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Merge tag 'rxrpc-rewrite-20160615' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
David Howells says:
====================
rxrpc: Rework endpoint record handling
Here's the next part of the AF_RXRPC rewrite. In this set I rework
endpoint record handling. There are two types of endpoint record, local
and peer. The local endpoint record is used as an anchor for the transport
socket that AF_RXRPC uses (at the moment a UDP socket). Local endpoints
can be shared between AF_RXRPC sockets under certain restricted
circumstances.
The peer endpoint is a record of the remote end. It is (or will be) used
to keep track MTU and RTT values and, with these changes, is used to find
the call(s) to abort when a network error occurs.
The following significant changes are made:
(1) The local endpoint event handling code is split out into its own file.
(2) The local endpoint list bottom half-excluding spinlock is removed as
things are arranged such that sk_user_data will not change whilst the
transport socket callbacks are in progress.
(3) Local endpoints can now only be shared if they have the same transport
address (as before) and have a local service ID of 0 (ie. they're not
listening for incoming calls). This prevents callbacks from a server
to one process being picked up by another process.
(4) Local endpoint destruction is now accomplished by the same work item
as processes events, meaning that the destructor doesn't need to wait
for the event processor.
(5) Peer endpoints are now held in a hash table rather than a flat list.
(6) Peer endpoints are now destroyed by RCU rather than by work item.
(7) Peer endpoints are now differentiated by local endpoint and remote
transport port in addition to remote transport address and transport
type and family.
This means that a firewall that excludes access between a particular
local port and remote port won't cause calls to be aborted that use a
different port pair.
(8) Error report handling now no longer assumes that the source is always
an IPv4 ICMP message from a UDP port and has assumptions that an ICMP
message comes from an IPv4 socket removed. At some point IPv6 support
will be added.
(9) Peer endpoints rather than local endpoints are now the anchor point
for distributing network error reports.
(10) Both types of endpoint records are now disposed of as soon as all
references to them are gone. There is less hanging around and once
their usage counts hit zero, records can no longer be resurrected.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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