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Apparently newer gcc versions are a bit more forgiving when assigning an
"unsigned char*" pointer to something of a different type. Let's add the
missing cast so that old gcc versions are fine, too.
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This reworks sd-ndisc and networkd substantially to support IPv6 RA much more
comprehensively. Since the API is extended quite a bit networkd has been ported
over too, and the patch is not as straight-forward as one could wish. The
rework includes:
- Support for DNSSL, RDNSS and RA routing options in sd-ndisc and networkd. Two
new configuration options have been added to networkd to make this
configurable.
- sd-ndisc now exposes an sd_ndisc_router object that encapsulates a full RA
message, and has direct, friendly acessor functions for the singleton RA
properties, as well as an iterative interface to iterate through known and
unsupported options. The router object may either be retrieved from the wire,
or generated from raw data. In many ways the sd-ndisc API now matches the
sd-lldp API, except that no implicit database of seen data is kept. (Note
that sd-ndisc actually had a half-written, but unused implementaiton of such
a store, which is removed now.)
- sd-ndisc will now collect the reception timestamps of RA, which is useful to
make sd_ndisc_router fully descriptive of what it covers.
Fixes: #1079
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Let's use usec_t internally always, when dealing with time values.
Let's use uint8_t* pointers if we are dealing with generic byte pointers.
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Whitespace doesn't hurt and helps structuring things.
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Let's better check the size before we subtract. Also, let's change the size
argument to size_t, as it cannot be signed anyway.
Finally, use EBADMSG for indicating invalid packets, like we do everywhere
else.
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Otherwise it gets too confusing whether "timeout" refers to an event source or
just a timeout time specification.
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Also make use of it where appropriate.
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There's no "client" object, in both cases. There's only "nd".
This wasn't noticed before, as the context object is currently not actually
used by the log macros.
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It's a good idea to make stopcalls idempotent, so that they become nops if the
object is already stopped.
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assert_return() should only be used to validate user-facing parameters and
state, assert() should be used for checking our own internal state and
parameters.
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After all, it's actually used for resetting the state, not only for the initial
initialization.
While we are at it, also simplify the error path for
sd_ndisc_discovery_start().
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A field "index" is not particularly precise and also might conflict with libc's
index() function definition. Also, pretty much everywhere else we call this
concept "ifindex", including in networkd, the primary user of these libraries.
Hence, let's fix this up and call this "ifindex" everywhere here too.
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Let's always check for errno being EAGAIN/EINTR the same way, and always log if
we receive weirdly short packets.
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as such
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Fixes: #2457
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This should be handled fine now by .dir-locals.el, so need to carry that
stuff in every file.
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Merge separate two error handling statements into two nested ifs.
This looks cleaner, and avoids a gcc warning about *prefix being
uninitialized.
While at it, fix identation of logging statements elsewhere in the
file.
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If the initial allocation succeeded, there is no way to
fail, so cleanup function is not necessary.
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GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
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Verify the hoplimit and that the received packet is large enough for the RA
header.
See <http://tools.ietf.org/html/rfc4861#section-6.1.2>.
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We never send packets without first knowing the link-local L3 address,
so we should always include the L2 address in RS packets.
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This happens when running our test-suite over a socketpair,
so don't fall over in that case.
Fixes issue #1952.
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See https://tools.ietf.org/html/rfc4861#section-4.2. Some routers (dnsmasq) will send packets
from global addresses, which would break the default route setup, so ignore those.
This is also what the kernel does.
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The clients may be triggered to be started repeatedly without being stopped first,
simply swallow the error rather than failing the link.
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Reported by Thomas Andersen.
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Router Discovery is a core part of IPv6, which by default is handled by the kernel.
However, the kernel implementation is meant as a fall-back, and to fully support
the protocol a userspace implementation is desired.
The protocol essentially listens for Router Advertisement packets from routers
on the local link and use these to configure the client automatically. The four
main pieces of information are: what kind (if any) of DHCPv6 configuration should
be performed; a default gateway; the prefixes that should be considered to be on
the local link; and the prefixes with which we can preform SLAAC in order to pick
a global IPv6 address.
A lot of additional information is also available, which we do not yet fully
support, but which will eventually allow us to avoid the need for DHCPv6 in the
common case.
Short-term, the reason for wanting this is in userspace was the desire to fully
track all the addresses on links we manage, and that is not possible for addresses
managed by the kernel (as the kernel does not expose to us the fact that it
manages these addresses). Moreover, we would like to support stable privacy
addresses, which will soon be mandated and the legacy MAC-based global addresses
deprecated, to do this well we need to handle the generation in userspace. Lastly,
more long-term we wish to support more RA options than what the kernel exposes.
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As the data passed is very different, we introduce four different callbacks:
- Generic - router discovery timed out or state machine stopped
- Router - router and link configuration received
- Prefix onlink - configuration for an onlink prefix received
- Prefix autonomous - configuration for to configure a SLAAC address for a prefix received
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Also, stop the state machine when we get into a broken state, rather than just notify the user.
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string-util.[ch]
There are more than enough calls doing string manipulations to deserve
its own files, hence do something about it.
This patch also sorts the #include blocks of all files that needed to be
updated, according to the sorting suggestions from CODING_STYLE. Since
pretty much every file needs our string manipulation functions this
effectively means that most files have sorted #include blocks now.
Also touches a few unrelated include files.
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Only callback on error when the statemachine is in a truly broken state. This
is now only the case when we fail to rearm a timer.
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This is unused, and in the future we will pass prefixes and prefixlengths directly
to the callbacks when needed rather than having to search for them.
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This is no longer used.
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The caller of the library is no longer notified, so triggering a timer
just to clean up is not necessary. Instead check for and clean up
invalid prefixes lazily.
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This follows the coding style, and allows some simplification to the rest of the code.
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The caller should push any lifetime information into the kernel and let the kernel handle
prefix expiration.
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There is no need to assign valuse to the states. Also add _INVALID and _MAX,
even though these are not used, it keeps it consistent.
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The actual code rename will follow. The reason for the change of name is to make it
simpler and more uniform with how we name other libraries (we don't include the
underlying protocol). The new name also matches the naming in the kernel (which
is particularly relevent here as we expect to let the kernel do some parts of
the protocol and we do others).
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