linux-sg2042/net/ipv6
Wei Dong dafee49085 [IPV6]: SNMPv2 "ipv6IfStatsOutFragCreates" counter error
When I tested linux kernel 2.6.71.7 about statistics
"ipv6IfStatsOutFragCreates", and found that it couldn't increase
correctly. The criteria is RFC 2465:

  ipv6IfStatsOutFragCreates OBJECT-TYPE
      SYNTAX      Counter32
      MAX-ACCESS  read-only
      STATUS      current
      DESCRIPTION
         "The number of output datagram fragments that have
         been generated as a result of fragmentation at
         this output interface."
      ::= { ipv6IfStatsEntry 15 }

I think there are two issues in Linux kernel. 
1st:
RFC2465 specifies the counter is "The number of output datagram
fragments...". I think increasing this counter after output a fragment
successfully is better. And it should not be increased even though a
fragment is created but failed to output.

2nd:
If we send a big ICMP/ICMPv6 echo request to a host, and receive
ICMP/ICMPv6 echo reply consisted of some fragments. As we know that in
Linux kernel first fragmentation occurs in ICMP layer(maybe saying
transport layer is better), but this is not the "real"
fragmentation,just do some "pre-fragment" -- allocate space for date,
and form a frag_list, etc. The "real" fragmentation happens in IP layer
-- set offset and MF flag and so on. So I think in "fast path" for
ip_fragment/ip6_fragment, if we send a fragment which "pre-fragment" by
upper layer we should also increase "ipv6IfStatsOutFragCreates".

Signed-off-by: Wei Dong <weid@nanjing-fnst.com>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-08-02 13:41:21 -07:00
..
netfilter [NET]: add+use poison defines 2006-07-03 19:47:27 -07:00
Kconfig [IPSEC] xfrm: Abstract out encapsulation modes 2006-06-17 21:28:39 -07:00
Makefile [IPSEC] xfrm: Abstract out encapsulation modes 2006-06-17 21:28:39 -07:00
addrconf.c [IPV6] ADDRCONF: NLM_F_REPLACE support for RTM_NEWADDR 2006-08-02 13:38:12 -07:00
af_inet6.c [IPV6]: Audit all ip6_dst_lookup/ip6_dst_store calls 2006-08-02 13:38:14 -07:00
ah6.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
anycast.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
datagram.c [PATCH] capable/capability.h (net/) 2006-01-11 18:42:14 -08:00
esp6.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
exthdrs.c [IPV6]: Added GSO support for TCPv6 2006-06-30 14:12:06 -07:00
exthdrs_core.c [SELINUX]: Fix ipv6_skip_exthdr() invocation causing OOPS. 2005-04-24 20:16:19 -07:00
icmp.c [PATCH] for_each_possible_cpu: network codes 2006-04-11 06:18:31 -07:00
inet6_connection_sock.c [IPV6]: Audit all ip6_dst_lookup/ip6_dst_store calls 2006-08-02 13:38:14 -07:00
inet6_hashtables.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ip6_fib.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ip6_flowlabel.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ip6_input.c [IPV6]: Clean skb cb on IPv6 input. 2006-07-24 23:44:44 -07:00
ip6_output.c [IPV6]: SNMPv2 "ipv6IfStatsOutFragCreates" counter error 2006-08-02 13:41:21 -07:00
ip6_tunnel.c [NET]: Conversions from kmalloc+memset to k(z|c)alloc. 2006-07-21 14:51:30 -07:00
ipcomp6.c [IPCOMP]: Fix truesize after decompression 2006-07-12 13:58:55 -07:00
ipv6_sockglue.c [NET] gso: Fix up GSO packets with broken checksums 2006-07-08 13:34:56 -07:00
ipv6_syms.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
mcast.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ndisc.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
netfilter.c [NETFILTER]: Fix build with CONFIG_NETFILTER=y/m on IA64 2006-04-09 22:25:49 -07:00
proc.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
protocol.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
raw.c [IPV4/IPV6]: Setting 0 for unused port field in RAW IP recvmsg(). 2006-07-25 17:05:35 -07:00
reassembly.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
route.c [NET]: Core net changes to generate netevents 2006-08-02 13:38:21 -07:00
sit.c [IPV4]: Get rid of redundant IPCB->opts initialisation 2006-07-21 14:29:53 -07:00
sysctl_net_ipv6.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
tcp_ipv6.c [TCP]: SNMPv2 tcpAttemptFails counter error 2006-08-02 13:38:19 -07:00
tunnel6.c [INET]: Move no-tunnel ICMP error to tunnel4/tunnel6 2006-04-09 22:25:25 -07:00
udp.c [IPV6]: Audit all ip6_dst_lookup/ip6_dst_store calls 2006-08-02 13:38:14 -07:00
xfrm6_input.c [IPSEC] xfrm: Abstract out encapsulation modes 2006-06-17 21:28:39 -07:00
xfrm6_mode_transport.c [IPSEC] proto: Move transport mode input path into xfrm_mode_transport 2006-06-17 21:28:41 -07:00
xfrm6_mode_tunnel.c [IPSEC] xfrm: Abstract out encapsulation modes 2006-06-17 21:28:39 -07:00
xfrm6_output.c [XFRM]: Fix protocol field value for outgoing IPv6 GSO packets 2006-08-02 13:38:13 -07:00
xfrm6_policy.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
xfrm6_state.c [IPSEC] xfrm: Undo afinfo lock proliferation 2006-06-17 21:28:37 -07:00
xfrm6_tunnel.c [IPV6] xfrm6_tunnel: Delete debugging code. 2006-07-24 13:49:06 -07:00