dhcpcd: Update to Version 5.2.10

Change-Id: I949331c7aad91b125decd51da4041983d3a352bc
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

1 files changed, 156 insertions, 0 deletions

diff --git a/ipv4ll.c b/ipv4ll.c
new file mode 100644
index 0000000..4336540
--- /dev/null
+++ b/ipv4ll.c
@@ -0,0 +1,156 @@
+/* 
+ * dhcpcd - DHCP client daemon
+ * Copyright (c) 2006-2008 Roy Marples <roy@marples.name>
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+
+#include "arp.h"
+#include "common.h"
+#include "dhcpcd.h"
+#include "eloop.h"
+#include "if-options.h"
+#include "ipv4ll.h"
+#include "net.h"
+
+static struct dhcp_message *
+make_ipv4ll_lease(uint32_t addr)
+{
+	uint32_t u32;
+	struct dhcp_message *dhcp;
+	uint8_t *p;
+
+	dhcp = xzalloc(sizeof(*dhcp));
+	/* Put some LL options in */
+	dhcp->yiaddr = addr;
+	p = dhcp->options;
+	*p++ = DHO_SUBNETMASK;
+	*p++ = sizeof(u32);
+	u32 = htonl(LINKLOCAL_MASK);
+	memcpy(p, &u32, sizeof(u32));
+	p += sizeof(u32);
+	*p++ = DHO_BROADCAST;
+	*p++ = sizeof(u32);
+	u32 = htonl(LINKLOCAL_BRDC);
+	memcpy(p, &u32, sizeof(u32));
+	p += sizeof(u32);
+	*p++ = DHO_END;
+
+	return dhcp;
+}
+
+static struct dhcp_message *
+find_ipv4ll_lease(uint32_t old_addr)
+{
+	uint32_t addr;
+
+	for (;;) {
+		addr = htonl(LINKLOCAL_ADDR |
+		    (((uint32_t)abs((int)arc4random())
+			% 0xFD00) + 0x0100));
+		if (addr != old_addr &&
+		    IN_LINKLOCAL(ntohl(addr)))
+			break;
+	}
+	return make_ipv4ll_lease(addr);
+}
+
+void
+start_ipv4ll(void *arg)
+{
+	struct interface *iface = arg;
+	uint32_t addr;
+
+	delete_timeout(NULL, iface);
+	iface->state->probes = 0;
+	iface->state->claims = 0;
+	if (iface->addr.s_addr) {
+		iface->state->conflicts = 0;
+		if (IN_LINKLOCAL(htonl(iface->addr.s_addr))) {
+			send_arp_announce(iface);
+			return;
+		}
+	}
+
+	if (iface->state->offer == NULL)
+		addr = 0;
+	else {
+		addr = iface->state->offer->yiaddr;
+		free(iface->state->offer);
+	}
+	/* We maybe rebooting an IPv4LL address. */
+	if (!IN_LINKLOCAL(htonl(addr))) {
+		syslog(LOG_INFO, "%s: probing for an IPv4LL address",
+		    iface->name);
+		addr = 0;
+	}
+	if (addr == 0)
+		iface->state->offer = find_ipv4ll_lease(addr);
+	else
+		iface->state->offer = make_ipv4ll_lease(addr);
+	iface->state->lease.frominfo = 0;
+	send_arp_probe(iface);
+}
+
+void
+handle_ipv4ll_failure(void *arg)
+{
+	struct interface *iface = arg;
+	time_t up;
+
+	if (iface->state->fail.s_addr == iface->addr.s_addr) {
+		up = uptime();
+		if (iface->state->defend + DEFEND_INTERVAL > up) {
+			syslog(LOG_DEBUG,
+			    "%s: IPv4LL %d second defence failed",
+			    iface->name, DEFEND_INTERVAL);
+			drop_config(iface, "EXPIRE");
+			iface->state->conflicts = -1;
+		} else {
+			syslog(LOG_DEBUG, "%s: defended IPv4LL address",
+			    iface->name);
+			iface->state->defend = up;
+			return;
+		}
+	}
+
+	close_sockets(iface);
+	free(iface->state->offer);
+	iface->state->offer = NULL;
+	delete_timeout(NULL, iface);
+	if (++iface->state->conflicts > MAX_CONFLICTS) {
+		syslog(LOG_ERR, "%s: failed to acquire an IPv4LL address",
+		    iface->name);
+		iface->state->interval = RATE_LIMIT_INTERVAL / 2;
+		start_discover(iface);
+	} else {
+		add_timeout_sec(PROBE_WAIT, start_ipv4ll, iface);
+	}
+}