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Apply lastlease behavior to DHCPv6 (#384)

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If no response is received to Confirm messages, instead of failing, go
ahead and use the lease, as recommended by RFC 8415 18.2.3.
This commit is contained in:
Jon Franklin 2024-10-14 07:58:24 -05:00 committed by GitHub
parent c1d1a885ae
commit d97fe0281a
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3 changed files with 16 additions and 3 deletions
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4
hooks/dhcpcd-run-hooks.8.in
View File

@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd October 10, 2024
.Dd October 11, 2024
.Dt DHCPCD-RUN-HOOKS 8
.Os
.Sh NAME
@ -114,7 +114,7 @@ dhcpcd has been configured with a static configuration which has not been
obtained from a DHCP server.
.It Dv 3RDPARTY
dhcpcd is monitoring the interface for a 3rd party to give it an IP address.
.It Dv TIMEOUT
.It Dv TIMEOUT | TIMEOUT6
dhcpcd failed to contact any DHCP servers but was able to use an old lease.
.It Dv EXPIRE | EXPIRE6
dhcpcd's lease or state expired and it failed to obtain a new one.

2
src/dhcp6.c
View File

@ -1760,6 +1760,8 @@ dhcp6_fail(struct interface *ifp, bool drop)
dhcp_unlink(ifp->ctx, state->leasefile);
dhcp6_addrequestedaddrs(ifp);
eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp);
} else if (state->recv && ifp->options->options & DHCPCD_LASTLEASE) {
dhcp6_bind(ifp, NULL, NULL);
} else if (state->new) {
script_runreason(ifp, "TIMEOUT6");
// We need to keep the expire timeout alive

13
src/dhcpcd.conf.5.in
View File

@ -24,7 +24,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd May 24, 2024
.Dd October 11, 2024
.Dt DHCPCD.CONF 5
.Os
.Sh NAME
@ -471,6 +471,17 @@ always fork on a RA.
Enables IPv6 Router Advertisement solicitation.
This is on by default, but is documented here in the case where it is disabled
globally but needs to be enabled for one interface.
.It Ic lastlease
If
.Nm dhcpcd
cannot obtain a lease, then try to use the last lease acquired for the
interface.
.It Ic lastleaseextend
Same as the above, but the lease will be retained even if it expires.
.Nm dhcpcd
will give it up if any other host tries to claim it for their own via ARP.
This violates RFC 2131, section 3.7, which states the lease should be
dropped once it has expired.
.It Ic leasetime Ar seconds
Request DHCP a lease time of
.Ar seconds .