The inclusion of `net/gnrc.h` in `net/gnrc/mac/types.h` header makes it
impossible to include the `net/gnrc/netif.h` header within
`net/gnrc/netif/hdr.h`, due to `net/gnrc/mac/types.h` being included
with `net/gnrc/netif/mac.h` (which is included in `net/gnrc/netif.h`)
Check for:
- if it exists (critical error condition -- non-IPv6 headers should
not trigger these functions) => assert
- if it has a multicast source (that shouldn't really happen but
people might try weird stuff ;-)
- if it has an unspecified source (can't determine receiver of error
message => don't send it, don't build it)
Empty array uint8_t data[] is not allowed in ISO-C++. Replacement: function coap_hdr_data_ptr, which handles
the pointer arithmetic to point where hdr.data pointed
COAP_CT_ style defines for the content types are deprecated in favour of
COAP_FORMAT_ style defines. COAP_FORMAT_ is expanded to include any
missing content type that was available with COAP_CT_.
Adds a gnrc_netif specific rawmode flag to indicate that the netdev
device is configured in raw mode. This flag is kept in sync with a
possible flag in the netdev device and should only be modified via the
setter call.
gnrc_sock_recv used to duplicate functionality of gnrc_ipv6_get_header,
but additionally checked whether the IPv6 snip is large enough.
All checks are now included in gnrc_ipv6_get_header, but as most of them
stem from programming / user errors, they were moved into asserts; this
constitutes an API change.
- add generic string put and get functions
- add location path and location query options
- add dedicated functions for getting and setting
URI query, URI path, location query, and location path
options
UDP port 0 is reserved for system usage, e.g., to tell the OS to
set a random source port. Hence, neither source nor destination
port should be 0 when transmitting. This PR adds proper asserts.
A CoAP resource is a primary object between the application
and CoAP library. The Library needs the paths, methods,
and handlers from it, so that it can call the right handler.
However, it never needs to change any of them.
The application also needs the resources. The application
may want to declare the resources as const, since it may
want to store them in flash.
This refactors reception/decoding part of `gnrc_sixlowpan_iphc` to the
more layered approach modeled in #8511. Since the reception part is
already complicated enough I decided to divide send and receive up into
separate changes.
This refactors sending/encoding part of `gnrc_sixlowpan_iphc` to the
more layered approach modeled in #8511. Since the reception part is
already was pretty complicated to refactor, I decided to divide send
and receive up into separate changes.
This will be used in the IPHC refactoring to control the reassembly
buffer as a context.
I also adapted the name of `gnrc_sixlowpan_frag_gc_rbuf()` to be in
line with the rest of the newer functions.
While the current approach for garbage collection in the 6Lo reassembly
buffer is good for best-effort handling of
*fragmented* packets and nicely RAM saving, it has the problem that
incomplete, huge datagrams can basically DoS a node, if no further
fragmented datagram is received for a while (since the packet buffer is
full and GC is not triggered).
This change adds a asynchronous GC (utilizing the existing
functionality) to the reassembly buffer, so that even if there is no new
fragmented packet received, fragments older than `RBUF_TIMEOUT` will be
removed from the reassembly buffer, freeing up the otherwise wasted
packet buffer space.
Since IPHC also manipulates the total number of bytes of a received
datagram (by decompressing it), this also needs to be exposed. I guess
I was too focused on introducing a *generic* packet buffer for a future
virtual reassembly buffer (where it isn't needed, but so isn't `pkt` to
be honest), that I totally forgot about it in #9352.
This refactors the `gnrc_sixlowpan_frag` module for the API proposed
in #8511.
The `ctx` for `gnrc_sixlowpan_frag_send()` is required to be a
`gnrc_sixlowpan_msg_frag_t` object, so IPHC can later on use it to
provide the *original* datagram size (otherwise, we would need to adapt
the API just for that, which seems to me as convoluted as this
proposal).
I also provide an expose function with a future possibility to provide
more than just one `gnrc_sixlowpan_msg_frag_t` object later on (plus
having cleaner module separation in general).
This change allows the port for local endpoint to be zero 0. If this is
the case the `sock_udp_create()` function binds the object to an
ephemeral port.
While working on #9352 I noticed that the order of members in the
`gnrc_sixlowpan_msg_frag_t` struct costs us 4 bytes in RAM due to byte
alignment. This PR fixes the order of members, so they are the most
packed.
This exposes the parts of the reassembly buffer to be usable as context
as proposed in #8511.
I only exposed *parts of* for two reasons:
1. I don't need to expose further types (like `rbuf_int_t`), that are
not of interest outside of fragmentation.
2. This allows for an easy future extension for the virtual reassembly
buffer as proposed in [[1]].
This makes this change a little bit more involved, because instead of
just renaming the type, I also need to add the usage of the `super`
member, but I think in the end this little preparation work will be
beneficial in the future.
[1]: https://tools.ietf.org/html/draft-watteyne-6lo-minimal-fragment-01#section-3
While browsing through the rendered doc, I found the precondition of
`gnrc_netreg_register()` somewhat lacking. What is a "message queue"?
`gnrc_netreg_entry_t`s have types. Does this apply for all types?
This specifies the requirement more: The calling thread **only** needs
a message queue (also provides a link to `msg_init_queue()` now for
further information), if the provided `gnrc_netreg_entry_t` is of type
`GNRC_NETREG_TYPE_DEFAULT` (i.e. thread-wise IPC).
Fix re-register when using the same token.
Handle edge cases when change token for a resource.
Only set observer and resource on initial registration.
Discuss re-registration in documentation.
Parts of [RFC4862] were already implemented when NDP via the NIB was
first implemented. This change just includes the DAD portion of
[RFC4862]. This should be enough to make RIOT fully RFC4862 compliant.
[RFC4862]: https://tools.ietf.org/html/rfc4862
The nanocoap_get function is refactored to split of the request part
into a separate function for reuse by other modules. Support for
retransmissions when the received frame is malformed is dropped as it
was broken anyway.
Reordered struct members to not waste memory due to padding.
Before:
``` C
typedef struct {
uint8_t src_l2addr_len;
uint8_t dst_l2addr_len;
kernel_pid_t if_pid; // <-- 16 bit, is aligned to 16 bit
uint8_t flags;
uint8_t __padding_byte; // <-- Inserted to fulfill padding requirements
int16_t rssi; // <-- 16 bit, is NOT aligned to 16 bit
uint8_t lqi;
uint8_t __padding_byte2;// <-- Inserted to fulfill padding requirements
} gnrc_netif_hdr_t;
```
Now:
``` C
typedef struct {
uint8_t src_l2addr_len;
uint8_t dst_l2addr_len;
kernel_pid_t if_pid; // <-- 16 bit, is aligned to 16 bit
uint8_t flags;
uint8_t lqi;
int16_t rssi; // <-- 16 bit, is aligned to 16 bit
} gnrc_netif_hdr_t;
```
When build for the `bluepill` board, the new layout reduces the size by 2 bytes.
RFC 2460 was obsoleted by RFC 8200. This PR changes the references
around, so we don't reference an obsoleted RFC ;-).
Also I'm moving these references from the old-style HTML-like format
to the newer-style Markdown-like format.
Documentation of the option types was clarified in #8655. I only noticed
after merging #8884, that `NETOPT_BLE_CTX` was not documented using
that new style. So I deliver the change myself to make it quicker.
Skald is a very small and simple, TX-only BLE stack that supports
sending advertisements only. It is useful for building all kinds
of BLE beacons with very minimal memory footprints.
With the previous fix, we only have to register addresses that are not
VALID yet on reception of router advertisements. This removes the need
for the hacky `GNRC_NETIF_FLAGS_6LO_ADDRS_REG` flag that was only
introduced to prevent unnecessary re-registration.
`gnrc_pktsnip_t` is used in `net/gnrc/sixlowpan/nd.h` but it is not
included. There were no compile errors yet, since this file is always
included with some other GNRC headers, but it might not in the future.
Non-routing 6LN can ignore the ABRO, so we can deactivate multihop
prefix and 6LoWPAN distribution altogether (since hosts do not have a
downstream hop).
