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https://github.com/rsmarples/dhcpcd.git
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449df9c859
RA expiry timers now trigger off options as well Stop prefixing new_ for RA options if_up and if_down are now set by dhcpcd itself Correctly prefer a DHCP lease over an IPv4LL entry
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
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* dhcpcd - DHCP client daemon
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* Copyright (c) 2006-2012 Roy Marples <roy@marples.name>
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* All rights reserved
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include "config.h"
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#include "dhcpcd.h"
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#include "if-pref.h"
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#include "net.h"
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/* Interface comparer for working out ordering. */
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static int
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ifcmp(struct interface *si, struct interface *ti)
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{
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int sill, till;
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if (si->state && !ti->state)
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return -1;
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if (!si->state && ti->state)
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return 1;
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if (!si->state && !ti->state)
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return 0;
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/* If one has a lease and the other not, it takes precedence. */
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if (si->state->new && !ti->state->new)
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return -1;
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if (!si->state->new && ti->state->new)
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return 1;
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/* If we are either, they neither have a lease, or they both have.
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* We need to check for IPv4LL and make it non-preferred. */
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if (si->state->new && ti->state->new) {
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sill = (si->state->new->cookie == htonl(MAGIC_COOKIE));
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till = (ti->state->new->cookie == htonl(MAGIC_COOKIE));
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if (!sill && till)
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return 1;
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if (sill && !till)
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return -1;
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}
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/* Then carrier status. */
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if (si->carrier > ti->carrier)
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return -1;
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if (si->carrier < ti->carrier)
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return 1;
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/* Finally, metric */
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if (si->metric < ti->metric)
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return -1;
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if (si->metric > ti->metric)
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return 1;
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return 0;
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}
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/* Sort the interfaces into a preferred order - best first, worst last. */
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void
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sort_interfaces(void)
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{
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struct interface *sorted, *ifp, *ifn, *ift;
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if (!ifaces || !ifaces->next)
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return;
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sorted = ifaces;
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ifaces = ifaces->next;
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sorted->next = NULL;
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for (ifp = ifaces; ifp && (ifn = ifp->next, 1); ifp = ifn) {
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/* Are we the new head? */
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if (ifcmp(ifp, sorted) == -1) {
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ifp->next = sorted;
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sorted = ifp;
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continue;
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}
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/* Do we fit in the middle? */
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for (ift = sorted; ift->next; ift = ift->next) {
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if (ifcmp(ifp, ift->next) == -1) {
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ifp->next = ift->next;
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ift->next = ifp;
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break;
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}
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}
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/* We must be at the end */
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if (!ift->next) {
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ift->next = ifp;
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ifp->next = NULL;
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}
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}
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ifaces = sorted;
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}
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