Pushing original fragments through causes several problems. For example
for matching, frags may not be matched correctly. Take following
example:
<example>
On HOSTA do:
ip6tables -I INPUT -p icmpv6 -j DROP
ip6tables -I INPUT -p icmpv6 -m icmp6 --icmpv6-type 128 -j ACCEPT
and on HOSTB you do:
ping6 HOSTA -s2000 (MTU is 1500)
Incoming echo requests will be filtered out on HOSTA. This issue does
not occur with smaller packets than MTU (where fragmentation does not happen)
</example>
As was discussed previously, the only correct solution seems to be to use
reassembled skb instead of separete frags. Doing this has positive side
effects in reducing sk_buff by one pointer (nfct_reasm) and also the reams
dances in ipvs and conntrack can be removed.
Future plan is to remove net/ipv6/netfilter/nf_conntrack_reasm.c
entirely and use code in net/ipv6/reassembly.c instead.
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
If reassembled packet would fit into outdev MTU, it is not fragmented
according the original frag size and it is send as single big packet.
The second case is if skb is gso. In that case fragmentation does not happen
according to the original frag size.
This patch fixes these.
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
As the rfc 4191 said, the Router Preference and Lifetime values in a
::/0 Route Information Option should override the preference and lifetime
values in the Router Advertisement header. But when the kernel deals with
a ::/0 Route Information Option, the rt6_get_route_info() always return
NULL, that means that overriding will not happen, because those default
routers were added without flag RTF_ROUTEINFO in rt6_add_dflt_router().
In order to deal with that condition, we should call rt6_get_dflt_router
when the prefix length is 0.
Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
If the last RFC 6437 does not give any constraints
for lifetime of flow labels, the previous RFC 3697
spoke of a minimum of 120 seconds between
reattribution of a flow label.
The maximum linger is currently set to 60 seconds
and does not allow this configuration without
CAP_NET_ADMIN right.
This patch increase the maximum linger to 150
seconds, allowing more flexibility to standard
users.
Signed-off-by: Florent Fourcot <florent.fourcot@enst-bretagne.fr>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
It is already possible to set/put/renew a label
with IPV6_FLOWLABEL_MGR and setsockopt. This patch
add the possibility to get information about this
label (current value, time before expiration, etc).
It helps application to take decision for a renew
or a release of the label.
v2:
* Add spin_lock to prevent race condition
* return -ENOENT if no result found
* check if flr_action is GET
v3:
* move the spin_lock to protect only the
relevant code
Signed-off-by: Florent Fourcot <florent.fourcot@enst-bretagne.fr>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Now rt6_alloc_cow() is only called by ip6_pol_route() when
rt->rt6i_flags doesn't contain both RTF_NONEXTHOP and RTF_GATEWAY,
and rt->rt6i_flags hasn't been changed in ip6_rt_copy().
So there is no neccessary to judge whether rt->rt6i_flags contains
RTF_GATEWAY or not.
Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Commit 1e2bd517c1 ("udp6: Fix udp
fragmentation for tunnel traffic.") changed the calculation if
there is enough space to include a fragment header in the skb from a
skb->mac_header dervived one to skb_headroom. Because we already peeled
off the skb to transport_header this is wrong. Change this back to check
if we have enough room before the mac_header.
This fixes a panic Saran Neti reported. He used the tbf scheduler which
skb_gso_segments the skb. The offsets get negative and we panic in memcpy
because the skb was erroneously not expanded at the head.
Reported-by: Saran Neti <Saran.Neti@telus.com>
Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
The code of flow label in Linux Kernel follows
the rules of RFC 1809 (an informational one) for
conditions on flow label sharing. There rules are
not in the last proposed standard for flow label
(RFC 6437), or in the previous one (RFC 3697).
Since this code does not follow any current or
old standard, we can remove it.
With this removal, the ipv6_opt_cmp function is
now a dead code and it can be removed too.
Changelog to v1:
* add justification for the change
* remove the condition on IPv6 options
[ Remove ipv6_hdr_cmp and it is now unused as well. -DaveM ]
Signed-off-by: Florent Fourcot <florent.fourcot@enst-bretagne.fr>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Pablo Neira Ayuso says:
====================
This is another batch containing Netfilter/IPVS updates for your net-next
tree, they are:
* Six patches to make the ipt_CLUSTERIP target support netnamespace,
from Gao feng.
* Two cleanups for the nf_conntrack_acct infrastructure, introducing
a new structure to encapsulate conntrack counters, from Holger
Eitzenberger.
* Fix missing verdict in SCTP support for IPVS, from Daniel Borkmann.
* Skip checksum recalculation in SCTP support for IPVS, also from
Daniel Borkmann.
* Fix behavioural change in xt_socket after IP early demux, from
Florian Westphal.
* Fix bogus large memory allocation in the bitmap port set type in ipset,
from Jozsef Kadlecsik.
* Fix possible compilation issues in the hash netnet set type in ipset,
also from Jozsef Kadlecsik.
* Define constants to identify netlink callback data in ipset dumps,
again from Jozsef Kadlecsik.
* Use sock_gen_put() in xt_socket to replace xt_socket_put_sk,
from Eric Dumazet.
* Improvements for the SH scheduler in IPVS, from Alexander Frolkin.
* Remove extra delay due to unneeded rcu barrier in IPVS net namespace
cleanup path, from Julian Anastasov.
* Save some cycles in ip6t_REJECT by skipping checksum validation in
packets leaving from our stack, from Stanislav Fomichev.
* Fix IPVS_CMD_ATTR_MAX definition in IPVS, larger that required, from
Julian Anastasov.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Conflicts:
drivers/net/ethernet/emulex/benet/be.h
drivers/net/netconsole.c
net/bridge/br_private.h
Three mostly trivial conflicts.
The net/bridge/br_private.h conflict was a function signature (argument
addition) change overlapping with the extern removals from Joe Perches.
In drivers/net/netconsole.c we had one change adjusting a printk message
whilst another changed "printk(KERN_INFO" into "pr_info(".
Lastly, the emulex change was a new inline function addition overlapping
with Joe Perches's extern removals.
Signed-off-by: David S. Miller <davem@davemloft.net>
Conflicts:
net/xfrm/xfrm_policy.c
Minor merge conflict in xfrm_policy.c, consisting of overlapping
changes which were trivial to resolve.
Signed-off-by: David S. Miller <davem@davemloft.net>
Steffen Klassert says:
====================
1) Fix a possible race on ipcomp scratch buffers because
of too early enabled siftirqs. From Michal Kubecek.
2) The current xfrm garbage collector threshold is too small
for some workloads, resulting in bad performance on these
workloads. Increase the threshold from 1024 to 32768.
3) Some codepaths might not have a dst_entry attached to the
skb when calling xfrm_decode_session(). So add a check
to prevent a null pointer dereference in this case.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
On some codepaths the skb does not have a dst entry
when xfrm_decode_session() is called. So check for
a valid skb_dst() before dereferencing the device
interface index. We use 0 as the device index if
there is no valid skb_dst(), or at reverse decoding
we use skb_iif as device interface index.
Bug was introduced with git commit bafd4bd4dc
("xfrm: Decode sessions with output interface.").
Reported-by: Meelis Roos <mroos@linux.ee>
Tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
After reading the function rt6_check_neigh(), we can
know that the RT6_NUD_FAIL_SOFT can be returned only
when the IS_ENABLE(CONFIG_IPV6_ROUTER_PREF) is false.
so in function find_match(), there is no need to execute
the statement !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF).
Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
The code for privacy extentions is very mature, and making it
configurable only gives marginal memory/code savings in exchange
for obfuscation and hard to read code via CPP ifdef'ery.
Signed-off-by: David S. Miller <davem@davemloft.net>
With the removal of the routing cache, we lost the
option to tweak the garbage collector threshold
along with the maximum routing cache size. So git
commit 703fb94ec ("xfrm: Fix the gc threshold value
for ipv4") moved back to a static threshold.
It turned out that the current threshold before we
start garbage collecting is much to small for some
workloads, so increase it from 1024 to 32768. This
means that we start the garbage collector if we have
more than 32768 dst entries in the system and refuse
new allocations if we are above 65536.
Reported-by: Wolfgang Walter <linux@stwm.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
On receiving a packet too big icmp error we check if our current cached
dst_entry in the socket is still valid. This validation check did not
care about the expiration of the (cached) route.
The error path I traced down:
The socket receives a packet too big mtu notification. It still has a
valid dst_entry and thus issues the ip6_rt_pmtu_update on this dst_entry,
setting RTF_EXPIRE and updates the dst.expiration value (which could
fail because of not up-to-date expiration values, see previous patch).
In some seldom cases we race with a) the ip6_fib gc or b) another routing
lookup which would result in a recreation of the cached rt6_info from its
parent non-cached rt6_info. While copying the rt6_info we reinitialize the
metrics store by copying it over from the parent thus invalidating the
just installed pmtu update (both dsts use the same key to the inetpeer
storage). The dst_entry with the just invalidated metrics data would
just get its RTF_EXPIRES flag cleared and would continue to stay valid
for the socket.
We should have not issued the pmtu update on the already expired dst_entry
in the first placed. By checking the expiration on the dst entry and
doing a relookup in case it is out of date we close the race because
we would install a new rt6_info into the fib before we issue the pmtu
update, thus closing this race.
Not reliably updating the dst.expire value was fixed by the patch "ipv6:
reset dst.expires value when clearing expire flag".
Reported-by: Steinar H. Gunderson <sgunderson@bigfoot.com>
Reported-by: Valentijn Sessink <valentyn@blub.net>
Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Tested-by: Valentijn Sessink <valentyn@blub.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Defer the fragmentation hash secret initialization for IPv6 like the
previous patch did for IPv4.
Because the netfilter logic reuses the hash secret we have to split it
first. Thus introduce a new nf_hash_frag function which takes care to
seed the hash secret.
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Pablo Neira Ayuso says:
====================
The following patchset contains three netfilter fixes for your net
tree, they are:
* A couple of fixes to resolve info leak to userspace due to uninitialized
memory area in ulogd, from Mathias Krause.
* Fix instruction ordering issues that may lead to the access of
uninitialized data in x_tables. The problem involves the table update
(producer) and the main packet matching (consumer) routines. Detected in
SMP ARMv7, from Will Deacon.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Conflicts:
drivers/net/usb/qmi_wwan.c
include/net/dst.h
Trivial merge conflicts, both were overlapping changes.
Signed-off-by: David S. Miller <davem@davemloft.net>
Don't verify checksum for outgoing packets because checksum calculation
may be done by the device.
Without this patch:
$ ip6tables -I OUTPUT -p tcp --dport 80 -j REJECT --reject-with tcp-reset
$ time telnet ipv6.google.com 80
Trying 2a00:1450:4010:c03::67...
telnet: Unable to connect to remote host: Connection timed out
real 0m7.201s
user 0m0.000s
sys 0m0.000s
With the patch applied:
$ ip6tables -I OUTPUT -p tcp --dport 80 -j REJECT --reject-with tcp-reset
$ time telnet ipv6.google.com 80
Trying 2a00:1450:4010:c03::67...
telnet: Unable to connect to remote host: Connection refused
real 0m0.085s
user 0m0.000s
sys 0m0.000s
Signed-off-by: Stanislav Fomichev <stfomichev@yandex-team.ru>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
