All over the place we define local variables for the various sockopts
that take a bool-like "int" value. Sometimes they are const, sometimes
static, sometimes both, sometimes neither.
Let's clean this up, introduce a common const variable "const_int_one"
(as well as one matching "const_int_zero") and use it everywhere, all
acorss the codebase.
The code handling the errors was originally part of ndisc_recv, which,
being an event handler, would be simply turned off if it returned a negative
error code. It's no longer necessary. Plus, it helps avoid passing
an uninitialized value to radv_send.
Closes https://github.com/systemd/systemd/issues/10223.
This part of the copyright blurb stems from the GPL use recommendations:
https://www.gnu.org/licenses/gpl-howto.en.html
The concept appears to originate in times where version control was per
file, instead of per tree, and was a way to glue the files together.
Ultimately, we nowadays don't live in that world anymore, and this
information is entirely useless anyway, as people are very welcome to
copy these files into any projects they like, and they shouldn't have to
change bits that are part of our copyright header for that.
hence, let's just get rid of this old cruft, and shorten our codebase a
bit.
Files which are installed as-is (any .service and other unit files, .conf
files, .policy files, etc), are left as is. My assumption is that SPDX
identifiers are not yet that well known, so it's better to retain the
extended header to avoid any doubt.
I also kept any copyright lines. We can probably remove them, but it'd nice to
obtain explicit acks from all involved authors before doing that.
This is similar to TAKE_PTR() but operates on file descriptors, and thus
assigns -1 to the fd parameter after returning it.
Removes 60 lines from our codebase. Pretty good too I think.
Receive Router Solicitations and send a unicast Router Advertisment
in response. Refactor ICMPv6 packet handling code so that the common
ICMPv6 validation parts are reused between the existing router
discovery and the new functionality adding reception of Router
Solicitation messages.
Reuse and refactor the functionality already present for Router
Solicitations in order to create a socket for sending Router
Advertisements. Anticipate reception of incoming Router
Solicitations by setting the ICMPv6 filter accordingly. Also set
the unicast hop limit to 255 for ICMPv6 sockets as unicast Router
Advertisments are to be sent in response to Router Solicitations.
Update the Router Solicitation test case code with a function
definition in order to keep the test case working.
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
From the issue #2004 we are receiving packet even if this
packet is not intended for this interface.
This can be reproduced.
lp3s0: Updating address: 2001:db8:1:0:7e7a:91ff:fe6d:ffe2/64 (valid for 1d)
wlp3s0: Updating address: fe80::7e7a:91ff:fe6d:ffe2/64 (valid forever)
NDisc CLIENT: Received RA from non-link-local address ::. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 2 != 6. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 2 != 3. Ignoring.
enp0s25: Updating address: 2001:db8:1:0:2ad2:44ff:fe6a:ae07/64 (valid for 1d)
enp0s25: Updating address: fe80::2ad2:44ff:fe6a:ae07/64 (valid forever)
NDisc CLIENT: Sent Router Solicitation
NDisc CLIENT: Sent Router Solicitation
NDisc CLIENT: Sent Router Solicitation
NDisc CLIENT: Received RA on wrong interface: 3 != 2. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 3 != 6. Ignoring.
NDisc CLIENT: Received RA from non-link-local address ::. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 2 != 6. Ignoring.
NDisc CLIENT: Received RA on wrong interface: 2 != 3. Ignoring.
enp0s25: Updating address: 2001:db8:1:0:2ad2:44ff:fe6a:ae07/64 (valid for 1d)
enp0s25: Updating address: fe80::2ad2:44ff:fe6a:ae07/64 (valid forever)
Add SO_BINDTODEVICE to socket
fixes#2004
