The router used to send an ARP request for a packet before allocating the
corresponding ARP waiter. If the ARP waiter could not be allocated due to
resource exhaustion plus emergency free failed, the packet got dropped and the
router had produced unnecessary network traffic. The commit fixes this by
sending only after successful allocation.
Ref #4534
The previous default packet-batch count of 150 (<config
max_packets_per_signal>) was choosen with the only goal of preventing
starvation by huge amounts of packets from one session.
However, there is something else to keep in mind. A packet that is found to
require ARP sends an ARP request and becomes blocked after having consumed
resources. This means, that, in the worst case, the router used to send 150 ARP
requests and consume resources 150 times before making it even possible for the
outer world to react and cause resources to be freed.
With this additional scenario in mind, the default batch size should be
significantly lower.
Ref #4534
poll(2) needs to handle invalid file descriptors in the pollfd struct,
specifically -1 as it may be used to disable entries in the fds[] array.
Fix a possible nullptr dereference by checking the File_descriptor
pointer returned by find_by_libc_fd() for validity and skip processing
of any unresolved FDs, effectively implementing standard POSIX
semantics.
Fixes#5249
This patch removes the exception formerly thrown by 'Cpu_thread::state'
and turns the 'Thread_state' structure into a plain compound type w/o a
constructor.
Issue #5245Fixes#5250
With libxml2 >= 2.13, the `-path` argument can no longer be used for
setting search paths for xsd files. Instead, we use an XML catalog to
replace genode:// URIs with absolute paths.
Fixes#5248
This patch replaces exceptions of the PD session RPC interface with
result types.
The change of the quota-transfer RPC functions required the adaptation
of base/quota_transfer.h and base/child.h.
The 'alloc_signal_source' method has been renamed to 'signal_source'
to avoid an exceedingly long name of the corresponding result type.
The Pd_session::map function takes a 'Virt_range' instead of basic-type
arguments.
The 'Signal_source_capability' alias for 'Capability<Signal_source>' has
been removed.
Issue #5245
So far, this test used dynamic_rom for the re-configuration of the nic router
and tested for the expected ping results by inspecting the log with the run
tool. However, this approach had two issues:
* Timing differs significantly on different targets and so the dynamic_rom had
the difficult task of compensating with heuristics without bloating the test
duration too much.
* In case of a failing test, it was difficult to determine the cause as the
test kept running and produced output for quite some time and there was also
no specific error message but only a generic timeout.
These two issues are now fixed by introducing a test component that listens to
the ping-result report and manages the nic router configuration. The new
component exits early on failure and provides information on the error
circumstances. Furthermore, the component advances to the next test step only
after having seen the expected result of the active test step and thereby
removes the need for heuristics about target timing.
Fixes#5192
This patch updates the signal API to avoid raw pointers, and
replaces the Context_already_in_use and Context_not_associated
exceptions by diagnostic messages.
Fixes#5247
The router used to ignore the value of the <report quota=".."/> attribute when
it came to determining whether an interface's report is empty or not.
Therefore, merely configuring <report quota="yes"/> didn't cause interfaces
(and their quota) to show up in the report. Instead, interface quota was
reported as side effect of <report stats="yes"/>. The commit fixes this
inconsistency with the README.
The only object that is dynamically allocated by a network interface and that
was not equipped with a self-destruct timeout was the ARP waiter. This commit
closes this gap by adding a timeout to each ARP waiter that is set to 10
seconds by default but can be configured via the new <config> attribute
'arp_request_timeout_sec'.
Ref #4729
RFCs recommend to keep TCP connections for a certain time even after they
finished a close handshake, AFAIK, in order to be able to recognize astray
packets when they arrive later. This seems overambitious especially when in
the context of the router where session quota is pretty limited. Therefore,
this commit drops this final timeout and drops closed connections immediately.
Ref #4729
The previous value of 60 seconds was never observed in real-time scenarios and
UDP, for instance always used a timeout of 30 seconds without causing issues.
Note that this applies only to TCP connections in a state other than
ESTABLISHED, i.e., while it is still safe to early-drop the connection.
Ref #4729
The TCP connection state "ESTABLISHED" (in the router "OPEN") is a privileged
one for peers because it lasts very long without any peer interaction (in the
NIC router it's only 10 minutes, but RFCs recommend not less than 2 hours and
4 minutes). Furthermore, TCP connections in this state are normally not
available for early-drop on resource exhaustion. This means that this state
binds resources to a connection potentially for a long time without the option
of regaining them under stress. Therefore, this state should be entered with
care.
Up to now, the router marked a TCP connection with this state as soon as it had
seen one matching packet in both directions, which is rather quick. However,
implementing a very precise tracking of the exact TCP states of both peers and
only marking the connection "ESTABLISHED" when both peers are "ESTABLISHED" is
a difficult task with lots of corner cases.
That said, this commit implements a compromise. The router now has two flags
for each peer of a TCP connection - FIN sent and FIN acked - and sets them
according to the observed TCP flags. The "ESTABLISHED" state is entered only
when FIN acked is set for both peers (without having observed an RST or FIN
flag meanwhile).
Ref #4729
The Reference and Const_reference utility were introduced in order to express
that something is a reference (no null value) but can be changed dynamically
(not possible with built-in C++ references). However, the idea of preventing
every possibility for null pointer faults, with which the router was built
initially, has not prevailed and using pointers instead of the utility saves
logic and makes the code more readable to other C++ developers.
Ref #4729
The deinitialization method of Domain used to rely on Domain::with_dhcp_server
in order to dissolve and destroy a present DHCP server. However, this method
skipped calling its functor argument also when there was a DHCP server but an
invalid one. This commt replaces the with_dhcp_server with a pointer null-check
in order to fix the leak.
Ref #4729
Re-implements an emergency freeing of resources on exhaustion of session quota.
In contrast to the past one, the new algorithm is executed directly where the
exhaustion occurs. Instead of interupting the packet handling and restart it
from the beginning after the freeing action, packet handling is now continued
at the point of exhaustion (if enough resources could be freed). Furthermore,
the new algorithm frees only 100 objects (instead of 1024) at a max as we found
this to better match real-life observations. And finally, the router now drops
ICMP first, then UDP, then TCP - as this better reflects priorities - and
refrains from dropping TCP connections in the ESTABLISHED state. If the router
cannot free a sufficient amount of resources, the packet that caused the
exhaustion is dropped with a warning (verbose_packet_drop="yes").
Ref #4729
Remove the use of C++ exception as much as possible from the router as C++
exception handling can be resource intensive and can make code hard to
understand.
This also removes the garbage collection that the router used to do when a
session ran out of quota. This is motivated by the fact that the garbage
collection was rather simple and removed connection states regardless of their
current state, thereby causing broken connections. The change is part of this
commit as the approach to integrating garbage collection relied strongly on
exception handling.
The user story behind removing garbage collection: The router emergency-dropped
an established TCP connection (with NAPT) and on the next matching packet
re-created it with a different NAPT port, thereby breaking the connection. With
this commit, existing connections are prioritized over new ones during resource
exhaustion and the packets that attempt to create a new connection in such a
state are dropped with a warning in the log (verbose_packet_drop="yes").
Note that the state resolves itself with time as existing connections time out
or are closed by peers.
Ref #4729
Reserved memory regions must be excluded from the corresponding DMA
allocators irrespective of whether the device is in use. Otherwise, an
early allocation of DMA buffers may use the reserved memory regions of a
late acquired device.
Fixes#5232
Add special handling for root bridge access for
12th Gen Framework laptop and Thinkpad X1 Nano Gen2
to avoid bogus MMIO memory accesses as seen in #5234 and #4643.
Fixes#5234
Based on not emulated and therby wrong values, acpica calculates a
physical address which points to somewhere. Remove this hack from core and
try to emulate accesses inside acpica where necessary.
Issue #4643
Issue #5234
This exception got introduced as a mere convenience for implementers of
'Child_policy' but required a special case in the base library.
Following the goal of eliminating exceptions from the base system,
this patch removes it by making a server_id_space mandatory.
Issue #5245
as setup by firmware after boot. The information will/can be used by the
platform driver to re-program bridges after a system suspend/resume cycle.
Issue #5241
