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  1. 20 2月, 2016 2 次提交
  3. 19 2月, 2016 1 次提交
  5. 17 2月, 2016 3 次提交
  7. 12 2月, 2016 3 次提交
  9. 11 2月, 2016 6 次提交
    • J
      ipv6: add option to drop unsolicited neighbor advertisements · 7a02bf89
      由 Johannes Berg 提交于 
      In certain 802.11 wireless deployments, there will be NA proxies
that use knowledge of the network to correctly answer requests.
To prevent unsolicitd advertisements on the shared medium from
being a problem, on such deployments wireless needs to drop them.

Enable this by providing an option called "drop_unsolicited_na".
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      7a02bf89
    • J
      ipv6: add option to drop unicast encapsulated in L2 multicast · abbc3043
      由 Johannes Berg 提交于 
      In order to solve a problem with 802.11, the so-called hole-196 attack,
add an option (sysctl) called "drop_unicast_in_l2_multicast" which, if
enabled, causes the stack to drop IPv6 unicast packets encapsulated in
link-layer multi- or broadcast frames. Such frames can (as an attack)
be created by any member of the same wireless network and transmitted
as valid encrypted frames since the symmetric key for broadcast frames
is shared between all stations.
Reviewed-by: NJulian Anastasov <ja@ssi.bg>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      abbc3043
    • C
      soreuseport: fast reuseport TCP socket selection · c125e80b
      由 Craig Gallek 提交于 
      This change extends the fast SO_REUSEPORT socket lookup implemented
for UDP to TCP.  Listener sockets with SO_REUSEPORT and the same
receive address are additionally added to an array for faster
random access.  This means that only a single socket from the group
must be found in the listener list before any socket in the group can
be used to receive a packet.  Previously, every socket in the group
needed to be considered before handing off the incoming packet.

This feature also exposes the ability to use a BPF program when
selecting a socket from a reuseport group.
Signed-off-by: NCraig Gallek <kraig@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      c125e80b
    • C
      inet: refactor inet[6]_lookup functions to take skb · a583636a
      由 Craig Gallek 提交于 
      This is a preliminary step to allow fast socket lookup of SO_REUSEPORT
groups.  Doing so with a BPF filter will require access to the
skb in question.  This change plumbs the skb (and offset to payload
data) through the call stack to the listening socket lookup
implementations where it will be used in a following patch.
Signed-off-by: NCraig Gallek <kraig@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      a583636a
    • C
      inet: create IPv6-equivalent inet_hash function · 496611d7
      由 Craig Gallek 提交于 
      In order to support fast lookups for TCP sockets with SO_REUSEPORT,
the function that adds sockets to the listening hash set needs
to be able to check receive address equality.  Since this equality
check is different for IPv4 and IPv6, we will need two different
socket hashing functions.

This patch adds inet6_hash identical to the existing inet_hash function
and updates the appropriate references.  A following patch will
differentiate the two by passing different comparison functions to
__inet_hash.

Additionally, in order to use the IPv6 address equality function from
inet6_hashtables (which is compiled as a built-in object when IPv6 is
enabled) it also needs to be in a built-in object file as well.  This
moves ipv6_rcv_saddr_equal into inet_hashtables to accomplish this.
Signed-off-by: NCraig Gallek <kraig@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      496611d7
    • C
      sock: struct proto hash function may error · 086c653f
      由 Craig Gallek 提交于 
      In order to support fast reuseport lookups in TCP, the hash function
defined in struct proto must be capable of returning an error code.
This patch changes the function signature of all related hash functions
to return an integer and handles or propagates this return value at
all call sites.
Signed-off-by: NCraig Gallek <kraig@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      086c653f
  11. 08 2月, 2016 1 次提交
  13. 30 1月, 2016 2 次提交
  15. 26 1月, 2016 2 次提交
  17. 21 1月, 2016 1 次提交
  19. 20 1月, 2016 1 次提交
    • E
      udp: fix potential infinite loop in SO_REUSEPORT logic · ed0dfffd
      由 Eric Dumazet 提交于 
      Using a combination of connected and un-connected sockets, Dmitry
was able to trigger soft lockups with his fuzzer.

The problem is that sockets in the SO_REUSEPORT array might have
different scores.

Right after sk2=socket(), setsockopt(sk2,...,SO_REUSEPORT, on) and
bind(sk2, ...), but _before_ the connect(sk2) is done, sk2 is added into
the soreuseport array, with a score which is smaller than the score of
first socket sk1 found in hash table (I am speaking of the regular UDP
hash table), if sk1 had the connect() done, giving a +8 to its score.

hash bucket [X] -> sk1 -> sk2 -> NULL

sk1 score = 14  (because it did a connect())
sk2 score = 6

SO_REUSEPORT fast selection is an optimization. If it turns out the
score of the selected socket does not match score of first socket, just
fallback to old SO_REUSEPORT logic instead of trying to be too smart.

Normal SO_REUSEPORT users do not mix different kind of sockets, as this
mechanism is used for load balance traffic.

Fixes: e32ea7e7 ("soreuseport: fast reuseport UDP socket selection")
Reported-by: NDmitry Vyukov <dvyukov@google.com>
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: Craig Gallek <kraigatgoog@gmail.com>
Acked-by: NCraig Gallek <kraig@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      ed0dfffd
  21. 16 1月, 2016 1 次提交
  23. 15 1月, 2016 1 次提交
  25. 12 1月, 2016 1 次提交
  27. 11 1月, 2016 2 次提交
  29. 06 1月, 2016 2 次提交
  31. 05 1月, 2016 3 次提交
    • C
      soreuseport: setsockopt SO_ATTACH_REUSEPORT_[CE]BPF · 538950a1
      由 Craig Gallek 提交于 
      Expose socket options for setting a classic or extended BPF program
for use when selecting sockets in an SO_REUSEPORT group.  These options
can be used on the first socket to belong to a group before bind or
on any socket in the group after bind.

This change includes refactoring of the existing sk_filter code to
allow reuse of the existing BPF filter validation checks.
Signed-off-by: NCraig Gallek <kraig@google.com>
Acked-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      538950a1
    • C
      soreuseport: fast reuseport UDP socket selection · e32ea7e7
      由 Craig Gallek 提交于 
      Include a struct sock_reuseport instance when a UDP socket binds to
a specific address for the first time with the reuseport flag set.
When selecting a socket for an incoming UDP packet, use the information
available in sock_reuseport if present.

This required adding an additional field to the UDP source address
equality function to differentiate between exact and wildcard matches.
The original use case allowed wildcard matches when checking for
existing port uses during bind.  The new use case of adding a socket
to a reuseport group requires exact address matching.

Performance test (using a machine with 2 CPU sockets and a total of
48 cores):  Create reuseport groups of varying size.  Use one socket
from this group per user thread (pinning each thread to a different
core) calling recvmmsg in a tight loop.  Record number of messages
received per second while saturating a 10G link.
  10 sockets: 18% increase (~2.8M -> 3.3M pkts/s)
  20 sockets: 14% increase (~2.9M -> 3.3M pkts/s)
  40 sockets: 13% increase (~3.0M -> 3.4M pkts/s)

This work is based off a similar implementation written by
Ying Cai <ycai@google.com> for implementing policy-based reuseport
selection.
Signed-off-by: NCraig Gallek <kraig@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      e32ea7e7
    • E
      udp: properly support MSG_PEEK with truncated buffers · 197c949e
      由 Eric Dumazet 提交于 
      Backport of this upstream commit into stable kernels :
89c22d8c ("net: Fix skb csum races when peeking")
exposed a bug in udp stack vs MSG_PEEK support, when user provides
a buffer smaller than skb payload.

In this case,
skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr),
                                 msg->msg_iov);
returns -EFAULT.

This bug does not happen in upstream kernels since Al Viro did a great
job to replace this into :
skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr), msg);
This variant is safe vs short buffers.

For the time being, instead reverting Herbert Xu patch and add back
skb->ip_summed invalid changes, simply store the result of
udp_lib_checksum_complete() so that we avoid computing the checksum a
second time, and avoid the problematic
skb_copy_and_csum_datagram_iovec() call.

This patch can be applied on recent kernels as it avoids a double
checksumming, then backported to stable kernels as a bug fix.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Acked-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      197c949e
  33. 29 12月, 2015 1 次提交
  35. 26 12月, 2015 1 次提交
  37. 24 12月, 2015 1 次提交
  39. 23 12月, 2015 4 次提交
  41. 19 12月, 2015 1 次提交
    • D
      net: Allow accepted sockets to be bound to l3mdev domain · 6dd9a14e
      由 David Ahern 提交于 
      Allow accepted sockets to derive their sk_bound_dev_if setting from the
l3mdev domain in which the packets originated. A sysctl setting is added
to control the behavior which is similar to sk_mark and
sysctl_tcp_fwmark_accept.

This effectively allow a process to have a "VRF-global" listen socket,
with child sockets bound to the VRF device in which the packet originated.
A similar behavior can be achieved using sk_mark, but a solution using marks
is incomplete as it does not handle duplicate addresses in different L3
domains/VRFs. Allowing sockets to inherit the sk_bound_dev_if from l3mdev
domain provides a complete solution.
Signed-off-by: NDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      6dd9a14e