Commit Graph

3036 Commits

Author SHA1 Message Date
Amerigo Wang
aa0010f880 net: convert __IPTUNNEL_XMIT() to an inline function
__IPTUNNEL_XMIT() is an ugly macro, convert it to a static
inline function, so make it more readable.

IPTUNNEL_XMIT() is unused, just remove it.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-14 18:49:50 -05:00
Hannes Frederic Sowa
5cb04436ee ipv6: add knob to send unsolicited ND on link-layer address change
This patch introduces a new knob ndisc_notify. If enabled, the kernel
will transmit an unsolicited neighbour advertisement on link-layer address
change to update the neighbour tables of the corresponding hosts more quickly.

This is the equivalent to arp_notify in ipv4 world.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-13 14:27:45 -05:00
YOSHIFUJI Hideaki / 吉藤英明
9fafd65ad4 ipv6 ndisc: Use pre-defined in6addr_linklocal_allnodes.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-12 15:23:21 -05:00
David S. Miller
d4185bbf62 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
	drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c

Minor conflict between the BCM_CNIC define removal in net-next
and a bug fix added to net.  Based upon a conflict resolution
patch posted by Stephen Rothwell.

Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-10 18:32:51 -05:00
Nicolas Dichtel
c075b13098 ip6tnl: advertise tunnel param via rtnl
It is usefull for daemons that monitor link event to have the full parameters of
these interfaces when a rtnl message is sent.
It allows also to dump them via rtnetlink.

It is based on what is done for GRE tunnels.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-09 19:36:20 -05:00
Nicolas Dichtel
ba3e3f50a0 sit: advertise tunnel param via rtnl
It is usefull for daemons that monitor link event to have the full parameters of
these interfaces when a rtnl message is sent.
It allows also to dump them via rtnetlink.

It is based on what is done for GRE tunnels.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-09 19:36:20 -05:00
Nicolas Dichtel
a375413311 gre6: fix rtnl dump messages
Spotted after a code review.
Introduced by c12b395a46 (gre: Support GRE over
IPv6).

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-09 17:11:17 -05:00
Hannes Frederic Sowa
60713a0ca7 ipv6: send unsolicited neighbour advertisements to all-nodes
As documented in RFC4861 (Neighbor Discovery for IP version 6) 7.2.6.,
unsolicited neighbour advertisements should be sent to the all-nodes
multicast address.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-09 16:18:52 -05:00
Li RongQing
a4477c4ddb ipv6: remove rt6i_peer_genid from rt6_info and its handler
6431cbc25f(Create a mechanism for upward inetpeer propagation into routes)
introduces these codes, but this mechanism is never enabled since
rt6i_peer_genid always is zero whether it is not assigned or assigned by
rt6_peer_genid(). After 5943634fc5 (ipv4: Maintain redirect and PMTU info
in struct rtable again), the ipv4 related codes of this mechanism has been
removed, I think we maybe able to remove them now.

Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-08 21:16:08 -05:00
Nicolas Dichtel
b20b6d9726 ndisc: fix a typo in a comment in ndisc_recv_na()
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-07 19:03:16 -05:00
Amerigo Wang
94e187c015 ipv6: introduce ip6_rt_put()
As suggested by Eric, we could introduce a helper function
for ipv6 too, to avoid checking if rt is NULL before
dst_release().

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-03 14:59:05 -04:00
Amerigo Wang
1a9408355e ipv6: remove a useless NULL check
In dev_forward_change(), it is useless to check if idev->dev
is NULL, it is always non-NULL here.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-03 14:50:15 -04:00
Eric Dumazet
e6c022a4fa tcp: better retrans tracking for defer-accept
For passive TCP connections using TCP_DEFER_ACCEPT facility,
we incorrectly increment req->retrans each time timeout triggers
while no SYNACK is sent.

SYNACK are not sent for TCP_DEFER_ACCEPT that were established (for
which we received the ACK from client). Only the last SYNACK is sent
so that we can receive again an ACK from client, to move the req into
accept queue. We plan to change this later to avoid the useless
retransmit (and potential problem as this SYNACK could be lost)

TCP_INFO later gives wrong information to user, claiming imaginary
retransmits.

Decouple req->retrans field into two independent fields :

num_retrans : number of retransmit
num_timeout : number of timeouts

num_timeout is the counter that is incremented at each timeout,
regardless of actual SYNACK being sent or not, and used to
compute the exponential timeout.

Introduce inet_rtx_syn_ack() helper to increment num_retrans
only if ->rtx_syn_ack() succeeded.

Use inet_rtx_syn_ack() from tcp_check_req() to increment num_retrans
when we re-send a SYNACK in answer to a (retransmitted) SYN.
Prior to this patch, we were not counting these retransmits.

Change tcp_v[46]_rtx_synack() to increment TCP_MIB_RETRANSSEGS
only if a synack packet was successfully queued.

Reported-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Julian Anastasov <ja@ssi.bg>
Cc: Vijay Subramanian <subramanian.vijay@gmail.com>
Cc: Elliott Hughes <enh@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-03 14:45:00 -04:00
Nicolas Dichtel
1a72418bd7 ipv6/multipath: remove flag NLM_F_EXCL after the first nexthop
fib6_add_rt2node() will reject the nexthop if this flag is set, so
we perform the check only for the first nexthop.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-02 21:38:19 -04:00
Amerigo Wang
07a936260a ipv6: use IS_ENABLED()
#if defined(CONFIG_FOO) || defined(CONFIG_FOO_MODULE)

can be replaced by

#if IS_ENABLED(CONFIG_FOO)

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-01 12:41:35 -04:00
David S. Miller
f8450bbe8c Merge branch 'master' of git://1984.lsi.us.es/nf
Pablo Neira Ayuso says:

====================
The following patchset contains fixes for your net tree, two of them
are due to relatively recent changes, one has been a longstanding bug,
they are:

* Fix incorrect usage of rt_gateway in the H.323 helper, from
  Julian Anastasov.

* Skip re-route in nf_nat code for ICMP traffic. If CONFIG_XFRM is
  enabled, we waste cycles to look up for the route again. This problem
  seems to be there since really long time. From Ulrich Weber.

* Fix mismatching section in nf_conntrack_reasm, from Hein Tibosch.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-31 14:54:15 -04:00
Nicolas Dichtel
76f8f6cb76 rtnl/ipv6: add support of RTM_GETNETCONF
This message allows to get the devconf for an interface.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-28 19:05:00 -04:00
Nicolas Dichtel
f3a1bfb11c rtnl/ipv6: use netconf msg to advertise forwarding status
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-28 19:05:00 -04:00
Hein Tibosch
f1df1374dc netfilter: nf_defrag_ipv6: solve section mismatch in nf_conntrack_reasm
WARNING: net/ipv6/netfilter/nf_defrag_ipv6.o(.text+0xe0): Section mismatch in
reference from the function nf_ct_net_init() to the function
.init.text:nf_ct_frag6_sysctl_register()
The function nf_ct_net_init() references the function
__init nf_ct_frag6_sysctl_register().

In case nf_conntrack_ipv6 is compiled as a module, nf_ct_net_init could be
called after the init code and data are unloaded. Therefore remove the
"__net_init" annotation from nf_ct_frag6_sysctl_register().

Signed-off-by: Hein Tibosch <hein_tibosch@yahoo.es>
Acked-by: Cong Wang <amwang@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-10-28 22:44:15 +01:00
Ulrich Weber
38fe36a248 netfilter: nf_nat: don't check for port change on ICMP tuples
ICMP tuples have id in src and type/code in dst.
So comparing src.u.all with dst.u.all will always fail here
and ip_xfrm_me_harder() is called for every ICMP packet,
even if there was no NAT.

Signed-off-by: Ulrich Weber <ulrich.weber@sophos.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-10-28 22:43:34 +01:00
Li RongQing
14edd87dc6 ipv6: Set default hoplimit as zero.
Commit a02e4b7dae4551(Demark default hoplimit as zero) only changes the
hoplimit checking condition and default value in ip6_dst_hoplimit, not
zeros all hoplimit default value.

Keep the zeroing ip6_template_metrics[RTAX_HOPLIMIT - 1] to force it as
const, cause as a37e6e344910(net: force dst_default_metrics to const
section)

Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-24 23:14:17 -04:00
Nicolas Dichtel
b3ce5ae1fb ipv6: fix sparse warnings in rt6_info_hash_nhsfn()
Adding by commit 51ebd31815 which adds the support of ECMP for IPv6.

Spotted-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-23 13:03:45 -04:00
Neal Cardwell
f3f121359c ipv6: tcp: clean up tcp_v6_early_demux() icsk variable
Remove an icsk variable, which by convention should refer to an
inet_connection_sock rather than an inet_sock. In the process, make
the tcp_v6_early_demux() code and formatting a bit more like
tcp_v4_early_demux(), to ease comparisons and maintenance.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-23 13:03:44 -04:00
Nicolas Dichtel
51ebd31815 ipv6: add support of equal cost multipath (ECMP)
Each nexthop is added like a single route in the routing table. All routes
that have the same metric/weight and destination but not the same gateway
are considering as ECMP routes. They are linked together, through a list called
rt6i_siblings.

ECMP routes can be added in one shot, with RTA_MULTIPATH attribute or one after
the other (in both case, the flag NLM_F_EXCL should not be set).

The patch is based on a previous work from
Luc Saillard <luc.saillard@6wind.com>.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-23 02:38:32 -04:00
Eric Dumazet
9f0d3c2781 ipv6: addrconf: fix /proc/net/if_inet6
Commit 1d5783030a (ipv6/addrconf: speedup /proc/net/if_inet6 filling)
added bugs hiding some devices from if_inet6 and breaking applications.

"ip -6 addr" could still display all IPv6 addresses, while "ifconfig -a"
couldnt.

One way to reproduce the bug is by starting in a shell :

unshare -n /bin/bash
ifconfig lo up

And in original net namespace, lo device disappeared from if_inet6

Reported-by: Jan Hinnerk Stosch <janhinnerk.stosch@gmail.com>
Tested-by: Jan Hinnerk Stosch <janhinnerk.stosch@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Mihai Maruseac <mihai.maruseac@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-16 14:41:47 -04:00
Alexey Kuznetsov
4c67525849 tcp: resets are misrouted
After commit e2446eaa ("tcp_v4_send_reset: binding oif to iif in no
sock case").. tcp resets are always lost, when routing is asymmetric.
Yes, backing out that patch will result in misrouting of resets for
dead connections which used interface binding when were alive, but we
actually cannot do anything here.  What's died that's died and correct
handling normal unbound connections is obviously a priority.

Comment to comment:
> This has few benefits:
>   1. tcp_v6_send_reset already did that.

It was done to route resets for IPv6 link local addresses. It was a
mistake to do so for global addresses. The patch fixes this as well.

Actually, the problem appears to be even more serious than guaranteed
loss of resets.  As reported by Sergey Soloviev <sol@eqv.ru>, those
misrouted resets create a lot of arp traffic and huge amount of
unresolved arp entires putting down to knees NAT firewalls which use
asymmetric routing.

Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
2012-10-12 13:52:40 -04:00
Eric Dumazet
863472454c ipv6: gro: fix PV6_GRO_CB(skb)->proto problem
It seems IPV6_GRO_CB(skb)->proto can be destroyed in skb_gro_receive()
if a new skb is allocated (to serve as an anchor for frag_list)

We copy NAPI_GRO_CB() only (not the IPV6 specific part) in :

*NAPI_GRO_CB(nskb) = *NAPI_GRO_CB(p);

So we leave IPV6_GRO_CB(nskb)->proto to 0 (fresh skb allocation) instead
of IPPROTO_TCP (6)

ipv6_gro_complete() isnt able to call ops->gro_complete()
[ tcp6_gro_complete() ]

Fix this by moving proto in NAPI_GRO_CB() and getting rid of
IPV6_GRO_CB

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-08 15:40:43 -04:00
Eric Dumazet
51ec04038c ipv6: GRO should be ECN friendly
IPv4 side of the problem was addressed in commit a9e050f4e7
(net: tcp: GRO should be ECN friendly)

This patch does the same, but for IPv6 : A Traffic Class mismatch
doesnt mean flows are different, but instead should force a flush
of previous packets.

This patch removes artificial packet reordering problem.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-07 14:44:36 -04:00
Linus Torvalds
283dbd8205 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Pull networking changes from David Miller:
 "The most important bit in here is the fix for input route caching from
  Eric Dumazet, it's a shame we couldn't fully analyze this in time for
  3.6 as it's a 3.6 regression introduced by the routing cache removal.

  Anyways, will send quickly to -stable after you pull this in.

  Other changes of note:

   1) Fix lockdep splats in team and bonding, from Eric Dumazet.

   2) IPV6 adds link local route even when there is no link local
      address, from Nicolas Dichtel.

   3) Fix ixgbe PTP implementation, from Jacob Keller.

   4) Fix excessive stack usage in cxgb4 driver, from Vipul Pandya.

   5) MAC length computed improperly in VLAN demux, from Antonio
      Quartulli."

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (26 commits)
  ipv6: release reference of ip6_null_entry's dst entry in __ip6_del_rt
  Remove noisy printks from llcp_sock_connect
  tipc: prevent dropped connections due to rcvbuf overflow
  silence some noisy printks in irda
  team: set qdisc_tx_busylock to avoid LOCKDEP splat
  bonding: set qdisc_tx_busylock to avoid LOCKDEP splat
  sctp: check src addr when processing SACK to update transport state
  sctp: fix a typo in prototype of __sctp_rcv_lookup()
  ipv4: add a fib_type to fib_info
  can: mpc5xxx_can: fix section type conflict
  can: peak_pcmcia: fix error return code
  can: peak_pci: fix error return code
  cxgb4: Fix build error due to missing linux/vmalloc.h include.
  bnx2x: fix ring size for 10G functions
  cxgb4: Dynamically allocate memory in t4_memory_rw() and get_vpd_params()
  ixgbe: add support for X540-AT1
  ixgbe: fix poll loop for FDIRCTRL.INIT_DONE bit
  ixgbe: fix PTP ethtool timestamping function
  ixgbe: (PTP) Fix PPS interrupt code
  ixgbe: Fix PTP X540 SDP alignment code for PPS signal
  ...
2012-10-06 03:11:59 +09:00
Andi Kleen
04a6f82cf0 sections: fix section conflicts in net
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-06 03:04:45 +09:00
Gao feng
6825a26c2d ipv6: release reference of ip6_null_entry's dst entry in __ip6_del_rt
as we hold dst_entry before we call __ip6_del_rt,
so we should alse call dst_release not only return
-ENOENT when the rt6_info is ip6_null_entry.

and we already hold the dst entry, so I think it's
safe to call dst_release out of the write-read lock.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-04 16:00:07 -04:00
Nicolas Dichtel
62b54dd915 ipv6: don't add link local route when there is no link local address
When an address is added on loopback (ip -6 a a 2002::1/128 dev lo), a route
to fe80::/64 is added in the main table:
  unreachable fe80::/64 dev lo  proto kernel  metric 256  error -101

This route does not match any prefix (no fe80:: address on lo). In fact,
addrconf_dev_config() will not add link local address because this function
filters interfaces by type. If the link local address is added manually, the
route to the link local prefix will be automatically added by
addrconf_add_linklocal().
Note also, that this route is not deleted when the address is removed.

After looking at the code, it seems that addrconf_add_lroute() is redundant with
addrconf_add_linklocal(), because this function will add the link local route
when the link local address is configured.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-02 22:36:23 -04:00
Eric Dumazet
861b650101 tcp: gro: add checksuming helpers
skb with CHECKSUM_NONE cant currently be handled by GRO, and
we notice this deep in GRO stack in tcp[46]_gro_receive()

But there are cases where GRO can be a benefit, even with a lack
of checksums.

This preliminary work is needed to add GRO support
to tunnels.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-01 17:00:27 -04:00
Nicolas Dichtel
64c6d08e64 ipv6: del unreachable route when an addr is deleted on lo
When an address is added on loopback (ip -6 a a 2002::1/128 dev lo), two routes
are added:
 - one in the local table:
    local 2002::1 via :: dev lo  proto none  metric 0
 - one the in main table (for the prefix):
    unreachable 2002::1 dev lo  proto kernel  metric 256  error -101

When the address is deleted, the route inserted in the main table remains
because we use rt6_lookup(), which returns NULL when dst->error is set, which
is the case here! Thus, it is better to use ip6_route_lookup() to avoid this
kind of filter.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-01 16:49:23 -04:00
Lin Ming
188c517a05 ipv6: return errno pointers consistently for fib6_add_1()
fib6_add_1() should consistently return errno pointers,
rather than a mixture of NULL and errno pointers.

Signed-off-by: Lin Ming <mlin@ss.pku.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-28 18:48:28 -04:00
David S. Miller
6a06e5e1bb Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
	drivers/net/team/team.c
	drivers/net/usb/qmi_wwan.c
	net/batman-adv/bat_iv_ogm.c
	net/ipv4/fib_frontend.c
	net/ipv4/route.c
	net/l2tp/l2tp_netlink.c

The team, fib_frontend, route, and l2tp_netlink conflicts were simply
overlapping changes.

qmi_wwan and bat_iv_ogm were of the "use HEAD" variety.

With help from Antonio Quartulli.

Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-28 14:40:49 -04:00
Eric Dumazet
bcc452935d ipv6: gre: remove ip6gre_header_parse()
dev_parse_header() callers provide 8 bytes of storage,
so it's not possible to store an IPv6 address.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-27 18:49:22 -04:00
Konstantin Khlebnikov
4b7cc7fc26 nf_defrag_ipv6: fix oops on module unloading
fix copy-paste error introduced in linux-next commit
"ipv6: add a new namespace for nf_conntrack_reasm"

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Amerigo Wang <amwang@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Acked-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-27 18:14:55 -04:00
stephen hemminger
eccc1bb8d4 tunnel: drop packet if ECN present with not-ECT
Linux tunnels were written before RFC6040 and therefore never
implemented the corner case of ECN getting set in the outer header
and the inner header not being ready for it.

Section 4.2.  Default Tunnel Egress Behaviour.
 o If the inner ECN field is Not-ECT, the decapsulator MUST NOT
      propagate any other ECN codepoint onwards.  This is because the
      inner Not-ECT marking is set by transports that rely on dropped
      packets as an indication of congestion and would not understand or
      respond to any other ECN codepoint [RFC4774].  Specifically:

      *  If the inner ECN field is Not-ECT and the outer ECN field is
         CE, the decapsulator MUST drop the packet.

      *  If the inner ECN field is Not-ECT and the outer ECN field is
         Not-ECT, ECT(0), or ECT(1), the decapsulator MUST forward the
         outgoing packet with the ECN field cleared to Not-ECT.

This patch moves the ECN decap logic out of the individual tunnels
into a common place.

It also adds logging to allow detecting broken systems that
set ECN bits incorrectly when tunneling (or an intermediate
router might be changing the header).

Overloads rx_frame_error to keep track of ECN related error.

Thanks to Chris Wright who caught this while reviewing the new VXLAN
tunnel.

This code was tested by injecting faulty logic in other end GRE
to send incorrectly encapsulated packets.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-27 18:12:37 -04:00
stephen hemminger
b0558ef24a xfrm: remove extranous rcu_read_lock
The handlers for xfrm_tunnel are always invoked with rcu read lock
already.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-27 18:12:37 -04:00
stephen hemminger
0c5794a66c gre: remove unnecessary rcu_read_lock/unlock
The gre function pointers for receive and error handling are
always called (from gre.c) with rcu_read_lock already held.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-27 18:12:37 -04:00
Eric Dumazet
96af69ea2a ipv6: mip6: fix mip6_mh_filter()
mip6_mh_filter() should not modify its input, or else its caller
would need to recompute ipv6_hdr() if skb->head is reallocated.

Use skb_header_pointer() instead of pskb_may_pull()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-25 16:04:44 -04:00
Eric Dumazet
1b05c4b50e ipv6: raw: fix icmpv6_filter()
icmpv6_filter() should not modify its input, or else its caller
would need to recompute ipv6_hdr() if skb->head is reallocated.

Use skb_header_pointer() instead of pskb_may_pull() and
change the prototype to make clear both sk and skb are const.

Also, if icmpv6 header cannot be found, do not deliver the packet,
as we do in IPv4.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-25 13:21:49 -04:00
Eric Dumazet
5640f76858 net: use a per task frag allocator
We currently use a per socket order-0 page cache for tcp_sendmsg()
operations.

This page is used to build fragments for skbs.

Its done to increase probability of coalescing small write() into
single segments in skbs still in write queue (not yet sent)

But it wastes a lot of memory for applications handling many mostly
idle sockets, since each socket holds one page in sk->sk_sndmsg_page

Its also quite inefficient to build TSO 64KB packets, because we need
about 16 pages per skb on arches where PAGE_SIZE = 4096, so we hit
page allocator more than wanted.

This patch adds a per task frag allocator and uses bigger pages,
if available. An automatic fallback is done in case of memory pressure.

(up to 32768 bytes per frag, thats order-3 pages on x86)

This increases TCP stream performance by 20% on loopback device,
but also benefits on other network devices, since 8x less frags are
mapped on transmit and unmapped on tx completion. Alexander Duyck
mentioned a probable performance win on systems with IOMMU enabled.

Its possible some SG enabled hardware cant cope with bigger fragments,
but their ndo_start_xmit() should already handle this, splitting a
fragment in sub fragments, since some arches have PAGE_SIZE=65536

Successfully tested on various ethernet devices.
(ixgbe, igb, bnx2x, tg3, mellanox mlx4)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ben Hutchings <bhutchings@solarflare.com>
Cc: Vijay Subramanian <subramanian.vijay@gmail.com>
Cc: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Vijay Subramanian <subramanian.vijay@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-24 16:31:37 -04:00
David S. Miller
ae4735166e Merge branch 'master' of git://1984.lsi.us.es/nf-next
Pablo Neira Ayuso says:

====================
This patchset contains updates for your net-next tree, they are:

* Mostly fixes for the recently pushed IPv6 NAT support:

- Fix crash while removing nf_nat modules from Patrick McHardy.
- Fix unbalanced rcu_read_unlock from Ulrich Weber.
- Merge NETMAP and REDIRECT into one single xt_target module, from
  Jan Engelhardt.
- Fix Kconfig for IPv6 NAT, which allows inconsistent configurations,
  from myself.

* Updates for ipset, all of the from Jozsef Kadlecsik:

- Add the new "nomatch" option to obtain reverse set matching.
- Support for /0 CIDR in hash:net,iface set type.
- One non-critical fix for a rare crash due to pass really
  wrong configuration parameters.
- Coding style cleanups.
- Sparse fixes.
- Add set revision supported via modinfo.i

* One extension for the xt_time match, to support matching during
  the transition between two days with one single rule, from
  Florian Westphal.

* Fix maximum packet length supported by nfnetlink_queue and add
  NFQA_CAP_LEN attribute, from myself.

You can notice that this batch contains a couple of fixes that may
go to 3.6-rc but I don't consider them critical to push them:

* The ipset fix for the /0 cidr case, which is triggered with one
  inconsistent command line invocation of ipset.

* The nfnetlink_queue maximum packet length supported since it requires
  the new NFQA_CAP_LEN attribute to provide a full workaround for the
  described problem.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-24 15:42:04 -04:00
Neal Cardwell
016818d076 tcp: TCP Fast Open Server - take SYNACK RTT after completing 3WHS
When taking SYNACK RTT samples for servers using TCP Fast Open, fix
the code to ensure that we only call tcp_valid_rtt_meas() after we
receive the ACK that completes the 3-way handshake.

Previously we were always taking an RTT sample in
tcp_v4_syn_recv_sock(). However, for TCP Fast Open connections
tcp_v4_conn_req_fastopen() calls tcp_v4_syn_recv_sock() at the time we
receive the SYN. So for TFO we must wait until tcp_rcv_state_process()
to take the RTT sample.

To fix this, we wait until after TFO calls tcp_v4_syn_recv_sock()
before we set the snt_synack timestamp, since tcp_synack_rtt_meas()
already ensures that we only take a SYNACK RTT sample if snt_synack is
non-zero. To be careful, we only take a snt_synack timestamp when
a SYNACK transmit or retransmit succeeds.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-22 15:47:10 -04:00
Neal Cardwell
623df484a7 tcp: extract code to compute SYNACK RTT
In preparation for adding another spot where we compute the SYNACK
RTT, extract this code so that it can be shared.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-22 15:47:10 -04:00
Wei Yongjun
f950c0ecc7 ipv6: fix return value check in fib6_add()
In case of error, the function fib6_add_1() returns ERR_PTR()
or NULL pointer. The ERR_PTR() case check is missing in fib6_add().

dpatch engine is used to generated this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-21 13:43:52 -04:00
Jan Engelhardt
2cbc78a29e netfilter: combine ipt_REDIRECT and ip6t_REDIRECT
Combine more modules since the actual code is so small anyway that the
kmod metadata and the module in its loaded state totally outweighs the
combined actual code size.

IP_NF_TARGET_REDIRECT becomes a compat option; IP6_NF_TARGET_REDIRECT
is completely eliminated since it has not see a release yet.

Signed-off-by: Jan Engelhardt <jengelh@inai.de>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-09-21 12:12:05 +02:00
Jan Engelhardt
b3d54b3e40 netfilter: combine ipt_NETMAP and ip6t_NETMAP
Combine more modules since the actual code is so small anyway that the
kmod metadata and the module in its loaded state totally outweighs the
combined actual code size.

IP_NF_TARGET_NETMAP becomes a compat option; IP6_NF_TARGET_NETMAP
is completely eliminated since it has not see a release yet.

Signed-off-by: Jan Engelhardt <jengelh@inai.de>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-09-21 12:11:08 +02:00