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Prefix all exported constants with SD_IPV4LL_* to avoid namespacing
conflicts.
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ipv4ll use an unsigned instead of an uint8_t array. Hence, use an
unsigned seed instead of declaring an array and then dereferencing it
later.
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This splits the Address Conflict Detection out of the Link Local
library so that we can reuse it for DHCP and static addresses in
the future.
Implements RFC5227.
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Firstly, no longer distinguish between STOP and INIT states.
Secondly, do not trigger STOP events when calls to sd_ipv4ll_*() fail. The
caller is the one who would receive the event and will already know that the
call to sd_ipv4ll_*() has failed, so it is redundant.
STOP events will now only be triggered by calling sd_ipv4ll_stop() explicitly
or by some internal error in the library triggered by receiving a packet or
an expiring timeout (i.e., any error that would otherwise not be reported
back to the consumer of the library).
Lastly, follow CODING_STYLE and always return NULL on unref. Protect from
objects being destroyed in callbacks accordingly.
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We currently process every ARP packet, but we should only care about the ones
relating to our IP address.
Also rename ipv4ll helpers to apr-utils.[ch], and rework the helpers a bit.
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Everywhere else we call the generic user data pointer just "userdata",
rather than "user_data". Let's do this here, too.
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shuts up valgrind/sanitizers
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- Also only allow positive ifindex on both dhcp and ipv4ll
[tomegun: the kernel always sets a positive ifindex, but some APIs accept
ifindex=0 with various meanings, so we should protect against
accidentally passing ifindex=0 along.]
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