

Making /proc/net per namespace is necessary as at least some files
in /proc/net depend upon the set of network devices which is per
network namespace, and even more files in /proc/net have contents
that are relevant to a single network namespace.

Signed-off-by: Eric W. Biederman 
Signed-off-by: David S. Miller

[IPV6]: Track device renames in snmp6.

2007-04-29T04:16:39+00:00

When network device's are renamed, the IPV6 snmp6 code
gets confused. It doesn't track name changes so it will OOPS
when network device's are removed.

The fix is trivial, just unregister/re-register in notify handler.

Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller

[IPV6]: Consolidate common SNMP code

2007-04-26T05:29:52+00:00

This patch moves the non-proc SNMP code into addrconf.c and reuses
IPv4 SNMP code where applicable.

As a result we can skip proc.o if /proc is disabled.

Note that I've made a number of functions static since they're only
used by addrconf.c for now.  If they ever get used elsewhere we can
always remove the static.

Signed-off-by: Herbert Xu 
Acked-by: YOSHIFUJI Hideaki 
Signed-off-by: David S. Miller

[IPV6] SNMP: Use put_unaligned() instead of memcpy().

2007-04-26T05:29:37+00:00

Hint from David Miller .

Signed-off-by: YOSHIFUJI Hideaki 
Signed-off-by: David S. Miller

[IPV6] SNMP: Avoid unaligned accesses.

2007-04-26T05:29:35+00:00

Because stats pointer may not be aligned for u64, use memcpy
to fill u64 values.
Issue reported by David Miller .

Signed-off-by: YOSHIFUJI Hideaki

[IPV6] SNMP: Export statistics via netlink without CONFIG_PROC_FS.

2007-04-26T05:29:13+00:00

Signed-off-by: YOSHIFUJI Hideaki 
Signed-off-by: David S. Miller