When a TCP connection is established, if there is no data exchange
between the two parties within the set time, the side that enables
TCP Keep-alive will send a TCP probe packet with the same sequence
number as the previous TCP packet. This TCP probe packet is an empty
ACK packet (the specification recommends that it should not contain
any data, but can also contain 1 nonsense byte, such as 0x00.). If
there is no response from the other side after several consecutive
probe packets are sent, it is determined that the tcp connection has
failed, and the connection is closed.
The keep-alive default parameters are aligned with Linux defaults.
Signed-off-by: Horse Ma <mawei@coltsmart.com>
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
Rework how data is queued for the TCP connections:
* net_context no longer allocates net_pkt for TCP connections. This
was not only inefficient (net_context has no knowledge of the TX
window size), but also error-prone in certain configuration (for
example when IP fragmentation was enabled, net_context may attempt
to allocate enormous packet, instead of let the data be fragmented
for the TCP stream.
* Instead, implement already defined `net_tcp_queue()` API, which
takes raw buffer and length. This allows to take TX window into
account and also better manage the allocated net_buf's (like for
example avoid allocation if there's still room in the buffer). In
result, the TCP stack will not only no longer exceed the TX window,
but also prevent empty gaps in allocated net_buf's, which should
lead to less out-of-mem issues with the stack.
* As net_pkt-based `net_tcp_queue_data()` is no longer in use, it was
removed.
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
Modify internal L4 protocols APIs, to allow to enforce checksum
calculation, regardless of the checksum HW offloading capability.
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
Add a helper function which allows to send a RST packet in response to
an unexpected TCP packet, w/o associated connection or net context.
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
rand32.h does not make much sense, since the random subsystem
provides more APIs than just getting a random 32 bits value.
Rename it to random.h and get consistently with other
subsystems.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Added a feature of socket connect
being asynchronous. If socket is set
to nonblock with O_NONBLOCK flag,
then connect() is non-blocking aswell.
App can normally poll the socket to
test when the connection is established.
Signed-off-by: Daniel Nejezchleb <dnejezchleb@hwg.cz>
There is a pending TODO regarding unifying net_tcp_unref() and
net_tcp_put(). Given that net_tcp_unref() is no longer used by the upper
layer (it should only use get/put APIs), the function can be removed
from external TCP API, as referencing/dereferencing is now only used
internally by the TCP stack.
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
To improve the performance with small chunks send, implement Nagle's
algorithm. Provide the option TCP_NODELAY to disable the algorithm.
Signed-off-by: Sjors Hettinga <s.a.hettinga@gmail.com>
In the existing the value received from the other side by the TCP options
is used as MSS for transmission. Since the MSS options are an
announcement rather then a negotionation, it is likely the receiver will
have a different and possibly bigger MSS than allowed by our side.
This allow potentially for different a MSS in the receive and transmit
path.
Directly using the received MSS could cause problems when our MSS is only
allowed to be small. At transmission, for that reason take the minimum of
the received MSS and our desired MSS to find a value compatible to both
sides of the link.
Rename the function to net_tcp_get_recv_mss to net_tcp_get_supported_mss
to better reflect its function in the new situation.
Signed-off-by: Sjors Hettinga <s.a.hettinga@gmail.com>
The semaphore is reset when TCP layer would normally reject transfer
request (either due to TX window being full or entering retransmission
mode). Once data is acnowledged, or the reatransmission is done, the
semaphore is set again.
Upper layers can monitor the semaphore with `k_poll()` instead of
waiting blindly before attempting to transmit again.
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
In order to bring consistency in-tree, migrate all subsystems code to
the new prefix <zephyr/...>. Note that the conversion has been scripted,
refer to zephyrproject-rtos#45388 for more details.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
TCP2 is no longer needed as it is the unique implementation since the
legacy one has been removed.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Remove legacy TCP stack as it is replaced by the new TCP2 stack.
The TCP2 stack has been the default stack since 2.4 release.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Comment out TCP1 specific stuff when TCP2 is enabled. This means
shuffling the code around a bit so that common code is placed at
the end. Introduce also net_tcp_foreach() function to TCP2 so that
it can be used from net-shell.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Unit tests were failing to build because random header was included by
kernel_includes.h. The problem is that rand32.h includes a generated
file that is either not generated or not included when building unit
tests. Also, it is better to limit the scope of this file to where it is
used.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Allow user to disable native IP stack and use offloaded IP
stack instead. It is also possible to enable both at the same
time if needed.
Fixes#18105
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
And also to the relevant callbacks.
That parameter is not used anywhere so it is useless.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
Make sure that network related functions are always documented.
This means keeping the prototype and possible stub together.
Fixes#12615
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
It is now useless as the only function using it
(net_pkt_set_appdata_values) got removed.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
As we are adding more protocol families and protocol types
to connection handlers, some values might be same across
different types. Current connection handler only stores
proto type to match the handler, which is not enough if
we add more types. Also combination of family and types
may vary too. So adding family to connection handler to
figure out best match.
Also changing proto variable in net_conn from u8_t to u16_t.
net_context has 16 bit proto.
Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>
Only next to be removed functions like net_tcp_set_checksum() are left
untouched. All the rest is switched.
Adding net_tcp_finalize() to follow the same logic as for UDP and else.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This proovse to drastically reduce runtime overhead as it does not need
to parse IP nor TCP header all over again in a lot of places.
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
These were at most set, but never used. They appear to be artifacts
of importing code from the FNET stack.
Addresses: #9570
Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Move struct members around in networking code so that we avoid
unnecessary holes inside structs. No functionality changes by
this commit.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Similar to UDP, some drivers can make use of the following functions:
net_tcp_get_hdr()
net_tcp_set_hdr()
Let's expose them as <net/tcp.h> and change all internal references
to "tcp_internal.h".
Signed-off-by: Michael Scott <michael@opensourcefoundries.com>
