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  1. 17 6月, 2016 1 次提交
  3. 16 6月, 2016 30 次提交
  5. 15 6月, 2016 9 次提交
    • D
      rxrpc: Rework local endpoint management · 4f95dd78
      由 David Howells 提交于 
      Rework the local RxRPC endpoint management.

Local endpoint objects are maintained in a flat list as before.  This
should be okay as there shouldn't be more than one per open AF_RXRPC socket
(there can be fewer as local endpoints can be shared if their local service
ID is 0 and they share the same local transport parameters).

Changes:

 (1) Local endpoints may now only be shared if they have local service ID 0
     (ie. they're not being used for listening).

     This prevents a scenario where process A is listening of the Cache
     Manager port and process B contacts a fileserver - which may then
     attempt to send CM requests back to B.  But if A and B are sharing a
     local endpoint, A will get the CM requests meant for B.

 (2) We use a mutex to handle lookups and don't provide RCU-only lookups
     since we only expect to access the list when opening a socket or
     destroying an endpoint.

     The local endpoint object is pointed to by the transport socket's
     sk_user_data for the life of the transport socket - allowing us to
     refer to it directly from the sk_data_ready and sk_error_report
     callbacks.

 (3) atomic_inc_not_zero() now exists and can be used to only share a local
     endpoint if the last reference hasn't yet gone.

 (4) We can remove rxrpc_local_lock - a spinlock that had to be taken with
     BH processing disabled given that we assume sk_user_data won't change
     under us.

 (5) The transport socket is shut down before we clear the sk_user_data
     pointer so that we can be sure that the transport socket's callbacks
     won't be invoked once the RCU destruction is scheduled.

 (6) Local endpoints have a work item that handles both destruction and
     event processing.  The means that destruction doesn't then need to
     wait for event processing.  The event queues can then be cleared after
     the transport socket is shut down.

 (7) Local endpoints are no longer available for resurrection beyond the
     life of the sockets that had them open.  As soon as their last ref
     goes, they are scheduled for destruction and may not have their usage
     count moved from 0.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
      4f95dd78
    • D
      rxrpc: Separate local endpoint event handling out into its own file · 87563616
      由 David Howells 提交于 
      Separate local endpoint event handling out into its own file preparatory to
overhauling the object management aspect (which remains in the original
file).
Signed-off-by: NDavid Howells <dhowells@redhat.com>
      87563616
    • D
      rxrpc: Use the peer record to distribute network errors · f66d7490
      由 David Howells 提交于 
      Use the peer record to distribute network errors rather than the transport
object (which I want to get rid of).  An error from a particular peer
terminates all calls on that peer.

For future consideration:

 (1) For ICMP-induced errors it might be worth trying to extract the RxRPC
     header from the offending packet, if one is returned attached to the
     ICMP packet, to better direct the error.

     This may be overkill, though, since an ICMP packet would be expected
     to be relating to the destination port, machine or network.  RxRPC
     ABORT and BUSY packets give notice at RxRPC level.

 (2) To also abort connection-level communications (such as CHALLENGE
     packets) where indicted by an error - but that requires some revamping
     of the connection event handling first.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
      f66d7490
    • D
      rxrpc: Do a little bit of tidying in the ICMP processing · fe77d5fc
      由 David Howells 提交于 
      Do a little bit of tidying in the ICMP processing code.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
      fe77d5fc
    • D
      rxrpc: Don't assume anything about the address in an ICMP packet · 1c1df86f
      由 David Howells 提交于 
      Don't assume anything about the address in an ICMP packet in
rxrpc_error_report() as the address may not be IPv4 in future, especially
since we're just printing these details.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
      1c1df86f
    • D
      rxrpc: Break MTU determination from ICMP into its own function · 1a70c05b
      由 David Howells 提交于 
      Break MTU determination from ICMP out into its own function to reduce the
complexity of the error report handler.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
      1a70c05b
    • D
      rxrpc: Rename rxrpc_UDP_error_report() to rxrpc_error_report() · abe89ef0
      由 David Howells 提交于 
      Rename rxrpc_UDP_error_report() to rxrpc_error_report() as it might get
called for something other than UDP.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
      abe89ef0
    • D
      rxrpc: Rework peer object handling to use hash table and RCU · be6e6707
      由 David Howells 提交于 
      Rework peer object handling to use a hash table instead of a flat list and
to use RCU.  Peer objects are no longer destroyed by passing them to a
workqueue to process, but rather are just passed to the RCU garbage
collector as kfree'able objects.

The hash function uses the local endpoint plus all the components of the
remote address, except for the RxRPC service ID.  Peers thus represent a
UDP port on the remote machine as contacted by a UDP port on this machine.

The RCU read lock is used to handle non-creating lookups so that they can
be called from bottom half context in the sk_error_report handler without
having to lock the hash table against modification.
rxrpc_lookup_peer_rcu() *does* take a reference on the peer object as in
the future, this will be passed to a work item for error distribution in
the error_report path and this function will cease being used in the
data_ready path.

Creating lookups are done under spinlock rather than mutex as they might be
set up due to an external stimulus if the local endpoint is a server.

Captured network error messages (ICMP) are handled with respect to this
struct and MTU size and RTT are cached here.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
      be6e6707
    • W
      act_police: rename tcf_act_police_locate() to tcf_act_police_init() · d9fa17ef
      由 WANG Cong 提交于 
      This function is just ->init(), rename it to make it obvious.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com>
Acked-by: NJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      d9fa17ef